void TimeLineControl_DragOver(object sender, DragEventArgs e)
{
//throw new NotImplementedException();
TimeLineItemControl d = e.Data.GetData(typeof(TimeLineItemControl)) as TimeLineItemControl;
if (d != null)
{
if (Manager != null)
{
if (!Manager.CanAddToTimeLine(d.DataContext as ITimeLineDataItem))
{
e.Effects = DragDropEffects.None;
return;
}
}
e.Effects = DragDropEffects.Move;
//this is an internal drag or a drag from another time line control
if (DragAdorner == null)
{
_dragAdorner = new TimeLineDragAdorner(d, ItemTemplate);
}
DragAdorner.MousePosition = e.GetPosition(d);
DragAdorner.InvalidateVisual();
}
else
{//GongSolutions.Wpf.DragDrop
var d2 = e.Data.GetData("GongSolutions.Wpf.DragDrop");
if (d2 != null)
{
if (Manager != null)
{
if (!Manager.CanAddToTimeLine(d2 as ITimeLineDataItem))
{
e.Effects = DragDropEffects.None;
return;
}
}
e.Effects = DragDropEffects.Move;
if (DragAdorner == null)
{
//we are dragging from an external source and we don't have a timeline item control of any sort
Children.Remove(_tmpDraggAdornerControl);
//in order to get an adornment layer the control has to be somewhere
_tmpDraggAdornerControl = new TimeLineItemControl();
_tmpDraggAdornerControl.UnitSize = UnitSize;
Children.Add(_tmpDraggAdornerControl);
Canvas.SetLeft(_tmpDraggAdornerControl, -1000000);
_tmpDraggAdornerControl.DataContext = d2;
_tmpDraggAdornerControl.StartTime = StartDate;
_tmpDraggAdornerControl.InitializeDefaultLength();
_tmpDraggAdornerControl.ContentTemplate = ItemTemplate;
_dragAdorner = new TimeLineDragAdorner(_tmpDraggAdornerControl, ItemTemplate);
}
DragAdorner.MousePosition = e.GetPosition(_tmpDraggAdornerControl);
DragAdorner.InvalidateVisual();
}
}
DragScroll(e);
}
