src/rowpainter.cpp

   1 /**
   2  * \file rowpainter.cpp
   3  * This file is part of LyX, the document processor.
   4  * Licence details can be found in the file COPYING.
   5  *
   6  * \author various
   7  * \author John Levon
   8  *
   9  * Full author contact details are available in file CREDITS.
  10  */
  11
  12 #include <config.h>
  13
  14 #include "rowpainter.h"
  15
  16 #include "Bidi.h"
  17 #include "Buffer.h"
  18 #include "CoordCache.h"
  19 #include "Cursor.h"
  20 #include "debug.h"
  21 #include "BufferParams.h"
  22 #include "BufferView.h"
  23 #include "Encoding.h"
  24 #include "gettext.h"
  25 #include "Language.h"
  26 #include "Color.h"
  27 #include "LyXRC.h"
  28 #include "Row.h"
  29 #include "MetricsInfo.h"
  30 #include "Paragraph.h"
  31 #include "ParagraphMetrics.h"
  32 #include "paragraph_funcs.h"
  33 #include "ParagraphParameters.h"
  34 #include "TextMetrics.h"
  35 #include "VSpace.h"
  36
  37 #include "frontends/FontMetrics.h"
  38 #include "frontends/Painter.h"
  39
  40 #include "insets/InsetText.h"
  41
  42 #include "support/textutils.h"
  43
  44 #include <boost/crc.hpp>
  45
  46 using std::endl;
  47 using std::max;
  48 using std::string;
  49
  50
  51 namespace lyx {
  52
  53 using frontend::Painter;
  54 using frontend::FontMetrics;
  55
  56 RowPainter::RowPainter(PainterInfo & pi,
  57         Text const & text, pit_type pit, Row const & row, Bidi & bidi, int x, int y)
  58         : bv_(*pi.base.bv), pain_(pi.pain), text_(text),
  59           text_metrics_(pi.base.bv->textMetrics(&text)),
  60           pars_(text.paragraphs()),
  61           row_(row), pit_(pit), par_(text.paragraphs()[pit]),
  62           pm_(text_metrics_.parMetrics(pit)),
  63           bidi_(bidi), erased_(pi.erased_),
  64           xo_(x), yo_(y), width_(text_metrics_.width())
  65 {
  66         bidi_.computeTables(par_, bv_.buffer(), row_);
  67         x_ = row_.x + xo_;
  68
  69         //lyxerr << "RowPainter: x: " << x_ << " xo: " << xo_ << " yo: " << yo_ << endl;
  70         //row_.dump();
  71
  72         BOOST_ASSERT(pit >= 0);
  73         BOOST_ASSERT(pit < int(text.paragraphs().size()));
  74 }
  75
  76
  77 Font const RowPainter::getLabelFont() const
  78 {
  79         return text_.getLabelFont(bv_.buffer(), par_);
  80 }
  81
  82
  83 int RowPainter::leftMargin() const
  84 {
  85         return text_.leftMargin(bv_.buffer(), text_metrics_.width(), pit_,
  86                 row_.pos());
  87 }
  88
  89
  90 // If you want to debug inset metrics uncomment the following line:
  91 // #define DEBUG_METRICS
  92 // This draws green lines around each inset.
  93
  94
  95 void RowPainter::paintInset(pos_type const pos, Font const & font)
  96 {
  97         Inset const * inset = par_.getInset(pos);
  98         BOOST_ASSERT(inset);
  99         PainterInfo pi(const_cast<BufferView *>(&bv_), pain_);
 100         // FIXME: We should always use font, see documentation of
 101         // noFontChange() in Inset.h.
 102         pi.base.font = inset->noFontChange() ?
