RadioButtons and CheckButtons widgets support flexible layouts

The widgets.RadioButtons and widgets.CheckButtons widgets now support arranging buttons in different layouts via the new layout parameter. You can arrange buttons vertically (default), horizontally, or in a 2D grid by passing a (rows, cols) tuple.

See Radio Buttons Grid for a (rows, cols) example.

import matplotlib.pyplot as plt
import numpy as np
from matplotlib.widgets import CheckButtons

t = np.arange(0.0, 2.0, 0.01)
s0 = np.sin(2*np.pi*t)
s1 = np.sin(4*np.pi*t)
s2 = np.sin(6*np.pi*t)
s3 = np.sin(8*np.pi*t)

fig, axes = plt.subplot_mosaic(
    [['main'], ['buttons']],
    height_ratios=[8, 1],
    layout="constrained",
)

l0, = axes['main'].plot(t, s0, lw=2, color='red', label='2 Hz')
l1, = axes['main'].plot(t, s1, lw=2, color='green', label='4 Hz')
l2, = axes['main'].plot(t, s2, lw=2, color='blue', label='6 Hz')
l3, = axes['main'].plot(t, s3, lw=2, color='purple', label='8 Hz')
axes['main'].set_xlabel('Time (s)')
axes['main'].set_ylabel('Amplitude')

lines_by_label = {l.get_label(): l for l in [l0, l1, l2, l3]}

axes['buttons'].set_facecolor('0.9')
check = CheckButtons(
    axes['buttons'],
    labels=lines_by_label.keys(),
    actives=[l.get_visible() for l in lines_by_label.values()],
    layout='horizontal'
)

def callback(label):
    ln = lines_by_label[label]
    ln.set_visible(not ln.get_visible())
    fig.canvas.draw_idle()

check.on_clicked(callback)
plt.show()

(Source code, 2x.png, png)