fltkhs | Haskell bindings to FLTK GUI toolkit | Functional Programming library
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kandi X-RAY | fltkhs Summary
Fltkhs - A Haskell Binding to the FLTK GUI Library.
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QUESTION
I have installed version 8.6.5 of ghc
on my (Debian 9) system and that's the only version available (look below for the details). I'm trying to build this project: https://github.com/deech/fltkhs-themes-demo
So I've installed latest stack (Version 2.1.3, Git revision 636e3a759d51127df2b62f90772def126cdf6d1f (7735 commits) x86_64 hpack-0.31.2
) and try to compile the project:
ANSWER
Answered 2020-Mar-05 at 21:49Each Stackage resolver is tied to a specific GHC version. That being so, if you pick a resolver that uses a GHC version different from the one you have installed system-wide, Stack will install it regardless of the system-ghc
option. As the Stack FAQ puts it
Note that stack can only use a system GHC installation if its version is compatible with the configuration of the current project, particularly the resolver setting.
In your case, lts-15.0
uses GHC 8.8.2, as can be seen on its Stackage page. If you want to use your system's 8.6.5, you can switch the resolver to lts-14.27
, which at the moment is the most recent LTS that uses 8.6.5.
QUESTION
I'm trying to load an image into a fltkhs box widget and do some image processing on it and I'd like to get the coordinates when the mouse click on a point on the image.
I couldn't find any part of fltkhs that can handle mouse events. Anyone could give any suggestions?
...ANSWER
Answered 2017-Sep-28 at 23:29Glancing through the documentation yielded this page:
https://hackage.haskell.org/package/fltkhs-0.5.4.1/docs/Graphics-UI-FLTK-LowLevel-FL.html
It has a function with the following signature:
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