You've already forked android_translation_layer
mirror of
https://gitlab.com/android_translation_layer/android_translation_layer.git
synced 2025-10-27 11:48:10 -07:00
6192 lines
180 KiB
Java
6192 lines
180 KiB
Java
/*
|
|
* Copyright (C) 2006 The Android Open Source Project
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
package android.widget;
|
|
|
|
import java.util.ArrayList;
|
|
import java.util.List;
|
|
|
|
import com.android.internal.R;
|
|
|
|
import android.content.Context;
|
|
import android.content.res.TypedArray;
|
|
import android.graphics.Canvas;
|
|
import android.graphics.Rect;
|
|
import android.graphics.drawable.Drawable;
|
|
import android.graphics.drawable.TransitionDrawable;
|
|
import android.os.Trace;
|
|
import android.text.Editable;
|
|
import android.text.TextUtils;
|
|
import android.text.TextWatcher;
|
|
import android.util.AttributeSet;
|
|
import android.util.Log;
|
|
import android.util.LongSparseArray;
|
|
import android.util.SparseArray;
|
|
import android.util.SparseBooleanArray;
|
|
import android.util.StateSet;
|
|
import android.view.ActionMode;
|
|
import android.view.Gravity;
|
|
import android.view.InputDevice;
|
|
import android.view.KeyEvent;
|
|
import android.view.Menu;
|
|
import android.view.MenuItem;
|
|
import android.view.MotionEvent;
|
|
import android.view.VelocityTracker;
|
|
import android.view.View;
|
|
import android.view.ViewConfiguration;
|
|
import android.view.ViewGroup;
|
|
import android.view.ViewParent;
|
|
import android.view.ViewTreeObserver;
|
|
import android.view.animation.Interpolator;
|
|
import android.view.animation.LinearInterpolator;
|
|
|
|
/**
|
|
* Base class that can be used to implement virtualized lists of items. A list does
|
|
* not have a spatial definition here. For instance, subclases of this class can
|
|
* display the content of the list in a grid, in a carousel, as stack, etc.
|
|
*
|
|
* @attr ref android.R.styleable#AbsListView_listSelector
|
|
* @attr ref android.R.styleable#AbsListView_drawSelectorOnTop
|
|
* @attr ref android.R.styleable#AbsListView_stackFromBottom
|
|
* @attr ref android.R.styleable#AbsListView_scrollingCache
|
|
* @attr ref android.R.styleable#AbsListView_textFilterEnabled
|
|
* @attr ref android.R.styleable#AbsListView_transcriptMode
|
|
* @attr ref android.R.styleable#AbsListView_cacheColorHint
|
|
* @attr ref android.R.styleable#AbsListView_fastScrollEnabled
|
|
* @attr ref android.R.styleable#AbsListView_smoothScrollbar
|
|
* @attr ref android.R.styleable#AbsListView_choiceMode
|
|
*/
|
|
public abstract class AbsListView extends AdapterView<ListAdapter> implements TextWatcher,
|
|
ViewTreeObserver.OnGlobalLayoutListener, Filter.FilterListener,
|
|
ViewTreeObserver.OnTouchModeChangeListener {
|
|
|
|
@SuppressWarnings("UnusedDeclaration")
|
|
private static final String TAG = "AbsListView";
|
|
|
|
/**
|
|
* Disables the transcript mode.
|
|
*
|
|
* @see #setTranscriptMode(int)
|
|
*/
|
|
public static final int TRANSCRIPT_MODE_DISABLED = 0;
|
|
|
|
/**
|
|
* The list will automatically scroll to the bottom when a data set change
|
|
* notification is received and only if the last item is already visible
|
|
* on screen.
|
|
*
|
|
* @see #setTranscriptMode(int)
|
|
*/
|
|
public static final int TRANSCRIPT_MODE_NORMAL = 1;
|
|
|
|
/**
|
|
* The list will automatically scroll to the bottom, no matter what items
|
|
* are currently visible.
|
|
*
|
|
* @see #setTranscriptMode(int)
|
|
*/
|
|
public static final int TRANSCRIPT_MODE_ALWAYS_SCROLL = 2;
|
|
|
|
/**
|
|
* Indicates that we are not in the middle of a touch gesture
|
|
*/
|
|
static final int TOUCH_MODE_REST = -1;
|
|
|
|
/**
|
|
* Indicates we just received the touch event and we are waiting to see if the it is a tap or a
|
|
* scroll gesture.
|
|
*/
|
|
static final int TOUCH_MODE_DOWN = 0;
|
|
|
|
/**
|
|
* Indicates the touch has been recognized as a tap and we are now waiting to see if the touch
|
|
* is a longpress
|
|
*/
|
|
static final int TOUCH_MODE_TAP = 1;
|
|
|
|
/**
|
|
* Indicates we have waited for everything we can wait for, but the user's finger is still down
|
|
*/
|
|
static final int TOUCH_MODE_DONE_WAITING = 2;
|
|
|
|
/**
|
|
* Indicates the touch gesture is a scroll
|
|
*/
|
|
static final int TOUCH_MODE_SCROLL = 3;
|
|
|
|
/**
|
|
* Indicates the view is in the process of being flung
|
|
*/
|
|
static final int TOUCH_MODE_FLING = 4;
|
|
|
|
/**
|
|
* Indicates the touch gesture is an overscroll - a scroll beyond the beginning or end.
|
|
*/
|
|
static final int TOUCH_MODE_OVERSCROLL = 5;
|
|
|
|
/**
|
|
* Indicates the view is being flung outside of normal content bounds
|
|
* and will spring back.
|
|
*/
|
|
static final int TOUCH_MODE_OVERFLING = 6;
|
|
|
|
/**
|
|
* Regular layout - usually an unsolicited layout from the view system
|
|
*/
|
|
static final int LAYOUT_NORMAL = 0;
|
|
|
|
/**
|
|
* Show the first item
|
|
*/
|
|
static final int LAYOUT_FORCE_TOP = 1;
|
|
|
|
/**
|
|
* Force the selected item to be on somewhere on the screen
|
|
*/
|
|
static final int LAYOUT_SET_SELECTION = 2;
|
|
|
|
/**
|
|
* Show the last item
|
|
*/
|
|
static final int LAYOUT_FORCE_BOTTOM = 3;
|
|
|
|
/**
|
|
* Make a mSelectedItem appear in a specific location and build the rest of
|
|
* the views from there. The top is specified by mSpecificTop.
|
|
*/
|
|
static final int LAYOUT_SPECIFIC = 4;
|
|
|
|
/**
|
|
* Layout to sync as a result of a data change. Restore mSyncPosition to have its top
|
|
* at mSpecificTop
|
|
*/
|
|
static final int LAYOUT_SYNC = 5;
|
|
|
|
/**
|
|
* Layout as a result of using the navigation keys
|
|
*/
|
|
static final int LAYOUT_MOVE_SELECTION = 6;
|
|
|
|
/**
|
|
* Normal list that does not indicate choices
|
|
*/
|
|
public static final int CHOICE_MODE_NONE = 0;
|
|
|
|
/**
|
|
* The list allows up to one choice
|
|
*/
|
|
public static final int CHOICE_MODE_SINGLE = 1;
|
|
|
|
/**
|
|
* The list allows multiple choices
|
|
*/
|
|
public static final int CHOICE_MODE_MULTIPLE = 2;
|
|
|
|
/**
|
|
* The list allows multiple choices in a modal selection mode
|
|
*/
|
|
public static final int CHOICE_MODE_MULTIPLE_MODAL = 3;
|
|
|
|
/**
|
|
* The thread that created this view.
|
|
*/
|
|
private final Thread mOwnerThread;
|
|
|
|
/**
|
|
* Controls if/how the user may choose/check items in the list
|
|
*/
|
|
int mChoiceMode = CHOICE_MODE_NONE;
|
|
|
|
/**
|
|
* Controls CHOICE_MODE_MULTIPLE_MODAL. null when inactive.
|
|
*/
|
|
ActionMode mChoiceActionMode;
|
|
|
|
/**
|
|
* Wrapper for the multiple choice mode callback; AbsListView needs to perform
|
|
* a few extra actions around what application code does.
|
|
*/
|
|
MultiChoiceModeWrapper mMultiChoiceModeCallback;
|
|
|
|
/**
|
|
* Running count of how many items are currently checked
|
|
*/
|
|
int mCheckedItemCount;
|
|
|
|
/**
|
|
* Running state of which positions are currently checked
|
|
*/
|
|
SparseBooleanArray mCheckStates;
|
|
|
|
/**
|
|
* Running state of which IDs are currently checked.
|
|
* If there is a value for a given key, the checked state for that ID is true
|
|
* and the value holds the last known position in the adapter for that id.
|
|
*/
|
|
LongSparseArray<Integer> mCheckedIdStates;
|
|
|
|
/**
|
|
* Controls how the next layout will happen
|
|
*/
|
|
int mLayoutMode = LAYOUT_NORMAL;
|
|
|
|
/**
|
|
* Should be used by subclasses to listen to changes in the dataset
|
|
*/
|
|
AdapterDataSetObserver mDataSetObserver;
|
|
|
|
/**
|
|
* The adapter containing the data to be displayed by this view
|
|
*/
|
|
ListAdapter mAdapter;
|
|
|
|
/**
|
|
* If mAdapter != null, whenever this is true the adapter has stable IDs.
|
|
*/
|
|
boolean mAdapterHasStableIds;
|
|
|
|
/**
|
|
* Indicates whether the list selector should be drawn on top of the children or behind
|
|
*/
|
|
boolean mDrawSelectorOnTop = false;
|
|
|
|
/**
|
|
* The drawable used to draw the selector
|
|
*/
|
|
Drawable mSelector;
|
|
|
|
/**
|
|
* The current position of the selector in the list.
|
|
*/
|
|
int mSelectorPosition = INVALID_POSITION;
|
|
|
|
/**
|
|
* Defines the selector's location and dimension at drawing time
|
|
*/
|
|
Rect mSelectorRect = new Rect();
|
|
|
|
/**
|
|
* The data set used to store unused views that should be reused during the next layout
|
|
* to avoid creating new ones
|
|
*/
|
|
final RecycleBin mRecycler = new RecycleBin();
|
|
|
|
/**
|
|
* The selection's left padding
|
|
*/
|
|
int mSelectionLeftPadding = 0;
|
|
|
|
/**
|
|
* The selection's top padding
|
|
*/
|
|
int mSelectionTopPadding = 0;
|
|
|
|
/**
|
|
* The selection's right padding
|
|
*/
|
|
int mSelectionRightPadding = 0;
|
|
|
|
/**
|
|
* The selection's bottom padding
|
|
*/
|
|
int mSelectionBottomPadding = 0;
|
|
|
|
/**
|
|
* This view's padding
|
|
*/
|
|
Rect mListPadding = new Rect();
|
|
|
|
/**
|
|
* Subclasses must retain their measure spec from onMeasure() into this member
|
|
*/
|
|
int mWidthMeasureSpec = 0;
|
|
|
|
/**
|
|
* The top scroll indicator
|
|
*/
|
|
View mScrollUp;
|
|
|
|
/**
|
|
* The down scroll indicator
|
|
*/
|
|
View mScrollDown;
|
|
|
|
/**
|
|
* When the view is scrolling, this flag is set to true to indicate subclasses that
|
|
* the drawing cache was enabled on the children
|
|
*/
|
|
boolean mCachingStarted;
|
|
boolean mCachingActive;
|
|
|
|
/**
|
|
* The position of the view that received the down motion event
|
|
*/
|
|
int mMotionPosition;
|
|
|
|
/**
|
|
* The offset to the top of the mMotionPosition view when the down motion event was received
|
|
*/
|
|
int mMotionViewOriginalTop;
|
|
|
|
/**
|
|
* The desired offset to the top of the mMotionPosition view after a scroll
|
|
*/
|
|
int mMotionViewNewTop;
|
|
|
|
/**
|
|
* The X value associated with the the down motion event
|
|
*/
|
|
int mMotionX;
|
|
|
|
/**
|
|
* The Y value associated with the the down motion event
|
|
*/
|
|
int mMotionY;
|
|
|
|
/**
|
|
* One of TOUCH_MODE_REST, TOUCH_MODE_DOWN, TOUCH_MODE_TAP, TOUCH_MODE_SCROLL, or
|
|
* TOUCH_MODE_DONE_WAITING
|
|
*/
|
|
int mTouchMode = TOUCH_MODE_REST;
|
|
|
|
/**
|
|
* Y value from on the previous motion event (if any)
|
|
*/
|
|
int mLastY;
|
|
|
|
/**
|
|
* How far the finger moved before we started scrolling
|
|
*/
|
|
int mMotionCorrection;
|
|
|
|
/**
|
|
* Determines speed during touch scrolling
|
|
*/
|
|
private VelocityTracker mVelocityTracker;
|
|
|
|
/**
|
|
* Handles one frame of a fling
|
|
*/
|
|
private FlingRunnable mFlingRunnable;
|
|
|
|
/**
|
|
* Handles scrolling between positions within the list.
|
|
*/
|
|
AbsPositionScroller mPositionScroller;
|
|
|
|
/**
|
|
* The offset in pixels form the top of the AdapterView to the top
|
|
* of the currently selected view. Used to save and restore state.
|
|
*/
|
|
int mSelectedTop = 0;
|
|
|
|
/**
|
|
* Indicates whether the list is stacked from the bottom edge or
|
|
* the top edge.
|
|
*/
|
|
boolean mStackFromBottom;
|
|
|
|
/**
|
|
* When set to true, the list automatically discards the children's
|
|
* bitmap cache after scrolling.
|
|
*/
|
|
boolean mScrollingCacheEnabled;
|
|
|
|
/**
|
|
* Whether or not to enable the fast scroll feature on this list
|
|
*/
|
|
boolean mFastScrollEnabled;
|
|
|
|
/**
|
|
* Whether or not to always show the fast scroll feature on this list
|
|
*/
|
|
boolean mFastScrollAlwaysVisible;
|
|
|
|
/**
|
|
* Optional callback to notify client when scroll position has changed
|
|
*/
|
|
private OnScrollListener mOnScrollListener;
|
|
|
|
/**
|
|
* Keeps track of our accessory window
|
|
*/
|
|
PopupWindow mPopup;
|
|
|
|
/**
|
|
* Used with type filter window
|
|
*/
|
|
EditText mTextFilter;
|
|
|
|
/**
|
|
* Indicates whether to use pixels-based or position-based scrollbar
|
|
* properties.
|
|
*/
|
|
private boolean mSmoothScrollbarEnabled = true;
|
|
|
|
/**
|
|
* Indicates that this view supports filtering
|
|
*/
|
|
private boolean mTextFilterEnabled;
|
|
|
|
/**
|
|
* Indicates that this view is currently displaying a filtered view of the data
|
|
*/
|
|
private boolean mFiltered;
|
|
|
|
/**
|
|
* Rectangle used for hit testing children
|
|
*/
|
|
private Rect mTouchFrame;
|
|
|
|
/**
|
|
* The position to resurrect the selected position to.
|
|
*/
|
|
int mResurrectToPosition = INVALID_POSITION;
|
|
|
|
/**
|
|
* Maximum distance to record overscroll
|
|
*/
|
|
int mOverscrollMax;
|
|
|
|
/**
|
|
* Content height divided by this is the overscroll limit.
|
|
*/
|
|
static final int OVERSCROLL_LIMIT_DIVISOR = 3;
|
|
|
|
/**
|
|
* How many positions in either direction we will search to try to
|
|
* find a checked item with a stable ID that moved position across
|
|
* a data set change. If the item isn't found it will be unselected.
|
|
*/
|
|
private static final int CHECK_POSITION_SEARCH_DISTANCE = 20;
|
|
|
|
private static final boolean PROFILE_SCROLLING = false;
|
|
private boolean mScrollProfilingStarted = false;
|
|
|
|
private static final boolean PROFILE_FLINGING = false;
|
|
private boolean mFlingProfilingStarted = false;
|
|
|
|
/**
|
|
* The last CheckForLongPress runnable we posted, if any
|
|
*/
|
|
private CheckForLongPress mPendingCheckForLongPress;
|
|
|
|
/**
|
|
* The last CheckForTap runnable we posted, if any
|
|
*/
|
|
private CheckForTap mPendingCheckForTap;
|
|
|
|
/**
|
|
* The last CheckForKeyLongPress runnable we posted, if any
|
|
*/
|
|
private CheckForKeyLongPress mPendingCheckForKeyLongPress;
|
|
|
|
/**
|
|
* Acts upon click
|
|
*/
|
|
private AbsListView.PerformClick mPerformClick;
|
|
|
|
/**
|
|
* Delayed action for touch mode.
|
|
*/
|
|
private Runnable mTouchModeReset;
|
|
|
|
/**
|
|
* This view is in transcript mode -- it shows the bottom of the list when the data
|
|
* changes
|
|
*/
|
|
private int mTranscriptMode;
|
|
|
|
/**
|
|
* Indicates that this list is always drawn on top of a solid, single-color, opaque
|
|
* background
|
|
*/
|
|
private int mCacheColorHint;
|
|
|
|
/**
|
|
* The select child's view (from the adapter's getView) is enabled.
|
|
*/
|
|
private boolean mIsChildViewEnabled;
|
|
|
|
/**
|
|
* The last scroll state reported to clients through {@link OnScrollListener}.
|
|
*/
|
|
private int mLastScrollState = OnScrollListener.SCROLL_STATE_IDLE;
|
|
|
|
/**
|
|
* Helper object that renders and controls the fast scroll thumb.
|
|
*/
|
|
// private FastScroller mFastScroll;
|
|
|
|
private boolean mGlobalLayoutListenerAddedFilter;
|
|
|
|
private int mTouchSlop;
|
|
private float mDensityScale;
|
|
|
|
private Runnable mClearScrollingCache;
|
|
Runnable mPositionScrollAfterLayout;
|
|
private int mMinimumVelocity;
|
|
private int mMaximumVelocity;
|
|
private float mVelocityScale = 1.0f;
|
|
|
|
final boolean[] mIsScrap = new boolean[1];
|
|
|
|
// Used for offsetting MotionEvents that we feed to the VelocityTracker.
|
|
// In the future it would be nice to be able to give this to the VelocityTracker
|
|
// directly, or alternatively put a VT into absolute-positioning mode that only
|
|
// reads the raw screen-coordinate x/y values.
|
|
private int mNestedYOffset = 0;
|
|
|
|
// True when the popup should be hidden because of a call to
|
|
// dispatchDisplayHint()
|
|
private boolean mPopupHidden;
|
|
|
|
/**
|
|
* ID of the active pointer. This is used to retain consistency during
|
|
* drags/flings if multiple pointers are used.
|
|
*/
|
|
private int mActivePointerId = INVALID_POINTER;
|
|
|
|
/**
|
|
* Sentinel value for no current active pointer.
|
|
* Used by {@link #mActivePointerId}.
|
|
*/
|
|
private static final int INVALID_POINTER = -1;
|
|
|
|
/**
|
|
* Maximum distance to overscroll by during edge effects
|
|
*/
|
|
int mOverscrollDistance;
|
|
|
|
/**
|
|
* Maximum distance to overfling during edge effects
|
|
*/
|
|
int mOverflingDistance;
|
|
|
|
// These two EdgeGlows are always set and used together.
|
|
// Checking one for null is as good as checking both.
|
|
|
|
/**
|
|
* Tracks the state of the top edge glow.
|
|
*/
|
|
private EdgeEffect mEdgeGlowTop;
|
|
|
|
/**
|
|
* Tracks the state of the bottom edge glow.
|
|
*/
|
|
private EdgeEffect mEdgeGlowBottom;
|
|
|
|
/**
|
|
* Used for determining when to cancel out of overscroll.
|
|
*/
|
|
private int mDirection = 0;
|
|
|
|
/**
|
|
* Tracked on measurement in transcript mode. Makes sure that we can still pin to
|
|
* the bottom correctly on resizes.
|
|
*/
|
|
private boolean mForceTranscriptScroll;
|
|
|
|
/**
|
|
* Track the item count from the last time we handled a data change.
|
|
*/
|
|
private int mLastHandledItemCount;
|
|
|
|
/**
|
|
* Used for smooth scrolling at a consistent rate
|
|
*/
|
|
static final Interpolator sLinearInterpolator = new LinearInterpolator();
|
|
|
|
/**
|
|
* Whether the view is in the process of detaching from its window.
|
|
*/
|
|
private boolean mIsDetaching;
|
|
|
|
/**
|
|
* Interface definition for a callback to be invoked when the list or grid
|
|
* has been scrolled.
|
|
*/
|
|
public interface OnScrollListener {
|
|
|
|
/**
|
|
* The view is not scrolling. Note navigating the list using the trackball counts as
|
|
* being in the idle state since these transitions are not animated.
|
|
*/
|
|
public static int SCROLL_STATE_IDLE = 0;
|
|
|
|
/**
|
|
* The user is scrolling using touch, and their finger is still on the screen
|
|
*/
|
|
public static int SCROLL_STATE_TOUCH_SCROLL = 1;
|
|
|
|
/**
|
|
* The user had previously been scrolling using touch and had performed a fling. The
|
|
* animation is now coasting to a stop
|
|
*/
|
|
public static int SCROLL_STATE_FLING = 2;
|
|
|
|
/**
|
|
* Callback method to be invoked while the list view or grid view is being scrolled. If the
|
|
* view is being scrolled, this method will be called before the next frame of the scroll is
|
|
* rendered. In particular, it will be called before any calls to
|
|
* {@link Adapter#getView(int, View, ViewGroup)}.
|
|
*
|
|
* @param view The view whose scroll state is being reported
|
|
*
|
|
* @param scrollState The current scroll state. One of
|
|
* {@link #SCROLL_STATE_TOUCH_SCROLL} or {@link #SCROLL_STATE_IDLE}.
|
|
*/
|
|
public void onScrollStateChanged(AbsListView view, int scrollState);
|
|
|
|
/**
|
|
* Callback method to be invoked when the list or grid has been scrolled. This will be
|
|
* called after the scroll has completed
|
|
* @param view The view whose scroll state is being reported
|
|
* @param firstVisibleItem the index of the first visible cell (ignore if
|
|
* visibleItemCount == 0)
|
|
* @param visibleItemCount the number of visible cells
|
|
* @param totalItemCount the number of items in the list adaptor
|
|
*/
|
|
public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount,
|
|
int totalItemCount);
|
|
}
|
|
|
|
/**
|
|
* The top-level view of a list item can implement this interface to allow
|
|
* itself to modify the bounds of the selection shown for that item.
|
|
*/
|
|
public interface SelectionBoundsAdjuster {
|
|
/**
|
|
* Called to allow the list item to adjust the bounds shown for
|
|
* its selection.
|
|
*
|
|
* @param bounds On call, this contains the bounds the list has
|
|
* selected for the item (that is the bounds of the entire view). The
|
|
* values can be modified as desired.
|
|
*/
|
|
public void adjustListItemSelectionBounds(Rect bounds);
|
|
}
|
|
|
|
public AbsListView(Context context) {
|
|
super(context);
|
|
initAbsListView();
|
|
|
|
mOwnerThread = Thread.currentThread();
|
|
|
|
// setVerticalScrollBarEnabled(true);
|
|
// TypedArray a = context.obtainStyledAttributes(R.styleable.View);
|
|
// initializeScrollbarsInternal(a);
|
|
// a.recycle();
|
|
}
|
|
|
|
public AbsListView(Context context, AttributeSet attrs) {
|
|
this(context, attrs, com.android.internal.R.attr.absListViewStyle);
|
|
}
|
|
|
|
public AbsListView(Context context, AttributeSet attrs, int defStyleAttr) {
|
|
this(context, attrs, defStyleAttr, 0);
|
|
}
|
|
|
|
public AbsListView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
|
|
super(context, attrs, defStyleAttr, defStyleRes);
|
|
initAbsListView();
|
|
|
|
mOwnerThread = Thread.currentThread();
|
|
|
|
final TypedArray a = context.obtainStyledAttributes(
|
|
attrs, R.styleable.AbsListView, defStyleAttr, defStyleRes);
|
|
|
|
final Drawable selector = a.getDrawable(R.styleable.AbsListView_listSelector);
|
|
if (selector != null) {
|
|
setSelector(selector);
|
|
}
|
|
|
|
mDrawSelectorOnTop = a.getBoolean(R.styleable.AbsListView_drawSelectorOnTop, false);
|
|
|
|
setStackFromBottom(a.getBoolean(
|
|
R.styleable.AbsListView_stackFromBottom, false));
|
|
setScrollingCacheEnabled(a.getBoolean(
|
|
R.styleable.AbsListView_scrollingCache, true));
|
|
setTextFilterEnabled(a.getBoolean(
|
|
R.styleable.AbsListView_textFilterEnabled, false));
|
|
setTranscriptMode(a.getInt(
|
|
R.styleable.AbsListView_transcriptMode, TRANSCRIPT_MODE_DISABLED));
|
|
setCacheColorHint(a.getColor(
|
|
R.styleable.AbsListView_cacheColorHint, 0));
|
|
setSmoothScrollbarEnabled(a.getBoolean(
|
|
R.styleable.AbsListView_smoothScrollbar, true));
|
|
setChoiceMode(a.getInt(
|
|
R.styleable.AbsListView_choiceMode, CHOICE_MODE_NONE));
|
|
|
|
setFastScrollEnabled(a.getBoolean(
|
|
R.styleable.AbsListView_fastScrollEnabled, false));
|
|
setFastScrollStyle(a.getResourceId(
|
|
R.styleable.AbsListView_fastScrollStyle, 0));
|
|
setFastScrollAlwaysVisible(a.getBoolean(
|
|
R.styleable.AbsListView_fastScrollAlwaysVisible, false));
|
|
|
|
a.recycle();
|
|
}
|
|
|
|
private void initAbsListView() {
|
|
// Setting focusable in touch mode will set the focusable property to true
|
|
setClickable(true);
|
|
setFocusableInTouchMode(true);
|
|
setWillNotDraw(false);
|
|
// setAlwaysDrawnWithCacheEnabled(false);
|
|
setScrollingCacheEnabled(true);
|
|
|
|
final ViewConfiguration configuration = ViewConfiguration.get(getContext());
|
|
mTouchSlop = configuration.getScaledTouchSlop();
|
|
mMinimumVelocity = configuration.getScaledMinimumFlingVelocity();
|
|
mMaximumVelocity = configuration.getScaledMaximumFlingVelocity();
|
|
mOverscrollDistance = 10; // configuration.getScaledOverscrollDistance();
|
|
mOverflingDistance = 10; // configuration.getScaledOverflingDistance();
|
|
|
|
mDensityScale = getContext().getResources().getDisplayMetrics().density;
|
|
}
|
|
|
|
@Override
|
|
public void setOverScrollMode(int mode) {
|
|
if (mode != /*OVER_SCROLL_NEVER*/ 2) {
|
|
if (mEdgeGlowTop == null) {
|
|
Context context = getContext();
|
|
mEdgeGlowTop = new EdgeEffect(context);
|
|
mEdgeGlowBottom = new EdgeEffect(context);
|
|
}
|
|
} else {
|
|
mEdgeGlowTop = null;
|
|
mEdgeGlowBottom = null;
|
|
}
|
|
super.setOverScrollMode(mode);
|
|
}
|
|
|
|
/**
|
|
* {@inheritDoc}
|
|
*/
|
|
@Override
|
|
public void setAdapter(ListAdapter adapter) {
|
|
if (adapter != null) {
|
|
mAdapterHasStableIds = mAdapter.hasStableIds();
|
|
if (mChoiceMode != CHOICE_MODE_NONE && mAdapterHasStableIds &&
|
|
mCheckedIdStates == null) {
|
|
mCheckedIdStates = new LongSparseArray<Integer>();
|
|
}
|
|
}
|
|
|
|
if (mCheckStates != null) {
|
|
mCheckStates.clear();
|
|
}
|
|
|
|
if (mCheckedIdStates != null) {
|
|
mCheckedIdStates.clear();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Returns the number of items currently selected. This will only be valid
|
|
* if the choice mode is not {@link #CHOICE_MODE_NONE} (default).
|
|
*
|
|
* <p>To determine the specific items that are currently selected, use one of
|
|
* the <code>getChecked*</code> methods.
|
|
*
|
|
* @return The number of items currently selected
|
|
*
|
|
* @see #getCheckedItemPosition()
|
|
* @see #getCheckedItemPositions()
|
|
* @see #getCheckedItemIds()
|
|
*/
|
|
public int getCheckedItemCount() {
|
|
return mCheckedItemCount;
|
|
}
|
|
|
|
/**
|
|
* Returns the checked state of the specified position. The result is only
|
|
* valid if the choice mode has been set to {@link #CHOICE_MODE_SINGLE}
|
|
* or {@link #CHOICE_MODE_MULTIPLE}.
|
|
*
|
|
* @param position The item whose checked state to return
|
|
* @return The item's checked state or <code>false</code> if choice mode
|
|
* is invalid
|
|
*
|
|
* @see #setChoiceMode(int)
|
|
*/
|
|
public boolean isItemChecked(int position) {
|
|
if (mChoiceMode != CHOICE_MODE_NONE && mCheckStates != null) {
|
|
return mCheckStates.get(position);
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Returns the currently checked item. The result is only valid if the choice
|
|
* mode has been set to {@link #CHOICE_MODE_SINGLE}.
