| /* |
| * Copyright (C) 2016 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.android.documentsui; |
| |
| import android.app.Activity; |
| import android.content.BroadcastReceiver; |
| import android.content.Context; |
| import android.content.Intent; |
| import android.content.IntentFilter; |
| import android.net.Uri; |
| import android.support.v4.content.LocalBroadcastManager; |
| |
| import com.android.documentsui.AbstractActionHandler.CommonAddons; |
| import com.android.documentsui.base.DocumentInfo; |
| import com.android.documentsui.base.PairedTask; |
| import com.android.documentsui.base.RootInfo; |
| import com.android.documentsui.base.State; |
| import com.android.documentsui.dirlist.AnimationView; |
| import com.android.documentsui.queries.SearchViewManager; |
| import com.android.documentsui.roots.ProvidersAccess; |
| |
| import java.util.Collection; |
| |
| /** |
| * Monitors roots change and refresh the page when necessary. |
| */ |
| final class RootsMonitor<T extends Activity & CommonAddons> { |
| |
| private final LocalBroadcastManager mManager; |
| private final BroadcastReceiver mReceiver; |
| |
| RootsMonitor( |
| final T activity, |
| final ActionHandler actions, |
| final ProvidersAccess providers, |
| final DocumentsAccess docs, |
| final State state, |
| final SearchViewManager searchMgr, |
| final Runnable actionModeFinisher) { |
| mManager = LocalBroadcastManager.getInstance(activity); |
| |
| mReceiver = new BroadcastReceiver() { |
| @Override |
| public void onReceive(Context context, Intent intent) { |
| new HandleRootsChangedTask<>( |
| activity, |
| actions, |
| providers, |
| docs, |
| state, |
| searchMgr, |
| actionModeFinisher).execute(activity.getCurrentRoot()); |
| } |
| }; |
| } |
| |
| void start() { |
| mManager.registerReceiver(mReceiver, new IntentFilter(ProvidersAccess.BROADCAST_ACTION)); |
| } |
| |
| void stop() { |
| mManager.unregisterReceiver(mReceiver); |
| } |
| |
| private static class HandleRootsChangedTask<T extends Activity & CommonAddons> |
| extends PairedTask<T, RootInfo, RootInfo> { |
| private final ActionHandler mActions; |
| private final ProvidersAccess mProviders; |
| private final DocumentsAccess mDocs; |
| private final State mState; |
| private final SearchViewManager mSearchMgr; |
| private final Runnable mActionModeFinisher; |
| |
| private RootInfo mCurrentRoot; |
| private DocumentInfo mDefaultRootDocument; |
| |
| private HandleRootsChangedTask( |
| T activity, |
| ActionHandler actions, |
| ProvidersAccess providers, |
| DocumentsAccess docs, |
| State state, |
| SearchViewManager searchMgr, |
| Runnable actionModeFinisher) { |
| super(activity); |
| mActions = actions; |
| mProviders = providers; |
| mDocs = docs; |
| mState = state; |
| mSearchMgr = searchMgr; |
| mActionModeFinisher = actionModeFinisher; |
| } |
| |
| @Override |
| protected RootInfo run(RootInfo... roots) { |
| assert (roots.length == 1); |
| mCurrentRoot = roots[0]; |
| final Collection<RootInfo> cachedRoots = mProviders.getRootsBlocking(); |
| for (final RootInfo root : cachedRoots) { |
| if (root.getUri().equals(mCurrentRoot.getUri())) { |
| // We don't need to change the current root as the current root was not removed. |
| return null; |
| } |
| } |
| |
| // Choose the default root. |
| final RootInfo defaultRoot = mProviders.getDefaultRootBlocking(mState); |
| assert (defaultRoot != null); |
| if (!defaultRoot.isRecents()) { |
| mDefaultRootDocument = mDocs.getRootDocument(defaultRoot); |
| } |
| return defaultRoot; |
| } |
| |
| @Override |
| protected void finish(RootInfo defaultRoot) { |
| if (defaultRoot == null) { |
| return; |
| } |
| |
| // If the activity has been launched for the specific root and it is removed, finish the |
| // activity. |
| final Uri uri = mOwner.getIntent().getData(); |
| if (uri != null && uri.equals(mCurrentRoot.getUri())) { |
| mOwner.finish(); |
| return; |
| } |
| |
| // Clean action mode before changing root. |
| mActionModeFinisher.run(); |
| |
| // Clear entire backstack and start in new root. |
| mState.stack.changeRoot(defaultRoot); |
| mSearchMgr.update(mState.stack); |
| |
| if (defaultRoot.isRecents()) { |
| mOwner.refreshCurrentRootAndDirectory(AnimationView.ANIM_NONE); |
| } else { |
| mActions.openContainerDocument(mDefaultRootDocument); |
| } |
| } |
| } |
| } |