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 #include <algorithm>
  14
  15 #include "RowPainter.h"
  16
  17 #include "Buffer.h"
  18 #include "CoordCache.h"
  19 #include "Cursor.h"
  20 #include "BufferParams.h"
  21 #include "BufferView.h"
  22 #include "Changes.h"
  23 #include "Language.h"
  24 #include "Layout.h"
  25 #include "LyXRC.h"
  26 #include "Row.h"
  27 #include "MetricsInfo.h"
  28 #include "Paragraph.h"
  29 #include "ParagraphMetrics.h"
  30 #include "ParagraphParameters.h"
  31 #include "TextMetrics.h"
  32 #include "VSpace.h"
  33
  34 #include "frontends/FontMetrics.h"
  35 #include "frontends/Painter.h"
  36
  37 #include "insets/InsetText.h"
  38
  39 #include "mathed/InsetMath.h"
  40
  41 #include "support/debug.h"
  42 #include "support/gettext.h"
  43 #include "support/textutils.h"
  44
  45 #include "support/lassert.h"
  46 #include <boost/crc.hpp>
  47
  48 #include <stdlib.h>
  49
  50 using namespace std;
  51
  52 namespace lyx {
  53
  54 using frontend::Painter;
  55 using frontend::FontMetrics;
  56
  57
  58 RowPainter::RowPainter(PainterInfo & pi,
  59         Text const & text, Row const & row, int x, int y)
  60         : pi_(pi), text_(text),
  61           text_metrics_(pi_.base.bv->textMetrics(&text)),
  62           pars_(text.paragraphs()),
  63           row_(row), par_(text.paragraphs()[row.pit()]),
  64           pm_(text_metrics_.parMetrics(row.pit())), change_(pi_.change_),
  65           xo_(x), yo_(y), width_(text_metrics_.width())
  66 {
  67         x_ = row_.left_margin + xo_;
  68
  69         //lyxerr << "RowPainter: x: " << x_ << " xo: " << xo_ << " yo: " << yo_ << endl;
  70         //row_.dump();
  71
  72         LBUFERR(row.pit() >= 0);
  73         LBUFERR(row.pit() < int(text.paragraphs().size()));
  74 }
  75
  76
  77 FontInfo RowPainter::labelFont() const
  78 {
  79         FontInfo f = text_.labelFont(par_);
  80         // selected text?
  81         if (row_.begin_margin_sel || pi_.selected)
  82                 f.setPaintColor(Color_selectiontext);
  83         return f;
  84 }
  85
  86
  87 // If you want to debug inset metrics uncomment the following line:
  88 //#define DEBUG_METRICS
  89 // This draws green lines around each inset.
  90
  91
  92 void RowPainter::paintInset(Row::Element const & e) const
  93 {
  94         // Handle selection
  95         bool const pi_selected = pi_.selected;
  96         Cursor const & cur = pi_.base.bv->cursor();
  97         if (cur.selection() && cur.text() == &text_
  98                 && cur.normalAnchor().text() == &text_)
  99                 pi_.selected = row_.sel_beg <= e.pos && row_.sel_end > e.pos;
 100
 101         LASSERT(e.inset, return);
 102         // Backup full_repaint status because some insets (InsetTabular)
 103         // requires a full repaint
 104         bool const pi_full_repaint = pi_.full_repaint;
 105         bool const pi_do_spellcheck = pi_.do_spellcheck;
 106         Change const pi_change = pi_.change_;
 107
 108         pi_.base.font = e.inset->inheritFont() ? e.font.fontInfo() :
 109                 pi_.base.bv->buffer().params().getFont().fontInfo();
 110         pi_.ltr_pos = !e.font.isVisibleRightToLeft();
 111         pi_.change_ = change_.changed() ? change_ : e.change;
 112         pi_.do_spellcheck &= e.inset->allowSpellCheck();
 113
 114         int const x1 = int(x_);
 115         pi_.base.bv->coordCache().insets().add(e.inset, x1, yo_);
 116         // insets are painted completely. Recursive
 117         // FIXME: it is wrong to completely paint the background
 118         // if we want to do single row painting.
