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, ME_DisplayItem *pdi) {
52 if (editor->nUndoMode == umIgnore)
54 else if (editor->nUndoLimit == 0)
58 ME_DisplayItem *pItem = (ME_DisplayItem *)ALLOC_OBJ(ME_UndoItem);
61 case diUndoEndTransaction:
63 case diUndoSetParagraphFormat:
65 CopyMemory(&pItem->member.para, &pdi->member.para, sizeof(ME_Paragraph));
66 pItem->member.para.pFmt = ALLOC_OBJ(PARAFORMAT2);
67 CopyMemory(pItem->member.para.pFmt, pdi->member.para.pFmt, sizeof(PARAFORMAT2));
71 CopyMemory(&pItem->member.run, &pdi->member.run, sizeof(ME_Run));
72 pItem->member.run.strText = ME_StrDup(pItem->member.run.strText);
73 ME_AddRefStyle(pItem->member.run.style);
75 case diUndoSetCharFormat:
76 case diUndoSetDefaultCharFormat:
79 case diUndoJoinParagraphs:
81 case diUndoSplitParagraph:
82 pItem->member.para.pFmt = ALLOC_OBJ(PARAFORMAT2);
83 pItem->member.para.pFmt->cbSize = sizeof(PARAFORMAT2);
84 pItem->member.para.pFmt->dwMask = 0;
88 assert(0 == "AddUndoItem, unsupported item type");
93 if (editor->nUndoMode == umAddToUndo || editor->nUndoMode == umAddBackToUndo)
95 if (editor->nUndoMode == umAddToUndo)
96 TRACE("Pushing id=%s to undo stack, deleting redo stack\n", ME_GetDITypeName(type));
98 TRACE("Pushing id=%s to undo stack\n", ME_GetDITypeName(type));
100 pItem->next = editor->pUndoStack;
101 if (type == diUndoEndTransaction)
102 editor->nUndoStackSize++;
103 if (editor->pUndoStack)
104 editor->pUndoStack->prev = pItem;
106 editor->pUndoStackBottom = pItem;
107 editor->pUndoStack = pItem;
109 if (editor->nUndoStackSize > editor->nUndoLimit)
110 { /* remove oldest undo from stack */
111 ME_DisplayItem *p = editor->pUndoStackBottom;
112 while (p->type !=diUndoEndTransaction)
113 p = p->prev; /*find new stack bottom */
114 editor->pUndoStackBottom = p->prev;
115 editor->pUndoStackBottom->next = NULL;
118 ME_DisplayItem *pp = p->next;
119 ME_DestroyDisplayItem(p);
122 editor->nUndoStackSize--;
124 /* any new operation (not redo) clears the redo stack */
125 if (editor->nUndoMode == umAddToUndo) {
126 ME_DisplayItem *p = editor->pRedoStack;
129 ME_DisplayItem *pp = p->next;
130 ME_DestroyDisplayItem(p);
133 editor->pRedoStack = NULL;
136 else if (editor->nUndoMode == umAddToRedo)
138 TRACE("Pushing id=%s to redo stack\n", ME_GetDITypeName(type));
139 pItem->next = editor->pRedoStack;
140 if (editor->pRedoStack)
141 editor->pRedoStack->prev = pItem;
142 editor->pRedoStack = pItem;
146 return (ME_UndoItem *)pItem;
150 void ME_CommitUndo(ME_TextEditor *editor) {
152 if (editor->nUndoMode == umIgnore)
155 assert(editor->nUndoMode == umAddToUndo);
157 /* no transactions, no need to commit */
158 if (!editor->pUndoStack)
161 /* no need to commit empty transactions */
162 if (editor->pUndoStack->type == diUndoEndTransaction)
165 ME_AddUndoItem(editor, diUndoEndTransaction, NULL);
166 ME_SendSelChange(editor);
167 editor->nModifyStep++;
170 void ME_PlayUndoItem(ME_TextEditor *editor, ME_DisplayItem *pItem)
172 ME_UndoItem *pUItem = (ME_UndoItem *)pItem;
