Updated Silverlight Mouse Wheel Behavior
Posted Tuesday, August 25, 2009 by Nigel Sampson
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));
}
}
