gert <[email protected]> writes:
> After reading the docs and seeing a few examples i think this should
> work ?
> Am I forgetting something here or am I doing something stupid ?
> Anyway I see my yellow screen, that has to count for something :)
>
I have been using the following scheme:
- Pass the root object to the thread object when creating the object
- Define a event_handler: root.bind('<<SomeEvent>>', evt_handler) in
the main thread.
- When the thread has done something that the GUI part should now
about, signal an event in the thread:
root.event_generate('<<SomeEvent>>') (no other arguments)
- Call a method of the thread object in the event handler e.g. to get
some data from a queue object.
This ensures that only the main thread accesses Tkinter-related things.
from Tkinter import *
from threading import Thread
import Queue
import time
class Weegbrug(Thread):
def __init__(self, gui, file_name):
Thread.__init__(self)
self.gui = gui
self.queue = Queue.Queue()
self.file_name = file_name
def run(self):
while True:
with open(self.file_name, 'r') as f:
for line in f:
self.queue.put(line)
self.gui.event_generate('<<LineRead>>')
time.sleep(0.5)
def get_line(self):
return self.queue.get()
root = Tk()
v = StringVar()
v.set("00000")
w = Weegbrug(root, '/tmp/test.py')
def evt_handler(*args):
v.set(w.get_line())
root.bind('<<LineRead>>', evt_handler)
tx = Label(root, textvariable=v, width=100, bg="yellow", font=("Helvetica", 20))
tx.pack(expand=YES, fill=BOTH)
root.title("Weegbrug")
# root.overrideredirect(1)
# root.geometry("%dx%d+0+0" % (root.winfo_screenwidth(),
# root.winfo_screenheight()))
# Don't start before there's a handler installed
w.start()
root.mainloop()
Jani Hakala
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