Example 10-21. PP4E\Gui\Tools\threadtools-test-classes.py

tests thread callback queue, but uses class bound methods for action and callbacks

import time
from threadtools import threadChecker, startThread
from tkinter.scrolledtext import ScrolledText

class MyGUI:
def init(self, reps=3):
self.reps = reps # uses default Tk root
self.text = ScrolledText() # save widget as state
self.text.pack()
threadChecker(self.text) # start thread check loop
self.text.bind('', # 3.x need list for map, range ok
lambda event: list(map(self.onEvent, range(6))) )

def onEvent(self, i): # code that spawns thread
myname = 'thread-%s' % i
startThread(
action = self.threadaction,
args = (i, ),
context = (myname,),
onExit = self.threadexit,
onFail = self.threadfail,
onProgress = self.threadprogress)

thread's main action

def threadaction(self, id, progress): # what the thread does

Figure 10-12. Messages from queued callbacks

GUIs, Threads, and Queues | 645