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 "metricsinfo.h"
  29 #include "paragraph.h"
  30 #include "paragraph_funcs.h"
  31 #include "ParagraphParameters.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 "support/textutils.h"
  40
  41 #include <boost/crc.hpp>
  42
  43
  44 namespace lyx {
  45
  46 using frontend::Painter;
  47 using frontend::FontMetrics;
  48
  49 using std::endl;
  50 using std::max;
  51 using std::min;
  52 using std::string;
  53
  54
  55 namespace {
  56
  57 /// Flag: do a full redraw of inside text of inset
  58 /// Working variable indicating a full screen refresh
  59 bool refreshInside;
  60
  61 /**
  62  * A class used for painting an individual row of text.
  63  */
  64 class RowPainter {
  65 public:
  66         /// initialise and run painter
  67         RowPainter(PainterInfo & pi, LyXText const & text,
  68                 pit_type pit, Row const & row, int x, int y);
  69
  70         // paint various parts
  71         void paintAppendix();
  72         void paintDepthBar();
  73         void paintChangeBar();
  74         void paintFirst();
  75         void paintLast();
  76         void paintText();
  77
  78 private:
  79         void paintForeignMark(double orig_x, LyXFont const & font, int desc = 0);
  80         void paintHebrewComposeChar(pos_type & vpos, LyXFont const & font);
  81         void paintArabicComposeChar(pos_type & vpos, LyXFont const & font);
  82         void paintChars(pos_type & vpos, LyXFont font,
  83                         bool hebrew, bool arabic);
  84         int paintAppendixStart(int y);
  85         void paintFromPos(pos_type & vpos);
  86         void paintInset(pos_type const pos, LyXFont const & font);
  87
  88         /// return left margin
  89         int leftMargin() const;
  90
  91         /// return the label font for this row
  92         LyXFont const getLabelFont() const;
  93
  94         /// bufferview to paint on
  95         BufferView & bv_;
  96
  97         /// Painter to use
  98         Painter & pain_;
  99
 100         /// LyXText for the row
 101         LyXText const & text_;
 102         ParagraphList const & pars_;
 103
 104         /// The row to paint
 105         Row const & row_;
 106
 107         /// Row's paragraph
 108         pit_type const pit_;
 109         Paragraph const & par_;
 110
 111         /// is row erased? (change tracking)
 112         bool erased_;
 113
 114         // Looks ugly - is
 115         double const xo_;
 116         int const yo_;    // current baseline
 117         double x_;
 118         int width_;
 119         double separator_;
 120         double hfill_;
 121         double label_hfill_;
 122 };
 123
 124
 125 RowPainter::RowPainter(PainterInfo & pi,
 126         LyXText const & text, pit_type pit, Row const & row, int x, int y)
 127         : bv_(*pi.base.bv), pain_(pi.pain), text_(text), pars_(text.paragraphs()),
 128           row_(row), pit_(pit), par_(text.paragraphs()[pit]),
 129           erased_(pi.erased_),
 130           xo_(x), yo_(y), width_(text_.width())
 131 {
 132         RowMetrics m = text_.computeRowMetrics(pit, row_);
 133         x_ = m.x + xo_;
 134
 135         //lyxerr << "RowPainter: x: " << x_ << " xo: " << xo_ << " yo: " << yo_ << endl;
 136         //row_.dump();
 137
 138         separator_ = m.separator;
 139         hfill_ = m.hfill;
 140         label_hfill_ = m.label_hfill;
 141
 142         BOOST_ASSERT(pit >= 0);
 143         BOOST_ASSERT(pit < int(text.paragraphs().size()));
 144 }
 145
 146
 147 LyXFont const RowPainter::getLabelFont() const
 148 {
 149         return text_.getLabelFont(par_);
 150 }
 151
 152
 153 int RowPainter::leftMargin() const
 154 {
 155         return text_.leftMargin(pit_, row_.pos());
 156 }
 157
 158
 159 void RowPainter::paintInset(pos_type const pos, LyXFont const & font)
 160 {
 161         InsetBase const * inset = par_.getInset(pos);
 162         BOOST_ASSERT(inset);
 163         PainterInfo pi(const_cast<BufferView *>(&bv_), pain_);
 164         // FIXME: We should always use font, see documentation of
 165         // noFontChange() in insetbase.h.
 166         pi.base.font = inset->noFontChange() ?
