296 lines
8.3 KiB
C
296 lines
8.3 KiB
C
/*
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* RichEdit - functions dealing with editor object
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*
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* Copyright 2004 by Krzysztof Foltman
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#include "editor.h"
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WINE_DEFAULT_DEBUG_CHANNEL(richedit);
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void ME_EmptyUndoStack(ME_TextEditor *editor)
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{
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ME_DisplayItem *p, *pNext;
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if (editor->nUndoMode == umIgnore)
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return;
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TRACE("Emptying undo stack\n");
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p = editor->pUndoStack;
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editor->pUndoStack = editor->pUndoStackBottom = NULL;
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editor->nUndoStackSize = 0;
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while(p) {
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pNext = p->next;
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ME_DestroyDisplayItem(p);
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p = pNext;
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}
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p = editor->pRedoStack;
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editor->pRedoStack = NULL;
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while(p) {
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pNext = p->next;
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ME_DestroyDisplayItem(p);
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p = pNext;
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}
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}
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ME_UndoItem *ME_AddUndoItem(ME_TextEditor *editor, ME_DIType type, const ME_DisplayItem *pdi) {
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if (editor->nUndoMode == umIgnore)
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return NULL;
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else if (editor->nUndoLimit == 0)
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return NULL;
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else
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{
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ME_DisplayItem *pItem = (ME_DisplayItem *)ALLOC_OBJ(ME_UndoItem);
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switch(type)
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{
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case diUndoEndTransaction:
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break;
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case diUndoSetParagraphFormat:
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assert(pdi);
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CopyMemory(&pItem->member.para, &pdi->member.para, sizeof(ME_Paragraph));
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pItem->member.para.pFmt = ALLOC_OBJ(PARAFORMAT2);
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CopyMemory(pItem->member.para.pFmt, pdi->member.para.pFmt, sizeof(PARAFORMAT2));
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break;
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case diUndoInsertRun:
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assert(pdi);
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CopyMemory(&pItem->member.run, &pdi->member.run, sizeof(ME_Run));
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pItem->member.run.strText = ME_StrDup(pItem->member.run.strText);
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ME_AddRefStyle(pItem->member.run.style);
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break;
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case diUndoSetCharFormat:
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case diUndoSetDefaultCharFormat:
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break;
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case diUndoDeleteRun:
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case diUndoJoinParagraphs:
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break;
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case diUndoSplitParagraph:
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pItem->member.para.pFmt = ALLOC_OBJ(PARAFORMAT2);
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pItem->member.para.pFmt->cbSize = sizeof(PARAFORMAT2);
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pItem->member.para.pFmt->dwMask = 0;
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break;
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default:
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assert(0 == "AddUndoItem, unsupported item type");
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return NULL;
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}
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pItem->type = type;
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pItem->prev = NULL;
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if (editor->nUndoMode == umAddToUndo || editor->nUndoMode == umAddBackToUndo)
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{
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if (editor->nUndoMode == umAddToUndo)
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TRACE("Pushing id=%s to undo stack, deleting redo stack\n", ME_GetDITypeName(type));
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else
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TRACE("Pushing id=%s to undo stack\n", ME_GetDITypeName(type));
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pItem->next = editor->pUndoStack;
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if (type == diUndoEndTransaction)
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editor->nUndoStackSize++;
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if (editor->pUndoStack)
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editor->pUndoStack->prev = pItem;
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else
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editor->pUndoStackBottom = pItem;
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editor->pUndoStack = pItem;
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if (editor->nUndoStackSize > editor->nUndoLimit)
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{ /* remove oldest undo from stack */
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ME_DisplayItem *p = editor->pUndoStackBottom;
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while (p->type !=diUndoEndTransaction)
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p = p->prev; /*find new stack bottom */
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editor->pUndoStackBottom = p->prev;
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editor->pUndoStackBottom->next = NULL;
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do
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{
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ME_DisplayItem *pp = p->next;
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ME_DestroyDisplayItem(p);
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p = pp;
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} while (p);
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editor->nUndoStackSize--;
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}
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/* any new operation (not redo) clears the redo stack */
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if (editor->nUndoMode == umAddToUndo) {
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ME_DisplayItem *p = editor->pRedoStack;
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while(p)
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{
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ME_DisplayItem *pp = p->next;
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ME_DestroyDisplayItem(p);
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p = pp;
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}
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editor->pRedoStack = NULL;
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}
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}
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else if (editor->nUndoMode == umAddToRedo)
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{
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TRACE("Pushing id=%s to redo stack\n", ME_GetDITypeName(type));
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pItem->next = editor->pRedoStack;
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if (editor->pRedoStack)
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editor->pRedoStack->prev = pItem;
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editor->pRedoStack = pItem;
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}
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else
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assert(0);
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return (ME_UndoItem *)pItem;
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}
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}
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void ME_CommitUndo(ME_TextEditor *editor) {
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if (editor->nUndoMode == umIgnore)
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return;
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assert(editor->nUndoMode == umAddToUndo);
