Zooming in JavaFx: ScrollEvent is consumed when content size exceeds ScrollPane viewport

Question

I have an application that requires zoom inside a ScrollPane, but with my current approach I\'m still facing 2 challenges. In order to replicate the problem, I have written

Answer 1

The following workaround seems to be giving better results:

1. Set onscroll event on the outer group to steal the event from the scroll pane.

2. Add a opaque rectangle which covers the whole screen, so that you don't miss the scroll event. Apparently you can miss scroll event if you don't hit a shape.

   Rectangle opaque = new Rectangle(0,0,WINDOW_WIDTH,WINDOW_HEIGHT);
   opaque.setOpacity( 0 );
   outerGroup.getChildren().add( opaque );
   outerGroup.setOnScroll(new ZoomHandler(innerGroup));