gecko/mobile/android/base/menu/MenuPopup.java

118 lines
4.3 KiB
Java

/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
package org.mozilla.gecko.menu;
import org.mozilla.gecko.R;
import android.content.Context;
import android.content.res.Resources;
import android.graphics.Color;
import android.graphics.drawable.ColorDrawable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.PopupWindow;
import android.widget.RelativeLayout;
import android.widget.RelativeLayout.LayoutParams;
/**
* A popup to show the inflated MenuPanel. This has an arrow pointing to the anchor.
*/
public class MenuPopup extends PopupWindow {
private Resources mResources;
private ImageView mArrowTop;
private ImageView mArrowBottom;
private RelativeLayout mPanel;
private int mYOffset;
private int mArrowMargin;
private int mPopupWidth;
private boolean mShowArrow;
public MenuPopup(Context context) {
super(context);
mResources = context.getResources();
setFocusable(true);
mYOffset = mResources.getDimensionPixelSize(R.dimen.menu_popup_offset);
mArrowMargin = mResources.getDimensionPixelSize(R.dimen.menu_popup_arrow_margin);
mPopupWidth = mResources.getDimensionPixelSize(R.dimen.menu_popup_width);
// Setting a null background makes the popup to not close on touching outside.
setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
setWindowLayoutMode(View.MeasureSpec.makeMeasureSpec(mPopupWidth, View.MeasureSpec.AT_MOST),
ViewGroup.LayoutParams.WRAP_CONTENT);
LayoutInflater inflater = LayoutInflater.from(context);
RelativeLayout layout = (RelativeLayout) inflater.inflate(R.layout.menu_popup, null);
setContentView(layout);
mArrowTop = (ImageView) layout.findViewById(R.id.menu_arrow_top);
mArrowBottom = (ImageView) layout.findViewById(R.id.menu_arrow_bottom);
mPanel = (RelativeLayout) layout.findViewById(R.id.menu_panel);
mShowArrow = true;
setAnimationStyle(R.style.PopupAnimation);
}
/**
* Adds the panel with the menu to its content.
*
* @param view The panel view with the menu to be shown.
*/
public void setPanelView(View view) {
mPanel.removeAllViews();
mPanel.addView(view);
mPanel.measure(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
}
/**
* Show/hide the arrow pointing to the anchor.
*
* @param show Show/hide the arrow.
*/
public void showArrowToAnchor(boolean show) {
mShowArrow = show;
}
/**
* A small little offset for the arrow to overlap the anchor.
*/
@Override
public void showAsDropDown(View anchor) {
if (!mShowArrow) {
mArrowTop.setVisibility(View.GONE);
mArrowBottom.setVisibility(View.GONE);
showAsDropDown(anchor, 0, -mYOffset);
return;
}
int[] anchorLocation = new int[2];
anchor.getLocationOnScreen(anchorLocation);
int screenWidth = mResources.getDisplayMetrics().widthPixels;
int arrowWidth = mResources.getDimensionPixelSize(R.dimen.menu_popup_arrow_width);
int arrowOffset = (anchor.getWidth() - arrowWidth)/2;
if (anchorLocation[0] + mPopupWidth <= screenWidth) {
// left align
((LayoutParams) mArrowTop.getLayoutParams()).rightMargin = mPopupWidth - anchor.getWidth() + arrowOffset;
((LayoutParams) mArrowBottom.getLayoutParams()).rightMargin = mPopupWidth - anchor.getWidth() + arrowOffset;
} else {
// right align
((LayoutParams) mArrowTop.getLayoutParams()).rightMargin = screenWidth - anchorLocation[0] - anchor.getWidth()/2 - arrowWidth/2;
((LayoutParams) mArrowBottom.getLayoutParams()).rightMargin = mArrowMargin;
}
// shown below anchor
mArrowTop.setVisibility(View.VISIBLE);
mArrowBottom.setVisibility(View.GONE);
showAsDropDown(anchor, 0, -mYOffset);
}
}