[FIXED] How to get Anchor Property from an anchorpane to do some binding or animations?

Issue

I am trying to get anchorpane leftAnchorProperty to create a new KeyValue but it is not working.

My code:

Animation a = new Timeline( new KeyFrame(
Duration.seconds(2), new KeyValue(MyAPane.leftAnchorProperty(child), 10)
));

What am I doing wrong?

Solution

There is no such property since the value is stored in the properties ObservableMap. (The value is stored there, since only children of a AnchorPane need it, but there are other layouts a Node can be added to.)

However in your case you only need a WritableValue, which you can easily implement yourself:

WritableValue<Double> writable = new WritableValue<Double>() {

    @Override
    public Double getValue() {
        return AnchorPane.getLeftAnchor(child);
    }

    @Override
    public void setValue(Double value) {
        AnchorPane.setLeftAnchor(child, value);
    }

};

// a starting value for the animation is important, since otherwise interpolation won't work
AnchorPane.setLeftAnchor(child, 0d);

Consider using the translateX property though. This would be simpler...

Answered By - fabian
Answer Checked By - Marilyn (JavaFixing Volunteer)