How to make a Treeview column header into a Button?

Question

I am trying to improve the functionality of my GUI by adding buttons to the headings but can't find any examples or information on this one. Is there a way to make the headings into a clickable button in this example? The Treeview is going to be populated from a DB so, if I can get the buttons to work, it means I can order the display in a nicer way than having more buttons outside the "box".

import tkinter as tk
from tkinter import ttk

screen = tk.Tk() 
screen.title('This One')
screen.geometry('890x400')
style = ttk.Style()
style.theme_use("clam")
screen.grid_rowconfigure(1, weight=1)
screen.grid_columnconfigure(0, weight=1)

cols = ('TOKEN', 'F-500', 'F-250', 'F-100', 'F-24', 'POS','NEG')
box = ttk.Treeview(screen, columns=cols, show='headings')
for col in cols:
    box.heading(col, text=col)
    box.grid(row=1, column=0, columnspan=2,sticky='nsew')


box.column("TOKEN", width=95)
box.column("F-500", width=85, anchor='e')
box.column("F-250", width=85, anchor='e')
box.column("F-100", width=85, anchor='e')
box.column("F-24", width=85, anchor='e')
box.column("POS", width=75, anchor='center')
box.column("NEG", width=75, anchor='center')



closeButton = tk.Button(screen, text="Close", width=15, command=exit).grid(row=10, column=0)

screen.mainloop()

is `box.heading(col, text=col, command= lambda:print('hi'))` what you are asking for? — Thingamabobs, Sep 26 '20 at 10:41
For how lambda works follow this: https://stackoverflow.com/questions/16501/what-is-a-lambda-function/62742314#62742314 — Thingamabobs, Sep 26 '20 at 10:42
That is a start! that gives all the heading "buttons" a function but how would I get each one to have a seperate function? for example print("hi") when "token is clicked but print("bye") when f-500 is clicked... — Morty2, Sep 26 '20 at 10:52

score 0 · Accepted Answer · answered Sep 26 '20 at 10:49

The heading od the Treeview already are buttons with the optional keyword command. To use this in a forloop you can use lambda an annoynmous function.

import tkinter as tk
from tkinter import ttk

screen = tk.Tk() 
screen.title('This One')
screen.geometry('890x400')
style = ttk.Style()
style.theme_use("clam")
screen.grid_rowconfigure(1, weight=1)
screen.grid_columnconfigure(0, weight=1)

cols = ('TOKEN', 'F-500', 'F-250', 'F-100', 'F-24', 'POS','NEG')
box = ttk.Treeview(screen, columns=cols, show='headings')
for col in cols:
    if col == 'TOKEN':
        box.heading(col, text=col, command =lambda: print('token'))
    box.grid(row=1, column=0, columnspan=2,sticky='nsew')


box.column("TOKEN", width=95)
box.column("F-500", width=85, anchor='e')
box.column("F-250", width=85, anchor='e')
box.column("F-100", width=85, anchor='e')
box.column("F-24", width=85, anchor='e')
box.column("POS", width=75, anchor='center')
box.column("NEG", width=75, anchor='center')



closeButton = tk.Button(screen, text="Close", width=15, command=exit).grid(row=10, column=0)

screen.mainloop()

without using lambda:

def token():
    print('token')

cols = ('TOKEN', 'F-500', 'F-250', 'F-100', 'F-24', 'POS','NEG')
box = ttk.Treeview(screen, columns=cols, show='headings')
for col in cols:
    if col == 'TOKEN':
        box.heading(col, text=col, command =token)
    box.grid(row=1, column=0, columnspan=2,sticky='nsew')

I see!! Thanks for that, i just need to expand the if statement to include all the cols and then attach the functions! Thank you so much for your help! — Morty2, Sep 26 '20 at 10:57

How to make a Treeview column header into a Button?

1 Answers1