impl与内部类

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# and open the template in the editor.

#puts "Hello World"
include Java
include_class javax.swing.JFrame
include_class javax.swing.JPanel
include_class javax.swing.JButton
include_class java.awt.event.ActionListener
include_class javax.swing.JOptionPane
include_class java.awt.Color


#include_class java.awt.Container
class ButtonFrame < JFrame
  def initialize
    super "Hello world Swing"
    setTitle__method "Button"
    set_size(300,200)
    panel=ButtonPanel.new
    getContentPane().add(panel)
    set_default_close_operation JFrame::EXIT_ON_CLOSE
    set_visible true
  end
end



class ButtonPanel <JPanel
  def initialize
    super
    yellowbutton=JButton.new("Yellow")
    redbutton=JButton.new("Red")
    bluebutton=JButton.new("Blue")
    add(yellowbutton)
    add(redbutton)
    add(bluebutton)   
    yellowbutton.addActionListener ActionListener.impl{ setBackground(Color::YELLOW) }
    bluebutton.addActionListener ActionListener.impl{ 
setBackground(Color::BLUE) }
    redbutton.addActionListener ActionListener.impl{ setBackground(Color::RED) }
      end
#  class Color_T
#      include ActionListener
#      def initialize(c)
#        @c=c
#      end
#      def action_performed(event)
#           setBackground(@c)
#      
#      end
#  end

  
  
end
  ButtonFrame.new

在用class Color_T的时候，出现问题了，Color_T是内部类，但是setbackground是外部类的方法，在Java中这个不存在访问的问题。但是JRuby中出现问题了，但是我还不清楚问题如何解决

评论

2 楼 night_stalker 2009-08-23  

用 jruby 跑了下，swing 真慢 ……

something cool：

require 'cici'

app = Cici.app 'color me~~'

app.paint [300, 200] do |v|
  v.marginx = 20 # 左边距
  v.br           # 换一行得到点空间
  v.button('red')   { v.bkcolor = RGB[0xFF0000] }
  v.button('blue')  { v.bkcolor = RGB[0x0000FF] }
  v.button('yello') { v.bkcolor = RGB[0xFFFF00] }
end

app.message_loop

1 楼 night_stalker 2009-08-23  

ruby 的内部类不与实例绑定。自然不能调用外部类的实例方法。

可以改成

    ...
    redbutton.addActionListener Color_T.new(Color::RED, self)
  end # initialize

  class Color_T
    include ActionListener
    def initialize(c, obj)
      @c = c
      @obj = obj
    end
    def action_performed(event)
      @obj.setBackground(@c)
    end
  end
  ...

或者

    ...
    color_me_onpush Color::RED, redbutton
  end # initialize

  def color_me_onpush color, button
    button.addActionListener ActionListener.impl {
      setBackground(color)}
  end
  ...