Removing listeners during the stage closed

Hello

In my view controller I would add a few listeners at two TextFields in the "initialize" method call When you exit the view controller where would be the right place to remove the listeners?

See you soon

Andy

Do you really need to? If you keep no references to the scene, the décor and the scene beyond graph where you need, auditors need to go out of reach anyway.

If you need to structure things in the opposite case, it is possible, but a little convoluted. Obviously, in your initialize() method, text fields have not yet added to a stage, or probably to a scene, so it's difficult to register a listener with the scene. The trick is to listen to the property window of the property of scene of the text fields (or any node in the same scene graph) and record a listener with the window when it is defined. The following for this code and also to clean if the text field is removed from the scene (or the scene of the scene).

                // textField in this line can be replaced by anything in the same scene (e.g. the root node of the scene)
                final ObjectBinding windowBinding = Bindings.select(textField.sceneProperty(), "window");
                final EventHandler windowClosedHandler = new EventHandler() {
                    @Override
                    public void handle(WindowEvent event) {
                        System.out.println("Window closed");
                        textField.textProperty().removeListener(textListener);

                        // this listener no longer needed:
                        if (event.getSource() instanceof Window) {
                            ((Window)event.getSource()).removeEventHandler(WindowEvent.WINDOW_HIDDEN, this);
                        }
                    }
                };
                windowBinding.addListener(new ChangeListener() {
                    @Override
                    public void changed(ObservableValue observable,
                            Window oldWindow, Window newWindow) {
                        if (oldWindow != null) {
                            oldWindow.removeEventHandler(WindowEvent.WINDOW_HIDDEN, windowClosedHandler);
                        }
                        if (newWindow != null) {
                            newWindow.addEventHandler(WindowEvent.WINDOW_HIDDEN, windowClosedHandler);
                        }
                    }
                });

Tags: Java

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