diff options
Diffstat (limited to 'src/com/android/launcher3/list/PinnedHeaderListAdapter.java')
-rw-r--r-- | src/com/android/launcher3/list/PinnedHeaderListAdapter.java | 137 |
1 files changed, 137 insertions, 0 deletions
diff --git a/src/com/android/launcher3/list/PinnedHeaderListAdapter.java b/src/com/android/launcher3/list/PinnedHeaderListAdapter.java new file mode 100644 index 000000000..cc053e18f --- /dev/null +++ b/src/com/android/launcher3/list/PinnedHeaderListAdapter.java @@ -0,0 +1,137 @@ +/* + * 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.launcher3.list; + +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 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(); + boolean unCached = false; + // Cache visibility bits, because we will need them several times later on + if (mHeaderVisibility == null || mHeaderVisibility.length != size) { + mHeaderVisibility = new boolean[size]; + unCached = true; + } + 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 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; + } + + if (!unCached){ + listView.setHeaderPinnedAtTop(i, topHeaderHeight, false); + topHeaderHeight += listView.getPinnedHeaderHeight(i); + } + + } + } + } + + @Override + public int getScrollPositionForHeader(int viewIndex) { + return getPositionForPartition(viewIndex); + } +}
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