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 "BiblioInfo.h"
  24 #include "CoordCache.h"
  25 #include "Cursor.h"
  26 #include "CutAndPaste.h"
  27 #include "DispatchResult.h"
  28 #include "ErrorList.h"
  29 #include "FuncRequest.h"
  30 #include "FuncStatus.h"
  31 #include "Intl.h"
  32 #include "Language.h"
  33 #include "LayoutFile.h"
  34 #include "Lexer.h"
  35 #include "LyX.h"
  36 #include "LyXAction.h"
  37 #include "lyxfind.h"
  38 #include "LyXRC.h"
  39 #include "MetricsInfo.h"
  40 #include "Paragraph.h"
  41 #include "Session.h"
  42 #include "texstream.h"
  43 #include "Text.h"
  44 #include "TextMetrics.h"
  45 #include "TexRow.h"
  46 #include "TocBackend.h"
  47
  48 #include "insets/InsetBibtex.h"
  49 #include "insets/InsetCitation.h"
  50 #include "insets/InsetCommand.h" // ChangeRefs
  51 #include "insets/InsetGraphics.h"
  52 #include "insets/InsetIndex.h"
  53 #include "insets/InsetRef.h"
  54 #include "insets/InsetText.h"
  55
  56 #include "mathed/InsetMathNest.h"
  57 #include "mathed/InsetMathRef.h"
  58 #include "mathed/MathData.h"
  59 #include "mathed/MathRow.h"
  60
  61 #include "frontends/alert.h"
  62 #include "frontends/CaretGeometry.h"
  63 #include "frontends/Delegates.h"
  64 #include "frontends/FontMetrics.h"
  65 #include "frontends/NullPainter.h"
  66 #include "frontends/Painter.h"
  67 #include "frontends/Selection.h"
  68 #include "frontends/Clipboard.h"
  69
  70 #include "support/convert.h"
  71 #include "support/debug.h"
  72 #include "support/docstring.h"
  73 #include "support/docstring_list.h"
  74 #include "support/filetools.h"
  75 #include "support/gettext.h"
  76 #include "support/lassert.h"
  77 #include "support/Length.h"
  78 #include "support/lstrings.h"
  79 #include "support/lyxlib.h"
  80 #include "support/types.h"
  81
  82 #include <algorithm>
  83 #include <cerrno>
  84 #include <cstring>
  85 #include <fstream>
  86 #include <functional>
  87 #include <iterator>
  88 #include <sstream>
  89 #include <vector>
  90
  91 using namespace std;
  92 using namespace lyx::support;
  93
  94 namespace lyx {
  95
  96 namespace Alert = frontend::Alert;
  97
  98 namespace {
  99
 100 /// Return an inset of this class if it exists at the current cursor position
 101 template <class T>
 102 T * getInsetByCode(Cursor const & cur, InsetCode code)
 103 {
 104         DocIterator it = cur;
 105         Inset * inset = it.nextInset();
 106         if (inset && inset->lyxCode() == code)
 107                 return static_cast<T*>(inset);
 108         return nullptr;
 109 }
 110
 111
 112 /// Note that comparing contents can only be used for InsetCommand
 113 bool findNextInset(DocIterator & dit, vector<InsetCode> const & codes,
 114         docstring const & contents)
 115 {
 116         DocIterator tmpdit = dit;
 117
 118         while (tmpdit) {
 119                 Inset const * inset = tmpdit.nextInset();
 120                 if (inset) {
 121                         bool const valid_code = std::find(codes.begin(), codes.end(),
 122                                 inset->lyxCode()) != codes.end();
 123                         InsetCommand const * ic = inset->asInsetCommand();
 124                         bool const same_or_no_contents =  contents.empty()
 125                                 || (ic && (ic->getFirstNonOptParam() == contents));
 126
 127                         if (valid_code && same_or_no_contents) {
 128                                 dit = tmpdit;
 129                                 return true;
 130                         }
 131                 }
 132                 tmpdit.forwardInset();
 133         }
 134
 135         return false;
 136 }
 137
 138
 139 /// Looks for next inset with one of the given codes.
 140 /// Note that same_content can only be used for InsetCommand
 141 bool findInset(DocIterator & dit, vector<InsetCode> const & codes,
 142         bool same_content)
 143 {
 144         docstring contents;
 145         DocIterator tmpdit = dit;
 146         tmpdit.forwardInset();
 147         if (!tmpdit)
 148                 return false;
 149
 150         Inset const * inset = tmpdit.nextInset();
 151         if (same_content && inset) {
 152                 InsetCommand const * ic = inset->asInsetCommand();
 153                 if (ic) {
 154                         bool const valid_code = std::find(codes.begin(), codes.end(),
 155                                 ic->lyxCode()) != codes.end();
 156                         if (valid_code)
 157                                 contents = ic->getFirstNonOptParam();
 158                 }
 159         }
 160
 161         if (!findNextInset(tmpdit, codes, contents)) {
 162                 if (dit.depth() != 1 || dit.pit() != 0 || dit.pos() != 0) {
 163                         inset = &tmpdit.bottom().inset();
 164                         tmpdit = doc_iterator_begin(&inset->buffer(), inset);
 165                         if (!findNextInset(tmpdit, codes, contents))
 166                                 return false;
 167                 } else {
 168                         return false;
 169                 }
 170         }
 171
 172         dit = tmpdit;
 173         return true;
 174 }
 175
 176
 177 /// Moves cursor to the next inset with one of the given codes.
 178 bool gotoInset(BufferView * bv, vector<InsetCode> const & codes,
 179                bool same_content)
 180 {
 181         Cursor tmpcur = bv->cursor();
 182         if (!findInset(tmpcur, codes, same_content)) {
 183                 bv->cursor().message(_("No more insets"));
 184                 return false;
 185         }
 186
 187         tmpcur.clearSelection();
 188         bv->setCursor(tmpcur);
 189         return bv->scrollToCursor(bv->cursor(), false, true);
 190 }
 191
 192
 193 /// A map from a Text to the associated text metrics
 194 typedef map<Text const *, TextMetrics> TextMetricsCache;
 195
 196 enum ScreenUpdateStrategy {
 197         NoScreenUpdate,
 198         SingleParUpdate,
 199         FullScreenUpdate,
 200         DecorationUpdate
 201 };
 202
 203 } // namespace
 204
 205
 206 /////////////////////////////////////////////////////////////////////
 207 //
 208 // BufferView
 209 //
 210 /////////////////////////////////////////////////////////////////////
 211
 212 struct BufferView::Private
 213 {
 214         Private(BufferView & bv) :
 215                 update_strategy_(FullScreenUpdate),
 216                 update_flags_(Update::Force),
 217                 cursor_(bv), anchor_pit_(0), anchor_ypos_(0),
 218                 wh_(0), inlineCompletionUniqueChars_(0),
 219                 last_inset_(nullptr), mouse_position_cache_(),
 220                 gui_(nullptr), bookmark_edit_position_(-1),
 221                 horiz_scroll_offset_(0), clickable_inset_(false)
 222         {
 223                 xsel_cache_.set = false;
 224         }
 225
 226         ///
 227         ScrollbarParameters scrollbarParameters_;
 228         ///
 229         ScreenUpdateStrategy update_strategy_;
 230         ///
 231         Update::flags update_flags_;
 232         ///
 233         CoordCache coord_cache_;
 234         ///
 235         typedef unordered_map<MathData const *, MathRow> MathRows;
 236         MathRows math_rows_;
 237
 238         /// this is used to handle XSelection events in the right manner.
 239         struct {
 240                 CursorSlice cursor;
 241                 CursorSlice anchor;
 242                 bool set;
 243         } xsel_cache_;
 244         ///
 245         Cursor cursor_;
 246         ///
 247         pit_type anchor_pit_;
 248         ///
 249         int anchor_ypos_;
 250         /// Estimated average par height for scrollbar.
 251         int wh_;
 252         ///
 253         vector<int> par_height_;
 254
 255         ///
 256         DocIterator inlineCompletionPos_;
 257         ///
 258         docstring inlineCompletion_;
 259         ///
 260         size_t inlineCompletionUniqueChars_;
 261
 262         /// keyboard mapping object.
 263         Intl intl_;
 264
 265         /// last visited inset.
 266         /** kept to send setMouseHover(false).
 267           * Not owned, so don't delete.
 268           */
 269         Inset const * last_inset_;
 270
 271         /// position of the mouse at the time of the last mouse move
 272         /// This is used to update the hovering status of inset in
 273         /// cases where the buffer is scrolled, but the mouse didn't move.
 274         Point mouse_position_cache_;
 275
 276         mutable TextMetricsCache text_metrics_;
 277
 278         /// Whom to notify.
 279         /** Not owned, so don't delete.
 280           */
 281         frontend::GuiBufferViewDelegate * gui_;
 282
 283         ///
 284         map<string, Inset *> edited_insets_;
 285
 286         /// When the row where the cursor lies is scrolled, this
 287         /// contains the scroll offset
 288         // cache for id of the paragraph which was edited the last time
 289         int bookmark_edit_position_;
 290
 291         int horiz_scroll_offset_;
 292         /// a slice pointing to the start of the row where the cursor
 293         /// is (at last draw time)
 294         CursorSlice current_row_slice_;
 295         /// are we hovering something that we can click
 296         bool clickable_inset_;
 297         /// shape of the caret
 298         frontend::CaretGeometry caret_geometry_;
 299         ///
 300         bool mouse_selecting_ = false;
 301 };
 302
 303
 304 BufferView::BufferView(Buffer & buf)
 305         : width_(0), height_(0), full_screen_(false), buffer_(buf),
 306       d(new Private(*this))
 307 {
 308         d->xsel_cache_.set = false;
 309         d->intl_.initKeyMapper(lyxrc.use_kbmap);
 310
 311         d->cursor_.setBuffer(&buf);
 312         d->cursor_.push(buffer_.inset());
 313         d->cursor_.resetAnchor();
 314         d->cursor_.setCurrentFont();
 315
 316         buffer_.updatePreviews();
 317 }
 318
 319
 320 BufferView::~BufferView()
 321 {
 322         // current buffer is going to be switched-off, save cursor pos
 323         // Ideally, the whole cursor stack should be saved, but session
 324         // currently can only handle bottom (whole document) level pit and pos.
 325         // That is to say, if a cursor is in a nested inset, it will be
 326         // restore to the left of the top level inset.
 327         LastFilePosSection::FilePos fp;
 328         fp.file = buffer_.fileName();
 329         fp.pit = d->cursor_.bottom().pit();
 330         fp.pos = d->cursor_.bottom().pos();
 331         theSession().lastFilePos().save(fp);
 332
 333         if (d->last_inset_)
 334                 d->last_inset_->setMouseHover(this, false);
 335
 336         delete d;
 337 }
 338
 339
 340 int BufferView::defaultMargin() const
 341 {
 342         // The value used to be hardcoded to 10
 343         return zoomedPixels(20);
 344 }
 345
 346
 347 int BufferView::rightMargin() const
 348 {
 349         const int screen_width = inPixels(lyxrc.screen_width);
 350
 351         // The additional test for the case the outliner is opened.
 352         if (!lyxrc.screen_limit || width_ < screen_width + 2 * defaultMargin()) {
 353                 return defaultMargin();
 354         } else {
 355                 return (width_ - screen_width) / 2;
 356         }
 357 }
 358
 359
 360 int BufferView::leftMargin() const
 361 {
 362         return rightMargin();
 363 }
 364
 365
 366 int BufferView::topMargin() const
 367 {
 368         // Original value was 20px at 100dpi. For internal buffers like in
 369         // advanced search and replace, a value of 5px is enough.
 370         return zoomedPixels(buffer().isInternal() ? 5 : 20);
 371 }
 372
 373
 374 int BufferView::bottomMargin() const
 375 {
 376         return topMargin();
 377 }
 378
 379
 380 int BufferView::inPixels(Length const & len) const
 381 {
 382         Font const font = buffer().params().getFont();
 383         return len.inPixels(workWidth(), theFontMetrics(font).em());
 384 }
 385
 386
 387 int BufferView::zoomedPixels(int pix) const
 388 {
 389         // FIXME: the dpi setting should really depend on the BufferView
 390         // (think different monitors).
 391
 392         // Zoom factor specified by user in percent
 393         double const zoom = lyxrc.currentZoom / 100.0; // [percent]
 394
 395         // DPI setting for monitor relative to 100dpi
 396         double const dpizoom = lyxrc.dpi / 100.0; // [per 100dpi]
 397
 398         return support::iround(pix * zoom * dpizoom);
 399 }
 400
 401
 402 bool BufferView::isTopScreen() const
 403 {
 404         return 0 == d->scrollbarParameters_.min;
 405 }
 406
 407
 408 bool BufferView::isBottomScreen() const
 409 {
 410         return 0 == d->scrollbarParameters_.max;
 411 }
 412
 413
 414 Intl & BufferView::getIntl()
 415 {
 416         return d->intl_;
 417 }
 418
 419
 420 Intl const & BufferView::getIntl() const
 421 {
 422         return d->intl_;
 423 }
 424
 425
 426 CoordCache & BufferView::coordCache()
 427 {
 428         return d->coord_cache_;
 429 }
 430
 431
 432 CoordCache const & BufferView::coordCache() const
 433 {
 434         return d->coord_cache_;
 435 }
 436
 437
 438 MathRow const & BufferView::mathRow(MathData const * cell) const
 439 {
 440         auto it = d->math_rows_.find(cell);
 441         LATTEST(it != d->math_rows_.end());
 442         return it->second;
 443 }
 444
 445
 446 void BufferView::setMathRow(MathData const * cell, MathRow const & mrow)
 447 {
 448         d->math_rows_[cell] = mrow;
 449 }
 450
 451
 452 Buffer & BufferView::buffer()
 453 {
 454         return buffer_;
 455 }
 456
 457
 458 Buffer const & BufferView::buffer() const
 459 {
 460         return buffer_;
 461 }
 462
 463
 464 docstring const & BufferView::searchRequestCache() const
 465 {
 466         return theClipboard().getFindBuffer();
 467 }
 468
 469
 470 void BufferView::setSearchRequestCache(docstring const & text)
 471 {
 472         bool casesensitive;
 473         bool matchword;
 474         bool forward;
 475         bool wrap;
 476         bool instant;
 477         bool onlysel;
 478         docstring const search = string2find(text, casesensitive, matchword,
 479                                              forward, wrap, instant, onlysel);
 480         theClipboard().setFindBuffer(search);
 481 }
 482
 483
 484 bool BufferView::needsFitCursor() const
 485 {
 486         if (cursorStatus(d->cursor_) == CUR_INSIDE) {
 487                 frontend::FontMetrics const & fm =
 488                         theFontMetrics(d->cursor_.getFont().fontInfo());
 489                 int const asc = fm.maxAscent();
 490                 int const des = fm.maxDescent();
 491                 Point const p = getPos(d->cursor_);
 492                 if (p.y_ - asc >= 0 && p.y_ + des < height_)
 493                         return false;
 494         }
 495         return true;
 496 }
 497
 498
 499 namespace {
 500
 501 // this is for debugging only.
 502 string flagsAsString(Update::flags flags)
 503 {
 504         if (flags == Update::None)
 505                 return "None ";
 506         return string((flags & Update::FitCursor) ? "FitCursor " : "")
 507                 + ((flags & Update::Force) ? "Force " : "")
 508                 + ((flags & Update::ForceDraw) ? "ForceDraw " : "")
 509                 + ((flags & Update::SinglePar) ? "SinglePar " : "")
 510                 + ((flags & Update::Decoration) ? "Decoration " : "");
 511 }
 512
 513 }
 514
 515 void BufferView::processUpdateFlags(Update::flags flags)
 516 {
 517         LYXERR(Debug::PAINTING, "BufferView::processUpdateFlags( "
 518                    << flagsAsString(flags) << ")  buffer: " << &buffer_);
 519
 520         // Case when no explicit update is requested.
 521         if (flags == Update::None)
 522                 return;
 523
 524         /* FIXME We would like to avoid doing this here, since it is very
 525          * expensive and is called in updateBuffer already. However, even
 526          * inserting a plain character can invalidate the overly fragile
 527          * tables of child documents built by updateMacros. Some work is
 528          * needed to avoid doing that when not necessary.
 529          */
 530         buffer_.updateMacros();
 531
 532         // First check whether the metrics and inset positions should be updated
 533         if (flags & Update::Force) {
 534                 // This will update the CoordCache items and replace Force
 535                 // with ForceDraw in flags.
 536                 updateMetrics(flags);
 537         }
 538
 539         // Detect whether we can only repaint a single paragraph (if we
 540         // are not already redrawing all).
 541         // We handle this before FitCursor because the later will require
 542         // correct metrics at cursor position.