|
|
*
|
|
* @return The position of the currently checked item or
|
|
* {@link #INVALID_POSITION} if nothing is selected
|
|
*
|
|
* @see #setChoiceMode(int)
|
|
*/
|
|
public int getCheckedItemPosition() {
|
|
if (mChoiceMode == CHOICE_MODE_SINGLE && mCheckStates != null && mCheckStates.size() == 1) {
|
|
return mCheckStates.keyAt(0);
|
|
}
|
|
|
|
return INVALID_POSITION;
|
|
}
|
|
|
|
/**
|
|
* Returns the set of checked items in the list. The result is only valid if
|
|
* the choice mode has not been set to {@link #CHOICE_MODE_NONE}.
|
|
*
|
|
* @return A SparseBooleanArray which will return true for each call to
|
|
* get(int position) where position is a checked position in the
|
|
* list and false otherwise, or <code>null</code> if the choice
|
|
* mode is set to {@link #CHOICE_MODE_NONE}.
|
|
*/
|
|
public SparseBooleanArray getCheckedItemPositions() {
|
|
if (mChoiceMode != CHOICE_MODE_NONE) {
|
|
return mCheckStates;
|
|
}
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* Returns the set of checked items ids. The result is only valid if the
|
|
* choice mode has not been set to {@link #CHOICE_MODE_NONE} and the adapter
|
|
* has stable IDs. ({@link ListAdapter#hasStableIds()} == {@code true})
|
|
*
|
|
* @return A new array which contains the id of each checked item in the
|
|
* list.
|
|
*/
|
|
public long[] getCheckedItemIds() {
|
|
if (mChoiceMode == CHOICE_MODE_NONE || mCheckedIdStates == null || mAdapter == null) {
|
|
return new long[0];
|
|
}
|
|
|
|
final LongSparseArray<Integer> idStates = mCheckedIdStates;
|
|
final int count = idStates.size();
|
|
final long[] ids = new long[count];
|
|
|
|
for (int i = 0; i < count; i++) {
|
|
ids[i] = idStates.keyAt(i);
|
|
}
|
|
|
|
return ids;
|
|
}
|
|
|
|
/**
|
|
* Clear any choices previously set
|
|
*/
|
|
public void clearChoices() {
|
|
if (mCheckStates != null) {
|
|
mCheckStates.clear();
|
|
}
|
|
if (mCheckedIdStates != null) {
|
|
mCheckedIdStates.clear();
|
|
}
|
|
mCheckedItemCount = 0;
|
|
}
|
|
|
|
/**
|
|
* Sets the checked state of the specified position. The is only valid if
|
|
* the choice mode has been set to {@link #CHOICE_MODE_SINGLE} or
|
|
* {@link #CHOICE_MODE_MULTIPLE}.
|
|
*
|
|
* @param position The item whose checked state is to be checked
|
|
* @param value The new checked state for the item
|
|
*/
|
|
public void setItemChecked(int position, boolean value) {
|
|
if (mChoiceMode == CHOICE_MODE_NONE) {
|
|
return;
|
|
}
|
|
|
|
// Start selection mode if needed. We don't need to if we're unchecking something.
|
|
if (value && mChoiceMode == CHOICE_MODE_MULTIPLE_MODAL && mChoiceActionMode == null) {
|
|
if (mMultiChoiceModeCallback == null ||
|
|
!mMultiChoiceModeCallback.hasWrappedCallback()) {
|
|
throw new IllegalStateException("AbsListView: attempted to start selection mode " +
|
|
"for CHOICE_MODE_MULTIPLE_MODAL but no choice mode callback was " +
|
|
"supplied. Call setMultiChoiceModeListener to set a callback.");
|
|
}
|
|
mChoiceActionMode = null; // startActionMode(mMultiChoiceModeCallback);
|
|
}
|
|
|
|
if (mChoiceMode == CHOICE_MODE_MULTIPLE || mChoiceMode == CHOICE_MODE_MULTIPLE_MODAL) {
|
|
boolean oldValue = mCheckStates.get(position);
|
|
mCheckStates.put(position, value);
|
|
if (mCheckedIdStates != null && mAdapter.hasStableIds()) {
|
|
if (value) {
|
|
mCheckedIdStates.put(mAdapter.getItemId(position), position);
|
|
} else {
|
|
mCheckedIdStates.delete(mAdapter.getItemId(position));
|
|
}
|
|
}
|
|
if (oldValue != value) {
|
|
if (value) {
|
|
mCheckedItemCount++;
|
|
} else {
|
|
mCheckedItemCount--;
|
|
}
|
|
}
|
|
if (mChoiceActionMode != null) {
|
|
final long id = mAdapter.getItemId(position);
|
|
mMultiChoiceModeCallback.onItemCheckedStateChanged(mChoiceActionMode,
|
|
position, id, value);
|
|
}
|
|
} else {
|
|
boolean updateIds = mCheckedIdStates != null && mAdapter.hasStableIds();
|
|
// Clear all values if we're checking something, or unchecking the currently
|
|
// selected item
|
|
if (value || isItemChecked(position)) {
|
|
mCheckStates.clear();
|
|
if (updateIds) {
|
|
mCheckedIdStates.clear();
|
|
}
|
|
}
|
|
// this may end up selecting the value we just cleared but this way
|
|
// we ensure length of mCheckStates is 1, a fact getCheckedItemPosition relies on
|
|
if (value) {
|
|
mCheckStates.put(position, true);
|
|
if (updateIds) {
|
|
mCheckedIdStates.put(mAdapter.getItemId(position), position);
|
|
}
|
|
mCheckedItemCount = 1;
|
|
} else if (mCheckStates.size() == 0 || !mCheckStates.valueAt(0)) {
|
|
mCheckedItemCount = 0;
|
|
}
|
|
}
|
|
|
|
// Do not generate a data change while we are in the layout phase
|
|
if (!mInLayout && !mBlockLayoutRequests) {
|
|
mDataChanged = true;
|
|
rememberSyncState();
|
|
requestLayout();
|
|
}
|
|
}
|
|
|
|
@Override
|
|
public boolean performItemClick(View view, int position, long id) {
|
|
boolean handled = false;
|
|
boolean dispatchItemClick = true;
|
|
|
|
if (mChoiceMode != CHOICE_MODE_NONE) {
|
|
handled = true;
|
|
boolean checkedStateChanged = false;
|
|
|
|
if (mChoiceMode == CHOICE_MODE_MULTIPLE ||
|
|
(mChoiceMode == CHOICE_MODE_MULTIPLE_MODAL && mChoiceActionMode != null)) {
|
|
boolean checked = !mCheckStates.get(position, false);
|
|
mCheckStates.put(position, checked);
|
|
if (mCheckedIdStates != null && mAdapter.hasStableIds()) {
|
|
if (checked) {
|
|
mCheckedIdStates.put(mAdapter.getItemId(position), position);
|
|
} else {
|
|
mCheckedIdStates.delete(mAdapter.getItemId(position));
|
|
}
|
|
}
|
|
if (checked) {
|
|
mCheckedItemCount++;
|
|
} else {
|
|
mCheckedItemCount--;
|
|
}
|
|
if (mChoiceActionMode != null) {
|
|
mMultiChoiceModeCallback.onItemCheckedStateChanged(mChoiceActionMode,
|
|
position, id, checked);
|
|
dispatchItemClick = false;
|
|
}
|
|
checkedStateChanged = true;
|
|
} else if (mChoiceMode == CHOICE_MODE_SINGLE) {
|
|
boolean checked = !mCheckStates.get(position, false);
|
|
if (checked) {
|
|
mCheckStates.clear();
|
|
mCheckStates.put(position, true);
|
|
if (mCheckedIdStates != null && mAdapter.hasStableIds()) {
|
|
mCheckedIdStates.clear();
|
|
mCheckedIdStates.put(mAdapter.getItemId(position), position);
|
|
}
|
|
mCheckedItemCount = 1;
|
|
} else if (mCheckStates.size() == 0 || !mCheckStates.valueAt(0)) {
|
|
mCheckedItemCount = 0;
|
|
}
|
|
checkedStateChanged = true;
|
|
}
|
|
|
|
if (checkedStateChanged) {
|
|
updateOnScreenCheckedViews();
|
|
}
|
|
}
|
|
|
|
if (dispatchItemClick) {
|
|
handled |= super.performItemClick(view, position, id);
|
|
}
|
|
|
|
return handled;
|
|
}
|
|
|
|
/**
|
|
* Perform a quick, in-place update of the checked or activated state
|
|
* on all visible item views. This should only be called when a valid
|
|
* choice mode is active.
|
|
*/
|
|
private void updateOnScreenCheckedViews() {
|
|
final int firstPos = mFirstPosition;
|
|
final int count = getChildCount();
|
|
final boolean useActivated = getContext().getApplicationInfo().targetSdkVersion
|
|
>= android.os.Build.VERSION_CODES.HONEYCOMB;
|
|
for (int i = 0; i < count; i++) {
|
|
final View child = getChildAt(i);
|
|
final int position = firstPos + i;
|
|
|
|
if (child instanceof Checkable) {
|
|
((Checkable) child).setChecked(mCheckStates.get(position));
|
|
} else if (useActivated) {
|
|
child.setActivated(mCheckStates.get(position));
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @see #setChoiceMode(int)
|
|
*
|
|
* @return The current choice mode
|
|
*/
|
|
public int getChoiceMode() {
|
|
return mChoiceMode;
|
|
}
|
|
|
|
/**
|
|
* Defines the choice behavior for the List. By default, Lists do not have any choice behavior
|
|
* ({@link #CHOICE_MODE_NONE}). By setting the choiceMode to {@link #CHOICE_MODE_SINGLE}, the
|
|
* List allows up to one item to be in a chosen state. By setting the choiceMode to
|
|
* {@link #CHOICE_MODE_MULTIPLE}, the list allows any number of items to be chosen.
|
|
*
|
|
* @param choiceMode One of {@link #CHOICE_MODE_NONE}, {@link #CHOICE_MODE_SINGLE}, or
|
|
* {@link #CHOICE_MODE_MULTIPLE}
|
|
*/
|
|
public void setChoiceMode(int choiceMode) {
|
|
mChoiceMode = choiceMode;
|
|
if (mChoiceActionMode != null) {
|
|
mChoiceActionMode.finish();
|
|
mChoiceActionMode = null;
|
|
}
|
|
if (mChoiceMode != CHOICE_MODE_NONE) {
|
|
if (mCheckStates == null) {
|
|
mCheckStates = new SparseBooleanArray(0);
|
|
}
|
|
if (mCheckedIdStates == null && mAdapter != null && mAdapter.hasStableIds()) {
|
|
mCheckedIdStates = new LongSparseArray<Integer>(0);
|
|
}
|
|
// Modal multi-choice mode only has choices when the mode is active. Clear them.
|
|
if (mChoiceMode == CHOICE_MODE_MULTIPLE_MODAL) {
|
|
clearChoices();
|
|
setLongClickable(true);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Set a {@link MultiChoiceModeListener} that will manage the lifecycle of the
|
|
* selection {@link ActionMode}. Only used when the choice mode is set to
|
|
* {@link #CHOICE_MODE_MULTIPLE_MODAL}.
|
|
*
|
|
* @param listener Listener that will manage the selection mode
|
|
*
|
|
* @see #setChoiceMode(int)
|
|
*/
|
|
public void setMultiChoiceModeListener(MultiChoiceModeListener listener) {
|
|
if (mMultiChoiceModeCallback == null) {
|
|
mMultiChoiceModeCallback = new MultiChoiceModeWrapper();
|
|
}
|
|
mMultiChoiceModeCallback.setWrapped(listener);
|
|
}
|
|
|
|
/**
|
|
* @return true if all list content currently fits within the view boundaries
|
|
*/
|
|
private boolean contentFits() {
|
|
final int childCount = getChildCount();
|
|
if (childCount == 0) return true;
|
|
if (childCount != mItemCount) return false;
|
|
|
|
return getChildAt(0).getTop() >= mListPadding.top &&
|
|
getChildAt(childCount - 1).getBottom() <= getHeight() - mListPadding.bottom;
|
|
}
|
|
|
|
/**
|
|
* Specifies whether fast scrolling is enabled or disabled.
|
|
* <p>
|
|
* When fast scrolling is enabled, the user can quickly scroll through lists
|
|
* by dragging the fast scroll thumb.
|
|
* <p>
|
|
* If the adapter backing this list implements {@link SectionIndexer}, the
|
|
* fast scroller will display section header previews as the user scrolls.
|
|
* Additionally, the user will be able to quickly jump between sections by
|
|
* tapping along the length of the scroll bar.
|
|
*
|
|
* @see SectionIndexer
|
|
* @see #isFastScrollEnabled()
|
|
* @param enabled true to enable fast scrolling, false otherwise
|
|
*/
|
|
public void setFastScrollEnabled(final boolean enabled) {
|
|
if (mFastScrollEnabled != enabled) {
|
|
mFastScrollEnabled = enabled;
|
|
|
|
if (isOwnerThread()) {
|
|
setFastScrollerEnabledUiThread(enabled);
|
|
} else {
|
|
post(new Runnable() {
|
|
@Override
|
|
public void run() {
|
|
setFastScrollerEnabledUiThread(enabled);
|
|
}
|
|
});
|
|
}
|
|
}
|
|
}
|
|
|
|
private void setFastScrollerEnabledUiThread(boolean enabled) {
|
|
// if (mFastScroll != null) {
|
|
// mFastScroll.setEnabled(enabled);
|
|
// } else if (enabled) {
|
|
// mFastScroll = new FastScroller(this, mFastScrollStyle);
|
|
// mFastScroll.setEnabled(true);
|
|
// }
|
|
|
|
// resolvePadding();
|
|
|
|
// if (mFastScroll != null) {
|
|
// mFastScroll.updateLayout();
|
|
// }
|
|
}
|
|
|
|
/**
|
|
* Specifies the style of the fast scroller decorations.
|
|
*
|
|
* @param styleResId style resource containing fast scroller properties
|
|
* @see android.R.styleable#FastScroll
|
|
*/
|
|
public void setFastScrollStyle(int styleResId) {
|
|
// if (mFastScroll == null) {
|
|
// mFastScrollStyle = styleResId;
|
|
// } else {
|
|
// mFastScroll.setStyle(styleResId);
|
|
// }
|
|
}
|
|
|
|
/**
|
|
* Set whether or not the fast scroller should always be shown in place of
|
|
* the standard scroll bars. This will enable fast scrolling if it is not
|
|
* already enabled.
|
|
* <p>
|
|
* Fast scrollers shown in this way will not fade out and will be a
|
|
* permanent fixture within the list. This is best combined with an inset
|
|
* scroll bar style to ensure the scroll bar does not overlap content.
|
|
*
|
|
* @param alwaysShow true if the fast scroller should always be displayed,
|
|
* false otherwise
|
|
* @see #setScrollBarStyle(int)
|
|
* @see #setFastScrollEnabled(boolean)
|
|
*/
|
|
public void setFastScrollAlwaysVisible(final boolean alwaysShow) {
|
|
if (mFastScrollAlwaysVisible != alwaysShow) {
|
|
if (alwaysShow && !mFastScrollEnabled) {
|
|
setFastScrollEnabled(true);
|
|
}
|
|
|
|
mFastScrollAlwaysVisible = alwaysShow;
|
|
|
|
if (isOwnerThread()) {
|
|
setFastScrollerAlwaysVisibleUiThread(alwaysShow);
|
|
} else {
|
|
post(new Runnable() {
|
|
@Override
|
|
public void run() {
|
|
setFastScrollerAlwaysVisibleUiThread(alwaysShow);
|
|
}
|
|
});
|
|
}
|
|
}
|
|
}
|
|
|
|
private void setFastScrollerAlwaysVisibleUiThread(boolean alwaysShow) {
|
|
// if (mFastScroll != null) {
|
|
// mFastScroll.setAlwaysShow(alwaysShow);
|
|
// }
|
|
}
|
|
|
|
/**
|
|
* @return whether the current thread is the one that created the view
|
|
*/
|
|
private boolean isOwnerThread() {
|
|
return mOwnerThread == Thread.currentThread();
|
|
}
|
|
|
|
/**
|
|
* Returns true if the fast scroller is set to always show on this view.
|
|
*
|
|
* @return true if the fast scroller will always show
|
|
* @see #setFastScrollAlwaysVisible(boolean)
|
|
*/
|
|
public boolean isFastScrollAlwaysVisible() {
|
|
// if (mFastScroll == null) {
|
|
return mFastScrollEnabled && mFastScrollAlwaysVisible;
|
|
// } else {
|
|
// return mFastScroll.isEnabled() && mFastScroll.isAlwaysShowEnabled();
|
|
// }
|
|
}
|
|
|
|
/**
|
|
* Returns true if the fast scroller is enabled.
|
|
*
|
|
* @see #setFastScrollEnabled(boolean)
|
|
* @return true if fast scroll is enabled, false otherwise
|
|
*/
|
|
public boolean isFastScrollEnabled() {
|
|
// if (mFastScroll == null) {
|
|
return mFastScrollEnabled;
|
|
// } else {
|
|
// return mFastScroll.isEnabled();
|
|
// }
|
|
}
|
|
|
|
// @Override
|
|
// public void setVerticalScrollbarPosition(int position) {
|
|
// super.setVerticalScrollbarPosition(position);
|
|
// if (mFastScroll != null) {
|
|
// mFastScroll.setScrollbarPosition(position);
|
|
// }
|
|
// }
|
|
|
|
// @Override
|
|
// public void setScrollBarStyle(int style) {
|
|
// super.setScrollBarStyle(style);
|
|
// if (mFastScroll != null) {
|
|
// mFastScroll.setScrollBarStyle(style);
|
|
// }
|
|
// }
|
|
|
|
/**
|
|
* If fast scroll is enabled, then don't draw the vertical scrollbar.
|
|
* @hide
|
|
*/
|
|
protected boolean isVerticalScrollBarHidden() {
|
|
return isFastScrollEnabled();
|
|
}
|
|
|
|
/**
|
|
* When smooth scrollbar is enabled, the position and size of the scrollbar thumb
|
|
* is computed based on the number of visible pixels in the visible items. This
|
|
* however assumes that all list items have the same height. If you use a list in
|
|
* which items have different heights, the scrollbar will change appearance as the
|
|
* user scrolls through the list. To avoid this issue, you need to disable this
|
|
* property.
|
|
*
|
|
* When smooth scrollbar is disabled, the position and size of the scrollbar thumb
|
|
* is based solely on the number of items in the adapter and the position of the
|
|
* visible items inside the adapter. This provides a stable scrollbar as the user
|
|
* navigates through a list of items with varying heights.
|
|
*
|
|
* @param enabled Whether or not to enable smooth scrollbar.
|
|
*
|
|
* @see #setSmoothScrollbarEnabled(boolean)
|
|
* @attr ref android.R.styleable#AbsListView_smoothScrollbar
|
|
*/
|
|
public void setSmoothScrollbarEnabled(boolean enabled) {
|
|
mSmoothScrollbarEnabled = enabled;
|
|
}
|
|
|
|
/**
|
|
* Returns the current state of the fast scroll feature.
|
|
*
|
|
* @return True if smooth scrollbar is enabled is enabled, false otherwise.
|
|
*
|
|
* @see #setSmoothScrollbarEnabled(boolean)
|
|
*/
|
|
public boolean isSmoothScrollbarEnabled() {
|
|
return mSmoothScrollbarEnabled;
|
|
}
|
|
|
|
/**
|
|
* Set the listener that will receive notifications every time the list scrolls.
|
|
*
|
|
* @param l the scroll listener
|
|
*/
|
|
public void setOnScrollListener(OnScrollListener l) {
|
|
mOnScrollListener = l;
|
|
invokeOnItemScrollListener();
|
|
}
|
|
|
|
/**
|
|
* Notify our scroll listener (if there is one) of a change in scroll state
|
|
*/
|
|
void invokeOnItemScrollListener() {
|
|
// if (mFastScroll != null) {
|
|
// mFastScroll.onScroll(mFirstPosition, getChildCount(), mItemCount);
|
|
// }
|
|
if (mOnScrollListener != null) {
|
|
mOnScrollListener.onScroll(this, mFirstPosition, getChildCount(), mItemCount);
|
|
}
|
|
onScrollChanged(0, 0, 0, 0); // dummy values, View's implementation does not use these.
|
|
}
|
|
|
|
/**
|
|
* Indicates whether the children's drawing cache is used during a scroll.
|
|
* By default, the drawing cache is enabled but this will consume more memory.
|
|
*
|
|
* @return true if the scrolling cache is enabled, false otherwise
|
|
*
|
|
* @see #setScrollingCacheEnabled(boolean)
|
|
* @see View#setDrawingCacheEnabled(boolean)
|
|
*/
|
|
public boolean isScrollingCacheEnabled() {
|
|
return mScrollingCacheEnabled;
|
|
}
|
|
|
|
/**
|
|
* Enables or disables the children's drawing cache during a scroll.
|
|
* By default, the drawing cache is enabled but this will use more memory.
|
|
*
|
|
* When the scrolling cache is enabled, the caches are kept after the
|
|
* first scrolling. You can manually clear the cache by calling
|
|
* {@link android.view.ViewGroup#setChildrenDrawingCacheEnabled(boolean)}.
|
|
*
|
|
* @param enabled true to enable the scroll cache, false otherwise
|
|
*
|
|
* @see #isScrollingCacheEnabled()
|
|
* @see View#setDrawingCacheEnabled(boolean)
|
|
*/
|
|
public void setScrollingCacheEnabled(boolean enabled) {
|
|
if (mScrollingCacheEnabled && !enabled) {
|
|
clearScrollingCache();
|
|
}
|
|
mScrollingCacheEnabled = enabled;
|
|
}
|
|
|
|
/**
|
|
* Enables or disables the type filter window. If enabled, typing when
|
|
* this view has focus will filter the children to match the users input.
|
|
* Note that the {@link Adapter} used by this view must implement the
|
|
* {@link Filterable} interface.
|
|
*
|
|
* @param textFilterEnabled true to enable type filtering, false otherwise
|
|
*
|
|
* @see Filterable
|
|
*/
|
|
public void setTextFilterEnabled(boolean textFilterEnabled) {
|
|
mTextFilterEnabled = textFilterEnabled;
|
|
}
|
|
|
|
/**
|
|
* Indicates whether type filtering is enabled for this view
|
|
*
|
|
* @return true if type filtering is enabled, false otherwise
|
|
*
|
|
* @see #setTextFilterEnabled(boolean)
|
|
* @see Filterable
|
|
*/
|
|
public boolean isTextFilterEnabled() {
|
|
return mTextFilterEnabled;
|
|
}
|
|
|
|
private void useDefaultSelector() {
|
|
setSelector(getContext().getDrawable(
|
|
com.android.internal.R.drawable.list_selector_background));
|
|
}
|
|
|
|
/**
|
|
* Indicates whether the content of this view is pinned to, or stacked from,
|
|
* the bottom edge.
|
|
*
|
|
* @return true if the content is stacked from the bottom edge, false otherwise
|
|
*/
|
|
public boolean isStackFromBottom() {
|
|
return mStackFromBottom;
|
|
}
|
|
|
|
/**
|
|
* When stack from bottom is set to true, the list fills its content starting from
|
|
* the bottom of the view.
|
|
*
|
|
* @param stackFromBottom true to pin the view's content to the bottom edge,
|
|
* false to pin the view's content to the top edge
|
|
*/
|
|
public void setStackFromBottom(boolean stackFromBottom) {
|
|
if (mStackFromBottom != stackFromBottom) {
|
|
mStackFromBottom = stackFromBottom;
|
|
requestLayoutIfNecessary();
|
|
}
|
|
}
|
|
|
|
void requestLayoutIfNecessary() {
|
|
if (getChildCount() > 0) {
|
|
resetList();
|
|
requestLayout();
|
|
invalidate();
|
|
}
|
|
}
|
|
|
|
private boolean acceptFilter() {
|
|
return mTextFilterEnabled && getAdapter() instanceof Filterable &&
|
|
((Filterable) getAdapter()).getFilter() != null;
|
|
}
|
|
|
|
/**
|
|
* Sets the initial value for the text filter.
|
|
* @param filterText The text to use for the filter.
|
|
*
|
|
* @see #setTextFilterEnabled
|
|
*/
|
|
public void setFilterText(String filterText) {
|
|
// TODO: Should we check for acceptFilter()?
|
|
if (mTextFilterEnabled && !TextUtils.isEmpty(filterText)) {
|
|
createTextFilter(false);
|
|
// This is going to call our listener onTextChanged, but we might not
|
|
// be ready to bring up a window yet
|
|
mTextFilter.setText(filterText);
|
|
mTextFilter.setSelection(filterText.length());
|
|
if (mAdapter instanceof Filterable) {
|
|
// if mPopup is non-null, then onTextChanged will do the filtering
|
|
if (mPopup == null) {
|
|
Filter f = ((Filterable) mAdapter).getFilter();
|
|
f.filter(filterText);
|
|
}
|
|
// Set filtered to true so we will display the filter window when our main
|
|
// window is ready
|
|
mFiltered = true;
|
|
mDataSetObserver.clearSavedState();
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Returns the list's text filter, if available.
|
|
* @return the list's text filter or null if filtering isn't enabled
|
|
*/
|
|
public CharSequence getTextFilter() {
|
|
if (mTextFilterEnabled && mTextFilter != null) {
|
|
return mTextFilter.getText();
|
|
}
|
|
return null;
|
|
}
|
|
|
|
protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) {
|
|
// super.onFocusChanged(gainFocus, direction, previouslyFocusedRect);
|
|
if (gainFocus && mSelectedPosition < 0 && !isInTouchMode()) {
|
|
if (!isAttachedToWindow() && mAdapter != null) {
|
|
// Data may have changed while we were detached and it's valid
|
|
// to change focus while detached. Refresh so we don't die.
|
|
mDataChanged = true;
|
|
mOldItemCount = mItemCount;
|
|
mItemCount = mAdapter.getCount();
|
|
}
|
|
resurrectSelection();
|
|
}
|
|
}
|
|
|
|
@Override
|
|
public void requestLayout() {
|
|
if (!mBlockLayoutRequests && !mInLayout) {
|
|
super.requestLayout();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* The list is empty. Clear everything out.
|
|
*/
|
|
void resetList() {
|
|
// removeAllViewsInLayout();
|
|
for (int i = getChildCount() - 1; i >= 0; i--) {
|
|
removeViewInLayout(getChildAt(i));
|
|
}
|
|
mFirstPosition = 0;
|
|
mDataChanged = false;
|
|
mPositionScrollAfterLayout = null;
|
|
mNeedSync = false;
|
|
mOldSelectedPosition = INVALID_POSITION;
|
|
mOldSelectedRowId = INVALID_ROW_ID;
|
|
setSelectedPositionInt(INVALID_POSITION);
|
|
setNextSelectedPositionInt(INVALID_POSITION);
|
|
mSelectedTop = 0;
|
|
mSelectorPosition = INVALID_POSITION;
|
|
mSelectorRect.setEmpty();
|
|
invalidate();
|
|
}
|
|
|
|
@Override
|
|
protected int computeVerticalScrollExtent() {
|
|
final int count = getChildCount();
|
|
if (count > 0) {
|
|
if (mSmoothScrollbarEnabled) {
|
|
int extent = count * 100;
|
|
|
|
View view = getChildAt(0);
|
|
final int top = view.getTop();
|
|
int height = view.getHeight();
|
|
if (height > 0) {
|
|
extent += (top * 100) / height;
|
|
}
|
|
|
|
view = getChildAt(count - 1);
|
|
final int bottom = view.getBottom();
|
|
height = view.getHeight();
|
|
if (height > 0) {
|
|
extent -= ((bottom - getHeight()) * 100) / height;
|
|
}
|
|
|
|
return extent;
|
|
} else {
|
|
return 1;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
protected int computeVerticalScrollOffset() {
|
|
final int firstPosition = mFirstPosition;
|
|
final int childCount = getChildCount();
|
|
if (firstPosition >= 0 && childCount > 0) {
|
|
if (mSmoothScrollbarEnabled) {
|
|
final View view = getChildAt(0);
|
|
final int top = view.getTop();
|
|
int height = view.getHeight();
|
|
if (height > 0) {
|
|
return Math.max(firstPosition * 100 - (top * 100) / height +
|
|
(int)((float)getScrollY() / getHeight() * mItemCount * 100), 0);
|
|
}
|
|
} else {
|
|
int index;
|
|
final int count = mItemCount;
|
|
if (firstPosition == 0) {
|
|
index = 0;
|
|
} else if (firstPosition + childCount == count) {
|
|
index = count;
|
|
} else {
|
|
index = firstPosition + childCount / 2;
|
|
}
|
|
return (int) (firstPosition + childCount * (index / (float) count));
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
@Override
|
|
protected int computeVerticalScrollRange() {
|
|
int result;
|
|
if (mSmoothScrollbarEnabled) {
|
|
result = Math.max(mItemCount * 100, 0);
|
|
if (getScrollY() != 0) {
|
|
// Compensate for overscroll
|
|
result += Math.abs((int) ((float) getScrollY() / getHeight() * mItemCount * 100));
|
|
}
|
|
} else {
|
|
result = mItemCount;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
@Override
|
|
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
|
|
if (mSelector == null) {
|
|
useDefaultSelector();
|
|
}
|
|
final Rect listPadding = mListPadding;
|
|
listPadding.left = mSelectionLeftPadding + paddingLeft;
|
|
listPadding.top = mSelectionTopPadding + paddingTop;
|
|
listPadding.right = mSelectionRightPadding + paddingRight;
|
|
listPadding.bottom = mSelectionBottomPadding + paddingBottom;
|
|
|
|
// Check if our previous measured size was at a point where we should scroll later.
