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(x_ + x1, y, x_ + x2, y, Color_error,
 208                               Painter::line_onoffdash, thickness);
 209                 pos = range.last + 1;
 210         }
 211 }
 212
 213
 214 void RowPainter::paintStringAndSel(Row::Element const & e) const
 215 {
 216         // at least part of text selected?
 217         bool const some_sel = (e.endpos >= row_.sel_beg && e.pos < row_.sel_end)
 218                 || pi_.selected;
 219         // all the text selected?
 220         bool const all_sel = (e.pos >= row_.sel_beg && e.endpos < row_.sel_end)
 221                 || pi_.selected;
 222
 223         if (all_sel || e.change.changed()) {
 224                 Font copy = e.font;
 225                 Color const col = e.change.changed() ? e.change.color()
 226                                                      : Color_selectiontext;
 227                 copy.fontInfo().setPaintColor(col);
 228                 pi_.pain.text(int(x_), yo_, e.str, copy, e.extra, e.full_width());
 229         } else if (!some_sel) {
 230                 pi_.pain.text(int(x_), yo_, e.str, e.font, e.extra, e.full_width());
 231         } else {
 232                 pi_.pain.text(int(x_), yo_, e.str, e.font, Color_selectiontext,
 233                               max(row_.sel_beg, e.pos) - e.pos,
 234                               min(row_.sel_end, e.endpos) - e.pos,
 235                               e.extra, e.full_width());
 236         }
 237 }
 238
 239
 240 void RowPainter::paintChange(Row::Element const & e) const
 241 {
 242         e.change.paintCue(pi_, x_, yo_, x_ + e.full_width(), e.font.fontInfo());
 243 }
 244
 245
 246 void RowPainter::paintChangeBar() const
 247 {
 248         pos_type const start = row_.pos();
 249         pos_type end = row_.endpos();
 250
 251         if (par_.size() == end) {
 252                 // this is the last row of the paragraph;
 253                 // thus, we must also consider the imaginary end-of-par character
 254                 end++;
 255         }
 256
 257         if (start == end || !par_.isChanged(start, end))
 258                 return;
 259
 260         int const height = text_metrics_.isLastRow(row_)
 261                 ? row_.ascent()
 262                 : row_.height();
 263
 264         pi_.pain.fillRectangle(5, yo_ - row_.ascent(), 3, height, Color_changebar);
 265 }
 266
 267
 268 void RowPainter::paintAppendix() const
 269 {
 270         // only draw the appendix frame once (for the main text)
 271         if (!par_.params().appendix() || !text_.isMainText())
 272                 return;
 273
 274         int y = yo_ - row_.ascent();
 275
 276         if (par_.params().startOfAppendix())
 277                 y += 2 * defaultRowHeight();
 278
 279         pi_.pain.line(1, y, 1, yo_ + row_.height(), Color_appendix);
 280         pi_.pain.line(width_ - 2, y, width_ - 2, yo_ + row_.height(), Color_appendix);
 281 }
 282
 283
 284 void RowPainter::paintDepthBar() const
 285 {
 286         depth_type const depth = par_.getDepth();
 287
 288         if (depth <= 0)
 289                 return;
 290
 291         depth_type prev_depth = 0;
 292         if (!text_metrics_.isFirstRow(row_)) {
 293                 pit_type pit2 = row_.pit();
 294                 if (row_.pos() == 0)
 295                         --pit2;
 296                 prev_depth = pars_[pit2].getDepth();
 297         }
 298
 299         depth_type next_depth = 0;
 300         if (!text_metrics_.isLastRow(row_)) {
 301                 pit_type pit2 = row_.pit();
 302                 if (row_.endpos() >= pars_[pit2].size())
 303                         ++pit2;
 304                 next_depth = pars_[pit2].getDepth();
 305         }
 306
 307         for (depth_type i = 1; i <= depth; ++i) {
 308                 int const w = nestMargin() / 5;
 309                 int x = int(xo_) + w * i;
 310                 // only consider the changebar space if we're drawing outermost text
 311                 if (text_.isMainText())
 312                         x += changebarMargin();
 313
 314                 int const starty = yo_ - row_.ascent();
