mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
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472 lines
18 KiB
Java
472 lines
18 KiB
Java
/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla Android code.
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*
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* The Initial Developer of the Original Code is Mozilla Foundation.
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* Portions created by the Initial Developer are Copyright (C) 2009-2010
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Patrick Walton <pcwalton@mozilla.com>
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* Chris Lord <chrislord.net@gmail.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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package org.mozilla.gecko.gfx;
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import org.mozilla.gecko.gfx.IntSize;
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import org.mozilla.gecko.gfx.Layer;
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import org.mozilla.gecko.gfx.LayerClient;
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import org.mozilla.gecko.gfx.LayerView;
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import org.mozilla.gecko.ui.PanZoomController;
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import org.mozilla.gecko.ui.SimpleScaleGestureDetector;
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import org.mozilla.gecko.GeckoApp;
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import org.mozilla.gecko.GeckoEvent;
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import android.content.Context;
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import android.content.res.Resources;
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import android.graphics.Bitmap;
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import android.graphics.BitmapFactory;
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import android.graphics.Matrix;
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import android.graphics.Point;
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import android.graphics.PointF;
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import android.graphics.Rect;
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import android.graphics.RectF;
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import android.util.Log;
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import android.view.MotionEvent;
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import android.view.GestureDetector;
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import android.view.ScaleGestureDetector;
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import android.view.View.OnTouchListener;
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import java.lang.Math;
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import java.util.Timer;
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import java.util.TimerTask;
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/**
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* The layer controller manages a tile that represents the visible page. It does panning and
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* zooming natively by delegating to a panning/zooming controller. Touch events can be dispatched
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* to a higher-level view.
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*
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* Many methods require that the monitor be held, with a synchronized (controller) { ... } block.
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*/
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public class LayerController {
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private static final String LOGTAG = "GeckoLayerController";
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private Layer mRootLayer; /* The root layer. */
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private LayerView mView; /* The main rendering view. */
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private Context mContext; /* The current context. */
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private ViewportMetrics mViewportMetrics; /* The current viewport metrics. */
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private boolean mWaitForTouchListeners;
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private PanZoomController mPanZoomController;
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/*
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* The panning and zooming controller, which interprets pan and zoom gestures for us and
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* updates our visible rect appropriately.
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*/
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private OnTouchListener mOnTouchListener; /* The touch listener. */
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private LayerClient mLayerClient; /* The layer client. */
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/* The new color for the checkerboard. */
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private int mCheckerboardColor;
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private boolean mForceRedraw;
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/* The extra area on the sides of the page that we want to buffer to help with
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* smooth, asynchronous scrolling. Depending on a device's support for NPOT
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* textures, this may be rounded up to the nearest power of two.
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*/
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public static final IntSize MIN_BUFFER = new IntSize(512, 1024);
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/* If the visible rect is within the danger zone (measured in pixels from each edge of a tile),
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* we start aggressively redrawing to minimize checkerboarding. */
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private static final int DANGER_ZONE_X = 75;
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private static final int DANGER_ZONE_Y = 150;
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/* The time limit for pages to respond with preventDefault on touchevents
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* before we begin panning the page */
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private static final int PREVENT_DEFAULT_TIMEOUT = 200;
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private boolean allowDefaultActions = true;
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private Timer allowDefaultTimer = null;
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private boolean inTouchSession = false;
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private PointF initialTouchLocation = null;
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public LayerController(Context context) {
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mContext = context;
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mForceRedraw = true;
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mViewportMetrics = new ViewportMetrics();
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mPanZoomController = new PanZoomController(this);
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mView = new LayerView(context, this);
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}
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public void setRoot(Layer layer) { mRootLayer = layer; }
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public void setLayerClient(LayerClient layerClient) {
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mLayerClient = layerClient;
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layerClient.setLayerController(this);
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}
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public void setForceRedraw() {
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mForceRedraw = true;
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}
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public LayerClient getLayerClient() { return mLayerClient; }
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public Layer getRoot() { return mRootLayer; }
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public LayerView getView() { return mView; }
