lyx_mirror/src/undo_funcs.C

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/* This file is part of
* ======================================================
*
* LyX, The Document Processor
*
* Copyright 1995-2001 The LyX Team.
*
* ====================================================== */
#include <config.h>
#ifdef __GNUG__
#pragma implementation
#endif
#include "undo_funcs.h"
#include "lyxtext.h"
#include "BufferView.h"
#include "buffer.h"
#include "insets/inset.h"
#include "debug.h"
#include "support/LAssert.h"
#include "iterators.h"
#define DELETE_UNUSED_PARAGRAPHS 1
#ifdef DELETE_UNUSED_PARAGRAPHS
#include <vector>
#endif
using std::vector;
/// the flag used by FinishUndo();
bool undo_finished;
/// a flag
bool undo_frozen;
bool textUndo(BufferView * bv)
{
// returns false if no undo possible
Undo * undo = bv->buffer()->undostack.top();
bv->buffer()->undostack.pop();
if (undo) {
finishUndo();
if (!undo_frozen) {
Paragraph * first = bv->buffer()->getParFromID(undo->number_of_before_par);
if (first && first->next())
first = first->next();
else if (!first)
first = firstUndoParagraph(bv, undo->number_of_inset_id);
if (first) {
bv->buffer()->redostack.push(
createUndo(bv, undo->kind, first,
bv->buffer()->getParFromID(undo->number_of_behind_par)));
}
}
}
// now we can unlock the inset for saftey because the inset pointer could
// be changed during the undo-function. Anyway if needed we have to lock
// the right inset/position if this is requested.
freezeUndo();
bv->unlockInset(bv->theLockingInset());
bool ret = textHandleUndo(bv, undo);
unFreezeUndo();
return ret;
}
bool textRedo(BufferView * bv)
{
// returns false if no redo possible
Undo * undo = bv->buffer()->redostack.top();
bv->buffer()->redostack.pop();
if (undo) {
finishUndo();
if (!undo_frozen) {
Paragraph * first = bv->buffer()->getParFromID(undo->number_of_before_par);
if (first && first->next())
first = first->next();
else if (!first)
first = firstUndoParagraph(bv, undo->number_of_inset_id);
if (first) {
bv->buffer()->undostack.push(
createUndo(bv, undo->kind, first,
bv->buffer()->getParFromID(undo->number_of_behind_par)));
}
}
}
// now we can unlock the inset for saftey because the inset pointer could
// be changed during the undo-function. Anyway if needed we have to lock
// the right inset/position if this is requested.
freezeUndo();
bv->unlockInset(bv->theLockingInset());
bool ret = textHandleUndo(bv, undo);
unFreezeUndo();
return ret;
}
bool textHandleUndo(BufferView * bv, Undo * undo)
{
// returns false if no undo possible
bool result = false;
if (undo) {
Paragraph * before =
bv->buffer()->getParFromID(undo->number_of_before_par);
Paragraph * behind =
bv->buffer()->getParFromID(undo->number_of_behind_par);
Paragraph * tmppar;
Paragraph * tmppar2;
Paragraph * tmppar5;
// if there's no before take the beginning
// of the document for redoing
if (!before) {
LyXText * t = bv->text;
int num = undo->number_of_inset_id;
if (undo->number_of_inset_id >= 0) {
Inset * in = bv->buffer()->getInsetFromID(num);
if (in) {
t = in->getLyXText(bv);
} else {
num = -1;
}
}
t->setCursorIntern(bv, firstUndoParagraph(bv, num), 0);
}
// replace the paragraphs with the undo informations
Paragraph * tmppar3 = undo->par;
undo->par = 0; /* otherwise the undo destructor would
delete the paragraph */
// get last undo par and set the right(new) inset-owner of the
// paragraph if there is any. This is not needed if we don't have
// a paragraph before because then in is automatically done in the
// function which assigns the first paragraph to an InsetText. (Jug)
Paragraph * tmppar4 = tmppar3;
if (tmppar4) {
Inset * in = 0;
if (before)
in = before->inInset();
else if (undo->number_of_inset_id >= 0)
in = bv->buffer()->getInsetFromID(undo->number_of_inset_id);
tmppar4->setInsetOwner(in);
while (tmppar4->next()) {
tmppar4 = tmppar4->next();
tmppar4->setInsetOwner(in);
}
}
// now remove the old text if there is any
#ifdef DELETE_UNUSED_PARAGRAPHS
vector<Paragraph *> vvpar;
#endif
if (before != behind || (!behind && !before)) {
if (before)
tmppar5 = before->next();
else
tmppar5 = firstUndoParagraph(bv, undo->number_of_inset_id);
tmppar2 = tmppar3;
while (tmppar5 && tmppar5 != behind) {
#ifdef DELETE_UNUSED_PARAGRAPHS
vvpar.push_back(tmppar5);
#endif
tmppar = tmppar5;
tmppar5 = tmppar5->next();
// a memory optimization for edit:
// Only layout information
// is stored in the undo. So restore
// the text informations.
