我在应用程序中显示等待光标时遇到问题。只要鼠标位于定义其自身光标的面板上方，等待光标就不会出现。如果面板不改变光标，则会出现等待光标。
我附上 SSCE 来准确解释我的问题。
public class BusyCursorTest extends javax.swing.JFrame {
public BusyCursorTest() {
javax.swing.JMenuBar menuBar = new javax.swing.JMenuBar();
javax.swing.JMenu menu = new javax.swing.JMenu("Menu");
javax.swing.JMenuItem wait1 = new javax.swing.JMenuItem("Wait 100 ms");
javax.swing.JMenuItem wait2 = new javax.swing.JMenuItem("Wait 250 ms");
javax.swing.JMenuItem wait3 = new javax.swing.JMenuItem("Wait 500 ms");
javax.swing.JMenuItem wait4 = new javax.swing.JMenuItem("Wait 1000 ms");
menu.add(wait1);
menu.add(wait2);
menu.add(wait3);
menu.add(wait4);
menuBar.add(menu);
setJMenuBar(menuBar);
wait1.addActionListener(getActionListener(this, delayActionListener(100)));
wait2.addActionListener(getActionListener(this, delayActionListener(250)));
wait3.addActionListener(getActionListener(this, delayActionListener(500)));
wait4.addActionListener(getActionListener(this, delayActionListener(1000)));
cursorPanel = new javax.swing.JPanel();
cursorPanel.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseEntered(java.awt.event.MouseEvent e) {
cursorPanel.setCursor(java.awt.Cursor.getPredefinedCursor(java.awt.Cursor.CROSSHAIR_CURSOR));
}
public void mouseExited(java.awt.event.MouseEvent e) {
cursorPanel.setCursor(java.awt.Cursor.getPredefinedCursor(java.awt.Cursor.DEFAULT_CURSOR));
}
});
javax.swing.JTabbedPane tabbedPane = new javax.swing.JTabbedPane();
tabbedPane.addTab("Default", new javax.swing.JPanel());
tabbedPane.addTab("Cursor change", cursorPanel);
getContentPane().add(tabbedPane);
setTitle("Cursor test");
setSize(400, 400);
setDefaultCloseOperation(javax.swing.JFrame.DISPOSE_ON_CLOSE);
setVisible(true);
}
private java.awt.event.ActionListener delayActionListener(final int delay) {
java.awt.event.ActionListener listener = new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent ae) {
try {
Thread.sleep(delay);
} catch (InterruptedException e) {
}
}
};
return listener;
}
public static void main(String[] args) {
new BusyCursorTest();
}
public static java.awt.event.ActionListener getActionListener(final java.awt.Component component,
final java.awt.event.ActionListener originalActionListener) {
java.awt.event.ActionListener actionListener = new java.awt.event.ActionListener() {
public void actionPerformed(final java.awt.event.ActionEvent e) {
java.util.TimerTask timerTask = new java.util.TimerTask() {
public void run() {
originalCursor = component.getCursor();
component.setCursor(java.awt.Cursor.getPredefinedCursor(java.awt.Cursor.WAIT_CURSOR));
}
};
java.util.Timer timer = new java.util.Timer();
try {
timer.schedule(timerTask, DELAY_MS);
originalActionListener.actionPerformed(e);
} finally {
timer.cancel();
component.setCursor(originalCursor);
}
}
};
return actionListener;
}
private javax.swing.JPanel cursorPanel = null;
public static java.awt.Cursor originalCursor = null;
public static final int DELAY_MS = 250;
}
运行附加的 SSCE。
当选择第一个选项卡（“默认”）时，单击 1000ms 菜单项将显示忙碌光标。
当选择第二个选项卡（“光标更改”）时，单击 1000ms 菜单项不会显示忙碌光标。
我应该如何解决这个问题？
我强烈希望我的代码不必考虑任何面板，因为对我来说跟踪哪些面板可能位于最前面是非常困难的。此外，事件并不总是由于鼠标单击而生成。
建议的解决方法是什么，以便我可以修改顶级容器的行为？
在网上搜索后，我找到了我的问题的答案。
关键是将光标设置在包含要显示繁忙光标的组件的框架的玻璃板上。我从网上的以下文章中得到了这个想法。
