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 static void destroy_undo_item( struct undo_item *undo )
30 heap_free( undo->u.insert_run.str );
31 ME_ReleaseStyle( undo->u.insert_run.style );
34 ME_DestroyString( undo->u.split_para.eol_str );
43 static void empty_redo_stack(ME_TextEditor *editor)
45 struct undo_item *cursor, *cursor2;
46 LIST_FOR_EACH_ENTRY_SAFE( cursor, cursor2, &editor->redo_stack, struct undo_item, entry )
48 list_remove( &cursor->entry );
49 destroy_undo_item( cursor );
53 void ME_EmptyUndoStack(ME_TextEditor *editor)
55 struct undo_item *cursor, *cursor2;
56 if (editor->nUndoMode == umIgnore)
59 TRACE("Emptying undo stack\n");
61 editor->nUndoStackSize = 0;
63 LIST_FOR_EACH_ENTRY_SAFE( cursor, cursor2, &editor->undo_stack, struct undo_item, entry )
65 list_remove( &cursor->entry );
66 destroy_undo_item( cursor );
69 empty_redo_stack( editor );
72 static struct undo_item *add_undo( ME_TextEditor *editor, enum undo_type type )
74 struct undo_item *undo, *item;
77 if (editor->nUndoMode == umIgnore) return NULL;
78 if (editor->nUndoLimit == 0) return NULL;
80 undo = heap_alloc( sizeof(*undo) );
81 if (!undo) return NULL;
84 if (editor->nUndoMode == umAddToUndo || editor->nUndoMode == umAddBackToUndo)
87 head = list_head( &editor->undo_stack );
90 item = LIST_ENTRY( head, struct undo_item, entry );
91 if (item->type == undo_potential_end_transaction)
92 item->type = undo_end_transaction;
95 if (editor->nUndoMode == umAddToUndo)
96 TRACE("Pushing id=%d to undo stack, deleting redo stack\n", type);
98 TRACE("Pushing id=%d to undo stack\n", type);
100 list_add_head( &editor->undo_stack, &undo->entry );
102 if (type == undo_end_transaction || type == undo_potential_end_transaction)
103 editor->nUndoStackSize++;
105 if (editor->nUndoStackSize > editor->nUndoLimit)
107 struct undo_item *cursor2;
108 /* remove oldest undo from stack */
109 LIST_FOR_EACH_ENTRY_SAFE_REV( item, cursor2, &editor->undo_stack, struct undo_item, entry )
111 BOOL done = (item->type == undo_end_transaction);
112 list_remove( &item->entry );
113 destroy_undo_item( item );
116 editor->nUndoStackSize--;
119 /* any new operation (not redo) clears the redo stack */
120 if (editor->nUndoMode == umAddToUndo) empty_redo_stack( editor );
122 else if (editor->nUndoMode == umAddToRedo)
124 TRACE("Pushing id=%d to redo stack\n", type);
125 list_add_head( &editor->redo_stack, &undo->entry );
131 BOOL add_undo_insert_run( ME_TextEditor *editor, int pos, const WCHAR *str, int len, int flags, ME_Style *style )
133 struct undo_item *undo = add_undo( editor, undo_insert_run );
134 if (!undo) return FALSE;
136 undo->u.insert_run.str = heap_alloc( (len + 1) * sizeof(WCHAR) );
137 if (!undo->u.insert_run.str)
139 ME_EmptyUndoStack( editor );
142 memcpy( undo->u.insert_run.str, str, len * sizeof(WCHAR) );
143 undo->u.insert_run.str[len] = 0;
144 undo->u.insert_run.pos = pos;
145 undo->u.insert_run.len = len;
146 undo->u.insert_run.flags = flags;
147 undo->u.insert_run.style = style;
148 ME_AddRefStyle( style );
152 BOOL add_undo_set_para_fmt( ME_TextEditor *editor, const ME_Paragraph *para )
154 struct undo_item *undo = add_undo( editor, undo_set_para_fmt );
155 if (!undo) return FALSE;
157 undo->u.set_para_fmt.pos = para->nCharOfs;
158 undo->u.set_para_fmt.fmt = *para->pFmt;
159 undo->u.set_para_fmt.border = para->border;
164 BOOL add_undo_set_char_fmt( ME_TextEditor *editor, int pos, int len, const CHARFORMAT2W *fmt )
166 struct undo_item *undo = add_undo( editor, undo_set_char_fmt );
167 if (!undo) return FALSE;
169 undo->u.set_char_fmt.pos = pos;
170 undo->u.set_char_fmt.len = len;
171 undo->u.set_char_fmt.fmt = *fmt;
176 BOOL add_undo_join_paras( ME_TextEditor *editor, int pos )
178 struct undo_item *undo = add_undo( editor, undo_join_paras );
179 if (!undo) return FALSE;
181 undo->u.join_paras.pos = pos;
185 BOOL add_undo_split_para( ME_TextEditor *editor, const ME_Paragraph *para, const ME_Run *run, const ME_Cell *cell )
187 struct undo_item *undo = add_undo( editor, undo_split_para );
188 if (!undo) return FALSE;
190 undo->u.split_para.pos = para->nCharOfs - run->strText->nLen;
191 undo->u.split_para.eol_str = ME_StrDup( run->strText );
192 undo->u.split_para.fmt = *para->pFmt;
193 undo->u.split_para.border = para->border;
194 undo->u.split_para.flags = para->prev_para->member.para.nFlags & ~MEPF_CELL;
198 undo->u.split_para.cell_border = cell->border;
199 undo->u.split_para.cell_right_boundary = cell->nRightBoundary;
204 BOOL add_undo_delete_run( ME_TextEditor *editor, int pos, int len )
206 struct undo_item *undo = add_undo( editor, undo_delete_run );
207 if (!undo) return FALSE;
209 undo->u.delete_run.pos = pos;
210 undo->u.delete_run.len = len;
216 * Commits preceding changes into a transaction that can be undone together.
