Name: rm29839 Date: 02/20/98


I am unable to set the cursor for a JPanel when it's added to the
content pane of a JFrame. No problem setting the cursor for JFrame's or
other Swing components, just this one particular case. I'm using Swing
0.7 with JDK 1.2beta2. Here's a repro case:

/* CursorBug.java
 */
import java.awt.*;
import java.awt.event.*;
import com.sun.java.swing.*;

public class CursorBug {

    // Main entry point
    public static void main(String s[]) {
        // Create app panel
        CursorBugPanel panel = new CursorBugPanel();

        // Create a frame for app
        JFrame frame = new JFrame("CursorBug");
        frame.setBackground(Color.blue);
// Sets cursor for frame, no problem
// frame.setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));

//
        // Add a window listener for window close events
        frame.addWindowListener(new WindowAdapter() {
             public void windowClosing(WindowEvent e) {System.exit(0);}
        });

        // Add app panel to content pane
        frame.getContentPane().add(panel);

        // Set initial frame size and make visible
        frame.setSize (300, 300);
        frame.setVisible(true);
    }
}

class CursorBugPanel extends JPanel {
    // Constructor
    public CursorBugPanel () {

// BUG: fails to set cursor for panel
        setCursor(Cursor.getPredefinedCursor(Cursor.MOVE_CURSOR));
//
        // Create a quit button
        JButton button = new JButton("Quit");
        button.addActionListener (new ActionListener () {
            public void actionPerformed (ActionEvent e) {
                System.exit (0);
            }
        });
// Sets cursor for button, no problemmyjava

button.setCursor(Cursor.getPredefinedCursor(Cursor.CROSSHAIR_CURSOR));
//
        add(button);
    }
}
(Review ID: 25216)
======================================================================

Another test case - Cursors work with Panels but not with JPanels.
brian.klock@eng 1998-07-31

//------------------------------CursorBug2.java-----------------------------
import java.awt.*;
import com.sun.java.swing.*;

public class CursorBug2
{
    static public void main(String args[])
    {
        JFrame frame1 = new JFrame("Crosshair Cursor shows up with a Panel");
        frame1.setSize(500, 200);
        frame1.setLocation(50, 20);
 
        JButton button = new JButton("PressMe");
        button.setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));

        Panel panel = new Panel();
        panel.setBackground(Color.blue);
        panel.setCursor(Cursor.getPredefinedCursor(Cursor.CROSSHAIR_CURSOR));
        panel.add(button);

        frame1.getContentPane().add("Center", panel);
        frame1.setVisible(true);


        JFrame frame2 = new JFrame("But not with a JPanel");
        frame2.setSize(500, 200);
        frame2.setLocation(600, 20);
 
        JButton button2 = new JButton("PressMe");
        button2.setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));

        JPanel panel2 = new JPanel();
        panel2.setBackground(Color.blue);
        panel2.setCursor(Cursor.getPredefinedCursor(Cursor.CROSSHAIR_CURSOR));
        panel2.add(button2);

        frame2.getContentPane().add("Center", panel2);
        frame2.setVisible(true);
    }
}

====================================================================

This next test case shows that just a plain vanilla JComponent can't have Cursors either, while JButtons can. The left side component (a JComponent) should have the MOVE Cursor.


//--------------------------CursorBug3.java-------------------------------
import java.awt.*;
import com.sun.java.swing.*;
import com.sun.java.swing.border.*;

public class CursorBug3
{
    static public void main(String args[])
    {
        JFrame frame = new JFrame();
        frame.setSize( new Dimension( 200, 200));
  
        JSplitPane j = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT);
        ExtJComponent pane = new ExtJComponent();

        JButton button1 = new JButton("PressMe");
        button1.setCursor(Cursor.getPredefinedCursor(Cursor.CROSSHAIR_CURSOR));

        j.setLeftComponent(pane);

        j.setRightComponent(button1);
        j.setContinuousLayout(true);
        frame.getContentPane().add("Center", j);
        //frame.getContentPane().add("East", pane);
        frame.setVisible(true);
        pane.setCursor(Cursor.getPredefinedCursor(Cursor.MOVE_CURSOR));
        frame.setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
        System.out.println(pane.getSize());
    }
}

class ExtJComponent extends JComponent {
    public ExtJComponent() {
        super();
        setOpaque(true);
        setBackground(Color.green);
        setForeground(Color.red);
        setBorder(new BevelBorder(BevelBorder.RAISED));
    }
    public void paintComponent(Graphics g) {
        g.drawString("Hello World", 20, 30);
    }
    public Dimension getPreferredSize() {
        return new Dimension(100,100);
    }
}