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);
 250         } else if (!some_sel) {
 251                 pi_.pain.text(int(x_), yo_, e.str, e.font, e.extra);
 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, e.extra);
 256         }
 257         x_ += e.full_width();
 258 }
 259
 260
 261 void RowPainter::paintChange(double orig_x, Font const & font,
 262                              Change const & change) const
 263 {
 264         if (!change.changed())
 265                 return;
 266         // Calculate 1/3 height of font
 267         FontMetrics const & fm = theFontMetrics(font);
 268         int const y_bar = change.deleted() ? yo_ - fm.maxAscent() / 3
 269                 : yo_ + 2 * solid_line_offset_ + solid_line_thickness_;
 270         pi_.pain.line(int(orig_x), y_bar, int(x_), y_bar,
 271                       change.color(), Painter::line_solid, solid_line_thickness_);
 272 }
 273
 274
 275 void RowPainter::paintChangeBar() const
 276 {
 277         pos_type const start = row_.pos();
 278         pos_type end = row_.endpos();
 279
 280         if (par_.size() == end) {
 281                 // this is the last row of the paragraph;
 282                 // thus, we must also consider the imaginary end-of-par character
 283                 end++;
 284         }
 285
 286         if (start == end || !par_.isChanged(start, end))
 287                 return;
 288
 289         int const height = text_metrics_.isLastRow(pit_, row_)
 290                 ? row_.ascent()
 291                 : row_.height();
 292
 293         pi_.pain.fillRectangle(5, yo_ - row_.ascent(), 3, height, Color_changebar);
 294 }
 295
 296
 297 void RowPainter::paintAppendix() const
 298 {
 299         // only draw the appendix frame once (for the main text)
 300         if (!par_.params().appendix() || !text_.isMainText())
 301                 return;
 302
 303         int y = yo_ - row_.ascent();
 304
 305         if (par_.params().startOfAppendix())
 306                 y += 2 * defaultRowHeight();
 307
 308         pi_.pain.line(1, y, 1, yo_ + row_.height(), Color_appendix);
 309         pi_.pain.line(width_ - 2, y, width_ - 2, yo_ + row_.height(), Color_appendix);
 310 }
 311
 312
 313 void RowPainter::paintDepthBar() const
 314 {
 315         depth_type const depth = par_.getDepth();
 316
 317         if (depth <= 0)
 318                 return;
 319
 320         depth_type prev_depth = 0;
 321         if (!text_metrics_.isFirstRow(pit_, row_)) {
 322                 pit_type pit2 = pit_;
 323                 if (row_.pos() == 0)
 324                         --pit2;
 325                 prev_depth = pars_[pit2].getDepth();
 326         }
 327
 328         depth_type next_depth = 0;
 329         if (!text_metrics_.isLastRow(pit_, row_)) {
 330                 pit_type pit2 = pit_;
 331                 if (row_.endpos() >= pars_[pit2].size())
 332                         ++pit2;
 333                 next_depth = pars_[pit2].getDepth();
 334         }
 335
 336         for (depth_type i = 1; i <= depth; ++i) {
 337                 int const w = nestMargin() / 5;
 338                 int x = int(xo_) + w * i;
 339                 // only consider the changebar space if we're drawing outermost text
 340                 if (text_.isMainText())
 341                         x += changebarMargin();
 342
 343                 int const starty = yo_ - row_.ascent();
 344                 int const h =  row_.height() - 1 - (i - next_depth - 1) * 3;
 345
 346                 pi_.pain.line(x, starty, x, starty + h, Color_depthbar);
 347
 348                 if (i > prev_depth)
 349                         pi_.pain.fillRectangle(x, starty, w, 2, Color_depthbar);
 350                 if (i > next_depth)
 351                         pi_.pain.fillRectangle(x, starty + h, w, 2, Color_depthbar);
 352         }
 353 }
 354
 355
 356 void RowPainter::paintAppendixStart(int y) const
 357 {
 358         FontInfo pb_font = sane_font;
 359         pb_font.setColor(Color_appendix);
 360         pb_font.decSize();
 361
 362         int w = 0;
 363         int a = 0;
 364         int d = 0;
 365
 366         docstring const label = _("Appendix");
 367         theFontMetrics(pb_font).rectText(label, w, a, d);
 368
 369         int const text_start = int(xo_ + (width_ - w) / 2);
 370         int const text_end = text_start + w;
 371
 372         pi_.pain.rectText(text_start, y + d, label, pb_font, Color_none, Color_none);
 373
 374         pi_.pain.line(int(xo_ + 1), y, text_start, y, Color_appendix);
 375         pi_.pain.line(text_end, y, int(xo_ + width_ - 2), y, Color_appendix);
 376 }
 377
 378
 379 void RowPainter::paintTooLargeMarks(bool const left, bool const right) const
 380 {
 381         if (left)
 382                 pi_.pain.line(dotted_line_thickness_, yo_ - row_.ascent(),
 383                                           dotted_line_thickness_, yo_ + row_.descent(),
 384                                           Color_scroll,
 385                                           Painter::line_onoffdash, dotted_line_thickness_);
 386         if (right) {
 387                 int const wwidth = pi_.base.bv->workWidth() - dotted_line_thickness_;
 388                 pi_.pain.line(wwidth, yo_ - row_.ascent(),
 389                                           wwidth, yo_ + row_.descent(),
 390                                           Color_scroll,
 391                                           Painter::line_onoffdash, dotted_line_thickness_);
 392         }
 393 }
 394
 395
 396 void RowPainter::paintFirst() const
 397 {
 398         Layout const & layout = par_.layout();
 399
 400         // start of appendix?
