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      1 /*
      2  * Copyright (C) 2014 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.systemui.recents;
     18 
     19 import android.appwidget.AppWidgetHost;
     20 import android.appwidget.AppWidgetProviderInfo;
     21 import android.content.Context;
     22 import com.android.systemui.recents.misc.SystemServicesProxy;
     23 import com.android.systemui.recents.model.RecentsTaskLoader;
     24 
     25 /** Our special app widget host for the Search widget */
     26 public class RecentsAppWidgetHost extends AppWidgetHost {
     27 
     28     /* Callbacks to notify when an app package changes */
     29     interface RecentsAppWidgetHostCallbacks {
     30         public void refreshSearchWidget();
     31     }
     32 
     33     Context mContext;
     34     RecentsAppWidgetHostCallbacks mCb;
     35     RecentsConfiguration mConfig;
     36     boolean mIsListening;
     37 
     38     public RecentsAppWidgetHost(Context context, int hostId) {
     39         super(context, hostId);
     40         mContext = context;
     41         mConfig = RecentsConfiguration.getInstance();
     42     }
     43 
     44     public void startListening(RecentsAppWidgetHostCallbacks cb) {
     45         mCb = cb;
     46         if (!mIsListening) {
     47             mIsListening = true;
     48             super.startListening();
     49         }
     50     }
     51 
     52     @Override
     53     public void stopListening() {
     54         if (mIsListening) {
     55             super.stopListening();
     56         }
     57         // Ensure that we release any references to the callbacks
     58         mCb = null;
     59         mContext = null;
     60         mIsListening = false;
     61     }
     62 
     63     @Override
     64     protected void onProviderChanged(int appWidgetId, AppWidgetProviderInfo appWidgetInfo) {
     65         if (mCb == null) return;
     66 
     67         SystemServicesProxy ssp = RecentsTaskLoader.getInstance().getSystemServicesProxy();
     68         if (appWidgetId > -1 && appWidgetId == mConfig.searchBarAppWidgetId) {
     69             // The search provider may have changed, so just delete the old widget and bind it again
     70             ssp.unbindSearchAppWidget(this, appWidgetId);
     71             // Update the search widget
     72             mConfig.updateSearchBarAppWidgetId(mContext, -1);
     73             mCb.refreshSearchWidget();
     74         }
     75     }
     76 }
     77