canvas.create_window not working? - user-interface

Question

I want to place a widget in my canvas.
I have written the following function to create a button and display it.
in the center of the x coordinate of my canvas.
def Button_Placer():
label1=Label(canvas, width =20, height = 2, font = font2, text="")
label1.pack()
def Show_Name():
name=NameGenerator()
label1.config(text=name)
button1=Button(canvas, text="Generate Name", width=20, height=4, font=font1, command=Show_Name)
button1=canvas.create_window(250, 300)
I have also created a canvas at the top:
canvas = Canvas(root, width=500, height = 500, bg="red")
canvas.pack()
Unfortunately the canvas.create_window does not work. .pack() works however is not what i need. I have looked at other examples however they are all off OOP and therefore do not find it relevant for my understanding.

Answer 1

As #CommonSense writes, try canvas.create_window(200, 200, window=button1).
Also; you create label1 inside a function and when the functioin exits the name label1 will be garbage collected.
When you create widgets on canvas the reference is an integer; the index of that widget on the canvas. If you use the widget name as reference for the canvas widget you lose the reference to the actual widget.
Try the example below:
from tkinter import *
root = Tk()
canvas = Canvas(root, width=500, height=500, bg="red")
canvas.pack()
def Show_Name():
name = 'A name' # No function NameGenerator()
label1.config(text=name)
button1 = Button(canvas, text="Generate Name", width=20, height=4,
command=Show_Name)
canvas_button1 = canvas.create_window(250, 300, window=button1)
label1 = Label(canvas, width=20, height=2, text="")
canvas_label1 = canvas.create_window(250, 200, window=label1)