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public Context getContext() { return mContext; }
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public ViewportMetrics getViewportMetrics() { return mViewportMetrics; }
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public RectF getViewport() {
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return mViewportMetrics.getViewport();
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}
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public FloatSize getViewportSize() {
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return mViewportMetrics.getSize();
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}
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public FloatSize getPageSize() {
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return mViewportMetrics.getPageSize();
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}
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public PointF getOrigin() {
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return mViewportMetrics.getOrigin();
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}
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public float getZoomFactor() {
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return mViewportMetrics.getZoomFactor();
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}
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public Bitmap getBackgroundPattern() { return getDrawable("background"); }
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public Bitmap getShadowPattern() { return getDrawable("shadow"); }
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public PanZoomController getPanZoomController() { return mPanZoomController; }
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public GestureDetector.OnGestureListener getGestureListener() { return mPanZoomController; }
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public SimpleScaleGestureDetector.SimpleScaleGestureListener getScaleGestureListener() {
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return mPanZoomController;
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}
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public GestureDetector.OnDoubleTapListener getDoubleTapListener() { return mPanZoomController; }
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private Bitmap getDrawable(String name) {
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Resources resources = mContext.getResources();
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int resourceID = resources.getIdentifier(name, "drawable", mContext.getPackageName());
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BitmapFactory.Options options = new BitmapFactory.Options();
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options.inScaled = false;
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return BitmapFactory.decodeResource(mContext.getResources(), resourceID, options);
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}
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/**
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* The view calls this function to indicate that the viewport changed size. It must hold the
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* monitor while calling it.
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*
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* TODO: Refactor this to use an interface. Expose that interface only to the view and not
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* to the layer client. That way, the layer client won't be tempted to call this, which might
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* result in an infinite loop.
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*/
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public void setViewportSize(FloatSize size) {
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// Resize the viewport, and modify its zoom factor so that the page retains proportionally
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// zoomed relative to the screen.
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float oldHeight = mViewportMetrics.getSize().height;
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float oldWidth = mViewportMetrics.getSize().width;
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float oldZoomFactor = mViewportMetrics.getZoomFactor();
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mViewportMetrics.setSize(size);
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// if the viewport got larger (presumably because the vkb went away), and the page
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// is smaller than the new viewport size, increase the page size so that the panzoomcontroller
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// doesn't zoom in to make it fit (bug 718270). this page size change is in anticipation of
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// gecko increasing the page size to match the new viewport size, which will happen the next
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// time we get a draw update.
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if (size.width >= oldWidth && size.height >= oldHeight) {
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FloatSize pageSize = mViewportMetrics.getPageSize();
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if (pageSize.width < size.width || pageSize.height < size.height) {
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mViewportMetrics.setPageSize(new FloatSize(Math.max(pageSize.width, size.width),
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Math.max(pageSize.height, size.height)));
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}
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}
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PointF newFocus = new PointF(size.width / 2.0f, size.height / 2.0f);
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float newZoomFactor = size.width * oldZoomFactor / oldWidth;
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mViewportMetrics.scaleTo(newZoomFactor, newFocus);
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Log.d(LOGTAG, "setViewportSize: " + mViewportMetrics);
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setForceRedraw();
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if (mLayerClient != null)
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mLayerClient.viewportSizeChanged();
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notifyLayerClientOfGeometryChange();
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mPanZoomController.abortAnimation();
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mView.requestRender();
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}
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/** Scrolls the viewport by the given offset. You must hold the monitor while calling this. */
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public void scrollBy(PointF point) {
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PointF origin = mViewportMetrics.getOrigin();
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origin.offset(point.x, point.y);
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mViewportMetrics.setOrigin(origin);
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Log.d(LOGTAG, "scrollBy: " + mViewportMetrics);
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notifyLayerClientOfGeometryChange();
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GeckoApp.mAppContext.repositionPluginViews(false);
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mView.requestRender();
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}
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/** Sets the current page size. You must hold the monitor while calling this. */
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public void setPageSize(FloatSize size) {
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if (mViewportMetrics.getPageSize().fuzzyEquals(size))
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return;
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mViewportMetrics.setPageSize(size);
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Log.d(LOGTAG, "setPageSize: " + mViewportMetrics);
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// Page size is owned by the LayerClient, so no need to notify it of
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// this change.
