internal void OnMouseDrop(MouseEventArgs e)
{
if (IsNodeDragging)
{
RefreshNodeDropLocation(e.Location);
if (!NodeDropLocation.IsEmpty && NodeDragDrop != null)
{
NodeDragDrop(MapView.Tree, NodeDropLocation);
}
MapView.Canvas.KeyDown -= Canvas_KeyDown;
}
dragObject = null;
NodeDropLocation = new DropLocation();
MapView.Canvas.Cursor = Cursors.Default;
}
private void RefreshNodeDropLocation(Point p)
{
DropLocation location = CalculateDropLocation(p);
if (!location.Equals(NodeDropLocation))
{
if (IsValidDropLocation(location))
{
NodeDropLocation = location;
MapView.Canvas.Invalidate();
}
else if (!NodeDropLocation.IsEmpty)
{
NodeDropLocation = new DropLocation();
MapView.Canvas.Invalidate();
}
}
}
private bool IsValidDropLocation(DropLocation location)
{
if (location.IsEmpty)
{
return(false);
}
foreach (MapNode n in MapView.Tree.SelectedNodes)
{
if (n == location.Parent)
{
return(false);
} //drop location is included in moved nodes
if (n.Parent == location.Parent)
{
if (n.Next != null && n.Next == location.Sibling && !location.InsertAfterSibling) //same location as present
{
return(false);
}
if (n.Previous != null && n.Previous == location.Sibling && location.InsertAfterSibling) //same location as present
{
return(false);
}
}
if (n.Pos == NodePosition.Root)
{
return(false);
} //can't move root
if (location.Parent.IsDescendent(n))
{
return(false);
} //can't move ancentor to child
}
return(true);
}
public bool Equals(DropLocation loc)
{
return loc.Parent == this.Parent && loc.Sibling == this.Sibling && loc.InsertAfterSibling == this.InsertAfterSibling;
}
private void RefreshNodeDropLocation(Point p)
{
DropLocation location = CalculateDropLocation(p);
if(!location.Equals(NodeDropLocation))
{
if(IsValidDropLocation(location))
{
NodeDropLocation = location;
MapView.Canvas.Invalidate();
}
else if(!NodeDropLocation.IsEmpty)
{
NodeDropLocation = new DropLocation();
MapView.Canvas.Invalidate();
}
}
}
private bool IsValidDropLocation(DropLocation location)
{
if (location.IsEmpty) { return false; }
foreach(MapNode n in MapView.Tree.SelectedNodes)
{
if(n == location.Parent) { return false; } //drop location is included in moved nodes
if (n.Parent == location.Parent)
{
if(n.Next != null && n.Next == location.Sibling && !location.InsertAfterSibling) //same location as present
{ return false; }
if(n.Previous != null && n.Previous == location.Sibling && location.InsertAfterSibling) //same location as present
{ return false; }
}
if (n.Pos == NodePosition.Root) { return false; } //can't move root
if (location.Parent.IsDescendent(n)) { return false; } //can't move ancentor to child
}
return true;
}
internal void OnMouseDrop(MouseEventArgs e)
{
if (IsNodeDragging)
{
RefreshNodeDropLocation(e.Location);
if (!NodeDropLocation.IsEmpty && NodeDragDrop != null)
{
NodeDragDrop(MapView.Tree, NodeDropLocation);
}
MapView.Canvas.KeyDown -= Canvas_KeyDown;
}
dragObject = null;
NodeDropLocation = new DropLocation();
MapView.Canvas.Cursor = Cursors.Default;
}
public bool Equals(DropLocation loc)
{
return(loc.Parent == this.Parent && loc.Sibling == this.Sibling && loc.InsertAfterSibling == this.InsertAfterSibling);
}
internal void NodeDragDrop(MapTree tree, DropLocation location)
{
mapCtrl.MoveNodes(location);
}
