Sweden-Number/dlls/riched20/undo.c

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/*
* RichEdit - functions dealing with editor object
*
* Copyright 2004 by Krzysztof Foltman
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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*/
#include "editor.h"
WINE_DEFAULT_DEBUG_CHANNEL(richedit);
void ME_EmptyUndoStack(ME_TextEditor *editor)
{
ME_DisplayItem *p, *pNext;
if (editor->nUndoMode == umIgnore)
return;
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TRACE("Emptying undo stack\n");
p = editor->pUndoStack;
editor->pUndoStack = editor->pUndoStackBottom = NULL;
editor->nUndoStackSize = 0;
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while(p) {
pNext = p->next;
ME_DestroyDisplayItem(p);
p = pNext;
}
p = editor->pRedoStack;
editor->pRedoStack = NULL;
while(p) {
pNext = p->next;
ME_DestroyDisplayItem(p);
p = pNext;
}
}
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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)
return NULL;
else if (editor->nUndoLimit == 0)
return NULL;
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else
{
ME_DisplayItem *pItem = (ME_DisplayItem *)ALLOC_OBJ(ME_UndoItem);
((ME_UndoItem *)pItem)->nCR = ((ME_UndoItem *)pItem)->nLF = -1;
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switch(type)
{
case diUndoPotentialEndTransaction:
/* only should be added for manually typed chars, not undos or redos */
assert(editor->nUndoMode == umAddToUndo);
/* intentional fall-through to next case */
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case diUndoEndTransaction:
break;
case diUndoSetParagraphFormat:
assert(pdi);
pItem->member.para = pdi->member.para;
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pItem->member.para.pFmt = ALLOC_OBJ(PARAFORMAT2);
*pItem->member.para.pFmt = *pdi->member.para.pFmt;
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break;
case diUndoInsertRun:
assert(pdi);
pItem->member.run = pdi->member.run;
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pItem->member.run.strText = ME_StrDup(pItem->member.run.strText);
ME_AddRefStyle(pItem->member.run.style);
if (pdi->member.run.ole_obj)
{
pItem->member.run.ole_obj = ALLOC_OBJ(*pItem->member.run.ole_obj);
ME_CopyReObject(pItem->member.run.ole_obj, pdi->member.run.ole_obj);
}
else pItem->member.run.ole_obj = NULL;
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break;
case diUndoSetCharFormat:
case diUndoSetDefaultCharFormat:
break;
case diUndoDeleteRun:
case diUndoJoinParagraphs:
break;
case diUndoSplitParagraph:
pItem->member.para.pFmt = ALLOC_OBJ(PARAFORMAT2);
pItem->member.para.pFmt->cbSize = sizeof(PARAFORMAT2);
pItem->member.para.pFmt->dwMask = 0;
break;
default:
assert(0 == "AddUndoItem, unsupported item type");
return NULL;
}
pItem->type = type;
pItem->prev = NULL;
if (editor->nUndoMode == umAddToUndo || editor->nUndoMode == umAddBackToUndo)
{
if (editor->pUndoStack
&& editor->pUndoStack->type == diUndoPotentialEndTransaction)
{
editor->pUndoStack->type = diUndoEndTransaction;
}
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if (editor->nUndoMode == umAddToUndo)
TRACE("Pushing id=%s to undo stack, deleting redo stack\n", ME_GetDITypeName(type));
else
TRACE("Pushing id=%s to undo stack\n", ME_GetDITypeName(type));
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pItem->next = editor->pUndoStack;
if (type == diUndoEndTransaction || type == diUndoPotentialEndTransaction)
editor->nUndoStackSize++;
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if (editor->pUndoStack)
editor->pUndoStack->prev = pItem;
else
editor->pUndoStackBottom = pItem;
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editor->pUndoStack = pItem;
if (editor->nUndoStackSize > editor->nUndoLimit)
{ /* remove oldest undo from stack */
ME_DisplayItem *p = editor->pUndoStackBottom;
while (p->type !=diUndoEndTransaction)
p = p->prev; /*find new stack bottom */
editor->pUndoStackBottom = p->prev;
editor->pUndoStackBottom->next = NULL;
do
{
ME_DisplayItem *pp = p->next;
ME_DestroyDisplayItem(p);
p = pp;
} while (p);
editor->nUndoStackSize--;
}
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/* any new operation (not redo) clears the redo stack */
if (editor->nUndoMode == umAddToUndo) {
ME_DisplayItem *p = editor->pRedoStack;
while(p)
{
ME_DisplayItem *pp = p->next;
ME_DestroyDisplayItem(p);
p = pp;
}
editor->pRedoStack = NULL;
}
}
else if (editor->nUndoMode == umAddToRedo)
{
TRACE("Pushing id=%s to redo stack\n", ME_GetDITypeName(type));
pItem->next = editor->pRedoStack;
if (editor->pRedoStack)
editor->pRedoStack->prev = pItem;
editor->pRedoStack = pItem;
}
else
assert(0);
return (ME_UndoItem *)pItem;
}
}
/**
* Commits preceding changes into a transaction that can be undone together.
