Name: cairo-appbase
Version: 0.4
Synopsis: A template for building new GUI applications using GTK and Cairo.
Description:
This template includes working callbacks to handle the File and Help
menus and File Save/Open dialogs, with dummy handlers for selecting
filenames and the Edit menu's Cut, Copy, and Paste. The main canvas uses
Cairo for graphics rendering, and includes example code from the cairo
package.
.
To build your own application on top of this, first grab the code. You
can either grab it from hackage with @cabal unpack cairo-appbase@, or
clone the git repo:
.
> git clone git://github.com/kfish/cairo-appbase.git
.
To add widgets, install glade from your distro system and run
@glade data/main.ui@. Save the resulting file in GtkBuilder format.
.
Note that you must run @cabal install@ to put the UI file in the correct
place for your application to pick it up. To modify the code, edit
@src/cairo-appbase.hs@. Hooking up functions to widgets is very simple: get
a widget by name (which you set in ui file), and hook one of its
signals (which you found in the Signals tab in glade) to an @IO ()@ action:
.
> cut1 <- get G.castToMenuItem "cut1"
> G.onActivateLeaf cut1 $ myCut
.
The template code includes a trivial definition of myCut:
.
> myCut :: IO ()
> myCut = putStrLn "Cut"
.
A real application will want to pass data to the callback. In C, this is
fairly tedious as you only have a single void * to pass to callbacks as
@user_data@, and applications typically do lots of marshalling and
unmarshalling to pass data around. In Haskell however, you can make
yourself a more complex callback handler and use a curried version of it
in each instance:
.
> cut1 <- get G.castToMenuItem "cut1"
> G.onActivateLeaf cut1 $ myComplexCut project phase 7
>
> ...
>
> myCut :: Project -> MoonPhase -> LuckyNumber -> IO ()
> myCut project phase num = do
> let selection = currentSelection project
> when (phase == Full) howl
> when (num /= 7) fail
> doActualCut selection
.
License: BSD3
License-file: LICENSE
Author: Conrad Parker, Johan Bockgård
Maintainer: conrad@metadecks.org
Category: Development
Cabal-Version: >= 1.8
Build-type: Simple
Data-Files: data/main.ui
flag splitBase
description: Use the split-up base package.
Executable cairo-appbase
if flag(splitBase)
build-depends:
base >= 3 && < 6
else
build-depends:
base < 3
Main-Is: cairo-appbase.hs
Hs-Source-Dirs: src
Build-Depends: glib, gtk, cairo
------------------------------------------------------------------------
-- Git repo
--
source-repository head
type: git
location: git://github.com/kfish/cairo-appbase.git