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, pit_type pit, 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), pit_(pit), par_(text.paragraphs()[pit]),
  62           pm_(text_metrics_.parMetrics(pit)), change_(pi_.change_),
  63           xo_(x), yo_(y), width_(text_metrics_.width()),
  64           solid_line_thickness_(1), solid_line_offset_(1),
  65           dotted_line_thickness_(1)
  66 {
  67         if (lyxrc.zoom >= 200) {
  68                 // derive the line thickness from zoom factor
  69                 // the zoom is given in percent
  70                 // (increase thickness at 250%, 450% etc.)
  71                 solid_line_thickness_ = (lyxrc.zoom + 50) / 200;
  72                 // adjust line_offset_ too
  73                 solid_line_offset_ = 1 + solid_line_thickness_ / 2;
  74         }
  75         if (lyxrc.zoom >= 100) {
  76                 // derive the line thickness from zoom factor
  77                 // the zoom is given in percent
  78                 // (increase thickness at 150%, 250% etc.)
  79                 dotted_line_thickness_ = (lyxrc.zoom + 50) / 100;
  80         }
  81
  82         x_ = row_.left_margin + xo_;
  83
  84         //lyxerr << "RowPainter: x: " << x_ << " xo: " << xo_ << " yo: " << yo_ << endl;
  85         //row_.dump();
  86
  87         LBUFERR(pit >= 0);
  88         LBUFERR(pit < int(text.paragraphs().size()));
  89 }
  90
  91
  92 FontInfo RowPainter::labelFont() const
  93 {
  94         FontInfo f = text_.labelFont(par_);
  95         // selected text?
  96         if (row_.begin_margin_sel || pi_.selected)
  97                 f.setPaintColor(Color_selectiontext);
  98         return f;
  99 }
 100
 101
 102 // If you want to debug inset metrics uncomment the following line:
 103 //#define DEBUG_METRICS
 104 // This draws green lines around each inset.
 105
 106
 107 void RowPainter::paintInset(Row::Element const & e)
 108 {
 109         // Handle selection
 110         bool const pi_selected = pi_.selected;
 111         Cursor const & cur = pi_.base.bv->cursor();
 112         if (cur.selection() && cur.text() == &text_
 113                 && cur.normalAnchor().text() == &text_)
 114                 pi_.selected = row_.sel_beg <= e.pos && row_.sel_end > e.pos;
 115
 116         LASSERT(e.inset, return);
 117         // Backup full_repaint status because some insets (InsetTabular)
 118         // requires a full repaint
 119         bool const pi_full_repaint = pi_.full_repaint;
 120         bool const pi_do_spellcheck = pi_.do_spellcheck;
 121         Change const pi_change = pi_.change_;
 122
 123         pi_.base.font = e.inset->inheritFont() ? e.font.fontInfo() :
 124                 pi_.base.bv->buffer().params().getFont().fontInfo();
 125         pi_.ltr_pos = !e.font.isVisibleRightToLeft();
 126         pi_.change_ = change_.changed() ? change_ : e.change;
 127         pi_.do_spellcheck &= e.inset->allowSpellCheck();
 128
 129         int const x1 = int(x_);
 130         pi_.base.bv->coordCache().insets().add(e.inset, x1, yo_);
 131         // insets are painted completely. Recursive
 132         // FIXME: it is wrong to completely paint the background
 133         // if we want to do single row painting.
 134         e.inset->drawBackground(pi_, x1, yo_);
 135         e.inset->drawSelection(pi_, x1, yo_);
 136         e.inset->draw(pi_, x1, yo_);
 137
 138         Dimension const & dim = pi_.base.bv->coordCache().insets().dim(e.inset);
 139
 140         paintForeignMark(x_, e.font.language(), dim.descent());
 141
 142         x_ += dim.width();
 143
 144         // Restore full_repaint status.