 543         if (!(flags & Update::ForceDraw)
 544                         && (flags & Update::SinglePar)
 545                         && !singleParUpdate())
 546                 updateMetrics(flags);
 547
 548         // Then make sure that the screen contains the cursor if needed
 549         if (flags & Update::FitCursor) {
 550                 if (needsFitCursor()) {
 551                         // First try to make the selection start visible
 552                         // (which is just the cursor when there is no selection)
 553                         scrollToCursor(d->cursor_.selectionBegin(), false, false);
 554                         // Metrics have to be recomputed (maybe again)
 555                         updateMetrics();
 556                         // Is the cursor visible? (only useful if cursor is at end of selection)
 557                         if (needsFitCursor()) {
 558                                 // then try to make cursor visible instead
 559                                 scrollToCursor(d->cursor_, false, false);
 560                                 // Metrics have to be recomputed (maybe again)
 561                                 updateMetrics(flags);
 562                         }
 563                 }
 564                 flags = flags & ~Update::FitCursor;
 565         }
 566
 567         // Add flags to the the update flags. These will be reset to None
 568         // after the redraw is actually done
 569         d->update_flags_ = d->update_flags_ | flags;
 570         LYXERR(Debug::PAINTING, "Cumulative flags: " << flagsAsString(flags));
 571
 572         // Now compute the update strategy
 573         // Possibly values in flag are None, SinglePar, Decoration, ForceDraw
 574         LATTEST((d->update_flags_ & ~(Update::None | Update::SinglePar
 575                                       | Update::Decoration | Update::ForceDraw)) == 0);
 576
 577         if (d->update_flags_ & Update::ForceDraw)
 578                 d->update_strategy_ = FullScreenUpdate;
 579         else if (d->update_flags_ & Update::Decoration)
 580                 d->update_strategy_ = DecorationUpdate;
 581         else if (d->update_flags_ & Update::SinglePar)
 582                 d->update_strategy_ = SingleParUpdate;
 583         else {
 584                 // no need to redraw anything.
 585                 d->update_strategy_ = NoScreenUpdate;
 586         }
 587
 588         updateHoveredInset();
 589
 590         // Trigger a redraw.
 591         buffer_.changed(false);
 592 }
 593
 594
 595 void BufferView::updateScrollbarParameters()
 596 {
 597         if (height_ == 0 && width_ == 0)
 598                 return;
 599
 600         // We prefer fixed size line scrolling.
 601         d->scrollbarParameters_.single_step = defaultRowHeight();
 602         // We prefer full screen page scrolling.
 603         d->scrollbarParameters_.page_step = height_;
 604
 605         Text & t = buffer_.text();
 606         TextMetrics & tm = d->text_metrics_[&t];
 607
 608         LYXERR(Debug::GUI, " Updating scrollbar: height: "
 609                 << t.paragraphs().size()
 610                 << " curr par: " << d->cursor_.bottom().pit()
 611                 << " default height " << defaultRowHeight());
 612
 613         size_t const parsize = t.paragraphs().size();
 614         if (d->par_height_.size() != parsize) {
 615                 d->par_height_.clear();
 616                 // FIXME: We assume a default paragraph height of 2 rows. This
 617                 // should probably be pondered with the screen width.
 618                 d->par_height_.resize(parsize, defaultRowHeight() * 2);
 619         }
 620
 621         // Look at paragraph heights on-screen
 622         pair<pit_type, ParagraphMetrics const *> first = tm.first();
 623         pair<pit_type, ParagraphMetrics const *> last = tm.last();
 624         for (pit_type pit = first.first; pit <= last.first; ++pit) {
 625                 d->par_height_[pit] = tm.parMetrics(pit).height();
 626                 LYXERR(Debug::SCROLLING, "storing height for pit " << pit << " : "
 627                         << d->par_height_[pit]);
 628         }
 629
 630         int top_pos = first.second->position() - first.second->ascent();
 631         int bottom_pos = last.second->position() + last.second->descent();
 632         bool first_visible = first.first == 0 && top_pos >= 0;
 633         bool last_visible = last.first + 1 == int(parsize) && bottom_pos <= height_;
 634         if (first_visible && last_visible) {
 635                 d->scrollbarParameters_.min = 0;
 636                 d->scrollbarParameters_.max = 0;
 637                 return;
 638         }
 639
 640         d->scrollbarParameters_.min = top_pos;
 641         for (size_t i = 0; i != size_t(first.first); ++i)
 642                 d->scrollbarParameters_.min -= d->par_height_[i];
 643         d->scrollbarParameters_.max = bottom_pos;
 644         for (size_t i = last.first + 1; i != parsize; ++i)
 645                 d->scrollbarParameters_.max += d->par_height_[i];
 646
 647         // The reference is the top position so we remove one page.
 648         if (lyxrc.scroll_below_document)
 649                 d->scrollbarParameters_.max -= minVisiblePart();
 650         else
 651                 d->scrollbarParameters_.max -= d->scrollbarParameters_.page_step;
 652
 653         // 0 must be inside the range as it denotes the current position
 654         if (d->scrollbarParameters_.max < 0)
 655                 d->scrollbarParameters_.max = 0;
 656         if (d->scrollbarParameters_.min > 0)
 657                 d->scrollbarParameters_.min = 0;
 658 }
 659
 660
 661 ScrollbarParameters const & BufferView::scrollbarParameters() const
 662 {
 663         return d->scrollbarParameters_;
 664 }
 665
 666
 667 docstring BufferView::toolTip(int x, int y) const
 668 {
 669         // Get inset under mouse, if there is one.
 670         Inset const * covering_inset = getCoveringInset(buffer_.text(), x, y);
 671         if (!covering_inset)
 672                 // No inset, no tooltip...
 673                 return docstring();
 674         return covering_inset->toolTip(*this, x, y);
 675 }
 676
 677
 678 string BufferView::contextMenu(int x, int y) const
 679 {
 680         //If there is a selection, return the containing inset menu
 681         if (d->cursor_.selection())
 682                 return d->cursor_.inset().contextMenu(*this, x, y);
 683
 684         // Get inset under mouse, if there is one.
 685         Inset const * covering_inset = getCoveringInset(buffer_.text(), x, y);
 686         if (covering_inset) {
 687                 if (covering_inset->asInsetMath()) {
 688                         CoordCache::Insets const & inset_cache =
 689                                 coordCache().getInsets();
 690                         Inset const * inner_inset = mathContextMenu(
 691                                 covering_inset->asInsetMath()->asNestInset(),
 692                                 inset_cache, x, y);
 693                         if (inner_inset)
 694                                 return inner_inset->contextMenu(*this, x, y);
 695                 }
 696                 return covering_inset->contextMenu(*this, x, y);
 697         }
 698
 699         return buffer_.inset().contextMenu(*this, x, y);
 700 }
 701
 702
 703 Inset const * BufferView::mathContextMenu(InsetMathNest const * inset,
 704                 CoordCache::Insets const & inset_cache, int x, int y) const
 705 {
 706         for (size_t i = 0; i < inset->nargs(); ++i) {
 707                 MathData const & ar = inset->cell(i);
 708                 for (size_t j = 0; j < ar.size(); ++j) {
 709                         string const name = lyxerr.debugging(Debug::MATHED)
 710                                 ? insetName(ar[j].nucleus()->lyxCode())
 711                                 : string();
 712                         LYXERR(Debug::MATHED, "Examining inset: " << name);
 713                         if (!ar[j].nucleus()->contextMenuName().empty()) {
 714                                 if (inset_cache.covers(ar[j].nucleus(), x, y)) {
 715                                         LYXERR(Debug::MATHED, "Hit inset: "
 716                                                << name);
 717                                         return ar[j].nucleus();
 718                                 }
 719                         }
 720                         InsetMathNest const * imn =
 721                                 ar[j].nucleus()->asNestInset();
 722                         if (imn) {
 723                                 Inset const * inner =
 724                                         mathContextMenu(imn, inset_cache, x, y);
 725                                 if (inner)
 726                                         return inner;
 727                         }
 728                 }
 729         }
 730         return nullptr;
 731 }
 732
 733
 734 void BufferView::scrollDocView(int const pixels, bool update)
 735 {
 736         // The scrollbar values are relative to the top of the screen, therefore the
 737         // offset is equal to the target value.
 738
 739         // No scrolling at all? No need to redraw anything
 740         if (pixels == 0)
 741                 return;
 742
 743         // If the offset is less than 2 screen height, prefer to scroll instead.
 744         if (abs(pixels) <= 2 * height_) {
 745                 d->anchor_ypos_ -= pixels;
 746                 processUpdateFlags(Update::Force);
 747                 return;
 748         }
 749
 750         // cut off at the top
 751         if (pixels <= d->scrollbarParameters_.min) {
 752                 DocIterator dit = doc_iterator_begin(&buffer_);
 753                 showCursor(dit, false, false, update);
 754                 LYXERR(Debug::SCROLLING, "scroll to top");
 755                 return;
 756         }
 757
 758         // cut off at the bottom
 759         if (pixels >= d->scrollbarParameters_.max) {
 760                 DocIterator dit = doc_iterator_end(&buffer_);
 761                 dit.backwardPos();
 762                 showCursor(dit, false, false, update);
 763                 LYXERR(Debug::SCROLLING, "scroll to bottom");
 764                 return;
 765         }
 766
 767         // find paragraph at target position
 768         int par_pos = d->scrollbarParameters_.min;
 769         pit_type i = 0;
 770         for (; i != int(d->par_height_.size()); ++i) {
 771                 par_pos += d->par_height_[i];
 772                 if (par_pos >= pixels)
 773                         break;
 774         }
 775
 776         if (par_pos < pixels) {
 777                 // It seems we didn't find the correct pit so stay on the safe side and
 778                 // scroll to bottom.
 779                 LYXERR0("scrolling position not found!");
 780                 scrollDocView(d->scrollbarParameters_.max, update);
 781                 return;
 782         }
 783
 784         DocIterator dit = doc_iterator_begin(&buffer_);
 785         dit.pit() = i;
 786         LYXERR(Debug::SCROLLING, "pixels = " << pixels << " -> scroll to pit " << i);
 787         showCursor(dit, false, false, update);
 788 }
 789
 790
 791 // FIXME: this method is not working well.
 792 void BufferView::setCursorFromScrollbar()
 793 {
 794         TextMetrics & tm = d->text_metrics_[&buffer_.text()];
 795
 796         int const height = 2 * defaultRowHeight();
 797         int const first = height;
 798         int const last = height_ - height;
 799         int newy = 0;
 800         Cursor const & oldcur = d->cursor_;
 801
 802         switch (cursorStatus(oldcur)) {
 803         case CUR_ABOVE:
 804                 newy = first;
 805                 break;
 806         case CUR_BELOW:
 807                 newy = last;
 808                 break;
 809         case CUR_INSIDE:
 810                 int const y = getPos(oldcur).y_;
 811                 newy = min(last, max(y, first));
 812                 if (y == newy)
 813                         return;
 814         }
 815         // We reset the cursor because cursorStatus() does not
 816         // work when the cursor is within mathed.
 817         Cursor cur(*this);
 818         cur.reset();
 819         tm.setCursorFromCoordinates(cur, 0, newy);
 820
 821         // update the bufferview cursor and notify insets
 822         // FIXME: Care about the d->cursor_ flags to redraw if needed
 823         Cursor old = d->cursor_;
 824         mouseSetCursor(cur);
 825         // the DEPM call in mouseSetCursor() might have destroyed the
 826         // paragraph the cursor is in.
 827         bool badcursor = old.fixIfBroken();
 828         badcursor |= notifyCursorLeavesOrEnters(old, d->cursor_);
 829         if (badcursor)
 830                 d->cursor_.fixIfBroken();
 831 }
 832
 833
 834 Change const BufferView::getCurrentChange() const
 835 {
 836         if (!d->cursor_.selection())
 837                 return Change(Change::UNCHANGED);
 838
 839         DocIterator dit = d->cursor_.selectionBegin();
 840         // The selected content might have been changed (see #7685)
 841         dit = dit.getInnerText();
 842         return dit.paragraph().lookupChange(dit.pos());
 843 }
 844
 845
 846 // this could be used elsewhere as well?
 847 // FIXME: This does not work within mathed!
 848 CursorStatus BufferView::cursorStatus(DocIterator const & dit) const
 849 {
 850         Point const p = getPos(dit);
 851         if (p.y_ < 0)
 852                 return CUR_ABOVE;
 853         if (p.y_ > workHeight())
 854                 return CUR_BELOW;
 855         return CUR_INSIDE;
 856 }
 857
 858
 859 void BufferView::bookmarkEditPosition()
 860 {
 861         // Don't eat cpu time for each keystroke
 862         if (d->cursor_.paragraph().id() == d->bookmark_edit_position_)
 863                 return;
 864         saveBookmark(0);
 865         d->bookmark_edit_position_ = d->cursor_.paragraph().id();
 866 }
 867
 868
 869 void BufferView::saveBookmark(unsigned int idx)
 870 {
 871         if (buffer().isInternal())
 872                 return;
 873
 874         // tentatively save bookmark, id and pos will be used to
 875         // acturately locate a bookmark in a 'live' lyx session.
 876         // pit and pos will be updated with bottom level pit/pos
 877         // when lyx exits.
 878         theSession().bookmarks().save(
 879                 buffer_.fileName(),
 880                 d->cursor_.bottom().pit(),
 881                 d->cursor_.bottom().pos(),
 882                 d->cursor_.paragraph().id(),
 883                 d->cursor_.pos(),
 884                 idx
 885         );
 886         if (idx)
 887                 // emit message signal.
 888                 message(_("Save bookmark"));
 889 }
 890
 891
 892 bool BufferView::moveToPosition(pit_type bottom_pit, pos_type bottom_pos,
 893         int top_id, pos_type top_pos)
 894 {
 895         bool success = false;
 896         DocIterator dit;
 897
 898         d->cursor_.clearSelection();
 899
 900         // if a valid par_id is given, try it first
 901         // This is the case for a 'live' bookmark when unique paragraph ID
 902         // is used to track bookmarks.
 903         if (top_id > 0) {
 904                 dit = buffer_.getParFromID(top_id);
 905                 if (!dit.atEnd()) {
 906                         dit.pos() = min(dit.paragraph().size(), top_pos);
 907                         // Some slices of the iterator may not be
 908                         // reachable (e.g. closed collapsible inset)
 909                         // so the dociterator may need to be
 910                         // shortened. Otherwise, setCursor may crash
 911                         // lyx when the cursor can not be set to these
 912                         // insets.
 913                         size_t const n = dit.depth();
 914                         for (size_t i = 0; i < n; ++i)
 915                                 if (!dit[i].inset().editable()) {
 916                                         dit.resize(i);
 917                                         break;
 918                                 }
 919                         success = true;
 920                 }
 921         }
 922
 923         // if top_id == 0, or searching through top_id failed
 924         // This is the case for a 'restored' bookmark when only bottom
 925         // (document level) pit was saved. Because of this, bookmark
 926         // restoration is inaccurate. If a bookmark was within an inset,
 927         // it will be restored to the left of the outmost inset that contains
 928         // the bookmark.
 929         if (!success && bottom_pit < int(buffer_.paragraphs().size())) {
 930                 dit = doc_iterator_begin(&buffer_);
 931
 932                 dit.pit() = bottom_pit;
 933                 dit.pos() = min(bottom_pos, dit.paragraph().size());
 934                 success = true;
 935         }
 936
 937         if (success) {
 938                 // Note: only bottom (document) level pit is set.
 939                 setCursor(dit);
 940                 // set the current font.
 941                 d->cursor_.setCurrentFont();
 942                 // Do not forget to reset the anchor (see #9912)
 943                 d->cursor_.resetAnchor();
 944                 processUpdateFlags(Update::Force | Update::FitCursor);
 945         }
 946
 947         return success;
 948 }
 949
 950
 951 void BufferView::translateAndInsert(char_type c, Text * t, Cursor & cur)
 952 {
 953         if (d->cursor_.real_current_font.isRightToLeft()) {
 954                 if (d->intl_.keymap == Intl::PRIMARY)
 955                         d->intl_.keyMapSec();
 956         } else {
 957                 if (d->intl_.keymap == Intl::SECONDARY)
 958                         d->intl_.keyMapPrim();
 959         }
 960
 961         d->intl_.getTransManager().translateAndInsert(c, t, cur);
 962 }
 963
 964
 965 int BufferView::workWidth() const
 966 {
 967         return width_;
 968 }
 969
 970
 971 void BufferView::recenter()
 972 {
 973         showCursor(d->cursor_, true, false, true);
 974 }
 975
 976
 977 void BufferView::showCursor()
 978 {
 979         showCursor(d->cursor_, false, false, true);
 980 }
 981
 982
 983 void BufferView::showCursor(DocIterator const & dit,
 984         bool recenter, bool force, bool update)
 985 {
 986         if (scrollToCursor(dit, recenter, force) && update)
 987                 processUpdateFlags(Update::Force);
 988 }
 989
 990
 991 bool BufferView::scrollToCursor(DocIterator const & dit, bool const recenter, bool force)
 992 {
 993         // We are not properly started yet, delay until resizing is done.
 994         if (height_ == 0)
 995                 return false;
 996
 997         if (recenter)
 998                 LYXERR(Debug::SCROLLING, "recentering and scrolling to cursor");
 999         else
1000                 LYXERR(Debug::SCROLLING, "scrolling to cursor");
1001
1002         CursorSlice const & bot = dit.bottom();
1003         TextMetrics & tm = textMetrics(bot.text());
1004
1005         pos_type const max_pit = pos_type(bot.text()->paragraphs().size() - 1);
1006         pos_type bot_pit = bot.pit();
1007         if (bot_pit > max_pit) {
1008                 // FIXME: Why does this happen?
1009                 LYXERR0("bottom pit is greater that max pit: "
1010                         << bot_pit << " > " << max_pit);
1011                 bot_pit = max_pit;
1012         }
1013
1014         if (bot_pit == tm.first().first - 1)
1015                 tm.newParMetricsUp();
1016         else if (bot_pit == tm.last().first + 1)
1017                 tm.newParMetricsDown();
1018
1019         if (tm.contains(bot_pit) && !force) {
1020                 ParagraphMetrics const & pm = tm.parMetrics(bot_pit);
1021                 LBUFERR(!pm.rows().empty());
1022                 // FIXME: smooth scrolling doesn't work in mathed.
