BaseListFragment.java

/* 
 	Copyright 2010-2012 Cesar Valiente Gordo
 
 	This file is part of QuiteSleep.

    QuiteSleep 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.

    QuiteSleep 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 QuiteSleep.  If not, see <http://www.gnu.org/licenses/>.
 */

package es.cesar.quitesleep.ui.fragments.base;

import java.util.List;

import android.os.Bundle;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ListView;

import com.actionbarsherlock.app.SherlockListFragment;

/**
 * 
 * @author Cesar Valiente Gordo (cesar.valiente@gmail.com)
 * 
 *         This activity is used as base of list activities or (fragments) in
 *         along the app to have different commons features without the
 *         necessity to implement the same code over and over again.
 */
public abstract class BaseListFragment extends SherlockListFragment {

    public ArrayAdapter<String> myOwnAdapter;

    // Used to fix the index cursor when we delete items from the list
    private boolean fixIndexCursor = false;

    @Override
    public void onCreate(final Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

    }

    /**
     * Get all defined info from the database and parse it for create one list
     * only with the {@link String} info.
     * 
     * @param dataInfoList
     */
    public abstract void getDataInfo(List<String> dataInfoList);

    /**
     * Refreshes the list to also can use properly the indexer and fastScroll
     */
    protected void refreshList() {

        /*
         * To refresh the indexer we need to disable the fastScroll, call to
         * notifyDataSetChanged, re-create the index sections and enable again
         * the fastScroll. After that call to the function which fix a problem
         * with the view which shows the section index.
         */
        getListView().setFastScrollEnabled(false);
        myOwnAdapter.notifyDataSetChanged();
        getListView().setFastScrollEnabled(true);
        jiggleWidth();
    }

    /**
     * This function fixes the known problem {@link http://code.google.com/p/
     * android/issues/detail?id=9054} the patch was founded in {@link http
     * ://stackoverflow.com/questions/2912082/
     * section-indexer-overlay-is-not-updating-as-the-adapters-data-changes}.
     * 
     * Is not really elegant, but it seems is the known way to fix it.
     */
    private void jiggleWidth() {

        ListView view = getListView();
        if (view.getWidth() <= 0) {
            return;
        }
        int newWidth = fixIndexCursor ? view.getWidth() - 1
                : view.getWidth() + 1;
        ViewGroup.LayoutParams params = view.getLayoutParams();
        params.width = newWidth;
        view.setLayoutParams(params);

        fixIndexCursor = !fixIndexCursor;
    }

}