Mercurial > projects > dwt-addons
annotate dwtx/text/undo/DocumentUndoManager.d @ 161:f8d52b926852
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| author | Frank Benoit <benoit@tionex.de> |
|---|---|
| date | Wed, 27 Aug 2008 14:49:30 +0200 |
| parents | 3678e4f1a766 |
| children | c3583c6ec027 |
| rev | line source |
|---|---|
| 129 | 1 /******************************************************************************* |
| 2 * Copyright (c) 2006, 2008 IBM Corporation and others. | |
| 3 * All rights reserved. This program and the accompanying materials | |
| 4 * are made available under the terms of the Eclipse Public License v1.0 | |
| 5 * which accompanies this distribution, and is available at | |
| 6 * http://www.eclipse.org/legal/epl-v10.html | |
| 7 * | |
| 8 * Contributors: | |
| 9 * IBM Corporation - initial API and implementation | |
| 10 * Port to the D programming language: | |
| 11 * Frank Benoit <benoit@tionex.de> | |
| 12 *******************************************************************************/ | |
| 13 module dwtx.text.undo.DocumentUndoManager; | |
| 14 | |
| 131 | 15 import dwtx.text.undo.DocumentUndoManagerRegistry; // packageimport |
| 16 import dwtx.text.undo.DocumentUndoEvent; // packageimport | |
| 17 import dwtx.text.undo.IDocumentUndoListener; // packageimport | |
| 18 import dwtx.text.undo.UndoMessages; // packageimport | |
| 19 import dwtx.text.undo.IDocumentUndoManager; // packageimport | |
| 20 | |
| 21 | |
| 129 | 22 import dwt.dwthelper.utils; |
| 23 | |
|
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24 import dwtx.dwtxhelper.Collection; |
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25 |
| 129 | 26 |
| 27 import dwtx.core.commands.ExecutionException; | |
| 28 import dwtx.core.commands.operations.AbstractOperation; | |
| 29 import dwtx.core.commands.operations.IContextReplacingOperation; | |
| 30 import dwtx.core.commands.operations.IOperationHistory; | |
| 31 import dwtx.core.commands.operations.IOperationHistoryListener; | |
| 32 import dwtx.core.commands.operations.IUndoContext; | |
| 33 import dwtx.core.commands.operations.IUndoableOperation; | |
| 34 import dwtx.core.commands.operations.ObjectUndoContext; | |
| 35 import dwtx.core.commands.operations.OperationHistoryEvent; | |
| 36 import dwtx.core.commands.operations.OperationHistoryFactory; | |
| 37 import dwtx.core.runtime.Assert; | |
| 38 import dwtx.core.runtime.IAdaptable; | |
| 39 import dwtx.core.runtime.IProgressMonitor; | |
| 40 import dwtx.core.runtime.IStatus; | |
| 41 import dwtx.core.runtime.ListenerList; | |
| 42 import dwtx.core.runtime.Status; | |
| 43 import dwtx.jface.text.BadLocationException; | |
| 44 import dwtx.jface.text.DocumentEvent; | |
| 45 import dwtx.jface.text.IDocument; | |
| 46 import dwtx.jface.text.IDocumentExtension4; | |
| 47 import dwtx.jface.text.IDocumentListener; | |
| 48 import dwtx.jface.text.TextUtilities; | |
| 49 | |
| 50 /** | |
| 51 * A standard implementation of a document-based undo manager that | |
| 52 * creates an undo history based on changes to its document. | |
| 53 * <p> | |
| 54 * Based on the 3.1 implementation of DefaultUndoManager, it was implemented | |
| 55 * using the document-related manipulations defined in the original | |
| 56 * DefaultUndoManager, by separating the document manipulations from the | |
| 57 * viewer-specific processing.</p> | |
| 58 * <p> | |
| 59 * The classes representing individual text edits (formerly text commands) | |
| 60 * were promoted from inner types to their own classes in order to support | |
| 61 * reassignment to a different undo manager.<p> | |
| 62 * <p> | |
| 63 * This class is not intended to be subclassed. | |
| 64 * </p> | |
| 130 | 65 * |
| 129 | 66 * @see IDocumentUndoManager |
| 67 * @see DocumentUndoManagerRegistry | |
| 68 * @see IDocumentUndoListener | |
| 69 * @see dwtx.jface.text.IDocument | |
| 70 * @since 3.2 | |
| 71 * @noextend This class is not intended to be subclassed by clients. | |
| 72 */ | |
| 73 public class DocumentUndoManager : IDocumentUndoManager { | |
| 130 | 74 |
| 75 | |
| 129 | 76 /** |
| 77 * Represents an undo-able text change, described as the | |
| 78 * replacement of some preserved text with new text. | |
| 79 * <p> | |
| 80 * Based on the DefaultUndoManager.TextCommand from R3.1. | |
| 81 * </p> | |
| 82 */ | |
| 83 private static class UndoableTextChange : AbstractOperation { | |
| 84 | |
| 85 /** The start index of the replaced text. */ | |
| 86 protected int fStart= -1; | |
| 87 | |
| 88 /** The end index of the replaced text. */ | |
| 89 protected int fEnd= -1; | |
| 90 | |
| 91 /** The newly inserted text. */ | |
| 92 protected String fText; | |
| 93 | |
| 94 /** The replaced text. */ | |
| 95 protected String fPreservedText; | |
| 96 | |
| 97 /** The undo modification stamp. */ | |
| 98 protected long fUndoModificationStamp= IDocumentExtension4.UNKNOWN_MODIFICATION_STAMP; | |
| 99 | |
| 100 /** The redo modification stamp. */ | |
| 101 protected long fRedoModificationStamp= IDocumentExtension4.UNKNOWN_MODIFICATION_STAMP; | |
| 102 | |
| 103 /** The undo manager that generated the change. */ | |
| 104 protected DocumentUndoManager fDocumentUndoManager; | |
| 105 | |
| 106 /** | |
| 107 * Creates a new text change. | |
| 130 | 108 * |
| 129 | 109 * @param manager the undo manager for this change |
| 110 */ | |
| 130 | 111 this(DocumentUndoManager manager) { |
| 129 | 112 super(UndoMessages.getString("DocumentUndoManager.operationLabel")); //$NON-NLS-1$ |
| 113 this.fDocumentUndoManager= manager; | |
| 114 addContext(manager.getUndoContext()); | |
| 115 } | |
| 116 | |
| 117 /** | |
| 118 * Re-initializes this text change. | |
| 119 */ | |
| 120 protected void reinitialize() { | |
| 121 fStart= fEnd= -1; | |
| 122 fText= fPreservedText= null; | |
| 123 fUndoModificationStamp= IDocumentExtension4.UNKNOWN_MODIFICATION_STAMP; | |
| 124 fRedoModificationStamp= IDocumentExtension4.UNKNOWN_MODIFICATION_STAMP; | |
| 125 } | |
| 126 | |
| 127 /** | |
| 128 * Sets the start and the end index of this change. | |
| 130 | 129 * |
| 129 | 130 * @param start the start index |
| 131 * @param end the end index | |
| 132 */ | |
| 133 protected void set(int start, int end) { | |
| 134 fStart= start; | |
| 135 fEnd= end; | |
| 136 fText= null; | |
| 137 fPreservedText= null; | |
| 138 } | |
