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