blocks|key|320666|text|xmonad是一个用Haskell编写的X11窗口管理器。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|320667|此外，看看各种Haskell+GUI+Libraries是如何实现的，可能会给出一些关于如何在Haskell中制作交互式程序的想法。|320668|entityMap|0|LINK|mutability|MUTABLE|url|http://xmonad.org/|1|http://www.haskell.org/haskellwiki/Applications_and_libraries/GUI_libraries^0|0|6|0|0|7|L|1|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@$A|Q|B|R|1|S]]|C|$]]|$1|D|3|E|5|6|7|T|8|@]|9|@$A|U|B|V|1|W]]|C|$]]|$1|F|3|-4|5|6|7|X|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]|N|$5|I|J|K|C|$L|O]]]]

<a href="http://xmonad.org/" rel="nofollow noreferrer">xmonad</a> is an X11 window manager written in Haskell.

Also, looking at how the various <a href="http://www.haskell.org/haskellwiki/Applications_and_libraries/GUI_libraries" rel="nofollow noreferrer">Haskell GUI Libraries</a> are implemented may give some ideas of how interactive programs are made in Haskell.

blocks|key|3068400|text|看看this+wikibooks+article，它是一个基本的wxHaskell教程。特别地，请参阅Events+section。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3068401|我建议在开始开发一个完全成熟的应用程序之前，花一些时间了解Haskell和FP，这样您就可以更熟悉Haskell，因为它与C%2B%2B有很大的不同|3068402|entityMap|0|LINK|mutability|MUTABLE|url|http://en.wikibooks.org/wiki/Haskell/GUI|1|http://haskell.org/haskellwiki/WxHaskell|2|http://en.wikibooks.org/wiki/Haskell/GUI#Events^0|2|M|0|W|9|1|1F|E|2|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@$A|S|B|T|1|U]|$A|V|B|W|1|X]|$A|Y|B|Z|1|10]]|C|$]]|$1|D|3|E|5|6|7|11|8|@]|9|@]|C|$]]|$1|F|3|-4|5|6|7|12|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]|N|$5|I|J|K|C|$L|O]]|P|$5|I|J|K|C|$L|Q]]]]

Take a look at <a href="http://en.wikibooks.org/wiki/Haskell/GUI" rel="nofollow noreferrer">this wikibooks article</a>, it's a basic <a href="http://haskell.org/haskellwiki/WxHaskell" rel="nofollow noreferrer">wxHaskell</a> tutorial. In particular see the <a href="http://en.wikibooks.org/wiki/Haskell/GUI#Events" rel="nofollow noreferrer">Events section</a>.

I recommend spending some quality time with Haskell and FP in general before jumping in to develop a fully-fledged application so you can get more familiarized with Haskell, since it's quite different from C++

blocks|key|3068407|text|xmonad是事件驱动的--请参见主事件处理循环，该循环从X服务器获取消息，并将其分派给纯功能代码，后者将状态呈现到屏幕上。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3068408|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

xmonad is event-driven -- see the main event handling loop, which takes messages from the X server, and dispatches to purely functional code, which in turn renders state out to the screen.

