Graph Script Code

package ls.ui.msg;

import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JEditorPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;

import ls.util.msg.ErrorHandler;
import ls.util.msg.MessageHandler;
import ls.util.msg.MessageManager;

/**
 * A swing panel that can be used to display messages in a swing UI.
 * It's implemented as a message and error handler.
 * 
 * @author Lior
 * @see MessageHandler
 * @see ErrorHandler
 * @see MessageManager
 */
public class MessagePanel extends JPanel implements MessageHandler, ErrorHandler
{
	private static final long serialVersionUID = 1L;

	private JEditorPane editorPane = null;
	public MessagePanel()
	{
		super();
		initComponents();
//		MessageManager.registerErrorHandler(this);
//		MessageManager.registerMessageHandler(this);
	}
	/**
	 * Init the UI of the panel
	 */
	private void initComponents()
	{
		this.setLayout(new BorderLayout());
		editorPane = new JEditorPane();
		editorPane.setEditable(false);
		JScrollPane scrollPane = new JScrollPane(editorPane);
		this.add(scrollPane,BorderLayout.CENTER);
		
		JPanel buttonPanel = new JPanel();
		buttonPanel.setLayout(new FlowLayout(FlowLayout.TRAILING));
		JButton btn = new JButton("Clear");
		btn.addActionListener(
				new ActionListener()
				{
					public void actionPerformed(ActionEvent evt)
					{
						editorPane.setText("");
					}
				});
		buttonPanel.add(btn);
		
		this.add(buttonPanel,BorderLayout.SOUTH);
	}
	/**
	 * Append a line of text to the message area
	 * @param line The line to add, must not be null
	 */
	private void appendLine(String line)
	{
		if (line == null) return;
		String t = this.editorPane.getText();
		t += line + '\n';
		this.editorPane.setText(t);
		this.editorPane.scrollToReference(line);
	}
	
	public void handleError(String errMsg)
	{
		appendLine("ERROR: " + errMsg);
	}

	public boolean handleException(Exception exn)
	{
		handleError(exn.getMessage());
		return true;
	}

	public void handleMsg(String msg)
	{
		appendLine(msg);
	}

}