private bool AcceptsElementInternal(GraphElement element, ref int proposedIndex, int maxIndex)
{
// TODO: we probably need a "Stackable" capability
return(element != null && !(element is Scope) &&
!(element is StackNode) && !(element is TokenNode) &&
!(element is Placemat) &&
(element.GetContainingScope() as Group) == null &&
AcceptsElement(element, ref proposedIndex, maxIndex));
}
protected new void OnMouseMove(MouseMoveEvent e)
{
if (!m_Active)
{
return;
}
if (m_GraphView == null)
{
return;
}
var ve = (VisualElement)e.target;
Vector2 gvMousePos = ve.ChangeCoordinatesTo(m_GraphView.contentContainer, e.localMousePosition);
m_PanDiff = GetEffectivePanSpeed(gvMousePos);
#if USE_DRAG_RESET_WHEN_OUT_OF_GRAPH_VIEW
// We currently don't have a real use case for this and it just appears to annoy users.
// If and when the use case arise, we can revive this functionality.
if (gvMousePos.x < 0 || gvMousePos.y < 0 || gvMousePos.x > m_GraphView.layout.width ||
gvMousePos.y > m_GraphView.layout.height)
{
if (!m_GoneOut)
{
m_PanSchedule.Pause();
foreach (KeyValuePair <GraphElement, Rect> v in m_OriginalPos)
{
v.Key.SetPosition(v.Value);
}
m_GoneOut = true;
}
e.StopPropagation();
return;
}
if (m_GoneOut)
{
m_GoneOut = false;
}
#endif
if (m_PanDiff != Vector3.zero)
{
m_PanSchedule.Resume();
}
else
{
m_PanSchedule.Pause();
}
// We need to monitor the mouse diff "by hand" because we stop positioning the graph elements once the
// mouse has gone out.
m_MouseDiff = m_originalMouse - e.mousePosition;
var groupElementsDraggedOut = e.shiftKey ? new Dictionary <Group, List <GraphElement> >() : null;
foreach (KeyValuePair <GraphElement, OriginalPos> v in m_OriginalPos)
{
GraphElement ce = v.Key;
// Protect against stale visual elements that have been deparented since the start of the manipulation
if (ce.hierarchy.parent == null)
{
continue;
}
if (!v.Value.dragStarted)
{
// TODO Would probably be a good idea to batch stack items as we do for group ones.
var stackParent = ce.GetFirstAncestorOfType <StackNode>();
if (stackParent != null)
{
stackParent.OnStartDragging(ce);
}
if (groupElementsDraggedOut != null)
{
var groupParent = ce.GetContainingScope() as Group;
if (groupParent != null)
{
if (!groupElementsDraggedOut.ContainsKey(groupParent))
{
groupElementsDraggedOut[groupParent] = new List <GraphElement>();
}
groupElementsDraggedOut[groupParent].Add(ce);
}
}
v.Value.dragStarted = true;
}
MoveElement(ce, v.Value.pos);
}
foreach (var edge in m_EdgesToUpdate)
{
UpdateEdge(edge);
}
// Needed to ensure nodes can be dragged out of multiple groups all at once.
if (groupElementsDraggedOut != null)
{
foreach (KeyValuePair <Group, List <GraphElement> > kvp in groupElementsDraggedOut)
{
kvp.Key.OnStartDragging(e, kvp.Value);
}
}
List <ISelectable> selection = m_GraphView.selection;
// TODO: Replace with a temp drawing or something...maybe manipulator could fake position
// all this to let operation know which element sits under cursor...or is there another way to draw stuff that is being dragged?
IDropTarget dropTarget = GetDropTargetAt(e.mousePosition, selection.OfType <VisualElement>());
if (m_PrevDropTarget != dropTarget)
{
if (m_PrevDropTarget != null)
{
using (DragLeaveEvent eexit = DragLeaveEvent.GetPooled(e))
{
SendDragAndDropEvent(eexit, selection, m_PrevDropTarget, m_GraphView);
}
}
using (DragEnterEvent eenter = DragEnterEvent.GetPooled(e))
{
SendDragAndDropEvent(eenter, selection, dropTarget, m_GraphView);
}
}
using (DragUpdatedEvent eupdated = DragUpdatedEvent.GetPooled(e))
{
SendDragAndDropEvent(eupdated, selection, dropTarget, m_GraphView);
}
m_PrevDropTarget = dropTarget;
selectedElement = null;
e.StopPropagation();
}