How to scroll two parallel text widgets with one scrollbar?

2
votes

I need to scroll a "line number" text widget and a "code" text widget simultaneously in an IDE I'm developing. How would I achieve this?

2
python-3.xtkinter
What have you tried? Have you tried having the scrollbar call a function that calls the yview method of your two widgets? - Bryan Oakley
@BryanOakley - I have set the scrollbar the scroll the "code" widgets using self.vsb=tk.Scrollbar(self,command=self.text.yview) . But I do not see how I can set the same for self.numb (the line number widget) without removing the scroll on self.text . - Hayden Ravenscroft

2 Answers

2
votes

[EDITED] It's really easy to do this in Tcl, so I figured it had to be possible to get a Tkinter equivalent of the following Tcl procedure:

proc rollon {boxes args} {
    foreach box $boxes {
        eval {$box yview} $args
     }
}

After a few failed efforts, I came up with this, which works:

#!/usr/bin/env python3
from tkinter import *
from tkinter import ttk
root = Tk()
def viewall(*args):
    global tx, tx2
    eval('tx.yview(*args)')
    eval('tx2.yview(*args)')
tx = Text(root, background='white', width = '20', height = '8')
tx2 = Text(root, background='white', width = '20', height = '8')
rolly = ttk.Scrollbar(root, orient=VERTICAL, command=viewall)
tx['yscrollcommand'] = rolly.set
tx2['yscrollcommand'] = rolly.set
tx.grid(row=0, column=0, sticky=(N, W, E, S))
tx2.grid(row=0, column=1, sticky=(N, W, E, S))
rolly.grid(row=0, column=2, sticky=(N, W, E, S))
root.mainloop()

Somebody who knows more Python than I do could probably figure out how to do this without listing the "yview" for each text widget separately, but this should get you going.

1
votes

My own solution, while not the best, was this: (Forgive the lack of context)

def scroller(self,*args):#Move me
    self.text.yview(*args)
    self.numb.yview(*args)
def on_textscroll(self, *args):#Move me
    self.vsb.set(*args)
    self.scroller('moveto', args[0])