 167                 bv_.buffer()->params().getFont() :
 168                 font;
 169         pi.ltr_pos = (text_.bidi.level(pos) % 2 == 0);
 170         pi.erased_ = erased_ || par_.isDeleted(pos);
 171         bv_.coordCache().insets().add(inset, int(x_), yo_);
 172         InsetText const * const in = inset->asTextInset();
 173         // non-wide insets are painted completely. Recursive
 174         bool tmp = refreshInside;
 175         if (!in || !in->Wide()) {
 176                 refreshInside = true;
 177                 lyxerr[Debug::PAINTING] << endl << "Paint inset fully" << endl;
 178         }
 179         if (refreshInside)
 180                 inset->drawSelection(pi, int(x_), yo_);
 181         inset->draw(pi, int(x_), yo_);
 182         refreshInside = tmp;
 183         x_ += inset->width();
 184 }
 185
 186
 187 void RowPainter::paintHebrewComposeChar(pos_type & vpos, LyXFont const & font)
 188 {
 189         pos_type pos = text_.bidi.vis2log(vpos);
 190
 191         docstring str;
 192
 193         // first char
 194         char_type c = par_.getChar(pos);
 195         str += c;
 196         ++vpos;
 197
 198         int const width = theFontMetrics(font).width(c);
 199         int dx = 0;
 200
 201         for (pos_type i = pos - 1; i >= 0; --i) {
 202                 c = par_.getChar(i);
 203                 if (!Encodings::isComposeChar_hebrew(c)) {
 204                         if (isPrintableNonspace(c)) {
 205                                 int const width2 =
 206                                         text_.singleWidth(par_, i, c, text_.getFont(par_, i));
 207                                 // FIXME UNICODE
 208                                 // This does not work anymore, and non-ascii
 209                                 // characters in source files are forbidden
 210                                 // anyway.
 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         // FIXME UNICODE
 222         pain_.text(int(x_) + dx, yo_, str, font);
 223 }
 224
 225
 226 void RowPainter::paintArabicComposeChar(pos_type & vpos, LyXFont const & font)
 227 {
 228         pos_type pos = text_.bidi.vis2log(vpos);
 229         docstring str;
 230
 231         // first char
 232         char_type c = par_.getChar(pos);
 233         c = par_.transformChar(c, pos);
 234         str += c;
 235         ++vpos;
 236
 237         int const width = theFontMetrics(font).width(c);
 238         int dx = 0;
 239
 240         for (pos_type i = pos - 1; i >= 0; --i) {
 241                 c = par_.getChar(i);
 242                 if (!Encodings::isComposeChar_arabic(c)) {
 243                         if (isPrintableNonspace(c)) {
 244                                 int const width2 =
 245                                         text_.singleWidth(par_, i, c, text_.getFont(par_, i));
 246                                 dx = (width2 - width) / 2;
 247                         }
 248                         break;
 249                 }
 250         }
 251         // Draw nikud
 252         pain_.text(int(x_) + dx, yo_, str, font);
 253 }
 254
 255
 256 void RowPainter::paintChars(pos_type & vpos, LyXFont font,
 257                             bool hebrew, bool arabic)
 258 {
 259         pos_type pos = text_.bidi.vis2log(vpos);
 260         pos_type const end = row_.endpos();
 261         FontSpan const font_span = par_.fontSpan(pos);
 262         Change::Type const prev_change = par_.lookupChange(pos).type;
 263
 264         // first character
 265 #if 0
 266         string str;
 267         str += par_.getChar(pos);
 268 #else
 269         std::vector<char_type> str;
 270         str.push_back(par_.getChar(pos));
 271 #endif
 272         if (arabic) {
 273                 char_type c = str[0];
 274                 str[0] = par_.transformChar(c, pos);
 275         }
 276
 277         // collect as much similar chars as we can
 278         for (++vpos ; vpos < end ; ++vpos) {
 279                 pos = text_.bidi.vis2log(vpos);
 280                 if (pos < font_span.first || pos > font_span.last)
 281                         break;
 282
 283                 if (prev_change != par_.lookupChange(pos).type)
 284                         break;
 285
 286                 char_type c = par_.getChar(pos);
 287
 288                 if (!isPrintableNonspace(c))
 289                         break;
 290
