From: David Bailey <david.bailey@...>
Date: 2006-03-28T04:58:00+09:00
Subject: Re: Callback For A Timer Event To Display Widget in Ruby/Tk

Hidetoshi NAGAI wrote:
> From: David Bailey <david.bailey@technologist.com>
> Subject: Callback For A Timer Event To Display Widget in Ruby/Tk
> Date: Mon, 27 Mar 2006 23:14:23 +0900
> Message-ID: <b5ce5324fa36899ba9344afc32efd04c@ruby-forum.com>
>> But, I have searched high and low, and I can not find out how to set up 
>> a callback for a timer event.  I just want to display a time string on 
>> the TkCanvas or TkTopLevel window once per second.  I have gone through 
>> a Perl/Tk reference book and I'm still having trouble figuring out how 
>> to "translate" this into Ruby/Tk.
> 
> For such case which is sensitive about interval time,
> I recommend TkRTTimer class ( available Ruby 1.8.3 or later).
> That is unique to Ruby/Tk.
> Please see "<ruby source>/ext/tk/sample/tkrttimer.rb".
> It shows the difference between TkTimer class and TkRTTimer class.
> ===========================================================================
> TkTimer :: TkTimer.new(inerval, -1, operation).start
> 
>    | operation |            | operation |            | operation |
>  --+-----------+------------+-----------+------------+-----------+--> 
> time-line
>                |  interval  |           |  interval  |
> 
> 
> TkRTTimer :: TkRTTimer.new(inerval, -1, operation).start
> 
>    | operation |         | operation |         | operation |
>  --+-----------+---------+-----------+---------+-----------+--------> 
> time-line
>    |       interval      |       interval      |       interval
> 
> # argument '-1' means infinite loop
> ===========================================================================

Kind Responder,

Thank you very much.  I am forever grateful.

David

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