I'm starting a GUI with haskell and gtk2hs. I've got a notebook widget and I want to switch pages with "F1, F2 ... F11" keys.
My working code is:
import Control.Monad.Trans (liftIO)
import Graphics.UI.Gtk
main = do
initGUI
builder <- builderNew
builderAddFromFile builder "M62.glade"
window <- builderGetObject builder castToWindow "window1"
notebook <- builderGetObject builder castToNotebook "notebook1"
window `on` keyPressEvent $ tryEvent $ do "F1" <- eventKeyName
liftIO $ notebookSetCurrentPage notebook 0
window `on` keyPressEvent $ tryEvent $ do "F2" <- eventKeyName
liftIO $ notebookSetCurrentPage notebook 1
window `on` keyPressEvent $ tryEvent $ do "F3" <- eventKeyName
liftIO $ notebookSetCurrentPage notebook 2
window `on` keyPressEvent $ tryEvent $ do "F4" <- eventKeyName
liftIO $ notebookSetCurrentPage notebook 3
window `on` keyPressEvent $ tryEvent $ do "F5" <- eventKeyName
liftIO $ notebookSetCurrentPage notebook 4
window `on` keyPressEvent $ tryEvent $ do "F6" <- eventKeyName
liftIO $ notebookSetCurrentPage notebook 5
window `on` keyPressEvent $ tryEvent $ do "F7" <- eventKeyName
liftIO $ notebookSetCurrentPage notebook 6
window `on` keyPressEvent $ tryEvent $ do "F8" <- eventKeyName
liftIO $ notebookSetCurrentPage notebook 7
window `on` keyPressEvent $ tryEvent $ do "F9" <- eventKeyName
liftIO $ notebookSetCurrentPage notebook 8
window `on` keyPressEvent $ tryEvent $ do "F10" <- eventKeyName
liftIO $ notebookSetCurrentPage notebook 9
window `on` keyPressEvent $ tryEvent $ do "F11" <- eventKeyName
liftIO $ notebookSetCurrentPage notebook 10
onDestroy window mainQuit
widgetShowAll window
mainGUI
Is there betters and/or concises ways to do it? I've tried to handle it out of the 'main' but then only "F1" works. I don't see how to manage this boilerplate.
How about this:
This is hopelessly partial: there are two partial pattern matches that can throw an exception. But that's okay, because that's what
tryEvent
is for. At time of writing, all other answers involve registering many event handlers, whereas this one registers only one. This should have a (slight) performance advantage.