在方法定义之外定义实例变量 (ruby)

发布于 2024-08-27 01:31:44 字数 557 浏览 5 评论 0原文

我正在为 Ruby Gosu 库开发（嗯，至少尝试）一个游戏框架。我制作了一个基本的事件系统，其中每个 Blocks::Event 都有一个处理程序列表，当事件被触发时，会调用这些方法。目前实现事件的方法如下：

class TestClass

    attr_accessor :on_close

    def initialize
        @on_close = Blocks::Event.new
    end

    def close
        @on_close.fire(self, Blocks::OnCloseArgs.new)
    end
end

但是这种实现事件的方法似乎相当长，我的问题是，我怎样才能找到一种方法，以便当有人想要在类中发生事件时，他们可以这样做

class TestClass

    event :on_close

    def close
        @on_close.fire(self, Blocks::OnCloseArgs.new)
    end
end

谢谢提前，呃。

原文

I am developing (well, trying to at least) a Game framework for the Ruby Gosu library. I have made a basic event system wherebye each Blocks::Event has a list of handlers and when the event is fired the methods are called. At the moment the way to implement an event is as follows:

class TestClass

    attr_accessor :on_close

    def initialize
        @on_close = Blocks::Event.new
    end

    def close
        @on_close.fire(self, Blocks::OnCloseArgs.new)
    end
end

But this method of implementing events seems rather long, my question is, how can I make a way so that when one wants an event in a class, they can just do this

class TestClass

    event :on_close

    def close
        @on_close.fire(self, Blocks::OnCloseArgs.new)
    end
end

Thanks in advance, ell.

分享到QQ

分享到微博

如果你对这篇内容有疑问，欢迎到本站社区发帖提问参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。

发布评论

需要登录才能够评论，你可以免费注册一个本站的账号。

葬心 2024-09-03 01:31:44

以下内容完全未经测试，但也许它可以帮助您入门：

class Blocks
  class Event
    # dummy 
  end
end

class Class
  def event(*args)
    define_method :initialize do
      args.each { |a| instance_variable_set("@#{a}", Blocks::Event.new) }
    end
  end
end

class TestClass
    event :on_close

    def close
      #@on_close.fire(self, Blocks::OnCloseArgs.new)
      p @on_close
    end
end

test = TestClass.new
test.close
# => #<Blocks::Event:0x10059a0a0>
p test.instance_variables
# => ["@on_close"]

根据 Banister 的评论进行编辑。

The following is completely untested, but maybe it gets you started:

class Blocks
  class Event
    # dummy 
  end
end

class Class
  def event(*args)
    define_method :initialize do
      args.each { |a| instance_variable_set("@#{a}", Blocks::Event.new) }
    end
  end
end

class TestClass
    event :on_close

    def close
      #@on_close.fire(self, Blocks::OnCloseArgs.new)
      p @on_close
    end
end

test = TestClass.new
test.close
# => #<Blocks::Event:0x10059a0a0>
p test.instance_variables
# => ["@on_close"]

Edited according to banister's comment.

回复收藏 0 原文

诠释孤独 2024-09-03 01:31:44

我不完全理解您要做什么，但您可以通过以下方式避免使用 initialize 方法：

class TestClass

    event :on_close

    def close
        @on_close ||= Blocks::Event.new
        @on_close.fire(self, Blocks::OnCloseArgs.new)
    end
end

||= 习惯用法让您可以延迟初始化ruby 中的实例变量。

I don't entirely understand what you're trying to do, but you can avoid using the initialize method in the following way:

class TestClass

    event :on_close

    def close
        @on_close ||= Blocks::Event.new
        @on_close.fire(self, Blocks::OnCloseArgs.new)
    end
end

The ||= idiom lets you lazily initialize instance variables in ruby.

回复收藏 0 原文

~没有更多了~