| 139 | |
| 140 /* | |
| 141 * @see dwtx.core.commands.operations.IUndoableOperation#dispose() | |
| 142 */ | |
| 143 public void dispose() { | |
| 144 reinitialize(); | |
| 145 } | |
| 146 | |
| 147 /** | |
| 148 * Undo the change described by this change. | |
| 149 */ | |
| 150 protected void undoTextChange() { | |
| 151 try { | |
|
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152 if (auto de4 = cast(IDocumentExtension4)fDocumentUndoManager.fDocument ) |
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153 de4.replace(fStart, fText |
| 129 | 154 .length(), fPreservedText, fUndoModificationStamp); |
| 155 else | |
| 156 fDocumentUndoManager.fDocument.replace(fStart, fText.length(), | |
| 157 fPreservedText); | |
| 158 } catch (BadLocationException x) { | |
| 159 } | |
| 160 } | |
| 161 | |
| 162 /* | |
| 163 * @see dwtx.core.commands.operations.IUndoableOperation#canUndo() | |
| 164 */ | |
| 165 public bool canUndo() { | |
| 166 if (isValid()) { | |
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167 if (cast(IDocumentExtension4)fDocumentUndoManager.fDocument) { |
| 134 | 168 long docStamp= (cast(IDocumentExtension4) fDocumentUndoManager.fDocument) |
| 129 | 169 .getModificationStamp(); |
| 170 | |
| 171 // Normal case: an undo is valid if its redo will restore | |
| 172 // document to its current modification stamp | |
| 173 bool canUndo= docStamp is IDocumentExtension4.UNKNOWN_MODIFICATION_STAMP | |
| 174 || docStamp is getRedoModificationStamp(); | |
| 175 | |
| 176 /* | |
| 177 * Special case to check if the answer is false. If the last | |
| 178 * document change was empty, then the document's modification | |
| 179 * stamp was incremented but nothing was committed. The | |
| 180 * operation being queried has an older stamp. In this case | |
| 181 * only, the comparison is different. A sequence of document | |
| 182 * changes that include an empty change is handled correctly | |
| 183 * when a valid commit follows the empty change, but when | |
| 184 * #canUndo() is queried just after an empty change, we must | |
| 185 * special case the check. The check is very specific to prevent | |
| 186 * false positives. see | |
| 187 * https://bugs.eclipse.org/bugs/show_bug.cgi?id=98245 | |
| 188 */ | |
| 189 if (!canUndo | |
| 190 && this is fDocumentUndoManager.fHistory | |
| 191 .getUndoOperation(fDocumentUndoManager.fUndoContext) | |
| 192 // this is the latest operation | |
| 193 && this !is fDocumentUndoManager.fCurrent | |
| 194 // there is a more current operation not on the stack | |
| 195 && !fDocumentUndoManager.fCurrent.isValid() | |
| 196 // the current operation is not a valid document | |
| 197 // modification | |
| 198 && fDocumentUndoManager.fCurrent.fUndoModificationStamp !is | |
| 199 // the invalid current operation has a document stamp | |
| 200 IDocumentExtension4.UNKNOWN_MODIFICATION_STAMP) { | |
| 201 canUndo= fDocumentUndoManager.fCurrent.fRedoModificationStamp is docStamp; | |
| 202 } | |
| 203 /* | |
| 204 * When the composite is the current operation, it may hold the | |
| 205 * timestamp of a no-op change. We check this here rather than | |
| 206 * in an override of canUndo() in UndoableCompoundTextChange simply to | |
| 207 * keep all the special case checks in one place. | |
| 208 */ | |
| 209 if (!canUndo | |
| 210 && this is fDocumentUndoManager.fHistory | |
| 211 .getUndoOperation(fDocumentUndoManager.fUndoContext) | |
| 212 && // this is the latest operation | |
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213 null !is cast(UndoableCompoundTextChange)this |
| 129 | 214 && this is fDocumentUndoManager.fCurrent |
| 215 && // this is the current operation | |
| 216 this.fStart is -1 | |
| 217 && // the current operation text is not valid | |
| 218 fDocumentUndoManager.fCurrent.fRedoModificationStamp !is IDocumentExtension4.UNKNOWN_MODIFICATION_STAMP) { | |
| 219 // but it has a redo stamp | |
| 220 canUndo= fDocumentUndoManager.fCurrent.fRedoModificationStamp is docStamp; | |
| 221 } | |
| 222 return canUndo; | |
| 223 | |
| 224 } | |
| 225 // if there is no timestamp to check, simply return true per the | |
| 226 // 3.0.1 behavior | |
| 227 return true; | |
| 228 } | |
| 229 return false; | |
| 230 } | |
| 231 | |
| 232 /* | |
| 233 * @see dwtx.core.commands.operations.IUndoableOperation#canRedo() | |
| 234 */ | |
| 235 public bool canRedo() { | |
| 236 if (isValid()) { | |
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237 if (cast(IDocumentExtension4)fDocumentUndoManager.fDocument ) { |
| 134 | 238 long docStamp= (cast(IDocumentExtension4) fDocumentUndoManager.fDocument) |
| 129 | 239 .getModificationStamp(); |
| 240 return docStamp is IDocumentExtension4.UNKNOWN_MODIFICATION_STAMP | |
| 241 || docStamp is getUndoModificationStamp(); | |
| 242 } | |
| 243 // if there is no timestamp to check, simply return true per the | |
| 244 // 3.0.1 behavior | |
| 245 return true; | |
| 246 } | |
| 247 return false; | |
| 248 } | |
| 249 | |
| 250 /* | |
| 251 * @see dwtx.core.commands.operations.IUndoableOperation#canExecute() | |
| 252 */ | |
| 253 public bool canExecute() { | |
| 254 return fDocumentUndoManager.isConnected(); | |
| 255 } | |
| 256 | |
| 257 /* | |
| 258 * @see dwtx.core.commands.operations.IUndoableOperation.IUndoableOperation#execute(IProgressMonitor, IAdaptable) | |
| 259 */ | |
| 260 public IStatus execute(IProgressMonitor monitor, IAdaptable uiInfo) { | |
| 261 // Text changes execute as they are typed, so executing one has no | |
| 262 // effect. | |
| 263 return Status.OK_STATUS; | |
| 264 } | |
| 265 | |
| 266 /** | |
| 267 * {@inheritDoc} | |
| 268 * Notifies clients about the undo. | |
| 269 */ | |
| 270 public IStatus undo(IProgressMonitor monitor, IAdaptable uiInfo) { | |
| 271 if (isValid()) { | |
| 161 | 272 fDocumentUndoManager.fireDocumentUndo(fStart, fPreservedText, fText, cast(Object)uiInfo, DocumentUndoEvent.ABOUT_TO_UNDO, false); |
| 129 | 273 undoTextChange(); |
| 274 fDocumentUndoManager.resetProcessChangeState(); | |
| 161 | 275 fDocumentUndoManager.fireDocumentUndo(fStart, fPreservedText, fText, cast(Object)uiInfo, DocumentUndoEvent.UNDONE, false); |
| 129 | 276 return Status.OK_STATUS; |
| 277 } | |
| 278 return IOperationHistory.OPERATION_INVALID_STATUS; | |
| 279 } | |
| 280 | |
| 281 /** | |
| 282 * Re-applies the change described by this change. | |
