protected void OnMouseDown(MouseDownEvent e)
{
if (m_Active)
{
e.StopImmediatePropagation();
return;
}
m_Active = false;
m_Dragging = false;
m_AddedByMouseDown = false;
if (target == null)
{
return;
}
selectionContainer = target.GetFirstAncestorOfType <ISelection>();
if (selectionContainer == null)
{
return;
}
selectedElement = target.GetFirstOfType <GraphElement>();
if (selectedElement == null)
{
return;
}
// Since we didn't drag after all, update selection with current element only
if (!selectionContainer.selection.Contains(selectedElement))
{
if (!e.ctrlKey)
{
selectionContainer.ClearSelection();
}
selectionContainer.AddToSelection(selectedElement);
m_AddedByMouseDown = true;
}
if (e.button == (int)activateButton)
{
// avoid starting a manipulation on a non movable object
if (!selectedElement.IsDroppable())
{
return;
}
// Reset drag and drop
m_DragAndDropDelay.Init(e.localMousePosition);
m_Active = true;
target.TakeMouseCapture();
e.StopPropagation();
}
}