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02_HelloWorld_TheObligatoryFirstProgram_InstallingTk.rb
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02_HelloWorld_TheObligatoryFirstProgram_InstallingTk.rb
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# coding: utf-8
# Copyright (C) 2019 Mark D. Blackwell.
require 'tk'
require 'tkextlib/tile'
module ::HelloWorld
module GraphicalHelper
def f_content
$f_content_private ||= begin
f = ::Tk::Tile::Frame.new root
f.grid sticky: :wnes
end
end
def root
$root_private ||= begin
tell_tk_which_encoding_to_use
::TkRoot.new
end
end
def weights_column_and_row_default_set_up(*args)
first = 0
args.reverse_each do |e|
::TkGrid.columnconfigure e, first, weight: 1
::TkGrid. rowconfigure e, first, weight: 1
end
nil
end
private
def tell_tk_which_encoding_to_use
::Tk::Encoding.encoding = ''.encoding
nil
end
end
end
module ::HelloWorld
module GraphicalObjects
def b_button
@b_button_private ||= begin
b = ::Tk::Tile::Button.new f_content
b.text 'Hello, world!'
b.grid
end
end
end
end
module ::HelloWorld
module Graphical
extend GraphicalHelper
extend GraphicalObjects
extend self
def main
f_content.padding '0 0 0 0'
weights_column_and_row_set_up
b_button
::Tk.mainloop
nil
end
private
def weights_column_and_row_set_up
weights_column_and_row_default_set_up f_content, root
nil
end
end
end
::HelloWorld::Graphical.main