| 283 */ | |
| 284 protected void redoTextChange() { | |
| 285 try { | |
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286 if (cast(IDocumentExtension4)fDocumentUndoManager.fDocument) |
| 134 | 287 (cast(IDocumentExtension4) fDocumentUndoManager.fDocument).replace(fStart, fEnd - fStart, fText, fRedoModificationStamp); |
| 129 | 288 else |
| 289 fDocumentUndoManager.fDocument.replace(fStart, fEnd - fStart, fText); | |
| 290 } catch (BadLocationException x) { | |
| 291 } | |
| 292 } | |
| 293 | |
| 294 /** | |
| 295 * Re-applies the change described by this change that was previously | |
| 296 * undone. Also notifies clients about the redo. | |
| 130 | 297 * |
| 129 | 298 * @param monitor the progress monitor to use if necessary |
| 299 * @param uiInfo an adaptable that can provide UI info if needed | |
| 300 * @return the status | |
| 301 */ | |
| 302 public IStatus redo(IProgressMonitor monitor, IAdaptable uiInfo) { | |
| 303 if (isValid()) { | |
| 161 | 304 fDocumentUndoManager.fireDocumentUndo(fStart, fText, fPreservedText, cast(Object)uiInfo, DocumentUndoEvent.ABOUT_TO_REDO, false); |
| 129 | 305 redoTextChange(); |
| 306 fDocumentUndoManager.resetProcessChangeState(); | |
| 161 | 307 fDocumentUndoManager.fireDocumentUndo(fStart, fText, fPreservedText, cast(Object)uiInfo, DocumentUndoEvent.REDONE, false); |
| 129 | 308 return Status.OK_STATUS; |
| 309 } | |
| 310 return IOperationHistory.OPERATION_INVALID_STATUS; | |
| 311 } | |
| 312 | |
| 313 /** | |
| 314 * Update the change in response to a commit. | |
| 315 */ | |
| 316 | |
| 317 protected void updateTextChange() { | |
| 318 fText= fDocumentUndoManager.fTextBuffer.toString(); | |
| 161 | 319 fDocumentUndoManager.fTextBuffer.clear(); |
| 129 | 320 fPreservedText= fDocumentUndoManager.fPreservedTextBuffer.toString(); |
| 161 | 321 fDocumentUndoManager.fPreservedTextBuffer.clear(); |
| 129 | 322 } |
| 323 | |
| 324 /** | |
| 325 * Creates a new uncommitted text change depending on whether a compound | |
| 326 * change is currently being executed. | |
| 130 | 327 * |
| 129 | 328 * @return a new, uncommitted text change or a compound text change |
| 329 */ | |
| 330 protected UndoableTextChange createCurrent() { | |
| 331 if (fDocumentUndoManager.fFoldingIntoCompoundChange) | |
| 332 return new UndoableCompoundTextChange(fDocumentUndoManager); | |
| 333 return new UndoableTextChange(fDocumentUndoManager); | |
| 334 } | |
| 335 | |
| 336 /** | |
| 337 * Commits the current change into this one. | |
| 338 */ | |
| 339 protected void commit() { | |
| 340 if (fStart < 0) { | |
| 341 if (fDocumentUndoManager.fFoldingIntoCompoundChange) { | |
| 342 fDocumentUndoManager.fCurrent= createCurrent(); | |
| 343 } else { | |
| 344 reinitialize(); | |
| 345 } | |
| 346 } else { | |
| 347 updateTextChange(); | |
| 348 fDocumentUndoManager.fCurrent= createCurrent(); | |
| 349 } | |
| 350 fDocumentUndoManager.resetProcessChangeState(); | |
| 351 } | |
| 352 | |
| 353 /** | |
| 354 * Updates the text from the buffers without resetting the buffers or adding | |
| 355 * anything to the stack. | |
| 356 */ | |
| 357 protected void pretendCommit() { | |
| 358 if (fStart > -1) { | |
| 359 fText= fDocumentUndoManager.fTextBuffer.toString(); | |
| 360 fPreservedText= fDocumentUndoManager.fPreservedTextBuffer.toString(); | |
| 361 } | |
| 362 } | |
| 363 | |
| 364 /** | |
| 365 * Attempt a commit of this change and answer true if a new fCurrent was | |
| 366 * created as a result of the commit. | |
| 130 | 367 * |
| 129 | 368 * @return <code>true</code> if the change was committed and created |
| 369 * a new <code>fCurrent</code>, <code>false</code> if not | |
| 370 */ | |
| 371 protected bool attemptCommit() { | |
| 372 pretendCommit(); | |
| 373 if (isValid()) { | |
| 374 fDocumentUndoManager.commit(); | |
| 375 return true; | |
| 376 } | |
| 377 return false; | |
| 378 } | |
| 379 | |
| 380 /** | |
| 381 * Checks whether this text change is valid for undo or redo. | |
| 130 | 382 * |
| 129 | 383 * @return <code>true</code> if the change is valid for undo or redo |
| 384 */ | |
| 385 protected bool isValid() { | |
| 386 return fStart > -1 && fEnd > -1 && fText !is null; | |
| 387 } | |
| 388 | |
| 389 /* | |
| 390 * @see java.lang.Object#toString() | |
| 391 */ | |
| 160 | 392 public override String toString() { |
| 129 | 393 String delimiter= ", "; //$NON-NLS-1$ |
| 394 StringBuffer text= new StringBuffer(super.toString()); | |
| 395 text.append("\n"); //$NON-NLS-1$ | |
| 161 | 396 text.append(this.classinfo.name); |
| 129 | 397 text.append(" undo modification stamp: "); //$NON-NLS-1$ |
| 398 text.append(fUndoModificationStamp); | |
| 399 text.append(" redo modification stamp: "); //$NON-NLS-1$ | |
| 400 text.append(fRedoModificationStamp); | |
| 401 text.append(" start: "); //$NON-NLS-1$ | |
| 402 text.append(fStart); | |
| 403 text.append(delimiter); | |
| 404 text.append("end: "); //$NON-NLS-1$ | |
| 405 text.append(fEnd); | |
| 406 text.append(delimiter); | |
| 407 text.append("text: '"); //$NON-NLS-1$ | |
| 408 text.append(fText); | |
| 409 text.append('\''); | |
| 410 text.append(delimiter); | |
| 411 text.append("preservedText: '"); //$NON-NLS-1$ | |
| 412 text.append(fPreservedText); | |
| 413 text.append('\''); | |
| 414 return text.toString(); | |
| 415 } | |
| 416 | |
| 417 /** | |
| 418 * Return the undo modification stamp | |
| 130 | 419 * |
| 129 | 420 * @return the undo modification stamp for this change |
| 421 */ | |
| 422 protected long getUndoModificationStamp() { | |
| 423 return fUndoModificationStamp; | |
| 424 } | |
| 425 | |
| 426 /** | |
| 427 * Return the redo modification stamp | |
| 130 | 428 * |
| 129 | 429 * @return the redo modification stamp for this change |
| 430 */ | |
| 431 protected long getRedoModificationStamp() { | |
| 432 return fRedoModificationStamp; | |
| 433 } | |
| 434 } | |
| 130 | 435 |
| 436 | |
| 129 | 437 /** |
| 438 * Represents an undo-able text change consisting of several individual | |
| 439 * changes. | |
| 440 */ | |
| 441 private static class UndoableCompoundTextChange : UndoableTextChange { | |
| 442 | |
| 443 /** The list of individual changes */ | |
| 161 | 444 private List fChanges; |
| 129 | 445 |
| 446 /** | |
| 447 * Creates a new compound text change. | |
| 130 | 448 * |
| 129 | 449 * @param manager |