 103                 bv_.buffer().params().getFont() :
 104                 font;
 105         pi.ltr_pos = (bidi_.level(pos) % 2 == 0);
 106         pi.erased_ = erased_ || par_.isDeleted(pos);
 107 #ifdef DEBUG_METRICS
 108         int const x1 = int(x_);
 109 #endif
 110         bv_.coordCache().insets().add(inset, int(x_), yo_);
 111         // insets are painted completely. Recursive
 112         inset->drawSelection(pi, int(x_), yo_);
 113         inset->draw(pi, int(x_), yo_);
 114         x_ += inset->width();
 115 #ifdef DEBUG_METRICS
 116         Dimension dim;
 117         BOOST_ASSERT(max_witdh_ > 0);
 118         int right_margin = text_metrics_.rightMargin(pm_);
 119         int const w = max_witdh_ - leftMargin() - right_margin;
 120         MetricsInfo mi(&bv_, font, w);
 121         inset->metrics(mi, dim);
 122         if (inset->width() > dim.wid)
 123                 lyxerr << "Error: inset " << to_ascii(inset->getInsetName())
 124                        << " draw width " << inset->width()
 125                        << "> metrics width " << dim.wid << "." << std::endl;
 126         if (inset->ascent() > dim.asc)
 127                 lyxerr << "Error: inset " << to_ascii(inset->getInsetName())
 128                        << " draw ascent " << inset->ascent()
 129                        << "> metrics ascent " << dim.asc << "." << std::endl;
 130         if (inset->descent() > dim.des)
 131                 lyxerr << "Error: inset " << to_ascii(inset->getInsetName())
 132                        << " draw ascent " << inset->descent()
 133                        << "> metrics descent " << dim.des << "." << std::endl;
 134         BOOST_ASSERT(inset->width() <= dim.wid);
 135         BOOST_ASSERT(inset->ascent() <= dim.asc);
 136         BOOST_ASSERT(inset->descent() <= dim.des);
 137         int const x2 = x1 + dim.wid;
 138         int const y1 = yo_ + dim.des;
 139         int const y2 = yo_ - dim.asc;
 140         pi.pain.line(x1, y1, x1, y2, Color::green);
 141         pi.pain.line(x1, y1, x2, y1, Color::green);
 142         pi.pain.line(x2, y1, x2, y2, Color::green);
 143         pi.pain.line(x1, y2, x2, y2, Color::green);
 144 #endif
 145 }
 146
 147
 148 void RowPainter::paintHebrewComposeChar(pos_type & vpos, Font const & font)
 149 {
 150         pos_type pos = bidi_.vis2log(vpos);
 151
 152         docstring str;
 153
 154         // first char
 155         char_type c = par_.getChar(pos);
 156         str += c;
 157         ++vpos;
 158
 159         int const width = theFontMetrics(font).width(c);
 160         int dx = 0;
 161
 162         for (pos_type i = pos - 1; i >= 0; --i) {
 163                 c = par_.getChar(i);
 164                 if (!Encodings::isComposeChar_hebrew(c)) {
 165                         if (isPrintableNonspace(c)) {
 166                                 int const width2 = pm_.singleWidth(i,
 167                                         text_.getFont(bv_.buffer(), par_, i));
 168                                 dx = (c == 0x05e8 || // resh
 169                                       c == 0x05d3)   // dalet
 170                                         ? width2 - width
 171                                         : (width2 - width) / 2;
 172                         }
 173                         break;
 174                 }
 175         }
 176
 177         // Draw nikud
 178         pain_.text(int(x_) + dx, yo_, str, font);
 179 }
 180
 181
 182 void RowPainter::paintArabicComposeChar(pos_type & vpos, Font const & font)
 183 {
 184         pos_type pos = bidi_.vis2log(vpos);
 185         docstring str;
 186
 187         // first char
 188         char_type c = par_.getChar(pos);
 189         c = par_.transformChar(c, pos);
 190         str += c;
 191         ++vpos;
 192
 193         int const width = theFontMetrics(font).width(c);
 194         int dx = 0;
 195
 196         for (pos_type i = pos - 1; i >= 0; --i) {
 197                 c = par_.getChar(i);
 198                 if (!Encodings::isComposeChar_arabic(c)) {
 199                         if (isPrintableNonspace(c)) {
 200                                 int const width2 = pm_.singleWidth(i,
 201                                                 text_.getFont(bv_.buffer(), par_, i));
 202                                 dx = (width2 - width) / 2;
 203                         }
 204                         break;
 205                 }
 206         }
 207         // Draw nikud
 208         pain_.text(int(x_) + dx, yo_, str, font);
 209 }
 210
 211
 212 void RowPainter::paintChars(pos_type & vpos, Font const & font,
 213                             bool hebrew, bool arabic)
