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Custom connect code is used to create a complex connection, for example, where the link is not between the source and target directly indicated by the user, but between some related items, or when there are actually several links to be created or perhaps some adjustment to be made to the properties of some of the elements
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If you set the Custom connect checkbox for a particular class in the Connect Directive details, then your code will be called just when the user s rst click was on an element of that domain class (As before, you would choose to set it in the Source role directives tab or the Target role directives tab, depending on whether you have set Reverses Direction on the tool that uses this connection builder) If you set the Uses custom connect checkbox for a whole link directive (see the bottom left of Figure 5-25) then your code will be called if some combination of source and target was accepted Alternatively, you can set the Is Custom ag on the whole connection builder, to determine everything that happens when the user selects the associated tool A typical customized connect creates additional links or elements In the Components sample, the user must create ports on the components before linking them (Figure 5-26) To save the user some time, we can create a port if necessary The user can drag the connect tool either between existing ports or from or to the main body of a component In the latter case, a new port is constructed, and the connection is made to that
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Figure 5-26: Components and ports
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In this case, it is easiest to set the Is Custom ag on the whole connection builder (Select the connection builder in the DSL explorer and set the ag in the properties window As always, after modifying the DSL de nition, click the Transform All Templates button to generate the code) This generates a generic connection builder for which we have to provide three methods in a partial class
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namespace CJKWCJKWComponentModels { public static partial class ConnectionBuilder { ///<summary> /// Called to determine if we can drag from here ///</summary> internal static bool CanAcceptSource (ModelElement sourceElement) { return sourceElement is Component || sourceElement is OutPort; } ///<summary> /// Called to determine if we can drag between these ///</summary> internal static bool CanAcceptSourceAndTarget (ModelElement sourceElement, ModelElement targetElement) { return targetElement is Component || targetElement is InPort; // CanAcceptSource already checked } ///<summary> /// Called to perform the connection ///</summary> internal static void Connect (ModelElement sourceElement, ModelElement targetElement) { // Is the source a Component or a Port OutPort outPort = sourceElement as OutPort; Component sourceComponent = sourceElement as Component; if (sourceComponent != null) { // A component - so we need to create a source port outPort = new OutPort(sourceComponentPartition); outPortComponent = sourceComponent; } // Is the target a Component or a Port InPort inPort = targetElement as InPort; Component targetComponent = targetElement as Component; if (targetComponent != null) {
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// a component - so we need to create a target Port inPort = new InPort(targetComponentPartition); inPortComponent = targetComponent; } // make the connection between the two ports outPortTargetsAdd(inPort); // easy, eh } } }
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As the DSL is running in a designer or other application, instances can of course be both created and deleted In a designer, the user can point to a shape or an element in the explorer and press delete, or code that you have written can call Remove() on the element When an element is removed by any means, rules re that seek to ensure the consistency of the store by removing any dependent elements One deletion rule is immutable: When any element is deleted, every link of which it is the source or target is deleted too What happens next depends on the delete propagation rules for the links Separate delete rules can be de ned for each relationship There is a default set of rules, so you only have to think about them when you want something special to happen
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