Graphical Editing Framework: Difference between revisions

Revision as of 19:24, 1 March 2007

Revision as of 19:27, 1 March 2007

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View: For each element within the model, including connections, a View has to be implemented, using [[draw2d]]. In order to implement the view, an implementation of IFigure of the [[draw2d]] library has to be used.

== GEF Design patterns frequently ==

In addition to MVC, GEF developers/enthusiasts need to have a good under standing of [[Design Patterns]]. The most recurring design patterns under GEF are [[Factory_method_pattern|Factory]], [[Chain-of-responsibility pattern|Chain of responsibility]], [[Command pattern|Command]], [[Observer pattern|Observer]] and [[State pattern|State]]. These patterns are often mandatory under GEF, for instance EditPartFactory implementation. Certain aspects of GEF code can be correlated to these. The jargon (italicized text) is strictly GEF specific.

* Factory : Creating models from palette, creating <i>editparts</i> and creating figures

* Observer : Typically a controller ( read <i>editpart</i>) listening on Model and View.

* Chain of Responsibility : To decide which <i>EditPolicy</i> should handle a <i>Request</i>.

* State pattern: A typical example of which is opening editors for an input model .

Note that the usage of patterns is not restricted to those listed here.

== GMF and EMF ==