Mouse Events Not Registering

[Greedy thomas]

Hello There

I'm trying to draw lines on a drawing panel using the mouse to press, drag and release to draw a line. I also need to add functionality to allow the user to change the color of the line. I've just started on this and somehow I cannot get the mouse events to register.

I've enclosed the code below. Could someone please tell me what I'm missing.

Please help me figure out my problem. Why are the mouse clicks not being registered.

Thanks in advance,
Rajesh.

import java.awt.* ;
import java.awt.event.* ;
import javax.swing.* ;
 
public class testLineDraw extends JFrame {
 
Container contPane ;

public testLineDraw (String titleText) {
super(titleText) ;
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE) ;
DrawingPanel drawPanel = new DrawingPanel() ;
contPane = this.getContentPane() ;
contPane.add(drawPanel,BorderLayout.CENTER) ;
setSize(300,300) ;
setVisible(true) ;
setResizable(false) ;
setLocationRelativeTo(null) ;
 
addMouseListener(new MouseAdapter() {
public void MousePressed(MouseEvent me) {
JOptionPane.showMessageDialog(null,"In MousePressed Event", "Information", JOptionPane.INFORMATION_MESSAGE) ;
System.out.println("X point = " + me.getX() + " Y Point = " + me.getY()) ;
Point startPt = me.getPoint() ;
}
}
) ;
 
addMouseMotionListener(new MouseMotionAdapter() {
public void MouseDragged(MouseEvent me) {
JOptionPane.showMessageDialog(null,"In MouseDragged Event", "Information", JOptionPane.INFORMATION_MESSAGE) ;
System.out.println("X point = " + me.getX() + " Y Point = " + me.getY()) ;
Point startPt = me.getPoint() ;
}
}
) ;
 
}
 
public class DrawingPanel extends JPanel {
public DrawingPanel() {
setBackground(Color.WHITE) ;
setBorder(BorderFactory.createTitledBorder("Drawing Panel")) ;
}

public void paintComponent(Graphics grafx) {
super.paintComponent(grafx) ;
grafx.drawLine(50,50,100,200) ;
}
}

public static void main (String[] args) {
new testLineDraw("Line Drawing using Mouse") ;
}
 
}

[Steve JK]

Hi,

I dont have the time to properly test this and give you a definite answer right now,

But I suspect it is because you havent actually assigned the Mouse Listener to the Drawing Panel.

Try something like this: drawPanel.addMouseListener(new MouseAdapter....

Assigning the Mouse Listener to the drawing panel should then detect mouse events that occur on the drawing panel.

Sorry havent time to produce complete code for you, but try the above and let me know if it works or not.?

Cheers,
Steve

[Dirk Schreckmann]

Moving this to the Swing / JFC / AWT forum...

[Greedy thomas]

Thanks Steve for the suggestion.

I did try what you had suggested but I'm still having the same problem. It's still not picking up the mouse events.

Any suggestions, anyone.

Regards,
Rajesh

[Darin Niard]

It's because your methods are named MousePressed() and
MouseDragged() instead of mousePressed() and mouseDragged()

[ June 23, 2004: Message edited by: Darin Niard ]
[ June 23, 2004: Message edited by: Gregg Bolinger ]

[Greedy thomas]

Thanks Darin Niard

That worked.

Regards,
Rajesh