The Tor Browser: mobile/android/base/widget/ArrowPopup.java@fc2d59ddac77

     1 /* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-

     2  * This Source Code Form is subject to the terms of the Mozilla Public

     3  * License, v. 2.0. If a copy of the MPL was not distributed with this

     4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     6 package org.mozilla.gecko.widget;

     8 import org.mozilla.gecko.GeckoApp;

     9 import org.mozilla.gecko.R;

    10 import org.mozilla.gecko.util.HardwareUtils;

    12 import android.content.res.Resources;

    13 import android.graphics.drawable.BitmapDrawable;

    14 import android.os.Build;

    15 import android.view.Gravity;

    16 import android.view.LayoutInflater;

    17 import android.view.View;

    18 import android.view.ViewGroup;

    19 import android.widget.ImageView;

    20 import android.widget.LinearLayout;

    21 import android.widget.PopupWindow;

    22 import android.widget.RelativeLayout;

    24 public class ArrowPopup extends PopupWindow {

    25     protected final GeckoApp mActivity;

    27     private View mAnchor;

    28     private ImageView mArrow;

    30     private int mArrowWidth;

    31     private int mYOffset;

    33     protected LinearLayout mContent;

    34     protected boolean mInflated;

    36     public ArrowPopup(GeckoApp aActivity) {

    37         this(aActivity, null);

    38     }

    40     public ArrowPopup(GeckoApp activity, View anchor) {

    41         super(activity);

    42         mActivity = activity;

    43         mAnchor = anchor;

    45         mInflated = false;

    47         final Resources res = activity.getResources();

    48         mArrowWidth = res.getDimensionPixelSize(R.dimen.menu_popup_arrow_width);

    49         mYOffset = res.getDimensionPixelSize(R.dimen.menu_popup_arrow_offset);

    51         setAnimationStyle(R.style.PopupAnimation);

    52     }

    54     public void setAnchor(View anchor) {

    55         mAnchor = anchor;

    56     }

    58     protected void init() {

    59         setBackgroundDrawable(new BitmapDrawable());

    60         setOutsideTouchable(true);

    62         setWindowLayoutMode(HardwareUtils.isTablet() ? ViewGroup.LayoutParams.WRAP_CONTENT : ViewGroup.LayoutParams.FILL_PARENT,

    63             ViewGroup.LayoutParams.WRAP_CONTENT);

    65         LayoutInflater inflater = LayoutInflater.from(mActivity);

    66         RelativeLayout layout = (RelativeLayout) inflater.inflate(R.layout.arrow_popup, null);

    67         setContentView(layout);

    69         mArrow = (ImageView) layout.findViewById(R.id.arrow);

    70         mContent = (LinearLayout) layout.findViewById(R.id.content);

    72         mInflated = true;

    73     }

    75     /*

    76      * Shows the popup with the arrow pointing to the center of the anchor view. If an anchor hasn't

    77      * been set or isn't visible, the popup will just be shown at the top of the gecko app view.

    78      */

    79     public void show() {

    80         int[] anchorLocation = new int[2];

    81         if (mAnchor != null)

    82             mAnchor.getLocationInWindow(anchorLocation);

    84         // If there's no anchor or the anchor is out of the window bounds,

    85         // just show the popup at the top of the gecko app view.

    86         if (mAnchor == null || anchorLocation[1] < 0) {

    87             final View view = mActivity.getView();

    89             // Bug in android code causes the window layout parameters to be ignored

    90             // when using showAtLocation() in Gingerbread phones.

    91             if (Build.VERSION.SDK_INT < 11) {

    92                 setWidth(view.getWidth());

    93                 setHeight(view.getHeight());

    94             }

    96             showAtLocation(view, Gravity.TOP, 0, 0);

    97             return;

    98         }

   100         // Remove padding from the width of the anchor when calculating the arrow offset.

   101         int anchorWidth = mAnchor.getWidth() - mAnchor.getPaddingLeft() - mAnchor.getPaddingRight();

   102         // This is the difference between the edge of the anchor view and the edge of the arrow view.

   103         // We're making an assumption here that the anchor view is wider than the arrow view.

   104         int arrowOffset = (anchorWidth - mArrowWidth)/2 + mAnchor.getPaddingLeft();

   106         // The horizontal offset of the popup window, relative to the left side of the anchor view.

   107         int offset = 0;

   109         RelativeLayout.LayoutParams arrowLayoutParams = (RelativeLayout.LayoutParams) mArrow.getLayoutParams();

   111         if (HardwareUtils.isTablet()) {

   112             // On tablets, the popup has a fixed width, so we use a horizontal offset to position it.

   113             // The arrow's left margin is set by the arrow_popup.xml layout file.

   114             // This assumes that anchor is not too close to the right side of the screen.

   115             offset = arrowOffset - arrowLayoutParams.leftMargin;

   116         } else {

   117             // On phones, the popup takes up the width of the screen, so we set the arrow's left

   118             // margin to make it line up with the anchor.

   119             int leftMargin = anchorLocation[0] + arrowOffset;

   120             arrowLayoutParams.setMargins(leftMargin, 0, 0, 0);

   121         }

   123         if (isShowing()) {

   124             update(mAnchor, offset, -mYOffset, -1, -1);

   125         } else {

   126             showAsDropDown(mAnchor, offset, -mYOffset);

   127         }

   128     }

   129 }

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