Make Editor Not-Closeable

Question

I have a standard E3 editor in the current E4 world:

public class ProjectEditor extends EditorPart {
     // implement
}

Registered like that:

<extension point="org.eclipse.ui.editors">
   <editor
        class="com.qualitype.gpm.project.rcp.ProjectEditor"
        icon="icons/obj16/project.gif"
        id="com.qualitype.gpm.project.rcp.ProjectEditor"
        name="%view.project" >
   </editor>
</extension>

I want that editor to be always open. But a parameter like for the views is missing in the extension point.

Also, for views this would work:

public class ProjectPerspective implements IPerspectiveFactory {

    public void createInitialLayout(IPageLayout layout) {
        final IViewLayout projectLayout = layout.getViewLayout(ProjectEditor.ID);
        projectLayout.setCloseable(false);
    }
}

But of course not for editors. Since both editors and view are technically the same thing (workbench parts), it should be possible.

How do I prevent the user from closing my editor?

Answer 1

You can remove the close 'X' on the editor tab by clearing the MPart closeable flag. You could do this in the editor's init method:

@Override
public void init(IEditorSite site, IEditorInput editorInput) throws PartInitException
{
  super.init(site, editorInput);

  MPart part = getSite().getService(MPart.class);
  part.setCloseable(false);

But the 'File > Close' action will still be able to close the editor as it doesn't check the closeable flag and has no concept of un-closeable editors.