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 const & 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(*bv_.buffer(), 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(*bv_.buffer(), par_);
 150 }
 151
 152
 153 int RowPainter::leftMargin() const
 154 {
 155         return text_.leftMargin(*bv_.buffer(), 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(*bv_.buffer(), par_, i, c,
 207                                                 text_.getFont(*bv_.buffer(), par_, i));
 208                                 // FIXME UNICODE
 209                                 // This does not work anymore, and non-ascii
 210                                 // characters in source files are forbidden
 211                                 // anyway.
 212                                 // dalet / resh
 213                                 dx = (c == 'ø' || c == 'ã')
 214                                         ? width2 - width
 215                                         : (width2 - width) / 2;
 216                         }
 217                         break;
 218                 }
 219         }
 220
 221         // Draw nikud
 222         // FIXME UNICODE
 223         pain_.text(int(x_) + dx, yo_, str, font);
 224 }
 225
 226
 227 void RowPainter::paintArabicComposeChar(pos_type & vpos, LyXFont const & font)
 228 {
 229         pos_type pos = text_.bidi.vis2log(vpos);
 230         docstring str;
 231
 232         // first char
 233         char_type c = par_.getChar(pos);
 234         c = par_.transformChar(c, pos);
 235         str += c;
 236         ++vpos;
 237
 238         int const width = theFontMetrics(font).width(c);
 239         int dx = 0;
 240
 241         for (pos_type i = pos - 1; i >= 0; --i) {
 242                 c = par_.getChar(i);
 243                 if (!Encodings::isComposeChar_arabic(c)) {
 244                         if (isPrintableNonspace(c)) {
 245                                 int const width2 =
 246                                         text_.singleWidth(*bv_.buffer(), par_, i, c,
 247                                                 text_.getFont(*bv_.buffer(), par_, i));
 248                                 dx = (width2 - width) / 2;
 249                         }
 250                         break;
 251                 }
 252         }
 253         // Draw nikud
 254         pain_.text(int(x_) + dx, yo_, str, font);
 255 }
 256
 257 void RowPainter::paintChars(pos_type & vpos, LyXFont const & font,
 258                             bool hebrew, bool arabic)
 259 {
 260         // This method takes up 70% of time when typing
 261         pos_type pos = text_.bidi.vis2log(vpos);
 262         pos_type const end = row_.endpos();
 263         FontSpan const font_span = par_.fontSpan(pos);
 264         Change::Type const prev_change = par_.lookupChange(pos).type;
 265
 266         // first character
 267         std::vector<char_type> str;
 268         str.reserve(100);
 269         str.push_back(par_.getChar(pos));
 270
 271         if (arabic) {
 272                 char_type c = str[0];
 273                 str[0] = par_.transformChar(c, pos);
 274         }
 275
 276         // collect as much similar chars as we can
 277         for (++vpos ; vpos < end ; ++vpos) {
 278                 pos = text_.bidi.vis2log(vpos);
 279                 if (pos < font_span.first || pos > font_span.last)
 280                         break;
 281
 282                 if (prev_change != par_.lookupChange(pos).type)
 283                         break;
 284
 285                 char_type c = par_.getChar(pos);
 286
 287                 if (!isPrintableNonspace(c))
 288                         break;
 289
 290                 if (arabic && Encodings::isComposeChar_arabic(c))
 291                         break;
 292
 293                 if (hebrew && Encodings::isComposeChar_hebrew(c))
 294                         break;
 295
 296                 if (arabic)
 297                         c = par_.transformChar(c, pos);
 298
 299                 str.push_back(c);
 300         }
 301
 302         if (prev_change != Change::UNCHANGED) {
 303                 LyXFont copy(font);
