content: /*******************************************************************************
   * Copyright (c) 2000, 2008 IBM Corporation and others.
   * All rights reserved. This program and the accompanying materials
   * are made available under the terms of the Eclipse Public License v1.0
   * which accompanies this distribution, and is available at
   * http://www.eclipse.org/legal/epl-v10.html
   *
   * Contributors:
   *   Jesper Kamstrup Linnet (eclipse@kamstrup-linnet.dk) - initial API and implementation 
   * 			(report 36180: Callers/Callees view)
   *******************************************************************************/
  package org.eclipse.wst.jsdt.internal.ui.callhierarchy;
  
  import org.eclipse.core.runtime.Assert;
  import org.eclipse.jface.action.Action;
  import org.eclipse.jface.resource.ImageDescriptor;
  import org.eclipse.ui.PlatformUI;
  import org.eclipse.wst.jsdt.core.IJavaScriptElement;
  import org.eclipse.wst.jsdt.core.IFunction;
  import org.eclipse.wst.jsdt.internal.corext.util.Messages;
  import org.eclipse.wst.jsdt.internal.ui.IJavaHelpContextIds;
  import org.eclipse.wst.jsdt.internal.ui.viewsupport.JavaElementImageProvider;
  import org.eclipse.wst.jsdt.ui.JavaScriptElementLabelProvider;
  
  /**
   * Action used for the type hierarchy forward / backward buttons
   */
  class HistoryAction extends Action {
      private static JavaScriptElementLabelProvider fLabelProvider = new JavaScriptElementLabelProvider(JavaScriptElementLabelProvider.SHOW_POST_QUALIFIED |
              JavaScriptElementLabelProvider.SHOW_PARAMETERS |
              JavaScriptElementLabelProvider.SHOW_RETURN_TYPE);
      private CallHierarchyViewPart fView;
      private IFunction fMethod;
  
      public HistoryAction(CallHierarchyViewPart viewPart, IFunction element) {
          super("", AS_RADIO_BUTTON); //$NON-NLS-1$
          fView = viewPart;
          fMethod = element;
  
          String elementName = getElementLabel(element);
          setText(elementName);
          setImageDescriptor(getImageDescriptor(element));
  
          setDescription(Messages.format(CallHierarchyMessages.HistoryAction_description, elementName)); 
          setToolTipText(Messages.format(CallHierarchyMessages.HistoryAction_tooltip, elementName)); 
          
          PlatformUI.getWorkbench().getHelpSystem().setHelp(this, IJavaHelpContextIds.CALL_HIERARCHY_HISTORY_ACTION);
      }
  
      private ImageDescriptor getImageDescriptor(IJavaScriptElement elem) {
          JavaElementImageProvider imageProvider = new JavaElementImageProvider();
          ImageDescriptor desc = imageProvider.getBaseImageDescriptor(elem, 0);
          imageProvider.dispose();
  
          return desc;
      }
  
      /*
       * @see Action#run()
       */
      public void run() {
          fView.gotoHistoryEntry(fMethod);
      }
  
      /**
       * @param element
       * @return String
       */
      private String getElementLabel(IJavaScriptElement element) {
          Assert.isNotNull(element);
          return fLabelProvider.getText(element);
      }
  }
  