(Vorschlag: Problembeschreibung, Weg, Lösung; ABER am besten überhaupt etwas.)

• the central elements in GEF applications
• controllers that specify how model elements are mapped to visual figures and how these figures behave in different situations
• usually create an EditPart class for every model element class
• nearly same class hierarchy for the EditParts as you have for your model

Three different types of EditParts:

• GraphicalEditParts: provide a graphical representation (figures) for their model
• ConnectionEditParts: connections between (two) GraphicalEditParts, they have a source and a target EditPart
• Connections are connected to ConnectionAnchors, which should be provided by the EditParts the ConnectionEditPart points to/comes from
• recommended way: each GraphicalEditPart that could be a source or a target for connections implements the NodeEditPart interface
• (we don't use: TreeEditParts, building trees of a model with SWT tree widgets)

Neccessary/important Methods to implement (as far as we know):

• “setModel (Object)”: store your model!!!! (delegate with super, test if model is of the correct type)
• “Object getModel”: needs not to be implementented, gives you the stored Model
• “List getModelChildren()”: children in your hierachy (model objects), the appropriate EditParts are created by the Faytory, mostly not the connections, but the objects that should be represented as GraphicalEditParts
• e.g. our Schema(-model) children are the roles (remark the connections are no children in view of the EditParts)
• “IFigure createFigure()” define which figure is to be created for this EditPart (e.g. no one for our Schema, ClassFigures/MethodFigures for our roles, ConnectionFigures for the ConnectionGEParts)
• ConnectionAnchor getSourceConnectionAnchor(ConnectionEditPart connection)
• ConnectionAnchor getTargetConnectionAnchor(ConnectionEditPart connection)
• ConnectionAnchor getSourceConnectionAnchor(Request request)
• ConnectionAnchor getTargetConnectionAnchor(Request request)
• we implement those four methods each as “return new ChopboxAnchor(getFigure());”