|
|
if (mTranscriptMode == TRANSCRIPT_MODE_NORMAL) {
|
|
final int childCount = getChildCount();
|
|
final int listBottom = getHeight() - getPaddingBottom();
|
|
final View lastChild = getChildAt(childCount - 1);
|
|
final int lastBottom = lastChild != null ? lastChild.getBottom() : listBottom;
|
|
mForceTranscriptScroll = mFirstPosition + childCount >= mLastHandledItemCount &&
|
|
lastBottom <= listBottom;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Subclasses should NOT override this method but
|
|
* {@link #layoutChildren()} instead.
|
|
*/
|
|
@Override
|
|
protected void onLayout(boolean changed, int l, int t, int r, int b) {
|
|
super.onLayout(changed, l, t, r, b);
|
|
|
|
mInLayout = true;
|
|
|
|
final int childCount = getChildCount();
|
|
if (changed) {
|
|
for (int i = 0; i < childCount; i++) {
|
|
getChildAt(i).forceLayout();
|
|
}
|
|
mRecycler.markChildrenDirty();
|
|
}
|
|
|
|
layoutChildren();
|
|
mInLayout = false;
|
|
|
|
mOverscrollMax = (b - t) / OVERSCROLL_LIMIT_DIVISOR;
|
|
|
|
// TODO: Move somewhere sane. This doesn't belong in onLayout().
|
|
// if (mFastScroll != null) {
|
|
// mFastScroll.onItemCountChanged(getChildCount(), mItemCount);
|
|
// }
|
|
}
|
|
|
|
/**
|
|
* Subclasses must override this method to layout their children.
|
|
*/
|
|
protected void layoutChildren() {
|
|
}
|
|
|
|
/**
|
|
* @param focusedView view that holds accessibility focus
|
|
* @return direct child that contains accessibility focus, or null if no
|
|
* child contains accessibility focus
|
|
*/
|
|
View getAccessibilityFocusedChild(View focusedView) {
|
|
ViewParent viewParent = focusedView.getParent();
|
|
while ((viewParent instanceof View) && (viewParent != this)) {
|
|
focusedView = (View) viewParent;
|
|
viewParent = viewParent.getParent();
|
|
}
|
|
|
|
if (!(viewParent instanceof View)) {
|
|
return null;
|
|
}
|
|
|
|
return focusedView;
|
|
}
|
|
|
|
void updateScrollIndicators() {
|
|
if (mScrollUp != null) {
|
|
mScrollUp.setVisibility(canScrollUp() ? View.VISIBLE : View.INVISIBLE);
|
|
}
|
|
|
|
if (mScrollDown != null) {
|
|
mScrollDown.setVisibility(canScrollDown() ? View.VISIBLE : View.INVISIBLE);
|
|
}
|
|
}
|
|
|
|
private boolean canScrollUp() {
|
|
boolean canScrollUp;
|
|
// 0th element is not visible
|
|
canScrollUp = mFirstPosition > 0;
|
|
|
|
// ... Or top of 0th element is not visible
|
|
if (!canScrollUp) {
|
|
if (getChildCount() > 0) {
|
|
View child = getChildAt(0);
|
|
canScrollUp = child.getTop() < mListPadding.top;
|
|
}
|
|
}
|
|
|
|
return canScrollUp;
|
|
}
|
|
|
|
private boolean canScrollDown() {
|
|
boolean canScrollDown;
|
|
int count = getChildCount();
|
|
|
|
// Last item is not visible
|
|
canScrollDown = (mFirstPosition + count) < mItemCount;
|
|
|
|
// ... Or bottom of the last element is not visible
|
|
if (!canScrollDown && count > 0) {
|
|
View child = getChildAt(count - 1);
|
|
canScrollDown = child.getBottom() > getBottom() - mListPadding.bottom;
|
|
}
|
|
|
|
return canScrollDown;
|
|
}
|
|
|
|
@Override
|
|
public View getSelectedView() {
|
|
if (mItemCount > 0 && mSelectedPosition >= 0) {
|
|
return getChildAt(mSelectedPosition - mFirstPosition);
|
|
} else {
|
|
return null;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* List padding is the maximum of the normal view's padding and the padding of the selector.
|
|
*
|
|
* @see android.view.View#getPaddingTop()
|
|
* @see #getSelector()
|
|
*
|
|
* @return The top list padding.
|
|
*/
|
|
public int getListPaddingTop() {
|
|
return mListPadding.top;
|
|
}
|
|
|
|
/**
|
|
* List padding is the maximum of the normal view's padding and the padding of the selector.
|
|
*
|
|
* @see android.view.View#getPaddingBottom()
|
|
* @see #getSelector()
|
|
*
|
|
* @return The bottom list padding.
|
|
*/
|
|
public int getListPaddingBottom() {
|
|
return mListPadding.bottom;
|
|
}
|
|
|
|
/**
|
|
* List padding is the maximum of the normal view's padding and the padding of the selector.
|
|
*
|
|
* @see android.view.View#getPaddingLeft()
|
|
* @see #getSelector()
|
|
*
|
|
* @return The left list padding.
|
|
*/
|
|
public int getListPaddingLeft() {
|
|
return mListPadding.left;
|
|
}
|
|
|
|
/**
|
|
* List padding is the maximum of the normal view's padding and the padding of the selector.
|
|
*
|
|
* @see android.view.View#getPaddingRight()
|
|
* @see #getSelector()
|
|
*
|
|
* @return The right list padding.
|
|
*/
|
|
public int getListPaddingRight() {
|
|
return mListPadding.right;
|
|
}
|
|
|
|
/**
|
|
* Get a view and have it show the data associated with the specified
|
|
* position. This is called when we have already discovered that the view is
|
|
* not available for reuse in the recycle bin. The only choices left are
|
|
* converting an old view or making a new one.
|
|
*
|
|
* @param position The position to display
|
|
* @param isScrap Array of at least 1 boolean, the first entry will become true if
|
|
* the returned view was taken from the scrap heap, false if otherwise.
|
|
*
|
|
* @return A view displaying the data associated with the specified position
|
|
*/
|
|
View obtainView(int position, boolean[] isScrap) {
|
|
Trace.traceBegin(Trace.TRACE_TAG_VIEW, "obtainView");
|
|
|
|
isScrap[0] = false;
|
|
|
|
// Check whether we have a transient state view. Attempt to re-bind the
|
|
// data and discard the view if we fail.
|
|
final View transientView = mRecycler.getTransientStateView(position);
|
|
if (transientView != null) {
|
|
final LayoutParams params = (LayoutParams) transientView.getLayoutParams();
|
|
|
|
// If the view type hasn't changed, attempt to re-bind the data.
|
|
if (params.viewType == mAdapter.getItemViewType(position)) {
|
|
final View updatedView = mAdapter.getView(position, transientView, this);
|
|
|
|
// If we failed to re-bind the data, scrap the obtained view.
|
|
if (updatedView != transientView) {
|
|
setItemViewLayoutParams(updatedView, position);
|
|
mRecycler.addScrapView(updatedView, position);
|
|
}
|
|
}
|
|
|
|
isScrap[0] = true;
|
|
|
|
// Finish the temporary detach started in addScrapView().
|
|
// transientView.dispatchFinishTemporaryDetach();
|
|
return transientView;
|
|
}
|
|
|
|
final View scrapView = mRecycler.getScrapView(position);
|
|
final View child = mAdapter.getView(position, scrapView, this);
|
|
if (scrapView != null) {
|
|
if (child != scrapView) {
|
|
// Failed to re-bind the data, return scrap to the heap.
|
|
mRecycler.addScrapView(scrapView, position);
|
|
} else {
|
|
isScrap[0] = true;
|
|
|
|
// Finish the temporary detach started in addScrapView().
|
|
// child.dispatchFinishTemporaryDetach();
|
|
}
|
|
}
|
|
|
|
if (mCacheColorHint != 0) {
|
|
// child.setDrawingCacheBackgroundColor(mCacheColorHint);
|
|
}
|
|
|
|
setItemViewLayoutParams(child, position);
|
|
|
|
Trace.traceEnd(Trace.TRACE_TAG_VIEW);
|
|
|
|
return child;
|
|
}
|
|
|
|
private void setItemViewLayoutParams(View child, int position) {
|
|
final ViewGroup.LayoutParams vlp = child.getLayoutParams();
|
|
LayoutParams lp;
|
|
if (vlp == null) {
|
|
lp = (LayoutParams) generateDefaultLayoutParams();
|
|
} else if (!checkLayoutParams(vlp)) {
|
|
lp = (LayoutParams) generateLayoutParams(vlp);
|
|
} else {
|
|
lp = (LayoutParams) vlp;
|
|
}
|
|
|
|
if (mAdapterHasStableIds) {
|
|
lp.itemId = mAdapter.getItemId(position);
|
|
}
|
|
lp.viewType = mAdapter.getItemViewType(position);
|
|
lp.isEnabled = mAdapter.isEnabled(position);
|
|
if (lp != vlp) {
|
|
child.setLayoutParams(lp);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Positions the selector in a way that mimics touch.
|
|
*/
|
|
void positionSelectorLikeTouch(int position, View sel, float x, float y) {
|
|
positionSelector(position, sel, true, x, y);
|
|
}
|
|
|
|
/**
|
|
* Positions the selector in a way that mimics keyboard focus.
|
|
*/
|
|
void positionSelectorLikeFocus(int position, View sel) {
|
|
if (mSelector != null && mSelectorPosition != position && position != INVALID_POSITION) {
|
|
final Rect bounds = mSelectorRect;
|
|
final float x = bounds.exactCenterX();
|
|
final float y = bounds.exactCenterY();
|
|
positionSelector(position, sel, true, x, y);
|
|
} else {
|
|
positionSelector(position, sel);
|
|
}
|
|
}
|
|
|
|
void positionSelector(int position, View sel) {
|
|
positionSelector(position, sel, false, -1, -1);
|
|
}
|
|
|
|
private void positionSelector(int position, View sel, boolean manageHotspot, float x, float y) {
|
|
final boolean positionChanged = position != mSelectorPosition;
|
|
if (position != INVALID_POSITION) {
|
|
mSelectorPosition = position;
|
|
}
|
|
|
|
final Rect selectorRect = mSelectorRect;
|
|
selectorRect.set(sel.getLeft(), sel.getTop(), sel.getRight(), sel.getBottom());
|
|
if (sel instanceof SelectionBoundsAdjuster) {
|
|
((SelectionBoundsAdjuster)sel).adjustListItemSelectionBounds(selectorRect);
|
|
}
|
|
|
|
// Adjust for selection padding.
|
|
selectorRect.left -= mSelectionLeftPadding;
|
|
selectorRect.top -= mSelectionTopPadding;
|
|
selectorRect.right += mSelectionRightPadding;
|
|
selectorRect.bottom += mSelectionBottomPadding;
|
|
|
|
// Update the child enabled state prior to updating the selector.
|
|
final boolean isChildViewEnabled = sel.isEnabled();
|
|
if (mIsChildViewEnabled != isChildViewEnabled) {
|
|
mIsChildViewEnabled = isChildViewEnabled;
|
|
}
|
|
|
|
// Update the selector drawable's state and position.
|
|
final Drawable selector = mSelector;
|
|
if (selector != null) {
|
|
if (positionChanged) {
|
|
// Wipe out the current selector state so that we can start
|
|
// over in the new position with a fresh state.
|
|
selector.setVisible(false, false);
|
|
selector.setState(StateSet.NOTHING);
|
|
}
|
|
selector.setBounds(selectorRect);
|
|
if (positionChanged) {
|
|
if (getVisibility() == VISIBLE) {
|
|
selector.setVisible(true, false);
|
|
}
|
|
updateSelectorState();
|
|
}
|
|
if (manageHotspot) {
|
|
// selector.setHotspot(x, y);
|
|
}
|
|
}
|
|
}
|
|
|
|
@Override
|
|
protected void dispatchDraw(Canvas canvas) {
|
|
int saveCount = 0;
|
|
final boolean clipToPadding = false; // (mGroupFlags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK;
|
|
if (clipToPadding) {
|
|
saveCount = canvas.save();
|
|
final int scrollX = getScrollX();
|
|
final int scrollY = getScrollY();
|
|
canvas.clipRect(scrollX + paddingLeft, scrollY + paddingTop,
|
|
scrollX + getRight() - getLeft() - paddingRight,
|
|
scrollY + getBottom() - getTop() - paddingBottom);
|
|
// mGroupFlags &= ~CLIP_TO_PADDING_MASK;
|
|
}
|
|
|
|
final boolean drawSelectorOnTop = mDrawSelectorOnTop;
|
|
if (!drawSelectorOnTop) {
|
|
drawSelector(canvas);
|
|
}
|
|
|
|
super.dispatchDraw(canvas);
|
|
|
|
if (drawSelectorOnTop) {
|
|
drawSelector(canvas);
|
|
}
|
|
|
|
if (clipToPadding) {
|
|
canvas.restoreToCount(saveCount);
|
|
// mGroupFlags |= CLIP_TO_PADDING_MASK;
|
|
}
|
|
}
|
|
|
|
@Override
|
|
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
|
|
if (getChildCount() > 0) {
|
|
mDataChanged = true;
|
|
rememberSyncState();
|
|
}
|
|
|
|
// if (mFastScroll != null) {
|
|
// mFastScroll.onSizeChanged(w, h, oldw, oldh);
|
|
// }
|
|
}
|
|
|
|
/**
|
|
* @return True if the current touch mode requires that we draw the selector in the pressed
|
|
* state.
|
|
*/
|
|
boolean touchModeDrawsInPressedState() {
|
|
// FIXME use isPressed for this
|
|
switch (mTouchMode) {
|
|
case TOUCH_MODE_TAP:
|
|
case TOUCH_MODE_DONE_WAITING:
|
|
return true;
|
|
default:
|
|
return false;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Indicates whether this view is in a state where the selector should be drawn. This will
|
|
* happen if we have focus but are not in touch mode, or we are in the middle of displaying
|
|
* the pressed state for an item.
|
|
*
|
|
* @return True if the selector should be shown
|
|
*/
|
|
boolean shouldShowSelector() {
|
|
return (isFocused() && !isInTouchMode()) || (touchModeDrawsInPressedState() && isPressed());
|
|
}
|
|
|
|
private void drawSelector(Canvas canvas) {
|
|
if (!mSelectorRect.isEmpty()) {
|
|
final Drawable selector = mSelector;
|
|
selector.setBounds(mSelectorRect);
|
|
selector.draw(canvas);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Controls whether the selection highlight drawable should be drawn on top of the item or
|
|
* behind it.
|
|
*
|
|
* @param onTop If true, the selector will be drawn on the item it is highlighting. The default
|
|
* is false.
|
|
*
|
|
* @attr ref android.R.styleable#AbsListView_drawSelectorOnTop
|
|
*/
|
|
public void setDrawSelectorOnTop(boolean onTop) {
|
|
mDrawSelectorOnTop = onTop;
|
|
}
|
|
|
|
/**
|
|
* Set a Drawable that should be used to highlight the currently selected item.
|
|
*
|
|
* @param resID A Drawable resource to use as the selection highlight.
|
|
*
|
|
* @attr ref android.R.styleable#AbsListView_listSelector
|
|
*/
|
|
public void setSelector(int resID) {
|
|
setSelector(getContext().getDrawable(resID));
|
|
}
|
|
|
|
public void setSelector(Drawable sel) {
|
|
if (mSelector != null) {
|
|
mSelector.setCallback(null);
|
|
// unscheduleDrawable(mSelector);
|
|
}
|
|
mSelector = sel;
|
|
Rect padding = new Rect();
|
|
sel.getPadding(padding);
|
|
mSelectionLeftPadding = padding.left;
|
|
mSelectionTopPadding = padding.top;
|
|
mSelectionRightPadding = padding.right;
|
|
mSelectionBottomPadding = padding.bottom;
|
|
sel.setCallback(this);
|
|
updateSelectorState();
|
|
}
|
|
|
|
/**
|
|
* Returns the selector {@link android.graphics.drawable.Drawable} that is used to draw the
|
|
* selection in the list.
|
|
*
|
|
* @return the drawable used to display the selector
|
|
*/
|
|
public Drawable getSelector() {
|
|
return mSelector;
|
|
}
|
|
|
|
/**
|
|
* Sets the selector state to "pressed" and posts a CheckForKeyLongPress to see if
|
|
* this is a long press.
|
|
*/
|
|
void keyPressed() {
|
|
if (!isEnabled() || !isClickable()) {
|
|
return;
|
|
}
|
|
|
|
Drawable selector = mSelector;
|
|
Rect selectorRect = mSelectorRect;
|
|
if (selector != null && (isFocused() || touchModeDrawsInPressedState())
|
|
&& !selectorRect.isEmpty()) {
|
|
|
|
final View v = getChildAt(mSelectedPosition - mFirstPosition);
|
|
|
|
if (v != null) {
|
|
if (v.hasFocusable()) return;
|
|
v.setPressed(true);
|
|
}
|
|
setPressed(true);
|
|
|
|
final boolean longClickable = isLongClickable();
|
|
Drawable d = selector; // selector.getCurrent();
|
|
if (d != null && d instanceof TransitionDrawable) {
|
|
if (longClickable) {
|
|
((TransitionDrawable) d).startTransition(
|
|
ViewConfiguration.getLongPressTimeout());
|
|
} else {
|
|
// ((TransitionDrawable) d).resetTransition();
|
|
}
|
|
}
|
|
if (longClickable && !mDataChanged) {
|
|
if (mPendingCheckForKeyLongPress == null) {
|
|
mPendingCheckForKeyLongPress = new CheckForKeyLongPress();
|
|
}
|
|
// mPendingCheckForKeyLongPress.rememberWindowAttachCount();
|
|
postDelayed(mPendingCheckForKeyLongPress, ViewConfiguration.getLongPressTimeout());
|
|
}
|
|
}
|
|
}
|
|
|
|
public void setScrollIndicators(View up, View down) {
|
|
mScrollUp = up;
|
|
mScrollDown = down;
|
|
}
|
|
|
|
void updateSelectorState() {
|
|
if (mSelector != null) {
|
|
if (shouldShowSelector()) {
|
|
mSelector.setState(getDrawableStateForSelector());
|
|
} else {
|
|
mSelector.setState(StateSet.NOTHING);
|
|
}
|
|
}
|
|
}
|
|
|
|
private int[] getDrawableStateForSelector() {
|
|
// If the child view is enabled then do the default behavior.
|
|
if (mIsChildViewEnabled) {
|
|
// Common case
|
|
return super.getDrawableState();
|
|
}
|
|
|
|
// The selector uses this View's drawable state. The selected child view
|
|
// is disabled, so we need to remove the enabled state from the drawable
|
|
// states.
|
|
final int enabledState = 0; // ENABLED_STATE_SET[0];
|
|
|
|
// If we don't have any extra space, it will return one of the static
|
|
// state arrays, and clearing the enabled state on those arrays is a
|
|
// bad thing! If we specify we need extra space, it will create+copy
|
|
// into a new array that is safely mutable.
|
|
final int[] state = onCreateDrawableState(1);
|
|
|
|
int enabledPos = -1;
|
|
for (int i = state.length - 1; i >= 0; i--) {
|
|
if (state[i] == enabledState) {
|
|
enabledPos = i;
|
|
break;
|
|
}
|
|
}
|
|
|
|
// Remove the enabled state
|
|
if (enabledPos >= 0) {
|
|
System.arraycopy(state, enabledPos + 1, state, enabledPos,
|
|
state.length - enabledPos - 1);
|
|
}
|
|
|
|
return state;
|
|
}
|
|
|
|
@Override
|
|
public void jumpDrawablesToCurrentState() {
|
|
super.jumpDrawablesToCurrentState();
|
|
if (mSelector != null) mSelector.jumpToCurrentState();
|
|
}
|
|
|
|
@Override
|
|
protected void onAttachedToWindow() {
|
|
super.onAttachedToWindow();
|
|
|
|
final ViewTreeObserver treeObserver = getViewTreeObserver();
|
|
treeObserver.addOnTouchModeChangeListener(this);
|
|
if (mTextFilterEnabled && mPopup != null && !mGlobalLayoutListenerAddedFilter) {
|
|
treeObserver.addOnGlobalLayoutListener(this);
|
|
}
|
|
|
|
if (mAdapter != null && mDataSetObserver == null) {
|
|
mDataSetObserver = new AdapterDataSetObserver();
|
|
mAdapter.registerDataSetObserver(mDataSetObserver);
|
|
|
|
// Data may have changed while we were detached. Refresh.
|
|
mDataChanged = true;
|
|
mOldItemCount = mItemCount;
|
|
mItemCount = mAdapter.getCount();
|
|
}
|
|
}
|
|
|
|
@Override
|
|
protected void onDetachedFromWindow() {
|
|
super.onDetachedFromWindow();
|
|
|
|
mIsDetaching = true;
|
|
|
|
// Dismiss the popup in case onSaveInstanceState() was not invoked
|
|
dismissPopup();
|
|
|
|
// Detach any view left in the scrap heap
|
|
mRecycler.clear();
|
|
|
|
final ViewTreeObserver treeObserver = getViewTreeObserver();
|
|
treeObserver.removeOnTouchModeChangeListener(this);
|
|
if (mTextFilterEnabled && mPopup != null) {
|
|
treeObserver.removeOnGlobalLayoutListener(this);
|
|
mGlobalLayoutListenerAddedFilter = false;
|
|
}
|
|
|
|
if (mAdapter != null && mDataSetObserver != null) {
|
|
mAdapter.unregisterDataSetObserver(mDataSetObserver);
|
|
mDataSetObserver = null;
|
|
}
|
|
|
|
if (mFlingRunnable != null) {
|
|
removeCallbacks(mFlingRunnable);
|
|
}
|
|
|
|
if (mPositionScroller != null) {
|
|
mPositionScroller.stop();
|
|
}
|
|
|
|
if (mClearScrollingCache != null) {
|
|
removeCallbacks(mClearScrollingCache);
|
|
}
|
|
|
|
if (mPerformClick != null) {
|
|
removeCallbacks(mPerformClick);
|
|
}
|
|
|
|
if (mTouchModeReset != null) {
|
|
removeCallbacks(mTouchModeReset);
|
|
mTouchModeReset.run();
|
|
}
|
|
|
|
mIsDetaching = false;
|
|
}
|
|
|
|
public void onCancelPendingInputEvents() {
|
|
if (mPerformClick != null) {
|
|
removeCallbacks(mPerformClick);
|
|
}
|
|
if (mPendingCheckForTap != null) {
|
|
removeCallbacks(mPendingCheckForTap);
|
|
}
|
|
if (mPendingCheckForLongPress != null) {
|
|
removeCallbacks(mPendingCheckForLongPress);
|
|
}
|
|
if (mPendingCheckForKeyLongPress != null) {
|
|
removeCallbacks(mPendingCheckForKeyLongPress);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* A base class for Runnables that will check that their view is still attached to
|
|
* the original window as when the Runnable was created.
|
|
*
|
|
*/
|
|
private class WindowRunnnable {
|
|
// private int mOriginalAttachCount;
|
|
|
|
// public void rememberWindowAttachCount() {
|
|
// mOriginalAttachCount = getWindowAttachCount();
|
|
// }
|
|
|
|
public boolean sameWindow() {
|
|
return true; // getWindowAttachCount() == mOriginalAttachCount;
|
|
}
|
|
}
|
|
|
|
private class PerformClick extends WindowRunnnable implements Runnable {
|
|
int mClickMotionPosition;
|
|
|
|
@Override
|
|
public void run() {
|
|
// The data has changed since we posted this action in the event queue,
|
|
// bail out before bad things happen
|
|
if (mDataChanged) return;
|
|
|
|
final ListAdapter adapter = mAdapter;
|
|
final int motionPosition = mClickMotionPosition;
|
|
if (adapter != null && mItemCount > 0 &&
|
|
motionPosition != INVALID_POSITION &&
|
|
motionPosition < adapter.getCount() && sameWindow()) {
|
|
final View view = getChildAt(motionPosition - mFirstPosition);
|
|
// If there is no view, something bad happened (the view scrolled off the
|
|
// screen, etc.) and we should cancel the click
|
|
if (view != null) {
|
|
performItemClick(view, motionPosition, adapter.getItemId(motionPosition));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
private class CheckForLongPress extends WindowRunnnable implements Runnable {
|
|
@Override
|
|
public void run() {
|
|
final int motionPosition = mMotionPosition;
|
|
final View child = getChildAt(motionPosition - mFirstPosition);
|
|
if (child != null) {
|
|
final int longPressPosition = mMotionPosition;
|
|
final long longPressId = mAdapter.getItemId(mMotionPosition);
|
|
|
|
boolean handled = false;
|
|
if (sameWindow() && !mDataChanged) {
|
|
handled = performLongPress(child, longPressPosition, longPressId);
|
|
}
|
|
if (handled) {
|
|
mTouchMode = TOUCH_MODE_REST;
|
|
setPressed(false);
|
|
child.setPressed(false);
|
|
} else {
|
|
mTouchMode = TOUCH_MODE_DONE_WAITING;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
private class CheckForKeyLongPress extends WindowRunnnable implements Runnable {
|
|
@Override
|
|
public void run() {
|
|
if (isPressed() && mSelectedPosition >= 0) {
|
|
int index = mSelectedPosition - mFirstPosition;
|
|
View v = getChildAt(index);
|
|
|
|
if (!mDataChanged) {
|
|
boolean handled = false;
|
|
if (sameWindow()) {
|
|
handled = performLongPress(v, mSelectedPosition, mSelectedRowId);
|
|
}
|
|
if (handled) {
|
|
setPressed(false);
|
|
v.setPressed(false);
|
|
}
|
|
} else {
|
|
setPressed(false);
|
|
if (v != null) v.setPressed(false);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
boolean performLongPress(final View child,
|
|
final int longPressPosition, final long longPressId) {
|
|
// CHOICE_MODE_MULTIPLE_MODAL takes over long press.
|
|
if (mChoiceMode == CHOICE_MODE_MULTIPLE_MODAL) {
|
|
// if (mChoiceActionMode == null &&
|
|
// (mChoiceActionMode = startActionMode(mMultiChoiceModeCallback)) != null) {
|
|
setItemChecked(longPressPosition, true);
|
|
// }
|
|
return true;
|
|
}
|
|
|
|
boolean handled = false;
|
|
if (mOnItemLongClickListener != null) {
|
|
handled = mOnItemLongClickListener.onItemLongClick(AbsListView.this, child,
|
|
longPressPosition, longPressId);
|
|
}
|
|
return handled;
|
|
}
|
|
|
|
public boolean onKeyDown(int keyCode, KeyEvent event) {
|
|
return false;
|
|
}
|
|
|
|
public boolean onKeyUp(int keyCode, KeyEvent event) {
|
|
if (KeyEvent.isConfirmKey(keyCode)) {
|
|
if (!isEnabled()) {
|
|
return true;
|
|
}
|
|
if (isClickable() && isPressed() &&
|
|
mSelectedPosition >= 0 && mAdapter != null &&
|
|
mSelectedPosition < mAdapter.getCount()) {
|
|
|
|
final View view = getChildAt(mSelectedPosition - mFirstPosition);
|
|
if (view != null) {
|
|
performItemClick(view, mSelectedPosition, mSelectedRowId);
|
|
view.setPressed(false);
|
|
}
|
|
setPressed(false);
|
|
return true;
|
|
}
|
|
}
|
|
return false; // super.onKeyUp(keyCode, event);
|
|
}
|
|
|
|
@Override
|
|
protected void dispatchSetPressed(boolean pressed) {
|
|
// Don't dispatch setPressed to our children. We call setPressed on ourselves to
|
|
// get the selector in the right state, but we don't want to press each child.
|
|
}
|
|
|
|
public void dispatchDrawableHotspotChanged(float x, float y) {
|
|
// Don't dispatch hotspot changes to children. We'll manually handle
|
|
// calling drawableHotspotChanged on the correct child.
|
|
}
|
|
|
|
/**
|
|
* Maps a point to a position in the list.
|
|
*
|
|
* @param x X in local coordinate
|
|
* @param y Y in local coordinate
|
|
* @return The position of the item which contains the specified point, or
|
|
* {@link #INVALID_POSITION} if the point does not intersect an item.
|
|
*/
|
|
public int pointToPosition(int x, int y) {
|
|
Rect frame = mTouchFrame;
|
|
if (frame == null) {
|
|
mTouchFrame = new Rect();
|
|
frame = mTouchFrame;
|
|
}
|
|
|
|
final int count = getChildCount();
|
|
for (int i = count - 1; i >= 0; i--) {
|
|
final View child = getChildAt(i);
|
|
if (child.getVisibility() == View.VISIBLE) {
|
|
child.getHitRect(frame);
|
|
if (frame.contains(x, y)) {
|
|
return mFirstPosition + i;
|
|
}
|
|
}
|
|
}
|
|
return INVALID_POSITION;
|
|
}
|
|
|
|
|
|
/**
|
|
* Maps a point to a the rowId of the item which intersects that point.
