1 /*
2  * Copyright (C) 2011 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.widget;
18 
19 import android.content.Context;
20 import android.graphics.Bitmap;
21 import android.graphics.Canvas;
22 import android.graphics.Paint;
23 import android.graphics.Rect;
24 import android.graphics.RectF;
25 import android.util.AttributeSet;
26 import android.view.View;
27 
28 /**
29  * View that draws a bitmap horizontally centered. If the image width is greater than the view
30  * width, the image is scaled down appropriately.
31  */
32 public class WidgetImageView extends View {
33 
34     private final Paint mPaint = new Paint(Paint.ANTI_ALIAS_FLAG | Paint.FILTER_BITMAP_FLAG);
35     private final RectF mDstRectF = new RectF();
36     private Bitmap mBitmap;
37 
WidgetImageView(Context context)38     public WidgetImageView(Context context) {
39         super(context);
40     }
41 
WidgetImageView(Context context, AttributeSet attrs)42     public WidgetImageView(Context context, AttributeSet attrs) {
43         super(context, attrs);
44     }
45 
WidgetImageView(Context context, AttributeSet attrs, int defStyle)46     public WidgetImageView(Context context, AttributeSet attrs, int defStyle) {
47         super(context, attrs, defStyle);
48     }
49 
setBitmap(Bitmap bitmap)50     public void setBitmap(Bitmap bitmap) {
51         mBitmap = bitmap;
52         invalidate();
53     }
54 
getBitmap()55     public Bitmap getBitmap() {
56         return mBitmap;
57     }
58 
59     @Override
onDraw(Canvas canvas)60     protected void onDraw(Canvas canvas) {
61         if (mBitmap != null) {
62             updateDstRectF();
63             canvas.drawBitmap(mBitmap, null, mDstRectF, mPaint);
64         }
65     }
66 
67     /**
68      * Prevents the inefficient alpha view rendering.
69      */
70     @Override
hasOverlappingRendering()71     public boolean hasOverlappingRendering() {
72         return false;
73     }
74 
updateDstRectF()75     private void updateDstRectF() {
76         if (mBitmap.getWidth() > getWidth()) {
77             float scale = ((float) getWidth()) / mBitmap.getWidth();
78             mDstRectF.set(0, 0, getWidth(), scale * mBitmap.getHeight());
79         } else {
80             mDstRectF.set(
81                     (getWidth() - mBitmap.getWidth()) * 0.5f,
82                     0,
83                     (getWidth() + mBitmap.getWidth()) * 0.5f,
84                     mBitmap.getHeight());
85         }
86     }
87 
88     /**
89      * @return the bounds where the image was drawn.
90      */
getBitmapBounds()91     public Rect getBitmapBounds() {
92         updateDstRectF();
93         Rect rect = new Rect();
94         mDstRectF.round(rect);
95         return rect;
96     }
97 }
98