I've created a stand-alone java desktop application in Netbeans 6.9. I want to set the action for the close button of my application. I want to know how and where to set the code for the action of that close button. Can anyone please help me regarding this?
You have to register an ActionListener on your close button. In this listener you can define what do to.
How add ActionListener to JButton in Java Swing
I think answers for How to close a java swing application from the code will be helpful too
Right-click on the button then, > Events > Action > actionPerformed. NetBeans will generate the action listener for you:)
Edit: If you want a close listener, then read here.
Once you have the handler working, one convenient approach is to "set the default button by invoking the setDefaultButton() method on a top-level container's root pane." See the tutorial section How to Use JButton Features for details.
I dislike to wake up the zombies but, here is what I would do (this is considering that you are working in a Window based application, otherwise this is going to be useless!!!):
I would set a window listener for the close operation here is the way to do it.
Then I will delete manually the temp folders and files...
Obviously the window listener I'm talking about would go on the last window you (as a user) should close, this would not work either if you want it to happen when the last window is closed, but there is not an order specified to do that, some workarounds for that is making all your windows to share a flag/counter to indicate if it is time to delete the temp files/folders.
Again if your application is going to work underground sometimes (I mean that you can dispose all windows without shutting down the application), or is a daemon this won't work
If you just want to exit the application when the close button is hit, you can use
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
as explained in the Oracle tutorial
Related
What is the best way to handle events (enable or disable button) or share parameters across different windows that are opened of the same applet ?
I am not referring to the browser window, instead (run as applet) window in the local IDE.
Which can be the best method to handle this scenario and let the other window know that the event has occurred already and proceed to the next step ? Here, there are no multiple applets. Just one applet, one code base, but multiple instances created.
Java uses a model, view, controller system. The model would be the variables under the hood, the view would be the applet, and the controller would be the buttons and other interactions. Many of the Swing components take a variable(model) in the constructor and automatically update with that. If you want to alert a specific function that a variable has been changed by any button, use property change listeners.
http://docs.oracle.com/javase/tutorial/uiswing/events/propertychangelistener.html
I need to add a functionality in my application that would require me to know when the user changes window (it could be a browser window, my application's window or any other window).
Ideally, it should be possible for me to print the window's title when it gets focus. The problem I'm having finding a solution to this problem is that I only get links that tell me how to add a focus listener on windows I'm creating, which I already know how to do and doesn't help me in the slightest.
The solution should at least work on Windows 7.
The (major) problem you face is that Java filters system events so that you can only recieve events that are related to you. AFAIK this is all done at a native level, so there's no way to intercept or modify this filtering process.
The only solution is to create another "event loop" using JNI/JNA which will allow you to intercept the event messages being passed about the system and handle them the way you want to.
While slightly more complicated, it does open up a world of opportunities...
I try to make an application which must be full screen. But when i press CTRL+ALT+DEL task manager comes up. Even i disable task manager, at this time its error message comes up and make taskbar visible. Then user get the chance to go to the dekstop but i dont want user to get this chance. Only user could be able to go to desktop when it did what application wants from it. So i need taskbar keep bottom of other windows until user does what it should do. And i need to do this by my application which i try to code in Java
How can i change the status of task bar using registry?
Why not permanently disable the taskbar?
Follow this link to permanently disable the task bar.
You can edit .reg files in Java, follow This link to know how to edit .reg files
"But how can i do it by java without reseting the machine?"
As far as i came across, you have to reboot your system, no way out.
Ok i found it.
When i changed the value of 8th byte value of Settings variable to 10 in
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\StuckRects2
in registery
It just deselect the "Keep the task bar on top other windows" option
For applying the changes explorer.exe should be killed and re run
There are key strokes which Windows catches before they are sent to application and Ctrl+Alt+Del is one of those.
Regarding "Then user get the chance to go to the dekstop", if you set frame.setAlwaysOnTop(true);, user won't be able to switch to other any application.
You can use java's fullscreen API, and then use a Robot to force focus back to your application. See here: Java Full Screen Program (Swing) -Tab/ALT F4.
Good luck in whatever you are doing - it doesn't sound fun!
I'm trying to learn Java so sorry if this is a stupid question, but I seem to be unable to change the default close operation on my JFrame in NetBeans.
In NetBeans I created a JFrame and implemented some controls on it using the NetBeans GUI designer. However, I noticed that after I close the JFrame, my application would close even though I have another form that is supposed to appear afterwards.
After digging through the JFrame generated code I found:
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
From research it appears that this causes the application to close when the frame is closed. I would prefer to not have this happen. From looking around, it appears I either need to use DISPOSE_ON_CLOSE or DO_NOTHING_ON_CLOSE in order to get the window to close but still have additional code to run.
However, I can't figure out how to get NetBeans to change this value through the designer. I found the defaultCloseOperation in the Properties -> Bindings window, but every time I enter something into the text area and press enter my text disappears. The binding has an elipsis but I can't figure out what the binding window actually does.
How can I change my setDefaultCloseOperation() to a new value?
It is right there in the properties panel. Just make sure that the whole JFrame is selected. You can select your JFrame from Inspector panel.
Try to update defaultCloseOperation value from Properties -> Properties tab, not binding tab
If you open the file with a different editor (i.e. notepad) you will realize that netbeans puts some lines in the file to make specific sections read only.
You can always remove those lines, or even edit whatever you want with another editor.
You can always right-click on your frame, choose Customize Code and make your changes there.
Setting: Java 5 - no upgrade possible.
I have a large application that has a number of modal dialog windows. I have heard that hidden modal dialogs can result in uninformed users going so far as to restart their computer. Even if a user knows how to ALT-TAB (in MS Windows, at least), it's a pain. From what I understand, this was in part fixed in later versions of Java, but that's not an option here, unfortunately.
So, is there any way to force a modal dialog to be shown if any part of the running application is clicked on? I was thinking it might have something to do with either MouseListeners, GlassPanes, or something else. However, I've got a bunch of other stuff I'm supposed to be working on, so I don't have a lot of time to devote to hashing this out right now. Can anybody point me in the right direction?
Thanks so much!
So, is there any way to force a modal dialog to be shown if any part of the running application is clicked on?
When you create the dialog you need to specify the parent frame as the owner of the dialog. Then whenever you click on the frame any dialog that is a child will also be shown.