src/undo_funcs.C

   1 /* This file is part of
   2  * ======================================================
   3  *
   4  *           LyX, The Document Processor
   5  *
   6  *           Copyright 1995-2001 The LyX Team.
   7  *
   8  * ====================================================== */
   9
  10 #include <config.h>
  11
  12 #include "undo_funcs.h"
  13 #include "lyxtext.h"
  14 #include "BufferView.h"
  15 #include "buffer.h"
  16 #include "insets/updatableinset.h"
  17 #include "insets/insettext.h"
  18 #include "debug.h"
  19 #include "support/LAssert.h"
  20
  21 #include "iterators.h"
  22
  23 #include <vector>
  24
  25 using std::vector;
  26 using boost::shared_ptr;
  27
  28
  29 /// The flag used by FinishUndo().
  30 bool undo_finished;
  31 /// Whether actions are not added to the undo stacks.
  32 bool undo_frozen;
  33
  34 namespace {
  35
  36 /// Utility to return the cursor.
  37 LyXCursor const & undoCursor(BufferView * bv)
  38 {
  39         if (bv->theLockingInset())
  40                 return bv->theLockingInset()->cursor(bv);
  41         return bv->text->cursor;
  42 }
  43
  44
  45 /**
  46  * Returns a pointer to the very first Paragraph depending of where
  47  * we are so it will return the first paragraph of the buffer or the
  48  * first paragraph of the textinset we're in.
  49  */
  50 Paragraph * firstUndoParagraph(BufferView * bv, int inset_id)
  51 {
  52         Inset * inset = bv->buffer()->getInsetFromID(inset_id);
  53         if (inset) {
  54                 Paragraph * result = inset->getFirstParagraph(0);
  55                 if (result)
  56                         return result;
  57         }
  58         return &*bv->text->ownerParagraphs().begin();
  59 }
  60
  61
  62 /**
  63  * Finish the undo operation in the case there was no entry
  64  * on the stack to perform.
  65  */
  66 void finishNoUndo(BufferView * bv)
  67 {
  68         freezeUndo();
  69         bv->unlockInset(bv->theLockingInset());
  70         finishUndo();
  71         bv->text->postPaint(0);
  72         unFreezeUndo();
  73 }
  74
  75
  76 // Returns false if no undo possible.
  77 bool textHandleUndo(BufferView * bv, Undo & undo)
  78 {
  79         Buffer * b = bv->buffer();
  80
  81         Paragraph * const before = &*b->getParFromID(undo.number_of_before_par);
  82         Paragraph * const behind = &*b->getParFromID(undo.number_of_behind_par);
  83
  84         // If there's no before take the beginning
  85         // of the document for redoing.
  86         if (!before) {
  87                 LyXText * t = bv->text;
  88                 int num = undo.number_of_inset_id;
  89                 if (undo.number_of_inset_id >= 0) {
  90                         Inset * in = bv->buffer()->getInsetFromID(num);
  91                         if (in) {
  92                                 t = in->getLyXText(bv);
  93                         } else {
  94                                 num = -1;
  95                         }
  96                 }
  97                 t->setCursorIntern(firstUndoParagraph(bv, num), 0);
  98         }
  99
 100         // Set the right(new) inset-owner of the paragraph if there is any.
 101         if (!undo.pars.empty()) {
 102                 Inset * in = 0;
 103                 if (before)
 104                         in = before->inInset();
 105                 else if (undo.number_of_inset_id >= 0)
 106                         in = bv->buffer()->getInsetFromID(undo.number_of_inset_id);
 107                 for (size_t i = 0, n = undo.pars.size(); i < n; ++i)
 108                         undo.pars[i]->setInsetOwner(in);
 109         }
 110
 111         // Replace the paragraphs with the undo informations.
 112         vector<Paragraph *> deletelist;
 113
 114         // Now add old paragraphs to be deleted.
 115         if (before != behind || (!behind && !before)) {
 116                 Paragraph * deletepar;
 117                 if (before)
 118                         deletepar = before->next();
 119                 else
 120                         deletepar = firstUndoParagraph(bv, undo.number_of_inset_id);
 121                 Paragraph * tmppar2 = undo.pars.front();
 122                 while (deletepar && deletepar != behind) {
 123                         deletelist.push_back(deletepar);
 124                         Paragraph * tmppar = deletepar;
 125                         deletepar = deletepar->next();
 126
 127                         // A memory optimization for edit:
 128                         // Only layout information
 129                         // is stored in the undo. So restore
 130                         // the text informations.