|
|
*
|
|
* @param x X in local coordinate
|
|
* @param y Y in local coordinate
|
|
* @return The rowId of the item which contains the specified point, or {@link #INVALID_ROW_ID}
|
|
* if the point does not intersect an item.
|
|
*/
|
|
public long pointToRowId(int x, int y) {
|
|
int position = pointToPosition(x, y);
|
|
if (position >= 0) {
|
|
return mAdapter.getItemId(position);
|
|
}
|
|
return INVALID_ROW_ID;
|
|
}
|
|
|
|
private final class CheckForTap implements Runnable {
|
|
// float x;
|
|
// float y;
|
|
|
|
@Override
|
|
public void run() {
|
|
if (mTouchMode == TOUCH_MODE_DOWN) {
|
|
mTouchMode = TOUCH_MODE_TAP;
|
|
final View child = getChildAt(mMotionPosition - mFirstPosition);
|
|
if (child != null && !child.hasFocusable()) {
|
|
mLayoutMode = LAYOUT_NORMAL;
|
|
|
|
if (!mDataChanged) {
|
|
// final float[] point = mTmpPoint;
|
|
// point[0] = x;
|
|
// point[1] = y;
|
|
// transformPointToViewLocal(point, child);
|
|
// child.drawableHotspotChanged(point[0], point[1]);
|
|
child.setPressed(true);
|
|
setPressed(true);
|
|
layoutChildren();
|
|
positionSelector(mMotionPosition, child);
|
|
refreshDrawableState();
|
|
|
|
final int longPressTimeout = ViewConfiguration.getLongPressTimeout();
|
|
final boolean longClickable = isLongClickable();
|
|
|
|
// if (mSelector != null) {
|
|
// final Drawable d = mSelector.getCurrent();
|
|
// if (d != null && d instanceof TransitionDrawable) {
|
|
// if (longClickable) {
|
|
// ((TransitionDrawable) d).startTransition(longPressTimeout);
|
|
// } else {
|
|
// ((TransitionDrawable) d).resetTransition();
|
|
// }
|
|
// }
|
|
// mSelector.setHotspot(x, y);
|
|
// }
|
|
|
|
if (longClickable) {
|
|
if (mPendingCheckForLongPress == null) {
|
|
mPendingCheckForLongPress = new CheckForLongPress();
|
|
}
|
|
// mPendingCheckForLongPress.rememberWindowAttachCount();
|
|
postDelayed(mPendingCheckForLongPress, longPressTimeout);
|
|
} else {
|
|
mTouchMode = TOUCH_MODE_DONE_WAITING;
|
|
}
|
|
} else {
|
|
mTouchMode = TOUCH_MODE_DONE_WAITING;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
private boolean startScrollIfNeeded(int x, int y, MotionEvent vtev) {
|
|
// Check if we have moved far enough that it looks more like a
|
|
// scroll than a tap
|
|
final int deltaY = y - mMotionY;
|
|
final int distance = Math.abs(deltaY);
|
|
final boolean overscroll = getScrollY() != 0;
|
|
if ((overscroll || distance > mTouchSlop) /* &&
|
|
(getNestedScrollAxes() & SCROLL_AXIS_VERTICAL) == 0 */) {
|
|
createScrollingCache();
|
|
if (overscroll) {
|
|
mTouchMode = TOUCH_MODE_OVERSCROLL;
|
|
mMotionCorrection = 0;
|
|
} else {
|
|
mTouchMode = TOUCH_MODE_SCROLL;
|
|
mMotionCorrection = deltaY > 0 ? mTouchSlop : -mTouchSlop;
|
|
}
|
|
removeCallbacks(mPendingCheckForLongPress);
|
|
setPressed(false);
|
|
final View motionView = getChildAt(mMotionPosition - mFirstPosition);
|
|
if (motionView != null) {
|
|
motionView.setPressed(false);
|
|
}
|
|
reportScrollStateChange(OnScrollListener.SCROLL_STATE_TOUCH_SCROLL);
|
|
// Time to start stealing events! Once we've stolen them, don't let anyone
|
|
// steal from us
|
|
final ViewParent parent = getParent();
|
|
if (parent != null) {
|
|
parent.requestDisallowInterceptTouchEvent(true);
|
|
}
|
|
scrollIfNeeded(x, y, vtev);
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
private void scrollIfNeeded(int x, int y, MotionEvent vtev) {
|
|
int rawDeltaY = y - mMotionY;
|
|
int scrollOffsetCorrection = 0;
|
|
int scrollConsumedCorrection = 0;
|
|
if (mLastY == Integer.MIN_VALUE) {
|
|
rawDeltaY -= mMotionCorrection;
|
|
}
|
|
// if (dispatchNestedPreScroll(0, mLastY != Integer.MIN_VALUE ? mLastY - y : -rawDeltaY,
|
|
// mScrollConsumed, mScrollOffset)) {
|
|
// rawDeltaY += mScrollConsumed[1];
|
|
// scrollOffsetCorrection = -mScrollOffset[1];
|
|
// scrollConsumedCorrection = mScrollConsumed[1];
|
|
// if (vtev != null) {
|
|
// vtev.offsetLocation(0, mScrollOffset[1]);
|
|
// mNestedYOffset += mScrollOffset[1];
|
|
// }
|
|
// }
|
|
final int deltaY = rawDeltaY;
|
|
int incrementalDeltaY =
|
|
mLastY != Integer.MIN_VALUE ? y - mLastY + scrollConsumedCorrection : deltaY;
|
|
int lastYCorrection = 0;
|
|
|
|
if (mTouchMode == TOUCH_MODE_SCROLL) {
|
|
if (PROFILE_SCROLLING) {
|
|
if (!mScrollProfilingStarted) {
|
|
// Debug.startMethodTracing("AbsListViewScroll");
|
|
mScrollProfilingStarted = true;
|
|
}
|
|
}
|
|
|
|
if (y != mLastY) {
|
|
// We may be here after stopping a fling and continuing to scroll.
|
|
// If so, we haven't disallowed intercepting touch events yet.
|
|
// Make sure that we do so in case we're in a parent that can intercept.
|
|
if (/*(mGroupFlags & FLAG_DISALLOW_INTERCEPT) == 0 && */
|
|
Math.abs(rawDeltaY) > mTouchSlop) {
|
|
final ViewParent parent = getParent();
|
|
if (parent != null) {
|
|
parent.requestDisallowInterceptTouchEvent(true);
|
|
}
|
|
}
|
|
|
|
final int motionIndex;
|
|
if (mMotionPosition >= 0) {
|
|
motionIndex = mMotionPosition - mFirstPosition;
|
|
} else {
|
|
// If we don't have a motion position that we can reliably track,
|
|
// pick something in the middle to make a best guess at things below.
|
|
motionIndex = getChildCount() / 2;
|
|
}
|
|
|
|
// int motionViewPrevTop = 0;
|
|
View motionView = this.getChildAt(motionIndex);
|
|
// if (motionView != null) {
|
|
// motionViewPrevTop = motionView.getTop();
|
|
// }
|
|
|
|
// No need to do all this work if we're not going to move anyway
|
|
boolean atEdge = false;
|
|
if (incrementalDeltaY != 0) {
|
|
atEdge = trackMotionScroll(deltaY, incrementalDeltaY);
|
|
}
|
|
|
|
// Check to see if we have bumped into the scroll limit
|
|
motionView = this.getChildAt(motionIndex);
|
|
if (motionView != null) {
|
|
// Check if the top of the motion view is where it is
|
|
// supposed to be
|
|
// final int motionViewRealTop = motionView.getTop();
|
|
if (atEdge) {
|
|
// Apply overscroll
|
|
|
|
// int overscroll = -incrementalDeltaY -
|
|
// (motionViewRealTop - motionViewPrevTop);
|
|
// if (dispatchNestedScroll(0, overscroll - incrementalDeltaY, 0, overscroll,
|
|
// mScrollOffset)) {
|
|
// lastYCorrection -= mScrollOffset[1];
|
|
// if (vtev != null) {
|
|
// vtev.offsetLocation(0, mScrollOffset[1]);
|
|
// mNestedYOffset += mScrollOffset[1];
|
|
// }
|
|
// } else {
|
|
// final boolean atOverscrollEdge = overScrollBy(0, overscroll,
|
|
// 0, getScrollY(), 0, 0, 0, mOverscrollDistance, true);
|
|
|
|
// if (atOverscrollEdge && mVelocityTracker != null) {
|
|
// // Don't allow overfling if we're at the edge
|
|
// mVelocityTracker.clear();
|
|
// }
|
|
|
|
// final int overscrollMode = getOverScrollMode();
|
|
// if (overscrollMode == OVER_SCROLL_ALWAYS ||
|
|
// (overscrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS &&
|
|
// !contentFits())) {
|
|
// if (!atOverscrollEdge) {
|
|
// mDirection = 0; // Reset when entering overscroll.
|
|
// mTouchMode = TOUCH_MODE_OVERSCROLL;
|
|
// }
|
|
// if (incrementalDeltaY > 0) {
|
|
// mEdgeGlowTop.onPull((float) -overscroll / getHeight(),
|
|
// (float) x / getWidth());
|
|
// if (!mEdgeGlowBottom.isFinished()) {
|
|
// mEdgeGlowBottom.onRelease();
|
|
// }
|
|
// invalidateTopGlow();
|
|
// } else if (incrementalDeltaY < 0) {
|
|
// mEdgeGlowBottom.onPull((float) overscroll / getHeight(),
|
|
// 1.f - (float) x / getWidth());
|
|
// if (!mEdgeGlowTop.isFinished()) {
|
|
// mEdgeGlowTop.onRelease();
|
|
// }
|
|
// invalidateBottomGlow();
|
|
// }
|
|
// }
|
|
// }
|
|
}
|
|
mMotionY = y + lastYCorrection + scrollOffsetCorrection;
|
|
}
|
|
mLastY = y + lastYCorrection + scrollOffsetCorrection;
|
|
}
|
|
} else if (mTouchMode == TOUCH_MODE_OVERSCROLL) {
|
|
if (y != mLastY) {
|
|
final int oldScroll = getScrollY();
|
|
final int newScroll = oldScroll - incrementalDeltaY;
|
|
int newDirection = y > mLastY ? 1 : -1;
|
|
|
|
if (mDirection == 0) {
|
|
mDirection = newDirection;
|
|
}
|
|
|
|
int overScrollDistance = -incrementalDeltaY;
|
|
if ((newScroll < 0 && oldScroll >= 0) || (newScroll > 0 && oldScroll <= 0)) {
|
|
overScrollDistance = -oldScroll;
|
|
incrementalDeltaY += overScrollDistance;
|
|
} else {
|
|
incrementalDeltaY = 0;
|
|
}
|
|
|
|
// if (overScrollDistance != 0) {
|
|
// overScrollBy(0, overScrollDistance, 0, getScrollY(), 0, 0,
|
|
// 0, mOverscrollDistance, true);
|
|
// final int overscrollMode = getOverScrollMode();
|
|
// if (overscrollMode == OVER_SCROLL_ALWAYS ||
|
|
// (overscrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS &&
|
|
// !contentFits())) {
|
|
// if (rawDeltaY > 0) {
|
|
// mEdgeGlowTop.onPull((float) overScrollDistance / getHeight(),
|
|
// (float) x / getWidth());
|
|
// if (!mEdgeGlowBottom.isFinished()) {
|
|
// mEdgeGlowBottom.onRelease();
|
|
// }
|
|
// invalidateTopGlow();
|
|
// } else if (rawDeltaY < 0) {
|
|
// mEdgeGlowBottom.onPull((float) overScrollDistance / getHeight(),
|
|
// 1.f - (float) x / getWidth());
|
|
// if (!mEdgeGlowTop.isFinished()) {
|
|
// mEdgeGlowTop.onRelease();
|
|
// }
|
|
// invalidateBottomGlow();
|
|
// }
|
|
// }
|
|
// }
|
|
|
|
if (incrementalDeltaY != 0) {
|
|
// Coming back to 'real' list scrolling
|
|
if (getScrollY() != 0) {
|
|
scrollTo(getScrollX(), 0);
|
|
// invalidateParentIfNeeded();
|
|
}
|
|
|
|
trackMotionScroll(incrementalDeltaY, incrementalDeltaY);
|
|
|
|
mTouchMode = TOUCH_MODE_SCROLL;
|
|
|
|
// We did not scroll the full amount. Treat this essentially like the
|
|
// start of a new touch scroll
|
|
final int motionPosition = findClosestMotionRow(y);
|
|
|
|
mMotionCorrection = 0;
|
|
View motionView = getChildAt(motionPosition - mFirstPosition);
|
|
mMotionViewOriginalTop = motionView != null ? motionView.getTop() : 0;
|
|
mMotionY = y + scrollOffsetCorrection;
|
|
mMotionPosition = motionPosition;
|
|
}
|
|
mLastY = y + lastYCorrection + scrollOffsetCorrection;
|
|
mDirection = newDirection;
|
|
}
|
|
}
|
|
}
|
|
|
|
@Override
|
|
public void onTouchModeChanged(boolean isInTouchMode) {
|
|
if (isInTouchMode) {
|
|
// Get rid of the selection when we enter touch mode
|
|
hideSelector();
|
|
// Layout, but only if we already have done so previously.
|
|
// (Otherwise may clobber a LAYOUT_SYNC layout that was requested to restore
|
|
// state.)
|
|
if (getHeight() > 0 && getChildCount() > 0) {
|
|
// We do not lose focus initiating a touch (since AbsListView is focusable in
|
|
// touch mode). Force an initial layout to get rid of the selection.
|
|
layoutChildren();
|
|
}
|
|
updateSelectorState();
|
|
} else {
|
|
int touchMode = mTouchMode;
|
|
if (touchMode == TOUCH_MODE_OVERSCROLL || touchMode == TOUCH_MODE_OVERFLING) {
|
|
if (mFlingRunnable != null) {
|
|
mFlingRunnable.endFling();
|
|
}
|
|
if (mPositionScroller != null) {
|
|
mPositionScroller.stop();
|
|
}
|
|
|
|
if (getScrollY() != 0) {
|
|
scrollTo(getScrollX(), 0);
|
|
// invalidateParentCaches();
|
|
finishGlows();
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
@Override
|
|
public boolean onTouchEvent(MotionEvent ev) {
|
|
if (!isEnabled()) {
|
|
// A disabled view that is clickable still consumes the touch
|
|
// events, it just doesn't respond to them.
|
|
return isClickable() || isLongClickable();
|
|
}
|
|
|
|
if (mPositionScroller != null) {
|
|
mPositionScroller.stop();
|
|
}
|
|
|
|
if (mIsDetaching || !isAttachedToWindow()) {
|
|
// Something isn't right.
|
|
// Since we rely on being attached to get data set change notifications,
|
|
// don't risk doing anything where we might try to resync and find things
|
|
// in a bogus state.
|
|
return false;
|
|
}
|
|
|
|
// startNestedScroll(SCROLL_AXIS_VERTICAL);
|
|
|
|
// if (mFastScroll != null && mFastScroll.onTouchEvent(ev)) {
|
|
// return true;
|
|
// }
|
|
|
|
initVelocityTrackerIfNotExists();
|
|
final MotionEvent vtev = MotionEvent.obtain(ev);
|
|
|
|
final int actionMasked = ev.getActionMasked();
|
|
if (actionMasked == MotionEvent.ACTION_DOWN) {
|
|
mNestedYOffset = 0;
|
|
}
|
|
vtev.offsetLocation(0, mNestedYOffset);
|
|
switch (actionMasked) {
|
|
case MotionEvent.ACTION_DOWN: {
|
|
onTouchDown(ev);
|
|
break;
|
|
}
|
|
|
|
case MotionEvent.ACTION_MOVE: {
|
|
onTouchMove(ev, vtev);
|
|
break;
|
|
}
|
|
|
|
case MotionEvent.ACTION_UP: {
|
|
onTouchUp(ev);
|
|
break;
|
|
}
|
|
|
|
case MotionEvent.ACTION_CANCEL: {
|
|
onTouchCancel();
|
|
break;
|
|
}
|
|
|
|
case MotionEvent.ACTION_POINTER_UP: {
|
|
onSecondaryPointerUp(ev);
|
|
final int x = mMotionX;
|
|
final int y = mMotionY;
|
|
final int motionPosition = pointToPosition(x, y);
|
|
if (motionPosition >= 0) {
|
|
// Remember where the motion event started
|
|
final View child = getChildAt(motionPosition - mFirstPosition);
|
|
mMotionViewOriginalTop = child.getTop();
|
|
mMotionPosition = motionPosition;
|
|
}
|
|
mLastY = y;
|
|
break;
|
|
}
|
|
|
|
case MotionEvent.ACTION_POINTER_DOWN: {
|
|
// New pointers take over dragging duties
|
|
final int index = ev.getActionIndex();
|
|
final int id = ev.getPointerId(index);
|
|
final int x = (int) ev.getX(index);
|
|
final int y = (int) ev.getY(index);
|
|
mMotionCorrection = 0;
|
|
mActivePointerId = id;
|
|
mMotionX = x;
|
|
mMotionY = y;
|
|
final int motionPosition = pointToPosition(x, y);
|
|
if (motionPosition >= 0) {
|
|
// Remember where the motion event started
|
|
final View child = getChildAt(motionPosition - mFirstPosition);
|
|
mMotionViewOriginalTop = child.getTop();
|
|
mMotionPosition = motionPosition;
|
|
}
|
|
mLastY = y;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (mVelocityTracker != null) {
|
|
mVelocityTracker.addMovement(vtev);
|
|
}
|
|
vtev.recycle();
|
|
return true;
|
|
}
|
|
|
|
private void onTouchDown(MotionEvent ev) {
|
|
mActivePointerId = ev.getPointerId(0);
|
|
|
|
if (mTouchMode == TOUCH_MODE_OVERFLING) {
|
|
// Stopped the fling. It is a scroll.
|
|
mFlingRunnable.endFling();
|
|
if (mPositionScroller != null) {
|
|
mPositionScroller.stop();
|
|
}
|
|
mTouchMode = TOUCH_MODE_OVERSCROLL;
|
|
mMotionX = (int) ev.getX();
|
|
mMotionY = (int) ev.getY();
|
|
mLastY = mMotionY;
|
|
mMotionCorrection = 0;
|
|
mDirection = 0;
|
|
} else {
|
|
final int x = (int) ev.getX();
|
|
final int y = (int) ev.getY();
|
|
int motionPosition = pointToPosition(x, y);
|
|
|
|
if (!mDataChanged) {
|
|
if (mTouchMode == TOUCH_MODE_FLING) {
|
|
// Stopped a fling. It is a scroll.
|
|
createScrollingCache();
|
|
mTouchMode = TOUCH_MODE_SCROLL;
|
|
mMotionCorrection = 0;
|
|
motionPosition = findMotionRow(y);
|
|
mFlingRunnable.flywheelTouch();
|
|
} else if ((motionPosition >= 0) && getAdapter().isEnabled(motionPosition)) {
|
|
// User clicked on an actual view (and was not stopping a
|
|
// fling). It might be a click or a scroll. Assume it is a
|
|
// click until proven otherwise.
|
|
mTouchMode = TOUCH_MODE_DOWN;
|
|
|
|
// FIXME Debounce
|
|
if (mPendingCheckForTap == null) {
|
|
mPendingCheckForTap = new CheckForTap();
|
|
}
|
|
|
|
// mPendingCheckForTap.x = ev.getX();
|
|
// mPendingCheckForTap.y = ev.getY();
|
|
postDelayed(mPendingCheckForTap, ViewConfiguration.getTapTimeout());
|
|
}
|
|
}
|
|
|
|
if (motionPosition >= 0) {
|
|
// Remember where the motion event started
|
|
final View v = getChildAt(motionPosition - mFirstPosition);
|
|
mMotionViewOriginalTop = v.getTop();
|
|
}
|
|
|
|
mMotionX = x;
|
|
mMotionY = y;
|
|
mMotionPosition = motionPosition;
|
|
mLastY = Integer.MIN_VALUE;
|
|
}
|
|
|
|
// if (mTouchMode == TOUCH_MODE_DOWN && mMotionPosition != INVALID_POSITION
|
|
// && performButtonActionOnTouchDown(ev)) {
|
|
// removeCallbacks(mPendingCheckForTap);
|
|
// }
|
|
}
|
|
|
|
private void onTouchMove(MotionEvent ev, MotionEvent vtev) {
|
|
int pointerIndex = ev.findPointerIndex(mActivePointerId);
|
|
if (pointerIndex == -1) {
|
|
pointerIndex = 0;
|
|
mActivePointerId = ev.getPointerId(pointerIndex);
|
|
}
|
|
|
|
if (mDataChanged) {
|
|
// Re-sync everything if data has been changed
|
|
// since the scroll operation can query the adapter.
|
|
layoutChildren();
|
|
}
|
|
|
|
final int y = (int) ev.getY(pointerIndex);
|
|
|
|
switch (mTouchMode) {
|
|
case TOUCH_MODE_DOWN:
|
|
case TOUCH_MODE_TAP:
|
|
case TOUCH_MODE_DONE_WAITING:
|
|
// Check if we have moved far enough that it looks more like a
|
|
// scroll than a tap. If so, we'll enter scrolling mode.
|
|
if (startScrollIfNeeded((int) ev.getX(pointerIndex), y, vtev)) {
|
|
break;
|
|
}
|
|
// Otherwise, check containment within list bounds. If we're
|
|
// outside bounds, cancel any active presses.
|
|
final View motionView = getChildAt(mMotionPosition - mFirstPosition);
|
|
// final float x = ev.getX(pointerIndex);
|
|
// if (!pointInView(x, y, mTouchSlop)) {
|
|
setPressed(false);
|
|
if (motionView != null) {
|
|
motionView.setPressed(false);
|
|
}
|
|
removeCallbacks(mTouchMode == TOUCH_MODE_DOWN ?
|
|
mPendingCheckForTap : mPendingCheckForLongPress);
|
|
mTouchMode = TOUCH_MODE_DONE_WAITING;
|
|
updateSelectorState();
|
|
// } else if (motionView != null) {
|
|
// // Still within bounds, update the hotspot.
|
|
// final float[] point = mTmpPoint;
|
|
// point[0] = x;
|
|
// point[1] = y;
|
|
// transformPointToViewLocal(point, motionView);
|
|
// motionView.drawableHotspotChanged(point[0], point[1]);
|
|
// }
|
|
break;
|
|
case TOUCH_MODE_SCROLL:
|
|
case TOUCH_MODE_OVERSCROLL:
|
|
scrollIfNeeded((int) ev.getX(pointerIndex), y, vtev);
|
|
break;
|
|
}
|
|
}
|
|
|
|
private void onTouchUp(MotionEvent ev) {
|
|
switch (mTouchMode) {
|
|
case TOUCH_MODE_DOWN:
|
|
case TOUCH_MODE_TAP:
|
|
case TOUCH_MODE_DONE_WAITING:
|
|
final int motionPosition = mMotionPosition;
|
|
final View child = getChildAt(motionPosition - mFirstPosition);
|
|
if (child != null) {
|
|
if (mTouchMode != TOUCH_MODE_DOWN) {
|
|
child.setPressed(false);
|
|
}
|
|
|
|
final float x = ev.getX();
|
|
final boolean inList = x > mListPadding.left && x < getWidth() - mListPadding.right;
|
|
if (inList && !child.hasFocusable()) {
|
|
if (mPerformClick == null) {
|
|
mPerformClick = new PerformClick();
|
|
}
|
|
|
|
final AbsListView.PerformClick performClick = mPerformClick;
|
|
performClick.mClickMotionPosition = motionPosition;
|
|
// performClick.rememberWindowAttachCount();
|
|
|
|
mResurrectToPosition = motionPosition;
|
|
|
|
if (mTouchMode == TOUCH_MODE_DOWN || mTouchMode == TOUCH_MODE_TAP) {
|
|
removeCallbacks(mTouchMode == TOUCH_MODE_DOWN ?
|
|
mPendingCheckForTap : mPendingCheckForLongPress);
|
|
mLayoutMode = LAYOUT_NORMAL;
|
|
if (!mDataChanged && mAdapter.isEnabled(motionPosition)) {
|
|
mTouchMode = TOUCH_MODE_TAP;
|
|
setSelectedPositionInt(mMotionPosition);
|
|
layoutChildren();
|
|
child.setPressed(true);
|
|
positionSelector(mMotionPosition, child);
|
|
setPressed(true);
|
|
// if (mSelector != null) {
|
|
// Drawable d = mSelector.getCurrent();
|
|
// if (d != null && d instanceof TransitionDrawable) {
|
|
// ((TransitionDrawable) d).resetTransition();
|
|
// }
|
|
// mSelector.setHotspot(x, ev.getY());
|
|
// }
|
|
if (mTouchModeReset != null) {
|
|
removeCallbacks(mTouchModeReset);
|
|
}
|
|
mTouchModeReset = new Runnable() {
|
|
@Override
|
|
public void run() {
|
|
mTouchModeReset = null;
|
|
mTouchMode = TOUCH_MODE_REST;
|
|
child.setPressed(false);
|
|
setPressed(false);
|
|
if (!mDataChanged && !mIsDetaching && isAttachedToWindow()) {
|
|
performClick.run();
|
|
}
|
|
}
|
|
};
|
|
postDelayed(mTouchModeReset,
|
|
64 /* ViewConfiguration.getPressedStateDuration() */);
|
|
} else {
|
|
mTouchMode = TOUCH_MODE_REST;
|
|
updateSelectorState();
|
|
}
|
|
return;
|
|
} else if (!mDataChanged && mAdapter.isEnabled(motionPosition)) {
|
|
performClick.run();
|
|
}
|
|
}
|
|
}
|
|
mTouchMode = TOUCH_MODE_REST;
|
|
updateSelectorState();
|
|
break;
|
|
case TOUCH_MODE_SCROLL:
|
|
final int childCount = getChildCount();
|
|
if (childCount > 0) {
|
|
final int firstChildTop = getChildAt(0).getTop();
|
|
final int lastChildBottom = getChildAt(childCount - 1).getBottom();
|
|
final int contentTop = mListPadding.top;
|
|
final int contentBottom = getHeight() - mListPadding.bottom;
|
|
if (mFirstPosition == 0 && firstChildTop >= contentTop &&
|
|
mFirstPosition + childCount < mItemCount &&
|
|
lastChildBottom <= getHeight() - contentBottom) {
|
|
mTouchMode = TOUCH_MODE_REST;
|
|
reportScrollStateChange(OnScrollListener.SCROLL_STATE_IDLE);
|
|
} else {
|
|
final VelocityTracker velocityTracker = mVelocityTracker;
|
|
velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity);
|
|
|
|
final int initialVelocity = (int)
|
|
(velocityTracker.getYVelocity(mActivePointerId) * mVelocityScale);
|
|
// Fling if we have enough velocity and we aren't at a boundary.
|
|
// Since we can potentially overfling more than we can overscroll, don't
|
|
// allow the weird behavior where you can scroll to a boundary then
|
|
// fling further.
|
|
boolean flingVelocity = Math.abs(initialVelocity) > mMinimumVelocity;
|
|
if (flingVelocity &&
|
|
!((mFirstPosition == 0 &&
|
|
firstChildTop == contentTop - mOverscrollDistance) ||
|
|
(mFirstPosition + childCount == mItemCount &&
|
|
lastChildBottom == contentBottom + mOverscrollDistance))) {
|
|
// if (!dispatchNestedPreFling(0, -initialVelocity)) {
|
|
// if (mFlingRunnable == null) {
|
|
// mFlingRunnable = new FlingRunnable();
|
|
// }
|
|
// reportScrollStateChange(OnScrollListener.SCROLL_STATE_FLING);
|
|
// mFlingRunnable.start(-initialVelocity);
|
|
// dispatchNestedFling(0, -initialVelocity, true);
|
|
// } else {
|
|
mTouchMode = TOUCH_MODE_REST;
|
|
reportScrollStateChange(OnScrollListener.SCROLL_STATE_IDLE);
|
|
// }
|
|
} else {
|
|
mTouchMode = TOUCH_MODE_REST;
|
|
reportScrollStateChange(OnScrollListener.SCROLL_STATE_IDLE);
|
|
if (mFlingRunnable != null) {
|
|
mFlingRunnable.endFling();
|
|
}
|
|
if (mPositionScroller != null) {
|
|
mPositionScroller.stop();
|
|
}
|
|
// if (flingVelocity && !dispatchNestedPreFling(0, -initialVelocity)) {
|
|
// dispatchNestedFling(0, -initialVelocity, false);
|
|
// }
|
|
}
|
|
}
|
|
} else {
|
|
mTouchMode = TOUCH_MODE_REST;
|
|
reportScrollStateChange(OnScrollListener.SCROLL_STATE_IDLE);
|
|
}
|
|
break;
|
|
|
|
case TOUCH_MODE_OVERSCROLL:
|
|
if (mFlingRunnable == null) {
|
|
mFlingRunnable = new FlingRunnable();
|
|
}
|
|
final VelocityTracker velocityTracker = mVelocityTracker;
|
|
velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity);
|
|
final int initialVelocity = (int) velocityTracker.getYVelocity(mActivePointerId);
|
|
|
|
reportScrollStateChange(OnScrollListener.SCROLL_STATE_FLING);
|
|
if (Math.abs(initialVelocity) > mMinimumVelocity) {
|
|
mFlingRunnable.startOverfling(-initialVelocity);
|
|
} else {
|
|
mFlingRunnable.startSpringback();
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
setPressed(false);
|
|
|
|
if (mEdgeGlowTop != null) {
|
|
mEdgeGlowTop.onRelease();
|
|
mEdgeGlowBottom.onRelease();
|
|
}
|
|
|
|
// Need to redraw since we probably aren't drawing the selector anymore
|
|
invalidate();
|
|
removeCallbacks(mPendingCheckForLongPress);
|
|
recycleVelocityTracker();
|
|
|
|
mActivePointerId = INVALID_POINTER;
|
|
|
|
if (PROFILE_SCROLLING) {
|
|
if (mScrollProfilingStarted) {
|
|
// Debug.stopMethodTracing();
|
|
mScrollProfilingStarted = false;
|
|
}
|
|
}
|
|
}
|
|
|
|
private void onTouchCancel() {
|
|
switch (mTouchMode) {
|
|
case TOUCH_MODE_OVERSCROLL:
|
|
if (mFlingRunnable == null) {
|
|
mFlingRunnable = new FlingRunnable();
|
|
}
|
|
mFlingRunnable.startSpringback();
|
|
break;
|
|
|
|
case TOUCH_MODE_OVERFLING:
|
|
// Do nothing - let it play out.