 214 {
 215         // This method takes up 70% of time when typing
 216         pos_type pos = bidi_.vis2log(vpos);
 217         pos_type const end = row_.endpos();
 218         FontSpan const font_span = par_.fontSpan(pos);
 219         Change::Type const prev_change = par_.lookupChange(pos).type;
 220
 221         // first character
 222         std::vector<char_type> str;
 223         str.reserve(100);
 224         str.push_back(par_.getChar(pos));
 225
 226         if (arabic) {
 227                 char_type c = str[0];
 228                 if (c == '(')
 229                         c = ')';
 230                 else if (c == ')')
 231                         c = '(';
 232                 str[0] = par_.transformChar(c, pos);
 233         }
 234
 235         // collect as much similar chars as we can
 236         for (++vpos ; vpos < end ; ++vpos) {
 237                 pos = bidi_.vis2log(vpos);
 238                 if (pos < font_span.first || pos > font_span.last)
 239                         break;
 240
 241                 if (prev_change != par_.lookupChange(pos).type)
 242                         break;
 243
 244                 char_type c = par_.getChar(pos);
 245
 246                 if (!isPrintableNonspace(c))
 247                         break;
 248
 249                 /* Because we do our own bidi, at this point the strings are
 250                  * already in visual order. However, Qt also applies its own
 251                  * bidi algorithm to strings that it paints to the screen.
 252                  * Therefore, if we were to paint Hebrew/Arabic words as a
 253                  * single string, the letters in the words would get reversed
 254                  * again. In order to avoid that, we don't collect Hebrew/
 255                  * Arabic characters, but rather paint them one at a time.
 256                  * See also http://thread.gmane.org/gmane.editors.lyx.devel/79740
 257                  */
 258                 if (hebrew)
 259                         break;
 260
 261                 /* FIXME: these checks are irrelevant, since 'arabic' and
 262                  * 'hebrew' alone are already going to trigger a break.
 263                  * However, this should not be removed completely, because
 264                  * if an alternative solution is found which allows grouping
 265                  * of arabic and hebrew characters, then these breaks may have
 266                  * to be re-applied.
 267
 268                 if (arabic && Encodings::isComposeChar_arabic(c))
 269                         break;
 270
 271                 if (hebrew && Encodings::isComposeChar_hebrew(c))
 272                         break;
 273                 */
 274
 275                 if (arabic) {
 276                         if (c == '(')
 277                                 c = ')';
 278                         else if (c == ')')
 279                                 c = '(';
 280                         c = par_.transformChar(c, pos);
 281                         /* see comment in hebrew, explaining why we break */
 282                         break;
 283                 }
 284
 285                 str.push_back(c);
 286         }
 287
 288         docstring s(&str[0], str.size());
 289
 290         if (prev_change != Change::UNCHANGED) {
 291                 Font copy(font);
 292                 if (prev_change == Change::DELETED) {
 293                         copy.setColor(Color::deletedtext);
 294                 } else if (prev_change == Change::INSERTED) {
 295                         copy.setColor(Color::addedtext);
 296                 }
 297                 x_ += pain_.text(int(x_), yo_, s, copy);
 298         } else {
 299                 x_ += pain_.text(int(x_), yo_, s, font);
 300         }
 301 }
 302
 303
 304 void RowPainter::paintForeignMark(double orig_x, Font const & font, int desc)
 305 {
 306         if (!lyxrc.mark_foreign_language)
 307                 return;
 308         if (font.language() == latex_language)
 309                 return;
 310         if (font.language() == bv_.buffer().params().language)
 311                 return;
 312
 313         int const y = yo_ + 1 + desc;
 314         pain_.line(int(orig_x), y, int(x_), y, Color::language);
 315 }
 316
 317
 318 void RowPainter::paintFromPos(pos_type & vpos)
 319 {
 320         pos_type const pos = bidi_.vis2log(vpos);
 321         Font orig_font = text_.getFont(bv_.buffer(), par_, pos);
 322
 323         double const orig_x = x_;
 324
 325         if (par_.isInset(pos)) {
 326                 // If outer row has changed, nested insets are repaint completely.
