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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2008 IBM Corporation and others.
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3 * All rights reserved. This program and the accompanying materials
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4 * are made available under the terms of the Eclipse Public License v1.0
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5 * which accompanies this distribution, and is available at
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6 * http://www.eclipse.org/legal/epl-v10.html
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7 *
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8 * Contributors:
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9 * IBM Corporation - initial API and implementation
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10 * Port to the D programming language:
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11 * Frank Benoit <benoit@tionex.de>
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12 *******************************************************************************/
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13
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14 module dwtx.jface.text.presentation.PresentationReconciler;
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15
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16 import dwt.dwthelper.utils;
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17
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18 import java.util.HashMap;
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19 import java.util.Iterator;
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20 import java.util.Map;
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21
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22 import dwt.custom.StyleRange;
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23 import dwtx.core.runtime.Assert;
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24 import dwtx.jface.text.BadLocationException;
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25 import dwtx.jface.text.BadPositionCategoryException;
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26 import dwtx.jface.text.DefaultPositionUpdater;
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27 import dwtx.jface.text.DocumentEvent;
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28 import dwtx.jface.text.DocumentPartitioningChangedEvent;
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29 import dwtx.jface.text.IDocument;
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30 import dwtx.jface.text.IDocumentExtension3;
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31 import dwtx.jface.text.IDocumentListener;
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32 import dwtx.jface.text.IDocumentPartitioningListener;
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33 import dwtx.jface.text.IDocumentPartitioningListenerExtension;
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34 import dwtx.jface.text.IDocumentPartitioningListenerExtension2;
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35 import dwtx.jface.text.IPositionUpdater;
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36 import dwtx.jface.text.IRegion;
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37 import dwtx.jface.text.ITextInputListener;
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38 import dwtx.jface.text.ITextListener;
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39 import dwtx.jface.text.ITextViewer;
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40 import dwtx.jface.text.ITextViewerExtension5;
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41 import dwtx.jface.text.ITypedRegion;
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42 import dwtx.jface.text.Region;
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43 import dwtx.jface.text.TextEvent;
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44 import dwtx.jface.text.TextPresentation;
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45 import dwtx.jface.text.TextUtilities;
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46 import dwtx.jface.text.TypedPosition;
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47
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48
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49
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50 /**
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51 * Standard implementation of <code>IPresentationReconciler</code>. This
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52 * implementation assumes that the tasks performed by its presentation damagers
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53 * and repairers are lightweight and of low cost. This presentation reconciler
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54 * runs in the UI thread and always repairs the complete damage caused by a
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55 * document change rather than just the portion overlapping with the viewer's
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56 * viewport.
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57 * <p>
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58 * Usually, clients instantiate this class and configure it before using it.
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59 * </p>
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60 */
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61 public class PresentationReconciler : IPresentationReconciler, IPresentationReconcilerExtension {
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62
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63 /** Prefix of the name of the position category for tracking damage regions. */
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64 protected final static String TRACKED_PARTITION= "__reconciler_tracked_partition"; //$NON-NLS-1$
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65
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66
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67 /**
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68 * Internal listener class.
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69 */
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70 class InternalListener :
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71 ITextInputListener, IDocumentListener, ITextListener,
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72 IDocumentPartitioningListener, IDocumentPartitioningListenerExtension, IDocumentPartitioningListenerExtension2 {
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73
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74 /** Set to <code>true</code> if between a document about to be changed and a changed event. */
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75 private bool fDocumentChanging= false;
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76 /**
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77 * The cached redraw state of the text viewer.
