1 files changed, 154 insertions, 0 deletions
diff --git a/mobile/android/base/java/org/mozilla/gecko/toolbar/TabCounter.java b/mobile/android/base/java/org/mozilla/gecko/toolbar/TabCounter.java
new file mode 100644
index 000000000..1e0ca516b
--- /dev/null
+++ b/mobile/android/base/java/org/mozilla/gecko/toolbar/TabCounter.java
@@ -0,0 +1,154 @@
+/* -*- 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.AppConstants.Versions;
+import org.mozilla.gecko.R;
+import org.mozilla.gecko.animation.Rotate3DAnimation;
+import org.mozilla.gecko.widget.themed.ThemedTextSwitcher;
+
+import android.content.Context;
+import android.content.res.TypedArray;
+import android.util.AttributeSet;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.accessibility.AccessibilityNodeInfo;
+import android.view.animation.AlphaAnimation;
+import android.view.animation.AnimationSet;
+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 final int mLayoutId;
+
+    private int mCount;
+    public static final int MAX_VISIBLE_TABS = 99;
+    public static final String SO_MANY_TABS_OPEN = "∞";
+
+    private enum FadeMode {
+        FADE_IN,
+        FADE_OUT
+    }
+
+    public TabCounter(Context context, AttributeSet attrs) {
+        super(context, attrs);
+
+        final TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.TabCounter);
+        mLayoutId = a.getResourceId(R.styleable.TabCounter_android_layout, R.layout.tabs_counter);
+        a.recycle();
+
+        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 (Versions.feature16Plus) {
+            // 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;
+        }
+
+        // don't animate if there are still over MAX_VISIBLE_TABS tabs open
+        if (mCount > MAX_VISIBLE_TABS && count > MAX_VISIBLE_TABS) {
+            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(formatForDisplay(mCount));
+        setText(formatForDisplay(count));
+
+        mCount = count;
+    }
+
+    private String formatForDisplay(int count) {
+        if (count > MAX_VISIBLE_TABS) {
+            return SO_MANY_TABS_OPEN;
+        }
+        return String.valueOf(count);
+    }
+
+    void setCount(int count) {
+        setCurrentText(formatForDisplay(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(mLayoutId, null);
+    }
+
+}