 315                 int const h =  row_.height() - 1 - (i - next_depth - 1) * 3;
 316
 317                 pi_.pain.line(x, starty, x, starty + h, Color_depthbar);
 318
 319                 if (i > prev_depth)
 320                         pi_.pain.fillRectangle(x, starty, w, 2, Color_depthbar);
 321                 if (i > next_depth)
 322                         pi_.pain.fillRectangle(x, starty + h, w, 2, Color_depthbar);
 323         }
 324 }
 325
 326
 327 void RowPainter::paintAppendixStart(int y) const
 328 {
 329         FontInfo pb_font = sane_font;
 330         pb_font.setColor(Color_appendix);
 331         pb_font.decSize();
 332
 333         int w = 0;
 334         int a = 0;
 335         int d = 0;
 336
 337         docstring const label = _("Appendix");
 338         theFontMetrics(pb_font).rectText(label, w, a, d);
 339
 340         int const text_start = int(xo_ + (width_ - w) / 2);
 341         int const text_end = text_start + w;
 342
 343         pi_.pain.rectText(text_start, y + d, label, pb_font, Color_none, Color_none);
 344
 345         pi_.pain.line(int(xo_ + 1), y, text_start, y, Color_appendix);
 346         pi_.pain.line(text_end, y, int(xo_ + width_ - 2), y, Color_appendix);
 347 }
 348
 349
 350 void RowPainter::paintTooLargeMarks(bool const left, bool const right) const
 351 {
 352         if (left)
 353                 pi_.pain.line(pi_.base.dottedLineThickness(), yo_ - row_.ascent(),
 354                                           pi_.base.dottedLineThickness(), yo_ + row_.descent(),
 355                                           Color_scroll, Painter::line_onoffdash,
 356                               pi_.base.dottedLineThickness());
 357         if (right) {
 358                 int const wwidth =
 359                         pi_.base.bv->workWidth() - pi_.base.dottedLineThickness();
 360                 pi_.pain.line(wwidth, yo_ - row_.ascent(),
 361                                           wwidth, yo_ + row_.descent(),
 362                                           Color_scroll, Painter::line_onoffdash,
 363                               pi_.base.dottedLineThickness());
 364         }
 365 }
 366
 367
 368 void RowPainter::paintFirst() const
 369 {
 370         Layout const & layout = par_.layout();
 371
 372         // start of appendix?
 373         if (par_.params().startOfAppendix())
 374             paintAppendixStart(yo_ - row_.ascent() + 2 * defaultRowHeight());
 375
 376         bool const is_first =
 377                 text_.isFirstInSequence(row_.pit()) || !layout.isParagraphGroup();
 378         //lyxerr << "paintFirst: " << par_.id() << " is_seq: " << is_seq << endl;
 379
 380         if (layout.labelIsInline()
 381             && (layout.labeltype != LABEL_STATIC || is_first))
 382                 paintLabel();
 383         else if (is_first && layout.labelIsAbove())
 384                 paintTopLevelLabel();
 385 }
 386
 387
 388 void RowPainter::paintLabel() const
 389 {
 390         docstring const str = par_.labelString();
 391         if (str.empty())
 392                 return;
 393
 394         bool const is_rtl = text_.isRTL(par_);
 395         Layout const & layout = par_.layout();
 396         FontInfo const font = labelFont();
 397         FontMetrics const & fm = theFontMetrics(font);
 398         double x = x_;
 399
 400         if (is_rtl)
 401                 x = width_ - row_.right_margin + fm.width(layout.labelsep);
 402         else
 403                 x = x_ - fm.width(layout.labelsep) - fm.width(str);
 404
 405         pi_.pain.text(int(x), yo_, str, font);
 406 }
 407
 408
 409 void RowPainter::paintTopLevelLabel() const
 410 {
 411         BufferParams const & bparams = pi_.base.bv->buffer().params();
 412         bool const is_rtl = text_.isRTL(par_);
 413         ParagraphParameters const & pparams = par_.params();
 414         Layout const & layout = par_.layout();
 415         FontInfo const font = labelFont();
 416         docstring const str = par_.labelString();
 417         if (str.empty())
 418                 return;
 419
 420         double spacing_val = 1.0;
 421         if (!pparams.spacing().isDefault())
 422                 spacing_val = pparams.spacing().getValue();
