Mercurial > projects > dwt-addons
annotate dwtx/text/undo/DocumentUndoManager.d @ 153:f70d9508c95c
Fix java Collection imports
| author | Frank Benoit <benoit@tionex.de> |
|---|---|
| date | Mon, 25 Aug 2008 00:27:31 +0200 |
| parents | 6dcb0baaa031 |
| children | 7926b636c282 |
| 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()) { | |
| 272 fDocumentUndoManager.fireDocumentUndo(fStart, fPreservedText, fText, uiInfo, DocumentUndoEvent.ABOUT_TO_UNDO, false); | |
| 273 undoTextChange(); | |
| 274 fDocumentUndoManager.resetProcessChangeState(); | |
| 275 fDocumentUndoManager.fireDocumentUndo(fStart, fPreservedText, fText, uiInfo, DocumentUndoEvent.UNDONE, false); | |
| 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()) { | |
| 304 fDocumentUndoManager.fireDocumentUndo(fStart, fText, fPreservedText, uiInfo, DocumentUndoEvent.ABOUT_TO_REDO, false); | |
| 305 redoTextChange(); | |
| 306 fDocumentUndoManager.resetProcessChangeState(); | |
| 307 fDocumentUndoManager.fireDocumentUndo(fStart, fText, fPreservedText, uiInfo, DocumentUndoEvent.REDONE, false); | |
| 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(); | |
| 319 fDocumentUndoManager.fTextBuffer.setLength(0); | |
| 320 fPreservedText= fDocumentUndoManager.fPreservedTextBuffer.toString(); | |
| 321 fDocumentUndoManager.fPreservedTextBuffer.setLength(0); | |
| 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 */ | |
| 392 public String toString() { | |
| 393 String delimiter= ", "; //$NON-NLS-1$ | |
| 394 StringBuffer text= new StringBuffer(super.toString()); | |
| 395 text.append("\n"); //$NON-NLS-1$ | |
| 396 text.append(this.getClass().getName()); | |
| 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 */ | |
| 444 private List fChanges= new ArrayList(); | |
| 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) { |
| 129 | 453 super(manager); |
| 454 } | |
| 455 | |
| 456 /** | |
| 457 * Adds a new individual change to this compound change. | |
| 130 | 458 * |
| 129 | 459 * @param change the change to be added |
| 460 */ | |
| 461 protected void add(UndoableTextChange change) { | |
| 462 fChanges.add(change); | |
| 463 } | |
| 464 | |
| 465 /* | |
| 466 * @see dwtx.text.undo.UndoableTextChange#undo(dwtx.core.runtime.IProgressMonitor, dwtx.core.runtime.IAdaptable) | |
| 467 */ | |
| 468 public IStatus undo(IProgressMonitor monitor, IAdaptable uiInfo) { | |
| 469 | |
| 470 int size= fChanges.size(); | |
| 471 if (size > 0) { | |
| 472 UndoableTextChange c; | |
| 473 | |
| 134 | 474 c= cast(UndoableTextChange) fChanges.get(0); |
| 129 | 475 fDocumentUndoManager.fireDocumentUndo(c.fStart, c.fPreservedText, c.fText, uiInfo, DocumentUndoEvent.ABOUT_TO_UNDO, true); |
| 476 | |
| 477 for (int i= size - 1; i >= 0; --i) { | |
| 134 | 478 c= cast(UndoableTextChange) fChanges.get(i); |
| 129 | 479 c.undoTextChange(); |
| 480 } | |
| 481 fDocumentUndoManager.resetProcessChangeState(); | |
| 482 fDocumentUndoManager.fireDocumentUndo(c.fStart, c.fPreservedText, c.fText, uiInfo, | |
| 483 DocumentUndoEvent.UNDONE, true); | |
| 484 } | |
| 485 return Status.OK_STATUS; | |
| 486 } | |
| 487 | |
| 488 /* | |
| 489 * @see dwtx.text.undo.UndoableTextChange#redo(dwtx.core.runtime.IProgressMonitor, dwtx.core.runtime.IAdaptable) | |
| 490 */ | |
| 491 public IStatus redo(IProgressMonitor monitor, IAdaptable uiInfo) { | |
| 492 | |
| 493 int size= fChanges.size(); | |
| 494 if (size > 0) { | |
| 495 | |
| 496 UndoableTextChange c; | |
| 134 | 497 c= cast(UndoableTextChange) fChanges.get(size - 1); |
| 129 | 498 fDocumentUndoManager.fireDocumentUndo(c.fStart, c.fText, c.fPreservedText, uiInfo, DocumentUndoEvent.ABOUT_TO_REDO, true); |
| 499 | |
| 500 for (int i= 0; i <= size - 1; ++i) { | |
| 134 | 501 c= cast(UndoableTextChange) fChanges.get(i); |
| 129 | 502 c.redoTextChange(); |
| 503 } | |
| 504 fDocumentUndoManager.resetProcessChangeState(); | |
| 505 fDocumentUndoManager.fireDocumentUndo(c.fStart, c.fText, c.fPreservedText, uiInfo, DocumentUndoEvent.REDONE, true); | |
| 506 } | |
| 507 | |
| 508 return Status.OK_STATUS; | |
| 509 } | |
| 510 | |
| 511 /* | |
| 512 * @see dwtx.text.undo.UndoableTextChange#updateTextChange() | |