218 * This should be called after all the changes occur associated with an event
219 * so that the group of changes can be undone atomically as a transaction.
221 * This will have no effect the undo mode is set to ignore changes, or if no
222 * changes preceded calling this function before the last time it was called.
224 * This can also be used to conclude a coalescing transaction (used for grouping
227 void ME_CommitUndo(ME_TextEditor *editor)
229 struct undo_item *item;
232 if (editor->nUndoMode == umIgnore)
235 assert(editor->nUndoMode == umAddToUndo);
237 /* no transactions, no need to commit */
238 head = list_head( &editor->undo_stack );
241 /* no need to commit empty transactions */
242 item = LIST_ENTRY( head, struct undo_item, entry );
243 if (item->type == undo_end_transaction) return;
245 if (item->type == undo_potential_end_transaction)
247 item->type = undo_end_transaction;
251 add_undo( editor, undo_end_transaction );
255 * Groups subsequent changes with previous ones for an undo if coalescing.
257 * Has no effect if the previous changes were followed by a ME_CommitUndo. This
258 * function will only have an affect if the previous changes were followed by
259 * a call to ME_CommitCoalescingUndo, which allows the transaction to be
262 * This allows multiple consecutively typed characters to be grouped together
263 * to be undone by a single undo operation.
265 void ME_ContinueCoalescingTransaction(ME_TextEditor *editor)
267 struct undo_item *item;
270 if (editor->nUndoMode == umIgnore)
273 assert(editor->nUndoMode == umAddToUndo);
275 head = list_head( &editor->undo_stack );
278 item = LIST_ENTRY( head, struct undo_item, entry );
279 if (item->type == undo_potential_end_transaction)
281 list_remove( &item->entry );
282 editor->nUndoStackSize--;
283 destroy_undo_item( item );
288 * Commits preceding changes into a undo transaction that can be expanded.
290 * This function allows the transaction to be reopened with
291 * ME_ContinueCoalescingTransaction in order to continue the transaction. If an
292 * undo item is added to the undo stack as a result of a change without the
293 * transaction being reopened, then the transaction will be ended, and the
294 * changes will become a part of the next transaction.
296 * This is used to allow typed characters to be grouped together since each
297 * typed character results in a single event, and each event adding undo items
298 * must be committed. Using this function as opposed to ME_CommitUndo allows
299 * multiple events to be grouped, and undone together.
301 void ME_CommitCoalescingUndo(ME_TextEditor *editor)
303 struct undo_item *item;
306 if (editor->nUndoMode == umIgnore)
309 assert(editor->nUndoMode == umAddToUndo);
311 head = list_head( &editor->undo_stack );
314 /* no need to commit empty transactions */
315 item = LIST_ENTRY( head, struct undo_item, entry );
316 if (item->type == undo_end_transaction ||
317 item->type == undo_potential_end_transaction)
320 add_undo( editor, undo_potential_end_transaction );
323 static void ME_PlayUndoItem(ME_TextEditor *editor, struct undo_item *undo)
326 if (editor->nUndoMode == umIgnore)
328 TRACE("Playing undo/redo item, id=%d\n", undo->type);
332 case undo_potential_end_transaction:
333 case undo_end_transaction:
335 case undo_set_para_fmt:
338 ME_DisplayItem *para;
339 ME_CursorFromCharOfs(editor, undo->u.set_para_fmt.pos, &tmp);
340 para = ME_FindItemBack(tmp.pRun, diParagraph);
341 add_undo_set_para_fmt( editor, ¶->member.para );
342 *para->member.para.pFmt = undo->u.set_para_fmt.fmt;
343 para->member.para.border = undo->u.set_para_fmt.border;
346 case undo_set_char_fmt:
348 ME_Cursor start, end;
349 ME_CursorFromCharOfs(editor, undo->u.set_char_fmt.pos, &start);
351 ME_MoveCursorChars(editor, &end, undo->u.set_char_fmt.len);
