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 #ifdef __GNUG__
  13 #pragma implementation
  14 #endif
  15
  16 #include "undo_funcs.h"
  17 #include "lyxtext.h"
  18 #include "BufferView.h"
  19 #include "buffer.h"
  20 #include "insets/inset.h"
  21 #include "debug.h"
  22 #include "support/LAssert.h"
  23
  24 /// the flag used by FinishUndo();
  25 bool undo_finished;
  26 /// a flag
  27 bool undo_frozen;
  28
  29 bool textUndo(BufferView * bv)
  30 {
  31         // returns false if no undo possible
  32         Undo * undo = bv->buffer()->undostack.pop();
  33         if (undo) {
  34                 finishUndo();
  35                 if (!undo_frozen) {
  36                         Paragraph * first = bv->buffer()->getParFromID(undo->number_of_before_par);
  37                         if (!first)
  38                                 first = firstUndoParagraph(bv, undo->number_of_inset_id);
  39                         if (first) {
  40                                 bv->buffer()->redostack.push(
  41                                         createUndo(bv, undo->kind, first,
  42                                                            bv->buffer()->getParFromID(undo->number_of_behind_par)));
  43                         }
  44                 }
  45         }
  46         return textHandleUndo(bv, undo);
  47 }
  48
  49
  50 bool textRedo(BufferView * bv)
  51 {
  52         // returns false if no redo possible
  53         Undo * undo = bv->buffer()->redostack.pop();
  54         if (undo) {
  55                 finishUndo();
  56                 if (!undo_frozen) {
  57                         Paragraph * first = bv->buffer()->getParFromID(undo->number_of_before_par);
  58                         if (!first)
  59                                 first = firstUndoParagraph(bv, undo->number_of_inset_id);
  60                         if (first) {
  61                                 bv->buffer()->undostack.push(
  62                                         createUndo(bv, undo->kind, first,
  63                                                    bv->buffer()->getParFromID(undo->number_of_behind_par)));
  64                         }
  65                 }
  66         }
  67         return textHandleUndo(bv, undo);
  68 }
  69
  70
  71 bool textHandleUndo(BufferView * bv, Undo * undo)
  72 {
  73         // returns false if no undo possible
  74         bool result = false;
  75         if (undo) {
  76                 Paragraph * before =
  77                         bv->buffer()->getParFromID(undo->number_of_before_par);
  78                 Paragraph * behind =
  79                         bv->buffer()->getParFromID(undo->number_of_behind_par);
  80                 Paragraph * tmppar;
  81                 Paragraph * tmppar2;
  82                 Paragraph * endpar;
  83                 Paragraph * tmppar5;
  84
  85                 // if there's no before take the beginning
  86                 // of the document for redoing
  87                 if (!before) {
  88                         LyXText * t = bv->text;
  89                         int num = undo->number_of_inset_id;
  90                         if (undo->number_of_inset_id >= 0) {
  91                                 Inset * in = bv->buffer()->getInsetFromID(num);
  92                                 if (in) {
  93                                         t = in->getLyXText(bv);
  94                                 } else {
  95                                         num = -1;
  96                                 }
  97                         }
  98                         t->setCursorIntern(bv, firstUndoParagraph(bv, num), 0);
  99                 }
 100
 101                 // replace the paragraphs with the undo informations
 102
 103                 Paragraph * tmppar3 = undo->par;
 104                 undo->par = 0; // otherwise the undo destructor would delete the paragraph
 105                 Paragraph * tmppar4 = tmppar3;
 106
 107                 if (tmppar4) {
 108                         while (tmppar4->next())
 109                                 tmppar4 = tmppar4->next();
 110                 } // get last undo par
 111
 112                 // now remove the old text if there is any
 113                 if (before != behind || (!behind && !before)) {
 114                         if (before)
 115                                 tmppar5 = before->next();
 116                         else
 117                                 tmppar5 = firstUndoParagraph(bv, undo->number_of_inset_id);
 118                         tmppar2 = tmppar3;
 119                         while (tmppar5 && tmppar5 != behind) {
 120                                 tmppar = tmppar5;
 121                                 tmppar5 = tmppar5->next();
 122                                 // a memory optimization for edit: Only layout information
 123                                 // is stored in the undo. So restore the text informations.