 304                 if (prev_change == Change::DELETED) {
 305                         copy.setColor(LColor::strikeout);
 306                 } else if (prev_change == Change::INSERTED) {
 307                         copy.setColor(LColor::newtext);
 308                 }
 309                 x_ += pain_.text(int(x_), yo_, &str[0], str.size(), copy);
 310         } else {
 311                 x_ += pain_.text(int(x_), yo_, &str[0], str.size(), font);
 312         }
 313 }
 314
 315
 316 void RowPainter::paintForeignMark(double orig_x, LyXFont const & font, int desc)
 317 {
 318         if (!lyxrc.mark_foreign_language)
 319                 return;
 320         if (font.language() == latex_language)
 321                 return;
 322         if (font.language() == bv_.buffer()->params().language)
 323                 return;
 324
 325         int const y = yo_ + 1 + desc;
 326         pain_.line(int(orig_x), y, int(x_), y, LColor::language);
 327 }
 328
 329
 330 void RowPainter::paintFromPos(pos_type & vpos)
 331 {
 332         pos_type const pos = text_.bidi.vis2log(vpos);
 333         LyXFont orig_font = text_.getFont(*bv_.buffer(), par_, pos);
 334
 335         double const orig_x = x_;
 336
 337         if (par_.isInset(pos)) {
 338                 paintInset(pos, orig_font);
 339                 ++vpos;
 340                 paintForeignMark(orig_x, orig_font,
 341                         par_.getInset(pos)->descent());
 342                 return;
 343         }
 344
 345         // usual characters, no insets
 346         char_type const c = par_.getChar(pos);
 347
 348         // special case languages
 349         std::string const & lang = orig_font.language()->lang();
 350         bool const hebrew = lang == "hebrew";
 351         bool const arabic = lang == "arabic" &&
 352                 (lyxrc.font_norm_type == LyXRC::ISO_8859_6_8 ||
 353                 lyxrc.font_norm_type == LyXRC::ISO_10646_1);
 354
 355         // draw as many chars as we can
 356         if ((!hebrew && !arabic)
 357                 || (hebrew && !Encodings::isComposeChar_hebrew(c))
 358                 || (arabic && !Encodings::isComposeChar_arabic(c))) {
 359                 paintChars(vpos, orig_font, hebrew, arabic);
 360         } else if (hebrew) {
 361                 paintHebrewComposeChar(vpos, orig_font);
 362         } else if (arabic) {
 363                 paintArabicComposeChar(vpos, orig_font);
 364         }
 365
 366         paintForeignMark(orig_x, orig_font);
 367 }
 368
 369
 370 void RowPainter::paintChangeBar()
 371 {
 372         pos_type const start = row_.pos();
 373         pos_type const end = row_.endpos();
 374
 375         if (start == end || !par_.isChanged(start, end))
 376                 return;
 377
 378         int const height = text_.isLastRow(pit_, row_)
 379                 ? row_.ascent()
 380                 : row_.height();
 381
 382         pain_.fillRectangle(5, yo_ - row_.ascent(), 3, height, LColor::changebar);
 383 }
 384
 385
 386 void RowPainter::paintAppendix()
 387 {
 388         if (!par_.params().appendix())
 389                 return;
 390
 391         int y = yo_ - row_.ascent();
 392
 393         if (par_.params().startOfAppendix())
 394                 y += 2 * defaultRowHeight();
 395
 396         pain_.line(1, y, 1, yo_ + row_.height(), LColor::appendix);
 397         pain_.line(width_ - 2, y, width_ - 2, yo_ + row_.height(), LColor::appendix);
 398 }
 399
 400
 401 void RowPainter::paintDepthBar()
 402 {
 403         depth_type const depth = par_.getDepth();
 404
 405         if (depth <= 0)
 406                 return;
 407
 408         depth_type prev_depth = 0;
 409         if (!text_.isFirstRow(pit_, row_)) {
 410                 pit_type pit2 = pit_;
 411                 if (row_.pos() == 0)
 412                         --pit2;
 413                 prev_depth = pars_[pit2].getDepth();
 414         }
 415
 416         depth_type next_depth = 0;
 417         if (!text_.isLastRow(pit_, row_)) {
 418                 pit_type pit2 = pit_;
 419                 if (row_.endpos() >= pars_[pit2].size())
 420                         ++pit2;