|
|
break;
|
|
|
|
default:
|
|
mTouchMode = TOUCH_MODE_REST;
|
|
setPressed(false);
|
|
final View motionView = this.getChildAt(mMotionPosition - mFirstPosition);
|
|
if (motionView != null) {
|
|
motionView.setPressed(false);
|
|
}
|
|
clearScrollingCache();
|
|
removeCallbacks(mPendingCheckForLongPress);
|
|
recycleVelocityTracker();
|
|
}
|
|
|
|
if (mEdgeGlowTop != null) {
|
|
mEdgeGlowTop.onRelease();
|
|
mEdgeGlowBottom.onRelease();
|
|
}
|
|
mActivePointerId = INVALID_POINTER;
|
|
}
|
|
|
|
protected void onOverScrolled(int scrollX, int scrollY, boolean clampedX, boolean clampedY) {
|
|
if (getScrollY() != scrollY) {
|
|
onScrollChanged(getScrollX(), scrollY, getScrollX(), getScrollY());
|
|
scrollTo(getScrollX(), scrollY);
|
|
// invalidateParentIfNeeded();
|
|
|
|
awakenScrollBars();
|
|
}
|
|
}
|
|
|
|
@Override
|
|
public boolean onGenericMotionEvent(MotionEvent event) {
|
|
if ((event.getSource() & InputDevice.SOURCE_CLASS_POINTER) != 0) {
|
|
switch (event.getAction()) {
|
|
case MotionEvent.ACTION_SCROLL:
|
|
if (mTouchMode == TOUCH_MODE_REST) {
|
|
final float vscroll = event.getAxisValue(MotionEvent.AXIS_VSCROLL);
|
|
if (vscroll != 0) {
|
|
final int delta = (int) (vscroll * 100 /* getVerticalScrollFactor() */);
|
|
if (!trackMotionScroll(delta, delta)) {
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
|
|
// case MotionEvent.ACTION_BUTTON_PRESS:
|
|
// int actionButton = event.getActionButton();
|
|
// if ((actionButton == MotionEvent.BUTTON_STYLUS_PRIMARY
|
|
// || actionButton == MotionEvent.BUTTON_SECONDARY)
|
|
// && (mTouchMode == TOUCH_MODE_DOWN || mTouchMode == TOUCH_MODE_TAP)) {
|
|
// if (performStylusButtonPressAction(event)) {
|
|
// removeCallbacks(mPendingCheckForLongPress);
|
|
// removeCallbacks(mPendingCheckForTap);
|
|
// }
|
|
// }
|
|
// break;
|
|
}
|
|
}
|
|
|
|
return super.onGenericMotionEvent(event);
|
|
}
|
|
|
|
/**
|
|
* Initiate a fling with the given velocity.
|
|
*
|
|
* <p>Applications can use this method to manually initiate a fling as if the user
|
|
* initiated it via touch interaction.</p>
|
|
*
|
|
* @param velocityY Vertical velocity in pixels per second. Note that this is velocity of
|
|
* content, not velocity of a touch that initiated the fling.
|
|
*/
|
|
public void fling(int velocityY) {
|
|
if (mFlingRunnable == null) {
|
|
mFlingRunnable = new FlingRunnable();
|
|
}
|
|
reportScrollStateChange(OnScrollListener.SCROLL_STATE_FLING);
|
|
mFlingRunnable.start(velocityY);
|
|
}
|
|
|
|
@Override
|
|
public boolean onStartNestedScroll(View child, View target, int nestedScrollAxes) {
|
|
return ((nestedScrollAxes & 2 /*SCROLL_AXIS_VERTICAL*/) != 0);
|
|
}
|
|
|
|
// @Override
|
|
// public void onNestedScrollAccepted(View child, View target, int axes) {
|
|
// super.onNestedScrollAccepted(child, target, axes);
|
|
// startNestedScroll(SCROLL_AXIS_VERTICAL);
|
|
// }
|
|
|
|
public void onNestedScroll(View target, int dxConsumed, int dyConsumed,
|
|
int dxUnconsumed, int dyUnconsumed) {
|
|
final int motionIndex = getChildCount() / 2;
|
|
final View motionView = getChildAt(motionIndex);
|
|
// final int oldTop = motionView != null ? motionView.getTop() : 0;
|
|
if (motionView == null || trackMotionScroll(-dyUnconsumed, -dyUnconsumed)) {
|
|
// int myUnconsumed = dyUnconsumed;
|
|
// int myConsumed = 0;
|
|
// if (motionView != null) {
|
|
// myConsumed = motionView.getTop() - oldTop;
|
|
// myUnconsumed -= myConsumed;
|
|
// }
|
|
// dispatchNestedScroll(0, myConsumed, 0, myUnconsumed, null);
|
|
}
|
|
}
|
|
|
|
@Override
|
|
public boolean onNestedFling(View target, float velocityX, float velocityY, boolean consumed) {
|
|
final int childCount = getChildCount();
|
|
if (!consumed && childCount > 0 && canScrollList((int) velocityY) &&
|
|
Math.abs(velocityY) > mMinimumVelocity) {
|
|
reportScrollStateChange(OnScrollListener.SCROLL_STATE_FLING);
|
|
if (mFlingRunnable == null) {
|
|
mFlingRunnable = new FlingRunnable();
|
|
}
|
|
// if (!dispatchNestedPreFling(0, velocityY)) {
|
|
// mFlingRunnable.start((int) velocityY);
|
|
// }
|
|
return true;
|
|
}
|
|
// return dispatchNestedFling(velocityX, velocityY, consumed);
|
|
return false;
|
|
}
|
|
|
|
@Override
|
|
public void draw(Canvas canvas) {
|
|
super.draw(canvas);
|
|
if (mEdgeGlowTop != null) {
|
|
// final int scrollY = getScrollY();
|
|
// final boolean clipToPadding = false; // getClipToPadding();
|
|
// final int width;
|
|
// final int height;
|
|
// final int translateX;
|
|
// final int translateY;
|
|
|
|
// if (clipToPadding) {
|
|
// width = getWidth() - paddingLeft - paddingRight;
|
|
// height = getHeight() - paddingTop - paddingBottom;
|
|
// translateX = paddingLeft;
|
|
// translateY = paddingTop;
|
|
// } else {
|
|
// width = getWidth();
|
|
// height = getHeight();
|
|
// translateX = 0;
|
|
// translateY = 0;
|
|
// }
|
|
// if (!mEdgeGlowTop.isFinished()) {
|
|
// final int restoreCount = canvas.save();
|
|
// canvas.clipRect(translateX, translateY,
|
|
// translateX + width ,translateY + mEdgeGlowTop.getMaxHeight());
|
|
// final int edgeY = Math.min(0, scrollY + mFirstPositionDistanceGuess) + translateY;
|
|
// canvas.translate(translateX, edgeY);
|
|
// mEdgeGlowTop.setSize(width, height);
|
|
// if (mEdgeGlowTop.draw(canvas)) {
|
|
// invalidateTopGlow();
|
|
// }
|
|
// canvas.restoreToCount(restoreCount);
|
|
// }
|
|
// if (!mEdgeGlowBottom.isFinished()) {
|
|
// final int restoreCount = canvas.save();
|
|
// canvas.clipRect(translateX, translateY + height - mEdgeGlowBottom.getMaxHeight(),
|
|
// translateX + width, translateY + height);
|
|
// final int edgeX = -width + translateX;
|
|
// final int edgeY = Math.max(getHeight(), scrollY + mLastPositionDistanceGuess)
|
|
// - (clipToPadding ? paddingBottom : 0);
|
|
// canvas.translate(edgeX, edgeY);
|
|
// canvas.rotate(180, width, 0);
|
|
// mEdgeGlowBottom.setSize(width, height);
|
|
// if (mEdgeGlowBottom.draw(canvas)) {
|
|
// invalidateBottomGlow();
|
|
// }
|
|
// canvas.restoreToCount(restoreCount);
|
|
// }
|
|
}
|
|
}
|
|
|
|
private void initOrResetVelocityTracker() {
|
|
if (mVelocityTracker == null) {
|
|
mVelocityTracker = VelocityTracker.obtain();
|
|
} else {
|
|
mVelocityTracker.clear();
|
|
}
|
|
}
|
|
|
|
private void initVelocityTrackerIfNotExists() {
|
|
if (mVelocityTracker == null) {
|
|
mVelocityTracker = VelocityTracker.obtain();
|
|
}
|
|
}
|
|
|
|
private void recycleVelocityTracker() {
|
|
if (mVelocityTracker != null) {
|
|
mVelocityTracker.recycle();
|
|
mVelocityTracker = null;
|
|
}
|
|
}
|
|
|
|
@Override
|
|
public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) {
|
|
if (disallowIntercept) {
|
|
recycleVelocityTracker();
|
|
}
|
|
super.requestDisallowInterceptTouchEvent(disallowIntercept);
|
|
}
|
|
|
|
// @Override
|
|
// public boolean onInterceptHoverEvent(MotionEvent event) {
|
|
// if (mFastScroll != null && mFastScroll.onInterceptHoverEvent(event)) {
|
|
// return true;
|
|
// }
|
|
|
|
// return super.onInterceptHoverEvent(event);
|
|
// }
|
|
|
|
@Override
|
|
public boolean onInterceptTouchEvent(MotionEvent ev) {
|
|
final int actionMasked = ev.getActionMasked();
|
|
View v;
|
|
|
|
if (mPositionScroller != null) {
|
|
mPositionScroller.stop();
|
|
}
|
|
|
|
if (mIsDetaching || !isAttachedToWindow()) {
|
|
// Something isn't right.
|
|
// Since we rely on being attached to get data set change notifications,
|
|
// don't risk doing anything where we might try to resync and find things
|
|
// in a bogus state.
|
|
return false;
|
|
}
|
|
|
|
// if (mFastScroll != null && mFastScroll.onInterceptTouchEvent(ev)) {
|
|
// return true;
|
|
// }
|
|
|
|
switch (actionMasked) {
|
|
case MotionEvent.ACTION_DOWN: {
|
|
int touchMode = mTouchMode;
|
|
if (touchMode == TOUCH_MODE_OVERFLING || touchMode == TOUCH_MODE_OVERSCROLL) {
|
|
mMotionCorrection = 0;
|
|
return true;
|
|
}
|
|
|
|
final int x = (int) ev.getX();
|
|
final int y = (int) ev.getY();
|
|
mActivePointerId = ev.getPointerId(0);
|
|
|
|
int motionPosition = findMotionRow(y);
|
|
if (touchMode != TOUCH_MODE_FLING && motionPosition >= 0) {
|
|
// User clicked on an actual view (and was not stopping a fling).
|
|
// Remember where the motion event started
|
|
v = getChildAt(motionPosition - mFirstPosition);
|
|
mMotionViewOriginalTop = v.getTop();
|
|
mMotionX = x;
|
|
mMotionY = y;
|
|
mMotionPosition = motionPosition;
|
|
mTouchMode = TOUCH_MODE_DOWN;
|
|
clearScrollingCache();
|
|
}
|
|
mLastY = Integer.MIN_VALUE;
|
|
initOrResetVelocityTracker();
|
|
mVelocityTracker.addMovement(ev);
|
|
mNestedYOffset = 0;
|
|
// startNestedScroll(SCROLL_AXIS_VERTICAL);
|
|
if (touchMode == TOUCH_MODE_FLING) {
|
|
return true;
|
|
}
|
|
break;
|
|
}
|
|
|
|
case MotionEvent.ACTION_MOVE: {
|
|
switch (mTouchMode) {
|
|
case TOUCH_MODE_DOWN:
|
|
int pointerIndex = ev.findPointerIndex(mActivePointerId);
|
|
if (pointerIndex == -1) {
|
|
pointerIndex = 0;
|
|
mActivePointerId = ev.getPointerId(pointerIndex);
|
|
}
|
|
final int y = (int) ev.getY(pointerIndex);
|
|
initVelocityTrackerIfNotExists();
|
|
mVelocityTracker.addMovement(ev);
|
|
if (startScrollIfNeeded((int) ev.getX(pointerIndex), y, null)) {
|
|
return true;
|
|
}
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
|
|
case MotionEvent.ACTION_CANCEL:
|
|
case MotionEvent.ACTION_UP: {
|
|
// mTouchMode = TOUCH_MODE_REST;
|
|
mActivePointerId = INVALID_POINTER;
|
|
recycleVelocityTracker();
|
|
reportScrollStateChange(OnScrollListener.SCROLL_STATE_IDLE);
|
|
stopNestedScroll();
|
|
break;
|
|
}
|
|
|
|
case MotionEvent.ACTION_POINTER_UP: {
|
|
onSecondaryPointerUp(ev);
|
|
break;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
private void onSecondaryPointerUp(MotionEvent ev) {
|
|
final int pointerIndex = (ev.getAction() & MotionEvent.ACTION_POINTER_INDEX_MASK) >>
|
|
MotionEvent.ACTION_POINTER_INDEX_SHIFT;
|
|
final int pointerId = ev.getPointerId(pointerIndex);
|
|
if (pointerId == mActivePointerId) {
|
|
// This was our active pointer going up. Choose a new
|
|
// active pointer and adjust accordingly.
|
|
// TODO: Make this decision more intelligent.
|
|
final int newPointerIndex = pointerIndex == 0 ? 1 : 0;
|
|
mMotionX = (int) ev.getX(newPointerIndex);
|
|
mMotionY = (int) ev.getY(newPointerIndex);
|
|
mMotionCorrection = 0;
|
|
mActivePointerId = ev.getPointerId(newPointerIndex);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Fires an "on scroll state changed" event to the registered
|
|
* {@link android.widget.AbsListView.OnScrollListener}, if any. The state change
|
|
* is fired only if the specified state is different from the previously known state.
|
|
*
|
|
* @param newState The new scroll state.
|
|
*/
|
|
void reportScrollStateChange(int newState) {
|
|
if (newState != mLastScrollState) {
|
|
if (mOnScrollListener != null) {
|
|
mLastScrollState = newState;
|
|
mOnScrollListener.onScrollStateChanged(this, newState);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Responsible for fling behavior. Use {@link #start(int)} to
|
|
* initiate a fling. Each frame of the fling is handled in {@link #run()}.
|
|
* A FlingRunnable will keep re-posting itself until the fling is done.
|
|
*
|
|
*/
|
|
private class FlingRunnable implements Runnable {
|
|
/**
|
|
* Tracks the decay of a fling scroll
|
|
*/
|
|
private final OverScroller mScroller;
|
|
|
|
/**
|
|
* Y value reported by mScroller on the previous fling
|
|
*/
|
|
private int mLastFlingY;
|
|
|
|
private final Runnable mCheckFlywheel = new Runnable() {
|
|
@Override
|
|
public void run() {
|
|
final int activeId = mActivePointerId;
|
|
final VelocityTracker vt = mVelocityTracker;
|
|
final OverScroller scroller = mScroller;
|
|
if (vt == null || activeId == INVALID_POINTER) {
|
|
return;
|
|
}
|
|
|
|
vt.computeCurrentVelocity(1000, mMaximumVelocity);
|
|
final float yvel = -vt.getYVelocity(activeId);
|
|
|
|
if (Math.abs(yvel) >= mMinimumVelocity
|
|
&& scroller.isScrollingInDirection(0, yvel)) {
|
|
// Keep the fling alive a little longer
|
|
postDelayed(this, FLYWHEEL_TIMEOUT);
|
|
} else {
|
|
endFling();
|
|
mTouchMode = TOUCH_MODE_SCROLL;
|
|
reportScrollStateChange(OnScrollListener.SCROLL_STATE_TOUCH_SCROLL);
|
|
}
|
|
}
|
|
};
|
|
|
|
private static final int FLYWHEEL_TIMEOUT = 40; // milliseconds
|
|
|
|
FlingRunnable() {
|
|
mScroller = new OverScroller(getContext());
|
|
}
|
|
|
|
void start(int initialVelocity) {
|
|
int initialY = initialVelocity < 0 ? Integer.MAX_VALUE : 0;
|
|
mLastFlingY = initialY;
|
|
mScroller.setInterpolator(null);
|
|
mScroller.fling(0, initialY, 0, initialVelocity,
|
|
0, Integer.MAX_VALUE, 0, Integer.MAX_VALUE);
|
|
mTouchMode = TOUCH_MODE_FLING;
|
|
postOnAnimation(this);
|
|
|
|
if (PROFILE_FLINGING) {
|
|
if (!mFlingProfilingStarted) {
|
|
// Debug.startMethodTracing("AbsListViewFling");
|
|
mFlingProfilingStarted = true;
|
|
}
|
|
}
|
|
}
|
|
|
|
void startSpringback() {
|
|
if (mScroller.springBack(0, getScrollY(), 0, 0, 0, 0)) {
|
|
mTouchMode = TOUCH_MODE_OVERFLING;
|
|
invalidate();
|
|
postOnAnimation(this);
|
|
} else {
|
|
mTouchMode = TOUCH_MODE_REST;
|
|
reportScrollStateChange(OnScrollListener.SCROLL_STATE_IDLE);
|
|
}
|
|
}
|
|
|
|
void startOverfling(int initialVelocity) {
|
|
mScroller.setInterpolator(null);
|
|
mScroller.fling(0, getScrollY(), 0, initialVelocity, 0, 0,
|
|
Integer.MIN_VALUE, Integer.MAX_VALUE, 0, getHeight());
|
|
mTouchMode = TOUCH_MODE_OVERFLING;
|
|
invalidate();
|
|
postOnAnimation(this);
|
|
}
|
|
|
|
void edgeReached(int delta) {
|
|
mScroller.notifyVerticalEdgeReached(getScrollY(), 0, mOverflingDistance);
|
|
final int overscrollMode = getOverScrollMode();
|
|
if (overscrollMode == 0/*OVER_SCROLL_ALWAYS*/ ||
|
|
(overscrollMode == 1/*OVER_SCROLL_IF_CONTENT_SCROLLS*/ && !contentFits())) {
|
|
mTouchMode = TOUCH_MODE_OVERFLING;
|
|
final int vel = (int) mScroller.getCurrVelocity();
|
|
if (delta > 0) {
|
|
mEdgeGlowTop.onAbsorb(vel);
|
|
} else {
|
|
mEdgeGlowBottom.onAbsorb(vel);
|
|
}
|
|
} else {
|
|
mTouchMode = TOUCH_MODE_REST;
|
|
if (mPositionScroller != null) {
|
|
mPositionScroller.stop();
|
|
}
|
|
}
|
|
invalidate();
|
|
postOnAnimation(this);
|
|
}
|
|
|
|
void startScroll(int distance, int duration, boolean linear) {
|
|
int initialY = distance < 0 ? Integer.MAX_VALUE : 0;
|
|
mLastFlingY = initialY;
|
|
mScroller.setInterpolator(linear ? sLinearInterpolator : null);
|
|
mScroller.startScroll(0, initialY, 0, distance, duration);
|
|
mTouchMode = TOUCH_MODE_FLING;
|
|
postOnAnimation(this);
|
|
}
|
|
|
|
void endFling() {
|
|
mTouchMode = TOUCH_MODE_REST;
|
|
|
|
removeCallbacks(this);
|
|
removeCallbacks(mCheckFlywheel);
|
|
|
|
reportScrollStateChange(OnScrollListener.SCROLL_STATE_IDLE);
|
|
clearScrollingCache();
|
|
mScroller.abortAnimation();
|
|
}
|
|
|
|
void flywheelTouch() {
|
|
postDelayed(mCheckFlywheel, FLYWHEEL_TIMEOUT);
|
|
}
|
|
|
|
@Override
|
|
public void run() {
|
|
switch (mTouchMode) {
|
|
default:
|
|
endFling();
|
|
return;
|
|
|
|
case TOUCH_MODE_SCROLL:
|
|
if (mScroller.isFinished()) {
|
|
return;
|
|
}
|
|
// Fall through
|
|
case TOUCH_MODE_FLING: {
|
|
if (mDataChanged) {
|
|
layoutChildren();
|
|
}
|
|
|
|
if (mItemCount == 0 || getChildCount() == 0) {
|
|
endFling();
|
|
return;
|
|
}
|
|
|
|
final OverScroller scroller = mScroller;
|
|
boolean more = scroller.computeScrollOffset();
|
|
final int y = scroller.getCurrY();
|
|
|
|
// Flip sign to convert finger direction to list items direction
|
|
// (e.g. finger moving down means list is moving towards the top)
|
|
int delta = mLastFlingY - y;
|
|
|
|
// Pretend that each frame of a fling scroll is a touch scroll
|
|
if (delta > 0) {
|
|
// List is moving towards the top. Use first view as mMotionPosition
|
|
mMotionPosition = mFirstPosition;
|
|
final View firstView = getChildAt(0);
|
|
mMotionViewOriginalTop = firstView.getTop();
|
|
|
|
// Don't fling more than 1 screen
|
|
delta = Math.min(getHeight() - paddingBottom - paddingTop - 1, delta);
|
|
} else {
|
|
// List is moving towards the bottom. Use last view as mMotionPosition
|
|
int offsetToLast = getChildCount() - 1;
|
|
mMotionPosition = mFirstPosition + offsetToLast;
|
|
|
|
final View lastView = getChildAt(offsetToLast);
|
|
mMotionViewOriginalTop = lastView.getTop();
|
|
|
|
// Don't fling more than 1 screen
|
|
delta = Math.max(-(getHeight() - paddingBottom - paddingTop - 1), delta);
|
|
}
|
|
|
|
// Check to see if we have bumped into the scroll limit
|
|
View motionView = getChildAt(mMotionPosition - mFirstPosition);
|
|
// int oldTop = 0;
|
|
// if (motionView != null) {
|
|
// oldTop = motionView.getTop();
|
|
// }
|
|
|
|
// Don't stop just because delta is zero (it could have been rounded)
|
|
final boolean atEdge = trackMotionScroll(delta, delta);
|
|
final boolean atEnd = atEdge && (delta != 0);
|
|
if (atEnd) {
|
|
if (motionView != null) {
|
|
// Tweak the scroll for how far we overshot
|
|
// int overshoot = -(delta - (motionView.getTop() - oldTop));
|
|
// overScrollBy(0, overshoot, 0, getScrollY(), 0, 0,
|
|
// 0, mOverflingDistance, false);
|
|
}
|
|
if (more) {
|
|
edgeReached(delta);
|
|
}
|
|
break;
|
|
}
|
|
|
|
if (more && !atEnd) {
|
|
if (atEdge) invalidate();
|
|
mLastFlingY = y;
|
|
postOnAnimation(this);
|
|
} else {
|
|
endFling();
|
|
|
|
if (PROFILE_FLINGING) {
|
|
if (mFlingProfilingStarted) {
|
|
// Debug.stopMethodTracing();
|
|
mFlingProfilingStarted = false;
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
|
|
case TOUCH_MODE_OVERFLING: {
|
|
final OverScroller scroller = mScroller;
|
|
if (scroller.computeScrollOffset()) {
|
|
// final int scrollY = getScrollY();
|
|
// final int currY = scroller.getCurrY();
|
|
// final int deltaY = currY - scrollY;
|
|
// if (overScrollBy(0, deltaY, 0, scrollY, 0, 0,
|
|
// 0, mOverflingDistance, false)) {
|
|
// final boolean crossDown = scrollY <= 0 && currY > 0;
|
|
// final boolean crossUp = scrollY >= 0 && currY < 0;
|
|
// if (crossDown || crossUp) {
|
|
// int velocity = (int) scroller.getCurrVelocity();
|
|
// if (crossUp) velocity = -velocity;
|
|
|
|
// // Don't flywheel from this; we're just continuing things.
|
|
// scroller.abortAnimation();
|
|
// start(velocity);
|
|
// } else {
|
|
// startSpringback();
|
|
// }
|
|
// } else {
|
|
invalidate();
|
|
postOnAnimation(this);
|
|
// }
|
|
} else {
|
|
endFling();
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* The amount of friction applied to flings. The default value
|
|
* is {@link ViewConfiguration#getScrollFriction}.
|
|
*/
|
|
public void setFriction(float friction) {
|
|
if (mFlingRunnable == null) {
|
|
mFlingRunnable = new FlingRunnable();
|
|
}
|
|
mFlingRunnable.mScroller.setFriction(friction);
|
|
}
|
|
|
|
/**
|
|
* Sets a scale factor for the fling velocity. The initial scale
|
|
* factor is 1.0.
|
|
*
|
|
* @param scale The scale factor to multiply the velocity by.
|
|
*/
|
|
public void setVelocityScale(float scale) {
|
|
mVelocityScale = scale;
|
|
}
|
|
|
|
/**
|
|
* Override this for better control over position scrolling.
|
|
*/
|
|
AbsPositionScroller createPositionScroller() {
|
|
return new PositionScroller();
|
|
}
|
|
|
|
/**
|
|
* Smoothly scroll to the specified adapter position. The view will
|
|
* scroll such that the indicated position is displayed.
|
|
* @param position Scroll to this adapter position.
|
|
*/
|
|
public void smoothScrollToPosition(int position) {
|
|
if (mPositionScroller == null) {
|
|
mPositionScroller = createPositionScroller();
|
|
}
|
|
mPositionScroller.start(position);
|
|
}
|
|
|
|
/**
|
|
* Smoothly scroll to the specified adapter position. The view will scroll
|
|
* such that the indicated position is displayed <code>offset</code> pixels below
|
|
* the top edge of the view. If this is impossible, (e.g. the offset would scroll
|
|
* the first or last item beyond the boundaries of the list) it will get as close
|
|
* as possible. The scroll will take <code>duration</code> milliseconds to complete.
|
|
*
|
|
* @param position Position to scroll to
|
|
* @param offset Desired distance in pixels of <code>position</code> from the top
|
|
* of the view when scrolling is finished
|
|
* @param duration Number of milliseconds to use for the scroll
|
|
*/
|
|
public void smoothScrollToPositionFromTop(int position, int offset, int duration) {
|
|
if (mPositionScroller == null) {
|
|
mPositionScroller = createPositionScroller();
|
|
}
|
|
mPositionScroller.startWithOffset(position, offset, duration);
|
|
}
|
|
|
|
/**
|
|
* Smoothly scroll to the specified adapter position. The view will scroll
|
|
* such that the indicated position is displayed <code>offset</code> pixels below
|
|
* the top edge of the view. If this is impossible, (e.g. the offset would scroll
|
|
* the first or last item beyond the boundaries of the list) it will get as close
|
|
* as possible.
|
|
*
|
|
* @param position Position to scroll to
|
|
* @param offset Desired distance in pixels of <code>position</code> from the top
|
|
* of the view when scrolling is finished
|
|
*/
|
|
public void smoothScrollToPositionFromTop(int position, int offset) {
|
|
if (mPositionScroller == null) {
|
|
mPositionScroller = createPositionScroller();
|
|
}
|
|
mPositionScroller.startWithOffset(position, offset);
|
|
}
|
|
|
|
/**
|
|
* Smoothly scroll to the specified adapter position. The view will
|
|
* scroll such that the indicated position is displayed, but it will
|
|
* stop early if scrolling further would scroll boundPosition out of
|
|
* view.
|
|
*
|
|
* @param position Scroll to this adapter position.
|
|
* @param boundPosition Do not scroll if it would move this adapter
|
|
* position out of view.
|
|
*/
|
|
public void smoothScrollToPosition(int position, int boundPosition) {
|
|
if (mPositionScroller == null) {
|
|
mPositionScroller = createPositionScroller();
|
|
}
|
|
mPositionScroller.start(position, boundPosition);
|
|
}
|
|
|
|
/**
|
|
* Smoothly scroll by distance pixels over duration milliseconds.
