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def blocking_input_loop(figure, event_names, timeout, handler):

"""

Run *figure*'s event loop while listening to interactive events.

The events listed in *event_names* are passed to *handler*.

This function is used to implement `.Figure.waitforbuttonpress`,

`.Figure.ginput`, and `.Axes.clabel`.

Parameters

----------

figure : `~matplotlib.figure.Figure`

event_names : list of str

The names of the events passed to *handler*.

timeout : float

If positive, the event loop is stopped after *timeout* seconds.

handler : Callable[[Event], Any]

Function called for each event; it can force an early exit of the event

loop by calling ``canvas.stop_event_loop()``.

"""

if figure.canvas.manager:

figure.show() # Ensure that the figure is shown if we are managing it.

# Connect the events to the on_event function call.

cids = [figure.canvas.mpl_connect(name, handler) for name in event_names]

try:

figure.canvas.start_event_loop(timeout) # Start event loop.

finally: # Run even on exception like ctrl-c.

# Disconnect the callbacks.

for cid in cids:

figure.canvas.mpl_disconnect(cid)