 327                 paintInset(pos, orig_font);
 328                 ++vpos;
 329                 paintForeignMark(orig_x, orig_font,
 330                         par_.getInset(pos)->descent());
 331                 return;
 332         }
 333
 334         // usual characters, no insets
 335         char_type const c = par_.getChar(pos);
 336
 337         // special case languages
 338         std::string const & lang = orig_font.language()->lang();
 339         bool const hebrew = lang == "hebrew";
 340         bool const arabic = lang == "arabic_arabtex" || lang == "arabic_arabi" ||
 341                                                 lang == "farsi";
 342
 343         // draw as many chars as we can
 344         if ((!hebrew && !arabic)
 345                 || (hebrew && !Encodings::isComposeChar_hebrew(c))
 346                 || (arabic && !Encodings::isComposeChar_arabic(c))) {
 347                 paintChars(vpos, orig_font, hebrew, arabic);
 348         } else if (hebrew) {
 349                 paintHebrewComposeChar(vpos, orig_font);
 350         } else if (arabic) {
 351                 paintArabicComposeChar(vpos, orig_font);
 352         }
 353
 354         paintForeignMark(orig_x, orig_font);
 355 }
 356
 357
 358 void RowPainter::paintChangeBar()
 359 {
 360         pos_type const start = row_.pos();
 361         pos_type end = row_.endpos();
 362
 363         if (par_.size() == end) {
 364                 // this is the last row of the paragraph;
 365                 // thus, we must also consider the imaginary end-of-par character
 366                 end++;
 367         }
 368
 369         if (start == end || !par_.isChanged(start, end))
 370                 return;
 371
 372         int const height = text_.isLastRow(pit_, row_)
 373                 ? row_.ascent()
 374                 : row_.height();
 375
 376         pain_.fillRectangle(5, yo_ - row_.ascent(), 3, height, Color::changebar);
 377 }
 378
 379
 380 void RowPainter::paintAppendix()
 381 {
 382         // only draw the appendix frame once (for the main text)
 383         if (!par_.params().appendix() || !text_.isMainText(bv_.buffer()))
 384                 return;
 385
 386         int y = yo_ - row_.ascent();
 387
 388         if (par_.params().startOfAppendix())
 389                 y += 2 * defaultRowHeight();
 390
 391         pain_.line(1, y, 1, yo_ + row_.height(), Color::appendix);
 392         pain_.line(width_ - 2, y, width_ - 2, yo_ + row_.height(), Color::appendix);
 393 }
 394
 395
 396 void RowPainter::paintDepthBar()
 397 {
 398         depth_type const depth = par_.getDepth();
 399
 400         if (depth <= 0)
 401                 return;
 402
 403         depth_type prev_depth = 0;
 404         if (!text_.isFirstRow(pit_, row_)) {
 405                 pit_type pit2 = pit_;
 406                 if (row_.pos() == 0)
 407                         --pit2;
 408                 prev_depth = pars_[pit2].getDepth();
 409         }
 410
 411         depth_type next_depth = 0;
 412         if (!text_.isLastRow(pit_, row_)) {
 413                 pit_type pit2 = pit_;
 414                 if (row_.endpos() >= pars_[pit2].size())
 415                         ++pit2;
 416                 next_depth = pars_[pit2].getDepth();
 417         }
 418
 419         for (depth_type i = 1; i <= depth; ++i) {
 420                 int const w = nestMargin() / 5;
 421                 int x = int(xo_) + w * i;
 422                 // only consider the changebar space if we're drawing outermost text
 423                 if (text_.isMainText(bv_.buffer()))
 424                         x += changebarMargin();
 425
