CODEWITHSUNDEEP
listenerjavafx-2actionlistenerfxml
me.at.coding
me.at.coding

Reputation: 17604

Programmatically remove a listener added using FXML?

I am adding a listener using FXML:

<RadioButton onAction="#onSelectionChanged" />

Now I need to temporarily disable this listener programmatically.

Now I could set some boolean variable "listenerDisabled" and check this variable in the listener, but I want a way to disable a listener without changing it - so I want to remove it.

The problem here is: How do I reference the listener in my code, so I can use the following?

RadioButton.selectedProperty().removeListener(<what to place here?>)

Thanks for any hint!

Upvotes: 2

Views: 3740

Answers (1)

jewelsea
jewelsea

Reputation: 159291

Add an fx:id specification to your fxml:

<RadioButton fx:id="myRadio" onAction="#onSelectionChanged" />

In the corresponding controller for the fxml, use the @FXML notation to have the FXMLLoader inject a reference to the radio button into your controller:

@FXML RadioButton myRadio;

To get a reference to the listener, invoke getOnAction:

EventHandler<ActionEvent> myRadioActionEvent = myRadio.getOnAction();

To remove the listener, use setOnAction:

myRadio.setOnAction(null);

To add the listener back again, use setOnAction again:

myRadio.setOnAction(myRadioActionEvent);

I didn't try any of the above, but I don't see why it would not work.

Upvotes: 3

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