1023                 CursorSlice const & cs = dit.innerTextSlice();
1024                 int const ypos = pm.position() + coordOffset(dit).y_;
1025                 ParagraphMetrics const & inner_pm =
1026                         textMetrics(cs.text()).parMetrics(cs.pit());
1027                 Dimension const & row_dim =
1028                         inner_pm.getRow(cs.pos(), dit.boundary()).dim();
1029                 int scrolled = 0;
1030                 if (recenter)
1031                         scrolled = scroll(ypos - height_/2);
1032
1033                 // We try to visualize the whole row, if the row height is larger than
1034                 // the screen height, we scroll to a heuristic value of height_ / 4.
1035                 // FIXME: This heuristic value should be replaced by a recursive search
1036                 // for a row in the inset that can be visualized completely.
1037                 else if (row_dim.height() > height_) {
1038                         if (ypos < defaultRowHeight())
1039                                 scrolled = scroll(ypos - height_ / 4);
1040                         else if (ypos > height_ - defaultRowHeight())
1041                                 scrolled = scroll(ypos - 3 * height_ / 4);
1042                 }
1043
1044                 // If the top part of the row falls of the screen, we scroll
1045                 // up to align the top of the row with the top of the screen.
1046                 else if (ypos - row_dim.ascent() < 0 && ypos < height_) {
1047                         int const ynew = row_dim.ascent();
1048                         scrolled = scrollUp(ynew - ypos);
1049                 }
1050
1051                 // If the bottom of the row falls of the screen, we scroll down.
1052                 else if (ypos + row_dim.descent() > height_ && ypos > 0) {
1053                         int const ynew = height_ - row_dim.descent();
1054                         scrolled = scrollDown(ypos - ynew);
1055                 }
1056
1057                 // else, nothing to do, the cursor is already visible so we just return.
1058                 return scrolled != 0;
1059         }
1060
1061         // fix inline completion position
1062         if (d->inlineCompletionPos_.fixIfBroken())
1063                 d->inlineCompletionPos_ = DocIterator();
1064
1065         tm.redoParagraph(bot_pit);
1066         ParagraphMetrics const & pm = tm.parMetrics(bot_pit);
1067         int const offset = coordOffset(dit).y_;
1068
1069         d->anchor_pit_ = bot_pit;
1070         CursorSlice const & cs = dit.innerTextSlice();
1071         ParagraphMetrics const & inner_pm =
1072                 textMetrics(cs.text()).parMetrics(cs.pit());
1073         Dimension const & row_dim =
1074                 inner_pm.getRow(cs.pos(), dit.boundary()).dim();
1075
1076         if (recenter)
1077                 d->anchor_ypos_ = height_/2;
1078         else if (d->anchor_pit_ == 0)
1079                 d->anchor_ypos_ = offset + pm.ascent();
1080         else if (d->anchor_pit_ == max_pit)
1081                 d->anchor_ypos_ = height_ - offset - row_dim.descent();
1082         else if (offset > height_)
1083                 d->anchor_ypos_ = height_ - offset - row_dim.descent();
1084         else
1085                 d->anchor_ypos_ = row_dim.ascent();
1086
1087         return true;
1088 }
1089
1090
1091 void BufferView::makeDocumentClass()
1092 {
1093         DocumentClassConstPtr olddc = buffer_.params().documentClassPtr();
1094         buffer_.params().makeDocumentClass(buffer_.isClone(), buffer_.isInternal());
1095         updateDocumentClass(olddc);
1096 }
1097
1098
1099 void BufferView::updateDocumentClass(DocumentClassConstPtr olddc)
1100 {
1101         StableDocIterator backcur(d->cursor_);
1102         ErrorList & el = buffer_.errorList("Class Switch");
1103         cap::switchBetweenClasses(
1104                         olddc, buffer_.params().documentClassPtr(),
1105                         static_cast<InsetText &>(buffer_.inset()), el);
1106
1107         setCursor(backcur.asDocIterator(&buffer_));
1108
1109         buffer_.errors("Class Switch");
1110 }
1111
1112
1113 /** Return the change status at cursor position, taking into account the
1114  * status at each level of the document iterator (a table in a deleted
1115  * footnote is deleted).
1116  * When \param outer is true, the top slice is not looked at.
1117  */
1118 static Change::Type lookupChangeType(DocIterator const & dit, bool outer = false)
1119 {
1120         size_t const depth = dit.depth() - (outer ? 1 : 0);
1121
1122         for (size_t i = 0 ; i < depth ; ++i) {
1123                 CursorSlice const & slice = dit[i];
1124                 if (!slice.inset().inMathed()
1125                     && slice.pos() < slice.paragraph().size()) {
1126                         Change::Type const ch = slice.paragraph().lookupChange(slice.pos()).type;
1127                         if (ch != Change::UNCHANGED)
1128                                 return ch;
1129                 }
1130         }
1131         return Change::UNCHANGED;
1132 }
1133
1134
1135 bool BufferView::getStatus(FuncRequest const & cmd, FuncStatus & flag)
1136 {
1137         FuncCode const act = cmd.action();
1138
1139         // Can we use a readonly buffer?
1140         if (buffer_.isReadonly()
1141             && !lyxaction.funcHasFlag(act, LyXAction::ReadOnly)
1142             && !lyxaction.funcHasFlag(act, LyXAction::NoBuffer)) {
1143                 if (buffer_.hasReadonlyFlag())
1144                         flag.message(from_utf8(N_("Document is read-only")));
1145                 else
1146                         flag.message(from_utf8(N_("Document has been modified externally")));
1147                 flag.setEnabled(false);
1148                 return true;
1149         }
1150
1151         // Are we in a DELETED change-tracking region?
1152         if (lookupChangeType(d->cursor_, true) == Change::DELETED
1153             && !lyxaction.funcHasFlag(act, LyXAction::ReadOnly)
1154             && !lyxaction.funcHasFlag(act, LyXAction::NoBuffer)) {
1155                 flag.message(from_utf8(N_("This portion of the document is deleted.")));
1156                 flag.setEnabled(false);
1157                 return true;
1158         }
1159
1160         Cursor & cur = d->cursor_;
1161
1162         if (cur.getStatus(cmd, flag))
1163                 return true;
1164
1165         switch (act) {
1166
1167         // FIXME: This is a bit problematic because we don't check if this is
1168         // a document BufferView or not for these LFUNs. We probably have to
1169         // dispatch both to currentBufferView() and, if that fails,
1170         // to documentBufferView(); same as we do now for current Buffer and
1171         // document Buffer. Ideally those LFUN should go to Buffer as they
1172         // operate on the full Buffer and the cursor is only needed either for
1173         // an Undo record or to restore a cursor position. But we don't know
1174         // how to do that inside Buffer of course.
1175         case LFUN_BUFFER_PARAMS_APPLY:
1176         case LFUN_LAYOUT_MODULES_CLEAR:
1177         case LFUN_LAYOUT_MODULE_ADD:
1178         case LFUN_LAYOUT_RELOAD:
1179         case LFUN_TEXTCLASS_APPLY:
1180         case LFUN_TEXTCLASS_LOAD:
1181                 flag.setEnabled(!buffer_.isReadonly());
1182                 break;
1183
1184         case LFUN_UNDO:
1185                 // We do not use the LyXAction flag for readonly because Undo sets the
1186                 // buffer clean/dirty status by itself.
1187                 flag.setEnabled(!buffer_.isReadonly() && buffer_.undo().hasUndoStack());
1188                 break;
1189         case LFUN_REDO:
1190                 // We do not use the LyXAction flag for readonly because Redo sets the
1191                 // buffer clean/dirty status by itself.
1192                 flag.setEnabled(!buffer_.isReadonly() && buffer_.undo().hasRedoStack());
1193                 break;
1194         case LFUN_FILE_INSERT_PLAINTEXT_PARA:
1195         case LFUN_FILE_INSERT_PLAINTEXT: {
1196                 docstring const & fname = cmd.argument();
1197                 if (!FileName::isAbsolute(to_utf8(fname))) {
1198                         flag.message(_("Absolute filename expected."));
1199                         return false;
1200                 }
1201                 flag.setEnabled(cur.inTexted());
1202                 break;
1203         }
1204         case LFUN_FILE_INSERT:
1205         case LFUN_BOOKMARK_SAVE:
1206                 // FIXME: Actually, these LFUNS should be moved to Text
1207                 flag.setEnabled(cur.inTexted());
1208                 break;
1209
1210         case LFUN_FONT_STATE:
1211         case LFUN_LABEL_INSERT:
1212         case LFUN_INFO_INSERT:
1213         case LFUN_PARAGRAPH_GOTO:
1214         case LFUN_NOTE_NEXT:
1215         case LFUN_REFERENCE_NEXT:
1216         case LFUN_WORD_FIND:
1217         case LFUN_WORD_FIND_FORWARD:
1218         case LFUN_WORD_FIND_BACKWARD:
1219         case LFUN_WORD_REPLACE:
1220         case LFUN_MARK_OFF:
1221         case LFUN_MARK_ON:
1222         case LFUN_MARK_TOGGLE:
1223         case LFUN_SEARCH_STRING_SET:
1224         case LFUN_SCREEN_RECENTER:
1225         case LFUN_SCREEN_SHOW_CURSOR:
1226         case LFUN_BIBTEX_DATABASE_ADD:
1227         case LFUN_BIBTEX_DATABASE_DEL:
1228         case LFUN_BIBTEX_DATABASE_LIST:
1229         case LFUN_STATISTICS:
1230         case LFUN_KEYMAP_OFF:
1231         case LFUN_KEYMAP_PRIMARY:
1232         case LFUN_KEYMAP_SECONDARY:
1233         case LFUN_KEYMAP_TOGGLE:
1234         case LFUN_INSET_SELECT_ALL:
1235                 flag.setEnabled(true);
1236                 break;
1237
1238         case LFUN_GRAPHICS_UNIFY:
1239                 flag.setEnabled(cur.countInsetsInSelection(GRAPHICS_CODE)>1);
1240                 break;
1241
1242         case LFUN_WORD_FINDADV: {
1243                 FindAndReplaceOptions opt;
1244                 istringstream iss(to_utf8(cmd.argument()));
1245                 iss >> opt;
1246                 flag.setEnabled(opt.repl_buf_name.empty()
1247                                 || !buffer_.isReadonly());
1248                 break;
1249         }
1250
1251         case LFUN_LABEL_GOTO:
1252                 flag.setEnabled(!cmd.argument().empty()
1253                     || getInsetByCode<InsetRef>(cur, REF_CODE)
1254                     || getInsetByCode<InsetMathRef>(cur, MATH_REF_CODE));
1255                 break;
1256
1257         case LFUN_CHANGES_MERGE:
1258         case LFUN_CHANGE_NEXT:
1259         case LFUN_CHANGE_PREVIOUS:
1260         case LFUN_ALL_CHANGES_ACCEPT:
1261         case LFUN_ALL_CHANGES_REJECT:
1262                 flag.setEnabled(buffer_.areChangesPresent());
1263                 break;
1264
1265         case LFUN_SCREEN_UP:
1266         case LFUN_SCREEN_DOWN:
1267         case LFUN_SCROLL:
1268         case LFUN_SCREEN_UP_SELECT:
1269         case LFUN_SCREEN_DOWN_SELECT:
1270         case LFUN_INSET_FORALL:
1271                 flag.setEnabled(true);
1272                 break;
1273
1274         case LFUN_LAYOUT_TABULAR:
1275                 flag.setEnabled(cur.innerInsetOfType(TABULAR_CODE));
1276                 break;
1277
1278         case LFUN_LAYOUT:
1279                 flag.setEnabled(!cur.inset().forcePlainLayout(cur.idx()));
1280                 break;
1281
1282         case LFUN_LAYOUT_PARAGRAPH:
1283                 flag.setEnabled(cur.inset().allowParagraphCustomization(cur.idx()));
1284                 break;
1285
1286         case LFUN_BRANCH_ADD_INSERT:
1287                 flag.setEnabled(!(cur.inTexted() && cur.paragraph().isPassThru()));
1288                 break;
1289
1290         case LFUN_DIALOG_SHOW_NEW_INSET:
1291                 // FIXME: this is wrong, but I do not understand the
1292                 // intent (JMarc)
1293                 if (cur.inset().lyxCode() == CAPTION_CODE)
1294                         return cur.inset().getStatus(cur, cmd, flag);
1295                 // FIXME we should consider passthru paragraphs too.
1296                 flag.setEnabled(!(cur.inTexted() && cur.paragraph().isPassThru()));
1297                 break;
1298
1299         case LFUN_CITATION_INSERT: {
1300                 FuncRequest fr(LFUN_INSET_INSERT, "citation");
1301                 // FIXME: This could turn in a recursive hell.
1302                 // Shouldn't we use Buffer::getStatus() instead?
1303                 flag.setEnabled(lyx::getStatus(fr).enabled());
1304                 break;
1305         }
1306         case LFUN_INSET_APPLY: {
1307                 string const name = cmd.getArg(0);
1308                 Inset * inset = editedInset(name);
1309                 if (inset) {
1310                         FuncRequest fr(LFUN_INSET_MODIFY, cmd.argument());
1311                         if (!inset->getStatus(cur, fr, flag)) {
1312                                 // Every inset is supposed to handle this
1313                                 LASSERT(false, break);
1314                         }
1315                 } else {
1316                         FuncRequest fr(LFUN_INSET_INSERT, cmd.argument());
1317                         flag = lyx::getStatus(fr);
1318                 }
1319                 break;
1320         }
1321
1322         case LFUN_COPY:
1323                 flag.setEnabled(cur.selection());
1324                 break;
1325
1326         default:
1327                 return false;
1328         }
1329
1330         return true;
1331 }
1332
1333
1334 Inset * BufferView::editedInset(string const & name) const
1335 {
1336         map<string, Inset *>::const_iterator it = d->edited_insets_.find(name);
1337         return it == d->edited_insets_.end() ? nullptr : it->second;
1338 }
1339
1340
1341 void BufferView::editInset(string const & name, Inset * inset)
1342 {
1343         if (inset)
1344                 d->edited_insets_[name] = inset;
1345         else
1346                 d->edited_insets_.erase(name);
1347 }
1348
1349
1350 void BufferView::dispatch(FuncRequest const & cmd, DispatchResult & dr)
1351 {
1352         LYXERR(Debug::ACTION, "BufferView::dispatch: cmd: " << cmd);
1353
1354         string const argument = to_utf8(cmd.argument());
1355         Cursor & cur = d->cursor_;
1356         Cursor old = cur;
1357
1358         // Don't dispatch function that does not apply to internal buffers.
1359         if (buffer_.isInternal()
1360             && lyxaction.funcHasFlag(cmd.action(), LyXAction::NoInternal))
1361                 return;
1362
1363         // We'll set this back to false if need be.
1364         bool dispatched = true;
1365         buffer_.undo().beginUndoGroup();
1366
1367         FuncCode const act = cmd.action();
1368         switch (act) {
1369
1370         case LFUN_BUFFER_PARAMS_APPLY: {
1371                 DocumentClassConstPtr olddc = buffer_.params().documentClassPtr();
1372                 cur.recordUndoBufferParams();
1373                 istringstream ss(to_utf8(cmd.argument()));
1374                 Lexer lex;
1375                 lex.setStream(ss);
1376                 int const unknown_tokens = buffer_.readHeader(lex);
1377                 if (unknown_tokens != 0) {
1378                         LYXERR0("Warning in LFUN_BUFFER_PARAMS_APPLY!\n"
1379                                                 << unknown_tokens << " unknown token"
1380                                                 << (unknown_tokens == 1 ? "" : "s"));
1381                 }
1382                 updateDocumentClass(olddc);
1383
1384                 // We are most certainly here because of a change in the document
1385                 // It is then better to make sure that all dialogs are in sync with
1386                 // current document settings.
1387                 dr.screenUpdate(Update::Force | Update::FitCursor);
1388                 dr.forceBufferUpdate();
1389                 break;
1390         }
1391
1392         case LFUN_LAYOUT_MODULES_CLEAR: {
1393                 // FIXME: this modifies the document in cap::switchBetweenClasses
1394                 //  without calling recordUndo. Fix this before using
1395                 //  recordUndoBufferParams().
1396                 cur.recordUndoFullBuffer();
1397                 buffer_.params().clearLayoutModules();
1398                 makeDocumentClass();
1399                 dr.screenUpdate(Update::Force);
1400                 dr.forceBufferUpdate();
1401                 break;
1402         }
1403
1404         case LFUN_LAYOUT_MODULE_ADD: {
1405                 BufferParams const & params = buffer_.params();
1406                 if (!params.layoutModuleCanBeAdded(argument)) {
1407                         LYXERR0("Module `" << argument <<
1408                                 "' cannot be added due to failed requirements or "
1409                                 "conflicts with installed modules.");
1410                         break;
1411                 }
1412                 // FIXME: this modifies the document in cap::switchBetweenClasses
1413                 //  without calling recordUndo. Fix this before using
1414                 //  recordUndoBufferParams().