| 450 * the undo manager for this change | |
| 451 */ | |
| 130 | 452 this(DocumentUndoManager manager) { |
| 161 | 453 fChanges= new ArrayList(); |
| 129 | 454 super(manager); |
| 455 } | |
| 456 | |
| 457 /** | |
| 458 * Adds a new individual change to this compound change. | |
| 130 | 459 * |
| 129 | 460 * @param change the change to be added |
| 461 */ | |
| 462 protected void add(UndoableTextChange change) { | |
| 463 fChanges.add(change); | |
| 464 } | |
| 465 | |
| 466 /* | |
| 467 * @see dwtx.text.undo.UndoableTextChange#undo(dwtx.core.runtime.IProgressMonitor, dwtx.core.runtime.IAdaptable) | |
| 468 */ | |
| 469 public IStatus undo(IProgressMonitor monitor, IAdaptable uiInfo) { | |
| 470 | |
| 471 int size= fChanges.size(); | |
| 472 if (size > 0) { | |
| 473 UndoableTextChange c; | |
| 474 | |
| 134 | 475 c= cast(UndoableTextChange) fChanges.get(0); |
| 161 | 476 fDocumentUndoManager.fireDocumentUndo(c.fStart, c.fPreservedText, c.fText, cast(Object)uiInfo, DocumentUndoEvent.ABOUT_TO_UNDO, true); |
| 129 | 477 |
| 478 for (int i= size - 1; i >= 0; --i) { | |
| 134 | 479 c= cast(UndoableTextChange) fChanges.get(i); |
| 129 | 480 c.undoTextChange(); |
| 481 } | |
| 482 fDocumentUndoManager.resetProcessChangeState(); | |
| 161 | 483 fDocumentUndoManager.fireDocumentUndo(c.fStart, c.fPreservedText, c.fText, cast(Object)uiInfo, |
| 129 | 484 DocumentUndoEvent.UNDONE, true); |
| 485 } | |
| 486 return Status.OK_STATUS; | |
| 487 } | |
| 488 | |
| 489 /* | |
| 490 * @see dwtx.text.undo.UndoableTextChange#redo(dwtx.core.runtime.IProgressMonitor, dwtx.core.runtime.IAdaptable) | |
| 491 */ | |
| 492 public IStatus redo(IProgressMonitor monitor, IAdaptable uiInfo) { | |
| 493 | |
| 494 int size= fChanges.size(); | |
| 495 if (size > 0) { | |
| 496 | |
| 497 UndoableTextChange c; | |
| 134 | 498 c= cast(UndoableTextChange) fChanges.get(size - 1); |
| 161 | 499 fDocumentUndoManager.fireDocumentUndo(c.fStart, c.fText, c.fPreservedText, cast(Object)uiInfo, DocumentUndoEvent.ABOUT_TO_REDO, true); |
| 129 | 500 |
| 501 for (int i= 0; i <= size - 1; ++i) { | |
| 134 | 502 c= cast(UndoableTextChange) fChanges.get(i); |
| 129 | 503 c.redoTextChange(); |
| 504 } | |
| 505 fDocumentUndoManager.resetProcessChangeState(); | |
| 161 | 506 fDocumentUndoManager.fireDocumentUndo(c.fStart, c.fText, c.fPreservedText, cast(Object)uiInfo, DocumentUndoEvent.REDONE, true); |
| 129 | 507 } |
| 508 | |
| 509 return Status.OK_STATUS; | |
| 510 } | |
| 511 | |
| 512 /* | |
| 513 * @see dwtx.text.undo.UndoableTextChange#updateTextChange() | |
| 514 */ | |
| 515 protected void updateTextChange() { | |
| 516 // first gather the data from the buffers | |
| 517 super.updateTextChange(); | |
| 518 | |
| 519 // the result of the update is stored as a child change | |
| 520 UndoableTextChange c= new UndoableTextChange(fDocumentUndoManager); | |
| 521 c.fStart= fStart; | |
| 522 c.fEnd= fEnd; | |
| 523 c.fText= fText; | |
| 524 c.fPreservedText= fPreservedText; | |
| 525 c.fUndoModificationStamp= fUndoModificationStamp; | |
| 526 c.fRedoModificationStamp= fRedoModificationStamp; | |
| 527 add(c); | |
| 528 | |
| 529 // clear out all indexes now that the child is added | |
| 530 reinitialize(); | |
| 531 } | |
| 532 | |
| 533 /* | |
| 534 * @see dwtx.text.undo.UndoableTextChange#createCurrent() | |
| 535 */ | |
| 536 protected UndoableTextChange createCurrent() { | |
| 537 | |
| 538 if (!fDocumentUndoManager.fFoldingIntoCompoundChange) | |
| 539 return new UndoableTextChange(fDocumentUndoManager); | |
| 540 | |
| 541 reinitialize(); | |
| 542 return this; | |
| 543 } | |
| 544 | |
| 545 /* | |
| 546 * @see dwtx.text.undo.UndoableTextChange#commit() | |
| 547 */ | |
| 548 protected void commit() { | |
| 549 // if there is pending data, update the text change | |
| 550 if (fStart > -1) | |
| 551 updateTextChange(); | |
| 552 fDocumentUndoManager.fCurrent= createCurrent(); | |
| 553 fDocumentUndoManager.resetProcessChangeState(); | |
| 554 } | |
| 130 | 555 |
| 129 | 556 /* |
| 557 * @see dwtx.text.undo.UndoableTextChange#isValid() | |
| 558 */ | |
| 559 protected bool isValid() { | |
| 560 return fStart > -1 || fChanges.size() > 0; | |
| 561 } | |
| 562 | |
| 563 /* | |
| 564 * @see dwtx.text.undo.UndoableTextChange#getUndoModificationStamp() | |
| 565 */ | |
| 566 protected long getUndoModificationStamp() { | |
| 567 if (fStart > -1) | |
| 568 return super.getUndoModificationStamp(); | |
| 569 else if (fChanges.size() > 0) | |
| 134 | 570 return (cast(UndoableTextChange) fChanges.get(0)) |
| 129 | 571 .getUndoModificationStamp(); |
| 572 | |
| 573 return fUndoModificationStamp; | |
| 574 } | |
| 575 | |
| 576 /* | |
| 577 * @see dwtx.text.undo.UndoableTextChange#getRedoModificationStamp() | |
| 578 */ | |
| 579 protected long getRedoModificationStamp() { | |
| 580 if (fStart > -1) | |
| 581 return super.getRedoModificationStamp(); | |
| 582 else if (fChanges.size() > 0) | |
| 134 | 583 return (cast(UndoableTextChange) fChanges.get(fChanges.size() - 1)) |
| 129 | 584 .getRedoModificationStamp(); |
| 585 | |
| 586 return fRedoModificationStamp; | |
| 587 } | |
| 588 } | |
| 130 | 589 |
| 129 | 590 |
| 591 /** | |
| 592 * Internal listener to document changes. | |
| 593 */ | |
| 594 private class DocumentListener : IDocumentListener { | |
| 595 | |
| 596 private String fReplacedText; | |
| 597 | |
| 598 /* | |
| 599 * @see dwtx.jface.text.IDocumentListener#documentAboutToBeChanged(dwtx.jface.text.DocumentEvent) | |
| 600 */ | |
| 601 public void documentAboutToBeChanged(DocumentEvent event) { | |
| 602 try { | |
| 603 fReplacedText= event.getDocument().get(event.getOffset(), | |
| 604 event.getLength()); | |
| 605 fPreservedUndoModificationStamp= event.getModificationStamp(); | |
| 606 } catch (BadLocationException x) { | |
| 607 fReplacedText= null; | |
| 608 } | |
| 609 } | |
| 610 | |
| 611 /* | |
| 612 * @see dwtx.jface.text.IDocumentListener#documentChanged(dwtx.jface.text.DocumentEvent) | |
| 613 */ | |
| 614 public void documentChanged(DocumentEvent event) { | |
| 615 fPreservedRedoModificationStamp= event.getModificationStamp(); | |
| 616 | |
| 617 // record the current valid state for the top operation in case it | |
| 618 // remains the | |
| 619 // top operation but changes state. | |
| 620 IUndoableOperation op= fHistory.getUndoOperation(fUndoContext); | |
