1 /* 2 * Copyright (C) 2014 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.systemui.statusbar; 18 19 import android.content.Context; 20 import android.content.res.TypedArray; 21 import android.util.AttributeSet; 22 import android.widget.ImageView; 23 24 import com.android.systemui.R; 25 26 /** 27 * An ImageView which supports an attribute specifying whether it has overlapping rendering 28 * commands and therefore does not need a layer when alpha is changed. 29 */ 30 public class AlphaOptimizedImageView extends ImageView { 31 private final boolean mHasOverlappingRendering; 32 33 public AlphaOptimizedImageView(Context context) { 34 this(context, null /* attrs */); 35 } 36 37 public AlphaOptimizedImageView(Context context, AttributeSet attrs) { 38 this(context, attrs, 0 /* defStyleAttr */); 39 } 40 41 public AlphaOptimizedImageView(Context context, AttributeSet attrs, int defStyleAttr) { 42 this(context, attrs, defStyleAttr, 0 /* defStyleRes */); 43 } 44 45 public AlphaOptimizedImageView(Context context, AttributeSet attrs, int defStyleAttr, 46 int defStyleRes) { 47 super(context, attrs, defStyleAttr, defStyleRes); 48 49 TypedArray a = context.getTheme().obtainStyledAttributes(attrs, 50 R.styleable.AlphaOptimizedImageView, 0, 0); 51 52 try { 53 // Default to true, which is what View.java defaults to 54 mHasOverlappingRendering = a.getBoolean( 55 R.styleable.AlphaOptimizedImageView_hasOverlappingRendering, true); 56 } finally { 57 a.recycle(); 58 } 59 } 60 61 @Override 62 public boolean hasOverlappingRendering() { 63 return mHasOverlappingRendering; 64 } 65 } 66
