Graphical Modeling Framework Runtime in Java

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CHAPTER 10 Graphical Modeling Framework Runtime
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In our MindmapEditPartProvider, we similarly add a Map and override getEdgeEditPart() to return our new SubtopicEditPart class
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public class MindmapEditPartProvider extends AbstractEditPartProvider { private final Map<String, Class< >> edgeMap = new HashMap<String, Class< >>(); { edgeMapput("Subtopic", SubtopicEditPartclass); } // @Override protected Class getEdgeEditPartClass(View view) { return (Class) edgeMapget(viewgetType()); } }
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Finally, we add our SubtopicEditPart, which simply returns a new PolylineConnectionEx as our link figure
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public class SubtopicEditPart extends ConnectionNodeEditPart { public SubtopicEditPart(View view) { super(view); } @Override protected Connection createConnectionFigure() { if (getModel() == null) { return null; } Connection connection = new PolylineConnectionEx(); return connection; } }
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At this point, we can draw Topic rectangles and solid links between them to signify subtopic relationships, as shown in Figure 10-53 Without labels to indicate our Topic names on the diagram, it s still not terribly useful Providing usable labels requires a bit of work that we d rather generate, so let s move to the next section and compare this manual implementation of a simple mindmap with that generated by the tooling component For another example of contributing a parser provider for labels, see Section 467, Custom Parsers
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108 Developing a Diagram
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Figure 10-53
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Basic mindmap diagram
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1084 Comparison to Generated Diagram
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Now that we ve manually created a diagram using the GMF runtime, let s compare the result with what the tooling component of GMF is generating If we define a simple mindmap graphical, tooling, mapping, and generator model (see Section 434, Mindmap Generator Model ), we can observe what is generated with what was created above by hand Note that what s described below is only for a simple mapping of the Topic element to a node, subtopics relationship mapped to a link, and topic name label No advanced options (such as printing support, shortcuts, audits, metrics, and so on) were selected, which would cause even more to be generated The generated diagram contributes extensions to a number of runtime extension-points, including contributionItemProviders, globalAction HandlerProviders, iconProviders, parserProviders, viewProviders, editpartProviders, elementTypes, elementTypeBindings, and modelingAssistantProviders Notably missing are the editpolicy Providers and paletteProviders contributions The tooling team did not think these were necessary, opting instead to add generated EditPolicy contributions directly in EditParts and generating a PaletteFactory implementation from the gmftool model directly Figure 10-54 shows the runtime extension-points contributed to by the initial mindmap diagram defined in 4 In addition to providing labels with parser providers for in-place editing, the generated diagram provides diagram preferences, generic navigator support, link reorientation commands, diagram initialization from an existing domain model instance, a diagram update command, and several other features For larger diagrams with many domain elements and diagram representation, clearly, beginning with the tooling models and generating the base implementation is the
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CHAPTER 10 Graphical Modeling Framework Runtime
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preferred approach For more information on producing diagrams using the tooling and extending the generative approach, see 4 and 11, Graphical Modeling Framework Tooling
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Figure 10-54
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Mindmap generated extension-point contributions
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109 Extending Diagrams
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You learned in Section 435, Adding Custom Layout, that it s possible to extend an existing diagram through the use of a customization plug-in In this case, we were able to add a custom layout to our Mindmap diagram, along with an Insert Subtopic action using standard Eclipse UI contribution techniques In Section 467, Custom Parsers, we similarly were able contribute a custom parser for attributes in our Color Modeling diagram In this section, we continue the extension story and demonstrate how to add custom figures to an existing diagram Specifically, we add an SVG version of the BPMN Intermediate Event node for use in our Scenario diagram
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1091 Scenario Diagram Custom View and Edit Providers
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We begin by creating a new plug-in project named orgeclipsescenariodiagramcustom in our workspace Add a dependency to our orgeclipsescenariodiagram plug-in, along with orgeclipse gmfruntimediagramui and orgeclipsegmfruntimedraw2d uirender To override the default View and EditPart providers in the
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