public override void OnDrop(DragEventArgs e)
{
try
{
e.Effects = DragDropEffects.None;
this.UpdateFeedback(false, (DragEventArgs)null);
if (this.TargetItem != null)
{
if (this.DragDropContext != null)
{
IDropAction instance = DropActionFactory.CreateInstance(this.DragDropContext);
if (instance != null)
{
e.Effects = instance.HandleDrop(this.DragDropContext.Descriptor.ResultEffects);
}
}
}
}
finally
{
this.hittestResult = (StructureViewDragDropHandler.HittestResult)null;
e.Handled = true;
}
base.OnDrop(e);
}
private bool TryDrop(DragEventArgs e, TimelineDropEffects requestedEffects)
{
this.DragDropContext = new DragDropContext(e.Data, this.TargetItem, requestedEffects);
IDropAction instance = DropActionFactory.CreateInstance(this.DragDropContext);
if (instance != null)
{
return(instance.CanDrop(this.DragDropContext.Descriptor));
}
return(false);
}
private DragDropEffects ComputeDropEffects(DragEventArgs e)
{
TimelineDropEffects allowedEffects1 = TimelineDropEffects.None;
if ((this.HitTestResult & DropHitTestResults.UpperHalf) != DropHitTestResults.None)
{
allowedEffects1 = !this.TimelineItem.TimelineItemManager.SortByZOrder ? TimelineDropEffects.After : TimelineDropEffects.Before;
}
else if ((this.HitTestResult & DropHitTestResults.LowerHalf) != DropHitTestResults.None)
{
allowedEffects1 = !this.TimelineItem.TimelineItemManager.SortByZOrder ? TimelineDropEffects.Before : TimelineDropEffects.After;
}
if ((e.AllowedEffects & DragDropEffects.Copy) != DragDropEffects.None && this.IsCopyKeyState(e.KeyStates))
{
allowedEffects1 |= TimelineDropEffects.Copy;
}
if ((e.AllowedEffects & DragDropEffects.Move) != DragDropEffects.None)
{
allowedEffects1 |= TimelineDropEffects.Move;
}
if ((this.HitTestResult & DropHitTestResults.CenterHalf) != DropHitTestResults.None)
{
TimelineDropEffects allowedEffects2 = allowedEffects1 & ~(TimelineDropEffects.Before | TimelineDropEffects.After);
this.DragDropContext = new DragDropContext(e.Data, this.TimelineItem, allowedEffects2);
IDropAction instance = DropActionFactory.CreateInstance(this.DragDropContext);
if (instance != null && instance.CanDrop(this.DragDropContext.Descriptor))
{
return(this.DragDropContext.Descriptor.ResultEffects);
}
}
this.DragDropContext = new DragDropContext(e.Data, this.TimelineItem, allowedEffects1);
IDropAction instance1 = DropActionFactory.CreateInstance(this.DragDropContext);
if (instance1 != null && instance1.CanDrop(this.DragDropContext.Descriptor))
{
return(this.DragDropContext.Descriptor.ResultEffects);
}
this.DragDropContext.Descriptor.DisableDrop();
return(this.DragDropContext.Descriptor.ResultEffects);
}