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      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 
     40     public CustomHeaderPagerListViewHolder(final Context context,
     41             final CursorAdapter adapter) {
     42         mContext = context;
     43         mListAdapter = adapter;
     44     }
     45 
     46     @Override
     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 
     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      */
     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 
    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      */
    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
    126     public CharSequence getPageTitle(Context context) {
    127         return context.getString(getPageTitleResId());
    128     }
    129 
    130     protected abstract int getLayoutResId();
    131     protected abstract int getPageTitleResId();
    132     protected abstract int getEmptyViewResId();
    133     protected abstract int getEmptyViewTitleResId();
    134     protected abstract int getEmptyViewImageResId();
    135     protected abstract int getListViewResId();
    136 }
    137