src/BufferView.cpp

   1 /**
   2  * \file BufferView.cpp
   3  * This file is part of LyX, the document processor.
   4  * Licence details can be found in the file COPYING.
   5  *
   6  * \author Alfredo Braunstein
   7  * \author Lars Gullik Bjønnes
   8  * \author John Levon
   9  * \author André Pönitz
  10  * \author Jürgen Vigna
  11  *
  12  * Full author contact details are available in file CREDITS.
  13  */
  14
  15 #include <config.h>
  16
  17 #include "BufferView.h"
  18
  19 #include "BranchList.h"
  20 #include "Buffer.h"
  21 #include "BufferList.h"
  22 #include "BufferParams.h"
  23 #include "CoordCache.h"
  24 #include "Cursor.h"
  25 #include "CutAndPaste.h"
  26 #include "DispatchResult.h"
  27 #include "ErrorList.h"
  28 #include "FuncRequest.h"
  29 #include "FuncStatus.h"
  30 #include "Intl.h"
  31 #include "Language.h"
  32 #include "LayoutFile.h"
  33 #include "Lexer.h"
  34 #include "LyX.h"
  35 #include "LyXAction.h"
  36 #include "lyxfind.h"
  37 #include "LyXRC.h"
  38 #include "MetricsInfo.h"
  39 #include "Paragraph.h"
  40 #include "Session.h"
  41 #include "Text.h"
  42 #include "TextMetrics.h"
  43 #include "TexRow.h"
  44 #include "TocBackend.h"
  45
  46 #include "insets/InsetBibtex.h"
  47 #include "insets/InsetCitation.h"
  48 #include "insets/InsetCommand.h" // ChangeRefs
  49 #include "insets/InsetGraphics.h"
  50 #include "insets/InsetRef.h"
  51 #include "insets/InsetText.h"
  52
  53 #include "mathed/InsetMathNest.h"
  54 #include "mathed/InsetMathRef.h"
  55 #include "mathed/MathData.h"
  56 #include "mathed/MathRow.h"
  57
  58 #include "frontends/alert.h"
  59 #include "frontends/CaretGeometry.h"
  60 #include "frontends/Delegates.h"
  61 #include "frontends/FontMetrics.h"
  62 #include "frontends/NullPainter.h"
  63 #include "frontends/Painter.h"
  64 #include "frontends/Selection.h"
  65 #include "frontends/Clipboard.h"
  66
  67 #include "support/convert.h"
  68 #include "support/debug.h"
  69 #include "support/docstring.h"
  70 #include "support/filetools.h"
  71 #include "support/gettext.h"
  72 #include "support/lassert.h"
  73 #include "support/Length.h"
  74 #include "support/lstrings.h"
  75 #include "support/lyxlib.h"
  76 #include "support/types.h"
  77
  78 #include <algorithm>
  79 #include <cerrno>
  80 #include <cstring>
  81 #include <fstream>
  82 #include <functional>
  83 #include <iterator>
  84 #include <sstream>
  85 #include <vector>
  86
  87 using namespace std;
  88 using namespace lyx::support;
  89
  90 namespace lyx {
  91
  92 namespace Alert = frontend::Alert;
  93
  94 namespace {
  95
  96 /// Return an inset of this class if it exists at the current cursor position
  97 template <class T>
  98 T * getInsetByCode(Cursor const & cur, InsetCode code)
  99 {
 100         DocIterator it = cur;
 101         Inset * inset = it.nextInset();
 102         if (inset && inset->lyxCode() == code)
 103                 return static_cast<T*>(inset);
 104         return nullptr;
 105 }
 106
 107
 108 /// Note that comparing contents can only be used for InsetCommand
 109 bool findNextInset(DocIterator & dit, vector<InsetCode> const & codes,
 110         docstring const & contents)
 111 {
 112         DocIterator tmpdit = dit;
 113
 114         while (tmpdit) {
 115                 Inset const * inset = tmpdit.nextInset();
 116                 if (inset) {
 117                         bool const valid_code = std::find(codes.begin(), codes.end(),
 118                                 inset->lyxCode()) != codes.end();
 119                         InsetCommand const * ic = inset->asInsetCommand();
 120                         bool const same_or_no_contents =  contents.empty()
 121                                 || (ic && (ic->getFirstNonOptParam() == contents));
 122
 123                         if (valid_code && same_or_no_contents) {
 124                                 dit = tmpdit;
 125                                 return true;
 126                         }
 127                 }
 128                 tmpdit.forwardInset();
 129         }
 130
 131         return false;
 132 }
 133
 134
 135 /// Looks for next inset with one of the given codes.
 136 /// Note that same_content can only be used for InsetCommand
 137 bool findInset(DocIterator & dit, vector<InsetCode> const & codes,
 138         bool same_content)
 139 {
 140         docstring contents;
 141         DocIterator tmpdit = dit;
 142         tmpdit.forwardInset();
 143         if (!tmpdit)
 144                 return false;
 145
 146         Inset const * inset = tmpdit.nextInset();
 147         if (same_content && inset) {
 148                 InsetCommand const * ic = inset->asInsetCommand();
 149                 if (ic) {
 150                         bool const valid_code = std::find(codes.begin(), codes.end(),
 151                                 ic->lyxCode()) != codes.end();
 152                         if (valid_code)
 153                                 contents = ic->getFirstNonOptParam();
 154                 }
 155         }
 156
 157         if (!findNextInset(tmpdit, codes, contents)) {
 158                 if (dit.depth() != 1 || dit.pit() != 0 || dit.pos() != 0) {
 159                         inset = &tmpdit.bottom().inset();
 160                         tmpdit = doc_iterator_begin(&inset->buffer(), inset);
 161                         if (!findNextInset(tmpdit, codes, contents))
 162                                 return false;
 163                 } else {
 164                         return false;
 165                 }
 166         }
 167
 168         dit = tmpdit;
 169         return true;
 170 }
 171
 172
 173 /// Moves cursor to the next inset with one of the given codes.
 174 void gotoInset(BufferView * bv, vector<InsetCode> const & codes,
 175                bool same_content)
 176 {
 177         Cursor tmpcur = bv->cursor();
 178         if (!findInset(tmpcur, codes, same_content)) {
 179                 bv->cursor().message(_("No more insets"));
 180                 return;
 181         }
 182
 183         tmpcur.clearSelection();
 184         bv->setCursor(tmpcur);
 185         bv->showCursor();
 186 }
 187
 188
 189 /// A map from a Text to the associated text metrics
 190 typedef map<Text const *, TextMetrics> TextMetricsCache;
 191
 192 enum ScreenUpdateStrategy {
 193         NoScreenUpdate,
 194         SingleParUpdate,
 195         FullScreenUpdate,
 196         DecorationUpdate
 197 };
 198
 199 } // namespace
 200
 201
 202 /////////////////////////////////////////////////////////////////////
 203 //
 204 // BufferView
 205 //
 206 /////////////////////////////////////////////////////////////////////
 207
 208 struct BufferView::Private
 209 {
 210         Private(BufferView & bv) :
 211                 update_strategy_(FullScreenUpdate),
 212                 update_flags_(Update::Force),
 213                 cursor_(bv), anchor_pit_(0), anchor_ypos_(0),
 214                 wh_(0), inlineCompletionUniqueChars_(0),
 215                 last_inset_(nullptr), mouse_position_cache_(),
 216                 gui_(nullptr), bookmark_edit_position_(-1),
 217                 horiz_scroll_offset_(0), clickable_inset_(false)
 218         {
 219                 xsel_cache_.set = false;
 220         }
 221
 222         ///
 223         ScrollbarParameters scrollbarParameters_;
 224         ///
 225         ScreenUpdateStrategy update_strategy_;
 226         ///
 227         Update::flags update_flags_;
 228         ///
 229         CoordCache coord_cache_;
 230         ///
 231         typedef map<MathData const *, MathRow> MathRows;
 232         MathRows math_rows_;
 233
 234         /// this is used to handle XSelection events in the right manner.
 235         struct {
 236                 CursorSlice cursor;
 237                 CursorSlice anchor;
 238                 bool set;
 239         } xsel_cache_;
 240         ///
 241         Cursor cursor_;
 242         ///
 243         pit_type anchor_pit_;
 244         ///
 245         int anchor_ypos_;
 246         /// Estimated average par height for scrollbar.
 247         int wh_;
 248         ///
 249         vector<int> par_height_;
 250
 251         ///
 252         DocIterator inlineCompletionPos_;
 253         ///
 254         docstring inlineCompletion_;
 255         ///
 256         size_t inlineCompletionUniqueChars_;
 257
 258         /// keyboard mapping object.
 259         Intl intl_;
 260
 261         /// last visited inset.
 262         /** kept to send setMouseHover(false).
 263           * Not owned, so don't delete.
 264           */
 265         Inset const * last_inset_;
 266
 267         /// position of the mouse at the time of the last mouse move
 268         /// This is used to update the hovering status of inset in
 269         /// cases where the buffer is scrolled, but the mouse didn't move.
 270         Point mouse_position_cache_;
 271
 272         mutable TextMetricsCache text_metrics_;
 273
 274         /// Whom to notify.
 275         /** Not owned, so don't delete.
 276           */
 277         frontend::GuiBufferViewDelegate * gui_;
 278
 279         ///
 280         map<string, Inset *> edited_insets_;
 281
 282         /// When the row where the cursor lies is scrolled, this
 283         /// contains the scroll offset
 284         // cache for id of the paragraph which was edited the last time
 285         int bookmark_edit_position_;
 286
 287         int horiz_scroll_offset_;
 288         /// a slice pointing to the start of the row where the cursor
 289         /// is (at last draw time)
 290         CursorSlice current_row_slice_;
 291         /// are we hovering something that we can click
 292         bool clickable_inset_;
 293         /// shape of the caret
 294         frontend::CaretGeometry caret_geometry_;
 295 };
 296
 297
 298 BufferView::BufferView(Buffer & buf)
 299         : width_(0), height_(0), full_screen_(false), buffer_(buf),
 300       d(new Private(*this))
 301 {
 302         d->xsel_cache_.set = false;
 303         d->intl_.initKeyMapper(lyxrc.use_kbmap);
 304
 305         d->cursor_.setBuffer(&buf);
 306         d->cursor_.push(buffer_.inset());
 307         d->cursor_.resetAnchor();
 308         d->cursor_.setCurrentFont();
 309
 310         buffer_.updatePreviews();
 311 }
 312
 313
 314 BufferView::~BufferView()
 315 {
 316         // current buffer is going to be switched-off, save cursor pos
 317         // Ideally, the whole cursor stack should be saved, but session
 318         // currently can only handle bottom (whole document) level pit and pos.
 319         // That is to say, if a cursor is in a nested inset, it will be
 320         // restore to the left of the top level inset.
 321         LastFilePosSection::FilePos fp;
 322         fp.file = buffer_.fileName();
 323         fp.pit = d->cursor_.bottom().pit();
 324         fp.pos = d->cursor_.bottom().pos();
 325         theSession().lastFilePos().save(fp);
 326
 327         if (d->last_inset_)
 328                 d->last_inset_->setMouseHover(this, false);
 329
 330         delete d;
 331 }
 332
 333
 334 int BufferView::rightMargin() const
 335 {
 336         // The value used to be hardcoded to 10
 337         int const default_margin = zoomedPixels(10);
 338         // The additional test for the case the outliner is opened.
 339         if (!full_screen_ || !lyxrc.full_screen_limit
 340             || width_ < lyxrc.full_screen_width + 2 * default_margin)
 341                 return default_margin;
 342
 343         return (width_ - lyxrc.full_screen_width) / 2;
 344 }
 345
 346
 347 int BufferView::leftMargin() const
 348 {
 349         return rightMargin();
 350 }
 351
 352
 353 int BufferView::topMargin() const
 354 {
 355         // Original value was 20px at 100dpi. For internal buffers like in
 356         // advanced search and replace, a value of 5px is enough.
 357         return zoomedPixels(buffer().isInternal() ? 5 : 20);
 358 }
 359
 360
 361 int BufferView::bottomMargin() const
 362 {
 363         return topMargin();
 364 }
 365
 366
 367 int BufferView::inPixels(Length const & len) const
 368 {
 369         Font const font = buffer().params().getFont();
 370         return len.inPixels(workWidth(), theFontMetrics(font).em());
 371 }
 372
 373
 374 int BufferView::zoomedPixels(int pix) const
 375 {
 376         // FIXME: the dpi setting should really depend on the BufferView
 377         // (think different monitors).
 378
 379         // Zoom factor specified by user in percent
 380         double const zoom = lyxrc.currentZoom / 100.0; // [percent]
 381
 382         // DPI setting for monitor relative to 100dpi
 383         double const dpizoom = lyxrc.dpi / 100.0; // [per 100dpi]
 384
 385         return support::iround(pix * zoom * dpizoom);
 386 }
 387
 388
 389 bool BufferView::isTopScreen() const
 390 {
 391         return 0 == d->scrollbarParameters_.min;
 392 }
 393
 394
 395 bool BufferView::isBottomScreen() const
 396 {
 397         return 0 == d->scrollbarParameters_.max;
 398 }
 399
 400
 401 Intl & BufferView::getIntl()
 402 {
 403         return d->intl_;
 404 }
 405
 406
 407 Intl const & BufferView::getIntl() const
 408 {
 409         return d->intl_;
 410 }
 411
 412
 413 CoordCache & BufferView::coordCache()
 414 {
 415         return d->coord_cache_;
 416 }
 417
 418
 419 CoordCache const & BufferView::coordCache() const
 420 {
 421         return d->coord_cache_;
 422 }
 423
 424
 425 MathRow const & BufferView::mathRow(MathData const * cell) const
 426 {
 427         auto it = d->math_rows_.find(cell);
 428         LATTEST(it != d->math_rows_.end());
 429         return it->second;
 430 }
 431
 432
 433 void BufferView::setMathRow(MathData const * cell, MathRow const & mrow)
 434 {
 435         d->math_rows_[cell] = mrow;
 436 }
 437
 438
 439 Buffer & BufferView::buffer()
 440 {
 441         return buffer_;
 442 }
 443
 444
 445 Buffer const & BufferView::buffer() const
 446 {
 447         return buffer_;
 448 }
 449
 450
 451 docstring const & BufferView::searchRequestCache() const
 452 {
 453         return theClipboard().getFindBuffer();
 454 }
 455
 456
 457 void BufferView::setSearchRequestCache(docstring const & text)
 458 {
 459         bool casesensitive;
 460         bool matchword;
 461         bool forward;
 462         bool wrap;
 463         bool instant;
 464         bool onlysel;
 465         docstring const search = string2find(text, casesensitive, matchword,
 466                                              forward, wrap, instant, onlysel);
 467         theClipboard().setFindBuffer(search);
 468 }
 469
 470
 471 bool BufferView::needsFitCursor() const
 472 {
 473         if (cursorStatus(d->cursor_) == CUR_INSIDE) {
 474                 frontend::FontMetrics const & fm =
 475                         theFontMetrics(d->cursor_.getFont().fontInfo());
 476                 int const asc = fm.maxAscent();
 477                 int const des = fm.maxDescent();
 478                 Point const p = getPos(d->cursor_);
 479                 if (p.y_ - asc >= 0 && p.y_ + des < height_)
 480                         return false;
 481         }
 482         return true;
 483 }
 484
 485
 486 namespace {
 487
 488 // this is for debugging only.
 489 string flagsAsString(Update::flags flags)
 490 {
 491         if (flags == Update::None)
 492                 return "None ";
 493         return string((flags & Update::FitCursor) ? "FitCursor " : "")
 494                 + ((flags & Update::Force) ? "Force " : "")
 495                 + ((flags & Update::ForceDraw) ? "ForceDraw " : "")
 496                 + ((flags & Update::SinglePar) ? "SinglePar " : "")
 497                 + ((flags & Update::Decoration) ? "Decoration " : "");
 498 }
 499
 500 }
 501
 502 void BufferView::processUpdateFlags(Update::flags flags)
 503 {
 504         LYXERR(Debug::PAINTING, "BufferView::processUpdateFlags( "
 505                    << flagsAsString(flags) << ")  buffer: " << &buffer_);
 506
 507         // Case when no explicit update is requested.
 508         if (flags == Update::None)
 509                 return;
 510
 511         /* FIXME We would like to avoid doing this here, since it is very
 512          * expensive and is called in updateBuffer already. However, even
 513          * inserting a plain character can invalidate the overly fragile
 514          * tables of child documents built by updateMacros. Some work is
 515          * needed to avoid doing that when not necessary.
 516          */
 517         buffer_.updateMacros();
 518
 519         // First check whether the metrics and inset positions should be updated
 520         if (flags & Update::Force) {
 521                 // This will update the CoordCache items and replace Force
 522                 // with ForceDraw in flags.
 523                 updateMetrics(flags);
 524         }
 525
 526         // Detect whether we can only repaint a single paragraph (if we
 527         // are not already redrawing all).
 528         // We handle this before FitCursor because the later will require
 529         // correct metrics at cursor position.
