content: /*******************************************************************************
   * Copyright (c) 2000, 2007 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.jface.action.IMenuListener;
  import org.eclipse.jface.action.MenuManager;
  import org.eclipse.jface.viewers.IOpenListener;
  import org.eclipse.jface.viewers.ISelectionProvider;
  import org.eclipse.jface.viewers.OpenEvent;
  import org.eclipse.jface.viewers.StructuredSelection;
  import org.eclipse.jface.viewers.TreeViewer;
  import org.eclipse.swt.SWT;
  import org.eclipse.swt.events.KeyListener;
  import org.eclipse.swt.layout.GridData;
  import org.eclipse.swt.widgets.Composite;
  import org.eclipse.swt.widgets.Menu;
  import org.eclipse.swt.widgets.Tree;
  import org.eclipse.ui.IWorkbenchPartSite;
  import org.eclipse.wst.jsdt.internal.corext.callhierarchy.MethodWrapper;
  import org.eclipse.wst.jsdt.internal.ui.viewsupport.ColoredViewersManager;
  
  class CallHierarchyViewer extends TreeViewer {
      private CallHierarchyViewPart fPart;
  
      private OpenLocationAction fOpen;
  
      private CallHierarchyContentProvider fContentProvider;
  
      /**
       * @param parent the parent composite
       * @param part the call hierarchy view part
       */
      CallHierarchyViewer(Composite parent, CallHierarchyViewPart part) {
          super(new Tree(parent, SWT.MULTI));
  
          fPart = part;
  
          getControl().setLayoutData(new GridData(GridData.FILL_BOTH));
          setUseHashlookup(true);
          setAutoExpandLevel(2);
          fContentProvider = new CallHierarchyContentProvider(fPart);
          setContentProvider(fContentProvider);
          setLabelProvider(new CallHierarchyLabelProvider());
  
          fOpen= new OpenLocationAction(part, part.getSite());
          addOpenListener(new IOpenListener() {
              public void open(OpenEvent event) {
                  fOpen.run();
              }
          });
          
          ColoredViewersManager.install(this);
  
          clearViewer();
      }
  
      /**
       * @param wrapper
       */
      void setMethodWrapper(MethodWrapper wrapper) {
          setInput(getTreeRoot(wrapper));
  
          setFocus();
          setSelection(new StructuredSelection(wrapper), true);
      }
  
      CallHierarchyViewPart getPart() {
          return fPart;
      }
  
      /**
       *
       */
      void setFocus() {
          getControl().setFocus();
      }
  
      boolean isInFocus() {
          return getControl().isFocusControl();
      }
  
      /**
       * @param keyListener
       */
      void addKeyListener(KeyListener keyListener) {
          getControl().addKeyListener(keyListener);
      }
  
      /**
       * Wraps the root of a MethodWrapper tree in a dummy root in order to show
       * it in the tree.
       *
       * @param root The root of the MethodWrapper tree.
       * @return A new MethodWrapper which is a dummy root above the specified root.
       */
      private TreeRoot getTreeRoot(MethodWrapper root) {
          TreeRoot dummyRoot = new TreeRoot(root);
  
          return dummyRoot;
      }
  
      /**
       * Attaches a contextmenu listener to the tree
       * @param menuListener the menu listener
       * @param viewSite the view site
       * @param selectionProvider the selection provider
       */
      void initContextMenu(IMenuListener menuListener, IWorkbenchPartSite viewSite, ISelectionProvider selectionProvider) {
          MenuManager menuMgr= new MenuManager();
          menuMgr.setRemoveAllWhenShown(true);
          menuMgr.addMenuListener(menuListener);
          Menu menu= menuMgr.createContextMenu(getTree());
          getTree().setMenu(menu);
          viewSite.registerContextMenu(menuMgr, selectionProvider);
      }
  
      /**
       * 
       */
      void clearViewer() {
          setInput(TreeRoot.EMPTY_ROOT);
      }
      
      void cancelJobs() {
      	if (fPart == null)
      		return;
          fContentProvider.cancelJobs(fPart.getCurrentMethodWrapper());
      }
  }
  