Difference between revisions of "LGtk"
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| + | [[Category:User interfaces]] |
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| − | == What is it? == |
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| − | LGtk is a |
+ | LGtk is a GUI Toolkit. |
| − | LGtk is built on Gtk2Hs. |
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| + | Main goals of LGtk: |
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| − | Most Haskellers would like to use a mature FRP-based API for creating graphical user interfaces. |
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| − | FRP may not be the best tool for special user interfaces, like interfaces which consists of buttons, checkboxes, combo boxes, text entries and menus only. |
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| − | LGtk has a lens-based API which fits better these user interfaces. |
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| + | * Provide a Haskell EDSL for declarative description of interactive graphical applications |
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| − | == Demo application == |
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| + | * Provide an API for custom widget design |
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| − | |||
| + | * Provide a playground for high-level declarative features like derived state-save and undo-redo operations and type-driven GUI generation |
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| − | You can try the demo application with the following commands: |
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| − | |||
| − | cabal install gtk2hs-buildtools |
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| − | cabal install lgtk |
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| − | lgtkdemo |
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| − | |||
| − | == Features == |
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| − | |||
| − | Features of lgtk-0.5 |
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| − | |||
| − | * The API is closed, you can safely use any constructs as long as you obey the documented laws. |
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| − | * Support for asynchronous events. Using LGtk is a safe way for writing multithreaded Gtk applications. |
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| − | |||
| − | == Examples == |
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| − | |||
| − | === Hello World === |
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| − | |||
| − | <haskell> |
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| − | main = runWidget $ label $ return "Hello World!" |
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| − | </haskell> |
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| − | |||
| − | <hask>return</hask> is neded because labels may be dynamic, see the next examples. |
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| − | |||
| − | === Copy === |
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| − | |||
| − | The following applications presents an entry and a label below. |
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| − | When a text is entered in the entry, the label is changed to the entered text. |
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| − | |||
| − | <haskell> |
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| − | main = runWidget $ action $ do |
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| − | r <- newRef "enter text here" |
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| − | return $ vcat |
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| − | [ entry r |
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| − | , label $ readRef r |
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| − | ] |
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| − | </haskell> |
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| − | |||
| − | <hask>action</hask> gives acces to a monad in which new references can be made by <hask>newRef</hask>. |
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| − | A crutial feature of LGtk is that you cannot change the value of references in this monad (you can read them though). |
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| − | |||
| − | <hask>action</hask> gives acces to a monad in which you can read references but no reference creation or write is possible. |
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| − | |||
| − | === Addition === |
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| − | |||
| − | Two entries of integers and a label which shows the sum: |
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| − | |||
| − | <haskell> |
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| − | main = runWidget $ action $ do |
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| − | r1 <- newRef (12 :: Integer) |
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| − | r2 <- newRef 4 |
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| − | return $ vcat |
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| − | [ entryShow r1 |
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| − | , entryShow r2 |
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| − | , label $ liftM2 (+) (readRef r1) (readRef r2) |
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| − | ] |
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| − | </haskell> |
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| − | |||
| − | === Complex examples === |
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| − | |||
| − | You can find a more complex examples in the source code of LGtk. |
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| − | More examples will be presented here also. |
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[[Image:Lgtkdemo.png]] |
[[Image:Lgtkdemo.png]] |
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| − | == |
+ | == Internal links == |
| + | Should be revised: |
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| − | LGtk is actively developed. The semantics is getting stable but it is not yet documented. |
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| + | * [[LGtk/Semantics]] |
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| − | TODO list: |
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| + | * [[LGtk/ADT_lenses]] |
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| + | == External links == |
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| − | * Add an efficient implementation for LGtk. LGtk has only a reference implementation currently. |
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| − | * Add support for styles (layout, colors, etc). |
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| − | * Support more Gtk constructs. |
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| + | * [http://hackage.haskell.org/package/lgtk Haddock documentation on HackageDB] |
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| + | * [https://github.com/divipp/lgtk GitHub repository] |
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| + | * [http://people.inf.elte.hu/divip/LGtk/LGtk.html Initial announcement] |
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| + | * [http://www.haskell.org/haskellwiki/LGtk haskell.org wiki page (this page)] |
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| + | Related Stackoverflow questions: |
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| − | == Changelog == |
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| + | * [http://stackoverflow.com/questions/16123588/what-is-this-special-functor-structure-called What is this special functor structure called?] |
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| − | === lgtk-0.5 === |
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| + | * [http://stackoverflow.com/questions/16769579/howto-abort-getchar-safely Howto abort getChar safely?] |
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| + | Reddit comments: |
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| − | * Do not use monadic lenses any more. |
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| − | * Support for asynchronous events. |
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| − | * Lazily created tabs. |
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| − | * Unactive tabs are really unactive (event handlers are detached). |
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| − | * File references watch the files. When the file changes, the GUI is updated. |
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| − | * References with inherent identity (makes defining auto-sensitive buttons easier) |
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| − | * Experimental support for colored buttons. |
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| − | * More examples in the demo application. |
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| − | * Lots of inner changes. |
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| − | |||
| − | |||
| − | == External links == |
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| + | * [http://www.reddit.com/r/haskell/comments/1cemr2/lgtk_lensbased_gtk_interface/ 15 April 2013] |
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| − | * You can find the current API documentation [http://hackage.haskell.org/package/lgtk at HackageDB]. |
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| + | * [http://www.reddit.com/r/haskell/comments/1cj0o6/lgtk_api_fixed/ 17 April 2013] |
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| − | * There is [http://hub.darcs.net/divip/lgtk a darcs repo on hub.darcs.net]. |
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| + | * [http://www.reddit.com/r/haskell/comments/1f5m5j/ann_lgtk_05/ 27 May 2013] |
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| + | * [http://www.reddit.com/r/haskell/comments/1fjerf/lens_chains_lgtk_semantics_first_part/ 2 June 2013] |
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| + | * [http://www.reddit.com/r/haskell/comments/25k9x1/ann_lgtk08/ 14 May 2014] |
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Latest revision as of 21:08, 22 July 2023
LGtk is a GUI Toolkit.
Main goals of LGtk:
- Provide a Haskell EDSL for declarative description of interactive graphical applications
- Provide an API for custom widget design
- Provide a playground for high-level declarative features like derived state-save and undo-redo operations and type-driven GUI generation
Internal links
Should be revised:
External links
- Haddock documentation on HackageDB
- GitHub repository
- Initial announcement
- haskell.org wiki page (this page)
Related Stackoverflow questions:
Reddit comments: