src/text.C

   1 /* This file is part of
   2  * ======================================================
   3  *
   4  *           LyX, The Document Processor
   5  *
   6  *           Copyright 1995 Matthias Ettrich
   7  *           Copyright 1995-2001 The LyX Team.
   8  *
   9  * ====================================================== */
  10
  11 #include <config.h>
  12
  13 #include "lyxtext.h"
  14 #include "paragraph.h"
  15 #include "gettext.h"
  16 #include "bufferparams.h"
  17 #include "buffer.h"
  18 #include "debug.h"
  19 #include "intl.h"
  20 #include "lyxrc.h"
  21 #include "encoding.h"
  22 #include "frontends/LyXView.h"
  23 #include "frontends/Painter.h"
  24 #include "frontends/font_metrics.h"
  25 #include "frontends/screen.h"
  26 #include "frontends/WorkArea.h"
  27 #include "bufferview_funcs.h"
  28 #include "BufferView.h"
  29 #include "language.h"
  30 #include "ParagraphParameters.h"
  31 #include "undo_funcs.h"
  32 #include "text_funcs.h"
  33 #include "WordLangTuple.h"
  34 #include "paragraph_funcs.h"
  35 #include "rowpainter.h"
  36 #include "lyxrow_funcs.h"
  37 #include "metricsinfo.h"
  38
  39 #include "insets/insettext.h"
  40
  41 #include "support/textutils.h"
  42 #include "support/LAssert.h"
  43 #include "support/lstrings.h"
  44
  45 #include <algorithm>
  46
  47 using namespace lyx::support;
  48
  49 using std::max;
  50 using std::min;
  51 using std::endl;
  52 using std::pair;
  53
  54 using lyx::pos_type;
  55 using lyx::word_location;
  56
  57 using namespace bv_funcs;
  58
  59 /// top, right, bottom pixel margin
  60 extern int const PAPER_MARGIN = 20;
  61 /// margin for changebar
  62 extern int const CHANGEBAR_MARGIN = 10;
  63 /// left margin
  64 extern int const LEFT_MARGIN = PAPER_MARGIN + CHANGEBAR_MARGIN;
  65
  66 int bibitemMaxWidth(BufferView *, LyXFont const &);
  67
  68
  69 BufferView * LyXText::bv()
  70 {
  71         Assert(bv_owner != 0);
  72         return bv_owner;
  73 }
  74
  75
  76 BufferView * LyXText::bv() const
  77 {
  78         Assert(bv_owner != 0);
  79         return bv_owner;
  80 }
  81
  82
  83 void LyXText::updateRowPositions()
  84 {
  85         ParagraphList::iterator pit = ownerParagraphs().begin();
  86         ParagraphList::iterator end = ownerParagraphs().end();
  87         for (int y = 0; pit != end; ++pit) {
  88                 RowList::iterator rit = pit->rows.begin();
  89                 RowList::iterator rend = pit->rows.end();
  90                 for ( ; rit != rend ; rit = ++rit) {
  91                         rit->y(y);
  92                         y += rit->height();
  93                 }
  94         }
  95 }
  96
  97
  98 int LyXText::top_y() const
  99 {
 100         return anchor_y_;
 101 }
 102
 103
 104 void LyXText::top_y(int newy)
 105 {
 106         anchor_y_ = newy;
 107         lyxerr[Debug::GUI] << "changing reference to offset: " << anchor_y_ << endl;
 108 }
 109
 110
 111 int LyXText::workWidth() const
 112 {
 113         return inset_owner ? inset_owner->textWidth() : bv()->workWidth();
 114 }
 115
 116
 117 int LyXText::getRealCursorX() const
 118 {
 119         int x = cursor.x();
 120         if (the_locking_inset && (the_locking_inset->getLyXText(bv())!= this))
 121                 x = the_locking_inset->getLyXText(bv())->getRealCursorX();
 122         return x;
 123 }
 124
 125
 126 #warning FIXME  This function seems to belong outside of LyxText.
 127 unsigned char LyXText::transformChar(unsigned char c, Paragraph const & par,
 128                                      pos_type pos) const
 129 {
 130         if (!Encodings::is_arabic(c))
 131                 if (lyxrc.font_norm_type == LyXRC::ISO_8859_6_8 && IsDigit(c))
 132                         return c + (0xb0 - '0');
 133                 else
 134                         return c;
 135
 136         unsigned char const prev_char = pos > 0 ? par.getChar(pos - 1) : ' ';
 137         unsigned char next_char = ' ';
 138
 139         pos_type const par_size = par.size();
 140
 141         for (pos_type i = pos + 1; i < par_size; ++i) {
 142                 unsigned char const par_char = par.getChar(i);
 143                 if (!Encodings::IsComposeChar_arabic(par_char)) {
 144                         next_char = par_char;
 145                         break;
 146                 }
 147         }
 148
 149         if (Encodings::is_arabic(next_char)) {
 150                 if (Encodings::is_arabic(prev_char) &&
 151                         !Encodings::is_arabic_special(prev_char))
 152                         return Encodings::TransformChar(c, Encodings::FORM_MEDIAL);
 153                 else
 154                         return Encodings::TransformChar(c, Encodings::FORM_INITIAL);
 155         } else {
 156                 if (Encodings::is_arabic(prev_char) &&
 157                         !Encodings::is_arabic_special(prev_char))
 158                         return Encodings::TransformChar(c, Encodings::FORM_FINAL);
 159                 else
 160                         return Encodings::TransformChar(c, Encodings::FORM_ISOLATED);
 161         }
 162 }
 163
 164 // This is the comments that some of the warnings below refers to.
 165 // There are some issues in this file and I don't think they are
 166 // really related to the FIX_DOUBLE_SPACE patch. I'd rather think that
 167 // this is a problem that has been here almost from day one and that a
 168 // larger userbase with differenct access patters triggers the bad
 169 // behaviour. (segfaults.) What I think happen is: In several places
 170 // we store the paragraph in the current cursor and then moves the
 171 // cursor. This movement of the cursor will delete paragraph at the
 172 // old position if it is now empty. This will make the temporary
 173 // pointer to the old cursor paragraph invalid and dangerous to use.
 174 // And is some cases this will trigger a segfault. I have marked some
 175 // of the cases where this happens with a warning, but I am sure there
 176 // are others in this file and in text2.C. There is also a note in
 177 // Delete() that you should read. In Delete I store the paragraph->id
 178 // instead of a pointer to the paragraph. I am pretty sure this faulty
 179 // use of temporary pointers to paragraphs that might have gotten
 180 // invalidated (through a cursor movement) before they are used, are
 181 // the cause of the strange crashes we get reported often.
 182 //
 183 // It is very tiresom to change this code, especially when it is as
 184 // hard to read as it is. Help to fix all the cases where this is done
 185 // would be greately appreciated.
 186 //
 187 // Lgb
 188
 189 int LyXText::singleWidth(ParagraphList::iterator pit, pos_type pos) const
 190 {
 191         if (pos >= pit->size())
 192                 return 0;
 193
 194         char const c = pit->getChar(pos);
 195         LyXFont const & font = getFont(pit, pos);
 196         return singleWidth(pit, pos, c, font);
 197 }
 198
 199
 200 int LyXText::singleWidth(ParagraphList::iterator pit,
 201                          pos_type pos, char c, LyXFont const & font) const
 202 {
 203         if (pos >= pit->size()) {
 204                 lyxerr << "in singleWidth(), pos: " << pos << endl;
 205                 Assert(false);
 206                 return 0;
 207         }
 208
 209
 210         // The most common case is handled first (Asger)
 211         if (IsPrintable(c)) {
 212                 if (font.language()->RightToLeft()) {
 213                         if ((lyxrc.font_norm_type == LyXRC::ISO_8859_6_8 ||
 214                              lyxrc.font_norm_type == LyXRC::ISO_10646_1)
 215                             && font.language()->lang() == "arabic") {
 216                                 if (Encodings::IsComposeChar_arabic(c))
 217                                         return 0;
 218                                 else
 219                                         c = transformChar(c, *pit, pos);
 220                         } else if (font.language()->lang() == "hebrew" &&
 221                                  Encodings::IsComposeChar_hebrew(c))
 222                                 return 0;
 223                 }
 224                 return font_metrics::width(c, font);
 225         }
 226
 227         if (c == Paragraph::META_INSET) {
 228                 InsetOld * tmpinset = pit->getInset(pos);
 229                 Assert(tmpinset);
 230                 if (tmpinset->lyxCode() == InsetOld::HFILL_CODE) {
 231                         // Because of the representation as vertical lines
 232                         return 3;
 233                 }
 234                 return tmpinset->width();
 235         }
 236
 237         if (IsSeparatorChar(c))
 238                 c = ' ';
 239         return font_metrics::width(c, font);
 240 }
 241
 242
 243 lyx::pos_type LyXText::log2vis(lyx::pos_type pos) const
 244 {
 245         if (bidi_start == -1)
 246                 return pos;
 247         else
 248                 return log2vis_list[pos - bidi_start];
 249 }
 250
 251
 252 lyx::pos_type LyXText::vis2log(lyx::pos_type pos) const
 253 {
 254         if (bidi_start == -1)
 255                 return pos;
 256         else
 257                 return vis2log_list[pos - bidi_start];
 258 }
 259
 260
 261 lyx::pos_type LyXText::bidi_level(lyx::pos_type pos) const
 262 {
 263         if (bidi_start == -1)
 264                 return 0;
 265         else
 266                 return bidi_levels[pos - bidi_start];
 267 }
 268
 269
 270 bool LyXText::bidi_InRange(lyx::pos_type pos) const
 271 {
 272         return bidi_start == -1 ||
 273                 (bidi_start <= pos && pos <= bidi_end);
 274 }
 275
 276
 277 void LyXText::computeBidiTables(ParagraphList::iterator pit,
 278    Buffer const * buf, RowList::iterator row) const
 279 {
 280         bidi_same_direction = true;
 281         if (!lyxrc.rtl_support) {
 282                 bidi_start = -1;
 283                 return;
 284         }
 285
 286         InsetOld * inset = pit->inInset();
 287         if (inset && inset->owner() &&
 288             inset->owner()->lyxCode() == InsetOld::ERT_CODE) {
 289                 bidi_start = -1;
 290                 return;
 291         }
 292
 293         bidi_start = row->pos();
 294         bidi_end = lastPrintablePos(*pit, row);
 295
 296         if (bidi_start > bidi_end) {
 297                 bidi_start = -1;
 298                 return;
 299         }
 300
 301         if (bidi_end + 2 - bidi_start >
 302             static_cast<pos_type>(log2vis_list.size())) {
 303                 pos_type new_size =
 304                         (bidi_end + 2 - bidi_start < 500) ?