 119         e.inset->drawBackground(pi_, x1, yo_);
 120         e.inset->drawSelection(pi_, x1, yo_);
 121         e.inset->draw(pi_, x1, yo_);
 122
 123         // Restore full_repaint status.
 124         pi_.full_repaint = pi_full_repaint;
 125         pi_.change_ = pi_change;
 126         pi_.do_spellcheck = pi_do_spellcheck;
 127         pi_.selected = pi_selected;
 128
 129 #ifdef DEBUG_METRICS
 130         Dimension const & dim = pi_.base.bv->coordCache().insets().dim(e.inset);
 131         int const x2 = x1 + dim.wid;
 132         int const y1 = yo_ + dim.des;
 133         int const y2 = yo_ - dim.asc;
 134         pi_.pain.line(x1, y1, x1, y2, Color_green);
 135         pi_.pain.line(x1, y1, x2, y1, Color_green);
 136         pi_.pain.line(x2, y1, x2, y2, Color_green);
 137         pi_.pain.line(x1, y2, x2, y2, Color_green);
 138 #endif
 139 }
 140
 141
 142 void RowPainter::paintForeignMark(Row::Element const & e) const
 143 {
 144         Language const * lang = e.font.language();
 145         if (!lyxrc.mark_foreign_language)
 146                 return;
 147         if (lang == latex_language)
 148                 return;
 149         if (lang == pi_.base.bv->buffer().params().language)
 150                 return;
 151
 152         int const desc = e.inset ? e.dim.descent() : 0;
 153         int const y = yo_ + pi_.base.solidLineOffset()
 154                 + desc + pi_.base.solidLineThickness() / 2;
 155         pi_.pain.line(int(x_), y, int(x_ + e.full_width()), y, Color_language,
 156                       Painter::line_solid, pi_.base.solidLineThickness());
 157 }
 158
 159
 160 void RowPainter::paintMisspelledMark(Row::Element const & e) const
 161 {
 162         // if changed the misspelled marker gets placed slightly lower than normal
 163         // to avoid drawing at the same vertical offset
 164         FontMetrics const & fm = theFontMetrics(e.font);
 165         int const thickness = max(fm.lineWidth(), 2);
 166         int const y = yo_ + pi_.base.solidLineOffset() + pi_.base.solidLineThickness()
 167                 + (e.change.changed() ? pi_.base.solidLineThickness() + 1 : 0)
 168                 + 1 + thickness / 2;
 169
 170         //FIXME: this could be computed only once, it is probably not costly.
 171         // check for cursor position
 172         // don't draw misspelled marker for words at cursor position
 173         // we don't want to disturb the process of text editing
 174         DocIterator const nw = pi_.base.bv->cursor().newWord();
 175         pos_type cpos = -1;
 176         if (!nw.empty() && par_.id() == nw.paragraph().id()) {
 177                 cpos = nw.pos();
 178                 if (cpos > 0 && cpos == par_.size() && !par_.isWordSeparator(cpos-1))
 179                         --cpos;
 180                 else if (cpos > 0 && par_.isWordSeparator(cpos))
 181                         --cpos;
 182         }
 183
 184         pos_type pos = e.pos;
 185         while (pos < e.pos + pos_type(e.str.length())) {
 186                 if (!par_.isMisspelled(pos)) {
 187                         ++pos;
 188                         continue;
 189                 }
 190
 191                 FontSpan const & range = par_.getSpellRange(pos);
 192
 193                 // Skip element which are being edited
 194                 if (range.contains(cpos)) {
 195                         // the range includes the last element
 196                         pos = range.last + 1;
 197                         continue;
 198                 }
 199
 200                 FontMetrics const & fm = theFontMetrics(e.font);
 201                 int x1 = fm.pos2x(e.str, range.first - e.pos,
 202                                   e.isRTL(), e.extra);
 203                 int x2 = fm.pos2x(e.str, min(range.last - e.pos + 1,
 204                                                                          pos_type(e.str.length())),
 205                                                                          e.isRTL(), e.extra);
 206                 if (x1 > x2)
 207                         swap(x1, x2);
 208
 209                 pi_.pain.line(int(x_ + x1), y, int(x_ + x2), y,
 210                               Color_error,
 211                               Painter::line_onoffdash, thickness);
 212                 pos = range.last + 1;
 213         }
 214 }
 215
 216
 217 void RowPainter::paintStringAndSel(Row::Element const & e) const
 218 {
 219         // at least part of text selected?
