1 /******************************************************************************* 2 * Copyright (C) 2012 Google Inc. 3 * Licensed to The Android Open Source Project. 4 * 5 * Licensed under the Apache License, Version 2.0 (the "License"); 6 * you may not use this file except in compliance with the License. 7 * You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 *******************************************************************************/ 17 18 package com.android.mail.ui; 19 20 import android.content.Context; 21 import android.graphics.Bitmap; 22 import android.graphics.Bitmap.Config; 23 import android.graphics.Canvas; 24 import android.util.AttributeSet; 25 import android.view.View; 26 27 import com.android.mail.utils.LogTag; 28 import com.android.mail.utils.LogUtils; 29 30 /** 31 * A normally inert view that draws a bitmap copy of the existing conversation list view when 32 * transitioning. 33 * 34 */ 35 public class ConversationListCopy extends View { 36 37 private Bitmap mBitmap; 38 39 private static final String LOG_TAG = LogTag.getLogTag(); 40 ConversationListCopy(Context c)41 public ConversationListCopy(Context c) { 42 this(c, null); 43 } 44 ConversationListCopy(Context c, AttributeSet attrs)45 public ConversationListCopy(Context c, AttributeSet attrs) { 46 super(c, attrs); 47 } 48 49 @Override onDraw(Canvas canvas)50 protected void onDraw(Canvas canvas) { 51 if (mBitmap == null) { 52 return; 53 } 54 canvas.drawBitmap(mBitmap, 0, 0, null); 55 } 56 57 /** 58 * Copy a bitmap of the source view. 59 * <p> 60 * Callers MUST call {@link #unbind()} when the copy is no longer needed. 61 * 62 * @param v 63 */ bind(View v)64 public void bind(View v) { 65 unbind(); 66 67 if (v.getWidth() == 0 || v.getHeight() == 0) { 68 return; 69 } 70 71 try { 72 mBitmap = Bitmap.createBitmap(v.getWidth(), v.getHeight(), Config.ARGB_8888); 73 v.draw(new Canvas(mBitmap)); 74 } catch (OutOfMemoryError e) { 75 LogUtils.e(LOG_TAG, e, "Unable to create fancy list transition bitmap"); 76 // mBitmap will just be null, and this won't draw, which is fine 77 } 78 } 79 80 /** 81 * Release resources from a previous {@link #bind(View)}. 82 */ unbind()83 public void unbind() { 84 if (mBitmap != null) { 85 mBitmap.recycle(); 86 mBitmap = null; 87 } 88 } 89 90 } 91