1415                 cur.recordUndoFullBuffer();
1416                 buffer_.params().addLayoutModule(argument);
1417                 makeDocumentClass();
1418                 dr.screenUpdate(Update::Force);
1419                 dr.forceBufferUpdate();
1420                 break;
1421         }
1422
1423         case LFUN_TEXTCLASS_APPLY: {
1424                 // since this shortcircuits, the second call is made only if
1425                 // the first fails
1426                 bool const success =
1427                         LayoutFileList::get().load(argument, buffer_.temppath()) ||
1428                         LayoutFileList::get().load(argument, buffer_.filePath());
1429                 if (!success) {
1430                         docstring s = bformat(_("The document class `%1$s' "
1431                                                  "could not be loaded."), from_utf8(argument));
1432                         frontend::Alert::error(_("Could not load class"), s);
1433                         break;
1434                 }
1435
1436                 LayoutFile const * old_layout = buffer_.params().baseClass();
1437                 LayoutFile const * new_layout = &(LayoutFileList::get()[argument]);
1438
1439                 if (old_layout == new_layout)
1440                         // nothing to do
1441                         break;
1442
1443                 // Save the old, possibly modular, layout for use in conversion.
1444                 // FIXME: this modifies the document in cap::switchBetweenClasses
1445                 //  without calling recordUndo. Fix this before using
1446                 //  recordUndoBufferParams().
1447                 cur.recordUndoFullBuffer();
1448                 buffer_.params().setBaseClass(argument, buffer_.layoutPos());
1449                 makeDocumentClass();
1450                 dr.screenUpdate(Update::Force);
1451                 dr.forceBufferUpdate();
1452                 break;
1453         }
1454
1455         case LFUN_TEXTCLASS_LOAD: {
1456                 // since this shortcircuits, the second call is made only if
1457                 // the first fails
1458                 bool const success =
1459                         LayoutFileList::get().load(argument, buffer_.temppath()) ||
1460                         LayoutFileList::get().load(argument, buffer_.filePath());
1461                 if (!success) {
1462                         docstring s = bformat(_("The document class `%1$s' "
1463                                                  "could not be loaded."), from_utf8(argument));
1464                         frontend::Alert::error(_("Could not load class"), s);
1465                 }
1466                 break;
1467         }
1468
1469         case LFUN_LAYOUT_RELOAD: {
1470                 LayoutFileIndex bc = buffer_.params().baseClassID();
1471                 LayoutFileList::get().reset(bc);
1472                 buffer_.params().setBaseClass(bc, buffer_.layoutPos());
1473                 makeDocumentClass();
1474                 dr.screenUpdate(Update::Force);
1475                 dr.forceBufferUpdate();
1476                 break;
1477         }
1478
1479         case LFUN_UNDO: {
1480                 dr.setMessage(_("Undo"));
1481                 cur.clearSelection();
1482                 // We need to find out if the bibliography information
1483                 // has changed. See bug #11055.
1484                 // So these should not be references...
1485                 string const engine = buffer().params().citeEngine();
1486                 CiteEngineType const enginetype = buffer().params().citeEngineType();
1487                 if (!cur.undoAction())
1488                         dr.setMessage(_("No further undo information"));
1489                 else {
1490                         dr.screenUpdate(Update::Force | Update::FitCursor);
1491                         dr.forceBufferUpdate();
1492                         resetInlineCompletionPos();
1493                         if (buffer().params().citeEngine() != engine ||
1494                             buffer().params().citeEngineType() != enginetype)
1495                                 buffer().invalidateCiteLabels();
1496                 }
1497                 break;
1498         }
1499
1500         case LFUN_REDO: {
1501                 dr.setMessage(_("Redo"));
1502                 cur.clearSelection();
1503                 // We need to find out if the bibliography information
1504                 // has changed. See bug #11055.
1505                 // So these should not be references...
1506                 string const engine = buffer().params().citeEngine();
1507                 CiteEngineType const enginetype = buffer().params().citeEngineType();
1508                 if (!cur.redoAction())
1509                         dr.setMessage(_("No further redo information"));
1510                 else {
1511                         dr.screenUpdate(Update::Force | Update::FitCursor);
1512                         dr.forceBufferUpdate();
1513                         resetInlineCompletionPos();
1514                         if (buffer().params().citeEngine() != engine ||
1515                             buffer().params().citeEngineType() != enginetype)
1516                                 buffer().invalidateCiteLabels();
1517                 }
1518                 break;
1519         }
1520
1521         case LFUN_FONT_STATE:
1522                 dr.setMessage(cur.currentState(false));
1523                 break;
1524
1525         case LFUN_BOOKMARK_SAVE:
1526                 dr.screenUpdate(Update::Force);
1527                 saveBookmark(convert<unsigned int>(to_utf8(cmd.argument())));
1528                 break;
1529
1530         case LFUN_LABEL_GOTO: {
1531                 docstring label = cmd.argument();
1532                 if (label.empty()) {
1533                         InsetRef * inset =
1534                                 getInsetByCode<InsetRef>(cur, REF_CODE);
1535                         if (inset) {
1536                                 label = inset->getParam("reference");
1537                                 // persistent=false: use temp_bookmark
1538                                 saveBookmark(0);
1539                         }
1540                 }
1541                 if (!label.empty()) {
1542                         gotoLabel(label);
1543                         // at the moment, this is redundant, since gotoLabel will
1544                         // eventually call LFUN_PARAGRAPH_GOTO, but it seems best
1545                         // to have it here.
1546                         dr.screenUpdate(Update::Force | Update::FitCursor);
1547                 } else {
1548                         InsetMathRef * minset =
1549                                 getInsetByCode<InsetMathRef>(cur, MATH_REF_CODE);
1550                         if (minset)
1551                                 lyx::dispatch(FuncRequest(LFUN_LABEL_GOTO,
1552                                                         minset->getTarget()));
1553                 }
1554                 break;
1555         }
1556
1557         case LFUN_PARAGRAPH_GOTO: {
1558                 int const id = convert<int>(cmd.getArg(0));
1559                 pos_type const pos = convert<int>(cmd.getArg(1));
1560                 if (id < 0)
1561                         break;
1562                 string const str_id_end = cmd.getArg(2);
1563                 string const str_pos_end = cmd.getArg(3);
1564                 int i = 0;
1565                 for (Buffer * b = &buffer_; i == 0 || b != &buffer_;
1566                         b = theBufferList().next(b)) {
1567
1568                         Cursor curs(*this);
1569                         curs.setCursor(b->getParFromID(id));
1570                         if (curs.atEnd()) {
1571                                 LYXERR(Debug::INFO, "No matching paragraph found! [" << id << "].");
1572                                 ++i;
1573                                 continue;
1574                         }
1575                         LYXERR(Debug::INFO, "Paragraph " << curs.paragraph().id()
1576                                 << " found in buffer `"
1577                                 << b->absFileName() << "'.");
1578
1579                         if (b == &buffer_) {
1580                                 bool success;
1581                                 if (str_id_end.empty() || str_pos_end.empty()) {
1582                                         // Set the cursor
1583                                         curs.pos() = pos;
1584                                         mouseSetCursor(curs);
1585                                         success = true;
1586                                 } else {
1587                                         int const id_end = convert<int>(str_id_end);
1588                                         pos_type const pos_end = convert<int>(str_pos_end);
1589                                         success = setCursorFromEntries({id, pos},
1590                                                                        {id_end, pos_end});
1591                                 }
1592                                 if (success && scrollToCursor(d->cursor_, false, true))
1593                                                 dr.screenUpdate(Update::Force);
1594                         } else {
1595                                 // Switch to other buffer view and resend cmd
1596                                 lyx::dispatch(FuncRequest(
1597                                         LFUN_BUFFER_SWITCH, b->absFileName()));
1598                                 lyx::dispatch(cmd);
1599                         }
1600                         break;
1601                 }
1602                 break;
1603         }
1604
1605         case LFUN_NOTE_NEXT:
1606                 if (gotoInset(this, { NOTE_CODE }, false))
1607                         dr.screenUpdate(Update::Force);
1608                 break;
1609
1610         case LFUN_REFERENCE_NEXT: {
1611                 if (gotoInset(this, { LABEL_CODE, REF_CODE }, true))
1612                         dr.screenUpdate(Update::Force);
1613                 break;
1614         }
1615
1616         case LFUN_CHANGE_NEXT:
1617                 findNextChange(this);
1618                 if (cur.inset().isTable())
1619                         // In tables, there might be whole changed rows or columns
1620                         cur.dispatch(cmd);
1621                 // FIXME: Move this LFUN to Buffer so that we don't have to do this:
1622                 dr.screenUpdate(Update::Force | Update::FitCursor);
1623                 break;
1624
1625         case LFUN_CHANGE_PREVIOUS:
1626                 findPreviousChange(this);
1627                 if (cur.inset().isTable())
1628                         // In tables, there might be whole changed rows or columns
1629                         cur.dispatch(cmd);
1630                 // FIXME: Move this LFUN to Buffer so that we don't have to do this:
1631                 dr.screenUpdate(Update::Force | Update::FitCursor);
1632                 break;
1633
1634         case LFUN_CHANGES_MERGE:
1635                 if (findNextChange(this) || findPreviousChange(this)) {
1636                         dr.screenUpdate(Update::Force | Update::FitCursor);
1637                         dr.forceBufferUpdate();
1638                         showDialog("changes");
1639                 }
1640                 break;
1641
1642         case LFUN_ALL_CHANGES_ACCEPT: {
1643                 // select complete document
1644                 cur.reset();
1645                 cur.selHandle(true);
1646                 buffer_.text().cursorBottom(cur);
1647                 // accept everything in a single step to support atomic undo
1648                 // temporarily disable track changes in order to end with really
1649                 // no new (e.g., DPSM-caused) changes (see #7487)
1650                 bool const track = buffer_.params().track_changes;
1651                 buffer_.params().track_changes = false;
1652                 buffer_.text().acceptOrRejectChanges(cur, Text::ACCEPT);
1653                 buffer_.params().track_changes = track;
1654                 cur.resetAnchor();
1655                 // FIXME: Move this LFUN to Buffer so that we don't have to do this:
1656                 dr.screenUpdate(Update::Force | Update::FitCursor);
1657                 dr.forceBufferUpdate();
1658                 break;
1659         }
1660
1661         case LFUN_ALL_CHANGES_REJECT: {
1662                 // select complete document
1663                 cur.reset();
1664                 cur.selHandle(true);
1665                 buffer_.text().cursorBottom(cur);
1666                 // reject everything in a single step to support atomic undo
1667                 // temporarily disable track changes in order to end with really
1668                 // no new (e.g., DPSM-caused) changes (see #7487)
1669                 bool const track = buffer_.params().track_changes;
1670                 buffer_.params().track_changes = false;
1671                 buffer_.text().acceptOrRejectChanges(cur, Text::REJECT);
1672                 buffer_.params().track_changes = track;
1673                 cur.resetAnchor();
1674                 // FIXME: Move this LFUN to Buffer so that we don't have to do this:
1675                 dr.screenUpdate(Update::Force | Update::FitCursor);
1676                 dr.forceBufferUpdate();
1677                 break;
1678         }
1679
1680         case LFUN_WORD_FIND_FORWARD:
1681         case LFUN_WORD_FIND_BACKWARD: {
1682                 docstring searched_string;
1683
1684                 if (!cmd.argument().empty()) {
1685                         setSearchRequestCache(cmd.argument());
1686                         searched_string = cmd.argument();
1687                 } else {
1688                         searched_string = searchRequestCache();
1689                 }
1690
1691                 if (searched_string.empty())
1692                         break;
1693
1694                 docstring const data =
1695                         find2string(searched_string, false, false,
1696                                     act == LFUN_WORD_FIND_FORWARD, false, false, false);
1697                 bool found = lyxfind(this, FuncRequest(LFUN_WORD_FIND, data));
1698                 if (found)
1699                         dr.screenUpdate(Update::Force | Update::FitCursor);
1700                 else
1701                         dr.setMessage(_("Search string not found!"));
1702                 break;
1703         }
1704
1705         case LFUN_WORD_FIND: {
1706                 docstring arg = cmd.argument();
1707                 if (arg.empty())
1708                         arg = searchRequestCache();
1709                 if (arg.empty()) {
1710                         lyx::dispatch(FuncRequest(LFUN_DIALOG_SHOW, "findreplace"));
1711                         break;
1712                 }
1713                 if (lyxfind(this, FuncRequest(act, arg)))
1714                         dr.screenUpdate(Update::Force | Update::FitCursor);
1715                 else
1716                         dr.setMessage(_("Search string not found!"));
1717
1718                 setSearchRequestCache(arg);
1719                 break;
1720         }
1721
1722         case LFUN_SEARCH_STRING_SET: {
1723                 docstring pattern = cmd.argument();
1724                 if (!pattern.empty()) {
1725                         setSearchRequestCache(pattern);
1726                         break;
1727                 }
1728                 if (cur.selection())
1729                         pattern = cur.selectionAsString(false);
1730                 else if (!cur.inTexted())
1731                         break; // not suitable for selectWord at cursor
1732                 else {
1733                         pos_type spos = cur.pos();
1734                         cur.innerText()->selectWord(cur, WHOLE_WORD);
1735                         pattern = cur.selectionAsString(false);
1736                         cur.selection(false);
1737                         cur.pos() = spos;
1738                 }
1739                 setSearchRequestCache(pattern);
1740                 break;
1741         }
1742
1743         case LFUN_WORD_REPLACE: {
1744                 if (lyxreplace(this, cmd)) {
1745                         dr.forceBufferUpdate();
1746                         dr.screenUpdate(Update::Force | Update::FitCursor);
1747                 }
1748                 else
1749                         dr.setMessage(_("Search string not found!"));
1750                 break;
1751         }
1752
1753         case LFUN_WORD_FINDADV: {
1754                 FindAndReplaceOptions opt;
1755                 istringstream iss(to_utf8(cmd.argument()));
1756                 iss >> opt;
1757                 if (findAdv(this, opt)) {
1758                         dr.screenUpdate(Update::Force | Update::FitCursor);
1759                         cur.dispatched();
1760                         dispatched = true;
1761                 } else {
1762                         cur.undispatched();
1763                         dispatched = false;
1764                 }
1765                 break;
1766         }
1767
1768         case LFUN_INDEX_TAG_ALL: {
1769                 Inset * ins = cur.nextInset();
1770                 if (!ins || ins->lyxCode() != INDEX_CODE)
1771                         // not at index inset
1772                         break;
1773
1774                 // clone the index inset
1775                 InsetIndex * cins =
1776                         new InsetIndex(static_cast<InsetIndex &>(*cur.nextInset()));
1777                 // In order to avoid duplication, we compare the
1778                 // LaTeX output if we find another index inset after
1779                 // the word
1780                 odocstringstream oilatex;
1781                 otexstream oits(oilatex);
1782                 OutputParams rp(&cur.buffer()->params().encoding());
1783                 ins->latex(oits, rp);
1784                 cap::copyInsetToTemp(cur, cins);
1785
1786                 // move backwards into preceding word
1787                 // skip over other index insets
1788                 cur.backwardPosIgnoreCollapsed();
1789                 while (true) {
1790                         if (cur.inset().lyxCode() == INDEX_CODE)
1791                                 cur.pop_back();
1792                         else if (cur.prevInset() && cur.prevInset()->lyxCode() == INDEX_CODE)
1793                                 cur.backwardPosIgnoreCollapsed();
1794                         else
1795                                 break;
1796                 }
1797                 if (!cur.inTexted()) {
1798                         // Nothing to do here.
1799                         setCursorFromInset(ins);
1800                         break;
1801                 }
1802                 // Get word or selection
1803                 cur.text()->selectWord(cur, WHOLE_WORD);
1804                 docstring const searched_string = cur.selectionAsString(false);
1805                 // Start from the beginning
1806                 lyx::dispatch(FuncRequest(LFUN_BUFFER_BEGIN));
1807                 while (findOne(this, searched_string,
1808                                false,// case sensitive
1809                                true,// match whole word only
1810                                true,// forward
1811                                false,//find deleted
1812                                false,//check wrap
1813                                false,// auto-wrap
1814                                false,// instant
1815                                false// only selection
1816                                )) {
1817                         cur.clearSelection();
1818                         Inset * ains = cur.nextInset();
1819                         if (ains && ains->lyxCode() == INDEX_CODE) {
1820                                 // We have an index inset.
1821                                 // Check whether it has the same
1822                                 // LaTeX content and move on if so.
1823                                 odocstringstream filatex;
1824                                 otexstream fits(filatex);
1825                                 ains->latex(fits, rp);
1826                                 if (oilatex.str() == filatex.str())
1827                                         continue;
1828                         }
1829                         // Paste the inset and possibly continue
1830                         cap::pasteFromTemp(cursor(), cursor().buffer()->errorList("Paste"));
1831                 }
1832                 // Go back to start position.
