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      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.dialer.app.calllog;
     18 
     19 import android.support.v7.widget.RecyclerView;
     20 import android.view.LayoutInflater;
     21 import android.view.View;
     22 import android.view.ViewGroup;
     23 import com.android.dialer.app.R;
     24 import com.android.dialer.app.alert.AlertManager;
     25 import com.android.dialer.common.Assert;
     26 
     27 /** Manages "alerts" to be shown at the top of an call log to gain the user's attention. */
     28 public class CallLogAlertManager implements AlertManager {
     29 
     30   private final CallLogAdapter adapter;
     31   private final View view;
     32   private final LayoutInflater inflater;
     33   private final ViewGroup parent;
     34   private final ViewGroup container;
     35 
     36   public CallLogAlertManager(CallLogAdapter adapter, LayoutInflater inflater, ViewGroup parent) {
     37     this.adapter = adapter;
     38     this.inflater = inflater;
     39     this.parent = parent;
     40     view = inflater.inflate(R.layout.call_log_alert_item, parent, false);
     41     container = (ViewGroup) view.findViewById(R.id.container);
     42   }
     43 
     44   @Override
     45   public View inflate(int layoutId) {
     46     return inflater.inflate(layoutId, container, false);
     47   }
     48 
     49   public RecyclerView.ViewHolder createViewHolder(ViewGroup parent) {
     50     Assert.checkArgument(
     51         parent == this.parent,
     52         "createViewHolder should be called with the same parent in constructor");
     53     return new AlertViewHolder(view);
     54   }
     55 
     56   public boolean isEmpty() {
     57     return container.getChildCount() == 0;
     58   }
     59 
     60   public boolean contains(View view) {
     61     return container.indexOfChild(view) != -1;
     62   }
     63 
     64   @Override
     65   public void clear() {
     66     container.removeAllViews();
     67     adapter.notifyItemRemoved(CallLogAdapter.ALERT_POSITION);
     68   }
     69 
     70   @Override
     71   public void add(View view) {
     72     if (contains(view)) {
     73       return;
     74     }
     75     container.addView(view);
     76     if (container.getChildCount() == 1) {
     77       // Was empty before
     78       adapter.notifyItemInserted(CallLogAdapter.ALERT_POSITION);
     79     }
     80   }
     81 
     82   /**
     83    * Does nothing. The view this ViewHolder show is directly managed by {@link CallLogAlertManager}
     84    */
     85   private static class AlertViewHolder extends RecyclerView.ViewHolder {
     86     private AlertViewHolder(View view) {
     87       super(view);
     88     }
     89   }
     90 }
     91