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         return singleWidth(pit, pos, c);
 196 }
 197
 198
 199 int LyXText::singleWidth(ParagraphList::iterator pit,
 200                          pos_type pos, char c) const
 201 {
 202         if (pos >= pit->size())
 203                 return 0;
 204
 205         LyXFont const & font = getFont(pit, pos);
 206
 207         // The most common case is handled first (Asger)
 208         if (IsPrintable(c)) {
 209                 if (font.language()->RightToLeft()) {
 210                         if ((lyxrc.font_norm_type == LyXRC::ISO_8859_6_8 ||
 211                              lyxrc.font_norm_type == LyXRC::ISO_10646_1)
 212                             && font.language()->lang() == "arabic") {
 213                                 if (Encodings::IsComposeChar_arabic(c))
 214                                         return 0;
 215                                 else
 216                                         c = transformChar(c, *pit, pos);
 217                         } else if (font.language()->lang() == "hebrew" &&
 218                                  Encodings::IsComposeChar_hebrew(c))
 219                                 return 0;
 220                 }
 221                 return font_metrics::width(c, font);
 222         }
 223
 224         if (c == Paragraph::META_INSET) {
 225                 InsetOld * tmpinset = pit->getInset(pos);
 226                 Assert(tmpinset);
 227                 if (tmpinset->lyxCode() == InsetOld::HFILL_CODE) {
 228                         // Because of the representation as vertical lines
 229                         return 3;
 230                 }
 231                 return tmpinset->width();
 232         }
 233
 234         if (IsSeparatorChar(c))
 235                 c = ' ';
 236         return font_metrics::width(c, font);
 237 }
 238
 239
 240 lyx::pos_type LyXText::log2vis(lyx::pos_type pos) const
 241 {
 242         if (bidi_start == -1)
 243                 return pos;
 244         else
 245                 return log2vis_list[pos - bidi_start];
 246 }
 247
 248
 249 lyx::pos_type LyXText::vis2log(lyx::pos_type pos) const
 250 {
 251         if (bidi_start == -1)
 252                 return pos;
 253         else
 254                 return vis2log_list[pos - bidi_start];
 255 }
 256
 257
 258 lyx::pos_type LyXText::bidi_level(lyx::pos_type pos) const
 259 {
 260         if (bidi_start == -1)
 261                 return 0;
 262         else
 263                 return bidi_levels[pos - bidi_start];
 264 }
 265
 266
 267 bool LyXText::bidi_InRange(lyx::pos_type pos) const
 268 {
 269         return bidi_start == -1 ||
 270                 (bidi_start <= pos && pos <= bidi_end);
 271 }
 272
 273
 274 void LyXText::computeBidiTables(ParagraphList::iterator pit,
 275    Buffer const * buf, RowList::iterator row) const
 276 {
 277         bidi_same_direction = true;
 278         if (!lyxrc.rtl_support) {
 279                 bidi_start = -1;
 280                 return;
 281         }
 282
 283         InsetOld * inset = pit->inInset();
 284         if (inset && inset->owner() &&
 285             inset->owner()->lyxCode() == InsetOld::ERT_CODE) {
 286                 bidi_start = -1;
 287                 return;
 288         }
 289
 290         bidi_start = row->pos();
 291         bidi_end = lastPrintablePos(*pit, row);
 292
 293         if (bidi_start > bidi_end) {
 294                 bidi_start = -1;
 295                 return;
 296         }
 297
 298         if (bidi_end + 2 - bidi_start >
 299             static_cast<pos_type>(log2vis_list.size())) {
 300                 pos_type new_size =
 301                         (bidi_end + 2 - bidi_start < 500) ?
 302                         500 : 2 * (bidi_end + 2 - bidi_start);
 303                 log2vis_list.resize(new_size);
 304                 vis2log_list.resize(new_size);
 305                 bidi_levels.resize(new_size);
 306         }
 307
 308         vis2log_list[bidi_end + 1 - bidi_start] = -1;
 309         log2vis_list[bidi_end + 1 - bidi_start] = -1;
 310
 311         pos_type stack[2];
 312         bool const rtl_par =
 313                 pit->isRightToLeftPar(buf->params);
 314         int level = 0;
 315         bool rtl = false;
 316         bool rtl0 = false;
 317         pos_type const body_pos = pit->beginningOfBody();
 318
 319         for (pos_type lpos = bidi_start; lpos <= bidi_end; ++lpos) {
 320                 bool is_space = pit->isLineSeparator(lpos);
 321                 pos_type const pos =
 322                         (is_space && lpos + 1 <= bidi_end &&
 323                          !pit->isLineSeparator(lpos + 1) &&
 324                          !pit->isNewline(lpos + 1))
 325                         ? lpos + 1 : lpos;
 326                 LyXFont font = pit->getFontSettings(buf->params, pos);
 327                 if (pos != lpos && 0 < lpos && rtl0 && font.isRightToLeft() &&
 328                     font.number() == LyXFont::ON &&
 329                     pit->getFontSettings(buf->params, lpos - 1).number()
 330                     == LyXFont::ON) {
 331                         font = pit->getFontSettings(buf->params, lpos);
 332                         is_space = false;
 333                 }
 334
 335
 336                 bool new_rtl = font.isVisibleRightToLeft();
 337                 bool new_rtl0 = font.isRightToLeft();
 338                 int new_level;
 339
 340                 if (lpos == body_pos - 1
 341                     && row->pos() < body_pos - 1
 342                     && is_space) {
 343                         new_level = (rtl_par) ? 1 : 0;
 344                         new_rtl = new_rtl0 = rtl_par;
 345                 } else if (new_rtl0)
 346                         new_level = (new_rtl) ? 1 : 2;
 347                 else
 348                         new_level = (rtl_par) ? 2 : 0;
 349
 350                 if (is_space && new_level >= level) {
 351                         new_level = level;
 352                         new_rtl = rtl;
 353                         new_rtl0 = rtl0;
 354                 }
 355
 356                 int new_level2 = new_level;
 357
 358                 if (level == new_level && rtl0 != new_rtl0) {
 359                         --new_level2;
 360                         log2vis_list[lpos - bidi_start] = (rtl) ? 1 : -1;
 361                 } else if (level < new_level) {
 362                         log2vis_list[lpos - bidi_start] =  (rtl) ? -1 : 1;
 363                         if (new_level > rtl_par)
 364                                 bidi_same_direction = false;
 365                 } else
 366                         log2vis_list[lpos - bidi_start] = (new_rtl) ? -1 : 1;
 367                 rtl = new_rtl;
 368                 rtl0 = new_rtl0;
 369                 bidi_levels[lpos - bidi_start] = new_level;
 370
 371                 while (level > new_level2) {
 372                         pos_type old_lpos = stack[--level];
 373                         int delta = lpos - old_lpos - 1;
 374                         if (level % 2)
 375                                 delta = -delta;
 376                         log2vis_list[lpos - bidi_start] += delta;
 377                         log2vis_list[old_lpos - bidi_start] += delta;
 378                 }
 379                 while (level < new_level)
 380                         stack[level++] = lpos;
 381         }
 382
 383         while (level > 0) {
 384                 pos_type const old_lpos = stack[--level];
 385                 int delta = bidi_end - old_lpos;
 386                 if (level % 2)
 387                         delta = -delta;
 388                 log2vis_list[old_lpos - bidi_start] += delta;
 389         }
 390
 391         pos_type vpos = bidi_start - 1;
 392         for (pos_type lpos = bidi_start;
 393              lpos <= bidi_end; ++lpos) {
 394                 vpos += log2vis_list[lpos - bidi_start];
 395                 vis2log_list[vpos - bidi_start] = lpos;
 396                 log2vis_list[lpos - bidi_start] = vpos;
 397         }
 398 }
 399
 400
 401 // This method requires a previous call to ComputeBidiTables()
 402 bool LyXText::isBoundary(Buffer const * buf, Paragraph const & par,
 403                          pos_type pos) const
 404 {
 405         if (!lyxrc.rtl_support || pos == 0)
 406                 return false;
 407
 408         if (!bidi_InRange(pos - 1)) {
 409                 /// This can happen if pos is the first char of a row.
 410                 /// Returning false in this case is incorrect!
 411                 return false;
 412         }
 413
 414         bool const rtl = bidi_level(pos - 1) % 2;
 415         bool const rtl2 = bidi_InRange(pos)
 416                 ? bidi_level(pos) % 2
 417                 : par.isRightToLeftPar(buf->params);
 418         return rtl != rtl2;
 419 }
 420
 421
 422 bool LyXText::isBoundary(Buffer const * buf, Paragraph const & par,
 423                          pos_type pos, LyXFont const & font) const
 424 {
 425         if (!lyxrc.rtl_support)
 426                 return false;    // This is just for speedup
 427
 428         bool const rtl = font.isVisibleRightToLeft();
 429         bool const rtl2 = bidi_InRange(pos)
 430                 ? bidi_level(pos) % 2
 431                 : par.isRightToLeftPar(buf->params);
 432         return rtl != rtl2;
 433 }
 434
 435
 436 int LyXText::leftMargin(ParagraphList::iterator pit, Row const & row) const
 437 {
 438         InsetOld * ins;
 439
 440         if (row.pos() < pit->size())
 441                 if (pit->getChar(row.pos()) == Paragraph::META_INSET &&
 442                     (ins = pit->getInset(row.pos())) &&
 443                     (ins->needFullRow() || ins->display()))
 444                         return LEFT_MARGIN;
 445
 446         LyXTextClass const & tclass =
 447                 bv()->buffer()->params.getLyXTextClass();
 448         LyXLayout_ptr const & layout = pit->layout();
 449
 450         string parindent = layout->parindent;
 451
 452         int x = LEFT_MARGIN;
 453
 454         x += font_metrics::signedWidth(tclass.leftmargin(), tclass.defaultfont());
 455
 456         // this is the way, LyX handles the LaTeX-Environments.
