I have a JDialog in my java code, I want to get the indication when the user closes the JDialog, Is there any way in java to get indication when user closes the JDialog???
Simply add a WindowListener to it and override the windowClosing() or windowClosed() methods.
WindowListener.windowClosing() is called when the user attempts to close the window, WindowListener.windowClosed() is called when the window has been closed.
Example:
dialog.addWindowListener(new WindowAdapter() {
#Override
public void windowClosing(WindowEvent e) {
System.out.println("User attempted to close the dialog!");
}
});
For a modal dialog, then the code after the call that shows the dialog will not continue until the dialog is closed. I.e.,
JDialog dialog = new JDialog((Frame)null, true); // true = modal
System.out.println("before");
dialog.setVisible();
System.out.println("after"); // <-- won't happen until the dialog is closed
For a non-modal dialog, call dialog.addWindowListener as you would with any other window, with a WindowListener (or WindowAdapter) and override either windowClosing or windowClosed, depending on whether you need to prevent closure or merely detect it.
For best control this I suggest to You to create your own class of dialog that extends Jdialog and then to overwrite the functions setVisible(boolen value) and dispose() . By default when user click close button dialog goes to funciton setVisible(false) but you can change this using setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE). Here is a simple code.
public class MyDialog extends JDialog {
public MyDialog(){
super();
this.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
setSize(new Dimension(200,200));
setVisible(true);
}
public void dispose(){
System.out.println("dialog disposed");
// put your code here
super.dispose();
}
public void setVisible(boolean value) {
System.out.println("dialog set visible : " + value);
// or put your code here
super.setVisible(value);
}
}
I am make a project on cars. How can I make distributor frame popup and cars frame not visible and close automatic? Kindly send any solution in simple and effective way.
I have done coding this way:-
{
Cars frm1=new Cars();
Distributor frm2=new Distributor();
frm2.setVisible(true);
frm1.setVisible(false);
frm1.setDefaultCloseOperation(frm1.DISPOSE_ON_CLOSE);
}
".Please help me to how I can make distributor frame popup and cars frame is not visible and close automatic."
Ok so in Netbeans GUI Builder, you may want to do the following (this is assuming you have created two separate JFrame form files
In the frame that is the launching program (we'll call it MyFrame1) add a button to it (we'll call it jButton1)
Add a listener to the button, then the following code should be auto-generated
public void jButton1ActionPerforemd(javax.swing.ActionEvent evt) {
}
In that actionPerformed, just instantiate the second frame (we'll call it MyFrame2) and setVisible(false) to MyFrame1. MyFrame2 should already be visible upon instantiation, so you wouldn't have to setVisisble(true) on it
public void jButton1ActionPerforemd(javax.swing.ActionEvent evt) {
MyFrame2 frame2 = new MyFrame2();
MyFrame1.this.setVisible(false);
// You can also use MyFrame1.this.dispose(); dependind if you ever need to use that frame again
}
I think this should work
you need to setVisible Jframe2 as true...so it can apear on output sceen
public void jButton1ActionPerforemd(javax.swing.ActionEvent evt)
{
myFrame2 frame2=new myframe2();
myframe1.this.setVisible(false);
frame2.setVisible(true);
}
create action event for the button such that when when you click will take
you
to the next page for my case next page is nextjFrame
private void nextButtonActionPerformed(java.awt.event.ActionEvent evt) {
setVisible(false);
nextjFrame ob=new nextjFrame();
ob.setVisible(true);
}
private void BTNConvertActionPerformed(java.awt.event.ActionEvent evt) {
/*
This is the action performed event for my Button "BTNConvert"
*/
java.awt.EventQueue.invokeLater
(new Runnable()
{
public void run()
{
new JFrame2().setVisible(true);
}
});
/*
This will set the second Frame Visible.
*/
JFrame1.this.setVisible(false);
/*
This should set the first frame invisible or whatever. Any other code should be
written before the curly brace below.
