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To: python-list@python.org
From: Akira Li <4kir4.1i@gmail.com>
Subject: Re: Moving a window on the screen
Date: Sat, 08 Nov 2014 19:35:34 +0300
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"ast" <nomail@invalid.com> writes:

> Ok, thx, it works now with:
>
> import tkinter
> fen = tkinter.Tk()
>
> x=0
>
> def moveW():
>    global x
>    fen.geometry("200x200+%d+10"  %  x)
>    x = x + 10
>    if (x < 1200):
>        fen.after(50, moveW)
>
> moveW() 

In general, to avoid the start time "drift" [1], you could lock the
execution with a timer e.g., to move the window from left to right
*delta_x* pixels at a time every *period* ms [2]:

  #!/usr/bin/env python3
  from time import monotonic
  from tkinter import Tk
  
  def timer():
      return int(monotonic() * 1000) # milliseconds
  
  def call_repeatedly(period, function, *args):
      root.after(period - timer() % period, call_repeatedly, period,
                 function, *args) # schedule the next call
      function(*args)
  
  def move(delta_x, max_x, width=200, x=[0]):
      root.geometry("%dx50+%d+100"  %  (width, x[0]))
      x[0] += delta_x # poor man's object
      if x[0] > (max_x - width):
          root.destroy() # exit
  
  root = Tk()
  period = 20 # call every *period* milliseconds
  delta_x = 2 # how many pixels to move at a time
  root.after(period - period % timer(), call_repeatedly, period,
             move, delta_x, root.winfo_screenwidth())
  root.mainloop()
  

[1]: http://stackoverflow.com/questions/8600161/executing-periodic-actions-in-python#comment26637231_8600301
[2]: http://stackoverflow.com/questions/24174924/how-to-run-a-function-periodically-in-python


Akira