net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/ui/viewsupport/ProblemTreeViewer.java

   1 /*******************************************************************************
   2  * Copyright (c) 2000, 2004 IBM Corporation and others.
   3  * All rights reserved. This program and the accompanying materials
   4  * are made available under the terms of the Common Public License v1.0
   5  * which accompanies this distribution, and is available at
   6  * http://www.eclipse.org/legal/cpl-v10.html
   7  *
   8  * Contributors:
   9  *     IBM Corporation - initial API and implementation
  10  *******************************************************************************/
  11
  12 package net.sourceforge.phpdt.internal.ui.viewsupport;
  13
  14 import java.util.ArrayList;
  15
  16 import org.eclipse.core.resources.IResource;
  17
  18 import org.eclipse.swt.widgets.Composite;
  19 import org.eclipse.swt.widgets.Item;
  20 import org.eclipse.swt.widgets.Tree;
  21 import org.eclipse.swt.widgets.Widget;
  22
  23 import org.eclipse.jface.viewers.IBaseLabelProvider;
  24 import org.eclipse.jface.viewers.LabelProviderChangedEvent;
  25 import org.eclipse.jface.viewers.TreeViewer;
  26
  27 import net.sourceforge.phpdt.core.IMember;
  28
  29 import net.sourceforge.phpdt.ui.IWorkingCopyProvider;
  30 import net.sourceforge.phpdt.ui.ProblemsLabelDecorator.ProblemsLabelChangedEvent;
  31
  32 /**
  33  * Extends a  TreeViewer to allow more performance when showing error ticks.
  34  * A <code>ProblemItemMapper</code> is contained that maps all items in
  35  * the tree to underlying resource
  36  */
  37 public class ProblemTreeViewer extends TreeViewer {
  38
  39         protected ResourceToItemsMapper fResourceToItemsMapper;
  40
  41         /*
  42          * @see TreeViewer#TreeViewer(Composite)
  43          */
  44         public ProblemTreeViewer(Composite parent) {
  45                 super(parent);
  46                 initMapper();
  47         }
  48
  49         /*
  50          * @see TreeViewer#TreeViewer(Composite, int)
  51          */
  52         public ProblemTreeViewer(Composite parent, int style) {
  53                 super(parent, style);
  54                 initMapper();
  55         }
  56
  57         /*
  58          * @see TreeViewer#TreeViewer(Tree)
  59          */
  60         public ProblemTreeViewer(Tree tree) {
  61                 super(tree);
  62                 initMapper();
  63         }
  64
  65         private void initMapper() {
  66                 fResourceToItemsMapper= new ResourceToItemsMapper(this);
  67         }
  68
  69
  70         /*
  71          * @see StructuredViewer#mapElement(Object, Widget)
  72          */
  73         protected void mapElement(Object element, Widget item) {
  74                 super.mapElement(element, item);
  75                 if (item instanceof Item) {
  76                         fResourceToItemsMapper.addToMap(element, (Item) item);
  77                 }
  78         }
  79
  80         /*
  81          * @see StructuredViewer#unmapElement(Object, Widget)
  82          */
  83         protected void unmapElement(Object element, Widget item) {
  84                 if (item instanceof Item) {
  85                         fResourceToItemsMapper.removeFromMap(element, (Item) item);
  86                 }
  87                 super.unmapElement(element, item);
  88         }
  89
  90         /*
  91          * @see StructuredViewer#unmapAllElements()
  92          */
  93         protected void unmapAllElements() {
  94                 fResourceToItemsMapper.clearMap();
  95                 super.unmapAllElements();
  96         }
  97
  98         /*
  99          * @see ContentViewer#handleLabelProviderChanged(LabelProviderChangedEvent)
 100          */
 101         protected void handleLabelProviderChanged(LabelProviderChangedEvent event) {
 102                 if (event instanceof ProblemsLabelChangedEvent) {
 103                         ProblemsLabelChangedEvent e= (ProblemsLabelChangedEvent) event;
 104                         if (!e.isMarkerChange() && canIgnoreChangesFromAnnotionModel()) {
 105                                 return;
 106                         }
 107                 }
 108
 109                 Object[] changed= event.getElements();
 110                 if (changed != null && !fResourceToItemsMapper.isEmpty()) {
 111                         ArrayList others= new ArrayList();
 112                         for (int i= 0; i < changed.length; i++) {
 113                                 Object curr= changed[i];
 114                                 if (curr instanceof IResource) {
 115                                         fResourceToItemsMapper.resourceChanged((IResource) curr);
 116                                 } else {
 117                                         others.add(curr);
 118                                 }
 119                         }
 120                         if (others.isEmpty()) {
 121                                 return;
 122                         }
 123                         event= new LabelProviderChangedEvent((IBaseLabelProvider) event.getSource(), others.toArray());
 124                 }
 125                 super.handleLabelProviderChanged(event);
 126         }
 127
 128         /**
 129          * Answers whether this viewer can ignore label provider changes resulting from
 130          * marker changes in annotation models
 131          */
 132         private boolean canIgnoreChangesFromAnnotionModel() {
 133                 Object contentProvider= getContentProvider();
 134                 return contentProvider instanceof IWorkingCopyProvider && !((IWorkingCopyProvider)contentProvider).providesWorkingCopies();
 135         }
 136
 137         /* (non-Javadoc)
 138          * @see org.eclipse.jface.viewers.AbstractTreeViewer#isExpandable(java.lang.Object)
 139          */
 140         public boolean isExpandable(Object element) {
 141                 // workaround for 65762
 142                 if (hasFilters() && element instanceof IMember) {
 143                         return getFilteredChildren(element).length > 0;
 144                 }
 145                 return super.isExpandable(element);
 146         }
 147 }
 148