| 513 */ | |
| 514 protected void updateTextChange() { | |
| 515 // first gather the data from the buffers | |
| 516 super.updateTextChange(); | |
| 517 | |
| 518 // the result of the update is stored as a child change | |
| 519 UndoableTextChange c= new UndoableTextChange(fDocumentUndoManager); | |
| 520 c.fStart= fStart; | |
| 521 c.fEnd= fEnd; | |
| 522 c.fText= fText; | |
| 523 c.fPreservedText= fPreservedText; | |
| 524 c.fUndoModificationStamp= fUndoModificationStamp; | |
| 525 c.fRedoModificationStamp= fRedoModificationStamp; | |
| 526 add(c); | |
| 527 | |
| 528 // clear out all indexes now that the child is added | |
| 529 reinitialize(); | |
| 530 } | |
| 531 | |
| 532 /* | |
| 533 * @see dwtx.text.undo.UndoableTextChange#createCurrent() | |
| 534 */ | |
| 535 protected UndoableTextChange createCurrent() { | |
| 536 | |
| 537 if (!fDocumentUndoManager.fFoldingIntoCompoundChange) | |
| 538 return new UndoableTextChange(fDocumentUndoManager); | |
| 539 | |
| 540 reinitialize(); | |
| 541 return this; | |
| 542 } | |
| 543 | |
| 544 /* | |
| 545 * @see dwtx.text.undo.UndoableTextChange#commit() | |
| 546 */ | |
| 547 protected void commit() { | |
| 548 // if there is pending data, update the text change | |
| 549 if (fStart > -1) | |
| 550 updateTextChange(); | |
| 551 fDocumentUndoManager.fCurrent= createCurrent(); | |
| 552 fDocumentUndoManager.resetProcessChangeState(); | |
| 553 } | |
| 130 | 554 |
| 129 | 555 /* |
| 556 * @see dwtx.text.undo.UndoableTextChange#isValid() | |
| 557 */ | |
| 558 protected bool isValid() { | |
| 559 return fStart > -1 || fChanges.size() > 0; | |
| 560 } | |
| 561 | |
| 562 /* | |
| 563 * @see dwtx.text.undo.UndoableTextChange#getUndoModificationStamp() | |
| 564 */ | |
| 565 protected long getUndoModificationStamp() { | |
| 566 if (fStart > -1) | |
| 567 return super.getUndoModificationStamp(); | |
| 568 else if (fChanges.size() > 0) | |
| 134 | 569 return (cast(UndoableTextChange) fChanges.get(0)) |
| 129 | 570 .getUndoModificationStamp(); |
| 571 | |
| 572 return fUndoModificationStamp; | |
| 573 } | |
| 574 | |
| 575 /* | |
| 576 * @see dwtx.text.undo.UndoableTextChange#getRedoModificationStamp() | |
| 577 */ | |
| 578 protected long getRedoModificationStamp() { | |
| 579 if (fStart > -1) | |
| 580 return super.getRedoModificationStamp(); | |
| 581 else if (fChanges.size() > 0) | |
| 134 | 582 return (cast(UndoableTextChange) fChanges.get(fChanges.size() - 1)) |
| 129 | 583 .getRedoModificationStamp(); |
| 584 | |
| 585 return fRedoModificationStamp; | |
| 586 } | |
| 587 } | |
| 130 | 588 |
| 129 | 589 |
| 590 /** | |
| 591 * Internal listener to document changes. | |
| 592 */ | |
| 593 private class DocumentListener : IDocumentListener { | |
| 594 | |
| 595 private String fReplacedText; | |
| 596 | |
| 597 /* | |
| 598 * @see dwtx.jface.text.IDocumentListener#documentAboutToBeChanged(dwtx.jface.text.DocumentEvent) | |
| 599 */ | |
| 600 public void documentAboutToBeChanged(DocumentEvent event) { | |
| 601 try { | |
| 602 fReplacedText= event.getDocument().get(event.getOffset(), | |
| 603 event.getLength()); | |
| 604 fPreservedUndoModificationStamp= event.getModificationStamp(); | |
| 605 } catch (BadLocationException x) { | |
| 606 fReplacedText= null; | |
| 607 } | |
| 608 } | |
| 609 | |
| 610 /* | |
| 611 * @see dwtx.jface.text.IDocumentListener#documentChanged(dwtx.jface.text.DocumentEvent) | |
| 612 */ | |
| 613 public void documentChanged(DocumentEvent event) { | |
| 614 fPreservedRedoModificationStamp= event.getModificationStamp(); | |
| 615 | |
| 616 // record the current valid state for the top operation in case it | |
| 617 // remains the | |
| 618 // top operation but changes state. | |
| 619 IUndoableOperation op= fHistory.getUndoOperation(fUndoContext); | |
| 620 bool wasValid= false; | |
| 621 if (op !is null) | |
| 622 wasValid= op.canUndo(); | |
| 623 // Process the change, providing the before and after timestamps | |
| 624 processChange(event.getOffset(), event.getOffset() | |
| 625 + event.getLength(), event.getText(), fReplacedText, | |
| 626 fPreservedUndoModificationStamp, | |
