Graphical Modeling Framework Runtime - Eclipse Modeling Project: A Domain-Specific Language Toolkit - page 471

PaletteFactory.Adapter provided by the runtime. Note the aforementioned
reference to the IElementType for our Topic domain element being passed as
a constructor argument to the GMF runtime's CreationTool class.

public class MindmapPaletteFactory extends PaletteFactory.Adapter {

@Override
public Tool createTool(String toolId) {
if (toolId.equals("Topic")) {
return new CreationTool(MindmapElementTypes.TOPIC);

}
return null ;

}

}

View Definition
As you learned earlier, the creation tool of the palette first creates a domain ele-
ment and then views using the view service. For this, we need to contribute to
the org.eclpse.gmf.runtime.diagram.core.viewProviders extension-
point. Below, we declare the contribution and our MindmapViewProvider
class, which we will need to implement.

<extension point="org.eclipse.gmf.runtime.diagram.core.viewProviders">
<viewProvider
class="org.eclipse.mindmap.diagram.providers.MindmapViewProvider">
<Priority name="Lowest"/>
</viewProvider>
</extension>

Our MindmapViewProvider extends the provided AbstractView
Provider and overrides the getNodeViewClass() and getDiagramView
Class() methods. These methods use the semanticHint parameters to return
the appropriate ViewFactory classes for the Topic node diagram, respectively.

public class MindmapViewProvider extends AbstractViewProvider {

private final Map<String, Class<?>> diagramMap = new
HashMap<String,
Class<?>>();

{

diagramMap.put(MindmapDiagramEditor.ID,
DiagramViewFactory. class );
}