blocks|key|319689|text|下面是几个谷歌关键词：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|319690|319691|Functional+Reactive+Programming+(FRP)，是用于纯函数式语言的良好反应式(又称事件驱动)编程的编程范例，|unordered-list-item|offset|length|319692|Leksah，是用Haskell编写的Haskell+IDE，|319693|Yi，是一种类似Emacs的编辑器，它用Haskell取代Lisp作为实现、配置、定制和脚本语言，|319694|Super+Monao+Bros.+(是的，您猜对了，跳转&运行game)|319695|Frag+)(第一人称Shooter)|319696|Purely+Functional+Retrogames是关于如何用纯函数式语言编写游戏的4部分系列博客文章，以吃豆人为例进行了说明。(+Part+4.)|319697|、Part+2、Part+3|319698|entityMap|0|LINK|mutability|MUTABLE|url|http://google.com/search?q=Functional%2BReactive%2BProgramming|1|http://leksah.org/|2|http://haskell.org/haskellwiki/Yi|3|https://github.com/Mokehehe/Monao/|4|http://haskell.org/haskellwiki/Frag|5|http://prog21.dadgum.com/23.html|6|http://prog21.dadgum.com/26.html|7|http://prog21.dadgum.com/24.html|8|http://prog21.dadgum.com/25.html^0|0|0|0|11|0|0|0|6|1|0|0|2|2|0|0|H|3|0|0|4|4|0|0|S|5|1X|6|6|0|1|6|7|8|6|8|0^^$0|@$1|2|3|4|5|6|7|1H|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|1I|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|1J|8|@]|9|@$F|1K|G|1L|1|1M]]|A|$]]|$1|H|3|I|5|E|7|1N|8|@]|9|@$F|1O|G|1P|1|1Q]]|A|$]]|$1|J|3|K|5|E|7|1R|8|@]|9|@$F|1S|G|1T|1|1U]]|A|$]]|$1|L|3|M|5|E|7|1V|8|@]|9|@$F|1W|G|1X|1|1Y]]|A|$]]|$1|N|3|O|5|E|7|1Z|8|@]|9|@$F|20|G|21|1|22]]|A|$]]|$1|P|3|Q|5|E|7|23|8|@]|9|@$F|24|G|25|1|26]|$F|27|G|28|1|29]]|A|$]]|$1|R|3|S|5|6|7|2A|8|@]|9|@$F|2B|G|2C|1|2D]|$F|2E|G|2F|1|2G]]|A|$]]|$1|T|3|-4|5|6|7|2H|8|@]|9|@]|A|$]]]|U|$V|$5|W|X|Y|A|$Z|10]]|11|$5|W|X|Y|A|$Z|12]]|13|$5|W|X|Y|A|$Z|14]]|15|$5|W|X|Y|A|$Z|16]]|17|$5|W|X|Y|A|$Z|18]]|19|$5|W|X|Y|A|$Z|1A]]|1B|$5|W|X|Y|A|$Z|1C]]|1D|$5|W|X|Y|A|$Z|1E]]|1F|$5|W|X|Y|A|$Z|1G]]]]

Here's a couple of Google keywords for you:
<ul>
<li><a href="http://Google.Com/search?q=Functional+Reactive+Programming" rel="noreferrer">Functional Reactive Programming (FRP)</a>, a programming paradigm for, well reactive (aka event-driven) programming in purely functional languages,</li>
<li><a href="http://Leksah.Org/" rel="noreferrer">Leksah</a>, a Haskell IDE written in Haskell,</li>
<li><a href="http://Haskell.Org/haskellwiki/Yi" rel="noreferrer">Yi</a>, an Emacs-like editor which replaces Lisp with Haskell as the implementation, configuration, customization and scripting language,</li>
<li><a href="https://GitHub.Com/Mokehehe/Monao/" rel="noreferrer">Super Monao Bros.</a> (yes, you guessed it, a Jump&amp;Run game)</li>
<li><a href="http://Haskell.Org/haskellwiki/Frag" rel="noreferrer">Frag</a> (First-Person Shooter)</li>
<li><a href="http://Prog21.Dadgum.Com/23.html" rel="noreferrer">Purely Functional Retrogames</a> is a 4-part series of blog articles about how to write games in a purely functional language, explained using Pacman as the example. (<a href="http://Prog21.Dadgum.Com/24.html" rel="noreferrer">Part 2</a>, <a href="http://Prog21.Dadgum.Com/25.html" rel="noreferrer">Part 3</a>, <a href="http://Prog21.Dadgum.Com/26.html" rel="noreferrer">Part 4</a>.)</li>
</ul>

blocks|key|3281532|text|下面是一个使用epoll实现事件驱动的web服务器的示例：http://haskell.org/haskellwiki/Simple_Servers|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3281533|entityMap|0|LINK|mutability|MUTABLE|url|http://haskell.org/haskellwiki/Simple_Servers^0|T|19|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

Here's an example using epoll to implement an event driven web server: <a href="http://haskell.org/haskellwiki/Simple_Servers" rel="nofollow noreferrer">http://haskell.org/haskellwiki/Simple_Servers</a>