| 621 bool wasValid= false; | |
| 622 if (op !is null) | |
| 623 wasValid= op.canUndo(); | |
| 624 // Process the change, providing the before and after timestamps | |
| 625 processChange(event.getOffset(), event.getOffset() | |
| 626 + event.getLength(), event.getText(), fReplacedText, | |
| 627 fPreservedUndoModificationStamp, | |
| 628 fPreservedRedoModificationStamp); | |
| 629 | |
| 630 // now update fCurrent with the latest buffers from the document | |
| 631 // change. | |
| 632 fCurrent.pretendCommit(); | |
| 633 | |
| 634 if (op is fCurrent) { | |
| 635 // if the document change did not cause a new fCurrent to be | |
| 636 // created, then we should | |
| 637 // notify the history that the current operation changed if its | |
| 638 // validity has changed. | |
| 639 if (wasValid !is fCurrent.isValid()) | |
| 640 fHistory.operationChanged(op); | |
| 641 } else { | |
| 642 // if the change created a new fCurrent that we did not yet add | |
| 643 // to the | |
| 644 // stack, do so if it's valid and we are not in the middle of a | |
| 645 // compound change. | |
| 646 if (fCurrent !is fLastAddedTextEdit && fCurrent.isValid()) { | |
| 647 addToOperationHistory(fCurrent); | |
| 648 } | |
| 649 } | |
| 650 } | |
| 651 } | |
| 652 | |
| 653 /* | |
| 654 * @see IOperationHistoryListener | |
| 655 */ | |
| 656 private class HistoryListener : IOperationHistoryListener { | |
| 130 | 657 |
| 129 | 658 private IUndoableOperation fOperation; |
| 659 | |
| 159 | 660 public void historyNotification(OperationHistoryEvent event) { |
| 129 | 661 final int type= event.getEventType(); |
| 662 switch (type) { | |
| 663 case OperationHistoryEvent.ABOUT_TO_UNDO: | |
| 664 case OperationHistoryEvent.ABOUT_TO_REDO: | |
| 665 // if this is one of our operations | |
| 666 if (event.getOperation().hasContext(fUndoContext)) { | |
| 667 // if we are undoing/redoing an operation we generated, then | |
| 668 // ignore | |
| 669 // the document changes associated with this undo or redo. | |
|
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670 if (cast(UndoableTextChange)event.getOperation() ) { |
| 129 | 671 listenToTextChanges(false); |
| 672 | |
| 673 // in the undo case only, make sure compounds are closed | |
| 674 if (type is OperationHistoryEvent.ABOUT_TO_UNDO) { | |
| 675 if (fFoldingIntoCompoundChange) { | |
| 676 endCompoundChange(); | |
| 677 } | |
| 678 } | |
| 679 } else { | |
| 680 // the undo or redo has our context, but it is not one | |
| 681 // of our edits. We will listen to the changes, but will | |
| 682 // reset the state that tracks the undo/redo history. | |
| 683 commit(); | |
| 684 fLastAddedTextEdit= null; | |
| 685 } | |
| 686 fOperation= event.getOperation(); | |
| 687 } | |
| 688 break; | |
| 689 case OperationHistoryEvent.UNDONE: | |
| 690 case OperationHistoryEvent.REDONE: | |
| 691 case OperationHistoryEvent.OPERATION_NOT_OK: | |
| 692 if (event.getOperation() is fOperation) { | |
| 693 listenToTextChanges(true); | |
| 694 fOperation= null; | |
| 695 } | |
| 696 break; | |
| 697 } | |
| 698 } | |
| 699 | |
| 700 } | |
| 701 | |
| 702 | |
| 703 /** | |
| 704 * The undo context for this document undo manager. | |
| 705 */ | |
| 706 private ObjectUndoContext fUndoContext; | |
| 707 | |
| 708 /** | |
| 709 * The document whose changes are being tracked. | |
| 710 */ | |
| 711 private IDocument fDocument; | |
| 712 | |
| 713 /** | |
| 714 * The currently constructed edit. | |
| 715 */ | |
| 716 private UndoableTextChange fCurrent; | |
| 717 | |
| 718 /** | |
| 719 * The internal document listener. | |
| 720 */ | |
| 721 private DocumentListener fDocumentListener; | |
| 722 | |
| 723 /** | |
| 724 * Indicates whether the current change belongs to a compound change. | |
| 725 */ | |
| 726 private bool fFoldingIntoCompoundChange= false; | |
| 727 | |
| 728 /** | |
| 729 * The operation history being used to store the undo history. | |
| 730 */ | |
| 731 private IOperationHistory fHistory; | |
| 732 | |
| 733 /** | |
| 734 * The operation history listener used for managing undo and redo before and | |
| 735 * after the individual edits are performed. | |
| 736 */ | |
| 737 private IOperationHistoryListener fHistoryListener; | |
| 738 | |
| 739 /** | |
| 740 * The text edit last added to the operation history. This must be tracked | |
| 741 * internally instead of asking the history, since outside parties may be | |
| 742 * placing items on our undo/redo history. | |
| 743 */ | |
| 744 private UndoableTextChange fLastAddedTextEdit= null; | |
| 745 | |
| 746 /** | |
| 747 * The document modification stamp for redo. | |
| 748 */ | |
| 749 private long fPreservedRedoModificationStamp= IDocumentExtension4.UNKNOWN_MODIFICATION_STAMP; | |
| 750 | |
| 751 /** | |
| 752 * Text buffer to collect viewer content which has been replaced | |
| 753 */ | |
| 754 private StringBuffer fPreservedTextBuffer; | |
| 755 | |
| 756 /** | |
| 757 * The document modification stamp for undo. | |
| 758 */ | |
| 759 private long fPreservedUndoModificationStamp= IDocumentExtension4.UNKNOWN_MODIFICATION_STAMP; | |
| 760 | |
| 761 /** | |
| 762 * The last delete text edit. | |
| 763 */ | |
| 764 private UndoableTextChange fPreviousDelete; | |
| 765 | |
| 766 /** | |
| 767 * Text buffer to collect text which is inserted into the viewer | |
| 768 */ | |
| 769 private StringBuffer fTextBuffer; | |
| 770 | |
| 771 /** Indicates inserting state. */ | |
| 772 private bool fInserting= false; | |
| 773 | |
| 774 /** Indicates overwriting state. */ | |
| 775 private bool fOverwriting= false; | |
| 776 | |
| 777 /** The registered document listeners. */ | |
| 778 private ListenerList fDocumentUndoListeners; | |
| 779 | |
| 780 /** The list of clients connected. */ | |
| 781 private List fConnected; | |
| 782 | |
| 783 /** | |
| 130 | 784 * |
| 129 | 785 * Create a DocumentUndoManager for the given document. |
| 130 | 786 * |
| 129 | 787 * @param document the document whose undo history is being managed. |
| 788 */ | |
| 130 | 789 public this(IDocument document) { |
| 161 | 790 // super(); |
| 791 Assert.isNotNull(cast(Object)document); | |
| 129 | 792 fDocument= document; |
| 793 fHistory= OperationHistoryFactory.getOperationHistory(); | |
| 161 | 794 fUndoContext= new ObjectUndoContext(cast(Object)fDocument); |
| 129 | 795 fConnected= new ArrayList(); |