 220         bool const some_sel = (e.endpos >= row_.sel_beg && e.pos < row_.sel_end)
 221                 || pi_.selected;
 222         // all the text selected?
 223         bool const all_sel = (e.pos >= row_.sel_beg && e.endpos < row_.sel_end)
 224                 || pi_.selected;
 225
 226         if (all_sel || e.change.changed()) {
 227                 Font copy = e.font;
 228                 Color const col = e.change.changed() ? e.change.color()
 229                                                      : Color_selectiontext;
 230                 copy.fontInfo().setPaintColor(col);
 231                 pi_.pain.text(int(x_), yo_, e.str, copy, e.extra, e.full_width());
 232         } else if (!some_sel) {
 233                 pi_.pain.text(int(x_), yo_, e.str, e.font, e.extra, e.full_width());
 234         } else {
 235                 pi_.pain.text(int(x_), yo_, e.str, e.font, Color_selectiontext,
 236                               max(row_.sel_beg, e.pos) - e.pos,
 237                               min(row_.sel_end, e.endpos) - e.pos,
 238                               e.extra, e.full_width());
 239         }
 240 }
 241
 242
 243 void RowPainter::paintChange(Row::Element const & e) const
 244 {
 245         e.change.paintCue(pi_, x_, yo_, x_ + e.full_width(), e.font.fontInfo());
 246 }
 247
 248
 249 void RowPainter::paintChangeBar() const
 250 {
 251         pos_type const start = row_.pos();
 252         pos_type end = row_.endpos();
 253
 254         if (par_.size() == end) {
 255                 // this is the last row of the paragraph;
 256                 // thus, we must also consider the imaginary end-of-par character
 257                 end++;
 258         }
 259
 260         if (start == end || !par_.isChanged(start, end))
 261                 return;
 262
 263         int const height = text_metrics_.isLastRow(row_)
 264                 ? row_.ascent()
 265                 : row_.height();
 266
 267         pi_.pain.fillRectangle(5, yo_ - row_.ascent(), 3, height, Color_changebar);
 268 }
 269
 270
 271 void RowPainter::paintAppendix() const
 272 {
 273         // only draw the appendix frame once (for the main text)
 274         if (!par_.params().appendix() || !text_.isMainText())
 275                 return;
 276
 277         int y = yo_ - row_.ascent();
 278
 279         if (par_.params().startOfAppendix())
 280                 y += 2 * defaultRowHeight();
 281
 282         pi_.pain.line(1, y, 1, yo_ + row_.height(), Color_appendix);
 283         pi_.pain.line(width_ - 2, y, width_ - 2, yo_ + row_.height(), Color_appendix);
 284 }
 285
 286
 287 void RowPainter::paintDepthBar() const
 288 {
 289         depth_type const depth = par_.getDepth();
 290
 291         if (depth <= 0)
 292                 return;
 293
 294         depth_type prev_depth = 0;
 295         if (!text_metrics_.isFirstRow(row_)) {
 296                 pit_type pit2 = row_.pit();
 297                 if (row_.pos() == 0)
 298                         --pit2;
 299                 prev_depth = pars_[pit2].getDepth();
 300         }
 301
 302         depth_type next_depth = 0;
 303         if (!text_metrics_.isLastRow(row_)) {
 304                 pit_type pit2 = row_.pit();
 305                 if (row_.endpos() >= pars_[pit2].size())
 306                         ++pit2;
 307                 next_depth = pars_[pit2].getDepth();
 308         }
 309
 310         for (depth_type i = 1; i <= depth; ++i) {
 311                 int const w = nestMargin() / 5;
 312                 int x = int(xo_) + w * i;
 313                 // only consider the changebar space if we're drawing outermost text
 314                 if (text_.isMainText())
 315                         x += changebarMargin();
 316
 317                 int const starty = yo_ - row_.ascent();
 318                 int const h =  row_.height() - 1 - (i - next_depth - 1) * 3;
 319
 320                 pi_.pain.line(x, starty, x, starty + h, Color_depthbar);
 321
 322                 if (i > prev_depth)
