The Tor Browser: mobile/android/base/home/TabMenuStripLayout.java@fc2d59ddac77 (annotated)

mobile/android/base/home/TabMenuStripLayout.java@fc2d59ddac77 (annotated)

mobile/android/base/home/TabMenuStripLayout.java

Wed, 31 Dec 2014 07:22:50 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 07:22:50 +0100
branch: TOR_BUG_3246
changeset 4: fc2d59ddac77
permissions: -rw-r--r--

Correct previous dual key logic pending first delivery installment.

 /* -*- Mode: Java; c-basic-offset: 4; tab-width: 4; 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.home;
 import org.mozilla.gecko.R;
 import android.content.Context;
 import android.content.res.TypedArray;
 import android.graphics.Canvas;
 import android.graphics.drawable.Drawable;
 import android.util.AttributeSet;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewTreeObserver;
 import android.view.accessibility.AccessibilityEvent;
 import android.widget.LinearLayout;
 import android.widget.TextView;
 /**
  * {@code TabMenuStripLayout} is the view that draws the {@code HomePager}
  * tabs that are displayed in {@code TabMenuStrip}.
  */
 class TabMenuStripLayout extends LinearLayout
                          implements View.OnFocusChangeListener {
     private HomePager.OnTitleClickListener onTitleClickListener;
     private Drawable strip;
     private View selectedView;
     // Data associated with the scrolling of the strip drawable.
     private View toTab;
     private View fromTab;
     private float progress;
     // This variable is used to predict the direction of scroll.
     private float prevProgress;
     TabMenuStripLayout(Context context, AttributeSet attrs) {
         super(context, attrs);
         TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.TabMenuStrip);
         final int stripResId = a.getResourceId(R.styleable.TabMenuStrip_strip, -1);
         a.recycle();
         if (stripResId != -1) {
             strip = getResources().getDrawable(stripResId);
         }
         setWillNotDraw(false);
     }
     void onAddPagerView(String title) {
         final TextView button = (TextView) LayoutInflater.from(getContext()).inflate(R.layout.tab_menu_strip, this, false);
         button.setText(title.toUpperCase());
         addView(button);
         button.setOnClickListener(new ViewClickListener(getChildCount() - 1));
         button.setOnFocusChangeListener(this);
     }
     void onPageSelected(final int position) {
         selectedView = getChildAt(position);
         // Callback to measure and draw the strip after the view is visible.
         ViewTreeObserver vto = selectedView.getViewTreeObserver();
         if (vto.isAlive()) {
             vto.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
                 @Override
                 public void onGlobalLayout() {
                     selectedView.getViewTreeObserver().removeGlobalOnLayoutListener(this);
                     if (strip != null) {
                         strip.setBounds(selectedView.getLeft(),
                                         selectedView.getTop(),
                                         selectedView.getRight(),
                                         selectedView.getBottom());
                     }
                     prevProgress = position;
                 }
             });
         }
     }
     // Page scroll animates the drawable and its bounds from the previous to next child view.
     void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
         if (strip == null) {
             return;
         }
         setScrollingData(position, positionOffset);
         if (fromTab == null || toTab == null) {
             return;
         }
         final int fromTabLeft =  fromTab.getLeft();
         final int fromTabRight = fromTab.getRight();
         final int toTabLeft =  toTab.getLeft();
         final int toTabRight = toTab.getRight();
         strip.setBounds((int) (fromTabLeft + ((toTabLeft - fromTabLeft) * progress)),
 ,
                          (int) (fromTabRight + ((toTabRight - fromTabRight) * progress)),
                          getHeight());
         invalidate();
     }
     /*
      * position + positionOffset goes from 0 to 2 as we scroll from page 1 to 3.
      * Normalized progress is relative to the the direction the page is being scrolled towards.
      * For this, we maintain direction of scroll with a state, and the child view we are moving towards and away from.
      */
     void setScrollingData(int position, float positionOffset) {
         if (position >= getChildCount() - 1) {
             return;
         }
         final float currProgress = position + positionOffset;
         if (prevProgress > currProgress) {
             toTab = getChildAt(position);
             fromTab = getChildAt(position + 1);
             progress = 1 - positionOffset;
         } else {
             toTab = getChildAt(position + 1);
             fromTab = getChildAt(position);
             progress = positionOffset;
         }
         prevProgress = currProgress;
     }
     @Override
     public void onDraw(Canvas canvas) {
         super.onDraw(canvas);
         if (strip != null) {
             strip.draw(canvas);
         }
     }
     @Override
     public void onFocusChange(View v, boolean hasFocus) {
         if (v == this && hasFocus && getChildCount() > 0) {
             selectedView.requestFocus();
             return;
         }
         if (!hasFocus) {
             return;
         }
         int i = 0;
         final int numTabs = getChildCount();
         while (i < numTabs) {
             View view = getChildAt(i);
             if (view == v) {
                 view.requestFocus();
                 if (isShown()) {
                     // A view is focused so send an event to announce the menu strip state.
                     sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_FOCUSED);
                 }
                 break;
             }
             i++;
         }
     }
     void setOnTitleClickListener(HomePager.OnTitleClickListener onTitleClickListener) {
         this.onTitleClickListener = onTitleClickListener;
     }
     private class ViewClickListener implements OnClickListener {
         private final int mIndex;
         public ViewClickListener(int index) {
             mIndex = index;
         }
         @Override
         public void onClick(View view) {
             if (onTitleClickListener != null) {
                 onTitleClickListener.onTitleClicked(mIndex);
             }
         }
     }
 }

The Tor Browser / annotate

mobile/android/base/home/TabMenuStripLayout.java@fc2d59ddac77 (annotated)

mobile/android/base/home/TabMenuStripLayout.java