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.reserve(100);
 271         str.push_back(par_.getChar(pos));
 272 #endif
 273         if (arabic) {
 274                 char_type c = str[0];
 275                 str[0] = par_.transformChar(c, pos);
 276         }
 277
 278         // collect as much similar chars as we can
 279         for (++vpos ; vpos < end ; ++vpos) {
 280                 pos = text_.bidi.vis2log(vpos);
 281                 if (pos < font_span.first || pos > font_span.last)
 282                         break;
 283
 284                 if (prev_change != par_.lookupChange(pos).type)
 285                         break;
 286
 287                 char_type c = par_.getChar(pos);
 288
 289                 if (!isPrintableNonspace(c))
 290                         break;
 291
 292                 if (arabic && Encodings::isComposeChar_arabic(c))
 293                         break;
 294
 295                 if (hebrew && Encodings::isComposeChar_hebrew(c))
 296                         break;
 297
 298                 if (arabic)
 299                         c = par_.transformChar(c, pos);
 300
 301 #if 0
 302                 str += c;
 303 #else
 304                 str.push_back(c);
 305 #endif
 306         }
 307
 308         if (prev_change == Change::DELETED)
 309                 font.setColor(LColor::strikeout);
 310         else if (prev_change == Change::INSERTED)
 311                 font.setColor(LColor::newtext);
 312
 313         // Draw text and set the new x position
 314         //lyxerr << "paint row: yo_ " << yo_ << "\n";
 315 #if 0
 316         int width = pain_.text(int(x_), yo_, str, font);
 317 #else
 318         int width = pain_.text(int(x_), yo_, &str[0], str.size(), font);
 319 #endif
 320         x_ += width;
 321 }
 322
 323
 324 void RowPainter::paintForeignMark(double orig_x, LyXFont const & font, int desc)
 325 {
 326         if (!lyxrc.mark_foreign_language)
 327                 return;
 328         if (font.language() == latex_language)
 329                 return;
 330         if (font.language() == bv_.buffer()->params().language)
 331                 return;
 332
 333         int const y = yo_ + 1 + desc;
 334         pain_.line(int(orig_x), y, int(x_), y, LColor::language);
 335 }
 336
 337
 338 void RowPainter::paintFromPos(pos_type & vpos)
 339 {
 340         pos_type const pos = text_.bidi.vis2log(vpos);
 341         LyXFont orig_font = text_.getFont(par_, pos);
 342
 343         double const orig_x = x_;
 344
 345         if (par_.isInset(pos)) {
 346                 paintInset(pos, orig_font);
 347                 ++vpos;
 348                 paintForeignMark(orig_x, orig_font,
 349                         par_.getInset(pos)->descent());
 350                 return;
 351         }
 352
 353         // usual characters, no insets
 354         char_type const c = par_.getChar(pos);
 355
 356         // special case languages
 357         std::string const & lang = orig_font.language()->lang();
 358         bool const hebrew = lang == "hebrew";
 359         bool const arabic = lang == "arabic" &&
 360                 (lyxrc.font_norm_type == LyXRC::ISO_8859_6_8 ||
 361                 lyxrc.font_norm_type == LyXRC::ISO_10646_1);
 362
 363         // draw as many chars as we can
 364         if ((!hebrew && !arabic)
 365                 || (hebrew && !Encodings::isComposeChar_hebrew(c))
 366                 || (arabic && !Encodings::isComposeChar_arabic(c))) {
 367                 paintChars(vpos, orig_font, hebrew, arabic);
 368         } else if (hebrew) {
 369                 paintHebrewComposeChar(vpos, orig_font);
 370         } else if (arabic) {
