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