 457         // I have had this idea very late, so it seems to be a
 458         // later added hack and this is true
 459         if (!pit->getDepth()) {
 460                 if (pit->layout() == tclass.defaultLayout()) {
 461                         // find the previous same level paragraph
 462                         if (pit != ownerParagraphs().begin()) {
 463                                 ParagraphList::iterator newpit =
 464                                         depthHook(pit, ownerParagraphs(),
 465                                                   pit->getDepth());
 466                                 if (newpit == pit &&
 467                                     newpit->layout()->nextnoindent)
 468                                         parindent.erase();
 469                         }
 470                 }
 471         } else {
 472                 // find the next level paragraph
 473
 474                 ParagraphList::iterator newpar = outerHook(pit,
 475                                                            ownerParagraphs());
 476
 477                 // make a corresponding row. Needed to call leftMargin()
 478
 479                 // check wether it is a sufficent paragraph
 480                 if (newpar != ownerParagraphs().end() &&
 481                     newpar->layout()->isEnvironment()) {
 482                         x = leftMargin(newpar, Row(newpar->size()));
 483                 }
 484
 485                 if (newpar != ownerParagraphs().end() &&
 486                     pit->layout() == tclass.defaultLayout()) {
 487                         if (newpar->params().noindent())
 488                                 parindent.erase();
 489                         else {
 490                                 parindent = newpar->layout()->parindent;
 491                         }
 492
 493                 }
 494         }
 495
 496         LyXFont const labelfont = getLabelFont(pit);
 497         switch (layout->margintype) {
 498         case MARGIN_DYNAMIC:
 499                 if (!layout->leftmargin.empty()) {
 500                         x += font_metrics::signedWidth(layout->leftmargin,
 501                                                   tclass.defaultfont());
 502                 }
 503                 if (!pit->getLabelstring().empty()) {
 504                         x += font_metrics::signedWidth(layout->labelindent,
 505                                                   labelfont);
 506                         x += font_metrics::width(pit->getLabelstring(),
 507                                             labelfont);
 508                         x += font_metrics::width(layout->labelsep, labelfont);
 509                 }
 510                 break;
 511         case MARGIN_MANUAL:
 512                 x += font_metrics::signedWidth(layout->labelindent, labelfont);
 513                 // The width of an empty par, even with manual label, should be 0
 514                 if (!pit->empty() && row.pos() >= pit->beginningOfBody()) {
 515                         if (!pit->getLabelWidthString().empty()) {
 516                                 x += font_metrics::width(pit->getLabelWidthString(),
 517                                                labelfont);
 518                                 x += font_metrics::width(layout->labelsep, labelfont);
 519                         }
 520                 }
 521                 break;
 522         case MARGIN_STATIC:
 523                 x += font_metrics::signedWidth(layout->leftmargin, tclass.defaultfont()) * 4
 524                         / (pit->getDepth() + 4);
 525                 break;
 526         case MARGIN_FIRST_DYNAMIC:
 527                 if (layout->labeltype == LABEL_MANUAL) {
 528                         if (row.pos() >= pit->beginningOfBody()) {
 529                                 x += font_metrics::signedWidth(layout->leftmargin,
 530                                                           labelfont);
 531                         } else {
 532                                 x += font_metrics::signedWidth(layout->labelindent,
 533                                                           labelfont);
 534                         }
 535                 } else if (row.pos()
 536                            // Special case to fix problems with
 537                            // theorems (JMarc)
 538                            || (layout->labeltype == LABEL_STATIC
 539                                && layout->latextype == LATEX_ENVIRONMENT
 540                                && !isFirstInSequence(pit, ownerParagraphs()))) {
 541                         x += font_metrics::signedWidth(layout->leftmargin,
 542                                                   labelfont);
 543                 } else if (layout->labeltype != LABEL_TOP_ENVIRONMENT
 544                            && layout->labeltype != LABEL_BIBLIO
 545                            && layout->labeltype !=
 546                            LABEL_CENTERED_TOP_ENVIRONMENT) {
 547                         x += font_metrics::signedWidth(layout->labelindent,
 548                                                   labelfont);
 549                         x += font_metrics::width(layout->labelsep, labelfont);
 550                         x += font_metrics::width(pit->getLabelstring(),
 551                                             labelfont);
 552                 }
 553                 break;
 554
 555         case MARGIN_RIGHT_ADDRESS_BOX:
 556         {
 557                 // ok, a terrible hack. The left margin depends on the widest
 558                 // row in this paragraph. Do not care about footnotes, they
 559                 // are *NOT* allowed in the LaTeX realisation of this layout.
 560
 561                 // find the first row of this paragraph
 562                 RowList::iterator rit = pit->rows.begin();
 563                 RowList::iterator end = pit->rows.end();
 564                 int minfill = rit->fill();
 565                 for ( ; rit != end; ++rit)
 566                         if (rit->fill() < minfill)
 567                                 minfill = rit->fill();
 568
 569                 x += font_metrics::signedWidth(layout->leftmargin,
 570                         tclass.defaultfont());
 571                 x += minfill;
 572         }
 573         break;
 574         }
 575
 576         if (workWidth() > 0 && !pit->params().leftIndent().zero()) {
 577                 LyXLength const len = pit->params().leftIndent();
 578                 int const tw = inset_owner ?
 579                         inset_owner->latexTextWidth(bv()) : workWidth();
 580                 x += len.inPixels(tw);
 581         }
 582
 583         LyXAlignment align;
 584
 585         if (pit->params().align() == LYX_ALIGN_LAYOUT)
 586                 align = layout->align;
 587         else
 588                 align = pit->params().align();
 589
 590         // set the correct parindent
 591         if (row.pos() == 0) {
 592                 if ((layout->labeltype == LABEL_NO_LABEL
 593                      || layout->labeltype == LABEL_TOP_ENVIRONMENT
 594                      || layout->labeltype == LABEL_CENTERED_TOP_ENVIRONMENT
 595                      || (layout->labeltype == LABEL_STATIC
 596                          && layout->latextype == LATEX_ENVIRONMENT
 597                          && !isFirstInSequence(pit, ownerParagraphs())))
 598                     && align == LYX_ALIGN_BLOCK
 599                     && !pit->params().noindent()
 600                         // in tabulars and ert paragraphs are never indented!
 601                         && (!pit->inInset() || !pit->inInset()->owner() ||
 602                                 (pit->inInset()->owner()->lyxCode() != InsetOld::TABULAR_CODE &&
 603                                  pit->inInset()->owner()->lyxCode() != InsetOld::ERT_CODE))
 604                     && (pit->layout() != tclass.defaultLayout() ||
 605                         bv()->buffer()->params.paragraph_separation ==
 606                         BufferParams::PARSEP_INDENT)) {
 607                         x += font_metrics::signedWidth(parindent,
 608                                                   tclass.defaultfont());
 609                 } else if (layout->labeltype == LABEL_BIBLIO) {
 610                         // ale970405 Right width for bibitems
 611                         x += bibitemMaxWidth(bv(), tclass.defaultfont());
 612                 }
 613         }
 614
 615         return x;
 616 }
 617
 618
 619 int LyXText::rightMargin(ParagraphList::iterator pit,
 620         Buffer const & buf, Row const & row) const
 621 {
 622         InsetOld * ins;
 623
 624         if (row.pos() < pit->size())
 625                 if ((pit->getChar(row.pos()) == Paragraph::META_INSET) &&
 626                     (ins = pit->getInset(row.pos())) &&
 627                     (ins->needFullRow() || ins->display()))
 628                         return PAPER_MARGIN;
 629
 630         LyXTextClass const & tclass = buf.params.getLyXTextClass();
 631         LyXLayout_ptr const & layout = pit->layout();
 632
 633         return PAPER_MARGIN
 634                 + font_metrics::signedWidth(tclass.rightmargin(),
 635                                        tclass.defaultfont());
 636                 + font_metrics::signedWidth(layout->rightmargin,
 637                                        tclass.defaultfont())
 638                 * 4 / (pit->getDepth() + 4);
 639 }
 640
 641
 642 int LyXText::labelEnd(ParagraphList::iterator pit, Row const & row) const
 643 {
 644         if (pit->layout()->margintype == MARGIN_MANUAL) {
 645                 Row tmprow = row;
 646                 tmprow.pos(pit->size());
 647                 // return the beginning of the body
 648                 return leftMargin(pit, tmprow);
 649         }
 650
 651         // LabelEnd is only needed if the layout
 652         // fills a flushleft label.
 653         return 0;
 654 }
 655
 656
 657 namespace {
 658
 659 // this needs special handling - only newlines count as a break point
 660 pos_type addressBreakPoint(pos_type i, Paragraph const & par)
 661 {
 662         for (; i < par.size(); ++i) {
 663                 if (par.isNewline(i))
 664                         return i;
 665         }
 666
 667         return par.size();
 668 }
 669
 670 };
 671
 672
 673 pos_type LyXText::rowBreakPoint(ParagraphList::iterator pit,
 674         Row const & row) const
 675 {
 676         // maximum pixel width of a row.
 677         int width = workWidth() - rightMargin(pit, *bv()->buffer(), row);
 678
 679         // inset->textWidth() returns -1 via workWidth(),
 680         // but why ?
 681         if (width < 0)
 682                 return pit->size();
 683
 684         LyXLayout_ptr const & layout = pit->layout();
 685
 686         if (layout->margintype == MARGIN_RIGHT_ADDRESS_BOX)
 687                 return addressBreakPoint(row.pos(), *pit);
 688
 689         pos_type const pos = row.pos();
 690         pos_type const body_pos = pit->beginningOfBody();
 691         pos_type const last = pit->size();
 692         pos_type point = last;
 693
 694         if (pos == last)
 695                 return last;
 696
 697         // Now we iterate through until we reach the right margin
 698         // or the end of the par, then choose the possible break
 699         // nearest that.
