The Tor Browser / file revision

 /* -*- 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.toolbar;

 import org.mozilla.gecko.animation.Rotate3DAnimation;

 import org.mozilla.gecko.R;

 import org.mozilla.gecko.widget.ThemedTextSwitcher;

 import android.content.Context;

 import android.os.Build;

 import android.view.accessibility.AccessibilityNodeInfo;

 import android.view.animation.Animation;

 import android.view.animation.AnimationSet;

 import android.view.animation.AlphaAnimation;

 import android.view.LayoutInflater;

 import android.view.View;

 import android.util.AttributeSet;

 import android.widget.ViewSwitcher;

 public class TabCounter extends ThemedTextSwitcher

                         implements ViewSwitcher.ViewFactory {

     private static final float CENTER_X = 0.5f;

     private static final float CENTER_Y = 1.25f;

     private static final int DURATION = 500;

     private static final float Z_DISTANCE = 200;

     private final AnimationSet mFlipInForward;

     private final AnimationSet mFlipInBackward;

     private final AnimationSet mFlipOutForward;

     private final AnimationSet mFlipOutBackward;

     private final LayoutInflater mInflater;

     private int mCount = 0;

     private enum FadeMode {

         FADE_IN,

         FADE_OUT

     }

     public TabCounter(Context context, AttributeSet attrs) {

         super(context, attrs);

         mInflater = LayoutInflater.from(context);

         mFlipInForward = createAnimation(-90, 0, FadeMode.FADE_IN, -1 * Z_DISTANCE, false);

         mFlipInBackward = createAnimation(90, 0, FadeMode.FADE_IN, Z_DISTANCE, false);

         mFlipOutForward = createAnimation(0, -90, FadeMode.FADE_OUT, -1 * Z_DISTANCE, true);

         mFlipOutBackward = createAnimation(0, 90, FadeMode.FADE_OUT, Z_DISTANCE, true);

         removeAllViews();

         setFactory(this);

         if (Build.VERSION.SDK_INT >= 16) {

             // This adds the TextSwitcher to the a11y node tree, where we in turn

             // could make it return an empty info node. If we don't do this the

             // TextSwitcher's child TextViews get picked up, and we don't want

             // that since the tabs ImageButton is already properly labeled for

             // accessibility.

             setImportantForAccessibility(View.IMPORTANT_FOR_ACCESSIBILITY_YES);

             setAccessibilityDelegate(new View.AccessibilityDelegate() {

                     @Override

                     public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfo info) {}

                 });

         }

     }

     void setCountWithAnimation(int count) {

         // Don't animate from initial state

         if (mCount == 0) {

             setCount(count);

             return;

         }

         if (mCount == count) {

             return;

         }

         if (count < mCount) {

             setInAnimation(mFlipInBackward);

             setOutAnimation(mFlipOutForward);

         } else {

             setInAnimation(mFlipInForward);

             setOutAnimation(mFlipOutBackward);

         }

         // Eliminate screen artifact. Set explicit In/Out animation pair order. This will always

         // animate pair in In->Out child order, prevent alternating use of the Out->In case.

         setDisplayedChild(0);

         // Set In value, trigger animation to Out value

         setCurrentText(String.valueOf(mCount));

         setText(String.valueOf(count));

         mCount = count;

     }

     void setCount(int count) {

         setCurrentText(String.valueOf(count));

         mCount = count;

     }

     // Alpha animations in editing mode cause action bar corruption on the

     // Nexus 7 (bug 961749). As a workaround, skip these animations in editing

     // mode.

     void onEnterEditingMode() {

         final int childCount = getChildCount();

         for (int i = 0; i < childCount; i++) {

             getChildAt(i).clearAnimation();

         }

     }

     private AnimationSet createAnimation(float startAngle, float endAngle,

                                          FadeMode fadeMode,

                                          float zEnd, boolean reverse) {

         final Context context = getContext();

         AnimationSet set = new AnimationSet(context, null);

         set.addAnimation(new Rotate3DAnimation(startAngle, endAngle, CENTER_X, CENTER_Y, zEnd, reverse));

         set.addAnimation(fadeMode == FadeMode.FADE_IN ? new AlphaAnimation(0.0f, 1.0f) :

                                                         new AlphaAnimation(1.0f, 0.0f));

         set.setDuration(DURATION);

         set.setInterpolator(context, android.R.anim.accelerate_interpolator);

         return set;

     }

     @Override

     public View makeView() {

         return mInflater.inflate(R.layout.tabs_counter, null);

     }

 }