1833                 setCursorFromInset(ins);
1834                 dr.screenUpdate(cur.result().screenUpdate());
1835                 if (cur.result().needBufferUpdate())
1836                         dr.forceBufferUpdate();
1837                 break;
1838         }
1839
1840         case LFUN_MARK_OFF:
1841                 cur.clearSelection();
1842                 dr.setMessage(from_utf8(N_("Mark off")));
1843                 break;
1844
1845         case LFUN_MARK_ON:
1846                 cur.clearSelection();
1847                 cur.setMark(true);
1848                 dr.setMessage(from_utf8(N_("Mark on")));
1849                 break;
1850
1851         case LFUN_MARK_TOGGLE:
1852                 cur.selection(false);
1853                 if (cur.mark()) {
1854                         cur.setMark(false);
1855                         dr.setMessage(from_utf8(N_("Mark removed")));
1856                 } else {
1857                         cur.setMark(true);
1858                         dr.setMessage(from_utf8(N_("Mark set")));
1859                 }
1860                 cur.resetAnchor();
1861                 break;
1862
1863         case LFUN_SCREEN_SHOW_CURSOR:
1864                 showCursor();
1865                 break;
1866
1867         case LFUN_SCREEN_RECENTER:
1868                 recenter();
1869                 break;
1870
1871         case LFUN_BIBTEX_DATABASE_ADD: {
1872                 Cursor tmpcur = cur;
1873                 findInset(tmpcur, { BIBTEX_CODE }, false);
1874                 InsetBibtex * inset = getInsetByCode<InsetBibtex>(tmpcur,
1875                                                 BIBTEX_CODE);
1876                 if (inset) {
1877                         if (inset->addDatabase(cmd.argument()))
1878                                 dr.forceBufferUpdate();
1879                 }
1880                 break;
1881         }
1882
1883         case LFUN_BIBTEX_DATABASE_DEL: {
1884                 Cursor tmpcur = cur;
1885                 findInset(tmpcur, { BIBTEX_CODE }, false);
1886                 InsetBibtex * inset = getInsetByCode<InsetBibtex>(tmpcur,
1887                                                 BIBTEX_CODE);
1888                 if (inset) {
1889                         if (inset->delDatabase(cmd.argument()))
1890                                 dr.forceBufferUpdate();
1891                 }
1892                 break;
1893         }
1894
1895         case LFUN_GRAPHICS_UNIFY: {
1896
1897                 cur.recordUndoFullBuffer();
1898
1899                 DocIterator from, to;
1900                 from = cur.selectionBegin();
1901                 to = cur.selectionEnd();
1902
1903                 string const newId = cmd.getArg(0);
1904                 bool fetchId = newId.empty(); //if we wait for groupId from first graphics inset
1905
1906                 InsetGraphicsParams grp_par;
1907                 if (!fetchId)
1908                         InsetGraphics::string2params(graphics::getGroupParams(buffer_, newId), buffer_, grp_par);
1909
1910                 if (!from.nextInset())  //move to closest inset
1911                         from.forwardInset();
1912
1913                 while (!from.empty() && from < to) {
1914                         Inset * inset = from.nextInset();
1915                         if (!inset)
1916                                 break;
1917                         InsetGraphics * ig = inset->asInsetGraphics();
1918                         if (ig) {
1919                                 InsetGraphicsParams inspar = ig->getParams();
1920                                 if (fetchId) {
1921                                         grp_par = inspar;
1922                                         fetchId = false;
1923                                 } else {
1924                                         grp_par.filename = inspar.filename;
1925                                         ig->setParams(grp_par);
1926                                 }
1927                         }
1928                         from.forwardInset();
1929                 }
1930                 dr.screenUpdate(Update::Force); //needed if triggered from context menu
1931                 break;
1932         }
1933
1934         case LFUN_BIBTEX_DATABASE_LIST: {
1935                 docstring_list const & files = buffer_.getBibfiles();
1936                 bool first = true;
1937                 docstring result;
1938                 char const separator(os::path_separator());
1939                 for (auto const & file : files) {
1940                         if (first)
1941                                 first = false;
1942                         else
1943                                 result += separator;
1944
1945                         FileName const fn = buffer_.getBibfilePath(file);
1946                         string const path = fn.realPath();
1947                         result += from_utf8(os::external_path(path));
1948                 }
1949                 dr.setMessage(result);
1950                 break;
1951         }
1952
1953         case LFUN_STATISTICS: {
1954                 DocIterator from, to;
1955                 if (cur.selection()) {
1956                         from = cur.selectionBegin();
1957                         to = cur.selectionEnd();
1958                 } else {
1959                         from = doc_iterator_begin(&buffer_);
1960                         to = doc_iterator_end(&buffer_);
1961                 }
1962                 buffer_.updateStatistics(from, to);
1963                 int const words = buffer_.wordCount();
1964                 int const chars = buffer_.charCount(false);
1965                 int const chars_blanks = buffer_.charCount(true);
1966                 docstring message;
1967                 if (cur.selection())
1968                         message = _("Statistics for the selection:");
1969                 else
1970                         message = _("Statistics for the document:");
1971                 message += "\n\n";
1972                 if (words != 1)
1973                         message += bformat(_("%1$d words"), words);
1974                 else
1975                         message += _("One word");
1976                 message += "\n";
1977                 if (chars_blanks != 1)
1978                         message += bformat(_("%1$d characters"), chars_blanks);
1979                 else
1980                         message += _("One character");
1981                 message += "\n";
1982                 if (chars != 1)
1983                         message += bformat(_("%1$d characters (no blanks)"), chars);
1984                 else
1985                         message += _("One character (no blanks)");
1986
1987                 Alert::information(_("Statistics"), message);
1988         }
1989                 break;
1990
1991         case LFUN_SCREEN_UP:
1992         case LFUN_SCREEN_DOWN: {
1993                 Point p = getPos(cur);
1994                 // This code has been commented out to enable to scroll down a
1995                 // document, even if there are large insets in it (see bug #5465).
1996                 /*if (p.y_ < 0 || p.y_ > height_) {
1997                         // The cursor is off-screen so recenter before proceeding.
1998                         showCursor();
1999                         p = getPos(cur);
2000                 }*/
2001                 int const scrolled = scroll(act == LFUN_SCREEN_UP
2002                         ? -height_ : height_);
2003                 if (act == LFUN_SCREEN_UP && scrolled > -height_)
2004                         p = Point(0, 0);
2005                 if (act == LFUN_SCREEN_DOWN && scrolled < height_)
2006                         p = Point(width_, height_);
2007                 bool const in_texted = cur.inTexted();
2008                 cur.setCursor(doc_iterator_begin(cur.buffer()));
2009                 cur.selHandle(false);
2010                 // Force an immediate computation of metrics because we need it below
2011                 if (scrolled)
2012                         processUpdateFlags(Update::Force);
2013
2014                 d->text_metrics_[&buffer_.text()].editXY(cur, p.x_, p.y_,
2015                         true, act == LFUN_SCREEN_UP);
2016                 //FIXME: what to do with cur.x_target()?
2017                 bool update = in_texted && cur.bv().checkDepm(cur, old);
2018                 cur.finishUndo();
2019
2020                 if (update || cur.mark())
2021                         dr.screenUpdate(Update::Force | Update::FitCursor);
2022                 if (update)
2023                         dr.forceBufferUpdate();
2024                 break;
2025         }
2026
2027         case LFUN_SCROLL: {
2028                 string const scroll_type = cmd.getArg(0);
2029                 int scroll_step = 0;
2030                 if (scroll_type == "line")
2031                         scroll_step = d->scrollbarParameters_.single_step;
2032                 else if (scroll_type == "page")
2033                         scroll_step = d->scrollbarParameters_.page_step;
2034                 else
2035                         return;
2036                 string const scroll_quantity = cmd.getArg(1);
2037                 if (scroll_quantity == "up")
2038                         scrollUp(scroll_step);
2039                 else if (scroll_quantity == "down")
2040                         scrollDown(scroll_step);
2041                 else {
2042                         int const scroll_value = convert<int>(scroll_quantity);
2043                         if (scroll_value)
2044                                 scroll(scroll_step * scroll_value);
2045                 }
2046                 dr.screenUpdate(Update::ForceDraw);
2047                 dr.forceBufferUpdate();
2048                 break;
2049         }
2050
2051         case LFUN_SCREEN_UP_SELECT: {
2052                 // FIXME: why is the algorithm different from LFUN_SCREEN_UP?
2053                 cur.selHandle(true);
2054                 if (isTopScreen()) {
2055                         lyx::dispatch(FuncRequest(LFUN_BUFFER_BEGIN_SELECT));
2056                         cur.finishUndo();
2057                         break;
2058                 }
2059                 int y = getPos(cur).y_;
2060                 int const ymin = y - height_ + defaultRowHeight();
2061                 while (y > ymin && cur.up())
2062                         y = getPos(cur).y_;
2063
2064                 cur.finishUndo();
2065                 dr.screenUpdate(Update::SinglePar | Update::FitCursor);
2066                 break;
2067         }
2068
2069         case LFUN_SCREEN_DOWN_SELECT: {
2070                 // FIXME: why is the algorithm different from LFUN_SCREEN_DOWN?
2071                 cur.selHandle(true);
2072                 if (isBottomScreen()) {
2073                         lyx::dispatch(FuncRequest(LFUN_BUFFER_END_SELECT));
2074                         cur.finishUndo();
2075                         break;
2076                 }
2077                 int y = getPos(cur).y_;
2078                 int const ymax = y + height_ - defaultRowHeight();
2079                 while (y < ymax && cur.down())
2080                         y = getPos(cur).y_;
2081
2082                 cur.finishUndo();
2083                 dr.screenUpdate(Update::SinglePar | Update::FitCursor);
2084                 break;
2085         }
2086
2087
2088         case LFUN_INSET_SELECT_ALL: {
2089                 // true if all cells are selected
2090                 bool const all_selected = cur.depth() > 1
2091                     && cur.selBegin().at_begin()
2092                     && cur.selEnd().at_end();
2093                 // true if some cells are selected
2094                 bool const cells_selected = cur.depth() > 1
2095                     && cur.selBegin().at_cell_begin()
2096                         && cur.selEnd().at_cell_end();
2097                 if (all_selected || (cells_selected && !cur.inset().isTable())) {
2098                         // All the contents of the inset if selected, or only at
2099                         // least one cell but inset is not a table.
2100                         // Select the inset from outside.
2101                         cur.pop();
2102                         cur.resetAnchor();
2103                         cur.selection(true);
2104                         cur.posForward();
2105                 } else if (cells_selected) {
2106                         // At least one complete cell is selected and inset is a table.
2107                         // Select all cells
2108                         cur.idx() = 0;
2109                         cur.pit() = 0;
2110                         cur.pos() = 0;
2111                         cur.resetAnchor();
2112                         cur.selection(true);
2113                         cur.idx() = cur.lastidx();
2114                         cur.pit() = cur.lastpit();
2115                         cur.pos() = cur.lastpos();
2116                 } else {
2117                         // select current cell
2118                         cur.pit() = 0;
2119                         cur.pos() = 0;
2120                         cur.resetAnchor();
2121                         cur.selection(true);
2122                         cur.pit() = cur.lastpit();
2123                         cur.pos() = cur.lastpos();
2124                 }
2125                 cur.setCurrentFont();
2126                 dr.screenUpdate(Update::Force);
2127                 break;
2128         }
2129
2130
2131         case LFUN_UNICODE_INSERT: {
2132                 if (cmd.argument().empty())
2133                         break;
2134
2135                 FuncCode code = cur.inset().currentMode() == Inset::MATH_MODE ?
2136                         LFUN_MATH_INSERT : LFUN_SELF_INSERT;
2137                 int i = 0;
2138                 while (true) {
2139                         docstring const arg = from_utf8(cmd.getArg(i));
2140                         if (arg.empty())
2141                                 break;
2142                         if (!isHex(arg)) {
2143                                 LYXERR0("Not a hexstring: " << arg);
2144                                 ++i;
2145                                 continue;
2146                         }
2147                         char_type c = hexToInt(arg);
2148                         if (c >= 32 && c < 0x10ffff) {
2149                                 LYXERR(Debug::KEY, "Inserting c: " << c);
2150                                 lyx::dispatch(FuncRequest(code, docstring(1, c)));
2151                         }
2152                         ++i;
2153                 }
2154                 break;
2155         }
2156
2157
2158         // This would be in Buffer class if only Cursor did not
2159         // require a bufferview
2160         case LFUN_INSET_FORALL: {
2161                 docstring const name = from_utf8(cmd.getArg(0));
2162                 string const commandstr = cmd.getLongArg(1);
2163                 FuncRequest const fr = lyxaction.lookupFunc(commandstr);
2164
2165                 // an arbitrary number to limit number of iterations
2166                 const int max_iter = 100000;
2167                 int iterations = 0;
2168                 Cursor & bvcur = d->cursor_;
2169                 Cursor const savecur = bvcur;
2170                 bvcur.reset();
2171                 if (!bvcur.nextInset())
2172                         bvcur.forwardInset();
2173                 bvcur.beginUndoGroup();
2174                 while(bvcur && iterations < max_iter) {
2175                         Inset * const ins = bvcur.nextInset();
2176                         if (!ins)
2177                                 break;
2178                         docstring insname = ins->layoutName();
2179                         while (!insname.empty()) {
2180                                 if (insname == name || name == from_utf8("*")) {
2181                                         lyx::dispatch(fr, dr);
2182                                         // we do not want to remember selection here
2183                                         bvcur.clearSelection();
2184                                         ++iterations;
2185                                         break;
2186                                 }
2187                                 size_t const i = insname.rfind(':');
2188                                 if (i == string::npos)
2189                                         break;
2190                                 insname = insname.substr(0, i);
2191                         }
2192                         // if we did not delete the inset, skip it
2193                         if (!bvcur.nextInset() || bvcur.nextInset() == ins)
2194                                 bvcur.forwardInset();
2195                 }
2196                 bvcur = savecur;
2197                 bvcur.fixIfBroken();
2198                 /** This is a dummy undo record only to remember the cursor
2199                  * that has just been set; this will be used on a redo action
2200                  * (see ticket #10097)
2201
2202                  * FIXME: a better fix would be to have a way to set the
2203                  * cursor value directly, but I am not sure it is worth it.
2204                  */
2205                 bvcur.recordUndo();
2206                 bvcur.endUndoGroup();
2207                 dr.screenUpdate(Update::Force);
2208                 dr.forceBufferUpdate();
2209
2210                 if (iterations >= max_iter) {
2211                         dr.setError(true);
2212                         dr.setMessage(bformat(_("`inset-forall' interrupted because number of actions is larger than %1$d"), max_iter));
2213                 } else
2214                         dr.setMessage(bformat(_("Applied \"%1$s\" to %2$d insets"), from_utf8(commandstr), iterations));
2215                 break;
2216         }
2217
2218
2219         case LFUN_BRANCH_ADD_INSERT: {
2220                 docstring branch_name = from_utf8(cmd.getArg(0));
2221                 if (branch_name.empty())
2222                         if (!Alert::askForText(branch_name, _("Branch name")) ||
2223                                                 branch_name.empty())
2224                                 break;
2225
2226                 DispatchResult drtmp;
2227                 buffer_.dispatch(FuncRequest(LFUN_BRANCH_ADD, branch_name), drtmp);
2228                 if (drtmp.error()) {
2229                         Alert::warning(_("Branch already exists"), drtmp.message());
2230                         break;
2231                 }
2232                 docstring const sep = buffer_.params().branchlist().separator();
2233                 for (docstring const & branch : getVectorFromString(branch_name, sep))
2234                         lyx::dispatch(FuncRequest(LFUN_BRANCH_INSERT, branch));
2235                 break;
2236         }
2237
2238         case LFUN_KEYMAP_OFF:
2239                 getIntl().keyMapOn(false);
2240                 break;
2241
2242         case LFUN_KEYMAP_PRIMARY:
2243                 getIntl().keyMapPrim();
2244                 break;
2245
2246         case LFUN_KEYMAP_SECONDARY:
2247                 getIntl().keyMapSec();
2248                 break;
2249
2250         case LFUN_KEYMAP_TOGGLE:
2251                 getIntl().toggleKeyMap();
2252                 break;
2253
2254         case LFUN_DIALOG_SHOW_NEW_INSET: {
2255                 string const name = cmd.getArg(0);
2256                 string data = trim(to_utf8(cmd.argument()).substr(name.size()));
2257                 if (decodeInsetParam(name, data, buffer_))
2258                         lyx::dispatch(FuncRequest(LFUN_DIALOG_SHOW, name + " " + data));
2259                 else
2260                         lyxerr << "Inset type '" << name <<
2261                         "' not recognized in LFUN_DIALOG_SHOW_NEW_INSET" <<  endl;
2262                 break;
2263         }
2264
2265         case LFUN_CITATION_INSERT: {
2266                 if (argument.empty()) {
2267                         lyx::dispatch(FuncRequest(LFUN_DIALOG_SHOW_NEW_INSET, "citation"));
2268                         break;
2269                 }
2270                 // we can have one optional argument, delimited by '|'
2271                 // citation-insert <key>|<text_before>
2272                 // this should be enhanced to also support text_after
2273                 // and citation style
2274                 string arg = argument;
2275                 string opt1;
2276                 if (contains(argument, "|")) {
2277                         arg = token(argument, '|', 0);
2278                         opt1 = token(argument, '|', 1);
2279                 }
2280
2281                 // if our cursor is directly in front of or behind a citation inset,
2282                 // we will instead add the new key to it.
2283                 Inset * inset = cur.nextInset();
2284                 if (!inset || inset->lyxCode() != CITE_CODE)
2285                         inset = cur.prevInset();
2286                 if (inset && inset->lyxCode() == CITE_CODE) {
2287                         InsetCitation * icite = static_cast<InsetCitation *>(inset);
2288                         if (icite->addKey(arg)) {
2289                                 dr.forceBufferUpdate();
2290                                 dr.screenUpdate(Update::FitCursor | Update::SinglePar);
2291                                 if (!opt1.empty())
2292                                         LYXERR0("Discarding optional argument to citation-insert.");
2293                         }
2294                         dispatched = true;
2295                         break;
2296                 }
2297                 InsetCommandParams icp(CITE_CODE);
2298                 icp["key"] = from_utf8(arg);
2299                 if (!opt1.empty())
2300                         icp["before"] = from_utf8(opt1);
2301                 icp["literal"] =
2302                         from_ascii(InsetCitation::last_literal ? "true" : "false");
2303                 string icstr = InsetCommand::params2string(icp);
2304                 FuncRequest fr(LFUN_INSET_INSERT, icstr);
2305                 lyx::dispatch(fr);
2306
2307                 // if the request comes from the LyX server, then we
2308                 // return a list of the undefined keys, in case some
2309                 // action could be taken.
