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