 371                 paintArabicComposeChar(vpos, orig_font);
 372         }
 373
 374         paintForeignMark(orig_x, orig_font);
 375 }
 376
 377
 378 void RowPainter::paintChangeBar()
 379 {
 380         pos_type const start = row_.pos();
 381         pos_type const end = row_.endpos();
 382
 383         if (start == end || !par_.isChanged(start, end))
 384                 return;
 385
 386         int const height = text_.isLastRow(pit_, row_)
 387                 ? row_.ascent()
 388                 : row_.height();
 389
 390         pain_.fillRectangle(5, yo_ - row_.ascent(), 3, height, LColor::changebar);
 391 }
 392
 393
 394 void RowPainter::paintAppendix()
 395 {
 396         if (!par_.params().appendix())
 397                 return;
 398
 399         int y = yo_ - row_.ascent();
 400
 401         if (par_.params().startOfAppendix())
 402                 y += 2 * defaultRowHeight();
 403
 404         pain_.line(1, y, 1, yo_ + row_.height(), LColor::appendix);
 405         pain_.line(width_ - 2, y, width_ - 2, yo_ + row_.height(), LColor::appendix);
 406 }
 407
 408
 409 void RowPainter::paintDepthBar()
 410 {
 411         depth_type const depth = par_.getDepth();
 412
 413         if (depth <= 0)
 414                 return;
 415
 416         depth_type prev_depth = 0;
 417         if (!text_.isFirstRow(pit_, row_)) {
 418                 pit_type pit2 = pit_;
 419                 if (row_.pos() == 0)
 420                         --pit2;
 421                 prev_depth = pars_[pit2].getDepth();
 422         }
 423
 424         depth_type next_depth = 0;
 425         if (!text_.isLastRow(pit_, row_)) {
 426                 pit_type pit2 = pit_;
 427                 if (row_.endpos() >= pars_[pit2].size())
 428                         ++pit2;
 429                 next_depth = pars_[pit2].getDepth();
 430         }
 431
 432         for (depth_type i = 1; i <= depth; ++i) {
 433                 int const w = nestMargin() / 5;
 434                 int x = int(xo_) + w * i;
 435                 // only consider the changebar space if we're drawing outermost text
 436                 if (text_.isMainText())
 437                         x += changebarMargin();
 438
 439                 int const starty = yo_ - row_.ascent();
 440                 int const h =  row_.height() - 1 - (i - next_depth - 1) * 3;
 441
 442                 pain_.line(x, starty, x, starty + h, LColor::depthbar);
 443
 444                 if (i > prev_depth)
 445                         pain_.fillRectangle(x, starty, w, 2, LColor::depthbar);
 446                 if (i > next_depth)
 447                         pain_.fillRectangle(x, starty + h, w, 2, LColor::depthbar);
 448         }
 449 }
 450
 451
 452 int RowPainter::paintAppendixStart(int y)
 453 {
 454         LyXFont pb_font;
 455         pb_font.setColor(LColor::appendix);
 456         pb_font.decSize();
 457
 458         int w = 0;
 459         int a = 0;
 460         int d = 0;
 461
 462         docstring const label = _("Appendix");
 463         theFontMetrics(pb_font).rectText(label, w, a, d);
 464
 465         int const text_start = int(xo_ + (width_ - w) / 2);
 466         int const text_end = text_start + w;
 467
 468         pain_.rectText(text_start, y + d, label, pb_font, LColor::none, LColor::none);
 469
 470         pain_.line(int(xo_ + 1), y, text_start, y, LColor::appendix);
 471         pain_.line(text_end, y, int(xo_ + width_ - 2), y, LColor::appendix);
 472
 473         return 3 * defaultRowHeight();
 474 }
 475
 476
 477 void RowPainter::paintFirst()
 478 {
 479         ParagraphParameters const & parparams = par_.params();
 480
 481         int y_top = 0;
 482
 483         // start of appendix?