 530         if (!(flags & Update::ForceDraw)
 531                         && (flags & Update::SinglePar)
 532                         && !singleParUpdate())
 533                 updateMetrics(flags);
 534
 535         // Then make sure that the screen contains the cursor if needed
 536         if (flags & Update::FitCursor) {
 537                 if (needsFitCursor()) {
 538                         // First try to make the selection start visible
 539                         // (which is just the cursor when there is no selection)
 540                         scrollToCursor(d->cursor_.selectionBegin(), false);
 541                         // Metrics have to be recomputed (maybe again)
 542                         updateMetrics();
 543                         // Is the cursor visible? (only useful if cursor is at end of selection)
 544                         if (needsFitCursor()) {
 545                                 // then try to make cursor visible instead
 546                                 scrollToCursor(d->cursor_, false);
 547                                 // Metrics have to be recomputed (maybe again)
 548                                 updateMetrics(flags);
 549                         }
 550                 }
 551                 flags = flags & ~Update::FitCursor;
 552         }
 553
 554         // Add flags to the the update flags. These will be reset to None
 555         // after the redraw is actually done
 556         d->update_flags_ = d->update_flags_ | flags;
 557         LYXERR(Debug::PAINTING, "Cumulative flags: " << flagsAsString(flags));
 558
 559         // Now compute the update strategy
 560         // Possibly values in flag are None, SinglePar, Decoration, ForceDraw
 561         LATTEST((d->update_flags_ & ~(Update::None | Update::SinglePar
 562                                       | Update::Decoration | Update::ForceDraw)) == 0);
 563
 564         if (d->update_flags_ & Update::ForceDraw)
 565                 d->update_strategy_ = FullScreenUpdate;
 566         else if (d->update_flags_ & Update::Decoration)
 567                 d->update_strategy_ = DecorationUpdate;
 568         else if (d->update_flags_ & Update::SinglePar)
 569                 d->update_strategy_ = SingleParUpdate;
 570         else {
 571                 // no need to redraw anything.
 572                 d->update_strategy_ = NoScreenUpdate;
 573         }
 574
 575         updateHoveredInset();
 576
 577         // Trigger a redraw.
 578         buffer_.changed(false);
 579 }
 580
 581
 582 void BufferView::updateScrollbar()
 583 {
 584         if (height_ == 0 && width_ == 0)
 585                 return;
 586
 587         // We prefer fixed size line scrolling.
 588         d->scrollbarParameters_.single_step = defaultRowHeight();
 589         // We prefer full screen page scrolling.
 590         d->scrollbarParameters_.page_step = height_;
 591
 592         Text & t = buffer_.text();
 593         TextMetrics & tm = d->text_metrics_[&t];
 594
 595         LYXERR(Debug::GUI, " Updating scrollbar: height: "
 596                 << t.paragraphs().size()
 597                 << " curr par: " << d->cursor_.bottom().pit()
 598                 << " default height " << defaultRowHeight());
 599
 600         size_t const parsize = t.paragraphs().size();
 601         if (d->par_height_.size() != parsize) {
 602                 d->par_height_.clear();
 603                 // FIXME: We assume a default paragraph height of 2 rows. This
 604                 // should probably be pondered with the screen width.
 605                 d->par_height_.resize(parsize, defaultRowHeight() * 2);
 606         }
 607
 608         // Look at paragraph heights on-screen
 609         pair<pit_type, ParagraphMetrics const *> first = tm.first();
 610         pair<pit_type, ParagraphMetrics const *> last = tm.last();
 611         for (pit_type pit = first.first; pit <= last.first; ++pit) {
 612                 d->par_height_[pit] = tm.parMetrics(pit).height();
 613                 LYXERR(Debug::SCROLLING, "storing height for pit " << pit << " : "
 614                         << d->par_height_[pit]);
 615         }
 616
 617         int top_pos = first.second->position() - first.second->ascent();
 618         int bottom_pos = last.second->position() + last.second->descent();
 619         bool first_visible = first.first == 0 && top_pos >= 0;
 620         bool last_visible = last.first + 1 == int(parsize) && bottom_pos <= height_;
 621         if (first_visible && last_visible) {
 622                 d->scrollbarParameters_.min = 0;
 623                 d->scrollbarParameters_.max = 0;
 624                 return;
 625         }
 626
 627         d->scrollbarParameters_.min = top_pos;
 628         for (size_t i = 0; i != size_t(first.first); ++i)
 629                 d->scrollbarParameters_.min -= d->par_height_[i];
 630         d->scrollbarParameters_.max = bottom_pos;
 631         for (size_t i = last.first + 1; i != parsize; ++i)
 632                 d->scrollbarParameters_.max += d->par_height_[i];
 633
 634         // The reference is the top position so we remove one page.
 635         if (lyxrc.scroll_below_document)
 636                 d->scrollbarParameters_.max -= minVisiblePart();
 637         else
 638                 d->scrollbarParameters_.max -= d->scrollbarParameters_.page_step;
 639
 640         // 0 must be inside the range as it denotes the current position
 641         if (d->scrollbarParameters_.max < 0)
 642                 d->scrollbarParameters_.max = 0;
 643         if (d->scrollbarParameters_.min > 0)
 644                 d->scrollbarParameters_.min = 0;
 645 }
 646
 647
 648 ScrollbarParameters const & BufferView::scrollbarParameters() const
 649 {
 650         return d->scrollbarParameters_;
 651 }
 652
 653
 654 docstring BufferView::toolTip(int x, int y) const
 655 {
 656         // Get inset under mouse, if there is one.
 657         Inset const * covering_inset = getCoveringInset(buffer_.text(), x, y);
 658         if (!covering_inset)
 659                 // No inset, no tooltip...
 660                 return docstring();
 661         return covering_inset->toolTip(*this, x, y);
 662 }
 663
 664
 665 string BufferView::contextMenu(int x, int y) const
 666 {
 667         //If there is a selection, return the containing inset menu
 668         if (d->cursor_.selection())
 669                 return d->cursor_.inset().contextMenu(*this, x, y);
 670
 671         // Get inset under mouse, if there is one.
 672         Inset const * covering_inset = getCoveringInset(buffer_.text(), x, y);
 673         if (covering_inset) {
 674                 if (covering_inset->asInsetMath()) {
 675                         CoordCache::Insets const & inset_cache =
 676                                 coordCache().getInsets();
 677                         Inset const * inner_inset = mathContextMenu(
 678                                 covering_inset->asInsetMath()->asNestInset(),
 679                                 inset_cache, x, y);
 680                         if (inner_inset)
 681                                 return inner_inset->contextMenu(*this, x, y);
 682                 }
 683                 return covering_inset->contextMenu(*this, x, y);
 684         }
 685
 686         return buffer_.inset().contextMenu(*this, x, y);
 687 }
 688
 689
 690 Inset const * BufferView::mathContextMenu(InsetMathNest const * inset,
 691                 CoordCache::Insets const & inset_cache, int x, int y) const
 692 {
 693         for (size_t i = 0; i < inset->nargs(); ++i) {
 694                 MathData const & ar = inset->cell(i);
 695                 for (size_t j = 0; j < ar.size(); ++j) {
 696                         string const name = lyxerr.debugging(Debug::MATHED)
 697                                 ? insetName(ar[j].nucleus()->lyxCode())
 698                                 : string();
 699                         LYXERR(Debug::MATHED, "Examining inset: " << name);
 700                         if (!ar[j].nucleus()->contextMenuName().empty()) {
 701                                 if (inset_cache.covers(ar[j].nucleus(), x, y)) {
 702                                         LYXERR(Debug::MATHED, "Hit inset: "
 703                                                << name);
 704                                         return ar[j].nucleus();
 705                                 }
 706                         }
 707                         InsetMathNest const * imn =
 708                                 ar[j].nucleus()->asNestInset();
 709                         if (imn) {
 710                                 Inset const * inner =
 711                                         mathContextMenu(imn, inset_cache, x, y);
 712                                 if (inner)
 713                                         return inner;
 714                         }
 715                 }
 716         }
 717         return nullptr;
 718 }
 719
 720
 721 void BufferView::scrollDocView(int const pixels, bool update)
 722 {
 723         // The scrollbar values are relative to the top of the screen, therefore the
 724         // offset is equal to the target value.
 725
 726         // No scrolling at all? No need to redraw anything
 727         if (pixels == 0)
 728                 return;
 729
 730         // If the offset is less than 2 screen height, prefer to scroll instead.
 731         if (abs(pixels) <= 2 * height_) {
 732                 d->anchor_ypos_ -= pixels;
 733                 processUpdateFlags(Update::Force);
 734                 return;
 735         }
 736
 737         // cut off at the top
 738         if (pixels <= d->scrollbarParameters_.min) {
 739                 DocIterator dit = doc_iterator_begin(&buffer_);
 740                 showCursor(dit, false, update);
 741                 LYXERR(Debug::SCROLLING, "scroll to top");
 742                 return;
 743         }
 744
 745         // cut off at the bottom
 746         if (pixels >= d->scrollbarParameters_.max) {
 747                 DocIterator dit = doc_iterator_end(&buffer_);
 748                 dit.backwardPos();
 749                 showCursor(dit, false, update);
 750                 LYXERR(Debug::SCROLLING, "scroll to bottom");
 751                 return;
 752         }
 753
 754         // find paragraph at target position
 755         int par_pos = d->scrollbarParameters_.min;
 756         pit_type i = 0;
 757         for (; i != int(d->par_height_.size()); ++i) {
 758                 par_pos += d->par_height_[i];
 759                 if (par_pos >= pixels)
 760                         break;
 761         }
 762
 763         if (par_pos < pixels) {
 764                 // It seems we didn't find the correct pit so stay on the safe side and
 765                 // scroll to bottom.
 766                 LYXERR0("scrolling position not found!");
 767                 scrollDocView(d->scrollbarParameters_.max, update);
 768                 return;
 769         }
 770
 771         DocIterator dit = doc_iterator_begin(&buffer_);
 772         dit.pit() = i;
 773         LYXERR(Debug::SCROLLING, "pixels = " << pixels << " -> scroll to pit " << i);
 774         showCursor(dit, false, update);
 775 }
 776
 777
 778 // FIXME: this method is not working well.
 779 void BufferView::setCursorFromScrollbar()
 780 {
 781         TextMetrics & tm = d->text_metrics_[&buffer_.text()];
 782
 783         int const height = 2 * defaultRowHeight();
 784         int const first = height;
 785         int const last = height_ - height;
 786         int newy = 0;
 787         Cursor const & oldcur = d->cursor_;
 788
 789         switch (cursorStatus(oldcur)) {
 790         case CUR_ABOVE:
 791                 newy = first;
 792                 break;
 793         case CUR_BELOW:
 794                 newy = last;
 795                 break;
 796         case CUR_INSIDE:
 797                 int const y = getPos(oldcur).y_;
 798                 newy = min(last, max(y, first));
 799                 if (y == newy)
 800                         return;
 801         }
 802         // We reset the cursor because cursorStatus() does not
 803         // work when the cursor is within mathed.
 804         Cursor cur(*this);
 805         cur.reset();
 806         tm.setCursorFromCoordinates(cur, 0, newy);
 807
 808         // update the bufferview cursor and notify insets
 809         // FIXME: Care about the d->cursor_ flags to redraw if needed
 810         Cursor old = d->cursor_;
 811         mouseSetCursor(cur);
 812         // the DEPM call in mouseSetCursor() might have destroyed the
 813         // paragraph the cursor is in.
 814         bool badcursor = old.fixIfBroken();
 815         badcursor |= notifyCursorLeavesOrEnters(old, d->cursor_);
 816         if (badcursor)
 817                 d->cursor_.fixIfBroken();
 818 }
 819
 820
 821 Change const BufferView::getCurrentChange() const
 822 {
 823         if (!d->cursor_.selection())
 824                 return Change(Change::UNCHANGED);
 825
 826         DocIterator dit = d->cursor_.selectionBegin();
 827         // The selected content might have been changed (see #7685)
 828         dit = dit.getInnerText();
 829         return dit.paragraph().lookupChange(dit.pos());
 830 }
 831
 832
 833 // this could be used elsewhere as well?
 834 // FIXME: This does not work within mathed!
 835 CursorStatus BufferView::cursorStatus(DocIterator const & dit) const
 836 {
 837         Point const p = getPos(dit);
 838         if (p.y_ < 0)
 839                 return CUR_ABOVE;
 840         if (p.y_ > workHeight())
 841                 return CUR_BELOW;
 842         return CUR_INSIDE;
 843 }
 844
 845
 846 void BufferView::bookmarkEditPosition()
 847 {
 848         // Don't eat cpu time for each keystroke
 849         if (d->cursor_.paragraph().id() == d->bookmark_edit_position_)
 850                 return;
 851         saveBookmark(0);
 852         d->bookmark_edit_position_ = d->cursor_.paragraph().id();
 853 }
 854
 855
 856 void BufferView::saveBookmark(unsigned int idx)
 857 {
 858         if (buffer().isInternal())
 859                 return;
 860
 861         // tentatively save bookmark, id and pos will be used to
 862         // acturately locate a bookmark in a 'live' lyx session.
 863         // pit and pos will be updated with bottom level pit/pos
 864         // when lyx exits.
 865         theSession().bookmarks().save(
 866                 buffer_.fileName(),
 867                 d->cursor_.bottom().pit(),
 868                 d->cursor_.bottom().pos(),
 869                 d->cursor_.paragraph().id(),
 870                 d->cursor_.pos(),
 871                 idx
 872         );
 873         if (idx)
 874                 // emit message signal.
 875                 message(_("Save bookmark"));
 876 }
 877
 878
 879 bool BufferView::moveToPosition(pit_type bottom_pit, pos_type bottom_pos,
 880         int top_id, pos_type top_pos)
 881 {
 882         bool success = false;
 883         DocIterator dit;
 884
 885         d->cursor_.clearSelection();
 886
 887         // if a valid par_id is given, try it first
 888         // This is the case for a 'live' bookmark when unique paragraph ID
 889         // is used to track bookmarks.
 890         if (top_id > 0) {
 891                 dit = buffer_.getParFromID(top_id);
 892                 if (!dit.atEnd()) {
 893                         dit.pos() = min(dit.paragraph().size(), top_pos);
 894                         // Some slices of the iterator may not be
 895                         // reachable (e.g. closed collapsible inset)
 896                         // so the dociterator may need to be
 897                         // shortened. Otherwise, setCursor may crash
 898                         // lyx when the cursor can not be set to these
 899                         // insets.
 900                         size_t const n = dit.depth();
 901                         for (size_t i = 0; i < n; ++i)
 902                                 if (!dit[i].inset().editable()) {
 903                                         dit.resize(i);
 904                                         break;
 905                                 }
 906                         success = true;
 907                 }
 908         }
 909
 910         // if top_id == 0, or searching through top_id failed
 911         // This is the case for a 'restored' bookmark when only bottom
 912         // (document level) pit was saved. Because of this, bookmark
 913         // restoration is inaccurate. If a bookmark was within an inset,
 914         // it will be restored to the left of the outmost inset that contains
 915         // the bookmark.
 916         if (!success && bottom_pit < int(buffer_.paragraphs().size())) {
 917                 dit = doc_iterator_begin(&buffer_);
 918
 919                 dit.pit() = bottom_pit;
 920                 dit.pos() = min(bottom_pos, dit.paragraph().size());
 921                 success = true;
 922         }
 923
 924         if (success) {
 925                 // Note: only bottom (document) level pit is set.
 926                 setCursor(dit);
 927                 // set the current font.
 928                 d->cursor_.setCurrentFont();
 929                 // Do not forget to reset the anchor (see #9912)
 930                 d->cursor_.resetAnchor();
 931                 processUpdateFlags(Update::Force | Update::FitCursor);
 932         }
 933
 934         return success;
 935 }
 936
 937
 938 void BufferView::translateAndInsert(char_type c, Text * t, Cursor & cur)
 939 {
 940         if (d->cursor_.real_current_font.isRightToLeft()) {
 941                 if (d->intl_.keymap == Intl::PRIMARY)
 942                         d->intl_.keyMapSec();
 943         } else {
 944                 if (d->intl_.keymap == Intl::SECONDARY)
 945                         d->intl_.keyMapPrim();
 946         }
 947
 948         d->intl_.getTransManager().translateAndInsert(c, t, cur);
 949 }
 950
 951
 952 int BufferView::workWidth() const
 953 {
 954         return width_;
 955 }
 956
 957
 958 void BufferView::recenter()
 959 {
 960         showCursor(d->cursor_, true, true);
 961 }
 962
 963
 964 void BufferView::showCursor()
 965 {
 966         showCursor(d->cursor_, false, true);
 967 }
 968
 969
 970 void BufferView::showCursor(DocIterator const & dit,
 971         bool recenter, bool update)
 972 {
 973         if (scrollToCursor(dit, recenter) && update)
 974                 processUpdateFlags(Update::Force);
 975 }
 976
 977
 978 void BufferView::scrollToCursor()
 979 {
 980         if (scrollToCursor(d->cursor_, false))
 981                 processUpdateFlags(Update::Force);
 982 }
 983
 984
 985 bool BufferView::scrollToCursor(DocIterator const & dit, bool const recenter)
 986 {
 987         // We are not properly started yet, delay until resizing is done.
 988         if (height_ == 0)
 989                 return false;
 990
 991         if (recenter)
 992                 LYXERR(Debug::SCROLLING, "recentering and scrolling to cursor");
 993         else
 994                 LYXERR(Debug::SCROLLING, "scrolling to cursor");
 995
 996         CursorSlice const & bot = dit.bottom();
 997         TextMetrics & tm = textMetrics(bot.text());
 998
 999         pos_type const max_pit = pos_type(bot.text()->paragraphs().size() - 1);
1000         pos_type bot_pit = bot.pit();
1001         if (bot_pit > max_pit) {
1002                 // FIXME: Why does this happen?
