public override void CommitDrag(Point dragTerminationPoint, Point offset)
{
// This is really messy. This ought to be generalized somehow.
// If the drag ended over a layer icon, then perform a layer membership operation
IEnumerable <LayerIcon> occludedLayerIcons = Utility.DrawingAids.FindOccludedIcons <LayerIcon>(Designer.LayerIconsListBox,
Utility.DrawingAids.NormalizePoint(Designer.LayerIconsListBox, Designer.IconSurface, dragTerminationPoint));
if (occludedLayerIcons.Count() > 0)
{
CancelDrag();
LayerIcon layerIcon = occludedLayerIcons.First();
ViewModel.Layer layer = layerIcon.ReferencedObject as ViewModel.Layer;
if (layer.Members.Contains(ReferencedObject))
{
if (layer != Designer.DefaultLayer)
{
Designer.RemoveLayerMember(layer, ReferencedObject as ObjectModel.ITransitionEndpoint);
}
}
else
{
Designer.AddLayerMember(layer, ReferencedObject as ObjectModel.ITransitionEndpoint, layer.DefaultGroupStatus, (ReferencedObject as ObjectModel.ITransitionEndpoint).LeftTopPosition);
}
}
else
{
base.CommitDrag(dragTerminationPoint, offset);
}
}
protected override void OnEndDrag()
{
base.OnEndDrag();
if (CandidateLayerIcon != null)
{
CandidateLayerIcon.MembershipAction = LayerIcon.MembershipActions.None;
CandidateLayerIcon = null;
}
}
public override void Drag(Point mousePosition, Point offset)
{
base.Drag(mousePosition, offset);
if (CandidateLayerIcon != null)
{
CandidateLayerIcon.MembershipAction = LayerIcon.MembershipActions.None;
CandidateLayerIcon = null;
}
// If the mouse is over a layer icon, let the user know
IEnumerable <LayerIcon> occludedLayerIcons = Utility.DrawingAids.FindOccludedIcons <LayerIcon>(Designer.LayerIconsListBox,
Utility.DrawingAids.NormalizePoint(Designer.LayerIconsListBox, Designer.IconSurface, mousePosition));
if (occludedLayerIcons.Count() == 1)
{
LayerIcon layerIcon = occludedLayerIcons.First();
ViewModel.Layer layer = layerIcon.ReferencedObject as ViewModel.Layer;
if (layer.Members.Contains(ReferencedObject))
{
if (layer.IsDefaultLayer)
{
layerIcon.MembershipAction = LayerIcon.MembershipActions.Forbidden;
}
else
{
if ((ReferencedObject as LayeredPositionableObject).CurrentLayerPosition.Layer == layer &&
(ReferencedObject as LayeredPositionableObject).CurrentLayerPosition.GroupStatus == LayerPosition.GroupStatuses.Implicit)
{
layerIcon.MembershipAction = LayerIcon.MembershipActions.Forbidden;
}
else
{
layerIcon.MembershipAction = LayerIcon.MembershipActions.Remove;
}
}
}
else
{
layerIcon.MembershipAction = LayerIcon.MembershipActions.Add;
}
CandidateLayerIcon = layerIcon;
}
}