 426                 int const starty = yo_ - row_.ascent();
 427                 int const h =  row_.height() - 1 - (i - next_depth - 1) * 3;
 428
 429                 pain_.line(x, starty, x, starty + h, Color::depthbar);
 430
 431                 if (i > prev_depth)
 432                         pain_.fillRectangle(x, starty, w, 2, Color::depthbar);
 433                 if (i > next_depth)
 434                         pain_.fillRectangle(x, starty + h, w, 2, Color::depthbar);
 435         }
 436 }
 437
 438
 439 int RowPainter::paintAppendixStart(int y)
 440 {
 441         Font pb_font;
 442         pb_font.setColor(Color::appendix);
 443         pb_font.decSize();
 444
 445         int w = 0;
 446         int a = 0;
 447         int d = 0;
 448
 449         docstring const label = _("Appendix");
 450         theFontMetrics(pb_font).rectText(label, w, a, d);
 451
 452         int const text_start = int(xo_ + (width_ - w) / 2);
 453         int const text_end = text_start + w;
 454
 455         pain_.rectText(text_start, y + d, label, pb_font, Color::none, Color::none);
 456
 457         pain_.line(int(xo_ + 1), y, text_start, y, Color::appendix);
 458         pain_.line(text_end, y, int(xo_ + width_ - 2), y, Color::appendix);
 459
 460         return 3 * defaultRowHeight();
 461 }
 462
 463
 464 void RowPainter::paintFirst()
 465 {
 466         ParagraphParameters const & parparams = par_.params();
 467
 468         int y_top = 0;
 469
 470         // start of appendix?
 471         if (parparams.startOfAppendix())
 472                 y_top += paintAppendixStart(yo_ - row_.ascent() + 2 * defaultRowHeight());
 473
 474         Buffer const & buffer = bv_.buffer();
 475
 476         LayoutPtr const & layout = par_.layout();
 477
 478         if (buffer.params().paragraph_separation == BufferParams::PARSEP_SKIP) {
 479                 if (pit_ != 0) {
 480                         if (layout->latextype == LATEX_PARAGRAPH
 481                                 && !par_.getDepth()) {
 482                                 y_top += buffer.params().getDefSkip().inPixels(bv_);
 483                         } else {
 484                                 LayoutPtr const & playout = pars_[pit_ - 1].layout();
 485                                 if (playout->latextype == LATEX_PARAGRAPH
 486                                         && !pars_[pit_ - 1].getDepth()) {
 487                                         // is it right to use defskip here, too? (AS)
 488                                         y_top += buffer.params().getDefSkip().inPixels(bv_);
 489                                 }
 490                         }
 491                 }
 492         }
 493
 494         bool const is_rtl = text_.isRTL(buffer, par_);
 495         bool const is_seq = isFirstInSequence(pit_, text_.paragraphs());
 496         //lyxerr << "paintFirst: " << par_.id() << " is_seq: " << is_seq << std::endl;
 497
 498         // should we print a label?
 499         if (layout->labeltype >= LABEL_STATIC
 500             && (layout->labeltype != LABEL_STATIC
 501                       || layout->latextype != LATEX_ENVIRONMENT
 502                       || is_seq)) {
 503
 504                 Font const font = getLabelFont();
 505                 FontMetrics const & fm = theFontMetrics(font);
 506
 507                 docstring const str = par_.getLabelstring();
 508                 if (!str.empty()) {
 509                         double x = x_;
 510
 511                         // this is special code for the chapter layout. This is
 512                         // printed in an extra row and has a pagebreak at
 513                         // the top.
