Developing a DSL Graphical Notation - Eclipse Modeling Project: A Domain-Specific Language Toolkit - page 97

Diagram Preferences

Our generated diagram code includes preference settings that are accessible from
the Eclipse preference dialog in a Mindmap Diagram category. Diagram general,
appearance, connection, ruler, grid, and printing preferences are all available
from a set of contributed preference pages. In our generated org.eclipse.
mindmap.diagram.preferences package is code that supports further exten-
sion and enables us to set defaults. For example, if we want all the mindmap
diagram lines to be blue by default, we can adjust our DiagramAppearance
PreferencePage class as follows:

public class DiagramAppearancePreferencePage

extends AppearancePreferencePage {

private static RGB LINE_COLOR = new RGB(90, 140, 255);

/**
* @generated
*/
public DiagramAppearancePreferencePage() {
setPreferenceStore(MindmapDiagramEditorPlugin.getInstance().
getPreferenceStore());

}

public static void initDefaults(IPreferenceStore store) {
AppearancePreferencePage.initDefaults(store);
PreferenceConverter.setDefault(store,
IPreferenceConstants.PREF_LINE_COLOR, LINE_COLOR);

}

}

We can set more preferences and add new preferences. Section 4.6.6, “Color
Preferences,” looks at how to modify code-generation templates to add custom
preferences for the color modeling diagram.

Audits and Metrics

GMF provides the capability to define OCL-based audits and metrics for the
domain and diagram models. Using the mapping definition model, we can define
diagram audits and metrics for both domain and notation model elements.
What's generated leverages the EMF Validation Framework. To begin, we open
our mindmap.gmfmap model in the editor, right-click on the Mapping element,
and add a new Audit Container child. To the container, add the two audit
rules in Table 4-9.