1003                 LYXERR0("bottom pit is greater that max pit: "
1004                         << bot_pit << " > " << max_pit);
1005                 bot_pit = max_pit;
1006         }
1007
1008         if (bot_pit == tm.first().first - 1)
1009                 tm.newParMetricsUp();
1010         else if (bot_pit == tm.last().first + 1)
1011                 tm.newParMetricsDown();
1012
1013         if (tm.contains(bot_pit)) {
1014                 ParagraphMetrics const & pm = tm.parMetrics(bot_pit);
1015                 LBUFERR(!pm.rows().empty());
1016                 // FIXME: smooth scrolling doesn't work in mathed.
1017                 CursorSlice const & cs = dit.innerTextSlice();
1018                 int const ypos = pm.position() + coordOffset(dit).y_;
1019                 ParagraphMetrics const & inner_pm =
1020                         textMetrics(cs.text()).parMetrics(cs.pit());
1021                 Dimension const & row_dim =
1022                         inner_pm.getRow(cs.pos(), dit.boundary()).dim();
1023                 int scrolled = 0;
1024                 if (recenter)
1025                         scrolled = scroll(ypos - height_/2);
1026
1027                 // We try to visualize the whole row, if the row height is larger than
1028                 // the screen height, we scroll to a heuristic value of height_ / 4.
1029                 // FIXME: This heuristic value should be replaced by a recursive search
1030                 // for a row in the inset that can be visualized completely.
1031                 else if (row_dim.height() > height_) {
1032                         if (ypos < defaultRowHeight())
1033                                 scrolled = scroll(ypos - height_ / 4);
1034                         else if (ypos > height_ - defaultRowHeight())
1035                                 scrolled = scroll(ypos - 3 * height_ / 4);
1036                 }
1037
1038                 // If the top part of the row falls of the screen, we scroll
1039                 // up to align the top of the row with the top of the screen.
1040                 else if (ypos - row_dim.ascent() < 0 && ypos < height_) {
1041                         int const ynew = row_dim.ascent();
1042                         scrolled = scrollUp(ynew - ypos);
1043                 }
1044
1045                 // If the bottom of the row falls of the screen, we scroll down.
1046                 else if (ypos + row_dim.descent() > height_ && ypos > 0) {
1047                         int const ynew = height_ - row_dim.descent();
1048                         scrolled = scrollDown(ypos - ynew);
1049                 }
1050
1051                 // else, nothing to do, the cursor is already visible so we just return.
1052                 return scrolled != 0;
1053         }
1054
1055         // fix inline completion position
1056         if (d->inlineCompletionPos_.fixIfBroken())
1057                 d->inlineCompletionPos_ = DocIterator();
1058
1059         tm.redoParagraph(bot_pit);
1060         ParagraphMetrics const & pm = tm.parMetrics(bot_pit);
1061         int const offset = coordOffset(dit).y_;
1062
1063         d->anchor_pit_ = bot_pit;
1064         CursorSlice const & cs = dit.innerTextSlice();
1065         ParagraphMetrics const & inner_pm =
1066                 textMetrics(cs.text()).parMetrics(cs.pit());
1067         Dimension const & row_dim =
1068                 inner_pm.getRow(cs.pos(), dit.boundary()).dim();
1069
1070         if (recenter)
1071                 d->anchor_ypos_ = height_/2;
1072         else if (d->anchor_pit_ == 0)
1073                 d->anchor_ypos_ = offset + pm.ascent();
1074         else if (d->anchor_pit_ == max_pit)
1075                 d->anchor_ypos_ = height_ - offset - row_dim.descent();
1076         else if (offset > height_)
1077                 d->anchor_ypos_ = height_ - offset - defaultRowHeight();
1078         else
1079                 d->anchor_ypos_ = defaultRowHeight() * 2;
1080
1081         return true;
1082 }
1083
1084
1085 void BufferView::makeDocumentClass()
1086 {
1087         DocumentClassConstPtr olddc = buffer_.params().documentClassPtr();
1088         buffer_.params().makeDocumentClass(buffer_.isClone(), buffer_.isInternal());
1089         updateDocumentClass(olddc);
1090 }
1091
1092
1093 void BufferView::updateDocumentClass(DocumentClassConstPtr olddc)
1094 {
1095         message(_("Converting document to new document class..."));
1096
1097         StableDocIterator backcur(d->cursor_);
1098         ErrorList & el = buffer_.errorList("Class Switch");
1099         cap::switchBetweenClasses(
1100                         olddc, buffer_.params().documentClassPtr(),
1101                         static_cast<InsetText &>(buffer_.inset()), el);
1102
1103         setCursor(backcur.asDocIterator(&buffer_));
1104
1105         buffer_.errors("Class Switch");
1106 }
1107
1108
1109 /** Return the change status at cursor position, taking into account the
1110  * status at each level of the document iterator (a table in a deleted
1111  * footnote is deleted).
1112  * When \param outer is true, the top slice is not looked at.
1113  */
1114 static Change::Type lookupChangeType(DocIterator const & dit, bool outer = false)
1115 {
1116         size_t const depth = dit.depth() - (outer ? 1 : 0);
1117
1118         for (size_t i = 0 ; i < depth ; ++i) {
1119                 CursorSlice const & slice = dit[i];
1120                 if (!slice.inset().inMathed()
1121                     && slice.pos() < slice.paragraph().size()) {
1122                         Change::Type const ch = slice.paragraph().lookupChange(slice.pos()).type;
1123                         if (ch != Change::UNCHANGED)
1124                                 return ch;
1125                 }
1126         }
1127         return Change::UNCHANGED;
1128 }
1129
1130
1131 bool BufferView::getStatus(FuncRequest const & cmd, FuncStatus & flag)
1132 {
1133         FuncCode const act = cmd.action();
1134
1135         // Can we use a readonly buffer?
1136         if (buffer_.isReadonly()
1137             && !lyxaction.funcHasFlag(act, LyXAction::ReadOnly)
1138             && !lyxaction.funcHasFlag(act, LyXAction::NoBuffer)) {
1139                 if (buffer_.hasReadonlyFlag())
1140                         flag.message(from_utf8(N_("Document is read-only")));
1141                 else
1142                         flag.message(from_utf8(N_("Document has been modified externally")));
1143                 flag.setEnabled(false);
1144                 return true;
1145         }
1146
1147         // Are we in a DELETED change-tracking region?
1148         if (lookupChangeType(d->cursor_, true) == Change::DELETED
1149             && !lyxaction.funcHasFlag(act, LyXAction::ReadOnly)
1150             && !lyxaction.funcHasFlag(act, LyXAction::NoBuffer)) {
1151                 flag.message(from_utf8(N_("This portion of the document is deleted.")));
1152                 flag.setEnabled(false);
1153                 return true;
1154         }
1155
1156         Cursor & cur = d->cursor_;
1157
1158         if (cur.getStatus(cmd, flag))
1159                 return true;
1160
1161         switch (act) {
1162
1163         // FIXME: This is a bit problematic because we don't check if this is
1164         // a document BufferView or not for these LFUNs. We probably have to
1165         // dispatch both to currentBufferView() and, if that fails,
1166         // to documentBufferView(); same as we do now for current Buffer and
1167         // document Buffer. Ideally those LFUN should go to Buffer as they
1168         // operate on the full Buffer and the cursor is only needed either for
1169         // an Undo record or to restore a cursor position. But we don't know
1170         // how to do that inside Buffer of course.
1171         case LFUN_BUFFER_PARAMS_APPLY:
1172         case LFUN_LAYOUT_MODULES_CLEAR:
1173         case LFUN_LAYOUT_MODULE_ADD:
1174         case LFUN_LAYOUT_RELOAD:
1175         case LFUN_TEXTCLASS_APPLY:
1176         case LFUN_TEXTCLASS_LOAD:
1177                 flag.setEnabled(!buffer_.isReadonly());
1178                 break;
1179
1180         case LFUN_UNDO:
1181                 // We do not use the LyXAction flag for readonly because Undo sets the
1182                 // buffer clean/dirty status by itself.
1183                 flag.setEnabled(!buffer_.isReadonly() && buffer_.undo().hasUndoStack());
1184                 break;
1185         case LFUN_REDO:
1186                 // We do not use the LyXAction flag for readonly because Redo sets the
1187                 // buffer clean/dirty status by itself.
1188                 flag.setEnabled(!buffer_.isReadonly() && buffer_.undo().hasRedoStack());
1189                 break;
1190         case LFUN_FILE_INSERT_PLAINTEXT_PARA:
1191         case LFUN_FILE_INSERT_PLAINTEXT: {
1192                 docstring const & fname = cmd.argument();
1193                 if (!FileName::isAbsolute(to_utf8(fname))) {
1194                         flag.message(_("Absolute filename expected."));
1195                         return false;
1196                 }
1197                 flag.setEnabled(cur.inTexted());
1198                 break;
1199         }
1200         case LFUN_FILE_INSERT:
1201         case LFUN_BOOKMARK_SAVE:
1202                 // FIXME: Actually, these LFUNS should be moved to Text
1203                 flag.setEnabled(cur.inTexted());
1204                 break;
1205
1206         case LFUN_FONT_STATE:
1207         case LFUN_LABEL_INSERT:
1208         case LFUN_INFO_INSERT:
1209         case LFUN_PARAGRAPH_GOTO:
1210         case LFUN_NOTE_NEXT:
1211         case LFUN_REFERENCE_NEXT:
1212         case LFUN_WORD_FIND:
1213         case LFUN_WORD_FIND_FORWARD:
1214         case LFUN_WORD_FIND_BACKWARD:
1215         case LFUN_WORD_REPLACE:
1216         case LFUN_MARK_OFF:
1217         case LFUN_MARK_ON:
1218         case LFUN_MARK_TOGGLE:
1219         case LFUN_SEARCH_STRING_SET:
1220         case LFUN_SCREEN_RECENTER:
1221         case LFUN_SCREEN_SHOW_CURSOR:
1222         case LFUN_BIBTEX_DATABASE_ADD:
1223         case LFUN_BIBTEX_DATABASE_DEL:
1224         case LFUN_STATISTICS:
1225         case LFUN_KEYMAP_OFF:
1226         case LFUN_KEYMAP_PRIMARY:
1227         case LFUN_KEYMAP_SECONDARY:
1228         case LFUN_KEYMAP_TOGGLE:
1229         case LFUN_INSET_SELECT_ALL:
1230                 flag.setEnabled(true);
1231                 break;
1232
1233         case LFUN_GRAPHICS_UNIFY:
1234                 flag.setEnabled(cur.countInsetsInSelection(GRAPHICS_CODE)>1);
1235                 break;
1236
1237         case LFUN_WORD_FINDADV: {
1238                 FindAndReplaceOptions opt;
1239                 istringstream iss(to_utf8(cmd.argument()));
1240                 iss >> opt;
1241                 flag.setEnabled(opt.repl_buf_name.empty()
1242                                 || !buffer_.isReadonly());
1243                 break;
1244         }
1245
1246         case LFUN_LABEL_GOTO:
1247                 flag.setEnabled(!cmd.argument().empty()
1248                     || getInsetByCode<InsetRef>(cur, REF_CODE)
1249                     || getInsetByCode<InsetMathRef>(cur, MATH_REF_CODE));
1250                 break;
1251
1252         case LFUN_CHANGES_MERGE:
1253         case LFUN_CHANGE_NEXT:
1254         case LFUN_CHANGE_PREVIOUS:
1255         case LFUN_ALL_CHANGES_ACCEPT:
1256         case LFUN_ALL_CHANGES_REJECT:
1257                 flag.setEnabled(buffer_.areChangesPresent());
1258                 break;
1259
1260         case LFUN_SCREEN_UP:
1261         case LFUN_SCREEN_DOWN:
1262         case LFUN_SCROLL:
1263         case LFUN_SCREEN_UP_SELECT:
1264         case LFUN_SCREEN_DOWN_SELECT:
1265         case LFUN_INSET_FORALL:
1266                 flag.setEnabled(true);
1267                 break;
1268
1269         case LFUN_LAYOUT_TABULAR:
1270                 flag.setEnabled(cur.innerInsetOfType(TABULAR_CODE));
1271                 break;
1272
1273         case LFUN_LAYOUT:
1274                 flag.setEnabled(!cur.inset().forcePlainLayout(cur.idx()));
1275                 break;
1276
1277         case LFUN_LAYOUT_PARAGRAPH:
1278                 flag.setEnabled(cur.inset().allowParagraphCustomization(cur.idx()));
1279                 break;
1280
1281         case LFUN_BRANCH_ADD_INSERT:
1282                 flag.setEnabled(!(cur.inTexted() && cur.paragraph().isPassThru()));
1283                 break;
1284
1285         case LFUN_DIALOG_SHOW_NEW_INSET:
1286                 // FIXME: this is wrong, but I do not understand the
1287                 // intent (JMarc)
1288                 if (cur.inset().lyxCode() == CAPTION_CODE)
1289                         return cur.inset().getStatus(cur, cmd, flag);
1290                 // FIXME we should consider passthru paragraphs too.
1291                 flag.setEnabled(!(cur.inTexted() && cur.paragraph().isPassThru()));
1292                 break;
1293
1294         case LFUN_CITATION_INSERT: {
1295                 FuncRequest fr(LFUN_INSET_INSERT, "citation");
1296                 // FIXME: This could turn in a recursive hell.
1297                 // Shouldn't we use Buffer::getStatus() instead?
1298                 flag.setEnabled(lyx::getStatus(fr).enabled());
1299                 break;
1300         }
1301         case LFUN_INSET_APPLY: {
1302                 string const name = cmd.getArg(0);
1303                 Inset * inset = editedInset(name);
1304                 if (inset) {
1305                         FuncRequest fr(LFUN_INSET_MODIFY, cmd.argument());
1306                         if (!inset->getStatus(cur, fr, flag)) {
1307                                 // Every inset is supposed to handle this
1308                                 LASSERT(false, break);
1309                         }
1310                 } else {
1311                         FuncRequest fr(LFUN_INSET_INSERT, cmd.argument());
1312                         flag = lyx::getStatus(fr);
1313                 }
1314                 break;
1315         }
1316
1317         case LFUN_COPY:
1318                 flag.setEnabled(cur.selection());
1319                 break;
1320
1321         default:
1322                 return false;
1323         }
1324
1325         return true;
1326 }
1327
1328
1329 Inset * BufferView::editedInset(string const & name) const
1330 {
1331         map<string, Inset *>::const_iterator it = d->edited_insets_.find(name);
1332         return it == d->edited_insets_.end() ? nullptr : it->second;
1333 }
1334
1335
1336 void BufferView::editInset(string const & name, Inset * inset)
1337 {
1338         if (inset)
1339                 d->edited_insets_[name] = inset;
1340         else
1341                 d->edited_insets_.erase(name);
1342 }
1343
1344
1345 void BufferView::dispatch(FuncRequest const & cmd, DispatchResult & dr)
1346 {
1347         LYXERR(Debug::ACTION, "BufferView::dispatch: cmd: " << cmd);
1348
1349         string const argument = to_utf8(cmd.argument());
1350         Cursor & cur = d->cursor_;
1351         Cursor old = cur;
1352
1353         // Don't dispatch function that does not apply to internal buffers.
1354         if (buffer_.isInternal()
1355             && lyxaction.funcHasFlag(cmd.action(), LyXAction::NoInternal))
1356                 return;
1357
1358         // We'll set this back to false if need be.
1359         bool dispatched = true;
1360         buffer_.undo().beginUndoGroup();
1361
1362         FuncCode const act = cmd.action();
1363         switch (act) {
1364
1365         case LFUN_BUFFER_PARAMS_APPLY: {
1366                 DocumentClassConstPtr olddc = buffer_.params().documentClassPtr();
1367                 cur.recordUndoBufferParams();
1368                 istringstream ss(to_utf8(cmd.argument()));
1369                 Lexer lex;
1370                 lex.setStream(ss);
1371                 int const unknown_tokens = buffer_.readHeader(lex);
1372                 if (unknown_tokens != 0) {
1373                         LYXERR0("Warning in LFUN_BUFFER_PARAMS_APPLY!\n"
1374                                                 << unknown_tokens << " unknown token"
1375                                                 << (unknown_tokens == 1 ? "" : "s"));
1376                 }
1377                 updateDocumentClass(olddc);
1378
1379                 // We are most certainly here because of a change in the document
1380                 // It is then better to make sure that all dialogs are in sync with
1381                 // current document settings.
1382                 dr.screenUpdate(Update::Force | Update::FitCursor);
1383                 dr.forceBufferUpdate();
1384                 break;
1385         }
1386
1387         case LFUN_LAYOUT_MODULES_CLEAR: {
1388                 // FIXME: this modifies the document in cap::switchBetweenClasses
1389                 //  without calling recordUndo. Fix this before using
1390                 //  recordUndoBufferParams().