 421                 next_depth = pars_[pit2].getDepth();
 422         }
 423
 424         for (depth_type i = 1; i <= depth; ++i) {
 425                 int const w = nestMargin() / 5;
 426                 int x = int(xo_) + w * i;
 427                 // only consider the changebar space if we're drawing outermost text
 428                 if (text_.isMainText(*bv_.buffer()))
 429                         x += changebarMargin();
 430
 431                 int const starty = yo_ - row_.ascent();
 432                 int const h =  row_.height() - 1 - (i - next_depth - 1) * 3;
 433
 434                 pain_.line(x, starty, x, starty + h, LColor::depthbar);
 435
 436                 if (i > prev_depth)
 437                         pain_.fillRectangle(x, starty, w, 2, LColor::depthbar);
 438                 if (i > next_depth)
 439                         pain_.fillRectangle(x, starty + h, w, 2, LColor::depthbar);
 440         }
 441 }
 442
 443
 444 int RowPainter::paintAppendixStart(int y)
 445 {
 446         LyXFont pb_font;
 447         pb_font.setColor(LColor::appendix);
 448         pb_font.decSize();
 449
 450         int w = 0;
 451         int a = 0;
 452         int d = 0;
 453
 454         docstring const label = _("Appendix");
 455         theFontMetrics(pb_font).rectText(label, w, a, d);
 456
 457         int const text_start = int(xo_ + (width_ - w) / 2);
 458         int const text_end = text_start + w;
 459
 460         pain_.rectText(text_start, y + d, label, pb_font, LColor::none, LColor::none);
 461
 462         pain_.line(int(xo_ + 1), y, text_start, y, LColor::appendix);
 463         pain_.line(text_end, y, int(xo_ + width_ - 2), y, LColor::appendix);
 464
 465         return 3 * defaultRowHeight();
 466 }
 467
 468
 469 void RowPainter::paintFirst()
 470 {
 471         ParagraphParameters const & parparams = par_.params();
 472
 473         int y_top = 0;
 474
 475         // start of appendix?
 476         if (parparams.startOfAppendix())
 477                 y_top += paintAppendixStart(yo_ - row_.ascent() + 2 * defaultRowHeight());
 478
 479         Buffer const & buffer = *bv_.buffer();
 480
 481         LyXLayout_ptr const & layout = par_.layout();
 482
 483         if (buffer.params().paragraph_separation == BufferParams::PARSEP_SKIP) {
 484                 if (pit_ != 0) {
 485                         if (layout->latextype == LATEX_PARAGRAPH
 486                                 && !par_.getDepth()) {
 487                                 y_top += buffer.params().getDefSkip().inPixels(bv_);
 488                         } else {
 489                                 LyXLayout_ptr const & playout = pars_[pit_ - 1].layout();
 490                                 if (playout->latextype == LATEX_PARAGRAPH
 491                                         && !pars_[pit_ - 1].getDepth()) {
 492                                         // is it right to use defskip here, too? (AS)
 493                                         y_top += buffer.params().getDefSkip().inPixels(bv_);
 494                                 }
 495                         }
 496                 }
 497         }
 498
 499         bool const is_rtl = text_.isRTL(buffer, par_);
 500         bool const is_seq = isFirstInSequence(pit_, text_.paragraphs());
 501         //lyxerr << "paintFirst: " << par_.id() << " is_seq: " << is_seq << std::endl;
 502
 503         // should we print a label?
 504         if (layout->labeltype >= LABEL_STATIC
 505             && (layout->labeltype != LABEL_STATIC
 506                       || layout->latextype != LATEX_ENVIRONMENT
 507                       || is_seq)) {
 508
 509                 LyXFont const font = getLabelFont();
 510                 FontMetrics const & fm = theFontMetrics(font);
 511
 512                 docstring const str = par_.getLabelstring();
 513                 if (!str.empty()) {
 514                         double x = x_;
 515
 516                         // this is special code for the chapter layout. This is
 517                         // printed in an extra row and has a pagebreak at
 518                         // the top.