| 627 fPreservedRedoModificationStamp); | |
| 628 | |
| 629 // now update fCurrent with the latest buffers from the document | |
| 630 // change. | |
| 631 fCurrent.pretendCommit(); | |
| 632 | |
| 633 if (op is fCurrent) { | |
| 634 // if the document change did not cause a new fCurrent to be | |
| 635 // created, then we should | |
| 636 // notify the history that the current operation changed if its | |
| 637 // validity has changed. | |
| 638 if (wasValid !is fCurrent.isValid()) | |
| 639 fHistory.operationChanged(op); | |
| 640 } else { | |
| 641 // if the change created a new fCurrent that we did not yet add | |
| 642 // to the | |
| 643 // stack, do so if it's valid and we are not in the middle of a | |
| 644 // compound change. | |
| 645 if (fCurrent !is fLastAddedTextEdit && fCurrent.isValid()) { | |
| 646 addToOperationHistory(fCurrent); | |
| 647 } | |
| 648 } | |
| 649 } | |
| 650 } | |
| 651 | |
| 652 /* | |
| 653 * @see IOperationHistoryListener | |
| 654 */ | |
| 655 private class HistoryListener : IOperationHistoryListener { | |
| 130 | 656 |
| 129 | 657 private IUndoableOperation fOperation; |
| 658 | |
| 659 public void historyNotification(final OperationHistoryEvent event) { | |
| 660 final int type= event.getEventType(); | |
| 661 switch (type) { | |
| 662 case OperationHistoryEvent.ABOUT_TO_UNDO: | |
| 663 case OperationHistoryEvent.ABOUT_TO_REDO: | |
| 664 // if this is one of our operations | |
| 665 if (event.getOperation().hasContext(fUndoContext)) { | |
| 666 // if we are undoing/redoing an operation we generated, then | |
| 667 // ignore | |
| 668 // the document changes associated with this undo or redo. | |
|
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669 if (cast(UndoableTextChange)event.getOperation() ) { |
| 129 | 670 listenToTextChanges(false); |
| 671 | |
| 672 // in the undo case only, make sure compounds are closed | |
| 673 if (type is OperationHistoryEvent.ABOUT_TO_UNDO) { | |
| 674 if (fFoldingIntoCompoundChange) { | |
| 675 endCompoundChange(); | |
| 676 } | |
| 677 } | |
| 678 } else { | |
| 679 // the undo or redo has our context, but it is not one | |
| 680 // of our edits. We will listen to the changes, but will | |
| 681 // reset the state that tracks the undo/redo history. | |
| 682 commit(); | |
| 683 fLastAddedTextEdit= null; | |
| 684 } | |
| 685 fOperation= event.getOperation(); | |
| 686 } | |
| 687 break; | |
| 688 case OperationHistoryEvent.UNDONE: | |
| 689 case OperationHistoryEvent.REDONE: | |
| 690 case OperationHistoryEvent.OPERATION_NOT_OK: | |
| 691 if (event.getOperation() is fOperation) { | |
| 692 listenToTextChanges(true); | |
| 693 fOperation= null; | |
| 694 } | |
| 695 break; | |
| 696 } | |
| 697 } | |
| 698 | |
| 699 } | |
| 700 | |
| 701 | |
| 702 /** | |
| 703 * The undo context for this document undo manager. | |
| 704 */ | |
| 705 private ObjectUndoContext fUndoContext; | |
| 706 | |
| 707 /** | |
| 708 * The document whose changes are being tracked. | |
| 709 */ | |
| 710 private IDocument fDocument; | |
| 711 | |
| 712 /** | |
| 713 * The currently constructed edit. | |
| 714 */ | |
| 715 private UndoableTextChange fCurrent; | |
| 716 | |
| 717 /** | |
| 718 * The internal document listener. | |
| 719 */ | |
| 720 private DocumentListener fDocumentListener; | |
| 721 | |
| 722 /** | |
| 723 * Indicates whether the current change belongs to a compound change. | |
| 724 */ | |
| 725 private bool fFoldingIntoCompoundChange= false; | |
| 726 | |
| 727 /** | |
| 728 * The operation history being used to store the undo history. | |
| 729 */ | |
| 730 private IOperationHistory fHistory; | |
| 731 | |
| 732 /** | |
| 733 * The operation history listener used for managing undo and redo before and | |
| 734 * after the individual edits are performed. | |
| 735 */ | |
| 736 private IOperationHistoryListener fHistoryListener; | |
| 737 | |
| 738 /** | |
| 739 * The text edit last added to the operation history. This must be tracked | |
| 740 * internally instead of asking the history, since outside parties may be | |
| 741 * placing items on our undo/redo history. | |
| 742 */ | |