 323                         pi_.pain.fillRectangle(x, starty, w, 2, Color_depthbar);
 324                 if (i > next_depth)
 325                         pi_.pain.fillRectangle(x, starty + h, w, 2, Color_depthbar);
 326         }
 327 }
 328
 329
 330 void RowPainter::paintAppendixStart(int y) const
 331 {
 332         FontInfo pb_font = sane_font;
 333         pb_font.setColor(Color_appendix);
 334         pb_font.decSize();
 335
 336         int w = 0;
 337         int a = 0;
 338         int d = 0;
 339
 340         docstring const label = _("Appendix");
 341         theFontMetrics(pb_font).rectText(label, w, a, d);
 342
 343         int const text_start = int(xo_ + (width_ - w) / 2);
 344         int const text_end = text_start + w;
 345
 346         pi_.pain.rectText(text_start, y + d, label, pb_font, Color_none, Color_none);
 347
 348         pi_.pain.line(int(xo_ + 1), y, text_start, y, Color_appendix);
 349         pi_.pain.line(text_end, y, int(xo_ + width_ - 2), y, Color_appendix);
 350 }
 351
 352
 353 void RowPainter::paintTooLargeMarks(bool const left, bool const right) const
 354 {
 355         if (left)
 356                 pi_.pain.line(pi_.base.dottedLineThickness(), yo_ - row_.ascent(),
 357                                           pi_.base.dottedLineThickness(), yo_ + row_.descent(),
 358                                           Color_scroll, Painter::line_onoffdash,
 359                               pi_.base.dottedLineThickness());
 360         if (right) {
 361                 int const wwidth =
 362                         pi_.base.bv->workWidth() - pi_.base.dottedLineThickness();
 363                 pi_.pain.line(wwidth, yo_ - row_.ascent(),
 364                                           wwidth, yo_ + row_.descent(),
 365                                           Color_scroll, Painter::line_onoffdash,
 366                               pi_.base.dottedLineThickness());
 367         }
 368 }
 369
 370
 371 void RowPainter::paintFirst() const
 372 {
 373         Layout const & layout = par_.layout();
 374
 375         // start of appendix?
 376         if (par_.params().startOfAppendix())
 377             paintAppendixStart(yo_ - row_.ascent() + 2 * defaultRowHeight());
 378
 379         bool const is_first =
 380                 text_.isFirstInSequence(row_.pit()) || !layout.isParagraphGroup();
 381         //lyxerr << "paintFirst: " << par_.id() << " is_seq: " << is_seq << endl;
 382
 383         if (layout.labelIsInline()
 384             && (layout.labeltype != LABEL_STATIC || is_first))
 385                 paintLabel();
 386         else if (is_first && layout.labelIsAbove())
 387                 paintTopLevelLabel();
 388 }
 389
 390
 391 void RowPainter::paintLabel() const
 392 {
 393         docstring const & str = par_.labelString();
 394         if (str.empty())
 395                 return;
 396
 397         bool const is_rtl = text_.isRTL(par_);
 398         Layout const & layout = par_.layout();
 399         FontInfo const font = labelFont();
 400         FontMetrics const & fm = theFontMetrics(font);
 401         double x = x_;
 402
 403         if (is_rtl)
 404                 x = width_ - row_.right_margin + fm.width(layout.labelsep);
 405         else
 406                 x = x_ - fm.width(layout.labelsep) - fm.width(str);
 407
 408         pi_.pain.text(int(x), yo_, str, font);
 409 }
 410
 411
 412 void RowPainter::paintTopLevelLabel() const
 413 {
 414         BufferParams const & bparams = pi_.base.bv->buffer().params();
 415         bool const is_rtl = text_.isRTL(par_);
 416         ParagraphParameters const & pparams = par_.params();
 417         Layout const & layout = par_.layout();
 418         FontInfo const font = labelFont();
 419         docstring const str = par_.labelString();
 420         if (str.empty())
 421                 return;
 422
 423         double spacing_val = 1.0;
 424         if (!pparams.spacing().isDefault())
