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   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 net.sourceforge.phpdt.ui.IWorkingCopyProvider;
  17 import net.sourceforge.phpdt.ui.ProblemsLabelDecorator.ProblemsLabelChangedEvent;
  18
  19 import org.eclipse.core.resources.IResource;
  20 import org.eclipse.jface.viewers.IBaseLabelProvider;
  21 import org.eclipse.jface.viewers.LabelProviderChangedEvent;
  22 import org.eclipse.jface.viewers.TableViewer;
  23 import org.eclipse.swt.widgets.Composite;
  24 import org.eclipse.swt.widgets.Item;
  25 import org.eclipse.swt.widgets.Table;
  26 import org.eclipse.swt.widgets.Widget;
  27
  28 /**
  29  * Extends a TableViewer to allow more performance when showing error ticks. A
  30  * <code>ProblemItemMapper</code> is contained that maps all items in the tree
  31  * to underlying resource
  32  */
  33 public class ProblemTableViewer extends TableViewer {
  34
  35         protected ResourceToItemsMapper fResourceToItemsMapper;
  36
  37         /**
  38          * Constructor for ProblemTableViewer.
  39          *
  40          * @param parent
  41          */
  42         public ProblemTableViewer(Composite parent) {
  43                 super(parent);
  44                 initMapper();
  45         }
  46
  47         /**
  48          * Constructor for ProblemTableViewer.
  49          *
  50          * @param parent
  51          * @param style
  52          */
  53         public ProblemTableViewer(Composite parent, int style) {
  54                 super(parent, style);
  55                 initMapper();
  56         }
  57
  58         /**
  59          * Constructor for ProblemTableViewer.
  60          *
  61          * @param table
  62          */
  63         public ProblemTableViewer(Table table) {
  64                 super(table);
  65                 initMapper();
  66         }
  67
  68         private void initMapper() {
  69                 fResourceToItemsMapper = new ResourceToItemsMapper(this);
  70         }
  71
  72         /*
  73          * @see StructuredViewer#mapElement(Object, Widget)
  74          */
  75         protected void mapElement(Object element, Widget item) {
  76                 super.mapElement(element, item);
  77                 if (item instanceof Item) {
  78                         fResourceToItemsMapper.addToMap(element, (Item) item);
  79                 }
  80         }
  81
  82         /*
  83          * @see StructuredViewer#unmapElement(Object, Widget)
  84          */
  85         protected void unmapElement(Object element, Widget item) {
  86                 if (item instanceof Item) {
  87                         fResourceToItemsMapper.removeFromMap(element, (Item) item);
  88                 }
  89                 super.unmapElement(element, item);
  90         }
  91
  92         /*
  93          * @see StructuredViewer#unmapAllElements()
  94          */
  95         protected void unmapAllElements() {
  96                 fResourceToItemsMapper.clearMap();
  97                 super.unmapAllElements();
  98         }
  99
 100         /*
 101          * @see ContentViewer#handleLabelProviderChanged(LabelProviderChangedEvent)
 102          */
 103         protected void handleLabelProviderChanged(LabelProviderChangedEvent event) {
 104                 if (event instanceof ProblemsLabelChangedEvent) {
 105                         ProblemsLabelChangedEvent e = (ProblemsLabelChangedEvent) event;
 106                         if (!e.isMarkerChange() && canIgnoreChangesFromAnnotionModel()) {
 107                                 return;
 108                         }
 109                 }
 110
 111                 Object[] changed = event.getElements();
 112                 if (changed != null && !fResourceToItemsMapper.isEmpty()) {
 113                         ArrayList others = new ArrayList(changed.length);
 114                         for (int i = 0; i < changed.length; i++) {
 115                                 Object curr = changed[i];
 116                                 if (curr instanceof IResource) {
 117                                         fResourceToItemsMapper.resourceChanged((IResource) curr);
 118                                 } else {
 119                                         others.add(curr);
 120                                 }
 121                         }
 122                         if (others.isEmpty()) {
 123                                 return;
 124                         }
 125                         event = new LabelProviderChangedEvent((IBaseLabelProvider) event
 126                                         .getSource(), others.toArray());
 127                 }
 128                 super.handleLabelProviderChanged(event);
 129         }
 130
 131         /**
 132          * Answers whether this viewer can ignore label provider changes resulting
 133          * from marker changes in annotation models
 134          */
 135         private boolean canIgnoreChangesFromAnnotionModel() {
 136                 Object contentProvider = getContentProvider();
 137                 return contentProvider instanceof IWorkingCopyProvider
 138                                 && !((IWorkingCopyProvider) contentProvider)
 139                                                 .providesWorkingCopies();
 140         }
 141 }