Tkinter, ignore certain lines from a tcl file?-CodePudding

Basically, I just want to remove the mouse scrollwheel binding for scrolling in ttk.Treeview widget. And I found that a specific line in the file found in

Python.framework/Versions/3.9/lib/tk8.6/ttk/treeview.tcl

is responsible for it, that if removed, disables the mouse scrollwheel for scrolling the view:

ttk::copyBindings TtkScrollable Treeview

However, I don't want to affect the built-in files. My only solution was to create py2app bundle and delete the same line from the treeview.tcl inside the bundle. But is there a direct way to do this inside a script.py file without affecting the tcl file?

CodePudding user response：

You don't have to modify the original code. Tkinter's event handling mechanism is very robust. It's easy to prevent the default bindings from running, bind binding a function that returns the string "break". Returning "break" will prevent any other handlers in the widget's binding tags from being invoked.

Here's a short contrived example:

import tkinter as tk
from tkinter import ttk

root = tk.Tk()

tree = ttk.Treeview(root)
tree.pack(side="top", fill="both", expand=True)
for i in range(20):
    tree.insert("", "end", text=f"Item #{i 1}")

tree.bind("<MouseWheel>", lambda event: "break")
root.mainloop()

Note if you're on an x11 based system you might have to disable the bindings for <Button-4> and <Button-5> instead of <MouseWheel>.