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