Editor 3.x/4.x – org.eclipse.ui.editorss

I would like to show you how to re-use the Eclipse editor area in an e4 application. Before, I had the problem that the editor disappeared after maximizing views or that Eclipse showed me messages like:

!MESSAGE Exception while dispatching event org.osgi.service.event.Event [topic=org/eclipse/e4/ui/model/application/ApplicationElement/tags/REMOVE] {ChangedElement=org.eclipse.e4.ui.model.application.ui.basic.impl.PartStackImpl@4981d95b (elementId: org.eclipse.chemclipse.ux.extension.msd.ui.partstack.main.2, tags: [active], contributorURI: platform:/plugin/org.eclipse.chemclipse.ux.extension.msd.ui) (widget: CTabFolder {}, renderer: org.eclipse.e4.ui.workbench.renderers.swt.StackRenderer@7b2f8152, toBeRendered: true, onTop: false, visible: true, containerData: 10000, accessibilityPhrase: null), Widget=CTabFolder {}, AttName=tags, EventType=REMOVE, Position=1, OldValue=Maximized} to handler org.eclipse.e4.ui.internal.di.UIEventObjectSupplier$UIEventHandler@5f32ab17
org.eclipse.e4.core.di.InjectionException: java.lang.ClassCastException: org.eclipse.e4.ui.model.application.ui.advanced.impl.AreaImpl cannot be cast to org.eclipse.e4.ui.model.application.ui.advanced.MPlaceholder
at org.eclipse.e4.core.internal.di.MethodRequestor.execute(MethodRequestor.java:68)
at org.eclipse.e4.ui.internal.di.UIEventObjectSupplier$UIEventHandler$1.run(UIEventObjectSupplier.java:56)

So, here’s the description how to use the editor correctly:

A) Define an Area under “Shared Elements” in the Application.e4xmi:

Application.e4xmi Area

B) Insert a “Part Stack” called “org.eclipse.e4.primaryDataStack”:

Application.e4xmi Part Stack

Add the tags:

  • newtablook
  • org.eclipse.e4.primaryDataStack
  • EditorStack
  • NoAutoCollapse

Application.e4xmi Part Stack Tags

C) Import the Area in the fragment.e4xmi:

fragment.e4xmi Import

D) Reference the Area via a Placeholder called “org.eclipse.ui.editorss”:

fragment.e4xmi Placeholder

It’s important that the Placeholder gets the ID “org.eclipse.ui.editorss”. The Area must be referenced in other perspectives via the same placeholder ID “org.eclipse.ui.editorss”.

E) The 3.x editor is used when elements are opened via the “Project Explorer”:

3.x Editor

F) The 4.x editor is used when elements are opened via 4.x editor parts:

4.x Editor

That’s it!

About Philip Wenig

Founder of OpenChrom
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