*/
}
//You're Welcome.
I am developing a tool for my laptop. I want to disable minimize button in the JFrame. I have already disabled maximize and close button.
Here is the code to disable maximize and close button:
JFrame frame = new JFrame();
frame.setResizable(false); //Disable the Resize Button
// Disable the Close button
frame.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
Please, tell me how to disable minimize button.
Generally, you can't, what you can do is use a JDialog instead of JFrame
As #MadProgrammer said (+1 to him), this is definitely not a good idea you'd rather want to
use a JDialog and call setDefaultCloseOperation(JDialog.DO_NOTHING_ON_CLOSE); to make sure it cannot be closed.
You could also use a JWindow (+1 to #M. M.) or call setUndecorated(true); on your JFrame instance.
Alternatively you may want to add your own WindowAdapater to make the JFrame un-minimizable etc by overriding windowIconified(..) and calling setState(JFrame.NORMAL); from within the method:
//necessary imports
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
public class Test {
/**
* Default constructor for Test.class
*/
public Test() {
initComponents();
}
public static void main(String[] args) {
/**
* Create GUI and components on Event-Dispatch-Thread
*/
javax.swing.SwingUtilities.invokeLater(new Runnable() {
#Override
public void run() {
Test test = new Test();
}
});
}
private final JFrame frame = new JFrame();
/**
* Initialize GUI and components (including ActionListeners etc)
*/
private void initComponents() {
frame.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
frame.setResizable(false);
frame.addWindowListener(getWindowAdapter());
//pack frame (size JFrame to match preferred sizes of added components and set visible
frame.pack();
frame.setVisible(true);
}
private WindowAdapter getWindowAdapter() {
return new WindowAdapter() {
#Override
public void windowClosing(WindowEvent we) {//overrode to show message
super.windowClosing(we);
JOptionPane.showMessageDialog(frame, "Cant Exit");
}
#Override
public void windowIconified(WindowEvent we) {
frame.setState(JFrame.NORMAL);
JOptionPane.showMessageDialog(frame, "Cant Minimize");
}
};
}
}
If you don't want to allow any user action use JWindow.
You may try to change your JFrame type to UTILITY. Then you will not see both minimize btn and maximize btn in your program.
I would recommend you to use jframe.setUndecorated(true) as you are not using any of the window events and do not want the application to be resized. Use the MotionPanel that I've made, if you would like to move the panel.
I don't get how can I employ this code:
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
to close the program with the x button.
You need the line
frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
Because the default behaviour for the JFrame when you press the X button is the equivalent to
frame.setDefaultCloseOperation(WindowConstants.HIDE_ON_CLOSE);
So almost all the times you'll need to add that line manually when creating your JFrame
I am currently referring to constants in WindowConstants like WindowConstants.EXIT_ON_CLOSE instead of the same constants declared directly in JFrame as the prior reflect better the intent.
If you don't have it, the JFrame will just be disposed. The frame will close, but the app will continue to run.
Calling setDefaultCloseOperation(EXIT_ON_CLOSE) does exactly this. It causes the application to exit when the application receives a close window event from the operating system. Pressing the close (X) button on your window causes the operating system to generate a close window event and send it to your Java application. The close window event is processed by the AWT event loop in your Java application which will exit the application in response to the event.
If you do not call this method the AWT event loop may not exit the application in response to the close window event but leave it running in the background.
I spent quite a bit of time spelunking through the internet for an elegant solution to this. As is usually the case, I found a lot of conflicting information.
I finally ended with:
Do not use EXIT_ON_CLOSE as this can leave resources behind;
Do use something like the following in the JFrame initialization:
setDefaultCloseOperation(DISPOSE_ON_CLOSE);
The real discovery was how to actually dispatch a window message to the JFrame. As an example, as part of your JMenuItem for exiting the application, use the following, where the function getFrame() returns a reference to the JFrame:
public class AppMenuFileExit extends JMenuItem implements ActionListener
{
// do your normal menu item code here
#Override
public void actionPerformed(ActionEvent e)
{
WindowEvent we;
we = new WindowEvent((Window) App.getFrame(), WindowEvent.WINDOW_CLOSING);
App.getFrame().dispatchEvent(we);
}
}
JFrame is a subclass of Window so may be cast to Window for this purpose.