 519                         if (layout->counter == "chapter") {
 520                                 double spacing_val = 1.0;
 521                                 if (!parparams.spacing().isDefault()) {
 522                                         spacing_val = parparams.spacing().getValue();
 523                                 } else {
 524                                         spacing_val = buffer.params().spacing().getValue();
 525                                 }
 526
 527                                 int const labeladdon = int(fm.maxHeight() * layout->spacing.getValue() * spacing_val);
 528
 529                                 int const maxdesc = int(fm.maxDescent() * layout->spacing.getValue() * spacing_val)
 530                                         + int(layout->parsep) * defaultRowHeight();
 531
 532                                 if (is_rtl) {
 533                                         x = width_ - leftMargin() -
 534                                                 fm.width(str);
 535                                 }
 536
 537                                 pain_.text(int(x), yo_ - maxdesc - labeladdon, str, font);
 538                         } else {
 539                                 // FIXME UNICODE
 540                                 docstring lab = from_utf8(layout->labelsep);
 541                                 if (is_rtl) {
 542                                         x = width_ - leftMargin()
 543                                                 + fm.width(lab);
 544                                 } else {
 545                                         x = x_ - fm.width(lab)
 546                                                 - fm.width(str);
 547                                 }
 548
 549                                 pain_.text(int(x), yo_, str, font);
 550                         }
 551                 }
 552
 553         // the labels at the top of an environment.
 554         // More or less for bibliography
 555         } else if (is_seq &&
 556                 (layout->labeltype == LABEL_TOP_ENVIRONMENT ||
 557                 layout->labeltype == LABEL_BIBLIO ||
 558                 layout->labeltype == LABEL_CENTERED_TOP_ENVIRONMENT)) {
 559                 LyXFont font = getLabelFont();
 560                 if (!par_.getLabelstring().empty()) {
 561                         docstring const str = par_.getLabelstring();
 562                         double spacing_val = 1.0;
 563                         if (!parparams.spacing().isDefault())
 564                                 spacing_val = parparams.spacing().getValue();
 565                         else
 566                                 spacing_val = buffer.params().spacing().getValue();
 567
 568                         FontMetrics const & fm = theFontMetrics(font);
 569
 570                         int const labeladdon = int(fm.maxHeight()
 571                                 * layout->spacing.getValue() * spacing_val);
 572
 573                         int maxdesc =
 574                                 int(fm.maxDescent() * layout->spacing.getValue() * spacing_val
 575                                 + (layout->labelbottomsep * defaultRowHeight()));
 576
 577                         double x = x_;
 578                         if (layout->labeltype == LABEL_CENTERED_TOP_ENVIRONMENT) {
 579                                 if (is_rtl)
 580                                         x = leftMargin();
 581                                 x += (width_ - text_.rightMargin(buffer, par_) - leftMargin()) / 2;
 582                                 x -= fm.width(str) / 2;
 583                         } else if (is_rtl) {
 584                                 x = width_ - leftMargin() -     fm.width(str);
 585                         }
 586                         pain_.text(int(x), yo_ - maxdesc - labeladdon, str, font);
 587                 }
 588         }
 589 }
 590
 591
 592 void RowPainter::paintLast()
 593 {
 594         bool const is_rtl = text_.isRTL(*bv_.buffer(), par_);
 595         int const endlabel = getEndLabel(pit_, text_.paragraphs());
 596
 597         // draw an endlabel
 598         switch (endlabel) {
 599         case END_LABEL_BOX:
 600         case END_LABEL_FILLED_BOX: {
 601                 LyXFont const font = getLabelFont();
 602                 FontMetrics const & fm = theFontMetrics(font);
 603                 int const size = int(0.75 * fm.maxAscent());
 604                 int const y = yo_ - size;
 605                 int x = is_rtl ? nestMargin() + changebarMargin() : width_ - size;
 606
 607                 if (width_ - int(row_.width()) <= size)
 608                         x += (size - width_ + row_.width() + 1) * (is_rtl ? -1 : 1);
 609
 610                 if (endlabel == END_LABEL_BOX)
 611                         pain_.rectangle(x, y, size, size, LColor::eolmarker);
 612                 else
 613                         pain_.fillRectangle(x, y, size, size, LColor::eolmarker);
 614                 break;
 615         }
 616
 617         case END_LABEL_STATIC: {
 618                 LyXFont font = getLabelFont();
 619                 FontMetrics const & fm = theFontMetrics(font);
 620                 docstring const & str = par_.layout()->endlabelstring();
 621                 double const x = is_rtl ?