 305                         500 : 2 * (bidi_end + 2 - bidi_start);
 306                 log2vis_list.resize(new_size);
 307                 vis2log_list.resize(new_size);
 308                 bidi_levels.resize(new_size);
 309         }
 310
 311         vis2log_list[bidi_end + 1 - bidi_start] = -1;
 312         log2vis_list[bidi_end + 1 - bidi_start] = -1;
 313
 314         pos_type stack[2];
 315         bool const rtl_par =
 316                 pit->isRightToLeftPar(buf->params);
 317         int level = 0;
 318         bool rtl = false;
 319         bool rtl0 = false;
 320         pos_type const body_pos = pit->beginningOfBody();
 321
 322         for (pos_type lpos = bidi_start; lpos <= bidi_end; ++lpos) {
 323                 bool is_space = pit->isLineSeparator(lpos);
 324                 pos_type const pos =
 325                         (is_space && lpos + 1 <= bidi_end &&
 326                          !pit->isLineSeparator(lpos + 1) &&
 327                          !pit->isNewline(lpos + 1))
 328                         ? lpos + 1 : lpos;
 329                 LyXFont font = pit->getFontSettings(buf->params, pos);
 330                 if (pos != lpos && 0 < lpos && rtl0 && font.isRightToLeft() &&
 331                     font.number() == LyXFont::ON &&
 332                     pit->getFontSettings(buf->params, lpos - 1).number()
 333                     == LyXFont::ON) {
 334                         font = pit->getFontSettings(buf->params, lpos);
 335                         is_space = false;
 336                 }
 337
 338
 339                 bool new_rtl = font.isVisibleRightToLeft();
 340                 bool new_rtl0 = font.isRightToLeft();
 341                 int new_level;
 342
 343                 if (lpos == body_pos - 1
 344                     && row->pos() < body_pos - 1
 345                     && is_space) {
 346                         new_level = (rtl_par) ? 1 : 0;
 347                         new_rtl = new_rtl0 = rtl_par;
 348                 } else if (new_rtl0)
 349                         new_level = (new_rtl) ? 1 : 2;
 350                 else
 351                         new_level = (rtl_par) ? 2 : 0;
 352
 353                 if (is_space && new_level >= level) {
 354                         new_level = level;
 355                         new_rtl = rtl;
 356                         new_rtl0 = rtl0;
 357                 }
 358
 359                 int new_level2 = new_level;
 360
 361                 if (level == new_level && rtl0 != new_rtl0) {
 362                         --new_level2;
 363                         log2vis_list[lpos - bidi_start] = (rtl) ? 1 : -1;
 364                 } else if (level < new_level) {
 365                         log2vis_list[lpos - bidi_start] =  (rtl) ? -1 : 1;
 366                         if (new_level > rtl_par)
 367                                 bidi_same_direction = false;
 368                 } else
 369                         log2vis_list[lpos - bidi_start] = (new_rtl) ? -1 : 1;
 370                 rtl = new_rtl;
 371                 rtl0 = new_rtl0;
 372                 bidi_levels[lpos - bidi_start] = new_level;
 373
 374                 while (level > new_level2) {
 375                         pos_type old_lpos = stack[--level];
 376                         int delta = lpos - old_lpos - 1;
 377                         if (level % 2)
 378                                 delta = -delta;
 379                         log2vis_list[lpos - bidi_start] += delta;
 380                         log2vis_list[old_lpos - bidi_start] += delta;
 381                 }
 382                 while (level < new_level)
 383                         stack[level++] = lpos;
 384         }
 385
 386         while (level > 0) {
 387                 pos_type const old_lpos = stack[--level];
 388                 int delta = bidi_end - old_lpos;
 389                 if (level % 2)
 390                         delta = -delta;
 391                 log2vis_list[old_lpos - bidi_start] += delta;
 392         }
 393
 394         pos_type vpos = bidi_start - 1;
 395         for (pos_type lpos = bidi_start;
 396              lpos <= bidi_end; ++lpos) {
 397                 vpos += log2vis_list[lpos - bidi_start];
 398                 vis2log_list[vpos - bidi_start] = lpos;
 399                 log2vis_list[lpos - bidi_start] = vpos;
 400         }
 401 }
 402
 403
 404 // This method requires a previous call to ComputeBidiTables()
 405 bool LyXText::isBoundary(Buffer const * buf, Paragraph const & par,
 406                          pos_type pos) const
 407 {
 408         if (!lyxrc.rtl_support || pos == 0)
 409                 return false;
 410
 411         if (!bidi_InRange(pos - 1)) {
 412                 /// This can happen if pos is the first char of a row.
 413                 /// Returning false in this case is incorrect!
 414                 return false;
 415         }
 416
 417         bool const rtl = bidi_level(pos - 1) % 2;
 418         bool const rtl2 = bidi_InRange(pos)
 419                 ? bidi_level(pos) % 2
 420                 : par.isRightToLeftPar(buf->params);
 421         return rtl != rtl2;
 422 }
 423
 424
 425 bool LyXText::isBoundary(Buffer const * buf, Paragraph const & par,
 426                          pos_type pos, LyXFont const & font) const
 427 {
 428         if (!lyxrc.rtl_support)
 429                 return false;    // This is just for speedup
 430
 431         bool const rtl = font.isVisibleRightToLeft();
 432         bool const rtl2 = bidi_InRange(pos)
 433                 ? bidi_level(pos) % 2
 434                 : par.isRightToLeftPar(buf->params);
 435         return rtl != rtl2;
 436 }
 437
 438
 439 int LyXText::leftMargin(ParagraphList::iterator pit, Row const & row) const
 440 {
 441         InsetOld * ins;
 442
 443         if (row.pos() < pit->size())
 444                 if (pit->getChar(row.pos()) == Paragraph::META_INSET &&
 445                     (ins = pit->getInset(row.pos())) &&
 446                     (ins->needFullRow() || ins->display()))
 447                         return LEFT_MARGIN;
 448
 449         LyXTextClass const & tclass =
 450                 bv()->buffer()->params.getLyXTextClass();
 451         LyXLayout_ptr const & layout = pit->layout();
 452
 453         string parindent = layout->parindent;
 454
 455         int x = LEFT_MARGIN;
 456
 457         x += font_metrics::signedWidth(tclass.leftmargin(), tclass.defaultfont());
 458
 459         // this is the way, LyX handles the LaTeX-Environments.
 460         // I have had this idea very late, so it seems to be a
 461         // later added hack and this is true
 462         if (!pit->getDepth()) {
 463                 if (pit->layout() == tclass.defaultLayout()) {
 464                         // find the previous same level paragraph
 465                         if (pit != ownerParagraphs().begin()) {
 466                                 ParagraphList::iterator newpit =
 467                                         depthHook(pit, ownerParagraphs(),
 468                                                   pit->getDepth());
 469                                 if (newpit == pit &&
 470                                     newpit->layout()->nextnoindent)
 471                                         parindent.erase();
 472                         }
 473                 }
 474         } else {
 475                 // find the next level paragraph
 476
 477                 ParagraphList::iterator newpar = outerHook(pit,
 478                                                            ownerParagraphs());
 479
 480                 // make a corresponding row. Needed to call leftMargin()
 481
 482                 // check wether it is a sufficent paragraph
 483                 if (newpar != ownerParagraphs().end() &&
 484                     newpar->layout()->isEnvironment()) {
 485                         x = leftMargin(newpar, Row(newpar->size()));
 486                 }
 487
 488                 if (newpar != ownerParagraphs().end() &&
 489                     pit->layout() == tclass.defaultLayout()) {
 490                         if (newpar->params().noindent())
 491                                 parindent.erase();
 492                         else {
 493                                 parindent = newpar->layout()->parindent;
 494                         }
 495
 496                 }
 497         }
 498
 499         LyXFont const labelfont = getLabelFont(pit);
 500         switch (layout->margintype) {
 501         case MARGIN_DYNAMIC:
 502                 if (!layout->leftmargin.empty()) {
 503                         x += font_metrics::signedWidth(layout->leftmargin,
 504                                                   tclass.defaultfont());
 505                 }
 506                 if (!pit->getLabelstring().empty()) {
 507                         x += font_metrics::signedWidth(layout->labelindent,
 508                                                   labelfont);
 509                         x += font_metrics::width(pit->getLabelstring(),
 510                                             labelfont);
 511                         x += font_metrics::width(layout->labelsep, labelfont);
 512                 }
 513                 break;
 514         case MARGIN_MANUAL:
 515                 x += font_metrics::signedWidth(layout->labelindent, labelfont);
 516                 // The width of an empty par, even with manual label, should be 0
 517                 if (!pit->empty() && row.pos() >= pit->beginningOfBody()) {
 518                         if (!pit->getLabelWidthString().empty()) {
 519                                 x += font_metrics::width(pit->getLabelWidthString(),
 520                                                labelfont);
 521                                 x += font_metrics::width(layout->labelsep, labelfont);
 522                         }
 523                 }
 524                 break;
 525         case MARGIN_STATIC:
 526                 x += font_metrics::signedWidth(layout->leftmargin, tclass.defaultfont()) * 4
 527                         / (pit->getDepth() + 4);
 528                 break;
 529         case MARGIN_FIRST_DYNAMIC:
 530                 if (layout->labeltype == LABEL_MANUAL) {
 531                         if (row.pos() >= pit->beginningOfBody()) {
 532                                 x += font_metrics::signedWidth(layout->leftmargin,
 533                                                           labelfont);
 534                         } else {
 535                                 x += font_metrics::signedWidth(layout->labelindent,
 536                                                           labelfont);
 537                         }
 538                 } else if (row.pos()
 539                            // Special case to fix problems with
 540                            // theorems (JMarc)
 541                            || (layout->labeltype == LABEL_STATIC
 542                                && layout->latextype == LATEX_ENVIRONMENT
 543                                && !isFirstInSequence(pit, ownerParagraphs()))) {
 544                         x += font_metrics::signedWidth(layout->leftmargin,
 545                                                   labelfont);
 546                 } else if (layout->labeltype != LABEL_TOP_ENVIRONMENT
 547                            && layout->labeltype != LABEL_BIBLIO
 548                            && layout->labeltype !=
 549                            LABEL_CENTERED_TOP_ENVIRONMENT) {
 550                         x += font_metrics::signedWidth(layout->labelindent,
 551                                                   labelfont);
 552                         x += font_metrics::width(layout->labelsep, labelfont);
 553                         x += font_metrics::width(pit->getLabelstring(),
 554                                             labelfont);
 555                 }
 556                 break;
 557
 558         case MARGIN_RIGHT_ADDRESS_BOX:
 559         {
 560                 // ok, a terrible hack. The left margin depends on the widest
 561                 // row in this paragraph. Do not care about footnotes, they
 562                 // are *NOT* allowed in the LaTeX realisation of this layout.
