| /* |
| * 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.android.contacts.common.list; |
| |
| import android.content.Context; |
| import android.view.View; |
| import android.view.ViewGroup; |
| |
| import com.android.common.widget.CompositeCursorAdapter; |
| |
| /** |
| * 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 getPinnedPartitionHeadersEnabled() && 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)); |
| view.setLayoutDirection(parent.getLayoutDirection()); |
| return view; |
| } else { |
| return null; |
| } |
| } |
| |
| @Override |
| public void configurePinnedHeaders(PinnedHeaderListView listView) { |
| if (!getPinnedPartitionHeadersEnabled()) { |
| 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; |
| |
| listView.setHeaderPinnedAtBottom(i, listHeight - bottomHeaderHeight, false); |
| 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); |
| } |
| } |