blocks|key|3281553|text|“函数式反应式编程”已经提过了，但是如果你是第一次看它，它可能看起来很复杂(如果你正在看一些高级文章，不管你学习了多久，它都会看起来很复杂：-)。然而，有一些非常好的文章可以帮助你理解它：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3281554|Conal+Elliott的|3281555|Composing+Reactive+Animations展示了一个用于描述动画的“组合器库”(函数式语言中的一种常见编程风格)。它从非常简单的示例开始，但也展示了第二个part.|unordered-list-item|offset|length|3281556|Yampa+Arcade中更有趣的“反应式”部分，它是函数式反应式编程的一个更进化的演示。它使用了一些高级的Haskell特性(如箭头)，但可读性仍然很强。让它实际运行可能会更复杂，但这是Paul+Hudak写的一本优秀的reading.|3281557|Haskell+School+of+Expression是一本教Haskell使用多媒体和图形(包括一些动画等)的书。这是一本很好的读物，但它需要更多的时间，因为它是一本完整的书：-)。|3281558|3281559|我通过F#找到了函数式编程的方法，与Haskell相比，它没有那么“纯粹”，但它让您可以完全访问.NET库，因此很容易从函数式语言中使用“真实世界”的技术。如果你感兴趣，在my+blog上有几个例子。|3281560|entityMap|0|LINK|mutability|MUTABLE|url|http://conal.net/fran/tutorial.htm|1|http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.65.8016&rep=rep1&type=pdf|2|https://rads.stackoverflow.com/amzn/click/com/0521644089|3|http://tomasp.net/blog/tag/28.aspx^0|0|0|0|T|0|0|0|C|1|0|0|S|2|0|0|2E|7|3|0^^$0|@$1|2|3|4|5|6|7|13|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|14|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|15|8|@]|9|@$G|16|H|17|1|18]]|A|$]]|$1|I|3|J|5|F|7|19|8|@]|9|@$G|1A|H|1B|1|1C]]|A|$]]|$1|K|3|L|5|F|7|1D|8|@]|9|@$G|1E|H|1F|1|1G]]|A|$]]|$1|M|3|-4|5|6|7|1H|8|@]|9|@]|A|$]]|$1|N|3|O|5|6|7|1I|8|@]|9|@$G|1J|H|1K|1|1L]]|A|$]]|$1|P|3|-4|5|6|7|1M|8|@]|9|@]|A|$]]]|Q|$R|$5|S|T|U|A|$V|W]]|X|$5|S|T|U|A|$V|Y]]|Z|$5|S|T|U|A|$V|10]]|11|$5|S|T|U|A|$V|12]]]]

"Functional reactive programming" was already mentioned, but it may seem complicated if you're looking at it for the first time (and if you're looking at some advanced articles, it will look complicated no matter how long have you studied it :-)). However, there are some very nice articles that will help you understand it:

<ul>
<li><a href="http://conal.net/fran/tutorial.htm" rel="nofollow noreferrer">Composing Reactive Animations</a> by Conal Elliott shows a "combinator library" (a common programming style in functional languages) for describing animations. It starts with very simple examples, but shows also more interesting "reactive" bit in the second part.</li>
<li><a href="http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.65.8016&amp;rep=rep1&amp;type=pdf" rel="nofollow noreferrer">Yampa Arcade</a> is a more evolved demo of Functional Reactive Programming. It uses some advanced Haskell features (such as Arrows), but is still very readable. Getting it to actually run may be more complicated, but it is an excellent reading.</li>
<li><a href="https://rads.stackoverflow.com/amzn/click/com/0521644089" rel="nofollow noreferrer" rel="nofollow noreferrer">Haskell School of Expression</a> by Paul Hudak is a book which teaches Haskell using multimedia and graphics (including some animations etc.). It is an excellent reading, but it takes more time as it is an entire book :-).</li>
</ul>

I find my way to functional programming through F#, which is a bit less "pure" compared to Haskell, but it gives you a full access to .NET libraries, so it is easy to use "real-world" technologies from a functional language. In case you were interested, there are a couple of examples on <a href="http://tomasp.net/blog/tag/28.aspx" rel="nofollow noreferrer">my blog</a>.

I've been looking at Haskell lately and it seems like a very nice way to watch programming problems from an alternative point of view - alternative to my usual imperative (I have a strong C++ background) view, at least.

However, all the articles I see seem to deal with the same kinds of programming problems:

<ul>
<li>Parsers</li>
<li>Compilers</li>
<li>Numeric computation problems</li>
</ul>

I'd like to give Haskell a try myself, by writing some GUI application. Hence, I'm wondering: does it make sense to write event-driven systems like GUIs in a functional programming language like Haskell? Or is that a problem domain at which imperative languages excel? Unfortunately it still takes quite some time for me to switch my mind to 'functional' mode, so I have a hard time deciding argueing against or in favor of using a functional programming language for an event-driven system.

I'd also be interested in examples of GUI applications (or event-driven systems, in general) which are implemented in Haskell.

Which event-driven applications are implemented in Haskell?

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我最近一直在研究Haskell，它似乎是从另一种观点来看待编程问题的一种非常好的方式-至少可以替代我通常的命令式(我有很强的C++背景)视图。然而，我看到的所有文章似乎都在处理相同类型的编程问题：的ParsersCompilersNumeric计算问题我想亲自试一试Haskell，通过编写一些GUI应用程序。因此，我想...

问在Haskell中实现了哪些事件驱动的应用程序？
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