 401         if (par_.params().startOfAppendix())
 402             paintAppendixStart(yo_ - row_.ascent() + 2 * defaultRowHeight());
 403
 404         bool const is_first =
 405                 text_.isFirstInSequence(pit_) || !layout.isParagraphGroup();
 406         //lyxerr << "paintFirst: " << par_.id() << " is_seq: " << is_seq << endl;
 407
 408         if (layout.labelIsInline()
 409             && (layout.labeltype != LABEL_STATIC || is_first))
 410                 paintLabel();
 411         else if (is_first && layout.labelIsAbove())
 412                 paintTopLevelLabel();
 413 }
 414
 415
 416 void RowPainter::paintLabel() const
 417 {
 418         docstring const str = par_.labelString();
 419         if (str.empty())
 420                 return;
 421
 422         bool const is_rtl = text_.isRTL(par_);
 423         Layout const & layout = par_.layout();
 424         FontInfo const font = labelFont();
 425         FontMetrics const & fm = theFontMetrics(font);
 426         double x = x_;
 427
 428         if (is_rtl)
 429                 x = width_ - row_.right_margin + fm.width(layout.labelsep);
 430         else
 431                 x = x_ - fm.width(layout.labelsep) - fm.width(str);
 432
 433         pi_.pain.text(int(x), yo_, str, font);
 434 }
 435
 436
 437 void RowPainter::paintTopLevelLabel() const
 438 {
 439         BufferParams const & bparams = pi_.base.bv->buffer().params();
 440         bool const is_rtl = text_.isRTL(par_);
 441         ParagraphParameters const & pparams = par_.params();
 442         Layout const & layout = par_.layout();
 443         FontInfo const font = labelFont();
 444         docstring const str = par_.labelString();
 445         if (str.empty())
 446                 return;
 447
 448         double spacing_val = 1.0;
 449         if (!pparams.spacing().isDefault())
 450                 spacing_val = pparams.spacing().getValue();
 451         else
 452                 spacing_val = bparams.spacing().getValue();
 453
 454         FontMetrics const & fm = theFontMetrics(font);
 455
 456         int const labeladdon = int(fm.maxHeight()
 457                 * layout.spacing.getValue() * spacing_val);
 458
 459         int maxdesc =
 460                 int(fm.maxDescent() * layout.spacing.getValue() * spacing_val
 461                 + (layout.labelbottomsep * defaultRowHeight()));
 462
 463         double x = x_;
 464         if (layout.labeltype == LABEL_CENTERED) {
 465                 x = row_.left_margin + (width_ - row_.left_margin - row_.right_margin) / 2;
 466                 x -= fm.width(str) / 2;
 467         } else if (is_rtl) {
 468                 x = width_ - row_.right_margin - fm.width(str);
 469         }
 470         pi_.pain.text(int(x), yo_ - maxdesc - labeladdon, str, font);
 471 }
 472
 473
 474 /** Check if the current paragraph is the last paragraph in a
 475     proof environment */
 476 static int getEndLabel(pit_type p, Text const & text)
 477 {
 478         ParagraphList const & pars = text.paragraphs();
 479         pit_type pit = p;
 480         depth_type par_depth = pars[p].getDepth();
 481         while (pit != pit_type(pars.size())) {
 482                 Layout const & layout = pars[pit].layout();
 483                 int const endlabeltype = layout.endlabeltype;
 484
 485                 if (endlabeltype != END_LABEL_NO_LABEL) {
 486                         if (p + 1 == pit_type(pars.size()))
 487                                 return endlabeltype;
 488
 489                         depth_type const next_depth =
 490                                 pars[p + 1].getDepth();
 491                         if (par_depth > next_depth ||
 492                             (par_depth == next_depth && layout != pars[p + 1].layout()))
 493                                 return endlabeltype;
 494                         break;
 495                 }
 496                 if (par_depth == 0)
 497                         break;
 498                 pit = text.outerHook(pit);
 499                 if (pit != pit_type(pars.size()))
 500                         par_depth = pars[pit].getDepth();
 501         }
 502         return END_LABEL_NO_LABEL;
 503 }
 504
 505
 506 void RowPainter::paintLast()
 507 {
 508         bool const is_rtl = text_.isRTL(par_);
 509         int const endlabel = getEndLabel(pit_, text_);
 510
 511         // paint imaginary end-of-paragraph character
 512
 513         Change const & change = par_.lookupChange(par_.size());