 423         else
 424                 spacing_val = bparams.spacing().getValue();
 425
 426         FontMetrics const & fm = theFontMetrics(font);
 427
 428         int const labeladdon = int(fm.maxHeight()
 429                 * layout.spacing.getValue() * spacing_val);
 430
 431         int maxdesc =
 432                 int(fm.maxDescent() * layout.spacing.getValue() * spacing_val
 433                 + (layout.labelbottomsep * defaultRowHeight()));
 434
 435         double x = x_;
 436         if (layout.labeltype == LABEL_CENTERED) {
 437                 x = row_.left_margin + (width_ - row_.left_margin - row_.right_margin) / 2;
 438                 x -= fm.width(str) / 2;
 439         } else if (is_rtl) {
 440                 x = width_ - row_.right_margin - fm.width(str);
 441         }
 442         pi_.pain.text(int(x), yo_ - maxdesc - labeladdon, str, font);
 443 }
 444
 445
 446 /** Check if the current paragraph is the last paragraph in a
 447     proof environment */
 448 static int getEndLabel(pit_type p, Text const & text)
 449 {
 450         ParagraphList const & pars = text.paragraphs();
 451         pit_type pit = p;
 452         depth_type par_depth = pars[p].getDepth();
 453         while (pit != pit_type(pars.size())) {
 454                 Layout const & layout = pars[pit].layout();
 455                 int const endlabeltype = layout.endlabeltype;
 456
 457                 if (endlabeltype != END_LABEL_NO_LABEL) {
 458                         if (p + 1 == pit_type(pars.size()))
 459                                 return endlabeltype;
 460
 461                         depth_type const next_depth =
 462                                 pars[p + 1].getDepth();
 463                         if (par_depth > next_depth ||
 464                             (par_depth == next_depth && layout != pars[p + 1].layout()))
 465                                 return endlabeltype;
 466                         break;
 467                 }
 468                 if (par_depth == 0)
 469                         break;
 470                 pit = text.outerHook(pit);
 471                 if (pit != pit_type(pars.size()))
 472                         par_depth = pars[pit].getDepth();
 473         }
 474         return END_LABEL_NO_LABEL;
 475 }
 476
 477
 478 void RowPainter::paintLast() const
 479 {
 480         bool const is_rtl = text_.isRTL(par_);
 481         int const endlabel = getEndLabel(row_.pit(), text_);
 482
 483         // paint imaginary end-of-paragraph character
 484
 485         Change const & change = par_.lookupChange(par_.size());
 486         if (change.changed()) {
 487                 FontMetrics const & fm =
 488                         theFontMetrics(pi_.base.bv->buffer().params().getFont());
 489                 int const length = fm.maxAscent() / 2;
 490                 Color col = change.color();
 491
 492                 pi_.pain.line(int(x_) + 1, yo_ + 2, int(x_) + 1, yo_ + 2 - length, col,
 493                            Painter::line_solid, 3);
 494
 495                 if (change.deleted()) {
 496                         pi_.pain.line(int(x_) + 1 - length, yo_ + 2, int(x_) + 1 + length,
 497                                 yo_ + 2, col, Painter::line_solid, 3);
 498                 } else {
 499                         pi_.pain.line(int(x_) + 1 - length, yo_ + 2, int(x_) + 1,
 500                                 yo_ + 2, col, Painter::line_solid, 3);
 501                 }
 502         }
 503
 504         // draw an endlabel
 505
 506         switch (endlabel) {
 507         case END_LABEL_BOX:
 508         case END_LABEL_FILLED_BOX: {
 509                 FontInfo const font = labelFont();
 510                 FontMetrics const & fm = theFontMetrics(font);
 511                 int const size = int(0.75 * fm.maxAscent());
 512                 int const y = yo_ - size;
 513                 int const max_row_width = width_ - size - Inset::TEXT_TO_INSET_OFFSET;
 514                 int x = is_rtl ? nestMargin() + changebarMargin()
 515                         : max_row_width - row_.right_margin;
 516
 517                 // If needed, move the box a bit to avoid overlapping with text.