 700
 701         int const left = leftMargin(pit, row);
 702         int x = left;
 703
 704         // pixel width since last breakpoint
 705         int chunkwidth = 0;
 706         bool fullrow = false;
 707
 708         pos_type i = pos;
 709
 710         // We re-use the font resolution for the entire font span when possible
 711         LyXFont font = getFont(pit, i);
 712         lyx::pos_type endPosOfFontSpan = pit->getEndPosOfFontSpan(i);
 713
 714         for (; i < last; ++i) {
 715                 if (pit->isNewline(i)) {
 716                         point = i;
 717                         break;
 718                 }
 719
 720                 char const c = pit->getChar(i);
 721
 722                 int thiswidth;
 723
 724                 // add the auto-hfill from label end to the body
 725                 if (body_pos && i == body_pos) {
 726                         thiswidth = font_metrics::width(layout->labelsep, getLabelFont(pit));
 727                         if (pit->isLineSeparator(i - 1))
 728                                 thiswidth -= singleWidth(pit, i - 1);
 729                         int left_margin = labelEnd(pit, row);
 730                         if (thiswidth + x < left_margin)
 731                                 thiswidth = left_margin - x;
 732                         thiswidth += singleWidth(pit, i, c);
 733                 } else {
 734                         // Manual inlined optimised version of common case of "thiswidth = singleWidth(pit, i, c);"
 735                         if (IsPrintable(c)) {
 736                                 if (pos > endPosOfFontSpan) {
 737                                         // We need to get the next font
 738                                         font = getFont(pit, i);
 739                                         endPosOfFontSpan = pit->getEndPosOfFontSpan(i);
 740                                 }
 741                                 if (! font.language()->RightToLeft()) {
 742                                         thiswidth = font_metrics::width(c, font);
 743                                 } else {
 744                                         // Fall-back to normal case
 745                                         thiswidth = singleWidth(pit, i, c);
 746                                         // And flush font cache
 747                                         endPosOfFontSpan = 0;
 748                                 }
 749                         } else {
 750                                 // Fall-back to normal case
 751                                 thiswidth = singleWidth(pit, i, c);
 752                                 // And flush font cache
 753                                 endPosOfFontSpan = 0;
 754                         }
 755                 }
 756
 757                 x += thiswidth;
 758                 chunkwidth += thiswidth;
 759
 760                 InsetOld * in = pit->isInset(i) ? pit->getInset(i) : 0;
 761                 fullrow = in && (in->display() || in->needFullRow());
 762
 763                 // break before a character that will fall off
 764                 // the right of the row
 765                 if (x >= width) {
 766                         // if no break before or we are at an inset
 767                         // that will take up a row, break here
 768                         if (point == last || fullrow || chunkwidth >= (width - left)) {
 769                                 if (pos < i)
 770                                         point = i - 1;
 771                                 else
 772                                         point = i;
 773                         }
 774                         break;
 775                 }
 776
 777                 if (!in || in->isChar()) {
 778                         // some insets are line separators too
 779                         if (pit->isLineSeparator(i)) {
 780                                 point = i;
 781                                 chunkwidth = 0;
 782                         }
 783                         continue;
 784                 }
 785
 786                 if (!fullrow)
 787                         continue;
 788
 789                 // full row insets start at a new row
 790                 if (i == pos) {
 791                         if (pos < last - 1) {
 792                                 point = i;
 793                                 if (pit->isLineSeparator(i + 1))
 794                                         ++point;
 795                         } else {
 796                                 // to avoid extra rows
 797                                 point = last;
 798                         }
 799                 } else {
 800                         point = i - 1;
 801                 }
 802
 803                 return point;
 804         }
 805
 806         if (point == last && x >= width) {
 807                 // didn't find one, break at the point we reached the edge
 808                 point = i;
 809         } else if (i == last && x < width) {
 810                 // found one, but we fell off the end of the par, so prefer
 811                 // that.
 812                 point = last;
 813         }
 814
 815         // manual labels cannot be broken in LaTeX. But we
 816         // want to make our on-screen rendering of footnotes
 817         // etc. still break
 818         if (!fullrow && body_pos && point < body_pos)
 819                 point = body_pos - 1;
 820
 821         return point;
 822 }
 823
 824
 825 // returns the minimum space a row needs on the screen in pixel
 826 int LyXText::fill(ParagraphList::iterator pit,
 827         RowList::iterator row, int paper_width) const
 828 {
 829         if (paper_width < 0)
 830                 return 0;
 831
 832         int w;
 833         // get the pure distance
 834         pos_type const last = lastPrintablePos(*pit, row);
 835
 836         LyXLayout_ptr const & layout = pit->layout();
 837
 838         // special handling of the right address boxes
 839         if (layout->margintype == MARGIN_RIGHT_ADDRESS_BOX) {
 840                 int const tmpfill = row->fill();
 841                 row->fill(0); // the minfill in MarginLeft()
 842                 w = leftMargin(pit, *row);
 843                 row->fill(tmpfill);
 844         } else
 845                 w = leftMargin(pit, *row);
 846
 847         pos_type const body_pos = pit->beginningOfBody();
 848         pos_type i = row->pos();
 849
 850         if (! pit->empty() && i <= last) {
 851                 // We re-use the font resolution for the entire span when possible
 852                 LyXFont font = getFont(pit, i);
 853                 lyx::pos_type endPosOfFontSpan = pit->getEndPosOfFontSpan(i);
 854                 while (i <= last) {
 855                         if (body_pos > 0 && i == body_pos) {
 856                                 w += font_metrics::width(layout->labelsep, getLabelFont(pit));
 857                                 if (pit->isLineSeparator(i - 1))
 858                                         w -= singleWidth(pit, i - 1);
 859                                 int left_margin = labelEnd(pit, *row);
 860                                 if (w < left_margin)
 861                                         w = left_margin;
 862                         }
 863                         { // Manual inlined an optimised version of the common case of "w += singleWidth(pit, i);"
 864                                 char const c = pit->getChar(i);
 865
 866                                 if (IsPrintable(c)) {
 867                                         if (i > endPosOfFontSpan) {
 868                                                 // We need to get the next font
 869                                                 font = getFont(pit, i);
 870                                                 endPosOfFontSpan = pit->getEndPosOfFontSpan(i);
 871                                         }
 872                                         if (!font.language()->RightToLeft()) {
 873                                                 w += font_metrics::width(c, font);
 874                                         } else {
 875                                                 // Fall-back to the normal case
 876                                                 w += singleWidth(pit, i, c);
 877                                                 // And flush font cache
 878                                                 endPosOfFontSpan = 0;
 879                                         }
 880                                 } else {
 881                                         // Fall-back to the normal case
 882                                         w += singleWidth(pit, i, c);
 883                                         // And flush font cache
 884                                         endPosOfFontSpan = 0;
 885                                 }
 886                         }
 887                         ++i;
 888                 }
 889         }
 890         if (body_pos > 0 && body_pos > last) {
 891                 w += font_metrics::width(layout->labelsep, getLabelFont(pit));
 892                 if (last >= 0 && pit->isLineSeparator(last))
 893                         w -= singleWidth(pit, last);
 894                 int const left_margin = labelEnd(pit, *row);
 895                 if (w < left_margin)
 896                         w = left_margin;
 897         }
 898
 899         int const fill = paper_width - w - rightMargin(pit, *bv()->buffer(), *row);
 900
 901         // If this case happens, it means that our calculation
 902         // of the widths of the chars when we do rowBreakPoint()
 903         // went wrong for some reason. Typically in list bodies.
 904         // Things just about hobble on anyway, though you'll end
 905         // up with a "fill_separator" less than zero, which corresponds
 906         // to inter-word spacing being too small. Hopefully this problem
 907         // will die when the label hacks die.
 908         if (lyxerr.debugging() && fill < 0) {
 909                 lyxerr[Debug::GUI] << "Eek, fill() was < 0: " << fill
 910                         << " w " << w << " paper_width " << paper_width
 911                         << " right margin " << rightMargin(pit, *bv()->buffer(), *row) << endl;
 912         }
 913         return fill;
 914 }
 915
 916
 917 // returns the minimum space a manual label needs on the screen in pixel
 918 int LyXText::labelFill(ParagraphList::iterator pit, Row const & row) const
 919 {
 920         pos_type last = pit->beginningOfBody();
 921
 922         Assert(last > 0);
 923
 924         // -1 because a label ends either with a space that is in the label,
 925         // or with the beginning of a footnote that is outside the label.
 926         --last;
 927
 928         // a separator at this end does not count
 929         if (pit->isLineSeparator(last))
 930                 --last;
 931
 932         int w = 0;
 933         pos_type i = row.pos();
 934         while (i <= last) {
 935                 w += singleWidth(pit, i);
 936                 ++i;
 937         }
 938
 939         int fill = 0;
 940         string const & labwidstr = pit->params().labelWidthString();
 941         if (!labwidstr.empty()) {
 942                 LyXFont const labfont = getLabelFont(pit);
 943                 int const labwidth = font_metrics::width(labwidstr, labfont);
 944                 fill = max(labwidth - w, 0);
 945         }
 946
 947         return fill;
 948 }
 949
 950
 951 LColor::color LyXText::backgroundColor() const
 952 {
 953         if (inset_owner)
 954                 return inset_owner->backgroundColor();
 955         else
 956                 return LColor::background;
 957 }
 958
 959
 960 void LyXText::setHeightOfRow(ParagraphList::iterator pit, RowList::iterator rit)
 961 {
 962         // get the maximum ascent and the maximum descent
 963         double layoutasc = 0;
 964         double layoutdesc = 0;
 965         double tmptop = 0;
 966
 967         // ok, let us initialize the maxasc and maxdesc value.