1391                 cur.recordUndoFullBuffer();
1392                 buffer_.params().clearLayoutModules();
1393                 makeDocumentClass();
1394                 dr.screenUpdate(Update::Force);
1395                 dr.forceBufferUpdate();
1396                 break;
1397         }
1398
1399         case LFUN_LAYOUT_MODULE_ADD: {
1400                 BufferParams const & params = buffer_.params();
1401                 if (!params.layoutModuleCanBeAdded(argument)) {
1402                         LYXERR0("Module `" << argument <<
1403                                 "' cannot be added due to failed requirements or "
1404                                 "conflicts with installed modules.");
1405                         break;
1406                 }
1407                 // FIXME: this modifies the document in cap::switchBetweenClasses
1408                 //  without calling recordUndo. Fix this before using
1409                 //  recordUndoBufferParams().
1410                 cur.recordUndoFullBuffer();
1411                 buffer_.params().addLayoutModule(argument);
1412                 makeDocumentClass();
1413                 dr.screenUpdate(Update::Force);
1414                 dr.forceBufferUpdate();
1415                 break;
1416         }
1417
1418         case LFUN_TEXTCLASS_APPLY: {
1419                 // since this shortcircuits, the second call is made only if
1420                 // the first fails
1421                 bool const success =
1422                         LayoutFileList::get().load(argument, buffer_.temppath()) ||
1423                         LayoutFileList::get().load(argument, buffer_.filePath());
1424                 if (!success) {
1425                         docstring s = bformat(_("The document class `%1$s' "
1426                                                  "could not be loaded."), from_utf8(argument));
1427                         frontend::Alert::error(_("Could not load class"), s);
1428                         break;
1429                 }
1430
1431                 LayoutFile const * old_layout = buffer_.params().baseClass();
1432                 LayoutFile const * new_layout = &(LayoutFileList::get()[argument]);
1433
1434                 if (old_layout == new_layout)
1435                         // nothing to do
1436                         break;
1437
1438                 // Save the old, possibly modular, layout for use in conversion.
1439                 // FIXME: this modifies the document in cap::switchBetweenClasses
1440                 //  without calling recordUndo. Fix this before using
1441                 //  recordUndoBufferParams().
1442                 cur.recordUndoFullBuffer();
1443                 buffer_.params().setBaseClass(argument, buffer_.layoutPos());
1444                 makeDocumentClass();
1445                 dr.screenUpdate(Update::Force);
1446                 dr.forceBufferUpdate();
1447                 break;
1448         }
1449
1450         case LFUN_TEXTCLASS_LOAD: {
1451                 // since this shortcircuits, the second call is made only if
1452                 // the first fails
1453                 bool const success =
1454                         LayoutFileList::get().load(argument, buffer_.temppath()) ||
1455                         LayoutFileList::get().load(argument, buffer_.filePath());
1456                 if (!success) {
1457                         docstring s = bformat(_("The document class `%1$s' "
1458                                                  "could not be loaded."), from_utf8(argument));
1459                         frontend::Alert::error(_("Could not load class"), s);
1460                 }
1461                 break;
1462         }
1463
1464         case LFUN_LAYOUT_RELOAD: {
1465                 LayoutFileIndex bc = buffer_.params().baseClassID();
1466                 LayoutFileList::get().reset(bc);
1467                 buffer_.params().setBaseClass(bc, buffer_.layoutPos());
1468                 makeDocumentClass();
1469                 dr.screenUpdate(Update::Force);
1470                 dr.forceBufferUpdate();
1471                 break;
1472         }
1473
1474         case LFUN_UNDO: {
1475                 dr.setMessage(_("Undo"));
1476                 cur.clearSelection();
1477                 // We need to find out if the bibliography information
1478                 // has changed. See bug #11055.
1479                 // So these should not be references...
1480                 string const engine = buffer().params().citeEngine();
1481                 CiteEngineType const enginetype = buffer().params().citeEngineType();
1482                 if (!cur.undoAction())
1483                         dr.setMessage(_("No further undo information"));
1484                 else {
1485                         dr.screenUpdate(Update::Force | Update::FitCursor);
1486                         dr.forceBufferUpdate();
1487                         if (buffer().params().citeEngine() != engine ||
1488                             buffer().params().citeEngineType() != enginetype)
1489                                 buffer().invalidateCiteLabels();
1490                 }
1491                 break;
1492         }
1493
1494         case LFUN_REDO: {
1495                 dr.setMessage(_("Redo"));
1496                 cur.clearSelection();
1497                 // We need to find out if the bibliography information
1498                 // has changed. See bug #11055.
1499                 // So these should not be references...
1500                 string const engine = buffer().params().citeEngine();
1501                 CiteEngineType const enginetype = buffer().params().citeEngineType();
1502                 if (!cur.redoAction())
1503                         dr.setMessage(_("No further redo information"));
1504                 else {
1505                         dr.screenUpdate(Update::Force | Update::FitCursor);
1506                         dr.forceBufferUpdate();
1507                         if (buffer().params().citeEngine() != engine ||
1508                             buffer().params().citeEngineType() != enginetype)
1509                                 buffer().invalidateCiteLabels();
1510                 }
1511                 break;
1512         }
1513
1514         case LFUN_FONT_STATE:
1515                 dr.setMessage(cur.currentState(false));
1516                 break;
1517
1518         case LFUN_BOOKMARK_SAVE:
1519                 dr.screenUpdate(Update::Force);
1520                 saveBookmark(convert<unsigned int>(to_utf8(cmd.argument())));
1521                 break;
1522
1523         case LFUN_LABEL_GOTO: {
1524                 docstring label = cmd.argument();
1525                 if (label.empty()) {
1526                         InsetRef * inset =
1527                                 getInsetByCode<InsetRef>(cur, REF_CODE);
1528                         if (inset) {
1529                                 label = inset->getParam("reference");
1530                                 // persistent=false: use temp_bookmark
1531                                 saveBookmark(0);
1532                         }
1533                 }
1534                 if (!label.empty()) {
1535                         gotoLabel(label);
1536                         // at the moment, this is redundant, since gotoLabel will
1537                         // eventually call LFUN_PARAGRAPH_GOTO, but it seems best
1538                         // to have it here.
1539                         dr.screenUpdate(Update::Force | Update::FitCursor);
1540                 } else {
1541                         InsetMathRef * minset =
1542                                 getInsetByCode<InsetMathRef>(cur, MATH_REF_CODE);
1543                         if (minset)
1544                                 lyx::dispatch(FuncRequest(LFUN_LABEL_GOTO,
1545                                                         minset->getTarget()));
1546                 }
1547                 break;
1548         }
1549
1550         case LFUN_PARAGRAPH_GOTO: {
1551                 int const id = convert<int>(cmd.getArg(0));
1552                 pos_type const pos = convert<int>(cmd.getArg(1));
1553                 if (id < 0)
1554                         break;
1555                 string const str_id_end = cmd.getArg(2);
1556                 string const str_pos_end = cmd.getArg(3);
1557                 int i = 0;
1558                 for (Buffer * b = &buffer_; i == 0 || b != &buffer_;
1559                         b = theBufferList().next(b)) {
1560
1561                         Cursor curs(*this);
1562                         curs.setCursor(b->getParFromID(id));
1563                         if (curs.atEnd()) {
1564                                 LYXERR(Debug::INFO, "No matching paragraph found! [" << id << "].");
1565                                 ++i;
1566                                 continue;
1567                         }
1568                         LYXERR(Debug::INFO, "Paragraph " << curs.paragraph().id()
1569                                 << " found in buffer `"
1570                                 << b->absFileName() << "'.");
1571
1572                         if (b == &buffer_) {
1573                                 bool success;
1574                                 if (str_id_end.empty() || str_pos_end.empty()) {
1575                                         // Set the cursor
1576                                         curs.pos() = pos;
1577                                         mouseSetCursor(curs);
1578                                         success = true;
1579                                 } else {
1580                                         int const id_end = convert<int>(str_id_end);
1581                                         pos_type const pos_end = convert<int>(str_pos_end);
1582                                         success = setCursorFromEntries({id, pos},
1583                                                                        {id_end, pos_end});
1584                                 }
1585                                 if (success)
1586                                         dr.screenUpdate(Update::Force | Update::FitCursor);
1587                         } else {
1588                                 // Switch to other buffer view and resend cmd
1589                                 lyx::dispatch(FuncRequest(
1590                                         LFUN_BUFFER_SWITCH, b->absFileName()));
1591                                 lyx::dispatch(cmd);
1592                         }
1593                         break;
1594                 }
1595                 break;
1596         }
1597
1598         case LFUN_NOTE_NEXT:
1599                 gotoInset(this, { NOTE_CODE }, false);
1600                 // FIXME: if SinglePar is changed to act on the inner
1601                 // paragraph, this will not be OK anymore. The update is
1602                 // useful for auto-open collapsible insets.
1603                 dr.screenUpdate(Update::SinglePar | Update::FitCursor);
1604                 break;
1605
1606         case LFUN_REFERENCE_NEXT: {
1607                 gotoInset(this, { LABEL_CODE, REF_CODE }, true);
1608                 // FIXME: if SinglePar is changed to act on the inner
1609                 // paragraph, this will not be OK anymore. The update is
1610                 // useful for auto-open collapsible insets.
1611                 dr.screenUpdate(Update::SinglePar | Update::FitCursor);
1612                 break;
1613         }
1614
1615         case LFUN_CHANGE_NEXT:
1616                 findNextChange(this);
1617                 if (cur.inset().isTable())
1618                         // In tables, there might be whole changed rows or columns
1619                         cur.dispatch(cmd);
1620                 // FIXME: Move this LFUN to Buffer so that we don't have to do this:
1621                 dr.screenUpdate(Update::Force | Update::FitCursor);
1622                 break;
1623
1624         case LFUN_CHANGE_PREVIOUS:
1625                 findPreviousChange(this);
1626                 if (cur.inset().isTable())
1627                         // In tables, there might be whole changed rows or columns
1628                         cur.dispatch(cmd);
1629                 // FIXME: Move this LFUN to Buffer so that we don't have to do this:
1630                 dr.screenUpdate(Update::Force | Update::FitCursor);
1631                 break;
1632
1633         case LFUN_CHANGES_MERGE:
1634                 if (findNextChange(this) || findPreviousChange(this)) {
1635                         dr.screenUpdate(Update::Force | Update::FitCursor);
1636                         dr.forceBufferUpdate();
1637                         showDialog("changes");
1638                 }
1639                 break;
1640
1641         case LFUN_ALL_CHANGES_ACCEPT: {
1642                 // select complete document
1643                 cur.reset();
1644                 cur.selHandle(true);
1645                 buffer_.text().cursorBottom(cur);
1646                 // accept everything in a single step to support atomic undo
1647                 // temporarily disable track changes in order to end with really
1648                 // no new (e.g., DPSM-caused) changes (see #7487)
1649                 bool const track = buffer_.params().track_changes;
1650                 buffer_.params().track_changes = false;
1651                 buffer_.text().acceptOrRejectChanges(cur, Text::ACCEPT);
1652                 buffer_.params().track_changes = track;
1653                 cur.resetAnchor();
1654                 // FIXME: Move this LFUN to Buffer so that we don't have to do this:
1655                 dr.screenUpdate(Update::Force | Update::FitCursor);
1656                 dr.forceBufferUpdate();
1657                 break;
1658         }
1659
1660         case LFUN_ALL_CHANGES_REJECT: {
1661                 // select complete document
1662                 cur.reset();
1663                 cur.selHandle(true);
1664                 buffer_.text().cursorBottom(cur);
1665                 // reject everything in a single step to support atomic undo
1666                 // temporarily disable track changes in order to end with really
1667                 // no new (e.g., DPSM-caused) changes (see #7487)
1668                 bool const track = buffer_.params().track_changes;
1669                 buffer_.params().track_changes = false;
1670                 buffer_.text().acceptOrRejectChanges(cur, Text::REJECT);
1671                 buffer_.params().track_changes = track;
1672                 cur.resetAnchor();
1673                 // FIXME: Move this LFUN to Buffer so that we don't have to do this:
1674                 dr.screenUpdate(Update::Force | Update::FitCursor);
1675                 dr.forceBufferUpdate();
1676                 break;
1677         }
1678
1679         case LFUN_WORD_FIND_FORWARD:
1680         case LFUN_WORD_FIND_BACKWARD: {
1681                 docstring searched_string;
1682
1683                 if (!cmd.argument().empty()) {
1684                         setSearchRequestCache(cmd.argument());
1685                         searched_string = cmd.argument();
1686                 } else {
1687                         searched_string = searchRequestCache();
1688                 }
1689
1690                 if (searched_string.empty())
1691                         break;
1692
1693                 docstring const data =
1694                         find2string(searched_string, false, false,
1695                                     act == LFUN_WORD_FIND_FORWARD, false, false, false);
1696                 bool found = lyxfind(this, FuncRequest(LFUN_WORD_FIND, data));
1697                 if (found)
1698                         dr.screenUpdate(Update::Force | Update::FitCursor);
1699                 else
1700                         dr.setMessage(_("Search string not found!"));
1701                 break;
1702         }
1703
1704         case LFUN_WORD_FIND: {
1705                 docstring arg = cmd.argument();
1706                 if (arg.empty())
1707                         arg = searchRequestCache();
1708                 if (arg.empty()) {
1709                         lyx::dispatch(FuncRequest(LFUN_DIALOG_SHOW, "findreplace"));
1710                         break;
1711                 }
1712                 if (lyxfind(this, FuncRequest(act, arg)))
1713                         dr.screenUpdate(Update::Force | Update::FitCursor);
1714                 else
1715                         dr.setMessage(_("Search string not found!"));
1716
1717                 setSearchRequestCache(arg);
1718                 break;
1719         }
1720
1721         case LFUN_SEARCH_STRING_SET: {
1722                 docstring pattern = cmd.argument();
1723                 if (!pattern.empty()) {
1724                         setSearchRequestCache(pattern);
1725                         break;
1726                 }
1727                 if (cur.selection())
1728                         pattern = cur.selectionAsString(false);
1729                 else {
1730                         pos_type spos = cur.pos();
1731                         cur.innerText()->selectWord(cur, WHOLE_WORD);
1732                         pattern = cur.selectionAsString(false);
1733                         cur.selection(false);
1734                         cur.pos() = spos;
1735                 }
1736                 setSearchRequestCache(pattern);
1737                 break;
1738         }
1739
1740         case LFUN_WORD_REPLACE: {
1741                 if (lyxreplace(this, cmd)) {
1742                         dr.forceBufferUpdate();
1743                         dr.screenUpdate(Update::Force | Update::FitCursor);
1744                 }
1745                 else
1746                         dr.setMessage(_("Search string not found!"));
1747                 break;
1748         }
1749
1750         case LFUN_WORD_FINDADV: {
1751                 FindAndReplaceOptions opt;
1752                 istringstream iss(to_utf8(cmd.argument()));
1753                 iss >> opt;
1754                 if (findAdv(this, opt)) {
1755                         dr.screenUpdate(Update::Force | Update::FitCursor);
1756                         cur.dispatched();
1757                         dispatched = true;
1758                 } else {
1759                         cur.undispatched();
1760                         dispatched = false;
1761                 }
1762                 break;
1763         }
1764
1765         case LFUN_MARK_OFF:
1766                 cur.clearSelection();
1767                 dr.setMessage(from_utf8(N_("Mark off")));
1768                 break;
1769
1770         case LFUN_MARK_ON:
1771                 cur.clearSelection();
1772                 cur.setMark(true);
1773                 dr.setMessage(from_utf8(N_("Mark on")));
1774                 break;
1775
1776         case LFUN_MARK_TOGGLE:
1777                 cur.selection(false);
1778                 if (cur.mark()) {
1779                         cur.setMark(false);
1780                         dr.setMessage(from_utf8(N_("Mark removed")));
1781                 } else {
1782                         cur.setMark(true);
1783                         dr.setMessage(from_utf8(N_("Mark set")));
1784                 }
1785                 cur.resetAnchor();
1786                 break;
1787
1788         case LFUN_SCREEN_SHOW_CURSOR:
1789                 showCursor();
1790                 break;
1791
1792         case LFUN_SCREEN_RECENTER:
1793                 recenter();
1794                 break;
1795
1796         case LFUN_BIBTEX_DATABASE_ADD: {
1797                 Cursor tmpcur = cur;
1798                 findInset(tmpcur, { BIBTEX_CODE }, false);
1799                 InsetBibtex * inset = getInsetByCode<InsetBibtex>(tmpcur,
1800                                                 BIBTEX_CODE);
1801                 if (inset) {
1802                         if (inset->addDatabase(cmd.argument()))
1803                                 dr.forceBufferUpdate();
1804                 }
1805                 break;
1806         }
1807
1808         case LFUN_BIBTEX_DATABASE_DEL: {
1809                 Cursor tmpcur = cur;
1810                 findInset(tmpcur, { BIBTEX_CODE }, false);
1811                 InsetBibtex * inset = getInsetByCode<InsetBibtex>(tmpcur,
1812                                                 BIBTEX_CODE);
1813                 if (inset) {
1814                         if (inset->delDatabase(cmd.argument()))
1815                                 dr.forceBufferUpdate();
1816                 }
1817                 break;
1818         }
1819
1820         case LFUN_GRAPHICS_UNIFY: {
1821
1822                 cur.recordUndoFullBuffer();
1823
1824                 DocIterator from, to;
1825                 from = cur.selectionBegin();
1826                 to = cur.selectionEnd();
1827
1828                 string const newId = cmd.getArg(0);
1829                 bool fetchId = newId.empty(); //if we wait for groupId from first graphics inset
1830
1831                 InsetGraphicsParams grp_par;
1832                 if (!fetchId)
1833                         InsetGraphics::string2params(graphics::getGroupParams(buffer_, newId), buffer_, grp_par);
1834
1835                 if (!from.nextInset())  //move to closest inset
1836                         from.forwardInset();
1837
1838                 while (!from.empty() && from < to) {
1839                         Inset * inset = from.nextInset();
1840                         if (!inset)
1841                                 break;
1842                         InsetGraphics * ig = inset->asInsetGraphics();
1843                         if (ig) {
1844                                 InsetGraphicsParams inspar = ig->getParams();
1845                                 if (fetchId) {
1846                                         grp_par = inspar;
1847                                         fetchId = false;
1848                                 } else {
1849                                         grp_par.filename = inspar.filename;
1850                                         ig->setParams(grp_par);
1851                                 }
1852                         }
1853                         from.forwardInset();
1854                 }
1855                 dr.screenUpdate(Update::Force); //needed if triggered from context menu
1856                 break;
1857         }
1858
1859         case LFUN_STATISTICS: {
1860                 DocIterator from, to;
1861                 if (cur.selection()) {
1862                         from = cur.selectionBegin();
1863                         to = cur.selectionEnd();
1864                 } else {
1865                         from = doc_iterator_begin(&buffer_);
1866                         to = doc_iterator_end(&buffer_);
1867                 }
1868                 buffer_.updateStatistics(from, to);
1869                 int const words = buffer_.wordCount();
1870                 int const chars = buffer_.charCount(false);
1871                 int const chars_blanks = buffer_.charCount(true);
1872                 docstring message;
1873                 if (cur.selection())
1874                         message = _("Statistics for the selection:");
1875                 else
1876                         message = _("Statistics for the document:");
1877                 message += "\n\n";
1878                 if (words != 1)
1879                         message += bformat(_("%1$d words"), words);
1880                 else
1881                         message += _("One word");
1882                 message += "\n";
1883                 if (chars_blanks != 1)
1884                         message += bformat(_("%1$d characters (including blanks)"),
1885                                           chars_blanks);
1886                 else
1887                         message += _("One character (including blanks)");
1888                 message += "\n";
1889                 if (chars != 1)
1890                         message += bformat(_("%1$d characters (excluding blanks)"),
1891                                           chars);
1892                 else
1893                         message += _("One character (excluding blanks)");
1894
1895                 Alert::information(_("Statistics"), message);
1896         }
1897                 break;
1898
1899         case LFUN_SCREEN_UP:
1900         case LFUN_SCREEN_DOWN: {
1901                 Point p = getPos(cur);
1902                 // This code has been commented out to enable to scroll down a
1903                 // document, even if there are large insets in it (see bug #5465).