 484         if (parparams.startOfAppendix())
 485                 y_top += paintAppendixStart(yo_ - row_.ascent() + 2 * defaultRowHeight());
 486
 487         Buffer const & buffer = *bv_.buffer();
 488
 489         LyXLayout_ptr const & layout = par_.layout();
 490
 491         if (buffer.params().paragraph_separation == BufferParams::PARSEP_SKIP) {
 492                 if (pit_ != 0) {
 493                         if (layout->latextype == LATEX_PARAGRAPH
 494                                 && !par_.getDepth()) {
 495                                 y_top += buffer.params().getDefSkip().inPixels(bv_);
 496                         } else {
 497                                 LyXLayout_ptr const & playout = pars_[pit_ - 1].layout();
 498                                 if (playout->latextype == LATEX_PARAGRAPH
 499                                         && !pars_[pit_ - 1].getDepth()) {
 500                                         // is it right to use defskip here, too? (AS)
 501                                         y_top += buffer.params().getDefSkip().inPixels(bv_);
 502                                 }
 503                         }
 504                 }
 505         }
 506
 507         bool const is_rtl = text_.isRTL(par_);
 508         bool const is_seq = isFirstInSequence(pit_, text_.paragraphs());
 509         //lyxerr << "paintFirst: " << par_.id() << " is_seq: " << is_seq << std::endl;
 510
 511         // should we print a label?
 512         if (layout->labeltype >= LABEL_STATIC
 513             && (layout->labeltype != LABEL_STATIC
 514                       || layout->latextype != LATEX_ENVIRONMENT
 515                       || is_seq)) {
 516
 517                 LyXFont const font = getLabelFont();
 518                 FontMetrics const & fm = theFontMetrics(font);
 519
 520                 docstring const str = par_.getLabelstring();
 521                 if (!str.empty()) {
 522                         double x = x_;
 523
 524                         // this is special code for the chapter layout. This is
 525                         // printed in an extra row and has a pagebreak at
 526                         // the top.
 527                         if (layout->counter == "chapter") {
 528                                 double spacing_val = 1.0;
 529                                 if (!parparams.spacing().isDefault()) {
 530                                         spacing_val = parparams.spacing().getValue();
 531                                 } else {
 532                                         spacing_val = buffer.params().spacing().getValue();
 533                                 }
 534
 535                                 int const labeladdon = int(fm.maxHeight() * layout->spacing.getValue() * spacing_val);
 536
 537                                 int const maxdesc = int(fm.maxDescent() * layout->spacing.getValue() * spacing_val)
 538                                         + int(layout->parsep) * defaultRowHeight();
 539
 540                                 if (is_rtl) {
 541                                         x = width_ - leftMargin() -
 542                                                 fm.width(str);
 543                                 }
 544
 545                                 pain_.text(int(x), yo_ - maxdesc - labeladdon, str, font);
 546                         } else {
 547                                 // FIXME UNICODE
 548                                 docstring lab = from_utf8(layout->labelsep);
 549                                 if (is_rtl) {
 550                                         x = width_ - leftMargin()
 551                                                 + fm.width(lab);
 552                                 } else {
 553                                         x = x_ - fm.width(lab)
 554                                                 - fm.width(str);
 555                                 }
 556
 557                                 pain_.text(int(x), yo_, str, font);
 558                         }
 559                 }
 560
 561         // the labels at the top of an environment.