2310                 if (cmd.origin() != FuncRequest::LYXSERVER)
2311                         break;
2312
2313                 vector<docstring> keys = getVectorFromString(from_utf8(arg));
2314                 vector<docstring>::iterator it = keys.begin();
2315                 vector<docstring>::const_iterator end = keys.end();
2316
2317                 BiblioInfo const & bibInfo = buffer_.masterBibInfo();
2318                 const BiblioInfo::const_iterator bibEnd = bibInfo.end();
2319                 while (it != end) {
2320                         if (bibInfo.find(*it) != bibEnd) {
2321                                 it = keys.erase(it);
2322                                 end = keys.end();
2323                         } else
2324                                 ++it;
2325                 }
2326                 dr.setMessage(getStringFromVector(keys));
2327
2328                 break;
2329         }
2330
2331         case LFUN_INSET_APPLY: {
2332                 string const name = cmd.getArg(0);
2333                 Inset * inset = editedInset(name);
2334                 if (!inset) {
2335                         FuncRequest fr(LFUN_INSET_INSERT, cmd.argument());
2336                         lyx::dispatch(fr);
2337                         break;
2338                 }
2339                 // put cursor in front of inset.
2340                 if (!setCursorFromInset(inset)) {
2341                         LASSERT(false, break);
2342                 }
2343                 cur.recordUndo();
2344                 FuncRequest fr(LFUN_INSET_MODIFY, cmd.argument());
2345                 inset->dispatch(cur, fr);
2346                 dr.screenUpdate(cur.result().screenUpdate());
2347                 if (cur.result().needBufferUpdate())
2348                         dr.forceBufferUpdate();
2349                 break;
2350         }
2351
2352         // FIXME:
2353         // The change of language of buffer belongs to the Buffer class.
2354         // We have to do it here because we need a cursor for Undo.
2355         // When Undo::recordUndoBufferParams() is implemented someday
2356         // LFUN_BUFFER_LANGUAGE should be handled by the Buffer class.
2357         case LFUN_BUFFER_LANGUAGE: {
2358                 Language const * oldL = buffer_.params().language;
2359                 Language const * newL = languages.getLanguage(argument);
2360                 if (!newL || oldL == newL)
2361                         break;
2362                 if (oldL->rightToLeft() == newL->rightToLeft()) {
2363                         cur.recordUndoFullBuffer();
2364                         buffer_.changeLanguage(oldL, newL);
2365                         cur.setCurrentFont();
2366                         dr.forceBufferUpdate();
2367                 }
2368                 break;
2369         }
2370
2371         case LFUN_FILE_INSERT_PLAINTEXT_PARA:
2372         case LFUN_FILE_INSERT_PLAINTEXT: {
2373                 bool const as_paragraph = (act == LFUN_FILE_INSERT_PLAINTEXT_PARA);
2374                 string const fname = to_utf8(cmd.argument());
2375                 if (!FileName::isAbsolute(fname))
2376                         dr.setMessage(_("Absolute filename expected."));
2377                 else
2378                         insertPlaintextFile(FileName(fname), as_paragraph);
2379                 break;
2380         }
2381
2382         case LFUN_COPY:
2383                 // With multi-cell table content, we pass down to the inset
2384                 if (cur.inTexted() && cur.selection()
2385                     && cur.selectionBegin().idx() != cur.selectionEnd().idx()) {
2386                         buffer_.dispatch(cmd, dr);
2387                         dispatched = dr.dispatched();
2388                         break;
2389                 }
2390                 cap::copySelection(cur);
2391                 cur.message(_("Copy"));
2392                 break;
2393
2394         default:
2395                 // OK, so try the Buffer itself...
2396                 buffer_.dispatch(cmd, dr);
2397                 dispatched = dr.dispatched();
2398                 break;
2399         }
2400
2401         buffer_.undo().endUndoGroup();
2402         dr.dispatched(dispatched);
2403
2404         // NOTE: The code below is copied from Cursor::dispatch. If you
2405         // need to modify this, please update the other one too.
2406
2407         // notify insets we just entered/left
2408         if (cursor() != old) {
2409                 old.beginUndoGroup();
2410                 old.fixIfBroken();
2411                 bool badcursor = notifyCursorLeavesOrEnters(old, cursor());
2412                 if (badcursor) {
2413                         cursor().fixIfBroken();
2414                         resetInlineCompletionPos();
2415                 }
2416                 old.endUndoGroup();
2417         }
2418 }
2419
2420
2421 docstring BufferView::requestSelection()
2422 {
2423         Cursor & cur = d->cursor_;
2424
2425         LYXERR(Debug::SELECTION, "requestSelection: cur.selection: " << cur.selection());
2426         if (!cur.selection()) {
2427                 d->xsel_cache_.set = false;
2428                 return docstring();
2429         }
2430
2431         LYXERR(Debug::SELECTION, "requestSelection: xsel_cache.set: " << d->xsel_cache_.set);
2432         if (!d->xsel_cache_.set ||
2433             cur.top() != d->xsel_cache_.cursor ||
2434             cur.realAnchor().top() != d->xsel_cache_.anchor)
2435         {
2436                 d->xsel_cache_.cursor = cur.top();
2437                 d->xsel_cache_.anchor = cur.realAnchor().top();
2438                 d->xsel_cache_.set = cur.selection();
2439                 return cur.selectionAsString(false);
2440         }
2441         return docstring();
2442 }
2443
2444
2445 void BufferView::clearSelection()
2446 {
2447         d->cursor_.clearSelection();
2448         // Clear the selection buffer. Otherwise a subsequent
2449         // middle-mouse-button paste would use the selection buffer,
2450         // not the more current external selection.
2451         cap::clearSelection();
2452         d->xsel_cache_.set = false;
2453         // The buffer did not really change, but this causes the
2454         // redraw we need because we cleared the selection above.
2455         buffer_.changed(false);
2456 }
2457
2458
2459 void BufferView::resize(int width, int height)
2460 {
2461         // Update from work area
2462         width_ = width;
2463         height_ = height;
2464
2465         // Clear the paragraph height cache.
2466         d->par_height_.clear();
2467         // Redo the metrics.
2468         updateMetrics();
2469 }
2470
2471
2472 Inset const * BufferView::getCoveringInset(Text const & text,
2473                 int x, int y) const
2474 {
2475         TextMetrics & tm = d->text_metrics_[&text];
2476         Inset * inset = tm.checkInsetHit(x, y);
2477         if (!inset)
2478                 return nullptr;
2479
2480         if (!inset->descendable(*this))
2481                 // No need to go further down if the inset is not
2482                 // descendable.
2483                 return inset;
2484
2485         size_t cell_number = inset->nargs();
2486         // Check all the inner cell.
2487         for (size_t i = 0; i != cell_number; ++i) {
2488                 Text const * inner_text = inset->getText(i);
2489                 if (inner_text) {
2490                         // Try deeper.
2491                         Inset const * inset_deeper =
2492                                 getCoveringInset(*inner_text, x, y);
2493                         if (inset_deeper)
2494                                 return inset_deeper;
2495                 }
2496         }
2497
2498         return inset;
2499 }
2500
2501
2502 Inset const * BufferView::clickableMathInset(InsetMathNest const * inset,
2503                 CoordCache::Insets const & inset_cache, int x, int y) const
2504 {
2505         for (size_t i = 0; i < inset->nargs(); ++i) {
2506                 MathData const & ar = inset->cell(i);
2507                 for (size_t j = 0; j < ar.size(); ++j) {
2508                         string const name = lyxerr.debugging(Debug::MATHED)
2509                                 ? insetName(ar[j].nucleus()->lyxCode())
2510                                 : string();
2511                         LYXERR(Debug::MATHED, "Checking inset: " << name);
2512                         if (ar[j].nucleus()->clickable(*this, x, y)) {
2513                                 if (inset_cache.covers(ar[j].nucleus(), x, y)) {
2514                                         LYXERR(Debug::MATHED, "Clickable inset: "
2515                                                << name);
2516                                         return ar[j].nucleus();
2517                                 }
2518                         }
2519                         InsetMathNest const * imn =
2520                                 ar[j].nucleus()->asNestInset();
2521                         if (imn) {
2522                                 Inset const * inner =
2523                                         clickableMathInset(imn, inset_cache, x, y);
2524                                 if (inner)
2525                                         return inner;
2526                         }
2527                 }
2528         }
2529         return nullptr;
2530 }
2531
2532
2533 void BufferView::updateHoveredInset() const
2534 {
2535         // Get inset under mouse, if there is one.
2536         int const x = d->mouse_position_cache_.x_;
2537         int const y = d->mouse_position_cache_.y_;
2538         Inset const * covering_inset = getCoveringInset(buffer_.text(), x, y);
2539         if (covering_inset && covering_inset->asInsetMath()) {
2540                 Inset const * inner_inset = clickableMathInset(
2541                                 covering_inset->asInsetMath()->asNestInset(),
2542                                 coordCache().getInsets(), x, y);
2543                 if (inner_inset)
2544                         covering_inset = inner_inset;
2545         }
2546
2547         d->clickable_inset_ = covering_inset && covering_inset->clickable(*this, x, y);
2548
2549         if (covering_inset == d->last_inset_)
2550                 // Same inset, no need to do anything...
2551                 return;
2552
2553         bool need_redraw = false;
2554         if (d->last_inset_) {
2555                 // Remove the hint on the last hovered inset (if any).
2556                 need_redraw |= d->last_inset_->setMouseHover(this, false);
2557                 d->last_inset_ = nullptr;
2558         }
2559
2560         if (covering_inset && covering_inset->setMouseHover(this, true)) {
2561                 need_redraw = true;
2562                 // Only the insets that accept the hover state, do
2563                 // clear the last_inset_, so only set the last_inset_
2564                 // member if the hovered setting is accepted.
2565                 d->last_inset_ = covering_inset;
2566         }
2567
2568         if (need_redraw) {
2569                 LYXERR(Debug::PAINTING, "Mouse hover detected at: ("
2570                                 << d->mouse_position_cache_.x_ << ", "
2571                                 << d->mouse_position_cache_.y_ << ")");
2572
2573                 d->update_strategy_ = DecorationUpdate;
2574
2575                 // This event (moving without mouse click) is not passed further.
2576                 // This should be changed if it is further utilized.
2577                 buffer_.changed(false);
2578         }
2579 }
2580
2581
2582 void BufferView::clearLastInset(Inset * inset) const
2583 {
2584         if (d->last_inset_ != inset) {
2585                 LYXERR0("Wrong last_inset!");
2586                 LATTEST(false);
2587         }
2588         d->last_inset_ = nullptr;
2589 }
2590
2591
2592 bool BufferView::mouseSelecting() const
2593 {
2594         return d->mouse_selecting_;
2595 }
2596
2597
2598 void BufferView::mouseEventDispatch(FuncRequest const & cmd0)
2599 {
2600         //lyxerr << "[ cmd0 " << cmd0 << "]" << endl;
2601
2602         // This is only called for mouse related events including
2603         // LFUN_FILE_OPEN generated by drag-and-drop.
2604         FuncRequest cmd = cmd0;
2605
2606         Cursor old = cursor();
2607         Cursor cur(*this);
2608         cur.push(buffer_.inset());
2609         cur.selection(d->cursor_.selection());
2610
2611         // Either the inset under the cursor or the
2612         // surrounding Text will handle this event.
2613
2614         // make sure we stay within the screen...
2615         cmd.set_y(min(max(cmd.y(), -1), height_));
2616
2617         d->mouse_position_cache_.x_ = cmd.x();
2618         d->mouse_position_cache_.y_ = cmd.y();
2619
2620         d->mouse_selecting_ =
2621                 cmd.action() == LFUN_MOUSE_MOTION && cmd.button() == mouse_button::button1;
2622
2623         if (cmd.action() == LFUN_MOUSE_MOTION && cmd.button() == mouse_button::none) {
2624                 updateHoveredInset();
2625                 return;
2626         }
2627
2628         // Build temporary cursor.
2629         Inset * inset = d->text_metrics_[&buffer_.text()].editXY(cur, cmd.x(), cmd.y());
2630         if (inset) {
2631                 // If inset is not editable, cur.pos() might point behind the
2632                 // inset (depending on cmd.x(), cmd.y()). This is needed for
2633                 // editing to fix bug 9628, but e.g. the context menu needs a
2634                 // cursor in front of the inset.
2635                 if ((inset->hasSettings() || !inset->contextMenuName().empty()
2636                      || inset->lyxCode() == SEPARATOR_CODE) &&
2637                     cur.nextInset() != inset && cur.prevInset() == inset)
2638                         cur.posBackward();
2639         } else if (cur.inTexted() && cur.pos()
2640                         && cur.paragraph().isEnvSeparator(cur.pos() - 1)) {
2641                 // Always place cursor in front of a separator inset.
2642                 cur.posBackward();
2643         }
2644
2645         // Put anchor at the same position.
2646         cur.resetAnchor();
2647
2648         cur.beginUndoGroup();
2649
2650         // Try to dispatch to an non-editable inset near this position
2651         // via the temp cursor. If the inset wishes to change the real
2652         // cursor it has to do so explicitly by using
2653         //  cur.bv().cursor() = cur;  (or similar)
2654         if (inset)
2655                 inset->dispatch(cur, cmd);
2656
2657         // Now dispatch to the temporary cursor. If the real cursor should
2658         // be modified, the inset's dispatch has to do so explicitly.
2659         if (!inset || !cur.result().dispatched())
2660                 cur.dispatch(cmd);
2661
2662         // Notify left insets
2663         if (cur != old) {
2664                 bool badcursor = old.fixIfBroken() || cur.fixIfBroken();
2665                 badcursor = badcursor || notifyCursorLeavesOrEnters(old, cur);
2666                 if (badcursor)
2667                         cursor().fixIfBroken();
2668         }
2669
2670         cur.endUndoGroup();
2671
2672         // Do we have a selection?
2673         theSelection().haveSelection(cursor().selection());
2674
2675         if (cur.needBufferUpdate() || buffer().needUpdate()) {
2676                 cur.clearBufferUpdate();
2677                 buffer().updateBuffer();
2678         }
2679
2680         // If the command has been dispatched,
2681         if (cur.result().dispatched() || cur.result().screenUpdate())
2682                 processUpdateFlags(cur.result().screenUpdate());
2683 }
2684
2685
2686 int BufferView::minVisiblePart()
2687 {
2688         return 2 * defaultRowHeight();
2689 }
2690
2691
2692 int BufferView::scroll(int pixels)
2693 {
2694         if (pixels > 0)
2695                 return scrollDown(pixels);
2696         if (pixels < 0)
2697                 return scrollUp(-pixels);
2698         return 0;
2699 }
2700
2701
2702 int BufferView::scrollDown(int pixels)
2703 {
2704         Text * text = &buffer_.text();
2705         TextMetrics & tm = d->text_metrics_[text];
2706         int const ymax = height_ + pixels;
2707         while (true) {
2708                 pair<pit_type, ParagraphMetrics const *> last = tm.last();
2709                 int bottom_pos = last.second->position() + last.second->descent();
2710                 if (lyxrc.scroll_below_document)
2711                         bottom_pos += height_ - minVisiblePart();
2712                 if (last.first + 1 == int(text->paragraphs().size())) {
2713                         if (bottom_pos <= height_)
2714                                 return 0;
2715                         pixels = min(pixels, bottom_pos - height_);
2716                         break;
2717                 }
2718                 if (bottom_pos > ymax)
2719                         break;
2720                 tm.newParMetricsDown();
2721         }
2722         d->anchor_ypos_ -= pixels;
2723         return -pixels;
2724 }
2725
2726
2727 int BufferView::scrollUp(int pixels)
2728 {
2729         Text * text = &buffer_.text();
2730         TextMetrics & tm = d->text_metrics_[text];
2731         int ymin = - pixels;
2732         while (true) {
2733                 pair<pit_type, ParagraphMetrics const *> first = tm.first();
2734                 int top_pos = first.second->position() - first.second->ascent();
2735                 if (first.first == 0) {
2736                         if (top_pos >= 0)
2737                                 return 0;
2738                         pixels = min(pixels, - top_pos);
2739                         break;
2740                 }
2741                 if (top_pos < ymin)
2742                         break;
2743                 tm.newParMetricsUp();
2744         }
2745         d->anchor_ypos_ += pixels;
2746         return pixels;
2747 }
2748
2749
2750 bool BufferView::setCursorFromRow(int row)
2751 {
2752         TexRow::TextEntry start, end;
2753         tie(start,end) = buffer_.texrow().getEntriesFromRow(row);
2754         LYXERR(Debug::OUTFILE,
2755                "setCursorFromRow: for row " << row << ", TexRow has found "
2756                "start (id=" << start.id << ",pos=" << start.pos << "), "
2757                "end (id=" << end.id << ",pos=" << end.pos << ")");
2758         return setCursorFromEntries(start, end);
2759 }
2760
2761
2762 bool BufferView::setCursorFromEntries(TexRow::TextEntry start,
2763                                       TexRow::TextEntry end)
2764 {
2765         DocIterator dit_start, dit_end;
2766         tie(dit_start,dit_end) =
2767                 TexRow::getDocIteratorsFromEntries(start, end, buffer_);
2768         if (!dit_start)
2769                 return false;
2770         // Setting selection start
2771         d->cursor_.clearSelection();
2772         setCursor(dit_start);
2773         // Setting selection end
2774         if (dit_end) {
2775                 d->cursor_.resetAnchor();
2776                 setCursorSelectionTo(dit_end);
2777         }
2778         return true;
2779 }
2780
2781
2782 bool BufferView::setCursorFromInset(Inset const * inset)
2783 {
2784         // are we already there?
