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/*
* Copyright (C) 2013 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 android.graphics.drawable;
import android.animation.Animator;
import android.animation.AnimatorSet;
import android.animation.ObjectAnimator;
import android.animation.TimeInterpolator;
import android.graphics.Canvas;
import android.graphics.CanvasProperty;
import android.graphics.Paint;
import android.graphics.Rect;
import android.util.FloatProperty;
import android.view.DisplayListCanvas;
import android.view.RenderNodeAnimator;
import android.view.animation.LinearInterpolator;
/**
* Draws a ripple background.
*/
class RippleBackground extends RippleComponent {
private static final TimeInterpolator LINEAR_INTERPOLATOR = new LinearInterpolator();
private static final int OPACITY_ENTER_DURATION = 600;
private static final int OPACITY_ENTER_DURATION_FAST = 120;
private static final int OPACITY_EXIT_DURATION = 480;
// Hardware rendering properties.
private CanvasProperty<Paint> mPropPaint;
private CanvasProperty<Float> mPropRadius;
private CanvasProperty<Float> mPropX;
private CanvasProperty<Float> mPropY;
// Software rendering properties.
private float mOpacity = 0;
public RippleBackground(RippleDrawable owner, Rect bounds) {
super(owner, bounds);
}
public boolean isVisible() {
return mOpacity > 0 || isHardwareAnimating();
}
@Override
protected boolean drawSoftware(Canvas c, Paint p) {
boolean hasContent = false;
final int origAlpha = p.getAlpha();
final int alpha = (int) (origAlpha * mOpacity + 0.5f);
if (alpha > 0) {
p.setAlpha(alpha);
c.drawCircle(0, 0, mTargetRadius, p);
p.setAlpha(origAlpha);
hasContent = true;
}
return hasContent;
}
@Override
protected boolean drawHardware(DisplayListCanvas c) {
c.drawCircle(mPropX, mPropY, mPropRadius, mPropPaint);
return true;
}
@Override
protected Animator createSoftwareEnter(boolean fast) {
// Linear enter based on current opacity.
final int maxDuration = fast ? OPACITY_ENTER_DURATION_FAST : OPACITY_ENTER_DURATION;
final int duration = (int) ((1 - mOpacity) * maxDuration);
final ObjectAnimator opacity = ObjectAnimator.ofFloat(this, OPACITY, 1);
opacity.setAutoCancel(true);
opacity.setDuration(duration);
opacity.setInterpolator(LINEAR_INTERPOLATOR);
return opacity;
}
@Override
protected Animator createSoftwareExit() {
final AnimatorSet set = new AnimatorSet();
// Linear exit after enter is completed.
final ObjectAnimator exit = ObjectAnimator.ofFloat(this, RippleBackground.OPACITY, 0);
exit.setInterpolator(LINEAR_INTERPOLATOR);
exit.setDuration(OPACITY_EXIT_DURATION);
exit.setAutoCancel(true);
final AnimatorSet.Builder builder = set.play(exit);
// Linear "fast" enter based on current opacity.
final int fastEnterDuration = (int) ((1 - mOpacity) * OPACITY_ENTER_DURATION_FAST);
if (fastEnterDuration > 0) {
final ObjectAnimator enter = ObjectAnimator.ofFloat(this, RippleBackground.OPACITY, 1);
enter.setInterpolator(LINEAR_INTERPOLATOR);
enter.setDuration(fastEnterDuration);
enter.setAutoCancel(true);
builder.after(enter);
}
return set;
}
@Override
protected RenderNodeAnimatorSet createHardwareExit(Paint p) {
final RenderNodeAnimatorSet set = new RenderNodeAnimatorSet();
final int targetAlpha = p.getAlpha();
final int currentAlpha = (int) (mOpacity * targetAlpha + 0.5f);
p.setAlpha(currentAlpha);
mPropPaint = CanvasProperty.createPaint(p);
mPropRadius = CanvasProperty.createFloat(mTargetRadius);
mPropX = CanvasProperty.createFloat(0);
mPropY = CanvasProperty.createFloat(0);
// Linear "fast" enter based on current opacity.
final int fastEnterDuration = (int) ((1 - mOpacity) * OPACITY_ENTER_DURATION_FAST);
if (fastEnterDuration > 0) {
final RenderNodeAnimator enter = new RenderNodeAnimator(
mPropPaint, RenderNodeAnimator.PAINT_ALPHA, targetAlpha);
enter.setInterpolator(LINEAR_INTERPOLATOR);
enter.setDuration(fastEnterDuration);
set.add(enter);
}
// Linear exit after enter is completed.
final RenderNodeAnimator exit = new RenderNodeAnimator(
mPropPaint, RenderNodeAnimator.PAINT_ALPHA, 0);
exit.setInterpolator(LINEAR_INTERPOLATOR);
exit.setDuration(OPACITY_EXIT_DURATION);
exit.setStartDelay(fastEnterDuration);
set.add(exit);
return set;
}
@Override
protected void jumpValuesToExit() {
mOpacity = 0;
}
private static abstract class BackgroundProperty extends FloatProperty<RippleBackground> {
public BackgroundProperty(String name) {
super(name);
}
}
private static final BackgroundProperty OPACITY = new BackgroundProperty("opacity") {
@Override
public void setValue(RippleBackground object, float value) {
object.mOpacity = value;
object.invalidateSelf();
}
@Override
public Float get(RippleBackground object) {
return object.mOpacity;
}
};
}
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