 java swing clear the event queue
By : vijayendra.ku.ratrey
Date : March 29 2020, 07:55 AM
it fixes the issue OK, I finally got everything to work. I am posting the SSCCE for a correctly working example. The trick is to hide the glasspane using "javax.swing.SwingUtilities.invokeLater()" method. Wrap the necessary code in a Runnable and then invoke it using invokeLater. In such a case, Swing processes all the mouse events (nothing happens since a glasspane intercepts them), and then hides the glasspane. Here is the SSCCE. code :
public class BusyCursorTest2 extends javax.swing.JFrame {
public BusyCursorTest2() {
javax.swing.JButton wait = new javax.swing.JButton("Wait 3 seconds");
getContentPane().setLayout(new java.awt.GridLayout(2, 1, 0, 0));
getContentPane().add(wait);
getContentPane().add(new javax.swing.JToggleButton("Click me"));
setTitle("Busy Cursor");
setSize(300, 200);
setDefaultCloseOperation(javax.swing.JFrame.DISPOSE_ON_CLOSE);
setVisible(true);
wait.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent event) {
final java.util.Timer timer = switchToBusyCursor(BusyCursorTest2.this);
try {
//do something expensive in EDT or otherwise
try {
Thread.sleep(3000);
} catch (InterruptedException e) {
//do nothing
}
} finally {
switchToNormalCursorEventThread(BusyCursorTest2.this, timer);
}
}
});
}
public static java.util.Timer switchToBusyCursor(final javax.swing.JFrame frame) {
startEventTrap(frame);
java.util.TimerTask timerTask = new java.util.TimerTask() {
public void run() {
startWaitCursor(frame);
}
};
final java.util.Timer timer = new java.util.Timer();
timer.schedule(timerTask, DELAY_MS);
return timer;
}
public static void switchToNormalCursorEventThread(final javax.swing.JFrame frame, final java.util.Timer timer) {
Runnable r = new Runnable() {
public void run() {
switchToNormalCursor(frame, timer);
}
};
javax.swing.SwingUtilities.invokeLater(r);
}
public static void switchToNormalCursor(final javax.swing.JFrame frame, final java.util.Timer timer) {
timer.cancel();
stopWaitCursor(frame);
stopEventTrap(frame);
}
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(java.awt.Cursor.getPredefinedCursor(java.awt.Cursor.DEFAULT_CURSOR));
frame.getGlassPane().removeMouseListener(mouseAdapter);
frame.getGlassPane().setVisible(false);
}
private static void startEventTrap(javax.swing.JFrame frame) {
frame.getGlassPane().addMouseListener(mouseAdapter);
frame.getGlassPane().setVisible(true);
}
private static void stopEventTrap(javax.swing.JFrame frame) {
java.awt.Toolkit.getDefaultToolkit().getSystemEventQueue();
frame.getGlassPane().removeMouseListener(mouseAdapter);
frame.getGlassPane().setVisible(false);
}
private static final java.awt.event.MouseAdapter mouseAdapter = new java.awt.event.MouseAdapter() {
};
public static void main(String[] args) {
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
new BusyCursorTest2();
}
});
}
private static final int DELAY_MS = 250;
}
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Date : March 29 2020, 07:55 AM
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By : noobbird
Date : March 29 2020, 07:55 AM
it helps some times For your specific example you can simply call AbstractButton#doClick.
If you need to create synthetic events for the general case, make sure fill in all fields that a real AWTEvent would have, since the event handlers may take them for granted.
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GWT: How to put event in queue (equivalent to Swing invokeLater())?
By : William Kasper
Date : March 29 2020, 07:55 AM
help you fix your problem Having the following szenario: blurring a textBox (input) writes text to my status-Box (in certain conditions), and clicking a button also writes text to the status-Box. , Try:
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By : frandarre
Date : March 29 2020, 07:55 AM
This might help you Good question, I'm also a advocate of using proper terminology.
Queue, message queue, and event queue are referring to the same construct (event loop queue). This construct has the callbacks which are fired in the event loop.
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code :
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