Function _get_uniform_gridstate

lib/matplotlib/backend_bases.py:2540–2545

(ticks)

    # these bindings require the mouse to be over an Axes to trigger
    def _get_uniform_gridstate(ticks):
        # Return True/False if all grid lines are on or off, None if they are
        # not all in the same state.
        return (True if all(tick.gridline.get_visible() for tick in ticks) else
                False if not any(tick.gridline.get_visible() for tick in ticks) else
                None)

    ax = event.inaxes
    # toggle major grids in current Axes (default key 'g')