package graph.filter;
import graph.*;
import java.awt.*;
import java.util.Vector;

/**
 * A catalog for filter prototypes.  When the user hits the
 * <i>add</i> button in the FilterBank, a FilterPalette is
 * displayed.  For now, this is simply a list of available
 * filters from which the user can select one or more.<p>
 *
 * When the user finishes his selection and hits <i>done</i>,
 * the filters are cloned and added to the FilterBank.
 *
 * @see Filter
 * @see FilterBank
 * @author Michael Shilman (michaels@eecs.berkeley.edu)
 * @version $Id$
 */
 
public class FilterPalette extends Frame {
	private static final int WIDTH = 150;
	private static final int HEIGHT = 300;
	
	Button m_done = new Button("Done");
	Button m_cancel = new Button("Cancel");
	List m_list = new List();
	Vector m_filters = new Vector();
	FilterBank m_bank = null;
	
	public FilterPalette() {
		setLayout(new GridLayout(3, 1));
		add(m_list);
		add(m_done);
		add(m_cancel);
	}
	
	public void show() {
		resize(WIDTH, HEIGHT);
		super.show();
	}

	/**
	 * Add another filter prototype to the palette.
	 */
	public void add(Filter f) {
		m_filters.addElement(f);
		m_list.addItem(f.getName());
	}
	
	public void setBank(FilterBank bank) {
		m_bank = bank;
	}
	
	public boolean action(Event evt, Object what) {
		if(evt.target == m_done) {
			int indices[] = m_list.getSelectedIndexes();
			for(int i = 0; i < indices.length; i++) {
				Filter f = (Filter)m_filters.elementAt(indices[i]);
				m_bank.add(f);
			}
			hide();
			return true;
		}
		else if(evt.target == m_cancel) {
			hide();
			return true;
		}
		else {
			return super.action(evt, what);
		}
	}
}