Have u checked the version of flash player plugin installed for IE?
Sent from my iPad
On 09-Feb-2012, at 5:26 PM, Wouter Schreuders <wschreud...@gmail.com> wrote:
> Hi All
>
>
> I've been having problems with the amount of scrolling that happens when you
> use the mouse-wheel with VScrollBar. I came up with two possible
> solutions(well actually my co-worked came up with the one and I came up with
> the other), one is to prevent the default behaviour of the mouseWheelChanging
> event. The other was to extend the vScrollbar class and overwrite some
> functionality inside it. Both implementations are below. The problem is that
> while both of these solutions work inside of firefox and chrome, they don't
> seem to work in IE9, I'm guessing that IE9 is somehow sending mouse-wheel
> events differently to the way it's done with the flashplayer in the other
> browsers.
>
> Has anyone encountered this before and know of a workaround?
>
> Thanks
>
> Wouter
>
> like so:
>
> ---------------------------------------MXML-------------------------------------------------
> <s:VScrollBar id="vScrollBar" viewport="{grpContent}"
> mouseWheelChanging="MouseWheelInhibitor.mouseWheelChangingHandler(event)" />
> --------------------------------------- AS
> -------------------------------------------------
> package za.co.briteblue.twentytwoseven.presentation.components
> {
> import mx.events.FlexMouseEvent;
>
> import spark.components.VScrollBar;
>
> public class MouseWheelInhibitor
> {
> public static function
> mouseWheelChangingHandler(event:FlexMouseEvent):void
> {
> // don't scroll by preventing default
> event.preventDefault();
> // est amount to scroll based on height of viewport.
> var delta:Number =
> VScrollBar(event.target).viewport.height / 20;
>
> if(event.delta < 0)
>
> VScrollBar(event.target).viewport.verticalScrollPosition += delta;
> else
>
> VScrollBar(event.target).viewport.verticalScrollPosition -= delta;
> }
> }
> }
>
> ----------------------------------- other solution extending the vscrollbar
> class -----------------------------------------
>
> package za.co.briteblue.twentytwoseven.presentation.components
> {
> import flash.events.Event;
> import flash.events.MouseEvent;
>
> import mx.core.IInvalidating;
> import mx.core.mx_internal;
> import mx.events.FlexMouseEvent;
>
> import spark.components.VScrollBar;
> import spark.core.IViewport;
> import spark.core.NavigationUnit;
> import spark.utils.MouseEventUtil;
>
> use namespace mx_internal;
>
> public class TTSVScrollBar extends VScrollBar
> {
> public function TTSVScrollBar()
> {
> super();
> }
>
> // @author: braam
> // overridden to prevent viewport forced validation with every
> vertical scroll position update.
> // when viewport is a datagrid, performance is terrible for
> mouse wheel scrolling.
> override mx_internal function
> mouseWheelHandler(event:MouseEvent):void
> {
> const vp:IViewport = viewport;
> if (event.isDefaultPrevented() || !vp || !vp.visible ||
> !visible)
> return;
>
> // Dispatch the "mouseWheelChanging" event. If
> preventDefault() is called
> // on this event, the event will be cancelled.
> Otherwise if the delta
> // is modified the new value will be used.
> var changingEvent:FlexMouseEvent =
> MouseEventUtil.createMouseWheelChangingEvent(event);
> if (!dispatchEvent(changingEvent))
> {
> event.preventDefault();
> return;
> }
>
> const delta:int = changingEvent.delta;
>
> var nSteps:uint = Math.abs(delta);
> var navigationUnit:uint;
> var scrollPositionChanged:Boolean;
>
> // Scroll delta "steps".
> navigationUnit = (delta < 0) ? NavigationUnit.DOWN :
> NavigationUnit.UP;
> for (var vStep:int = 0; vStep < nSteps; vStep++)
> {
> var vspDelta:Number =
> vp.getVerticalScrollPositionDelta(navigationUnit);
> if (!isNaN(vspDelta))
> {
> vp.verticalScrollPosition += vspDelta;
> scrollPositionChanged = true;
> // if (vp is IInvalidating)
> // IInvalidating(vp).validateNow();
> }
> }
>
> if (scrollPositionChanged)
> dispatchEvent(new Event(Event.CHANGE));
>
> event.preventDefault();
> }
> }
> }
>
