1 /* 2 * Copyright (C) 2016 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.documentsui; 18 19 import android.app.Activity; 20 import android.content.BroadcastReceiver; 21 import android.content.Context; 22 import android.content.Intent; 23 import android.content.IntentFilter; 24 import android.net.Uri; 25 import android.support.v4.content.LocalBroadcastManager; 26 27 import com.android.documentsui.AbstractActionHandler.CommonAddons; 28 import com.android.documentsui.base.DocumentInfo; 29 import com.android.documentsui.base.PairedTask; 30 import com.android.documentsui.base.RootInfo; 31 import com.android.documentsui.base.State; 32 import com.android.documentsui.dirlist.AnimationView; 33 import com.android.documentsui.queries.SearchViewManager; 34 import com.android.documentsui.roots.ProvidersAccess; 35 import com.android.documentsui.selection.SelectionManager; 36 37 import java.util.Collection; 38 39 /** 40 * Monitors roots change and refresh the page when necessary. 41 */ 42 final class RootsMonitor<T extends Activity & CommonAddons> { 43 44 private final LocalBroadcastManager mManager; 45 private final BroadcastReceiver mReceiver; 46 47 RootsMonitor( 48 final T activity, 49 final ActionHandler actions, 50 final ProvidersAccess providers, 51 final DocumentsAccess docs, 52 final State state, 53 final SearchViewManager searchMgr, 54 final Runnable actionModeFinisher) { 55 mManager = LocalBroadcastManager.getInstance(activity); 56 57 mReceiver = new BroadcastReceiver() { 58 @Override 59 public void onReceive(Context context, Intent intent) { 60 new HandleRootsChangedTask<T>( 61 activity, 62 actions, 63 providers, 64 docs, 65 state, 66 searchMgr, 67 actionModeFinisher).execute(activity.getCurrentRoot()); 68 } 69 }; 70 } 71 72 void start() { 73 mManager.registerReceiver(mReceiver, new IntentFilter(ProvidersAccess.BROADCAST_ACTION)); 74 } 75 76 void stop() { 77 mManager.unregisterReceiver(mReceiver); 78 } 79 80 private static class HandleRootsChangedTask<T extends Activity & CommonAddons> 81 extends PairedTask<T, RootInfo, RootInfo> { 82 private final ActionHandler mActions; 83 private final ProvidersAccess mProviders; 84 private final DocumentsAccess mDocs; 85 private final State mState; 86 private final SearchViewManager mSearchMgr; 87 private final Runnable mActionModeFinisher; 88 89 private RootInfo mCurrentRoot; 90 private DocumentInfo mDefaultRootDocument; 91 92 private HandleRootsChangedTask( 93 T activity, 94 ActionHandler actions, 95 ProvidersAccess providers, 96 DocumentsAccess docs, 97 State state, 98 SearchViewManager searchMgr, 99 Runnable actionModeFinisher) { 100 super(activity); 101 mActions = actions; 102 mProviders = providers; 103 mDocs = docs; 104 mState = state; 105 mSearchMgr = searchMgr; 106 mActionModeFinisher = actionModeFinisher; 107 } 108 109 @Override 110 protected RootInfo run(RootInfo... roots) { 111 assert (roots.length == 1); 112 mCurrentRoot = roots[0]; 113 final Collection<RootInfo> cachedRoots = mProviders.getRootsBlocking(); 114 for (final RootInfo root : cachedRoots) { 115 if (root.getUri().equals(mCurrentRoot.getUri())) { 116 // We don't need to change the current root as the current root was not removed. 117 return null; 118 } 119 } 120 121 // Choose the default root. 122 final RootInfo defaultRoot = mProviders.getDefaultRootBlocking(mState); 123 assert (defaultRoot != null); 124 if (!defaultRoot.isRecents()) { 125 mDefaultRootDocument = mDocs.getRootDocument(defaultRoot); 126 } 127 return defaultRoot; 128 } 129 130 @Override 131 protected void finish(RootInfo defaultRoot) { 132 if (defaultRoot == null) { 133 return; 134 } 135 136 // If the activity has been launched for the specific root and it is removed, finish the 137 // activity. 138 final Uri uri = mOwner.getIntent().getData(); 139 if (uri != null && uri.equals(mCurrentRoot.getUri())) { 140 mOwner.finish(); 141 return; 142 } 143 144 // Clean action mode before changing root. 145 mActionModeFinisher.run(); 146 147 // Clear entire backstack and start in new root. 148 mState.stack.changeRoot(defaultRoot); 149 mSearchMgr.update(mState.stack); 150 151 if (defaultRoot.isRecents()) { 152 mOwner.refreshCurrentRootAndDirectory(AnimationView.ANIM_NONE); 153 } else { 154 mActions.openContainerDocument(mDefaultRootDocument); 155 } 156 } 157 } 158 } 159