src/rowpainter.C

   1 /**
   2  * \file rowpainter.C
   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
  14 #include "rowpainter.h"
  15
  16 #include "buffer.h"
  17 #include "coordcache.h"
  18 #include "cursor.h"
  19 #include "debug.h"
  20 #include "bufferparams.h"
  21 #include "BufferView.h"
  22 #include "encoding.h"
  23 #include "gettext.h"
  24 #include "language.h"
  25 #include "LColor.h"
  26 #include "lyxrc.h"
  27 #include "lyxrow.h"
  28 #include "lyxrow_funcs.h"
  29 #include "metricsinfo.h"
  30 #include "paragraph.h"
  31 #include "paragraph_funcs.h"
  32 #include "ParagraphParameters.h"
  33 #include "vspace.h"
  34
  35 #include "frontends/font_metrics.h"
  36 #include "frontends/nullpainter.h"
  37 #include "frontends/LyXView.h"
  38 #include "frontends/WorkArea.h"
  39 #include "frontends/Painter.h"
  40
  41 #include "insets/insettext.h"
  42
  43 #include "support/textutils.h"
  44
  45 #include <boost/crc.hpp>
  46
  47 using lyx::frontend::Painter;
  48 using lyx::frontend::NullPainter;
  49 using lyx::char_type;
  50 using lyx::pos_type;
  51 using lyx::pit_type;
  52
  53 using std::endl;
  54 using std::max;
  55 using std::min;
  56 using std::string;
  57
  58
  59 namespace {
  60
  61 /// Flag: do a full redraw of inside text of inset
  62 /// Working variable indicating a full screen refresh
  63 bool refreshInside;
  64
  65 /**
  66  * A class used for painting an individual row of text.
  67  */
  68 class RowPainter {
  69 public:
  70         /// initialise and run painter
  71         RowPainter(PainterInfo & pi, LyXText const & text,
  72                 pit_type pit, Row const & row, int x, int y);
  73
  74         // paint various parts
  75         void paintAppendix();
  76         void paintDepthBar();
  77         void paintChangeBar();
  78         void paintFirst();
  79         void paintLast();
  80         void paintText();
  81
  82 private:
  83         void paintForeignMark(double orig_x, LyXFont const & font, int desc = 0);
  84         void paintHebrewComposeChar(lyx::pos_type & vpos, LyXFont const & font);
  85         void paintArabicComposeChar(lyx::pos_type & vpos, LyXFont const & font);
  86         void paintChars(lyx::pos_type & vpos, LyXFont font,
  87                         bool hebrew, bool arabic);
  88         int paintAppendixStart(int y);
  89         void paintFromPos(lyx::pos_type & vpos);
  90         void paintInset(lyx::pos_type const pos, LyXFont const & font);
  91
  92         /// return left margin
  93         int leftMargin() const;
  94
  95         /// return the label font for this row
  96         LyXFont const getLabelFont() const;
  97
  98         /// bufferview to paint on
  99         BufferView const & bv_;
 100
 101         /// Painter to use
 102         Painter & pain_;
 103
 104         /// LyXText for the row
 105         LyXText const & text_;
 106         ParagraphList const & pars_;
 107
 108         /// The row to paint
 109         Row const & row_;
 110
 111         /// Row's paragraph
 112         pit_type const pit_;
 113         Paragraph const & par_;
 114
 115         /// is row erased? (change tracking)
 116         bool erased_;
 117
 118         // Looks ugly - is
 119         double const xo_;
 120         int const yo_;    // current baseline
 121         double x_;
 122         int width_;
 123         double separator_;
 124         double hfill_;
 125         double label_hfill_;
 126 };
 127
 128
 129 RowPainter::RowPainter(PainterInfo & pi,
 130         LyXText const & text, pit_type pit, Row const & row, int x, int y)
 131         : bv_(*pi.base.bv), pain_(pi.pain), text_(text), pars_(text.paragraphs()),
 132           row_(row), pit_(pit), par_(text.paragraphs()[pit]),
 133           erased_(pi.erased_),
 134           xo_(x), yo_(y), width_(text_.width())
 135 {
 136         RowMetrics m = text_.computeRowMetrics(pit, row_);
 137         x_ = m.x + xo_;
 138
 139         //lyxerr << "RowPainter: x: " << x_ << " xo: " << xo_ << " yo: " << yo_ << endl;
 140         //row_.dump();
 141
 142         separator_ = m.separator;
 143         hfill_ = m.hfill;
 144         label_hfill_ = m.label_hfill;
 145
 146         BOOST_ASSERT(pit >= 0);
 147         BOOST_ASSERT(pit < int(text.paragraphs().size()));
 148 }
 149
 150
 151 LyXFont const RowPainter::getLabelFont() const
 152 {
 153         return text_.getLabelFont(par_);
 154 }
 155
 156
 157 int RowPainter::leftMargin() const
 158 {
 159         return text_.leftMargin(pit_, row_.pos());
 160 }
 161
 162
 163 void RowPainter::paintInset(pos_type const pos, LyXFont const & font)
 164 {
 165         InsetBase const * inset = par_.getInset(pos);
 166         BOOST_ASSERT(inset);
 167         PainterInfo pi(const_cast<BufferView *>(&bv_), pain_);
 168         // FIXME: We should always use font, see documentation of
 169         // noFontChange() in insetbase.h.
