Why Doesn\'t My Java Wait Cursor Appear When a Panel Sets Its Own Cursor?

Java Wait Cursor Display Problem

In this Java application, the wait cursor does not appear when the mouse hovers over a panel that defines its own cursor. Here's a breakdown of the issue:

Problem:

• When a panel changes its cursor, the wait cursor set at the top-level container does not appear.

Root Cause:

• The wait cursor set on the JPanel overrides the wait cursor set on the frame's glass pane.

Solution:

• Set the wait cursor on the glass pane of the frame containing the components that wish to display the wait cursor.

Modified SSCE:

public class BusyCursorTest extends javax.swing.JFrame {

    private javax.swing.JPanel cursorPanel = null;

    public BusyCursorTest() {
        // ...
        // Set the wait cursor on the glass pane
        startWaitCursor(this);
        // ...
    }

    private static void startWaitCursor(javax.swing.JFrame frame) {
        frame.getGlassPane().setCursor(java.awt.Cursor.getPredefinedCursor(java.awt.Cursor.WAIT_CURSOR));
        // Add mouse listener to glass pane for handling cursor visibility
        frame.getGlassPane().addMouseListener(mouseAdapter);
        frame.getGlassPane().setVisible(true);
    }

    // ...

    private static java.awt.event.MouseAdapter mouseAdapter = new java.awt.event.MouseAdapter() {
    };
}

Additional Notes:

• This solution works independently of any panels and does not require tracking cursor changes in multiple panels.
• The wait cursor is started using a timer to ensure it displays after an intentional delay (in this case, 250ms), giving time for the UI to become responsive.
• The originalCursor variable is used to restore the original cursor when the wait cursor is removed.

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