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78 * @since 3.0
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79 */
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80 private bool fCachedRedrawState= true;
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81
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82 /*
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83 * @see ITextInputListener#inputDocumentAboutToBeChanged(IDocument, IDocument)
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84 */
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85 public void inputDocumentAboutToBeChanged(IDocument oldDocument, IDocument newDocument) {
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86 if (oldDocument !is null) {
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87 try {
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88
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89 fViewer.removeTextListener(this);
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90 oldDocument.removeDocumentListener(this);
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91 oldDocument.removeDocumentPartitioningListener(this);
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92
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93 oldDocument.removePositionUpdater(fPositionUpdater);
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94 oldDocument.removePositionCategory(fPositionCategory);
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95
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96 } catch (BadPositionCategoryException x) {
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97 // should not happened for former input documents;
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98 }
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99 }
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100 }
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101
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102 /*
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103 * @see ITextInputListener#inputDocumenChanged(IDocument, IDocument)
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104 */
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105 public void inputDocumentChanged(IDocument oldDocument, IDocument newDocument) {
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106
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107 fDocumentChanging= false;
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108 fCachedRedrawState= true;
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109
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110 if (newDocument !is null) {
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111
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112 newDocument.addPositionCategory(fPositionCategory);
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113 newDocument.addPositionUpdater(fPositionUpdater);
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114
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115 newDocument.addDocumentPartitioningListener(this);
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116 newDocument.addDocumentListener(this);
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117 fViewer.addTextListener(this);
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118
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119 setDocumentToDamagers(newDocument);
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120 setDocumentToRepairers(newDocument);
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121 processDamage(new Region(0, newDocument.getLength()), newDocument);
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122 }
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123 }
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124
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125 /*
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126 * @see IDocumentPartitioningListener#documentPartitioningChanged(IDocument)
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127 */
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128 public void documentPartitioningChanged(IDocument document) {
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129 if (!fDocumentChanging && fCachedRedrawState)
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130 processDamage(new Region(0, document.getLength()), document);
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131 else
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132 fDocumentPartitioningChanged= true;
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133 }
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134
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135 /*
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136 * @see IDocumentPartitioningListenerExtension#documentPartitioningChanged(IDocument, IRegion)
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137 * @since 2.0
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138 */
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139 public void documentPartitioningChanged(IDocument document, IRegion changedRegion) {
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140 if (!fDocumentChanging && fCachedRedrawState) {
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141 processDamage(new Region(changedRegion.getOffset(), changedRegion.getLength()), document);
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142 } else {
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143 fDocumentPartitioningChanged= true;
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144 fChangedDocumentPartitions= changedRegion;
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145 }
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146 }
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147
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148 /*
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149 * @see dwtx.jface.text.IDocumentPartitioningListenerExtension2#documentPartitioningChanged(dwtx.jface.text.DocumentPartitioningChangedEvent)
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150 * @since 3.0
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151 */
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152 public void documentPartitioningChanged(DocumentPartitioningChangedEvent event) {
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153 IRegion changedRegion= event.getChangedRegion(getDocumentPartitioning());
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154 if (changedRegion !is null)
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155 documentPartitioningChanged(event.getDocument(), changedRegion);
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156 }
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157
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158 /*
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159 * @see IDocumentListener#documentAboutToBeChanged(DocumentEvent)
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160 */
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161 public void documentAboutToBeChanged(DocumentEvent e) {
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162
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163 fDocumentChanging= true;
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164 if (fCachedRedrawState) {
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165 try {
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166 int offset= e.getOffset() + e.getLength();
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167 ITypedRegion region= getPartition(e.getDocument(), offset);
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168 fRememberedPosition= new TypedPosition(region);
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169 e.getDocument().addPosition(fPositionCategory, fRememberedPosition);
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170 } catch (BadLocationException x) {
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171 // can not happen
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172 } catch (BadPositionCategoryException x) {
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173 // should not happen on input elements
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174 }
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175 }
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176 }
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177
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178 /*
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179 * @see IDocumentListener#documentChanged(DocumentEvent)
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180 */
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181 public void documentChanged(DocumentEvent e) {
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182 if (fCachedRedrawState) {
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183 try {
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184 e.getDocument().removePosition(fPositionCategory, fRememberedPosition);
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185 } catch (BadPositionCategoryException x) {
