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I try to switch the scene of a Gluon application when a custom event is fired.
When I call
MobileApplication.getInstance().switchView(SECONDARY_VIEW);"
I get the error
Exception in thread “Thread-6” java.lang.IllegalStateException: This operation is permitted on the event thread only; currentThread = Thread-6
This is the listener that handles the custom event
ParallelServerInterface.setLoginResponseListener(new LoginResponseListener() {
@Override
public void loginResponseReceived(LoginResponse loginResponse) {
Map<String, String> source = (Map<String, String>) loginResponse.getSource();
boolean status = source.get("status").equals("true");
if (status) {
MobileApplication.getInstance().switchView(SECONDARY_VIEW);
}
}
});
How can this be resolved?
Answer
Any call to MobileApplication.getInstance()::switchView should happen in the JavaFX Application thread, as it basically involves changes in the scenegraph.
Roughly, you are removing the old View (which is a Node), and adding a new one (another Node):
glassPane.getChildren().remove(oldNode); glassPane.getChildren().add(newNode);
And as you know, anything related to node manipulation has to be done in the JavaFX Application thread.
It seems the login event is triggered in a background thread, so all you need to do is to queue the view switch to the application thread, using Platform.runLater:
@Override
public void loginResponseReceived(LoginResponse loginResponse) {
Map<String, String> source = (Map<String, String>) loginResponse.getSource();
boolean status = source.get("status").equals("true");
if (status) {
// switch view has to be done in the JavaFX Application thread:
Platform.runLater(() ->
MobileApplication.getInstance().switchView(SECONDARY_VIEW));
}
}