private static void OnIsEnabledChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
var diagram = (RadDiagram)d;
if (e.OldValue != null)
{
ConnectionManipulationAutoScrollBehavior.DetachHandlers(diagram);
}
if (e.NewValue != null)
{
bool isEnabled = (bool)e.NewValue;
if (isEnabled)
{
ConnectionManipulationAutoScrollBehavior.AddAssosiation(diagram);
diagramInfos[diagram].ScrollingTimer.Tick += ScrollingTimer_Tick;
diagram.PreviewMouseMove += diagram_PreviewMouseMove;
}
else
{
ConnectionManipulationAutoScrollBehavior.DetachHandlers(diagram);
ConnectionManipulationAutoScrollBehavior.RemoveAssosiation(diagram);
}
}
}
static void diagram_PreviewMouseMove(object sender, MouseEventArgs e)
{
var diagram = (RadDiagram)sender;
var diagramInfo = diagramInfos[diagram];
if (IsAutoScrollingAllowed(diagramInfo))
{
diagramInfo.AutoScrollingDirection = ConnectionManipulationAutoScrollBehavior.GetScrollingDirection(diagram, e.GetPosition(diagram));
if (!diagramInfo.ScrollingTimer.IsEnabled && diagramInfo.AutoScrollingDirection != ScrollingDirection.None)
{
diagramInfo.ScrollingTimer.Start();
}
// if the auto scrolling is running cancel the default drag operation
if (diagramInfo.ScrollingTimer.IsEnabled)
{
e.Handled = true;
}
}
}