 518                 int const rem = max_row_width - row_.width();
 519                 if (rem <= 0)
 520                         x += is_rtl ? rem : - rem;
 521
 522                 if (endlabel == END_LABEL_BOX)
 523                         pi_.pain.rectangle(x, y, size, size, Color_eolmarker);
 524                 else
 525                         pi_.pain.fillRectangle(x, y, size, size, Color_eolmarker);
 526                 break;
 527         }
 528
 529         case END_LABEL_STATIC: {
 530                 FontInfo const font = labelFont();
 531                 FontMetrics const & fm = theFontMetrics(font);
 532                 docstring const & str = par_.layout().endlabelstring();
 533                 double const x = is_rtl ? x_ - fm.width(str) : x_;
 534                 pi_.pain.text(int(x), yo_, str, font);
 535                 break;
 536         }
 537
 538         case END_LABEL_NO_LABEL:
 539                 break;
 540         }
 541 }
 542
 543
 544 void RowPainter::paintOnlyInsets()
 545 {
 546         Row::const_iterator cit = row_.begin();
 547         Row::const_iterator const & end = row_.end();
 548         for ( ; cit != end ; ++cit) {
 549                 Row::Element const & e = *cit;
 550                 if (e.type == Row::INSET) {
 551                         // If outer row has changed, nested insets are repainted completely.
 552                         // FIXME: check what this really does. The test is weird.
 553                         bool const nested_inset =
 554                                 (e.inset->asInsetMath() && !e.inset->asInsetMath()->asMacroTemplate())
 555                                 || e.inset->asInsetText() || e.inset->asInsetTabular();
 556                         if (nested_inset)
 557                                 paintInset(e);
 558                 }
 559                 x_ += e.full_width();
 560         }
 561 }
 562
 563
 564 void RowPainter::paintText()
 565 {
 566         Row::const_iterator cit = row_.begin();
 567         Row::const_iterator const & end = row_.end();
 568         for ( ; cit != end ; ++cit) {
 569                 Row::Element const & e = *cit;
 570
 571                 switch (e.type) {
 572                 case Row::STRING:
 573                 case Row::VIRTUAL:
 574                         paintStringAndSel(e);
 575
 576                         // Paint the spelling marks if enabled.
