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https://git.lyx.org/repos/lyx.git
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271f8d7eec
git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@2713 a592a061-630c-0410-9148-cb99ea01b6c8
349 lines
8.7 KiB
C
349 lines
8.7 KiB
C
/* This file is part of
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* ======================================================
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*
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* LyX, The Document Processor
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*
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* Copyright 1995-2001 The LyX Team.
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*
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* ====================================================== */
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#include <config.h>
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#ifdef __GNUG__
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#pragma implementation
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#endif
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#include "undo_funcs.h"
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#include "lyxtext.h"
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#include "BufferView.h"
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#include "buffer.h"
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#include "insets/inset.h"
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#include "debug.h"
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#include "support/LAssert.h"
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/// the flag used by FinishUndo();
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bool undo_finished;
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/// a flag
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bool undo_frozen;
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bool textUndo(BufferView * bv)
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{
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// returns false if no undo possible
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Undo * undo = bv->buffer()->undostack.pop();
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if (undo) {
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finishUndo();
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if (!undo_frozen) {
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Paragraph * first = bv->buffer()->getParFromID(undo->number_of_before_par);
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if (!first)
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first = firstUndoParagraph(bv, undo->number_of_inset_id);
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if (first) {
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bv->buffer()->redostack.push(
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createUndo(bv, undo->kind, first,
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bv->buffer()->getParFromID(undo->number_of_behind_par)));
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}
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}
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}
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return textHandleUndo(bv, undo);
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}
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bool textRedo(BufferView * bv)
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{
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// returns false if no redo possible
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Undo * undo = bv->buffer()->redostack.pop();
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if (undo) {
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finishUndo();
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if (!undo_frozen) {
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Paragraph * first = bv->buffer()->getParFromID(undo->number_of_before_par);
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if (!first)
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first = firstUndoParagraph(bv, undo->number_of_inset_id);
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if (first) {
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bv->buffer()->undostack.push(
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createUndo(bv, undo->kind, first,
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bv->buffer()->getParFromID(undo->number_of_behind_par)));
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}
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}
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}
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return textHandleUndo(bv, undo);
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}
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bool textHandleUndo(BufferView * bv, Undo * undo)
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{
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// returns false if no undo possible
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bool result = false;
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if (undo) {
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Paragraph * before =
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bv->buffer()->getParFromID(undo->number_of_before_par);
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Paragraph * behind =
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bv->buffer()->getParFromID(undo->number_of_behind_par);
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Paragraph * tmppar;
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Paragraph * tmppar2;
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Paragraph * endpar;
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Paragraph * tmppar5;
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// if there's no before take the beginning
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// of the document for redoing
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if (!before) {
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LyXText * t = bv->text;
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int num = undo->number_of_inset_id;
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if (undo->number_of_inset_id >= 0) {
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Inset * in = bv->buffer()->getInsetFromID(num);
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if (in) {
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t = in->getLyXText(bv);
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} else {
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num = -1;
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}
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}
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t->setCursorIntern(bv, firstUndoParagraph(bv, num), 0);
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}
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// replace the paragraphs with the undo informations
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Paragraph * tmppar3 = undo->par;
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undo->par = 0; // otherwise the undo destructor would delete the paragraph
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Paragraph * tmppar4 = tmppar3;
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if (tmppar4) {
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while (tmppar4->next())
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tmppar4 = tmppar4->next();
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} // get last undo par
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// now remove the old text if there is any
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if (before != behind || (!behind && !before)) {
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if (before)
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tmppar5 = before->next();
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else
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tmppar5 = firstUndoParagraph(bv, undo->number_of_inset_id);
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tmppar2 = tmppar3;
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while (tmppar5 && tmppar5 != behind) {
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tmppar = tmppar5;
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tmppar5 = tmppar5->next();
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// a memory optimization for edit: Only layout information
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// is stored in the undo. So restore the text informations.
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if (undo->kind == Undo::EDIT) {
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tmppar2->setContentsFromPar(tmppar);
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tmppar->clearContents();
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tmppar2 = tmppar2->next();
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}
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}
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}
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// put the new stuff in the list if there is one
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if (tmppar3){
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if (before)
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before->next(tmppar3);
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else
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bv->text->ownerParagraph(tmppar3->id(), tmppar3);
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tmppar3->previous(before);
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} else {
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// Do we really enter here ??? (Jug)
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if (!before)
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bv->text->ownerParagraph(behind);
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}
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if (tmppar4) {
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tmppar4->next(behind);
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if (behind)
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behind->previous(tmppar4);
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}
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// Set the cursor for redoing
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if (before) {
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bv->text->setCursorIntern(bv, before, 0);
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}
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// calculate the endpar for redoing the paragraphs.
