| /* |
| * Copyright (C) 2013 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.documentsui; |
| |
| import android.view.View; |
| import android.view.ViewGroup; |
| import android.widget.AdapterView; |
| import android.widget.BaseAdapter; |
| import android.widget.ListAdapter; |
| |
| import java.util.ArrayList; |
| |
| /** |
| * Adapter that combines multiple adapters as sections, asking each section to |
| * provide a header, and correctly handling item types across child adapters. |
| */ |
| public class SectionedListAdapter extends BaseAdapter { |
| private ArrayList<SectionAdapter> mSections = new ArrayList<>(); |
| |
| public interface SectionAdapter extends ListAdapter { |
| public View getHeaderView(View convertView, ViewGroup parent); |
| } |
| |
| public void clearSections() { |
| mSections.clear(); |
| notifyDataSetChanged(); |
| } |
| |
| /** |
| * After mutating sections, you <em>must</em> |
| * {@link AdapterView#setAdapter(android.widget.Adapter)} to correctly |
| * recount view types. |
| */ |
| public void addSection(SectionAdapter adapter) { |
| mSections.add(adapter); |
| notifyDataSetChanged(); |
| } |
| |
| @Override |
| public int getCount() { |
| int count = 0; |
| final int size = mSections.size(); |
| for (int i = 0; i < size; i++) { |
| count += mSections.get(i).getCount() + 1; |
| } |
| return count; |
| } |
| |
| @Override |
| public Object getItem(int position) { |
| final int size = mSections.size(); |
| for (int i = 0; i < size; i++) { |
| final SectionAdapter section = mSections.get(i); |
| final int sectionSize = section.getCount() + 1; |
| |
| // Check if position inside this section |
| if (position == 0) { |
| return section; |
| } else if (position < sectionSize) { |
| return section.getItem(position - 1); |
| } |
| |
| // Otherwise jump into next section |
| position -= sectionSize; |
| } |
| throw new IllegalStateException("Unknown position " + position); |
| } |
| |
| @Override |
| public long getItemId(int position) { |
| return position; |
| } |
| |
| @Override |
| public View getView(int position, View convertView, ViewGroup parent) { |
| final int size = mSections.size(); |
| for (int i = 0; i < size; i++) { |
| final SectionAdapter section = mSections.get(i); |
| final int sectionSize = section.getCount() + 1; |
| |
| // Check if position inside this section |
| if (position == 0) { |
| return section.getHeaderView(convertView, parent); |
| } else if (position < sectionSize) { |
| return section.getView(position - 1, convertView, parent); |
| } |
| |
| // Otherwise jump into next section |
| position -= sectionSize; |
| } |
| throw new IllegalStateException("Unknown position " + position); |
| } |
| |
| @Override |
| public boolean areAllItemsEnabled() { |
| return false; |
| } |
| |
| @Override |
| public boolean isEnabled(int position) { |
| final int size = mSections.size(); |
| for (int i = 0; i < size; i++) { |
| final SectionAdapter section = mSections.get(i); |
| final int sectionSize = section.getCount() + 1; |
| |
| // Check if position inside this section |
| if (position == 0) { |
| return false; |
| } else if (position < sectionSize) { |
| return section.isEnabled(position - 1); |
| } |
| |
| // Otherwise jump into next section |
| position -= sectionSize; |
| } |
| throw new IllegalStateException("Unknown position " + position); |
| } |
| |
| @Override |
| public int getItemViewType(int position) { |
| int type = 1; |
| final int size = mSections.size(); |
| for (int i = 0; i < size; i++) { |
| final SectionAdapter section = mSections.get(i); |
| final int sectionSize = section.getCount() + 1; |
| |
| // Check if position inside this section |
| if (position == 0) { |
| return 0; |
| } else if (position < sectionSize) { |
| return type + section.getItemViewType(position - 1); |
| } |
| |
| // Otherwise jump into next section |
| position -= sectionSize; |
| type += section.getViewTypeCount(); |
| } |
| throw new IllegalStateException("Unknown position " + position); |
| } |
| |
| @Override |
| public int getViewTypeCount() { |
| int count = 1; |
| final int size = mSections.size(); |
| for (int i = 0; i < size; i++) { |
| count += mSections.get(i).getViewTypeCount(); |
| } |
| return count; |
| } |
| } |