And, have the following in your JFrame class to handle Window messages:
public class AppFrame extends JFrame implements WindowListener
{
// Do all the things you need to for the class
#Override
public void windowOpened(WindowEvent e)
{}
#Override
public void windowClosing(WindowEvent e)
{/* can do cleanup here if necessary */}
#Override
public void windowClosed(WindowEvent e)
{
dispose();
System.exit(0);
}
#Override
public void windowActivated(WindowEvent e)
{}
#Override
public void windowDeactivated(WindowEvent e)
{}
#Override
public void windowDeiconified(WindowEvent e)
{}
#Override
public void windowIconified(WindowEvent e)
{}
}
If you're using a Frame (Class Extends Frame) you'll not get the
frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE)
If you don't extend JFrame and use JFrame itself in variable, you can use:
frame.dispose();
System.exit(0);
The following code works for me:
System.exit(home.EXIT_ON_CLOSE);
this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
this worked for me in case of Class Extends Frame
What's the correct way to get a JFrame to close, the same as if the user had hit the X close button, or pressed Alt+F4 (on Windows)?
I have my default close operation set the way I want, via:
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
It does exactly what I want with the aforementioned controls. This question isn't about that.
What I really want to do is cause the GUI to behave in the same way as a press of X close button would cause it to behave.
Suppose I were to extend WindowAdaptor and then add an instance of my adaptor as a listener via addWindowListener(). I would like to see the same sequence of calls through windowDeactivated(), windowClosing(), and windowClosed() as would occur with the X close button. Not so much tearing up the window as telling it to tear itself up, so to speak.
If you want the GUI to behave as if you clicked the X close button then you need to dispatch a window closing event to the Window. The ExitAction from Closing An Application allows you to add this functionality to a menu item or any component that uses Actions easily.
frame.dispatchEvent(new WindowEvent(frame, WindowEvent.WINDOW_CLOSING));
setVisible(false); //you can't see me!
dispose(); //Destroy the JFrame object
Not too tricky.
If by Alt-F4 or X you mean "Exit the Application Immediately Without Regard for What Other Windows or Threads are Running", then System.exit(...) will do exactly what you want in a very abrupt, brute-force, and possibly problematic fashion.
If by Alt-F4 or X you mean hide the window, then frame.setVisible(false) is how you "close" the window. The window will continue to consume resources/memory but can be made visible again very quickly.
If by Alt-F4 or X you mean hide the window and dispose of any resources it is consuming, then frame.dispose() is how you "close" the window. If the frame was the last visible window and there are no other non-daemon threads running, the program will exit. If you show the window again, it will have to reinitialize all of the native resources again (graphics buffer, window handles, etc).
dispose() might be closest to the behavior that you really want. If your app has multiple windows open, do you want Alt-F4 or X to quit the app or just close the active window?
The Java Swing Tutorial on Window Listeners may help clarify things for you.
Stop the program:
System.exit(0);
Close the window:
frame.dispose();
Hide the window:
frame.setVisible(false);
If you have done this to make sure the user can't close the window:
frame.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
Then you should change your pullThePlug() method to be
public void pullThePlug() {
// this will make sure WindowListener.windowClosing() et al. will be called.
WindowEvent wev = new WindowEvent(this, WindowEvent.WINDOW_CLOSING);
Toolkit.getDefaultToolkit().getSystemEventQueue().postEvent(wev);
// this will hide and dispose the frame, so that the application quits by
// itself if there is nothing else around.
setVisible(false);
dispose();
// if you have other similar frames around, you should dispose them, too.
// finally, call this to really exit.
