This page is part of Manuel Chakravarty's WWW-stuff.
The installation of Gtk+HS includes a configuration oracle whose name is
gtkhs-config. It is usually located in a binaries
directory, such as /usr/local/bin/ (the prefix depends on
the location into which the whole library has been installed). The
configuration oracle provides version information and the compiler
options needed to compile and link programs that import Gtk+HS. Given
such a program in a single module `Main.hs', we can compile and link as
follows (where $HC represents the executable of the Haskell
compiler):
$HC -o prgm `gtkhs-config --cflags --libs` Main.hs
Usually, however, when compilation and linking is separate, the output of
gtkhs-config --cflags
determines the compile flags, whereas
gtkhs-config --libs
gives the link flags. The configuration oracle understands the following flags:
--version pint the version of the current installation --cflags print the compile flags --libs print the link flags --prefix print the installation prefix
If support for gtkglarea and/or iHaskell is needed, the
arguments gtkglarea and iH, respectively, need
to be passed to gtkhs-config. Moreover, the Gtk+HS
installation needs to have been compiled including support for these two
features. If gtkhs-config is invoked without any argument,
it lists all features supported by the present installation.
An Example Application: The Boolean Editor
The Boolean Editor (in the module BoolEd) illustrates the use of
Gtk+HS for GUI programming in Haskell. It is an application that
supports the editing of Boolean files - i.e., files that contain either
False or True. While not terribly useful as
an application, the implementation of the Boolean Editor illustrates the
use of the GTK+ toolkit from Haskell and the implementation of important
concepts, such as maintaining global state in the application and the
synchronisation of multiple windows. In particular, note how the
Boolean Editor changes the contents of windows that edit the same file
in sync.
The use of the Boolean Editor as an example application is due to Havoc Pennington.
This page is part of Manuel Chakravarty's
WWW-stuff.
Last modified: Tue Sep 11 00:53:26 EST 2001