ListWithHeaderListAdapter.java :  » UnTagged » phonebooksharing » com » phonebooksharing » android » widgets » header » Android Open Source

/*
 * Copyright (C) 2008 Jeffrey Sharkey, http://jsharkey.org/ 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 com.phonebooksharing.android.widgets.header;

import java.util.LinkedHashMap;
import java.util.Map;

import android.content.Context;
import android.database.DataSetObserver;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Adapter;
import android.widget.ArrayAdapter;
import android.widget.BaseAdapter;

import com.phonebooksharing.android.R;

public class ListWithHeaderListAdapter extends BaseAdapter {

    public final Map<String, Adapter> sections    = new LinkedHashMap<String, Adapter>();
    public final ArrayAdapter<String> headers;
    public final static int           TYPE_HEADER = 0;
    
    /**
     * Used by the {@link RecommendService} to report changes in the list back to
     * this adapter.
     */
    public class MyDataSetObserver extends DataSetObserver {
        @Override
        public void onChanged() {
            notifyDataSetChanged();
        }

        @Override
        public void onInvalidated() {
            notifyDataSetInvalidated();
        }
    }

    public ListWithHeaderListAdapter(Context context) {
        headers = new ArrayAdapter<String>(context, R.layout.list_header_layout);
    }

    public void addSection(String section, Adapter adapter) {
        this.headers.add(section);
        this.sections.put(section, adapter);
    }

    public Object getItem(int position) {
        for (Object section : this.sections.keySet()) {
            Adapter adapter = sections.get(section);
            int size = adapter.getCount() + 1;

            // check if position inside this section
            if (position == 0) return section;
            if (position < size) return adapter.getItem(position - 1);

            // otherwise jump into next section
            position -= size;
        }
        return null;
    }

    public int getCount() {
        // total together all sections, plus one for each section header
        int total = 0;
        for (Adapter adapter : this.sections.values())
            total += adapter.getCount() + 1;
        return total;
    }

    public int getViewTypeCount() {
        // assume that headers count as one, then total all sections
        int total = 1;
        for (Adapter adapter : this.sections.values())
            total += adapter.getViewTypeCount();
        return total;
    }

    public int getItemViewType(int position) {
        int type = 1;
        for (Object section : this.sections.keySet()) {
            Adapter adapter = sections.get(section);
            int size = adapter.getCount() + 1;

            // check if position inside this section
            if (position == 0) return TYPE_HEADER;
            if (position < size) return type + adapter.getItemViewType(position - 1);

            // otherwise jump into next section
            position -= size;
            type += adapter.getViewTypeCount();
        }
        return -1;
    }

    public boolean areAllItemsSelectable() {
        return false;
    }

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

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        int sectionnum = 0;
        for (Object section : this.sections.keySet()) {
            Adapter adapter = sections.get(section);
            int size = adapter.getCount() + 1;

            // check if position inside this section
            if (position == 0) return headers.getView(sectionnum, convertView, parent);
            if (position < size) return adapter.getView(position - 1, convertView, parent);

            // otherwise jump into next section
            position -= size;
            sectionnum++;
        }
        return null;
    }

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