 514         if (change.changed()) {
 515                 FontMetrics const & fm =
 516                         theFontMetrics(pi_.base.bv->buffer().params().getFont());
 517                 int const length = fm.maxAscent() / 2;
 518                 Color col = change.color();
 519
 520                 pi_.pain.line(int(x_) + 1, yo_ + 2, int(x_) + 1, yo_ + 2 - length, col,
 521                            Painter::line_solid, 3);
 522
 523                 if (change.deleted()) {
 524                         pi_.pain.line(int(x_) + 1 - length, yo_ + 2, int(x_) + 1 + length,
 525                                 yo_ + 2, col, Painter::line_solid, 3);
 526                 } else {
 527                         pi_.pain.line(int(x_) + 1 - length, yo_ + 2, int(x_) + 1,
 528                                 yo_ + 2, col, Painter::line_solid, 3);
 529                 }
 530         }
 531
 532         // draw an endlabel
 533
 534         switch (endlabel) {
 535         case END_LABEL_BOX:
 536         case END_LABEL_FILLED_BOX: {
 537                 FontInfo const font = labelFont();
 538                 FontMetrics const & fm = theFontMetrics(font);
 539                 int const size = int(0.75 * fm.maxAscent());
 540                 int const y = yo_ - size;
 541                 int const max_row_width = width_ - size - Inset::TEXT_TO_INSET_OFFSET;
 542                 int x = is_rtl ? nestMargin() + changebarMargin()
 543                         : max_row_width - row_.right_margin;
 544
 545                 // If needed, move the box a bit to avoid overlapping with text.
 546                 int const rem = max_row_width - row_.width();
 547                 if (rem <= 0)
 548                         x += is_rtl ? rem : - rem;
 549
 550                 if (endlabel == END_LABEL_BOX)
 551                         pi_.pain.rectangle(x, y, size, size, Color_eolmarker);
 552                 else
 553                         pi_.pain.fillRectangle(x, y, size, size, Color_eolmarker);
 554                 break;
 555         }
 556
 557         case END_LABEL_STATIC: {
 558                 FontInfo const font = labelFont();
 559                 FontMetrics const & fm = theFontMetrics(font);
 560                 docstring const & str = par_.layout().endlabelstring();
 561                 double const x = is_rtl ? x_ - fm.width(str) : x_;
 562                 pi_.pain.text(int(x), yo_, str, font);
 563                 break;
 564         }
 565
 566         case END_LABEL_NO_LABEL:
 567                 break;
 568         }
 569 }
 570
 571
 572 void RowPainter::paintOnlyInsets()
 573 {
 574         Row::const_iterator cit = row_.begin();
 575         Row::const_iterator const & end = row_.end();
 576         for ( ; cit != end ; ++cit) {
 577                 Row::Element const & e = *cit;
 578                 if (e.type == Row::INSET) {
 579                         // If outer row has changed, nested insets are repainted completely.
 580                         bool const nested_inset =
 581                                 (e.inset->asInsetMath() && !e.inset->asInsetMath()->asMacroTemplate())
 582                                 || e.inset->asInsetText() || e.inset->asInsetTabular();
 583                         if (!nested_inset) {
 584                                 x_ += e.full_width();
 585                                 continue;
 586                         }
 587                         paintInset(e);
 588                 } else
 589                         x_ += e.full_width();
 590         }
 591 }
 592
 593
 594 void RowPainter::paintText()
 595 {
 596         Row::const_iterator cit = row_.begin();
 597         Row::const_iterator const & end = row_.end();
 598         for ( ; cit != end ; ++cit) {
 599                 double const orig_x = x_;
 600                 Row::Element const & e = *cit;
 601                 int foreign_descent = 0;
 602
 603                 switch (e.type) {
 604                 case Row::STRING:
 605                 case Row::VIRTUAL:
 606                         paintStringAndSel(e);
 607
 608                         // Paint the spelling marks if enabled.
 609                         if (lyxrc.spellcheck_continuously && pi_.do_spellcheck && pi_.pain.isDrawingEnabled())
 610                                 paintMisspelledMark(orig_x, e);
 611                         break;
 612                 case Row::INSET: {
 613                         // If outer row has changed, nested insets are repainted completely.
