Okay, so I have a for loop with a sleep command. I want the loop to continue
until it is told to stop. I want to tell it to stop when a list goes from
empty to having something. The problem is that when that loop starts, the
program pretty much stops with it. To make things harder, I really want that
to be it's own class, so I have to pass it the list that triggers the
stopping, but I can only pass it the list once. So I don't think it is
possible. But if this made sense to anyone, and you have a suggestion I
would love it. Heres the full code: (but at the bottom, the Open function is
really the only thing that matters)
from Tkinter import *
import time
class BusyBar(Frame):
def __init__(self, master=None, **options):
# make sure we have sane defaults
self.master=master
self.options=options
self.width=options.setdefault('width', 300)
self.height=options.setdefault('height', 20)
self.background=options.setdefault('background', 'white')
self.relief=options.setdefault('relief', 'sunken')
self.bd=options.setdefault('bd', 2)
#extract options not applicable to frames
self._extractOptions(options)
# init the base class
Frame.__init__(self, master, options)
self.incr=self.width*self.increment
self.busy=0
self.dir='right'
# create the canvas which is the container for the bar
self.canvas=Canvas(self, height=self.height, width=self.width, bd=0,
highlightthickness=0, background=self.background)
# catch canvas resizes
self.canvas.bind('<Configure>', self.onSize)
# this is the bar that moves back and forth on the canvas
self.scale=self.canvas.create_rectangle(0, 0,
self.width*self.barWidth, self.height, fill=self.fill, width = 0)
# label that is in the center of the widget
self.label=self.canvas.create_text(self.canvas.winfo_reqwidth() / 2,
self.height / 2, text=self.text,
anchor="c", fill=self.foreground,
font=self.font)
self.update()
self.canvas.pack(side=TOP, fill=X, expand=NO)
def _extractOptions(self, options):
# these are the options not applicable to a frame
self.foreground=pop(options, 'foreground', 'white')
self.fill=pop(options, 'fill', 'black')
self.interval=pop(options, 'interval', 30)
self.font=pop(options, 'font','arial 12')
self.text=pop(options, 'text', '')
self.barWidth=pop(options, 'barWidth', 0.2)
self.increment=pop(options, 'increment', 0.05)
# todo - need to implement config, cget, __setitem__, __getitem__ so
it's more like a reg widget
# as it is now, you get a chance to set stuff at the constructor but not
after
def onSize(self, e=None):
self.width = e.width
self.height = e.height
# make sure the label is centered
self.canvas.delete(self.label)
self.label=self.canvas.create_text(self.width / 2, self.height / 2,
text=self.text,
anchor="c", fill=self.foreground,
font=self.font)
def on(self):
self.busy = 1
self.canvas.after(self.interval, self.update)
def of(self):
self.busy = 0
def update(self):
# do the move
x1,y1,x2,y2 = self.canvas.coords(self.scale)
if x2>=self.width:
self.dir='left'
if x1<=0:
self.dir='right'
if self.dir=='right':
self.canvas.move(self.scale, self.incr, 0)
else:
self.canvas.move(self.scale, -1*self.incr, 0)
if self.busy:
self.canvas.after(self.interval, self.update)
self.canvas.update_idletasks()
def pop(dict, key, default):
value = dict.get(key, default)
if dict.has_key(key):
del dict[key]
return value
#if __name__=='__main__':
#-----------------------------IMPORTANT
STUFF-------------------------------------------------
def Open(root):
bb = BusyBar(root, text='Grabbing Definitions')
bb.pack(side=LEFT, expand=NO)
bb.on()
root.update_idletasks()
for i in range(0, 100):
time.sleep(0.1)
root.update()
bb.of()
and the Open fucntion is with I would be calling from another program.
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