 562         // More or less for bibliography
 563         } else if (is_seq &&
 564                 (layout->labeltype == LABEL_TOP_ENVIRONMENT ||
 565                 layout->labeltype == LABEL_BIBLIO ||
 566                 layout->labeltype == LABEL_CENTERED_TOP_ENVIRONMENT)) {
 567                 LyXFont font = getLabelFont();
 568                 if (!par_.getLabelstring().empty()) {
 569                         docstring const str = par_.getLabelstring();
 570                         double spacing_val = 1.0;
 571                         if (!parparams.spacing().isDefault())
 572                                 spacing_val = parparams.spacing().getValue();
 573                         else
 574                                 spacing_val = buffer.params().spacing().getValue();
 575
 576                         FontMetrics const & fm = theFontMetrics(font);
 577
 578                         int const labeladdon = int(fm.maxHeight()
 579                                 * layout->spacing.getValue() * spacing_val);
 580
 581                         int maxdesc =
 582                                 int(fm.maxDescent() * layout->spacing.getValue() * spacing_val
 583                                 + (layout->labelbottomsep * defaultRowHeight()));
 584
 585                         double x = x_;
 586                         if (layout->labeltype == LABEL_CENTERED_TOP_ENVIRONMENT) {
 587                                 if (is_rtl)
 588                                         x = leftMargin();
 589                                 x += (width_ - text_.rightMargin(par_) - leftMargin()) / 2;
 590                                 x -= fm.width(str) / 2;
 591                         } else if (is_rtl) {
 592                                 x = width_ - leftMargin() -     fm.width(str);
 593                         }
 594                         pain_.text(int(x), yo_ - maxdesc - labeladdon, str, font);
 595                 }
 596         }
 597 }
 598
 599
 600 void RowPainter::paintLast()
 601 {
 602         bool const is_rtl = text_.isRTL(par_);
 603         int const endlabel = getEndLabel(pit_, text_.paragraphs());
 604
 605         // draw an endlabel
 606         switch (endlabel) {
 607         case END_LABEL_BOX:
 608         case END_LABEL_FILLED_BOX: {
 609                 LyXFont const font = getLabelFont();
 610                 FontMetrics const & fm = theFontMetrics(font);
 611                 int const size = int(0.75 * fm.maxAscent());
 612                 int const y = yo_ - size;
 613                 int x = is_rtl ? nestMargin() + changebarMargin() : width_ - size;
 614
 615                 if (width_ - int(row_.width()) <= size)
 616                         x += (size - width_ + row_.width() + 1) * (is_rtl ? -1 : 1);
 617
 618                 if (endlabel == END_LABEL_BOX)
 619                         pain_.rectangle(x, y, size, size, LColor::eolmarker);
 620                 else
 621                         pain_.fillRectangle(x, y, size, size, LColor::eolmarker);
 622                 break;
 623         }
 624
 625         case END_LABEL_STATIC: {
 626                 LyXFont font = getLabelFont();
 627                 FontMetrics const & fm = theFontMetrics(font);
 628                 docstring const & str = par_.layout()->endlabelstring();
 629                 double const x = is_rtl ?
 630                         x_ - fm.width(str)
 631                         : - text_.rightMargin(par_) - row_.width();
 632                 pain_.text(int(x), yo_, str, font);
 633                 break;
 634         }
 635
 636         case END_LABEL_NO_LABEL:
 637                 break;
 638         }
 639 }
 640
 641
 642 void RowPainter::paintText()
 643 {
 644         pos_type const end = row_.endpos();
 645         pos_type body_pos = par_.beginOfBody();
 646         if (body_pos > 0 &&
 647                 (body_pos > end || !par_.isLineSeparator(body_pos - 1))) {
 648                 body_pos = 0;
 649         }
 650
 651         LyXLayout_ptr const & layout = par_.layout();
 652
 653         bool running_strikeout = false;
 654         bool is_struckout = false;
 655         int last_strikeout_x = 0;
 656
 657         // Use font span to speed things up, see below
 658         FontSpan font_span;
 659         LyXFont font;
 660
 661         for (pos_type vpos = row_.pos(); vpos < end; ) {
 662                 if (x_ > bv_.workWidth())
 663                         break;
 664
 665                 pos_type const pos = text_.bidi.vis2log(vpos);
 666
 667                 if (pos >= par_.size()) {
 668                         ++vpos;
 669                         continue;
 670                 }
 671
 672                 // Use font span to speed things up, see above
 673                 if (vpos < font_span.first || vpos > font_span.last) {
 674                         font_span = par_.fontSpan(vpos);
 675                         font = text_.getFont(par_, vpos);
 676                 }
 677
 678                 const int width_pos =
 679                         text_.singleWidth(par_, pos, par_.getChar(pos), font);
 680
 681                 if (x_ + width_pos < 0) {
 682                         x_ += width_pos;
 683                         ++vpos;
 684                         continue;
 685                 }
 686
 687                 is_struckout = par_.isDeleted(pos);
 688
 689                 if (is_struckout && !running_strikeout) {
 690                         running_strikeout = true;
 691                         last_strikeout_x = int(x_);
 692                 }
 693
 694                 bool const highly_editable_inset = par_.isInset(pos)
 695                         && isHighlyEditableInset(par_.getInset(pos));
 696
 697                 // If we reach the end of a struck out range, paint it.