 131                         if (undo.kind == Undo::EDIT) {
 132                                 tmppar2->setContentsFromPar(*tmppar);
 133                                 tmppar2 = tmppar2->next();
 134                         }
 135                 }
 136         }
 137
 138         // The order here is VERY IMPORTANT. We have to set the right
 139         // next/prev pointer in the paragraphs so that a rebuild of
 140         // the LyXText works!!!
 141
 142         // Thread the end of the undo onto the par in front if any.
 143         if (!undo.pars.empty()) {
 144                 undo.pars.back()->next(behind);
 145                 if (behind)
 146                         behind->previous(undo.pars.back());
 147         }
 148
 149         // Put the new stuff in the list if there is one.
 150         Paragraph * undopar     = undo.pars.empty() ? 0 : undo.pars.front();
 151         if (undopar) {
 152                 undopar->previous(before);
 153                 if (before)
 154                         before->next(undopar);
 155                 else {
 156                         int id = firstUndoParagraph(bv, undo.number_of_inset_id)->id();
 157                         Paragraph * op = &*bv->buffer()->getParFromID(id);
 158                         if (op && op->inInset()) {
 159                                 static_cast<InsetText*>(op->inInset())->paragraph(undopar);
 160                         } else {
 161                                 bv->buffer()->paragraphs.set(undopar);
 162                         }
 163                 }
 164         } else {
 165                 // We enter here on DELETE undo operations where we
 166                 // have to substitue the second paragraph with the
 167                 // first if the removed one is the first.
 168                 if (!before && behind) {
 169                         int id = firstUndoParagraph(bv, undo.number_of_inset_id)->id();
 170                         Paragraph * op = &*bv->buffer()->getParFromID(id);
 171                         if (op && op->inInset()) {
 172                                 static_cast<InsetText*>(op->inInset())->paragraph(behind);
 173                         } else {
 174                                 bv->buffer()->paragraphs.set(behind);
 175                         }
 176
 177                         undopar = behind;
 178                 }
 179         }
 180
 181
 182         // Set the cursor for redoing.
 183         // If we have a par before the undopar.
 184         if (before) {
 185                 Inset * it = before->inInset();
 186                 if (it)
 187                         it->getLyXText(bv)->setCursorIntern(before, 0);
 188                 else
 189                         bv->text->setCursorIntern(before, 0);
 190         }
 191
 192 // we are not ready for this we cannot set the cursor for a paragraph
 193 // which is not already in a row of LyXText!!!
 194 #if 0
 195         else { // otherwise this is the first one and we start here
 196                 Inset * it = undopar->inInset();
 197                 if (it)
 198                         it->getLyXText(bv)->setCursorIntern(bv, undopar, 0);
 199                 else
 200                         bv->text->setCursorIntern(bv, undopar, 0);
 201         }
 202 #endif
 203
 204         Paragraph * endpar = 0;
 205
 206         // Calculate the endpar for redoing the paragraphs.
 207         if (behind)
 208                 endpar = behind->next();
 209
 210         UpdatableInset * it = 0;
 211         if (undopar)
 212                 it = static_cast<UpdatableInset*>(undopar->inInset());
 213         if (it) {
 214                 it->getLyXText(bv)->redoParagraphs(
 215                                                    it->getLyXText(bv)->cursor,
 216                                                    endpar);
 217                 Paragraph * tmppar =
 218                         &*bv->buffer()->getParFromID(undo.number_of_cursor_par);
 219                 if (tmppar) {
 220                         it = static_cast<UpdatableInset*>(tmppar->inInset());
 221                         LyXText * t;
 222                         if (it) {
 223                                 it->edit(bv);
 224                                 t = it->getLyXText(bv);
 225                         } else {
 226                                 t = bv->text;
 227                         }
 228                         t->setCursorIntern(tmppar, undo.cursor_pos);
 229                         // Clear any selection and set the selection
 230                         // cursor for an evt. new selection.