 622                         x_ - fm.width(str)
 623                         : - text_.rightMargin(*bv_.buffer(), par_) - row_.width();
 624                 pain_.text(int(x), yo_, str, font);
 625                 break;
 626         }
 627
 628         case END_LABEL_NO_LABEL:
 629                 break;
 630         }
 631 }
 632
 633
 634 void RowPainter::paintText()
 635 {
 636         pos_type const end = row_.endpos();
 637         pos_type body_pos = par_.beginOfBody();
 638         if (body_pos > 0 &&
 639                 (body_pos > end || !par_.isLineSeparator(body_pos - 1))) {
 640                 body_pos = 0;
 641         }
 642
 643         LyXLayout_ptr const & layout = par_.layout();
 644
 645         bool running_strikeout = false;
 646         bool is_struckout = false;
 647         int last_strikeout_x = 0;
 648
 649         // Use font span to speed things up, see below
 650         FontSpan font_span;
 651         LyXFont font;
 652         Buffer const & buffer = *bv_.buffer();
 653
 654         for (pos_type vpos = row_.pos(); vpos < end; ) {
 655                 if (x_ > bv_.workWidth())
 656                         break;
 657
 658                 pos_type const pos = text_.bidi.vis2log(vpos);
 659
 660                 if (pos >= par_.size()) {
 661                         ++vpos;
 662                         continue;
 663                 }
 664
 665                 // Use font span to speed things up, see above
 666                 if (vpos < font_span.first || vpos > font_span.last) {
 667                         font_span = par_.fontSpan(vpos);
 668                         font = text_.getFont(buffer, par_, vpos);
 669                 }
 670
 671                 const int width_pos = text_.singleWidth(buffer, par_, pos,
 672                         par_.getChar(pos), font);
 673
 674                 if (x_ + width_pos < 0) {
 675                         x_ += width_pos;
 676                         ++vpos;
 677                         continue;
 678                 }
 679
 680                 is_struckout = par_.isDeleted(pos);
 681
 682                 if (is_struckout && !running_strikeout) {
 683                         running_strikeout = true;
 684                         last_strikeout_x = int(x_);
 685                 }
 686
 687                 bool const highly_editable_inset = par_.isInset(pos)
 688                         && isHighlyEditableInset(par_.getInset(pos));
 689
 690                 // If we reach the end of a struck out range, paint it.