if (undo->kind == Undo::EDIT) {
tmppar2->setContentsFromPar(tmppar);
#ifndef DELETE_UNUSED_PARAGRAPHS
tmppar->clearContents();
#endif
tmppar2 = tmppar2->next();
}
}
}
// put the new stuff in the list if there is one
if (tmppar3) {
if (before)
before->next(tmppar3);
else
bv->text->ownerParagraph(firstUndoParagraph(bv, undo->number_of_inset_id)->id(),
tmppar3);
tmppar3->previous(before);
} else {
// We enter here on DELETE undo operations where we have to
// substitue the second paragraph with the first if the removed
// one is the first!
if (!before && behind) {
bv->text->ownerParagraph(firstUndoParagraph(bv, undo->number_of_inset_id)->id(),
behind);
tmppar3 = behind;
}
}
if (tmppar4) {
tmppar4->next(behind);
if (behind)
behind->previous(tmppar4);
}
// Set the cursor for redoing
if (before) {
Inset * it = before->inInset();
if (it)
it->getLyXText(bv)->setCursorIntern(bv, before, 0);
else
bv->text->setCursorIntern(bv, before, 0);
}
Paragraph * endpar = 0;
// calculate the endpar for redoing the paragraphs.
if (behind)
endpar = behind->next();
tmppar = bv->buffer()->getParFromID(undo->number_of_cursor_par);
UpdatableInset* it = 0;
if (tmppar3)
it = static_cast<UpdatableInset*>(tmppar3->inInset());
if (it) {
it->getLyXText(bv)->redoParagraphs(bv,
it->getLyXText(bv)->cursor,
endpar);
if (tmppar) {
it = static_cast<UpdatableInset*>(tmppar->inInset());
LyXText * t;
if (it) {
it->edit(bv);
t = it->getLyXText(bv);
} else {
t = bv->text;
}
t->setCursorIntern(bv, tmppar, undo->cursor_pos);
t->updateCounters(bv, t->cursor.row());
bv->fitCursor();
}
bv->updateInset(it, false);
bv->text->setCursorIntern(bv, bv->text->cursor.par(),
bv->text->cursor.pos());
} else {
bv->text->redoParagraphs(bv, bv->text->cursor, endpar);
if (tmppar) {
LyXText * t;
Inset * it = tmppar->inInset();
if (it) {
it->edit(bv);
t = it->getLyXText(bv);
} else {
t = bv->text;
}
t->setCursorIntern(bv, tmppar, undo->cursor_pos);
t->updateCounters(bv, t->cursor.row());
}
}
result = true;
delete undo;
#ifdef DELETE_UNUSED_PARAGRAPHS
// And here it's save enough to delete all removed paragraphs
vector<Paragraph *>::iterator pit = vvpar.begin();
if (pit != vvpar.end()) {
#if 0
lyxerr << endl << "PARS BEFORE:";
ParIterator end = bv->buffer()->par_iterator_end();
ParIterator it = bv->buffer()->par_iterator_begin();
for (; it != end; ++it)
lyxerr << (*it)->previous() << "<- " << (*it) << " ->" << (*it)->next() << endl;
lyxerr << "DEL: ";
#endif
for(;pit != vvpar.end(); ++pit) {
// lyxerr << *pit << " ";
(*pit)->previous(0);
(*pit)->next(0);
delete (*pit);
}
#if 0
lyxerr << endl << "PARS AFTER:";
end = bv->buffer()->par_iterator_end();
it = bv->buffer()->par_iterator_begin();
for (; it != end; ++it)
lyxerr << (*it)->previous() << "<- " << (*it) << " ->" << (*it)->next() << endl;
#endif
}
#endif
}
finishUndo();
bv->text->status(bv, LyXText::NEED_MORE_REFRESH);
return result;
}
void finishUndo()
{
// makes sure the next operation will be stored
undo_finished = true;
}
void freezeUndo()
{
// this is dangerous and for internal use only
undo_frozen = true;
}
void unFreezeUndo()
{
// this is dangerous and for internal use only
undo_frozen = false;
}
void setUndo(BufferView * bv, Undo::undo_kind kind,
