/// <summary>
/// Handles the dropping of a dragsource in this droptarget
/// </summary>
/// <param name="sender"></param>
/// <param name="args"></param>
void DropTargetBase_InternalDragSourceDropped(object sender, DropEventArgs args)
{
if (ShowHover)
{
// after this, start the hover-out animation on the droptarget
Animation.CreateDropTargetHoverOut(BoundingBorder).Begin();
}
// what if there are children?
if (MainContentControl.Children.Count > 0)
{
// get the current child (which is a dragsource by definition)
// and either switch it with the new child (if the parent of the new child
// is a valid droptarget for the current child - so it must have rights to
// be used as a droptarget to be able to make the switch!) or replace it
DragSource currentChild = (DragSource)MainContentControl.Children[0];
// if currentchild <> child you're dragging (else, we're just dropping our
// dragsource onto its own parent (droptarget)
if (currentChild != args.DragSource)
{
// is the new childs' parent (parent of parent of parent) a droptarget?
Panel firstParent = (Panel)VisualTreeHelper.GetParent(VisualTreeHelper.GetParent(args.DragSource));
if (firstParent != null)
{
// droptarget?
if (VisualTreeHelper.GetParent(firstParent) is DropTarget)
{
DropTarget newChildParentDropTarget = (DropTarget)VisualTreeHelper.GetParent(firstParent);
if (currentChild.DropTargets.Contains(newChildParentDropTarget) ||
currentChild.AllDropTargetsValid == true) // check for valid droptarget, or check if all droptargets are valid
{
// point needed for animation of the current child
Point from = new Point();
from = args.DragSource.getCurrentPosition();
// reset position of dragsource, so control is on top of ghost, right
// before actually moving it.
args.DragSource.ResetMyPosition();
// remove from current parent
((Panel)VisualTreeHelper.GetParent(args.DragSource)).Children.Remove(args.DragSource);
MainContentControl.Children.Clear();
MainContentControl.Children.Add(args.DragSource);
// move the current child, with or without an animation
if (currentChild.ShowSwitchReplaceAnimation)
{
// animation, from the current position to the new position
// current position = where the new child is now
// new position = where the new child was
// add the current child to its new position, then move it from the
// "current position" to 0, 0 (the new position)
newChildParentDropTarget.MainContentControl.Children.Add(currentChild);
//currentChild.AnimateOnSwitch(from);
Storyboard sb = currentChild.ReturnAnimateOnSwitch(from);
EventHandler handler = null;
handler = (send, arg) =>
{
sb.Completed -= handler;
// trigger external dragsourcedropped-event
TriggerDragSourceDropped(args.DragSource);
};
sb.Completed += handler;
sb.Begin();
}
else
{
// no animation
newChildParentDropTarget.MainContentControl.Children.Add(currentChild);
// trigger external dragsourcedropped-event
TriggerDragSourceDropped(args.DragSource);
}
}
else
{
// parent of the new child isn't a VALID droptarget. Depending on DropBehaviour, remove
// current child & set new one (replace-behaviour) or return the new child to
// its original position (disallow-behaviour)
if (RemoveElementDropBehaviour == RemoveElementDropBehaviour.Replace)
{
// reset position of dragsource, so control is on top of ghost, right
// before actually moving it.
args.DragSource.ResetMyPosition();
// remove from current parent
((Panel)VisualTreeHelper.GetParent(args.DragSource)).Children.Remove(args.DragSource);
MainContentControl.Children.Clear();
MainContentControl.Children.Add(args.DragSource);
// trigger external dragsourcedropped-event
TriggerDragSourceDropped(args.DragSource);
}
else
{
// drop is disallowed, return dragsource to original position
args.DragSource.ReturnToOriginalPosition();
// trigger external dragsourcedropped-event
TriggerDragSourceDropped(args.DragSource);
}
}
}
else
{
// parent of the new child isn't a droptarget. Depending on DropBehaviour, remove
// current child & set new one (replace-behaviour) or return the new child to
// its original position (disallow-behaviour)
if (RemoveElementDropBehaviour == RemoveElementDropBehaviour.Replace)
{
// reset position of dragsource, so control is on top of ghost, right
// before actually moving it.
args.DragSource.ResetMyPosition();
// remove from current parent
((Panel)VisualTreeHelper.GetParent(args.DragSource)).Children.Remove(args.DragSource);
MainContentControl.Children.Clear();
MainContentControl.Children.Add(args.DragSource);
// trigger external dragsourcedropped-event
TriggerDragSourceDropped(args.DragSource);
}
else
{
// drop is disallowed, return dragsource to original position
args.DragSource.ReturnToOriginalPosition();
// trigger external dragsourcedropped-event
TriggerDragSourceDropped(args.DragSource);
}
}
}
else
{
// reset position of dragsource, so control is on top of ghost, right
// before actually moving it.
args.DragSource.ResetMyPosition();
// remove from current parent
((Panel)VisualTreeHelper.GetParent(args.DragSource)).Children.Remove(args.DragSource);
MainContentControl.Children.Clear();
MainContentControl.Children.Add(args.DragSource);
// trigger external dragsourcedropped-event
TriggerDragSourceDropped(args.DragSource);
}
}
else
{
// reset position of dragsource, so control is on top of ghost, right
// before actually moving it.
args.DragSource.ResetMyPosition();
// trigger external dragsourcedropped-event
TriggerDragSourceDropped(args.DragSource);
}
}
else
{
// reset position of dragsource, so control is on top of ghost, right
// before actually moving it.
args.DragSource.ResetMyPosition();
// remove from current parent
((Panel)VisualTreeHelper.GetParent(args.DragSource)).Children.Remove(args.DragSource);
MainContentControl.Children.Clear();
MainContentControl.Children.Add(args.DragSource);
((DropTarget)VisualTreeHelper.GetParent((Panel)VisualTreeHelper.GetParent(VisualTreeHelper.GetParent(args.DragSource)))).Content = null;
this.Content = args.DragSource;
// trigger external dragsourcedropped-event
TriggerDragSourceDropped(args.DragSource);
}
}
