Updated Silverlight Mouse Wheel Behavior
Silverlight 3 Behaviors
A while ago I showed how you could hook into the DOM's MouseWheel events and create a Behavior to attach Mouse Wheel scrolling to any ScrollViewer. You can read about it from the sidebar on the right.
Since then Silverlight 3 has been released and along with it we have Mouse Wheel support backed in, we can now build a much simpler Behavior to add Mouse Wheel functionality toScrollViewer. Here it is.
public class MouseWheelScrollBehavior : Behavior<ScrollViewer>
{
protected override void OnAttached()
{
base.OnAttached();
AssociatedObject.MouseWheel += OnMouseWheel;
}
protected override void OnDetaching()
{
base.OnDetaching();
AssociatedObject.MouseWheel -= OnMouseWheel;
}
private void OnMouseWheel(object sender, MouseWheelEventArgs e)
{
var offset = AssociatedObject.VerticalOffset;
AssociatedObject.ScrollToVerticalOffset(offset + (e.Delta * -0.5));
}
}
Comments
Kirupa (MS) - Tuesday, August 25, 2009
Hi Nigel - the SL mouse wheel only works on Windows. If you are running on a Mac, the SL mouse wheel implementation will not work. What you do gain is the ability to use the mouse wheel in full screen and (I think) out of browser mode.
A good tradeoff would be one where you use the DOM-based mouse wheel approach at all times and switch to the SL3 based version during offline and out of browser (again, not sure) modes =)
Cheers!
Kirupa
Kirupa (MS) - Tuesday, August 25, 2009
I should clarify - I meant, full screen instead of "offline" in the last sentence.
:-)
Nigel Sampson - Tuesday, August 25, 2009
Thanks for the heads up.
I'll revise it later.
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