2 * RichEdit - functions dealing with editor object
4 * Copyright 2004 by Krzysztof Foltman
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
23 WINE_DEFAULT_DEBUG_CHANNEL(richedit);
25 void ME_EmptyUndoStack(ME_TextEditor *editor)
27 ME_DisplayItem *p, *pNext;
29 if (editor->nUndoMode == umIgnore)
32 TRACE("Emptying undo stack\n");
34 p = editor->pUndoStack;
35 editor->pUndoStack = editor->pUndoStackBottom = NULL;
36 editor->nUndoStackSize = 0;
39 ME_DestroyDisplayItem(p);
42 p = editor->pRedoStack;
43 editor->pRedoStack = NULL;
46 ME_DestroyDisplayItem(p);
51 ME_UndoItem *ME_AddUndoItem(ME_TextEditor *editor, ME_DIType type, const ME_DisplayItem *pdi) {
52 if (editor->nUndoMode == umIgnore)
54 else if (editor->nUndoLimit == 0)
58 ME_DisplayItem *pItem = ALLOC_OBJ(ME_UndoItem);
61 case diUndoPotentialEndTransaction:
62 /* only should be added for manually typed chars, not undos or redos */
63 assert(editor->nUndoMode == umAddToUndo);
64 /* intentional fall-through to next case */
65 case diUndoEndTransaction:
67 case diUndoSetParagraphFormat:
69 pItem->member.para = pdi->member.para;
70 pItem->member.para.pFmt = ALLOC_OBJ(PARAFORMAT2);
71 *pItem->member.para.pFmt = *pdi->member.para.pFmt;
75 pItem->member.run = pdi->member.run;
76 pItem->member.run.strText = ME_StrDup(pItem->member.run.strText);
77 ME_AddRefStyle(pItem->member.run.style);
78 if (pdi->member.run.ole_obj)
80 pItem->member.run.ole_obj = ALLOC_OBJ(*pItem->member.run.ole_obj);
81 ME_CopyReObject(pItem->member.run.ole_obj, pdi->member.run.ole_obj);
83 else pItem->member.run.ole_obj = NULL;
85 case diUndoSetCharFormat:
88 case diUndoJoinParagraphs:
90 case diUndoSplitParagraph:
92 ME_DisplayItem *prev_para = pdi->member.para.prev_para;
93 assert(pdi->member.para.pFmt->cbSize == sizeof(PARAFORMAT2));
94 pItem->member.para.pFmt = ALLOC_OBJ(PARAFORMAT2);
95 pItem->member.para.pFmt->cbSize = sizeof(PARAFORMAT2);
96 pItem->member.para.pFmt->dwMask = 0;
97 *pItem->member.para.pFmt = *pdi->member.para.pFmt;
98 pItem->member.para.border = pdi->member.para.border;
99 pItem->member.para.nFlags = prev_para->member.para.nFlags & ~MEPF_CELL;
100 pItem->member.para.pCell = NULL;
104 assert(0 == "AddUndoItem, unsupported item type");
109 if (editor->nUndoMode == umAddToUndo || editor->nUndoMode == umAddBackToUndo)
111 if (editor->pUndoStack
112 && editor->pUndoStack->type == diUndoPotentialEndTransaction)
114 editor->pUndoStack->type = diUndoEndTransaction;
116 if (editor->nUndoMode == umAddToUndo)
117 TRACE("Pushing id=%s to undo stack, deleting redo stack\n", ME_GetDITypeName(type));
119 TRACE("Pushing id=%s to undo stack\n", ME_GetDITypeName(type));
121 pItem->next = editor->pUndoStack;
122 if (type == diUndoEndTransaction || type == diUndoPotentialEndTransaction)
123 editor->nUndoStackSize++;
124 if (editor->pUndoStack)
125 editor->pUndoStack->prev = pItem;
127 editor->pUndoStackBottom = pItem;
128 editor->pUndoStack = pItem;
130 if (editor->nUndoStackSize > editor->nUndoLimit)
131 { /* remove oldest undo from stack */
132 ME_DisplayItem *p = editor->pUndoStackBottom;
133 while (p->type !=diUndoEndTransaction)
134 p = p->prev; /*find new stack bottom */
135 editor->pUndoStackBottom = p->prev;
136 editor->pUndoStackBottom->next = NULL;
139 ME_DisplayItem *pp = p->next;
140 ME_DestroyDisplayItem(p);
143 editor->nUndoStackSize--;
145 /* any new operation (not redo) clears the redo stack */
146 if (editor->nUndoMode == umAddToUndo) {
147 ME_DisplayItem *p = editor->pRedoStack;
150 ME_DisplayItem *pp = p->next;
151 ME_DestroyDisplayItem(p);
154 editor->pRedoStack = NULL;
157 else if (editor->nUndoMode == umAddToRedo)
159 TRACE("Pushing id=%s to redo stack\n", ME_GetDITypeName(type));
160 pItem->next = editor->pRedoStack;
161 if (editor->pRedoStack)
162 editor->pRedoStack->prev = pItem;
163 editor->pRedoStack = pItem;
167 return (ME_UndoItem *)pItem;
172 * Commits preceding changes into a transaction that can be undone together.
