/usr/lib/ruby/1.8/tk/button.rb is in libtcltk-ruby1.8 1.8.7.352-2ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# tk/button.rb : treat button widget
#
require 'tk'
require 'tk/label'
class Tk::Button<Tk::Label
TkCommandNames = ['button'.freeze].freeze
WidgetClassName = 'Button'.freeze
WidgetClassNames[WidgetClassName] = self
#def create_self(keys)
# if keys and keys != None
# tk_call_without_enc('button', @path, *hash_kv(keys, true))
# else
# tk_call_without_enc('button', @path)
# end
#end
#private :create_self
def invoke
_fromUTF8(tk_send_without_enc('invoke'))
end
def flash
tk_send_without_enc('flash')
self
end
end
#TkButton = Tk::Button unless Object.const_defined? :TkButton
Tk.__set_toplevel_aliases__(:Tk, Tk::Button, :TkButton)
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