 563
 564                 // find the first row of this paragraph
 565                 RowList::iterator rit = pit->rows.begin();
 566                 RowList::iterator end = pit->rows.end();
 567                 int minfill = rit->fill();
 568                 for ( ; rit != end; ++rit)
 569                         if (rit->fill() < minfill)
 570                                 minfill = rit->fill();
 571
 572                 x += font_metrics::signedWidth(layout->leftmargin,
 573                         tclass.defaultfont());
 574                 x += minfill;
 575         }
 576         break;
 577         }
 578
 579         if (workWidth() > 0 && !pit->params().leftIndent().zero()) {
 580                 LyXLength const len = pit->params().leftIndent();
 581                 int const tw = inset_owner ?
 582                         inset_owner->latexTextWidth(bv()) : workWidth();
 583                 x += len.inPixels(tw);
 584         }
 585
 586         LyXAlignment align;
 587
 588         if (pit->params().align() == LYX_ALIGN_LAYOUT)
 589                 align = layout->align;
 590         else
 591                 align = pit->params().align();
 592
 593         // set the correct parindent
 594         if (row.pos() == 0) {
 595                 if ((layout->labeltype == LABEL_NO_LABEL
 596                      || layout->labeltype == LABEL_TOP_ENVIRONMENT
 597                      || layout->labeltype == LABEL_CENTERED_TOP_ENVIRONMENT
 598                      || (layout->labeltype == LABEL_STATIC
 599                          && layout->latextype == LATEX_ENVIRONMENT
 600                          && !isFirstInSequence(pit, ownerParagraphs())))
 601                     && align == LYX_ALIGN_BLOCK
 602                     && !pit->params().noindent()
 603                         // in tabulars and ert paragraphs are never indented!
 604                         && (!pit->inInset() || !pit->inInset()->owner() ||
 605                                 (pit->inInset()->owner()->lyxCode() != InsetOld::TABULAR_CODE &&
 606                                  pit->inInset()->owner()->lyxCode() != InsetOld::ERT_CODE))
 607                     && (pit->layout() != tclass.defaultLayout() ||
 608                         bv()->buffer()->params.paragraph_separation ==
 609                         BufferParams::PARSEP_INDENT)) {
 610                         x += font_metrics::signedWidth(parindent,
 611                                                   tclass.defaultfont());
 612                 } else if (layout->labeltype == LABEL_BIBLIO) {
 613                         // ale970405 Right width for bibitems
 614                         x += bibitemMaxWidth(bv(), tclass.defaultfont());
 615                 }
 616         }
 617
 618         return x;
 619 }
 620
 621
 622 int LyXText::rightMargin(ParagraphList::iterator pit,
 623         Buffer const & buf, Row const & row) const
 624 {
 625         InsetOld * ins;
 626
 627         if (row.pos() < pit->size())
 628                 if ((pit->getChar(row.pos()) == Paragraph::META_INSET) &&
 629                     (ins = pit->getInset(row.pos())) &&
 630                     (ins->needFullRow() || ins->display()))
 631                         return PAPER_MARGIN;
 632
 633         LyXTextClass const & tclass = buf.params.getLyXTextClass();
 634         LyXLayout_ptr const & layout = pit->layout();
 635
 636         return PAPER_MARGIN
 637                 + font_metrics::signedWidth(tclass.rightmargin(),
 638                                        tclass.defaultfont());
 639                 + font_metrics::signedWidth(layout->rightmargin,
 640                                        tclass.defaultfont())
 641                 * 4 / (pit->getDepth() + 4);
 642 }
 643
 644
 645 int LyXText::labelEnd(ParagraphList::iterator pit, Row const & row) const
 646 {
 647         if (pit->layout()->margintype == MARGIN_MANUAL) {
 648                 Row tmprow = row;
 649                 tmprow.pos(pit->size());
 650                 // return the beginning of the body
 651                 return leftMargin(pit, tmprow);
 652         }
 653
 654         // LabelEnd is only needed if the layout
 655         // fills a flushleft label.
 656         return 0;
 657 }
 658
 659
 660 namespace {
 661
 662 // this needs special handling - only newlines count as a break point
 663 pos_type addressBreakPoint(pos_type i, Paragraph const & par)
 664 {
 665         for (; i < par.size(); ++i) {
 666                 if (par.isNewline(i))
 667                         return i;
 668         }
 669
 670         return par.size();
 671 }
 672
 673 };
 674
 675
 676 pos_type LyXText::rowBreakPoint(ParagraphList::iterator pit,
 677         Row const & row) const
 678 {
 679         // maximum pixel width of a row.
 680         int width = workWidth() - rightMargin(pit, *bv()->buffer(), row);
 681
 682         // inset->textWidth() returns -1 via workWidth(),
 683         // but why ?
 684         if (width < 0)
 685                 return pit->size();
 686
 687         LyXLayout_ptr const & layout = pit->layout();
 688
 689         if (layout->margintype == MARGIN_RIGHT_ADDRESS_BOX)
 690                 return addressBreakPoint(row.pos(), *pit);
 691
 692         pos_type const pos = row.pos();
 693         pos_type const body_pos = pit->beginningOfBody();
 694         pos_type const last = pit->size();
 695         pos_type point = last;
 696
 697         if (pos == last)
 698                 return last;
 699
 700         // Now we iterate through until we reach the right margin
 701         // or the end of the par, then choose the possible break
 702         // nearest that.
 703
 704         int const left = leftMargin(pit, row);
 705         int x = left;
 706
 707         // pixel width since last breakpoint
 708         int chunkwidth = 0;
 709         bool fullrow = false;
 710
 711         pos_type i = pos;
 712
 713         // We re-use the font resolution for the entire font span when possible
 714         LyXFont font = getFont(pit, i);
 715         lyx::pos_type endPosOfFontSpan = pit->getEndPosOfFontSpan(i);
 716
 717         for (; i < last; ++i) {
 718                 if (pit->isNewline(i)) {
 719                         point = i;
 720                         break;
 721                 }
 722
 723                 char const c = pit->getChar(i);
 724                 if (i > endPosOfFontSpan) {
 725                         font = getFont(pit, i);
 726                         endPosOfFontSpan = pit->getEndPosOfFontSpan(i);
 727                 }
 728
 729                 int thiswidth;
 730
 731                 // add the auto-hfill from label end to the body
 732                 if (body_pos && i == body_pos) {
 733                         thiswidth = font_metrics::width(layout->labelsep, getLabelFont(pit));
 734                         if (pit->isLineSeparator(i - 1))
 735                                 thiswidth -= singleWidth(pit, i - 1);
 736                         int left_margin = labelEnd(pit, row);
 737                         if (thiswidth + x < left_margin)
 738                                 thiswidth = left_margin - x;
 739                         thiswidth += singleWidth(pit, i, c, font);
 740                 } else {
 741                         thiswidth = singleWidth(pit, i, c, font);
 742                 }
 743
 744                 x += thiswidth;
 745                 chunkwidth += thiswidth;
 746
 747                 InsetOld * in = pit->isInset(i) ? pit->getInset(i) : 0;
 748                 fullrow = in && (in->display() || in->needFullRow());
 749
 750                 // break before a character that will fall off
 751                 // the right of the row
 752                 if (x >= width) {
 753                         // if no break before or we are at an inset
 754                         // that will take up a row, break here
 755                         if (point == last || fullrow || chunkwidth >= (width - left)) {
 756                                 if (pos < i)
 757                                         point = i - 1;
 758                                 else
 759                                         point = i;
 760                         }
 761                         break;
 762                 }
 763
 764                 if (!in || in->isChar()) {
 765                         // some insets are line separators too
 766                         if (pit->isLineSeparator(i)) {
 767                                 point = i;
 768                                 chunkwidth = 0;
 769                         }
 770                         continue;
 771                 }
 772
 773                 if (!fullrow)
 774                         continue;
 775
 776                 // full row insets start at a new row
 777                 if (i == pos) {
 778                         if (pos < last - 1) {
 779                                 point = i;
 780                                 if (pit->isLineSeparator(i + 1))
 781                                         ++point;
 782                         } else {
 783                                 // to avoid extra rows
 784                                 point = last;
 785                         }
 786                 } else {
 787                         point = i - 1;
 788                 }
 789
 790                 return point;
 791         }
 792
 793         if (point == last && x >= width) {
 794                 // didn't find one, break at the point we reached the edge
 795                 point = i;
 796         } else if (i == last && x < width) {
 797                 // found one, but we fell off the end of the par, so prefer
 798                 // that.
