I need my JFrame to freeze/ become inaccessible, similar to how it would with a model JDialog or setEnabled(false).
In most cases I would use JDialog but in this instance I am running a dialog through a C library.
Going down the setEnabled(false) line also doesn't work because it, on setEnabled(true), will send the window to the back. And even using toFront() will cause the window to go to the back for a split second then come to the front again.
Is there a better way to go about doing this, or an I stuck with the slight imperfection of the window flickering.
Also if you are familiar with the library I am using LWJGL's NativeFileDialog wrapper.
I have found a pretty good solution to this issue, originally answered as part of this post. It takes the idea of using a JDialog, but instead of displaying some message it is completely transparent, invisible to the user.
final JDialog modalBlocker = new JDialog();
modalBlocker.setModal(true);
modalBlocker.setUndecorated(true);
modalBlocker.setOpacity(0.0f);
modalBlocker.setDefaultCloseOperation(WindowConstants.DO_NOTHING_ON_CLOSE);
Then we can simply display our modal and show our file dialog
// Using invoke later we show our dialog after our frame has been blocked
// by setVisible(true)
SwingUtilities.invokeLater(()->{
// show dialog
});
modalBlocker.setVisible(true);
modalBlocker.dispose(); // immediately release resources
Then we can call modalBlocker.setVisible(false) at any point to stop the modality effect on our frame.
Again this is the solution that worked for me, it is not mine. The code was written to integrate JavaFX with Swing by Sergei Tachenov, all credit goes to him!
Related
Is there a possibility to prevent a JOptionPane dialog from blocking the interaction with the rest of the program, especially child JFrames? In my GUI, I launch a JFrame and want a message dialog to pop up after the child is closed to remind the user of something, but they launch parallel and the reminder blocks the child frame from being used.
Like here:
popupObjMan newPopup1 = new popupObjMan(gatewayAbstract, gatewayAbstractID);
JOptionPane.showInternalMessageDialog(this, "REMINDER: DO REFRESH");
I've tried to set the popup always on top, but this doesn't quite do the job.
I have no problem with them launching parallel (I'd even prefer it), but I could not work my head around it yet.
I just started Java programming ,so sorry in case that'd be something obvious.
A JOptionPane normally need to be modal. It shows something important and waits till the user answers with whatever option you give him (e.g. ok-button, yes/no-buttons, ...)
But there are several ways to reach your target.
(a)
Normally a JOptionPane creates a modal window.
You need a modeless window which does not block other windows.
https://docs.oracle.com/javase/tutorial/uiswing/misc/modality.html
(b)
You can start different threads to work for your different windows. They can have windows which are shown whenever the responsible thread commands them to. This is a bit difficult and can lead to memory-troubles.
(c)
You can write your own message-panels (e.g. notificaton) which are shown when and how long you like.
Bigger projects use different of these ways to achieve their goals.
A JOptionPane is a component, just like a JPanel. As a component it can be added to any other panel.
The JOptionPane API provides static methods to create a show the JOptionPane on a modal JDialog by default. You can't change this behaviour.
However, you can manually add the JOptionPane to a non-modal JDialog that you create. This is extra work as you now need to handle the closing of the dialog and processing the clicked button.
If you really want to do this then read the JOptionPane API. There is a section on Direct Use which demonstrates the basic code needed to add the JOptionPane to a JDialog.
I have written an application in Java that has a JFrame with options. I now want a certain action to be executed when the user has confirmed the dialog with "Ok". I was recommended to add a return value to JFrame.
Unfortunately, I don't have any experience and need some help. Here are the details.
I want to extend JFrame so that I can have an Enum "DialogResult" when closing a JFrame like in the .Net Framework. Well, the Enum is no problem. My problem is to replicate the ShowDialog method from WinForms of the .Net Framework working in Java for the class JFrame.
Below is an example code in C#:
// DlgOptions : Form
DlgOptions dlg = new DlgOptions();
if(dlg.ShowDialog() == DialogResult.Ok)
{
// do something only when "Ok" was clicked
}
Here's a link from MSDN with the behavior I want to replicate:
https://msdn.microsoft.com/de-de/library/c7ykbedk(v=vs.110).aspx
How can I best implement this? Thanks in advance.
EDIT:
I changed my DlgOptions class so it doesn't extend JFrame but JDialog. I also added an enumeration DialogResult and added a public property of this type in my DlgOptions. But I still have a problem. When I use this code:
// executed when user clicked a JMenuItem in a JMenuBar
DlgOptions dlg = new DlgOptions();
dlg.setModal(true);
dlg.setVisible(true);
if(dlg.DialogResult == DialogResult.OK)
{
// do something
}
the program continues running before the user closed the modal dialog. What can I do?
EDIT 2:
My JDialog contains two JButtons; one to confirm changes that were made and one to abort changing the preferences for the program. I have several JCheckBoxes the user can check or uncheck.
