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#!/usr/bin/env ruby
# frozen_string_literal: false
# This script generates a counter with start and stop buttons.
require "tk"
$label = TkLabel.new {
text '0.00'
relief 'raised'
width 10
pack('side'=>'bottom', 'fill'=>'both')
}
TkButton.new {
text 'Start'
command proc {
if $stopped
$stopped = FALSE
tick
end
}
pack('side'=>'left','fill'=>'both','expand'=>'yes')
}
TkButton.new {
text 'Stop'
command proc{
exit if $stopped
$stopped = TRUE
}
pack('side'=>'right','fill'=>'both','expand'=>'yes')
}
$seconds=0
$hundredths=0
$stopped=TRUE
def tick
if $stopped then return end
Tk.after 50, proc{tick}
$hundredths+=5
if $hundredths >= 100
$hundredths=0
$seconds+=1
end
$label.text format("%d.%02d", $seconds, $hundredths)
end
root = Tk.root
root.bind "Control-c", proc{root.destroy}
root.bind "Control-q", proc{root.destroy}
Tk.root.focus
Tk.mainloop
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