Copyright	Will Thompson and Iñaki García Etxebarria
License	LGPL-2.1
Maintainer	Iñaki García Etxebarria
Safe Haskell	Safe-Inferred
Language	Haskell2010

GI.Wnck.Callbacks

Contents

Description

Synopsis

Signals

LoadSurfaceFunction

Type for the callback on the (unwrapped) C side.

Arguments

= Text	`iconName`: an icon name as in the Icon field in a .desktop file for the icon to load.
-> Int32	`size`: the desired icon size.
-> Word32	`flags`: not defined to do anything yet.
-> Ptr ()	`data`: data passed to the function, set when the `LoadSurfaceFunction` has been set for the `Tasklist`.
-> IO Surface	Returns: it should return a <classname>cairo_surface_t</classname> of `iconName` at size `size`, or `Nothing` if no icon for `iconName` at size `size` could be loaded.

Specifies the type of function passed to wnck_tasklist_set_icon_loader().

Arguments

:: (HasCallStack, MonadIO m)
=> FunPtr C_LoadSurfaceFunction
-> Text	`iconName`: an icon name as in the Icon field in a .desktop file for the icon to load.
-> Int32	`size`: the desired icon size.
-> Word32	`flags`: not defined to do anything yet.
-> Ptr ()	`data`: data passed to the function, set when the `LoadSurfaceFunction` has been set for the `Tasklist`.
-> m Surface	Returns: it should return a <classname>cairo_surface_t</classname> of `iconName` at size `size`, or `Nothing` if no icon for `iconName` at size `size` could be loaded.

Given a pointer to a foreign C function, wrap it into a function callable from Haskell.

Wrap the callback into a GClosure.

Generate a function pointer callable from C code, from a C_LoadSurfaceFunction.

A convenience synonym for Nothing :: Maybe LoadSurfaceFunction.