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#!/usr/bin/env ruby
require 'tk'
TkLabel.new(:text=>"Please click the bottom frame").pack
f = TkFrame.new(:width=>400, :height=>100, :background=>'yellow',
:relief=>'ridge', :borderwidth=>5).pack
# TkPack.propagate(f, false) # <== important!!
f.pack_propagate(false) # <== important!!
list = (1..3).collect{|n|
TkButton.new(f, :text=>"button#{'-X'*n}"){
command proc{
puts "button#{'-X'*n}"
self.unpack
}
}
}
list.unshift(nil)
f.bind('1', proc{
w = list.shift
w.unpack if w
list.push(w)
list[0].pack(:expand=>true, :anchor=>:center) if list[0]
})
Tk.mainloop
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