Hi All,
I wrote a small turn delivering graphical app that is supposed to
display turns in a queue.
If I instantiate the class and call its methods, thus displaying strings
in several canvases, from the interactive prompt, everything works fine.
If I do it when running the script as a programs, nothing gets displayed.
If I call mainloop() at the end of my program, everything gets
displayed, but then I cannot use my own function classes. This program
will never respond to events, but just get called from a "queue manager"
script for display...
Here's the code:
#!/usr/bin/env python
from __future__ import division
import Tkinter
import tkFont
from Tkconstants import *
from time import sleep
class TurnQueue(Tkinter.Frame):
def __init__(self, master=None, pw=60, ph=60, panels=4):
self.ph = ph
self.pw = pw
self.panels = panels
Tkinter.Frame.__init__(self, master)
self.createWidgets()
self.pack()
def createWidgets(self):
"""Create four canvases and a warning window."""
self.canvases = [Tkinter.Canvas(height=self.ph, width=self.pw,
borderwidth=1, background = '#FFFFFF') for i in range(self.panels)]
self.textbox_ids = []
# display them all, initialized
for i in self.canvases:
id = i.create_text(self.pw//2, self.ph//2, text='',
font=('bitstream charter', self.ph, 'bold'), fill='red')
self.textbox_ids.append(id)
i.pack()
def write_panel(self, panel_no, newtext):
"""writepanel(self, panel, newtext)
Set panel <panel> to text <newtext>"""
self.canvases[panel_no].itemconfigure(self.textbox_ids[panel_no],
text=newtext)
def read_panel(self, panel_no):
"""textcontents <- read_panel(self, panel_no)
Read panel text contents"""
return(self.canvases[panel_no].itemcget(self.textbox_ids[panel_no], 'text'))
def insert(self, turn_string):
"""Insert a new turn into the queue, move the rest upwards,
delete oldest."""
current_values = [self.read_panel(i) for i in
range(len(self.canvases))]
next_values = current_values[:]
next_values[:-1] = current_values[1:]
next_values[-1] = turn_string
# update all panel values
for i in range(len(self.canvases)):
self.write_panel(i, next_values[i])
if __name__ == "__main__":
myturns = TurnQueue(pw=200, ph=100, panels=4)
for i in range(100):
myturns.insert(str(i))
sleep(0.2)
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