 170         pi.base.font = inset->noFontChange() ?
 171                 bv_.buffer()->params().getFont() :
 172                 font;
 173         pi.ltr_pos = (text_.bidi.level(pos) % 2 == 0);
 174         pi.erased_ = erased_ || isDeletedText(par_, pos);
 175         theCoords.insets().add(inset, int(x_), yo_);
 176         InsetText const * const in = inset->asTextInset();
 177         // non-wide insets are painted completely. Recursive
 178         bool tmp = refreshInside;
 179         if (!in || !in->Wide()) {
 180                 refreshInside = true;
 181                 lyxerr[Debug::PAINTING] << endl << "Paint inset fully" << endl;
 182         }
 183         if (refreshInside)
 184                 inset->drawSelection(pi, int(x_), yo_);
 185         inset->draw(pi, int(x_), yo_);
 186         refreshInside = tmp;
 187         x_ += inset->width();
 188 }
 189
 190
 191 void RowPainter::paintHebrewComposeChar(pos_type & vpos, LyXFont const & font)
 192 {
 193         pos_type pos = text_.bidi.vis2log(vpos);
 194
 195         string str;
 196
 197         // first char
 198         char_type c = par_.getChar(pos);
 199         str += c;
 200         ++vpos;
 201
 202         int const width = font_metrics::width(c, font);
 203         int dx = 0;
 204
 205         for (pos_type i = pos - 1; i >= 0; --i) {
 206                 c = par_.getChar(i);
 207                 if (!Encodings::isComposeChar_hebrew(c)) {
 208                         if (isPrintableNonspace(c)) {
 209                                 int const width2 =
 210                                         text_.singleWidth(par_, i, c, text_.getFont(par_, i));
 211                                 // dalet / resh
 212                                 dx = (c == 'ø' || c == 'ã')
 213                                         ? width2 - width
 214                                         : (width2 - width) / 2;
 215                         }
 216                         break;
 217                 }
 218         }
 219
 220         // Draw nikud
 221         pain_.text(int(x_) + dx, yo_, str, font);
 222 }
 223
 224
 225 void RowPainter::paintArabicComposeChar(pos_type & vpos, LyXFont const & font)
 226 {
 227         pos_type pos = text_.bidi.vis2log(vpos);
 228         string str;
 229
 230         // first char
 231         char_type c = par_.getChar(pos);
 232         c = par_.transformChar(c, pos);
 233         str += c;
 234         ++vpos;
 235
 236         int const width = font_metrics::width(c, font);
 237         int dx = 0;
 238
 239         for (pos_type i = pos - 1; i >= 0; --i) {
 240                 c = par_.getChar(i);
 241                 if (!Encodings::isComposeChar_arabic(c)) {
 242                         if (isPrintableNonspace(c)) {
 243                                 int const width2 =
 244                                         text_.singleWidth(par_, i, c, text_.getFont(par_, i));
 245                                 dx = (width2 - width) / 2;
 246                         }
 247                         break;
 248                 }
 249         }
 250         // Draw nikud
 251         pain_.text(int(x_) + dx, yo_, str, font);
 252 }
 253
 254
 255 void RowPainter::paintChars(pos_type & vpos, LyXFont font,
 256                             bool hebrew, bool arabic)
 257 {
 258         pos_type pos = text_.bidi.vis2log(vpos);
 259         pos_type const end = row_.endpos();
 260         FontSpan const font_span = par_.fontSpan(pos);
 261         Change::Type const prev_change = par_.lookupChange(pos).type;
 262
 263         // first character
 264         string str;
 265         str += par_.getChar(pos);
 266         if (arabic) {
 267                 unsigned char c = str[0];
 268                 str[0] = par_.transformChar(c, pos);
 269         }
 270
 271         // collect as much similar chars as we can
 272         for (++vpos ; vpos < end ; ++vpos) {
 273                 pos = text_.bidi.vis2log(vpos);
 274                 if (pos < font_span.first || pos > font_span.last)
 275                         break;
 276
 277                 if (prev_change != par_.lookupChange(pos))
 278                         break;
 279
 280                 char_type c = par_.getChar(pos);
 281
 282                 if (!isPrintableNonspace(c))