 968         // Only the fontsize count. The other properties
 969         // are taken from the layoutfont. Nicer on the screen :)
 970         LyXLayout_ptr const & layout = pit->layout();
 971
 972         // as max get the first character of this row then it can increase but not
 973         // decrease the height. Just some point to start with so we don't have to
 974         // do the assignment below too often.
 975         LyXFont font = getFont(pit, rit->pos());
 976         LyXFont::FONT_SIZE const tmpsize = font.size();
 977         font = getLayoutFont(pit);
 978         LyXFont::FONT_SIZE const size = font.size();
 979         font.setSize(tmpsize);
 980
 981         LyXFont labelfont = getLabelFont(pit);
 982
 983         double spacing_val = 1.0;
 984         if (!pit->params().spacing().isDefault())
 985                 spacing_val = pit->params().spacing().getValue();
 986         else
 987                 spacing_val = bv()->buffer()->params.spacing.getValue();
 988         //lyxerr << "spacing_val = " << spacing_val << endl;
 989
 990         int maxasc  = int(font_metrics::maxAscent(font) *
 991                           layout->spacing.getValue() * spacing_val);
 992         int maxdesc = int(font_metrics::maxDescent(font) *
 993                           layout->spacing.getValue() * spacing_val);
 994
 995         pos_type const pos_end = lastPos(*pit, rit);
 996         int labeladdon = 0;
 997         int maxwidth = 0;
 998
 999         if (!pit->empty()) {
1000                 // We re-use the font resolution for the entire font span when possible
1001                 LyXFont font = getFont(pit, rit->pos());
1002                 lyx::pos_type endPosOfFontSpan = pit->getEndPosOfFontSpan(rit->pos());
1003
1004                 // Optimisation
1005                 Paragraph const & par = *pit;
1006
1007                 // Check if any insets are larger
1008                 for (pos_type pos = rit->pos(); pos <= pos_end; ++pos) {
1009                         // Manual inlined optimised version of common case of
1010                         // "maxwidth += singleWidth(pit, pos);"
1011                         char const c = par.getChar(pos);
1012
1013                         if (IsPrintable(c)) {
1014                                 if (pos > endPosOfFontSpan) {
1015                                         // We need to get the next font
1016                                         font = getFont(pit, pos);
1017                                         endPosOfFontSpan = par.getEndPosOfFontSpan(pos);
1018                                 }
1019                                 if (! font.language()->RightToLeft()) {
1020                                         maxwidth += font_metrics::width(c, font);
1021                                 } else {
1022                                         // Fall-back to normal case
1023                                         maxwidth += singleWidth(pit, pos, c);
1024                                         // And flush font cache
1025                                         endPosOfFontSpan = 0;
1026                                 }
1027                         } else {
1028                                 // Special handling of insets - are any larger?
1029                                 if (par.isInset(pos)) {
1030                                         InsetOld const * tmpinset = par.getInset(pos);
1031                                         if (tmpinset) {
1032 #if 1 // this is needed for deep update on initialitation
1033 #warning inset->update FIXME
1034                                                 //tmpinset->update(bv());
1035                                                 LyXFont const tmpfont = getFont(pit, pos);
1036                                                 Dimension dim;
1037                                                 MetricsInfo mi(bv(), tmpfont, workWidth());
1038                                                 tmpinset->metrics(mi, dim);
1039                                                 maxwidth += dim.wid;
1040                                                 maxasc = max(maxasc, dim.asc);
1041                                                 maxdesc = max(maxdesc, dim.des);
1042 #else
1043                                                 maxwidth += tmpinset->width();
1044                                                 maxasc = max(maxasc, tmpinset->ascent());
1045                                                 maxdesc = max(maxdesc, tmpinset->descent());
1046 #endif
1047                                         }
1048                                 } else {
1049                                         // Fall-back to normal case
1050                                         maxwidth += singleWidth(pit, pos, c);
1051                                         // And flush font cache
1052                                         endPosOfFontSpan = 0;
1053                                 }
1054                         }
1055                 }
1056         }
1057
1058         // Check if any custom fonts are larger (Asger)
1059         // This is not completely correct, but we can live with the small,
1060         // cosmetic error for now.
1061         LyXFont::FONT_SIZE maxsize =
1062                 pit->highestFontInRange(rit->pos(), pos_end, size);
1063         if (maxsize > font.size()) {
1064                 font.setSize(maxsize);
1065                 maxasc = max(maxasc, font_metrics::maxAscent(font));
1066                 maxdesc = max(maxdesc, font_metrics::maxDescent(font));
1067         }
1068
1069         // This is nicer with box insets:
1070         ++maxasc;
1071         ++maxdesc;
1072
1073         rit->ascent_of_text(maxasc);
1074
1075         // is it a top line?
1076         if (!rit->pos()) {
1077
1078                 // some parksips VERY EASY IMPLEMENTATION
1079                 if (bv()->buffer()->params.paragraph_separation ==
1080                         BufferParams::PARSEP_SKIP)
1081                 {
1082                         if (layout->isParagraph()
1083                                 && pit->getDepth() == 0
1084                                 && pit != ownerParagraphs().begin())
1085                         {
1086                                 maxasc += bv()->buffer()->params.getDefSkip().inPixels(*bv());
1087                         } else if (pit != ownerParagraphs().begin() &&
1088                                    boost::prior(pit)->layout()->isParagraph() &&
1089                                    boost::prior(pit)->getDepth() == 0)
1090                         {
1091                                 // is it right to use defskip here too? (AS)
1092                                 maxasc += bv()->buffer()->params.getDefSkip().inPixels(*bv());
1093                         }
1094                 }
1095
1096                 // the top margin
1097                 if (pit == ownerParagraphs().begin() && !isInInset())
1098                         maxasc += PAPER_MARGIN;
1099
1100                 // add the vertical spaces, that the user added
1101                 maxasc += getLengthMarkerHeight(*bv(), pit->params().spaceTop());
1102
1103                 // do not forget the DTP-lines!
1104                 // there height depends on the font of the nearest character
1105                 if (pit->params().lineTop())
1106
1107                         maxasc += 2 * font_metrics::ascent('x', getFont(pit, 0));
1108                 // and now the pagebreaks
1109                 if (pit->params().pagebreakTop())
1110                         maxasc += 3 * defaultRowHeight();
1111
1112                 if (pit->params().startOfAppendix())
1113                         maxasc += 3 * defaultRowHeight();
1114
1115                 // This is special code for the chapter, since the label of this
1116                 // layout is printed in an extra row
1117                 if (layout->labeltype == LABEL_COUNTER_CHAPTER
1118                         && bv()->buffer()->params.secnumdepth >= 0)
1119                 {
1120                         float spacing_val = 1.0;
1121                         if (!pit->params().spacing().isDefault()) {
1122                                 spacing_val = pit->params().spacing().getValue();
1123                         } else {
1124                                 spacing_val = bv()->buffer()->params.spacing.getValue();
1125                         }
1126
1127                         labeladdon = int(font_metrics::maxDescent(labelfont) *
1128                                          layout->spacing.getValue() *
1129                                          spacing_val)
1130                                 + int(font_metrics::maxAscent(labelfont) *
1131                                       layout->spacing.getValue() *
1132                                       spacing_val);
1133                 }
1134
1135                 // special code for the top label
1136                 if ((layout->labeltype == LABEL_TOP_ENVIRONMENT
1137                      || layout->labeltype == LABEL_BIBLIO
1138                      || layout->labeltype == LABEL_CENTERED_TOP_ENVIRONMENT)
1139                     && isFirstInSequence(pit, ownerParagraphs())
1140                     && !pit->getLabelstring().empty())
1141                 {
1142                         float spacing_val = 1.0;
1143                         if (!pit->params().spacing().isDefault()) {
1144                                 spacing_val = pit->params().spacing().getValue();
1145                         } else {
1146                                 spacing_val = bv()->buffer()->params.spacing.getValue();
1147                         }
1148
1149                         labeladdon = int(
1150                                 (font_metrics::maxAscent(labelfont) +
1151                                  font_metrics::maxDescent(labelfont)) *
1152                                   layout->spacing.getValue() *
1153                                   spacing_val
1154                                 + layout->topsep * defaultRowHeight()
1155                                 + layout->labelbottomsep * defaultRowHeight());
1156                 }
1157
1158                 // And now the layout spaces, for example before and after
1159                 // a section, or between the items of a itemize or enumerate
1160                 // environment.
1161
1162                 if (!pit->params().pagebreakTop()) {
1163                         ParagraphList::iterator prev =
1164                                 depthHook(pit, ownerParagraphs(),
1165                                           pit->getDepth());
1166                         if (prev != pit && prev->layout() == layout &&
1167                                 prev->getDepth() == pit->getDepth() &&
1168                                 prev->getLabelWidthString() == pit->getLabelWidthString())
1169                         {
1170                                 layoutasc = (layout->itemsep * defaultRowHeight());
1171                         } else if (rit != firstRow()) {
1172                                 tmptop = layout->topsep;
1173
1174                                 //if (boost::prior(pit)->getDepth() >= pit->getDepth())
1175                                 //      tmptop -= getPar(previousRow(rit))->layout()->bottomsep;
1176
1177                                 if (tmptop > 0)
1178                                         layoutasc = (tmptop * defaultRowHeight());
1179                         } else if (pit->params().lineTop()) {
1180                                 tmptop = layout->topsep;
1181
1182                                 if (tmptop > 0)
1183                                         layoutasc = (tmptop * defaultRowHeight());
1184                         }
1185
1186                         prev = outerHook(pit, ownerParagraphs());
1187                         if (prev != ownerParagraphs().end())  {
1188                                 maxasc += int(prev->layout()->parsep * defaultRowHeight());
1189                         } else if (pit != ownerParagraphs().begin()) {
1190                                 ParagraphList::iterator prior_pit = boost::prior(pit);
1191                                 if (prior_pit->getDepth() != 0 ||
1192                                     prior_pit->layout() == layout) {
1193                                         maxasc += int(layout->parsep * defaultRowHeight());
1194                                 }
1195                         }
1196                 }
1197         }
1198
1199         // is it a bottom line?
