Rule Types in Visual C#

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Each rule must be a subclass of one of a xed set of base classes These provide the means to observe different categories of events Rule base classes are listed in Table 10-3
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Table 10-3: Rule Types Rule base class AddRule Fires when
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An element is created Consider whether you want to apply this to the element or the shape that presents it If you need to guarantee to re after the shape and the element have been connected, apply an AddRule to PresentationViewsSubject An element has been deleted An element is about to be deleted A property has been changed This applies to ordinary domain properties It doesn t apply to the role properties of the class at each end of a relationship; if you want to observe a link being created, set Add and Delete rules on the relationship
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DeleteRule DeletingRule ChangeRule
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RolePlayerChangeRule RolePlayerPositionChangedRule
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The roleplayer of a link changes The ordering of links sourced at a particular object is changed An object has been moved from one store partition to another
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MoveRule
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Re sponding to Change s
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Rule base class TransactionBeginningRule TransactionCommittingRule TransactionRollingBackRule
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Fires when
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Start of a transaction Successful end of a transaction Rolled back transaction
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The name of the method you override and its parameter type vary between rule types Type override and let IntelliSense do the rest! For a ChangeRule, you get the model element that has changed, the Id of the property that has changed, together with its old and new values Remember to test the domain property Id, because the method will be called for every property of the class Every domain property has a domain property Id, that is a static constant of its declaring class In addition to the domain properties you have declared in your DSL, there is a small selection of prede ned properties on the base classes NodeShape has two such properties AbsoluteBounds and IsExpanded which in the method arguments are identi ed by their Ids AbsoluteBoundsDomainPropertyId and IsExpandedDomainPropertyId This example responds to changes in the location of a shape
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public override void ElementPropertyChanged (ElementPropertyChangedEventArgs e) { NodeShape stateShape = eModelElement as NodeShape; if (stateShape == null) return; if (stateShapeStoreTransactionManager CurrentTransactionIsSerializing)) return; if (eDomainPropertyId == NodeShapeAbsoluteBoundsDomainPropertyId) { RectangleD oldBounds = (RectangleD)eOldValue; RectangleD newBounds = stateShapeAbsoluteBoundingBox; HandleBoundsChange(stateShape, oldBounds, newBounds); } }
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10: Advanced DSL Customization Rules and Calculated and Custom Storage Domain Properties
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Store rules and events cannot be set on calculated or custom storage properties Instead, you need to set rules on the sources of the values
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Rules and Transactions
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Every rule res within the transaction that triggered it This means that from the user s point of view, the effects of the rules are all part of the same change as their trigger In this example, moving a shape moves all those contained within it If the user clicks the Undo button, all the shapes move back to their original places An alternative approach would have been to use the OnAbsoluteBoundsChanged event This works after the original transaction has completed to make any changes to the store (such as shape locations), you have to open another transaction This means that if the user then clicks Undo, the contained shapes would be shifted back but the original move of the container shape would not If this is the effect you want, don t use a rule Rules are not called as a result of changes in an undo or redo, or when a transaction is being rolled back The assumption is that all the changes you make in a rule are to other values within the store; the undo manager will reset these to their former values, so there should be no need to call any rules For this reason, you should not use rules to change values that are outside the store This would be other values in your application such as le contents or some of the purely graphical properties of the shapes such as color or line thickness
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