 698                 // We also don't paint across things like tables
 699                 if (running_strikeout && (highly_editable_inset || !is_struckout)) {
 700                         // Calculate 1/3 height of the buffer's default font
 701                         FontMetrics const & fm
 702                                 = theFontMetrics(bv_.buffer()->params().getFont());
 703                         int const middle = yo_ - fm.maxAscent() / 3;
 704                         pain_.line(last_strikeout_x, middle, int(x_), middle,
 705                                 LColor::strikeout, Painter::line_solid, Painter::line_thin);
 706                         running_strikeout = false;
 707                 }
 708
 709                 if (body_pos > 0 && pos == body_pos - 1) {
 710                         // FIXME UNICODE
 711                         int const lwidth = theFontMetrics(getLabelFont())
 712                                 .width(from_utf8(layout->labelsep));
 713
 714                         x_ += label_hfill_ + lwidth - width_pos;
 715                 }
 716
 717                 if (par_.isHfill(pos)) {
 718                         x_ += 1;
 719
 720                         int const y0 = yo_;
 721                         int const y1 = y0 - defaultRowHeight() / 2;
 722
 723                         pain_.line(int(x_), y1, int(x_), y0, LColor::added_space);
 724
 725                         if (par_.hfillExpansion(row_, pos)) {
 726                                 int const y2 = (y0 + y1) / 2;
 727
 728                                 if (pos >= body_pos) {
 729                                         pain_.line(int(x_), y2, int(x_ + hfill_), y2,
 730                                                   LColor::added_space,
 731                                                   Painter::line_onoffdash);
 732                                         x_ += hfill_;
 733                                 } else {
 734                                         pain_.line(int(x_), y2, int(x_ + label_hfill_), y2,
 735                                                   LColor::added_space,
 736                                                   Painter::line_onoffdash);
 737                                         x_ += label_hfill_;
 738                                 }
 739                                 pain_.line(int(x_), y1, int(x_), y0, LColor::added_space);
 740                         }
 741                         x_ += 2;
 742                         ++vpos;
 743                 } else if (par_.isSeparator(pos)) {
 744                         x_ += width_pos;
 745                         if (pos >= body_pos)
 746                                 x_ += separator_;
 747                         ++vpos;
 748                 } else {
 749                         paintFromPos(vpos);
 750                 }
 751         }
 752
 753         // if we reach the end of a struck out range, paint it
 754         if (running_strikeout) {
 755                 // calculate 1/3 height of the buffer's default font
 756                 FontMetrics const & fm
 757                         = theFontMetrics(bv_.buffer()->params().getFont());
 758                 int const middle = yo_ - fm.maxAscent() / 3;
 759                 pain_.line(last_strikeout_x, middle, int(x_), middle,
 760                         LColor::strikeout, Painter::line_solid, Painter::line_thin);
 761                 running_strikeout = false;
 762         }
 763 }
 764
 765
 766 size_type calculateRowSignature(Row const & row, Paragraph const & par,
 767         int x, int y)
 768 {
 769         boost::crc_32_type crc;
 770         for (pos_type i = row.pos(); i < row.endpos(); ++i) {
 771                 char_type const b[] = { par.getChar(i) };
 772                 crc.process_bytes(b, 1);
 773         }
 774         char_type const b[] = { x, y, row.width() };
 775         crc.process_bytes(b, 3);
 776         return crc.checksum();
 777 }
 778
 779
 780 bool CursorOnRow(PainterInfo & pi, pit_type const pit,
 781         RowList::const_iterator rit, LyXText const & text)
 782 {
 783         // Is there a cursor on this row (or inside inset on row)
 784         LCursor & cur = pi.base.bv->cursor();
 785         for (size_type d = 0; d < cur.depth(); ++d) {
 786                 CursorSlice const & sl = cur[d];
 787                 if (sl.text() == &text
 788                     && sl.pit() == pit
 789                     && sl.pos() >= rit->pos()
 790                     && sl.pos() <= rit->endpos())
 791                         return true;
 792         }
 793         return false;
 794 }
 795
 796
 797 bool innerCursorOnRow(PainterInfo & pi, pit_type pit,
 798         RowList::const_iterator rit, LyXText const & text)
 799 {
 800         // Is there a cursor inside an inset on this row, and is this inset
 801         // the only "character" on this row
 802         LCursor & cur = pi.base.bv->cursor();
 803         if (rit->pos() + 1 != rit->endpos())
 804                 return false;
 805         for (size_type d = 0; d < cur.depth(); d++) {
 806                 CursorSlice const & sl = cur[d];