// i/o libraries such as WiiRemoteJ need this.
// also, this is what swing does for JFrame.EXIT_ON_CLOSE
System.exit(0);
}
I found this to be the only way that plays nice with the WindowListener and JFrame.DO_NOTHING_ON_CLOSE.
Exiting from Java running process is very easy, basically you need to do just two simple things:
Call java method System.exit(...) at at application's quit point.
For example, if your application is frame based, you can add listener WindowAdapter and and call System.exit(...) inside its method windowClosing(WindowEvent e).
Note: you must call System.exit(...) otherwise your program is error involved.
Avoiding unexpected java exceptions to make sure the exit method can be called always.
If you add System.exit(...) at right point, but It does not mean that the method can be called always, because unexpected java exceptions may prevent the method from been called.
This is strongly related to your programming skills.
** Following is a simplest sample (JFrame based) which shows you how to call exit method
import java.awt.event.*;
import javax.swing.*;
public class ExitApp extends JFrame
{
public ExitApp()
{
addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
dispose();
System.exit(0); //calling the method is a must
}
});
}
public static void main(String[] args)
{
ExitApp app=new ExitApp();
app.setBounds(133,100,532,400);
app.setVisible(true);
}
}
Not only to close the JFrame but also to trigger WindowListener events, try this:
myFrame.dispatchEvent(new WindowEvent(myFrame, WindowEvent.WINDOW_CLOSING));
Best way to close a Swing frame programmatically is to make it behave like it would when the "X" button is pressed. To do that you will need to implement WindowAdapter that suits your needs and set frame's default close operation to do nothing (DO_NOTHING_ON_CLOSE).
Initialize your frame like this:
private WindowAdapter windowAdapter = null;
private void initFrame() {
this.windowAdapter = new WindowAdapter() {
// WINDOW_CLOSING event handler
#Override
public void windowClosing(WindowEvent e) {
super.windowClosing(e);
// You can still stop closing if you want to
int res = JOptionPane.showConfirmDialog(ClosableFrame.this, "Are you sure you want to close?", "Close?", JOptionPane.YES_NO_OPTION);
if ( res == 0 ) {
// dispose method issues the WINDOW_CLOSED event
ClosableFrame.this.dispose();
}
}
// WINDOW_CLOSED event handler
#Override
public void windowClosed(WindowEvent e) {
super.windowClosed(e);
// Close application if you want to with System.exit(0)
// but don't forget to dispose of all resources
// like child frames, threads, ...
// System.exit(0);
}
};
// when you press "X" the WINDOW_CLOSING event is called but that is it
// nothing else happens
this.setDefaultCloseOperation(ClosableFrame.DO_NOTHING_ON_CLOSE);
// don't forget this
this.addWindowListener(this.windowAdapter);
}
You can close the frame programmatically by sending it the WINDOW_CLOSING event, like this:
WindowEvent closingEvent = new WindowEvent(targetFrame, WindowEvent.WINDOW_CLOSING);
Toolkit.getDefaultToolkit().getSystemEventQueue().postEvent(closingEvent);
This will close the frame like the "X" button was pressed.
If you really do not want your application to terminate when a JFrame is closed then,
use : setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
instead of : setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Here's a synopsis of what the solution looks like,
myFrame.dispatchEvent(new WindowEvent(myFrame, WindowEvent.WINDOW_CLOSING));
This examples shows how to realize the confirmed window close operation.
The window has a Window adapter which switches the default close operation to EXIT_ON_CLOSEor DO_NOTHING_ON_CLOSE dependent on your answer in the OptionDialog.
