def drag_start(self, event):
if self.component:
self.original_padding = self.component.padding
if hasattr(event, "bid"):
event.window.capture_blob(self, event.bid,
event.net_transform())
else:
event.window.set_mouse_owner(self, event.net_transform())
self._last_blob_pos = (event.x, event.y)
self.mouse_down_position = (event.x,event.y)
self.event_state = "dragging"
event.handled = True
ViewportPanTool.drag_start(self, event)
return