 291                 if (arabic && Encodings::isComposeChar_arabic(c))
 292                         break;
 293
 294                 if (hebrew && Encodings::isComposeChar_hebrew(c))
 295                         break;
 296
 297                 if (arabic)
 298                         c = par_.transformChar(c, pos);
 299
 300 #if 0
 301                 str += c;
 302 #else
 303                 str.push_back(c);
 304 #endif
 305         }
 306
 307         if (prev_change == Change::DELETED)
 308                 font.setColor(LColor::strikeout);
 309         else if (prev_change == Change::INSERTED)
 310                 font.setColor(LColor::newtext);
 311
 312         // Draw text and set the new x position
 313         //lyxerr << "paint row: yo_ " << yo_ << "\n";
 314 #if 0
 315         int width = pain_.text(int(x_), yo_, str, font);
 316 #else
 317         int width = pain_.text(int(x_), yo_, &str[0], str.size(), font);
 318 #endif
 319         x_ += width;
 320 }
 321
 322
 323 void RowPainter::paintForeignMark(double orig_x, LyXFont const & font, int desc)
 324 {
 325         if (!lyxrc.mark_foreign_language)
 326                 return;
 327         if (font.language() == latex_language)
 328                 return;
 329         if (font.language() == bv_.buffer()->params().language)
 330                 return;
 331
 332         int const y = yo_ + 1 + desc;
 333         pain_.line(int(orig_x), y, int(x_), y, LColor::language);
 334 }
 335
 336
 337 void RowPainter::paintFromPos(pos_type & vpos)
 338 {
 339         pos_type const pos = text_.bidi.vis2log(vpos);
 340         LyXFont orig_font = text_.getFont(par_, pos);
 341
 342         double const orig_x = x_;
 343
 344         if (par_.isInset(pos)) {
 345                 paintInset(pos, orig_font);
 346                 ++vpos;
 347                 paintForeignMark(orig_x, orig_font,
 348                         par_.getInset(pos)->descent());
 349                 return;
 350         }
 351
 352         // usual characters, no insets
 353         char_type const c = par_.getChar(pos);
 354
 355         // special case languages
 356         std::string const & lang = orig_font.language()->lang();
 357         bool const hebrew = lang == "hebrew";
 358         bool const arabic = lang == "arabic" &&
 359                 (lyxrc.font_norm_type == LyXRC::ISO_8859_6_8 ||
 360                 lyxrc.font_norm_type == LyXRC::ISO_10646_1);
 361
 362         // draw as many chars as we can
 363         if ((!hebrew && !arabic)
 364                 || (hebrew && !Encodings::isComposeChar_hebrew(c))
 365                 || (arabic && !Encodings::isComposeChar_arabic(c))) {
 366                 paintChars(vpos, orig_font, hebrew, arabic);
 367         } else if (hebrew) {
 368                 paintHebrewComposeChar(vpos, orig_font);
 369         } else if (arabic) {
 370                 paintArabicComposeChar(vpos, orig_font);
 371         }
 372
 373         paintForeignMark(orig_x, orig_font);
 374 }
 375
 376
 377 void RowPainter::paintChangeBar()
 378 {
 379         pos_type const start = row_.pos();
 380         pos_type const end = row_.endpos();
 381
 382         if (start == end || !par_.isChanged(start, end))
 383                 return;
 384
 385         int const height = text_.isLastRow(pit_, row_)
 386                 ? row_.ascent()
 387                 : row_.height();
 388
 389         pain_.fillRectangle(5, yo_ - row_.ascent(), 3, height, LColor::changebar);
 390 }
 391
 392
 393 void RowPainter::paintAppendix()
 394 {
 395         if (!par_.params().appendix())
 396                 return;
 397
 398         int y = yo_ - row_.ascent();
 399
 400         if (par_.params().startOfAppendix())
 401                 y += 2 * defaultRowHeight();
 402
 403         pain_.line(1, y, 1, yo_ + row_.height(), LColor::appendix);
 404         pain_.line(width_ - 2, y, width_ - 2, yo_ + row_.height(), LColor::appendix);
 405 }
 406
 407
 408 void RowPainter::paintDepthBar()
 409 {
 410         depth_type const depth = par_.getDepth();
 411
 412         if (depth <= 0)
 413                 return;
 414
 415         depth_type prev_depth = 0;
 416         if (!text_.isFirstRow(pit_, row_)) {
 417                 pit_type pit2 = pit_;
 418                 if (row_.pos() == 0)
 419                         --pit2;
 420                 prev_depth = pars_[pit2].getDepth();