 425                 spacing_val = pparams.spacing().getValue();
 426         else
 427                 spacing_val = bparams.spacing().getValue();
 428
 429         FontMetrics const & fm = theFontMetrics(font);
 430
 431         int const labeladdon = int(fm.maxHeight()
 432                 * layout.spacing.getValue() * spacing_val);
 433
 434         int maxdesc =
 435                 int(fm.maxDescent() * layout.spacing.getValue() * spacing_val
 436                 + (layout.labelbottomsep * defaultRowHeight()));
 437
 438         double x = x_;
 439         if (layout.labeltype == LABEL_CENTERED) {
 440                 x = row_.left_margin + (width_ - row_.left_margin - row_.right_margin) / 2;
 441                 x -= fm.width(str) / 2;
 442         } else if (is_rtl) {
 443                 x = width_ - row_.right_margin - fm.width(str);
 444         }
 445         pi_.pain.text(int(x), yo_ - maxdesc - labeladdon, str, font);
 446 }
 447
 448
 449 /** Check if the current paragraph is the last paragraph in a
 450     proof environment */
 451 static int getEndLabel(pit_type p, Text const & text)
 452 {
 453         ParagraphList const & pars = text.paragraphs();
 454         pit_type pit = p;
 455         depth_type par_depth = pars[p].getDepth();
 456         while (pit != pit_type(pars.size())) {
 457                 Layout const & layout = pars[pit].layout();
 458                 int const endlabeltype = layout.endlabeltype;
 459
 460                 if (endlabeltype != END_LABEL_NO_LABEL) {
 461                         if (p + 1 == pit_type(pars.size()))
 462                                 return endlabeltype;
 463
 464                         depth_type const next_depth =
 465                                 pars[p + 1].getDepth();
 466                         if (par_depth > next_depth ||
 467                             (par_depth == next_depth && layout != pars[p + 1].layout()))
 468                                 return endlabeltype;
 469                         break;
 470                 }
 471                 if (par_depth == 0)
 472                         break;
 473                 pit = text.outerHook(pit);
 474                 if (pit != pit_type(pars.size()))
 475                         par_depth = pars[pit].getDepth();
 476         }
 477         return END_LABEL_NO_LABEL;
 478 }
 479
 480
 481 void RowPainter::paintLast() const
 482 {
 483         bool const is_rtl = text_.isRTL(par_);
 484         int const endlabel = getEndLabel(row_.pit(), text_);
 485
 486         // paint imaginary end-of-paragraph character
 487
 488         Change const & change = par_.lookupChange(par_.size());
 489         if (change.changed()) {
 490                 FontMetrics const & fm =
 491                         theFontMetrics(pi_.base.bv->buffer().params().getFont());
 492                 int const length = fm.maxAscent() / 2;
 493                 Color col = change.color();
 494
 495                 pi_.pain.line(int(x_) + 1, yo_ + 2, int(x_) + 1, yo_ + 2 - length, col,
 496                            Painter::line_solid, 3);
 497
 498                 if (change.deleted()) {
 499                         pi_.pain.line(int(x_) + 1 - length, yo_ + 2, int(x_) + 1 + length,
 500                                 yo_ + 2, col, Painter::line_solid, 3);
 501                 } else {
 502                         pi_.pain.line(int(x_) + 1 - length, yo_ + 2, int(x_) + 1,
 503                                 yo_ + 2, col, Painter::line_solid, 3);
 504                 }
 505         }
 506
 507         // draw an endlabel
 508
 509         switch (endlabel) {
 510         case END_LABEL_BOX:
 511         case END_LABEL_FILLED_BOX: {
 512                 FontInfo const font = labelFont();
 513                 FontMetrics const & fm = theFontMetrics(font);
 514                 int const size = int(0.75 * fm.maxAscent());
 515                 int const y = yo_ - size;
 516
 517                 // If needed, move the box a bit to avoid overlapping with text.
