ruby--ruby/ext/tk/sample/tkrttimer.rb

#!/usr/bin/env ruby
# This script is a re-implementation of tktimer.rb with TkTimer(TkAfter) class.

require "tk"

root = TkRoot.new(:title=>'realtime timer sample')

f1 = TkFrame.new(:borderwidth=>2, :relief=>:ridge)
f1.pack(:side=>:bottom, :fill=>:both)
TkLabel.new(f1, :text=>'use TkTimer (TkAfter) class').pack(:anchor=>:center)
label1 = TkLabel.new(:parent=>f1, :relief=>:raised, 
                     :width=>10).pack(:fill=>:both)

f2 = TkFrame.new(:borderwidth=>2, :relief=>:ridge)
f2.pack(:side=>:bottom, :fill=>:both)
TkLabel.new(f2, :text=>'use TkRTTimer class').pack
label2 = TkLabel.new(:parent=>f2, :relief=>:raised, 
                     :width=>10).pack(:fill=>:both)

TkLabel.new(:text=>'Interval setting of each timer is 10 ms.', 
            :padx=>10, :pady=>5).pack

# define the procedure repeated by the TkTimer object
tick = proc{|aobj| #<== TkTimer object
  cnt = aobj.return_value + 1  # return_value keeps a result of the last proc
  label = aobj.current_args[0]
  label.text format("%d.%02d", *(cnt.divmod(100)))
  cnt #==> return value is kept by TkTimer object
      #    (so, can be send to the next repeat-proc)
}

timer1 = TkTimer.new(10, -1, [tick, label1])    # 10 ms interval
timer2 = TkRTTimer.new(10, -1, [tick, label2])  # 10 ms interval

timer1.start(0, proc{ label1.text('0.00'); 0 })
timer2.start(0, proc{ label2.text('0.00'); 0 })

b_start = TkButton.new(:text=>'Start', :state=>:disabled) {
  pack(:side=>:left, :fill=>:both, :expand=>true)
}

b_stop  = TkButton.new(:text=>'Stop', :state=>:normal) {
  pack('side'=>'left', 'fill'=>'both', 'expand'=>'yes')
}

b_start.command {
  timer1.continue
  timer2.continue
  b_stop.state(:normal)
  b_start.state(:disabled)
}

b_stop.command {
  timer1.stop
  timer2.stop
  b_start.state(:normal)
  b_stop.state(:disabled)
}

TkButton.new(:text=>'Reset', :state=>:normal) {
  command { timer1.reset; timer2.reset }
  pack(:side=>:right, :fill=>:both, :expand=>:yes)
}

ev_quit = TkVirtualEvent.new('Control-c', 'Control-q')
Tk.root.bind(ev_quit, proc{Tk.exit}).focus

Tk.mainloop