Why Doesn\'t My Java Wait Cursor Show When Using a Custom Cursor?

Java Wait Cursor Display Problem

Issue Outline

In a Java application, the wait cursor is not displaying properly when the mouse hovers over a panel with a custom cursor. When the panel does not change the cursor, the wait cursor appears as expected.

Analysis

The primary issue stems from the fact that the wait cursor is set on the component where the mouse event originates. In this case, when the mouse is over a panel with a custom cursor, the wait cursor is set on that panel and is thus hidden by the panel's cursor.

Recommended Workaround

To circumvent this issue and ensure the wait cursor displays correctly, it is recommended to set the wait cursor on the glasspane of the frame containing the component that triggers the wait state. The glasspane is a transparent layer that sits on top of all other components in the frame.

Implementation

Modified SSCE:

The following modified SSCE demonstrates how to implement the fix by setting the wait cursor on the glasspane:

public class BusyCursorTest extends javax.swing.JFrame {

    // ...

    private static void startWaitCursor(javax.swing.JFrame frame) {
        frame.getGlassPane().setCursor(java.awt.Cursor.getPredefinedCursor(java.awt.Cursor.WAIT_CURSOR));
        frame.getGlassPane().addMouseListener(mouseAdapter);
        frame.getGlassPane().setVisible(true);
    }

    private static void stopWaitCursor(javax.swing.JFrame frame) {
        frame.getGlassPane().setCursor(originalCursor);
        frame.getGlassPane().removeMouseListener(mouseAdapter);
        frame.getGlassPane().setVisible(false);
    }

    // ...

}

Advantages of this Approach:

• This approach ensures that the wait cursor is always visible when needed, regardless of the cursor settings of any component within the frame.
• It eliminates the need to track which panels may be at the forefront or whether the event is triggered by a mouse click.
• It provides a centralized solution for modifying the wait cursor behavior at the top-level container level.

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