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https://git.lyx.org/repos/lyx.git
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4b64a5f485
git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@3754 a592a061-630c-0410-9148-cb99ea01b6c8
457 lines
12 KiB
C
457 lines
12 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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#include "iterators.h"
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#define DELETE_UNUSED_PARAGRAPHS 1
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#ifdef DELETE_UNUSED_PARAGRAPHS
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#include <vector>
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#endif
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using std::vector;
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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.top();
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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 && first->next())
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first = first->next();
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else 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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// now we can unlock the inset for saftey because the inset pointer could
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// be changed during the undo-function. Anyway if needed we have to lock
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// the right inset/position if this is requested.
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freezeUndo();
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bv->unlockInset(bv->theLockingInset());
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bool ret = textHandleUndo(bv, undo);
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unFreezeUndo();
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return ret;
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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.top();
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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 && first->next())
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first = first->next();
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else 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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// now we can unlock the inset for saftey because the inset pointer could
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// be changed during the undo-function. Anyway if needed we have to lock
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// the right inset/position if this is requested.
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freezeUndo();
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bv->unlockInset(bv->theLockingInset());
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bool ret = textHandleUndo(bv, undo);
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unFreezeUndo();
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return ret;
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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 * 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
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delete the paragraph */
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// get last undo par and set the right(new) inset-owner of the
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// paragraph if there is any. This is not needed if we don't have
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// a paragraph before because then in is automatically done in the
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// function which assigns the first paragraph to an InsetText. (Jug)
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Paragraph * tmppar4 = tmppar3;
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if (tmppar4) {
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Inset * in = 0;
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if (before)
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in = before->inInset();
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else if (undo->number_of_inset_id >= 0)
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in = bv->buffer()->getInsetFromID(undo->number_of_inset_id);
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tmppar4->setInsetOwner(in);
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while (tmppar4->next()) {
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tmppar4 = tmppar4->next();
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tmppar4->setInsetOwner(in);
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}
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}
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// now remove the old text if there is any
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#ifdef DELETE_UNUSED_PARAGRAPHS
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vector<Paragraph *> vvpar;
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#endif
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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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#ifdef DELETE_UNUSED_PARAGRAPHS
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vvpar.push_back(tmppar5);
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#endif
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tmppar = tmppar5;
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tmppar5 = tmppar5->next();
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// a memory optimization for edit:
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// Only layout information
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// is stored in the undo. So restore
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// the text informations.
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if (undo->kind == Undo::EDIT) {
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tmppar2->setContentsFromPar(tmppar);
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#ifndef DELETE_UNUSED_PARAGRAPHS
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tmppar->clearContents();
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#endif
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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(firstUndoParagraph(bv, undo->number_of_inset_id)->id(),
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tmppar3);
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tmppar3->previous(before);
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} else {
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// We enter here on DELETE undo operations where we have to
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// substitue the second paragraph with the first if the removed
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// one is the first!
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if (!before && behind) {
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bv->text->ownerParagraph(firstUndoParagraph(bv, undo->number_of_inset_id)->id(),
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behind);
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tmppar3 = behind;
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}
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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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Inset * it = before->inInset();
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if (it)
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it->getLyXText(bv)->setCursorIntern(bv, before, 0);
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else
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bv->text->setCursorIntern(bv, before, 0);
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}
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Paragraph * endpar = 0;
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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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tmppar = bv->buffer()->getParFromID(undo->number_of_cursor_par);
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UpdatableInset* it = 0;
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if (tmppar3)
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it = static_cast<UpdatableInset*>(tmppar3->inInset());
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if (it) {
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it->getLyXText(bv)->redoParagraphs(bv,
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it->getLyXText(bv)->cursor,
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endpar);
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if (tmppar) {
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it = static_cast<UpdatableInset*>(tmppar->inInset());
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LyXText * t;
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if (it) {
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it->edit(bv);
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t = it->getLyXText(bv);
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} else {
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t = bv->text;
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}
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t->setCursorIntern(bv, tmppar, undo->cursor_pos);
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t->updateCounters(bv, t->cursor.row());
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bv->fitCursor();
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}
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bv->updateInset(it, false);
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bv->text->setCursorIntern(bv, bv->text->cursor.par(),
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bv->text->cursor.pos());
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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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LyXText * t;
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Inset * it = tmppar->inInset();
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if (it) {
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it->edit(bv);
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t = it->getLyXText(bv);
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} else {
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t = bv->text;
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}
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t->setCursorIntern(bv, tmppar, undo->cursor_pos);
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t->updateCounters(bv, t->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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#ifdef DELETE_UNUSED_PARAGRAPHS
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// And here it's save enough to delete all removed paragraphs
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vector<Paragraph *>::iterator pit = vvpar.begin();
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if (pit != vvpar.end()) {
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#if 0
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lyxerr << endl << "PARS BEFORE:";
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ParIterator end = bv->buffer()->par_iterator_end();
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ParIterator it = bv->buffer()->par_iterator_begin();
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for (; it != end; ++it)
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lyxerr << (*it)->previous() << "<- " << (*it) << " ->" << (*it)->next() << endl;
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lyxerr << "DEL: ";
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#endif
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for(;pit != vvpar.end(); ++pit) {
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// lyxerr << *pit << " ";
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(*pit)->previous(0);
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(*pit)->next(0);
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delete (*pit);
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}
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#if 0
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lyxerr << endl << "PARS AFTER:";
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end = bv->buffer()->par_iterator_end();
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it = bv->buffer()->par_iterator_begin();
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for (; it != end; ++it)
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lyxerr << (*it)->previous() << "<- " << (*it) << " ->" << (*it)->next() << endl;
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#endif
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}
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#endif
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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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}
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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 (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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{
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Paragraph * tmppar = start;
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Paragraph * tmppar2 = new Paragraph(*tmppar, true);
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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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#if 0
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tmppar2->next(new Paragraph(*tmppar, true));
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#else
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Paragraph * ptmp = new Paragraph(*tmppar, true);
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tmppar2->next(ptmp);
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#endif
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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, 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->getFirstParagraph(0);
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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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