Paragraph const * first, Paragraph const * behind)
{
if (!undo_frozen) {
bv->buffer()->undostack.push(createUndo(bv, kind, first, behind));
bv->buffer()->redostack.clear();
}
}
void setRedo(BufferView * bv, Undo::undo_kind kind,
Paragraph const * first, Paragraph const * behind)
{
bv->buffer()->redostack.push(createUndo(bv, kind, first, behind));
}
Undo * createUndo(BufferView * bv, Undo::undo_kind kind,
Paragraph const * first, Paragraph const * behind)
{
lyx::Assert(first);
int before_number = -1;
int behind_number = -1;
int inset_id = -1;
if (first->previous())
before_number = first->previous()->id();
if (behind)
behind_number = behind->id();
if (first->inInset())
inset_id = first->inInset()->id();
// Undo::EDIT and Undo::FINISH are
// always finished. (no overlapping there)
// overlapping only with insert and delete inside one paragraph:
// Nobody wants all removed character
// appear one by one when undoing.
// EDIT is special since only layout information, not the
// contents of a paragaph are stored.
if (!undo_finished && (kind != Undo::EDIT) && (kind != Undo::FINISH)) {
// check wether storing is needed
if (!bv->buffer()->undostack.empty() &&
bv->buffer()->undostack.top()->kind == kind &&
bv->buffer()->undostack.top()->number_of_before_par == before_number &&
bv->buffer()->undostack.top()->number_of_behind_par == behind_number) {
// no undo needed
return 0;
}
}
// create a new Undo
Paragraph * undopar;
Paragraph * start = const_cast<Paragraph *>(first);
Paragraph * end = 0;
if (behind)
end = const_cast<Paragraph*>(behind->previous());
else {
end = start;
while (end->next())
end = end->next();
}
if (start && end && (start != end->next()) &&
((before_number != behind_number) ||
((before_number < 0) && (behind_number < 0))))
{
Paragraph * tmppar = start;
Paragraph * tmppar2 = new Paragraph(*tmppar, true);
// a memory optimization: Just store the layout information
// when only edit
if (kind == Undo::EDIT) {
tmppar2->clearContents();
}
undopar = tmppar2;
while (tmppar != end && tmppar->next()) {
tmppar = tmppar->next();
#if 0
tmppar2->next(new Paragraph(*tmppar, true));
#else
Paragraph * ptmp = new Paragraph(*tmppar, true);
tmppar2->next(ptmp);
#endif
// a memory optimization: Just store the layout
// information when only edit
if (kind == Undo::EDIT) {
tmppar2->clearContents();
}
tmppar2->next()->previous(tmppar2);
tmppar2 = tmppar2->next();
}
tmppar2->next(0);
} else
undopar = 0; // nothing to replace (undo of delete maybe)
int cursor_par = undoCursor(bv).par()->id();
int cursor_pos = undoCursor(bv).pos();
Undo * undo = new Undo(kind, inset_id,
before_number, behind_number,
cursor_par, cursor_pos, undopar);
undo_finished = false;
return undo;
}
void setCursorParUndo(BufferView * bv)
{
setUndo(bv, Undo::FINISH, bv->text->cursor.par(),
bv->text->cursor.par()->next());
}
Paragraph * firstUndoParagraph(BufferView * bv, int inset_id)
{
Inset * inset = bv->buffer()->getInsetFromID(inset_id);
if (inset) {
Paragraph * result = inset->getFirstParagraph(0);
if (result)
return result;
}
return bv->text->ownerParagraph();
}
LyXCursor const & undoCursor(BufferView * bv)
{
if (bv->theLockingInset())
return bv->theLockingInset()->cursor(bv);
return bv->text->cursor;
}