An example handler to open an Xtext element in a graphical view

Handler.xtend

class ShowInViewHandler extends AbstractHandler {

  @Inject EObjectAtOffsetHelper eObjectAtOffsetHelper
	
  override Object execute(ExecutionEvent event) 
      throws ExecutionException {
    val editor = EditorUtils.getActiveXtextEditor(event)
    if (editor != null) {
      val selection = editor.selectionProvider.selection 
          as ITextSelection
      editor.document.readOnly [
        val selectedElement = eObjectAtOffsetHelper
             .resolveElementAt(it, selection.offset)
        if (selectedElement != null) {
          ... // open in view
        }
      ]
    }
    return null
  }
}