Python tkinter threading trouble .delete(ALL)

Question

This may simply be the limitation of Tkinter being main thread op primarily. Is there a way to canvas.delete(ALL) in Tkinter when also using threads. I have the program running, the long way around because it won't do anything but write over what is already on the screen when I try to delete(ALL). If I try to eliminate self.line1, self.line2 concept of writing back over the line of text with the background color before replacing the line with the new value(like below) and replace it with delete(ALL) then the it doesn't do anything but write right back over the line and in time makes the value unreadable. Granted I do notice a bit of a tint of the original text still showing up on the screen with the way the code is written below.

Also, is there a short way of jumping out of the self.after loop once the child threads are all done running. I know I could easily create a massive if series of statements to test everything and then cause it to end when all is finished. Is there a short way though when you have 11 threads running that you would be testing through?

import os
import sys
import urllib
import tkinter as tk
import threading
import time

os.chdir ('/media')

class GUI(tk.Frame):
         def __init__(self,master):
                tk.Frame.__init__(self,master)
                self.DrawArea = tk.Canvas(self, width = 200, height = 250, background = 'black',
                              borderwidth = 0, highlightthickness = 0)
                self.DrawArea.grid(row=0, column=0, sticky="nsew")
                self.grid_rowconfigure(0, weight=1)
                self.grid_columnconfigure(0, weight=1)
                self.NxtNum0=0
                self.NxtNum1=0
                self.HiStr0=0
                self.HiStr1=0
                #find highest download video
                Hival = open("Highest.txt", "r") 
                self.HiStr = Hival.read()
                Hival.close()
                self.HiStr0 = str(int(self.HiStr)+1)
                self.HiStra = int(int(self.HiStr)/10000)

                #call download #0
                dl0 = threading.Thread(target = self.dl_0, name = 'dl0')
                dl0.start()

                #setup/call download #1
                self.HiStr1 = str(str(self.HiStra+1)+"0000")
                dl1 = threading.Thread(target = self.dl_1, name = 'dl1')
                dl1.start()

                self.line1=0
                self.line2=0
                self.real_time()

        def real_time(self):
                self.DrawArea.create_text(50,12,text = self.line1, fill = 'black')
                self.DrawArea.create_text(50,27,text = self.line2, fill = 'black')
                self.line1 = str(self.NxtNum0)
                self.line2 = str(self.NxtNum1)
                self.DrawArea.create_text(50,12,text = self.line1, fill = 'white')
                self.DrawArea.create_text(50,27,text = self.line2, fill = 'white')
                self.after(1000, self.real_time)

        def dl_0(self):
                self.NxtNum0 = int(self.HiStr0)
                while self.NxtNum0 < int(self.HiStr0)+100:
                        self.NxtNum0 +=1
                        time.sleep(.1)

        def dl_1(self):
                self.NxtNum1 = int(self.HiStr1)
                while self.NxtNum1 < int(self.HiStr1)+100:
                        self.NxtNum1 +=1
                        time.sleep(.1)


root = tk.Tk()
GUI(root).pack(fill = "both", expand = True)

Python tkinter threading trouble .delete(ALL)

Answers (1)

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