| 743 private UndoableTextChange fLastAddedTextEdit= null; | |
| 744 | |
| 745 /** | |
| 746 * The document modification stamp for redo. | |
| 747 */ | |
| 748 private long fPreservedRedoModificationStamp= IDocumentExtension4.UNKNOWN_MODIFICATION_STAMP; | |
| 749 | |
| 750 /** | |
| 751 * Text buffer to collect viewer content which has been replaced | |
| 752 */ | |
| 753 private StringBuffer fPreservedTextBuffer; | |
| 754 | |
| 755 /** | |
| 756 * The document modification stamp for undo. | |
| 757 */ | |
| 758 private long fPreservedUndoModificationStamp= IDocumentExtension4.UNKNOWN_MODIFICATION_STAMP; | |
| 759 | |
| 760 /** | |
| 761 * The last delete text edit. | |
| 762 */ | |
| 763 private UndoableTextChange fPreviousDelete; | |
| 764 | |
| 765 /** | |
| 766 * Text buffer to collect text which is inserted into the viewer | |
| 767 */ | |
| 768 private StringBuffer fTextBuffer; | |
| 769 | |
| 770 /** Indicates inserting state. */ | |
| 771 private bool fInserting= false; | |
| 772 | |
| 773 /** Indicates overwriting state. */ | |
| 774 private bool fOverwriting= false; | |
| 775 | |
| 776 /** The registered document listeners. */ | |
| 777 private ListenerList fDocumentUndoListeners; | |
| 778 | |
| 779 /** The list of clients connected. */ | |
| 780 private List fConnected; | |
| 781 | |
| 782 /** | |
| 130 | 783 * |
| 129 | 784 * Create a DocumentUndoManager for the given document. |
| 130 | 785 * |
| 129 | 786 * @param document the document whose undo history is being managed. |
| 787 */ | |
| 130 | 788 public this(IDocument document) { |
| 129 | 789 super(); |
| 790 Assert.isNotNull(document); | |
| 791 fDocument= document; | |
| 792 fHistory= OperationHistoryFactory.getOperationHistory(); | |
| 793 fUndoContext= new ObjectUndoContext(fDocument); | |
| 794 fConnected= new ArrayList(); | |
| 795 fDocumentUndoListeners= new ListenerList(ListenerList.IDENTITY); | |
| 796 } | |
| 797 | |
| 798 /* | |
| 799 * @see dwtx.jface.text.IDocumentUndoManager#addDocumentUndoListener(dwtx.jface.text.IDocumentUndoListener) | |
| 800 */ | |
| 801 public void addDocumentUndoListener(IDocumentUndoListener listener) { | |
| 802 fDocumentUndoListeners.add(listener); | |
| 803 } | |
| 804 | |
| 805 /* | |
| 806 * @see dwtx.jface.text.IDocumentUndoManager#removeDocumentUndoListener(dwtx.jface.text.IDocumentUndoListener) | |
| 807 */ | |
| 808 public void removeDocumentUndoListener(IDocumentUndoListener listener) { | |
| 809 fDocumentUndoListeners.remove(listener); | |
| 810 } | |
| 811 | |
| 812 /* | |
| 813 * @see dwtx.jface.text.IDocumentUndoManager#getUndoContext() | |
| 814 */ | |
| 815 public IUndoContext getUndoContext() { | |
| 816 return fUndoContext; | |
| 817 } | |
| 818 | |
| 819 /* | |
| 820 * @see dwtx.jface.text.IDocumentUndoManager#commit() | |
| 821 */ | |
| 822 public void commit() { | |
| 823 // if fCurrent has never been placed on the history, do so now. | |
| 824 // this can happen when there are multiple programmatically commits in a | |
| 825 // single document change. | |
| 826 if (fLastAddedTextEdit !is fCurrent) { | |
| 827 fCurrent.pretendCommit(); | |
| 828 if (fCurrent.isValid()) | |
| 829 addToOperationHistory(fCurrent); | |
| 830 } | |
| 831 fCurrent.commit(); | |
| 832 } | |
| 130 | 833 |
| 129 | 834 /* |
| 835 * @see dwtx.text.undo.IDocumentUndoManager#reset() | |
| 836 */ | |
| 837 public void reset() { | |
| 838 if (isConnected()) { | |
| 839 shutdown(); | |
| 840 initialize(); | |
| 841 } | |
| 842 } | |
| 843 | |
| 844 /* | |
| 845 * @see dwtx.text.undo.IDocumentUndoManager#redoable() | |
| 846 */ | |
| 847 public bool redoable() { | |
| 848 return OperationHistoryFactory.getOperationHistory().canRedo(fUndoContext); | |
| 849 } | |
| 850 | |
| 851 /* | |
| 852 * @see dwtx.text.undo.IDocumentUndoManager#undoable() | |
| 853 */ | |
| 854 public bool undoable() { | |
| 855 return OperationHistoryFactory.getOperationHistory().canUndo(fUndoContext); | |
| 856 } | |
| 857 | |
| 858 /* | |
| 859 * @see dwtx.text.undo.IDocumentUndoManager#undo() | |
| 860 */ | |
|
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861 public void redo() { |