1904                 /*if (p.y_ < 0 || p.y_ > height_) {
1905                         // The cursor is off-screen so recenter before proceeding.
1906                         showCursor();
1907                         p = getPos(cur);
1908                 }*/
1909                 int const scrolled = scroll(act == LFUN_SCREEN_UP
1910                         ? -height_ : height_);
1911                 if (act == LFUN_SCREEN_UP && scrolled > -height_)
1912                         p = Point(0, 0);
1913                 if (act == LFUN_SCREEN_DOWN && scrolled < height_)
1914                         p = Point(width_, height_);
1915                 bool const in_texted = cur.inTexted();
1916                 cur.setCursor(doc_iterator_begin(cur.buffer()));
1917                 cur.selHandle(false);
1918                 // Force an immediate computation of metrics because we need it below
1919                 updateMetrics();
1920
1921                 d->text_metrics_[&buffer_.text()].editXY(cur, p.x_, p.y_,
1922                         true, act == LFUN_SCREEN_UP);
1923                 //FIXME: what to do with cur.x_target()?
1924                 bool update = in_texted && cur.bv().checkDepm(cur, old);
1925                 cur.finishUndo();
1926
1927                 if (update || cur.mark())
1928                         dr.screenUpdate(Update::Force | Update::FitCursor);
1929                 if (update)
1930                         dr.forceBufferUpdate();
1931                 break;
1932         }
1933
1934         case LFUN_SCROLL: {
1935                 string const scroll_type = cmd.getArg(0);
1936                 int scroll_step = 0;
1937                 if (scroll_type == "line")
1938                         scroll_step = d->scrollbarParameters_.single_step;
1939                 else if (scroll_type == "page")
1940                         scroll_step = d->scrollbarParameters_.page_step;
1941                 else
1942                         return;
1943                 string const scroll_quantity = cmd.getArg(1);
1944                 if (scroll_quantity == "up")
1945                         scrollUp(scroll_step);
1946                 else if (scroll_quantity == "down")
1947                         scrollDown(scroll_step);
1948                 else {
1949                         int const scroll_value = convert<int>(scroll_quantity);
1950                         if (scroll_value)
1951                                 scroll(scroll_step * scroll_value);
1952                 }
1953                 dr.screenUpdate(Update::ForceDraw);
1954                 dr.forceBufferUpdate();
1955                 break;
1956         }
1957
1958         case LFUN_SCREEN_UP_SELECT: {
1959                 // FIXME: why is the algorithm different from LFUN_SCREEN_UP?
1960                 cur.selHandle(true);
1961                 if (isTopScreen()) {
1962                         lyx::dispatch(FuncRequest(LFUN_BUFFER_BEGIN_SELECT));
1963                         cur.finishUndo();
1964                         break;
1965                 }
1966                 int y = getPos(cur).y_;
1967                 int const ymin = y - height_ + defaultRowHeight();
1968                 while (y > ymin && cur.up())
1969                         y = getPos(cur).y_;
1970
1971                 cur.finishUndo();
1972                 dr.screenUpdate(Update::SinglePar | Update::FitCursor);
1973                 break;
1974         }
1975
1976         case LFUN_SCREEN_DOWN_SELECT: {
1977                 // FIXME: why is the algorithm different from LFUN_SCREEN_DOWN?
1978                 cur.selHandle(true);
1979                 if (isBottomScreen()) {
1980                         lyx::dispatch(FuncRequest(LFUN_BUFFER_END_SELECT));
1981                         cur.finishUndo();
1982                         break;
1983                 }
1984                 int y = getPos(cur).y_;
1985                 int const ymax = y + height_ - defaultRowHeight();
1986                 while (y < ymax && cur.down())
1987                         y = getPos(cur).y_;
1988
1989                 cur.finishUndo();
1990                 dr.screenUpdate(Update::SinglePar | Update::FitCursor);
1991                 break;
1992         }
1993
1994
1995         case LFUN_INSET_SELECT_ALL: {
1996                 // true if all cells are selected
1997                 bool const all_selected = cur.depth() > 1
1998                     && cur.selBegin().at_begin()
1999                     && cur.selEnd().at_end();
2000                 // true if some cells are selected
2001                 bool const cells_selected = cur.depth() > 1
2002                     && cur.selBegin().at_cell_begin()
2003                         && cur.selEnd().at_cell_end();
2004                 if (all_selected || (cells_selected && !cur.inset().isTable())) {
2005                         // All the contents of the inset if selected, or only at
2006                         // least one cell but inset is not a table.
2007                         // Select the inset from outside.
2008                         cur.pop();
2009                         cur.resetAnchor();
2010                         cur.selection(true);
2011                         cur.posForward();
2012                 } else if (cells_selected) {
2013                         // At least one complete cell is selected and inset is a table.
2014                         // Select all cells
2015                         cur.idx() = 0;
2016                         cur.pit() = 0;
2017                         cur.pos() = 0;
2018                         cur.resetAnchor();
2019                         cur.selection(true);
2020                         cur.idx() = cur.lastidx();
2021                         cur.pit() = cur.lastpit();
2022                         cur.pos() = cur.lastpos();
2023                 } else {
2024                         // select current cell
2025                         cur.pit() = 0;
2026                         cur.pos() = 0;
2027                         cur.resetAnchor();
2028                         cur.selection(true);
2029                         cur.pit() = cur.lastpit();
2030                         cur.pos() = cur.lastpos();
2031                 }
2032                 cur.setCurrentFont();
2033                 dr.screenUpdate(Update::Force);
2034                 break;
2035         }
2036
2037
2038         case LFUN_UNICODE_INSERT: {
2039                 if (cmd.argument().empty())
2040                         break;
2041
2042                 FuncCode code = cur.inset().currentMode() == Inset::MATH_MODE ?
2043                         LFUN_MATH_INSERT : LFUN_SELF_INSERT;
2044                 int i = 0;
2045                 while (true) {
2046                         docstring const arg = from_utf8(cmd.getArg(i));
2047                         if (arg.empty())
2048                                 break;
2049                         if (!isHex(arg)) {
2050                                 LYXERR0("Not a hexstring: " << arg);
2051                                 ++i;
2052                                 continue;
2053                         }
2054                         char_type c = hexToInt(arg);
2055                         if (c >= 32 && c < 0x10ffff) {
2056                                 LYXERR(Debug::KEY, "Inserting c: " << c);
2057                                 lyx::dispatch(FuncRequest(code, docstring(1, c)));
2058                         }
2059                         ++i;
2060                 }
2061                 break;
2062         }
2063
2064
2065         // This would be in Buffer class if only Cursor did not
2066         // require a bufferview
2067         case LFUN_INSET_FORALL: {
2068                 docstring const name = from_utf8(cmd.getArg(0));
2069                 string const commandstr = cmd.getLongArg(1);
2070                 FuncRequest const fr = lyxaction.lookupFunc(commandstr);
2071
2072                 // an arbitrary number to limit number of iterations
2073                 const int max_iter = 100000;
2074                 int iterations = 0;
2075                 Cursor & curs = d->cursor_;
2076                 Cursor const savecur = curs;
2077                 curs.reset();
2078                 if (!curs.nextInset())
2079                         curs.forwardInset();
2080                 curs.beginUndoGroup();
2081                 while(curs && iterations < max_iter) {
2082                         Inset * const ins = curs.nextInset();
2083                         if (!ins)
2084                                 break;
2085                         docstring insname = ins->layoutName();
2086                         while (!insname.empty()) {
2087                                 if (insname == name || name == from_utf8("*")) {
2088                                         curs.recordUndo();
2089                                         lyx::dispatch(fr, dr);
2090                                         ++iterations;
2091                                         break;
2092                                 }
2093                                 size_t const i = insname.rfind(':');
2094                                 if (i == string::npos)
2095                                         break;
2096                                 insname = insname.substr(0, i);
2097                         }
2098                         // if we did not delete the inset, skip it
2099                         if (!curs.nextInset() || curs.nextInset() == ins)
2100                                 curs.forwardInset();
2101                 }
2102                 curs = savecur;
2103                 curs.fixIfBroken();
2104                 /** This is a dummy undo record only to remember the cursor
2105                  * that has just been set; this will be used on a redo action
2106                  * (see ticket #10097)
2107
2108                  * FIXME: a better fix would be to have a way to set the
2109                  * cursor value directly, but I am not sure it is worth it.
2110                  */
2111                 curs.recordUndo();
2112                 curs.endUndoGroup();
2113                 dr.screenUpdate(Update::Force);
2114                 dr.forceBufferUpdate();
2115
2116                 if (iterations >= max_iter) {
2117                         dr.setError(true);
2118                         dr.setMessage(bformat(_("`inset-forall' interrupted because number of actions is larger than %1$d"), max_iter));
2119                 } else
2120                         dr.setMessage(bformat(_("Applied \"%1$s\" to %2$d insets"), from_utf8(commandstr), iterations));
2121                 break;
2122         }
2123
2124
2125         case LFUN_BRANCH_ADD_INSERT: {
2126                 docstring branch_name = from_utf8(cmd.getArg(0));
2127                 if (branch_name.empty())
2128                         if (!Alert::askForText(branch_name, _("Branch name")) ||
2129                                                 branch_name.empty())
2130                                 break;
2131
2132                 DispatchResult drtmp;
2133                 buffer_.dispatch(FuncRequest(LFUN_BRANCH_ADD, branch_name), drtmp);
2134                 if (drtmp.error()) {
2135                         Alert::warning(_("Branch already exists"), drtmp.message());
2136                         break;
2137                 }
2138                 docstring const sep = buffer_.params().branchlist().separator();
2139                 for (docstring const & branch : getVectorFromString(branch_name, sep))
2140                         lyx::dispatch(FuncRequest(LFUN_BRANCH_INSERT, branch));
2141                 break;
2142         }
2143
2144         case LFUN_KEYMAP_OFF:
2145                 getIntl().keyMapOn(false);
2146                 break;
2147
2148         case LFUN_KEYMAP_PRIMARY:
2149                 getIntl().keyMapPrim();
2150                 break;
2151
2152         case LFUN_KEYMAP_SECONDARY:
2153                 getIntl().keyMapSec();
2154                 break;
2155
2156         case LFUN_KEYMAP_TOGGLE:
2157                 getIntl().toggleKeyMap();
2158                 break;
2159
2160         case LFUN_DIALOG_SHOW_NEW_INSET: {
2161                 string const name = cmd.getArg(0);
2162                 string data = trim(to_utf8(cmd.argument()).substr(name.size()));
2163                 if (decodeInsetParam(name, data, buffer_))
2164                         lyx::dispatch(FuncRequest(LFUN_DIALOG_SHOW, name + " " + data));
2165                 else
2166                         lyxerr << "Inset type '" << name <<
2167                         "' not recognized in LFUN_DIALOG_SHOW_NEW_INSET" <<  endl;
2168                 break;
2169         }
2170
2171         case LFUN_CITATION_INSERT: {
2172                 if (argument.empty()) {
2173                         lyx::dispatch(FuncRequest(LFUN_DIALOG_SHOW_NEW_INSET, "citation"));
2174                         break;
2175                 }
2176                 // we can have one optional argument, delimited by '|'
2177                 // citation-insert <key>|<text_before>
2178                 // this should be enhanced to also support text_after
2179                 // and citation style
2180                 string arg = argument;
2181                 string opt1;
2182                 if (contains(argument, "|")) {
2183                         arg = token(argument, '|', 0);
2184                         opt1 = token(argument, '|', 1);
2185                 }
2186
2187                 // if our cursor is directly in front of or behind a citation inset,
2188                 // we will instead add the new key to it.
2189                 Inset * inset = cur.nextInset();
2190                 if (!inset || inset->lyxCode() != CITE_CODE)
2191                         inset = cur.prevInset();
2192                 if (inset && inset->lyxCode() == CITE_CODE) {
2193                         InsetCitation * icite = static_cast<InsetCitation *>(inset);
2194                         if (icite->addKey(arg)) {
2195                                 dr.forceBufferUpdate();
2196                                 dr.screenUpdate(Update::FitCursor | Update::SinglePar);
2197                                 if (!opt1.empty())
2198                                         LYXERR0("Discarding optional argument to citation-insert.");
2199                         }
2200                         dispatched = true;
2201                         break;
2202                 }
2203                 InsetCommandParams icp(CITE_CODE);
2204                 icp["key"] = from_utf8(arg);
2205                 if (!opt1.empty())
2206                         icp["before"] = from_utf8(opt1);
2207                 icp["literal"] =
2208                         from_ascii(InsetCitation::last_literal ? "true" : "false");
2209                 string icstr = InsetCommand::params2string(icp);
2210                 FuncRequest fr(LFUN_INSET_INSERT, icstr);
2211                 lyx::dispatch(fr);
2212                 break;
2213         }
2214
2215         case LFUN_INSET_APPLY: {
2216                 string const name = cmd.getArg(0);
2217                 Inset * inset = editedInset(name);
2218                 if (!inset) {
2219                         FuncRequest fr(LFUN_INSET_INSERT, cmd.argument());
2220                         lyx::dispatch(fr);
2221                         break;
2222                 }
2223                 // put cursor in front of inset.
2224                 if (!setCursorFromInset(inset)) {
2225                         LASSERT(false, break);
2226                 }
2227                 cur.recordUndo();
2228                 FuncRequest fr(LFUN_INSET_MODIFY, cmd.argument());
2229                 inset->dispatch(cur, fr);
2230                 dr.screenUpdate(cur.result().screenUpdate());
2231                 if (cur.result().needBufferUpdate())
2232                         dr.forceBufferUpdate();
2233                 break;
2234         }
2235
2236         // FIXME:
2237         // The change of language of buffer belongs to the Buffer class.
2238         // We have to do it here because we need a cursor for Undo.
2239         // When Undo::recordUndoBufferParams() is implemented someday
2240         // LFUN_BUFFER_LANGUAGE should be handled by the Buffer class.
2241         case LFUN_BUFFER_LANGUAGE: {
2242                 Language const * oldL = buffer_.params().language;
2243                 Language const * newL = languages.getLanguage(argument);
2244                 if (!newL || oldL == newL)
2245                         break;
2246                 if (oldL->rightToLeft() == newL->rightToLeft()) {
2247                         cur.recordUndoFullBuffer();
2248                         buffer_.changeLanguage(oldL, newL);
2249                         cur.setCurrentFont();
2250                         dr.forceBufferUpdate();
2251                 }
2252                 break;
2253         }
2254
2255         case LFUN_FILE_INSERT_PLAINTEXT_PARA:
2256         case LFUN_FILE_INSERT_PLAINTEXT: {
2257                 bool const as_paragraph = (act == LFUN_FILE_INSERT_PLAINTEXT_PARA);
2258                 string const fname = to_utf8(cmd.argument());
2259                 if (!FileName::isAbsolute(fname))
2260                         dr.setMessage(_("Absolute filename expected."));
2261                 else
2262                         insertPlaintextFile(FileName(fname), as_paragraph);
2263                 break;
2264         }
2265
2266         case LFUN_COPY:
2267                 cap::copySelection(cur);
2268                 cur.message(_("Copy"));
2269                 break;
2270
2271         default:
2272                 // OK, so try the Buffer itself...