 283                         break;
 284
 285                 if (arabic && Encodings::isComposeChar_arabic(c))
 286                         break;
 287
 288                 if (hebrew && Encodings::isComposeChar_hebrew(c))
 289                         break;
 290
 291                 if (arabic)
 292                         c = par_.transformChar(c, pos);
 293
 294                 str += c;
 295         }
 296
 297         if (prev_change == Change::DELETED)
 298                 font.setColor(LColor::strikeout);
 299         else if (prev_change == Change::INSERTED)
 300                 font.setColor(LColor::newtext);
 301
 302         // Draw text and set the new x position
 303         //lyxerr << "paint row: yo_ " << yo_ << "\n";
 304         pain_.text(int(x_), yo_, str, font);
 305         x_ += font_metrics::width(str, font);
 306 }
 307
 308
 309 void RowPainter::paintForeignMark(double orig_x, LyXFont const & font, int desc)
 310 {
 311         if (!lyxrc.mark_foreign_language)
 312                 return;
 313         if (font.language() == latex_language)
 314                 return;
 315         if (font.language() == bv_.buffer()->params().language)
 316                 return;
 317
 318         int const y = yo_ + 1 + desc;
 319         pain_.line(int(orig_x), y, int(x_), y, LColor::language);
 320 }
 321
 322
 323 void RowPainter::paintFromPos(pos_type & vpos)
 324 {
 325         pos_type const pos = text_.bidi.vis2log(vpos);
 326         LyXFont orig_font = text_.getFont(par_, pos);
 327
 328         double const orig_x = x_;
 329
 330         if (par_.isInset(pos)) {
 331                 paintInset(pos, orig_font);
 332                 ++vpos;
 333                 paintForeignMark(orig_x, orig_font,
 334                         par_.getInset(pos)->descent());
 335                 return;
 336         }
 337
 338         // usual characters, no insets
 339         char_type const c = par_.getChar(pos);
 340
 341         // special case languages
 342         std::string const & lang = orig_font.language()->lang();
 343         bool const hebrew = lang == "hebrew";
 344         bool const arabic = lang == "arabic" &&
 345                 (lyxrc.font_norm_type == LyXRC::ISO_8859_6_8 ||
 346                 lyxrc.font_norm_type == LyXRC::ISO_10646_1);
 347
 348         // draw as many chars as we can
 349         if ((!hebrew && !arabic)
 350                 || (hebrew && !Encodings::isComposeChar_hebrew(c))
 351                 || (arabic && !Encodings::isComposeChar_arabic(c))) {
 352                 paintChars(vpos, orig_font, hebrew, arabic);
 353         } else if (hebrew) {
 354                 paintHebrewComposeChar(vpos, orig_font);
 355         } else if (arabic) {
 356                 paintArabicComposeChar(vpos, orig_font);
 357         }
 358
 359         paintForeignMark(orig_x, orig_font);
 360 }
 361
 362
 363 void RowPainter::paintChangeBar()
 364 {
 365         pos_type const start = row_.pos();
 366         pos_type const end = row_.endpos();
 367
 368         if (start == end || !par_.isChanged(start, end))
 369                 return;
 370
 371         int const height = text_.isLastRow(pit_, row_)
 372                 ? row_.ascent()
 373                 : row_.height();
 374
 375         pain_.fillRectangle(4, yo_ - row_.ascent(), 5, height, LColor::changebar);
 376 }
 377
 378
 379 void RowPainter::paintAppendix()
 380 {
 381         if (!par_.params().appendix())
 382                 return;
 383
 384         int y = yo_ - row_.ascent();
 385
 386         if (par_.params().startOfAppendix())
 387                 y += 2 * defaultRowHeight();
 388
 389         pain_.line(1, y, 1, yo_ + row_.height(), LColor::appendix);
 390         pain_.line(width_ - 2, y, width_ - 2, yo_ + row_.height(), LColor::appendix);
 391 }
 392
 393
 394 void RowPainter::paintDepthBar()
 395 {
 396         Paragraph::depth_type const depth = par_.getDepth();
 397
 398         if (depth <= 0)
 399                 return;
 400
 401         Paragraph::depth_type prev_depth = 0;
 402         if (!text_.isFirstRow(pit_, row_)) {
 403                 pit_type pit2 = pit_;
 404                 if (row_.pos() == 0)
 405                         --pit2;
 406                 prev_depth = pars_[pit2].getDepth();
 407         }