 807                 if (sl.text() == &text
 808                     && sl.pit() == pit
 809                     && sl.pos() == rit->pos())
 810                         return d < cur.depth() - 1;
 811         }
 812         return false;
 813 }
 814
 815
 816 void paintPar
 817         (PainterInfo & pi, LyXText const & text, pit_type pit, int x, int y,
 818          bool repaintAll)
 819 {
 820 //      lyxerr << "  paintPar: pit: " << pit << " at y: " << y << endl;
 821         int const ww = pi.base.bv->workHeight();
 822
 823         pi.base.bv->coordCache().parPos()[&text][pit] = Point(x, y);
 824
 825         Paragraph const & par = text.paragraphs()[pit];
 826         if (par.rows().empty())
 827                 return;
 828
 829         RowList::const_iterator const rb = par.rows().begin();
 830         RowList::const_iterator const re = par.rows().end();
 831
 832         y -= rb->ascent();
 833         size_type rowno = 0;
 834         for (RowList::const_iterator rit = rb; rit != re; ++rit, ++rowno) {
 835                 y += rit->ascent();
 836                 // Allow setting of refreshInside for nested insets in
 837                 // this row only
 838                 bool tmp = refreshInside;
 839
 840                 // Row signature; has row changed since last paint?
 841                 size_type const row_sig = calculateRowSignature(*rit, par, x, y);
 842                 bool row_has_changed = par.rowSignature()[rowno] != row_sig;
 843
 844                 bool cursor_on_row = CursorOnRow(pi, pit, rit, text);
 845                 bool in_inset_alone_on_row = innerCursorOnRow(pi, pit, rit,
 846                         text);
 847
 848                 // If this is the only object on the row, we can make it wide
 849                 for (pos_type i = rit->pos() ; i != rit->endpos(); ++i) {
 850                         InsetBase const * const in = par.getInset(i);
 851                         if (in) {
 852                                 InsetText const * const t = in->asTextInset();
 853                                 if (t)
 854                                         t->Wide() = in_inset_alone_on_row;
 855                         }
 856                 }
 857
 858                 // If selection is on, the current row signature differs
 859                 // from cache, or cursor is inside an inset _on this row_,
 860                 // then paint the row
 861                 if (repaintAll || row_has_changed || cursor_on_row) {
 862                         // Add to row signature cache
 863                         par.rowSignature()[rowno] = row_sig;
 864
 865                         bool const inside = (y + rit->descent() >= 0
 866                                        && y - rit->ascent() < ww);
 867                         RowPainter rp(pi, text, pit, *rit, x, y);
 868                         // Clear background of this row
 869                         // (if paragraph background was not cleared)
 870                         if (!repaintAll &&
 871                             (!in_inset_alone_on_row || row_has_changed)) {
 872                                 pi.pain.fillRectangle(x, y - rit->ascent(),
 873                                     text.maxwidth_, rit->height(),
 874                                     text.backgroundColor());
 875                                 // If outer row has changed, force nested
 876                                 // insets to repaint completely
 877                                 if (row_has_changed)
 878                                         refreshInside = true;
 879                         }
 880
 881                         // Instrumentation for testing row cache (see also
 882                         // 12 lines lower):
 883                         if (text.isMainText())
 884                                 lyxerr[Debug::PAINTING] << "#";
 885                         else
 886                                 lyxerr[Debug::PAINTING] << "[" <<
 887                                     repaintAll << row_has_changed <<
 888                                     cursor_on_row << "]";
 889                         rp.paintAppendix();
 890                         rp.paintDepthBar();
 891                         rp.paintChangeBar();
 892                         if (rit == rb)
 893                                 rp.paintFirst();
 894                         if (rit + 1 == re)
 895                                 rp.paintLast();
 896                         rp.paintText();
 897                 }
 898                 y += rit->descent();
 899                 // Restore, see above
 900                 refreshInside = tmp;
 901         }
 902         lyxerr[Debug::PAINTING] << "." << endl;
 903 }
 904
 905 } // namespace anon
 906
 907
 908 void paintText(BufferView & bv, ViewMetricsInfo const & vi,
 909                Painter & pain)
 910 {
 911         LyXText & text = bv.buffer()->text();
 912         bool const select = bv.cursor().selection();
 913
 914         PainterInfo pi(const_cast<BufferView *>(&bv), pain);
 915         // Should the whole screen, including insets, be refreshed?