 691                 // We also don't paint across things like tables
 692                 if (running_strikeout && (highly_editable_inset || !is_struckout)) {
 693                         // Calculate 1/3 height of the buffer's default font
 694                         FontMetrics const & fm
 695                                 = theFontMetrics(bv_.buffer()->params().getFont());
 696                         int const middle = yo_ - fm.maxAscent() / 3;
 697                         pain_.line(last_strikeout_x, middle, int(x_), middle,
 698                                 LColor::strikeout, Painter::line_solid, Painter::line_thin);
 699                         running_strikeout = false;
 700                 }
 701
 702                 if (body_pos > 0 && pos == body_pos - 1) {
 703                         // FIXME UNICODE
 704                         int const lwidth = theFontMetrics(getLabelFont())
 705                                 .width(from_utf8(layout->labelsep));
 706
 707                         x_ += label_hfill_ + lwidth - width_pos;
 708                 }
 709
 710                 if (par_.isHfill(pos)) {
 711                         x_ += 1;
 712
 713                         int const y0 = yo_;
 714                         int const y1 = y0 - defaultRowHeight() / 2;
 715
 716                         pain_.line(int(x_), y1, int(x_), y0, LColor::added_space);
 717
 718                         if (par_.hfillExpansion(row_, pos)) {
 719                                 int const y2 = (y0 + y1) / 2;
 720
 721                                 if (pos >= body_pos) {
 722                                         pain_.line(int(x_), y2, int(x_ + hfill_), y2,
 723                                                   LColor::added_space,
 724                                                   Painter::line_onoffdash);
 725                                         x_ += hfill_;
 726                                 } else {
 727                                         pain_.line(int(x_), y2, int(x_ + label_hfill_), y2,
 728                                                   LColor::added_space,
 729                                                   Painter::line_onoffdash);
 730                                         x_ += label_hfill_;
 731                                 }
 732                                 pain_.line(int(x_), y1, int(x_), y0, LColor::added_space);
 733                         }
 734                         x_ += 2;
 735                         ++vpos;
 736                 } else if (par_.isSeparator(pos)) {
 737                         x_ += width_pos;
 738                         if (pos >= body_pos)
 739                                 x_ += separator_;
 740                         ++vpos;
 741                 } else {
 742                         paintFromPos(vpos);
 743                 }
 744         }
 745
 746         // if we reach the end of a struck out range, paint it
 747         if (running_strikeout) {
 748                 // calculate 1/3 height of the buffer's default font
 749                 FontMetrics const & fm
 750                         = theFontMetrics(bv_.buffer()->params().getFont());
 751                 int const middle = yo_ - fm.maxAscent() / 3;
 752                 pain_.line(last_strikeout_x, middle, int(x_), middle,
 753                         LColor::strikeout, Painter::line_solid, Painter::line_thin);
 754                 running_strikeout = false;
 755         }
 756 }
 757
 758
 759 size_type calculateRowSignature(Row const & row, Paragraph const & par,
 760         int x, int y)
 761 {
 762         boost::crc_32_type crc;
 763         for (pos_type i = row.pos(); i < row.endpos(); ++i) {
 764                 char_type const b[] = { par.getChar(i) };
 765                 crc.process_bytes(b, 1);
 766         }
 767         char_type const b[] = { x, y, row.width() };
 768         crc.process_bytes(b, 3);
 769         return crc.checksum();
 770 }
 771
 772
 773 bool CursorOnRow(PainterInfo & pi, pit_type const pit,
 774         RowList::const_iterator rit, LyXText const & text)
 775 {
 776         // Is there a cursor on this row (or inside inset on row)
 777         LCursor & cur = pi.base.bv->cursor();
 778         for (size_type d = 0; d < cur.depth(); ++d) {
 779                 CursorSlice const & sl = cur[d];
 780                 if (sl.text() == &text
 781                     && sl.pit() == pit
 782                     && sl.pos() >= rit->pos()
 783                     && sl.pos() <= rit->endpos())
 784                         return true;
 785         }
 786         return false;
 787 }
 788
 789
 790 bool innerCursorOnRow(PainterInfo & pi, pit_type pit,
 791         RowList::const_iterator rit, LyXText const & text)
 792 {
 793         // Is there a cursor inside an inset on this row, and is this inset
 794         // the only "character" on this row
 795         LCursor & cur = pi.base.bv->cursor();
 796         if (rit->pos() + 1 != rit->endpos())
 797                 return false;
