Developing a DSL Graphical Notation in Java

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CHAPTER 4 Developing a DSL Graphical Notation
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To allow our WrapLabel to wrap, we need to slightly modify the createContents() method as follows:
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/** * Modified to enable text wrapping * * @generated NOT */ private void createContents() { fFigureTopicNameFigure = new WrappingLabel(); fFigureTopicNameFiguresetText(""); fFigureTopicNameFiguresetTextWrap(true); fFigureTopicNameFiguresetAlignment(PositionConstantsLEFT); thisadd(fFigureTopicNameFigure); }
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Figure 4-9 shows our diagram Note the relationship stack of tools in the palette and note that the mindmapecore literal values for our relationship Type enum have been changed to lowercase Alternatively, we could have changed the case within our label code, or even shortened the literal values to be just d, e, or i
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Figure 4-9
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Mindmap relationship links
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Adding Custom Layout
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A major requirement for a mindmap diagram is good layout, preferably automatic A fixed layout is fine for our needs, although more advanced layout strategies that are pseudo-fixed are possible Mindmaps should be arranged in a tree, typically with both left-to-right and right-to-left flows to the sides of the central Topic The default layout for GMF-generated diagrams is top-to-bottom The
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43 Developing the Mindmap Diagram
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layout we need is similar, if you consider that mainly the orientation of the layout needs to be changed from vertical to horizontal This is exactly what the GMF runtime s LeftRightProvider class provides, so we use it as a starting point We could add the following modifications to our generated diagram plug-in, but as mentioned earlier, this would make regeneration and maintenance more difficult Instead, here we create a new orgeclipsemindmapdiagram custom plug-in project using PDE and put our modifications in this separate plug-in Let s back up a minute and discuss the big picture of diagram layout and our needs for the mindmap You ve seen that the main toolbar for all GMF diagrams has a layout button, with a corresponding context menu on the diagram canvas The runtime provides these by default for all diagrams, so it s a matter of adding our own provider for the layout service to invoke We begin with the layoutProviders extension-point and contribute the following to our pluginxml manifest Section 10410, Layout Service, discusses the layout service
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<extension point="orgeclipsegmfruntimediagramuilayoutProviders"> <layoutProvider class="orgeclipsemindmapdiagramlayout MindmapDefaultLayoutProvider"> <Priority name="Low"/> </layoutProvider> </extension>
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We ve set the priority of our provider to Low, which is one level above Lowest Now we need to implement the MindmapDefaultLayoutProvider, as shown here:
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public class MindmapDefaultLayoutProvider extends LeftRightProvider { public static String DEFAULT_LAYOUT = "Default"; public boolean provides(IOperation operation) { // enable this provider only on mindmap diagrams if (operation instanceof ILayoutNodeOperation) { Iterator< > nodes = ((ILayoutNodeOperation) operation)getLayoutNodes()listIterator(); if (nodeshasNext()) { View node = ((ILayoutNode) nodesnext())getNode(); Diagram container = nodegetDiagram(); if (container == null || !(containergetType()equalsIgnoreCase("mindmap"))) return false; }
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CHAPTER 4 Developing a DSL Graphical Notation
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} else { return false; } IAdaptable layoutHint = ((ILayoutNodeOperation) operation)getLayoutHint(); String layoutType = (String) layoutHintgetAdapter(Stringclass); return LayoutTypeDEFAULTequals(layoutType); } }
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As you can see, our default provider simply extends the runtime-provided
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LeftRightProvider and only needs to override the provides() method to
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enable our provider for mindmap diagrams We ll further modify this provider later to get the layout we want, but for now, this is all we need to get started Besides the need to provide both left-to-right and right-to-left layout of topics about a centered root, we want to ignore dependency links when performing a layout More specifically, we want to lay out topics in a tree structure while arranging relationship links to avoid topics; relationship links will be optionally hidden and should not be considered during main layout When deployed, this provider replaces the default layout provider that the menu item and toolbar invoke Section 435, Subtopic Figure, explores what is required to programmatically invoke layout on a diagram as we create subtopics using a keyboard shortcut
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Subtopic Figure
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For our notation, we want root Topic elements to be displayed with a rounded rectangle, and subtopic elements to be displayed with a single underline Our domain model has no notion of distinct Topic and subtopic elements, so this means we end up with two figures for the Topic element that will change depending on the structure of the elements Furthermore, we might decide that n-level subtopic elements should have yet another notation, so we focus on a solution that is general Currently, the models of GMF cannot handle this type of definition, whereby a different figure represents a domain element based on its state This is a planned enhancement for GMF, but in the meantime, we begin by adding a new subtopic figure The subtopic figure is a rectangle with only the bottom border drawn, thereby appearing as an underline for our subtopic name The makeup of this figure is somewhat complicated Table 4-7 details our subtopic figure and node properties Note the use of CustomBorder, which uses a provided runtime figure
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