1 /* 2 * Copyright (C) 2019 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.launcher3.graphics; 18 19 import static com.android.launcher3.icons.GraphicsUtils.setColorAlphaBound; 20 21 import android.graphics.Canvas; 22 import android.util.FloatProperty; 23 import android.view.View; 24 25 import com.android.launcher3.Launcher; 26 import com.android.launcher3.uioverrides.WallpaperColorInfo; 27 28 /** 29 * Contains general scrim properties such as wallpaper-extracted color that subclasses can use. 30 */ 31 public class Scrim implements View.OnAttachStateChangeListener, 32 WallpaperColorInfo.OnChangeListener { 33 34 public static final FloatProperty<Scrim> SCRIM_PROGRESS = 35 new FloatProperty<Scrim>("scrimProgress") { 36 @Override 37 public Float get(Scrim scrim) { 38 return scrim.mScrimProgress; 39 } 40 41 @Override 42 public void setValue(Scrim scrim, float v) { 43 scrim.setScrimProgress(v); 44 } 45 }; 46 47 protected final Launcher mLauncher; 48 protected final WallpaperColorInfo mWallpaperColorInfo; 49 protected final View mRoot; 50 51 protected float mScrimProgress; 52 protected int mScrimColor; 53 protected int mScrimAlpha = 0; 54 Scrim(View view)55 public Scrim(View view) { 56 mRoot = view; 57 mLauncher = Launcher.getLauncher(view.getContext()); 58 mWallpaperColorInfo = WallpaperColorInfo.INSTANCE.get(mLauncher); 59 60 view.addOnAttachStateChangeListener(this); 61 } 62 draw(Canvas canvas)63 public void draw(Canvas canvas) { 64 canvas.drawColor(setColorAlphaBound(mScrimColor, mScrimAlpha)); 65 } 66 setScrimProgress(float progress)67 private void setScrimProgress(float progress) { 68 if (mScrimProgress != progress) { 69 mScrimProgress = progress; 70 mScrimAlpha = Math.round(255 * mScrimProgress); 71 invalidate(); 72 } 73 } 74 75 @Override onViewAttachedToWindow(View view)76 public void onViewAttachedToWindow(View view) { 77 mWallpaperColorInfo.addOnChangeListener(this); 78 onExtractedColorsChanged(mWallpaperColorInfo); 79 } 80 81 @Override onViewDetachedFromWindow(View view)82 public void onViewDetachedFromWindow(View view) { 83 mWallpaperColorInfo.removeOnChangeListener(this); 84 } 85 86 @Override onExtractedColorsChanged(WallpaperColorInfo wallpaperColorInfo)87 public void onExtractedColorsChanged(WallpaperColorInfo wallpaperColorInfo) { 88 mScrimColor = wallpaperColorInfo.getMainColor(); 89 if (mScrimAlpha > 0) { 90 invalidate(); 91 } 92 } 93 invalidate()94 public void invalidate() { 95 mRoot.invalidate(); 96 } 97 } 98