174 * This should be called after all the changes occur associated with an event
175 * so that the group of changes can be undone atomically as a transaction.
177 * This will have no effect the undo mode is set to ignore changes, or if no
178 * changes preceded calling this function before the last time it was called.
180 * This can also be used to conclude a coalescing transaction (used for grouping
183 void ME_CommitUndo(ME_TextEditor *editor) {
184 if (editor->nUndoMode == umIgnore)
187 assert(editor->nUndoMode == umAddToUndo);
189 /* no transactions, no need to commit */
190 if (!editor->pUndoStack)
193 /* no need to commit empty transactions */
194 if (editor->pUndoStack->type == diUndoEndTransaction)
197 if (editor->pUndoStack->type == diUndoPotentialEndTransaction)
199 /* Previous transaction was as a result of characters typed,
200 * so the end of this transaction is confirmed. */
201 editor->pUndoStack->type = diUndoEndTransaction;
205 ME_AddUndoItem(editor, diUndoEndTransaction, NULL);
209 * Groups subsequent changes with previous ones for an undo if coalescing.
211 * Has no effect if the previous changes were followed by a ME_CommitUndo. This
212 * function will only have an affect if the previous changes were followed by
213 * a call to ME_CommitCoalescingUndo, which allows the transaction to be
216 * This allows multiple consecutively typed characters to be grouped together
217 * to be undone by a single undo operation.
219 void ME_ContinueCoalescingTransaction(ME_TextEditor *editor)
223 if (editor->nUndoMode == umIgnore)
226 assert(editor->nUndoMode == umAddToUndo);
228 p = editor->pUndoStack;
230 if (p && p->type == diUndoPotentialEndTransaction) {
231 assert(p->next); /* EndTransactions shouldn't be at bottom of undo stack */
232 editor->pUndoStack = p->next;
233 editor->pUndoStack->prev = NULL;
234 editor->nUndoStackSize--;
235 ME_DestroyDisplayItem(p);
240 * Commits preceding changes into a undo transaction that can be expanded.
242 * This function allows the transaction to be reopened with
243 * ME_ContinueCoalescingTransaction in order to continue the transaction. If an
244 * undo item is added to the undo stack as a result of a change without the
245 * transaction being reopened, then the transaction will be ended, and the
246 * changes will become a part of the next transaction.
248 * This is used to allow typed characters to be grouped together since each
249 * typed character results in a single event, and each event adding undo items
250 * must be committed. Using this function as opposed to ME_CommitUndo allows
251 * multiple events to be grouped, and undone together.
253 void ME_CommitCoalescingUndo(ME_TextEditor *editor)
255 if (editor->nUndoMode == umIgnore)
258 assert(editor->nUndoMode == umAddToUndo);
260 /* no transactions, no need to commit */
261 if (!editor->pUndoStack)
264 /* no need to commit empty transactions */
265 if (editor->pUndoStack->type == diUndoEndTransaction)
267 if (editor->pUndoStack->type == diUndoPotentialEndTransaction)
270 ME_AddUndoItem(editor, diUndoPotentialEndTransaction, NULL);
273 static void ME_PlayUndoItem(ME_TextEditor *editor, ME_DisplayItem *pItem)
275 ME_UndoItem *pUItem = (ME_UndoItem *)pItem;
277 if (editor->nUndoMode == umIgnore)
279 TRACE("Playing undo/redo item, id=%s\n", ME_GetDITypeName(pItem->type));
283 case diUndoPotentialEndTransaction:
284 case diUndoEndTransaction:
286 case diUndoSetParagraphFormat:
289 ME_DisplayItem *para;
290 ME_CursorFromCharOfs(editor, pItem->member.para.nCharOfs, &tmp);
291 para = ME_FindItemBack(tmp.pRun, diParagraph);
292 ME_AddUndoItem(editor, diUndoSetParagraphFormat, para);
293 *para->member.para.pFmt = *pItem->member.para.pFmt;
294 para->member.para.border = pItem->member.para.border;
297 case diUndoSetCharFormat:
299 ME_Cursor start, end;
300 ME_CursorFromCharOfs(editor, pUItem->nStart, &start);