 799                 point = last;
 800         }
 801
 802         // manual labels cannot be broken in LaTeX. But we
 803         // want to make our on-screen rendering of footnotes
 804         // etc. still break
 805         if (!fullrow && body_pos && point < body_pos)
 806                 point = body_pos - 1;
 807
 808         return point;
 809 }
 810
 811
 812 // returns the minimum space a row needs on the screen in pixel
 813 int LyXText::fill(ParagraphList::iterator pit,
 814         RowList::iterator row, int paper_width) const
 815 {
 816         if (paper_width < 0)
 817                 return 0;
 818
 819         int w;
 820         // get the pure distance
 821         pos_type const last = lastPrintablePos(*pit, row);
 822
 823         LyXLayout_ptr const & layout = pit->layout();
 824
 825         // special handling of the right address boxes
 826         if (layout->margintype == MARGIN_RIGHT_ADDRESS_BOX) {
 827                 int const tmpfill = row->fill();
 828                 row->fill(0); // the minfill in MarginLeft()
 829                 w = leftMargin(pit, *row);
 830                 row->fill(tmpfill);
 831         } else
 832                 w = leftMargin(pit, *row);
 833
 834         pos_type const body_pos = pit->beginningOfBody();
 835         pos_type i = row->pos();
 836
 837         if (! pit->empty() && i <= last) {
 838                 // We re-use the font resolution for the entire span when possible
 839                 LyXFont font = getFont(pit, i);
 840                 lyx::pos_type endPosOfFontSpan = pit->getEndPosOfFontSpan(i);
 841                 while (i <= last) {
 842                         if (body_pos > 0 && i == body_pos) {
 843                                 w += font_metrics::width(layout->labelsep, getLabelFont(pit));
 844                                 if (pit->isLineSeparator(i - 1))
 845                                         w -= singleWidth(pit, i - 1);
 846                                 int left_margin = labelEnd(pit, *row);
 847                                 if (w < left_margin)
 848                                         w = left_margin;
 849                         }
 850                         char const c = pit->getChar(i);
 851                         if (IsPrintable(c) && i > endPosOfFontSpan) {
 852                                 // We need to get the next font
 853                                 font = getFont(pit, i);
 854                                 endPosOfFontSpan = pit->getEndPosOfFontSpan(i);
 855                         }
 856                         w += singleWidth(pit, i, c, font);
 857                         ++i;
 858                 }
 859         }
 860         if (body_pos > 0 && body_pos > last) {
 861                 w += font_metrics::width(layout->labelsep, getLabelFont(pit));
 862                 if (last >= 0 && pit->isLineSeparator(last))
 863                         w -= singleWidth(pit, last);
 864                 int const left_margin = labelEnd(pit, *row);
 865                 if (w < left_margin)
 866                         w = left_margin;
 867         }
 868
 869         int const fill = paper_width - w - rightMargin(pit, *bv()->buffer(), *row);
 870
 871         // If this case happens, it means that our calculation
 872         // of the widths of the chars when we do rowBreakPoint()
 873         // went wrong for some reason. Typically in list bodies.
 874         // Things just about hobble on anyway, though you'll end
 875         // up with a "fill_separator" less than zero, which corresponds
 876         // to inter-word spacing being too small. Hopefully this problem
 877         // will die when the label hacks die.
 878         if (lyxerr.debugging() && fill < 0) {
 879                 lyxerr[Debug::GUI] << "Eek, fill() was < 0: " << fill
 880                         << " w " << w << " paper_width " << paper_width
 881                         << " right margin " << rightMargin(pit, *bv()->buffer(), *row) << endl;
 882         }
 883         return fill;
 884 }
 885
 886
 887 // returns the minimum space a manual label needs on the screen in pixel
 888 int LyXText::labelFill(ParagraphList::iterator pit, Row const & row) const
 889 {
 890         pos_type last = pit->beginningOfBody();
 891
 892         Assert(last > 0);
 893
 894         // -1 because a label ends either with a space that is in the label,
 895         // or with the beginning of a footnote that is outside the label.
 896         --last;
 897
 898         // a separator at this end does not count
 899         if (pit->isLineSeparator(last))
 900                 --last;
 901
 902         int w = 0;
 903         pos_type i = row.pos();
 904         while (i <= last) {
 905                 w += singleWidth(pit, i);
 906                 ++i;
 907         }
 908
 909         int fill = 0;
 910         string const & labwidstr = pit->params().labelWidthString();
 911         if (!labwidstr.empty()) {
 912                 LyXFont const labfont = getLabelFont(pit);
 913                 int const labwidth = font_metrics::width(labwidstr, labfont);
 914                 fill = max(labwidth - w, 0);
 915         }
 916
 917         return fill;
 918 }
 919
 920
 921 LColor::color LyXText::backgroundColor() const
 922 {
 923         if (inset_owner)
 924                 return inset_owner->backgroundColor();
 925         else
 926                 return LColor::background;
 927 }
 928
 929
 930 void LyXText::setHeightOfRow(ParagraphList::iterator pit, RowList::iterator rit)
 931 {
 932         // get the maximum ascent and the maximum descent
 933         double layoutasc = 0;
 934         double layoutdesc = 0;
 935         double tmptop = 0;
 936
 937         // ok, let us initialize the maxasc and maxdesc value.
 938         // Only the fontsize count. The other properties
 939         // are taken from the layoutfont. Nicer on the screen :)
 940         LyXLayout_ptr const & layout = pit->layout();
 941
 942         // as max get the first character of this row then it can increase but not
 943         // decrease the height. Just some point to start with so we don't have to
 944         // do the assignment below too often.
 945         LyXFont font = getFont(pit, rit->pos());
 946         LyXFont::FONT_SIZE const tmpsize = font.size();
 947         font = getLayoutFont(pit);
 948         LyXFont::FONT_SIZE const size = font.size();
 949         font.setSize(tmpsize);
 950
 951         LyXFont labelfont = getLabelFont(pit);
 952
 953         double spacing_val = 1.0;
 954         if (!pit->params().spacing().isDefault())
 955                 spacing_val = pit->params().spacing().getValue();
 956         else
 957                 spacing_val = bv()->buffer()->params.spacing.getValue();
 958         //lyxerr << "spacing_val = " << spacing_val << endl;
 959
 960         int maxasc  = int(font_metrics::maxAscent(font) *
 961                           layout->spacing.getValue() * spacing_val);
 962         int maxdesc = int(font_metrics::maxDescent(font) *
 963                           layout->spacing.getValue() * spacing_val);
 964
 965         pos_type const pos_end = lastPos(*pit, rit);
 966         int labeladdon = 0;
 967         int maxwidth = 0;
 968
 969         if (!pit->empty()) {
 970                 // We re-use the font resolution for the entire font span when possible
 971                 LyXFont font = getFont(pit, rit->pos());
 972                 lyx::pos_type endPosOfFontSpan = pit->getEndPosOfFontSpan(rit->pos());
 973
 974                 // Optimisation
 975                 Paragraph const & par = *pit;
 976
 977                 // Check if any insets are larger
 978                 for (pos_type pos = rit->pos(); pos <= pos_end; ++pos) {
 979                         // Manual inlined optimised version of common case of
 980                         // "maxwidth += singleWidth(pit, pos);"
 981                         char const c = par.getChar(pos);
 982
 983                         if (IsPrintable(c)) {
 984                                 if (pos > endPosOfFontSpan) {
 985                                         // We need to get the next font
 986                                         font = getFont(pit, pos);
 987                                         endPosOfFontSpan = par.getEndPosOfFontSpan(pos);
 988                                 }
 989                                 if (! font.language()->RightToLeft()) {
 990                                         maxwidth += font_metrics::width(c, font);
 991                                 } else {
 992                                         // Fall-back to normal case
 993                                         maxwidth += singleWidth(pit, pos, c, font);
 994                                         // And flush font cache
 995                                         endPosOfFontSpan = 0;
 996                                 }
 997                         } else {
 998                                 // Special handling of insets - are any larger?
 999                                 if (par.isInset(pos)) {
1000                                         InsetOld const * tmpinset = par.getInset(pos);
1001                                         if (tmpinset) {
1002 #if 1 // this is needed for deep update on initialitation
1003 #warning inset->update FIXME
1004                                                 //tmpinset->update(bv());
1005                                                 LyXFont const tmpfont = getFont(pit, pos);
1006                                                 Dimension dim;
1007                                                 MetricsInfo mi(bv(), tmpfont, workWidth());
1008                                                 tmpinset->metrics(mi, dim);
1009                                                 maxwidth += dim.wid;
1010                                                 maxasc = max(maxasc, dim.asc);
1011                                                 maxdesc = max(maxdesc, dim.des);
1012 #else
1013                                                 maxwidth += tmpinset->width();
1014                                                 maxasc = max(maxasc, tmpinset->ascent());
1015                                                 maxdesc = max(maxdesc, tmpinset->descent());
1016 #endif
1017                                         }
1018                                 } else {
1019                                         // Fall-back to normal case
1020                                         maxwidth += singleWidth(pit, pos, c, font);
1021                                         // And flush font cache
1022                                         endPosOfFontSpan = 0;
1023                                 }
1024                         }
1025                 }
1026         }
1027
1028         // Check if any custom fonts are larger (Asger)
1029         // This is not completely correct, but we can live with the small,
1030         // cosmetic error for now.
1031         LyXFont::FONT_SIZE maxsize =
1032                 pit->highestFontInRange(rit->pos(), pos_end, size);
1033         if (maxsize > font.size()) {
1034                 font.setSize(maxsize);
1035                 maxasc = max(maxasc, font_metrics::maxAscent(font));
1036                 maxdesc = max(maxdesc, font_metrics::maxDescent(font));
1037         }
1038
1039         // This is nicer with box insets:
1040         ++maxasc;
1041         ++maxdesc;
1042
1043         rit->ascent_of_text(maxasc);
1044
1045         // is it a top line?
1046         if (!rit->pos()) {
1047
1048                 // some parksips VERY EASY IMPLEMENTATION
1049                 if (bv()->buffer()->params.paragraph_separation ==
1050                         BufferParams::PARSEP_SKIP)
1051                 {
1052                         if (layout->isParagraph()
1053                                 && pit->getDepth() == 0
1054                                 && pit != ownerParagraphs().begin())
1055                         {
1056                                 maxasc += bv()->buffer()->params.getDefSkip().inPixels(*bv());
1057                         } else if (pit != ownerParagraphs().begin() &&
1058                                    boost::prior(pit)->layout()->isParagraph() &&
1059                                    boost::prior(pit)->getDepth() == 0)
1060                         {
1061                                 // is it right to use defskip here too? (AS)
1062                                 maxasc += bv()->buffer()->params.getDefSkip().inPixels(*bv());
1063                         }
1064                 }
1065
1066                 // the top margin
1067                 if (pit == ownerParagraphs().begin() && !isInInset())
1068                         maxasc += PAPER_MARGIN;
1069
1070                 // add the vertical spaces, that the user added
1071                 maxasc += getLengthMarkerHeight(*bv(), pit->params().spaceTop());
1072
1073                 // do not forget the DTP-lines!