2785         if (cursor().nextInset() == inset)
2786                 return true;
2787
2788         // Inset is not at cursor position. Find it in the document.
2789         Cursor cur(*this);
2790         cur.reset();
2791         while (cur && cur.nextInset() != inset)
2792                 cur.forwardInset();
2793
2794         if (cur) {
2795                 setCursor(cur);
2796                 return true;
2797         }
2798         return false;
2799 }
2800
2801
2802 void BufferView::gotoLabel(docstring const & label)
2803 {
2804         FuncRequest action;
2805         bool have_inactive = false;
2806         for (Buffer const * buf : buffer().allRelatives()) {
2807                 // find label
2808                 for (TocItem const & item : *buf->tocBackend().toc("label")) {
2809                         if (label == item.str() && item.isOutput()) {
2810                                 lyx::dispatch(item.action());
2811                                 return;
2812                         }
2813                         // If we find an inactive label, save it for the case
2814                         // that no active one is there
2815                         if (label == item.str() && !have_inactive) {
2816                                 have_inactive = true;
2817                                 action = item.action();
2818                         }
2819                 }
2820         }
2821         // We only found an inactive label. Go there.
2822         if (have_inactive)
2823                 lyx::dispatch(action);
2824 }
2825
2826
2827 TextMetrics const & BufferView::textMetrics(Text const * t) const
2828 {
2829         return const_cast<BufferView *>(this)->textMetrics(t);
2830 }
2831
2832
2833 TextMetrics & BufferView::textMetrics(Text const * t)
2834 {
2835         LBUFERR(t);
2836         TextMetricsCache::iterator tmc_it  = d->text_metrics_.find(t);
2837         if (tmc_it == d->text_metrics_.end()) {
2838                 tmc_it = d->text_metrics_.emplace(std::piecewise_construct,
2839                                 std::forward_as_tuple(t),
2840                                 std::forward_as_tuple(this, const_cast<Text *>(t))).first;
2841         }
2842         return tmc_it->second;
2843 }
2844
2845
2846 ParagraphMetrics const & BufferView::parMetrics(Text const * t,
2847                 pit_type pit) const
2848 {
2849         return textMetrics(t).parMetrics(pit);
2850 }
2851
2852
2853 int BufferView::workHeight() const
2854 {
2855         return height_;
2856 }
2857
2858
2859 void BufferView::setCursor(DocIterator const & dit)
2860 {
2861         d->cursor_.reset();
2862         size_t const n = dit.depth();
2863         for (size_t i = 0; i < n; ++i)
2864                 dit[i].inset().edit(d->cursor_, true);
2865
2866         d->cursor_.setCursor(dit);
2867         d->cursor_.selection(false);
2868         d->cursor_.setCurrentFont();
2869         // FIXME
2870         // It seems on general grounds as if this is probably needed, but
2871         // it is not yet clear.
2872         // See bug #7394 and r38388.
2873         // d->cursor.resetAnchor();
2874 }
2875
2876
2877 void BufferView::setCursorSelectionTo(DocIterator const & dit)
2878 {
2879         size_t const n = dit.depth();
2880         for (size_t i = 0; i < n; ++i)
2881                 dit[i].inset().edit(d->cursor_, true);
2882
2883         d->cursor_.selection(true);
2884         d->cursor_.setCursorSelectionTo(dit);
2885         d->cursor_.setCurrentFont();
2886 }
2887
2888
2889 bool BufferView::checkDepm(Cursor & cur, Cursor & old)
2890 {
2891         // Would be wrong to delete anything if we have a selection.
2892         if (cur.selection())
2893                 return false;
2894
2895         bool need_anchor_change = false;
2896         bool changed = Text::deleteEmptyParagraphMechanism(cur, old,
2897                 need_anchor_change);
2898
2899         if (need_anchor_change)
2900                 cur.resetAnchor();
2901
2902         if (!changed)
2903                 return false;
2904
2905         d->cursor_ = cur;
2906
2907         // we would rather not do this here, but it needs to be done before
2908         // the changed() signal is sent.
2909         buffer_.updateBuffer();
2910
2911         buffer_.changed(true);
2912         return true;
2913 }
2914
2915
2916 bool BufferView::mouseSetCursor(Cursor & cur, bool const select)
2917 {
2918         LASSERT(&cur.bv() == this, return false);
2919
2920         if (!select)
2921                 // this event will clear selection so we save selection for
2922                 // persistent selection
2923                 cap::saveSelection(cursor());
2924
2925         d->cursor_.macroModeClose();
2926         // If a macro has been finalized, the cursor might have been broken
2927         cur.fixIfBroken();
2928
2929         // Has the cursor just left the inset?
2930         bool const leftinset = (&d->cursor_.inset() != &cur.inset());
2931         if (leftinset)
2932                 d->cursor_.fixIfBroken();
2933
2934         // do the dEPM magic if needed
2935         // FIXME: (1) move this to InsetText::notifyCursorLeaves?
2936         // FIXME: (2) if we had a working InsetText::notifyCursorLeaves,
2937         // the leftinset bool would not be necessary (badcursor instead).
2938         bool update = leftinset;
2939
2940         if (select) {
2941                 d->cursor_.setSelection();
2942                 d->cursor_.setCursorSelectionTo(cur);
2943         } else {
2944                 if (d->cursor_.inTexted())
2945                         update |= checkDepm(cur, d->cursor_);
2946                 d->cursor_.resetAnchor();
2947                 d->cursor_.setCursor(cur);
2948                 d->cursor_.clearSelection();
2949         }
2950         d->cursor_.boundary(cur.boundary());
2951         d->cursor_.finishUndo();
2952         d->cursor_.setCurrentFont();
2953         if (update)
2954                 cur.forceBufferUpdate();
2955         return update;
2956 }
2957
2958
2959 void BufferView::putSelectionAt(DocIterator const & cur,
2960                                 int length, bool backwards)
2961 {
2962         d->cursor_.clearSelection();
2963
2964         setCursor(cur);
2965
2966         if (length) {
2967                 if (backwards) {
2968                         d->cursor_.pos() += length;
2969                         d->cursor_.setSelection(d->cursor_, -length);
2970                 } else
2971                         d->cursor_.setSelection(d->cursor_, length);
2972         }
2973 }
2974
2975
2976 bool BufferView::selectIfEmpty(DocIterator & cur)
2977 {
2978         if ((cur.inTexted() && !cur.paragraph().empty())
2979             || (cur.inMathed() && !cur.cell().empty()))
2980                 return false;
2981
2982         pit_type const beg_pit = cur.pit();
2983         if (beg_pit > 0) {
2984                 // The paragraph associated to this item isn't
2985                 // the first one, so it can be selected
2986                 cur.backwardPos();
2987         } else {
2988                 // We have to resort to select the space between the
2989                 // end of this item and the begin of the next one
2990                 cur.forwardPos();
2991         }
2992         if (cur.empty()) {
2993                 // If it is the only item in the document,
2994                 // nothing can be selected
2995                 return false;
2996         }
2997         pit_type const end_pit = cur.pit();
2998         pos_type const end_pos = cur.pos();
2999         d->cursor_.clearSelection();
3000         d->cursor_.reset();
3001         d->cursor_.setCursor(cur);
3002         d->cursor_.pit() = beg_pit;
3003         d->cursor_.pos() = 0;
3004         d->cursor_.selection(false);
3005         d->cursor_.resetAnchor();
3006         d->cursor_.pit() = end_pit;
3007         d->cursor_.pos() = end_pos;
3008         d->cursor_.setSelection();
3009         return true;
3010 }
3011
3012
3013 Cursor & BufferView::cursor()
3014 {
3015         return d->cursor_;
3016 }
3017
3018
3019 Cursor const & BufferView::cursor() const
3020 {
3021         return d->cursor_;
3022 }
3023
3024
3025 bool BufferView::singleParUpdate()
3026 {
3027         Text & buftext = buffer_.text();
3028         pit_type const bottom_pit = d->cursor_.bottom().pit();
3029         TextMetrics & tm = textMetrics(&buftext);
3030         Dimension const old_dim = tm.parMetrics(bottom_pit).dim();
3031
3032         // make sure inline completion pointer is ok
3033         if (d->inlineCompletionPos_.fixIfBroken())
3034                 d->inlineCompletionPos_ = DocIterator();
3035
3036         // In Single Paragraph mode, rebreak only
3037         // the (main text, not inset!) paragraph containing the cursor.
3038         // (if this paragraph contains insets etc., rebreaking will
3039         // recursively descend)
3040         tm.redoParagraph(bottom_pit);
3041         ParagraphMetrics & pm = tm.parMetrics(bottom_pit);
3042         if (pm.height() != old_dim.height()) {
3043                 // Paragraph height has changed so we cannot proceed to
3044                 // the singlePar optimisation.
3045                 return false;
3046         }
3047         // Since position() points to the baseline of the first row, we
3048         // may have to update it. See ticket #11601 for an example where
3049         // the height does not change but the ascent does.
3050         pm.setPosition(pm.position() - old_dim.ascent() + pm.ascent());
3051
3052         tm.updatePosCache(bottom_pit);
3053
3054         LYXERR(Debug::PAINTING, "\ny1: " << pm.position() - pm.ascent()
3055                 << " y2: " << pm.position() + pm.descent()
3056                 << " pit: " << bottom_pit
3057                 << " singlepar: 1");
3058         return true;
3059 }
3060
3061
3062 void BufferView::updateMetrics()
3063 {
3064         updateMetrics(d->update_flags_);
3065         d->update_strategy_ = FullScreenUpdate;
3066 }
3067
3068
3069 void BufferView::updateMetrics(Update::flags & update_flags)
3070 {
3071         if (height_ == 0 || width_ == 0)
3072                 return;
3073
3074         Text & buftext = buffer_.text();
3075         pit_type const npit = int(buftext.paragraphs().size());
3076
3077         // Clear out the position cache in case of full screen redraw,
3078         d->coord_cache_.clear();
3079         d->math_rows_.clear();
3080
3081         // Clear out paragraph metrics to avoid having invalid metrics
3082         // in the cache from paragraphs not relayouted below
3083         // The complete text metrics will be redone.
3084         d->text_metrics_.clear();
3085
3086         TextMetrics & tm = textMetrics(&buftext);
3087
3088         // make sure inline completion pointer is ok
3089         if (d->inlineCompletionPos_.fixIfBroken())
3090                 d->inlineCompletionPos_ = DocIterator();
3091
3092         if (d->anchor_pit_ >= npit)
3093                 // The anchor pit must have been deleted...
3094                 d->anchor_pit_ = npit - 1;
3095
3096         // Rebreak anchor paragraph.
3097         tm.redoParagraph(d->anchor_pit_);
3098         ParagraphMetrics & anchor_pm = tm.parMetrics(d->anchor_pit_);
3099
3100         // position anchor
3101         if (d->anchor_pit_ == 0) {
3102                 int scrollRange = d->scrollbarParameters_.max - d->scrollbarParameters_.min;
3103
3104                 // Complete buffer visible? Then it's easy.
3105                 if (scrollRange == 0)
3106                         d->anchor_ypos_ = anchor_pm.ascent();
3107                 else {
3108                         // avoid empty space above the first row
3109                         d->anchor_ypos_ = min(d->anchor_ypos_, anchor_pm.ascent());
3110                 }
3111         }
3112         anchor_pm.setPosition(d->anchor_ypos_);
3113         tm.updatePosCache(d->anchor_pit_);
3114
3115         LYXERR(Debug::PAINTING, "metrics: "
3116                 << " anchor pit = " << d->anchor_pit_
3117                 << " anchor ypos = " << d->anchor_ypos_);
3118
3119         // Redo paragraphs above anchor if necessary.
3120         int y1 = d->anchor_ypos_ - anchor_pm.ascent();
3121         // We are now just above the anchor paragraph.
3122         pit_type pit1 = d->anchor_pit_ - 1;
3123         for (; pit1 >= 0 && y1 >= 0; --pit1) {
3124                 tm.redoParagraph(pit1);
3125                 ParagraphMetrics & pm = tm.parMetrics(pit1);
3126                 y1 -= pm.descent();
3127                 // Save the paragraph position in the cache.
3128                 pm.setPosition(y1);
3129                 tm.updatePosCache(pit1);
3130                 y1 -= pm.ascent();
3131         }
3132
3133         // Redo paragraphs below the anchor if necessary.
3134         int y2 = d->anchor_ypos_ + anchor_pm.descent();
3135         // We are now just below the anchor paragraph.
3136         pit_type pit2 = d->anchor_pit_ + 1;
3137         for (; pit2 < npit && y2 <= height_; ++pit2) {
3138                 tm.redoParagraph(pit2);
3139                 ParagraphMetrics & pm = tm.parMetrics(pit2);
3140                 y2 += pm.ascent();
3141                 // Save the paragraph position in the cache.
3142                 pm.setPosition(y2);
3143                 tm.updatePosCache(pit2);
3144                 y2 += pm.descent();
3145         }
3146
3147         LYXERR(Debug::PAINTING, "Metrics: "
3148                 << " anchor pit = " << d->anchor_pit_
3149                 << " anchor ypos = " << d->anchor_ypos_
3150                 << " y1 = " << y1
3151                 << " y2 = " << y2
3152                 << " pit1 = " << pit1
3153                 << " pit2 = " << pit2);
3154
3155         // metrics is done, full drawing is necessary now
3156         update_flags = (update_flags & ~Update::Force) | Update::ForceDraw;
3157
3158         // Now update the positions of insets in the cache.
3159         updatePosCache();
3160
3161         if (lyxerr.debugging(Debug::WORKAREA)) {
3162                 LYXERR(Debug::WORKAREA, "BufferView::updateMetrics");
3163                 d->coord_cache_.dump();
3164         }
3165 }
3166
3167
3168 void BufferView::updatePosCache()
3169 {
3170         // this is the "nodraw" drawing stage: only set the positions of the
3171         // insets in metrics cache.
3172         frontend::NullPainter np;
3173         draw(np, false);
3174 }
3175
3176
3177 void BufferView::insertLyXFile(FileName const & fname, bool const ignorelang)
3178 {
3179         LASSERT(d->cursor_.inTexted(), return);
3180
3181         // Get absolute path of file and add ".lyx"
3182         // to the filename if necessary
3183         FileName filename = fileSearch(string(), fname.absFileName(), "lyx");
3184
3185         docstring const disp_fn = makeDisplayPath(filename.absFileName());
3186         // emit message signal.
3187         message(bformat(_("Inserting document %1$s..."), disp_fn));
3188
3189         docstring res;
3190         Buffer buf(filename.absFileName(), false);
3191         if (buf.loadLyXFile() == Buffer::ReadSuccess) {
3192                 ErrorList & el = buffer_.errorList("Parse");
3193                 // Copy the inserted document error list into the current buffer one.
3194                 el = buf.errorList("Parse");
3195                 ParagraphList & pars = buf.paragraphs();
3196                 if (ignorelang)
3197                         // set main language of imported file to context language
3198                         buf.changeLanguage(buf.language(), d->cursor_.getFont().language());
3199                 buffer_.undo().recordUndo(d->cursor_);
3200                 cap::pasteParagraphList(d->cursor_, pars,
3201                                         buf.params().documentClassPtr(),
3202                                         buf.params().authors(), el);
3203                 res = _("Document %1$s inserted.");
3204         } else {
3205                 res = _("Could not insert document %1$s");
3206         }
3207
3208         buffer_.changed(true);
3209         // emit message signal.
3210         message(bformat(res, disp_fn));
3211 }
3212
3213
3214 Point BufferView::coordOffset(DocIterator const & dit) const
3215 {
3216         int x = 0;
3217         int y = 0;
3218         int lastw = 0;
3219
3220         // Addup contribution of nested insets, from inside to outside,
3221         // keeping the outer paragraph for a special handling below
3222         for (size_t i = dit.depth() - 1; i >= 1; --i) {
3223                 CursorSlice const & sl = dit[i];
3224                 int xx = 0;
3225                 int yy = 0;
3226
3227                 // get relative position inside sl.inset()
3228                 sl.inset().cursorPos(*this, sl, dit.boundary() && (i + 1 == dit.depth()), xx, yy);
3229
3230                 // Make relative position inside of the edited inset relative to sl.inset()
3231                 x += xx;
3232                 y += yy;
3233
3234                 // In case of an RTL inset, the edited inset will be positioned to the left
3235                 // of xx:yy
3236                 if (sl.text()) {
3237                         bool boundary_i = dit.boundary() && i + 1 == dit.depth();
3238                         bool rtl = textMetrics(sl.text()).isRTL(sl, boundary_i);
3239                         if (rtl)
3240                                 x -= lastw;
3241                 }
3242
3243                 // remember width for the case that sl.inset() is positioned in an RTL inset
3244                 lastw = sl.inset().dimension(*this).wid;
3245
3246                 //lyxerr << "Cursor::getPos, i: "
3247                 // << i << " x: " << xx << " y: " << y << endl;
3248         }
3249
3250         // Add contribution of initial rows of outermost paragraph
3251         CursorSlice const & sl = dit[0];
3252         TextMetrics const & tm = textMetrics(sl.text());
3253         ParagraphMetrics const & pm = tm.parMetrics(sl.pit());
3254
3255         LBUFERR(!pm.rows().empty());
3256         y -= pm.rows()[0].ascent();
3257 #if 1
3258         // FIXME: document this mess
3259         size_t rend;
3260         if (sl.pos() > 0 && dit.depth() == 1) {
3261                 int pos = sl.pos();
3262                 if (pos && dit.boundary())
3263                         --pos;
3264 //              lyxerr << "coordOffset: boundary:" << dit.boundary() << " depth:" << dit.depth() << " pos:" << pos << " sl.pos:" << sl.pos() << endl;
3265                 rend = pm.pos2row(pos);
3266         } else
3267                 rend = pm.pos2row(sl.pos());
3268 #else
3269         size_t rend = pm.pos2row(sl.pos());
3270 #endif
3271         for (size_t rit = 0; rit != rend; ++rit)
3272                 y += pm.rows()[rit].height();
3273         y += pm.rows()[rend].ascent();
3274
3275         TextMetrics const & bottom_tm = textMetrics(dit.bottom().text());
3276
3277         // Make relative position from the nested inset now bufferview absolute.