| 129 | 862 if (isConnected() && redoable()) |
| 863 OperationHistoryFactory.getOperationHistory().redo(getUndoContext(), null, null); | |
| 864 } | |
| 865 | |
| 866 /* | |
| 867 * @see dwtx.text.undo.IDocumentUndoManager#undo() | |
| 868 */ | |
|
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869 public void undo() { |
| 129 | 870 if (undoable()) |
| 871 OperationHistoryFactory.getOperationHistory().undo(fUndoContext, null, null); | |
| 872 } | |
| 873 | |
| 874 /* | |
| 875 * @see dwtx.jface.text.IDocumentUndoManager#connect(java.lang.Object) | |
| 876 */ | |
| 877 public void connect(Object client) { | |
| 878 if (!isConnected()) { | |
| 879 initialize(); | |
| 880 } | |
| 881 if (!fConnected.contains(client)) | |
| 882 fConnected.add(client); | |
| 883 } | |
| 884 | |
| 885 /* | |
| 886 * @see dwtx.jface.text.IDocumentUndoManager#disconnect(java.lang.Object) | |
| 887 */ | |
| 888 public void disconnect(Object client) { | |
| 889 fConnected.remove(client); | |
| 890 if (!isConnected()) { | |
| 891 shutdown(); | |
| 892 } | |
| 893 } | |
| 894 | |
| 895 /* | |
| 896 * @see dwtx.jface.text.IDocumentUndoManager#beginCompoundChange() | |
| 897 */ | |
| 898 public void beginCompoundChange() { | |
| 899 if (isConnected()) { | |
| 900 fFoldingIntoCompoundChange= true; | |
| 901 commit(); | |
| 902 } | |
| 903 } | |
| 904 | |
| 905 /* | |
| 906 * @see dwtx.jface.text.IDocumentUndoManager#endCompoundChange() | |
| 907 */ | |
| 908 public void endCompoundChange() { | |
| 909 if (isConnected()) { | |
| 910 fFoldingIntoCompoundChange= false; | |
| 911 commit(); | |
| 912 } | |
| 913 } | |
| 914 | |
| 915 /* | |
| 916 * @see dwtx.jface.text.IDocumentUndoManager#setUndoLimit(int) | |
| 917 */ | |
| 918 public void setMaximalUndoLevel(int undoLimit) { | |
| 919 fHistory.setLimit(fUndoContext, undoLimit); | |
| 920 } | |
| 921 | |
| 922 /** | |
| 923 * Fires a document undo event to all registered document undo listeners. | |
| 924 * Uses a robust iterator. | |
| 130 | 925 * |
| 129 | 926 * @param offset the document offset |
| 927 * @param text the text that was inserted | |
| 928 * @param preservedText the text being replaced | |
| 929 * @param source the source which triggered the event | |
| 930 * @param eventType the type of event causing the change | |
| 931 * @param isCompound a flag indicating whether the change is a compound change | |
| 932 * @see IDocumentUndoListener | |
| 933 */ | |
| 934 void fireDocumentUndo(int offset, String text, String preservedText, Object source, int eventType, bool isCompound) { | |
| 935 eventType= isCompound ? eventType | DocumentUndoEvent.COMPOUND : eventType; | |
| 936 DocumentUndoEvent event= new DocumentUndoEvent(fDocument, offset, text, preservedText, eventType, source); | |
| 937 Object[] listeners= fDocumentUndoListeners.getListeners(); | |
| 938 for (int i= 0; i < listeners.length; i++) { | |
| 134 | 939 (cast(IDocumentUndoListener)listeners[i]).documentUndoNotification(event); |
| 129 | 940 } |
| 941 } | |
| 942 | |
| 943 /** | |
| 944 * Adds any listeners needed to track the document and the operations | |
| 945 * history. | |
| 946 */ | |
| 947 private void addListeners() { | |
| 948 fHistoryListener= new HistoryListener(); | |
| 949 fHistory.addOperationHistoryListener(fHistoryListener); | |
| 950 listenToTextChanges(true); | |
| 951 } | |
| 952 | |
| 953 /** | |
| 954 * Removes any listeners that were installed by the document. | |
| 955 */ | |
| 956 private void removeListeners() { | |
| 957 listenToTextChanges(false); | |
| 958 fHistory.removeOperationHistoryListener(fHistoryListener); | |
| 959 fHistoryListener= null; | |
| 960 } | |
| 961 | |
| 962 /** | |
| 963 * Adds the given text edit to the operation history if it is not part of a | |
| 964 * compound change. | |
| 130 | 965 * |
| 129 | 966 * @param edit |
| 967 * the edit to be added | |
| 968 */ | |
| 969 private void addToOperationHistory(UndoableTextChange edit) { | |
| 970 if (!fFoldingIntoCompoundChange | |
|
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971 || cast(UndoableCompoundTextChange)edit ) { |
| 129 | 972 fHistory.add(edit); |
| 973 fLastAddedTextEdit= edit; | |
