Graphical Modeling Framework Runtime - Eclipse Modeling Project: A Domain-Specific Language Toolkit - page 469

icon="icons/obj16/MindmapDiagramFile.gif"
name="Map"
eclass="Map"
kind="org.eclipse.gmf.runtime.emf.type.core.IHintedType">
<param name="semanticHint" value="Map"/>
</metamodelType>
<metamodelType
id="org.eclipse.mindmap.diagram.Topic"
icon="icons/obj16/MindmapDiagramFile.gif"
name="Topic"
eclass="Topic"

kind="org.eclipse.gmf.runtime.emf.type.core.IHintedType">
<param name="semanticHint" value="Topic"/>
</metamodelType>
</metamodel>
</extension>

Note that both the Map and Topic classes from our domain model are reg-
istered as metamodelType elements with unique ID, name, eclass, and
IHintedType kind attributes. The semanticHint parameter for each
metamodelType supports the mapping of each type with its corresponding
View and EditPart , as you will see in our viewProviders and
editpartProviders extensions. Later, you'll see how these metamodel ele-
ments are mapped to palette tools and, therefore, diagram graphical elements.
First, we need to complement our elementTypes contribution with an enumer-
ator that returns an IElementType instance for each of our declared
metamodelType IDs, as shown here in our MindmapElementTypes class.
IElementType is an interface that the GMF runtime uses to define types that
are displayed, created, edited, and destroyed. Each type has an associated icon,
display name, EClass , and EditHelper , and they all return an edit command
when provided an edit request.

public class MindmapElementTypes extends AbstractElementTypeEnumerator
{

public static final IElementType MAP =
getElementType("org.eclipse.mindmap.diagram.Map");
public static final IElementType TOPIC =
getElementType("org.eclipse.mindmap.diagram.Topic");

}

We need to add extension parser support for the diagram's notation model.
The runtime provides one, so we simply declare a contribution using the
GMFResourceFactory class for our editor extension mmd type.