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/* no transactions, no need to commit */
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if (!editor->pUndoStack)
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return;
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/* no need to commit empty transactions */
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if (editor->pUndoStack->type == diUndoEndTransaction)
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return;
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ME_AddUndoItem(editor, diUndoEndTransaction, NULL);
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ME_SendSelChange(editor);
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}
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static void ME_PlayUndoItem(ME_TextEditor *editor, ME_DisplayItem *pItem)
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{
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ME_UndoItem *pUItem = (ME_UndoItem *)pItem;
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if (editor->nUndoMode == umIgnore)
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return;
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TRACE("Playing undo/redo item, id=%s\n", ME_GetDITypeName(pItem->type));
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switch(pItem->type)
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{
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case diUndoEndTransaction:
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assert(0);
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case diUndoSetParagraphFormat:
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{
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ME_Cursor tmp;
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ME_CursorFromCharOfs(editor, pItem->member.para.nCharOfs, &tmp);
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ME_SetParaFormat(editor, ME_FindItemBack(tmp.pRun, diParagraph), pItem->member.para.pFmt);
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break;
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}
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case diUndoSetCharFormat:
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{
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ME_SetCharFormat(editor, pUItem->nStart, pUItem->nLen, &pItem->member.ustyle->fmt);
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break;
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}
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case diUndoSetDefaultCharFormat:
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{
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ME_SetDefaultCharFormat(editor, &pItem->member.ustyle->fmt);
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break;
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}
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case diUndoInsertRun:
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{
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ME_InsertRun(editor, pItem->member.run.nCharOfs, pItem);
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break;
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}
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case diUndoDeleteRun:
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{
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ME_InternalDeleteText(editor, pUItem->nStart, pUItem->nLen);
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break;
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}
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case diUndoJoinParagraphs:
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{
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ME_Cursor tmp;
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ME_CursorFromCharOfs(editor, pUItem->nStart, &tmp);
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/* the only thing that's needed is paragraph offset, so no need to split runs */
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ME_JoinParagraphs(editor, ME_GetParagraph(tmp.pRun));
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break;
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}
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case diUndoSplitParagraph:
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{
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ME_Cursor tmp;
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ME_DisplayItem *new_para;
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ME_CursorFromCharOfs(editor, pUItem->nStart, &tmp);
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if (tmp.nOffset)
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tmp.pRun = ME_SplitRunSimple(editor, tmp.pRun, tmp.nOffset);
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new_para = ME_SplitParagraph(editor, tmp.pRun, tmp.pRun->member.run.style);
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assert(pItem->member.para.pFmt->cbSize == sizeof(PARAFORMAT2));
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CopyMemory(new_para->member.para.pFmt, pItem->member.para.pFmt, sizeof(PARAFORMAT2));
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break;
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}
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default:
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assert(0 == "PlayUndoItem, unexpected type");
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}
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}
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void ME_Undo(ME_TextEditor *editor) {
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ME_DisplayItem *p;
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ME_UndoMode nMode = editor->nUndoMode;
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if (editor->nUndoMode == umIgnore)
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return;
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assert(nMode == umAddToUndo || nMode == umIgnore);
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/* no undo items ? */
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if (!editor->pUndoStack)
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return;
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/* watch out for uncommited transactions ! */
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assert(editor->pUndoStack->type == diUndoEndTransaction);
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editor->nUndoMode = umAddToRedo;
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p = editor->pUndoStack->next;
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ME_DestroyDisplayItem(editor->pUndoStack);
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do {
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ME_DisplayItem *pp = p;
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ME_PlayUndoItem(editor, p);
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p = p->next;
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ME_DestroyDisplayItem(pp);
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} while(p && p->type != diUndoEndTransaction);
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ME_AddUndoItem(editor, diUndoEndTransaction, NULL);
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editor->pUndoStack = p;
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editor->nUndoStackSize--;
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if (p)
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p->prev = NULL;
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editor->nUndoMode = nMode;
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ME_UpdateRepaint(editor);
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}
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void ME_Redo(ME_TextEditor *editor) {
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ME_DisplayItem *p;
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ME_UndoMode nMode = editor->nUndoMode;
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assert(nMode == umAddToUndo || nMode == umIgnore);
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if (editor->nUndoMode == umIgnore)
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return;
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/* no redo items ? */
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if (!editor->pRedoStack)
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return;
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/* watch out for uncommited transactions ! */
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assert(editor->pRedoStack->type == diUndoEndTransaction);
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editor->nUndoMode = umAddBackToUndo;
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p = editor->pRedoStack->next;
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ME_DestroyDisplayItem(editor->pRedoStack);
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do {
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ME_DisplayItem *pp = p;
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ME_PlayUndoItem(editor, p);
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p = p->next;
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ME_DestroyDisplayItem(pp);
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} while(p && p->type != diUndoEndTransaction);
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ME_AddUndoItem(editor, diUndoEndTransaction, NULL);
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editor->pRedoStack = p;
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if (p)
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p->prev = NULL;
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editor->nUndoMode = nMode;
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ME_UpdateRepaint(editor);
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}
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