Connecting CTRL + Right Click to matplotlib FigureCanvasTkAgg

Question

I'm trying to bind CTRL + Right click to a matplotlib FigureCanvasTkAgg. So far, I used mpl_connect to change the state of a ctrl variable when the key is pressed and then checked if it was True when the user clicks on the figure. I was wondering if there was a way to do the same thing without having to use this "workaround". The list of event connections doesn't appear to handle compound events.

import tkinter as tk
import matplotlib.pyplot as plt
from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg

ctrl = False

def ctrlpressed(event):
    global ctrl
    if event.key == 'control':
        ctrl = True

def ctrlreleased(event):
    global ctrl
    if event.key == 'control':
        ctrl = False

def scrolled(event):
    if ctrl and event.button == 3:
        print(f'({event.xdata}, {event.ydata})')

root = tk.Tk()
root.geometry("600x800")

fig, ax = plt.subplots(facecolor="w")
ax.plot([1, 2], [1, 2], '-o')

canvas = FigureCanvasTkAgg(fig, master=root)
canvas.draw()
canvas.get_tk_widget().pack(fill=tk.BOTH, expand=True)

canvas.mpl_connect('key_press_event', ctrlpressed)
canvas.mpl_connect('key_release_event', ctrlreleased)
canvas.mpl_connect('button_press_event', scrolled)

root.mainloop()

Ah that's so simple and it works. Thanks, can you write an answer so I can accept it ? — Nevpzo
– Nevpzo, Commented May 28 at 14:11

acw1668 · Accepted Answer · 2025-05-28 14:32:38Z

4

According to the linked document on event handling, you can check the event.key to see whether Control key is pressed or not inside the mouse event handler scrolled():

def scrolled(event):
    if event.key == 'control' and event.button == 3:
        print(f'({event.xdata}, {event.ydata})')

answered May 28 at 14:32

acw1668

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