 798         for (size_type d = 0; d < cur.depth(); d++) {
 799                 CursorSlice const & sl = cur[d];
 800                 if (sl.text() == &text
 801                     && sl.pit() == pit
 802                     && sl.pos() == rit->pos())
 803                         return d < cur.depth() - 1;
 804         }
 805         return false;
 806 }
 807
 808
 809 void paintPar
 810         (PainterInfo & pi, LyXText const & text, pit_type pit, int x, int y,
 811          bool repaintAll)
 812 {
 813 //      lyxerr << "  paintPar: pit: " << pit << " at y: " << y << endl;
 814         int const ww = pi.base.bv->workHeight();
 815
 816         pi.base.bv->coordCache().parPos()[&text][pit] = Point(x, y);
 817
 818         Paragraph const & par = text.paragraphs()[pit];
 819         if (par.rows().empty())
 820                 return;
 821
 822         RowList::const_iterator const rb = par.rows().begin();
 823         RowList::const_iterator const re = par.rows().end();
 824
 825         y -= rb->ascent();
 826         size_type rowno = 0;
 827         for (RowList::const_iterator rit = rb; rit != re; ++rit, ++rowno) {
 828                 y += rit->ascent();
 829                 // Allow setting of refreshInside for nested insets in
 830                 // this row only
 831                 bool tmp = refreshInside;
 832
 833                 // Row signature; has row changed since last paint?
 834                 size_type const row_sig = calculateRowSignature(*rit, par, x, y);
 835                 bool row_has_changed = par.rowSignature()[rowno] != row_sig;
 836
 837                 bool cursor_on_row = CursorOnRow(pi, pit, rit, text);
 838                 bool in_inset_alone_on_row = innerCursorOnRow(pi, pit, rit,
 839                         text);
 840
 841                 // If this is the only object on the row, we can make it wide
 842                 for (pos_type i = rit->pos() ; i != rit->endpos(); ++i) {
 843                         InsetBase const * const in = par.getInset(i);
 844                         if (in) {
 845                                 InsetText const * const t = in->asTextInset();
 846                                 if (t)
 847                                         t->Wide() = in_inset_alone_on_row;
 848                         }
 849                 }
 850
 851                 // If selection is on, the current row signature differs
 852                 // from cache, or cursor is inside an inset _on this row_,
 853                 // then paint the row
 854                 if (repaintAll || row_has_changed || cursor_on_row) {
 855                         // Add to row signature cache
 856                         par.rowSignature()[rowno] = row_sig;
 857
 858                         bool const inside = (y + rit->descent() >= 0
 859                                 && y - rit->ascent() < ww);
 860                         // it is not needed to draw on screen if we are not inside.
 861                         pi.pain.setDrawingEnabled(inside);
 862                         RowPainter rp(pi, text, pit, *rit, x, y);
 863                         // Clear background of this row
 864                         // (if paragraph background was not cleared)
 865                         if (!repaintAll &&
 866                             (!in_inset_alone_on_row || row_has_changed)) {
 867                                 pi.pain.fillRectangle(x, y - rit->ascent(),
 868                                     text.maxwidth_, rit->height(),
 869                                     text.backgroundColor());
 870                                 // If outer row has changed, force nested
 871                                 // insets to repaint completely
 872                                 if (row_has_changed)
 873                                         refreshInside = true;
 874                         }
 875
 876                         // Instrumentation for testing row cache (see also
 877                         // 12 lines lower):
 878                         if (text.isMainText(*pi.base.bv->buffer()))
 879                                 lyxerr[Debug::PAINTING] << "#";
 880                         else
 881                                 lyxerr[Debug::PAINTING] << "[" <<
 882                                     repaintAll << row_has_changed <<
 883                                     cursor_on_row << "]";
 884                         rp.paintAppendix();
 885                         rp.paintDepthBar();
 886                         rp.paintChangeBar();
 887                         if (rit == rb)
 888                                 rp.paintFirst();
 889                         if (rit + 1 == re)
 890                                 rp.paintLast();
 891                         rp.paintText();
 892                 }
 893                 y += rit->descent();
 894                 // Restore, see above
 895                 refreshInside = tmp;
 896         }
 897         // Re-enable screen drawing for future use of the painter.
