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How can I change a property of a figure when a domain property changes The most straightforward approach is to override the handleNotificationEvent() method in the EditPart and determine whether the change was on the domain property of interest If so, update the corresponding figure accordingly Section 435, Subtopic Figure, gives an example of a domain change being detected to invoke diagram layout How can I make my figure nonresizable Using code, you install a NonResizeableEditPolicy for the EditPolicyLAYOUT_ROLE To accomplish this in the definition model, set the Resize Constraint of the Node element to NONE and provide a Default Size Facet, as illustrated in Section 451, Gateways What does canonical mean in the context of GMF In terms of the runtime, canonical refers to the capability of a container to maintain its children views in synchronization with their underlying domain elements For example, consider a compartment within a Class element in a UML diagram New elements added to the underlying domain model are synchronized with the compartment view automatically In this case, the compartment is a canonical container and keeps track of changes to its children Why can t I see elements I place on the diagram This can happen when you use certain versions of Linux that might not have the Cairo graphics library installed or that have Windows 2000 without the GDI+ library The selection border for elements typically is shown, so try using Select All (Ctrl+A) to verify this If this is your issue, install the missing libraries You can also disable anti-aliasing for the diagram to resolve the problem; this option is available in the preferences of your diagram
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The FAQs in this section relate to using the GMF Tooling models for diagram generation How do I modify the output of the generation templates You can modify the templates for both figure generation and diagram code using the extensibility options provided by the underlying Xpand model-to-text framework This book explores each of these techniques See Section 423, Customization Options, for a general overview and Sections 465, Gradient Figures, and 466, Color Preferences, for specific examples
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CHAPTER 12 Graphical Modeling Framework FAQs
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Do I have to use the tooling component to use GMF No As described in Section 108, Developing a Diagram, you can develop a diagram manually using the provided extension-points and APIs Using the tooling to get started is generally recommended because you can generate a lot of the code you need to write from its models How can I include a diagram as one page in a multipage editor The process for doing this is currently long and involved, although it eventually might become easier if the generation of both EMF and GMF is modified to facilitate this common request You can refer to an Eclipse Corner article on this topic (see Section 446, Integrating EMF and GMF Editors ) How can I get nodes to stick to the border of a parent In the Node element of the graphical definition model, set the Affixed Parent Side property to something other than NONE Based on the Node mapping for the parent, or the domain element that has a containment reference that holds instances of the child, the generated EditPart has a BorderItemSelection EditPolicy installed for its EditPolicyLAYOUT_ROLE Section 456, Requirement to Scenario Partition, illustrates this Why does GMF have its own version of Xpand Historically, GMF adopted Xpand to replace Java Emitter Templates (JET) as the primary template engine, but Xpand had some IP cleanliness issues The GMF team refactored Xpand to use the LALR Parser Generator (LPG) parser generator, in addition to some other enhancements Currently, additional refactoring is underway to replace Xtend with Object Constraint Language (OCL)/QVT Operational (QVTO), so this variant of Xpand likely will migrate to the Model-to-Text Transformation (M2T) project as a distinct, though similar, alternative to the original Xpand Furthermore, the Xpand team is working to implement its next version, based on Xtext
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In this chapter, we look into some typical FAQs about the GMF runtime and tooling While not exhaustive, many other FAQs can be found on the project website
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