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.toolbar;
michael@0: 
michael@0: import org.mozilla.gecko.animation.Rotate3DAnimation;
michael@0: import org.mozilla.gecko.R;
michael@0: import org.mozilla.gecko.widget.ThemedTextSwitcher;
michael@0: 
michael@0: import android.content.Context;
michael@0: import android.os.Build;
michael@0: import android.view.accessibility.AccessibilityNodeInfo;
michael@0: import android.view.animation.Animation;
michael@0: import android.view.animation.AnimationSet;
michael@0: import android.view.animation.AlphaAnimation;
michael@0: import android.view.LayoutInflater;
michael@0: import android.view.View;
michael@0: import android.util.AttributeSet;
michael@0: import android.widget.ViewSwitcher;
michael@0: 
michael@0: public class TabCounter extends ThemedTextSwitcher
michael@0:                         implements ViewSwitcher.ViewFactory {
michael@0: 
michael@0:     private static final float CENTER_X = 0.5f;
michael@0:     private static final float CENTER_Y = 1.25f;
michael@0:     private static final int DURATION = 500;
michael@0:     private static final float Z_DISTANCE = 200;
michael@0: 
michael@0:     private final AnimationSet mFlipInForward;
michael@0:     private final AnimationSet mFlipInBackward;
michael@0:     private final AnimationSet mFlipOutForward;
michael@0:     private final AnimationSet mFlipOutBackward;
michael@0:     private final LayoutInflater mInflater;
michael@0: 
michael@0:     private int mCount = 0;
michael@0: 
michael@0:     private enum FadeMode {
michael@0:         FADE_IN,
michael@0:         FADE_OUT
michael@0:     }
michael@0: 
michael@0:     public TabCounter(Context context, AttributeSet attrs) {
michael@0:         super(context, attrs);
michael@0:         mInflater = LayoutInflater.from(context);
michael@0: 
michael@0:         mFlipInForward = createAnimation(-90, 0, FadeMode.FADE_IN, -1 * Z_DISTANCE, false);
michael@0:         mFlipInBackward = createAnimation(90, 0, FadeMode.FADE_IN, Z_DISTANCE, false);
michael@0:         mFlipOutForward = createAnimation(0, -90, FadeMode.FADE_OUT, -1 * Z_DISTANCE, true);
michael@0:         mFlipOutBackward = createAnimation(0, 90, FadeMode.FADE_OUT, Z_DISTANCE, true);
michael@0: 
michael@0:         removeAllViews();
michael@0:         setFactory(this);
michael@0: 
michael@0:         if (Build.VERSION.SDK_INT >= 16) {
michael@0:             // This adds the TextSwitcher to the a11y node tree, where we in turn
michael@0:             // could make it return an empty info node. If we don't do this the
michael@0:             // TextSwitcher's child TextViews get picked up, and we don't want
michael@0:             // that since the tabs ImageButton is already properly labeled for
michael@0:             // accessibility.
michael@0:             setImportantForAccessibility(View.IMPORTANT_FOR_ACCESSIBILITY_YES);
michael@0:             setAccessibilityDelegate(new View.AccessibilityDelegate() {
michael@0:                     @Override
michael@0:                     public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfo info) {}
michael@0:                 });
michael@0:         }
michael@0:     }
michael@0: 
michael@0:     void setCountWithAnimation(int count) {
michael@0:         // Don't animate from initial state
michael@0:         if (mCount == 0) {
michael@0:             setCount(count);
michael@0:             return;
michael@0:         }
michael@0: 
michael@0:         if (mCount == count) {
michael@0:             return;
michael@0:         }
michael@0: 
michael@0:         if (count < mCount) {
michael@0:             setInAnimation(mFlipInBackward);
michael@0:             setOutAnimation(mFlipOutForward);
michael@0:         } else {
michael@0:             setInAnimation(mFlipInForward);
michael@0:             setOutAnimation(mFlipOutBackward);
michael@0:         }
michael@0: 
michael@0:         // Eliminate screen artifact. Set explicit In/Out animation pair order. This will always
michael@0:         // animate pair in In->Out child order, prevent alternating use of the Out->In case.
michael@0:         setDisplayedChild(0);
michael@0: 
michael@0:         // Set In value, trigger animation to Out value
michael@0:         setCurrentText(String.valueOf(mCount));
michael@0:         setText(String.valueOf(count));
michael@0: 
michael@0:         mCount = count;
michael@0:     }
michael@0: 
michael@0:     void setCount(int count) {
michael@0:         setCurrentText(String.valueOf(count));
michael@0:         mCount = count;
michael@0:     }
michael@0: 
michael@0:     // Alpha animations in editing mode cause action bar corruption on the
michael@0:     // Nexus 7 (bug 961749). As a workaround, skip these animations in editing
michael@0:     // mode.
michael@0:     void onEnterEditingMode() {
michael@0:         final int childCount = getChildCount();
michael@0:         for (int i = 0; i < childCount; i++) {
michael@0:             getChildAt(i).clearAnimation();
michael@0:         }
michael@0:     }
michael@0: 
michael@0:     private AnimationSet createAnimation(float startAngle, float endAngle,
michael@0:                                          FadeMode fadeMode,
michael@0:                                          float zEnd, boolean reverse) {
michael@0:         final Context context = getContext();
michael@0:         AnimationSet set = new AnimationSet(context, null);
michael@0:         set.addAnimation(new Rotate3DAnimation(startAngle, endAngle, CENTER_X, CENTER_Y, zEnd, reverse));
michael@0:         set.addAnimation(fadeMode == FadeMode.FADE_IN ? new AlphaAnimation(0.0f, 1.0f) :
michael@0:                                                         new AlphaAnimation(1.0f, 0.0f));
michael@0:         set.setDuration(DURATION);
michael@0:         set.setInterpolator(context, android.R.anim.accelerate_interpolator);
michael@0:         return set;
michael@0:     }
michael@0: 
michael@0:     @Override
michael@0:     public View makeView() {
michael@0:         return mInflater.inflate(R.layout.tabs_counter, null);
michael@0:     }
michael@0: 
michael@0: }