protected void OnMouseDown(MouseDownEvent e)
{
if (e.currentTarget is ISelectable)
{
if (base.CanStartManipulation(e))
{
if ((base.target as ISelectable).HitTest(e.localMousePosition))
{
GraphElement graphElement = e.currentTarget as GraphElement;
if (graphElement != null)
{
VisualElement parent = graphElement.shadow.parent;
while (parent != null && !(parent is GraphView))
{
parent = parent.shadow.parent;
}
GraphView selectionContainer = parent as GraphView;
if (graphElement.IsSelected(selectionContainer) && e.ctrlKey)
{
graphElement.Unselect(selectionContainer);
}
else
{
graphElement.Select(selectionContainer, e.shiftKey || e.ctrlKey);
}
}
}
}
}
}
