title: How to enable/disable a TextCellEditor
body: <p>I am making an application which contains 2 views. The first one contains a tree viewer which displays the folders from my system and the second one contains a table viewer which displays the content of a directory selected in the first view. Long story short: a file explorer.</p>
  
  <pre class="lang-java prettyprint-override"><code>    //initialization of the table viewer
      tableViewer = new TableViewer(parent, SWT.BORDER | SWT.MULTI | SWT.V_SCROLL);       
      tableViewer.setContentProvider(new FileTableContentProvider());
      tableViewer.setLabelProvider(new FileTableLabelProvider());     
  
      //from within the implementation of any view or editor
      /*
       * getSite() - Returns the site for this workbench part (a workbench part can be a view (IViewPart) or an editor (IEditorPart))
       * this view is a selection provider; the view sends the event to all the views registered to the selection service
       */
      getSite().setSelectionProvider(tableViewer);
  
      //the table column "Name" is added to the table viewer
      TableColumn columnName = new TableColumn(tableViewer.getTable(), SWT.LEFT);
      columnName.setText("Name");
      columnName.setResizable(true);
      columnName.setWidth(200);
  
      //the table column "Date modified" is added to the table viewer
      TableColumn columnDateModified = new TableColumn(tableViewer.getTable(), SWT.LEFT);
      columnDateModified.setText("Date modified");
      columnDateModified.setResizable(true);
      columnDateModified.setWidth(200);
  
      //the table column "Type" is added to the table viewer
      TableColumn columnType = new TableColumn(tableViewer.getTable(), SWT.LEFT);
      columnType.setText("Type");
      columnType.setResizable(true);
      columnType.setWidth(200);       
  
      //make the header of the table visible
      tableViewer.getTable().setHeaderVisible(true);      
  
      /*
       * getSite().getPage() - gets the active workbench page.
       */
      getSite().getPage().addSelectionListener("com.awebofcode.fileexplorer.view.filetree",(ISelectionListener)this);
  
      /*
       * add a doubleClickListener for:
       * 1) if the object selected is a file, then the file will be opened with the associated program
       * 2) if the object selected is a directory, then enter the folder and update the tree viewer
       */
      tableViewer.addDoubleClickListener(new IDoubleClickListener(){
  
          @Override
          public void doubleClick(DoubleClickEvent event) {
              IStructuredSelection selection = (IStructuredSelection) event.getSelection();
              File itemSelected = (File) selection.getFirstElement();
  
              //if the selected item is a file a double click will launch the associated program
              if (itemSelected.isFile() &amp;&amp; itemSelected.exists()){
                  Program.launch(itemSelected.getAbsolutePath());
              }else if (itemSelected.isDirectory()){
                  /*
                   * Update the tree viewer;
                   * PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage().findView(FileTreeView.ID) --&gt; returns the view with the specified ID
                   * setSelection() will send an event and the setSelectionChanged will run
                   */
                  ((FileTreeView) PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage().findView(FileTreeView.ID)).getTreeViewer().setSelection(selection);
              }
          }
  
      });
  
      //create the cell editor
      CellEditor[] editors = new CellEditor[1];
      editors[0] = new TextCellEditor(tableViewer.getTable());
      tableViewer.setColumnProperties(new String[]{"Name", "Date modified", "Type"});
      //assign the cell editors to the table viewer
      tableViewer.setCellEditors(editors);
      //set the cell modifier to the table viewer
      tableViewer.setCellModifier(new NameCellModifier(tableViewer));
  </code></pre>
  
  <p>I created an action that will rename the selected file or folder from the second view.</p>
  
  <p>When I click on the name of the file I don't want to enter in the editing mode.I want to stay in the selection mode and only after I click <em>File -> Rename</em> (action rename) the editing mode has to be enabled.</p>
  
  <p>The problem is that I cannot find how to enable/disable the <code>TextCellEditor</code>.</p>