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Ruby Programming
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Simple Tk Application

A simple Tk application in Ruby might look something like this:

require 'tk'
root = TkRoot.new { title "Ex1" }
TkLabel.new(root) {
  text  'Hello, World!'
  pack  { padx 15 ; pady 15; side 'left' }
}
Tk.mainloop

Let's look at the code a little more closely. After loading in the tk extension module, we create a root-level frame using TkRoot.new. We then make a label widget as a child of the root frame, setting several options for the label. Finally, we pack the root frame and enter the main GUI event loop.

It's a good habit to specify the root explicitly, but you could leave it out---along with the extra options---and boil this down to a three-liner:

require 'tk'
TkLabel.new { text 'Hello, World!' }
Tk.mainloop

That's all there is to it! Armed with one of the Perl/Tk books we reference at the start of this chapter, you can now produce all the sophisticated GUIs you need. But then again, if you'd like to stick around for some more details, here they come.
Ruby Programming
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