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/*
* Copyright (C) 2015 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.messaging.ui;
import android.content.Context;
import android.database.Cursor;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.AbsListView.OnScrollListener;
import android.widget.CursorAdapter;
import android.widget.ListView;
import com.android.messaging.util.ImeUtil;
/**
* Produces and holds a list view and its tab header to be displayed in a ViewPager.
*/
public abstract class CustomHeaderPagerListViewHolder extends BasePagerViewHolder
implements CustomHeaderPagerViewHolder {
private final Context mContext;
private final CursorAdapter mListAdapter;
private boolean mListCursorInitialized;
private ListView mListView;
public CustomHeaderPagerListViewHolder(final Context context,
final CursorAdapter adapter) {
mContext = context;
mListAdapter = adapter;
}
@Override
protected View createView(ViewGroup container) {
final LayoutInflater inflater = (LayoutInflater)
mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
final View view = inflater.inflate(
getLayoutResId(),
null /* root */,
false /* attachToRoot */);
final ListView listView = (ListView) view.findViewById(getListViewResId());
listView.setAdapter(mListAdapter);
listView.setOnScrollListener(new OnScrollListener() {
@Override
public void onScrollStateChanged(final AbsListView view, final int scrollState) {
if (scrollState != SCROLL_STATE_IDLE) {
ImeUtil.get().hideImeKeyboard(mContext, view);
}
}
@Override
public void onScroll(final AbsListView view, final int firstVisibleItem,
final int visibleItemCount, final int totalItemCount) {
}
});
mListView = listView;
maybeSetEmptyView();
return view;
}
public void onContactsCursorUpdated(final Cursor data) {
mListAdapter.swapCursor(data);
if (!mListCursorInitialized) {
// We set the emptyView here instead of in create so that the initial load won't show
// the empty UI - the system handles this and doesn't do what we would like.
mListCursorInitialized = true;
maybeSetEmptyView();
}
}
/**
* We don't want to show the empty view hint until BOTH conditions are met:
* 1. The view has been created.
* 2. Cursor data has been loaded once.
* Due to timing when data is loaded, the view may not be ready (and vice versa). So we
* are calling this method from both onContactsCursorUpdated & createView.
*/
private void maybeSetEmptyView() {
if (mView != null && mListCursorInitialized) {
final ListEmptyView emptyView = (ListEmptyView) mView.findViewById(getEmptyViewResId());
if (emptyView != null) {
emptyView.setTextHint(getEmptyViewTitleResId());
emptyView.setImageHint(getEmptyViewImageResId());
final ListView listView = (ListView) mView.findViewById(getListViewResId());
listView.setEmptyView(emptyView);
}
}
}
public void invalidateList() {
mListAdapter.notifyDataSetChanged();
}
/**
* In order for scene transition to work, we toggle the visibility for each individual list
* view items so that they can be properly tracked by the scene transition manager.
* @param show whether the pending transition is to show or hide the list.
*/
public void toggleVisibilityForPendingTransition(final boolean show, final View epicenterView) {
if (mListView == null) {
return;
}
final int childCount = mListView.getChildCount();
for (int i = 0; i < childCount; i++) {
final View childView = mListView.getChildAt(i);
if (childView != epicenterView) {
childView.setVisibility(show ? View.VISIBLE : View.INVISIBLE);
}
}
}
@Override
public CharSequence getPageTitle(Context context) {
return context.getString(getPageTitleResId());
}
protected abstract int getLayoutResId();
protected abstract int getPageTitleResId();
protected abstract int getEmptyViewResId();
protected abstract int getEmptyViewTitleResId();
protected abstract int getEmptyViewImageResId();
protected abstract int getListViewResId();
}
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