 231                         t->clearSelection();
 232                         t->selection.cursor = t->cursor;
 233                         t->updateCounters();
 234                         bv->fitCursor();
 235                 }
 236                 bv->updateInset(it);
 237                 bv->text->setCursorIntern(bv->text->cursor.par(),
 238                                           bv->text->cursor.pos());
 239         } else {
 240                 bv->text->redoParagraphs(bv->text->cursor, endpar);
 241                 Paragraph * tmppar =
 242                         &*bv->buffer()->getParFromID(undo.number_of_cursor_par);
 243                 if (tmppar) {
 244                         LyXText * t;
 245                         Inset * it = tmppar->inInset();
 246                         if (it) {
 247                                 it->edit(bv);
 248                                 t = it->getLyXText(bv);
 249                         } else {
 250                                 t = bv->text;
 251                         }
 252                         t->setCursorIntern(tmppar, undo.cursor_pos);
 253                         // Clear any selection and set the selection
 254                         // cursor for an evt. new selection.
 255                         t->clearSelection();
 256                         t->selection.cursor = t->cursor;
 257                         t->updateCounters();
 258                 }
 259         }
 260
 261         // And here it's safe enough to delete all removed paragraphs.
 262         vector<Paragraph *>::iterator pit = deletelist.begin();
 263         for(; pit != deletelist.end(); ++pit) {
 264                 (*pit)->previous(0);
 265                 (*pit)->next(0);
 266                 delete (*pit);
 267         }
 268
 269         // Otherwise the undo destructor would delete the paragraphs
 270         undo.pars.resize(0);
 271
 272         finishUndo();
 273         bv->text->postPaint(0);
 274         return true;
 275 }
 276
 277
 278 bool createUndo(BufferView * bv, Undo::undo_kind kind,
 279         ParagraphList::iterator itfirst, ParagraphList::iterator itbehind,
 280         shared_ptr<Undo> & u)
 281 {
 282         Paragraph * const first = &*itfirst;
 283         Paragraph * const behind = &*itbehind;
 284         lyx::Assert(first);
 285
 286         int before_number = -1;
 287         int behind_number = -1;
 288         int inset_id = -1;
 289
 290         if (first->previous())
 291                 before_number = first->previous()->id();
 292         if (behind)
 293                 behind_number = behind->id();
 294         if (first->inInset())
 295                 inset_id = first->inInset()->id();
 296
 297         Buffer * b = bv->buffer();
 298
 299         // Undo::EDIT  and Undo::FINISH are
 300         // always finished. (no overlapping there)
 301         // overlapping only with insert and delete inside one paragraph:
 302         // Nobody wants all removed  character
 303         // appear one by one when undoing.
 304         // EDIT is special since only layout information, not the
 305         // contents of a paragaph are stored.
 306         if (!undo_finished && (kind != Undo::EDIT) && (kind != Undo::FINISH)) {
 307                 // Check whether storing is needed.
 308                 if (!b->undostack.empty() &&
 309                     b->undostack.top()->kind == kind &&
 310                     b->undostack.top()->number_of_before_par == before_number &&
 311                     b->undostack.top()->number_of_behind_par == behind_number) {
 312                         // No undo needed.
 313                         return false;
 314                 }
 315         }
 316
 317         // Create a new Undo.
 318         std::vector<Paragraph *> undo_pars;
 319
 320         Paragraph const * end = 0;
 321
 322         if (behind)
 323                 end = behind->previous();
 324         else {
 325                 end = first;
 326                 while (end->next())
 327                         end = end->next();
 328         }
 329
 330         if (first && end && (first != end->next()) &&
 331             ((before_number != behind_number) ||
 332                  ((before_number < 0) && (behind_number < 0))))
 333         {
 334                 undo_pars.push_back(new Paragraph(*first, true));
 335                 for (Paragraph * tmppar = first; tmppar != end && tmppar->next(); ) {
 336                         tmppar = tmppar->next();
 337                         undo_pars.push_back(new Paragraph(*tmppar, true));
 338                         size_t const n = undo_pars.size();
 339                         undo_pars[n - 2]->next(undo_pars[n - 1]);
 340                         undo_pars[n - 1]->previous(undo_pars[n - 2]);
 341                 }
 342                 undo_pars.back()->next(0);
 343         }
 344
 345         // A memory optimization: Just store the layout
 346         // information when only edit.
