java等待光标显示问题 [英] java wait cursor display problem
问题描述
我在应用程序中显示等待光标时遇到问题。只要鼠标位于定义自己光标的面板上方，就不会出现等待光标。如果面板没有更改光标，则会出现等待光标。
I am having issues displaying a wait cursor in my application. Whenever the mouse is above a panel that defines its own cursor, the wait cursor does not appear. If a panel does not change the cursor, the wait cursor appears.
我附加一个SSCE来准确解释我的问题。
I am attaching a SSCE to accurately explain my problem.
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。
When the first tab ("Default") is selected, clicking on the 1000ms menu item will show the busy cursor.
当第二个选项卡（Cursor选择更改），单击1000ms菜单项不显示忙碌光标。
When the second tab ("Cursor change") is selected, clicking on the 1000ms menu item does not show the busy cursor.
我该如何解决这个问题？
How should I remedy this problem?
我强烈希望我的代码不必考虑任何面板，因为我很难跟踪哪些面板可能处于最前沿。此外，由于鼠标单击，并不总是生成事件。
I would strongly prefer that my code do not have to take into account any of the panels, as it is immensely difficult for me keep track of which panels may be at the forefront. Also, the events are not always generated due to a mouse click.
建议的解决方法是什么，以便我可以修改顶级容器的行为？
What is the recommended workaround so that I can modify the behavior at the top-level container?
推荐答案
在搜索互联网后，我找到了问题的答案。
After searching the internet, I found the answer to my question.
关键是将光标设置在包含要显示忙碌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。
The key is to set the cursor on the glasspane of the frame that contains the component which wants to display a busy cursor. I got the idea from the following articles on the net.
我修改了我的SSCE，使其适用于框架内的组件设置自己的情况光标。这是修改后的SSCE。
I modified my SSCE to make it work for the case when components inside the frame set their own cursor. Here is the modified 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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