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      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 
     38     public WidgetImageView(Context context) {
     39         super(context);
     40     }
     41 
     42     public WidgetImageView(Context context, AttributeSet attrs) {
     43         super(context, attrs);
     44     }
     45 
     46     public WidgetImageView(Context context, AttributeSet attrs, int defStyle) {
     47         super(context, attrs, defStyle);
     48     }
     49 
     50     public void setBitmap(Bitmap bitmap) {
     51         mBitmap = bitmap;
     52         invalidate();
     53     }
     54 
     55     public Bitmap getBitmap() {
     56         return mBitmap;
     57     }
     58 
     59     @Override
     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
     71     public boolean hasOverlappingRendering() {
     72         return false;
     73     }
     74 
     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      */
     91     public Rect getBitmapBounds() {
     92         updateDstRectF();
     93         Rect rect = new Rect();
     94         mDstRectF.round(rect);
     95         return rect;
     96     }
     97 }
     98