SectionedAdapter.java :  » Schedule » devoxx-schedule-android » be » vangodtsenhoven » devoxx » adapters » Android Open Source

/***
 Copyright (c) 2008-2010 CommonsWare, LLC
 portions Copyright (c) 2008-10 Jeffrey Sharkey

 This program is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation, either version 3 of the License, or
 (at your option) any later version.

 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package be.vangodtsenhoven.devoxx.adapters;

import java.util.ArrayList;
import java.util.List;

import android.view.View;
import android.view.ViewGroup;
import android.widget.Adapter;
import android.widget.BaseAdapter;

abstract public class SectionedAdapter extends BaseAdapter {
  abstract protected View getHeaderView(String caption, int index,
      View convertView, ViewGroup parent);

  private List<Section> sections = new ArrayList<Section>();
  private static int TYPE_SECTION_HEADER = 0;

  public SectionedAdapter() {
    super();
  }

  public void addSection(String caption, Adapter adapter) {
    sections.add(new Section(caption, adapter));
  }

  public Object getItem(int position) {
    for (Section section : this.sections) {
      if (position == 0) {
        return (section);
      }

      int size = section.adapter.getCount() + 1;

      if (position < size) {
        return (section.adapter.getItem(position - 1));
      }

      position -= size;
    }

    return (null);
  }

  public int getCount() {
    int total = 0;

    for (Section section : this.sections) {
      total += section.adapter.getCount() + 1; // add one for header
    }

    return (total);
  }

  public int getViewTypeCount() {
    int total = 1; // one for the header, plus those from sections

    for (Section section : this.sections) {
      total += section.adapter.getViewTypeCount();
    }

    return (total);
  }

  public int getItemViewType(int position) {
    int typeOffset = TYPE_SECTION_HEADER + 1; // start counting from here

    for (Section section : this.sections) {
      if (position == 0) {
        return (TYPE_SECTION_HEADER);
      }

      int size = section.adapter.getCount() + 1;

      if (position < size) {
        return (typeOffset + section.adapter
            .getItemViewType(position - 1));
      }

      position -= size;
      typeOffset += section.adapter.getViewTypeCount();
    }

    return (-1);
  }

  public boolean areAllItemsSelectable() {
    return (false);
  }

  public boolean isEnabled(int position) {
    return (getItemViewType(position) != TYPE_SECTION_HEADER);
  }

  public View getView(int position, View convertView, ViewGroup parent) {
    int sectionIndex = 0;

    for (Section section : this.sections) {
      if (position == 0) {
        return (getHeaderView(section.caption, sectionIndex,
            convertView, parent));
      }

      int size = section.adapter.getCount() + 1;

      if (position < size) {
        return (section.adapter.getView(position - 1, convertView,
            parent));
      }

      position -= size;
      sectionIndex++;
    }

    return (null);
  }

  public long getItemId(int position) {
    return (position);
  }

  class Section {
    String caption;
    Adapter adapter;

    Section(String caption, Adapter adapter) {
      this.caption = caption;
      this.adapter = adapter;
    }
  }
}