 408
 409         Paragraph::depth_type next_depth = 0;
 410         if (!text_.isLastRow(pit_, row_)) {
 411                 pit_type pit2 = pit_;
 412                 if (row_.endpos() >= pars_[pit2].size())
 413                         ++pit2;
 414                 next_depth = pars_[pit2].getDepth();
 415         }
 416
 417         for (Paragraph::depth_type i = 1; i <= depth; ++i) {
 418                 int const w = nestMargin() / 5;
 419                 int x = int(xo_) + w * i;
 420                 // only consider the changebar space if we're drawing outermost text
 421                 if (text_.isMainText())
 422                         x += changebarMargin();
 423
 424                 int const starty = yo_ - row_.ascent();
 425                 int const h =  row_.height() - 1 - (i - next_depth - 1) * 3;
 426
 427                 pain_.line(x, starty, x, starty + h, LColor::depthbar);
 428
 429                 if (i > prev_depth)
 430                         pain_.fillRectangle(x, starty, w, 2, LColor::depthbar);
 431                 if (i > next_depth)
 432                         pain_.fillRectangle(x, starty + h, w, 2, LColor::depthbar);
 433         }
 434 }
 435
 436
 437 int RowPainter::paintAppendixStart(int y)
 438 {
 439         LyXFont pb_font;
 440         pb_font.setColor(LColor::appendix);
 441         pb_font.decSize();
 442
 443         string const label = _("Appendix");
 444         int w = 0;
 445         int a = 0;
 446         int d = 0;
 447         font_metrics::rectText(label, pb_font, w, a, d);
 448
 449         int const text_start = int(xo_ + (width_ - w) / 2);
 450         int const text_end = text_start + w;
 451
 452         pain_.rectText(text_start, y + d, label, pb_font, LColor::none, LColor::none);
 453
 454         pain_.line(int(xo_ + 1), y, text_start, y, LColor::appendix);
 455         pain_.line(text_end, y, int(xo_ + width_ - 2), y, LColor::appendix);
 456
 457         return 3 * defaultRowHeight();
 458 }
 459
 460
 461 void RowPainter::paintFirst()
 462 {
 463         ParagraphParameters const & parparams = par_.params();
 464
 465         int y_top = 0;
 466
 467         // start of appendix?
 468         if (parparams.startOfAppendix())
 469                 y_top += paintAppendixStart(yo_ - row_.ascent() + 2 * defaultRowHeight());
 470
 471         Buffer const & buffer = *bv_.buffer();
 472
 473         LyXLayout_ptr const & layout = par_.layout();
 474
 475         if (buffer.params().paragraph_separation == BufferParams::PARSEP_SKIP) {
 476                 if (pit_ != 0) {
 477                         if (layout->latextype == LATEX_PARAGRAPH
 478                                 && !par_.getDepth()) {
 479                                 y_top += buffer.params().getDefSkip().inPixels(bv_);
 480                         } else {
 481                                 LyXLayout_ptr const & playout = pars_[pit_ - 1].layout();
 482                                 if (playout->latextype == LATEX_PARAGRAPH
 483                                         && !pars_[pit_ - 1].getDepth()) {
 484                                         // is it right to use defskip here, too? (AS)
 485                                         y_top += buffer.params().getDefSkip().inPixels(bv_);
 486                                 }
 487                         }
 488                 }
 489         }
 490
 491         bool const is_rtl = text_.isRTL(par_);
 492         bool const is_seq = isFirstInSequence(pit_, text_.paragraphs());
 493         //lyxerr << "paintFirst: " << par_.id() << " is_seq: " << is_seq << std::endl;
 494
 495         // should we print a label?
 496         if (layout->labeltype >= LABEL_STATIC
 497             && (layout->labeltype != LABEL_STATIC
 498                       || layout->latextype != LATEX_ENVIRONMENT
 499                       || is_seq)) {
 500
 501                 LyXFont const font = getLabelFont();
 502                 string const str = par_.getLabelstring();
 503                 if (!str.empty()) {
 504                         double x = x_;
 505
 506                         // this is special code for the chapter layout. This is
 507                         // printed in an extra row and has a pagebreak at
 508                         // the top.
