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@bitsgalore
Created January 31, 2017 13:43
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Minimal threaded GUI application with logging to both text file and ScrolledText widget
#! /usr/bin/env python
import time
import threading
import logging
try:
import tkinter as tk # Python 3.x
import tkinter.scrolledtext as ScrolledText
except ImportError:
import Tkinter as tk # Python 2.x
import ScrolledText
class TextHandler(logging.Handler):
# This class allows you to log to a Tkinter Text or ScrolledText widget
# Adapted from Moshe Kaplan: https://gist.github.com/moshekaplan/c425f861de7bbf28ef06
def __init__(self, text):
# run the regular Handler __init__
logging.Handler.__init__(self)
# Store a reference to the Text it will log to
self.text = text
def emit(self, record):
msg = self.format(record)
def append():
self.text.configure(state='normal')
self.text.insert(tk.END, msg + '\n')
self.text.configure(state='disabled')
# Autoscroll to the bottom
self.text.yview(tk.END)
# This is necessary because we can't modify the Text from other threads
self.text.after(0, append)
class myGUI(tk.Frame):
# This class defines the graphical user interface
def __init__(self, parent, *args, **kwargs):
tk.Frame.__init__(self, parent, *args, **kwargs)
self.root = parent
self.build_gui()
def build_gui(self):
# Build GUI
self.root.title('TEST')
self.root.option_add('*tearOff', 'FALSE')
self.grid(column=0, row=0, sticky='ew')
self.grid_columnconfigure(0, weight=1, uniform='a')
self.grid_columnconfigure(1, weight=1, uniform='a')
self.grid_columnconfigure(2, weight=1, uniform='a')
self.grid_columnconfigure(3, weight=1, uniform='a')
# Add text widget to display logging info
st = ScrolledText.ScrolledText(self, state='disabled')
st.configure(font='TkFixedFont')
st.grid(column=0, row=1, sticky='w', columnspan=4)
# Create textLogger
text_handler = TextHandler(st)
# Logging configuration
logging.basicConfig(filename='test.log',
level=logging.INFO,
format='%(asctime)s - %(levelname)s - %(message)s')
# Add the handler to logger
logger = logging.getLogger()
logger.addHandler(text_handler)
def worker():
# Skeleton worker function, runs in separate thread (see below)
while True:
# Report time / date at 2-second intervals
time.sleep(2)
timeStr = time.asctime()
msg = 'Current time: ' + timeStr
logging.info(msg)
def main():
root = tk.Tk()
myGUI(root)
t1 = threading.Thread(target=worker, args=[])
t1.start()
root.mainloop()
t1.join()
main()
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