等等，光标，等等！ http://www.javaspecialists.eu/archive/Issue065.html
自动等待游标：WaitCursor EventQueue http://www.javaspecialists.eu/archive/Issue075.html
我修改了 SSCE，使其适用于框架内的组件设置自己的光标的情况。这是修改后的 SSCE。
public class BusyCursorTest extends javax.swing.JFrame {
private javax.swing.JPanel cursorPanel = null;
public BusyCursorTest() {
javax.swing.JMenuBar menuBar = new javax.swing.JMenuBar();
javax.swing.JMenu menu = new javax.swing.JMenu("Menu");
javax.swing.JMenuItem wait1 = new javax.swing.JMenuItem("Wait 100 ms");
javax.swing.JMenuItem wait2 = new javax.swing.JMenuItem("Wait 250 ms");
javax.swing.JMenuItem wait3 = new javax.swing.JMenuItem("Wait 500 ms");
javax.swing.JMenuItem wait4 = new javax.swing.JMenuItem("Wait 1000 ms");
menu.add(wait1);
menu.add(wait2);
menu.add(wait3);
menu.add(wait4);
menuBar.add(menu);
setJMenuBar(menuBar);
wait1.addActionListener(getActionListener(this, delayActionListener(100)));
wait2.addActionListener(getActionListener(this, delayActionListener(250)));
wait3.addActionListener(getActionListener(this, delayActionListener(500)));
wait4.addActionListener(getActionListener(this, delayActionListener(1000)));
cursorPanel = new javax.swing.JPanel();
cursorPanel.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseEntered(java.awt.event.MouseEvent e) {
cursorPanel.setCursor(java.awt.Cursor.getPredefinedCursor(java.awt.Cursor.CROSSHAIR_CURSOR));
}
public void mouseExited(java.awt.event.MouseEvent e) {
cursorPanel.setCursor(java.awt.Cursor.getPredefinedCursor(java.awt.Cursor.DEFAULT_CURSOR));
}
});
javax.swing.JTabbedPane tabbedPane = new javax.swing.JTabbedPane();
tabbedPane.addTab("Default", new javax.swing.JPanel());
tabbedPane.addTab("Cursor change", cursorPanel);
getContentPane().add(tabbedPane);
setTitle("Cursor test");
setSize(400, 400);
setDefaultCloseOperation(javax.swing.JFrame.DISPOSE_ON_CLOSE);
setVisible(true);
}
private java.awt.event.ActionListener delayActionListener(final int delay) {
java.awt.event.ActionListener listener = new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent ae) {
try {
Thread.sleep(delay);
} catch (InterruptedException e) {
}
}
};
return listener;
}
public static void main(String[] args) {
new BusyCursorTest();
}
public static java.awt.event.ActionListener getActionListener(final javax.swing.JFrame frame,
final java.awt.event.ActionListener originalActionListener) {
java.awt.event.ActionListener actionListener = new java.awt.event.ActionListener() {
public void actionPerformed(final java.awt.event.ActionEvent e) {
java.util.TimerTask timerTask = new java.util.TimerTask() {
public void run() {
originalCursor = frame.getCursor();
startWaitCursor(frame);
}
};
java.util.Timer timer = new java.util.Timer();
try {
timer.schedule(timerTask, DELAY_MS);
originalActionListener.actionPerformed(e);
} finally {
timer.cancel();
stopWaitCursor(frame);
}
}
};
return actionListener;
}
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);
}
private static java.awt.Cursor originalCursor = null;
private static final java.awt.event.MouseAdapter mouseAdapter = new java.awt.event.MouseAdapter() {
};
public static final int DELAY_MS = 250;
}
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