174 if (editor->nUndoMode == umIgnore)
176 TRACE("Playing undo/redo item, id=%s\n", ME_GetDITypeName(pItem->type));
180 case diUndoEndTransaction:
182 case diUndoSetParagraphFormat:
185 ME_CursorFromCharOfs(editor, pItem->member.para.nCharOfs, &tmp);
186 ME_SetParaFormat(editor, ME_FindItemBack(tmp.pRun, diParagraph), pItem->member.para.pFmt);
189 case diUndoSetCharFormat:
191 ME_SetCharFormat(editor, pUItem->nStart, pUItem->nLen, &pItem->member.ustyle->fmt);
194 case diUndoSetDefaultCharFormat:
196 ME_SetDefaultCharFormat(editor, &pItem->member.ustyle->fmt);
199 case diUndoInsertRun:
201 ME_InsertRun(editor, pItem->member.run.nCharOfs, pItem);
204 case diUndoDeleteRun:
206 ME_InternalDeleteText(editor, pUItem->nStart, pUItem->nLen);
209 case diUndoJoinParagraphs:
212 ME_CursorFromCharOfs(editor, pUItem->nStart, &tmp);
213 /* the only thing that's needed is paragraph offset, so no need to split runs */
214 ME_JoinParagraphs(editor, ME_GetParagraph(tmp.pRun));
217 case diUndoSplitParagraph:
220 ME_DisplayItem *new_para;
221 ME_CursorFromCharOfs(editor, pUItem->nStart, &tmp);
223 tmp.pRun = ME_SplitRunSimple(editor, tmp.pRun, tmp.nOffset);
224 new_para = ME_SplitParagraph(editor, tmp.pRun, tmp.pRun->member.run.style);
225 assert(pItem->member.para.pFmt->cbSize == sizeof(PARAFORMAT2));
226 CopyMemory(new_para->member.para.pFmt, pItem->member.para.pFmt, sizeof(PARAFORMAT2));
230 assert(0 == "PlayUndoItem, unexpected type");
234 void ME_Undo(ME_TextEditor *editor) {
236 ME_UndoMode nMode = editor->nUndoMode;
238 if (editor->nUndoMode == umIgnore)
240 assert(nMode == umAddToUndo || nMode == umIgnore);
242 /* no undo items ? */
243 if (!editor->pUndoStack)
246 /* watch out for uncommited transactions ! */
247 assert(editor->pUndoStack->type == diUndoEndTransaction);
249 editor->nUndoMode = umAddToRedo;
250 p = editor->pUndoStack->next;
251 ME_DestroyDisplayItem(editor->pUndoStack);
253 ME_DisplayItem *pp = p;
254 ME_PlayUndoItem(editor, p);
256 ME_DestroyDisplayItem(pp);
257 } while(p && p->type != diUndoEndTransaction);
258 ME_AddUndoItem(editor, diUndoEndTransaction, NULL);
259 editor->pUndoStack = p;
260 editor->nUndoStackSize--;
263 editor->nUndoMode = nMode;
264 editor->nModifyStep--;
265 ME_UpdateRepaint(editor);
268 void ME_Redo(ME_TextEditor *editor) {
270 ME_UndoMode nMode = editor->nUndoMode;
272 assert(nMode == umAddToUndo || nMode == umIgnore);
274 if (editor->nUndoMode == umIgnore)
276 /* no redo items ? */
277 if (!editor->pRedoStack)
280 /* watch out for uncommited transactions ! */
281 assert(editor->pRedoStack->type == diUndoEndTransaction);
283 editor->nUndoMode = umAddBackToUndo;
284 p = editor->pRedoStack->next;
285 ME_DestroyDisplayItem(editor->pRedoStack);
287 ME_DisplayItem *pp = p;
288 ME_PlayUndoItem(editor, p);
290 ME_DestroyDisplayItem(pp);
291 } while(p && p->type != diUndoEndTransaction);
292 ME_AddUndoItem(editor, diUndoEndTransaction, NULL);
293 editor->pRedoStack = p;
296 editor->nUndoMode = nMode;
297 editor->nModifyStep++;
298 ME_UpdateRepaint(editor);