 421         }
 422
 423         depth_type next_depth = 0;
 424         if (!text_.isLastRow(pit_, row_)) {
 425                 pit_type pit2 = pit_;
 426                 if (row_.endpos() >= pars_[pit2].size())
 427                         ++pit2;
 428                 next_depth = pars_[pit2].getDepth();
 429         }
 430
 431         for (depth_type i = 1; i <= depth; ++i) {
 432                 int const w = nestMargin() / 5;
 433                 int x = int(xo_) + w * i;
 434                 // only consider the changebar space if we're drawing outermost text
 435                 if (text_.isMainText())
 436                         x += changebarMargin();
 437
 438                 int const starty = yo_ - row_.ascent();
 439                 int const h =  row_.height() - 1 - (i - next_depth - 1) * 3;
 440
 441                 pain_.line(x, starty, x, starty + h, LColor::depthbar);
 442
 443                 if (i > prev_depth)
 444                         pain_.fillRectangle(x, starty, w, 2, LColor::depthbar);
 445                 if (i > next_depth)
 446                         pain_.fillRectangle(x, starty + h, w, 2, LColor::depthbar);
 447         }
 448 }
 449
 450
 451 int RowPainter::paintAppendixStart(int y)
 452 {
 453         LyXFont pb_font;
 454         pb_font.setColor(LColor::appendix);
 455         pb_font.decSize();
 456
 457         int w = 0;
 458         int a = 0;
 459         int d = 0;
 460
 461         docstring const label = _("Appendix");
 462         theFontMetrics(pb_font).rectText(label, w, a, d);
 463
 464         int const text_start = int(xo_ + (width_ - w) / 2);
 465         int const text_end = text_start + w;
 466
 467         pain_.rectText(text_start, y + d, label, pb_font, LColor::none, LColor::none);
 468
 469         pain_.line(int(xo_ + 1), y, text_start, y, LColor::appendix);
 470         pain_.line(text_end, y, int(xo_ + width_ - 2), y, LColor::appendix);
 471
 472         return 3 * defaultRowHeight();
 473 }
 474
 475
 476 void RowPainter::paintFirst()
 477 {
 478         ParagraphParameters const & parparams = par_.params();
 479
 480         int y_top = 0;
 481
 482         // start of appendix?
 483         if (parparams.startOfAppendix())
 484                 y_top += paintAppendixStart(yo_ - row_.ascent() + 2 * defaultRowHeight());
 485
 486         Buffer const & buffer = *bv_.buffer();
 487
 488         LyXLayout_ptr const & layout = par_.layout();
 489
 490         if (buffer.params().paragraph_separation == BufferParams::PARSEP_SKIP) {
 491                 if (pit_ != 0) {
 492                         if (layout->latextype == LATEX_PARAGRAPH
 493                                 && !par_.getDepth()) {
 494                                 y_top += buffer.params().getDefSkip().inPixels(bv_);
 495                         } else {
 496                                 LyXLayout_ptr const & playout = pars_[pit_ - 1].layout();
 497                                 if (playout->latextype == LATEX_PARAGRAPH
 498                                         && !pars_[pit_ - 1].getDepth()) {
 499                                         // is it right to use defskip here, too? (AS)
 500                                         y_top += buffer.params().getDefSkip().inPixels(bv_);
 501                                 }
 502                         }
 503                 }
 504         }
 505
 506         bool const is_rtl = text_.isRTL(par_);
 507         bool const is_seq = isFirstInSequence(pit_, text_.paragraphs());
 508         //lyxerr << "paintFirst: " << par_.id() << " is_seq: " << is_seq << std::endl;
 509
 510         // should we print a label?
 511         if (layout->labeltype >= LABEL_STATIC
 512             && (layout->labeltype != LABEL_STATIC
 513                       || layout->latextype != LATEX_ENVIRONMENT
 514                       || is_seq)) {
 515
 516                 LyXFont const font = getLabelFont();
 517                 FontMetrics const & fm = theFontMetrics(font);
 518
 519                 docstring const str = par_.getLabelstring();
 520                 if (!str.empty()) {
 521                         double x = x_;
 522
 523                         // this is special code for the chapter layout. This is
 524                         // printed in an extra row and has a pagebreak at
 525                         // the top.
