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Creation, Deletion, and Update Behavior
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Introduction
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2 introduced the different aspects of the de nition of a DSL: the domain model; the presentation layer, including graphical notation, explorer, and properties window; creation, deletion, and update behavior; validation; and serialization 3 described the rst aspect, the domain model, and 4 described the presentation aspect This chapter focuses on how to de ne update behavior, that is, creation of elements using the toolbox and explorer, editing of properties of elements through the properties window, and deletion of elements
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Element Creation
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When a new element is created in the store, it must be linked into the embedding tree that is, it must be the target of one embedding link, and there must be a path back through embedding links to the root element It cannot otherwise be presented on the diagram or serialized When the user drags from an element tool onto the diagram, this gesture: Creates a new element of the class determined by the Tool de nition (in the DSL explorer under Editor\ToolboxTabs )
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5: Creation, Deletion, and Update Behavior
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Creates a link or links between the new element and the existing ones This behavior is determined by the element merge directive of the target element that is, the one the tool was dragged onto Fires rules that update the diagram to show the new element These are determined by the shape maps, as we saw in the previous chapter The last point is important We rely on xup rules to maintain, on the screen, a presentation of what is going on in the model All the techniques in this chapter and indeed much of the custom methods you might write deal only with the domain classes and domain relationships Once we ve set up the shapes and their mappings to the domain model (as discussed in 4), we can just work with the domain model, leaving the diagrams to look after themselves
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The Toolbox Tools are defined in the DSL explorer under Editor\ToolboxTabs\ YourTab\Tools You need to define a tool for each item you want to appear on the toolbox (Figure 5-1) The tab name is the heading that appears above each group of tools in the toolbox By default, you have just one tab, named after your language, but you can add more tabs in the explorer if you wish
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Figure 5-1: The toolbox for the Issue Tracking DSL
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There are two kinds of tools: element tools and connection tools At runtime, you operate an element tool by dragging it from the toolbox to the diagram; for a connection tool, you click it and then drag it between the two elements you want connected (or click them in succession) The most common scheme
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is to provide an element tool for each class that is mapped to a shape on the diagram and a connection tool for each relationship mapped to a connector Each tool has a name, caption, tooltip, toolbox icon, and help keyword; these are set in the properties window (Figure 5-2) In addition, an element tool can have a cursor icon that shows while you are dragging it, and a connection tool can have source and target cursor icons that show while waiting for you to select the source and target of the connection
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Figure 5-2: Toolbox definition for the Issue Tracking DSL
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Each element tool is associated with a single domain class Unless you write custom code, the tool creates a single element of this class each time the user drags from the tool to the drawing surface The properties of the new element have their default values as speci ed in the DSL de nition The construction of relationships between the new element and the existing model is governed by an element merge directive, which we ll look at shortly Each connection tool invokes a speci ed connection builder, which governs what elements may be created and the result of creating them You might expect that by analogy with the element tools, each connection tool would be
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