package graph.layer;
import graph.*;
import graph.filter.*;
import java.awt.*;

/**
 * A class for displaying layers
 *
 * XXX build gui
 *
 * @author Michael Shilman (michaels@eecs.berkeley.edu)
 * @version $Id$
 */
public class LayerFilter implements Filter {
	public static int s_layerIndex = AttributeManager.NO_INDEX;
	
	public LayerFilter() {
        if(s_layerIndex == AttributeManager.NO_INDEX) {
        	s_layerIndex = AttributeManager.getIndex("Layer");
        }
	}
	
	/**
	 * Apply this filter to the node, modifying its
	 * "show" display field.
	 */
	public void apply(Node n) {
        LayerInfo info = (LayerInfo)n.getAttr(s_layerIndex);
		
		boolean show = true;//LayerMgr.getShow(info.layer);
		
		n.rep.show = show;
		for(int i = 0; i < n.in.size(); i++) {
			((Edge)n.in.elementAt(i)).rep.show = show;
		}
		for(int i = 0; i < n.out.size(); i++) {
			((Edge)n.out.elementAt(i)).rep.show = show;
		}
	}
		
	
	public String getName() { return "Layer"; }
	
	public Component buildThumbnail() {
		return new Button("Layers");
	}
	
	/**
	 * Build a dialog by which the user can easily
	 * configure parameters to the Filter.
	 */
	public Frame buildGUI() {
		return new Frame("Layer Filter");
	}
}