 518                 int x = 0;
 519                 if (is_rtl) {
 520                         int const normal_x = nestMargin() + changebarMargin();
 521                         x = min(normal_x, row_.left_margin - size - Inset::TEXT_TO_INSET_OFFSET);
 522                 } else {
 523                         int const normal_x = width_ - row_.right_margin
 524                                 - size - Inset::TEXT_TO_INSET_OFFSET;
 525                         x = max(normal_x, row_.width());
 526                 }
 527
 528                 if (endlabel == END_LABEL_BOX)
 529                         pi_.pain.rectangle(x, y, size, size, Color_eolmarker);
 530                 else
 531                         pi_.pain.fillRectangle(x, y, size, size, Color_eolmarker);
 532                 break;
 533         }
 534
 535         case END_LABEL_STATIC: {
 536                 FontInfo const font = labelFont();
 537                 FontMetrics const & fm = theFontMetrics(font);
 538                 docstring const & str = par_.layout().endlabelstring();
 539                 double const x = is_rtl ? x_ - fm.width(str) : x_;
 540                 pi_.pain.text(int(x), yo_, str, font);
 541                 break;
 542         }
 543
 544         case END_LABEL_NO_LABEL:
 545                 break;
 546         }
 547 }
 548
 549
 550 void RowPainter::paintOnlyInsets()
 551 {
 552         Row::const_iterator cit = row_.begin();
 553         Row::const_iterator const & end = row_.end();
 554         for ( ; cit != end ; ++cit) {
 555                 Row::Element const & e = *cit;
 556                 if (e.type == Row::INSET) {
 557                         paintInset(e);
 558                         // The line that indicates word in a different language
 559                         paintForeignMark(e);
 560                         // change tracking (not for insets that handle it themselves)
 561                         if (!e.inset->canPaintChange(*pi_.base.bv))
 562                                 paintChange(e);
 563                 }
 564
 565                 x_ += e.full_width();
 566         }
 567 }
 568
 569
 570 void RowPainter::paintText()
 571 {
 572         Row::const_iterator cit = row_.begin();
 573         Row::const_iterator const & end = row_.end();
 574         for ( ; cit != end ; ++cit) {
 575                 Row::Element const & e = *cit;
 576
 577                 switch (e.type) {
 578                 case Row::STRING:
 579                 case Row::VIRTUAL:
 580                         paintStringAndSel(e);
 581
 582                         // Paint the spelling marks if enabled.
