タイマ習作

countdown_timer.rb

# -*- coding: utf-8 -*-
require 'gtk2'

class CountdownTimer
  def initialize(minutes, &block)
    @default_block = block
    reset(minutes, &block)
  end

  def expected_time
    @initial_time + (@initial_seconds - @remain_seconds)
  end

  def diff(expected, actual)
    h_diff = actual.hour - expected.hour
    m_diff = actual.min - expected.min
    s_diff = actual.sec - expected.sec
    h_diff * 3600 + m_diff * 60 + s_diff
  end

  def adjust(diff)
    @remain_seconds -= diff unless diff == 0
  end

  def start
    @initial_time = Time.now
    @th.run
  end

  def reset(minutes, &block)
    @initial_time = Time.now
    @remain_seconds = minutes * 60
    @initial_seconds = @remain_seconds
    block = @default_block unless block_given?

    block.call(@remain_seconds)
    @th = Thread.new do
      Thread.stop
      loop do
        d = diff(expected_time, Time.now)
        adjust(d)
        sleep(1)
        @remain_seconds -= 1
        block.call(@remain_seconds)
        break if @remain_seconds < 0
      end
    end
  end

  def join; @th.join; end
  def kill; @th.kill; end

  def self.to_minutes_string(seconds)
    min, sec = seconds.divmod(60)
    "#{sprintf('%02d', min)}:#{sprintf('%02d', sec)}"
  end
end

# window
window = Gtk::Window.new

# layout
vbox = Gtk::VBox.new(false, 5)
vbox.border_width = 10
window.add(vbox)
align = Gtk::Alignment.new(0.5, 0.5, 1, 1)
vbox.pack_start(align, false, false, 5)

# separator
separator = Gtk::HSeparator.new
vbox.pack_start(separator, false, false, 0)

# countdown_label
style = Gtk::Style.new
style.font_desc = Pango::FontDescription.new("Avenir Heavy 256")
style.set_fg(Gtk::STATE_NORMAL, 0, 0, 0)
#style.set_bg(Gtk::STATE_NORMAL, 0xff, 0xff, 0)
countdown_label = Gtk::Label.new
countdown_label.style = style
eventbox = Gtk::EventBox.new.add(countdown_label)
eventbox.style = style
align.add(eventbox)

# table
table = Gtk::Table.new(2, 3, false)
table.row_spacings = 5
table.border_width = 5
vbox.pack_start(table, false, true, 0)

# timer
timer = CountdownTimer.new(0.25) do |seconds|
  if seconds <= 0
    countdown_label.text = "ﾗｼﾞｵｯｽ!"
  else
    countdown_label.text = CountdownTimer.to_minutes_string(seconds)
  end
end


# start_button
start_button = Gtk::Button.new("Start")
start_button.signal_connect("clicked") { timer.start }
vbox.pack_start(start_button, false, false, 0)
start_button.can_default = true
start_button.grab_default

# clear_buton
clear_button = Gtk::Button.new("Clear")
clear_button.signal_connect("clicked") { timer.reset(0.1) }
vbox.pack_start(clear_button, false, false, 0)

# # close_button
# button = Gtk::Button.new("Close")
# button.signal_connect("clicked") {window.destroy}
# vbox.pack_start(button, false, false, 0)

window.show_all

window.signal_connect("destroy") do
  timer.kill
  Gtk.main_quit
end

Gtk.main
timer.join