1200         if (boost::next(rit) == pit->rows.end()) {
1201                 // the bottom margin
1202                 ParagraphList::iterator nextpit = boost::next(pit);
1203                 if (nextpit == ownerParagraphs().end() && !isInInset())
1204                         maxdesc += PAPER_MARGIN;
1205
1206                 // add the vertical spaces, that the user added
1207                 maxdesc += getLengthMarkerHeight(*bv(), pit->params().spaceBottom());
1208
1209                 // do not forget the DTP-lines!
1210                 // there height depends on the font of the nearest character
1211                 if (pit->params().lineBottom())
1212                         maxdesc += 2 * font_metrics::ascent('x',
1213                                         getFont(pit, max(pos_type(0), pit->size() - 1)));
1214
1215                 // and now the pagebreaks
1216                 if (pit->params().pagebreakBottom())
1217                         maxdesc += 3 * defaultRowHeight();
1218
1219                 // and now the layout spaces, for example before and after
1220                 // a section, or between the items of a itemize or enumerate
1221                 // environment
1222                 if (!pit->params().pagebreakBottom()
1223                     && nextpit != ownerParagraphs().end()) {
1224                         ParagraphList::iterator comparepit = pit;
1225                         float usual = 0;
1226                         float unusual = 0;
1227
1228                         if (comparepit->getDepth() > nextpit->getDepth()) {
1229                                 usual = (comparepit->layout()->bottomsep * defaultRowHeight());
1230                                 comparepit = depthHook(comparepit, ownerParagraphs(), nextpit->getDepth());
1231                                 if (comparepit->layout()!= nextpit->layout()
1232                                         || nextpit->getLabelWidthString() !=
1233                                         comparepit->getLabelWidthString())
1234                                 {
1235                                         unusual = (comparepit->layout()->bottomsep * defaultRowHeight());
1236                                 }
1237                                 if (unusual > usual)
1238                                         layoutdesc = unusual;
1239                                 else
1240                                         layoutdesc = usual;
1241                         } else if (comparepit->getDepth() ==  nextpit->getDepth()) {
1242
1243                                 if (comparepit->layout() != nextpit->layout()
1244                                         || nextpit->getLabelWidthString() !=
1245                                         comparepit->getLabelWidthString())
1246                                         layoutdesc = int(comparepit->layout()->bottomsep * defaultRowHeight());
1247                         }
1248                 }
1249         }
1250
1251         // incalculate the layout spaces
1252         maxasc += int(layoutasc * 2 / (2 + pit->getDepth()));
1253         maxdesc += int(layoutdesc * 2 / (2 + pit->getDepth()));
1254
1255         // calculate the new height of the text
1256         height -= rit->height();
1257
1258         rit->height(maxasc + maxdesc + labeladdon);
1259         rit->baseline(maxasc + labeladdon);
1260
1261         height += rit->height();
1262
1263         rit->top_of_text(rit->baseline() - font_metrics::maxAscent(font));
1264
1265         double x = 0;
1266         if (layout->margintype != MARGIN_RIGHT_ADDRESS_BOX) {
1267                 // this IS needed
1268                 rit->width(maxwidth);
1269                 double dummy;
1270                 prepareToPrint(pit, rit, x, dummy, dummy, dummy, false);
1271         }
1272         rit->width(int(maxwidth + x));
1273         if (inset_owner) {
1274                 width = max(0, workWidth());
1275                 RowList::iterator rit = firstRow();
1276                 RowList::iterator end = endRow();
1277                 ParagraphList::iterator it = ownerParagraphs().begin();
1278                 while (rit != end) {
1279                         if (rit->width() > width)
1280                                 width = rit->width();
1281                         nextRow(it, rit);
1282                 }
1283         }
1284 }
1285
1286
1287 void LyXText::breakParagraph(ParagraphList & paragraphs, char keep_layout)
1288 {
1289         // allow only if at start or end, or all previous is new text
1290         if (cursor.pos() && cursor.pos() != cursor.par()->size()
1291                 && cursor.par()->isChangeEdited(0, cursor.pos()))
1292                 return;
1293
1294         LyXTextClass const & tclass =
1295                 bv()->buffer()->params.getLyXTextClass();
1296         LyXLayout_ptr const & layout = cursor.par()->layout();
1297
1298         // this is only allowed, if the current paragraph is not empty or caption
1299         // and if it has not the keepempty flag active
1300         if (cursor.par()->empty() && !cursor.par()->allowEmpty()
1301            && layout->labeltype != LABEL_SENSITIVE)
1302                 return;
1303
1304         recordUndo(bv(), Undo::ATOMIC, cursor.par());
1305
1306         // Always break behind a space
1307         //
1308         // It is better to erase the space (Dekel)
1309         if (cursor.pos() < cursor.par()->size()
1310              && cursor.par()->isLineSeparator(cursor.pos()))
1311            cursor.par()->erase(cursor.pos());
1312
1313         // break the paragraph
1314         if (keep_layout)
1315                 keep_layout = 2;
1316         else
1317                 keep_layout = layout->isEnvironment();
1318
1319         // we need to set this before we insert the paragraph. IMO the
1320         // breakParagraph call should return a bool if it inserts the
1321         // paragraph before or behind and we should react on that one
1322         // but we can fix this in 1.3.0 (Jug 20020509)
1323         bool const isempty = (cursor.par()->allowEmpty() && cursor.par()->empty());
1324         ::breakParagraph(bv()->buffer()->params, paragraphs, cursor.par(),
1325                          cursor.pos(), keep_layout);
1326
1327 #warning Trouble Point! (Lgb)
1328         // When ::breakParagraph is called from within an inset we must
1329         // ensure that the correct ParagraphList is used. Today that is not
1330         // the case and the Buffer::paragraphs is used. Not good. (Lgb)
1331         ParagraphList::iterator next_par = boost::next(cursor.par());
1332
1333         // well this is the caption hack since one caption is really enough
1334         if (layout->labeltype == LABEL_SENSITIVE) {
1335                 if (!cursor.pos())
1336                         // set to standard-layout
1337                         cursor.par()->applyLayout(tclass.defaultLayout());
1338                 else
1339                         // set to standard-layout
1340                         next_par->applyLayout(tclass.defaultLayout());
1341         }
1342
1343         // if the cursor is at the beginning of a row without prior newline,
1344         // move one row up!
1345         // This touches only the screen-update. Otherwise we would may have
1346         // an empty row on the screen
1347         if (cursor.pos() && cursorRow()->pos() == cursor.pos()
1348             && !cursor.par()->isNewline(cursor.pos() - 1))
1349         {
1350                 cursorLeft(bv());
1351         }
1352
1353         while (!next_par->empty() && next_par->isNewline(0))
1354                 next_par->erase(0);
1355
1356         updateCounters();
1357         redoParagraph(cursor.par());
1358         redoParagraph(next_par);
1359
1360         // This check is necessary. Otherwise the new empty paragraph will
1361         // be deleted automatically. And it is more friendly for the user!
1362         if (cursor.pos() || isempty)
1363                 setCursor(next_par, 0);
1364         else
1365                 setCursor(cursor.par(), 0);
1366 }
1367
1368
1369 // convenience function
1370 void LyXText::redoParagraph()
1371 {
1372         clearSelection();
1373         redoParagraph(cursor.par());
1374         setCursorIntern(cursor.par(), cursor.pos());
1375 }
1376
1377
1378 // insert a character, moves all the following breaks in the
1379 // same Paragraph one to the right and make a rebreak
1380 void LyXText::insertChar(char c)
1381 {
1382         recordUndo(bv(), Undo::INSERT, cursor.par());
1383
1384         // When the free-spacing option is set for the current layout,
1385         // disable the double-space checking
1386
1387         bool const freeSpacing = cursor.par()->layout()->free_spacing ||
1388                 cursor.par()->isFreeSpacing();
1389
1390         if (lyxrc.auto_number) {
1391                 static string const number_operators = "+-/*";
1392                 static string const number_unary_operators = "+-";
1393                 static string const number_seperators = ".,:";
1394
1395                 if (current_font.number() == LyXFont::ON) {
1396                         if (!IsDigit(c) && !contains(number_operators, c) &&
1397                             !(contains(number_seperators, c) &&
1398                               cursor.pos() >= 1 &&
1399                               cursor.pos() < cursor.par()->size() &&
1400                               getFont(cursor.par(), cursor.pos()).number() == LyXFont::ON &&
1401                               getFont(cursor.par(), cursor.pos() - 1).number() == LyXFont::ON)
1402                            )
1403                                 number(bv()); // Set current_font.number to OFF
1404                 } else if (IsDigit(c) &&
1405                            real_current_font.isVisibleRightToLeft()) {
1406                         number(bv()); // Set current_font.number to ON
1407
1408                         if (cursor.pos() > 0) {
1409                                 char const c = cursor.par()->getChar(cursor.pos() - 1);
1410                                 if (contains(number_unary_operators, c) &&
1411                                     (cursor.pos() == 1 ||
1412                                      cursor.par()->isSeparator(cursor.pos() - 2) ||
1413                                      cursor.par()->isNewline(cursor.pos() - 2))
1414                                   ) {
1415                                         setCharFont(
1416                                                     cursor.par(),
1417                                                     cursor.pos() - 1,
1418                                                     current_font);
1419                                 } else if (contains(number_seperators, c) &&
1420                                            cursor.pos() >= 2 &&
1421                                            getFont(
1422                                                    cursor.par(),
1423                                                    cursor.pos() - 2).number() == LyXFont::ON) {
1424                                         setCharFont(
1425                                                     cursor.par(),
1426                                                     cursor.pos() - 1,
1427                                                     current_font);
1428                                 }
1429                         }
1430                 }
1431         }
1432
1433
1434         // First check, if there will be two blanks together or a blank at
1435         // the beginning of a paragraph.