|
|
* @param distance Distance to scroll in pixels.
|
|
* @param duration Duration of the scroll animation in milliseconds.
|
|
*/
|
|
public void smoothScrollBy(int distance, int duration) {
|
|
smoothScrollBy(distance, duration, false);
|
|
}
|
|
|
|
void smoothScrollBy(int distance, int duration, boolean linear) {
|
|
if (mFlingRunnable == null) {
|
|
mFlingRunnable = new FlingRunnable();
|
|
}
|
|
|
|
// No sense starting to scroll if we're not going anywhere
|
|
final int firstPos = mFirstPosition;
|
|
final int childCount = getChildCount();
|
|
final int lastPos = firstPos + childCount;
|
|
final int topLimit = getPaddingTop();
|
|
final int bottomLimit = getHeight() - getPaddingBottom();
|
|
|
|
if (distance == 0 || mItemCount == 0 || childCount == 0 ||
|
|
(firstPos == 0 && getChildAt(0).getTop() == topLimit && distance < 0) ||
|
|
(lastPos == mItemCount &&
|
|
getChildAt(childCount - 1).getBottom() == bottomLimit && distance > 0)) {
|
|
mFlingRunnable.endFling();
|
|
if (mPositionScroller != null) {
|
|
mPositionScroller.stop();
|
|
}
|
|
} else {
|
|
reportScrollStateChange(OnScrollListener.SCROLL_STATE_FLING);
|
|
mFlingRunnable.startScroll(distance, duration, linear);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Allows RemoteViews to scroll relatively to a position.
|
|
*/
|
|
void smoothScrollByOffset(int position) {
|
|
int index = -1;
|
|
if (position < 0) {
|
|
index = getFirstVisiblePosition();
|
|
} else if (position > 0) {
|
|
index = getLastVisiblePosition();
|
|
}
|
|
|
|
if (index > -1) {
|
|
View child = getChildAt(index - getFirstVisiblePosition());
|
|
if (child != null) {
|
|
Rect visibleRect = new Rect();
|
|
if (child.getGlobalVisibleRect(visibleRect)) {
|
|
// the child is partially visible
|
|
int childRectArea = child.getWidth() * child.getHeight();
|
|
int visibleRectArea = visibleRect.width() * visibleRect.height();
|
|
float visibleArea = (visibleRectArea / (float) childRectArea);
|
|
final float visibleThreshold = 0.75f;
|
|
if ((position < 0) && (visibleArea < visibleThreshold)) {
|
|
// the top index is not perceivably visible so offset
|
|
// to account for showing that top index as well
|
|
++index;
|
|
} else if ((position > 0) && (visibleArea < visibleThreshold)) {
|
|
// the bottom index is not perceivably visible so offset
|
|
// to account for showing that bottom index as well
|
|
--index;
|
|
}
|
|
}
|
|
smoothScrollToPosition(Math.max(0, Math.min(getCount(), index + position)));
|
|
}
|
|
}
|
|
}
|
|
|
|
private void createScrollingCache() {
|
|
// if (mScrollingCacheEnabled && !mCachingStarted && !isHardwareAccelerated()) {
|
|
// setChildrenDrawnWithCacheEnabled(true);
|
|
// setChildrenDrawingCacheEnabled(true);
|
|
// mCachingStarted = mCachingActive = true;
|
|
// }
|
|
}
|
|
|
|
private void clearScrollingCache() {
|
|
// if (!isHardwareAccelerated()) {
|
|
// if (mClearScrollingCache == null) {
|
|
// mClearScrollingCache = new Runnable() {
|
|
// @Override
|
|
// public void run() {
|
|
// if (mCachingStarted) {
|
|
// mCachingStarted = mCachingActive = false;
|
|
// setChildrenDrawnWithCacheEnabled(false);
|
|
// if ((mPersistentDrawingCache & PERSISTENT_SCROLLING_CACHE) == 0) {
|
|
// setChildrenDrawingCacheEnabled(false);
|
|
// }
|
|
// if (!isAlwaysDrawnWithCacheEnabled()) {
|
|
// invalidate();
|
|
// }
|
|
// }
|
|
// }
|
|
// };
|
|
// }
|
|
// post(mClearScrollingCache);
|
|
// }
|
|
}
|
|
|
|
/**
|
|
* Scrolls the list items within the view by a specified number of pixels.
|
|
*
|
|
* @param y the amount of pixels to scroll by vertically
|
|
* @see #canScrollList(int)
|
|
*/
|
|
public void scrollListBy(int y) {
|
|
trackMotionScroll(-y, -y);
|
|
}
|
|
|
|
/**
|
|
* Check if the items in the list can be scrolled in a certain direction.
|
|
*
|
|
* @param direction Negative to check scrolling up, positive to check
|
|
* scrolling down.
|
|
* @return true if the list can be scrolled in the specified direction,
|
|
* false otherwise.
|
|
* @see #scrollListBy(int)
|
|
*/
|
|
public boolean canScrollList(int direction) {
|
|
final int childCount = getChildCount();
|
|
if (childCount == 0) {
|
|
return false;
|
|
}
|
|
|
|
final int firstPosition = mFirstPosition;
|
|
final Rect listPadding = mListPadding;
|
|
if (direction > 0) {
|
|
final int lastBottom = getChildAt(childCount - 1).getBottom();
|
|
final int lastPosition = firstPosition + childCount;
|
|
return lastPosition < mItemCount || lastBottom > getHeight() - listPadding.bottom;
|
|
} else {
|
|
final int firstTop = getChildAt(0).getTop();
|
|
return firstPosition > 0 || firstTop < listPadding.top;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Track a motion scroll
|
|
*
|
|
* @param deltaY Amount to offset mMotionView. This is the accumulated delta since the motion
|
|
* began. Positive numbers mean the user's finger is moving down the screen.
|
|
* @param incrementalDeltaY Change in deltaY from the previous event.
|
|
* @return true if we're already at the beginning/end of the list and have nothing to do.
|
|
*/
|
|
boolean trackMotionScroll(int deltaY, int incrementalDeltaY) {
|
|
final int childCount = getChildCount();
|
|
if (childCount == 0) {
|
|
return true;
|
|
}
|
|
|
|
final int firstTop = getChildAt(0).getTop();
|
|
final int lastBottom = getChildAt(childCount - 1).getBottom();
|
|
|
|
final Rect listPadding = mListPadding;
|
|
|
|
// "effective padding" In this case is the amount of padding that affects
|
|
// how much space should not be filled by items. If we don't clip to padding
|
|
// there is no effective padding.
|
|
int effectivePaddingTop = 0;
|
|
int effectivePaddingBottom = 0;
|
|
// if ((mGroupFlags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK) {
|
|
// effectivePaddingTop = listPadding.top;
|
|
// effectivePaddingBottom = listPadding.bottom;
|
|
// }
|
|
|
|
// FIXME account for grid vertical spacing too?
|
|
final int spaceAbove = effectivePaddingTop - firstTop;
|
|
final int end = getHeight() - effectivePaddingBottom;
|
|
final int spaceBelow = lastBottom - end;
|
|
|
|
final int height = getHeight() - paddingBottom - paddingTop;
|
|
if (deltaY < 0) {
|
|
deltaY = Math.max(-(height - 1), deltaY);
|
|
} else {
|
|
deltaY = Math.min(height - 1, deltaY);
|
|
}
|
|
|
|
if (incrementalDeltaY < 0) {
|
|
incrementalDeltaY = Math.max(-(height - 1), incrementalDeltaY);
|
|
} else {
|
|
incrementalDeltaY = Math.min(height - 1, incrementalDeltaY);
|
|
}
|
|
|
|
final int firstPosition = mFirstPosition;
|
|
|
|
// Update our guesses for where the first and last views are
|
|
// if (firstPosition == 0) {
|
|
// mFirstPositionDistanceGuess = firstTop - listPadding.top;
|
|
// } else {
|
|
// mFirstPositionDistanceGuess += incrementalDeltaY;
|
|
// }
|
|
// if (firstPosition + childCount == mItemCount) {
|
|
// mLastPositionDistanceGuess = lastBottom + listPadding.bottom;
|
|
// } else {
|
|
// mLastPositionDistanceGuess += incrementalDeltaY;
|
|
// }
|
|
|
|
final boolean cannotScrollDown = (firstPosition == 0 &&
|
|
firstTop >= listPadding.top && incrementalDeltaY >= 0);
|
|
final boolean cannotScrollUp = (firstPosition + childCount == mItemCount &&
|
|
lastBottom <= getHeight() - listPadding.bottom && incrementalDeltaY <= 0);
|
|
|
|
if (cannotScrollDown || cannotScrollUp) {
|
|
return incrementalDeltaY != 0;
|
|
}
|
|
|
|
final boolean down = incrementalDeltaY < 0;
|
|
|
|
final boolean inTouchMode = isInTouchMode();
|
|
if (inTouchMode) {
|
|
hideSelector();
|
|
}
|
|
|
|
final int headerViewsCount = getHeaderViewsCount();
|
|
final int footerViewsStart = mItemCount - getFooterViewsCount();
|
|
|
|
int start = 0;
|
|
int count = 0;
|
|
|
|
if (down) {
|
|
int top = -incrementalDeltaY;
|
|
// if ((mGroupFlags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK) {
|
|
// top += listPadding.top;
|
|
// }
|
|
for (int i = 0; i < childCount; i++) {
|
|
final View child = getChildAt(i);
|
|
if (child.getBottom() >= top) {
|
|
break;
|
|
} else {
|
|
count++;
|
|
int position = firstPosition + i;
|
|
if (position >= headerViewsCount && position < footerViewsStart) {
|
|
// The view will be rebound to new data, clear any
|
|
// system-managed transient state.
|
|
mRecycler.addScrapView(child, position);
|
|
}
|
|
}
|
|
}
|
|
} else {
|
|
int bottom = getHeight() - incrementalDeltaY;
|
|
// if ((mGroupFlags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK) {
|
|
// bottom -= listPadding.bottom;
|
|
// }
|
|
for (int i = childCount - 1; i >= 0; i--) {
|
|
final View child = getChildAt(i);
|
|
if (child.getTop() <= bottom) {
|
|
break;
|
|
} else {
|
|
start = i;
|
|
count++;
|
|
int position = firstPosition + i;
|
|
if (position >= headerViewsCount && position < footerViewsStart) {
|
|
// The view will be rebound to new data, clear any
|
|
// system-managed transient state.
|
|
mRecycler.addScrapView(child, position);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
mMotionViewNewTop = mMotionViewOriginalTop + deltaY;
|
|
|
|
mBlockLayoutRequests = true;
|
|
|
|
if (count > 0) {
|
|
// detachViewsFromParent(start, count);
|
|
for (int i = start + count - 1; i >= start; i--) {
|
|
detachViewFromParent(i);
|
|
}
|
|
mRecycler.removeSkippedScrap();
|
|
}
|
|
|
|
// invalidate before moving the children to avoid unnecessary invalidate
|
|
// calls to bubble up from the children all the way to the top
|
|
if (!awakenScrollBars()) {
|
|
invalidate();
|
|
}
|
|
|
|
// offsetChildrenTopAndBottom(incrementalDeltaY);
|
|
for (int i = getChildCount() - 1; i >= 0; i--) {
|
|
getChildAt(i).offsetTopAndBottom(incrementalDeltaY);
|
|
}
|
|
|
|
if (down) {
|
|
mFirstPosition += count;
|
|
}
|
|
|
|
final int absIncrementalDeltaY = Math.abs(incrementalDeltaY);
|
|
if (spaceAbove < absIncrementalDeltaY || spaceBelow < absIncrementalDeltaY) {
|
|
fillGap(down);
|
|
}
|
|
|
|
if (!inTouchMode && mSelectedPosition != INVALID_POSITION) {
|
|
final int childIndex = mSelectedPosition - mFirstPosition;
|
|
if (childIndex >= 0 && childIndex < getChildCount()) {
|
|
positionSelector(mSelectedPosition, getChildAt(childIndex));
|
|
}
|
|
} else if (mSelectorPosition != INVALID_POSITION) {
|
|
final int childIndex = mSelectorPosition - mFirstPosition;
|
|
if (childIndex >= 0 && childIndex < getChildCount()) {
|
|
positionSelector(INVALID_POSITION, getChildAt(childIndex));
|
|
}
|
|
} else {
|
|
mSelectorRect.setEmpty();
|
|
}
|
|
|
|
mBlockLayoutRequests = false;
|
|
|
|
invokeOnItemScrollListener();
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Returns the number of header views in the list. Header views are special views
|
|
* at the top of the list that should not be recycled during a layout.
|
|
*
|
|
* @return The number of header views, 0 in the default implementation.
|
|
*/
|
|
int getHeaderViewsCount() {
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Returns the number of footer views in the list. Footer views are special views
|
|
* at the bottom of the list that should not be recycled during a layout.
|
|
*
|
|
* @return The number of footer views, 0 in the default implementation.
|
|
*/
|
|
int getFooterViewsCount() {
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Fills the gap left open by a touch-scroll. During a touch scroll, children that
|
|
* remain on screen are shifted and the other ones are discarded. The role of this
|
|
* method is to fill the gap thus created by performing a partial layout in the
|
|
* empty space.
|
|
*
|
|
* @param down true if the scroll is going down, false if it is going up
|
|
*/
|
|
abstract void fillGap(boolean down);
|
|
|
|
void hideSelector() {
|
|
if (mSelectedPosition != INVALID_POSITION) {
|
|
if (mLayoutMode != LAYOUT_SPECIFIC) {
|
|
mResurrectToPosition = mSelectedPosition;
|
|
}
|
|
if (mNextSelectedPosition >= 0 && mNextSelectedPosition != mSelectedPosition) {
|
|
mResurrectToPosition = mNextSelectedPosition;
|
|
}
|
|
setSelectedPositionInt(INVALID_POSITION);
|
|
setNextSelectedPositionInt(INVALID_POSITION);
|
|
mSelectedTop = 0;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @return A position to select. First we try mSelectedPosition. If that has been clobbered by
|
|
* entering touch mode, we then try mResurrectToPosition. Values are pinned to the range
|
|
* of items available in the adapter
|
|
*/
|
|
int reconcileSelectedPosition() {
|
|
int position = mSelectedPosition;
|
|
if (position < 0) {
|
|
position = mResurrectToPosition;
|
|
}
|
|
position = Math.max(0, position);
|
|
position = Math.min(position, mItemCount - 1);
|
|
return position;
|
|
}
|
|
|
|
/**
|
|
* Find the row closest to y. This row will be used as the motion row when scrolling
|
|
*
|
|
* @param y Where the user touched
|
|
* @return The position of the first (or only) item in the row containing y
|
|
*/
|
|
abstract int findMotionRow(int y);
|
|
|
|
/**
|
|
* Find the row closest to y. This row will be used as the motion row when scrolling.
|
|
*
|
|
* @param y Where the user touched
|
|
* @return The position of the first (or only) item in the row closest to y
|
|
*/
|
|
int findClosestMotionRow(int y) {
|
|
final int childCount = getChildCount();
|
|
if (childCount == 0) {
|
|
return INVALID_POSITION;
|
|
}
|
|
|
|
final int motionRow = findMotionRow(y);
|
|
return motionRow != INVALID_POSITION ? motionRow : mFirstPosition + childCount - 1;
|
|
}
|
|
|
|
/**
|
|
* Causes all the views to be rebuilt and redrawn.
|
|
*/
|
|
public void invalidateViews() {
|
|
mDataChanged = true;
|
|
rememberSyncState();
|
|
requestLayout();
|
|
invalidate();
|
|
}
|
|
|
|
/**
|
|
* If there is a selection returns false.
|
|
* Otherwise resurrects the selection and returns true if resurrected.
|
|
*/
|
|
boolean resurrectSelectionIfNeeded() {
|
|
if (mSelectedPosition < 0 && resurrectSelection()) {
|
|
updateSelectorState();
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Makes the item at the supplied position selected.
|
|
*
|
|
* @param position the position of the new selection
|
|
*/
|
|
abstract void setSelectionInt(int position);
|
|
|
|
/**
|
|
* Attempt to bring the selection back if the user is switching from touch
|
|
* to trackball mode
|
|
* @return Whether selection was set to something.
|
|
*/
|
|
boolean resurrectSelection() {
|
|
final int childCount = getChildCount();
|
|
|
|
if (childCount <= 0) {
|
|
return false;
|
|
}
|
|
|
|
int selectedTop = 0;
|
|
int selectedPos;
|
|
int childrenTop = mListPadding.top;
|
|
int childrenBottom = getBottom() - getTop() - mListPadding.bottom;
|
|
final int firstPosition = mFirstPosition;
|
|
final int toPosition = mResurrectToPosition;
|
|
boolean down = true;
|
|
|
|
if (toPosition >= firstPosition && toPosition < firstPosition + childCount) {
|
|
selectedPos = toPosition;
|
|
|
|
final View selected = getChildAt(selectedPos - mFirstPosition);
|
|
selectedTop = selected.getTop();
|
|
int selectedBottom = selected.getBottom();
|
|
|
|
// We are scrolled, don't get in the fade
|
|
if (selectedTop < childrenTop) {
|
|
selectedTop = childrenTop /*+ getVerticalFadingEdgeLength()*/;
|
|
} else if (selectedBottom > childrenBottom) {
|
|
selectedTop = childrenBottom - selected.getMeasuredHeight()
|
|
/*- getVerticalFadingEdgeLength()*/;
|
|
}
|
|
} else {
|
|
if (toPosition < firstPosition) {
|
|
// Default to selecting whatever is first
|
|
selectedPos = firstPosition;
|
|
for (int i = 0; i < childCount; i++) {
|
|
final View v = getChildAt(i);
|
|
final int top = v.getTop();
|
|
|
|
if (i == 0) {
|
|
// Remember the position of the first item
|
|
selectedTop = top;
|
|
// See if we are scrolled at all
|
|
if (firstPosition > 0 || top < childrenTop) {
|
|
// If we are scrolled, don't select anything that is
|
|
// in the fade region
|
|
// childrenTop += getVerticalFadingEdgeLength();
|
|
}
|
|
}
|
|
if (top >= childrenTop) {
|
|
// Found a view whose top is fully visisble
|
|
selectedPos = firstPosition + i;
|
|
selectedTop = top;
|
|
break;
|
|
}
|
|
}
|
|
} else {
|
|
final int itemCount = mItemCount;
|
|
down = false;
|
|
selectedPos = firstPosition + childCount - 1;
|
|
|
|
for (int i = childCount - 1; i >= 0; i--) {
|
|
final View v = getChildAt(i);
|
|
final int top = v.getTop();
|
|
final int bottom = v.getBottom();
|
|
|
|
if (i == childCount - 1) {
|
|
selectedTop = top;
|
|
if (firstPosition + childCount < itemCount || bottom > childrenBottom) {
|
|
// childrenBottom -= getVerticalFadingEdgeLength();
|
|
}
|
|
}
|
|
|
|
if (bottom <= childrenBottom) {
|
|
selectedPos = firstPosition + i;
|
|
selectedTop = top;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
mResurrectToPosition = INVALID_POSITION;
|
|
removeCallbacks(mFlingRunnable);
|
|
if (mPositionScroller != null) {
|
|
mPositionScroller.stop();
|
|
}
|
|
mTouchMode = TOUCH_MODE_REST;
|
|
clearScrollingCache();
|
|
mSpecificTop = selectedTop;
|
|
selectedPos = lookForSelectablePosition(selectedPos, down);
|
|
if (selectedPos >= firstPosition && selectedPos <= getLastVisiblePosition()) {
|
|
mLayoutMode = LAYOUT_SPECIFIC;
|
|
updateSelectorState();
|
|
setSelectionInt(selectedPos);
|
|
invokeOnItemScrollListener();
|
|
} else {
|
|
selectedPos = INVALID_POSITION;
|
|
}
|
|
reportScrollStateChange(OnScrollListener.SCROLL_STATE_IDLE);
|
|
|
|
return selectedPos >= 0;
|
|
}
|
|
|
|
void confirmCheckedPositionsById() {
|
|
// Clear out the positional check states, we'll rebuild it below from IDs.
|
|
mCheckStates.clear();
|
|
|
|
boolean checkedCountChanged = false;
|
|
for (int checkedIndex = 0; checkedIndex < mCheckedIdStates.size(); checkedIndex++) {
|
|
final long id = mCheckedIdStates.keyAt(checkedIndex);
|
|
final int lastPos = mCheckedIdStates.valueAt(checkedIndex);
|
|
|
|
final long lastPosId = mAdapter.getItemId(lastPos);
|
|
if (id != lastPosId) {
|
|
// Look around to see if the ID is nearby. If not, uncheck it.
|
|
final int start = Math.max(0, lastPos - CHECK_POSITION_SEARCH_DISTANCE);
|
|
final int end = Math.min(lastPos + CHECK_POSITION_SEARCH_DISTANCE, mItemCount);
|
|
boolean found = false;
|
|
for (int searchPos = start; searchPos < end; searchPos++) {
|
|
final long searchId = mAdapter.getItemId(searchPos);
|
|
if (id == searchId) {
|
|
found = true;
|
|
mCheckStates.put(searchPos, true);
|
|
mCheckedIdStates.setValueAt(checkedIndex, searchPos);
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!found) {
|
|
mCheckedIdStates.delete(id);
|
|
checkedIndex--;
|
|
mCheckedItemCount--;
|
|
checkedCountChanged = true;
|
|
if (mChoiceActionMode != null && mMultiChoiceModeCallback != null) {
|
|
mMultiChoiceModeCallback.onItemCheckedStateChanged(mChoiceActionMode,
|
|
lastPos, id, false);
|
|
}
|
|
}
|
|
} else {
|
|
mCheckStates.put(lastPos, true);
|
|
}
|
|
}
|
|
|
|
if (checkedCountChanged && mChoiceActionMode != null) {
|
|
mChoiceActionMode.invalidate();
|
|
}
|
|
}
|
|
|
|
@Override
|
|
protected void handleDataChanged() {
|
|
int count = mItemCount;
|
|
int lastHandledItemCount = mLastHandledItemCount;
|
|
mLastHandledItemCount = mItemCount;
|
|
|
|
if (mChoiceMode != CHOICE_MODE_NONE && mAdapter != null && mAdapter.hasStableIds()) {
|
|
confirmCheckedPositionsById();
|
|
}
|
|
|
|
// TODO: In the future we can recycle these views based on stable ID instead.
|
|
mRecycler.clearTransientStateViews();
|
|
|
|
if (count > 0) {
|
|
int newPos;
|
|
int selectablePos;
|
|
|
|
// Find the row we are supposed to sync to
|
|
if (mNeedSync) {
|
|
// Update this first, since setNextSelectedPositionInt inspects it
|
|
mNeedSync = false;
|
|
|
|
if (mTranscriptMode == TRANSCRIPT_MODE_ALWAYS_SCROLL) {
|
|
mLayoutMode = LAYOUT_FORCE_BOTTOM;
|
|
return;
|
|
} else if (mTranscriptMode == TRANSCRIPT_MODE_NORMAL) {
|
|
if (mForceTranscriptScroll) {
|
|
mForceTranscriptScroll = false;
|
|
mLayoutMode = LAYOUT_FORCE_BOTTOM;
|
|
return;
|
|
}
|
|
final int childCount = getChildCount();
|
|
final int listBottom = getHeight() - getPaddingBottom();
|
|
final View lastChild = getChildAt(childCount - 1);
|
|
final int lastBottom = lastChild != null ? lastChild.getBottom() : listBottom;
|
|
if (mFirstPosition + childCount >= lastHandledItemCount &&
|
|
lastBottom <= listBottom) {
|
|
mLayoutMode = LAYOUT_FORCE_BOTTOM;
|
|
return;
|
|
}
|
|
// Something new came in and we didn't scroll; give the user a clue that
|
|
// there's something new.
|
|
awakenScrollBars();
|
|
}
|
|
|
|
switch (mSyncMode) {
|
|
case SYNC_SELECTED_POSITION:
|
|
if (isInTouchMode()) {
|
|
// We saved our state when not in touch mode. (We know this because
|
|
// mSyncMode is SYNC_SELECTED_POSITION.) Now we are trying to
|
|
// restore in touch mode. Just leave mSyncPosition as it is (possibly
|
|
// adjusting if the available range changed) and return.
|
|
mLayoutMode = LAYOUT_SYNC;
|
|
mSyncPosition = Math.min(Math.max(0, mSyncPosition), count - 1);
|
|
|
|
return;
|
|
} else {
|
|
// See if we can find a position in the new data with the same
|
|
// id as the old selection. This will change mSyncPosition.
|
|
newPos = findSyncPosition();
|
|
if (newPos >= 0) {
|
|
// Found it. Now verify that new selection is still selectable
|
|
selectablePos = lookForSelectablePosition(newPos, true);
|
|
if (selectablePos == newPos) {
|
|
// Same row id is selected
|
|
mSyncPosition = newPos;
|
|
|
|
if (mSyncHeight == getHeight()) {
|
|
// If we are at the same height as when we saved state, try
|
|
// to restore the scroll position too.
|
|
mLayoutMode = LAYOUT_SYNC;
|
|
} else {
|
|
// We are not the same height as when the selection was saved, so
|
|
// don't try to restore the exact position
|
|
mLayoutMode = LAYOUT_SET_SELECTION;
|
|
}
|
|
|
|
// Restore selection
|
|
setNextSelectedPositionInt(newPos);
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
case SYNC_FIRST_POSITION:
|
|
// Leave mSyncPosition as it is -- just pin to available range
|
|
mLayoutMode = LAYOUT_SYNC;
|
|
mSyncPosition = Math.min(Math.max(0, mSyncPosition), count - 1);
|
|
|
|
return;
|
|
}
|
|
}
|
|
|
|
if (!isInTouchMode()) {
|
|
// We couldn't find matching data -- try to use the same position
|
|
newPos = getSelectedItemPosition();
|
|
|
|
// Pin position to the available range
|
|
if (newPos >= count) {
|
|
newPos = count - 1;
|
|
}
|
|
if (newPos < 0) {
|
|
newPos = 0;
|
|
}
|
|
|
|
// Make sure we select something selectable -- first look down
|
|
selectablePos = lookForSelectablePosition(newPos, true);
|
|
|
|
if (selectablePos >= 0) {
|
|
setNextSelectedPositionInt(selectablePos);
|
|
return;
|
|
} else {
|
|
// Looking down didn't work -- try looking up
|
|
selectablePos = lookForSelectablePosition(newPos, false);
|
|
if (selectablePos >= 0) {
|
|
setNextSelectedPositionInt(selectablePos);
|
|
return;
|
|
}
|
|
}
|
|
} else {
|
|
|
|
// We already know where we want to resurrect the selection
|
|
if (mResurrectToPosition >= 0) {
|
|
return;
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
// Nothing is selected. Give up and reset everything.
|
|
mLayoutMode = mStackFromBottom ? LAYOUT_FORCE_BOTTOM : LAYOUT_FORCE_TOP;
|
|
mSelectedPosition = INVALID_POSITION;
|
|
mSelectedRowId = INVALID_ROW_ID;
|
|
mNextSelectedPosition = INVALID_POSITION;
|
|
mNextSelectedRowId = INVALID_ROW_ID;
|
|
mNeedSync = false;
|
|
mSelectorPosition = INVALID_POSITION;
|
|
checkSelectionChanged();
|
|
}
|
|
|
|
/**
|
|
* Removes the filter window
|
|
*/
|
|
private void dismissPopup() {
|
|
if (mPopup != null) {
|
|
mPopup.dismiss();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Shows the filter window
|
|
*/
|
|
private void showPopup() {
|
|
// Make sure we have a window before showing the popup
|
|
if (getWindowVisibility() == View.VISIBLE) {
|
|
createTextFilter(true);
|
|
positionPopup();
|
|
// Make sure we get focus if we are showing the popup
|
|
checkFocus();
|
|
}
|
|
}
|
|
|
|
private void positionPopup() {
|
|
int screenHeight = getResources().getDisplayMetrics().heightPixels;
|
|
final int[] xy = new int[2];
|
|
getLocationOnScreen(xy);
|
|
// TODO: The 20 below should come from the theme
|
|
// TODO: And the gravity should be defined in the theme as well
|
|
final int bottomGap = screenHeight - xy[1] - getHeight() + (int) (mDensityScale * 20);
|
|
if (!mPopup.isShowing()) {
|
|
mPopup.showAtLocation(this, Gravity.BOTTOM | Gravity.CENTER_HORIZONTAL,
|
|
xy[0], bottomGap);
|
|
} else {
|
|
// mPopup.update(xy[0], bottomGap, -1, -1);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* What is the distance between the source and destination rectangles given the direction of
|
|
* focus navigation between them? The direction basically helps figure out more quickly what is
|
|
* self evident by the relationship between the rects...
