michael@0: /* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
michael@0:  * This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: package org.mozilla.gecko.widget;
michael@0: 
michael@0: import org.mozilla.gecko.GeckoApp;
michael@0: import org.mozilla.gecko.R;
michael@0: import org.mozilla.gecko.util.HardwareUtils;
michael@0: 
michael@0: import android.content.res.Resources;
michael@0: import android.graphics.drawable.BitmapDrawable;
michael@0: import android.os.Build;
michael@0: import android.view.Gravity;
michael@0: import android.view.LayoutInflater;
michael@0: import android.view.View;
michael@0: import android.view.ViewGroup;
michael@0: import android.widget.ImageView;
michael@0: import android.widget.LinearLayout;
michael@0: import android.widget.PopupWindow;
michael@0: import android.widget.RelativeLayout;
michael@0: 
michael@0: public class ArrowPopup extends PopupWindow {
michael@0:     protected final GeckoApp mActivity;
michael@0: 
michael@0:     private View mAnchor;
michael@0:     private ImageView mArrow;
michael@0: 
michael@0:     private int mArrowWidth;
michael@0:     private int mYOffset;
michael@0: 
michael@0:     protected LinearLayout mContent;
michael@0:     protected boolean mInflated;
michael@0: 
michael@0:     public ArrowPopup(GeckoApp aActivity) {
michael@0:         this(aActivity, null);
michael@0:     }
michael@0: 
michael@0:     public ArrowPopup(GeckoApp activity, View anchor) {
michael@0:         super(activity);
michael@0:         mActivity = activity;
michael@0:         mAnchor = anchor;
michael@0: 
michael@0:         mInflated = false;
michael@0: 
michael@0:         final Resources res = activity.getResources();
michael@0:         mArrowWidth = res.getDimensionPixelSize(R.dimen.menu_popup_arrow_width);
michael@0:         mYOffset = res.getDimensionPixelSize(R.dimen.menu_popup_arrow_offset);
michael@0: 
michael@0:         setAnimationStyle(R.style.PopupAnimation);
michael@0:     }
michael@0: 
michael@0:     public void setAnchor(View anchor) {
michael@0:         mAnchor = anchor;
michael@0:     }
michael@0: 
michael@0:     protected void init() {
michael@0:         setBackgroundDrawable(new BitmapDrawable());
michael@0:         setOutsideTouchable(true);
michael@0: 
michael@0:         setWindowLayoutMode(HardwareUtils.isTablet() ? ViewGroup.LayoutParams.WRAP_CONTENT : ViewGroup.LayoutParams.FILL_PARENT,
michael@0:             ViewGroup.LayoutParams.WRAP_CONTENT);
michael@0: 
michael@0:         LayoutInflater inflater = LayoutInflater.from(mActivity);
michael@0:         RelativeLayout layout = (RelativeLayout) inflater.inflate(R.layout.arrow_popup, null);
michael@0:         setContentView(layout);
michael@0: 
michael@0:         mArrow = (ImageView) layout.findViewById(R.id.arrow);
michael@0:         mContent = (LinearLayout) layout.findViewById(R.id.content);
michael@0: 
michael@0:         mInflated = true;
michael@0:     }
michael@0: 
michael@0:     /*
michael@0:      * Shows the popup with the arrow pointing to the center of the anchor view. If an anchor hasn't
michael@0:      * been set or isn't visible, the popup will just be shown at the top of the gecko app view.
michael@0:      */
michael@0:     public void show() {
michael@0:         int[] anchorLocation = new int[2];
michael@0:         if (mAnchor != null)
michael@0:             mAnchor.getLocationInWindow(anchorLocation);
michael@0: 
michael@0:         // If there's no anchor or the anchor is out of the window bounds,
michael@0:         // just show the popup at the top of the gecko app view.
michael@0:         if (mAnchor == null || anchorLocation[1] < 0) {
michael@0:             final View view = mActivity.getView();
michael@0: 
michael@0:             // Bug in android code causes the window layout parameters to be ignored
michael@0:             // when using showAtLocation() in Gingerbread phones.
michael@0:             if (Build.VERSION.SDK_INT < 11) {
michael@0:                 setWidth(view.getWidth());
michael@0:                 setHeight(view.getHeight());
michael@0:             }
michael@0: 
michael@0:             showAtLocation(view, Gravity.TOP, 0, 0);
michael@0:             return;
michael@0:         }
michael@0: 
michael@0:         // Remove padding from the width of the anchor when calculating the arrow offset.
michael@0:         int anchorWidth = mAnchor.getWidth() - mAnchor.getPaddingLeft() - mAnchor.getPaddingRight();
michael@0:         // This is the difference between the edge of the anchor view and the edge of the arrow view.
michael@0:         // We're making an assumption here that the anchor view is wider than the arrow view.
michael@0:         int arrowOffset = (anchorWidth - mArrowWidth)/2 + mAnchor.getPaddingLeft();
michael@0: 
michael@0:         // The horizontal offset of the popup window, relative to the left side of the anchor view.
michael@0:         int offset = 0;
michael@0: 
michael@0:         RelativeLayout.LayoutParams arrowLayoutParams = (RelativeLayout.LayoutParams) mArrow.getLayoutParams();
michael@0: 
michael@0:         if (HardwareUtils.isTablet()) {
michael@0:             // On tablets, the popup has a fixed width, so we use a horizontal offset to position it.
michael@0:             // The arrow's left margin is set by the arrow_popup.xml layout file.
michael@0:             // This assumes that anchor is not too close to the right side of the screen.
michael@0:             offset = arrowOffset - arrowLayoutParams.leftMargin;
michael@0:         } else {
michael@0:             // On phones, the popup takes up the width of the screen, so we set the arrow's left
michael@0:             // margin to make it line up with the anchor.
michael@0:             int leftMargin = anchorLocation[0] + arrowOffset;
michael@0:             arrowLayoutParams.setMargins(leftMargin, 0, 0, 0);
michael@0:         }
michael@0: 
michael@0:         if (isShowing()) {
michael@0:             update(mAnchor, offset, -mYOffset, -1, -1);
michael@0:         } else {
michael@0:             showAsDropDown(mAnchor, offset, -mYOffset);
michael@0:         }
michael@0:     }
michael@0: }