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/* -*- 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);
}
}
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