 124                                 if (undo->kind == Undo::EDIT) {
 125                                         tmppar2->setContentsFromPar(tmppar);
 126                                         tmppar->clearContents();
 127                                         tmppar2 = tmppar2->next();
 128                                 }
 129                         }
 130                 }
 131
 132                 // put the new stuff in the list if there is one
 133                 if (tmppar3){
 134                         if (before)
 135                                 before->next(tmppar3);
 136                         else
 137                                 bv->text->ownerParagraph(tmppar3->id(), tmppar3);
 138                         tmppar3->previous(before);
 139                 } else {
 140                         // Do we really enter here ??? (Jug)
 141                         if (!before)
 142                                 bv->text->ownerParagraph(behind);
 143                 }
 144                 if (tmppar4) {
 145                         tmppar4->next(behind);
 146                         if (behind)
 147                                 behind->previous(tmppar4);
 148                 }
 149
 150
 151                 // Set the cursor for redoing
 152                 if (before) {
 153                         bv->text->setCursorIntern(bv, before, 0);
 154                 }
 155
 156                 // calculate the endpar for redoing the paragraphs.
 157                 if (behind) {
 158                                 endpar = behind->next();
 159                 } else
 160                         endpar = behind;
 161
 162                 tmppar = bv->buffer()->getParFromID(undo->number_of_cursor_par);
 163                 UpdatableInset* it = static_cast<UpdatableInset*>(tmppar3->inInset());
 164                 if (it) {
 165                         it->getLyXText(bv)->redoParagraphs(bv, it->getLyXText(bv)->cursor,
 166                                                            endpar);
 167                         if (tmppar){
 168                                 it->getLyXText(bv)->setCursorIntern(bv, tmppar, undo->cursor_pos);
 169                                 it->getLyXText(bv)->updateCounters(bv, it->getLyXText(bv)->cursor.row());
 170                         }
 171 #ifdef THIS_DOES_NOT_WORK
 172                         // we need this anyway as also if the undo was inside an inset
 173                         // we have to redo the paragraph breaking
 174                         bv->text->redoParagraphs(bv, bv->text->cursor,
 175                                                                          bv->text->cursor.par());
 176 #endif
 177                 } else {
 178                         bv->text->redoParagraphs(bv, bv->text->cursor, endpar);
 179                         if (tmppar) {
 180                                 bv->text->setCursorIntern(bv, tmppar, undo->cursor_pos);
 181                                 bv->text->updateCounters(bv, bv->text->cursor.row());
 182                         }
 183                 }
 184                 result = true;
 185                 delete undo;
 186         }
 187         finishUndo();
 188         bv->text->status(bv, LyXText::NEED_MORE_REFRESH);
 189         return result;
 190 }
 191
 192
 193 void finishUndo()
 194 {
 195         // makes sure the next operation will be stored
 196         undo_finished = true;
 197 }
 198
 199
 200 void freezeUndo()
 201 {
 202         // this is dangerous and for internal use only
 203         undo_frozen = true;
 204 }
 205
 206
 207 void unFreezeUndo()
 208 {
 209         // this is dangerous and for internal use only
 210         undo_frozen = false;
 211 }
 212
 213
 214 void setUndo(BufferView * bv, Undo::undo_kind kind,
 215              Paragraph const * first, Paragraph const * behind)
 216 {
 217         if (!undo_frozen)
 218                 bv->buffer()->undostack.push(createUndo(bv, kind, first, behind));
 219         bv->buffer()->redostack.clear();
 220 }
 221
 222
 223 void setRedo(BufferView * bv, Undo::undo_kind kind,
 224              Paragraph const * first, Paragraph const * behind)
 225 {
 226         bv->buffer()->redostack.push(createUndo(bv, kind, first, behind));
 227 }
 228
 229
 230 Undo * createUndo(BufferView * bv, Undo::undo_kind kind,
 231                   Paragraph const * first, Paragraph const * behind)
 232 {
 233         lyx::Assert(first);
 234
 235         int before_number = -1;
 236         int behind_number = -1;
 237         int inset_id = -1;
 238
 239         if (first->previous())
 240                 before_number = first->previous()->id();
 241         if (behind)
 242                 behind_number = behind->id();
 243         if (first->inInset())
 244                 inset_id = first->inInset()->id();
 245
 246         // Undo::EDIT  and Undo::FINISH are
 247         // always finished. (no overlapping there)
 248         // overlapping only with insert and delete inside one paragraph:
 249         // Nobody wants all removed  character
 250         // appear one by one when undoing.