 509                         if (layout->counter == "chapter") {
 510                                 double spacing_val = 1.0;
 511                                 if (!parparams.spacing().isDefault()) {
 512                                         spacing_val = parparams.spacing().getValue();
 513                                 } else {
 514                                         spacing_val = buffer.params().spacing().getValue();
 515                                 }
 516
 517                                 int const labeladdon = int(font_metrics::maxHeight(font) * layout->spacing.getValue() * spacing_val);
 518
 519                                 int const maxdesc = int(font_metrics::maxDescent(font) * layout->spacing.getValue() * spacing_val)
 520                                         + int(layout->parsep) * defaultRowHeight();
 521
 522                                 if (is_rtl) {
 523                                         x = width_ - leftMargin() -
 524                                                 font_metrics::width(str, font);
 525                                 }
 526
 527                                 pain_.text(int(x), yo_ - maxdesc - labeladdon, str, font);
 528                         } else {
 529                                 if (is_rtl) {
 530                                         x = width_ - leftMargin()
 531                                                 + font_metrics::width(layout->labelsep, font);
 532                                 } else {
 533                                         x = x_ - font_metrics::width(layout->labelsep, font)
 534                                                 - font_metrics::width(str, font);
 535                                 }
 536
 537                                 pain_.text(int(x), yo_, str, font);
 538                         }
 539                 }
 540
 541         // the labels at the top of an environment.
 542         // More or less for bibliography
 543         } else if (is_seq &&
 544                 (layout->labeltype == LABEL_TOP_ENVIRONMENT ||
 545                 layout->labeltype == LABEL_BIBLIO ||
 546                 layout->labeltype == LABEL_CENTERED_TOP_ENVIRONMENT)) {
 547                 LyXFont font = getLabelFont();
 548                 if (!par_.getLabelstring().empty()) {
 549                         string const str = par_.getLabelstring();
 550                         double spacing_val = 1.0;
 551                         if (!parparams.spacing().isDefault())
 552                                 spacing_val = parparams.spacing().getValue();
 553                         else
 554                                 spacing_val = buffer.params().spacing().getValue();
 555
 556                         int const labeladdon = int(font_metrics::maxHeight(font) * layout->spacing.getValue() * spacing_val);
 557
 558                         int maxdesc =
 559                                 int(font_metrics::maxDescent(font) * layout->spacing.getValue() * spacing_val
 560                                 + (layout->labelbottomsep * defaultRowHeight()));
 561
 562                         double x = x_;
 563                         if (layout->labeltype == LABEL_CENTERED_TOP_ENVIRONMENT) {
 564                                 if (is_rtl)
 565                                         x = leftMargin();
 566                                 x += (width_ - text_.rightMargin(par_) - leftMargin()) / 2;
 567                                 x -= font_metrics::width(str, font) / 2;
 568                         } else if (is_rtl) {
 569                                 x = width_ - leftMargin() -
 570                                         font_metrics::width(str, font);
 571                         }
 572                         pain_.text(int(x), yo_ - maxdesc - labeladdon, str, font);
 573                 }
 574         }
 575 }
 576
 577
 578 void RowPainter::paintLast()
 579 {
 580         bool const is_rtl = text_.isRTL(par_);
 581         int const endlabel = getEndLabel(pit_, text_.paragraphs());
 582
 583         // draw an endlabel
 584         switch (endlabel) {
 585         case END_LABEL_BOX:
 586         case END_LABEL_FILLED_BOX: {
 587                 LyXFont const font = getLabelFont();
 588                 int const size = int(0.75 * font_metrics::maxAscent(font));
 589                 int const y = yo_ - size;
 590                 int x = is_rtl ? nestMargin() + changebarMargin() : width_ - size;
 591
 592                 if (width_ - int(row_.width()) <= size)
 593                         x += (size - width_ + row_.width() + 1) * (is_rtl ? -1 : 1);
 594
 595                 if (endlabel == END_LABEL_BOX)
 596                         pain_.rectangle(x, y, size, size, LColor::eolmarker);
 597                 else
 598                         pain_.fillRectangle(x, y, size, size, LColor::eolmarker);
 599                 break;
 600         }
 601
 602         case END_LABEL_STATIC: {
 603                 LyXFont font = getLabelFont();
 604                 string const & str = par_.layout()->endlabelstring();
 605                 double const x = is_rtl ?
