| /* |
| * 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.graphics.Rect; |
| import android.util.DisplayMetrics; |
| |
| /** |
| * 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. |
| } |
| } |