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README
fltkhs-demos
These are end-to-end demos of FLTKHS, a Haskell Binding to the FLTK GUI Library
Fltkhs-demos aims not only to show off the features of the FLTKHS but also serve as a way of learning the API by example. For more thorough documentation on the FLTKHS API please see the FLTKHS module of that package.
Installation
FLTKHS now bundles the FLTK source so all you need to do is:
> git clone http://github.com/deech/fltkhs-demos
> stack install --flag fltkhs:bundled
> stack exec fltkhs-arc
Learning The API
Most of the demos are exact ports of those shipped in the 'test' directory of the distribution. It is hoped the user will study the Haskell demo code side-by-side with the C++ demo code in order to understand the API. The section API Guide in the FLKTHS documentation covers this in more detail.
Why is the demo code so un-Haskelly?
For being written in Haskell, the demo code is horrifyingly/amazingly imperative and stateful. Although it may repulse those who used to pure Haskell idioms it is that way for a reason.
The demo code was never meant to be idiomatic Haskell code but a way of showing as much of the API as possible. The API itself closely resembles the underlying C++ code which is imperative and stateful. This has the advantage of making the API easier to learn.
For instance, assuming FLTK was installed from source compare /src/Examples/arc.hs with /test/arc.cxx in the FLTK source directory. There is quite a bit of correspondence and it is easy to see how the Haskell API functions map to the C++ ones.
Fast Compilation Flag
This package comes with a flag fastCompile that is enabled by default and
speeds up compilation. More information on this flag is available under the
Compilation section of the FLTKHS documentation.
To disable this flag, tell Stack to ignore it during the configure step:
stack build --flag fltkhs-demos:-fastCompile --flag fltkhs:bundled
GHCi
Please see "Running In The Repl" 5 section of the FLTKHS documentation for more information.