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186 // can not happen on input documents
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187 }
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188 }
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189 fDocumentChanging= false;
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190 }
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191
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192 /*
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193 * @see ITextListener#textChanged(TextEvent)
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194 */
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195 public void textChanged(TextEvent e) {
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196
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197 fCachedRedrawState= e.getViewerRedrawState();
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198 if (!fCachedRedrawState)
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199 return;
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200
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201 IRegion damage= null;
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202 IDocument document= null;
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203
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204 if (e.getDocumentEvent() is null) {
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205 document= fViewer.getDocument();
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206 if (document !is null) {
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207 if (e.getOffset() is 0 && e.getLength() is 0 && e.getText() is null) {
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208 // redraw state change, damage the whole document
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209 damage= new Region(0, document.getLength());
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210 } else {
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211 IRegion region= widgetRegion2ModelRegion(e);
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212 try {
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213 String text= document.get(region.getOffset(), region.getLength());
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214 DocumentEvent de= new DocumentEvent(document, region.getOffset(), region.getLength(), text);
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215 damage= getDamage(de, false);
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216 } catch (BadLocationException x) {
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217 }
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218 }
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219 }
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220 } else {
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221 DocumentEvent de= e.getDocumentEvent();
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222 document= de.getDocument();
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223 damage= getDamage(de, true);
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224 }
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225
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226 if (damage !is null && document !is null)
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227 processDamage(damage, document);
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228
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229 fDocumentPartitioningChanged= false;
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230 fChangedDocumentPartitions= null;
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231 }
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232
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233 /**
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234 * Translates the given text event into the corresponding range of the viewer's document.
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235 *
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236 * @param e the text event
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237 * @return the widget region corresponding the region of the given event
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238 * @since 2.1
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239 */
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240 protected IRegion widgetRegion2ModelRegion(TextEvent e) {
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241
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242 String text= e.getText();
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243 int length= text is null ? 0 : text.length();
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244
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245 if (fViewer instanceof ITextViewerExtension5) {
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246 ITextViewerExtension5 extension= (ITextViewerExtension5) fViewer;
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247 return extension.widgetRange2ModelRange(new Region(e.getOffset(), length));
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248 }
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249
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250 IRegion visible= fViewer.getVisibleRegion();
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251 IRegion region= new Region(e.getOffset() + visible.getOffset(), length);
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252 return region;
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253 }
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254 }
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255
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256 /** The map of presentation damagers. */
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257 private Map fDamagers;
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258 /** The map of presentation repairers. */
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259 private Map fRepairers;
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260 /** The target viewer. */
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261 private ITextViewer fViewer;
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262 /** The internal listener. */
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263 private InternalListener fInternalListener= new InternalListener();
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264 /** The name of the position category to track damage regions. */
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265 private String fPositionCategory;
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266 /** The position updated for the damage regions' position category. */
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267 private IPositionUpdater fPositionUpdater;
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268 /** The positions representing the damage regions. */
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269 private TypedPosition fRememberedPosition;
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270 /** Flag indicating the receipt of a partitioning changed notification. */
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271 private bool fDocumentPartitioningChanged= false;
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272 /** The range covering the changed partitioning. */
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273 private IRegion fChangedDocumentPartitions= null;
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274 /**
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275 * The partitioning used by this presentation reconciler.
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276 * @since 3.0
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277 */
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278 private String fPartitioning;
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279
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280 /**
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281 * Creates a new presentation reconciler. There are no damagers or repairers
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282 * registered with this reconciler by default. The default partitioning
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283 * <code>IDocumentExtension3.DEFAULT_PARTITIONING</code> is used.
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284 */
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285 public PresentationReconciler() {
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286 super();
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287 fPartitioning= IDocumentExtension3.DEFAULT_PARTITIONING;
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288 fPositionCategory= TRACKED_PARTITION + hashCode();
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289 fPositionUpdater= new DefaultPositionUpdater(fPositionCategory);
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290 }
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291
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292 /**
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293 * Sets the document partitioning for this presentation reconciler.