1436         // I decided to handle blanks like normal characters, the main
1437         // difference are the special checks when calculating the row.fill
1438         // (blank does not count at the end of a row) and the check here
1439
1440         // The bug is triggered when we type in a description environment:
1441         // The current_font is not changed when we go from label to main text
1442         // and it should (along with realtmpfont) when we type the space.
1443         // CHECK There is a bug here! (Asger)
1444
1445         // store the current font.  This is because of the use of cursor
1446         // movements. The moving cursor would refresh the current font
1447         LyXFont realtmpfont = real_current_font;
1448         LyXFont rawtmpfont = current_font;
1449
1450         if (!freeSpacing && IsLineSeparatorChar(c)) {
1451                 if ((cursor.pos() > 0
1452                      && cursor.par()->isLineSeparator(cursor.pos() - 1))
1453                     || (cursor.pos() > 0
1454                         && cursor.par()->isNewline(cursor.pos() - 1))
1455                     || (cursor.pos() == 0)) {
1456                         static bool sent_space_message = false;
1457                         if (!sent_space_message) {
1458                                 if (cursor.pos() == 0)
1459                                         bv()->owner()->message(_("You cannot insert a space at the beginning of a paragraph. Please read the Tutorial."));
1460                                 else
1461                                         bv()->owner()->message(_("You cannot type two spaces this way. Please read the Tutorial."));
1462                                 sent_space_message = true;
1463                         }
1464                         charInserted();
1465                         return;
1466                 }
1467         }
1468
1469         // Here case LyXText::InsertInset already inserted the character
1470         if (c != Paragraph::META_INSET)
1471                 cursor.par()->insertChar(cursor.pos(), c);
1472
1473         setCharFont(cursor.par(), cursor.pos(), rawtmpfont);
1474
1475         current_font = rawtmpfont;
1476         real_current_font = realtmpfont;
1477         redoParagraph(cursor.par());
1478         setCursor(cursor.par(), cursor.pos() + 1, false, cursor.boundary());
1479
1480         charInserted();
1481 }
1482
1483
1484 void LyXText::charInserted()
1485 {
1486         // Here we could call FinishUndo for every 20 characters inserted.
1487         // This is from my experience how emacs does it. (Lgb)
1488         static unsigned int counter;
1489         if (counter < 20) {
1490                 ++counter;
1491         } else {
1492                 finishUndo();
1493                 counter = 0;
1494         }
1495 }
1496
1497
1498 void LyXText::prepareToPrint(ParagraphList::iterator pit,
1499            RowList::iterator rit, double & x,
1500                              double & fill_separator,
1501                              double & fill_hfill,
1502                              double & fill_label_hfill,
1503                              bool bidi) const
1504 {
1505         double w = rit->fill();
1506         fill_hfill = 0;
1507         fill_label_hfill = 0;
1508         fill_separator = 0;
1509         fill_label_hfill = 0;
1510
1511         bool const is_rtl =
1512                 pit->isRightToLeftPar(bv()->buffer()->params);
1513         if (is_rtl)
1514                 x = workWidth() > 0 ? rightMargin(pit, *bv()->buffer(), *rit) : 0;
1515         else
1516                 x = workWidth() > 0 ? leftMargin(pit, *rit) : 0;
1517
1518         // is there a manual margin with a manual label
1519         LyXLayout_ptr const & layout = pit->layout();
1520
1521         if (layout->margintype == MARGIN_MANUAL
1522             && layout->labeltype == LABEL_MANUAL) {
1523                 /// We might have real hfills in the label part
1524                 int nlh = numberOfLabelHfills(*pit, rit);
1525
1526                 // A manual label par (e.g. List) has an auto-hfill
1527                 // between the label text and the body of the
1528                 // paragraph too.
1529                 // But we don't want to do this auto hfill if the par
1530                 // is empty.
1531                 if (!pit->empty())
1532                         ++nlh;
1533
1534                 if (nlh && !pit->getLabelWidthString().empty()) {
1535                         fill_label_hfill = labelFill(pit, *rit) / double(nlh);
1536                 }
1537         }
1538
1539         // are there any hfills in the row?
1540         int const nh = numberOfHfills(*pit, rit);
1541
1542         if (nh) {
1543                 if (w > 0)
1544                         fill_hfill = w / nh;
1545         // we don't have to look at the alignment if it is ALIGN_LEFT and
1546         // if the row is already larger then the permitted width as then
1547         // we force the LEFT_ALIGN'edness!
1548         } else if (int(rit->width()) < workWidth()) {
1549                 // is it block, flushleft or flushright?
1550                 // set x how you need it
1551                 int align;
1552                 if (pit->params().align() == LYX_ALIGN_LAYOUT) {
1553                         align = layout->align;
1554                 } else {
1555                         align = pit->params().align();
1556                 }
1557
1558                 // center displayed insets
1559                 InsetOld * inset = 0;
1560                 if (rit->pos() < pit->size()
1561                     && pit->isInset(rit->pos())
1562                     && (inset = pit->getInset(rit->pos()))
1563                     && (inset->display())) // || (inset->scroll() < 0)))
1564                     align = (inset->lyxCode() == InsetOld::MATHMACRO_CODE)
1565                         ? LYX_ALIGN_BLOCK : LYX_ALIGN_CENTER;
1566                 // ERT insets should always be LEFT ALIGNED on screen
1567                 inset = pit->inInset();
1568                 if (inset && inset->owner() &&
1569                         inset->owner()->lyxCode() == InsetOld::ERT_CODE)
1570                 {
1571                         align = LYX_ALIGN_LEFT;
1572                 }
1573
1574                 switch (align) {
1575             case LYX_ALIGN_BLOCK:
1576             {
1577                         int const ns = numberOfSeparators(*pit, rit);
1578                         RowList::iterator next_row = boost::next(rit);
1579                         if (ns
1580                                 && next_row != pit->rows.end()
1581                                 && !pit->isNewline(next_row->pos() - 1)
1582                           && !(pit->isInset(next_row->pos())
1583                                      && pit->getInset(next_row->pos())
1584                                      && pit->getInset(next_row->pos())->display())
1585                                 ) {
1586                                 fill_separator = w / ns;
1587                         } else if (is_rtl) {
1588                                 x += w;
1589                         }
1590                         break;
1591             }
1592             case LYX_ALIGN_RIGHT:
1593                         x += w;
1594                         break;
1595             case LYX_ALIGN_CENTER:
1596                         x += w / 2;
1597                         break;
1598                 }
1599         }
1600         if (!bidi)
1601                 return;
1602
1603         computeBidiTables(pit, bv()->buffer(), rit);
1604         if (is_rtl) {
1605                 pos_type body_pos = pit->beginningOfBody();
1606                 pos_type last = lastPos(*pit, rit);
1607
1608                 if (body_pos > 0 &&
1609                     (body_pos - 1 > last ||
1610                      !pit->isLineSeparator(body_pos - 1))) {
1611                         x += font_metrics::width(layout->labelsep, getLabelFont(pit));
1612                         if (body_pos - 1 <= last)
1613                                 x += fill_label_hfill;
1614                 }
1615         }
1616 }
1617
1618
1619 // important for the screen
1620
1621
1622 // the cursor set functions have a special mechanism. When they
1623 // realize, that you left an empty paragraph, they will delete it.
1624 // They also delete the corresponding row
1625
1626 void LyXText::cursorRightOneWord()
1627 {
1628         ::cursorRightOneWord(cursor, ownerParagraphs());
1629         setCursor(cursor.par(), cursor.pos());
1630 }
1631
1632
1633 // Skip initial whitespace at end of word and move cursor to *start*
1634 // of prior word, not to end of next prior word.
1635 void LyXText::cursorLeftOneWord()
1636 {
1637         LyXCursor tmpcursor = cursor;
1638         ::cursorLeftOneWord(tmpcursor, ownerParagraphs());
1639         setCursor(tmpcursor.par(), tmpcursor.pos());
1640 }
1641
1642
1643 void LyXText::selectWord(word_location loc)
1644 {
1645         LyXCursor from = cursor;
1646         LyXCursor to;
1647         ::getWord(from, to, loc, ownerParagraphs());
1648         if (cursor != from)
1649                 setCursor(from.par(), from.pos());
1650         if (to == from)
1651                 return;
1652         selection.cursor = cursor;
1653         setCursor(to.par(), to.pos());
1654         setSelection();
1655 }
1656
1657
1658 // Select the word currently under the cursor when no
1659 // selection is currently set
1660 bool LyXText::selectWordWhenUnderCursor(word_location loc)
1661 {
1662         if (!selection.set()) {
1663                 selectWord(loc);
1664                 return selection.set();
1665         }
1666         return false;
1667 }
1668
1669
1670 void LyXText::acceptChange()
1671 {
1672         if (!selection.set() && cursor.par()->size())
1673                 return;
1674
1675         if (selection.start.par() == selection.end.par()) {
1676                 LyXCursor & startc = selection.start;
1677                 LyXCursor & endc = selection.end;
1678                 recordUndo(bv(), Undo::INSERT, startc.par());
1679                 startc.par()->acceptChange(startc.pos(), endc.pos());
1680                 finishUndo();
1681                 clearSelection();
1682                 redoParagraph(startc.par());
1683                 setCursorIntern(startc.par(), 0);
1684         }
1685 #warning handle multi par selection
1686 }
1687
1688
1689 void LyXText::rejectChange()
1690 {
1691         if (!selection.set() && cursor.par()->size())
1692                 return;
1693
1694         if (selection.start.par() == selection.end.par()) {
1695                 LyXCursor & startc = selection.start;
1696                 LyXCursor & endc = selection.end;
1697                 recordUndo(bv(), Undo::INSERT, startc.par());
1698                 startc.par()->rejectChange(startc.pos(), endc.pos());
1699                 finishUndo();
1700                 clearSelection();
1701                 redoParagraph(startc.par());
1702                 setCursorIntern(startc.par(), 0);
1703         }
1704 #warning handle multi par selection
1705 }
1706
1707
1708 // This function is only used by the spellchecker for NextWord().