 251         // EDIT is special since only layout information, not the
 252         // contents of a paragaph are stored.
 253         if (!undo_finished && (kind != Undo::EDIT) && (kind != Undo::FINISH)){
 254                 // check wether storing is needed
 255                 if (!bv->buffer()->undostack.empty() &&
 256                     bv->buffer()->undostack.top()->kind == kind &&
 257                     bv->buffer()->undostack.top()->number_of_before_par ==  before_number &&
 258                     bv->buffer()->undostack.top()->number_of_behind_par ==  behind_number ){
 259                         // no undo needed
 260                         return 0;
 261                 }
 262         }
 263         // create a new Undo
 264         Paragraph * undopar;
 265
 266         Paragraph * start = const_cast<Paragraph *>(first);
 267         Paragraph * end = 0;
 268
 269 #if 0
 270         if (first)
 271                 start = const_cast<Paragraph*>(before->next());
 272         else
 273                 start = firstUndoParagraph(bv);
 274 #endif
 275         if (behind)
 276                 end = const_cast<Paragraph*>(behind->previous());
 277         else {
 278                 end = start;
 279                 while (end->next())
 280                         end = end->next();
 281         }
 282         if (start && end && (start != end->next()) &&
 283             ((before_number != behind_number) ||
 284                  ((before_number < 0) && (behind_number < 0)))) {
 285                 Paragraph * tmppar = start;
 286                 Paragraph * tmppar2 = new Paragraph(*tmppar, true);
 287                 tmppar2->id(tmppar->id());
 288
 289                 // a memory optimization: Just store the layout information
 290                 // when only edit
 291                 if (kind == Undo::EDIT) {
 292                         tmppar2->clearContents();
 293                 }
 294
 295                 undopar = tmppar2;
 296
 297                 while (tmppar != end && tmppar->next()) {
 298                         tmppar = tmppar->next();
 299                         tmppar2->next(new Paragraph(*tmppar, false));
 300                         tmppar2->next()->id(tmppar->id());
 301                         // a memory optimization: Just store the layout
 302                         // information when only edit
 303                         if (kind == Undo::EDIT) {
 304                                 tmppar2->clearContents();
 305                         }
 306                         tmppar2->next()->previous(tmppar2);
 307                         tmppar2 = tmppar2->next();
 308                 }
 309                 tmppar2->next(0);
 310         } else
 311                 undopar = 0; // nothing to replace (undo of delete maybe)
 312
 313         int cursor_par = undoCursor(bv).par()->id();
 314         int cursor_pos =  undoCursor(bv).pos();
 315
 316         Undo * undo = new Undo(kind, inset_id,
 317                                before_number, behind_number,
 318                                cursor_par, cursor_pos, undopar);
 319
 320         undo_finished = false;
 321         return undo;
 322 }
 323
 324
 325 void setCursorParUndo(BufferView * bv)
 326 {
 327         setUndo(bv, Undo::FINISH,
 328                 bv->text->cursor.par(),
 329                         bv->text->cursor.par()->next());
 330 }
 331
 332 Paragraph * firstUndoParagraph(BufferView * bv, int inset_id)
 333 {
 334         Inset * inset = bv->buffer()->getInsetFromID(inset_id);
 335         if (inset) {
 336                 Paragraph * result = inset->firstParagraph();
 337                 if (result)
 338                         return result;
 339         }
 340         return bv->text->ownerParagraph();
 341 }
 342
 343 LyXCursor const & undoCursor(BufferView * bv)
 344 {
 345         if (bv->theLockingInset())
 346                 return bv->theLockingInset()->cursor(bv);
 347         return bv->text->cursor;
 348 }