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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.ObjectAnimator;
import android.animation.TimeInterpolator;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Rect;
import android.util.FloatProperty;
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_DURATION = 80;
private ObjectAnimator mAnimator;
private float mOpacity = 0;
/** Whether this ripple is bounded. */
private boolean mIsBounded;
private boolean mFocused = false;
private boolean mHovered = false;
public RippleBackground(RippleDrawable owner, Rect bounds, boolean isBounded) {
super(owner, bounds);
mIsBounded = isBounded;
}
public boolean isVisible() {
return mOpacity > 0;
}
public void draw(Canvas c, Paint p) {
final int origAlpha = p.getAlpha();
final int alpha = Math.min((int) (origAlpha * mOpacity + 0.5f), 255);
if (alpha > 0) {
p.setAlpha(alpha);
c.drawCircle(0, 0, mTargetRadius, p);
p.setAlpha(origAlpha);
}
}
public void setState(boolean focused, boolean hovered, boolean pressed) {
if (!mFocused) {
focused = focused && !pressed;
}
if (!mHovered) {
hovered = hovered && !pressed;
}
if (mHovered != hovered || mFocused != focused) {
mHovered = hovered;
mFocused = focused;
onStateChanged();
}
}
private void onStateChanged() {
float newOpacity = 0.0f;
if (mHovered) newOpacity += .25f;
if (mFocused) newOpacity += .75f;
if (mAnimator != null) {
mAnimator.cancel();
mAnimator = null;
}
mAnimator = ObjectAnimator.ofFloat(this, OPACITY, newOpacity);
mAnimator.setDuration(OPACITY_DURATION);
mAnimator.setInterpolator(LINEAR_INTERPOLATOR);
mAnimator.start();
}
public void jumpToFinal() {
if (mAnimator != null) {
mAnimator.end();
mAnimator = null;
}
}
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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