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294 *
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295 * @param partitioning the document partitioning for this presentation reconciler.
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296 * @since 3.0
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297 */
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298 public void setDocumentPartitioning(String partitioning) {
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299 Assert.isNotNull(partitioning);
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300 fPartitioning= partitioning;
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301 }
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302
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303 /*
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304 * @see dwtx.jface.text.presentation.IPresentationReconcilerExtension#geDocumenttPartitioning()
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305 * @since 3.0
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306 */
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307 public String getDocumentPartitioning() {
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308 return fPartitioning;
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309 }
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310
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311 /**
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312 * Registers the given presentation damager for a particular content type.
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313 * If there is already a damager registered for this type, the old damager
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314 * is removed first.
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315 *
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316 * @param damager the presentation damager to register, or <code>null</code> to remove an existing one
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317 * @param contentType the content type under which to register
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318 */
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319 public void setDamager(IPresentationDamager damager, String contentType) {
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320
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321 Assert.isNotNull(contentType);
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322
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323 if (fDamagers is null)
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324 fDamagers= new HashMap();
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325
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326 if (damager is null)
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327 fDamagers.remove(contentType);
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328 else
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329 fDamagers.put(contentType, damager);
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330 }
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331
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332 /**
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333 * Registers the given presentation repairer for a particular content type.
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334 * If there is already a repairer registered for this type, the old repairer
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335 * is removed first.
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336 *
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337 * @param repairer the presentation repairer to register, or <code>null</code> to remove an existing one
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338 * @param contentType the content type under which to register
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339 */
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340 public void setRepairer(IPresentationRepairer repairer, String contentType) {
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341
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342 Assert.isNotNull(contentType);
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343
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344 if (fRepairers is null)
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345 fRepairers= new HashMap();
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346
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347 if (repairer is null)
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348 fRepairers.remove(contentType);
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349 else
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350 fRepairers.put(contentType, repairer);
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351 }
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352
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353 /*
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354 * @see IPresentationReconciler#install(ITextViewer)
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355 */
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356 public void install(ITextViewer viewer) {
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357 Assert.isNotNull(viewer);
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358
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359 fViewer= viewer;
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360 fViewer.addTextInputListener(fInternalListener);
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361
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362 IDocument document= viewer.getDocument();
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363 if (document !is null)
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364 fInternalListener.inputDocumentChanged(null, document);
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365 }
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366
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367 /*
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368 * @see IPresentationReconciler#uninstall()
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369 */
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370 public void uninstall() {
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371 fViewer.removeTextInputListener(fInternalListener);
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372
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373 // Ensure we uninstall all listeners
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374 fInternalListener.inputDocumentAboutToBeChanged(fViewer.getDocument(), null);
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375 }
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376
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377 /*
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378 * @see IPresentationReconciler#getDamager(String)
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379 */
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380 public IPresentationDamager getDamager(String contentType) {
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381
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382 if (fDamagers is null)
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383 return null;
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384
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385 return (IPresentationDamager) fDamagers.get(contentType);
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386 }
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387
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388 /*
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389 * @see IPresentationReconciler#getRepairer(String)
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390 */
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391 public IPresentationRepairer getRepairer(String contentType) {
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392
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393 if (fRepairers is null)
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394 return null;
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395
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396 return (IPresentationRepairer) fRepairers.get(contentType);
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397 }
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398
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399 /**
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400 * Informs all registered damagers about the document on which they will work.
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401 *
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402 * @param document the document on which to work
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403 */
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404 protected void setDocumentToDamagers(IDocument document) {
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405 if (fDamagers !is null) {
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406 Iterator e= fDamagers.values().iterator();
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407 while (e.hasNext()) {
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408 IPresentationDamager damager= (IPresentationDamager) e.next();
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409 damager.setDocument(document);
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410 }
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411 }
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412 }
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413
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414 /**
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415 * Informs all registered repairers about the document on which they will work.
