Essential Diagram Elements in Java

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1081 Essential Diagram Elements
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To begin, we create a new Plug-in Project in our workspace named orgeclipsemindmapdiagrampure, or a similar but necessarily different
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108 Developing a Diagram
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name from one that might have been created earlier Note that you also need to have the mindmap model and edit projects in the workspace When using the new Plug-in Project Wizard, select the option that indicates that the plug-in will make contributions to the user interface (UI), but don t use any of the provided templates When finished, you ll have a basic plug-in with activator class that extends AbstractUIPlugin
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Diagram Editor
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Using the plug-in manifest editor, add a new contribution to the orgeclipse uieditors extension-point You can do this from the Extensions tab using the UI, or you can create it directly into the pluginxml using its Text Editor tab We need to supply only the basic information for ID, class, extension, matching strategy, and contributor class, as shown here:
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<extension point="orgeclipseuieditors"> <editor id="orgeclipsemindmapdiagrameditorMindmapDiagramEditorID" name="%editorName" icon="icons/obj16/MindmapDiagramFilegif" extensions="mmd" default="true" class="orgeclipsemindmapdiagrameditorMindmapDiagramEditor" matchingStrategy="orgeclipsegmfruntimediagramui resourceseditorpartsDiagramDocumentEditorMatchingStrategy" contributorClass="orgeclipsemindmapdiagrameditor MindmapDiagramActionBarContributor"> </editor> </extension>
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Use the provided quick fix support in the editor to add new classes where required, beginning with the editor class In the wizard, indicate that the editor should extend orgeclipsegmfruntimediagramuiresources editorparts DiagramDocumentEditor This superclass offers almost all the basic functionality we need, so the only content to add at this point is an ID field and getter Note that the ID matches the ID field in our earlier plug-in manifest If we plan to share the editing domain for this editor, we must enter the appropriate extension-point contribution and ID with getter in the editor code as well We explore the sharing of editing domains in Section 44, Developing a Requirements Diagram
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public class MindmapDiagramEditor extends DiagramDocumentEditor { public MindmapDiagramEditor() { super(true);
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CHAPTER 10 Graphical Modeling Framework Runtime
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} public static final String ID = "orgeclipsemindmapdiagrameditorMindmapDiagramEditorID"; @Override public String getContributorId() { return MindmapDiagramEditorPluginID; } }
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Notice in our manifest that we declare that DiagramDocumentEditor MatchingStrategy provides our editor s matching strategy This class is provided along with our editor s superclass by the GMF runtime and is sufficient for our needs as is However, we must implement our own contributor class To do this, we again use the quick fix and create a class to extend DiagramActionBar Contributor, provided by the runtime in the orgeclipsegmf runtimediagramuiparts package We need to override two methods, as shown here The superclass uses the contribution item service to initialize a default set of action bars that are useful for most diagrams
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public class MindmapDiagramActionBarContributor extends DiagramActionBarContributor { @Override protected Class<MindmapDiagramEditor> getEditorClass() { return MindmapDiagramEditorclass; } @Override protected String getEditorId() { return MindmapDiagramEditorID; } }
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Domain Model
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We must register each of the domain model elements used in our diagram within an orgeclipsegmfruntimeemftypecoreelementTypes contribution, declaring our mindmap model NS URI as the metamodel
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<extension point="orgeclipsegmfruntimeemftypecoreelementTypes"> <metamodel nsURI="http://wwweclipseorg/2008/mindmap"> <metamodelType id="orgeclipsemindmapdiagramMap"
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108 Developing a Diagram
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icon="icons/obj16/MindmapDiagramFilegif" name="Map" eclass="Map" kind="orgeclipsegmfruntimeemftypecoreIHintedType"> <param name="semanticHint" value="Map"/> </metamodelType> <metamodelType id="orgeclipsemindmapdiagramTopic" icon="icons/obj16/MindmapDiagramFilegif" name="Topic" eclass="Topic" kind="orgeclipsegmfruntimeemftypecoreIHintedType"> <param name="semanticHint" value="Topic"/> </metamodelType> </metamodel> </extension>
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Note that both the Map and Topic classes from our domain model are registered as metamodelType elements with unique ID, name, eclass, and IHintedType kind attributes The semanticHint parameter for each metamodelType supports the mapping of each type with its corresponding View and EditPart, as you will see in our viewProviders and editpartProviders extensions Later, you ll see how these metamodel elements are mapped to palette tools and, therefore, diagram graphical elements First, we need to complement our elementTypes contribution with an enumerator that returns an IElementType instance for each of our declared metamodelType IDs, as shown here in our MindmapElementTypes class IElementType is an interface that the GMF runtime uses to define types that are displayed, created, edited, and destroyed Each type has an associated icon, display name, EClass, and EditHelper, and they all return an edit command when provided an edit request
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public class MindmapElementTypes extends AbstractElementTypeEnumerator { public static final IElementType MAP = getElementType("orgeclipsemindmapdiagramMap"); public static final IElementType TOPIC = getElementType("orgeclipsemindmapdiagramTopic"); }
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We need to add extension parser support for the diagram s notation model The runtime provides one, so we simply declare a contribution using the GMFResourceFactory class for our editor extension mmd type