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