| 796 fDocumentUndoListeners= new ListenerList(ListenerList.IDENTITY); | |
| 797 } | |
| 798 | |
| 799 /* | |
| 800 * @see dwtx.jface.text.IDocumentUndoManager#addDocumentUndoListener(dwtx.jface.text.IDocumentUndoListener) | |
| 801 */ | |
| 802 public void addDocumentUndoListener(IDocumentUndoListener listener) { | |
| 161 | 803 fDocumentUndoListeners.add(cast(Object)listener); |
| 129 | 804 } |
| 805 | |
| 806 /* | |
| 807 * @see dwtx.jface.text.IDocumentUndoManager#removeDocumentUndoListener(dwtx.jface.text.IDocumentUndoListener) | |
| 808 */ | |
| 809 public void removeDocumentUndoListener(IDocumentUndoListener listener) { | |
| 161 | 810 fDocumentUndoListeners.remove(cast(Object)listener); |
| 129 | 811 } |
| 812 | |
| 813 /* | |
| 814 * @see dwtx.jface.text.IDocumentUndoManager#getUndoContext() | |
| 815 */ | |
| 816 public IUndoContext getUndoContext() { | |
| 817 return fUndoContext; | |
| 818 } | |
| 819 | |
| 820 /* | |
| 821 * @see dwtx.jface.text.IDocumentUndoManager#commit() | |
| 822 */ | |
| 823 public void commit() { | |
| 824 // if fCurrent has never been placed on the history, do so now. | |
| 825 // this can happen when there are multiple programmatically commits in a | |
| 826 // single document change. | |
| 827 if (fLastAddedTextEdit !is fCurrent) { | |
| 828 fCurrent.pretendCommit(); | |
| 829 if (fCurrent.isValid()) | |
| 830 addToOperationHistory(fCurrent); | |
| 831 } | |
| 832 fCurrent.commit(); | |
| 833 } | |
| 130 | 834 |
| 129 | 835 /* |
| 836 * @see dwtx.text.undo.IDocumentUndoManager#reset() | |
| 837 */ | |
| 838 public void reset() { | |
| 839 if (isConnected()) { | |
| 840 shutdown(); | |
| 841 initialize(); | |
| 842 } | |
| 843 } | |
| 844 | |
| 845 /* | |
| 846 * @see dwtx.text.undo.IDocumentUndoManager#redoable() | |
| 847 */ | |
| 848 public bool redoable() { | |
| 849 return OperationHistoryFactory.getOperationHistory().canRedo(fUndoContext); | |
| 850 } | |
| 851 | |
| 852 /* | |
| 853 * @see dwtx.text.undo.IDocumentUndoManager#undoable() | |
| 854 */ | |
| 855 public bool undoable() { | |
| 856 return OperationHistoryFactory.getOperationHistory().canUndo(fUndoContext); | |
| 857 } | |
| 858 | |
| 859 /* | |
| 860 * @see dwtx.text.undo.IDocumentUndoManager#undo() | |
| 861 */ | |
|
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862 public void redo() { |
| 129 | 863 if (isConnected() && redoable()) |
| 864 OperationHistoryFactory.getOperationHistory().redo(getUndoContext(), null, null); | |
| 865 } | |
| 866 | |
| 867 /* | |
| 868 * @see dwtx.text.undo.IDocumentUndoManager#undo() | |
| 869 */ | |
|
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870 public void undo() { |
| 129 | 871 if (undoable()) |
| 872 OperationHistoryFactory.getOperationHistory().undo(fUndoContext, null, null); | |
| 873 } | |
| 874 | |
| 875 /* | |
| 876 * @see dwtx.jface.text.IDocumentUndoManager#connect(java.lang.Object) | |
| 877 */ | |
| 878 public void connect(Object client) { | |
| 879 if (!isConnected()) { | |
| 880 initialize(); | |
| 881 } | |
| 882 if (!fConnected.contains(client)) | |
| 883 fConnected.add(client); | |
| 884 } | |
| 885 | |
| 886 /* | |
| 887 * @see dwtx.jface.text.IDocumentUndoManager#disconnect(java.lang.Object) | |
| 888 */ | |
| 889 public void disconnect(Object client) { | |
| 890 fConnected.remove(client); | |
| 891 if (!isConnected()) { | |
| 892 shutdown(); | |
| 893 } | |
| 894 } | |
| 895 | |
| 896 /* | |
| 897 * @see dwtx.jface.text.IDocumentUndoManager#beginCompoundChange() | |
| 898 */ | |
| 899 public void beginCompoundChange() { | |
| 900 if (isConnected()) { | |
| 901 fFoldingIntoCompoundChange= true; | |
| 902 commit(); | |
| 903 } | |
| 904 } | |
| 905 | |
| 906 /* | |
| 907 * @see dwtx.jface.text.IDocumentUndoManager#endCompoundChange() | |
| 908 */ | |
| 909 public void endCompoundChange() { | |
| 910 if (isConnected()) { | |
| 911 fFoldingIntoCompoundChange= false; | |
| 912 commit(); | |
| 913 } | |
| 914 } | |
| 915 | |
| 916 /* | |
| 917 * @see dwtx.jface.text.IDocumentUndoManager#setUndoLimit(int) | |
| 918 */ | |
| 919 public void setMaximalUndoLevel(int undoLimit) { | |
| 920 fHistory.setLimit(fUndoContext, undoLimit); | |
| 921 } | |
| 922 | |
| 923 /** | |
| 924 * Fires a document undo event to all registered document undo listeners. | |
| 925 * Uses a robust iterator. | |
| 130 | 926 * |
| 129 | 927 * @param offset the document offset |
| 928 * @param text the text that was inserted | |
| 929 * @param preservedText the text being replaced | |
| 930 * @param source the source which triggered the event | |
| 931 * @param eventType the type of event causing the change | |
| 932 * @param isCompound a flag indicating whether the change is a compound change | |
| 933 * @see IDocumentUndoListener | |
| 934 */ | |
| 935 void fireDocumentUndo(int offset, String text, String preservedText, Object source, int eventType, bool isCompound) { | |
| 936 eventType= isCompound ? eventType | DocumentUndoEvent.COMPOUND : eventType; | |
| 937 DocumentUndoEvent event= new DocumentUndoEvent(fDocument, offset, text, preservedText, eventType, source); | |
| 938 Object[] listeners= fDocumentUndoListeners.getListeners(); | |
| 939 for (int i= 0; i < listeners.length; i++) { | |
| 134 | 940 (cast(IDocumentUndoListener)listeners[i]).documentUndoNotification(event); |
| 129 | 941 } |
| 942 } | |
| 943 | |
| 944 /** | |
| 945 * Adds any listeners needed to track the document and the operations | |
| 946 * history. | |
| 947 */ | |
| 948 private void addListeners() { | |
| 949 fHistoryListener= new HistoryListener(); | |
| 950 fHistory.addOperationHistoryListener(fHistoryListener); | |
| 951 listenToTextChanges(true); | |
| 952 } | |
| 953 | |
| 954 /** | |
| 955 * Removes any listeners that were installed by the document. | |
| 956 */ | |
| 957 private void removeListeners() { | |
| 958 listenToTextChanges(false); | |
| 959 fHistory.removeOperationHistoryListener(fHistoryListener); | |
| 960 fHistoryListener= null; | |
| 961 } | |
| 962 | |
| 963 /** | |
| 964 * Adds the given text edit to the operation history if it is not part of a | |
| 965 * compound change. | |
| 130 | 966 * |
| 129 | 967 * @param edit |
| 968 * the edit to be added | |
| 969 */ | |
| 970 private void addToOperationHistory(UndoableTextChange edit) { | |
| 971 if (!fFoldingIntoCompoundChange | |