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416 *
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417 * @param document the document on which to work
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418 */
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419 protected void setDocumentToRepairers(IDocument document) {
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420 if (fRepairers !is null) {
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421 Iterator e= fRepairers.values().iterator();
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422 while (e.hasNext()) {
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423 IPresentationRepairer repairer= (IPresentationRepairer) e.next();
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424 repairer.setDocument(document);
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425 }
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426 }
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427 }
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428
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429 /**
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430 * Constructs a "repair description" for the given damage and returns this
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431 * description as a text presentation. For this, it queries the partitioning
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432 * of the damage region and asks the appropriate presentation repairer for
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433 * each partition to construct the "repair description" for this partition.
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434 *
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435 * @param damage the damage to be repaired
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436 * @param document the document whose presentation must be repaired
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437 * @return the presentation repair description as text presentation or
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438 * <code>null</code> if the partitioning could not be computed
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439 */
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440 protected TextPresentation createPresentation(IRegion damage, IDocument document) {
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441 try {
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442 if (fRepairers is null || fRepairers.isEmpty()) {
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443 TextPresentation presentation= new TextPresentation(damage, 100);
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444 presentation.setDefaultStyleRange(new StyleRange(damage.getOffset(), damage.getLength(), null, null));
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445 return presentation;
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446 }
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447
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448 TextPresentation presentation= new TextPresentation(damage, 1000);
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449
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450 ITypedRegion[] partitioning= TextUtilities.computePartitioning(document, getDocumentPartitioning(), damage.getOffset(), damage.getLength(), false);
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451 for (int i= 0; i < partitioning.length; i++) {
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452 ITypedRegion r= partitioning[i];
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453 IPresentationRepairer repairer= getRepairer(r.getType());
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454 if (repairer !is null)
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455 repairer.createPresentation(presentation, r);
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456 }
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457
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458 return presentation;
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459
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460 } catch (BadLocationException x) {
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461 return null;
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462 }
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463 }
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464
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465
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466 /**
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467 * Checks for the first and the last affected partition affected by a
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468 * document event and calls their damagers. Invalidates everything from the
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469 * start of the damage for the first partition until the end of the damage
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470 * for the last partition.
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471 *
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472 * @param e the event describing the document change
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473 * @param optimize <code>true</code> if partition changes should be
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474 * considered for optimization
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475 * @return the damaged caused by the change or <code>null</code> if
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476 * computing the partitioning failed
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477 * @since 3.0
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478 */
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479 private IRegion getDamage(DocumentEvent e, bool optimize) {
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480 int length= e.getText() is null ? 0 : e.getText().length();
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481
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482 if (fDamagers is null || fDamagers.isEmpty()) {
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483 length= Math.max(e.getLength(), length);
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484 length= Math.min(e.getDocument().getLength() - e.getOffset(), length);
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485 return new Region(e.getOffset(), length);
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486 }
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487
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488 bool isDeletion= length is 0;
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489 IRegion damage= null;
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490 try {
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491 int offset= e.getOffset();
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492 if (isDeletion)
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493 offset= Math.max(0, offset - 1);
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494 ITypedRegion partition= getPartition(e.getDocument(), offset);
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495 IPresentationDamager damager= getDamager(partition.getType());
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496 if (damager is null)
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497 return null;
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498
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499 IRegion r= damager.getDamageRegion(partition, e, fDocumentPartitioningChanged);
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500
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501 if (!fDocumentPartitioningChanged && optimize && !isDeletion) {
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502 damage= r;
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503 } else {
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504
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505 int damageEnd= getDamageEndOffset(e);
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506
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507 int parititionDamageEnd= -1;
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508 if (fChangedDocumentPartitions !is null)
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509 parititionDamageEnd= fChangedDocumentPartitions.getOffset() + fChangedDocumentPartitions.getLength();
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510
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511 int end= Math.max(damageEnd, parititionDamageEnd);
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512
|
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|
513 damage= end is -1 ? r : new Region(r.getOffset(), end - r.getOffset());
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|
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514 }
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515
|
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|
516 } catch (BadLocationException x) {
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517 }
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518
|
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|
519 return damage;
|
|
|
520 }
|
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|
521
|
|
|
522 /**
|
|
|
523 * Returns the end offset of the damage. If a partition has been split by
|
|
|
524 * the given document event also the second half of the original
|
|
|
525 * partition must be considered. This is achieved by using the remembered
|
|
|
526 * partition range.
