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/*
* Copyright (C) 2012 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.launcher3;
import android.animation.Animator;
import android.animation.AnimatorSet;
import android.animation.ObjectAnimator;
import android.animation.PropertyValuesHolder;
import android.animation.ValueAnimator;
import android.graphics.drawable.Drawable;
import android.util.Property;
import android.view.View;
import android.view.ViewTreeObserver;
import java.util.HashSet;
import java.util.WeakHashMap;
public class LauncherAnimUtils {
/**
* Durations for various state animations. These are not defined in resources to allow
* easier access from static classes and enums
*/
public static final int ALL_APPS_TRANSITION_MS = 320;
public static final int OVERVIEW_TRANSITION_MS = 250;
public static final int SPRING_LOADED_TRANSITION_MS = 150;
public static final int SPRING_LOADED_EXIT_DELAY = 500;
// The progress of an animation to all apps must be at least this far along to snap to all apps.
public static final float MIN_PROGRESS_TO_ALL_APPS = 0.5f;
static WeakHashMap<Animator, Object> sAnimators = new WeakHashMap<Animator, Object>();
static Animator.AnimatorListener sEndAnimListener = new Animator.AnimatorListener() {
public void onAnimationStart(Animator animation) {
sAnimators.put(animation, null);
}
public void onAnimationRepeat(Animator animation) {
}
public void onAnimationEnd(Animator animation) {
sAnimators.remove(animation);
}
public void onAnimationCancel(Animator animation) {
sAnimators.remove(animation);
}
};
public static void cancelOnDestroyActivity(Animator a) {
a.addListener(sEndAnimListener);
}
// Helper method. Assumes a draw is pending, and that if the animation's duration is 0
// it should be cancelled
public static void startAnimationAfterNextDraw(final Animator animator, final View view) {
view.getViewTreeObserver().addOnDrawListener(new ViewTreeObserver.OnDrawListener() {
private boolean mStarted = false;
public void onDraw() {
if (mStarted) return;
mStarted = true;
// Use this as a signal that the animation was cancelled
if (animator.getDuration() == 0) {
return;
}
animator.start();
final ViewTreeObserver.OnDrawListener listener = this;
view.post(new Runnable() {
public void run() {
view.getViewTreeObserver().removeOnDrawListener(listener);
}
});
}
});
}
public static void onDestroyActivity() {
HashSet<Animator> animators = new HashSet<Animator>(sAnimators.keySet());
for (Animator a : animators) {
if (a.isRunning()) {
a.cancel();
}
sAnimators.remove(a);
}
}
public static AnimatorSet createAnimatorSet() {
AnimatorSet anim = new AnimatorSet();
cancelOnDestroyActivity(anim);
return anim;
}
public static ValueAnimator ofFloat(float... values) {
ValueAnimator anim = new ValueAnimator();
anim.setFloatValues(values);
cancelOnDestroyActivity(anim);
return anim;
}
public static ObjectAnimator ofFloat(View target, Property<View, Float> property,
float... values) {
ObjectAnimator anim = ObjectAnimator.ofFloat(target, property, values);
cancelOnDestroyActivity(anim);
new FirstFrameAnimatorHelper(anim, target);
return anim;
}
public static ObjectAnimator ofViewAlphaAndScale(View target,
float alpha, float scaleX, float scaleY) {
return ofPropertyValuesHolder(target,
PropertyValuesHolder.ofFloat(View.ALPHA, alpha),
PropertyValuesHolder.ofFloat(View.SCALE_X, scaleX),
PropertyValuesHolder.ofFloat(View.SCALE_Y, scaleY));
}
public static ObjectAnimator ofPropertyValuesHolder(View target,
PropertyValuesHolder... values) {
return ofPropertyValuesHolder(target, target, values);
}
public static ObjectAnimator ofPropertyValuesHolder(Object target,
View view, PropertyValuesHolder... values) {
ObjectAnimator anim = ObjectAnimator.ofPropertyValuesHolder(target, values);
cancelOnDestroyActivity(anim);
new FirstFrameAnimatorHelper(anim, view);
return anim;
}
public static final Property<Drawable, Integer> DRAWABLE_ALPHA =
new Property<Drawable, Integer>(Integer.TYPE, "drawableAlpha") {
@Override
public Integer get(Drawable drawable) {
return drawable.getAlpha();
}
@Override
public void set(Drawable drawable, Integer alpha) {
drawable.setAlpha(alpha);
}
};
public static final Property<View, Float> SCALE_PROPERTY =
new Property<View, Float>(Float.class, "scale") {
@Override
public Float get(View view) {
return view.getScaleX();
}
@Override
public void set(View view, Float scale) {
view.setScaleX(scale);
view.setScaleY(scale);
}
};
/** Increase the duration if we prevented the fling, as we are going against a high velocity. */
public static int blockedFlingDurationFactor(float velocity) {
return (int) Utilities.boundToRange(Math.abs(velocity) / 2, 2f, 6f);
}
}
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