1 /* 2 * Copyright (C) 2012 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.gallery3d.app; 17 18 import com.android.gallery3d.data.MediaObject; 19 import com.android.gallery3d.data.MediaObject.PanoramaSupportCallback; 20 import com.android.gallery3d.data.PanoramaMetadataJob; 21 import com.android.gallery3d.util.Future; 22 import com.android.gallery3d.util.FutureListener; 23 import com.android.gallery3d.util.LightCycleHelper; 24 import com.android.gallery3d.util.LightCycleHelper.PanoramaMetadata; 25 26 import java.util.ArrayList; 27 28 /** 29 * This class breaks out the off-thread panorama support checks so that the 30 * complexity can be shared between UriImage and LocalImage, which need to 31 * support panoramas. 32 */ 33 public class PanoramaMetadataSupport implements FutureListener<PanoramaMetadata> { 34 private Object mLock = new Object(); 35 private Future<PanoramaMetadata> mGetPanoMetadataTask; 36 private PanoramaMetadata mPanoramaMetadata; 37 private ArrayList<PanoramaSupportCallback> mCallbacksWaiting; 38 private MediaObject mMediaObject; 39 PanoramaMetadataSupport(MediaObject mediaObject)40 public PanoramaMetadataSupport(MediaObject mediaObject) { 41 mMediaObject = mediaObject; 42 } 43 getPanoramaSupport(GalleryApp app, PanoramaSupportCallback callback)44 public void getPanoramaSupport(GalleryApp app, PanoramaSupportCallback callback) { 45 synchronized (mLock) { 46 if (mPanoramaMetadata != null) { 47 callback.panoramaInfoAvailable(mMediaObject, mPanoramaMetadata.mUsePanoramaViewer, 48 mPanoramaMetadata.mIsPanorama360); 49 } else { 50 if (mCallbacksWaiting == null) { 51 mCallbacksWaiting = new ArrayList<PanoramaSupportCallback>(); 52 mGetPanoMetadataTask = app.getThreadPool().submit( 53 new PanoramaMetadataJob(app.getAndroidContext(), 54 mMediaObject.getContentUri()), this); 55 56 } 57 mCallbacksWaiting.add(callback); 58 } 59 } 60 } 61 clearCachedValues()62 public void clearCachedValues() { 63 synchronized (mLock) { 64 if (mPanoramaMetadata != null) { 65 mPanoramaMetadata = null; 66 } else if (mGetPanoMetadataTask != null) { 67 mGetPanoMetadataTask.cancel(); 68 for (PanoramaSupportCallback cb : mCallbacksWaiting) { 69 cb.panoramaInfoAvailable(mMediaObject, false, false); 70 } 71 mGetPanoMetadataTask = null; 72 mCallbacksWaiting = null; 73 } 74 } 75 } 76 77 @Override onFutureDone(Future<PanoramaMetadata> future)78 public void onFutureDone(Future<PanoramaMetadata> future) { 79 synchronized (mLock) { 80 mPanoramaMetadata = future.get(); 81 if (mPanoramaMetadata == null) { 82 // Error getting panorama data from file. Treat as not panorama. 83 mPanoramaMetadata = LightCycleHelper.NOT_PANORAMA; 84 } 85 for (PanoramaSupportCallback cb : mCallbacksWaiting) { 86 cb.panoramaInfoAvailable(mMediaObject, mPanoramaMetadata.mUsePanoramaViewer, 87 mPanoramaMetadata.mIsPanorama360); 88 } 89 mGetPanoMetadataTask = null; 90 mCallbacksWaiting = null; 91 } 92 } 93 } 94