1709 // It doesn't handle LYX_ACCENTs and probably never will.
1710 WordLangTuple const
1711 LyXText::selectNextWordToSpellcheck(float & value)
1712 {
1713         if (the_locking_inset) {
1714                 WordLangTuple word = the_locking_inset->selectNextWordToSpellcheck(bv(), value);
1715                 if (!word.word().empty()) {
1716                         value += float(cursor.y());
1717                         value /= float(height);
1718                         return word;
1719                 }
1720                 // we have to go on checking so move cursor to the next char
1721                 if (cursor.pos() == cursor.par()->size()) {
1722                         if (boost::next(cursor.par()) == ownerParagraphs().end())
1723                                 return word;
1724                         cursor.par(boost::next(cursor.par()));
1725                         cursor.pos(0);
1726                 } else
1727                         cursor.pos(cursor.pos() + 1);
1728         }
1729         ParagraphList::iterator tmppit = cursor.par();
1730
1731         // If this is not the very first word, skip rest of
1732         // current word because we are probably in the middle
1733         // of a word if there is text here.
1734         if (cursor.pos() || cursor.par() != ownerParagraphs().begin()) {
1735                 while (cursor.pos() < cursor.par()->size()
1736                        && cursor.par()->isLetter(cursor.pos()))
1737                         cursor.pos(cursor.pos() + 1);
1738         }
1739
1740         // Now, skip until we have real text (will jump paragraphs)
1741         while (true) {
1742                 ParagraphList::iterator cpit = cursor.par();
1743                 pos_type const cpos(cursor.pos());
1744
1745                 if (cpos == cpit->size()) {
1746                         if (boost::next(cpit) != ownerParagraphs().end()) {
1747                                 cursor.par(boost::next(cpit));
1748                                 cursor.pos(0);
1749                                 continue;
1750                         }
1751                         break;
1752                 }
1753
1754                 bool const is_good_inset = cpit->isInset(cpos)
1755                         && cpit->getInset(cpos)->allowSpellcheck();
1756
1757                 if (!isDeletedText(*cpit, cpos)
1758                     && (is_good_inset || cpit->isLetter(cpos)))
1759                         break;
1760
1761                 cursor.pos(cpos + 1);
1762         }
1763
1764         // now check if we hit an inset so it has to be a inset containing text!
1765         if (cursor.pos() < cursor.par()->size() &&
1766             cursor.par()->isInset(cursor.pos())) {
1767                 // lock the inset!
1768                 FuncRequest cmd(bv(), LFUN_INSET_EDIT, "left");
1769                 cursor.par()->getInset(cursor.pos())->localDispatch(cmd);
1770                 // now call us again to do the above trick
1771                 // but obviously we have to start from down below ;)
1772                 return bv()->text->selectNextWordToSpellcheck(value);
1773         }
1774
1775         // Update the value if we changed paragraphs
1776         if (cursor.par() != tmppit) {
1777                 setCursor(cursor.par(), cursor.pos());
1778                 value = float(cursor.y())/float(height);
1779         }
1780
1781         // Start the selection from here
1782         selection.cursor = cursor;
1783
1784         string lang_code = getFont(cursor.par(), cursor.pos()).language()->code();
1785         // and find the end of the word (insets like optional hyphens
1786         // and ligature break are part of a word)
1787         while (cursor.pos() < cursor.par()->size()
1788                && cursor.par()->isLetter(cursor.pos())
1789                && !isDeletedText(*cursor.par(), cursor.pos()))
1790                 cursor.pos(cursor.pos() + 1);
1791
1792         // Finally, we copy the word to a string and return it
1793         string str;
1794         if (selection.cursor.pos() < cursor.pos()) {
1795                 pos_type i;
1796                 for (i = selection.cursor.pos(); i < cursor.pos(); ++i) {
1797                         if (!cursor.par()->isInset(i))
1798                                 str += cursor.par()->getChar(i);
1799                 }
1800         }
1801         return WordLangTuple(str, lang_code);
1802 }
1803
1804
1805 // This one is also only for the spellchecker
1806 void LyXText::selectSelectedWord()
1807 {
1808         if (the_locking_inset) {
1809                 the_locking_inset->selectSelectedWord(bv());
1810                 return;
1811         }
1812         // move cursor to the beginning
1813         setCursor(selection.cursor.par(), selection.cursor.pos());
1814
1815         // set the sel cursor
1816         selection.cursor = cursor;
1817
1818         // now find the end of the word
1819         while (cursor.pos() < cursor.par()->size()
1820                && cursor.par()->isLetter(cursor.pos()))
1821                 cursor.pos(cursor.pos() + 1);
1822
1823         setCursor(cursor.par(), cursor.pos());
1824
1825         // finally set the selection
1826         setSelection();
1827 }
1828
1829
1830 // Delete from cursor up to the end of the current or next word.
1831 void LyXText::deleteWordForward()
1832 {
1833         if (cursor.par()->empty())
1834                 cursorRight(bv());
1835         else {
1836                 LyXCursor tmpcursor = cursor;
1837                 selection.set(true); // to avoid deletion
1838                 cursorRightOneWord();
1839                 setCursor(tmpcursor, tmpcursor.par(), tmpcursor.pos());
1840                 selection.cursor = cursor;
1841                 cursor = tmpcursor;
1842                 setSelection();
1843
1844                 // Great, CutSelection() gets rid of multiple spaces.
1845                 cutSelection(true, false);
1846         }
1847 }
1848
1849
1850 // Delete from cursor to start of current or prior word.
1851 void LyXText::deleteWordBackward()
1852 {
1853         if (cursor.par()->empty())
1854                 cursorLeft(bv());
1855         else {
1856                 LyXCursor tmpcursor = cursor;
1857                 selection.set(true); // to avoid deletion
1858                 cursorLeftOneWord();
1859                 setCursor(tmpcursor, tmpcursor.par(), tmpcursor.pos());
1860                 selection.cursor = cursor;
1861                 cursor = tmpcursor;
1862                 setSelection();
1863                 cutSelection(true, false);
1864         }
1865 }
1866
1867
1868 // Kill to end of line.
1869 void LyXText::deleteLineForward()
1870 {
1871         if (cursor.par()->empty())
1872                 // Paragraph is empty, so we just go to the right
1873                 cursorRight(bv());
1874         else {
1875                 LyXCursor tmpcursor = cursor;
1876                 // We can't store the row over a regular setCursor
1877                 // so we set it to 0 and reset it afterwards.
1878                 selection.set(true); // to avoid deletion
1879                 cursorEnd();
1880                 setCursor(tmpcursor, tmpcursor.par(), tmpcursor.pos());
1881                 selection.cursor = cursor;
1882                 cursor = tmpcursor;
1883                 setSelection();
1884                 // What is this test for ??? (JMarc)
1885                 if (!selection.set()) {
1886                         deleteWordForward();
1887                 } else {
1888                         cutSelection(true, false);
1889                 }
1890         }
1891 }
1892
1893
1894 void LyXText::changeCase(LyXText::TextCase action)
1895 {
1896         LyXCursor from;
1897         LyXCursor to;
1898
1899         if (selection.set()) {
1900                 from = selection.start;
1901                 to = selection.end;
1902         } else {
1903                 from = cursor;
1904                 ::getWord(from, to, lyx::PARTIAL_WORD, ownerParagraphs());
1905                 setCursor(to.par(), to.pos() + 1);
1906         }
1907
1908         recordUndo(bv(), Undo::ATOMIC, from.par(), to.par());
1909
1910         pos_type pos = from.pos();
1911         ParagraphList::iterator pit = from.par();
1912
1913         while (pit != ownerParagraphs().end() &&
1914                (pos != to.pos() || pit != to.par())) {
1915                 if (pos == pit->size()) {
1916                         ++pit;
1917                         pos = 0;
1918                         continue;
1919                 }
1920                 unsigned char c = pit->getChar(pos);
1921                 if (!IsInsetChar(c)) {
1922                         switch (action) {
1923                         case text_lowercase:
1924                                 c = lowercase(c);
1925                                 break;
1926                         case text_capitalization:
1927                                 c = uppercase(c);
1928                                 action = text_lowercase;
1929                                 break;
1930                         case text_uppercase:
1931                                 c = uppercase(c);
1932                                 break;
1933                         }
1934                 }
1935 #warning changes
1936                 pit->setChar(pos, c);
1937                 ++pos;
1938         }
1939 }
1940
1941
1942 void LyXText::Delete()
1943 {
1944         // this is a very easy implementation
1945
1946         LyXCursor old_cursor = cursor;
1947         int const old_cur_par_id = old_cursor.par()->id();
1948         int const old_cur_par_prev_id =
1949                 (old_cursor.par() != ownerParagraphs().begin() ?
1950                  boost::prior(old_cursor.par())->id() : -1);
1951
1952         // just move to the right
1953         cursorRight(bv());
1954
1955         // CHECK Look at the comment here.
1956         // This check is not very good...
1957         // The cursorRightIntern calls DeleteEmptyParagrapgMechanism
1958         // and that can very well delete the par or par->previous in
1959         // old_cursor. Will a solution where we compare paragraph id's
1960         //work better?