|
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972 || cast(UndoableCompoundTextChange)edit ) { |
| 129 | 973 fHistory.add(edit); |
| 974 fLastAddedTextEdit= edit; | |
| 975 } | |
| 976 } | |
| 977 | |
| 978 /** | |
| 979 * Disposes the undo history. | |
| 980 */ | |
| 981 private void disposeUndoHistory() { | |
| 982 fHistory.dispose(fUndoContext, true, true, true); | |
| 983 } | |
| 984 | |
| 985 /** | |
| 986 * Initializes the undo history. | |
| 987 */ | |
| 988 private void initializeUndoHistory() { | |
| 989 if (fHistory !is null && fUndoContext !is null) | |
| 990 fHistory.dispose(fUndoContext, true, true, false); | |
| 991 | |
| 992 } | |
| 993 | |
| 994 /** | |
| 995 * Checks whether the given text starts with a line delimiter and | |
| 996 * subsequently contains a white space only. | |
| 130 | 997 * |
| 129 | 998 * @param text the text to check |
| 999 * @return <code>true</code> if the text is a line delimiter followed by | |
| 1000 * whitespace, <code>false</code> otherwise | |
| 1001 */ | |
| 1002 private bool isWhitespaceText(String text) { | |
| 1003 | |
| 1004 if (text is null || text.length() is 0) | |
| 1005 return false; | |
| 1006 | |
| 1007 String[] delimiters= fDocument.getLegalLineDelimiters(); | |
| 1008 int index= TextUtilities.startsWith(delimiters, text); | |
| 1009 if (index > -1) { | |
| 1010 char c; | |
| 1011 int length= text.length(); | |
| 161 | 1012 for (int i= delimiters[index].length; i < length; i++) { |
| 129 | 1013 c= text.charAt(i); |
| 1014 if (c !is ' ' && c !is '\t') | |
| 1015 return false; | |
| 1016 } | |
| 1017 return true; | |
| 1018 } | |
| 1019 | |
| 1020 return false; | |
| 1021 } | |
| 1022 | |
| 1023 /** | |
| 1024 * Switches the state of whether there is a text listener or not. | |
| 130 | 1025 * |
| 129 | 1026 * @param listen the state which should be established |
| 1027 */ | |
| 1028 private void listenToTextChanges(bool listen) { | |
| 1029 if (listen) { | |
| 1030 if (fDocumentListener is null && fDocument !is null) { | |
| 1031 fDocumentListener= new DocumentListener(); | |
| 1032 fDocument.addDocumentListener(fDocumentListener); | |
| 1033 } | |
| 1034 } else if (!listen) { | |
| 1035 if (fDocumentListener !is null && fDocument !is null) { | |
| 1036 fDocument.removeDocumentListener(fDocumentListener); | |
| 1037 fDocumentListener= null; | |
| 1038 } | |
| 1039 } | |
| 1040 } | |
| 1041 | |
| 1042 private void processChange(int modelStart, int modelEnd, | |
| 1043 String insertedText, String replacedText, | |
| 1044 long beforeChangeModificationStamp, | |
| 1045 long afterChangeModificationStamp) { | |
| 1046 | |
| 1047 if (insertedText is null) | |
| 1048 insertedText= ""; //$NON-NLS-1$ | |
| 1049 | |
| 1050 if (replacedText is null) | |
| 1051 replacedText= ""; //$NON-NLS-1$ | |
| 1052 | |
| 1053 int length= insertedText.length(); | |
| 1054 int diff= modelEnd - modelStart; | |
| 1055 | |
| 1056 if (fCurrent.fUndoModificationStamp is IDocumentExtension4.UNKNOWN_MODIFICATION_STAMP) | |
| 1057 fCurrent.fUndoModificationStamp= beforeChangeModificationStamp; | |
| 1058 | |
| 1059 // normalize | |
| 1060 if (diff < 0) { | |
| 1061 int tmp= modelEnd; | |
| 1062 modelEnd= modelStart; | |
| 1063 modelStart= tmp; | |
| 1064 } | |
| 1065 | |
| 1066 if (modelStart is modelEnd) { | |
| 1067 // text will be inserted | |
| 1068 if ((length is 1) || isWhitespaceText(insertedText)) { | |
| 1069 // by typing or whitespace | |
| 1070 if (!fInserting | |
| 1071 || (modelStart !is fCurrent.fStart | |
| 1072 + fTextBuffer.length())) { | |
| 1073 fCurrent.fRedoModificationStamp= beforeChangeModificationStamp; | |
| 1074 if (fCurrent.attemptCommit()) | |
| 1075 fCurrent.fUndoModificationStamp= beforeChangeModificationStamp; | |
| 1076 | |
| 1077 fInserting= true; | |
| 1078 } | |
| 1079 if (fCurrent.fStart < 0) | |
| 1080 fCurrent.fStart= fCurrent.fEnd= modelStart; | |
| 1081 if (length > 0) | |
| 1082 fTextBuffer.append(insertedText); | |
| 1083 } else if (length > 0) { | |
| 1084 // by pasting or model manipulation | |
| 1085 fCurrent.fRedoModificationStamp= beforeChangeModificationStamp; | |
| 1086 if (fCurrent.attemptCommit()) | |
| 1087 fCurrent.fUndoModificationStamp= beforeChangeModificationStamp; | |
| 1088 | |
| 1089 fCurrent.fStart= fCurrent.fEnd= modelStart; | |
| 1090 fTextBuffer.append(insertedText); | |
| 1091 fCurrent.fRedoModificationStamp= afterChangeModificationStamp; | |
| 1092 if (fCurrent.attemptCommit()) | |
| 1093 fCurrent.fUndoModificationStamp= afterChangeModificationStamp; | |
| 1094 | |
| 1095 } | |
| 1096 } else { | |
| 1097 if (length is 0) { | |
| 1098 // text will be deleted by backspace or DEL key or empty | |
| 1099 // clipboard | |
| 161 | 1100 length= replacedText.length; |
| 129 | 1101 String[] delimiters= fDocument.getLegalLineDelimiters(); |
| 1102 | |
| 1103 if ((length is 1) | |
| 1104 || TextUtilities.equals(delimiters, replacedText) > -1) { | |
| 1105 | |
| 1106 // whereby selection is empty | |
| 1107 | |
| 1108 if (fPreviousDelete.fStart is modelStart | |
| 1109 && fPreviousDelete.fEnd is modelEnd) { | |
| 1110 // repeated DEL | |
| 1111 | |
| 1112 // correct wrong settings of fCurrent | |
| 1113 if (fCurrent.fStart is modelEnd | |
| 1114 && fCurrent.fEnd is modelStart) { | |
| 1115 fCurrent.fStart= modelStart; | |
| 1116 fCurrent.fEnd= modelEnd; | |
| 1117 } | |
| 1118 // append to buffer && extend edit range | |
| 1119 fPreservedTextBuffer.append(replacedText); | |
| 1120 ++fCurrent.fEnd; | |
| 1121 | |
| 1122 } else if (fPreviousDelete.fStart is modelEnd) { | |
| 1123 // repeated backspace | |
| 1124 | |
| 1125 // insert in buffer and extend edit range | |
| 161 | 1126 fPreservedTextBuffer.select(0,0); |
| 1127 fPreservedTextBuffer.replace(replacedText); | |
| 129 | 1128 fCurrent.fStart= modelStart; |
| 1129 | |
| 1130 } else { | |
| 1131 // either DEL or backspace for the first time | |
| 1132 | |
| 1133 fCurrent.fRedoModificationStamp= beforeChangeModificationStamp; | |
| 1134 if (fCurrent.attemptCommit()) | |
| 1135 fCurrent.fUndoModificationStamp= beforeChangeModificationStamp; | |
| 1136 | |
| 1137 // as we can not decide whether it was DEL or backspace | |
| 1138 // we initialize for backspace | |
| 1139 fPreservedTextBuffer.append(replacedText); | |
| 1140 fCurrent.fStart= modelStart; | |
| 1141 fCurrent.fEnd= modelEnd; | |
