Name: diC59631			Date: 09/22/97


Using the app below, move the mouse onto the black bar. Press the button, and QUICKLY move the mouse to left or 
right. Notice that the Draggable receives a MOUSE_PRESSED event, then a MOUSE_EXITED event, but no 
MOUSE_DRAGGED events.

Here is some typical console output for such a situation ...

mousePressed java.awt.event.MouseEvent[MOUSE_PRESSED,(198,29),mods=16,clickCount
=1] on panel1
setCursor(java.awt.Cursor@1eee04)
mouseExited java.awt.event.MouseEvent[MOUSE_EXITED,(233,27),mods=0,clickCount=0]
 on panel1

Here is the source code ...

import java.awt.*;
import java.awt.event.*;

public class test extends Frame {
	Draggable d;
	Button b1, b2;

	public static void main(String[] args) {
		new test();
	}

	test() {
		super("Test Mouse dragging");
		Panel p = new Panel();
		d = new Draggable();
		d.setLayout(null);
		d.add(b1 = new Button("Button 1"));
		d.add(b2 = new Button("Button 2"));
		p.add(d);
		add(p);
		show();
		b1.setBounds(0, 0, 50, 100);
		b2.setBounds(55, 0, 445, 100);
		setSize(500, 100);
		d.setBackground(Color.white);
		d.setForeground(Color.black);
	}
}

class Draggable extends Panel implements MouseListener, MouseMotionListener {
	boolean dragging;
	int x, y;
	Rectangle dragArea = new Rectangle(50, 0, 5, 100);
	Cursor currentCursor, originalCursor;

	public Draggable() {
		addMouseListener(this);
		addMouseMotionListener(this);
	}

	public Dimension preferredSize() {
		return new Dimension(500, 100);
	}

	public Dimension minimumSize() {
		return preferredSize();
	}

	/** Change the mouse cursor if over a draggable border. */
	public void mouseMoved(MouseEvent e) {
		System.out.println("mouseMoved " + e);
		if(!dragging) {
			if(dragArea.contains(e.getX(), e.getY()))
				cursor(Cursor.getPredefinedCursor(Cursor.MOVE_CURSOR));
			else
				cursor(null);
		}
	}

	/** Select a border to drag. */
	public void mousePressed(MouseEvent e) {
		System.out.println("mousePressed " + e);
		dragging = true;
		cursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));
		x = e.getX();
		y = e.getY();
	}

	/** Stop dragging a border. */
	public void mouseReleased(MouseEvent e) {
		System.out.println("mouseReleased " + e);
		if(dragging) {
			dragging = false;
			mouseMoved(e);
		}
	}

	public void mouseClicked(MouseEvent e) {
		System.out.println("mouseClicked " + e);
	}

	public void mouseEntered(MouseEvent e) {
		System.out.println("mouseEntered " + e);
	}

	public void mouseExited(MouseEvent e) {
		System.out.println("mouseExited " + e);
		if(!dragging)
			cursor(null);
	}
	
	/** If a border is selected, change it's position. */
	public void mouseDragged(MouseEvent e) {
		if(e.getX() != x) {
			x = e.getX();
			System.out.println("mouseDragged " + e);
			if (dragging) {
				System.out.println("Moved to " + e.getX() + "," + e.getY());
				dragArea.x = x;
				getComponent(0).setSize(x, 100);
				getComponent(1).setBounds(x + 5, 0, 495 - x, 100);
				repaint();
			}
		}
	}

	private void cursor(Cursor newcursor) {
		System.out.println("setCursor(" + newcursor + ")");
		if(newcursor != null) {
			// Want to set cursor to new shape
			if(originalCursor == null)	// Save original shape
				originalCursor = getCursor();
			setCursor(newcursor);
		} else if(originalCursor != null) {
			setCursor(originalCursor);
			originalCursor = null;
		}
		currentCursor = newcursor;
	}

	public void paint(Graphics g) {
		super.paint(g);
		g.fillRect(dragArea.x, dragArea.y, dragArea.width, dragArea.height);
	}

}
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