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mView.post(new Runnable() {
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public void run() {
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mPanZoomController.pageSizeUpdated();
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mView.requestRender();
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}
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});
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}
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/**
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* Sets the entire viewport metrics at once. This function does not notify the layer client or
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* the pan/zoom controller, so you will need to call notifyLayerClientOfGeometryChange() or
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* notifyPanZoomControllerOfGeometryChange() after calling this. You must hold the monitor
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* while calling this.
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*/
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public void setViewportMetrics(ViewportMetrics viewport) {
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mViewportMetrics = new ViewportMetrics(viewport);
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Log.d(LOGTAG, "setViewportMetrics: " + mViewportMetrics);
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// this function may or may not be called on the UI thread,
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// but repositionPluginViews must only be called on the UI thread.
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GeckoApp.mAppContext.runOnUiThread(new Runnable() {
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public void run() {
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GeckoApp.mAppContext.repositionPluginViews(false);
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}
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});
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mView.requestRender();
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}
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/**
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* Scales the viewport, keeping the given focus point in the same place before and after the
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* scale operation. You must hold the monitor while calling this.
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*/
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public void scaleWithFocus(float zoomFactor, PointF focus) {
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mViewportMetrics.scaleTo(zoomFactor, focus);
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Log.d(LOGTAG, "scaleWithFocus: " + mViewportMetrics + "; zf=" + zoomFactor);
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// We assume the zoom level will only be modified by the
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// PanZoomController, so no need to notify it of this change.
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notifyLayerClientOfGeometryChange();
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GeckoApp.mAppContext.repositionPluginViews(false);
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mView.requestRender();
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}
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public boolean post(Runnable action) { return mView.post(action); }
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public void setOnTouchListener(OnTouchListener onTouchListener) {
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mOnTouchListener = onTouchListener;
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}
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/**
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* The view as well as the controller itself use this method to notify the layer client that
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* the geometry changed.
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*/
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public void notifyLayerClientOfGeometryChange() {
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if (mLayerClient != null)
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mLayerClient.geometryChanged();
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}
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/** Aborts any pan/zoom animation that is currently in progress. */
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public void abortPanZoomAnimation() {
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if (mPanZoomController != null) {
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mView.post(new Runnable() {
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public void run() {
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mPanZoomController.abortAnimation();
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}
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});
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}
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}
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/**
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* Returns true if this controller is fine with performing a redraw operation or false if it
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* would prefer that the action didn't take place.
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*/
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public boolean getRedrawHint() {
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if (mForceRedraw) {
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mForceRedraw = false;
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return true;
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}
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return aboutToCheckerboard() && mPanZoomController.getRedrawHint();
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}
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private RectF getTileRect() {
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if (mRootLayer == null)
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return new RectF();
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float x = mRootLayer.getOrigin().x, y = mRootLayer.getOrigin().y;
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IntSize layerSize = mRootLayer.getSize();
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return new RectF(x, y, x + layerSize.width, y + layerSize.height);
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}
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public RectF restrictToPageSize(RectF aRect) {
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FloatSize pageSize = getPageSize();
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return RectUtils.restrict(aRect, new RectF(0, 0, pageSize.width, pageSize.height));
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}
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// Returns true if a checkerboard is about to be visible.
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private boolean aboutToCheckerboard() {
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// Increase the size of the viewport (and clamp to page boundaries), and
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// intersect it with the tile's displayport to determine whether we're
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// close to checkerboarding.