 145         pi_.full_repaint = pi_full_repaint;
 146         pi_.change_ = pi_change;
 147         pi_.do_spellcheck = pi_do_spellcheck;
 148         pi_.selected = pi_selected;
 149
 150 #ifdef DEBUG_METRICS
 151         int const x2 = x1 + dim.wid;
 152         int const y1 = yo_ + dim.des;
 153         int const y2 = yo_ - dim.asc;
 154         pi_.pain.line(x1, y1, x1, y2, Color_green);
 155         pi_.pain.line(x1, y1, x2, y1, Color_green);
 156         pi_.pain.line(x2, y1, x2, y2, Color_green);
 157         pi_.pain.line(x1, y2, x2, y2, Color_green);
 158 #endif
 159 }
 160
 161
 162 void RowPainter::paintForeignMark(double orig_x, Language const * lang, int desc) const
 163 {
 164         if (!lyxrc.mark_foreign_language)
 165                 return;
 166         if (lang == latex_language)
 167                 return;
 168         if (lang == pi_.base.bv->buffer().params().language)
 169                 return;
 170
 171         int const y = yo_ + solid_line_offset_ + desc + solid_line_thickness_ / 2;
 172         pi_.pain.line(int(orig_x), y, int(x_), y, Color_language,
 173                 Painter::line_solid, solid_line_thickness_);
 174 }
 175
 176
 177 void RowPainter::paintMisspelledMark(double const orig_x,
 178                                      Row::Element const & e) const
 179 {
 180         // if changed the misspelled marker gets placed slightly lower than normal
 181         // to avoid drawing at the same vertical offset
 182         FontMetrics const & fm = theFontMetrics(e.font);
 183         int const thickness = max(fm.lineWidth(), 2);
 184         int const y = yo_ + solid_line_offset_ + solid_line_thickness_
 185                 + (e.change.changed() ? solid_line_thickness_ + 1 : 0)
 186                 + 1 + thickness / 2;
 187
 188         //FIXME: this could be computed only once, it is probably not costly.
 189         // check for cursor position
 190         // don't draw misspelled marker for words at cursor position
 191         // we don't want to disturb the process of text editing
 192         DocIterator const nw = pi_.base.bv->cursor().newWord();
 193         pos_type cpos = -1;
 194         if (!nw.empty() && par_.id() == nw.paragraph().id()) {
 195                 cpos = nw.pos();
 196                 if (cpos > 0 && cpos == par_.size() && !par_.isWordSeparator(cpos-1))
 197                         --cpos;
 198                 else if (cpos > 0 && par_.isWordSeparator(cpos))
 199                         --cpos;
 200         }
 201
 202         pos_type pos = e.pos;
 203         while (pos < e.pos + pos_type(e.str.length())) {
 204                 if (!par_.isMisspelled(pos)) {
 205                         ++pos;
 206                         continue;
 207                 }
 208
 209                 FontSpan const & range = par_.getSpellRange(pos);
 210
 211                 // Skip element which are being edited
 212                 if (range.contains(cpos)) {
 213                         // the range includes the last element
 214                         pos = range.last + 1;
 215                         continue;
 216                 }
 217
 218                 FontMetrics const & fm = theFontMetrics(e.font);
 219                 int x1 = fm.pos2x(e.str, range.first - e.pos,
 220                                   e.isRTL(), e.extra);
 221                 int x2 = fm.pos2x(e.str, min(range.last - e.pos + 1,
 222                                                                          pos_type(e.str.length())),
 223                                                                          e.isRTL(), e.extra);
 224                 if (x1 > x2)
 225                         swap(x1, x2);
 226
 227                 pi_.pain.line(int(orig_x) + x1, y, int(orig_x) + x2, y,
 228                               Color_error,
 229                               Painter::line_onoffdash, thickness);
 230                 pos = range.last + 1;
 231         }
 232 }
 233
 234
 235 void RowPainter::paintStringAndSel(Row::Element const & e)
 236 {
 237         // at least part of text selected?
 238         bool const some_sel = (e.endpos >= row_.sel_beg && e.pos < row_.sel_end)
 239                 || pi_.selected;
 240         // all the text selected?