 614                         paintInset(e);
 615                         foreign_descent = e.dim.descent();
 616                 }
 617                         break;
 618                 case Row::SPACE:
 619                         pi_.pain.textDecoration(e.font.fontInfo(), int(x_), yo_, int(e.full_width()));
 620                         x_ += e.full_width();
 621                 }
 622
 623                 // The line that indicates word in a different language
 624                 paintForeignMark(orig_x, e.font.language(), foreign_descent);
 625
 626                 // change tracking (not for insets that track their own changes)
 627                 if (e.type != Row::INSET || ! e.inset->canTrackChanges())
 628                         paintChange(orig_x, e.font, e.change);
 629         }
 630 }
 631
 632
 633 void RowPainter::paintSelection() const
 634 {
 635         if (!row_.selection())
 636                 return;
 637         Cursor const & curs = pi_.base.bv->cursor();
 638         DocIterator beg = curs.selectionBegin();
 639         beg.pit() = pit_;
 640         beg.pos() = row_.sel_beg;
 641
 642         DocIterator end = curs.selectionEnd();
 643         end.pit() = pit_;
 644         end.pos() = row_.sel_end;
 645
 646         bool const begin_boundary = beg.pos() >= row_.endpos();
 647         bool const end_boundary = row_.sel_end == row_.endpos();
 648
 649         DocIterator cur = beg;
 650         cur.boundary(begin_boundary);
 651         int x1 = text_metrics_.cursorX(beg.top(), begin_boundary);
 652         int x2 = text_metrics_.cursorX(end.top(), end_boundary);
 653         int const y1 = yo_ - row_.ascent();
 654         int const y2 = y1 + row_.height();
 655
 656         int const rm = text_.isMainText() ? pi_.base.bv->rightMargin() : 0;
 657         int const lm = text_.isMainText() ? pi_.base.bv->leftMargin() : 0;
 658
 659         // draw the margins
 660         if (row_.begin_margin_sel) {
 661                 if (text_.isRTL(beg.paragraph())) {
 662                         pi_.pain.fillRectangle(int(xo_ + x1), y1,
 663                                 text_metrics_.width() - rm - x1, y2 - y1, Color_selection);
 664                 } else {
 665                         pi_.pain.fillRectangle(int(xo_ + lm), y1, x1 - lm, y2 - y1,
 666                                 Color_selection);
 667                 }
 668         }
 669
 670         if (row_.end_margin_sel) {
 671                 if (text_.isRTL(beg.paragraph())) {
 672                         pi_.pain.fillRectangle(int(xo_ + lm), y1, x2 - lm, y2 - y1,
 673                                 Color_selection);
 674                 } else {
 675                         pi_.pain.fillRectangle(int(xo_ + x2), y1, text_metrics_.width() - rm - x2,
 676                                 y2 - y1, Color_selection);
 677                 }
 678         }
 679
 680         // if we are on a boundary from the beginning, it's probably
 681         // a RTL boundary and we jump to the other side directly as this
 682         // segement is 0-size and confuses the logic below
 683         if (cur.boundary())
 684                 cur.boundary(false);
 685
 686         // go through row and draw from RTL boundary to RTL boundary
 687         while (cur < end) {
 688                 bool draw_now = false;
 689
 690                 // simplified cursorForward code below which does not
 691                 // descend into insets and which does not go into the
 692                 // next line. Compare the logic with the original cursorForward
 693
 694                 // if left of boundary -> just jump to right side, but
 695                 // for RTL boundaries don't, because: abc|DDEEFFghi -> abcDDEEF|Fghi
 696                 if (cur.boundary()) {
 697                         cur.boundary(false);
 698                 }       else if (text_metrics_.isRTLBoundary(cur.pit(), cur.pos() + 1)) {
 699                         // in front of RTL boundary -> Stay on this side of the boundary
 700                         // because:  ab|cDDEEFFghi -> abc|DDEEFFghi
 701                         ++cur.pos();
 702                         cur.boundary(true);
 703                         draw_now = true;
 704                 } else {
 705                         // move right
 706                         ++cur.pos();
 707
 708                         // line end?
 709                         if (cur.pos() == row_.endpos())
 710                                 cur.boundary(true);
 711                 }
 712
 713                 if (x1 == -1) {
 714                         // the previous segment was just drawn, now the next starts
 715                         x1 = text_metrics_.cursorX(cur.top(), cur.boundary());
 716                 }
 717
 718                 if (!(cur < end) || draw_now) {
 719                         x2 = text_metrics_.cursorX(cur.top(), cur.boundary());
 720                         pi_.pain.fillRectangle(int(xo_ + min(x1, x2)), y1, abs(x2 - x1),
 721                                 y2 - y1, Color_selection);
 722
 723                         // reset x1, so it is set again next round (which will be on the
 724                         // right side of a boundary or at the selection end)
 725                         x1 = -1;
 726                 }
 727         }
 728 }
 729
 730
 731 } // namespace lyx