class_docstr: Instances of this class are delivered to items in a :class:`GraphicsScene <pyqtgraph.GraphicsScene>` via their mouseDragEvent() method when the item is being mouse-dragged. 
docstr: Returns True if this event is the first since a drag was initiated.
docstr_tok: ["Returns","True","if","this","event","is","the","first","since","a","drag","was","initiated","."]
code: def isStart(self):
      """Returns True if this event is the first since a drag was initiated."""
      return self.start
  
imports: import weakref
  from time import perf_counter
  from ..Point import Point
  from ..Qt import QtCore
label_desc: Use image node_id 16 for calling the MouseDragEvent obj's underlying member method code with example usage: obj.isStart() and returns: self