121 lines
3.5 KiB
Java
121 lines
3.5 KiB
Java
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/*
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* Copyright (C) 2013 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package android.graphics.drawable;
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import android.animation.ObjectAnimator;
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import android.animation.TimeInterpolator;
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import android.graphics.Canvas;
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import android.graphics.Paint;
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import android.graphics.Rect;
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import android.util.FloatProperty;
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import android.view.animation.LinearInterpolator;
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/**
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* Draws a ripple background.
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*/
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class RippleBackground extends RippleComponent {
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private static final TimeInterpolator LINEAR_INTERPOLATOR = new LinearInterpolator();
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private static final int OPACITY_DURATION = 80;
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private ObjectAnimator mAnimator;
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private float mOpacity = 0;
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/** Whether this ripple is bounded. */
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private boolean mIsBounded;
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private boolean mFocused = false;
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private boolean mHovered = false;
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public RippleBackground(RippleDrawable owner, Rect bounds, boolean isBounded) {
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super(owner, bounds);
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mIsBounded = isBounded;
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}
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public boolean isVisible() {
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return mOpacity > 0;
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}
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public void draw(Canvas c, Paint p) {
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final int origAlpha = p.getAlpha();
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final int alpha = Math.min((int) (origAlpha * mOpacity + 0.5f), 255);
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if (alpha > 0) {
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p.setAlpha(alpha);
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c.drawCircle(0, 0, mTargetRadius, p);
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p.setAlpha(origAlpha);
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}
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}
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public void setState(boolean focused, boolean hovered, boolean pressed) {
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if (!mFocused) {
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focused = focused && !pressed;
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}
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if (!mHovered) {
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hovered = hovered && !pressed;
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}
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if (mHovered != hovered || mFocused != focused) {
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mHovered = hovered;
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mFocused = focused;
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onStateChanged();
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}
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}
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private void onStateChanged() {
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// Hover = .2 * alpha
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// Focus = .6 * alpha
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// Focused + Hovered = .6 * alpha
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float newOpacity = mFocused ? .6f : mHovered ? .2f : 0f;
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if (mAnimator != null) {
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mAnimator.cancel();
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mAnimator = null;
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}
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mAnimator = ObjectAnimator.ofFloat(this, OPACITY, newOpacity);
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mAnimator.setDuration(OPACITY_DURATION);
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mAnimator.setInterpolator(LINEAR_INTERPOLATOR);
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mAnimator.start();
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}
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public void jumpToFinal() {
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if (mAnimator != null) {
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mAnimator.end();
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mAnimator = null;
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}
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}
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private static abstract class BackgroundProperty extends FloatProperty<RippleBackground> {
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public BackgroundProperty(String name) {
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super(name);
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}
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}
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private static final BackgroundProperty OPACITY = new BackgroundProperty("opacity") {
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@Override
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public void setValue(RippleBackground object, float value) {
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object.mOpacity = value;
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object.invalidateSelf();
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}
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@Override
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public Float get(RippleBackground object) {
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return object.mOpacity;
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}
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};
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}
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