| 974 } | |
| 975 } | |
| 976 | |
| 977 /** | |
| 978 * Disposes the undo history. | |
| 979 */ | |
| 980 private void disposeUndoHistory() { | |
| 981 fHistory.dispose(fUndoContext, true, true, true); | |
| 982 } | |
| 983 | |
| 984 /** | |
| 985 * Initializes the undo history. | |
| 986 */ | |
| 987 private void initializeUndoHistory() { | |
| 988 if (fHistory !is null && fUndoContext !is null) | |
| 989 fHistory.dispose(fUndoContext, true, true, false); | |
| 990 | |
| 991 } | |
| 992 | |
| 993 /** | |
| 994 * Checks whether the given text starts with a line delimiter and | |
| 995 * subsequently contains a white space only. | |
| 130 | 996 * |
| 129 | 997 * @param text the text to check |
| 998 * @return <code>true</code> if the text is a line delimiter followed by | |
| 999 * whitespace, <code>false</code> otherwise | |
| 1000 */ | |
| 1001 private bool isWhitespaceText(String text) { | |
| 1002 | |
| 1003 if (text is null || text.length() is 0) | |
| 1004 return false; | |
| 1005 | |
| 1006 String[] delimiters= fDocument.getLegalLineDelimiters(); | |
| 1007 int index= TextUtilities.startsWith(delimiters, text); | |
| 1008 if (index > -1) { | |
| 1009 char c; | |
| 1010 int length= text.length(); | |
| 1011 for (int i= delimiters[index].length(); i < length; i++) { | |
| 1012 c= text.charAt(i); | |
| 1013 if (c !is ' ' && c !is '\t') | |
| 1014 return false; | |
| 1015 } | |
| 1016 return true; | |
| 1017 } | |
| 1018 | |
| 1019 return false; | |
| 1020 } | |
| 1021 | |
| 1022 /** | |
| 1023 * Switches the state of whether there is a text listener or not. | |
| 130 | 1024 * |
| 129 | 1025 * @param listen the state which should be established |
| 1026 */ | |
| 1027 private void listenToTextChanges(bool listen) { | |
| 1028 if (listen) { | |
| 1029 if (fDocumentListener is null && fDocument !is null) { | |
| 1030 fDocumentListener= new DocumentListener(); | |
| 1031 fDocument.addDocumentListener(fDocumentListener); | |
| 1032 } | |
| 1033 } else if (!listen) { | |
| 1034 if (fDocumentListener !is null && fDocument !is null) { | |
| 1035 fDocument.removeDocumentListener(fDocumentListener); | |
| 1036 fDocumentListener= null; | |
| 1037 } | |
| 1038 } | |
| 1039 } | |
| 1040 | |
| 1041 private void processChange(int modelStart, int modelEnd, | |
| 1042 String insertedText, String replacedText, | |
| 1043 long beforeChangeModificationStamp, | |
| 1044 long afterChangeModificationStamp) { | |
| 1045 | |
| 1046 if (insertedText is null) | |
| 1047 insertedText= ""; //$NON-NLS-1$ | |
| 1048 | |
| 1049 if (replacedText is null) | |
| 1050 replacedText= ""; //$NON-NLS-1$ | |
| 1051 | |
| 1052 int length= insertedText.length(); | |
| 1053 int diff= modelEnd - modelStart; | |
| 1054 | |
| 1055 if (fCurrent.fUndoModificationStamp is IDocumentExtension4.UNKNOWN_MODIFICATION_STAMP) | |
| 1056 fCurrent.fUndoModificationStamp= beforeChangeModificationStamp; | |
| 1057 | |
| 1058 // normalize | |
| 1059 if (diff < 0) { | |
| 1060 int tmp= modelEnd; | |
| 1061 modelEnd= modelStart; | |
| 1062 modelStart= tmp; | |
| 1063 } | |
| 1064 | |
| 1065 if (modelStart is modelEnd) { | |
| 1066 // text will be inserted | |
| 1067 if ((length is 1) || isWhitespaceText(insertedText)) { | |
| 1068 // by typing or whitespace | |
| 1069 if (!fInserting | |
| 1070 || (modelStart !is fCurrent.fStart | |
| 1071 + fTextBuffer.length())) { | |
| 1072 fCurrent.fRedoModificationStamp= beforeChangeModificationStamp; | |
| 1073 if (fCurrent.attemptCommit()) | |
| 1074 fCurrent.fUndoModificationStamp= beforeChangeModificationStamp; | |
| 1075 | |
| 1076 fInserting= true; | |
| 1077 } | |
| 1078 if (fCurrent.fStart < 0) | |
| 1079 fCurrent.fStart= fCurrent.fEnd= modelStart; | |
| 1080 if (length > 0) | |
| 1081 fTextBuffer.append(insertedText); | |
| 1082 } else if (length > 0) { | |
| 1083 // by pasting or model manipulation | |
| 1084 fCurrent.fRedoModificationStamp= beforeChangeModificationStamp; | |
| 1085 if (fCurrent.attemptCommit()) | |
| 1086 fCurrent.fUndoModificationStamp= beforeChangeModificationStamp; | |
| 1087 | |
| 1088 fCurrent.fStart= fCurrent.fEnd= modelStart; | |
