How to ask pane to re-layout

Question

It seems that in Javafx2 when you add items to a pane, then make one invisible it still takes up space in the layout. Does anyone know how to ask the pane to adjust it's layout after a child is made invisible?

Below is a sample program that demonstrates my issue. There are 3 buttons in a VBox. When you click on the top or middle button it become invisible, but it leaves a gap.

public class VisibilityTest extends Application {

Button button1 = null;
Button button2 = null;
Button button3 = null;
VBox   box     = null;

@Override
public void start(Stage primaryStage) {
    button1 = new Button("Button 1");
    button2 = new Button("Button 2");
    button3 = new Button("Button 3");

    box = new VBox();
    box.getChildren().add(button1);
    box.getChildren().add(button2);
    box.getChildren().add(button3);
    button1.setOnAction(new EventHandler<ActionEvent>() {
        @Override
        public void handle(ActionEvent t) {
            button1.setVisible(false);
        }
    });
    button2.setOnAction(new EventHandler<ActionEvent>() {
        @Override
        public void handle(ActionEvent t) {
            button2.setVisible(false);
        }
    });
    button3.setOnAction(new EventHandler<ActionEvent>() {
        @Override
        public void handle(ActionEvent t) {
            button3.setVisible(false);
        }
    });
    Scene scene = new Scene(box, 300, 250);
    primaryStage.setScene(scene);
    primaryStage.show();
}
}

I just read in the VBox javadoc `VBox lays out each managed child regardless of the child's visible property value; unmanaged children are ignored.`. It looks like visibility is different in javafx than in swing. Visible items are not ignored in layout. — phil-daniels, Oct 27 '12 at 22:01
Yes see this related [http://stackoverflow.com/q/12200195/682495](http://stackoverflow.com/q/12200195/682495) — Uluk Biy, Oct 28 '12 at 11:43

score 1 · Answer 1 · answered Oct 26 '12 at 15:22

1

Call validate() of the higher level component.

answered Oct 26 '12 at 15:22

AlexR

114,158
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Hmm... I don't see a validate() method on any of the javafx pane classes. – phil-daniels Oct 27 '12 at 21:34

score 0 · Accepted Answer · answered Oct 26 '12 at 17:07

0

You need to remove the control from scene graph.

parent.getChildren().remove(theControl);

answered Oct 26 '12 at 17:07

amru

1,388
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Removing the item and adding it back later worked for my purposes. Thanks! – phil-daniels Oct 27 '12 at 22:08

How to ask pane to re-layout

2 Answers2