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selecting it and changing its Sort in the properties window In response, the ends of the connector should change to show various combinations of diamonds, arrowheads, and plain ends
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Figure 10-3: Standard Class Diagrams template has several separate types of association
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First, features such as connector ends, line thicknesses, colors, and so on are not governed by the shape maps, so we need to use custom code to change them For OnAssociatedPropertyChanged() to work, we must rst set it up by calling a static method of the connector We only need to do this once for the class it isn t necessary to set up an observer relationship separately for each instance We set it up like this:
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public partial class AssociationConnector { protected override void InitializeResources (StyleSet classStyleSet) { baseInitializeResources(classStyleSet); // don't forget! AssociationConnectorAssociateValueWith(thisStore, AssociationSortDomainPropertyId); }
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10: Advanced DSL Customization
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TIP Override InitializeResources to set up per-class relationships involving shapes or connectors
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Even though this is an instance method, it is called once for each shape or connector class when the package is loaded It s better to perform setups here than in a class initializer, because at this point all the required initializations will have been done In some cases it is necessary to set the Generates Double Derived ag for the shape or connector in the DSL de nition
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In this DSL de nition, AssociationConnector is the connector that will present Association relationships on the screen The argument AssociationSortDomainPropertyId identi es the Sort domain property of the relationship to which the connector is mapped Each property has a XXXDomainPropertyId Once this setup has been performed, OnAssociatedPropertyChanged() will be called whenever this domain property s value changes We write it in the same class:
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protected override void OnAssociatedPropertyChanged (PropertyChangedEventArgs e) { // Called for a change in any property, so we must discriminate: if ("Sort"Equals(ePropertyName)) { // OK; we know the type of domain property "Sort" from DSL Defn: switch ((AssociationSort)eNewValue) { // Set the arrowheads depending on the sort of association: case AssociationSortAggregation: thisDecoratorTo = null; thisDecoratorFrom = LinkDecoratorDecoratorEmptyDiamond; break; // and so on for other values and other properties
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} baseOnAssociatedPropertyChanged(e); }
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This method will be called on an instance of the connector whenever any associated property changes on the mapped domain relationship instance
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It is essential to begin by checking which property has changed, because the generated code may have registered the class to observe several other properties The event arguments contain the name of the changed property and its old and new values The old and new values will always be of the appropriate type for the property (possibly including null) The arrowheads, colors, line thickness, visibility, and other visual properties of a shape or connector are not domain properties, persisted in the store although the shapes and connectors themselves are These properties should therefore be handled as we ve described for external state, so there is no check to see whether we are InUndoRedoOrRollback (It is possible to de ne domain properties on shapes, and you could use OnAssociatedPropertyChanged() to update them from the model element properties In that case, you would avoid updating them in an Undo) Always call the overridden method in base; in this case, we do so at the end, because it will take care of redisplaying the connector
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TIP Use OnAssociatedPropertyChanged to link shape features to domain properties
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This is the easiest way to make the color, line thickness, and other features of a shape depend on domain properties
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Why don t we use some other method to perform this function For example, could we de ne an OnValueChanged() in the Sort domain property, and make that update the arrowheads Well, yes, but (a) it would be necessary to navigate explicitly the PresentationViewsSubject link between the model element and the connector, (b) to future-proof that, we should allow for the possibility of different views on the same model, and (c) putting the display logic in the main part of the model doesn t feel like good separation of concerns The OnAssociatedPropertyChanged() method provides you with a convenient way to add relationships between presentation and model, augmenting the basic facilities of the shape maps
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