 514                         if (layout->counter == "chapter") {
 515                                 double spacing_val = 1.0;
 516                                 if (!parparams.spacing().isDefault()) {
 517                                         spacing_val = parparams.spacing().getValue();
 518                                 } else {
 519                                         spacing_val = buffer.params().spacing().getValue();
 520                                 }
 521
 522                                 int const labeladdon = int(fm.maxHeight() * layout->spacing.getValue() * spacing_val);
 523
 524                                 int const maxdesc = int(fm.maxDescent() * layout->spacing.getValue() * spacing_val)
 525                                         + int(layout->parsep) * defaultRowHeight();
 526
 527                                 if (is_rtl) {
 528                                         x = width_ - leftMargin() -
 529                                                 fm.width(str);
 530                                 }
 531
 532                                 pain_.text(int(x), yo_ - maxdesc - labeladdon, str, font);
 533                         } else {
 534                                 if (is_rtl) {
 535                                         x = width_ - leftMargin()
 536                                                 + fm.width(layout->labelsep);
 537                                 } else {
 538                                         x = x_ - fm.width(layout->labelsep)
 539                                                 - fm.width(str);
 540                                 }
 541
 542                                 pain_.text(int(x), yo_, str, font);
 543                         }
 544                 }
 545
 546         // the labels at the top of an environment.
 547         // More or less for bibliography
 548         } else if (is_seq &&
 549                 (layout->labeltype == LABEL_TOP_ENVIRONMENT ||
 550                 layout->labeltype == LABEL_BIBLIO ||
 551                 layout->labeltype == LABEL_CENTERED_TOP_ENVIRONMENT)) {
 552                 Font font = getLabelFont();
 553                 if (!par_.getLabelstring().empty()) {
 554                         docstring const str = par_.getLabelstring();
 555                         double spacing_val = 1.0;
 556                         if (!parparams.spacing().isDefault())
 557                                 spacing_val = parparams.spacing().getValue();
 558                         else
 559                                 spacing_val = buffer.params().spacing().getValue();
 560
 561                         FontMetrics const & fm = theFontMetrics(font);
 562
 563                         int const labeladdon = int(fm.maxHeight()
 564                                 * layout->spacing.getValue() * spacing_val);
 565
 566                         int maxdesc =
 567                                 int(fm.maxDescent() * layout->spacing.getValue() * spacing_val
 568                                 + (layout->labelbottomsep * defaultRowHeight()));
 569
 570                         double x = x_;
 571                         if (layout->labeltype == LABEL_CENTERED_TOP_ENVIRONMENT) {
 572                                 if (is_rtl)
 573                                         x = leftMargin();
 574                                 x += (width_ - text_metrics_.rightMargin(pm_) - leftMargin()) / 2;
 575                                 x -= fm.width(str) / 2;
 576                         } else if (is_rtl) {
 577                                 x = width_ - leftMargin() -     fm.width(str);
 578                         }
 579                         pain_.text(int(x), yo_ - maxdesc - labeladdon, str, font);
 580                 }
 581         }
 582 }
 583
 584
 585 void RowPainter::paintLast()
 586 {
 587         bool const is_rtl = text_.isRTL(bv_.buffer(), par_);
 588         int const endlabel = getEndLabel(pit_, text_.paragraphs());
 589
 590         // paint imaginary end-of-paragraph character
 591
 592         if (par_.isInserted(par_.size()) || par_.isDeleted(par_.size())) {
 593                 FontMetrics const & fm = theFontMetrics(bv_.buffer().params().getFont());
 594                 int const length = fm.maxAscent() / 2;
 595                 Color::color col = par_.isInserted(par_.size()) ? Color::addedtext : Color::deletedtext;
 596
 597                 pain_.line(int(x_) + 1, yo_ + 2, int(x_) + 1, yo_ + 2 - length, col,
 598                            Painter::line_solid, Painter::line_thick);
 599                 pain_.line(int(x_) + 1 - length, yo_ + 2, int(x_) + 1, yo_ + 2, col,
