Python Tkinter binding child widgets

I would say that the best solution is to use bind_all. Within the bound function you first need to figure out which canvas the mouse is over (and/or, which canvas has the focus), and then you can scroll that canvas.

Here is an example of how you can set up multiple scrolling canvas and bind the mouse wheel to each. The way I would do this is to change bind_all on mouse enter of a frame containing the canvas.

I have it set up in a way that each frame and canvas will expand with the window and you can see how everything inside scrolls just fine no matter what your mouse is over inside of the frame.

Try this code and let me know what you think.

import tkinter as tkroot = tk.Tk()root.rowconfigure(0, weight=1)root.columnconfigure(0, weight=1)root.columnconfigure(1, weight=1)def on_mousewheel1(event):    canvas.yview_scroll(int(-1*(event.delta/120)), "units")def on_mousewheel2(event):    canvas2.yview_scroll(int(-1*(event.delta/120)), "units")def set_binds_canvas1(event):    frame.bind_all("<MouseWheel>", on_mousewheel1)def set_binds_canvas2(event):    frame2.bind_all("<MouseWheel>", on_mousewheel2)# setup for first canvasframe = tk.Frame(root)frame.rowconfigure(0, weight=1)frame.columnconfigure(0, weight=1)frame.grid(row=0,column=0, sticky="nsew")canvas = tk.Canvas(frame, scrollregion=(0,0,500,500))canvas.grid(row=0, column=0, sticky="nsew")lbl = tk.Label(canvas, text="Some random text!")entry = tk.Entry(canvas)txt = tk.Text(canvas)canvas.create_window((100, 100), window=lbl)canvas.create_window((100, 50), window=entry)canvas.create_window((350, 400), window=txt)vbar=tk.Scrollbar(frame, orient="vertical")vbar.grid(row=0, column=1, sticky="ns")vbar.config(command=canvas.yview)canvas.config(yscrollcommand=vbar.set)# setup for second canvasframe2 = tk.Frame(root)frame2.rowconfigure(0, weight=1)frame2.columnconfigure(0, weight=1)frame2.grid(row=0,column=1, sticky="nsew")canvas2 = tk.Canvas(frame2, scrollregion=(0,0,500,500))canvas2.grid(row=0, column=0, sticky="nsew")lbl2 = tk.Label(canvas2, text="Some random text!")entry2 = tk.Entry(canvas2)txt2 = tk.Text(canvas2)canvas2.create_window((100, 100), window=lbl2)canvas2.create_window((100, 50), window=entry2)canvas2.create_window((350, 400), window=txt2)vbar2=tk.Scrollbar(frame2, orient="vertical")vbar2.grid(row=0, column=1, sticky="ns")vbar2.config(command=canvas2.yview)canvas2.config(yscrollcommand=vbar2.set)frame.bind("<Enter>", set_binds_canvas1)frame2.bind("<Enter>", set_binds_canvas2)root.mainloop()