 526                         if (layout->counter == "chapter") {
 527                                 double spacing_val = 1.0;
 528                                 if (!parparams.spacing().isDefault()) {
 529                                         spacing_val = parparams.spacing().getValue();
 530                                 } else {
 531                                         spacing_val = buffer.params().spacing().getValue();
 532                                 }
 533
 534                                 int const labeladdon = int(fm.maxHeight() * layout->spacing.getValue() * spacing_val);
 535
 536                                 int const maxdesc = int(fm.maxDescent() * layout->spacing.getValue() * spacing_val)
 537                                         + int(layout->parsep) * defaultRowHeight();
 538
 539                                 if (is_rtl) {
 540                                         x = width_ - leftMargin() -
 541                                                 fm.width(str);
 542                                 }
 543
 544                                 pain_.text(int(x), yo_ - maxdesc - labeladdon, str, font);
 545                         } else {
 546                                 // FIXME UNICODE
 547                                 docstring lab = from_utf8(layout->labelsep);
 548                                 if (is_rtl) {
 549                                         x = width_ - leftMargin()
 550                                                 + fm.width(lab);
 551                                 } else {
 552                                         x = x_ - fm.width(lab)
 553                                                 - fm.width(str);
 554                                 }
 555
 556                                 pain_.text(int(x), yo_, str, font);
 557                         }
 558                 }
 559
 560         // the labels at the top of an environment.
 561         // More or less for bibliography
 562         } else if (is_seq &&
 563                 (layout->labeltype == LABEL_TOP_ENVIRONMENT ||
 564                 layout->labeltype == LABEL_BIBLIO ||
 565                 layout->labeltype == LABEL_CENTERED_TOP_ENVIRONMENT)) {
 566                 LyXFont font = getLabelFont();
 567                 if (!par_.getLabelstring().empty()) {
 568                         docstring const str = par_.getLabelstring();
 569                         double spacing_val = 1.0;
 570                         if (!parparams.spacing().isDefault())
 571                                 spacing_val = parparams.spacing().getValue();
 572                         else
 573                                 spacing_val = buffer.params().spacing().getValue();
 574
 575                         FontMetrics const & fm = theFontMetrics(font);
 576
 577                         int const labeladdon = int(fm.maxHeight()
 578                                 * layout->spacing.getValue() * spacing_val);
 579
 580                         int maxdesc =
 581                                 int(fm.maxDescent() * layout->spacing.getValue() * spacing_val
 582                                 + (layout->labelbottomsep * defaultRowHeight()));
 583
 584                         double x = x_;
 585                         if (layout->labeltype == LABEL_CENTERED_TOP_ENVIRONMENT) {
 586                                 if (is_rtl)
 587                                         x = leftMargin();
 588                                 x += (width_ - text_.rightMargin(par_) - leftMargin()) / 2;
 589                                 x -= fm.width(str) / 2;
 590                         } else if (is_rtl) {
 591                                 x = width_ - leftMargin() -     fm.width(str);
 592                         }
 593                         pain_.text(int(x), yo_ - maxdesc - labeladdon, str, font);
 594                 }
 595         }
 596 }
 597
 598
 599 void RowPainter::paintLast()
 600 {
 601         bool const is_rtl = text_.isRTL(par_);
 602         int const endlabel = getEndLabel(pit_, text_.paragraphs());
 603
 604         // draw an endlabel
 605         switch (endlabel) {
 606         case END_LABEL_BOX:
 607         case END_LABEL_FILLED_BOX: {
 608                 LyXFont const font = getLabelFont();
 609                 FontMetrics const & fm = theFontMetrics(font);
 610                 int const size = int(0.75 * fm.maxAscent());
 611                 int const y = yo_ - size;
 612                 int x = is_rtl ? nestMargin() + changebarMargin() : width_ - size;
 613
 614                 if (width_ - int(row_.width()) <= size)
 615                         x += (size - width_ + row_.width() + 1) * (is_rtl ? -1 : 1);
 616
 617                 if (endlabel == END_LABEL_BOX)
 618                         pain_.rectangle(x, y, size, size, LColor::eolmarker);
 619                 else
 620                         pain_.fillRectangle(x, y, size, size, LColor::eolmarker);
 621                 break;
 622         }
 623
 624         case END_LABEL_STATIC: {
 625                 LyXFont font = getLabelFont();
 626                 FontMetrics const & fm = theFontMetrics(font);
 627                 docstring const & str = par_.layout()->endlabelstring();
 628                 double const x = is_rtl ?