The method closeWindow of the ConfirmedCloseWindow fires a close window event and can be used anywhere i.e. as an action of an menu item
public class WindowConfirmedCloseAdapter extends WindowAdapter {
public void windowClosing(WindowEvent e) {
Object options[] = {"Yes", "No"};
int close = JOptionPane.showOptionDialog(e.getComponent(),
"Really want to close this application?\n", "Attention",
JOptionPane.YES_NO_OPTION,
JOptionPane.INFORMATION_MESSAGE,
null,
options,
null);
if(close == JOptionPane.YES_OPTION) {
((JFrame)e.getSource()).setDefaultCloseOperation(
JFrame.EXIT_ON_CLOSE);
} else {
((JFrame)e.getSource()).setDefaultCloseOperation(
JFrame.DO_NOTHING_ON_CLOSE);
}
}
}
public class ConfirmedCloseWindow extends JFrame {
public ConfirmedCloseWindow() {
addWindowListener(new WindowConfirmedCloseAdapter());
}
private void closeWindow() {
processWindowEvent(new WindowEvent(this, WindowEvent.WINDOW_CLOSING));
}
}
Based on the answers already provided here, this is the way I implemented it:
JFrame frame= new JFrame()
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// frame stuffs here ...
frame.dispatchEvent(new WindowEvent(frame, WindowEvent.WINDOW_CLOSING));
The JFrame gets the event to close and upon closing, exits.
You have to insert the call into the AWT message queue so all the timing happens correctly, otherwise it will not dispatch the correct event sequence, especially in a multi-threaded program. When this is done you may handle the resulting event sequence exactly as you would if the user has clicked on the [x] button for an OS suppled decorated JFrame.
public void closeWindow()
{
if(awtWindow_ != null) {
EventQueue.invokeLater(new Runnable() {
public void run() {
awtWindow_.dispatchEvent(new WindowEvent(awtWindow_, WindowEvent.WINDOW_CLOSING));
}
});
}
}
I have tried this, write your own code for formWindowClosing() event.
private void formWindowClosing(java.awt.event.WindowEvent evt) {
int selectedOption = JOptionPane.showConfirmDialog(null,
"Do you want to exit?",
"FrameToClose",
JOptionPane.YES_NO_OPTION);
if (selectedOption == JOptionPane.YES_OPTION) {
setVisible(false);
dispose();
} else {
setDefaultCloseOperation(javax.swing.WindowConstants.DO_NOTHING_ON_CLOSE);
}
}
This asks user whether he want to exit the Frame or Application.
setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
Posting what was in the question body as CW answer.
Wanted to share the results, mainly derived from following camickr's link. Basically I need to throw a WindowEvent.WINDOW_CLOSING at the application's event queue. Here's a synopsis of what the solution looks like
// closing down the window makes sense as a method, so here are
// the salient parts of what happens with the JFrame extending class ..
public class FooWindow extends JFrame {
public FooWindow() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(5, 5, 400, 300); // yeah yeah, this is an example ;P
setVisible(true);
}
public void pullThePlug() {
WindowEvent wev = new WindowEvent(this, WindowEvent.WINDOW_CLOSING);
Toolkit.getDefaultToolkit().getSystemEventQueue().postEvent(wev);
}
}
// Here's how that would be employed from elsewhere -
// someplace the window gets created ..
FooWindow fooey = new FooWindow();
...
// and someplace else, you can close it thusly
fooey.pullThePlug();
If you do not want your application to terminate when a JFrame is closed,
use:
setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE)
instead of:
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
From the documentation:
DO_NOTHING_ON_CLOSE (defined in WindowConstants): Don't do anything; require the program to handle the operation in the windowClosing method of a registered WindowListener object.
HIDE_ON_CLOSE (defined in WindowConstants): Automatically hide the frame after invoking any registered WindowListener objects.
DISPOSE_ON_CLOSE (defined in WindowConstants): Automatically hide and dispose the frame after invoking any registered WindowListener objects.
EXIT_ON_CLOSE (defined in JFrame): Exit the application using the System exit method. Use this only in applications.
might still be useful:
You can use setVisible(false) on your JFrame if you want to display the same frame again.
Otherwise call dispose() to remove all of the native screen resources.
copied from Peter Lang
https://stackoverflow.com/a/1944474/3782247