2273                 buffer_.dispatch(cmd, dr);
2274                 dispatched = dr.dispatched();
2275                 break;
2276         }
2277
2278         buffer_.undo().endUndoGroup();
2279         dr.dispatched(dispatched);
2280
2281         // NOTE: The code below is copied from Cursor::dispatch. If you
2282         // need to modify this, please update the other one too.
2283
2284         // notify insets we just entered/left
2285         if (cursor() != old) {
2286                 old.beginUndoGroup();
2287                 old.fixIfBroken();
2288                 bool badcursor = notifyCursorLeavesOrEnters(old, cursor());
2289                 if (badcursor) {
2290                         cursor().fixIfBroken();
2291                         resetInlineCompletionPos();
2292                 }
2293                 old.endUndoGroup();
2294         }
2295 }
2296
2297
2298 docstring BufferView::requestSelection()
2299 {
2300         Cursor & cur = d->cursor_;
2301
2302         LYXERR(Debug::SELECTION, "requestSelection: cur.selection: " << cur.selection());
2303         if (!cur.selection()) {
2304                 d->xsel_cache_.set = false;
2305                 return docstring();
2306         }
2307
2308         LYXERR(Debug::SELECTION, "requestSelection: xsel_cache.set: " << d->xsel_cache_.set);
2309         if (!d->xsel_cache_.set ||
2310             cur.top() != d->xsel_cache_.cursor ||
2311             cur.realAnchor().top() != d->xsel_cache_.anchor)
2312         {
2313                 d->xsel_cache_.cursor = cur.top();
2314                 d->xsel_cache_.anchor = cur.realAnchor().top();
2315                 d->xsel_cache_.set = cur.selection();
2316                 return cur.selectionAsString(false);
2317         }
2318         return docstring();
2319 }
2320
2321
2322 void BufferView::clearSelection()
2323 {
2324         d->cursor_.clearSelection();
2325         // Clear the selection buffer. Otherwise a subsequent
2326         // middle-mouse-button paste would use the selection buffer,
2327         // not the more current external selection.
2328         cap::clearSelection();
2329         d->xsel_cache_.set = false;
2330         // The buffer did not really change, but this causes the
2331         // redraw we need because we cleared the selection above.
2332         buffer_.changed(false);
2333 }
2334
2335
2336 void BufferView::resize(int width, int height)
2337 {
2338         // Update from work area
2339         width_ = width;
2340         height_ = height;
2341
2342         // Clear the paragraph height cache.
2343         d->par_height_.clear();
2344         // Redo the metrics.
2345         updateMetrics();
2346 }
2347
2348
2349 Inset const * BufferView::getCoveringInset(Text const & text,
2350                 int x, int y) const
2351 {
2352         TextMetrics & tm = d->text_metrics_[&text];
2353         Inset * inset = tm.checkInsetHit(x, y);
2354         if (!inset)
2355                 return nullptr;
2356
2357         if (!inset->descendable(*this))
2358                 // No need to go further down if the inset is not
2359                 // descendable.
2360                 return inset;
2361
2362         size_t cell_number = inset->nargs();
2363         // Check all the inner cell.
2364         for (size_t i = 0; i != cell_number; ++i) {
2365                 Text const * inner_text = inset->getText(i);
2366                 if (inner_text) {
2367                         // Try deeper.
2368                         Inset const * inset_deeper =
2369                                 getCoveringInset(*inner_text, x, y);
2370                         if (inset_deeper)
2371                                 return inset_deeper;
2372                 }
2373         }
2374
2375         return inset;
2376 }
2377
2378
2379 void BufferView::updateHoveredInset() const
2380 {
2381         // Get inset under mouse, if there is one.
2382         int const x = d->mouse_position_cache_.x_;
2383         int const y = d->mouse_position_cache_.y_;
2384         Inset const * covering_inset = getCoveringInset(buffer_.text(), x, y);
2385
2386         d->clickable_inset_ = covering_inset && covering_inset->clickable(*this, x, y);
2387
2388         if (covering_inset == d->last_inset_)
2389                 // Same inset, no need to do anything...
2390                 return;
2391
2392         bool need_redraw = false;
2393         if (d->last_inset_) {
2394                 // Remove the hint on the last hovered inset (if any).
2395                 need_redraw |= d->last_inset_->setMouseHover(this, false);
2396                 d->last_inset_ = nullptr;
2397         }
2398
2399         if (covering_inset && covering_inset->setMouseHover(this, true)) {
2400                 need_redraw = true;
2401                 // Only the insets that accept the hover state, do
2402                 // clear the last_inset_, so only set the last_inset_
2403                 // member if the hovered setting is accepted.
2404                 d->last_inset_ = covering_inset;
2405         }
2406
2407         if (need_redraw) {
2408                 LYXERR(Debug::PAINTING, "Mouse hover detected at: ("
2409                                 << d->mouse_position_cache_.x_ << ", "
2410                                 << d->mouse_position_cache_.y_ << ")");
2411
2412                 d->update_strategy_ = DecorationUpdate;
2413
2414                 // This event (moving without mouse click) is not passed further.
2415                 // This should be changed if it is further utilized.
2416                 buffer_.changed(false);
2417         }
2418 }
2419
2420
2421 void BufferView::clearLastInset(Inset * inset) const
2422 {
2423         if (d->last_inset_ != inset) {
2424                 LYXERR0("Wrong last_inset!");
2425                 LATTEST(false);
2426         }
2427         d->last_inset_ = nullptr;
2428 }
2429
2430
2431 void BufferView::mouseEventDispatch(FuncRequest const & cmd0)
2432 {
2433         //lyxerr << "[ cmd0 " << cmd0 << "]" << endl;
2434
2435         // This is only called for mouse related events including
2436         // LFUN_FILE_OPEN generated by drag-and-drop.
2437         FuncRequest cmd = cmd0;
2438
2439         Cursor old = cursor();
2440         Cursor cur(*this);
2441         cur.push(buffer_.inset());
2442         cur.selection(d->cursor_.selection());
2443
2444         // Either the inset under the cursor or the
2445         // surrounding Text will handle this event.
2446
2447         // make sure we stay within the screen...
2448         cmd.set_y(min(max(cmd.y(), -1), height_));
2449
2450         d->mouse_position_cache_.x_ = cmd.x();
2451         d->mouse_position_cache_.y_ = cmd.y();
2452
2453         if (cmd.action() == LFUN_MOUSE_MOTION && cmd.button() == mouse_button::none) {
2454                 updateHoveredInset();
2455                 return;
2456         }
2457
2458         // Build temporary cursor.
2459         Inset * inset = d->text_metrics_[&buffer_.text()].editXY(cur, cmd.x(), cmd.y());
2460         if (inset) {
2461                 // If inset is not editable, cur.pos() might point behind the
2462                 // inset (depending on cmd.x(), cmd.y()). This is needed for
2463                 // editing to fix bug 9628, but e.g. the context menu needs a
2464                 // cursor in front of the inset.
2465                 if ((inset->hasSettings() || !inset->contextMenuName().empty()
2466                      || inset->lyxCode() == SEPARATOR_CODE) &&
2467                     cur.nextInset() != inset && cur.prevInset() == inset)
2468                         cur.posBackward();
2469         } else if (cur.inTexted() && cur.pos()
2470                         && cur.paragraph().isEnvSeparator(cur.pos() - 1)) {
2471                 // Always place cursor in front of a separator inset.
2472                 cur.posBackward();
2473         }
2474
2475         // Put anchor at the same position.
2476         cur.resetAnchor();
2477
2478         cur.beginUndoGroup();
2479
2480         // Try to dispatch to an non-editable inset near this position
2481         // via the temp cursor. If the inset wishes to change the real
2482         // cursor it has to do so explicitly by using
2483         //  cur.bv().cursor() = cur;  (or similar)
2484         if (inset)
2485                 inset->dispatch(cur, cmd);
2486
2487         // Now dispatch to the temporary cursor. If the real cursor should
2488         // be modified, the inset's dispatch has to do so explicitly.
2489         if (!inset || !cur.result().dispatched())
2490                 cur.dispatch(cmd);
2491
2492         // Notify left insets
2493         if (cur != old) {
2494                 bool badcursor = old.fixIfBroken() | cur.fixIfBroken();
2495                 badcursor |= notifyCursorLeavesOrEnters(old, cur);
2496                 if (badcursor)
2497                         cursor().fixIfBroken();
2498         }
2499
2500         cur.endUndoGroup();
2501
2502         // Do we have a selection?
2503         theSelection().haveSelection(cursor().selection());
2504
2505         if (cur.needBufferUpdate() || buffer().needUpdate()) {
2506                 cur.clearBufferUpdate();
2507                 buffer().updateBuffer();
2508         }
2509
2510         // If the command has been dispatched,
2511         if (cur.result().dispatched() || cur.result().screenUpdate())
2512                 processUpdateFlags(cur.result().screenUpdate());
2513 }
2514
2515
2516 int BufferView::minVisiblePart()
2517 {
2518         return 2 * defaultRowHeight();
2519 }
2520
2521
2522 int BufferView::scroll(int pixels)
2523 {
2524         if (pixels > 0)
2525                 return scrollDown(pixels);
2526         if (pixels < 0)
2527                 return scrollUp(-pixels);
2528         return 0;
2529 }
2530
2531
2532 int BufferView::scrollDown(int pixels)
2533 {
2534         Text * text = &buffer_.text();
2535         TextMetrics & tm = d->text_metrics_[text];
2536         int const ymax = height_ + pixels;
2537         while (true) {
2538                 pair<pit_type, ParagraphMetrics const *> last = tm.last();
2539                 int bottom_pos = last.second->position() + last.second->descent();
2540                 if (lyxrc.scroll_below_document)
2541                         bottom_pos += height_ - minVisiblePart();
2542                 if (last.first + 1 == int(text->paragraphs().size())) {
2543                         if (bottom_pos <= height_)
2544                                 return 0;
2545                         pixels = min(pixels, bottom_pos - height_);
2546                         break;
2547                 }
2548                 if (bottom_pos > ymax)
2549                         break;
2550                 tm.newParMetricsDown();
2551         }
2552         d->anchor_ypos_ -= pixels;
2553         return -pixels;
2554 }
2555
2556
2557 int BufferView::scrollUp(int pixels)
2558 {
2559         Text * text = &buffer_.text();
2560         TextMetrics & tm = d->text_metrics_[text];
2561         int ymin = - pixels;
2562         while (true) {
2563                 pair<pit_type, ParagraphMetrics const *> first = tm.first();
2564                 int top_pos = first.second->position() - first.second->ascent();
2565                 if (first.first == 0) {
2566                         if (top_pos >= 0)
2567                                 return 0;
2568                         pixels = min(pixels, - top_pos);
2569                         break;
2570                 }
2571                 if (top_pos < ymin)
2572                         break;
2573                 tm.newParMetricsUp();
2574         }
2575         d->anchor_ypos_ += pixels;
2576         return pixels;
2577 }
2578
2579
2580 bool BufferView::setCursorFromRow(int row)
2581 {
2582         TexRow::TextEntry start, end;
2583         tie(start,end) = buffer_.texrow().getEntriesFromRow(row);
2584         LYXERR(Debug::LATEX,
2585                "setCursorFromRow: for row " << row << ", TexRow has found "
2586                "start (id=" << start.id << ",pos=" << start.pos << "), "
2587                "end (id=" << end.id << ",pos=" << end.pos << ")");
2588         return setCursorFromEntries(start, end);
2589 }
2590
2591
2592 bool BufferView::setCursorFromEntries(TexRow::TextEntry start,
2593                                       TexRow::TextEntry end)
2594 {
2595         DocIterator dit_start, dit_end;
2596         tie(dit_start,dit_end) =
2597                 TexRow::getDocIteratorsFromEntries(start, end, buffer_);
2598         if (!dit_start)
2599                 return false;
2600         // Setting selection start
2601         d->cursor_.clearSelection();
2602         setCursor(dit_start);
2603         // Setting selection end
2604         if (dit_end) {
2605                 d->cursor_.resetAnchor();
2606                 setCursorSelectionTo(dit_end);
2607         }
2608         return true;
2609 }
2610
2611
2612 bool BufferView::setCursorFromInset(Inset const * inset)
2613 {
2614         // are we already there?
2615         if (cursor().nextInset() == inset)
2616                 return true;
2617
2618         // Inset is not at cursor position. Find it in the document.
2619         Cursor cur(*this);
2620         cur.reset();
2621         while (cur && cur.nextInset() != inset)
2622                 cur.forwardInset();
2623
2624         if (cur) {
2625                 setCursor(cur);
2626                 return true;
2627         }
2628         return false;
2629 }
2630
2631
2632 void BufferView::gotoLabel(docstring const & label)
2633 {
2634         FuncRequest action;
2635         bool have_inactive = false;
2636         for (Buffer const * buf : buffer().allRelatives()) {
2637                 // find label
2638                 for (TocItem const & item : *buf->tocBackend().toc("label")) {
2639                         if (label == item.str() && item.isOutput()) {
2640                                 lyx::dispatch(item.action());
2641                                 return;
2642                         }
2643                         // If we find an inactive label, save it for the case
2644                         // that no active one is there
2645                         if (label == item.str() && !have_inactive) {
2646                                 have_inactive = true;
2647                                 action = item.action();
2648                         }
2649                 }
2650         }
2651         // We only found an inactive label. Go there.
2652         if (have_inactive)
2653                 lyx::dispatch(action);
2654 }
2655
2656
2657 TextMetrics const & BufferView::textMetrics(Text const * t) const
2658 {
2659         return const_cast<BufferView *>(this)->textMetrics(t);
2660 }
2661
2662
2663 TextMetrics & BufferView::textMetrics(Text const * t)
2664 {
2665         LBUFERR(t);
2666         TextMetricsCache::iterator tmc_it  = d->text_metrics_.find(t);
2667         if (tmc_it == d->text_metrics_.end()) {
2668                 tmc_it = d->text_metrics_.emplace(std::piecewise_construct,
2669                                 std::forward_as_tuple(t),
2670                                 std::forward_as_tuple(this, const_cast<Text *>(t))).first;
2671         }
2672         return tmc_it->second;
2673 }
2674
2675
2676 ParagraphMetrics const & BufferView::parMetrics(Text const * t,
2677                 pit_type pit) const
2678 {
2679         return textMetrics(t).parMetrics(pit);
2680 }
2681
2682
2683 int BufferView::workHeight() const
2684 {
2685         return height_;
2686 }
2687
2688
2689 void BufferView::setCursor(DocIterator const & dit)
2690 {
2691         d->cursor_.reset();
2692         size_t const n = dit.depth();
2693         for (size_t i = 0; i < n; ++i)
2694                 dit[i].inset().edit(d->cursor_, true);
2695
2696         d->cursor_.setCursor(dit);
2697         d->cursor_.selection(false);
2698         d->cursor_.setCurrentFont();
2699         // FIXME
2700         // It seems on general grounds as if this is probably needed, but
2701         // it is not yet clear.
2702         // See bug #7394 and r38388.
2703         // d->cursor.resetAnchor();
2704 }
2705
2706
2707 void BufferView::setCursorSelectionTo(DocIterator const & dit)
2708 {
2709         size_t const n = dit.depth();
2710         for (size_t i = 0; i < n; ++i)
2711                 dit[i].inset().edit(d->cursor_, true);
2712
2713         d->cursor_.selection(true);
2714         d->cursor_.setCursorSelectionTo(dit);
2715         d->cursor_.setCurrentFont();
2716 }
2717
2718
2719 bool BufferView::checkDepm(Cursor & cur, Cursor & old)
2720 {
2721         // Would be wrong to delete anything if we have a selection.
2722         if (cur.selection())
2723                 return false;
2724
2725         bool need_anchor_change = false;
2726         bool changed = Text::deleteEmptyParagraphMechanism(cur, old,
2727                 need_anchor_change);
2728
2729         if (need_anchor_change)
2730                 cur.resetAnchor();
2731
2732         if (!changed)
2733                 return false;
2734
2735         d->cursor_ = cur;
2736
2737         // we would rather not do this here, but it needs to be done before
2738         // the changed() signal is sent.
2739         buffer_.updateBuffer();
2740
2741         buffer_.changed(true);
2742         return true;
2743 }
2744
2745
2746 bool BufferView::mouseSetCursor(Cursor & cur, bool const select)
2747 {
2748         LASSERT(&cur.bv() == this, return false);
2749
2750         if (!select)
2751                 // this event will clear selection so we save selection for
2752                 // persistent selection
2753                 cap::saveSelection(cursor());
2754
2755         d->cursor_.macroModeClose();
2756         // If a macro has been finalized, the cursor might have been broken
2757         cur.fixIfBroken();
2758
2759         // Has the cursor just left the inset?
