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DEFINE extraMethods FOR gmfgraph::Figure- ENDDEFINE
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We create a /templates-figures/aspects/Extrasxpt template in our orgeclipsedsldnc project As discussed in Section 423, Customization Options, GMF uses the convention of prefixing the directory structure for aspects with a folder named aspects, followed by the original path to the template, as defined in the *codegen project In this case, we want to provide an aspect for the Extrasxpt template, which is located directly in the /templates folder We ll use the path /orgeclipsedsldnc/templates-figures/ in the wizard dialog, as shown in Figure 4-45 When the generator finds the aspects folder, it will know to add this as an aspect template path Following is our template, which, as you can see, uses the polymorphic feature of Xpand to add our gradient code only for RoundedRectangle figures We need to provide the obligatory DEFINE for the Figure supertype as well Also note that we re adding a useGradient Boolean to control whether to display gradients, which we can later hook up to a diagram preferences option
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IMPORT "http://wwweclipseorg/gmf/2006/GraphicalDefinition" IMPORT "http://wwweclipseorg/emf/2002/Ecore" AROUND extraMethods FOR gmfgraph::Figure- EXPAND gradient- targetDefproceed() ENDAROUND DEFINE gradient FOR gmfgraph::Figure ENDDEFINE DEFINE gradient FOR gmfgraph::RoundedRectangle- /** * @generated */ private boolean useGradient = true;
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46 Developing the Color Modeling Diagram
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/** * @generated */ public void setUseGradient(boolean useGradient) { thisuseGradient = useGradient; } /** * @generated */ public boolean getUseGradient() { return useGradient; } /** * @generated */ protected void fillShape(orgeclipsedraw2dGraphics graphics) { if (useGradient) { graphicsfillGradient(boundsx, boundsy + 24, boundswidth, boundsheight, true); } } ENDDEFINE
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We can again transform our mapping model to the generator model, adding our path to the figure template in the provisional GMFGraph Dynamic Templates field, and regenerate our diagram code Recall that figures are serialized within the generator model by default, although we used the standalone figures method in the Scenario diagram that eliminates the need to regenerate all the diagram code to see the change Figure 4-44 shows the result, with the remaining task of assigning the proper color for each archetype, based on its type We want to avoid hard-coding this into our figures, which we mentioned when creating the graphical definition model Instead, let s see what is involved in adding color preferences for each archetype that the Practitioner can change, if desired
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466 Color Preferences
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Basing the color of an archetype on its type is straightforward enough, and you can most easily accomplish this by overriding the setForegroundColor() method in each Archetype EditPart class Recall that the gradient effect goes from our foreground to background color For example, this simple implementation in our MomentIntervalEditPart class causes it to produce the desired gradient effect:
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CHAPTER 4 Developing a DSL Graphical Notation
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@Override protected void setForegroundColor(Color) { supersetForegroundColor(new Color(null, 250, 145, 145)); }
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We need to do a bit more for the color to be obtained from the diagram preferences, and for diagram elements to respond to changes in the default values Plus, we again want to modify our code-generation templates so that these changes will not be overridden if we forget to add the appropriate @generated NOT tag, or if we need to delete and regenerate our diagram plug-in entirely
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Even though it might require a little more effort to implement, adding custom templates to implement a feature for your diagram is likely worthwhile if you find yourself regenerating clean diagram plug-ins due to refactorings, and given the reality of code merge technology limitations
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This time, we need to import the orgeclipsegmfcodegen plug-in into our workspace as a source project, just as we did for the orgeclipsegmf graphdefcodegen plug-in earlier You will find a lot of templates and extension files in this project, so consider it a resource for understanding how to use Xpand, not to mention how to modify GMF generation Another good source of examples for working with GMF, custom templates, and extensions is the UML2 Tools project Looking at our generated diagram code, we see that the DiagramAppearancePreferencePage class is the best location for our archetype color preferences Currently, this page provides default font, line color, and fill color preferences, among others We can add another group for archetype color preferences below the existing group As before, we first code our changes manually and then templify the changes in our custom templates Looking at the AppearancePreferencePage superclass of this preference page, we see that adding our own group and color defaults should be straightforward Using copy and paste, we insert the following code into our diagram s preference page, which started as a simple subclass designed for extension Note that we override the addFields() method to allow for the addition of the archetype color group To save space, some repetitive code is commented out
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