2007-09-11

穿鞋上路

关键字: Shoes
Shoes是Ruby的一个简单的桌面程序库

下载Shoes，将shoes.exe加入path
看看Hello World例子hello.rb: 
Shoes.app do
 button "Press Me" do
  alert "Hello Shoes!"
 end
end

运行shoes hello.rb即可

再看看自带的计算器的例子: 
class Calc
  def initialize
    @number = 0
    @previous = nil
    @op = nil
  end

  def to_s
    @number.to_s
  end
  
  (0..9).each do |n|
    define_method "press_#{n}" do
      @number = @number.to_i * 10 + n
    end
  end

  def press_clear
    @number = 0
  end

  {'add' => '+', 'sub' => '-', 'times' => '*', 'div' => '/'}.each do |meth, op|
    define_method "press_#{meth}" do
      if @op
        press_equals
      end
      @op = op
      @previous, @number = @number, nil
    end
  end

  def press_equals
    @number = @previous.send(@op, @number.to_i)
    @op = nil
  end

end

number_field = nil
number = Calc.new
Shoes.app :height => 250, :width => 200, :resizable => false do
  background "#EEC".."#996", :radius => 5,
    :top => 2, :left => 2, :width => -4, :height => -4

  stack :margin => 4 do

    stack :margin => 8 do
      number_field = text "<b>#{number}</b>"
    end

    flow :width => 218, :margin => 4 do
      %w(7 8 9 / 4 5 6 * 1 2 3 - 0 Clr = +).each do |btn|
        button btn, :width => 46, :height => 46 do
          method = case btn
            when /[0-9]/: 'press_'+btn
            when 'Clr': 'press_clear'
            when '=': 'press_equals'
            when '+': 'press_add'
            when '-': 'press_sub'
            when '*': 'press_times'
            when '/': 'press_div'
          end
          
          number.send(method)
          number_field.replace "<b>#{number} </b>"
        end
      end
    end
  end

end

用Block、Closure的方式来开发桌面程序，代码非常的清晰简洁

Shoes目前支持OS X、XP、Vista、Debian、Ubuntu，跨平台做的也非常不错
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