package morepaste.util;

import java.io.Serializable;
import java.awt.*;
import java.awt.event.*;
import java.util.NoSuchElementException;
import javax.swing.*;

/**
 * @version 1.0.1 2002-01-26
 * @author Takashi KOBAYASHI
 */
public class ListChecker extends MouseAdapter {
	private JList jl;
	private CheckBoxCellRenderer ccr;

	public ListChecker( JList l, CheckBoxCellRenderer c ) {
		jl = l;
		ccr = c;
	}

	public void mouseClicked( MouseEvent e ) {
		Point p = e.getPoint();
		int idx = jl.locationToIndex( p );
		CheckBoxListModel clm = (CheckBoxListModel)jl.getModel();
		try {
		if( idx > -1 && idx < jl.getModel().getSize()
			&& clm.getElementAt( idx ) != null
			&& clm.isEnabledAt( idx )
			&& (e.getModifiers() & InputEvent.BUTTON1_MASK) != 0
			&& (
			ccr.isInCheckBox( toLocationInCell( p ), clm.getElementAt( idx ).toString() )
			|| e.getClickCount() == 2
			)
		) {
			clm.setSelectedAt( idx, ! clm.isSelectedAt( idx ) );
			jl.repaint();
		}
		}
		catch( NoSuchElementException exp ) {}
	}

	private Point toLocationInCell( Point p ) {
		int idx = jl.locationToIndex( p );

		if( idx == 0 ){
			return p;
		}
		else {
			Rectangle r = jl.getCellBounds( 0, idx - 1 );
			return new Point( p.x, p.y - r.height );
		}
	}
}