1074                 // there height depends on the font of the nearest character
1075                 if (pit->params().lineTop())
1076
1077                         maxasc += 2 * font_metrics::ascent('x', getFont(pit, 0));
1078                 // and now the pagebreaks
1079                 if (pit->params().pagebreakTop())
1080                         maxasc += 3 * defaultRowHeight();
1081
1082                 if (pit->params().startOfAppendix())
1083                         maxasc += 3 * defaultRowHeight();
1084
1085                 // This is special code for the chapter, since the label of this
1086                 // layout is printed in an extra row
1087                 if (layout->labeltype == LABEL_COUNTER_CHAPTER
1088                         && bv()->buffer()->params.secnumdepth >= 0)
1089                 {
1090                         float spacing_val = 1.0;
1091                         if (!pit->params().spacing().isDefault()) {
1092                                 spacing_val = pit->params().spacing().getValue();
1093                         } else {
1094                                 spacing_val = bv()->buffer()->params.spacing.getValue();
1095                         }
1096
1097                         labeladdon = int(font_metrics::maxDescent(labelfont) *
1098                                          layout->spacing.getValue() *
1099                                          spacing_val)
1100                                 + int(font_metrics::maxAscent(labelfont) *
1101                                       layout->spacing.getValue() *
1102                                       spacing_val);
1103                 }
1104
1105                 // special code for the top label
1106                 if ((layout->labeltype == LABEL_TOP_ENVIRONMENT
1107                      || layout->labeltype == LABEL_BIBLIO
1108                      || layout->labeltype == LABEL_CENTERED_TOP_ENVIRONMENT)
1109                     && isFirstInSequence(pit, ownerParagraphs())
1110                     && !pit->getLabelstring().empty())
1111                 {
1112                         float spacing_val = 1.0;
1113                         if (!pit->params().spacing().isDefault()) {
1114                                 spacing_val = pit->params().spacing().getValue();
1115                         } else {
1116                                 spacing_val = bv()->buffer()->params.spacing.getValue();
1117                         }
1118
1119                         labeladdon = int(
1120                                 (font_metrics::maxAscent(labelfont) +
1121                                  font_metrics::maxDescent(labelfont)) *
1122                                   layout->spacing.getValue() *
1123                                   spacing_val
1124                                 + layout->topsep * defaultRowHeight()
1125                                 + layout->labelbottomsep * defaultRowHeight());
1126                 }
1127
1128                 // And now the layout spaces, for example before and after
1129                 // a section, or between the items of a itemize or enumerate
1130                 // environment.
1131
1132                 if (!pit->params().pagebreakTop()) {
1133                         ParagraphList::iterator prev =
1134                                 depthHook(pit, ownerParagraphs(),
1135                                           pit->getDepth());
1136                         if (prev != pit && prev->layout() == layout &&
1137                                 prev->getDepth() == pit->getDepth() &&
1138                                 prev->getLabelWidthString() == pit->getLabelWidthString())
1139                         {
1140                                 layoutasc = (layout->itemsep * defaultRowHeight());
1141                         } else if (rit != firstRow()) {
1142                                 tmptop = layout->topsep;
1143
1144                                 //if (boost::prior(pit)->getDepth() >= pit->getDepth())
1145                                 //      tmptop -= getPar(previousRow(rit))->layout()->bottomsep;
1146
1147                                 if (tmptop > 0)
1148                                         layoutasc = (tmptop * defaultRowHeight());
1149                         } else if (pit->params().lineTop()) {
1150                                 tmptop = layout->topsep;
1151
1152                                 if (tmptop > 0)
1153                                         layoutasc = (tmptop * defaultRowHeight());
1154                         }
1155
1156                         prev = outerHook(pit, ownerParagraphs());
1157                         if (prev != ownerParagraphs().end())  {
1158                                 maxasc += int(prev->layout()->parsep * defaultRowHeight());
1159                         } else if (pit != ownerParagraphs().begin()) {
1160                                 ParagraphList::iterator prior_pit = boost::prior(pit);
1161                                 if (prior_pit->getDepth() != 0 ||
1162                                     prior_pit->layout() == layout) {
1163                                         maxasc += int(layout->parsep * defaultRowHeight());
1164                                 }
1165                         }
1166                 }
1167         }
1168
1169         // is it a bottom line?
1170         if (boost::next(rit) == pit->rows.end()) {
1171                 // the bottom margin
1172                 ParagraphList::iterator nextpit = boost::next(pit);
1173                 if (nextpit == ownerParagraphs().end() && !isInInset())
1174                         maxdesc += PAPER_MARGIN;
1175
1176                 // add the vertical spaces, that the user added
1177                 maxdesc += getLengthMarkerHeight(*bv(), pit->params().spaceBottom());
1178
1179                 // do not forget the DTP-lines!
1180                 // there height depends on the font of the nearest character
1181                 if (pit->params().lineBottom())
1182                         maxdesc += 2 * font_metrics::ascent('x',
1183                                         getFont(pit, max(pos_type(0), pit->size() - 1)));
1184
1185                 // and now the pagebreaks
1186                 if (pit->params().pagebreakBottom())
1187                         maxdesc += 3 * defaultRowHeight();
1188
1189                 // and now the layout spaces, for example before and after
1190                 // a section, or between the items of a itemize or enumerate
1191                 // environment
1192                 if (!pit->params().pagebreakBottom()
1193                     && nextpit != ownerParagraphs().end()) {
1194                         ParagraphList::iterator comparepit = pit;
1195                         float usual = 0;
1196                         float unusual = 0;
1197
1198                         if (comparepit->getDepth() > nextpit->getDepth()) {
1199                                 usual = (comparepit->layout()->bottomsep * defaultRowHeight());
1200                                 comparepit = depthHook(comparepit, ownerParagraphs(), nextpit->getDepth());
1201                                 if (comparepit->layout()!= nextpit->layout()
1202                                         || nextpit->getLabelWidthString() !=
1203                                         comparepit->getLabelWidthString())
1204                                 {
1205                                         unusual = (comparepit->layout()->bottomsep * defaultRowHeight());
1206                                 }
1207                                 if (unusual > usual)
1208                                         layoutdesc = unusual;
1209                                 else
1210                                         layoutdesc = usual;
1211                         } else if (comparepit->getDepth() ==  nextpit->getDepth()) {
1212
1213                                 if (comparepit->layout() != nextpit->layout()
1214                                         || nextpit->getLabelWidthString() !=
1215                                         comparepit->getLabelWidthString())
1216                                         layoutdesc = int(comparepit->layout()->bottomsep * defaultRowHeight());
1217                         }
1218                 }
1219         }
1220
1221         // incalculate the layout spaces
1222         maxasc += int(layoutasc * 2 / (2 + pit->getDepth()));
1223         maxdesc += int(layoutdesc * 2 / (2 + pit->getDepth()));
1224
1225         // calculate the new height of the text
1226         height -= rit->height();
1227
1228         rit->height(maxasc + maxdesc + labeladdon);
1229         rit->baseline(maxasc + labeladdon);
1230
1231         height += rit->height();
1232
1233         rit->top_of_text(rit->baseline() - font_metrics::maxAscent(font));
1234
1235         double x = 0;
1236         if (layout->margintype != MARGIN_RIGHT_ADDRESS_BOX) {
1237 #warning needed?
1238 #if 0
1239                 // this IS needed
1240                 rit->width(maxwidth);
1241                 double dummy;
1242                 prepareToPrint(pit, rit, x, dummy, dummy, dummy, false);
1243 #endif
1244         }
1245         rit->width(int(maxwidth + x));
1246         if (inset_owner) {
1247                 width = max(0, workWidth());
1248                 RowList::iterator rit = firstRow();
1249                 RowList::iterator end = endRow();
1250                 ParagraphList::iterator it = ownerParagraphs().begin();
1251                 while (rit != end) {
1252                         if (rit->width() > width)
1253                                 width = rit->width();
1254                         nextRow(it, rit);
1255                 }
1256         }
1257 }
1258
1259
1260 void LyXText::breakParagraph(ParagraphList & paragraphs, char keep_layout)
1261 {
1262         // allow only if at start or end, or all previous is new text
1263         if (cursor.pos() && cursor.pos() != cursor.par()->size()
1264                 && cursor.par()->isChangeEdited(0, cursor.pos()))
1265                 return;
1266
1267         LyXTextClass const & tclass =
1268                 bv()->buffer()->params.getLyXTextClass();
1269         LyXLayout_ptr const & layout = cursor.par()->layout();
1270
1271         // this is only allowed, if the current paragraph is not empty or caption
1272         // and if it has not the keepempty flag active
1273         if (cursor.par()->empty() && !cursor.par()->allowEmpty()
1274            && layout->labeltype != LABEL_SENSITIVE)
1275                 return;
1276
1277         recordUndo(bv(), Undo::ATOMIC, cursor.par());
1278
1279         // Always break behind a space
1280         //
1281         // It is better to erase the space (Dekel)
1282         if (cursor.pos() < cursor.par()->size()
1283              && cursor.par()->isLineSeparator(cursor.pos()))
1284            cursor.par()->erase(cursor.pos());
1285
1286         // break the paragraph
1287         if (keep_layout)
1288                 keep_layout = 2;
1289         else
1290                 keep_layout = layout->isEnvironment();
1291
1292         // we need to set this before we insert the paragraph. IMO the
1293         // breakParagraph call should return a bool if it inserts the
1294         // paragraph before or behind and we should react on that one
1295         // but we can fix this in 1.3.0 (Jug 20020509)
1296         bool const isempty = (cursor.par()->allowEmpty() && cursor.par()->empty());
1297         ::breakParagraph(bv()->buffer()->params, paragraphs, cursor.par(),
1298                          cursor.pos(), keep_layout);
1299
1300 #warning Trouble Point! (Lgb)
1301         // When ::breakParagraph is called from within an inset we must
1302         // ensure that the correct ParagraphList is used. Today that is not
1303         // the case and the Buffer::paragraphs is used. Not good. (Lgb)
1304         ParagraphList::iterator next_par = boost::next(cursor.par());
1305
1306         // well this is the caption hack since one caption is really enough
1307         if (layout->labeltype == LABEL_SENSITIVE) {
1308                 if (!cursor.pos())
1309                         // set to standard-layout
1310                         cursor.par()->applyLayout(tclass.defaultLayout());
1311                 else
1312                         // set to standard-layout
1313                         next_par->applyLayout(tclass.defaultLayout());
1314         }
1315
1316         // if the cursor is at the beginning of a row without prior newline,
1317         // move one row up!
1318         // This touches only the screen-update. Otherwise we would may have
1319         // an empty row on the screen
1320         if (cursor.pos() && cursorRow()->pos() == cursor.pos()
1321             && !cursor.par()->isNewline(cursor.pos() - 1))
1322         {
1323                 cursorLeft(bv());
1324         }
1325
1326         while (!next_par->empty() && next_par->isNewline(0))
1327                 next_par->erase(0);
1328
1329         updateCounters();
1330         redoParagraph(cursor.par());
1331         redoParagraph(next_par);
1332
1333         // This check is necessary. Otherwise the new empty paragraph will
1334         // be deleted automatically. And it is more friendly for the user!