| 1089 fTextBuffer.append(insertedText); | |
| 1090 fCurrent.fRedoModificationStamp= afterChangeModificationStamp; | |
| 1091 if (fCurrent.attemptCommit()) | |
| 1092 fCurrent.fUndoModificationStamp= afterChangeModificationStamp; | |
| 1093 | |
| 1094 } | |
| 1095 } else { | |
| 1096 if (length is 0) { | |
| 1097 // text will be deleted by backspace or DEL key or empty | |
| 1098 // clipboard | |
| 1099 length= replacedText.length(); | |
| 1100 String[] delimiters= fDocument.getLegalLineDelimiters(); | |
| 1101 | |
| 1102 if ((length is 1) | |
| 1103 || TextUtilities.equals(delimiters, replacedText) > -1) { | |
| 1104 | |
| 1105 // whereby selection is empty | |
| 1106 | |
| 1107 if (fPreviousDelete.fStart is modelStart | |
| 1108 && fPreviousDelete.fEnd is modelEnd) { | |
| 1109 // repeated DEL | |
| 1110 | |
| 1111 // correct wrong settings of fCurrent | |
| 1112 if (fCurrent.fStart is modelEnd | |
| 1113 && fCurrent.fEnd is modelStart) { | |
| 1114 fCurrent.fStart= modelStart; | |
| 1115 fCurrent.fEnd= modelEnd; | |
| 1116 } | |
| 1117 // append to buffer && extend edit range | |
| 1118 fPreservedTextBuffer.append(replacedText); | |
| 1119 ++fCurrent.fEnd; | |
| 1120 | |
| 1121 } else if (fPreviousDelete.fStart is modelEnd) { | |
| 1122 // repeated backspace | |
| 1123 | |
| 1124 // insert in buffer and extend edit range | |
| 1125 fPreservedTextBuffer.insert(0, replacedText); | |
| 1126 fCurrent.fStart= modelStart; | |
| 1127 | |
| 1128 } else { | |
| 1129 // either DEL or backspace for the first time | |
| 1130 | |
| 1131 fCurrent.fRedoModificationStamp= beforeChangeModificationStamp; | |
| 1132 if (fCurrent.attemptCommit()) | |
| 1133 fCurrent.fUndoModificationStamp= beforeChangeModificationStamp; | |
| 1134 | |
| 1135 // as we can not decide whether it was DEL or backspace | |
| 1136 // we initialize for backspace | |
| 1137 fPreservedTextBuffer.append(replacedText); | |
| 1138 fCurrent.fStart= modelStart; | |
| 1139 fCurrent.fEnd= modelEnd; | |
| 1140 } | |
| 1141 | |
| 1142 fPreviousDelete.set(modelStart, modelEnd); | |
| 1143 | |
| 1144 } else if (length > 0) { | |
| 1145 // whereby selection is not empty | |
| 1146 fCurrent.fRedoModificationStamp= beforeChangeModificationStamp; | |
| 1147 if (fCurrent.attemptCommit()) | |
| 1148 fCurrent.fUndoModificationStamp= beforeChangeModificationStamp; | |
| 1149 | |
| 1150 fCurrent.fStart= modelStart; | |
| 1151 fCurrent.fEnd= modelEnd; | |
| 1152 fPreservedTextBuffer.append(replacedText); | |
| 1153 } | |
| 1154 } else { | |
| 1155 // text will be replaced | |
| 1156 | |
| 1157 if (length is 1) { | |
| 1158 length= replacedText.length(); | |
| 1159 String[] delimiters= fDocument.getLegalLineDelimiters(); | |
| 1160 | |
| 1161 if ((length is 1) | |
| 1162 || TextUtilities.equals(delimiters, replacedText) > -1) { | |
| 1163 // because of overwrite mode or model manipulation | |
| 1164 if (!fOverwriting | |
| 1165 || (modelStart !is fCurrent.fStart | |
| 1166 + fTextBuffer.length())) { | |
| 1167 fCurrent.fRedoModificationStamp= beforeChangeModificationStamp; | |
| 1168 if (fCurrent.attemptCommit()) | |
| 1169 fCurrent.fUndoModificationStamp= beforeChangeModificationStamp; | |
| 1170 | |
| 1171 fOverwriting= true; | |
| 1172 } | |
| 1173 | |
| 1174 if (fCurrent.fStart < 0) | |
| 1175 fCurrent.fStart= modelStart; | |
| 1176 | |
| 1177 fCurrent.fEnd= modelEnd; | |
| 1178 fTextBuffer.append(insertedText); | |
| 1179 fPreservedTextBuffer.append(replacedText); | |
| 1180 fCurrent.fRedoModificationStamp= afterChangeModificationStamp; | |
| 1181 return; | |
| 1182 } | |
| 1183 } | |
| 1184 // because of typing or pasting whereby selection is not empty | |
| 1185 fCurrent.fRedoModificationStamp= beforeChangeModificationStamp; | |
| 1186 if (fCurrent.attemptCommit()) | |
| 1187 fCurrent.fUndoModificationStamp= beforeChangeModificationStamp; | |
| 1188 | |
| 1189 fCurrent.fStart= modelStart; | |
| 1190 fCurrent.fEnd= modelEnd; | |
| 1191 fTextBuffer.append(insertedText); | |
| 1192 fPreservedTextBuffer.append(replacedText); | |
| 1193 } | |
| 1194 } | |
| 1195 // in all cases, the redo modification stamp is updated on the open | |