 241         bool const all_sel = (e.pos >= row_.sel_beg && e.endpos < row_.sel_end)
 242                 || pi_.selected;
 243
 244         if (all_sel || e.change.changed()) {
 245                 Font copy = e.font;
 246                 Color const col = e.change.changed() ? e.change.color()
 247                                                      : Color_selectiontext;
 248                 copy.fontInfo().setPaintColor(col);
 249                 pi_.pain.text(int(x_), yo_, e.str, copy, e.extra, e.full_width());
 250         } else if (!some_sel) {
 251                 pi_.pain.text(int(x_), yo_, e.str, e.font, e.extra, e.full_width());
 252         } else {
 253                 pi_.pain.text(int(x_), yo_, e.str, e.font, Color_selectiontext,
 254                               max(row_.sel_beg, e.pos) - e.pos,
 255                               min(row_.sel_end, e.endpos) - e.pos,
 256                               e.extra, e.full_width());
 257         }
 258         x_ += e.full_width();
 259 }
 260
 261
 262 void RowPainter::paintChange(double orig_x, Font const & font,
 263                              Change const & change) const
 264 {
 265         if (!change.changed())
 266                 return;
 267         // Calculate 1/3 height of font
 268         FontMetrics const & fm = theFontMetrics(font);
 269         int const y_bar = change.deleted() ? yo_ - fm.maxAscent() / 3
 270                 : yo_ + 2 * solid_line_offset_ + solid_line_thickness_;
 271         pi_.pain.line(int(orig_x), y_bar, int(x_), y_bar,
 272                       change.color(), Painter::line_solid, solid_line_thickness_);
 273 }
 274
 275
 276 void RowPainter::paintChangeBar() const
 277 {
 278         pos_type const start = row_.pos();
 279         pos_type end = row_.endpos();
 280
 281         if (par_.size() == end) {
 282                 // this is the last row of the paragraph;
 283                 // thus, we must also consider the imaginary end-of-par character
 284                 end++;
 285         }
 286
 287         if (start == end || !par_.isChanged(start, end))
 288                 return;
 289
 290         int const height = text_metrics_.isLastRow(pit_, row_)
 291                 ? row_.ascent()
 292                 : row_.height();
 293
 294         pi_.pain.fillRectangle(5, yo_ - row_.ascent(), 3, height, Color_changebar);
 295 }
 296
 297
 298 void RowPainter::paintAppendix() const
 299 {
 300         // only draw the appendix frame once (for the main text)
 301         if (!par_.params().appendix() || !text_.isMainText())
 302                 return;
 303
 304         int y = yo_ - row_.ascent();
 305
 306         if (par_.params().startOfAppendix())
 307                 y += 2 * defaultRowHeight();
 308
 309         pi_.pain.line(1, y, 1, yo_ + row_.height(), Color_appendix);
 310         pi_.pain.line(width_ - 2, y, width_ - 2, yo_ + row_.height(), Color_appendix);
 311 }
 312
 313
 314 void RowPainter::paintDepthBar() const
 315 {
 316         depth_type const depth = par_.getDepth();
 317
 318         if (depth <= 0)
 319                 return;
 320
 321         depth_type prev_depth = 0;
 322         if (!text_metrics_.isFirstRow(pit_, row_)) {
 323                 pit_type pit2 = pit_;
 324                 if (row_.pos() == 0)
 325                         --pit2;
 326                 prev_depth = pars_[pit2].getDepth();
 327         }
 328
 329         depth_type next_depth = 0;
 330         if (!text_metrics_.isLastRow(pit_, row_)) {
 331                 pit_type pit2 = pit_;
 332                 if (row_.endpos() >= pars_[pit2].size())
 333                         ++pit2;
 334                 next_depth = pars_[pit2].getDepth();
 335         }
 336
 337         for (depth_type i = 1; i <= depth; ++i) {
 338                 int const w = nestMargin() / 5;
 339                 int x = int(xo_) + w * i;
 340                 // only consider the changebar space if we're drawing outermost text
 341                 if (text_.isMainText())
 342                         x += changebarMargin();
 343
 344                 int const starty = yo_ - row_.ascent();