1961         if ((cursor.par() != ownerParagraphs().begin() ? boost::prior(cursor.par())->id() : -1)
1962             == old_cur_par_prev_id
1963             && cursor.par()->id() != old_cur_par_id) {
1964                 // delete-empty-paragraph-mechanism has done it
1965                 return;
1966         }
1967
1968         // if you had success make a backspace
1969         if (old_cursor.par() != cursor.par() || old_cursor.pos() != cursor.pos()) {
1970                 LyXCursor tmpcursor = cursor;
1971                 // to make sure undo gets the right cursor position
1972                 cursor = old_cursor;
1973                 recordUndo(bv(), Undo::DELETE, cursor.par());
1974                 cursor = tmpcursor;
1975                 backspace();
1976         }
1977 }
1978
1979
1980 void LyXText::backspace()
1981 {
1982         // Get the font that is used to calculate the baselineskip
1983         pos_type lastpos = cursor.par()->size();
1984
1985         if (cursor.pos() == 0) {
1986                 // The cursor is at the beginning of a paragraph,
1987                 // so the the backspace will collapse two paragraphs into one.
1988
1989                 // but it's not allowed unless it's new
1990                 if (cursor.par()->isChangeEdited(0, cursor.par()->size()))
1991                         return;
1992
1993                 // we may paste some paragraphs
1994
1995                 // is it an empty paragraph?
1996
1997                 if (lastpos == 0
1998                      || (lastpos == 1 && cursor.par()->isSeparator(0))) {
1999                         // This is an empty paragraph and we delete it just
2000                         // by moving the cursor one step
2001                         // left and let the DeleteEmptyParagraphMechanism
2002                         // handle the actual deletion of the paragraph.
2003
2004                         if (cursor.par() != ownerParagraphs().begin()) {
2005                                 ParagraphList::iterator tmppit = boost::prior(cursor.par());
2006                                 if (cursor.par()->layout() == tmppit->layout()
2007                                     && cursor.par()->getAlign() == tmppit->getAlign()) {
2008                                         // Inherit bottom DTD from the paragraph below.
2009                                         // (the one we are deleting)
2010                                         tmppit->params().lineBottom(cursor.par()->params().lineBottom());
2011                                         tmppit->params().spaceBottom(cursor.par()->params().spaceBottom());
2012                                         tmppit->params().pagebreakBottom(cursor.par()->params().pagebreakBottom());
2013                                 }
2014
2015                                 cursorLeft(bv());
2016
2017                                 // the layout things can change the height of a row !
2018                                 setHeightOfRow(cursor.par(), cursorRow());
2019                                 return;
2020                         }
2021                 }
2022
2023                 if (cursor.par() != ownerParagraphs().begin()) {
2024                         recordUndo(bv(), Undo::DELETE,
2025                                 boost::prior(cursor.par()),
2026                                 cursor.par());
2027                 }
2028
2029                 ParagraphList::iterator tmppit = cursor.par();
2030                 // We used to do cursorLeftIntern() here, but it is
2031                 // not a good idea since it triggers the auto-delete
2032                 // mechanism. So we do a cursorLeftIntern()-lite,
2033                 // without the dreaded mechanism. (JMarc)
2034                 if (cursor.par() != ownerParagraphs().begin()) {
2035                         // steps into the above paragraph.
2036                         setCursorIntern(boost::prior(cursor.par()),
2037                                         boost::prior(cursor.par())->size(),
2038                                         false);
2039                 }
2040
2041                 // Pasting is not allowed, if the paragraphs have different
2042                 // layout. I think it is a real bug of all other
2043                 // word processors to allow it. It confuses the user.
2044                 //Correction: Pasting is always allowed with standard-layout
2045                 LyXTextClass const & tclass =
2046                         bv()->buffer()->params.getLyXTextClass();
2047
2048                 if (cursor.par() != tmppit
2049                     && (cursor.par()->layout() == tmppit->layout()
2050                         || tmppit->layout() == tclass.defaultLayout())
2051                     && cursor.par()->getAlign() == tmppit->getAlign()) {
2052                         mergeParagraph(bv()->buffer()->params,
2053                                 bv()->buffer()->paragraphs, cursor.par());
2054
2055                         if (cursor.pos() && cursor.par()->isSeparator(cursor.pos() - 1))
2056                                 cursor.pos(cursor.pos() - 1);
2057
2058                         // the row may have changed, block, hfills etc.
2059                         updateCounters();
2060                         setCursor(cursor.par(), cursor.pos(), false);
2061                 }
2062         } else {
2063                 // this is the code for a normal backspace, not pasting
2064                 // any paragraphs
2065                 recordUndo(bv(), Undo::DELETE, cursor.par());
2066                 // We used to do cursorLeftIntern() here, but it is
2067                 // not a good idea since it triggers the auto-delete
2068                 // mechanism. So we do a cursorLeftIntern()-lite,
2069                 // without the dreaded mechanism. (JMarc)
2070                 setCursorIntern(cursor.par(), cursor.pos() - 1,
2071                                 false, cursor.boundary());
2072                 cursor.par()->erase(cursor.pos());
2073         }
2074
2075         lastpos = cursor.par()->size();
2076         if (cursor.pos() == lastpos)
2077                 setCurrentFont();
2078
2079         redoParagraph();
2080         setCursor(cursor.par(), cursor.pos(), false, !cursor.boundary());
2081 }
2082
2083
2084 RowList::iterator LyXText::cursorRow() const
2085 {
2086         return getRow(cursor.par(), cursor.pos());
2087 }
2088
2089
2090 RowList::iterator LyXText::getRow(LyXCursor const & cur) const
2091 {
2092         return getRow(cur.par(), cur.pos());
2093 }
2094
2095
2096 RowList::iterator
2097 LyXText::getRow(ParagraphList::iterator pit, pos_type pos) const
2098 {
2099         RowList::iterator rit = pit->rows.begin();
2100         RowList::iterator end = pit->rows.end();
2101
2102 #warning Why is this next thing needed? (Andre)
2103         while (rit != end
2104                      && rit->pos() < pos
2105                      && boost::next(rit) != end
2106                      && boost::next(rit)->pos() <= pos)
2107                 ++rit;
2108
2109         return rit;
2110 }
2111
2112
2113 // returns pointer to a specified row
2114 RowList::iterator
2115 LyXText::getRow(ParagraphList::iterator pit, pos_type pos, int & y) const
2116 {
2117         y = 0;
2118
2119         if (noRows())
2120                 return firstRow();
2121
2122         ParagraphList::iterator it = ownerParagraphs().begin();
2123         for ( ; it != pit; ++it) {
2124                 RowList::iterator beg = it->rows.begin();
2125                 RowList::iterator end = it->rows.end();
2126                 for (RowList::iterator rit = beg; rit != end; ++rit)
2127                         y += rit->height();
2128         }
2129
2130         RowList::iterator rit = pit->rows.begin();
2131         RowList::iterator end = pit->rows.end();
2132         while (rit != end
2133                && rit->pos() < pos
2134                && boost::next(rit) != end
2135                && boost::next(rit)->pos() <= pos) {
2136                 y += rit->height();
2137                 ++rit;
2138         }
2139
2140         return rit;
2141 }
2142
2143
2144 // returns pointer to some fancy row 'below' specified row
2145 RowList::iterator LyXText::cursorIRow() const
2146 {
2147         int y = 0;
2148         return getRow(cursor.par(), cursor.pos(), y);
2149 }
2150
2151
2152 RowList::iterator LyXText::getRowNearY(int & y,
2153         ParagraphList::iterator & pit) const
2154 {
2155         ParagraphList::iterator const end = ownerParagraphs().end();
2156         //lyxerr << "getRowNearY: y " << y << endl;
2157
2158         for (pit = ownerParagraphs().begin(); pit != end; ++pit) {
2159                 RowList::iterator rit = pit->rows.begin();
2160                 RowList::iterator rend = pit->rows.end();
2161
2162                 for ( ; rit != rend; ++rit) {
2163                         //rit->dump();
2164                         if (rit->y() >= y) {
2165                                 if (rit != firstRow())
2166                                         previousRow(pit, rit);
2167                                 y = rit->y();
2168                                 return rit;
2169                         }
2170                 }
2171         }
2172
2173 #if 1
2174         pit = ownerParagraphs().begin();
2175         y = 0;
2176         lyxerr << "row not found near " << y << "  pit: " << &*pit << endl;
2177         return firstRow();
2178 #else
2179         pit = boost::prior(ownerParagraphs().end());
2180         lyxerr << "row not found near " << y << "  pit: " << &*pit << endl;
2181         return lastRow();
2182 #endif
2183 }
2184
2185
2186 int LyXText::getDepth() const
2187 {
2188         return cursor.par()->getDepth();
2189 }
2190
2191
2192 RowList::iterator LyXText::firstRow() const
2193 {
2194         return ownerParagraphs().front().rows.begin();
2195 }
2196
2197
2198 RowList::iterator LyXText::lastRow() const
2199 {
2200         return boost::prior(endRow());
2201 }
2202
2203
2204 RowList::iterator LyXText::endRow() const
2205 {
2206         return ownerParagraphs().back().rows.end();
2207 }
2208
2209
2210 void LyXText::nextRow(ParagraphList::iterator & pit,
2211         RowList::iterator & rit) const
2212 {
2213         if (boost::next(rit) != pit->rows.end()) {
2214                 rit = boost::next(rit);
2215         } else {
2216                 ++pit;
2217                 if (pit == ownerParagraphs().end())
2218                         rit = boost::next(rit);
2219                 else
2220                         rit = pit->rows.begin();
2221         }
2222 }
2223
2224
2225 void LyXText::previousRow(ParagraphList::iterator & pit,
2226         RowList::iterator & rit) const
2227 {
2228         if (rit != pit->rows.begin())
2229                 rit = boost::prior(rit);
2230         else {
2231                 Assert(pit != ownerParagraphs().begin());
2232                 --pit;
2233                 rit = boost::prior(pit->rows.end());
2234         }
2235 }
2236
2237
2238 bool LyXText::noRows() const
2239 {
2240         return ownerParagraphs().begin()->rows.empty();
2241 }