 629                         x_ - fm.width(str)
 630                         : - text_.rightMargin(par_) - row_.width();
 631                 pain_.text(int(x), yo_, str, font);
 632                 break;
 633         }
 634
 635         case END_LABEL_NO_LABEL:
 636                 break;
 637         }
 638 }
 639
 640
 641 void RowPainter::paintText()
 642 {
 643         pos_type const end = row_.endpos();
 644         pos_type body_pos = par_.beginOfBody();
 645         if (body_pos > 0 &&
 646                 (body_pos > end || !par_.isLineSeparator(body_pos - 1))) {
 647                 body_pos = 0;
 648         }
 649
 650         LyXLayout_ptr const & layout = par_.layout();
 651
 652         bool running_strikeout = false;
 653         bool is_struckout = false;
 654         int last_strikeout_x = 0;
 655
 656         // Use font span to speed things up, see below
 657         FontSpan font_span;
 658         LyXFont font;
 659
 660         for (pos_type vpos = row_.pos(); vpos < end; ) {
 661                 if (x_ > bv_.workWidth())
 662                         break;
 663
 664                 pos_type const pos = text_.bidi.vis2log(vpos);
 665
 666                 if (pos >= par_.size()) {
 667                         ++vpos;
 668                         continue;
 669                 }
 670
 671                 // Use font span to speed things up, see above
 672                 if (vpos < font_span.first || vpos > font_span.last) {
 673                         font_span = par_.fontSpan(vpos);
 674                         font = text_.getFont(par_, vpos);
 675                 }
 676
 677                 const int width_pos =
 678                         text_.singleWidth(par_, pos, par_.getChar(pos), font);
 679
 680                 if (x_ + width_pos < 0) {
 681                         x_ += width_pos;
 682                         ++vpos;
 683                         continue;
 684                 }
 685
 686                 is_struckout = par_.isDeleted(pos);
 687
 688                 if (is_struckout && !running_strikeout) {
 689                         running_strikeout = true;
 690                         last_strikeout_x = int(x_);
 691                 }
 692
 693                 bool const highly_editable_inset = par_.isInset(pos)
 694                         && isHighlyEditableInset(par_.getInset(pos));
 695
 696                 // If we reach the end of a struck out range, paint it.
 697                 // We also don't paint across things like tables
 698                 if (running_strikeout && (highly_editable_inset || !is_struckout)) {
 699                         // Calculate 1/3 height of the buffer's default font
 700                         FontMetrics const & fm
 701                                 = theFontMetrics(bv_.buffer()->params().getFont());
 702                         int const middle = yo_ - fm.maxAscent() / 3;
 703                         pain_.line(last_strikeout_x, middle, int(x_), middle,
 704                                 LColor::strikeout, Painter::line_solid, Painter::line_thin);
 705                         running_strikeout = false;
 706                 }
 707
 708                 if (body_pos > 0 && pos == body_pos - 1) {
 709                         // FIXME UNICODE
 710                         int const lwidth = theFontMetrics(getLabelFont())
 711                                 .width(from_utf8(layout->labelsep));
 712
 713                         x_ += label_hfill_ + lwidth - width_pos;
 714                 }
 715
 716                 if (par_.isHfill(pos)) {
 717                         x_ += 1;
 718
 719                         int const y0 = yo_;
 720                         int const y1 = y0 - defaultRowHeight() / 2;
 721
 722                         pain_.line(int(x_), y1, int(x_), y0, LColor::added_space);
 723
 724                         if (par_.hfillExpansion(row_, pos)) {
 725                                 int const y2 = (y0 + y1) / 2;
 726
 727                                 if (pos >= body_pos) {
 728                                         pain_.line(int(x_), y2, int(x_ + hfill_), y2,
 729                                                   LColor::added_space,
 730                                                   Painter::line_onoffdash);
 731                                         x_ += hfill_;
 732                                 } else {
 733                                         pain_.line(int(x_), y2, int(x_ + label_hfill_), y2,
 734                                                   LColor::added_space,
 735                                                   Painter::line_onoffdash);
 736                                         x_ += label_hfill_;
 737                                 }
 738                                 pain_.line(int(x_), y1, int(x_), y0, LColor::added_space);
 739                         }
 740                         x_ += 2;
 741                         ++vpos;
 742                 } else if (par_.isSeparator(pos)) {
 743                         x_ += width_pos;
 744                         if (pos >= body_pos)
 745                                 x_ += separator_;
