Tk window and contents will not display

[Peter Otten]

Chris Hare wrote:

> 
> On Aug 14, 2010, at 5:49 PM, Peter Otten wrote:
> 
>> Chris Hare wrote:
>> 
>>> Thanks Peter.  I threw away what I started with and merged your code
>>> into my class:
>>> 
>>> class externalLoopDisplay:
>>> 
>>>    def show(self):
>>>        main.logging.debug("externalLoopDisplay.show:","start")
>>> 
>>>        self.window = Tk()
>>> 
>>>        self.btnClose = Button(self.window, text="Close",
>>>        command=self.window.destroy,
>>>        bg=backColor,highlightbackground=warnColor,
>>>        highlightcolor=okColor) self.btnClose.grid(row=0, column=2)
>>>        self.label = Label(self.window) self.label.grid(row=1, column=0,
>>>        columnspan=3)
>>>        dirName =  getRadarPath() + "/net" + str(netNumber.get()) # e.g.
>>>        .../Radar/net17/net17-YYYYMMDDHHMMSS.gif

> Thanks.  One final question if I may, how would you suggest I handle
> checking for new files and adding them to the list?  For example, if the
> loop is playing and a new image is added, how can I detect it and then
> refresh the list of file?
> 
> I am stuck on that part with this new approach.
> 
> Chris

Replacing

>>> self.imagefiles = glob.glob(dirName + "/*.gif")
>>> self.imagefiles = cycle(self.imagefiles)

with

self.imagefiles = image_cycler(os.path.join(dirname, "*.gif"))

where image_cycler() looks as follows

def image_cycler(pattern):
    while True:
        for fn in glob.glob(pattern):
            yield fn

would be the simplest way.

Peter