 345                 int const h =  row_.height() - 1 - (i - next_depth - 1) * 3;
 346
 347                 pi_.pain.line(x, starty, x, starty + h, Color_depthbar);
 348
 349                 if (i > prev_depth)
 350                         pi_.pain.fillRectangle(x, starty, w, 2, Color_depthbar);
 351                 if (i > next_depth)
 352                         pi_.pain.fillRectangle(x, starty + h, w, 2, Color_depthbar);
 353         }
 354 }
 355
 356
 357 void RowPainter::paintAppendixStart(int y) const
 358 {
 359         FontInfo pb_font = sane_font;
 360         pb_font.setColor(Color_appendix);
 361         pb_font.decSize();
 362
 363         int w = 0;
 364         int a = 0;
 365         int d = 0;
 366
 367         docstring const label = _("Appendix");
 368         theFontMetrics(pb_font).rectText(label, w, a, d);
 369
 370         int const text_start = int(xo_ + (width_ - w) / 2);
 371         int const text_end = text_start + w;
 372
 373         pi_.pain.rectText(text_start, y + d, label, pb_font, Color_none, Color_none);
 374
 375         pi_.pain.line(int(xo_ + 1), y, text_start, y, Color_appendix);
 376         pi_.pain.line(text_end, y, int(xo_ + width_ - 2), y, Color_appendix);
 377 }
 378
 379
 380 void RowPainter::paintTooLargeMarks(bool const left, bool const right) const
 381 {
 382         if (left)
 383                 pi_.pain.line(dotted_line_thickness_, yo_ - row_.ascent(),
 384                                           dotted_line_thickness_, yo_ + row_.descent(),
 385                                           Color_scroll,
 386                                           Painter::line_onoffdash, dotted_line_thickness_);
 387         if (right) {
 388                 int const wwidth = pi_.base.bv->workWidth() - dotted_line_thickness_;
 389                 pi_.pain.line(wwidth, yo_ - row_.ascent(),
 390                                           wwidth, yo_ + row_.descent(),
 391                                           Color_scroll,
 392                                           Painter::line_onoffdash, dotted_line_thickness_);
 393         }
 394 }
 395
 396
 397 void RowPainter::paintFirst() const
 398 {
 399         Layout const & layout = par_.layout();
 400
 401         // start of appendix?
 402         if (par_.params().startOfAppendix())
 403             paintAppendixStart(yo_ - row_.ascent() + 2 * defaultRowHeight());
 404
 405         bool const is_first =
 406                 text_.isFirstInSequence(pit_) || !layout.isParagraphGroup();
 407         //lyxerr << "paintFirst: " << par_.id() << " is_seq: " << is_seq << endl;
 408
 409         if (layout.labelIsInline()
 410             && (layout.labeltype != LABEL_STATIC || is_first))
 411                 paintLabel();
 412         else if (is_first && layout.labelIsAbove())
 413                 paintTopLevelLabel();
 414 }
 415
 416
 417 void RowPainter::paintLabel() const
 418 {
 419         docstring const str = par_.labelString();
 420         if (str.empty())
 421                 return;
 422
 423         bool const is_rtl = text_.isRTL(par_);
 424         Layout const & layout = par_.layout();
 425         FontInfo const font = labelFont();
 426         FontMetrics const & fm = theFontMetrics(font);
 427         double x = x_;
 428
 429         if (is_rtl)
 430                 x = width_ - row_.right_margin + fm.width(layout.labelsep);
 431         else
 432                 x = x_ - fm.width(layout.labelsep) - fm.width(str);
 433
 434         pi_.pain.text(int(x), yo_, str, font);
 435 }
 436
 437
 438 void RowPainter::paintTopLevelLabel() const
 439 {
 440         BufferParams const & bparams = pi_.base.bv->buffer().params();
 441         bool const is_rtl = text_.isRTL(par_);
 442         ParagraphParameters const & pparams = par_.params();
 443         Layout const & layout = par_.layout();
 444         FontInfo const font = labelFont();
 445         docstring const str = par_.labelString();
 446         if (str.empty())
 447                 return;
 448
 449         double spacing_val = 1.0;
 450         if (!pparams.spacing().isDefault())
 451                 spacing_val = pparams.spacing().getValue();
 452         else