1335         if (cursor.pos() || isempty)
1336                 setCursor(next_par, 0);
1337         else
1338                 setCursor(cursor.par(), 0);
1339 }
1340
1341
1342 // convenience function
1343 void LyXText::redoParagraph()
1344 {
1345         clearSelection();
1346         redoParagraph(cursor.par());
1347         setCursorIntern(cursor.par(), cursor.pos());
1348 }
1349
1350
1351 // insert a character, moves all the following breaks in the
1352 // same Paragraph one to the right and make a rebreak
1353 void LyXText::insertChar(char c)
1354 {
1355         recordUndo(bv(), Undo::INSERT, cursor.par());
1356
1357         // When the free-spacing option is set for the current layout,
1358         // disable the double-space checking
1359
1360         bool const freeSpacing = cursor.par()->layout()->free_spacing ||
1361                 cursor.par()->isFreeSpacing();
1362
1363         if (lyxrc.auto_number) {
1364                 static string const number_operators = "+-/*";
1365                 static string const number_unary_operators = "+-";
1366                 static string const number_seperators = ".,:";
1367
1368                 if (current_font.number() == LyXFont::ON) {
1369                         if (!IsDigit(c) && !contains(number_operators, c) &&
1370                             !(contains(number_seperators, c) &&
1371                               cursor.pos() >= 1 &&
1372                               cursor.pos() < cursor.par()->size() &&
1373                               getFont(cursor.par(), cursor.pos()).number() == LyXFont::ON &&
1374                               getFont(cursor.par(), cursor.pos() - 1).number() == LyXFont::ON)
1375                            )
1376                                 number(bv()); // Set current_font.number to OFF
1377                 } else if (IsDigit(c) &&
1378                            real_current_font.isVisibleRightToLeft()) {
1379                         number(bv()); // Set current_font.number to ON
1380
1381                         if (cursor.pos() > 0) {
1382                                 char const c = cursor.par()->getChar(cursor.pos() - 1);
1383                                 if (contains(number_unary_operators, c) &&
1384                                     (cursor.pos() == 1 ||
1385                                      cursor.par()->isSeparator(cursor.pos() - 2) ||
1386                                      cursor.par()->isNewline(cursor.pos() - 2))
1387                                   ) {
1388                                         setCharFont(
1389                                                     cursor.par(),
1390                                                     cursor.pos() - 1,
1391                                                     current_font);
1392                                 } else if (contains(number_seperators, c) &&
1393                                            cursor.pos() >= 2 &&
1394                                            getFont(
1395                                                    cursor.par(),
1396                                                    cursor.pos() - 2).number() == LyXFont::ON) {
1397                                         setCharFont(
1398                                                     cursor.par(),
1399                                                     cursor.pos() - 1,
1400                                                     current_font);
1401                                 }
1402                         }
1403                 }
1404         }
1405
1406
1407         // First check, if there will be two blanks together or a blank at
1408         // the beginning of a paragraph.
1409         // I decided to handle blanks like normal characters, the main
1410         // difference are the special checks when calculating the row.fill
1411         // (blank does not count at the end of a row) and the check here
1412
1413         // The bug is triggered when we type in a description environment:
1414         // The current_font is not changed when we go from label to main text
1415         // and it should (along with realtmpfont) when we type the space.
1416         // CHECK There is a bug here! (Asger)
1417
1418         // store the current font.  This is because of the use of cursor
1419         // movements. The moving cursor would refresh the current font
1420         LyXFont realtmpfont = real_current_font;
1421         LyXFont rawtmpfont = current_font;
1422
1423         if (!freeSpacing && IsLineSeparatorChar(c)) {
1424                 if ((cursor.pos() > 0
1425                      && cursor.par()->isLineSeparator(cursor.pos() - 1))
1426                     || (cursor.pos() > 0
1427                         && cursor.par()->isNewline(cursor.pos() - 1))
1428                     || (cursor.pos() == 0)) {
1429                         static bool sent_space_message = false;
1430                         if (!sent_space_message) {
1431                                 if (cursor.pos() == 0)
1432                                         bv()->owner()->message(_("You cannot insert a space at the beginning of a paragraph. Please read the Tutorial."));
1433                                 else
1434                                         bv()->owner()->message(_("You cannot type two spaces this way. Please read the Tutorial."));
1435                                 sent_space_message = true;
1436                         }
1437                         charInserted();
1438                         return;
1439                 }
1440         }
1441
1442         // Here case LyXText::InsertInset already inserted the character
1443         if (c != Paragraph::META_INSET)
1444                 cursor.par()->insertChar(cursor.pos(), c);
1445
1446         setCharFont(cursor.par(), cursor.pos(), rawtmpfont);
1447
1448         current_font = rawtmpfont;
1449         real_current_font = realtmpfont;
1450         redoParagraph(cursor.par());
1451         setCursor(cursor.par(), cursor.pos() + 1, false, cursor.boundary());
1452
1453         charInserted();
1454 }
1455
1456
1457 void LyXText::charInserted()
1458 {
1459         // Here we could call finishUndo for every 20 characters inserted.
1460         // This is from my experience how emacs does it. (Lgb)
1461         static unsigned int counter;
1462         if (counter < 20) {
1463                 ++counter;
1464         } else {
1465                 finishUndo();
1466                 counter = 0;
1467         }
1468 }
1469
1470
1471 void LyXText::prepareToPrint(ParagraphList::iterator pit,
1472            RowList::iterator const rit) const
1473 {
1474         double w = rit->fill();
1475         double fill_hfill = 0;
1476         double fill_label_hfill = 0;
1477         double fill_separator = 0;
1478         double x = 0;
1479
1480         bool const is_rtl =
1481                 pit->isRightToLeftPar(bv()->buffer()->params);
1482         if (is_rtl)
1483                 x = workWidth() > 0 ? rightMargin(pit, *bv()->buffer(), *rit) : 0;
1484         else
1485                 x = workWidth() > 0 ? leftMargin(pit, *rit) : 0;
1486
1487         // is there a manual margin with a manual label
1488         LyXLayout_ptr const & layout = pit->layout();
1489
1490         if (layout->margintype == MARGIN_MANUAL
1491             && layout->labeltype == LABEL_MANUAL) {
1492                 /// We might have real hfills in the label part
1493                 int nlh = numberOfLabelHfills(*pit, rit);
1494
1495                 // A manual label par (e.g. List) has an auto-hfill
1496                 // between the label text and the body of the
1497                 // paragraph too.
1498                 // But we don't want to do this auto hfill if the par
1499                 // is empty.
1500                 if (!pit->empty())
1501                         ++nlh;
1502
1503                 if (nlh && !pit->getLabelWidthString().empty()) {
1504                         fill_label_hfill = labelFill(pit, *rit) / double(nlh);
1505                 }
1506         }
1507
1508         // are there any hfills in the row?
1509         int const nh = numberOfHfills(*pit, rit);
1510
1511         if (nh) {
1512                 if (w > 0)
1513                         fill_hfill = w / nh;
1514         // we don't have to look at the alignment if it is ALIGN_LEFT and
1515         // if the row is already larger then the permitted width as then
1516         // we force the LEFT_ALIGN'edness!
1517         } else if (int(rit->width()) < workWidth()) {
1518                 // is it block, flushleft or flushright?
1519                 // set x how you need it
1520                 int align;
1521                 if (pit->params().align() == LYX_ALIGN_LAYOUT) {
1522                         align = layout->align;
1523                 } else {
1524                         align = pit->params().align();
1525                 }
1526
1527                 // center displayed insets
1528                 InsetOld * inset = 0;
1529                 if (rit->pos() < pit->size()
1530                     && pit->isInset(rit->pos())
1531                     && (inset = pit->getInset(rit->pos()))
1532                     && (inset->display())) // || (inset->scroll() < 0)))
1533                     align = (inset->lyxCode() == InsetOld::MATHMACRO_CODE)
1534                         ? LYX_ALIGN_BLOCK : LYX_ALIGN_CENTER;
1535                 // ERT insets should always be LEFT ALIGNED on screen
1536                 inset = pit->inInset();
1537                 if (inset && inset->owner() &&
1538                         inset->owner()->lyxCode() == InsetOld::ERT_CODE)
1539                 {
1540                         align = LYX_ALIGN_LEFT;
1541                 }
1542
1543                 switch (align) {
1544             case LYX_ALIGN_BLOCK:
1545             {
1546                         int const ns = numberOfSeparators(*pit, rit);
1547                         RowList::iterator next_row = boost::next(rit);
1548                         if (ns
1549                                 && next_row != pit->rows.end()
1550                                 && !pit->isNewline(next_row->pos() - 1)
1551                           && !(pit->isInset(next_row->pos())
1552                                      && pit->getInset(next_row->pos())
1553                                      && pit->getInset(next_row->pos())->display())
1554                                 ) {
1555                                 fill_separator = w / ns;
1556                         } else if (is_rtl) {
1557                                 x += w;
1558                         }
1559                         break;
1560             }
1561             case LYX_ALIGN_RIGHT:
1562                         x += w;
1563                         break;
1564             case LYX_ALIGN_CENTER:
1565                         x += w / 2;
1566                         break;
1567                 }
1568         }
1569
1570         computeBidiTables(pit, bv()->buffer(), rit);
1571         if (is_rtl) {
1572                 pos_type body_pos = pit->beginningOfBody();
1573                 pos_type last = lastPos(*pit, rit);
1574
1575                 if (body_pos > 0 &&
1576                                 (body_pos - 1 > last ||
1577                                  !pit->isLineSeparator(body_pos - 1))) {
1578                         x += font_metrics::width(layout->labelsep, getLabelFont(pit));
1579                         if (body_pos - 1 <= last)
1580                                 x += fill_label_hfill;
1581                 }
1582         }
1583
1584         rit->fill_hfill(fill_hfill);
1585         rit->fill_label_hfill(fill_label_hfill);
1586         rit->fill_separator(fill_separator);
1587         rit->x(x);
1588 }
1589
1590
1591 // important for the screen
1592
1593
1594 // the cursor set functions have a special mechanism. When they
1595 // realize, that you left an empty paragraph, they will delete it.
1596 // They also delete the corresponding row
1597
1598 void LyXText::cursorRightOneWord()
1599 {
1600         ::cursorRightOneWord(cursor, ownerParagraphs());
1601         setCursor(cursor.par(), cursor.pos());
1602 }
1603
1604
1605 // Skip initial whitespace at end of word and move cursor to *start*
1606 // of prior word, not to end of next prior word.