*
* This should be called after all the changes occur associated with an event
* so that the group of changes can be undone atomically as a transaction.
*
* This will have no effect the undo mode is set to ignore changes, or if no
* changes preceded calling this function before the last time it was called.
*
* This can also be used to conclude a coalescing transaction (used for grouping
* typed characters).
*/
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void ME_CommitUndo(ME_TextEditor *editor) {
if (editor->nUndoMode == umIgnore)
return;
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assert(editor->nUndoMode == umAddToUndo);
/* no transactions, no need to commit */
if (!editor->pUndoStack)
return;
/* no need to commit empty transactions */
if (editor->pUndoStack->type == diUndoEndTransaction)
return;
if (editor->pUndoStack->type == diUndoPotentialEndTransaction)
{
/* Previous transaction was as a result of characters typed,
* so the end of this transaction is confirmed. */
editor->pUndoStack->type = diUndoEndTransaction;
return;
}
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ME_AddUndoItem(editor, diUndoEndTransaction, NULL);
ME_SendSelChange(editor);
}
/**
* Groups supsequent changes with previous ones for an undo if coalescing.
*
* Has no effect if the previous changes were followed by a ME_CommitUndo. This
* function will only have an affect if the previous changes were followed by
* a call to ME_CommitCoalescingUndo, which allows the transaction to be
* continued.
*
* This allows multiple consecutively typed characters to be grouped together
* to be undone by a single undo operation.
*/
void ME_ContinueCoalescingTransaction(ME_TextEditor *editor)
{
ME_DisplayItem* p;
if (editor->nUndoMode == umIgnore)
return;
assert(editor->nUndoMode == umAddToUndo);
p = editor->pUndoStack;
if (p && p->type == diUndoPotentialEndTransaction) {
assert(p->next); /* EndTransactions shouldn't be at bottom of undo stack */
editor->pUndoStack = p->next;
editor->pUndoStack->prev = NULL;
editor->nUndoStackSize--;
ME_DestroyDisplayItem(p);
}
}
/**
* Commits preceding changes into a undo transaction that can be expanded.
*
* This function allows the transaction to be reopened with
* ME_ContinueCoalescingTransaction in order to continue the transaction. If an
* undo item is added to the undo stack as a result of a change without the
* transaction being reopened, then the transaction will be ended, and the
* changes will become a part of the next transaction.
*
* This is used to allow typed characters to be grouped together since each
* typed character results in a single event, and each event adding undo items
* must be committed. Using this function as opposed to ME_CommitUndo allows
* multiple events to be grouped, and undone together.
