bangbean.java

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//: BangBean.java
// A graphical Bean
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.util.*;

public class BangBean extends Canvas
	implements Serializable {
	protected int xm, ym;
	protected int cSize = 20; // Circle size
	protected String text = "Bang!";
	protected int fontSize = 48;
	protected Color tColor = Color.red;
	protected ActionListener actionListener;

	public BangBean() {
		addMouseListener(new ML());
		addMouseMotionListener(new MML());
	}

	public int getCircleSize() { return cSize; }

	public void setCircleSize(int newSize) {
		cSize = newSize;
	}
	
	public String getBangText() { return text; }
	
	public void setBangText(String newText) {
		text = newText;
	}

	public int getFontSize() { return fontSize; }

	public void setFontSize(int newSize) {
		fontSize = newSize;
	}
	
	public Color getTextColor() { return tColor; }
	
	public void setTextColor(Color newColor) {
		tColor = newColor;
	}

	public void paint(Graphics g) {
		g.setColor(Color.black);
		g.drawOval(xm - cSize/2, ym - cSize/2,
		cSize, cSize);
	}

	// This is a unicast listener, which is
	// the simplest form of listener management:
	public void addActionListener (
			ActionListener l)
			throws TooManyListenersException {
		if(actionListener != null)
		throw new TooManyListenersException();
		actionListener = l;
	}

	public void removeActionListener(
			ActionListener l) {
		actionListener = null;
	}

	class ML extends MouseAdapter {
		public void mousePressed(MouseEvent e) {
			Graphics g = getGraphics();
			g.setColor(tColor);
			g.setFont(new Font(
				"TimesRoman", Font.BOLD, fontSize));
			int width =
				g.getFontMetrics().stringWidth(text);
			g.drawString(text,
				(getSize().width - width) /2,
				getSize().height/2);
			g.dispose();
			// Call the listener's method:
			if(actionListener != null)
				actionListener.actionPerformed(
				new ActionEvent(BangBean.this,
				ActionEvent.ACTION_PERFORMED, null));
		}
	}

	class MML extends MouseMotionAdapter {
		public void mouseMoved(MouseEvent e) {
			xm = e.getX();
			ym = e.getY();
			repaint();
		}
	}

	public Dimension getPreferredSize() {
		return new Dimension(200, 200);
	}

	// Testing the BangBean:
	public static void main(String[] args) {
		BangBean bb = new BangBean();
		try {
			bb.addActionListener(new BBL());
		} catch(TooManyListenersException e) {}
		Frame aFrame = new Frame("BangBean Test");
		aFrame.addWindowListener(
			new WindowAdapter() {
				public void windowClosing(WindowEvent e) {
					System.exit(0);
				}
			});
		aFrame.add(bb, BorderLayout.CENTER);
		aFrame.setSize(300,300);
		aFrame.setVisible(true);
	}

	// During testing, send action information
	// to the console:
	static class BBL implements ActionListener {
		public void actionPerformed(ActionEvent e) {
			System.out.println("BangBean action");
		}
	}
} ///:~