 606                         x_ - font_metrics::width(str, font)
 607                         : - text_.rightMargin(par_) - row_.width();
 608                 pain_.text(int(x), yo_, str, font);
 609                 break;
 610         }
 611
 612         case END_LABEL_NO_LABEL:
 613                 break;
 614         }
 615 }
 616
 617
 618 void RowPainter::paintText()
 619 {
 620         pos_type const end = row_.endpos();
 621         pos_type body_pos = par_.beginOfBody();
 622         if (body_pos > 0 &&
 623                 (body_pos > end || !par_.isLineSeparator(body_pos - 1))) {
 624                 body_pos = 0;
 625         }
 626
 627         LyXLayout_ptr const & layout = par_.layout();
 628
 629         bool running_strikeout = false;
 630         bool is_struckout = false;
 631         int last_strikeout_x = 0;
 632
 633         // Use font span to speed things up, see below
 634         FontSpan font_span;
 635         LyXFont font;
 636
 637         for (pos_type vpos = row_.pos(); vpos < end; ) {
 638                 if (x_ > bv_.workWidth())
 639                         break;
 640
 641                 pos_type const pos = text_.bidi.vis2log(vpos);
 642
 643                 if (pos >= par_.size()) {
 644                         ++vpos;
 645                         continue;
 646                 }
 647
 648                 // Use font span to speed things up, see above
 649                 if (vpos < font_span.first || vpos > font_span.last) {
 650                         font_span = par_.fontSpan(vpos);
 651                         font = text_.getFont(par_, vpos);
 652                 }
 653
 654                 const int width_pos =
 655                         text_.singleWidth(par_, pos, par_.getChar(pos), font);
 656
 657                 if (x_ + width_pos < 0) {
 658                         x_ += width_pos;
 659                         ++vpos;
 660                         continue;
 661                 }
 662
 663                 is_struckout = isDeletedText(par_, pos);
 664
 665                 if (is_struckout && !running_strikeout) {
 666                         running_strikeout = true;
 667                         last_strikeout_x = int(x_);
 668                 }
 669
 670                 bool const highly_editable_inset = par_.isInset(pos)
 671                         && isHighlyEditableInset(par_.getInset(pos));
 672
 673                 // If we reach the end of a struck out range, paint it.
 674                 // We also don't paint across things like tables
 675                 if (running_strikeout && (highly_editable_inset || !is_struckout)) {
 676                         // Calculate 1/3 height of the buffer's default font
 677                         int const middle =
 678                                 yo_ -
 679                                 font_metrics::maxAscent(bv_.buffer()->params().getFont()) / 3;
 680                         pain_.line(last_strikeout_x, middle, int(x_), middle,
 681                                 LColor::strikeout, Painter::line_solid, Painter::line_thin);
 682                         running_strikeout = false;
 683                 }
 684
 685                 if (body_pos > 0 && pos == body_pos - 1) {
 686                         int const lwidth = font_metrics::width(layout->labelsep,
 687                                 getLabelFont());
 688
 689                         x_ += label_hfill_ + lwidth - width_pos;
 690                 }
 691
 692                 if (par_.isHfill(pos)) {
 693                         x_ += 1;
 694
 695                         int const y0 = yo_;
 696                         int const y1 = y0 - defaultRowHeight() / 2;
 697
 698                         pain_.line(int(x_), y1, int(x_), y0, LColor::added_space);
 699
 700                         if (hfillExpansion(par_, row_, pos)) {
 701                                 int const y2 = (y0 + y1) / 2;
 702
 703                                 if (pos >= body_pos) {
 704                                         pain_.line(int(x_), y2, int(x_ + hfill_), y2,
 705                                                   LColor::added_space,
 706                                                   Painter::line_onoffdash);
 707                                         x_ += hfill_;
 708                                 } else {
 709                                         pain_.line(int(x_), y2, int(x_ + label_hfill_), y2,
 710                                                   LColor::added_space,
 711                                                   Painter::line_onoffdash);
 712                                         x_ += label_hfill_;
 713                                 }
 714                                 pain_.line(int(x_), y1, int(x_), y0, LColor::added_space);
 715                         }
 716                         x_ += 2;
 717                         ++vpos;
 718                 } else if (par_.isSeparator(pos)) {
 719                         x_ += width_pos;
 720                         if (pos >= body_pos)
 721                                 x_ += separator_;
 722                         ++vpos;