*/
void ME_CommitCoalescingUndo(ME_TextEditor *editor)
{
if (editor->nUndoMode == umIgnore)
return;
assert(editor->nUndoMode == umAddToUndo);
/* no transactions, no need to commit */
if (!editor->pUndoStack)
return;
/* no need to commit empty transactions */
if (editor->pUndoStack->type == diUndoEndTransaction)
return;
if (editor->pUndoStack->type == diUndoPotentialEndTransaction)
return;
ME_AddUndoItem(editor, diUndoPotentialEndTransaction, NULL);
ME_SendSelChange(editor);
}
static void ME_PlayUndoItem(ME_TextEditor *editor, ME_DisplayItem *pItem)
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{
ME_UndoItem *pUItem = (ME_UndoItem *)pItem;
if (editor->nUndoMode == umIgnore)
return;
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TRACE("Playing undo/redo item, id=%s\n", ME_GetDITypeName(pItem->type));
switch(pItem->type)
{
case diUndoPotentialEndTransaction:
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case diUndoEndTransaction:
assert(0);
case diUndoSetParagraphFormat:
{
ME_Cursor tmp;
ME_CursorFromCharOfs(editor, pItem->member.para.nCharOfs, &tmp);
ME_SetParaFormat(editor, ME_FindItemBack(tmp.pRun, diParagraph), pItem->member.para.pFmt);
break;
}
case diUndoSetCharFormat:
{
ME_SetCharFormat(editor, pUItem->nStart, pUItem->nLen, &pItem->member.ustyle->fmt);
break;
}
case diUndoSetDefaultCharFormat:
{
ME_SetDefaultCharFormat(editor, &pItem->member.ustyle->fmt);
break;
}
case diUndoInsertRun:
{
ME_InsertRun(editor, pItem->member.run.nCharOfs, pItem);
break;
}
case diUndoDeleteRun:
{
ME_InternalDeleteText(editor, pUItem->nStart, pUItem->nLen);
break;
}
case diUndoJoinParagraphs:
{
ME_Cursor tmp;
ME_CursorFromCharOfs(editor, pUItem->nStart, &tmp);
/* the only thing that's needed is paragraph offset, so no need to split runs */
ME_JoinParagraphs(editor, ME_GetParagraph(tmp.pRun));
break;
}
case diUndoSplitParagraph:
{
ME_Cursor tmp;
ME_DisplayItem *new_para;
ME_CursorFromCharOfs(editor, pUItem->nStart, &tmp);
if (tmp.nOffset)
tmp.pRun = ME_SplitRunSimple(editor, tmp.pRun, tmp.nOffset);
assert(pUItem->nCR >= 0);
assert(pUItem->nLF >= 0);
new_para = ME_SplitParagraph(editor, tmp.pRun, tmp.pRun->member.run.style,
pUItem->nCR, pUItem->nLF);
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assert(pItem->member.para.pFmt->cbSize == sizeof(PARAFORMAT2));
*new_para->member.para.pFmt = *pItem->member.para.pFmt;
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break;
}
default:
assert(0 == "PlayUndoItem, unexpected type");
}
}
BOOL ME_Undo(ME_TextEditor *editor) {
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ME_DisplayItem *p;
ME_UndoMode nMode = editor->nUndoMode;
if (editor->nUndoMode == umIgnore)
return FALSE;
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assert(nMode == umAddToUndo || nMode == umIgnore);
/* no undo items ? */
if (!editor->pUndoStack)
return FALSE;
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/* watch out for uncommitted transactions ! */
assert(editor->pUndoStack->type == diUndoEndTransaction
|| editor->pUndoStack->type == diUndoPotentialEndTransaction);
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editor->nUndoMode = umAddToRedo;
p = editor->pUndoStack->next;
ME_DestroyDisplayItem(editor->pUndoStack);
editor->pUndoStack = p;
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do {
p->prev = NULL;
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ME_PlayUndoItem(editor, p);
editor->pUndoStack = p->next;
ME_DestroyDisplayItem(p);
p = editor->pUndoStack;
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} while(p && p->type != diUndoEndTransaction);
if (p)
p->prev = NULL;
ME_AddUndoItem(editor, diUndoEndTransaction, NULL);
editor->nUndoStackSize--;
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editor->nUndoMode = nMode;
ME_UpdateRepaint(editor);
return TRUE;
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}
BOOL ME_Redo(ME_TextEditor *editor) {
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ME_DisplayItem *p;
ME_UndoMode nMode = editor->nUndoMode;
assert(nMode == umAddToUndo || nMode == umIgnore);
if (editor->nUndoMode == umIgnore)
return FALSE;
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/* no redo items ? */
if (!editor->pRedoStack)
return FALSE;
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/* watch out for uncommitted transactions ! */
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assert(editor->pRedoStack->type == diUndoEndTransaction);
editor->nUndoMode = umAddBackToUndo;
p = editor->pRedoStack->next;
ME_DestroyDisplayItem(editor->pRedoStack);
editor->pRedoStack = p;
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do {
p->prev = NULL;
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ME_PlayUndoItem(editor, p);
editor->pRedoStack = p->next;
ME_DestroyDisplayItem(p);
p = editor->pRedoStack;
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} while(p && p->type != diUndoEndTransaction);
if (p)
p->prev = NULL;
ME_AddUndoItem(editor, diUndoEndTransaction, NULL);
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editor->nUndoMode = nMode;
ME_UpdateRepaint(editor);
return TRUE;
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}