title: How can I check if the event queue is finished for the on_pick event of matplotlib?
body: <p>I plotted a graph with matplotlib, and I want to interact with it when I clicked some of the points. I have many points overlapping on each other.</p>
  
  <pre><code>def foo():
      plist = list()
      data = data_generator()
      for ind in range(0, len(data)):
          x_plot, y_plot = generator()
          paths = ax.plot(x_plot, y_plot, alpha=alpha)
          plist.append(paths[0])
  
  class AbstractPlotPage(tk.Frame):
      def __init__():
          self.paths = foo()
          self.canvas = FigureCanvasTkAgg(f, self)
          self.canvas.mpl_connect('pick_event', self.on_pick)
          self.canvas.show()
      def on_pick():
          print('test')
  </code></pre>
  
  <p>The thing is, I noticed matplotlib does not run the on_pick once for all the overlapped points. But it runs once for a single points then run it again.</p>
  
  <p>So is there a way to check when the event queue is done? Or how can I watch this event queue?</p>