Editing Squeak (section)

==User interface frameworks==
Squeak includes four [[user interface]] frameworks:
* An implementation of [[Morphic (software)|Morphic]], [[Self (programming language)|Self]]'s graphical [[direct manipulation interface]] framework. This is Squeak's main interface.
* Tile-based, limited [[visual programming language|visual programming]] scripting in [[Etoys (programming language)|Etoys]], based on Morphic.
* A novel, experimental interface called [[Tweak programming environment|Tweak]]. In 2001 it became clear that the Etoy architecture in Squeak had reached its limits in what the Morphic interface infrastructure could do. Hewlett-Packard researcher Andreas Raab proposed defining a "script process" and providing a default scheduling-mechanism that avoids several more general problems.<ref>{{cite web |url=http://tweakproject.org/ABOUT/FAQ/OriginalTweakMemo/ |title=Tweak: OriginalTweakMemo |publisher=Tweakproject.org |date=2001-07-06 |access-date=2011-06-12 |url-status=dead |archive-url=https://web.archive.org/web/20111002012532/http://tweakproject.org/ABOUT/FAQ/OriginalTweakMemo/ |archive-date=2011-10-02}}</ref> This resulted in a new user interface, proposed to replace the Squeak Morphic user interface in the future. Tweak added mechanisms of islands, asynchronous messaging, players and costumes, language extensions, projects, and tile scripting.<ref>{{cite web |url=http://tweakproject.org/TECHNOLOGY/Whitepapers/ |title=Tweak: Whitepapers |publisher=Tweakproject.org |access-date=2011-06-12 |url-status=dead |archive-url=https://web.archive.org/web/20111002012629/http://tweakproject.org/TECHNOLOGY/Whitepapers/ |archive-date=2011-10-02}}</ref> Its underlying object system is class-based, but to users, during programming (scripting), it acts like it is [[prototype-based programming|prototype-based]]. Tweak objects are created and run in Tweak project windows.
* A [[model–view–controller]] (MVC) interface was the primary UI in Squeak versions 3.8 and earlier. It derived from the original Smalltalk-80 user interface framework which first introduced and popularized the MVC architectural pattern.<ref>{{cite web |url=http://st-www.cs.uiuc.edu/users/smarch/st-docs/mvc.html |first=Steve |last=Burbeck |title=How to use Model-View-Controller (MVC) |publisher=St-www.cs.uiuc.edu |date=1997-04-04 |access-date=2011-06-12 |url-status=dead |archive-url=https://web.archive.org/web/20090801040629/http://st-www.cs.uiuc.edu/users/smarch/st-docs/mvc.html |archive-date=2009-08-01}}</ref> MVC takes its name from the three core classes of the framework. Thus, the term "MVC" in the context of Squeak refers to both one of the available user interface frameworks and the pattern the framework follows. MVC is still provided for those wishing to use this older type of interface.