 746                         ++vpos;
 747                 } else {
 748                         paintFromPos(vpos);
 749                 }
 750         }
 751
 752         // if we reach the end of a struck out range, paint it
 753         if (running_strikeout) {
 754                 // calculate 1/3 height of the buffer's default font
 755                 FontMetrics const & fm
 756                         = theFontMetrics(bv_.buffer()->params().getFont());
 757                 int const middle = yo_ - fm.maxAscent() / 3;
 758                 pain_.line(last_strikeout_x, middle, int(x_), middle,
 759                         LColor::strikeout, Painter::line_solid, Painter::line_thin);
 760                 running_strikeout = false;
 761         }
 762 }
 763
 764
 765 size_type calculateRowSignature(Row const & row, Paragraph const & par,
 766         int x, int y)
 767 {
 768         boost::crc_32_type crc;
 769         for (pos_type i = row.pos(); i < row.endpos(); ++i) {
 770                 char_type const b[] = { par.getChar(i) };
 771                 crc.process_bytes(b, 1);
 772         }
 773         char_type const b[] = { x, y, row.width() };
 774         crc.process_bytes(b, 3);
 775         return crc.checksum();
 776 }
 777
 778
 779 bool CursorOnRow(PainterInfo & pi, pit_type const pit,
 780         RowList::const_iterator rit, LyXText const & text)
 781 {
 782         // Is there a cursor on this row (or inside inset on row)
 783         LCursor & cur = pi.base.bv->cursor();
 784         for (size_type d = 0; d < cur.depth(); ++d) {
 785                 CursorSlice const & sl = cur[d];
 786                 if (sl.text() == &text
 787                     && sl.pit() == pit
 788                     && sl.pos() >= rit->pos()
 789                     && sl.pos() <= rit->endpos())
 790                         return true;
 791         }
 792         return false;
 793 }
 794
 795
 796 bool innerCursorOnRow(PainterInfo & pi, pit_type pit,
 797         RowList::const_iterator rit, LyXText const & text)
 798 {
 799         // Is there a cursor inside an inset on this row, and is this inset
 800         // the only "character" on this row
 801         LCursor & cur = pi.base.bv->cursor();
 802         if (rit->pos() + 1 != rit->endpos())
 803                 return false;
 804         for (size_type d = 0; d < cur.depth(); d++) {
 805                 CursorSlice const & sl = cur[d];
 806                 if (sl.text() == &text
 807                     && sl.pit() == pit
 808                     && sl.pos() == rit->pos())
 809                         return d < cur.depth() - 1;
 810         }
 811         return false;
 812 }
 813
 814
 815 void paintPar
 816         (PainterInfo & pi, LyXText const & text, pit_type pit, int x, int y,
 817          bool repaintAll)
 818 {
 819 //      lyxerr << "  paintPar: pit: " << pit << " at y: " << y << endl;
 820         int const ww = pi.base.bv->workHeight();
 821
 822         pi.base.bv->coordCache().parPos()[&text][pit] = Point(x, y);
 823
 824         Paragraph const & par = text.paragraphs()[pit];
 825         if (par.rows().empty())
 826                 return;
 827
 828         RowList::const_iterator const rb = par.rows().begin();
 829         RowList::const_iterator const re = par.rows().end();
 830
 831         y -= rb->ascent();
 832         size_type rowno = 0;
 833         for (RowList::const_iterator rit = rb; rit != re; ++rit, ++rowno) {
 834                 y += rit->ascent();
 835                 // Allow setting of refreshInside for nested insets in
 836                 // this row only
 837                 bool tmp = refreshInside;
 838
 839                 // Row signature; has row changed since last paint?
 840                 size_type const row_sig = calculateRowSignature(*rit, par, x, y);
 841                 bool row_has_changed = par.rowSignature()[rowno] != row_sig;
 842
 843                 bool cursor_on_row = CursorOnRow(pi, pit, rit, text);
 844                 bool in_inset_alone_on_row = innerCursorOnRow(pi, pit, rit,
 845                         text);
 846
 847                 // If this is the only object on the row, we can make it wide
 848                 for (pos_type i = rit->pos() ; i != rit->endpos(); ++i) {
 849                         InsetBase const * const in = par.getInset(i);
 850                         if (in) {
 851                                 InsetText const * const t = in->asTextInset();
 852                                 if (t)
 853                                         t->Wide() = in_inset_alone_on_row;
 854                         }
 855                 }
 856
 857                 // If selection is on, the current row signature differs
 858                 // from cache, or cursor is inside an inset _on this row_,
 859                 // then paint the row
 860                 if (repaintAll || row_has_changed || cursor_on_row) {
 861                         // Add to row signature cache
 862                         par.rowSignature()[rowno] = row_sig;
 863
 864                         bool const inside = (y + rit->descent() >= 0