|
|
*
|
|
* @param source the source rectangle
|
|
* @param dest the destination rectangle
|
|
* @param direction the direction
|
|
* @return the distance between the rectangles
|
|
*/
|
|
static int getDistance(Rect source, Rect dest, int direction) {
|
|
int sX, sY; // source x, y
|
|
int dX, dY; // dest x, y
|
|
switch (direction) {
|
|
case View.FOCUS_RIGHT:
|
|
sX = source.right;
|
|
sY = source.top + source.height() / 2;
|
|
dX = dest.left;
|
|
dY = dest.top + dest.height() / 2;
|
|
break;
|
|
case View.FOCUS_DOWN:
|
|
sX = source.left + source.width() / 2;
|
|
sY = source.bottom;
|
|
dX = dest.left + dest.width() / 2;
|
|
dY = dest.top;
|
|
break;
|
|
case View.FOCUS_LEFT:
|
|
sX = source.left;
|
|
sY = source.top + source.height() / 2;
|
|
dX = dest.right;
|
|
dY = dest.top + dest.height() / 2;
|
|
break;
|
|
case View.FOCUS_UP:
|
|
sX = source.left + source.width() / 2;
|
|
sY = source.top;
|
|
dX = dest.left + dest.width() / 2;
|
|
dY = dest.bottom;
|
|
break;
|
|
case View.FOCUS_FORWARD:
|
|
case View.FOCUS_BACKWARD:
|
|
sX = source.right + source.width() / 2;
|
|
sY = source.top + source.height() / 2;
|
|
dX = dest.left + dest.width() / 2;
|
|
dY = dest.top + dest.height() / 2;
|
|
break;
|
|
default:
|
|
throw new IllegalArgumentException("direction must be one of "
|
|
+ "{FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, FOCUS_RIGHT, "
|
|
+ "FOCUS_FORWARD, FOCUS_BACKWARD}.");
|
|
}
|
|
int deltaX = dX - sX;
|
|
int deltaY = dY - sY;
|
|
return deltaY * deltaY + deltaX * deltaX;
|
|
}
|
|
|
|
@Override
|
|
protected boolean isInFilterMode() {
|
|
return mFiltered;
|
|
}
|
|
|
|
/**
|
|
* Sends a key to the text filter window
|
|
*
|
|
* @param keyCode The keycode for the event
|
|
* @param event The actual key event
|
|
*
|
|
* @return True if the text filter handled the event, false otherwise.
|
|
*/
|
|
boolean sendToTextFilter(int keyCode, int count, KeyEvent event) {
|
|
if (!acceptFilter()) {
|
|
return false;
|
|
}
|
|
|
|
boolean handled = false;
|
|
boolean okToSend = true;
|
|
switch (keyCode) {
|
|
case KeyEvent.KEYCODE_DPAD_UP:
|
|
case KeyEvent.KEYCODE_DPAD_DOWN:
|
|
case KeyEvent.KEYCODE_DPAD_LEFT:
|
|
case KeyEvent.KEYCODE_DPAD_RIGHT:
|
|
case KeyEvent.KEYCODE_DPAD_CENTER:
|
|
case KeyEvent.KEYCODE_ENTER:
|
|
okToSend = false;
|
|
break;
|
|
case KeyEvent.KEYCODE_BACK:
|
|
if (mFiltered && mPopup != null && mPopup.isShowing()) {
|
|
if (event.getAction() == KeyEvent.ACTION_DOWN
|
|
&& event.getRepeatCount() == 0) {
|
|
// KeyEvent.DispatcherState state = getKeyDispatcherState();
|
|
// if (state != null) {
|
|
// state.startTracking(event, this);
|
|
// }
|
|
handled = true;
|
|
} else if (event.getAction() == KeyEvent.ACTION_UP
|
|
&& event.isTracking() && !event.isCanceled()) {
|
|
handled = true;
|
|
mTextFilter.setText("");
|
|
}
|
|
}
|
|
okToSend = false;
|
|
break;
|
|
case KeyEvent.KEYCODE_SPACE:
|
|
// Only send spaces once we are filtered
|
|
okToSend = mFiltered;
|
|
break;
|
|
}
|
|
|
|
if (okToSend) {
|
|
createTextFilter(true);
|
|
|
|
KeyEvent forwardEvent = event;
|
|
if (forwardEvent.getRepeatCount() > 0) {
|
|
forwardEvent = KeyEvent.changeTimeRepeat(event, event.getEventTime(), 0);
|
|
}
|
|
|
|
int action = event.getAction();
|
|
switch (action) {
|
|
case KeyEvent.ACTION_DOWN:
|
|
// handled = mTextFilter.onKeyDown(keyCode, forwardEvent);
|
|
break;
|
|
|
|
case KeyEvent.ACTION_UP:
|
|
// handled = mTextFilter.onKeyUp(keyCode, forwardEvent);
|
|
break;
|
|
|
|
case KeyEvent.ACTION_MULTIPLE:
|
|
// handled = mTextFilter.onKeyMultiple(keyCode, count, event);
|
|
break;
|
|
}
|
|
}
|
|
return handled;
|
|
}
|
|
|
|
/**
|
|
* Creates the window for the text filter and populates it with an EditText field;
|
|
*
|
|
* @param animateEntrance true if the window should appear with an animation
|
|
*/
|
|
private void createTextFilter(boolean animateEntrance) {
|
|
if (mPopup == null) {
|
|
PopupWindow p = new PopupWindow(getContext());
|
|
p.setFocusable(false);
|
|
p.setTouchable(false);
|
|
p.setInputMethodMode(2/*PopupWindow.INPUT_METHOD_NOT_NEEDED*/);
|
|
p.setContentView(getTextFilterInput());
|
|
p.setWidth(LayoutParams.WRAP_CONTENT);
|
|
p.setHeight(LayoutParams.WRAP_CONTENT);
|
|
p.setBackgroundDrawable(null);
|
|
mPopup = p;
|
|
getViewTreeObserver().addOnGlobalLayoutListener(this);
|
|
mGlobalLayoutListenerAddedFilter = true;
|
|
}
|
|
if (animateEntrance) {
|
|
mPopup.setAnimationStyle(com.android.internal.R.style.Animation_TypingFilter);
|
|
} else {
|
|
mPopup.setAnimationStyle(com.android.internal.R.style.Animation_TypingFilterRestore);
|
|
}
|
|
}
|
|
|
|
private EditText getTextFilterInput() {
|
|
// if (mTextFilter == null) {
|
|
// final LayoutInflater layoutInflater = LayoutInflater.from(getContext());
|
|
// mTextFilter = (EditText) layoutInflater.inflate(
|
|
// com.android.internal.R.layout.typing_filter, null);
|
|
// // For some reason setting this as the "real" input type changes
|
|
// // the text view in some way that it doesn't work, and I don't
|
|
// // want to figure out why this is.
|
|
// mTextFilter.setRawInputType(EditorInfo.TYPE_CLASS_TEXT
|
|
// | EditorInfo.TYPE_TEXT_VARIATION_FILTER);
|
|
// mTextFilter.setImeOptions(EditorInfo.IME_FLAG_NO_EXTRACT_UI);
|
|
// mTextFilter.addTextChangedListener(this);
|
|
// }
|
|
return mTextFilter;
|
|
}
|
|
|
|
/**
|
|
* Clear the text filter.
|
|
*/
|
|
public void clearTextFilter() {
|
|
if (mFiltered) {
|
|
getTextFilterInput().setText("");
|
|
mFiltered = false;
|
|
if (mPopup != null && mPopup.isShowing()) {
|
|
dismissPopup();
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Returns if the ListView currently has a text filter.
|
|
*/
|
|
public boolean hasTextFilter() {
|
|
return mFiltered;
|
|
}
|
|
|
|
@Override
|
|
public void onGlobalLayout() {
|
|
if (isShown()) {
|
|
// Show the popup if we are filtered
|
|
if (mFiltered && mPopup != null && !mPopup.isShowing() && !mPopupHidden) {
|
|
showPopup();
|
|
}
|
|
} else {
|
|
// Hide the popup when we are no longer visible
|
|
if (mPopup != null && mPopup.isShowing()) {
|
|
dismissPopup();
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* For our text watcher that is associated with the text filter. Does
|
|
* nothing.
|
|
*/
|
|
@Override
|
|
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
|
|
}
|
|
|
|
/**
|
|
* For our text watcher that is associated with the text filter. Performs
|
|
* the actual filtering as the text changes, and takes care of hiding and
|
|
* showing the popup displaying the currently entered filter text.
|
|
*/
|
|
@Override
|
|
public void onTextChanged(CharSequence s, int start, int before, int count) {
|
|
if (isTextFilterEnabled()) {
|
|
createTextFilter(true);
|
|
int length = s.length();
|
|
boolean showing = mPopup.isShowing();
|
|
if (!showing && length > 0) {
|
|
// Show the filter popup if necessary
|
|
showPopup();
|
|
mFiltered = true;
|
|
} else if (showing && length == 0) {
|
|
// Remove the filter popup if the user has cleared all text
|
|
dismissPopup();
|
|
mFiltered = false;
|
|
}
|
|
if (mAdapter instanceof Filterable) {
|
|
Filter f = ((Filterable) mAdapter).getFilter();
|
|
// Filter should not be null when we reach this part
|
|
if (f != null) {
|
|
f.filter(s, this);
|
|
} else {
|
|
throw new IllegalStateException("You cannot call onTextChanged with a non "
|
|
+ "filterable adapter");
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* For our text watcher that is associated with the text filter. Does
|
|
* nothing.
|
|
*/
|
|
@Override
|
|
public void afterTextChanged(Editable s) {
|
|
}
|
|
|
|
@Override
|
|
public void onFilterComplete(int count) {
|
|
if (mSelectedPosition < 0 && count > 0) {
|
|
mResurrectToPosition = INVALID_POSITION;
|
|
resurrectSelection();
|
|
}
|
|
}
|
|
|
|
@Override
|
|
protected ViewGroup.LayoutParams generateDefaultLayoutParams() {
|
|
return new AbsListView.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,
|
|
ViewGroup.LayoutParams.WRAP_CONTENT, 0);
|
|
}
|
|
|
|
@Override
|
|
protected ViewGroup.LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) {
|
|
return new LayoutParams(p);
|
|
}
|
|
|
|
@Override
|
|
public LayoutParams generateLayoutParams(AttributeSet attrs) {
|
|
return new AbsListView.LayoutParams(getContext(), attrs);
|
|
}
|
|
|
|
@Override
|
|
protected boolean checkLayoutParams(ViewGroup.LayoutParams p) {
|
|
return p instanceof AbsListView.LayoutParams;
|
|
}
|
|
|
|
/**
|
|
* Puts the list or grid into transcript mode. In this mode the list or grid will always scroll
|
|
* to the bottom to show new items.
|
|
*
|
|
* @param mode the transcript mode to set
|
|
*
|
|
* @see #TRANSCRIPT_MODE_DISABLED
|
|
* @see #TRANSCRIPT_MODE_NORMAL
|
|
* @see #TRANSCRIPT_MODE_ALWAYS_SCROLL
|
|
*/
|
|
public void setTranscriptMode(int mode) {
|
|
mTranscriptMode = mode;
|
|
}
|
|
|
|
/**
|
|
* Returns the current transcript mode.
|
|
*
|
|
* @return {@link #TRANSCRIPT_MODE_DISABLED}, {@link #TRANSCRIPT_MODE_NORMAL} or
|
|
* {@link #TRANSCRIPT_MODE_ALWAYS_SCROLL}
|
|
*/
|
|
public int getTranscriptMode() {
|
|
return mTranscriptMode;
|
|
}
|
|
|
|
public int getSolidColor() {
|
|
return mCacheColorHint;
|
|
}
|
|
|
|
/**
|
|
* When set to a non-zero value, the cache color hint indicates that this list is always drawn
|
|
* on top of a solid, single-color, opaque background.
|
|
*
|
|
* Zero means that what's behind this object is translucent (non solid) or is not made of a
|
|
* single color. This hint will not affect any existing background drawable set on this view (
|
|
* typically set via {@link #setBackgroundDrawable(Drawable)}).
|
|
*
|
|
* @param color The background color
|
|
*/
|
|
public void setCacheColorHint(int color) {
|
|
if (color != mCacheColorHint) {
|
|
mCacheColorHint = color;
|
|
int count = getChildCount();
|
|
for (int i = 0; i < count; i++) {
|
|
// getChildAt(i).setDrawingCacheBackgroundColor(color);
|
|
}
|
|
mRecycler.setCacheColorHint(color);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* When set to a non-zero value, the cache color hint indicates that this list is always drawn
|
|
* on top of a solid, single-color, opaque background
|
|
*
|
|
* @return The cache color hint
|
|
*/
|
|
public int getCacheColorHint() {
|
|
return mCacheColorHint;
|
|
}
|
|
|
|
/**
|
|
* Move all views (excluding headers and footers) held by this AbsListView into the supplied
|
|
* List. This includes views displayed on the screen as well as views stored in AbsListView's
|
|
* internal view recycler.
|
|
*
|
|
* @param views A list into which to put the reclaimed views
|
|
*/
|
|
public void reclaimViews(List<View> views) {
|
|
int childCount = getChildCount();
|
|
RecyclerListener listener = mRecycler.mRecyclerListener;
|
|
|
|
// Reclaim views on screen
|
|
for (int i = 0; i < childCount; i++) {
|
|
View child = getChildAt(i);
|
|
AbsListView.LayoutParams lp = (AbsListView.LayoutParams) child.getLayoutParams();
|
|
// Don't reclaim header or footer views, or views that should be ignored
|
|
if (lp != null && mRecycler.shouldRecycleViewType(lp.viewType)) {
|
|
views.add(child);
|
|
child.setAccessibilityDelegate(null);
|
|
if (listener != null) {
|
|
// Pretend they went through the scrap heap
|
|
listener.onMovedToScrapHeap(child);
|
|
}
|
|
}
|
|
}
|
|
mRecycler.reclaimScrapViews(views);
|
|
// removeAllViewsInLayout();
|
|
for (int i = getChildCount() - 1; i >= 0; i--) {
|
|
removeViewInLayout(getChildAt(i));
|
|
}
|
|
}
|
|
|
|
private void finishGlows() {
|
|
if (mEdgeGlowTop != null) {
|
|
// mEdgeGlowTop.finish();
|
|
// mEdgeGlowBottom.finish();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Sets the recycler listener to be notified whenever a View is set aside in
|
|
* the recycler for later reuse. This listener can be used to free resources
|
|
* associated to the View.
|
|
*
|
|
* @param listener The recycler listener to be notified of views set aside
|
|
* in the recycler.
|
|
*
|
|
* @see android.widget.AbsListView.RecycleBin
|
|
* @see android.widget.AbsListView.RecyclerListener
|
|
*/
|
|
public void setRecyclerListener(RecyclerListener listener) {
|
|
mRecycler.mRecyclerListener = listener;
|
|
}
|
|
|
|
class AdapterDataSetObserver extends AdapterView<ListAdapter>.AdapterDataSetObserver {
|
|
@Override
|
|
public void onChanged() {
|
|
super.onChanged();
|
|
// if (mFastScroll != null) {
|
|
// mFastScroll.onSectionsChanged();
|
|
// }
|
|
}
|
|
|
|
@Override
|
|
public void onInvalidated() {
|
|
super.onInvalidated();
|
|
// if (mFastScroll != null) {
|
|
// mFastScroll.onSectionsChanged();
|
|
// }
|
|
}
|
|
}
|
|
|
|
/**
|
|
* A MultiChoiceModeListener receives events for {@link AbsListView#CHOICE_MODE_MULTIPLE_MODAL}.
|
|
* It acts as the {@link ActionMode.Callback} for the selection mode and also receives
|
|
* {@link #onItemCheckedStateChanged(ActionMode, int, long, boolean)} events when the user
|
|
* selects and deselects list items.
|
|
*/
|
|
public interface MultiChoiceModeListener extends ActionMode.Callback {
|
|
/**
|
|
* Called when an item is checked or unchecked during selection mode.
|
|
*
|
|
* @param mode The {@link ActionMode} providing the selection mode
|
|
* @param position Adapter position of the item that was checked or unchecked
|
|
* @param id Adapter ID of the item that was checked or unchecked
|
|
* @param checked <code>true</code> if the item is now checked, <code>false</code>
|
|
* if the item is now unchecked.
|
|
*/
|
|
public void onItemCheckedStateChanged(ActionMode mode,
|
|
int position, long id, boolean checked);
|
|
}
|
|
|
|
class MultiChoiceModeWrapper implements MultiChoiceModeListener {
|
|
private MultiChoiceModeListener mWrapped;
|
|
|
|
public void setWrapped(MultiChoiceModeListener wrapped) {
|
|
mWrapped = wrapped;
|
|
}
|
|
|
|
public boolean hasWrappedCallback() {
|
|
return mWrapped != null;
|
|
}
|
|
|
|
@Override
|
|
public boolean onCreateActionMode(ActionMode mode, Menu menu) {
|
|
if (mWrapped.onCreateActionMode(mode, menu)) {
|
|
// Initialize checked graphic state?
|
|
setLongClickable(false);
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
@Override
|
|
public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
|
|
return mWrapped.onPrepareActionMode(mode, menu);
|
|
}
|
|
|
|
@Override
|
|
public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
|
|
return mWrapped.onActionItemClicked(mode, item);
|
|
}
|
|
|
|
@Override
|
|
public void onDestroyActionMode(ActionMode mode) {
|
|
mWrapped.onDestroyActionMode(mode);
|
|
mChoiceActionMode = null;
|
|
|
|
// Ending selection mode means deselecting everything.
|
|
clearChoices();
|
|
|
|
mDataChanged = true;
|
|
rememberSyncState();
|
|
requestLayout();
|
|
|
|
setLongClickable(true);
|
|
}
|
|
|
|
@Override
|
|
public void onItemCheckedStateChanged(ActionMode mode,
|
|
int position, long id, boolean checked) {
|
|
mWrapped.onItemCheckedStateChanged(mode, position, id, checked);
|
|
|
|
// If there are no items selected we no longer need the selection mode.
|
|
if (getCheckedItemCount() == 0) {
|
|
mode.finish();
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* AbsListView extends LayoutParams to provide a place to hold the view type.
|
|
*/
|
|
public static class LayoutParams extends ViewGroup.LayoutParams {
|
|
/**
|
|
* View type for this view, as returned by
|
|
* {@link android.widget.Adapter#getItemViewType(int) }
|
|
*/
|
|
int viewType;
|
|
|
|
/**
|
|
* When this boolean is set, the view has been added to the AbsListView
|
|
* at least once. It is used to know whether headers/footers have already
|
|
* been added to the list view and whether they should be treated as
|
|
* recycled views or not.
|
|
*/
|
|
boolean recycledHeaderFooter;
|
|
|
|
/**
|
|
* When an AbsListView is measured with an AT_MOST measure spec, it needs
|
|
* to obtain children views to measure itself. When doing so, the children
|
|
* are not attached to the window, but put in the recycler which assumes
|
|
* they've been attached before. Setting this flag will force the reused
|
|
* view to be attached to the window rather than just attached to the
|
|
* parent.
|
|
*/
|
|
boolean forceAdd;
|
|
|
|
/**
|
|
* The position the view was removed from when pulled out of the
|
|
* scrap heap.
|
|
* @hide
|
|
*/
|
|
int scrappedFromPosition;
|
|
|
|
/**
|
|
* The ID the view represents
|
|
*/
|
|
long itemId = -1;
|
|
|
|
/** Whether the adapter considers the item enabled. */
|
|
boolean isEnabled;
|
|
|
|
public LayoutParams(Context c, AttributeSet attrs) {
|
|
super(c, attrs);
|
|
}
|
|
|
|
public LayoutParams(int w, int h) {
|
|
super(w, h);
|
|
}
|
|
|
|
public LayoutParams(int w, int h, int viewType) {
|
|
super(w, h);
|
|
this.viewType = viewType;
|
|
}
|
|
|
|
public LayoutParams(ViewGroup.LayoutParams source) {
|
|
super(source.width, source.height, source.weight);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* A RecyclerListener is used to receive a notification whenever a View is placed
|
|
* inside the RecycleBin's scrap heap. This listener is used to free resources
|
|
* associated to Views placed in the RecycleBin.
|
|
*
|
|
* @see android.widget.AbsListView.RecycleBin
|
|
* @see android.widget.AbsListView#setRecyclerListener(android.widget.AbsListView.RecyclerListener)
|
|
*/
|
|
public static interface RecyclerListener {
|
|
/**
|
|
* Indicates that the specified View was moved into the recycler's scrap heap.
|
|
* The view is not displayed on screen any more and any expensive resource
|
|
* associated with the view should be discarded.
|
|
*
|
|
* @param view
|
|
*/
|
|
void onMovedToScrapHeap(View view);
|
|
}
|
|
|
|
/**
|
|
* The RecycleBin facilitates reuse of views across layouts. The RecycleBin has two levels of
|
|
* storage: ActiveViews and ScrapViews. ActiveViews are those views which were onscreen at the
|
|
* start of a layout. By construction, they are displaying current information. At the end of
|
|
* layout, all views in ActiveViews are demoted to ScrapViews. ScrapViews are old views that
|
|
* could potentially be used by the adapter to avoid allocating views unnecessarily.
|
|
*
|
|
* @see android.widget.AbsListView#setRecyclerListener(android.widget.AbsListView.RecyclerListener)
|
|
* @see android.widget.AbsListView.RecyclerListener
|
|
*/
|
|
class RecycleBin {
|
|
private RecyclerListener mRecyclerListener;
|
|
|
|
/**
|
|
* The position of the first view stored in mActiveViews.
|
|
*/
|
|
private int mFirstActivePosition;
|
|
|
|
/**
|
|
* Views that were on screen at the start of layout. This array is populated at the start of
|
|
* layout, and at the end of layout all view in mActiveViews are moved to mScrapViews.
|
|
* Views in mActiveViews represent a contiguous range of Views, with position of the first
|
|
* view store in mFirstActivePosition.
|
|
*/
|
|
private View[] mActiveViews = new View[0];
|
|
|
|
/**
|
|
* Unsorted views that can be used by the adapter as a convert view.
|
|
*/
|
|
private ArrayList<View>[] mScrapViews;
|
|
|
|
private int mViewTypeCount;
|
|
|
|
private ArrayList<View> mCurrentScrap;
|
|
|
|
private ArrayList<View> mSkippedScrap;
|
|
|
|
private SparseArray<View> mTransientStateViews;
|
|
private LongSparseArray<View> mTransientStateViewsById;
|
|
|
|
public void setViewTypeCount(int viewTypeCount) {
|
|
if (viewTypeCount < 1) {
|
|
throw new IllegalArgumentException("Can't have a viewTypeCount < 1");
|
|
}
|
|
//noinspection unchecked
|
|
@SuppressWarnings("unchecked")
|
|
ArrayList<View>[] scrapViews = new ArrayList[viewTypeCount];
|
|
for (int i = 0; i < viewTypeCount; i++) {
|
|
scrapViews[i] = new ArrayList<View>();
|
|
}
|
|
mViewTypeCount = viewTypeCount;
|
|
mCurrentScrap = scrapViews[0];
|
|
mScrapViews = scrapViews;
|
|
}
|
|
|
|
public void markChildrenDirty() {
|
|
if (mViewTypeCount == 1) {
|
|
final ArrayList<View> scrap = mCurrentScrap;
|
|
final int scrapCount = scrap.size();
|
|
for (int i = 0; i < scrapCount; i++) {
|
|
scrap.get(i).forceLayout();
|
|
}
|
|
} else {
|
|
final int typeCount = mViewTypeCount;
|
|
for (int i = 0; i < typeCount; i++) {
|
|
final ArrayList<View> scrap = mScrapViews[i];
|
|
final int scrapCount = scrap.size();
|
|
for (int j = 0; j < scrapCount; j++) {
|
|
scrap.get(j).forceLayout();
|
|
}
|
|
}
|
|
}
|
|
if (mTransientStateViews != null) {
|
|
final int count = mTransientStateViews.size();
|
|
for (int i = 0; i < count; i++) {
|
|
mTransientStateViews.valueAt(i).forceLayout();
|
|
}
|
|
}
|
|
if (mTransientStateViewsById != null) {
|
|
final int count = mTransientStateViewsById.size();
|
|
for (int i = 0; i < count; i++) {
|
|
mTransientStateViewsById.valueAt(i).forceLayout();
|
|
}
|
|
}
|
|
}
|
|
|
|
public boolean shouldRecycleViewType(int viewType) {
|
|
return viewType >= 0;
|
|
}
|
|
|
|
/**
|
|
* Clears the scrap heap.
|
|
*/
|
|
void clear() {
|
|
if (mViewTypeCount == 1) {
|
|
final ArrayList<View> scrap = mCurrentScrap;
|
|
clearScrap(scrap);
|
|
} else {
|
|
final int typeCount = mViewTypeCount;
|
|
for (int i = 0; i < typeCount; i++) {
|
|
final ArrayList<View> scrap = mScrapViews[i];
|
|
clearScrap(scrap);
|
|
}
|
|
}
|
|
|
|
clearTransientStateViews();
|
|
}
|
|
|
|
/**
|
|
* Fill ActiveViews with all of the children of the AbsListView.
|
|
*
|
|
* @param childCount The minimum number of views mActiveViews should hold
|
|
* @param firstActivePosition The position of the first view that will be stored in
|
|
* mActiveViews
|
|
*/
|
|
void fillActiveViews(int childCount, int firstActivePosition) {
|
|
if (mActiveViews.length < childCount) {
|
|
mActiveViews = new View[childCount];
|
|
}
|
|
mFirstActivePosition = firstActivePosition;
|
|
|
|
//noinspection MismatchedReadAndWriteOfArray
|
|
final View[] activeViews = mActiveViews;
|
|
for (int i = 0; i < childCount; i++) {
|
|
View child = getChildAt(i);
|
|
AbsListView.LayoutParams lp = (AbsListView.LayoutParams) child.getLayoutParams();
|
|
// Don't put header or footer views into the scrap heap
|
|
if (lp != null && lp.viewType != ITEM_VIEW_TYPE_HEADER_OR_FOOTER) {
|
|
// Note: We do place AdapterView.ITEM_VIEW_TYPE_IGNORE in active views.
|
|
// However, we will NOT place them into scrap views.
|
|
activeViews[i] = child;
|
|
// Remember the position so that setupChild() doesn't reset state.
|
|
lp.scrappedFromPosition = firstActivePosition + i;
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Get the view corresponding to the specified position. The view will be removed from
|
|
* mActiveViews if it is found.
|
|
*
|
|
* @param position The position to look up in mActiveViews
|
|
* @return The view if it is found, null otherwise
|
|
*/
|
|
View getActiveView(int position) {
|
|
int index = position - mFirstActivePosition;
|
|
final View[] activeViews = mActiveViews;
|
|
if (index >=0 && index < activeViews.length) {
|
|
final View match = activeViews[index];
|
|
activeViews[index] = null;
|
|
return match;
|
|
}
|
|
return null;
|
|
}
|
|
|
|
View getTransientStateView(int position) {
|
|
if (mAdapter != null && mAdapterHasStableIds && mTransientStateViewsById != null) {
|
|
long id = mAdapter.getItemId(position);
|
|
View result = mTransientStateViewsById.get(id);
|
|
mTransientStateViewsById.remove(id);
|
|
return result;
|
|
}
|
|
if (mTransientStateViews != null) {
|
|
final int index = mTransientStateViews.indexOfKey(position);
|
|
if (index >= 0) {
|
|
View result = mTransientStateViews.valueAt(index);
|
|
mTransientStateViews.removeAt(index);
|
|
return result;
|
|
}
|
|
}
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* Dumps and fully detaches any currently saved views with transient
|
|
* state.
|
|
*/
|
|
void clearTransientStateViews() {
|
|
final SparseArray<View> viewsByPos = mTransientStateViews;
|
|
if (viewsByPos != null) {
|
|
final int N = viewsByPos.size();
|
|
for (int i = 0; i < N; i++) {
|
|
removeDetachedView(viewsByPos.valueAt(i), false);
|
|
}
|
|
viewsByPos.clear();
|
|
}
|
|
|
|
final LongSparseArray<View> viewsById = mTransientStateViewsById;
|
|
if (viewsById != null) {
|
|
final int N = viewsById.size();
|
|
for (int i = 0; i < N; i++) {
|
|
removeDetachedView(viewsById.valueAt(i), false);
|
|
}
|
|
viewsById.clear();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @return A view from the ScrapViews collection. These are unordered.
|
|
*/
|
|
View getScrapView(int position) {
|
|
final int whichScrap = mAdapter.getItemViewType(position);
|
|
if (whichScrap < 0) {
|
|
return null;
|
|
}
|
|
if (mViewTypeCount == 1) {
|
|
return retrieveFromScrap(mCurrentScrap, position);
|
|
} else if (whichScrap < mScrapViews.length) {
|
|
return retrieveFromScrap(mScrapViews[whichScrap], position);
|
|
}
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* Puts a view into the list of scrap views.
|
|
* <p>
|
|
* If the list data hasn't changed or the adapter has stable IDs, views
|
|
* with transient state will be preserved for later retrieval.
|
|
*
|
|
* @param scrap The view to add
|
|
* @param position The view's position within its parent
|
|
*/
|
|
void addScrapView(View scrap, int position) {
|
|
final AbsListView.LayoutParams lp = (AbsListView.LayoutParams) scrap.getLayoutParams();
|
|
if (lp == null) {
|
|
// Can't recycle, but we don't know anything about the view.
|
|
// Ignore it completely.
|
|
return;
|
|
}
|
|
|
|
lp.scrappedFromPosition = position;
|
|
|
|
// Remove but don't scrap header or footer views, or views that
|
|
// should otherwise not be recycled.
