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/*
* Copyright (C) 2015 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.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Rect;
import android.util.DisplayMetrics;
import android.view.DisplayListCanvas;
import android.view.RenderNodeAnimator;
import java.util.ArrayList;
/**
* Abstract class that handles size & positioning common to the ripple & focus states.
*/
abstract class RippleComponent {
protected final RippleDrawable mOwner;
/** Bounds used for computing max radius. May be modified by the owner. */
protected final Rect mBounds;
/** Whether we have an explicit maximum radius. */
private boolean mHasMaxRadius;
/** How big this ripple should be when fully entered. */
protected float mTargetRadius;
/** Screen density used to adjust pixel-based constants. */
protected float mDensityScale;
public RippleComponent(RippleDrawable owner, Rect bounds) {
mOwner = owner;
mBounds = bounds;
}
public void onBoundsChange() {
if (!mHasMaxRadius) {
mTargetRadius = getTargetRadius(mBounds);
onTargetRadiusChanged(mTargetRadius);
}
}
public final void setup(float maxRadius, int densityDpi) {
if (maxRadius >= 0) {
mHasMaxRadius = true;
mTargetRadius = maxRadius;
} else {
mTargetRadius = getTargetRadius(mBounds);
}
mDensityScale = densityDpi * DisplayMetrics.DENSITY_DEFAULT_SCALE;
onTargetRadiusChanged(mTargetRadius);
}
private static float getTargetRadius(Rect bounds) {
final float halfWidth = bounds.width() / 2.0f;
final float halfHeight = bounds.height() / 2.0f;
return (float) Math.sqrt(halfWidth * halfWidth + halfHeight * halfHeight);
}
/**
* Populates {@code bounds} with the maximum drawing bounds of the ripple
* relative to its center. The resulting bounds should be translated into
* parent drawable coordinates before use.
*
* @param bounds the rect to populate with drawing bounds
*/
public void getBounds(Rect bounds) {
final int r = (int) Math.ceil(mTargetRadius);
bounds.set(-r, -r, r, r);
}
protected final void invalidateSelf() {
mOwner.invalidateSelf(false);
}
protected final void onHotspotBoundsChanged() {
if (!mHasMaxRadius) {
mTargetRadius = getTargetRadius(mBounds);
onTargetRadiusChanged(mTargetRadius);
}
}
/**
* Called when the target radius changes.
*
* @param targetRadius the new target radius
*/
protected void onTargetRadiusChanged(float targetRadius) {
// Stub.
}
}
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