|
|
|
527 *
|
|
|
528 * @param e the event describing the change
|
|
|
529 * @return the damage end offset (excluding)
|
|
|
530 * @exception BadLocationException if method accesses invalid offset
|
|
|
531 */
|
|
|
532 private int getDamageEndOffset(DocumentEvent e) throws BadLocationException {
|
|
|
533
|
|
|
534 IDocument d= e.getDocument();
|
|
|
535
|
|
|
536 int length= 0;
|
|
|
537 if (e.getText() !is null) {
|
|
|
538 length= e.getText().length();
|
|
|
539 if (length > 0)
|
|
|
540 -- length;
|
|
|
541 }
|
|
|
542
|
|
|
543 ITypedRegion partition= getPartition(d, e.getOffset() + length);
|
|
|
544 int endOffset= partition.getOffset() + partition.getLength();
|
|
|
545 if (endOffset is e.getOffset())
|
|
|
546 return -1;
|
|
|
547
|
|
|
548 int end= fRememberedPosition is null ? -1 : fRememberedPosition.getOffset() + fRememberedPosition.getLength();
|
|
|
549 if (endOffset < end && end < d.getLength())
|
|
|
550 partition= getPartition(d, end);
|
|
|
551
|
|
|
552 IPresentationDamager damager= getDamager(partition.getType());
|
|
|
553 if (damager is null)
|
|
|
554 return -1;
|
|
|
555
|
|
|
556 IRegion r= damager.getDamageRegion(partition, e, fDocumentPartitioningChanged);
|
|
|
557
|
|
|
558 return r.getOffset() + r.getLength();
|
|
|
559 }
|
|
|
560
|
|
|
561 /**
|
|
|
562 * Processes the given damage.
|
|
|
563 * @param damage the damage to be repaired
|
|
|
564 * @param document the document whose presentation must be repaired
|
|
|
565 */
|
|
|
566 private void processDamage(IRegion damage, IDocument document) {
|
|
|
567 if (damage !is null && damage.getLength() > 0) {
|
|
|
568 TextPresentation p= createPresentation(damage, document);
|
|
|
569 if (p !is null)
|
|
|
570 applyTextRegionCollection(p);
|
|
|
571 }
|
|
|
572 }
|
|
|
573
|
|
|
574 /**
|
|
|
575 * Applies the given text presentation to the text viewer the presentation
|
|
|
576 * reconciler is installed on.
|
|
|
577 *
|
|
|
578 * @param presentation the text presentation to be applied to the text viewer
|
|
|
579 */
|
|
|
580 private void applyTextRegionCollection(TextPresentation presentation) {
|
|
|
581 fViewer.changeTextPresentation(presentation, false);
|
|
|
582 }
|
|
|
583
|
|
|
584 /**
|
|
|
585 * Returns the partition for the given offset in the given document.
|
|
|
586 *
|
|
|
587 * @param document the document
|
|
|
588 * @param offset the offset
|
|
|
589 * @return the partition
|
|
|
590 * @throws BadLocationException if offset is invalid in the given document
|
|
|
591 * @since 3.0
|
|
|
592 */
|
|
|
593 private ITypedRegion getPartition(IDocument document, int offset) throws BadLocationException {
|
|
|
594 return TextUtilities.getPartition(document, getDocumentPartitioning(), offset, false);
|
|
|
595 }
|
|
|
596 }
|
