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.recents.views;
18 
19 import android.content.Context;
20 import android.graphics.drawable.BitmapDrawable;
21 import android.graphics.drawable.Drawable;
22 import android.util.AttributeSet;
23 
24 import com.android.systemui.statusbar.AlphaOptimizedImageView;
25 
26 /**
27  * This is an optimized ImageView that does not trigger a <code>requestLayout()</code> or
28  * <code>invalidate()</code> when setting the image to <code>null</code>.
29  */
30 public class FixedSizeImageView extends AlphaOptimizedImageView {
31 
32     private boolean mAllowRelayout = true;
33     private boolean mAllowInvalidate = true;
34 
FixedSizeImageView(Context context)35     public FixedSizeImageView(Context context) {
36         this(context, null);
37     }
38 
FixedSizeImageView(Context context, AttributeSet attrs)39     public FixedSizeImageView(Context context, AttributeSet attrs) {
40         this(context, attrs, 0);
41     }
42 
FixedSizeImageView(Context context, AttributeSet attrs, int defStyleAttr)43     public FixedSizeImageView(Context context, AttributeSet attrs, int defStyleAttr) {
44         this(context, attrs, defStyleAttr, 0);
45     }
46 
FixedSizeImageView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes)47     public FixedSizeImageView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
48         super(context, attrs, defStyleAttr, defStyleRes);
49     }
50 
51     @Override
requestLayout()52     public void requestLayout() {
53         if (mAllowRelayout) {
54             super.requestLayout();
55         }
56     }
57 
58     @Override
invalidate()59     public void invalidate() {
60         if (mAllowInvalidate) {
61             super.invalidate();
62         }
63     }
64 
65     @Override
setImageDrawable(Drawable drawable)66     public void setImageDrawable(Drawable drawable) {
67         boolean isNullBitmapDrawable = (drawable instanceof BitmapDrawable) &&
68                 (((BitmapDrawable) drawable).getBitmap() == null);
69         if (drawable == null || isNullBitmapDrawable) {
70             mAllowRelayout = false;
71             mAllowInvalidate = false;
72         }
73         super.setImageDrawable(drawable);
74         mAllowRelayout = true;
75         mAllowInvalidate = true;
76     }
77 }
78