 583                         if (lyxrc.spellcheck_continuously && pi_.do_spellcheck && pi_.pain.isDrawingEnabled())
 584                                 paintMisspelledMark(e);
 585                         break;
 586
 587                 case Row::INSET:
 588                         paintInset(e);
 589                         break;
 590
 591                 case Row::SPACE:
 592                         pi_.pain.textDecoration(e.font.fontInfo(), int(x_), yo_, int(e.full_width()));
 593                 }
 594
 595                 // The line that indicates word in a different language
 596                 paintForeignMark(e);
 597
 598                 // change tracking (not for insets that handle it themselves)
 599                 if (e.type != Row::INSET || ! e.inset->canPaintChange(*pi_.base.bv))
 600                         paintChange(e);
 601
 602                 x_ += e.full_width();
 603         }
 604 }
 605
 606
 607 void RowPainter::paintSelection() const
 608 {
 609         if (!row_.selection())
 610                 return;
 611         Cursor const & curs = pi_.base.bv->cursor();
 612         DocIterator beg = curs.selectionBegin();
 613         beg.pit() = row_.pit();
 614         beg.pos() = row_.sel_beg;
 615
 616         DocIterator end = curs.selectionEnd();
 617         end.pit() = row_.pit();
 618         end.pos() = row_.sel_end;
 619
 620         bool const begin_boundary = beg.pos() >= row_.endpos();
 621         bool const end_boundary = row_.sel_end == row_.endpos();
 622
 623         DocIterator cur = beg;
 624         cur.boundary(begin_boundary);
 625         int x1 = text_metrics_.cursorX(beg.top(), begin_boundary);
 626         int x2 = text_metrics_.cursorX(end.top(), end_boundary);
 627         int const y1 = yo_ - row_.ascent();
 628         int const y2 = y1 + row_.height();
 629
 630         int const rm = text_.isMainText() ? pi_.base.bv->rightMargin() : 0;
 631         int const lm = text_.isMainText() ? pi_.base.bv->leftMargin() : 0;
 632
 633         // draw the margins
 634         if (row_.begin_margin_sel) {
 635                 if (text_.isRTL(beg.paragraph())) {
 636                         pi_.pain.fillRectangle(int(xo_ + x1), y1,
 637                                 text_metrics_.width() - rm - x1, y2 - y1, Color_selection);
 638                 } else {
 639                         pi_.pain.fillRectangle(int(xo_ + lm), y1, x1 - lm, y2 - y1,
 640                                 Color_selection);
 641                 }
 642         }
 643
 644         if (row_.end_margin_sel) {
 645                 if (text_.isRTL(beg.paragraph())) {
 646                         pi_.pain.fillRectangle(int(xo_ + lm), y1, x2 - lm, y2 - y1,
 647                                 Color_selection);
 648                 } else {
 649                         pi_.pain.fillRectangle(int(xo_ + x2), y1, text_metrics_.width() - rm - x2,
 650                                 y2 - y1, Color_selection);
 651                 }
 652         }
 653
 654         // if we are on a boundary from the beginning, it's probably
 655         // a RTL boundary and we jump to the other side directly as this
 656         // segement is 0-size and confuses the logic below
 657         if (cur.boundary())
 658                 cur.boundary(false);
 659
 660         // go through row and draw from RTL boundary to RTL boundary
 661         while (cur < end) {
 662                 bool draw_now = false;
 663
 664                 // simplified cursorForward code below which does not
 665                 // descend into insets and which does not go into the
 666                 // next line. Compare the logic with the original cursorForward
 667
 668                 // if left of boundary -> just jump to right side, but
 669                 // for RTL boundaries don't, because: abc|DDEEFFghi -> abcDDEEF|Fghi
 670                 if (cur.boundary()) {
 671                         cur.boundary(false);
 672                 }       else if (text_metrics_.isRTLBoundary(cur.pit(), cur.pos() + 1)) {
 673                         // in front of RTL boundary -> Stay on this side of the boundary
 674                         // because:  ab|cDDEEFFghi -> abc|DDEEFFghi
 675                         ++cur.pos();
 676                         cur.boundary(true);
 677                         draw_now = true;
 678                 } else {
 679                         // move right
 680                         ++cur.pos();
 681
 682                         // line end?
 683                         if (cur.pos() == row_.endpos())
 684                                 cur.boundary(true);
 685                 }
 686
 687                 if (x1 == -1) {
 688                         // the previous segment was just drawn, now the next starts
 689                         x1 = text_metrics_.cursorX(cur.top(), cur.boundary());
 690                 }
 691
 692                 if (!(cur < end) || draw_now) {
 693                         x2 = text_metrics_.cursorX(cur.top(), cur.boundary());
 694                         pi_.pain.fillRectangle(int(xo_ + min(x1, x2)), y1, abs(x2 - x1),
 695                                 y2 - y1, Color_selection);
 696
 697                         // reset x1, so it is set again next round (which will be on the
 698                         // right side of a boundary or at the selection end)
 699                         x1 = -1;
 700                 }
 701         }
 702 }
 703
 704
 705 } // namespace lyx