1607 void LyXText::cursorLeftOneWord()
1608 {
1609         LyXCursor tmpcursor = cursor;
1610         ::cursorLeftOneWord(tmpcursor, ownerParagraphs());
1611         setCursor(tmpcursor.par(), tmpcursor.pos());
1612 }
1613
1614
1615 void LyXText::selectWord(word_location loc)
1616 {
1617         LyXCursor from = cursor;
1618         LyXCursor to;
1619         ::getWord(from, to, loc, ownerParagraphs());
1620         if (cursor != from)
1621                 setCursor(from.par(), from.pos());
1622         if (to == from)
1623                 return;
1624         selection.cursor = cursor;
1625         setCursor(to.par(), to.pos());
1626         setSelection();
1627 }
1628
1629
1630 // Select the word currently under the cursor when no
1631 // selection is currently set
1632 bool LyXText::selectWordWhenUnderCursor(word_location loc)
1633 {
1634         if (!selection.set()) {
1635                 selectWord(loc);
1636                 return selection.set();
1637         }
1638         return false;
1639 }
1640
1641
1642 void LyXText::acceptChange()
1643 {
1644         if (!selection.set() && cursor.par()->size())
1645                 return;
1646
1647         if (selection.start.par() == selection.end.par()) {
1648                 LyXCursor & startc = selection.start;
1649                 LyXCursor & endc = selection.end;
1650                 recordUndo(bv(), Undo::INSERT, startc.par());
1651                 startc.par()->acceptChange(startc.pos(), endc.pos());
1652                 finishUndo();
1653                 clearSelection();
1654                 redoParagraph(startc.par());
1655                 setCursorIntern(startc.par(), 0);
1656         }
1657 #warning handle multi par selection
1658 }
1659
1660
1661 void LyXText::rejectChange()
1662 {
1663         if (!selection.set() && cursor.par()->size())
1664                 return;
1665
1666         if (selection.start.par() == selection.end.par()) {
1667                 LyXCursor & startc = selection.start;
1668                 LyXCursor & endc = selection.end;
1669                 recordUndo(bv(), Undo::INSERT, startc.par());
1670                 startc.par()->rejectChange(startc.pos(), endc.pos());
1671                 finishUndo();
1672                 clearSelection();
1673                 redoParagraph(startc.par());
1674                 setCursorIntern(startc.par(), 0);
1675         }
1676 #warning handle multi par selection
1677 }
1678
1679
1680 // This function is only used by the spellchecker for NextWord().
1681 // It doesn't handle LYX_ACCENTs and probably never will.
1682 WordLangTuple const
1683 LyXText::selectNextWordToSpellcheck(float & value)
1684 {
1685         if (the_locking_inset) {
1686                 WordLangTuple word = the_locking_inset->selectNextWordToSpellcheck(bv(), value);
1687                 if (!word.word().empty()) {
1688                         value += float(cursor.y());
1689                         value /= float(height);
1690                         return word;
1691                 }
1692                 // we have to go on checking so move cursor to the next char
1693                 if (cursor.pos() == cursor.par()->size()) {
1694                         if (boost::next(cursor.par()) == ownerParagraphs().end())
1695                                 return word;
1696                         cursor.par(boost::next(cursor.par()));
1697                         cursor.pos(0);
1698                 } else
1699                         cursor.pos(cursor.pos() + 1);
1700         }
1701         ParagraphList::iterator tmppit = cursor.par();
1702
1703         // If this is not the very first word, skip rest of
1704         // current word because we are probably in the middle
1705         // of a word if there is text here.
1706         if (cursor.pos() || cursor.par() != ownerParagraphs().begin()) {
1707                 while (cursor.pos() < cursor.par()->size()
1708                        && cursor.par()->isLetter(cursor.pos()))
1709                         cursor.pos(cursor.pos() + 1);
1710         }
1711
1712         // Now, skip until we have real text (will jump paragraphs)
1713         while (true) {
1714                 ParagraphList::iterator cpit = cursor.par();
1715                 pos_type const cpos(cursor.pos());
1716
1717                 if (cpos == cpit->size()) {
1718                         if (boost::next(cpit) != ownerParagraphs().end()) {
1719                                 cursor.par(boost::next(cpit));
1720                                 cursor.pos(0);
1721                                 continue;
1722                         }
1723                         break;
1724                 }
1725
1726                 bool const is_good_inset = cpit->isInset(cpos)
1727                         && cpit->getInset(cpos)->allowSpellcheck();
1728
1729                 if (!isDeletedText(*cpit, cpos)
1730                     && (is_good_inset || cpit->isLetter(cpos)))
1731                         break;
1732
1733                 cursor.pos(cpos + 1);
1734         }
1735
1736         // now check if we hit an inset so it has to be a inset containing text!
1737         if (cursor.pos() < cursor.par()->size() &&
1738             cursor.par()->isInset(cursor.pos())) {
1739                 // lock the inset!
1740                 FuncRequest cmd(bv(), LFUN_INSET_EDIT, "left");
1741                 cursor.par()->getInset(cursor.pos())->localDispatch(cmd);
1742                 // now call us again to do the above trick
1743                 // but obviously we have to start from down below ;)
1744                 return bv()->text->selectNextWordToSpellcheck(value);
1745         }
1746
1747         // Update the value if we changed paragraphs
1748         if (cursor.par() != tmppit) {
1749                 setCursor(cursor.par(), cursor.pos());
1750                 value = float(cursor.y())/float(height);
1751         }
1752
1753         // Start the selection from here
1754         selection.cursor = cursor;
1755
1756         string lang_code = getFont(cursor.par(), cursor.pos()).language()->code();
1757         // and find the end of the word (insets like optional hyphens
1758         // and ligature break are part of a word)
1759         while (cursor.pos() < cursor.par()->size()
1760                && cursor.par()->isLetter(cursor.pos())
1761                && !isDeletedText(*cursor.par(), cursor.pos()))
1762                 cursor.pos(cursor.pos() + 1);
1763
1764         // Finally, we copy the word to a string and return it
1765         string str;
1766         if (selection.cursor.pos() < cursor.pos()) {
1767                 pos_type i;
1768                 for (i = selection.cursor.pos(); i < cursor.pos(); ++i) {
1769                         if (!cursor.par()->isInset(i))
1770                                 str += cursor.par()->getChar(i);
1771                 }
1772         }
1773         return WordLangTuple(str, lang_code);
1774 }
1775
1776
1777 // This one is also only for the spellchecker
1778 void LyXText::selectSelectedWord()
1779 {
1780         if (the_locking_inset) {
1781                 the_locking_inset->selectSelectedWord(bv());
1782                 return;
1783         }
1784         // move cursor to the beginning
1785         setCursor(selection.cursor.par(), selection.cursor.pos());
1786
1787         // set the sel cursor
1788         selection.cursor = cursor;
1789
1790         // now find the end of the word
1791         while (cursor.pos() < cursor.par()->size()
1792                && cursor.par()->isLetter(cursor.pos()))
1793                 cursor.pos(cursor.pos() + 1);
1794
1795         setCursor(cursor.par(), cursor.pos());
1796
1797         // finally set the selection
1798         setSelection();
1799 }
1800
1801
1802 // Delete from cursor up to the end of the current or next word.
1803 void LyXText::deleteWordForward()
1804 {
1805         if (cursor.par()->empty())
1806                 cursorRight(bv());
1807         else {
1808                 LyXCursor tmpcursor = cursor;
1809                 selection.set(true); // to avoid deletion
1810                 cursorRightOneWord();
1811                 setCursor(tmpcursor, tmpcursor.par(), tmpcursor.pos());
1812                 selection.cursor = cursor;
1813                 cursor = tmpcursor;
1814                 setSelection();
1815
1816                 // Great, CutSelection() gets rid of multiple spaces.
1817                 cutSelection(true, false);
1818         }
1819 }
1820
1821
1822 // Delete from cursor to start of current or prior word.
1823 void LyXText::deleteWordBackward()
1824 {
1825         if (cursor.par()->empty())
1826                 cursorLeft(bv());
1827         else {
1828                 LyXCursor tmpcursor = cursor;
1829                 selection.set(true); // to avoid deletion
1830                 cursorLeftOneWord();
1831                 setCursor(tmpcursor, tmpcursor.par(), tmpcursor.pos());
1832                 selection.cursor = cursor;
1833                 cursor = tmpcursor;
1834                 setSelection();
1835                 cutSelection(true, false);
1836         }
1837 }
1838
1839
1840 // Kill to end of line.
1841 void LyXText::deleteLineForward()
1842 {
1843         if (cursor.par()->empty())
1844                 // Paragraph is empty, so we just go to the right
1845                 cursorRight(bv());
1846         else {
1847                 LyXCursor tmpcursor = cursor;
1848                 // We can't store the row over a regular setCursor
1849                 // so we set it to 0 and reset it afterwards.
1850                 selection.set(true); // to avoid deletion
1851                 cursorEnd();
1852                 setCursor(tmpcursor, tmpcursor.par(), tmpcursor.pos());
1853                 selection.cursor = cursor;
1854                 cursor = tmpcursor;
1855                 setSelection();
1856                 // What is this test for ??? (JMarc)
1857                 if (!selection.set()) {
1858                         deleteWordForward();
1859                 } else {
1860                         cutSelection(true, false);
1861                 }
1862         }
1863 }
1864
1865
1866 void LyXText::changeCase(LyXText::TextCase action)
1867 {
1868         LyXCursor from;
1869         LyXCursor to;
1870
1871         if (selection.set()) {
1872                 from = selection.start;
1873                 to = selection.end;
1874         } else {
1875                 from = cursor;
1876                 ::getWord(from, to, lyx::PARTIAL_WORD, ownerParagraphs());
1877                 setCursor(to.par(), to.pos() + 1);
1878         }
1879
1880         recordUndo(bv(), Undo::ATOMIC, from.par(), to.par());
1881
1882         pos_type pos = from.pos();
1883         ParagraphList::iterator pit = from.par();
1884
1885         while (pit != ownerParagraphs().end() &&
1886                (pos != to.pos() || pit != to.par())) {
1887                 if (pos == pit->size()) {
1888                         ++pit;
1889                         pos = 0;
1890                         continue;
1891                 }
1892                 unsigned char c = pit->getChar(pos);
1893                 if (!IsInsetChar(c)) {
1894                         switch (action) {
1895                         case text_lowercase:
1896                                 c = lowercase(c);
1897                                 break;
1898                         case text_capitalization:
1899                                 c = uppercase(c);
1900                                 action = text_lowercase;
1901                                 break;
1902                         case text_uppercase:
1903                                 c = uppercase(c);
1904                                 break;
1905                         }
1906                 }
1907 #warning changes
1908                 pit->setChar(pos, c);
1909                 ++pos;
1910         }
1911 }
1912
1913
1914 void LyXText::Delete()
1915 {
1916         // this is a very easy implementation
1917
1918         LyXCursor old_cursor = cursor;
1919         int const old_cur_par_id = old_cursor.par()->id();
1920         int const old_cur_par_prev_id =
1921                 (old_cursor.par() != ownerParagraphs().begin() ?