|
|
final int viewType = lp.viewType;
|
|
if (!shouldRecycleViewType(viewType)) {
|
|
// Can't recycle. If it's not a header or footer, which have
|
|
// special handling and should be ignored, then skip the scrap
|
|
// heap and we'll fully detach the view later.
|
|
if (viewType != ITEM_VIEW_TYPE_HEADER_OR_FOOTER) {
|
|
getSkippedScrap().add(scrap);
|
|
}
|
|
return;
|
|
}
|
|
|
|
// scrap.dispatchStartTemporaryDetach();
|
|
|
|
// Don't scrap views that have transient state.
|
|
final boolean scrapHasTransientState = scrap.hasTransientState();
|
|
if (scrapHasTransientState) {
|
|
if (mAdapter != null && mAdapterHasStableIds) {
|
|
// If the adapter has stable IDs, we can reuse the view for
|
|
// the same data.
|
|
if (mTransientStateViewsById == null) {
|
|
mTransientStateViewsById = new LongSparseArray<>();
|
|
}
|
|
mTransientStateViewsById.put(lp.itemId, scrap);
|
|
} else if (!mDataChanged) {
|
|
// If the data hasn't changed, we can reuse the views at
|
|
// their old positions.
|
|
if (mTransientStateViews == null) {
|
|
mTransientStateViews = new SparseArray<>();
|
|
}
|
|
mTransientStateViews.put(position, scrap);
|
|
} else {
|
|
// Otherwise, we'll have to remove the view and start over.
|
|
getSkippedScrap().add(scrap);
|
|
}
|
|
} else {
|
|
if (mViewTypeCount == 1) {
|
|
mCurrentScrap.add(scrap);
|
|
} else {
|
|
mScrapViews[viewType].add(scrap);
|
|
}
|
|
|
|
if (mRecyclerListener != null) {
|
|
mRecyclerListener.onMovedToScrapHeap(scrap);
|
|
}
|
|
}
|
|
}
|
|
|
|
private ArrayList<View> getSkippedScrap() {
|
|
if (mSkippedScrap == null) {
|
|
mSkippedScrap = new ArrayList<>();
|
|
}
|
|
return mSkippedScrap;
|
|
}
|
|
|
|
/**
|
|
* Finish the removal of any views that skipped the scrap heap.
|
|
*/
|
|
void removeSkippedScrap() {
|
|
if (mSkippedScrap == null) {
|
|
return;
|
|
}
|
|
final int count = mSkippedScrap.size();
|
|
for (int i = 0; i < count; i++) {
|
|
removeDetachedView(mSkippedScrap.get(i), false);
|
|
}
|
|
mSkippedScrap.clear();
|
|
}
|
|
|
|
/**
|
|
* Move all views remaining in mActiveViews to mScrapViews.
|
|
*/
|
|
void scrapActiveViews() {
|
|
final View[] activeViews = mActiveViews;
|
|
final boolean hasListener = mRecyclerListener != null;
|
|
final boolean multipleScraps = mViewTypeCount > 1;
|
|
|
|
ArrayList<View> scrapViews = mCurrentScrap;
|
|
final int count = activeViews.length;
|
|
for (int i = count - 1; i >= 0; i--) {
|
|
final View victim = activeViews[i];
|
|
if (victim != null) {
|
|
final AbsListView.LayoutParams lp
|
|
= (AbsListView.LayoutParams) victim.getLayoutParams();
|
|
final int whichScrap = lp.viewType;
|
|
|
|
activeViews[i] = null;
|
|
|
|
if (victim.hasTransientState()) {
|
|
// Store views with transient state for later use.
|
|
// victim.dispatchStartTemporaryDetach();
|
|
|
|
if (mAdapter != null && mAdapterHasStableIds) {
|
|
if (mTransientStateViewsById == null) {
|
|
mTransientStateViewsById = new LongSparseArray<View>();
|
|
}
|
|
long id = mAdapter.getItemId(mFirstActivePosition + i);
|
|
mTransientStateViewsById.put(id, victim);
|
|
} else if (!mDataChanged) {
|
|
if (mTransientStateViews == null) {
|
|
mTransientStateViews = new SparseArray<View>();
|
|
}
|
|
mTransientStateViews.put(mFirstActivePosition + i, victim);
|
|
} else if (whichScrap != ITEM_VIEW_TYPE_HEADER_OR_FOOTER) {
|
|
// The data has changed, we can't keep this view.
|
|
removeDetachedView(victim, false);
|
|
}
|
|
} else if (!shouldRecycleViewType(whichScrap)) {
|
|
// Discard non-recyclable views except headers/footers.
|
|
if (whichScrap != ITEM_VIEW_TYPE_HEADER_OR_FOOTER) {
|
|
removeDetachedView(victim, false);
|
|
}
|
|
} else {
|
|
// Store everything else on the appropriate scrap heap.
|
|
if (multipleScraps) {
|
|
scrapViews = mScrapViews[whichScrap];
|
|
}
|
|
|
|
// victim.dispatchStartTemporaryDetach();
|
|
lp.scrappedFromPosition = mFirstActivePosition + i;
|
|
scrapViews.add(victim);
|
|
|
|
if (hasListener) {
|
|
mRecyclerListener.onMovedToScrapHeap(victim);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
pruneScrapViews();
|
|
}
|
|
|
|
/**
|
|
* Makes sure that the size of mScrapViews does not exceed the size of
|
|
* mActiveViews, which can happen if an adapter does not recycle its
|
|
* views. Removes cached transient state views that no longer have
|
|
* transient state.
|
|
*/
|
|
private void pruneScrapViews() {
|
|
final int maxViews = mActiveViews.length;
|
|
final int viewTypeCount = mViewTypeCount;
|
|
final ArrayList<View>[] scrapViews = mScrapViews;
|
|
for (int i = 0; i < viewTypeCount; ++i) {
|
|
final ArrayList<View> scrapPile = scrapViews[i];
|
|
int size = scrapPile.size();
|
|
final int extras = size - maxViews;
|
|
size--;
|
|
for (int j = 0; j < extras; j++) {
|
|
removeDetachedView(scrapPile.remove(size--), false);
|
|
}
|
|
}
|
|
|
|
final SparseArray<View> transViewsByPos = mTransientStateViews;
|
|
if (transViewsByPos != null) {
|
|
for (int i = 0; i < transViewsByPos.size(); i++) {
|
|
final View v = transViewsByPos.valueAt(i);
|
|
if (!v.hasTransientState()) {
|
|
removeDetachedView(v, false);
|
|
transViewsByPos.removeAt(i);
|
|
i--;
|
|
}
|
|
}
|
|
}
|
|
|
|
final LongSparseArray<View> transViewsById = mTransientStateViewsById;
|
|
if (transViewsById != null) {
|
|
for (int i = 0; i < transViewsById.size(); i++) {
|
|
final View v = transViewsById.valueAt(i);
|
|
if (!v.hasTransientState()) {
|
|
removeDetachedView(v, false);
|
|
transViewsById.removeAt(i);
|
|
i--;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Puts all views in the scrap heap into the supplied list.
|
|
*/
|
|
void reclaimScrapViews(List<View> views) {
|
|
if (mViewTypeCount == 1) {
|
|
views.addAll(mCurrentScrap);
|
|
} else {
|
|
final int viewTypeCount = mViewTypeCount;
|
|
final ArrayList<View>[] scrapViews = mScrapViews;
|
|
for (int i = 0; i < viewTypeCount; ++i) {
|
|
final ArrayList<View> scrapPile = scrapViews[i];
|
|
views.addAll(scrapPile);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Updates the cache color hint of all known views.
|
|
*
|
|
* @param color The new cache color hint.
|
|
*/
|
|
void setCacheColorHint(int color) {
|
|
if (mViewTypeCount == 1) {
|
|
final ArrayList<View> scrap = mCurrentScrap;
|
|
final int scrapCount = scrap.size();
|
|
for (int i = 0; i < scrapCount; i++) {
|
|
// scrap.get(i).setDrawingCacheBackgroundColor(color);
|
|
}
|
|
} else {
|
|
final int typeCount = mViewTypeCount;
|
|
for (int i = 0; i < typeCount; i++) {
|
|
final ArrayList<View> scrap = mScrapViews[i];
|
|
final int scrapCount = scrap.size();
|
|
for (int j = 0; j < scrapCount; j++) {
|
|
// scrap.get(j).setDrawingCacheBackgroundColor(color);
|
|
}
|
|
}
|
|
}
|
|
// Just in case this is called during a layout pass
|
|
final View[] activeViews = mActiveViews;
|
|
final int count = activeViews.length;
|
|
for (int i = 0; i < count; ++i) {
|
|
final View victim = activeViews[i];
|
|
if (victim != null) {
|
|
// victim.setDrawingCacheBackgroundColor(color);
|
|
}
|
|
}
|
|
}
|
|
|
|
private View retrieveFromScrap(ArrayList<View> scrapViews, int position) {
|
|
final int size = scrapViews.size();
|
|
if (size > 0) {
|
|
// See if we still have a view for this position or ID.
|
|
for (int i = 0; i < size; i++) {
|
|
final View view = scrapViews.get(i);
|
|
final AbsListView.LayoutParams params =
|
|
(AbsListView.LayoutParams) view.getLayoutParams();
|
|
|
|
if (mAdapterHasStableIds) {
|
|
final long id = mAdapter.getItemId(position);
|
|
if (id == params.itemId) {
|
|
return scrapViews.remove(i);
|
|
}
|
|
} else if (params.scrappedFromPosition == position) {
|
|
final View scrap = scrapViews.remove(i);
|
|
return scrap;
|
|
}
|
|
}
|
|
final View scrap = scrapViews.remove(size - 1);
|
|
return scrap;
|
|
} else {
|
|
return null;
|
|
}
|
|
}
|
|
|
|
private void clearScrap(final ArrayList<View> scrap) {
|
|
final int scrapCount = scrap.size();
|
|
for (int j = 0; j < scrapCount; j++) {
|
|
removeDetachedView(scrap.remove(scrapCount - 1 - j), false);
|
|
}
|
|
}
|
|
|
|
private void removeDetachedView(View child, boolean animate) {
|
|
AbsListView.this.removeDetachedView(child, animate);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Returns the height of the view for the specified position.
|
|
*
|
|
* @param position the item position
|
|
* @return view height in pixels
|
|
*/
|
|
int getHeightForPosition(int position) {
|
|
final int firstVisiblePosition = getFirstVisiblePosition();
|
|
final int childCount = getChildCount();
|
|
final int index = position - firstVisiblePosition;
|
|
if (index >= 0 && index < childCount) {
|
|
// Position is on-screen, use existing view.
|
|
final View view = getChildAt(index);
|
|
return view.getHeight();
|
|
} else {
|
|
// Position is off-screen, obtain & recycle view.
|
|
final View view = obtainView(position, mIsScrap);
|
|
view.measure(mWidthMeasureSpec, MeasureSpec.UNSPECIFIED);
|
|
final int height = view.getMeasuredHeight();
|
|
mRecycler.addScrapView(view, position);
|
|
return height;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Sets the selected item and positions the selection y pixels from the top edge
|
|
* of the ListView. (If in touch mode, the item will not be selected but it will
|
|
* still be positioned appropriately.)
|
|
*
|
|
* @param position Index (starting at 0) of the data item to be selected.
|
|
* @param y The distance from the top edge of the ListView (plus padding) that the
|
|
* item will be positioned.
|
|
*/
|
|
public void setSelectionFromTop(int position, int y) {
|
|
if (mAdapter == null) {
|
|
return;
|
|
}
|
|
|
|
if (!isInTouchMode()) {
|
|
position = lookForSelectablePosition(position, true);
|
|
if (position >= 0) {
|
|
setNextSelectedPositionInt(position);
|
|
}
|
|
} else {
|
|
mResurrectToPosition = position;
|
|
}
|
|
|
|
if (position >= 0) {
|
|
mLayoutMode = LAYOUT_SPECIFIC;
|
|
mSpecificTop = mListPadding.top + y;
|
|
|
|
if (mNeedSync) {
|
|
mSyncPosition = position;
|
|
mSyncRowId = mAdapter.getItemId(position);
|
|
}
|
|
|
|
if (mPositionScroller != null) {
|
|
mPositionScroller.stop();
|
|
}
|
|
requestLayout();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Abstract positon scroller used to handle smooth scrolling.
|
|
*/
|
|
static abstract class AbsPositionScroller {
|
|
public abstract void start(int position);
|
|
public abstract void start(int position, int boundPosition);
|
|
public abstract void startWithOffset(int position, int offset);
|
|
public abstract void startWithOffset(int position, int offset, int duration);
|
|
public abstract void stop();
|
|
}
|
|
|
|
/**
|
|
* Default position scroller that simulates a fling.
|
|
*/
|
|
class PositionScroller extends AbsPositionScroller implements Runnable {
|
|
private static final int SCROLL_DURATION = 200;
|
|
|
|
private static final int MOVE_DOWN_POS = 1;
|
|
private static final int MOVE_UP_POS = 2;
|
|
private static final int MOVE_DOWN_BOUND = 3;
|
|
private static final int MOVE_UP_BOUND = 4;
|
|
private static final int MOVE_OFFSET = 5;
|
|
|
|
private int mMode;
|
|
private int mTargetPos;
|
|
private int mBoundPos;
|
|
private int mLastSeenPos;
|
|
private int mScrollDuration;
|
|
private final int mExtraScroll;
|
|
|
|
private int mOffsetFromTop;
|
|
|
|
PositionScroller() {
|
|
mExtraScroll = 0; // ViewConfiguration.get(mContext).getScaledFadingEdgeLength();
|
|
}
|
|
|
|
@Override
|
|
public void start(final int position) {
|
|
stop();
|
|
|
|
if (mDataChanged) {
|
|
// Wait until we're back in a stable state to try this.
|
|
mPositionScrollAfterLayout = new Runnable() {
|
|
@Override public void run() {
|
|
start(position);
|
|
}
|
|
};
|
|
return;
|
|
}
|
|
|
|
final int childCount = getChildCount();
|
|
if (childCount == 0) {
|
|
// Can't scroll without children.
|
|
return;
|
|
}
|
|
|
|
final int firstPos = mFirstPosition;
|
|
final int lastPos = firstPos + childCount - 1;
|
|
|
|
int viewTravelCount;
|
|
int clampedPosition = Math.max(0, Math.min(getCount() - 1, position));
|
|
if (clampedPosition < firstPos) {
|
|
viewTravelCount = firstPos - clampedPosition + 1;
|
|
mMode = MOVE_UP_POS;
|
|
} else if (clampedPosition > lastPos) {
|
|
viewTravelCount = clampedPosition - lastPos + 1;
|
|
mMode = MOVE_DOWN_POS;
|
|
} else {
|
|
scrollToVisible(clampedPosition, INVALID_POSITION, SCROLL_DURATION);
|
|
return;
|
|
}
|
|
|
|
if (viewTravelCount > 0) {
|
|
mScrollDuration = SCROLL_DURATION / viewTravelCount;
|
|
} else {
|
|
mScrollDuration = SCROLL_DURATION;
|
|
}
|
|
mTargetPos = clampedPosition;
|
|
mBoundPos = INVALID_POSITION;
|
|
mLastSeenPos = INVALID_POSITION;
|
|
|
|
postOnAnimation(this);
|
|
}
|
|
|
|
@Override
|
|
public void start(final int position, final int boundPosition) {
|
|
stop();
|
|
|
|
if (boundPosition == INVALID_POSITION) {
|
|
start(position);
|
|
return;
|
|
}
|
|
|
|
if (mDataChanged) {
|
|
// Wait until we're back in a stable state to try this.
|
|
mPositionScrollAfterLayout = new Runnable() {
|
|
@Override public void run() {
|
|
start(position, boundPosition);
|
|
}
|
|
};
|
|
return;
|
|
}
|
|
|
|
final int childCount = getChildCount();
|
|
if (childCount == 0) {
|
|
// Can't scroll without children.
|
|
return;
|
|
}
|
|
|
|
final int firstPos = mFirstPosition;
|
|
final int lastPos = firstPos + childCount - 1;
|
|
|
|
int viewTravelCount;
|
|
int clampedPosition = Math.max(0, Math.min(getCount() - 1, position));
|
|
if (clampedPosition < firstPos) {
|
|
final int boundPosFromLast = lastPos - boundPosition;
|
|
if (boundPosFromLast < 1) {
|
|
// Moving would shift our bound position off the screen. Abort.
|
|
return;
|
|
}
|
|
|
|
final int posTravel = firstPos - clampedPosition + 1;
|
|
final int boundTravel = boundPosFromLast - 1;
|
|
if (boundTravel < posTravel) {
|
|
viewTravelCount = boundTravel;
|
|
mMode = MOVE_UP_BOUND;
|
|
} else {
|
|
viewTravelCount = posTravel;
|
|
mMode = MOVE_UP_POS;
|
|
}
|
|
} else if (clampedPosition > lastPos) {
|
|
final int boundPosFromFirst = boundPosition - firstPos;
|
|
if (boundPosFromFirst < 1) {
|
|
// Moving would shift our bound position off the screen. Abort.
|
|
return;
|
|
}
|
|
|
|
final int posTravel = clampedPosition - lastPos + 1;
|
|
final int boundTravel = boundPosFromFirst - 1;
|
|
if (boundTravel < posTravel) {
|
|
viewTravelCount = boundTravel;
|
|
mMode = MOVE_DOWN_BOUND;
|
|
} else {
|
|
viewTravelCount = posTravel;
|
|
mMode = MOVE_DOWN_POS;
|
|
}
|
|
} else {
|
|
scrollToVisible(clampedPosition, boundPosition, SCROLL_DURATION);
|
|
return;
|
|
}
|
|
|
|
if (viewTravelCount > 0) {
|
|
mScrollDuration = SCROLL_DURATION / viewTravelCount;
|
|
} else {
|
|
mScrollDuration = SCROLL_DURATION;
|
|
}
|
|
mTargetPos = clampedPosition;
|
|
mBoundPos = boundPosition;
|
|
mLastSeenPos = INVALID_POSITION;
|
|
|
|
postOnAnimation(this);
|
|
}
|
|
|
|
@Override
|
|
public void startWithOffset(int position, int offset) {
|
|
startWithOffset(position, offset, SCROLL_DURATION);
|
|
}
|
|
|
|
@Override
|
|
public void startWithOffset(final int position, int offset, final int duration) {
|
|
stop();
|
|
|
|
if (mDataChanged) {
|
|
// Wait until we're back in a stable state to try this.
|
|
final int postOffset = offset;
|
|
mPositionScrollAfterLayout = new Runnable() {
|
|
@Override public void run() {
|
|
startWithOffset(position, postOffset, duration);
|
|
}
|
|
};
|
|
return;
|
|
}
|
|
|
|
final int childCount = getChildCount();
|
|
if (childCount == 0) {
|
|
// Can't scroll without children.
|
|
return;
|
|
}
|
|
|
|
offset += getPaddingTop();
|
|
|
|
mTargetPos = Math.max(0, Math.min(getCount() - 1, position));
|
|
mOffsetFromTop = offset;
|
|
mBoundPos = INVALID_POSITION;
|
|
mLastSeenPos = INVALID_POSITION;
|
|
mMode = MOVE_OFFSET;
|
|
|
|
final int firstPos = mFirstPosition;
|
|
final int lastPos = firstPos + childCount - 1;
|
|
|
|
int viewTravelCount;
|
|
if (mTargetPos < firstPos) {
|
|
viewTravelCount = firstPos - mTargetPos;
|
|
} else if (mTargetPos > lastPos) {
|
|
viewTravelCount = mTargetPos - lastPos;
|
|
} else {
|
|
// On-screen, just scroll.
|
|
final int targetTop = getChildAt(mTargetPos - firstPos).getTop();
|
|
smoothScrollBy(targetTop - offset, duration, true);
|
|
return;
|
|
}
|
|
|
|
// Estimate how many screens we should travel
|
|
final float screenTravelCount = (float) viewTravelCount / childCount;
|
|
mScrollDuration = screenTravelCount < 1 ?
|
|
duration : (int) (duration / screenTravelCount);
|
|
mLastSeenPos = INVALID_POSITION;
|
|
|
|
postOnAnimation(this);
|
|
}
|
|
|
|
/**
|
|
* Scroll such that targetPos is in the visible padded region without scrolling
|
|
* boundPos out of view. Assumes targetPos is onscreen.
|
|
*/
|
|
private void scrollToVisible(int targetPos, int boundPos, int duration) {
|
|
final int firstPos = mFirstPosition;
|
|
final int childCount = getChildCount();
|
|
final int lastPos = firstPos + childCount - 1;
|
|
final int paddedTop = mListPadding.top;
|
|
final int paddedBottom = getHeight() - mListPadding.bottom;
|
|
|
|
if (targetPos < firstPos || targetPos > lastPos) {
|
|
Log.w(TAG, "scrollToVisible called with targetPos " + targetPos +
|
|
" not visible [" + firstPos + ", " + lastPos + "]");
|
|
}
|
|
if (boundPos < firstPos || boundPos > lastPos) {
|
|
// boundPos doesn't matter, it's already offscreen.
|
|
boundPos = INVALID_POSITION;
|
|
}
|
|
|
|
final View targetChild = getChildAt(targetPos - firstPos);
|
|
final int targetTop = targetChild.getTop();
|
|
final int targetBottom = targetChild.getBottom();
|
|
int scrollBy = 0;
|
|
|
|
if (targetBottom > paddedBottom) {
|
|
scrollBy = targetBottom - paddedBottom;
|
|
}
|
|
if (targetTop < paddedTop) {
|
|
scrollBy = targetTop - paddedTop;
|
|
}
|
|
|
|
if (scrollBy == 0) {
|
|
return;
|
|
}
|
|
|
|
if (boundPos >= 0) {
|
|
final View boundChild = getChildAt(boundPos - firstPos);
|
|
final int boundTop = boundChild.getTop();
|
|
final int boundBottom = boundChild.getBottom();
|
|
final int absScroll = Math.abs(scrollBy);
|
|
|
|
if (scrollBy < 0 && boundBottom + absScroll > paddedBottom) {
|
|
// Don't scroll the bound view off the bottom of the screen.
|
|
scrollBy = Math.max(0, boundBottom - paddedBottom);
|
|
} else if (scrollBy > 0 && boundTop - absScroll < paddedTop) {
|
|
// Don't scroll the bound view off the top of the screen.
|
|
scrollBy = Math.min(0, boundTop - paddedTop);
|
|
}
|
|
}
|
|
|
|
smoothScrollBy(scrollBy, duration);
|
|
}
|
|
|
|
@Override
|
|
public void stop() {
|
|
removeCallbacks(this);
|
|
}
|
|
|
|
@Override
|
|
public void run() {
|
|
final int listHeight = getHeight();
|
|
final int firstPos = mFirstPosition;
|
|
|
|
switch (mMode) {
|
|
case MOVE_DOWN_POS: {
|
|
final int lastViewIndex = getChildCount() - 1;
|
|
final int lastPos = firstPos + lastViewIndex;
|
|
|
|
if (lastViewIndex < 0) {
|
|
return;
|
|
}
|
|
|
|
if (lastPos == mLastSeenPos) {
|
|
// No new views, let things keep going.
|
|
postOnAnimation(this);
|
|
return;
|
|
}
|
|
|
|
final View lastView = getChildAt(lastViewIndex);
|
|
final int lastViewHeight = lastView.getHeight();
|
|
final int lastViewTop = lastView.getTop();
|
|
final int lastViewPixelsShowing = listHeight - lastViewTop;
|
|
final int extraScroll = lastPos < mItemCount - 1 ?
|
|
Math.max(mListPadding.bottom, mExtraScroll) : mListPadding.bottom;
|
|
|
|
final int scrollBy = lastViewHeight - lastViewPixelsShowing + extraScroll;
|
|
smoothScrollBy(scrollBy, mScrollDuration, true);
|
|
|
|
mLastSeenPos = lastPos;
|
|
if (lastPos < mTargetPos) {
|
|
postOnAnimation(this);
|
|
}
|
|
break;
|
|
}
|
|
|
|
case MOVE_DOWN_BOUND: {
|
|
final int nextViewIndex = 1;
|
|
final int childCount = getChildCount();
|
|
|
|
if (firstPos == mBoundPos || childCount <= nextViewIndex
|
|
|| firstPos + childCount >= mItemCount) {
|
|
return;
|
|
}
|
|
final int nextPos = firstPos + nextViewIndex;
|
|
|
|
if (nextPos == mLastSeenPos) {
|
|
// No new views, let things keep going.
|
|
postOnAnimation(this);
|
|
return;
|
|
}
|
|
|
|
final View nextView = getChildAt(nextViewIndex);
|
|
final int nextViewHeight = nextView.getHeight();
|
|
final int nextViewTop = nextView.getTop();
|
|
final int extraScroll = Math.max(mListPadding.bottom, mExtraScroll);
|
|
if (nextPos < mBoundPos) {
|
|
smoothScrollBy(Math.max(0, nextViewHeight + nextViewTop - extraScroll),
|
|
mScrollDuration, true);
|
|
|
|
mLastSeenPos = nextPos;
|
|
|
|
postOnAnimation(this);
|
|
} else {
|
|
if (nextViewTop > extraScroll) {
|
|
smoothScrollBy(nextViewTop - extraScroll, mScrollDuration, true);
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
|
|
case MOVE_UP_POS: {
|
|
if (firstPos == mLastSeenPos) {
|
|
// No new views, let things keep going.
|
|
postOnAnimation(this);
|
|
return;
|
|
}
|
|
|
|
final View firstView = getChildAt(0);
|
|
if (firstView == null) {
|
|
return;
|
|
}
|
|
final int firstViewTop = firstView.getTop();
|
|
final int extraScroll = firstPos > 0 ?
|
|
Math.max(mExtraScroll, mListPadding.top) : mListPadding.top;
|
|
|
|
smoothScrollBy(firstViewTop - extraScroll, mScrollDuration, true);
|
|
|
|
mLastSeenPos = firstPos;
|
|
|
|
if (firstPos > mTargetPos) {
|
|
postOnAnimation(this);
|
|
}
|
|
break;
|
|
}
|
|
|
|
case MOVE_UP_BOUND: {
|
|
final int lastViewIndex = getChildCount() - 2;
|
|
if (lastViewIndex < 0) {
|
|
return;
|
|
}
|
|
final int lastPos = firstPos + lastViewIndex;
|
|
|
|
if (lastPos == mLastSeenPos) {
|
|
// No new views, let things keep going.
|
|
postOnAnimation(this);
|
|
return;
|
|
}
|
|
|
|
final View lastView = getChildAt(lastViewIndex);
|
|
final int lastViewHeight = lastView.getHeight();
|
|
final int lastViewTop = lastView.getTop();
|
|
final int lastViewPixelsShowing = listHeight - lastViewTop;
|
|
final int extraScroll = Math.max(mListPadding.top, mExtraScroll);
|
|
mLastSeenPos = lastPos;
|
|
if (lastPos > mBoundPos) {
|
|
smoothScrollBy(-(lastViewPixelsShowing - extraScroll), mScrollDuration, true);
|
|
postOnAnimation(this);
|
|
} else {
|
|
final int bottom = listHeight - extraScroll;
|
|
final int lastViewBottom = lastViewTop + lastViewHeight;
|
|
if (bottom > lastViewBottom) {
|
|
smoothScrollBy(-(bottom - lastViewBottom), mScrollDuration, true);
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
|
|
case MOVE_OFFSET: {
|
|
if (mLastSeenPos == firstPos) {
|
|
// No new views, let things keep going.
|
|
postOnAnimation(this);
|
|
return;
|
|
}
|
|
|
|
mLastSeenPos = firstPos;
|
|
|
|
final int childCount = getChildCount();
|
|
final int position = mTargetPos;
|
|
final int lastPos = firstPos + childCount - 1;
|
|
|
|
int viewTravelCount = 0;
|
|
if (position < firstPos) {
|
|
viewTravelCount = firstPos - position + 1;
|
|
} else if (position > lastPos) {
|
|
viewTravelCount = position - lastPos;
|
|
}
|
|
|
|
// Estimate how many screens we should travel
|
|
final float screenTravelCount = (float) viewTravelCount / childCount;
|
|
|
|
final float modifier = Math.min(Math.abs(screenTravelCount), 1.f);
|
|
if (position < firstPos) {
|
|
final int distance = (int) (-getHeight() * modifier);
|
|
final int duration = (int) (mScrollDuration * modifier);
|
|
smoothScrollBy(distance, duration, true);
|
|
postOnAnimation(this);
|
|
} else if (position > lastPos) {
|
|
final int distance = (int) (getHeight() * modifier);
|
|
final int duration = (int) (mScrollDuration * modifier);
|
|
smoothScrollBy(distance, duration, true);
|
|
postOnAnimation(this);
|
|
} else {
|
|
// On-screen, just scroll.
|
|
final int targetTop = getChildAt(position - firstPos).getTop();
|
|
final int distance = targetTop - mOffsetFromTop;
|
|
final int duration = (int) (mScrollDuration *
|
|
((float) Math.abs(distance) / getHeight()));
|
|
smoothScrollBy(distance, duration, true);
|
|
}
|
|
break;
|
|
}
|
|
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|