| 1196 // text edit | |
| 1197 fCurrent.fRedoModificationStamp= afterChangeModificationStamp; | |
| 1198 } | |
| 1199 | |
| 1200 /** | |
| 1201 * Initialize the receiver. | |
| 1202 */ | |
| 1203 private void initialize() { | |
| 1204 initializeUndoHistory(); | |
| 1205 | |
| 1206 // open up the current text edit | |
| 1207 fCurrent= new UndoableTextChange(this); | |
| 1208 fPreviousDelete= new UndoableTextChange(this); | |
| 1209 fTextBuffer= new StringBuffer(); | |
| 1210 fPreservedTextBuffer= new StringBuffer(); | |
| 1211 | |
| 1212 addListeners(); | |
| 1213 } | |
| 130 | 1214 |
| 129 | 1215 /** |
| 1216 * Reset processChange state. | |
| 130 | 1217 * |
| 129 | 1218 * @since 3.2 |
| 1219 */ | |
| 1220 private void resetProcessChangeState() { | |
| 1221 fInserting= false; | |
| 1222 fOverwriting= false; | |
| 1223 fPreviousDelete.reinitialize(); | |
| 1224 } | |
| 1225 | |
| 1226 /** | |
| 1227 * Shutdown the receiver. | |
| 1228 */ | |
| 1229 private void shutdown() { | |
| 1230 removeListeners(); | |
| 1231 | |
| 1232 fCurrent= null; | |
| 1233 fPreviousDelete= null; | |
| 1234 fTextBuffer= null; | |
| 1235 fPreservedTextBuffer= null; | |
| 1236 | |
| 1237 disposeUndoHistory(); | |
| 1238 } | |
| 1239 | |
| 1240 /** | |
| 1241 * Return whether or not any clients are connected to the receiver. | |
| 130 | 1242 * |
| 129 | 1243 * @return <code>true</code> if the receiver is connected to |
| 1244 * clients, <code>false</code> if it is not | |
| 1245 */ | |
| 1246 bool isConnected() { | |
| 1247 if (fConnected is null) | |
| 1248 return false; | |
| 1249 return !fConnected.isEmpty(); | |
| 1250 } | |
| 1251 | |
| 1252 /* | |
| 1253 * @see dwtx.jface.text.IDocumentUndoManager#transferUndoHistory(IDocumentUndoManager) | |
| 1254 */ | |
| 1255 public void transferUndoHistory(IDocumentUndoManager manager) { | |
| 1256 IUndoContext oldUndoContext= manager.getUndoContext(); | |
| 1257 // Get the history for the old undo context. | |
| 1258 IUndoableOperation [] operations= OperationHistoryFactory.getOperationHistory().getUndoHistory(oldUndoContext); | |
| 1259 for (int i= 0; i < operations.length; i++) { | |
| 1260 // First replace the undo context | |
| 1261 IUndoableOperation op= operations[i]; | |
|
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1262 if (cast(IContextReplacingOperation)op ) { |
| 134 | 1263 (cast(IContextReplacingOperation)op).replaceContext(oldUndoContext, getUndoContext()); |
| 129 | 1264 } else { |
| 1265 op.addContext(getUndoContext()); | |
| 1266 op.removeContext(oldUndoContext); | |
| 1267 } | |
| 1268 // Now update the manager that owns the text edit. | |
|
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1269 if (cast(UndoableTextChange)op ) { |
| 134 | 1270 (cast(UndoableTextChange)op).fDocumentUndoManager= this; |
| 129 | 1271 } |
| 1272 } | |
| 130 | 1273 |
| 129 | 1274 IUndoableOperation op= OperationHistoryFactory.getOperationHistory().getUndoOperation(getUndoContext()); |
|
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1275 if (op !is null && !(cast(UndoableTextChange)op )) |
| 129 | 1276 return; |
| 130 | 1277 |
| 129 | 1278 // Record the transfer itself as an undoable change. |
| 1279 // If the transfer results from some open operation, recording this change will | |
| 1280 // cause our undo context to be added to the outer operation. If there is no | |
| 1281 // outer operation, there will be a local change to signify the transfer. | |
| 1282 // This also serves to synchronize the modification stamps with the documents. | |
| 1283 UndoableTextChange cmd= new UndoableTextChange(this); | |
| 1284 cmd.fStart= cmd.fEnd= 0; | |
| 1285 cmd.fText= cmd.fPreservedText= ""; //$NON-NLS-1$ | |
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1286 if (cast(IDocumentExtension4)fDocument ) { |
| 134 | 1287 cmd.fRedoModificationStamp= (cast(IDocumentExtension4)fDocument).getModificationStamp(); |
| 129 | 1288 if (op !is null) |
| 134 | 1289 cmd.fUndoModificationStamp= (cast(UndoableTextChange)op).fRedoModificationStamp; |
| 129 | 1290 } |
| 1291 addToOperationHistory(cmd); | |
| 1292 } | |
| 1293 | |
| 130 | 1294 |
| 129 | 1295 } |