添加标签后，滚动条在tkinter画布小部件中不起作用

Question

I have mad an app that ads label to the canvas. I have also set the vertical scrollbar. The problem is that I can not activate scrollbar, the scrollbar does not allow scrolling. I have used grid_propagate(0) but it still does not work. HOw to activate this feature? The program does not show me any error.

from tkinter import *

root=Tk()
frame=Frame(root,width=300,height=300)
frame.grid(row=0,column=0)
frame.grid_propagate(0)

canvas=Canvas(frame,width=300,height=300)

vbar=Scrollbar(frame,orient=VERTICAL)
vbar.grid(row=0, column=1,sticky="NS")
vbar.config(command=canvas.yview)

canvas.config(width=300,height=300)
canvas.config(yscrollcommand=vbar.set)
canvas.grid(row=0,column=0)

n=0
m=10
def novi():
    global n
    global m

    n +=1

    m=m+2

    e = Label(canvas, text=m )
    e.grid(row=n,column=0, padx=10, pady=10)

b = Button(root, text="add", command=novi)
b.grid(row=0, column=2,sticky="N")

root.mainloop()

Answer 1

You can try doing something like this:

1. Indicate the scrollregion of the canvas, example:

   canvas.config(scrollregion=(0,0, 940, 1200))

2. Indicate where to put your widget inside the canvas with a code similar to:

   canvas.create_window(x, y, window=here_goes_your_widget)

   In this example 'x' and 'y' are the coordinates.

---

As far as I know you must to manually indicate the position of the widget you want to put inside your canvas.

Well, I hope this serves as a help. Hasta la próxima, che!