2760         bool const leftinset = (&d->cursor_.inset() != &cur.inset());
2761         if (leftinset)
2762                 d->cursor_.fixIfBroken();
2763
2764         // do the dEPM magic if needed
2765         // FIXME: (1) move this to InsetText::notifyCursorLeaves?
2766         // FIXME: (2) if we had a working InsetText::notifyCursorLeaves,
2767         // the leftinset bool would not be necessary (badcursor instead).
2768         bool update = leftinset;
2769
2770         if (select) {
2771                 d->cursor_.setSelection();
2772                 d->cursor_.setCursorSelectionTo(cur);
2773         } else {
2774                 if (d->cursor_.inTexted())
2775                         update |= checkDepm(cur, d->cursor_);
2776                 d->cursor_.resetAnchor();
2777                 d->cursor_.setCursor(cur);
2778                 d->cursor_.clearSelection();
2779         }
2780         d->cursor_.boundary(cur.boundary());
2781         d->cursor_.finishUndo();
2782         d->cursor_.setCurrentFont();
2783         if (update)
2784                 cur.forceBufferUpdate();
2785         return update;
2786 }
2787
2788
2789 void BufferView::putSelectionAt(DocIterator const & cur,
2790                                 int length, bool backwards)
2791 {
2792         d->cursor_.clearSelection();
2793
2794         setCursor(cur);
2795
2796         if (length) {
2797                 if (backwards) {
2798                         d->cursor_.pos() += length;
2799                         d->cursor_.setSelection(d->cursor_, -length);
2800                 } else
2801                         d->cursor_.setSelection(d->cursor_, length);
2802         }
2803 }
2804
2805
2806 bool BufferView::selectIfEmpty(DocIterator & cur)
2807 {
2808         if ((cur.inTexted() && !cur.paragraph().empty())
2809             || (cur.inMathed() && !cur.cell().empty()))
2810                 return false;
2811
2812         pit_type const beg_pit = cur.pit();
2813         if (beg_pit > 0) {
2814                 // The paragraph associated to this item isn't
2815                 // the first one, so it can be selected
2816                 cur.backwardPos();
2817         } else {
2818                 // We have to resort to select the space between the
2819                 // end of this item and the begin of the next one
2820                 cur.forwardPos();
2821         }
2822         if (cur.empty()) {
2823                 // If it is the only item in the document,
2824                 // nothing can be selected
2825                 return false;
2826         }
2827         pit_type const end_pit = cur.pit();
2828         pos_type const end_pos = cur.pos();
2829         d->cursor_.clearSelection();
2830         d->cursor_.reset();
2831         d->cursor_.setCursor(cur);
2832         d->cursor_.pit() = beg_pit;
2833         d->cursor_.pos() = 0;
2834         d->cursor_.selection(false);
2835         d->cursor_.resetAnchor();
2836         d->cursor_.pit() = end_pit;
2837         d->cursor_.pos() = end_pos;
2838         d->cursor_.setSelection();
2839         return true;
2840 }
2841
2842
2843 Cursor & BufferView::cursor()
2844 {
2845         return d->cursor_;
2846 }
2847
2848
2849 Cursor const & BufferView::cursor() const
2850 {
2851         return d->cursor_;
2852 }
2853
2854
2855 bool BufferView::singleParUpdate()
2856 {
2857         Text & buftext = buffer_.text();
2858         pit_type const bottom_pit = d->cursor_.bottom().pit();
2859         TextMetrics & tm = textMetrics(&buftext);
2860         Dimension const old_dim = tm.parMetrics(bottom_pit).dim();
2861
2862         // make sure inline completion pointer is ok
2863         if (d->inlineCompletionPos_.fixIfBroken())
2864                 d->inlineCompletionPos_ = DocIterator();
2865
2866         // In Single Paragraph mode, rebreak only
2867         // the (main text, not inset!) paragraph containing the cursor.
2868         // (if this paragraph contains insets etc., rebreaking will
2869         // recursively descend)
2870         tm.redoParagraph(bottom_pit);
2871         ParagraphMetrics & pm = tm.parMetrics(bottom_pit);
2872         if (pm.height() != old_dim.height()) {
2873                 // Paragraph height has changed so we cannot proceed to
2874                 // the singlePar optimisation.
2875                 return false;
2876         }
2877         // Since position() points to the baseline of the first row, we
2878         // may have to update it. See ticket #11601 for an example where
2879         // the height does not change but the ascent does.
2880         pm.setPosition(pm.position() - old_dim.ascent() + pm.ascent());
2881
2882         tm.updatePosCache(bottom_pit);
2883
2884         LYXERR(Debug::PAINTING, "\ny1: " << pm.position() - pm.ascent()
2885                 << " y2: " << pm.position() + pm.descent()
2886                 << " pit: " << bottom_pit
2887                 << " singlepar: 1");
2888         return true;
2889 }
2890
2891
2892 void BufferView::updateMetrics()
2893 {
2894         updateMetrics(d->update_flags_);
2895         d->update_strategy_ = FullScreenUpdate;
2896 }
2897
2898
2899 void BufferView::updateMetrics(Update::flags & update_flags)
2900 {
2901         if (height_ == 0 || width_ == 0)
2902                 return;
2903
2904         Text & buftext = buffer_.text();
2905         pit_type const npit = int(buftext.paragraphs().size());
2906
2907         // Clear out the position cache in case of full screen redraw,
2908         d->coord_cache_.clear();
2909         d->math_rows_.clear();
2910
2911         // Clear out paragraph metrics to avoid having invalid metrics
2912         // in the cache from paragraphs not relayouted below
2913         // The complete text metrics will be redone.
2914         d->text_metrics_.clear();
2915
2916         TextMetrics & tm = textMetrics(&buftext);
2917
2918         // make sure inline completion pointer is ok
2919         if (d->inlineCompletionPos_.fixIfBroken())
2920                 d->inlineCompletionPos_ = DocIterator();
2921
2922         if (d->anchor_pit_ >= npit)
2923                 // The anchor pit must have been deleted...
2924                 d->anchor_pit_ = npit - 1;
2925
2926         // Rebreak anchor paragraph.
2927         tm.redoParagraph(d->anchor_pit_);
2928         ParagraphMetrics & anchor_pm = tm.parMetrics(d->anchor_pit_);
2929
2930         // position anchor
2931         if (d->anchor_pit_ == 0) {
2932                 int scrollRange = d->scrollbarParameters_.max - d->scrollbarParameters_.min;
2933
2934                 // Complete buffer visible? Then it's easy.
2935                 if (scrollRange == 0)
2936                         d->anchor_ypos_ = anchor_pm.ascent();
2937                 else {
2938                         // avoid empty space above the first row
2939                         d->anchor_ypos_ = min(d->anchor_ypos_, anchor_pm.ascent());
2940                 }
2941         }
2942         anchor_pm.setPosition(d->anchor_ypos_);
2943         tm.updatePosCache(d->anchor_pit_);
2944
2945         LYXERR(Debug::PAINTING, "metrics: "
2946                 << " anchor pit = " << d->anchor_pit_
2947                 << " anchor ypos = " << d->anchor_ypos_);
2948
2949         // Redo paragraphs above anchor if necessary.
2950         int y1 = d->anchor_ypos_ - anchor_pm.ascent();
2951         // We are now just above the anchor paragraph.
2952         pit_type pit1 = d->anchor_pit_ - 1;
2953         for (; pit1 >= 0 && y1 >= 0; --pit1) {
2954                 tm.redoParagraph(pit1);
2955                 ParagraphMetrics & pm = tm.parMetrics(pit1);
2956                 y1 -= pm.descent();
2957                 // Save the paragraph position in the cache.
2958                 pm.setPosition(y1);
2959                 tm.updatePosCache(pit1);
2960                 y1 -= pm.ascent();
2961         }
2962
2963         // Redo paragraphs below the anchor if necessary.
2964         int y2 = d->anchor_ypos_ + anchor_pm.descent();
2965         // We are now just below the anchor paragraph.
2966         pit_type pit2 = d->anchor_pit_ + 1;
2967         for (; pit2 < npit && y2 <= height_; ++pit2) {
2968                 tm.redoParagraph(pit2);
2969                 ParagraphMetrics & pm = tm.parMetrics(pit2);
2970                 y2 += pm.ascent();
2971                 // Save the paragraph position in the cache.
2972                 pm.setPosition(y2);
2973                 tm.updatePosCache(pit2);
2974                 y2 += pm.descent();
2975         }
2976
2977         LYXERR(Debug::PAINTING, "Metrics: "
2978                 << " anchor pit = " << d->anchor_pit_
2979                 << " anchor ypos = " << d->anchor_ypos_
2980                 << " y1 = " << y1
2981                 << " y2 = " << y2
2982                 << " pit1 = " << pit1
2983                 << " pit2 = " << pit2);
2984
2985         // metrics is done, full drawing is necessary now
2986         update_flags = (update_flags & ~Update::Force) | Update::ForceDraw;
2987
2988         // Now update the positions of insets in the cache.
2989         updatePosCache();
2990
2991         if (lyxerr.debugging(Debug::WORKAREA)) {
2992                 LYXERR(Debug::WORKAREA, "BufferView::updateMetrics");
2993                 d->coord_cache_.dump();
2994         }
2995 }
2996
2997
2998 void BufferView::updatePosCache()
2999 {
3000         // this is the "nodraw" drawing stage: only set the positions of the
3001         // insets in metrics cache.
3002         frontend::NullPainter np;
3003         draw(np, false);
3004 }
3005
3006
3007 void BufferView::insertLyXFile(FileName const & fname, bool const ignorelang)
3008 {
3009         LASSERT(d->cursor_.inTexted(), return);
3010
3011         // Get absolute path of file and add ".lyx"
3012         // to the filename if necessary
3013         FileName filename = fileSearch(string(), fname.absFileName(), "lyx");
3014
3015         docstring const disp_fn = makeDisplayPath(filename.absFileName());
3016         // emit message signal.
3017         message(bformat(_("Inserting document %1$s..."), disp_fn));
3018
3019         docstring res;
3020         Buffer buf(filename.absFileName(), false);
3021         if (buf.loadLyXFile() == Buffer::ReadSuccess) {
3022                 ErrorList & el = buffer_.errorList("Parse");
3023                 // Copy the inserted document error list into the current buffer one.
3024                 el = buf.errorList("Parse");
3025                 ParagraphList & pars = buf.paragraphs();
3026                 if (ignorelang)
3027                         // set main language of imported file to context language
3028                         buf.changeLanguage(buf.language(), d->cursor_.getFont().language());
3029                 buffer_.undo().recordUndo(d->cursor_);
3030                 cap::pasteParagraphList(d->cursor_, pars,
3031                                         buf.params().documentClassPtr(),
3032                                         buf.params().authors(), el);
3033                 res = _("Document %1$s inserted.");
3034         } else {
3035                 res = _("Could not insert document %1$s");
3036         }
3037
3038         buffer_.changed(true);
3039         // emit message signal.
3040         message(bformat(res, disp_fn));
3041 }
3042
3043
3044 Point BufferView::coordOffset(DocIterator const & dit) const
3045 {
3046         int x = 0;
3047         int y = 0;
3048         int lastw = 0;
3049
3050         // Addup contribution of nested insets, from inside to outside,
3051         // keeping the outer paragraph for a special handling below
3052         for (size_t i = dit.depth() - 1; i >= 1; --i) {
3053                 CursorSlice const & sl = dit[i];
3054                 int xx = 0;
3055                 int yy = 0;
3056
3057                 // get relative position inside sl.inset()
3058                 sl.inset().cursorPos(*this, sl, dit.boundary() && (i + 1 == dit.depth()), xx, yy);
3059
3060                 // Make relative position inside of the edited inset relative to sl.inset()
3061                 x += xx;
3062                 y += yy;
3063
3064                 // In case of an RTL inset, the edited inset will be positioned to the left
3065                 // of xx:yy
3066                 if (sl.text()) {
3067                         bool boundary_i = dit.boundary() && i + 1 == dit.depth();
3068                         bool rtl = textMetrics(sl.text()).isRTL(sl, boundary_i);
3069                         if (rtl)
3070                                 x -= lastw;
3071                 }
3072
3073                 // remember width for the case that sl.inset() is positioned in an RTL inset
3074                 lastw = sl.inset().dimension(*this).wid;
3075
3076                 //lyxerr << "Cursor::getPos, i: "
3077                 // << i << " x: " << xx << " y: " << y << endl;
3078         }
3079
3080         // Add contribution of initial rows of outermost paragraph
3081         CursorSlice const & sl = dit[0];
3082         TextMetrics const & tm = textMetrics(sl.text());
3083         ParagraphMetrics const & pm = tm.parMetrics(sl.pit());
3084
3085         LBUFERR(!pm.rows().empty());
3086         y -= pm.rows()[0].ascent();
3087 #if 1
3088         // FIXME: document this mess
3089         size_t rend;
3090         if (sl.pos() > 0 && dit.depth() == 1) {
3091                 int pos = sl.pos();
3092                 if (pos && dit.boundary())
3093                         --pos;
3094 //              lyxerr << "coordOffset: boundary:" << dit.boundary() << " depth:" << dit.depth() << " pos:" << pos << " sl.pos:" << sl.pos() << endl;
3095                 rend = pm.pos2row(pos);
3096         } else
3097                 rend = pm.pos2row(sl.pos());
3098 #else
3099         size_t rend = pm.pos2row(sl.pos());
3100 #endif
3101         for (size_t rit = 0; rit != rend; ++rit)
3102                 y += pm.rows()[rit].height();
3103         y += pm.rows()[rend].ascent();
3104
3105         TextMetrics const & bottom_tm = textMetrics(dit.bottom().text());
3106
3107         // Make relative position from the nested inset now bufferview absolute.
3108         int xx = bottom_tm.cursorX(dit.bottom(), dit.boundary() && dit.depth() == 1);
3109         x += xx;
3110
3111         // In the RTL case place the nested inset at the left of the cursor in
3112         // the outer paragraph
3113         bool boundary_1 = dit.boundary() && 1 == dit.depth();
3114         bool rtl = bottom_tm.isRTL(dit.bottom(), boundary_1);
3115         if (rtl)
3116                 x -= lastw;
3117
3118         return Point(x, y);
3119 }
3120
3121
3122 Point BufferView::getPos(DocIterator const & dit) const
3123 {
3124         if (!paragraphVisible(dit))
3125                 return Point(-1, -1);
3126
3127         CursorSlice const & bot = dit.bottom();
3128         TextMetrics const & tm = textMetrics(bot.text());
3129
3130         // offset from outer paragraph
3131         Point p = coordOffset(dit);
3132         p.y_ += tm.parMetrics(bot.pit()).position();
3133         return p;
3134 }
3135
3136
3137 bool BufferView::paragraphVisible(DocIterator const & dit) const
3138 {
3139         CursorSlice const & bot = dit.bottom();
3140         TextMetrics const & tm = textMetrics(bot.text());
3141
3142         return tm.contains(bot.pit());
3143 }
3144
3145
3146 void BufferView::caretPosAndDim(Point & p, Dimension & dim) const
3147 {
3148         Cursor const & cur = cursor();
3149         if (cur.inMathed()) {
3150                 MathRow const & mrow = mathRow(&cur.cell());
3151                 dim = mrow.caret_dim;
3152         } else {
3153                 Font const font = cur.real_current_font;
3154                 frontend::FontMetrics const & fm = theFontMetrics(font);
3155                 dim.wid = fm.lineWidth();
3156                 dim.asc = fm.maxAscent();
3157                 dim.des = fm.maxDescent();
3158         }
3159         if (lyxrc.cursor_width > 0)
3160                 dim.wid = lyxrc.cursor_width;
3161
3162         p = getPos(cur);
3163         // center fat carets horizontally
3164         p.x_ -= dim.wid / 2;
3165         // p is top-left
3166         p.y_ -= dim.asc;
3167 }
3168
3169
3170 void BufferView::buildCaretGeometry(bool complet)
3171 {
3172         Point p;
3173         Dimension dim;
3174         caretPosAndDim(p, dim);
3175
3176         Cursor const & cur = d->cursor_;
3177         Font const & realfont = cur.real_current_font;
3178         frontend::FontMetrics const & fm = theFontMetrics(realfont.fontInfo());
3179         bool const isrtl = realfont.isVisibleRightToLeft();
3180         int const dir = isrtl ? -1 : 1;
3181
3182         frontend::CaretGeometry & cg = d->caret_geometry_;
3183         cg.shapes.clear();
3184
3185         // The caret itself, slanted for italics in text edit mode except
3186         // for selections because the selection rect does not slant
3187         bool const slant = fm.italic() && cur.inTexted() && !cur.selection();
3188         double const slope = slant ? fm.italicSlope() : 0;
3189         cg.shapes.push_back(
3190                 {{iround(p.x_ + dim.asc * slope), p.y_},
3191                  {iround(p.x_ - dim.des * slope), p.y_ + dim.height()},
3192                  {iround(p.x_ + dir * dim.wid - dim.des * slope), p.y_ + dim.height()},
3193                  {iround(p.x_ + dir * dim.wid + dim.asc * slope), p.y_}}
3194                 );
3195
3196         // The language indicator _| (if needed)
3197         Language const * doclang = buffer().params().language;
3198         if (!((realfont.language() == doclang && isrtl == doclang->rightToLeft())
3199                   || realfont.language() == latex_language)) {
3200                 int const lx = dim.height() / 3;
3201                 int const xx = iround(p.x_ - dim.des * slope);
3202                 int const yy = p.y_ + dim.height();
3203                 cg.shapes.push_back(
3204                         {{xx, yy - dim.wid},
3205                          {xx + dir * (dim.wid + lx - 1), yy - dim.wid},
3206                          {xx + dir * (dim.wid + lx - 1), yy},
3207                          {xx, yy}}
3208                         );
3209         }
3210
3211         // The completion triangle |> (if needed)
3212         if (complet) {
3213                 int const m = p.y_ + dim.height() / 2;
3214                 int const d = dim.height() / 8;
3215                 // offset for slanted carret
3216                 int const sx = iround((dim.asc - (dim.height() / 2 - d)) * slope);
3217                 // starting position x
3218                 int const xx = p.x_ + dir * dim.wid + sx;
3219                 cg.shapes.push_back(
3220                         {{xx, m - d},
3221                          {xx + dir * d, m},
3222                          {xx, m + d},
3223                          {xx, m + d - dim.wid},
3224                          {xx + dir * d - dim.wid, m},
3225                          {xx, m - d + dim.wid}}
3226                         );
3227         }
3228
3229         // compute extremal x values
3230         cg.left = 1000000;
3231         cg.right = -1000000;
3232         cg.top = 1000000;
3233         cg.bottom = -1000000;
3234         for (auto const & shape : cg.shapes)
3235                 for (Point const & p : shape) {
3236                         cg.left = min(cg.left, p.x_);
3237                         cg.right = max(cg.right, p.x_);
3238                         cg.top = min(cg.top, p.y_);
3239                         cg.bottom = max(cg.bottom, p.y_);
3240                 }
3241 }
3242
3243
3244 frontend::CaretGeometry const &  BufferView::caretGeometry() const
3245 {
3246         return d->caret_geometry_;
3247 }
3248
3249
3250 bool BufferView::caretInView() const
3251 {
3252         if (!paragraphVisible(cursor()))
3253                 return false;
3254         Point p;
3255         Dimension dim;
3256         caretPosAndDim(p, dim);
3257
3258         // does the cursor touch the screen ?
