happlets: "Haskell Applets" provides an event handler and a canvas for building simple GUI apps.

[ game, gui, library ] [ Propose Tags ]

This package is provides the Happlets API that is common to all Happlet back-end provider libraries. Along with this package, it is necessary to install a back-end library such as 'happlets-lib-gtk'. Currently Gtk+ version 2 with a Cairo-based canvas is the only back-end available. Gtk+ version 3, Xlib, SDL2, GLUT, and (possibly) Wayland back-ends are all feasible and may be implemented in the future.

The goal of the Happlets project is to allow you to create very simple, thread-safe applications that contain nothing more than a single window with a drawing canvas that can respond to user input events, like mouse clicks, key-presses, or frame animation events. The intention is to create a minimal programming platform for small, single-purpose graphical applications which simply displays some interactive graphic, for example a plot of some data, or a simple game. Naturally, the Happlet program can be arbitrarily complex, but it may be better to consider other, FRP-based solutions if managing events becomes too difficult.

A happlet back-end provider may provide additional widget API functions, but using these APIs will result in your applet being dependent on the specific back-end and will thus not be as portable as programming for the "happlets" package alone. Happlets aims to achieve a balance between being as minimal as possible, but still provide enough graphics drawing primitives to be useful for the widest range of possible applications.

The Gtk+ v2 back-end provider can be downloaded from this link:



  • Happlets
    • Happlets.Config
    • Happlets.Draw
      • Happlets.Draw.Color
      • Happlets.Draw.SampCoord
      • Happlets.Draw.Text
      • Happlets.Draw.Types2D
    • Happlets.Event
    • Happlets.GUI
    • Happlets.Initialize
    • Happlets.Provider


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Dependencies base (>=4.7 && <4.9), bytestring (>= && <, colour (>=2.0.0 && <3.0.0), containers (>= && <=, fail (>=4.7 && <5.0), lens (>= && <, linear (>=1.20.0 && <, mtl (>=2.2.0 && <=2.2.1), semigroups (>=0.16.0 && <0.19.0), text (>= && <=, time (>= && <=, transformers (>=0.1.1 && <0.5.0), unordered-containers (>= && <= [details]
License LicenseRef-AGPL
Copyright (C) 2017-2018 Ramin Honary, all rights reserved.
Author Ramin Honary
Maintainer RaminHAL9001@gmail.com
Category GUI, Game
Home page https://github.com/RaminHAL9001/happlets
Uploaded by RaminHonary at 2018-05-25T23:53:24Z
Distributions NixOS:
Downloads 753 total (2 in the last 30 days)
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Status Docs not available [build log]
All reported builds failed as of 2018-05-26 [all 3 reports]