 600                            Painter::line_solid, Painter::line_thick);
 601         }
 602
 603         // draw an endlabel
 604
 605         switch (endlabel) {
 606         case END_LABEL_BOX:
 607         case END_LABEL_FILLED_BOX: {
 608                 Font const font = getLabelFont();
 609                 FontMetrics const & fm = theFontMetrics(font);
 610                 int const size = int(0.75 * fm.maxAscent());
 611                 int const y = yo_ - size;
 612                 int x = is_rtl ? nestMargin() + changebarMargin() : width_ - size;
 613
 614                 if (width_ - int(row_.width()) <= size)
 615                         x += (size - width_ + row_.width() + 1) * (is_rtl ? -1 : 1);
 616
 617                 if (endlabel == END_LABEL_BOX)
 618                         pain_.rectangle(x, y, size, size, Color::eolmarker);
 619                 else
 620                         pain_.fillRectangle(x, y, size, size, Color::eolmarker);
 621                 break;
 622         }
 623
 624         case END_LABEL_STATIC: {
 625                 Font font = getLabelFont();
 626                 FontMetrics const & fm = theFontMetrics(font);
 627                 docstring const & str = par_.layout()->endlabelstring();
 628                 double const x = is_rtl ?
 629                         x_ - fm.width(str)
 630                         : - text_metrics_.rightMargin(pm_) - row_.width();
 631                 pain_.text(int(x), yo_, str, font);
 632                 break;
 633         }
 634
 635         case END_LABEL_NO_LABEL:
 636                 break;
 637         }
 638 }
 639
 640
 641 void RowPainter::paintText()
 642 {
 643         pos_type const end = row_.endpos();
 644         // Spaces at logical line breaks in bidi text must be skipped during
 645         // painting. However, they may appear visually in the middle
 646         // of a row; they must be skipped, wherever they are...
 647         // * logically "abc_[HEBREW_\nHEBREW]"
 648         // * visually "abc_[_WERBEH\nWERBEH]"
 649         pos_type skipped_sep_vpos = -1;
 650         pos_type body_pos = par_.beginOfBody();
 651         if (body_pos > 0 &&
 652                 (body_pos > end || !par_.isLineSeparator(body_pos - 1))) {
 653                 body_pos = 0;
 654         }
 655
 656         LayoutPtr const & layout = par_.layout();
 657
 658         bool running_strikeout = false;
 659         bool is_struckout = false;
 660         int last_strikeout_x = 0;
 661
 662         // Use font span to speed things up, see below
 663         FontSpan font_span;
 664         Font font;
 665         Buffer const & buffer = bv_.buffer();
 666
 667         // If the last logical character is a separator, don't paint it, unless
 668         // it's in the last row of a paragraph; see skipped_sep_vpos declaration
 669         if (end > 0 && end < par_.size() && par_.isSeparator(end - 1))
 670                 skipped_sep_vpos = bidi_.log2vis(end - 1);
 671
 672         for (pos_type vpos = row_.pos(); vpos < end; ) {
 673                 if (x_ > bv_.workWidth())
 674                         break;
 675
 676                 // Skip the separator at the logical end of the row
 677                 if (vpos == skipped_sep_vpos) {
 678                         ++vpos;
 679                         continue;
 680                 }
 681
 682                 pos_type const pos = bidi_.vis2log(vpos);
 683
 684                 if (pos >= par_.size()) {
 685                         ++vpos;
 686                         continue;
 687                 }
 688
 689                 // Use font span to speed things up, see above
 690                 if (vpos < font_span.first || vpos > font_span.last) {
 691                         font_span = par_.fontSpan(vpos);
 692                         font = text_.getFont(buffer, par_, vpos);
 693                 }
 694
 695                 const int width_pos = pm_.singleWidth(pos, font);
 696
 697                 if (x_ + width_pos < 0) {
 698                         x_ += width_pos;
 699                         ++vpos;
 700                         continue;
 701                 }
 702
 703                 is_struckout = par_.isDeleted(pos);
 704
 705                 if (is_struckout && !running_strikeout) {
 706                         running_strikeout = true;
 707                         last_strikeout_x = int(x_);
 708                 }
 709
 710                 bool const highly_editable_inset = par_.isInset(pos)
 711                         && isHighlyEditableInset(par_.getInset(pos));
 712
 713                 // If we reach the end of a struck out range, paint it.
