Mouse Cursor Not Changing

[michael byrd]

I have the following:

panel = new JPanel(new BorderLayout());
tb = createToolBar();
p2 = new JPanel();
panel.add(tb, BorderLayout.NORTH);
panel.add(p2, BorderLayout.CENTER);



when a button is clicked in the toolbar i try to change the parents panel mouse cursor to the HAND_CURSOR.


//inside the toolbar class when a button is clicked
getParent().setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));



...well the cursor is not changing. I know that when you set the cursor for a Container that all subcomponents will get that cursor if their cursor is null...otherwise it wont. So i recursively printed out the children components of the parent, as well as their comp.getCursor() and they all have the HAND_CURSOR...which is expected since I had just set it.

I also tried, recursively setting the cursor for the parent and all children to null

comp.setCursor(null);



...as i recursively set the cursor to null I printed out the result of comp.getCursor(). Sure enough it was always "java.awt.Cursor[Default Cursor]". So, according to the Component.setCursor documentation the cursor wont change for anything in the Container...since its subcomponents have non-null cursors.

Any ideas why it doesnt show up? or how to do it??

[Craig Wood]

//inside the toolbar class when a button is clicked
getParent().setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));
toolbar class?
I would look to see/verify who is returned by the getParent call
System.out.println(getParent().getClass().getName());

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
 
public class CursorTest
{
    JPanel panel;
 
    private JToolBar getToolBar()
    {
        JToolBar toolBar = new JToolBar();
        toolBar.add(cursorSwap);
        return toolBar;
    }
 
    private JPanel getPanel()
    {
        JLabel label = new JLabel("this is a label", JLabel.CENTER);
        label.setBorder(BorderFactory.createEtchedBorder());
        panel = new JPanel(new GridBagLayout());
        panel.setBackground(Color.pink);
        GridBagConstraints gbc = new GridBagConstraints();
        gbc.weighty = 1.0;
        gbc.gridwidth = gbc.REMAINDER;
        panel.add(new JButton("button"), gbc);
        panel.add(label, gbc);
        return panel;
    }
 
    private Action cursorSwap = new AbstractAction("change cursor")
    {
        public void actionPerformed(ActionEvent e)
        {
            int type = panel.getCursor().getType();
            Cursor cursor;
            if(type == Cursor.DEFAULT_CURSOR)
                cursor = Cursor.getPredefinedCursor(Cursor.HAND_CURSOR);
            else
                cursor = Cursor.getDefaultCursor();
            panel.setCursor(cursor);
        }
    };
 
    public static void main(String[] args)
    {
        CursorTest test = new CursorTest();
        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.getContentPane().add(test.getToolBar(), "North");
        f.getContentPane().add(test.getPanel());
        f.setSize(400,300);
        f.setLocation(200,200);
        f.setVisible(true);
    }
}