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if (behind) {
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endpar = behind->next();
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} else
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endpar = behind;
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tmppar = bv->buffer()->getParFromID(undo->number_of_cursor_par);
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UpdatableInset* it = static_cast<UpdatableInset*>(tmppar3->inInset());
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if (it) {
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it->getLyXText(bv)->redoParagraphs(bv, it->getLyXText(bv)->cursor,
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endpar);
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if (tmppar){
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it->getLyXText(bv)->setCursorIntern(bv, tmppar, undo->cursor_pos);
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it->getLyXText(bv)->updateCounters(bv, it->getLyXText(bv)->cursor.row());
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}
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#ifdef THIS_DOES_NOT_WORK
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// we need this anyway as also if the undo was inside an inset
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// we have to redo the paragraph breaking
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bv->text->redoParagraphs(bv, bv->text->cursor,
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bv->text->cursor.par());
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#endif
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} else {
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bv->text->redoParagraphs(bv, bv->text->cursor, endpar);
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if (tmppar) {
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bv->text->setCursorIntern(bv, tmppar, undo->cursor_pos);
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bv->text->updateCounters(bv, bv->text->cursor.row());
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}
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}
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result = true;
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delete undo;
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}
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finishUndo();
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bv->text->status(bv, LyXText::NEED_MORE_REFRESH);
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return result;
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}
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void finishUndo()
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{
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// makes sure the next operation will be stored
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undo_finished = true;
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}
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void freezeUndo()
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{
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// this is dangerous and for internal use only
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undo_frozen = true;
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}
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void unFreezeUndo()
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{
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// this is dangerous and for internal use only
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undo_frozen = false;
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}
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void setUndo(BufferView * bv, Undo::undo_kind kind,
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Paragraph const * first, Paragraph const * behind)
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{
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if (!undo_frozen)
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bv->buffer()->undostack.push(createUndo(bv, kind, first, behind));
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bv->buffer()->redostack.clear();
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}
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void setRedo(BufferView * bv, Undo::undo_kind kind,
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Paragraph const * first, Paragraph const * behind)
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{
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bv->buffer()->redostack.push(createUndo(bv, kind, first, behind));
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}
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Undo * createUndo(BufferView * bv, Undo::undo_kind kind,
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Paragraph const * first, Paragraph const * behind)
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{
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lyx::Assert(first);
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int before_number = -1;
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int behind_number = -1;
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int inset_id = -1;
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if (first->previous())
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before_number = first->previous()->id();
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if (behind)
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behind_number = behind->id();
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if (first->inInset())
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inset_id = first->inInset()->id();
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// Undo::EDIT and Undo::FINISH are
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// always finished. (no overlapping there)
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// overlapping only with insert and delete inside one paragraph:
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// Nobody wants all removed character
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// appear one by one when undoing.
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// EDIT is special since only layout information, not the
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// contents of a paragaph are stored.
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if (!undo_finished && (kind != Undo::EDIT) && (kind != Undo::FINISH)){
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// check wether storing is needed
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if (!bv->buffer()->undostack.empty() &&
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bv->buffer()->undostack.top()->kind == kind &&
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bv->buffer()->undostack.top()->number_of_before_par == before_number &&
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bv->buffer()->undostack.top()->number_of_behind_par == behind_number ){
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// no undo needed
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return 0;
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}
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}
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// create a new Undo
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Paragraph * undopar;
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Paragraph * start = const_cast<Paragraph *>(first);
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Paragraph * end = 0;
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#if 0
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if (first)
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start = const_cast<Paragraph*>(before->next());
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else
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start = firstUndoParagraph(bv);
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#endif
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if (behind)
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end = const_cast<Paragraph*>(behind->previous());
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else {
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end = start;
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while (end->next())
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end = end->next();
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}
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if (start && end && (start != end->next()) &&
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((before_number != behind_number) ||
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((before_number < 0) && (behind_number < 0)))) {
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Paragraph * tmppar = start;
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Paragraph * tmppar2 = new Paragraph(*tmppar, true);
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tmppar2->id(tmppar->id());
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// a memory optimization: Just store the layout information
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// when only edit
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if (kind == Undo::EDIT) {
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tmppar2->clearContents();
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}
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undopar = tmppar2;
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while (tmppar != end && tmppar->next()) {
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tmppar = tmppar->next();
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tmppar2->next(new Paragraph(*tmppar, false));
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tmppar2->next()->id(tmppar->id());
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// a memory optimization: Just store the layout
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// information when only edit
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if (kind == Undo::EDIT) {
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tmppar2->clearContents();
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}
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tmppar2->next()->previous(tmppar2);
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tmppar2 = tmppar2->next();
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}
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tmppar2->next(0);
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} else
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undopar = 0; // nothing to replace (undo of delete maybe)
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int cursor_par = undoCursor(bv).par()->id();
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int cursor_pos = undoCursor(bv).pos();
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Undo * undo = new Undo(kind, inset_id,
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before_number, behind_number,
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cursor_par, cursor_pos, undopar);
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undo_finished = false;
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return undo;
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}
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void setCursorParUndo(BufferView * bv)
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{
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setUndo(bv, Undo::FINISH,
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bv->text->cursor.par(),
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bv->text->cursor.par()->next());
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}
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Paragraph * firstUndoParagraph(BufferView * bv, int inset_id)
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{
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Inset * inset = bv->buffer()->getInsetFromID(inset_id);
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if (inset) {
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Paragraph * result = inset->firstParagraph();
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if (result)
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return result;
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}
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return bv->text->ownerParagraph();
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}
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LyXCursor const & undoCursor(BufferView * bv)
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{
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if (bv->theLockingInset())
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return bv->theLockingInset()->cursor(bv);
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return bv->text->cursor;
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}
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