 714                 // We also don't paint across things like tables
 715                 if (running_strikeout && (highly_editable_inset || !is_struckout)) {
 716                         // Calculate 1/3 height of the buffer's default font
 717                         FontMetrics const & fm
 718                                 = theFontMetrics(bv_.buffer().params().getFont());
 719                         int const middle = yo_ - fm.maxAscent() / 3;
 720                         pain_.line(last_strikeout_x, middle, int(x_), middle,
 721                                 Color::deletedtext, Painter::line_solid, Painter::line_thin);
 722                         running_strikeout = false;
 723                 }
 724
 725                 if (body_pos > 0 && pos == body_pos - 1) {
 726                         int const lwidth = theFontMetrics(getLabelFont())
 727                                 .width(layout->labelsep);
 728
 729                         x_ += row_.label_hfill + lwidth - width_pos;
 730                 }
 731
 732                 if (par_.isHfill(pos)) {
 733                         x_ += 1;
 734
 735                         int const y0 = yo_;
 736                         int const y1 = y0 - defaultRowHeight() / 2;
 737
 738                         pain_.line(int(x_), y1, int(x_), y0, Color::added_space);
 739
 740                         if (par_.hfillExpansion(row_, pos)) {
 741                                 int const y2 = (y0 + y1) / 2;
 742
 743                                 if (pos >= body_pos) {
 744                                         pain_.line(int(x_), y2, int(x_ + row_.hfill), y2,
 745                                                   Color::added_space,
 746                                                   Painter::line_onoffdash);
 747                                         x_ += row_.hfill;
 748                                 } else {
 749                                         pain_.line(int(x_), y2, int(x_ + row_.label_hfill), y2,
 750                                                   Color::added_space,
 751                                                   Painter::line_onoffdash);
 752                                         x_ += row_.label_hfill;
 753                                 }
 754                                 pain_.line(int(x_), y1, int(x_), y0, Color::added_space);
 755                         }
 756                         x_ += 2;
 757                         ++vpos;
 758                 } else if (par_.isSeparator(pos)) {
 759                         Font orig_font = text_.getFont(bv_.buffer(), par_, pos);
 760                         double const orig_x = x_;
 761                         x_ += width_pos;
 762                         if (pos >= body_pos)
 763                                 x_ += row_.separator;
 764                         ++vpos;
 765                         paintForeignMark(orig_x, orig_font);
 766                 } else {
 767                         paintFromPos(vpos);
 768                 }
 769         }
 770
 771         // if we reach the end of a struck out range, paint it
 772         if (running_strikeout) {
 773                 // calculate 1/3 height of the buffer's default font
 774                 FontMetrics const & fm
 775                         = theFontMetrics(bv_.buffer().params().getFont());
 776                 int const middle = yo_ - fm.maxAscent() / 3;
 777                 pain_.line(last_strikeout_x, middle, int(x_), middle,
 778                         Color::deletedtext, Painter::line_solid, Painter::line_thin);
 779                 running_strikeout = false;
 780         }
 781 }
 782
 783 } // namespace lyx