1 /*
2  * Copyright (C) 2015 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.messaging.ui;
17 
18 import android.content.Context;
19 import android.database.Cursor;
20 import android.view.LayoutInflater;
21 import android.view.View;
22 import android.view.ViewGroup;
23 import android.widget.AbsListView;
24 import android.widget.AbsListView.OnScrollListener;
25 import android.widget.CursorAdapter;
26 import android.widget.ListView;
27 
28 import com.android.messaging.util.ImeUtil;
29 
30 /**
31  * Produces and holds a list view and its tab header to be displayed in a ViewPager.
32  */
33 public abstract class CustomHeaderPagerListViewHolder extends BasePagerViewHolder
34         implements CustomHeaderPagerViewHolder {
35     private final Context mContext;
36     private final CursorAdapter mListAdapter;
37     private boolean mListCursorInitialized;
38     private ListView mListView;
39 
CustomHeaderPagerListViewHolder(final Context context, final CursorAdapter adapter)40     public CustomHeaderPagerListViewHolder(final Context context,
41             final CursorAdapter adapter) {
42         mContext = context;
43         mListAdapter = adapter;
44     }
45 
46     @Override
createView(ViewGroup container)47     protected View createView(ViewGroup container) {
48         final LayoutInflater inflater = (LayoutInflater)
49                 mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
50         final View view = inflater.inflate(
51                 getLayoutResId(),
52                 null /* root */,
53                 false /* attachToRoot */);
54         final ListView listView = (ListView) view.findViewById(getListViewResId());
55         listView.setAdapter(mListAdapter);
56         listView.setOnScrollListener(new OnScrollListener() {
57             @Override
58             public void onScrollStateChanged(final AbsListView view, final int scrollState) {
59                 if (scrollState != SCROLL_STATE_IDLE) {
60                     ImeUtil.get().hideImeKeyboard(mContext, view);
61                 }
62             }
63 
64             @Override
65             public void onScroll(final AbsListView view, final int firstVisibleItem,
66                     final int visibleItemCount, final int totalItemCount) {
67             }
68         });
69         mListView = listView;
70         maybeSetEmptyView();
71         return view;
72     }
73 
onContactsCursorUpdated(final Cursor data)74     public void onContactsCursorUpdated(final Cursor data) {
75         mListAdapter.swapCursor(data);
76         if (!mListCursorInitialized) {
77             // We set the emptyView here instead of in create so that the initial load won't show
78             // the empty UI - the system handles this and doesn't do what we would like.
79             mListCursorInitialized = true;
80             maybeSetEmptyView();
81         }
82     }
83 
84     /**
85      *  We don't want to show the empty view hint until BOTH conditions are met:
86      *  1. The view has been created.
87      *  2. Cursor data has been loaded once.
88      *  Due to timing when data is loaded, the view may not be ready (and vice versa). So we
89      *  are calling this method from both onContactsCursorUpdated & createView.
90      */
maybeSetEmptyView()91     private void maybeSetEmptyView() {
92         if (mView != null && mListCursorInitialized) {
93             final ListEmptyView emptyView = (ListEmptyView) mView.findViewById(getEmptyViewResId());
94             if (emptyView != null) {
95                 emptyView.setTextHint(getEmptyViewTitleResId());
96                 emptyView.setImageHint(getEmptyViewImageResId());
97                 final ListView listView = (ListView) mView.findViewById(getListViewResId());
98                 listView.setEmptyView(emptyView);
99             }
100         }
101     }
102 
invalidateList()103     public void invalidateList() {
104         mListAdapter.notifyDataSetChanged();
105     }
106 
107     /**
108      * In order for scene transition to work, we toggle the visibility for each individual list
109      * view items so that they can be properly tracked by the scene transition manager.
110      * @param show whether the pending transition is to show or hide the list.
111      */
toggleVisibilityForPendingTransition(final boolean show, final View epicenterView)112     public void toggleVisibilityForPendingTransition(final boolean show, final View epicenterView) {
113         if (mListView == null) {
114             return;
115         }
116         final int childCount = mListView.getChildCount();
117         for (int i = 0; i < childCount; i++) {
118             final View childView = mListView.getChildAt(i);
119             if (childView != epicenterView) {
120                 childView.setVisibility(show ? View.VISIBLE : View.INVISIBLE);
121             }
122         }
123     }
124 
125     @Override
getPageTitle(Context context)126     public CharSequence getPageTitle(Context context) {
127         return context.getString(getPageTitleResId());
128     }
129 
getLayoutResId()130     protected abstract int getLayoutResId();
getPageTitleResId()131     protected abstract int getPageTitleResId();
getEmptyViewResId()132     protected abstract int getEmptyViewResId();
getEmptyViewTitleResId()133     protected abstract int getEmptyViewTitleResId();
getEmptyViewImageResId()134     protected abstract int getEmptyViewImageResId();
getListViewResId()135     protected abstract int getListViewResId();
136 }
137