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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 package com.android.contacts.detail;
     17 
     18 import android.content.Context;
     19 import android.graphics.Canvas;
     20 import android.graphics.Matrix;
     21 import android.util.AttributeSet;
     22 import android.widget.ImageView;
     23 
     24 /**
     25  * Extension to ImageView that handles cropping during resize animations.
     26  */
     27 public class TransformableImageView extends ImageView {
     28 
     29     public TransformableImageView(Context context) {
     30         super(context);
     31     }
     32 
     33     public TransformableImageView(Context context, AttributeSet attrs) {
     34         super(context, attrs);
     35     }
     36 
     37     public TransformableImageView(Context context, AttributeSet attrs, int defStyle) {
     38         super(context, attrs, defStyle);
     39     }
     40 
     41     @Override
     42     protected void onDraw(Canvas canvas) {
     43         if (getDrawable() == null) {
     44             return;
     45         }
     46         int saveCount = canvas.getSaveCount();
     47         canvas.save();
     48         canvas.translate(mPaddingLeft, mPaddingTop);
     49         Matrix drawMatrix = new Matrix();
     50         int dwidth = getDrawable().getIntrinsicWidth();
     51         int dheight = getDrawable().getIntrinsicHeight();
     52 
     53         int vwidth = getWidth() - mPaddingLeft - mPaddingRight;
     54         int vheight = getHeight() - mPaddingTop - mPaddingBottom;
     55         float scale;
     56         float dx = 0, dy = 0;
     57 
     58         if (dwidth * vheight > vwidth * dheight) {
     59             scale = (float) vheight / (float) dheight;
     60             dx = (vwidth - dwidth * scale) * 0.5f;
     61         } else {
     62             scale = (float) vwidth / (float) dwidth;
     63             dy = (vheight - dheight * scale) * 0.5f;
     64         }
     65 
     66         drawMatrix.setScale(scale, scale);
     67         drawMatrix.postTranslate((int) (dx + 0.5f), (int) (dy + 0.5f));
     68         canvas.concat(drawMatrix);
     69         getDrawable().draw(canvas);
     70         canvas.restoreToCount(saveCount);
     71     }
     72 }
     73