bundles/org.simantics.utils.ui.workbench/src/org/simantics/utils/ui/workbench/FocusContextActivator.java

   1 /*******************************************************************************
   2  * Copyright (c) 2007, 2010 Association for Decentralized Information Management
   3  * in Industry THTH ry.
   4  * All rights reserved. This program and the accompanying materials
   5  * are made available under the terms of the Eclipse Public License v1.0
   6  * which accompanies this distribution, and is available at
   7  * http://www.eclipse.org/legal/epl-v10.html
   8  *
   9  * Contributors:
  10  *     VTT Technical Research Centre of Finland - initial API and implementation
  11  *******************************************************************************/
  12 package org.simantics.utils.ui.workbench;
  13
  14 import org.eclipse.swt.events.FocusEvent;
  15 import org.eclipse.swt.events.FocusListener;
  16 import org.eclipse.swt.widgets.Control;
  17 import org.eclipse.ui.IWorkbenchWindow;
  18 import org.eclipse.ui.contexts.IContextActivation;
  19 import org.eclipse.ui.contexts.IContextService;
  20
  21 public class FocusContextActivator {
  22
  23     private String             contextId;
  24
  25     private IContextActivation activation;
  26
  27     public FocusContextActivator(String contextId, final Control c, final IWorkbenchWindow window) {
  28         this.contextId = contextId;
  29
  30         c.addFocusListener(new FocusListener() {
  31             private IContextService getService() {
  32                 return (IContextService) window.getService(IContextService.class);
  33             }
  34
  35             @Override
  36             public void focusGained(FocusEvent e) {
  37                 IContextService contextService = getService();
  38                 String ctx = FocusContextActivator.this.contextId;
  39                 if (contextService != null && ctx != null)
  40                     activation = contextService.activateContext(ctx);
  41             }
  42
  43             @Override
  44             public void focusLost(FocusEvent e) {
  45                 IContextService contextService = getService();
  46                 if (contextService != null && activation != null)
  47                     contextService.deactivateContext(activation);
  48             }
  49         });
  50     }
  51
  52 }