 723                 } else {
 724                         paintFromPos(vpos);
 725                 }
 726         }
 727
 728         // if we reach the end of a struck out range, paint it
 729         if (running_strikeout) {
 730                 // calculate 1/3 height of the buffer's default font
 731                 int const middle =
 732                         yo_ -
 733                         font_metrics::maxAscent(bv_.buffer()->params().getFont()) / 3;
 734                 pain_.line(last_strikeout_x, middle, int(x_), middle,
 735                         LColor::strikeout, Painter::line_solid, Painter::line_thin);
 736                 running_strikeout = false;
 737         }
 738 }
 739
 740
 741 lyx::size_type calculateRowSignature(Row const & row, Paragraph const & par,
 742         int x, int y)
 743 {
 744         boost::crc_32_type crc;
 745         for (lyx::pos_type i = row.pos(); i < row.endpos(); ++i) {
 746                 const unsigned char b[] = { par.getChar(i) };
 747                 crc.process_bytes(b, 1);
 748         }
 749         const unsigned char b[] = { x, y, row.width() };
 750         crc.process_bytes(b, 3);
 751         return crc.checksum();
 752 }
 753
 754
 755 bool CursorOnRow(PainterInfo & pi, pit_type const pit,
 756         RowList::const_iterator rit, LyXText const & text)
 757 {
 758         // Is there a cursor on this row (or inside inset on row)
 759         LCursor & cur = pi.base.bv->cursor();
 760         for (lyx::size_type d = 0; d < cur.depth(); d++) {
 761                 CursorSlice const & sl = cur[d];
 762                 if (sl.text() == &text
 763                     && sl.pit() == pit
 764                     && sl.pos() >= rit->pos()
 765                     && sl.pos() <= rit->endpos())
 766                         return true;
 767         }
 768         return false;
 769 }
 770
 771
 772 bool innerCursorOnRow(PainterInfo & pi, pit_type pit,
 773         RowList::const_iterator rit, LyXText const & text)
 774 {
 775         // Is there a cursor inside an inset on this row, and is this inset
 776         // the only "character" on this row
 777         LCursor & cur = pi.base.bv->cursor();
 778         if (rit->pos() + 1 != rit->endpos())
 779                 return false;
 780         for (lyx::size_type d = 0; d < cur.depth(); d++) {
 781                 CursorSlice const & sl = cur[d];
 782                 if (sl.text() == &text
 783                     && sl.pit() == pit
 784                     && sl.pos() == rit->pos())
 785                         return d < cur.depth() - 1;
 786         }
 787         return false;
 788 }
 789
 790
 791 void paintPar
 792         (PainterInfo & pi, LyXText const & text, pit_type pit, int x, int y,
 793          bool repaintAll)
 794 {
 795 //      lyxerr << "  paintPar: pit: " << pit << " at y: " << y << endl;
 796         static NullPainter nop;
 797         static PainterInfo nullpi(pi.base.bv, nop);
 798         int const ww = pi.base.bv->workHeight();
 799
 800         Paragraph const & par = text.paragraphs()[pit];
 801
 802         RowList::const_iterator const rb = par.rows().begin();
 803         RowList::const_iterator const re = par.rows().end();
 804         theCoords.parPos()[&text][pit] = Point(x, y);
 805
 806         y -= rb->ascent();
 807         lyx::size_type rowno(0);
 808         for (RowList::const_iterator rit = rb; rit != re; ++rit, ++rowno) {
 809                 y += rit->ascent();
 810                 // Allow setting of refreshInside for nested insets in
 811                 // this row only
 812                 bool tmp = refreshInside;
 813
 814                 // Row signature; has row changed since last paint?
 815                 lyx::size_type const row_sig = calculateRowSignature(*rit, par, x, y);
 816                 bool row_has_changed = par.rowSignature()[rowno] != row_sig;
 817
 818                 bool cursor_on_row = CursorOnRow(pi, pit, rit, text);
 819                 bool in_inset_alone_on_row = innerCursorOnRow(pi, pit, rit,
 820                         text);
 821
 822                 // If this is the only object on the row, we can make it wide
 823                 for (pos_type i = rit->pos() ; i != rit->endpos(); ++i) {
 824                         InsetBase const * const in = par.getInset(i);
 825                         if (in) {
 826                                 InsetText const * const t = in->asTextInset();
 827                                 if (t)
 828                                         t->Wide() = in_inset_alone_on_row;
 829                         }
 830                 }
 831
 832                 // If selection is on, the current row signature differs
 833                 // from cache, or cursor is inside an inset _on this row_,
 834                 // then paint the row
 835                 if (repaintAll || row_has_changed || cursor_on_row) {
 836                         // Add to row signature cache
 837                         par.rowSignature()[rowno] = row_sig;
 838
 839                         bool const inside = (y + rit->descent() >= 0
 840                                        && y - rit->ascent() < ww);
