1 Introduction

Most Haskellers would like to use a mature FRP-based API for creating graphical user interfaces.
I think 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.
LGtk has a lens-based API which fits better these user interfaces. LGtk is built on Gtk2Hs.

2 Blog entries

• Initial announcement, 15 April
  
• API correction, 17 April
  
• HaskellWiki entry, 27 May

3 Links

• HaskellWiki entry
  
• The library on HackageDB
• Darcs repo
• My home page

4 Demo application

You can try the demo application with the following commands:

cabal install gtk2hs-buildtools
cabal install lgtk
lgtkdemo

There are screenshots in the initial announcement.

5 Feedback

Every feedback is appreciated, especially the following:

• About the API
  • Would you like to read comparisons to other existing interfaces? Which ones?
  • If you are uncertain whether a concrete simple application can be expressed or not, please describe it.
  • Which other part do you feel uncertain?
• About the implementation
  • Do you have scalability / efficiency concerns? Please give concrete examples!
  • If you would use the library, which feature would you need the most?

You may comment on the reddit links of the individual blog entries, preferably on the last one.