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.
The above is the detailed content of Why Doesn\'t My Java Wait Cursor Appear When a Panel Sets Its Own Cursor?. For more information, please follow other related articles on the PHP Chinese website!

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