 841                         RowPainter rp(inside ? pi : nullpi, text, pit, *rit, x, y);
 842                         // Clear background of this row
 843                         // (if paragraph background was not cleared)
 844                         if (!repaintAll &&
 845                             (!in_inset_alone_on_row || row_has_changed)) {
 846                                 pi.pain.fillRectangle(x, y - rit->ascent(),
 847                                     text.maxwidth_, rit->height(),
 848                                     text.backgroundColor());
 849                                 // If outer row has changed, force nested
 850                                 // insets to repaint completely
 851                                 if (row_has_changed)
 852                                         refreshInside = true;
 853                         }
 854
 855                         // Instrumentation for testing row cache (see also
 856                         // 12 lines lower):
 857                         if (text.isMainText())
 858                                 lyxerr[Debug::PAINTING] << "#";
 859                         else
 860                                 lyxerr[Debug::PAINTING] << "[" <<
 861                                     repaintAll << row_has_changed <<
 862                                     cursor_on_row << "]";
 863                         rp.paintAppendix();
 864                         rp.paintDepthBar();
 865                         rp.paintChangeBar();
 866                         if (rit == rb)
 867                                 rp.paintFirst();
 868                         if (rit + 1 == re)
 869                                 rp.paintLast();
 870                         rp.paintText();
 871                 }
 872                 y += rit->descent();
 873                 // Restore, see above
 874                 refreshInside = tmp;
 875         }
 876         lyxerr[Debug::PAINTING] << "." << endl;
 877 }
 878
 879 } // namespace anon
 880
 881
 882 void paintText(BufferView const & bv, ViewMetricsInfo const & vi)
 883 {
 884         Painter & pain = bv.owner()->workArea()->getPainter();
 885         LyXText * const text = bv.text();
 886         bool const select = bv.cursor().selection();
 887
 888         PainterInfo pi(const_cast<BufferView *>(&bv), pain);
 889         // Should the whole screen, including insets, be refreshed?
 890         bool repaintAll = select || !vi.singlepar;
 891
 892         if (repaintAll) {
 893                 // Clear background (if not delegated to rows)
 894                 pain.fillRectangle(0, vi.y1, bv.workWidth(), vi.y2 - vi.y1,
 895                         text->backgroundColor());
 896         }
 897         if (select) {
 898                 text->drawSelection(pi, 0, 0);
 899         }
 900
 901         int yy = vi.y1;
 902         // draw contents
 903         for (pit_type pit = vi.p1; pit <= vi.p2; ++pit) {
 904                 refreshInside = repaintAll;
 905                 Paragraph const & par = text->getPar(pit);
 906                 yy += par.ascent();
 907                 paintPar(pi, *bv.text(), pit, 0, yy, repaintAll);
 908                 yy += par.descent();
 909         }
 910
 911         // Cache one paragraph above and one below
 912         // Note MV: this cannot be suppressed even for singlepar.
 913         // Try viewing the User Guide Mobius figure
 914
 915         if (vi.p1 > 0) {
 916                 text->redoParagraph(vi.p1 - 1);
 917                 theCoords.parPos()[bv.text()][vi.p1 - 1] =
 918                         Point(0, vi.y1 - text->getPar(vi.p1 - 1).descent());
 919         }
 920
 921         if (vi.p2 < lyx::pit_type(text->paragraphs().size()) - 1) {
 922                 text->redoParagraph(vi.p2 + 1);
 923                 theCoords.parPos()[bv.text()][vi.p2 + 1] =
 924                         Point(0, vi.y2 + text->getPar(vi.p2 + 1).ascent());
 925         }
 926
 927         // and grey out above (should not happen later)
 928 //      lyxerr << "par ascent: " << text->getPar(vi.p1).ascent() << endl;
 929         if (vi.y1 > 0 && !vi.singlepar)
 930                 pain.fillRectangle(0, 0, bv.workWidth(), vi.y1, LColor::bottomarea);
 931
 932         // and possibly grey out below
 933 //      lyxerr << "par descent: " << text->getPar(vi.p1).ascent() << endl;
 934         if (vi.y2 < bv.workHeight() && !vi.singlepar)
 935                 pain.fillRectangle(0, vi.y2, bv.workWidth(), bv.workHeight() - vi.y2, LColor::bottomarea);
 936 }
 937
 938
 939 void paintTextInset(LyXText const & text, PainterInfo & pi, int x, int y)
 940 {
 941 //      lyxerr << "  paintTextInset: y: " << y << endl;
 942
 943         y -= text.getPar(0).ascent();
 944         // This flag can not be set from within same inset:
 945         bool repaintAll = refreshInside;
 946         for (int pit = 0; pit < int(text.paragraphs().size()); ++pit) {
 947                 y += text.getPar(pit).ascent();
 948                 paintPar(pi, text, pit, x, y, repaintAll);
 949                 y += text.getPar(pit).descent();
 950         }
 951 }