 916         bool repaintAll = select || !vi.singlepar;
 917
 918         if (repaintAll) {
 919                 // Clear background (if not delegated to rows)
 920                 pain.fillRectangle(0, vi.y1, bv.workWidth(), vi.y2 - vi.y1,
 921                         text.backgroundColor());
 922         }
 923         if (select) {
 924                 text.drawSelection(pi, 0, 0);
 925         }
 926
 927         int yy = vi.y1;
 928         // draw contents
 929         for (pit_type pit = vi.p1; pit <= vi.p2; ++pit) {
 930                 refreshInside = repaintAll;
 931                 Paragraph const & par = text.getPar(pit);
 932                 yy += par.ascent();
 933                 paintPar(pi, text, pit, 0, yy, repaintAll);
 934                 yy += par.descent();
 935         }
 936
 937         // Cache one paragraph above and one below
 938         // Note MV: this cannot be suppressed even for singlepar.
 939         // Try viewing the User Guide Mobius figure
 940
 941         if (vi.p1 > 0) {
 942                 text.redoParagraph(vi.p1 - 1);
 943                 bv.coordCache().parPos()[&text][vi.p1 - 1] =
 944                         Point(0, vi.y1 - text.getPar(vi.p1 - 1).descent());
 945         }
 946
 947         if (vi.p2 < pit_type(text.paragraphs().size()) - 1) {
 948                 text.redoParagraph(vi.p2 + 1);
 949                 bv.coordCache().parPos()[&text][vi.p2 + 1] =
 950                         Point(0, vi.y2 + text.getPar(vi.p2 + 1).ascent());
 951         }
 952
 953         // and grey out above (should not happen later)
 954 //      lyxerr << "par ascent: " << text.getPar(vi.p1).ascent() << endl;
 955         if (vi.y1 > 0 && !vi.singlepar)
 956                 pain.fillRectangle(0, 0, bv.workWidth(), vi.y1, LColor::bottomarea);
 957
 958         // and possibly grey out below
 959 //      lyxerr << "par descent: " << text.getPar(vi.p1).ascent() << endl;
 960         if (vi.y2 < bv.workHeight() && !vi.singlepar)
 961                 pain.fillRectangle(0, vi.y2, bv.workWidth(), bv.workHeight() - vi.y2, LColor::bottomarea);
 962 }
 963
 964
 965 void paintTextInset(LyXText const & text, PainterInfo & pi, int x, int y)
 966 {
 967 //      lyxerr << "  paintTextInset: y: " << y << endl;
 968
 969         y -= text.getPar(0).ascent();
 970         // This flag can not be set from within same inset:
 971         bool repaintAll = refreshInside;
 972         for (int pit = 0; pit < int(text.paragraphs().size()); ++pit) {
 973                 y += text.getPar(pit).ascent();
 974                 paintPar(pi, text, pit, x, y, repaintAll);
 975                 y += text.getPar(pit).descent();
 976         }
 977 }
 978
 979
 980 } // namespace lyx