| 1142 } | |
| 1143 | |
| 1144 fPreviousDelete.set(modelStart, modelEnd); | |
| 1145 | |
| 1146 } else if (length > 0) { | |
| 1147 // whereby selection is not empty | |
| 1148 fCurrent.fRedoModificationStamp= beforeChangeModificationStamp; | |
| 1149 if (fCurrent.attemptCommit()) | |
| 1150 fCurrent.fUndoModificationStamp= beforeChangeModificationStamp; | |
| 1151 | |
| 1152 fCurrent.fStart= modelStart; | |
| 1153 fCurrent.fEnd= modelEnd; | |
| 1154 fPreservedTextBuffer.append(replacedText); | |
| 1155 } | |
| 1156 } else { | |
| 1157 // text will be replaced | |
| 1158 | |
| 1159 if (length is 1) { | |
| 161 | 1160 length= replacedText.length; |
| 129 | 1161 String[] delimiters= fDocument.getLegalLineDelimiters(); |
| 1162 | |
| 1163 if ((length is 1) | |
| 1164 || TextUtilities.equals(delimiters, replacedText) > -1) { | |
| 1165 // because of overwrite mode or model manipulation | |
| 1166 if (!fOverwriting | |
| 1167 || (modelStart !is fCurrent.fStart | |
| 1168 + fTextBuffer.length())) { | |
| 1169 fCurrent.fRedoModificationStamp= beforeChangeModificationStamp; | |
| 1170 if (fCurrent.attemptCommit()) | |
| 1171 fCurrent.fUndoModificationStamp= beforeChangeModificationStamp; | |
| 1172 | |
| 1173 fOverwriting= true; | |
| 1174 } | |
| 1175 | |
| 1176 if (fCurrent.fStart < 0) | |
| 1177 fCurrent.fStart= modelStart; | |
| 1178 | |
| 1179 fCurrent.fEnd= modelEnd; | |
| 1180 fTextBuffer.append(insertedText); | |
| 1181 fPreservedTextBuffer.append(replacedText); | |
| 1182 fCurrent.fRedoModificationStamp= afterChangeModificationStamp; | |
| 1183 return; | |
| 1184 } | |
| 1185 } | |
| 1186 // because of typing or pasting whereby selection is not empty | |
| 1187 fCurrent.fRedoModificationStamp= beforeChangeModificationStamp; | |
| 1188 if (fCurrent.attemptCommit()) | |
| 1189 fCurrent.fUndoModificationStamp= beforeChangeModificationStamp; | |
| 1190 | |
| 1191 fCurrent.fStart= modelStart; | |
| 1192 fCurrent.fEnd= modelEnd; | |
| 1193 fTextBuffer.append(insertedText); | |
| 1194 fPreservedTextBuffer.append(replacedText); | |
| 1195 } | |
| 1196 } | |
| 1197 // in all cases, the redo modification stamp is updated on the open | |
| 1198 // text edit | |
| 1199 fCurrent.fRedoModificationStamp= afterChangeModificationStamp; | |
| 1200 } | |
| 1201 | |
| 1202 /** | |
| 1203 * Initialize the receiver. | |
| 1204 */ | |
| 1205 private void initialize() { | |
| 1206 initializeUndoHistory(); | |
| 1207 | |
| 1208 // open up the current text edit | |
| 1209 fCurrent= new UndoableTextChange(this); | |
| 1210 fPreviousDelete= new UndoableTextChange(this); | |
| 1211 fTextBuffer= new StringBuffer(); | |
| 1212 fPreservedTextBuffer= new StringBuffer(); | |
| 1213 | |
| 1214 addListeners(); | |
| 1215 } | |
| 130 | 1216 |
| 129 | 1217 /** |
| 1218 * Reset processChange state. | |
| 130 | 1219 * |
| 129 | 1220 * @since 3.2 |
| 1221 */ | |
| 1222 private void resetProcessChangeState() { | |
| 1223 fInserting= false; | |
| 1224 fOverwriting= false; | |
| 1225 fPreviousDelete.reinitialize(); | |
| 1226 } | |
| 1227 | |
| 1228 /** | |
| 1229 * Shutdown the receiver. | |
| 1230 */ | |
| 1231 private void shutdown() { | |
| 1232 removeListeners(); | |
| 1233 | |
| 1234 fCurrent= null; | |
| 1235 fPreviousDelete= null; | |
| 161 | 1236 fTextBuffer.clear(); |
| 1237 fPreservedTextBuffer.clear(); | |
| 129 | 1238 |
| 1239 disposeUndoHistory(); | |
| 1240 } | |
| 1241 | |
| 1242 /** | |
| 1243 * Return whether or not any clients are connected to the receiver. | |
| 130 | 1244 * |
| 129 | 1245 * @return <code>true</code> if the receiver is connected to |
| 1246 * clients, <code>false</code> if it is not | |
| 1247 */ | |
| 1248 bool isConnected() { | |
| 1249 if (fConnected is null) | |
| 1250 return false; | |
| 1251 return !fConnected.isEmpty(); | |
| 1252 } | |
| 1253 | |
| 1254 /* | |
| 1255 * @see dwtx.jface.text.IDocumentUndoManager#transferUndoHistory(IDocumentUndoManager) | |
| 1256 */ | |
| 1257 public void transferUndoHistory(IDocumentUndoManager manager) { | |
| 1258 IUndoContext oldUndoContext= manager.getUndoContext(); | |
| 1259 // Get the history for the old undo context. | |
| 1260 IUndoableOperation [] operations= OperationHistoryFactory.getOperationHistory().getUndoHistory(oldUndoContext); | |
| 1261 for (int i= 0; i < operations.length; i++) { | |
| 1262 // First replace the undo context | |
| 1263 IUndoableOperation op= operations[i]; | |
|
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1264 if (cast(IContextReplacingOperation)op ) { |
| 134 | 1265 (cast(IContextReplacingOperation)op).replaceContext(oldUndoContext, getUndoContext()); |
| 129 | 1266 } else { |
| 1267 op.addContext(getUndoContext()); | |
| 1268 op.removeContext(oldUndoContext); | |
| 1269 } | |
| 1270 // Now update the manager that owns the text edit. | |
|
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1271 if (cast(UndoableTextChange)op ) { |
| 134 | 1272 (cast(UndoableTextChange)op).fDocumentUndoManager= this; |
| 129 | 1273 } |
| 1274 } | |
| 130 | 1275 |
| 129 | 1276 IUndoableOperation op= OperationHistoryFactory.getOperationHistory().getUndoOperation(getUndoContext()); |
|
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1277 if (op !is null && !(cast(UndoableTextChange)op )) |
| 129 | 1278 return; |
| 130 | 1279 |
| 129 | 1280 // Record the transfer itself as an undoable change. |
| 1281 // If the transfer results from some open operation, recording this change will | |
| 1282 // cause our undo context to be added to the outer operation. If there is no | |
| 1283 // outer operation, there will be a local change to signify the transfer. | |
| 1284 // This also serves to synchronize the modification stamps with the documents. | |
| 1285 UndoableTextChange cmd= new UndoableTextChange(this); | |
| 1286 cmd.fStart= cmd.fEnd= 0; | |
| 1287 cmd.fText= cmd.fPreservedText= ""; //$NON-NLS-1$ | |
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1288 if (cast(IDocumentExtension4)fDocument ) { |
| 134 | 1289 cmd.fRedoModificationStamp= (cast(IDocumentExtension4)fDocument).getModificationStamp(); |
| 129 | 1290 if (op !is null) |
| 134 | 1291 cmd.fUndoModificationStamp= (cast(UndoableTextChange)op).fRedoModificationStamp; |
| 129 | 1292 } |
| 1293 addToOperationHistory(cmd); | |
| 1294 } | |
| 1295 | |
| 130 | 1296 |
| 129 | 1297 } |