 865                                        && y - rit->ascent() < ww);
 866                         RowPainter rp(pi, text, pit, *rit, x, y);
 867                         // Clear background of this row
 868                         // (if paragraph background was not cleared)
 869                         if (!repaintAll &&
 870                             (!in_inset_alone_on_row || row_has_changed)) {
 871                                 pi.pain.fillRectangle(x, y - rit->ascent(),
 872                                     text.maxwidth_, rit->height(),
 873                                     text.backgroundColor());
 874                                 // If outer row has changed, force nested
 875                                 // insets to repaint completely
 876                                 if (row_has_changed)
 877                                         refreshInside = true;
 878                         }
 879
 880                         // Instrumentation for testing row cache (see also
 881                         // 12 lines lower):
 882                         if (text.isMainText())
 883                                 lyxerr[Debug::PAINTING] << "#";
 884                         else
 885                                 lyxerr[Debug::PAINTING] << "[" <<
 886                                     repaintAll << row_has_changed <<
 887                                     cursor_on_row << "]";
 888                         rp.paintAppendix();
 889                         rp.paintDepthBar();
 890                         rp.paintChangeBar();
 891                         if (rit == rb)
 892                                 rp.paintFirst();
 893                         if (rit + 1 == re)
 894                                 rp.paintLast();
 895                         rp.paintText();
 896                 }
 897                 y += rit->descent();
 898                 // Restore, see above
 899                 refreshInside = tmp;
 900         }
 901         lyxerr[Debug::PAINTING] << "." << endl;
 902 }
 903
 904 } // namespace anon
 905
 906
 907 void paintText(BufferView & bv, ViewMetricsInfo const & vi,
 908                Painter & pain)
 909 {
 910         LyXText & text = bv.buffer()->text();
 911         bool const select = bv.cursor().selection();
 912
 913         PainterInfo pi(const_cast<BufferView *>(&bv), pain);
 914         // Should the whole screen, including insets, be refreshed?
 915         bool repaintAll = select || !vi.singlepar;
 916
 917         if (repaintAll) {
 918                 // Clear background (if not delegated to rows)
 919                 pain.fillRectangle(0, vi.y1, bv.workWidth(), vi.y2 - vi.y1,
 920                         text.backgroundColor());
 921         }
 922         if (select) {
 923                 text.drawSelection(pi, 0, 0);
 924         }
 925
 926         int yy = vi.y1;
 927         // draw contents
 928         for (pit_type pit = vi.p1; pit <= vi.p2; ++pit) {
 929                 refreshInside = repaintAll;
 930                 Paragraph const & par = text.getPar(pit);
 931                 yy += par.ascent();
 932                 paintPar(pi, text, pit, 0, yy, repaintAll);
 933                 yy += par.descent();
 934         }
 935
 936         // Cache one paragraph above and one below
 937         // Note MV: this cannot be suppressed even for singlepar.
 938         // Try viewing the User Guide Mobius figure
 939
 940         if (vi.p1 > 0) {
 941                 text.redoParagraph(vi.p1 - 1);
 942                 bv.coordCache().parPos()[&text][vi.p1 - 1] =
 943                         Point(0, vi.y1 - text.getPar(vi.p1 - 1).descent());
 944         }
 945
 946         if (vi.p2 < pit_type(text.paragraphs().size()) - 1) {
 947                 text.redoParagraph(vi.p2 + 1);
 948                 bv.coordCache().parPos()[&text][vi.p2 + 1] =
 949                         Point(0, vi.y2 + text.getPar(vi.p2 + 1).ascent());
 950         }
 951
 952         // and grey out above (should not happen later)
 953 //      lyxerr << "par ascent: " << text.getPar(vi.p1).ascent() << endl;
 954         if (vi.y1 > 0 && !vi.singlepar)
 955                 pain.fillRectangle(0, 0, bv.workWidth(), vi.y1, LColor::bottomarea);
 956
 957         // and possibly grey out below
 958 //      lyxerr << "par descent: " << text.getPar(vi.p1).ascent() << endl;
 959         if (vi.y2 < bv.workHeight() && !vi.singlepar)
 960                 pain.fillRectangle(0, vi.y2, bv.workWidth(), bv.workHeight() - vi.y2, LColor::bottomarea);
 961 }
 962
 963
 964 void paintTextInset(LyXText const & text, PainterInfo & pi, int x, int y)
 965 {
 966 //      lyxerr << "  paintTextInset: y: " << y << endl;
 967
 968         y -= text.getPar(0).ascent();
 969         // This flag can not be set from within same inset:
 970         bool repaintAll = refreshInside;
 971         for (int pit = 0; pit < int(text.paragraphs().size()); ++pit) {
 972                 y += text.getPar(pit).ascent();
 973                 paintPar(pi, text, pit, x, y, repaintAll);
 974                 y += text.getPar(pit).descent();
 975         }
 976 }
 977
 978
 979 } // namespace lyx