/*
Copyright © 2013-2014, Silent Circle, LLC.
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Any redistribution, use, or modification is done solely for personal
benefit and not for any commercial purpose or for monetary gain
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
* Neither the name Silent Circle nor the names of its contributors may
be used to endorse or promote products derived from this software
without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL SILENT CIRCLE, LLC BE LIABLE FOR ANY
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* This implementation is edited version of original Android sources.
*/
/*
* Copyright (C) 2010 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.silentcircle.contacts.widget;
import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
/**
* A subclass of {@link CompositeCursorAdapter} that manages pinned partition headers.
*/
public abstract class PinnedHeaderListAdapter extends CompositeCursorAdapter
implements PinnedHeaderListView.PinnedHeaderAdapter {
public static final int PARTITION_HEADER_TYPE = 0;
private boolean mPinnedPartitionHeadersEnabled;
private boolean mHeaderVisibility[];
public PinnedHeaderListAdapter(Context context) {
super(context);
}
public PinnedHeaderListAdapter(Context context, int initialCapacity) {
super(context, initialCapacity);
}
public boolean getPinnedPartitionHeadersEnabled() {
return mPinnedPartitionHeadersEnabled;
}
public void setPinnedPartitionHeadersEnabled(boolean flag) {
this.mPinnedPartitionHeadersEnabled = flag;
}
@Override
public int getPinnedHeaderCount() {
if (mPinnedPartitionHeadersEnabled) {
return getPartitionCount();
} else {
return 0;
}
}
protected boolean isPinnedPartitionHeaderVisible(int partition) {
return mPinnedPartitionHeadersEnabled && hasHeader(partition)
&& !isPartitionEmpty(partition);
}
/**
* The default implementation creates the same type of view as a normal
* partition header.
*/
@Override
public View getPinnedHeaderView(int partition, View convertView, ViewGroup parent) {
if (hasHeader(partition)) {
View view = null;
if (convertView != null) {
Integer headerType = (Integer)convertView.getTag();
if (headerType != null && headerType == PARTITION_HEADER_TYPE) {
view = convertView;
}
}
if (view == null) {
view = newHeaderView(getContext(), partition, null, parent);
view.setTag(PARTITION_HEADER_TYPE);
view.setFocusable(false);
view.setEnabled(false);
}
bindHeaderView(view, partition, getCursor(partition));
return view;
} else {
return null;
}
}
@Override
public void configurePinnedHeaders(PinnedHeaderListView listView) {
if (!mPinnedPartitionHeadersEnabled) {
return;
}
int size = getPartitionCount();
// Cache visibility bits, because we will need them several times later on
if (mHeaderVisibility == null || mHeaderVisibility.length != size) {
mHeaderVisibility = new boolean[size];
}
for (int i = 0; i < size; i++) {
boolean visible = isPinnedPartitionHeaderVisible(i);
mHeaderVisibility[i] = visible;
if (!visible) {
listView.setHeaderInvisible(i, true);
}
}
int headerViewsCount = listView.getHeaderViewsCount();
// Starting at the top, find and pin headers for partitions preceding the visible one(s)
int maxTopHeader = -1;
int topHeaderHeight = 0;
for (int i = 0; i < size; i++) {
if (mHeaderVisibility[i]) {
int position = listView.getPositionAt(topHeaderHeight) - headerViewsCount;
int partition = getPartitionForPosition(position);
if (i > partition) {
break;
}
listView.setHeaderPinnedAtTop(i, topHeaderHeight, false);
topHeaderHeight += listView.getPinnedHeaderHeight(i);
maxTopHeader = i;
}
}
// Starting at the bottom, find and pin headers for partitions following the visible one(s)
int maxBottomHeader = size;
int bottomHeaderHeight = 0;
int listHeight = listView.getHeight();
for (int i = size; --i > maxTopHeader;) {
if (mHeaderVisibility[i]) {
int position = listView.getPositionAt(listHeight - bottomHeaderHeight)
- headerViewsCount;
if (position < 0) {
break;
}
int partition = getPartitionForPosition(position - 1);
if (partition == -1 || i <= partition) {
break;
}
int height = listView.getPinnedHeaderHeight(i);
bottomHeaderHeight += height;
// Animate the header only if the partition is completely invisible below
// the bottom of the view
int firstPositionForPartition = getPositionForPartition(i);
boolean animate = position < firstPositionForPartition;
listView.setHeaderPinnedAtBottom(i, listHeight - bottomHeaderHeight, animate);
maxBottomHeader = i;
}
}
// Headers in between the top-pinned and bottom-pinned should be hidden
for (int i = maxTopHeader + 1; i < maxBottomHeader; i++) {
if (mHeaderVisibility[i]) {
listView.setHeaderInvisible(i, isPartitionEmpty(i));
}
}
}
@Override
public int getScrollPositionForHeader(int viewIndex) {
return getPositionForPartition(viewIndex);
}
}