 898         pi.pain.setDrawingEnabled(true);
 899
 900         lyxerr[Debug::PAINTING] << "." << endl;
 901 }
 902
 903 } // namespace anon
 904
 905
 906 void paintText(BufferView & bv,
 907                Painter & pain)
 908 {
 909         BOOST_ASSERT(bv.buffer());
 910         Buffer const & buffer = *bv.buffer();
 911         LyXText & text = buffer.text();
 912         bool const select = bv.cursor().selection();
 913         ViewMetricsInfo const & vi = bv.viewMetricsInfo();
 914
 915         PainterInfo pi(const_cast<BufferView *>(&bv), pain);
 916         // Should the whole screen, including insets, be refreshed?
 917         bool repaintAll = select || !vi.singlepar;
 918
 919         if (repaintAll) {
 920                 // Clear background (if not delegated to rows)
 921                 pain.fillRectangle(0, vi.y1, bv.workWidth(), vi.y2 - vi.y1,
 922                         text.backgroundColor());
 923         }
 924         if (select) {
 925                 text.drawSelection(pi, 0, 0);
 926         }
 927
 928         int yy = vi.y1;
 929         // draw contents
 930         for (pit_type pit = vi.p1; pit <= vi.p2; ++pit) {
 931                 refreshInside = repaintAll;
 932                 Paragraph const & par = text.getPar(pit);
 933                 yy += par.ascent();
 934                 paintPar(pi, text, pit, 0, yy, repaintAll);
 935                 yy += par.descent();
 936         }
 937
 938         // Cache one paragraph above and one below
 939         // Note MV: this cannot be suppressed even for singlepar.
 940         // Try viewing the User Guide Mobius figure
 941
 942         if (vi.p1 > 0) {
 943                 text.redoParagraph(bv, vi.p1 - 1);
 944                 bv.coordCache().parPos()[&text][vi.p1 - 1] =
 945                         Point(0, vi.y1 - text.getPar(vi.p1 - 1).descent());
 946         }
 947
 948         if (vi.p2 < pit_type(text.paragraphs().size()) - 1) {
 949                 text.redoParagraph(bv, vi.p2 + 1);
 950                 bv.coordCache().parPos()[&text][vi.p2 + 1] =
 951                         Point(0, vi.y2 + text.getPar(vi.p2 + 1).ascent());
 952         }
 953
 954         // and grey out above (should not happen later)
 955 //      lyxerr << "par ascent: " << text.getPar(vi.p1).ascent() << endl;
 956         if (vi.y1 > 0 && !vi.singlepar)
 957                 pain.fillRectangle(0, 0, bv.workWidth(), vi.y1, LColor::bottomarea);
 958
 959         // and possibly grey out below
 960 //      lyxerr << "par descent: " << text.getPar(vi.p1).ascent() << endl;
 961         if (vi.y2 < bv.workHeight() && !vi.singlepar)
 962                 pain.fillRectangle(0, vi.y2, bv.workWidth(), bv.workHeight() - vi.y2, LColor::bottomarea);
 963 }
 964
 965
 966 void paintTextInset(LyXText const & text, PainterInfo & pi, int x, int y)
 967 {
 968 //      lyxerr << "  paintTextInset: y: " << y << endl;
 969
 970         y -= text.getPar(0).ascent();
 971         // This flag can not be set from within same inset:
 972         bool repaintAll = refreshInside;
 973         for (int pit = 0; pit < int(text.paragraphs().size()); ++pit) {
 974                 y += text.getPar(pit).ascent();
 975                 paintPar(pi, text, pit, x, y, repaintAll);
 976                 y += text.getPar(pit).descent();
 977         }
 978 }
 979
 980
 981 } // namespace lyx