Using Python 3.6/tkinter on MacOS, I created a frame within a canvas and bound a scrollbar to it. This all works fine. The problem is when I try to snag MouseWheel events when the cursor is in the scrollable frame. I set up a binding:
main_window.bind("<MouseWheel>",on_mousewheel)
and created a short dummy event handler:
def on_mousewheel(event):
print(event.delta)
Every time I use the scroll wheel, Python responds with:
Traceback (most recent call last):
File "/Users/Gary/IPPS/opendb.py", line 160, in <module>
main_window.mainloop()
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/tkinter/__init__.py", line 1277, in mainloop
self.tk.mainloop(n)
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xff in position 0: invalid start byte
Here is the code:
from tkinter import *
def on_main_window_resize(event):
canvas.configure(scrollregion=canvas.bbox('all'))
def on_mousewheel(event):
print(event.delta)
main_window = Tk()
main_window.bind("<MouseWheel>",on_mousewheel)
canvas = Canvas(main_window, width=500, height=500)
canvas.pack(side=LEFT, fill=BOTH, expand=YES)
cust_scroll = Scrollbar(main_window, orient=VERTICAL, command=canvas.yview)
cust_scroll.pack(side=RIGHT, fill=Y, expand=NO)
cust_list = Frame(canvas)
canvas['yscrollcommand'] = cust_scroll.set
canvas.bind('<Configure>', on_main_window_resize)
canvas.create_window((0,0), window=cust_list, anchor=NW)
main_window.grid_columnconfigure(0, weight=1)
main_window.grid_rowconfigure(0, weight=1)
memberbuttons = list();
for member in range(1,20):
memberbutton = Button(cust_list, text="BUTTON", justify=LEFT, pady=2)
memberbutton.pack(side=TOP, fill=X)
main_window.mainloop()
Any ideas?
