[Haskell-cafe] gtk2hs question - derive SettingsWindow from Window
cetin.sert at gmail.com
Fri Dec 12 15:03:01 EST 2008
For a network manager of sorts I'm working on, I want to derive a
SettingsWindowClass from the WindowClass present in Gtk2Hs:
I want (the) instance(s) of the SettingsWindowClass to have a field to store
1) Is it safe to do it like this?
class WindowClass self ⇒ SettingsWindowClass self where
settingsWindowGetSettings :: self → IO [ConnectionSetting]
settingsWindowSetSettings :: self → [ConnectionSetting] → IO ()
newtype SettingsWindow = SettingsWindow (Window,[ConnectionSetting])
mkSettingsWindow = SettingsWindow
unSettingsWindow (SettingsWindow o) = o
settingsWindowNew :: IO SettingsWindow
settingsWindowNew = do
win ← windowNew
return $ mkSettingsWindow (win,)
2) Is this a common practice in gtk2hs usage?
3) And will GC properly free the memory allocated for the Window object? How
is this ensured, do ForeignPtr's always call delete on the underlying C ptr
when they get garbage collected?
-------------- next part --------------
An HTML attachment was scrubbed...
More information about the Haskell-Cafe