Mindmap initial diagram
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CHAPTER 4 Developing a DSL Graphical Notation
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Now that we ve proven that we can quickly create a basic diagram to allow for graphical editing of our DSL, let s go back and explore in detail more of the options available using GMF
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At this point, it s a good idea to consider how to best work with a collection of GMF models EMF has no real refactoring support, per se, so it s important to understand that changes to a model with references to another won t be propagated as you might expect However, EMF does allow you to work on several models within a single resource set, in which case it does a much nicer job of keeping models in synch To accomplish this in GMF, it s best to work within the mapping model editor This way, changes to tooling, gmfgraph, the domain, and the mapping model should not result in broken models because they are all in the same editor and resource set
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435 Improving the Mindmap Diagram
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So far, we ve used the default settings that GMF provides and have established that everything is working Now let s go back and refine our models to get closer to what we want from our mindmap diagram The label icons are superfluous, as are the full rectangles for our subtopics, so let s begin by improving our notation elements and regenerating the diagram Before completing this section, you might want to review the GMF tooling models described in 11
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Updating the Graphical Definition
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Using our mapping model editor instance and expanding our mindmap gmfgraph node, create a new Figure Descriptor named TopicFigure in the Figure Gallery To this descriptor, add a child Rounded Rectangle named TopicFigure Adjust both the Corner Height and Width properties to 15 Add a Stack Layout to the Rounded Rectangle to center our label in the rectangle Add a child label named TopicNameFigure, and to keep the label from getting too close to our left and right edges, add an Insets child to the rectangle and set the Left and Right properties to 5 We want to have the default line color set to blue, but we won t use the Foreground Color elements because we want the default color to be reflected in the diagram preferences
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43 Developing the Mindmap Diagram
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We set default values in our diagram preferences in Section 435, Diagram Preferences We can delete the original rectangle figure descriptor assigned to the Node Topic and select our new rounded rectangle descriptor As with the original TopicFigure, we need to add a Child Access to the Figure Descriptor and set its Figure to our TopicNameFigure In the TopicName Diagram Label, set the label s Accessor property to the getFigureTopicNameFigure Child Access created earlier for the Topic s name label The label currently has its Element Icon property set to true This is the default, but because the icon adds no information at this point, it s just noise; set this property to false, and do the same for the RelationshipType and RelationshipName labels To provide a reasonable default size for our Topic nodes, we add a Default Size Facet element to its Node element, with a child Dimension element We give it a default size of Dx = 80, Dy = 40 That s it for our Topic node We also want to change the look of our relationship links We want to use a dashed line and open arrow decoration on the target for our relationships, and just a solid line with no decoration for our subtopic Later, we ll add a circle decoration to the target of our subtopic link, but that requires writing some custom code For now, change the name of our Polyline Decoration to RelationshipTargetDecoration and select this decoration as the Target Decoration for our RelationshipFigure Change the Line Kind of our RelationshipFigure to LINE_DASH and remove the target decoration from our Subtopics connection figure Table 4-5 shows the current state of the graphical definition; only properties that changed from their default values are shown
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Table 4-5 Element Canvas Figure Gallery Polyline Decoration Figure Descriptor Polyline Connection Mindmap Relationship Link Mappings Property Name Name Name Name Name Target Decoration Figure Descriptor Name Value mindmap Default RelationshipTargetDecoration TopicSubtopicsFigure TopicSubtopicsFigure unset RelationshipFigure (continues)
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