So a JOptionPane would not be what I want / need (as far as I know). That's why I need a modal JDialog. But my Java code above doesn't work as I want it to. I read on a German website of a Java book that a JDialog set to modal with
setModal(true);
would cause the program to wait until the dialog is closed. The problem is, that the code continues too early.
I have a fairly simple Java Application I created with JFrames. There is more than one JFrame in my program. I have a menu launching at the beginning of the program. After going through the menu, I have the menu JFrame disposed.
The main JFrame has a menu button that should launch the exact same menu at a later time. However, when you launch the menu from inside of the ActionListener (when you press the menu button), the JFrame doesn't launch properly. None of the components show up and colors are off.
However, when the menu is launched from outside of the ActionListener, the JFrame shows up perfectly. I have tried multiple methods to fix this, but none of them have worked.
My full program code is available by clicking here.
The main class is "LetsMultiply5.java". This class also sets up the ActionListener.
The JFrame causing the problem is "MenuWindow.java".
"LetsMultiply5.java" calls the "Booter.java" class, which then calls the "MenuWindow.java".
"MainWindow.java" is the JFrame that has the "Menu" button.
For proof, "SpeedModer.java" calls the menu window after it has been disposed, and works.
================================EDIT================================
Also, I'd like to let you know that I realize my code is a little bit messy. I am not sure how else to write the code for this program.
I am forced to use Thread.sleep(x); because the Swing timers aren't what I am looking for. The Swing timers activate an ActionListener when the timer goes off. I need a system that will wait a second before continuing on with the code.
I realize that the while (repeater==0) loop with ActionListeners inside of it seems crazy, but that was the only way I could get it to work. If I put a single ActionListener and just had the while loop do no code inside of it, nothing happens when I press the button.
I would, as MadProgrammer mentioned:
Advice: Scrap your current approach and start again.
However, the way that I have my program currently coded is the only way that I know how to get what I need to do done. I read the tutorials, but still don't know how to improve the code in the way that you told me.
I thank everyone for trying to tell me to improve my bad "Java grammar", but as far as I am concerned, I am not going to continue this program for the next 20 years and make my millions off of it.
I have looked at the Swing timers before and I understand the whole new Timer(speed, this); concept, but I don't understand how this would make my code any better.
If anyone would like to show me how to fix my ActionListeners or Thread.sleep(x); lines, please tell me. Thank you.
You're blocking the Event Dispatching Thread with Thread.sleep(3000); - Don't do this, it will prevent the UI from been painted
See Concurrency in Swing for more details about the problem and How to use Swing Timers for a possible solution
You may also want to consider having a look at The Use of Multiple JFrames, Good/Bad Practice? and consider using CardLayout or JTabbedPane
If you need to block the user temporarily (to display a error message or gather important details), consider using a modal JDialog. See How to Make Dialogs for more details
I am developing a Swing application with custom CSS rendering. As part of the system I use JDialogs as well, but I need to access certain components outside of the dialog (emergency buttons).
For this I chose following method:
all dialogs are non-modal. Those I want to make quasi-modal, will be setAlwaysOnTop.
There is always one quasi modal dialog up. In this case I put another dialog up, below this one, full-screen, semi-permanent.
This "blur" dialog shall cover the whole screen, catch mouse events and forward them to the emergency buttons only. In parallel I opened gaps on it so that the emergency buttons can be seen through the semipermanent surface without any effect.
The blur dialog can never be focused or activated (I have a vetoable listener for this)
Everything works fine, until someting happens and the blur dialog seems to cover my quasi-modal dialog. However, if I move any external application window over it, the quasi-modal dialog remains on the top. Instead of a complicated explanation, see picture un following link: http://lost.lost.hu/javascreen.png
So far I tried to debug repaints, events, everything, and could not find anything that would cause this. Especially the case depicted above challenges me to understand what is going on here.
I have recently updated to Java 1.7, in hope to get rid of this phenomenon, but today it came back.
Greetings everyone. I have a problem which i can solve. I need that JOptionPane does not showing in my application maybe there some way to make this. Best regards Alejandro Del Rio.
Normally a JOptionPane is shown by using one the the showXXX static methods. Using this approach you don't have a reference to the actual dialog so you can't just hide the option pane.
Read the JOptionPane API documentation. There you will find a "Direct Use" example of using a JOptionPane. In this case you are responsible for more code to handle the showing of the dialog and for handling the selected option button. But you do have a reference to the actual dialog so you can use setVisible( false ) as required.
Of course option panes are modal so you still need to somehow schedule the closing of the dialog, maybe by starting a Swing Timer before the option pane is displayed.
Have you tried setVisible() ?
JOptionPane optionPane = new JOptionPane();
...
...
...
optionPane.setVisible(false);
I just cant to setVisiable();
I have a class which i does not have a source code and there are many not needed Joptionpane shows i want not one of them is not showing in application.