From: michael libby <x@...>
Date: 2002-07-17T08:31:15+09:00
Subject: Re: TkText no -textvariable workaround?

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On Tuesday 16 July 2002 10:15, Peter Hickman wrote:
> The TkText widget however does not have this option, it makes little
> sense to have text 'This is the text' so what you have is...
[snipped examples]

The reason is partly due to underlying Tk code and not something we could 
just fix in Ruby (at least that's my understanding and PH says as much 
below-- please correct if wrong). More importantly TkText's "value" is not 
just text! I don't see it mentioned elsewhere in the thread, so I thought 
I better point it out.

TkText is a very powerful widget, including ability to insert pictures, use 
multiple fonts, colors, etc, and other properties that would be completely 
confounded by any attempt to tie the "value" to a string like TkLabel or 
TkEntry can do. TkText is almost misleading, maybe should be TkRichText. 
:)

> The Perl/Tk pocket reference from O'Reilly is a usefull reference, if
> somewhat terse. What you are seeing is more an artefact of Tk than Ruby.

I have never been disappointed using man pages at http://www.tcl.tk or with 
the sample scripts in RAA.

To Tom Sawyer's original problem, you'll have to bind to keystroke event or 
some other widget event to capture changes as they happen, if that is your 
intent.

sample code to demonstrate:
  require 'tk'
  r = TkRoot.new
  t = TkText.new(r).pack
  a = ""
  t.bind('Key', proc{|x| a << x.keysym_num.chr })
  r.bind('Button-1', proc{puts a})
  Tk.mainloop

Type into text block to generate a, press mouse button in text box to 
print. On my machine this generates errors on certain keystrokes, like 
Shift, because its keysym_num is out of range for chr -- however capital 
letters still work, just not smoothly. The proc{} could easily test for 
legal values -- and process things like delete or cursor movements, etc.

- -michael

- -- 
 ______Michael_C_Libby__{_x_(at)_ichimunki_(dot)_com_}______
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