1922                  boost::prior(old_cursor.par())->id() : -1);
1923
1924         // just move to the right
1925         cursorRight(bv());
1926
1927         // CHECK Look at the comment here.
1928         // This check is not very good...
1929         // The cursorRightIntern calls DeleteEmptyParagrapgMechanism
1930         // and that can very well delete the par or par->previous in
1931         // old_cursor. Will a solution where we compare paragraph id's
1932         //work better?
1933         if ((cursor.par() != ownerParagraphs().begin() ? boost::prior(cursor.par())->id() : -1)
1934             == old_cur_par_prev_id
1935             && cursor.par()->id() != old_cur_par_id) {
1936                 // delete-empty-paragraph-mechanism has done it
1937                 return;
1938         }
1939
1940         // if you had success make a backspace
1941         if (old_cursor.par() != cursor.par() || old_cursor.pos() != cursor.pos()) {
1942                 LyXCursor tmpcursor = cursor;
1943                 // to make sure undo gets the right cursor position
1944                 cursor = old_cursor;
1945                 recordUndo(bv(), Undo::DELETE, cursor.par());
1946                 cursor = tmpcursor;
1947                 backspace();
1948         }
1949 }
1950
1951
1952 void LyXText::backspace()
1953 {
1954         // Get the font that is used to calculate the baselineskip
1955         pos_type lastpos = cursor.par()->size();
1956
1957         if (cursor.pos() == 0) {
1958                 // The cursor is at the beginning of a paragraph,
1959                 // so the the backspace will collapse two paragraphs into one.
1960
1961                 // but it's not allowed unless it's new
1962                 if (cursor.par()->isChangeEdited(0, cursor.par()->size()))
1963                         return;
1964
1965                 // we may paste some paragraphs
1966
1967                 // is it an empty paragraph?
1968
1969                 if (lastpos == 0
1970                      || (lastpos == 1 && cursor.par()->isSeparator(0))) {
1971                         // This is an empty paragraph and we delete it just
1972                         // by moving the cursor one step
1973                         // left and let the DeleteEmptyParagraphMechanism
1974                         // handle the actual deletion of the paragraph.
1975
1976                         if (cursor.par() != ownerParagraphs().begin()) {
1977                                 ParagraphList::iterator tmppit = boost::prior(cursor.par());
1978                                 if (cursor.par()->layout() == tmppit->layout()
1979                                     && cursor.par()->getAlign() == tmppit->getAlign()) {
1980                                         // Inherit bottom DTD from the paragraph below.
1981                                         // (the one we are deleting)
1982                                         tmppit->params().lineBottom(cursor.par()->params().lineBottom());
1983                                         tmppit->params().spaceBottom(cursor.par()->params().spaceBottom());
1984                                         tmppit->params().pagebreakBottom(cursor.par()->params().pagebreakBottom());
1985                                 }
1986
1987                                 cursorLeft(bv());
1988
1989                                 // the layout things can change the height of a row !
1990                                 setHeightOfRow(cursor.par(), cursorRow());
1991                                 return;
1992                         }
1993                 }
1994
1995                 if (cursor.par() != ownerParagraphs().begin()) {
1996                         recordUndo(bv(), Undo::DELETE,
1997                                 boost::prior(cursor.par()),
1998                                 cursor.par());
1999                 }
2000
2001                 ParagraphList::iterator tmppit = cursor.par();
2002                 // We used to do cursorLeftIntern() here, but it is
2003                 // not a good idea since it triggers the auto-delete
2004                 // mechanism. So we do a cursorLeftIntern()-lite,
2005                 // without the dreaded mechanism. (JMarc)
2006                 if (cursor.par() != ownerParagraphs().begin()) {
2007                         // steps into the above paragraph.
2008                         setCursorIntern(boost::prior(cursor.par()),
2009                                         boost::prior(cursor.par())->size(),
2010                                         false);
2011                 }
2012
2013                 // Pasting is not allowed, if the paragraphs have different
2014                 // layout. I think it is a real bug of all other
2015                 // word processors to allow it. It confuses the user.
2016                 //Correction: Pasting is always allowed with standard-layout
2017                 LyXTextClass const & tclass =
2018                         bv()->buffer()->params.getLyXTextClass();
2019
2020                 if (cursor.par() != tmppit
2021                     && (cursor.par()->layout() == tmppit->layout()
2022                         || tmppit->layout() == tclass.defaultLayout())
2023                     && cursor.par()->getAlign() == tmppit->getAlign()) {
2024                         mergeParagraph(bv()->buffer()->params,
2025                                 bv()->buffer()->paragraphs, cursor.par());
2026
2027                         if (cursor.pos() && cursor.par()->isSeparator(cursor.pos() - 1))
2028                                 cursor.pos(cursor.pos() - 1);
2029
2030                         // the row may have changed, block, hfills etc.
2031                         updateCounters();
2032                         setCursor(cursor.par(), cursor.pos(), false);
2033                 }
2034         } else {
2035                 // this is the code for a normal backspace, not pasting
2036                 // any paragraphs
2037                 recordUndo(bv(), Undo::DELETE, cursor.par());
2038                 // We used to do cursorLeftIntern() here, but it is
2039                 // not a good idea since it triggers the auto-delete
2040                 // mechanism. So we do a cursorLeftIntern()-lite,
2041                 // without the dreaded mechanism. (JMarc)
2042                 setCursorIntern(cursor.par(), cursor.pos() - 1,
2043                                 false, cursor.boundary());
2044                 cursor.par()->erase(cursor.pos());
2045         }
2046
2047         lastpos = cursor.par()->size();
2048         if (cursor.pos() == lastpos)
2049                 setCurrentFont();
2050
2051         redoParagraph();
2052         setCursor(cursor.par(), cursor.pos(), false, !cursor.boundary());
2053 }
2054
2055
2056 RowList::iterator LyXText::cursorRow() const
2057 {
2058         return getRow(cursor.par(), cursor.pos());
2059 }
2060
2061
2062 RowList::iterator LyXText::getRow(LyXCursor const & cur) const
2063 {
2064         return getRow(cur.par(), cur.pos());
2065 }
2066
2067
2068 RowList::iterator
2069 LyXText::getRow(ParagraphList::iterator pit, pos_type pos) const
2070 {
2071         RowList::iterator rit = pit->rows.begin();
2072         RowList::iterator end = pit->rows.end();
2073
2074 #warning Why is this next thing needed? (Andre)
2075         while (rit != end
2076                      && rit->pos() < pos
2077                      && boost::next(rit) != end
2078                      && boost::next(rit)->pos() <= pos)
2079                 ++rit;
2080
2081         return rit;
2082 }
2083
2084
2085 // returns pointer to a specified row
2086 RowList::iterator
2087 LyXText::getRow(ParagraphList::iterator pit, pos_type pos, int & y) const
2088 {
2089         y = 0;
2090
2091         if (noRows())
2092                 return firstRow();
2093
2094         ParagraphList::iterator it = ownerParagraphs().begin();
2095         for ( ; it != pit; ++it) {
2096                 RowList::iterator beg = it->rows.begin();
2097                 RowList::iterator end = it->rows.end();
2098                 for (RowList::iterator rit = beg; rit != end; ++rit)
2099                         y += rit->height();
2100         }
2101
2102         RowList::iterator rit = pit->rows.begin();
2103         RowList::iterator end = pit->rows.end();
2104         while (rit != end
2105                && rit->pos() < pos
2106                && boost::next(rit) != end
2107                && boost::next(rit)->pos() <= pos) {
2108                 y += rit->height();
2109                 ++rit;
2110         }
2111
2112         return rit;
2113 }
2114
2115
2116 // returns pointer to some fancy row 'below' specified row
2117 RowList::iterator LyXText::cursorIRow() const
2118 {
2119         int y = 0;
2120         return getRow(cursor.par(), cursor.pos(), y);
2121 }
2122
2123
2124 RowList::iterator LyXText::getRowNearY(int & y,
2125         ParagraphList::iterator & pit) const
2126 {
2127         //lyxerr << "getRowNearY: y " << y << endl;
2128         pit = ownerParagraphs().begin();
2129         RowList::iterator rit = firstRow();
2130         RowList::iterator rend = endRow();
2131
2132         for (; rit != rend; nextRow(pit, rit))
2133                 if (rit->y() > y)
2134                         break;
2135
2136         previousRow(pit, rit);
2137         y = rit->y();
2138         return rit;
2139 }
2140
2141
2142 int LyXText::getDepth() const
2143 {
2144         return cursor.par()->getDepth();
2145 }
2146
2147
2148 RowList::iterator LyXText::firstRow() const
2149 {
2150         return ownerParagraphs().front().rows.begin();
2151 }
2152
2153
2154 RowList::iterator LyXText::lastRow() const
2155 {
2156         return boost::prior(endRow());
2157 }
2158
2159
2160 RowList::iterator LyXText::endRow() const
2161 {
2162         return ownerParagraphs().back().rows.end();
2163 }
2164
2165
2166 void LyXText::nextRow(ParagraphList::iterator & pit,
2167         RowList::iterator & rit) const
2168 {
2169         ++rit;
2170         if (rit == pit->rows.end()) {
2171                 ++pit;
2172                 if (pit == ownerParagraphs().end())
2173                         --pit;
2174                 else
2175                         rit = pit->rows.begin();
2176         }
2177 }
2178
2179
2180 void LyXText::previousRow(ParagraphList::iterator & pit,
2181         RowList::iterator & rit) const
2182 {
2183         if (rit != pit->rows.begin())
2184                 --rit;
2185         else {
2186                 Assert(pit != ownerParagraphs().begin());
2187                 --pit;
2188                 rit = boost::prior(pit->rows.end());
2189         }
2190 }
2191
2192
2193 bool LyXText::noRows() const
2194 {
2195         return ownerParagraphs().begin()->rows.empty();
2196 }