static bool WasSelectableDescendantHitByMouse(GraphElement currentTarget, MouseDownEvent evt)
{
VisualElement targetElement = evt.target as VisualElement;
if (targetElement == null || currentTarget == targetElement)
{
return(false);
}
VisualElement descendant = targetElement;
while (descendant != null && currentTarget != descendant)
{
GraphElement selectableDescendant = descendant as GraphElement;
if (selectableDescendant != null && selectableDescendant.enabledInHierarchy && selectableDescendant.pickingMode != PickingMode.Ignore && selectableDescendant.IsSelectable())
{
Vector2 localMousePosition = currentTarget.ChangeCoordinatesTo(descendant, evt.localMousePosition);
if (selectableDescendant.HitTest(localMousePosition))
{
return(true);
}
}
descendant = descendant.parent;
}
return(false);
}