Flex Spark List Mouse Wheel Scroll Speed

Question

I have a component extending a Spark List, and when I scroll using the mouse wheel it scrolls too much in one go. I have tried looking for the handler that deals with mouse wheel scrolling in the List class and VerticalLayout class to override but I cannot find it.

Is there another way I'm supposed to change this, or am I missing something?

If your problem is only with me mousewheel: I've the same problem and still no solution :( stackoverflow.com/questions/3584127/… — hering
yeah its just mouse wheel scrolling, it moves about 3 times as much as normal scrolling and so looks inconsistent. otherwise its fine... Using the mx list I could do override protected function mouseWheelHandler() to change the speed, so I assumed there'd be something the same in the spark list... — Heather Roberts

Maria Sakharova Maria Sakharova · Accepted Answer · 2011-03-07T15:50:44

The "delta" property of MouseEvent.MOUSE_WHEEL defines how many lines will be scrolled by one wheel-scrolling. You could try changing it in the MOUSE_WHEEL handler (during capture phase). For example the following code will scroll line-by-line:

        protected function init(event:FlexEvent):void
        {
            list.addEventListener(MouseEvent.MOUSE_WHEEL, list_mouseWheelHandler, true);
        }

        protected function list_mouseWheelHandler(event:MouseEvent):void
        {
            event.delta = event.delta > 0 ? 1 : -1;
        }

Flex Spark List Mouse Wheel Scroll Speed

2 Answers