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FloatSize pageSize = getPageSize();
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RectF adjustedViewport = RectUtils.expand(getViewport(), DANGER_ZONE_X, DANGER_ZONE_Y);
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if (adjustedViewport.top < 0) adjustedViewport.top = 0;
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if (adjustedViewport.left < 0) adjustedViewport.left = 0;
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if (adjustedViewport.right > pageSize.width) adjustedViewport.right = pageSize.width;
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if (adjustedViewport.bottom > pageSize.height) adjustedViewport.bottom = pageSize.height;
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return !getTileRect().contains(adjustedViewport);
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}
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/**
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* Converts a point from layer view coordinates to layer coordinates. In other words, given a
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* point measured in pixels from the top left corner of the layer view, returns the point in
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* pixels measured from the top left corner of the root layer, in the coordinate system of the
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* layer itself. This method is used by the viewport controller as part of the process of
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* translating touch events to Gecko's coordinate system.
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*/
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public PointF convertViewPointToLayerPoint(PointF viewPoint) {
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if (mRootLayer == null)
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return null;
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// Undo the transforms.
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PointF origin = mViewportMetrics.getOrigin();
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PointF newPoint = new PointF(origin.x, origin.y);
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newPoint.offset(viewPoint.x, viewPoint.y);
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Point rootOrigin = mRootLayer.getOrigin();
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newPoint.offset(-rootOrigin.x, -rootOrigin.y);
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return newPoint;
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}
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/*
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* Gesture detection. This is handled only at a high level in this class; we dispatch to the
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* pan/zoom controller to do the dirty work.
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*/
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public boolean onTouchEvent(MotionEvent event) {
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int action = event.getAction();
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PointF point = new PointF(event.getX(), event.getY());
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if ((action & MotionEvent.ACTION_MASK) == MotionEvent.ACTION_DOWN) {
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mView.clearEventQueue();
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initialTouchLocation = point;
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allowDefaultActions = !mWaitForTouchListeners;
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post(new Runnable() {
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public void run() {
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preventPanning(mWaitForTouchListeners);
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}
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});
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}
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if (initialTouchLocation != null && (action & MotionEvent.ACTION_MASK) == MotionEvent.ACTION_MOVE) {
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if (PointUtils.subtract(point, initialTouchLocation).length() > PanZoomController.PAN_THRESHOLD * 240) {
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initialTouchLocation = null;
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} else {
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return !allowDefaultActions;
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}
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}
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if (mOnTouchListener != null)
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mOnTouchListener.onTouch(mView, event);
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if (!mWaitForTouchListeners)
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return !allowDefaultActions;
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switch (action & MotionEvent.ACTION_MASK) {
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case MotionEvent.ACTION_MOVE: {
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if (!inTouchSession && allowDefaultTimer == null) {
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inTouchSession = true;
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allowDefaultTimer = new Timer();
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allowDefaultTimer.schedule(new TimerTask() {
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public void run() {
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post(new Runnable() {
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public void run() {
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preventPanning(false);
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}
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});
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}
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}, PREVENT_DEFAULT_TIMEOUT);
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}
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break;
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}
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case MotionEvent.ACTION_CANCEL:
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case MotionEvent.ACTION_UP: {
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inTouchSession = false;
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}
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}
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return !allowDefaultActions;
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}
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public void preventPanning(boolean aValue) {
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if (allowDefaultTimer != null) {
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allowDefaultTimer.cancel();
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allowDefaultTimer.purge();
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allowDefaultTimer = null;
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}
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if (aValue == allowDefaultActions) {
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allowDefaultActions = !aValue;
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if (aValue) {
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mView.clearEventQueue();
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mPanZoomController.cancelTouch();
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} else {
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mView.processEventQueue();
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}
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}
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}
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public void setWaitForTouchListeners(boolean aValue) {
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mWaitForTouchListeners = aValue;
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}
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/** Retrieves the color that the checkerboard should be. */
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public int getCheckerboardColor() {
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return mCheckerboardColor;
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}
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/** Sets a new color for the checkerboard. */
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public void setCheckerboardColor(int newColor) {
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mCheckerboardColor = newColor;
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mView.requestRender();
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}
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}
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