 577                         if (lyxrc.spellcheck_continuously && pi_.do_spellcheck && pi_.pain.isDrawingEnabled())
 578                                 paintMisspelledMark(e);
 579                         break;
 580
 581                 case Row::INSET:
 582                         paintInset(e);
 583                         break;
 584
 585                 case Row::SPACE:
 586                         pi_.pain.textDecoration(e.font.fontInfo(), int(x_), yo_, int(e.full_width()));
 587                 }
 588
 589                 // The line that indicates word in a different language
 590                 paintForeignMark(e);
 591
 592                 // change tracking (not for insets that handle it themselves)
 593                 if (e.type != Row::INSET || ! e.inset->canPaintChange(*pi_.base.bv))
 594                         paintChange(e);
 595
 596                 x_ += e.full_width();
 597         }
 598 }
 599
 600
 601 void RowPainter::paintSelection() const
 602 {
 603         if (!row_.selection())
 604                 return;
 605         Cursor const & curs = pi_.base.bv->cursor();
 606         DocIterator beg = curs.selectionBegin();
 607         beg.pit() = row_.pit();
 608         beg.pos() = row_.sel_beg;
 609
 610         DocIterator end = curs.selectionEnd();
 611         end.pit() = row_.pit();
 612         end.pos() = row_.sel_end;
 613
 614         bool const begin_boundary = beg.pos() >= row_.endpos();
 615         bool const end_boundary = row_.sel_end == row_.endpos();
 616
 617         DocIterator cur = beg;
 618         cur.boundary(begin_boundary);
 619         int x1 = text_metrics_.cursorX(beg.top(), begin_boundary);
 620         int x2 = text_metrics_.cursorX(end.top(), end_boundary);
 621         int const y1 = yo_ - row_.ascent();
 622         int const y2 = y1 + row_.height();
 623
 624         int const rm = text_.isMainText() ? pi_.base.bv->rightMargin() : 0;
 625         int const lm = text_.isMainText() ? pi_.base.bv->leftMargin() : 0;
 626
 627         // draw the margins
 628         if (row_.begin_margin_sel) {
 629                 if (text_.isRTL(beg.paragraph())) {
 630                         pi_.pain.fillRectangle(int(xo_ + x1), y1,
 631                                 text_metrics_.width() - rm - x1, y2 - y1, Color_selection);
 632                 } else {
 633                         pi_.pain.fillRectangle(int(xo_ + lm), y1, x1 - lm, y2 - y1,
 634                                 Color_selection);
 635                 }
 636         }
 637
 638         if (row_.end_margin_sel) {
 639                 if (text_.isRTL(beg.paragraph())) {
 640                         pi_.pain.fillRectangle(int(xo_ + lm), y1, x2 - lm, y2 - y1,
 641                                 Color_selection);
 642                 } else {
 643                         pi_.pain.fillRectangle(int(xo_ + x2), y1, text_metrics_.width() - rm - x2,
 644                                 y2 - y1, Color_selection);
 645                 }
 646         }
 647
 648         // if we are on a boundary from the beginning, it's probably
 649         // a RTL boundary and we jump to the other side directly as this
 650         // segement is 0-size and confuses the logic below
 651         if (cur.boundary())
 652                 cur.boundary(false);
 653
 654         // go through row and draw from RTL boundary to RTL boundary
 655         while (cur < end) {
 656                 bool draw_now = false;
 657
 658                 // simplified cursorForward code below which does not
 659                 // descend into insets and which does not go into the
 660                 // next line. Compare the logic with the original cursorForward
 661
 662                 // if left of boundary -> just jump to right side, but
 663                 // for RTL boundaries don't, because: abc|DDEEFFghi -> abcDDEEF|Fghi
 664                 if (cur.boundary()) {
 665                         cur.boundary(false);
 666                 }       else if (text_metrics_.isRTLBoundary(cur.pit(), cur.pos() + 1)) {
 667                         // in front of RTL boundary -> Stay on this side of the boundary
 668                         // because:  ab|cDDEEFFghi -> abc|DDEEFFghi
 669                         ++cur.pos();
 670                         cur.boundary(true);
 671                         draw_now = true;
 672                 } else {
 673                         // move right
 674                         ++cur.pos();
 675
 676                         // line end?
 677                         if (cur.pos() == row_.endpos())
 678                                 cur.boundary(true);
 679                 }
 680
 681                 if (x1 == -1) {
 682                         // the previous segment was just drawn, now the next starts
 683                         x1 = text_metrics_.cursorX(cur.top(), cur.boundary());
 684                 }
 685
 686                 if (!(cur < end) || draw_now) {
 687                         x2 = text_metrics_.cursorX(cur.top(), cur.boundary());
 688                         pi_.pain.fillRectangle(int(xo_ + min(x1, x2)), y1, abs(x2 - x1),
 689                                 y2 - y1, Color_selection);
 690
 691                         // reset x1, so it is set again next round (which will be on the
 692                         // right side of a boundary or at the selection end)
 693                         x1 = -1;
 694                 }
 695         }
 696 }
 697
 698
 699 } // namespace lyx