3259         if (p.y_ + dim.height() < 0 || p.y_ >= workHeight())
3260                 return false;
3261         return true;
3262 }
3263
3264
3265 int BufferView::horizScrollOffset() const
3266 {
3267         return d->horiz_scroll_offset_;
3268 }
3269
3270
3271 int BufferView::horizScrollOffset(Text const * text,
3272                                   pit_type pit, pos_type pos) const
3273 {
3274         // Is this a row that is currently scrolled?
3275         if (!d->current_row_slice_.empty()
3276             && &text->inset() == d->current_row_slice_.inset().asInsetText()
3277             && pit ==  d->current_row_slice_.pit()
3278             && pos ==  d->current_row_slice_.pos())
3279                 return d->horiz_scroll_offset_;
3280         return 0;
3281 }
3282
3283
3284 void BufferView::setCurrentRowSlice(CursorSlice const & rowSlice)
3285 {
3286         // nothing to do if the cursor was already on this row
3287         if (d->current_row_slice_ == rowSlice)
3288                 return;
3289
3290         // if the (previous) current row was scrolled, we have to
3291         // remember it in order to repaint it next time.
3292         if (d->horiz_scroll_offset_ != 0) {
3293                 // search the old row in cache and mark it changed
3294                 for (auto & tm_pair : d->text_metrics_) {
3295                         if (&tm_pair.first->inset() == rowSlice.inset().asInsetText()) {
3296                                 tm_pair.second.setRowChanged(rowSlice.pit(), rowSlice.pos());
3297                                 // We found it, no need to continue.
3298                                 break;
3299                         }
3300                 }
3301         }
3302
3303         // Since we changed row, the scroll offset is not valid anymore
3304         d->horiz_scroll_offset_ = 0;
3305         d->current_row_slice_ = rowSlice;
3306 }
3307
3308
3309 void BufferView::checkCursorScrollOffset()
3310 {
3311         CursorSlice rowSlice = d->cursor_.bottom();
3312         TextMetrics const & tm = textMetrics(rowSlice.text());
3313
3314         // Stop if metrics have not been computed yet, since it means
3315         // that there is nothing to do.
3316         if (!tm.contains(rowSlice.pit()))
3317                 return;
3318         ParagraphMetrics const & pm = tm.parMetrics(rowSlice.pit());
3319         Row const & row = pm.getRow(rowSlice.pos(),
3320                                     d->cursor_.boundary() && rowSlice == d->cursor_.top());
3321         rowSlice.pos() = row.pos();
3322
3323         // Set the row on which the cursor lives.
3324         setCurrentRowSlice(rowSlice);
3325
3326         // Current x position of the cursor in pixels
3327         int cur_x = getPos(d->cursor_).x_;
3328
3329         // Horizontal scroll offset of the cursor row in pixels
3330         int offset = d->horiz_scroll_offset_;
3331         int const MARGIN = 2 * theFontMetrics(d->cursor_.real_current_font).em()
3332                            + row.right_margin;
3333         if (row.right_x() <= workWidth() - row.right_margin) {
3334                 // Row is narrower than the work area, no offset needed.
3335                 offset = 0;
3336         } else {
3337                 if (cur_x - offset < MARGIN) {
3338                         // cursor would be too far right
3339                         offset = cur_x - MARGIN;
3340                 } else if (cur_x - offset > workWidth() - MARGIN) {
3341                         // cursor would be too far left
3342                         offset = cur_x - workWidth() + MARGIN;
3343                 }
3344                 // Correct the offset to make sure that we do not scroll too much
3345                 if (offset < 0)
3346                         offset = 0;
3347                 if (row.right_x() - offset < workWidth() - row.right_margin)
3348                         offset = row.right_x() - workWidth() + row.right_margin;
3349         }
3350
3351         //lyxerr << "cur_x=" << cur_x << ", offset=" << offset << ", row.wid=" << row.width() << ", margin=" << MARGIN << endl;
3352
3353         if (offset != d->horiz_scroll_offset_)
3354                 LYXERR(Debug::PAINTING, "Horiz. scroll offset changed from "
3355                        << d->horiz_scroll_offset_ << " to " << offset);
3356
3357         if (d->update_strategy_ == NoScreenUpdate
3358             && offset != d->horiz_scroll_offset_) {
3359                 // FIXME: if one uses SingleParUpdate, then home/end
3360                 // will not work on long rows. Why?
3361                 d->update_strategy_ = FullScreenUpdate;
3362         }
3363
3364         d->horiz_scroll_offset_ = offset;
3365 }
3366
3367
3368 void BufferView::draw(frontend::Painter & pain, bool paint_caret)
3369 {
3370         if (height_ == 0 || width_ == 0)
3371                 return;
3372         LYXERR(Debug::PAINTING, (pain.isNull() ? "\t\t--- START NODRAW ---"
3373                                  : "\t\t*** START DRAWING ***"));
3374         Text & text = buffer_.text();
3375         TextMetrics const & tm = d->text_metrics_[&text];
3376         int const y = tm.first().second->position();
3377         PainterInfo pi(this, pain);
3378
3379         // Check whether the row where the cursor lives needs to be scrolled.
3380         // Update the drawing strategy if needed.
3381         checkCursorScrollOffset();
3382
3383         switch (d->update_strategy_) {
3384
3385         case NoScreenUpdate:
3386                 // no screen painting is actually needed. In nodraw stage
3387                 // however, the different coordinates of insets and paragraphs
3388                 // needs to be updated.
3389                 LYXERR(Debug::PAINTING, "Strategy: NoScreenUpdate");
3390                 if (pain.isNull()) {
3391                         pi.full_repaint = true;
3392                         tm.draw(pi, 0, y);
3393                 } else {
3394                         pi.full_repaint = false;
3395                         tm.draw(pi, 0, y);
3396                 }
3397                 break;
3398
3399         case SingleParUpdate:
3400                 pi.full_repaint = false;
3401                 LYXERR(Debug::PAINTING, "Strategy: SingleParUpdate");
3402                 // In general, only the current row of the outermost paragraph
3403                 // will be redrawn. Particular cases where selection spans
3404                 // multiple paragraph are correctly detected in TextMetrics.
3405                 tm.draw(pi, 0, y);
3406                 break;
3407
3408         case DecorationUpdate:
3409                 // FIXME: We should also distinguish DecorationUpdate to avoid text
3410                 // drawing if possible. This is not possible to do easily right now
3411                 // because of the single backing pixmap.
3412
3413         case FullScreenUpdate:
3414
3415                 LYXERR(Debug::PAINTING,
3416                        ((d->update_strategy_ == FullScreenUpdate)
3417                         ? "Strategy: FullScreenUpdate"
3418                         : "Strategy: DecorationUpdate"));
3419
3420                 // The whole screen, including insets, will be refreshed.
3421                 pi.full_repaint = true;
3422
3423                 // Clear background.
3424                 pain.fillRectangle(0, 0, width_, height_,
3425                         pi.backgroundColor(&buffer_.inset()));
3426
3427                 // Draw everything.
3428                 tm.draw(pi, 0, y);
3429
3430                 // and possibly grey out below
3431                 pair<pit_type, ParagraphMetrics const *> lastpm = tm.last();
3432                 int const y2 = lastpm.second->position() + lastpm.second->descent();
3433
3434                 if (y2 < height_) {
3435                         Color color = buffer().isInternal()
3436                                 ? Color_background : Color_bottomarea;
3437                         pain.fillRectangle(0, y2, width_, height_ - y2, color);
3438                 }
3439                 break;
3440         }
3441         LYXERR(Debug::PAINTING, (pain.isNull() ? "\t\t --- END NODRAW ---"
3442                                 : "\t\t *** END DRAWING ***"));
3443
3444         // The scrollbar needs an update.
3445         // FIXME: does it always? see ticket #11947.
3446         updateScrollbar();
3447
3448         // Normalize anchor for next time
3449         pair<pit_type, ParagraphMetrics const *> firstpm = tm.first();
3450         pair<pit_type, ParagraphMetrics const *> lastpm = tm.last();
3451         for (pit_type pit = firstpm.first; pit <= lastpm.first; ++pit) {
3452                 ParagraphMetrics const & pm = tm.parMetrics(pit);
3453                 if (pm.position() + pm.descent() > 0) {
3454                         if (d->anchor_pit_ != pit
3455                             || d->anchor_ypos_ != pm.position())
3456                                 LYXERR(Debug::PAINTING, "Found new anchor pit = " << d->anchor_pit_
3457                                        << "  anchor ypos = " << d->anchor_ypos_);
3458                         d->anchor_pit_ = pit;
3459                         d->anchor_ypos_ = pm.position();
3460                         break;
3461                 }
3462         }
3463         if (!pain.isNull()) {
3464                 // reset the update flags, everything has been done
3465                 d->update_flags_ = Update::None;
3466         }
3467
3468         // If a caret has to be painted, mark its text row as dirty to
3469         //make sure that it will be repainted on next redraw.
3470         /* FIXME: investigate whether this can be avoided when the cursor did not
3471          * move at all
3472          */
3473         if (paint_caret) {
3474                 Cursor cur(d->cursor_);
3475                 while (cur.depth() > 1) {
3476                         if (!cur.inTexted())
3477                                 break;
3478                         TextMetrics const & tm = textMetrics(cur.text());
3479                         if (d->caret_geometry_.left >= tm.origin().x_
3480                                 && d->caret_geometry_.right <= tm.origin().x_ + tm.dim().width())
3481                                 break;
3482                         cur.pop();
3483                 }
3484                 cur.textRow().changed(true);
3485         }
3486 }
3487
3488
3489 void BufferView::message(docstring const & msg)
3490 {
3491         if (d->gui_)
3492                 d->gui_->message(msg);
3493 }
3494
3495
3496 void BufferView::showDialog(string const & name)
3497 {
3498         if (d->gui_)
3499                 d->gui_->showDialog(name, string());
3500 }
3501
3502
3503 void BufferView::showDialog(string const & name,
3504         string const & data, Inset * inset)
3505 {
3506         if (d->gui_)
3507                 d->gui_->showDialog(name, data, inset);
3508 }
3509
3510
3511 void BufferView::updateDialog(string const & name, string const & data)
3512 {
3513         if (d->gui_)
3514                 d->gui_->updateDialog(name, data);
3515 }
3516
3517
3518 void BufferView::setGuiDelegate(frontend::GuiBufferViewDelegate * gui)
3519 {
3520         d->gui_ = gui;
3521 }
3522
3523
3524 // FIXME: Move this out of BufferView again
3525 docstring BufferView::contentsOfPlaintextFile(FileName const & fname)
3526 {
3527         if (!fname.isReadableFile()) {
3528                 docstring const error = from_ascii(strerror(errno));
3529                 docstring const file = makeDisplayPath(fname.absFileName(), 50);
3530                 docstring const text =
3531                   bformat(_("Could not read the specified document\n"
3532                             "%1$s\ndue to the error: %2$s"), file, error);
3533                 Alert::error(_("Could not read file"), text);
3534                 return docstring();
3535         }
3536
3537         if (!fname.isReadableFile()) {
3538                 docstring const file = makeDisplayPath(fname.absFileName(), 50);
3539                 docstring const text =
3540                   bformat(_("%1$s\n is not readable."), file);
3541                 Alert::error(_("Could not open file"), text);
3542                 return docstring();
3543         }
3544
3545         // FIXME UNICODE: We don't know the encoding of the file
3546         docstring file_content = fname.fileContents("UTF-8");
3547         if (file_content.empty()) {
3548                 Alert::error(_("Reading not UTF-8 encoded file"),
3549                              _("The file is not UTF-8 encoded.\n"
3550                                "It will be read as local 8Bit-encoded.\n"
3551                                "If this does not give the correct result\n"
3552                                "then please change the encoding of the file\n"
3553                                "to UTF-8 with a program other than LyX.\n"));
3554                 file_content = fname.fileContents("local8bit");
3555         }
3556
3557         return normalize_c(file_content);
3558 }
3559
3560
3561 void BufferView::insertPlaintextFile(FileName const & f, bool asParagraph)
3562 {
3563         docstring const tmpstr = contentsOfPlaintextFile(f);
3564
3565         if (tmpstr.empty())
3566                 return;
3567
3568         Cursor & cur = cursor();
3569         cap::replaceSelection(cur);
3570         buffer_.undo().recordUndo(cur);
3571         if (asParagraph)
3572                 cur.innerText()->insertStringAsParagraphs(cur, tmpstr, cur.current_font);
3573         else
3574                 cur.innerText()->insertStringAsLines(cur, tmpstr, cur.current_font);
3575
3576         buffer_.changed(true);
3577 }
3578
3579
3580 docstring const & BufferView::inlineCompletion() const
3581 {
3582         return d->inlineCompletion_;
3583 }
3584
3585
3586 size_t BufferView::inlineCompletionUniqueChars() const
3587 {
3588         return d->inlineCompletionUniqueChars_;
3589 }
3590
3591
3592 DocIterator const & BufferView::inlineCompletionPos() const
3593 {
3594         return d->inlineCompletionPos_;
3595 }
3596
3597
3598 void BufferView::resetInlineCompletionPos()
3599 {
3600         d->inlineCompletionPos_ = DocIterator();
3601 }
3602
3603
3604 bool samePar(DocIterator const & a, DocIterator const & b)
3605 {
3606         if (a.empty() && b.empty())
3607                 return true;
3608         if (a.empty() || b.empty())
3609                 return false;
3610         if (a.depth() != b.depth())
3611                 return false;
3612         return &a.innerParagraph() == &b.innerParagraph();
3613 }
3614
3615
3616 void BufferView::setInlineCompletion(Cursor const & cur, DocIterator const & pos,
3617         docstring const & completion, size_t uniqueChars)
3618 {
3619         uniqueChars = min(completion.size(), uniqueChars);
3620         bool changed = d->inlineCompletion_ != completion
3621                 || d->inlineCompletionUniqueChars_ != uniqueChars;
3622         bool singlePar = true;
3623         d->inlineCompletion_ = completion;
3624         d->inlineCompletionUniqueChars_ = min(completion.size(), uniqueChars);
3625
3626         //lyxerr << "setInlineCompletion pos=" << pos << " completion=" << completion << " uniqueChars=" << uniqueChars << std::endl;
3627
3628         // at new position?
3629         DocIterator const & old = d->inlineCompletionPos_;
3630         if (old != pos) {
3631                 //lyxerr << "inlineCompletionPos changed" << std::endl;
3632                 // old or pos are in another paragraph?
3633                 if ((!samePar(cur, pos) && !pos.empty())
3634                     || (!samePar(cur, old) && !old.empty())) {
3635                         singlePar = false;
3636                         //lyxerr << "different paragraph" << std::endl;
3637                 }
3638                 d->inlineCompletionPos_ = pos;
3639         }
3640
3641         // set update flags
3642         if (changed) {
3643                 if (singlePar && !(cur.result().screenUpdate() & Update::Force))
3644                         cur.screenUpdateFlags(cur.result().screenUpdate() | Update::SinglePar);
3645                 else
3646                         cur.screenUpdateFlags(cur.result().screenUpdate() | Update::Force);
3647         }
3648 }
3649
3650
3651 bool BufferView::clickableInset() const
3652 {
3653         return d->clickable_inset_;
3654 }
3655
3656 } // namespace lyx