 453                 spacing_val = bparams.spacing().getValue();
 454
 455         FontMetrics const & fm = theFontMetrics(font);
 456
 457         int const labeladdon = int(fm.maxHeight()
 458                 * layout.spacing.getValue() * spacing_val);
 459
 460         int maxdesc =
 461                 int(fm.maxDescent() * layout.spacing.getValue() * spacing_val
 462                 + (layout.labelbottomsep * defaultRowHeight()));
 463
 464         double x = x_;
 465         if (layout.labeltype == LABEL_CENTERED) {
 466                 x = row_.left_margin + (width_ - row_.left_margin - row_.right_margin) / 2;
 467                 x -= fm.width(str) / 2;
 468         } else if (is_rtl) {
 469                 x = width_ - row_.right_margin - fm.width(str);
 470         }
 471         pi_.pain.text(int(x), yo_ - maxdesc - labeladdon, str, font);
 472 }
 473
 474
 475 /** Check if the current paragraph is the last paragraph in a
 476     proof environment */
 477 static int getEndLabel(pit_type p, Text const & text)
 478 {
 479         ParagraphList const & pars = text.paragraphs();
 480         pit_type pit = p;
 481         depth_type par_depth = pars[p].getDepth();
 482         while (pit != pit_type(pars.size())) {
 483                 Layout const & layout = pars[pit].layout();
 484                 int const endlabeltype = layout.endlabeltype;
 485
 486                 if (endlabeltype != END_LABEL_NO_LABEL) {
 487                         if (p + 1 == pit_type(pars.size()))
 488                                 return endlabeltype;
 489
 490                         depth_type const next_depth =
 491                                 pars[p + 1].getDepth();
 492                         if (par_depth > next_depth ||
 493                             (par_depth == next_depth && layout != pars[p + 1].layout()))
 494                                 return endlabeltype;
 495                         break;
 496                 }
 497                 if (par_depth == 0)
 498                         break;
 499                 pit = text.outerHook(pit);
 500                 if (pit != pit_type(pars.size()))
 501                         par_depth = pars[pit].getDepth();
 502         }
 503         return END_LABEL_NO_LABEL;
 504 }
 505
 506
 507 void RowPainter::paintLast()
 508 {
 509         bool const is_rtl = text_.isRTL(par_);
 510         int const endlabel = getEndLabel(pit_, text_);
 511
 512         // paint imaginary end-of-paragraph character
 513
 514         Change const & change = par_.lookupChange(par_.size());
 515         if (change.changed()) {
 516                 FontMetrics const & fm =
 517                         theFontMetrics(pi_.base.bv->buffer().params().getFont());
 518                 int const length = fm.maxAscent() / 2;
 519                 Color col = change.color();
 520
 521                 pi_.pain.line(int(x_) + 1, yo_ + 2, int(x_) + 1, yo_ + 2 - length, col,
 522                            Painter::line_solid, 3);
 523
 524                 if (change.deleted()) {
 525                         pi_.pain.line(int(x_) + 1 - length, yo_ + 2, int(x_) + 1 + length,
 526                                 yo_ + 2, col, Painter::line_solid, 3);
 527                 } else {
 528                         pi_.pain.line(int(x_) + 1 - length, yo_ + 2, int(x_) + 1,
 529                                 yo_ + 2, col, Painter::line_solid, 3);
 530                 }
 531         }
 532
 533         // draw an endlabel
 534
 535         switch (endlabel) {
 536         case END_LABEL_BOX:
 537         case END_LABEL_FILLED_BOX: {
 538                 FontInfo const font = labelFont();
 539                 FontMetrics const & fm = theFontMetrics(font);
 540                 int const size = int(0.75 * fm.maxAscent());
 541                 int const y = yo_ - size;
 542                 int const max_row_width = width_ - size - Inset::TEXT_TO_INSET_OFFSET;
 543                 int x = is_rtl ? nestMargin() + changebarMargin()
 544                         : max_row_width - row_.right_margin;
 545
 546                 // If needed, move the box a bit to avoid overlapping with text.
