how to close and open a javafx gui multiple times the correct way..

[mike Vigor]

So I'm working on a javafx simple game project which involves communicating with a server through rmi.
Data for setup will be obtain from the user through a javafx gui which will be closed and opened multiple times depending on how the setup goes.
The javafx gui's are called from the SetUp class which does not extend application itself.
After setup is complete the main game gui(javafx) will be loaded..

Assuming we have two gui's, LoginGui and OptionGui to call in that order..

Problem: call to LoginGui is successful with

Application.launch(LoginGui.class);

Successive calls to OptionGui was not working so I was told to place the line

 Platform.setImplicitExit(false);

before stage.show () in the first gui class which starts the Application process
and then in my SetUp class after the first gui which is called with "Application.launch(gui.class)" closes, other gui classes can be called with this code example

      Platform.runLater(() -> 
	       {
               try {
	/*debugging*/	System.out.println("reache line 74");

            	   OptionGui opG = new OptionGui();
    		       opG.start(OptionGui.primaryStage);
               }
               catch (Exception ex)
               {
            	   ex.printStackTrace(System.out);
               }
           });

but the program just jumps this lines of code and continues without showing the OptionGui, can someone pinpoint me the correct way to do this? thanks in advance

[Knute Snortum]

In general, you don't launch several applications in JavaFX, but you can use several stages.  Stages can be hidden or shown as needed.

So in your case, I would launch the a main GUI but not show the stage.  Then create a second stage that is the login window and show it.  Once the user has successfully logged on, hide the login stage and show the main stage.

[mike Vigor]

Knute Snortum wrote:In general, you don't launch several applications in JavaFX, but you can use several stages.  Stages can be hidden or shown as needed.

So in your case, I would launch the a main GUI but not show the stage.  Then create a second stage that is the login window and show it.  Once the user has successfully logged on, hide the login stage and show the main stage.

ok, can you post a code snippet to launch a stage from outside the gui class? in my example from one of the SetUp class methods? a very short example of launching a first stage and closing it, and launching another one..all in another class's main or method..

[Knute Snortum]

package net.snortum.play;

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

public class JavaFxPlay extends Application {
	public static void main(String[] args) {
		launch();
	}

	@Override
	public void start(Stage primaryStage) throws Exception {
		Label label = new Label("This is the main GUI");
		VBox root = new VBox();
		root.getChildren().add(label);
		Scene scene = new Scene(root, 300, 200);
		primaryStage.setScene(scene);
		primaryStage.setTitle("Main");
		
		showSecondaryStage();
		primaryStage.show();
	}

	private void showSecondaryStage() {
		Stage newStage = new Stage();
		newStage.setTitle("Login");
		Label label = new Label("Login here");
		VBox root = new VBox();
		root.getChildren().add(label);
		Scene scene = new Scene (root, 100, 50);
		newStage.setScene(scene);
		newStage.showAndWait();
	}
}

[mike Vigor]

@Knute Snortum
Thanks but this is not my problem, I will love to see a snippet on how to call the gui multiple times from another class with a void main, like this for an example using your JavaFxPlay class...

public class SetUp 
{
      //field 1
      //field 2

       public SetUp()
       {
        }
        public sessionSetUp()
        {
           //some code, then launch login gui
            Application.launch(JavaFxPlay.class);
           
          //main gui closes and exits after finishing
          //some more code then i need to show the secondary stage of your example
          
          Application.launch(JavaFxPlay.showSecondaryStage()); //of course this is wrong, how to do this is my problem!!!
        }
	public static void main(String[] args)
	{
		// TODO Auto-generated method stub
		SetUp setup = new SetUp();
		setup.sessionSetUp();

	}

}

[Knute Snortum]

I don't know if that is possible.  The two GUIs need to interact?  If it's a login to a server, maybe test the login first, then launch the second GUI.  Maybe the first GUI talks to the second through a socket.

I think I need to know your use case.  Normally, to log into a server, then use that connection, you would use the model I showed you.  Why do you need to launch a program, login, then go back to launching program to continue?

[mike Vigor]

Knute Snortum wrote:I don't know if that is possible.  The two GUIs need to interact?  If it's a login to a server, maybe test the login first, then launch the second GUI.  Maybe the first GUI talks to the second through a socket.

I think I need to know your use case.  Normally, to log into a server, then use that connection, you would use the model I showed you.  Why do you need to launch a program, login, then go back to launching program to continue?

because the game in itself communicates to a server via rmi, so SetUp is just a controller in the middle, it gets values from the gui, then calles remote objects methods and sends data, when it gets return values or messages from the server, then it fires a gui passing the results from server as parameters, something like that...I hope you get the idea...

I know it can be  done, I just haven't figured how...

[Paweł Wodzyński]

I know this topic is old but I'll leave my answer here because I might come back here sometime if you want to disable the JavaFX window and later call it again with Platform.runLater

you must set this line at the beginning of your program
platform.setImplicitExit(false);

this will cause the JavaFX thread to not exit after closing the last window and Platform.runLater will not be skipped when invoking

But if you want to call the window again it is necessary to put it in Platform.runLater
a new Stage was created


                           platform.runLater(() -> {
                               
                               Stage newStage = new Stage();
                               loginMaster = new LoginMaster(newStage, mySqlJdbcTemplate, master);
                               loginMaster.showLoginScene();
                           });

[Campbell Ritchie]

PW: welcome to the Ranch

[Lou Hamers]

Paweł Wodzyński wrote:I know this topic is old but I'll leave my answer here because I might come back here sometime if you want to disable the JavaFX window and later call it again with Platform.runLater

you must set this line at the beginning of your program
platform.setImplicitExit(false);

this will cause the JavaFX thread to not exit after closing the last window and Platform.runLater will not be skipped when invoking

But if you want to call the window again it is necessary to put it in Platform.runLater
a new Stage was created


                           platform.runLater(() -> {
                               
                               Stage newStage = new Stage();
                               loginMaster = new LoginMaster(newStage, mySqlJdbcTemplate, master);
                               loginMaster.showLoginScene();
                           });

This isn't the same as closing and re-creating so maybe not applicable, but if you're just hiding the UI is there a reason you don't just call hide() and show() on the primary stage? (With whatever you have in mind to trigger the stage to re-appear.)