/* 
a window with a canvas in which connected nodes can be viewed and positioned
author: p gray
date:	21 june 98
*/

import java.awt.*;
import java.applet.*;

// class which handles graf viewing
public class VisualGraph extends Applet	{
	GrafView grafView;
	String mode = "";
	
	// constructor
	public void init()	{
		setLayout(new BorderLayout());
		// install graf view
		grafView = new GrafView();
		grafView.setBackground(Color.white);
		add("Center", grafView);
		// install button panel
		add("West", new EditButtonPanel(this));
	}
		
	public Insets getInsets()	{
		return new Insets(10,10,10,10);
	}
	
	//public void paint(Graphics g)
	
	public void setMode(String s)	{
		grafView.setMode(s);
	}
}

	
// utility classes

class EditButtonPanel extends Panel	{
	Button buttonList[] = new Button[3];
	VisualGraph vga;
	
	public EditButtonPanel(VisualGraph vga)	{
		this.vga = vga;
		setBackground(Color.lightGray);
		Button newNodeButton = new Button("Add Node");
		newNodeButton.setBackground(Color.gray);
		Button newLinkButton = new Button("Add Link");
		newLinkButton.setBackground(Color.gray);
		Button deleteNodeButton = new Button("Delete Node");
		deleteNodeButton.setBackground(Color.gray);
		setLayout(new GridLayout(3,1));
		buttonList[0] = (Button) add(newNodeButton);
		buttonList[1] = (Button) add(newLinkButton);
		buttonList[2] = (Button) add(deleteNodeButton);
	}
	
	public boolean action(Event event, Object arg)	{
		if (event.target instanceof Button)	{
			if (arg.equals("Add Node"))	{
				System.out.println("New Node button pressed.");
				vga.setMode("Add Node");
			}
			else if (arg.equals("Add Link"))	{
				System.out.println("New Link button pressed.");
				vga.setMode("Add Link");
			} else	{
				System.out.println("Delete Node button pressed.");
				vga.setMode("Delete Node");
			}
		}
		return(true);
	}
	

}