 547                 int const rem = max_row_width - row_.width();
 548                 if (rem <= 0)
 549                         x += is_rtl ? rem : - rem;
 550
 551                 if (endlabel == END_LABEL_BOX)
 552                         pi_.pain.rectangle(x, y, size, size, Color_eolmarker);
 553                 else
 554                         pi_.pain.fillRectangle(x, y, size, size, Color_eolmarker);
 555                 break;
 556         }
 557
 558         case END_LABEL_STATIC: {
 559                 FontInfo const font = labelFont();
 560                 FontMetrics const & fm = theFontMetrics(font);
 561                 docstring const & str = par_.layout().endlabelstring();
 562                 double const x = is_rtl ? x_ - fm.width(str) : x_;
 563                 pi_.pain.text(int(x), yo_, str, font);
 564                 break;
 565         }
 566
 567         case END_LABEL_NO_LABEL:
 568                 break;
 569         }
 570 }
 571
 572
 573 void RowPainter::paintOnlyInsets()
 574 {
 575         Row::const_iterator cit = row_.begin();
 576         Row::const_iterator const & end = row_.end();
 577         for ( ; cit != end ; ++cit) {
 578                 Row::Element const & e = *cit;
 579                 if (e.type == Row::INSET) {
 580                         // If outer row has changed, nested insets are repainted completely.
 581                         bool const nested_inset =
 582                                 (e.inset->asInsetMath() && !e.inset->asInsetMath()->asMacroTemplate())
 583                                 || e.inset->asInsetText() || e.inset->asInsetTabular();
 584                         if (!nested_inset) {
 585                                 x_ += e.full_width();
 586                                 continue;
 587                         }
 588                         paintInset(e);
 589                 } else
 590                         x_ += e.full_width();
 591         }
 592 }
 593
 594
 595 void RowPainter::paintText()
 596 {
 597         Row::const_iterator cit = row_.begin();
 598         Row::const_iterator const & end = row_.end();
 599         for ( ; cit != end ; ++cit) {
 600                 double const orig_x = x_;
 601                 Row::Element const & e = *cit;
 602                 int foreign_descent = 0;
 603
 604                 switch (e.type) {
 605                 case Row::STRING:
 606                 case Row::VIRTUAL:
 607                         paintStringAndSel(e);
 608
 609                         // Paint the spelling marks if enabled.
 610                         if (lyxrc.spellcheck_continuously && pi_.do_spellcheck && pi_.pain.isDrawingEnabled())
 611                                 paintMisspelledMark(orig_x, e);
 612                         break;
 613                 case Row::INSET: {
 614                         // If outer row has changed, nested insets are repainted completely.
