GNUstep: What is it? gnustep.org

Transcription

1 GNUSTEP

2 GNUstep: What is it? A powerful object-oriented development environment: A set of cross-platform libraries for developing applications (text, graphic, script, web, etc.) Development tools and applications A free implementation of the OpenStep specifications A community :-)

3 Once upon a time... NeXT and SUN collaborated in 1994 to create an open API: OpenStep, extending on the famous NeXTSTEP environment and API Soon, SUN moved its focus on a new toy, and NeXT was brought by Apple in order to create MacOS X In the meantime, the Free Software Foundation started a free implementation of the OpenStep specification

4 What s interesting? GNUstep is crossplatform (Linux, *BSDs, Windows, OSX...) and compatible with Cocoa (Apple) Objective-C is a really nice, simple yet powerful language, and you can transparently reuse C libraries (and soon with gcc 4, C++ libraries as well) You ve got Distributed Objects for free! GNUstep provides really powerful development tools like GORM, that really speed-up the development

5 Languages Objective-C is the main language but bindings exists for other languages: Java, Ruby, Scheme, Smalltalk with some work, existing Cocoa bindings for other languages like PyObjC (Python) and CocoaCamel (Perl) could be ported.. any volunteers?

6 One-minute course on Objective-C

7 Objective-C?? A strict superset of the ANSI C -- a dozen new keywords and only one syntactic addition Simply provides what s needed to have real object-oriented features, not just class-oriented features: messages, late bindings, dynamic loading, introspection, categories, etc. Very inspired by Smalltalk! When I invented the term Object-Oriented, I didn t have C++ in mind -- Alan Kay

8 MyObject : NSObject { NSString* name; } - (NSString*) name; - (void) setname: (NSString*) str; + (void) print: (id) anobject with: (NSString*)

9 MyObject - (NSString*) name { return name; } - (void) setname: (NSString*) str { ASSIGN (name, str); } + (void) print: (id) anobject with: (NSString*) amessage { NSLog (@ %@: %@, amessage, anobject);

10 Usage MyObject* anobject = [[MyObject alloc] init]; [anobject Toto ]; [MyObject print: anobject My object s name is ]; My object s name is: Toto

11 GNUstep components

12 GNUstep s Architecture GNUstep Applications GNUstep Core Other Frameworks Application Kit (GUI) Foundation Kit (Base) Database Kit Graphics Backend (Back) Web Deployment StepTalk Scripting Native Graphics System Operating System... Hosting Operating System (Linux, BSD, MS Windows, OS X,...)

13 GNUstep Frameworks Foundation AppKit GDL2: EOF 4.5 clone SQLClient GSWeb : WebObjects clone StepTalk : script engine

14 Development process Developer Development Applications Gorm User Interfaces Development Tools Project Center Makefiles Make Environment (GNUstep-Make) Source Code GCC Make Legend Other Resources (Images, Sounds,...) Information Application GNUstep Foreign Slide level: Introduction GNUstep Overview, Stefan Urbanek, 2004

15 ProjectCenter The GNUstep IDE Manage your project s files (source code, images, etc.) Create the makefiles Give you a nice GUI to set up options..

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17 GORM GNUstep Object Relationship Modeller At first glance, it s just another GUI builder......with nice additions like guidelines, etc. But it s much more than that : it s really an object relation modeller a gorm file is the serialization of the object s graph Check a video demo on DevelopmentDemonstration.html or come to the GNUstep booth/ devroom for a demo

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19 Related projects

20 Frameworks Pantomime: mail management (pop3,imap,smtp..) NetClasses: asynchronous network library Addresses: address book management BookmarkKit: bookmark management Tryst: RendezVous implementation CameraKit: libgphoto wrapper SlideShowKit: includes slideshows in your application etc.

21 Applications Not many apps for the moment (around sixty), but growing fast Even with so few applications, you can experience the interest of having applications really cooperating (check the live CD or go the booth for a demo) examples...

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25 Desktops! Different projects to create a desktop based on GNUstep libraries: Backbone : the goal is to implement a NeXTSTEP-like desktop Étoilé, Garma : wants to push the enveloppe :)

26 LiveCD: GNUSTEP GNU a e e f t h c e S

27 Gallery

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32 Future

33 Future... Amelioration of the graphic backends (Cairo, OpenGL...) A better Windows backend more GNUstep applications and desktop-related stuff Better integration with KDE/GNOME

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