From: "Brian Schröder" <ruby@...>
Date: 2004-12-09T20:43:04+09:00
Subject: Re: binding question

On Thu, 9 Dec 2004 10:02:30 +0900
Florian Gross <flgr@ccan.de> wrote:

> email55555 email55555 wrote:
> 
> > I am learning Tk from the book "Practical Programming in Tcl and Tk".
> > I try to translate the book's examples from Tcl to Ruby. (as exercice
> > for myself)
> > 
> > Here is one of kind example: (TCL)
> > 
> > foreach name {one two three four five} {
> >   label .$name -text $name -bg white
> >   pack .$name -side top
> > }
> > pack .five -before .one
> > 
> > [...]
> > So, what's your suggestion? Do not using array ? write them one by one ?
> > or ...
> > 
> > variables = %w[one two three four five].map {|e|
> > TkLabel.new(:text=>name, :bg=>'white') {pack(:side=>:top)}}
> > Tk.pack variable[4] :before=>variables[0]
> 
> Yes, I'd use an Array like in your sample. Tk is a bit more chaotic in 
> this matter which is probably why they are using variables instead.
> 
> You could also use a Hash like this:
> 
> labels = Hash.new
> %w[one two three four five].each do |name|
>    label = TkLabel.new(:text => name, :bg => 'white') do
>      pack(:side=>:top)
>    end
>    labels[name] = label
> end
> 
> Tk.pack(label["four"], :before => label["one"])
> 

Or even (Warning: Typed directly into the mail)


labels = %w[one two three four five].inject({}) { | result, name |
  result[name] = TkLabel.new(:text => name, :bg => 'white') do 
    pack(:side => :top)
  end
  result
}

Tk.pack(label["four"], :before => label["one"])


regards,

Brian

-- 
Brian Schr�der
http://www.brian-schroeder.de/