 347         if (kind == Undo::EDIT) {
 348                 for (size_t i = 0, n = undo_pars.size(); i < n; ++i)
 349                         undo_pars[i]->clearContents();
 350         }
 351
 352         int cursor_par = undoCursor(bv).par()->id();
 353         int cursor_pos = undoCursor(bv).pos();
 354
 355         //lyxerr << "createUndo: inset_id: " << inset_id << "  before_number: "
 356         //      << before_number << "  behind_number: " << behind_number << "\n";
 357         u.reset(new Undo(kind, inset_id,
 358                 before_number, behind_number,
 359                 cursor_par, cursor_pos, undo_pars));
 360
 361         undo_finished = false;
 362         return true;
 363 }
 364
 365
 366 // Returns false if no undo possible.
 367 bool textUndoOrRedo(BufferView * bv,
 368         limited_stack<boost::shared_ptr<Undo> > & stack,
 369         limited_stack<boost::shared_ptr<Undo> > & otherstack)
 370 {
 371         Buffer * b = bv->buffer();
 372
 373         if (stack.empty()) {
 374                 finishNoUndo(bv);
 375                 return false;
 376         }
 377
 378         shared_ptr<Undo> undo = stack.top();
 379         stack.pop();
 380         finishUndo();
 381
 382         if (!undo_frozen) {
 383                 Paragraph * first = &*b->getParFromID(undo->number_of_before_par);
 384                 if (first && first->next())
 385                         first = first->next();
 386                 else if (!first)
 387                         first = firstUndoParagraph(bv, undo->number_of_inset_id);
 388                 if (first) {
 389                         shared_ptr<Undo> u;
 390                         if (createUndo(bv, undo->kind, first,
 391                                              b->getParFromID(undo->number_of_behind_par), u))
 392                                 otherstack.push(u);
 393                 }
 394         }
 395
 396         // Now we can unlock the inset for saftey because the inset
 397         // pointer could be changed during the undo-function. Anyway
 398         // if needed we have to lock the right inset/position if this
 399         // is requested.
 400         freezeUndo();
 401         bv->unlockInset(bv->theLockingInset());
 402         bool const ret = textHandleUndo(bv, *undo.get());
 403         unFreezeUndo();
 404         return ret;
 405 }
 406
 407 } // namespace anon
 408
 409
 410 void finishUndo()
 411 {
 412         // Makes sure the next operation will be stored.
 413         undo_finished = true;
 414 }
 415
 416
 417 void freezeUndo()
 418 {
 419         // This is dangerous and for internal use only.
 420         undo_frozen = true;
 421 }
 422
 423
 424 void unFreezeUndo()
 425 {
 426         // This is dangerous and for internal use only.
 427         undo_frozen = false;
 428 }
 429
 430
 431 bool textUndo(BufferView * bv)
 432 {
 433         return textUndoOrRedo(bv, bv->buffer()->undostack,
 434                               bv->buffer()->redostack);
 435 }
 436
 437
 438 bool textRedo(BufferView * bv)
 439 {
 440         return textUndoOrRedo(bv, bv->buffer()->redostack,
 441                               bv->buffer()->undostack);
 442 }
 443
 444
 445 void setUndo(BufferView * bv, Undo::undo_kind kind,
 446              ParagraphList::iterator first, ParagraphList::iterator behind)
 447 {
 448         if (!undo_frozen) {
 449                 shared_ptr<Undo> u;
 450                 if (createUndo(bv, kind, first, behind, u))
 451                         bv->buffer()->undostack.push(u);
 452                 bv->buffer()->redostack.clear();
 453         }
 454 }
 455
 456
 457 void setRedo(BufferView * bv, Undo::undo_kind kind,
 458              ParagraphList::iterator first, ParagraphList::iterator behind)
 459 {
 460         shared_ptr<Undo> u;
 461         if (createUndo(bv, kind, first, behind, u))
 462                 bv->buffer()->redostack.push(u);
 463 }
 464
 465
 466 void setCursorParUndo(BufferView * bv)
 467 {
 468         setUndo(bv, Undo::FINISH, bv->text->cursor.par(),
 469                 boost::next(bv->text->cursor.par()));
 470 }