352 ME_SetCharFormat(editor, &start, &end, &undo->u.set_char_fmt.fmt);
355 case undo_insert_run:
358 ME_CursorFromCharOfs(editor, undo->u.insert_run.pos, &tmp);
359 ME_InsertRunAtCursor(editor, &tmp, undo->u.insert_run.style,
360 undo->u.insert_run.str,
361 undo->u.insert_run.len,
362 undo->u.insert_run.flags);
365 case undo_delete_run:
368 ME_CursorFromCharOfs(editor, undo->u.delete_run.pos, &tmp);
369 ME_InternalDeleteText(editor, &tmp, undo->u.delete_run.len, TRUE);
372 case undo_join_paras:
375 ME_CursorFromCharOfs(editor, undo->u.join_paras.pos, &tmp);
376 ME_JoinParagraphs(editor, tmp.pPara, TRUE);
379 case undo_split_para:
382 ME_DisplayItem *this_para, *new_para;
384 int paraFlags = undo->u.split_para.flags & (MEPF_ROWSTART|MEPF_CELL|MEPF_ROWEND);
385 ME_CursorFromCharOfs(editor, undo->u.split_para.pos, &tmp);
387 ME_SplitRunSimple(editor, &tmp);
388 this_para = tmp.pPara;
389 bFixRowStart = this_para->member.para.nFlags & MEPF_ROWSTART;
392 /* Re-insert the paragraph before the table, making sure the nFlag value
394 this_para->member.para.nFlags &= ~MEPF_ROWSTART;
396 new_para = ME_SplitParagraph(editor, tmp.pRun, tmp.pRun->member.run.style,
397 undo->u.split_para.eol_str, paraFlags);
398 /* ME_SplitParagraph owns eol_str */
399 undo->u.split_para.eol_str = NULL;
401 new_para->member.para.nFlags |= MEPF_ROWSTART;
402 *new_para->member.para.pFmt = undo->u.split_para.fmt;
403 new_para->member.para.border = undo->u.split_para.border;
406 ME_DisplayItem *pCell = new_para->member.para.pCell;
407 pCell->member.cell.nRightBoundary = undo->u.split_para.cell_right_boundary;
408 pCell->member.cell.border = undo->u.split_para.cell_border;
415 BOOL ME_Undo(ME_TextEditor *editor)
417 ME_UndoMode nMode = editor->nUndoMode;
419 struct undo_item *undo, *cursor2;
421 if (editor->nUndoMode == umIgnore) return FALSE;
422 assert(nMode == umAddToUndo || nMode == umIgnore);
424 head = list_head( &editor->undo_stack );
425 if (!head) return FALSE;
427 /* watch out for uncommitted transactions ! */
428 undo = LIST_ENTRY( head, struct undo_item, entry );
429 assert(undo->type == undo_end_transaction
430 || undo->type == undo_potential_end_transaction);
432 editor->nUndoMode = umAddToRedo;
434 list_remove( &undo->entry );
435 destroy_undo_item( undo );
437 LIST_FOR_EACH_ENTRY_SAFE( undo, cursor2, &editor->undo_stack, struct undo_item, entry )
439 if (undo->type == undo_end_transaction) break;
440 ME_PlayUndoItem( editor, undo );
441 list_remove( &undo->entry );
442 destroy_undo_item( undo );
445 ME_MoveCursorFromTableRowStartParagraph(editor);
446 add_undo( editor, undo_end_transaction );
447 ME_CheckTablesForCorruption(editor);
448 editor->nUndoStackSize--;
449 editor->nUndoMode = nMode;
450 ME_UpdateRepaint(editor, FALSE);
454 BOOL ME_Redo(ME_TextEditor *editor)
456 ME_UndoMode nMode = editor->nUndoMode;
458 struct undo_item *undo, *cursor2;
460 assert(nMode == umAddToUndo || nMode == umIgnore);
462 if (editor->nUndoMode == umIgnore) return FALSE;
464 head = list_head( &editor->redo_stack );
465 if (!head) return FALSE;
467 /* watch out for uncommitted transactions ! */
468 undo = LIST_ENTRY( head, struct undo_item, entry );
469 assert( undo->type == undo_end_transaction );
471 editor->nUndoMode = umAddBackToUndo;
472 list_remove( &undo->entry );
473 destroy_undo_item( undo );
475 LIST_FOR_EACH_ENTRY_SAFE( undo, cursor2, &editor->redo_stack, struct undo_item, entry )
477 if (undo->type == undo_end_transaction) break;
478 ME_PlayUndoItem( editor, undo );
479 list_remove( &undo->entry );
480 destroy_undo_item( undo );
482 ME_MoveCursorFromTableRowStartParagraph(editor);
483 add_undo( editor, undo_end_transaction );
484 ME_CheckTablesForCorruption(editor);
485 editor->nUndoMode = nMode;
486 ME_UpdateRepaint(editor, FALSE);