 615                         paintInset(e);
 616                         foreign_descent = e.dim.descent();
 617                 }
 618                         break;
 619                 case Row::SPACE:
 620                         pi_.pain.textDecoration(e.font.fontInfo(), int(x_), yo_, int(e.full_width()));
 621                         x_ += e.full_width();
 622                 }
 623
 624                 // The line that indicates word in a different language
 625                 paintForeignMark(orig_x, e.font.language(), foreign_descent);
 626
 627                 // change tracking (not for insets that track their own changes)
 628                 if (e.type != Row::INSET || ! e.inset->canTrackChanges())
 629                         paintChange(orig_x, e.font, e.change);
 630         }
 631 }
 632
 633
 634 void RowPainter::paintSelection() const
 635 {
 636         if (!row_.selection())
 637                 return;
 638         Cursor const & curs = pi_.base.bv->cursor();
 639         DocIterator beg = curs.selectionBegin();
 640         beg.pit() = pit_;
 641         beg.pos() = row_.sel_beg;
 642
 643         DocIterator end = curs.selectionEnd();
 644         end.pit() = pit_;
 645         end.pos() = row_.sel_end;
 646
 647         bool const begin_boundary = beg.pos() >= row_.endpos();
 648         bool const end_boundary = row_.sel_end == row_.endpos();
 649
 650         DocIterator cur = beg;
 651         cur.boundary(begin_boundary);
 652         int x1 = text_metrics_.cursorX(beg.top(), begin_boundary);
 653         int x2 = text_metrics_.cursorX(end.top(), end_boundary);
 654         int const y1 = yo_ - row_.ascent();
 655         int const y2 = y1 + row_.height();
 656
 657         int const rm = text_.isMainText() ? pi_.base.bv->rightMargin() : 0;
 658         int const lm = text_.isMainText() ? pi_.base.bv->leftMargin() : 0;
 659
 660         // draw the margins
 661         if (row_.begin_margin_sel) {
 662                 if (text_.isRTL(beg.paragraph())) {
 663                         pi_.pain.fillRectangle(int(xo_ + x1), y1,
 664                                 text_metrics_.width() - rm - x1, y2 - y1, Color_selection);
 665                 } else {
 666                         pi_.pain.fillRectangle(int(xo_ + lm), y1, x1 - lm, y2 - y1,
 667                                 Color_selection);
 668                 }
 669         }
 670
 671         if (row_.end_margin_sel) {
 672                 if (text_.isRTL(beg.paragraph())) {
 673                         pi_.pain.fillRectangle(int(xo_ + lm), y1, x2 - lm, y2 - y1,
 674                                 Color_selection);
 675                 } else {
 676                         pi_.pain.fillRectangle(int(xo_ + x2), y1, text_metrics_.width() - rm - x2,
 677                                 y2 - y1, Color_selection);
 678                 }
 679         }
 680
 681         // if we are on a boundary from the beginning, it's probably
 682         // a RTL boundary and we jump to the other side directly as this
 683         // segement is 0-size and confuses the logic below
 684         if (cur.boundary())
 685                 cur.boundary(false);
 686
 687         // go through row and draw from RTL boundary to RTL boundary
 688         while (cur < end) {
 689                 bool draw_now = false;
 690
 691                 // simplified cursorForward code below which does not
 692                 // descend into insets and which does not go into the
 693                 // next line. Compare the logic with the original cursorForward
 694
 695                 // if left of boundary -> just jump to right side, but
 696                 // for RTL boundaries don't, because: abc|DDEEFFghi -> abcDDEEF|Fghi
 697                 if (cur.boundary()) {
 698                         cur.boundary(false);
 699                 }       else if (text_metrics_.isRTLBoundary(cur.pit(), cur.pos() + 1)) {
 700                         // in front of RTL boundary -> Stay on this side of the boundary
 701                         // because:  ab|cDDEEFFghi -> abc|DDEEFFghi
 702                         ++cur.pos();
 703                         cur.boundary(true);
 704                         draw_now = true;
 705                 } else {
 706                         // move right
 707                         ++cur.pos();
 708
 709                         // line end?
 710                         if (cur.pos() == row_.endpos())
 711                                 cur.boundary(true);
 712                 }
 713
 714                 if (x1 == -1) {
 715                         // the previous segment was just drawn, now the next starts
 716                         x1 = text_metrics_.cursorX(cur.top(), cur.boundary());
 717                 }
 718
 719                 if (!(cur < end) || draw_now) {
 720                         x2 = text_metrics_.cursorX(cur.top(), cur.boundary());
 721                         pi_.pain.fillRectangle(int(xo_ + min(x1, x2)), y1, abs(x2 - x1),
 722                                 y2 - y1, Color_selection);
 723
 724                         // reset x1, so it is set again next round (which will be on the
 725                         // right side of a boundary or at the selection end)
 726                         x1 = -1;
 727                 }
 728         }
 729 }
 730
 731
 732 } // namespace lyx