302 ME_MoveCursorChars(editor, &end, pUItem->nLen);
303 ME_SetCharFormat(editor, &start, &end, &pItem->member.ustyle->fmt);
306 case diUndoInsertRun:
309 ME_CursorFromCharOfs(editor, pItem->member.run.nCharOfs, &tmp);
310 ME_InsertRunAtCursor(editor, &tmp, pItem->member.run.style,
311 pItem->member.run.strText->szData,
312 pItem->member.run.strText->nLen,
313 pItem->member.run.nFlags);
316 case diUndoDeleteRun:
319 ME_CursorFromCharOfs(editor, pUItem->nStart, &tmp);
320 ME_InternalDeleteText(editor, &tmp, pUItem->nLen, TRUE);
323 case diUndoJoinParagraphs:
326 ME_CursorFromCharOfs(editor, pUItem->nStart, &tmp);
327 /* the only thing that's needed is paragraph offset, so no need to split runs */
328 ME_JoinParagraphs(editor, tmp.pPara, TRUE);
331 case diUndoSplitParagraph:
334 ME_DisplayItem *this_para, *new_para;
336 int paraFlags = pItem->member.para.nFlags & (MEPF_ROWSTART|MEPF_CELL|MEPF_ROWEND);
337 ME_CursorFromCharOfs(editor, pUItem->nStart, &tmp);
339 ME_SplitRunSimple(editor, &tmp);
340 assert(pUItem->eol_str);
341 this_para = tmp.pPara;
342 bFixRowStart = this_para->member.para.nFlags & MEPF_ROWSTART;
345 /* Re-insert the paragraph before the table, making sure the nFlag value
347 this_para->member.para.nFlags &= ~MEPF_ROWSTART;
349 new_para = ME_SplitParagraph(editor, tmp.pRun, tmp.pRun->member.run.style,
350 pUItem->eol_str, paraFlags);
352 new_para->member.para.nFlags |= MEPF_ROWSTART;
353 assert(pItem->member.para.pFmt->cbSize == sizeof(PARAFORMAT2));
354 *new_para->member.para.pFmt = *pItem->member.para.pFmt;
355 new_para->member.para.border = pItem->member.para.border;
356 if (pItem->member.para.pCell)
358 ME_DisplayItem *pItemCell, *pCell;
359 pItemCell = pItem->member.para.pCell;
360 pCell = new_para->member.para.pCell;
361 pCell->member.cell.nRightBoundary = pItemCell->member.cell.nRightBoundary;
362 pCell->member.cell.border = pItemCell->member.cell.border;
367 assert(0 == "PlayUndoItem, unexpected type");
371 BOOL ME_Undo(ME_TextEditor *editor) {
373 ME_UndoMode nMode = editor->nUndoMode;
375 if (editor->nUndoMode == umIgnore)
377 assert(nMode == umAddToUndo || nMode == umIgnore);
379 /* no undo items ? */
380 if (!editor->pUndoStack)
383 /* watch out for uncommitted transactions ! */
384 assert(editor->pUndoStack->type == diUndoEndTransaction
385 || editor->pUndoStack->type == diUndoPotentialEndTransaction);
387 editor->nUndoMode = umAddToRedo;
388 p = editor->pUndoStack->next;
389 ME_DestroyDisplayItem(editor->pUndoStack);
390 editor->pUndoStack = p;
393 ME_PlayUndoItem(editor, p);
394 editor->pUndoStack = p->next;
395 ME_DestroyDisplayItem(p);
396 p = editor->pUndoStack;
397 } while(p && p->type != diUndoEndTransaction);
400 ME_MoveCursorFromTableRowStartParagraph(editor);
401 ME_AddUndoItem(editor, diUndoEndTransaction, NULL);
402 ME_CheckTablesForCorruption(editor);
403 editor->nUndoStackSize--;
404 editor->nUndoMode = nMode;
405 ME_UpdateRepaint(editor, FALSE);
409 BOOL ME_Redo(ME_TextEditor *editor) {
411 ME_UndoMode nMode = editor->nUndoMode;
413 assert(nMode == umAddToUndo || nMode == umIgnore);
415 if (editor->nUndoMode == umIgnore)
417 /* no redo items ? */
418 if (!editor->pRedoStack)
421 /* watch out for uncommitted transactions ! */
422 assert(editor->pRedoStack->type == diUndoEndTransaction);
424 editor->nUndoMode = umAddBackToUndo;
425 p = editor->pRedoStack->next;
426 ME_DestroyDisplayItem(editor->pRedoStack);
427 editor->pRedoStack = p;
430 ME_PlayUndoItem(editor, p);
431 editor->pRedoStack = p->next;
432 ME_DestroyDisplayItem(p);
433 p = editor->pRedoStack;
434 } while(p && p->type != diUndoEndTransaction);
437 ME_MoveCursorFromTableRowStartParagraph(editor);
438 ME_AddUndoItem(editor, diUndoEndTransaction, NULL);
439 ME_CheckTablesForCorruption(editor);
440 editor->nUndoMode = nMode;
441 ME_UpdateRepaint(editor, FALSE);