Android Open Source - TaskButler Comparator List Adapter

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License

The source code is released under:

GNU General Public License

Java Source Code

/*
 * ComparatorListAdapter.java/*  w  w  w  .j  a  v  a2 s.  c om*/
 *
 * Copyright 2012 Jonathan Hasenzahl, James Celona, Dhimitraq Jorgji
 * 
 * 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 edu.worcester.cs499summer2012.adapter;

import java.util.ArrayList;
import android.app.Activity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.CheckBox;
import android.widget.ImageView;
import android.widget.TextView;
import edu.worcester.cs499summer2012.R;
import edu.worcester.cs499summer2012.database.TasksDataSource;
import edu.worcester.cs499summer2012.task.Comparator;

/**
 * 
 * @author Jonathan Hasenzahl
 */
public class ComparatorListAdapter extends ArrayAdapter<Comparator> {

  /**************************************************************************
   * Static fields and methods                                              *
   **************************************************************************/
  
  static class ViewHolder {
    public CheckBox enabled;
    public TextView name;
    public ImageView up;
    public ImageView down;
  }
  
  /**************************************************************************
   * Private fields                                                         *
   **************************************************************************/
  
  private final Activity activity;
  private final ArrayList<Comparator> comparators;
  private TasksDataSource data_source;
  
  /**************************************************************************
   * Constructors                                                           *
   **************************************************************************/
  
  /**
   * Default constructor.
   * @param
   * @param
   */
  public ComparatorListAdapter(Activity activity, ArrayList<Comparator> comparators) {
    super(activity, R.layout.row_comparator, comparators);
    this.activity = activity;
    this.comparators = comparators;
    data_source = TasksDataSource.getInstance(this.activity);
    setNotifyOnChange(true);
  }
  
  /**************************************************************************
   * Overridden parent methods                                              *
   **************************************************************************/
  
  /**
   * This method is called automatically when the user scrolls the ListView.
   * Updates the View of a single visible row, reflecting the list being 
   * scrolled by the user.
   * @param position the index of the TaskList
   * @param convert_view the View to be updated
   * @param parent the parent ViewGroup of convert_view
   * @return the updated View
   */
  @Override
  public View getView(int position, View convert_view, ViewGroup parent) {
    View view = convert_view;
    Comparator comparator = comparators.get(position);
    
    if (view == null) {    
      LayoutInflater inflater = activity.getLayoutInflater();
      view = inflater.inflate(R.layout.row_comparator, null);
      
      final ViewHolder view_holder = new ViewHolder();
      view_holder.enabled = (CheckBox) view.findViewById(R.id.checkbox_row_comparator_enabled);
      view_holder.name = (TextView) view.findViewById(R.id.text_row_comparator_name);
      view_holder.up = (ImageView) view.findViewById(R.id.image_row_comparator_up);
      view_holder.up.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
          // User wants to move this comparator up in the list (decrease order by 1)
          Comparator comparator = (Comparator) view_holder.enabled.getTag();
          int old_order = comparator.getOrder();
          
          // Check to see if this comparator is at the top of the list
          if (old_order == 0)
            return;
          
          // Grab the affected comparator and modify both of their orders
          int new_order = old_order - 1;
          Comparator displaced_comparator = comparators.get(new_order);
          comparator.setOrder(new_order);
          displaced_comparator.setOrder(old_order);
          
          // Update their positions in the adapter
          comparators.set(old_order, displaced_comparator);
          comparators.set(new_order, comparator);
          
          // Update both comparators in the database
          data_source.updateComparator(comparator);
          data_source.updateComparator(displaced_comparator);
          
          notifyDataSetChanged();
        }
        
      });
      view_holder.down = (ImageView) view.findViewById(R.id.image_row_comparator_down);
      view_holder.down.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
          // User wants to move this comparator down in the list (increase order by 1)
          Comparator comparator = (Comparator) view_holder.enabled.getTag();
          int old_order = comparator.getOrder();
          
          // Check to see if this comparator is at the bottom of the list
          if (old_order == Comparator.NUM_COMPARATORS - 1)
            return;
          
          // Grab the affected comparator and modify both of their orders
          int new_order = old_order + 1;
          Comparator displaced_comparator = comparators.get(new_order);
          comparator.setOrder(new_order);
          displaced_comparator.setOrder(old_order);
          
          // Update their positions in the adapter
          comparators.set(old_order, displaced_comparator);
          comparators.set(new_order, comparator);
          
          // Update both comparators in the database
          data_source.updateComparator(comparator);
          data_source.updateComparator(displaced_comparator);
          
          notifyDataSetChanged();
        }
        
      });
      
      view.setTag(view_holder);
      view_holder.enabled.setTag(comparator);
    } else
      ((ViewHolder) view.getTag()).enabled.setTag(comparator); 

    ViewHolder holder = (ViewHolder) view.getTag();
    
    // Set is enabled
    boolean is_enabled = comparator.isEnabled();
    holder.enabled.setChecked(is_enabled);
    
    // Set name
    holder.name.setText(comparator.getName());
    holder.name.setEnabled(is_enabled);
    
    // Set arrows
    holder.up.setImageResource(is_enabled ? R.drawable.ic_up_active : R.drawable.ic_up_inactive);
    holder.down.setImageResource(is_enabled ? R.drawable.ic_down_active : R.drawable.ic_down_inactive);
    
    return view;
  }
}

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