Gainer Focus and lost Focus

How implements methods for gainer focus and the focus lost?

Thank you

Use a listener changes node.focusedProperty () to find out when a field wins or loses the focus.
Call node.requestFocus () to request the update (for some reason any I have to wrap it in Platform.runLater so that he can actually do something).
Call node.setFocusTraversable (false) If you do not want the user to be able to tab to the node, but still be able to click on the node to give it focus.
Call node.setDisable (true) If you do not want the knot to be active at all.

I don't know how is calculated the order of focus traversable, maybe the order in which items are added to the scene?
Not sure how you would create a crossing of focus custom if you need.

  @Override public void start(Stage primaryStage) {
    final TextField tf1 = new TextField("First but not initially focused");
    final TextField tf2 = new TextField("Second initially focused");
    Platform.runLater(new Runnable() { public void run() { tf2.requestFocus(); } });
    final TextField tf3 = new TextField("Can focus by clicking on, but not by tabbing to.");
    tf3.setFocusTraversable(false);
    final TextField tf4 = new TextField("Cannot focus at all.");
    tf4.setDisable(true);
    tf1.focusedProperty().addListener(new ChangeListener() {
        public void changed(ObservableValue observable, Boolean oldValue, Boolean newValue) {
          if (newValue) {
            System.out.println("First text field gained focus");
          } else {
            System.out.println("First text field lost focus");
          }
        }
      }
    );

    VBox root = new VBox(); root.setSpacing(5);
    root.getChildren().addAll(tf1, tf2, tf3, tf4);
    primaryStage.setScene(new Scene(root, 300, 100));
    primaryStage.show();
  }

Tags: Java

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