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#!/usr/bin/env ruby
# This script is a re-implementation of tktimer.rb with TkTimer(TkAfter) class.
require "tk"
# new notation :
# * symbols are acceptable as keys or values of the option hash
# * the parent widget can be given by :parent key on the option hash
root = TkRoot.new(:title=>'timer sample')
label = TkLabel.new(:parent=>root, :relief=>:raised, :width=>10) \
.pack(:side=>:bottom, :fill=>:both)
# define the procedure repeated by the TkTimer object
tick = proc{|aobj| #<== TkTimer object
cnt = aobj.return_value + 5 # return_value keeps a result of the last proc
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)
}
timer = TkTimer.new(50, -1, tick).start(0, proc{ label.text('0.00'); 0 })
# ==> repeat-interval : (about) 50 ms,
# repeat : infinite (-1) times,
# repeat-procedure : tick (only one, in this case)
#
# ==> wait-before-call-init-proc : 0 ms,
# init_proc : proc{ label.text('0.00'); 0 }
#
# (0ms)-> init_proc ->(50ms)-> tick ->(50ms)-> tick ->....
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 {
timer.continue
b_stop.state(:normal)
b_start.state(:disabled)
}
b_stop.command {
timer.stop
b_start.state(:normal)
b_stop.state(:disabled)
}
TkButton.new(:text=>'Reset', :state=>:normal) {
command { timer.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
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