Hidetoshi NAGAI
6/26/2008 10:11:00 PM
From: "Harry Truax" <htruax@stf.com>
Subject: TK padx question
Date: Fri, 27 Jun 2008 02:45:22 +0900
Message-ID: <002601c8d7b4$b5db6a80$1e00000a@corp.stf.com>
> I was wondering if anyone knows how to specify a list of two values for
> :padx - I have been using ":padx=>5" for example, in positioning a button
> widget inside a frame that holds four buttons. I have been reading online
> that you can specify a list of two values when you want to pad on the left
> and right using different values.
There are some examples under "<ruby-src>/ext/tk/sample" directory.
For example, "demos-en/image3.rb" uses ":padx=>[0, '2m']".
Fundamentally, when Tcl/Tk requires a list of values,
please give an array on Ruby/Tk.
If the rule doesn't work, it must be a bug.
As a similar rule, when Tcl/Tk requires a list
"-option val -option val ...", please give a hash
{option=>val, option=>val, ...} on Ruby/Tk.
"font" option may be a good example.
-------------------------------------------------------------------
Tcl/Tk: button .b -font {Times 14 bold underline}
v
Ruby/Tk: TkButton.new(:font=>['Times', 14, 'bold', 'underline'])
TkButton.new(:font=>%w(Times 14 bold underline))
TkButton.new(:font=>['Times', 14, :bold, :underline])
# A symbol is converted to a string.
TkButton.new(:font=>"Times 14 bold underline")
# Tcl/Tk's list is a string, So this is also available.
Tcl/Tk: button .b -font {-family Times -size 14 -weight bold -underline true}
v
Ruby/Tk: TkButton.new(:font=>{:family=>'Times', :size=>14,
:weight=>'bold', :underline=>true])
TkButton.new(:font=>{'family'=>'Times', 'size'=>14,
'weight'=>'bold', 'underline'=>true])
# Both of a symbol and a string are available for keys.
TkButton.new(:font=>"-family Times -size 14 -weight bold -underline true")
# Of course, this is OK.
-------------------------------------------------------------------
--
Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)