ENH: Incorperate key list into 1DStack plot and allow for grids

[CJ-Wright]

Would it be possible/what is the best way to include the key list into the 1DStack viewer? I would like to be able to include the keys in such a way as to know what lines go to which temperature/sample/arbitrary name/etc. A MPL legend probably isn't going to cut it, as there would be too many lines and would eclipse the data itself. Would it be possible to have the keys as ticks on the right hand side which match up to the data?

Also, in normal plt.plot images there is the ability to press g on the keyboard and get a grid on top of the data. Would it be possible to extend this to the 1DStack viewer?

I am more than happy to PR this, I just need to know where to look.

[tacaswell]

annotate is your friend here.

To get the default keybindings do

import matplotlib.backend_bases as mbb
dey key_press(event):
    return mbb.key_press_handler(event, event.ax.figure.canvas)

canvas.mpl_connect('key_press_event', key_press)

[tacaswell]

(modulo typos, it might be event.axes)

[CJ-Wright]

Can I just have the key_press function as a regular function or should I make it a method of something?

[tacaswell]

Look at how it is done in backend_bases. It is used there as a method of the base FigureManager class. Either one works.