1) Select same span in different subplots. 2) Call function when double click the selected span

[BryanWang0702]

Hello! I got two questions:

1. How can I use the span selector among all the subplots? I mean all the subplots should select the same span at the same time, I used for to add spanselector to each axes, but what I can only do is like the picture. So how can I select a span on the whole figure with one vline?
2. After I selected a span, can I call the function only when I double click the span I selected? Now I can only call the function once I release my mouse button.
   
   
   
   Here is the code I add SpanSelector to each axes with a for:

self.signal_span_selectors[i] = SpanSelector(
        self.signal_ax[i], onselect=self.update_signal_span,
        direction='horizontal', useblit=True,
        props=dict(alpha=0.5, facecolor='red'), interactive=True)