3278         int xx = bottom_tm.cursorX(dit.bottom(), dit.boundary() && dit.depth() == 1);
3279         x += xx;
3280
3281         // In the RTL case place the nested inset at the left of the cursor in
3282         // the outer paragraph
3283         bool boundary_1 = dit.boundary() && 1 == dit.depth();
3284         bool rtl = bottom_tm.isRTL(dit.bottom(), boundary_1);
3285         if (rtl)
3286                 x -= lastw;
3287
3288         return Point(x, y);
3289 }
3290
3291
3292 Point BufferView::getPos(DocIterator const & dit) const
3293 {
3294         if (!paragraphVisible(dit))
3295                 return Point(-1, -1);
3296
3297         CursorSlice const & bot = dit.bottom();
3298         TextMetrics const & tm = textMetrics(bot.text());
3299
3300         // offset from outer paragraph
3301         Point p = coordOffset(dit);
3302         p.y_ += tm.parMetrics(bot.pit()).position();
3303         return p;
3304 }
3305
3306
3307 bool BufferView::paragraphVisible(DocIterator const & dit) const
3308 {
3309         CursorSlice const & bot = dit.bottom();
3310         TextMetrics const & tm = textMetrics(bot.text());
3311
3312         return tm.contains(bot.pit());
3313 }
3314
3315
3316 void BufferView::caretPosAndDim(Point & p, Dimension & dim) const
3317 {
3318         Cursor const & cur = cursor();
3319         if (cur.inMathed()) {
3320                 MathRow const & mrow = mathRow(&cur.cell());
3321                 dim = mrow.caret_dim;
3322         } else {
3323                 Font const font = cur.real_current_font;
3324                 frontend::FontMetrics const & fm = theFontMetrics(font);
3325                 // lineWidth() can be 0 to mean 'thin line' on HiDpi, but the
3326                 // caret drawing code is not prepared for that.
3327                 dim.wid = max(fm.lineWidth(), 1);
3328                 dim.asc = fm.maxAscent();
3329                 dim.des = fm.maxDescent();
3330         }
3331         if (lyxrc.cursor_width > 0)
3332                 dim.wid = lyxrc.cursor_width;
3333
3334         p = getPos(cur);
3335         // center fat carets horizontally
3336         p.x_ -= dim.wid / 2;
3337         // p is top-left
3338         p.y_ -= dim.asc;
3339 }
3340
3341
3342 void BufferView::buildCaretGeometry(bool complet)
3343 {
3344         Point p;
3345         Dimension dim;
3346         caretPosAndDim(p, dim);
3347
3348         Cursor const & cur = d->cursor_;
3349         Font const & realfont = cur.real_current_font;
3350         frontend::FontMetrics const & fm = theFontMetrics(realfont.fontInfo());
3351         bool const isrtl = realfont.isVisibleRightToLeft();
3352         int const dir = isrtl ? -1 : 1;
3353
3354         frontend::CaretGeometry & cg = d->caret_geometry_;
3355         cg.shapes.clear();
3356
3357         // The caret itself, slanted for italics in text edit mode except
3358         // for selections because the selection rect does not slant
3359         bool const slant = fm.italic() && cur.inTexted() && !cur.selection();
3360         double const slope = slant ? fm.italicSlope() : 0;
3361         cg.shapes.push_back(
3362                 {{iround(p.x_ + dim.asc * slope), p.y_},
3363                  {iround(p.x_ - dim.des * slope), p.y_ + dim.height()},
3364                  {iround(p.x_ + dir * dim.wid - dim.des * slope), p.y_ + dim.height()},
3365                  {iround(p.x_ + dir * dim.wid + dim.asc * slope), p.y_}}
3366                 );
3367
3368         // The language indicator _| (if needed)
3369         Language const * doclang = buffer().params().language;
3370         if (!((realfont.language() == doclang && isrtl == doclang->rightToLeft())
3371                   || realfont.language() == latex_language)) {
3372                 int const lx = dim.height() / 3;
3373                 int const xx = iround(p.x_ - dim.des * slope);
3374                 int const yy = p.y_ + dim.height();
3375                 cg.shapes.push_back(
3376                         {{xx, yy - dim.wid},
3377                          {xx + dir * (dim.wid + lx - 1), yy - dim.wid},
3378                          {xx + dir * (dim.wid + lx - 1), yy},
3379                          {xx, yy}}
3380                         );
3381         }
3382
3383         // The completion triangle |> (if needed)
3384         if (complet) {
3385                 int const m = p.y_ + dim.height() / 2;
3386                 int const d = dim.height() / 8;
3387                 // offset for slanted carret
3388                 int const sx = iround((dim.asc - (dim.height() / 2 - d)) * slope);
3389                 // starting position x
3390                 int const xx = p.x_ + dir * dim.wid + sx;
3391                 cg.shapes.push_back(
3392                         {{xx, m - d},
3393                          {xx + dir * d, m},
3394                          {xx, m + d},
3395                          {xx, m + d - dim.wid},
3396                          {xx + dir * d - dim.wid, m},
3397                          {xx, m - d + dim.wid}}
3398                         );
3399         }
3400
3401         // compute extremal x values
3402         cg.left = 1000000;
3403         cg.right = -1000000;
3404         cg.top = 1000000;
3405         cg.bottom = -1000000;
3406         for (auto const & shape : cg.shapes)
3407                 for (Point const & p : shape) {
3408                         cg.left = min(cg.left, p.x_);
3409                         cg.right = max(cg.right, p.x_);
3410                         cg.top = min(cg.top, p.y_);
3411                         cg.bottom = max(cg.bottom, p.y_);
3412                 }
3413 }
3414
3415
3416 frontend::CaretGeometry const &  BufferView::caretGeometry() const
3417 {
3418         return d->caret_geometry_;
3419 }
3420
3421
3422 bool BufferView::caretInView() const
3423 {
3424         if (!paragraphVisible(cursor()))
3425                 return false;
3426         Point p;
3427         Dimension dim;
3428         caretPosAndDim(p, dim);
3429
3430         // does the cursor touch the screen ?
3431         if (p.y_ + dim.height() < 0 || p.y_ >= workHeight())
3432                 return false;
3433         return true;
3434 }
3435
3436
3437 int BufferView::horizScrollOffset() const
3438 {
3439         return d->horiz_scroll_offset_;
3440 }
3441
3442
3443 int BufferView::horizScrollOffset(Text const * text,
3444                                   pit_type pit, pos_type pos) const
3445 {
3446         // Is this a row that is currently scrolled?
3447         if (!d->current_row_slice_.empty()
3448             && &text->inset() == d->current_row_slice_.inset().asInsetText()
3449             && pit ==  d->current_row_slice_.pit()
3450             && pos ==  d->current_row_slice_.pos())
3451                 return d->horiz_scroll_offset_;
3452         return 0;
3453 }
3454
3455
3456 void BufferView::setCurrentRowSlice(CursorSlice const & rowSlice)
3457 {
3458         // nothing to do if the cursor was already on this row
3459         if (d->current_row_slice_ == rowSlice)
3460                 return;
3461
3462         // if the (previous) current row was scrolled, we have to
3463         // remember it in order to repaint it next time.
3464         if (d->horiz_scroll_offset_ != 0) {
3465                 // search the old row in cache and mark it changed
3466                 for (auto & tm_pair : d->text_metrics_) {
3467                         if (&tm_pair.first->inset() == rowSlice.inset().asInsetText()) {
3468                                 tm_pair.second.setRowChanged(rowSlice.pit(), rowSlice.pos());
3469                                 // We found it, no need to continue.
3470                                 break;
3471                         }
3472                 }
3473         }
3474
3475         // Since we changed row, the scroll offset is not valid anymore
3476         d->horiz_scroll_offset_ = 0;
3477         d->current_row_slice_ = rowSlice;
3478 }
3479
3480
3481 void BufferView::checkCursorScrollOffset()
3482 {
3483         CursorSlice rowSlice = d->cursor_.bottom();
3484         TextMetrics const & tm = textMetrics(rowSlice.text());
3485
3486         // Stop if metrics have not been computed yet, since it means
3487         // that there is nothing to do.
3488         if (!tm.contains(rowSlice.pit()))
3489                 return;
3490         ParagraphMetrics const & pm = tm.parMetrics(rowSlice.pit());
3491         Row const & row = pm.getRow(rowSlice.pos(),
3492                                     d->cursor_.boundary() && rowSlice == d->cursor_.top());
3493         rowSlice.pos() = row.pos();
3494
3495         // Set the row on which the cursor lives.
3496         setCurrentRowSlice(rowSlice);
3497
3498         // Current x position of the cursor in pixels
3499         int cur_x = getPos(d->cursor_).x_;
3500
3501         // Horizontal scroll offset of the cursor row in pixels
3502         int offset = d->horiz_scroll_offset_;
3503         int const MARGIN = 2 * theFontMetrics(d->cursor_.real_current_font).em()
3504                            + row.right_margin;
3505         if (row.right_x() <= workWidth() - row.right_margin) {
3506                 // Row is narrower than the work area, no offset needed.
3507                 offset = 0;
3508         } else {
3509                 if (cur_x - offset < MARGIN) {
3510                         // cursor would be too far right
3511                         offset = cur_x - MARGIN;
3512                 } else if (cur_x - offset > workWidth() - MARGIN) {
3513                         // cursor would be too far left
3514                         offset = cur_x - workWidth() + MARGIN;
3515                 }
3516                 // Correct the offset to make sure that we do not scroll too much
3517                 if (offset < 0)
3518                         offset = 0;
3519                 if (row.right_x() - offset < workWidth() - row.right_margin)
3520                         offset = row.right_x() - workWidth() + row.right_margin;
3521         }
3522
3523         //lyxerr << "cur_x=" << cur_x << ", offset=" << offset << ", row.wid=" << row.width() << ", margin=" << MARGIN << endl;
3524
3525         if (offset != d->horiz_scroll_offset_) {
3526                 LYXERR(Debug::PAINTING, "Horiz. scroll offset changed from "
3527                        << d->horiz_scroll_offset_ << " to " << offset);
3528                 row.changed(true);
3529                 if (d->update_strategy_ == NoScreenUpdate)
3530                         d->update_strategy_ = SingleParUpdate;
3531         }
3532
3533         d->horiz_scroll_offset_ = offset;
3534 }
3535
3536
3537 void BufferView::draw(frontend::Painter & pain, bool paint_caret)
3538 {
3539         if (height_ == 0 || width_ == 0)
3540                 return;
3541         LYXERR(Debug::PAINTING, (pain.isNull() ? "\t\t--- START NODRAW ---"
3542                                  : "\t\t*** START DRAWING ***"));
3543         Text & text = buffer_.text();
3544         TextMetrics const & tm = d->text_metrics_[&text];
3545         int const y = tm.first().second->position();
3546         PainterInfo pi(this, pain);
3547
3548         // Check whether the row where the cursor lives needs to be scrolled.
3549         // Update the drawing strategy if needed.
3550         checkCursorScrollOffset();
3551
3552         switch (d->update_strategy_) {
3553
3554         case NoScreenUpdate:
3555                 // no screen painting is actually needed. In nodraw stage
3556                 // however, the different coordinates of insets and paragraphs
3557                 // needs to be updated.
3558                 LYXERR(Debug::PAINTING, "Strategy: NoScreenUpdate");
3559                 if (pain.isNull()) {
3560                         pi.full_repaint = true;
3561                         tm.draw(pi, 0, y);
3562                 } else {
3563                         pi.full_repaint = false;
3564                         tm.draw(pi, 0, y);
3565                 }
3566                 break;
3567
3568         case SingleParUpdate:
3569                 pi.full_repaint = false;
3570                 LYXERR(Debug::PAINTING, "Strategy: SingleParUpdate");
3571                 // In general, only the current row of the outermost paragraph
3572                 // will be redrawn. Particular cases where selection spans
3573                 // multiple paragraph are correctly detected in TextMetrics.
3574                 tm.draw(pi, 0, y);
3575                 break;
3576
3577         case DecorationUpdate:
3578                 // FIXME: We should also distinguish DecorationUpdate to avoid text
3579                 // drawing if possible. This is not possible to do easily right now
3580                 // because of the single backing pixmap.
3581
3582         case FullScreenUpdate:
3583
3584                 LYXERR(Debug::PAINTING,
3585                        ((d->update_strategy_ == FullScreenUpdate)
3586                         ? "Strategy: FullScreenUpdate"
3587                         : "Strategy: DecorationUpdate"));
3588
3589                 // The whole screen, including insets, will be refreshed.
3590                 pi.full_repaint = true;
3591
3592                 // Clear background.
3593                 pain.fillRectangle(0, 0, width_, height_,
3594                         pi.backgroundColor(&buffer_.inset()));
3595
3596                 // Draw everything.
3597                 tm.draw(pi, 0, y);
3598
3599                 // and possibly grey out below
3600                 pair<pit_type, ParagraphMetrics const *> lastpm = tm.last();
3601                 int const y2 = lastpm.second->position() + lastpm.second->descent();
3602
3603                 if (y2 < height_) {
3604                         Color color = buffer().isInternal()
3605                                 ? Color_background : Color_bottomarea;
3606                         pain.fillRectangle(0, y2, width_, height_ - y2, color);
3607                 }
3608                 break;
3609         }
3610         LYXERR(Debug::PAINTING, (pain.isNull() ? "\t\t --- END NODRAW ---"
3611                                 : "\t\t *** END DRAWING ***"));
3612
3613         // The scrollbar needs an update.
3614         // FIXME: does it always? see ticket #11947.
3615         updateScrollbarParameters();
3616
3617         // Normalize anchor for next time
3618         pair<pit_type, ParagraphMetrics const *> firstpm = tm.first();
3619         pair<pit_type, ParagraphMetrics const *> lastpm = tm.last();
3620         for (pit_type pit = firstpm.first; pit <= lastpm.first; ++pit) {
3621                 ParagraphMetrics const & pm = tm.parMetrics(pit);
3622                 if (pm.position() + pm.descent() > 0) {
3623                         if (d->anchor_pit_ != pit
3624                             || d->anchor_ypos_ != pm.position())
3625                                 LYXERR(Debug::PAINTING, "Found new anchor pit = " << d->anchor_pit_
3626                                        << "  anchor ypos = " << d->anchor_ypos_);
3627                         d->anchor_pit_ = pit;
3628                         d->anchor_ypos_ = pm.position();
3629                         break;
3630                 }
3631         }
3632         if (!pain.isNull()) {
3633                 // reset the update flags, everything has been done
3634                 d->update_flags_ = Update::None;
3635         }
3636
3637         // If a caret has to be painted, mark its text row as dirty to
3638         //make sure that it will be repainted on next redraw.
3639         /* FIXME: investigate whether this can be avoided when the cursor did not
3640          * move at all
3641          */
3642         if (paint_caret) {
3643                 Cursor cur(d->cursor_);
3644                 while (cur.depth() > 1) {
3645                         if (!cur.inTexted())
3646                                 break;
3647                         TextMetrics const & tm = textMetrics(cur.text());
3648                         if (d->caret_geometry_.left >= tm.origin().x_
3649                                 && d->caret_geometry_.right <= tm.origin().x_ + tm.dim().width())
3650                                 break;
3651                         cur.pop();
3652                 }
3653                 cur.textRow().changed(true);
3654         }
3655 }
3656
3657
3658 void BufferView::message(docstring const & msg)
3659 {
3660         if (d->gui_)
3661                 d->gui_->message(msg);
3662 }
3663
3664
3665 void BufferView::showDialog(string const & name)
3666 {
3667         if (d->gui_)
3668                 d->gui_->showDialog(name, string());
3669 }
3670
3671
3672 void BufferView::showDialog(string const & name,
3673         string const & data, Inset * inset)
3674 {
3675         if (d->gui_)
3676                 d->gui_->showDialog(name, data, inset);
3677 }
3678
3679
3680 void BufferView::updateDialog(string const & name, string const & data)
3681 {
3682         if (d->gui_)
3683                 d->gui_->updateDialog(name, data);
3684 }
3685
3686
3687 void BufferView::setGuiDelegate(frontend::GuiBufferViewDelegate * gui)
3688 {
3689         d->gui_ = gui;
3690 }
3691
3692
3693 // FIXME: Move this out of BufferView again
3694 docstring BufferView::contentsOfPlaintextFile(FileName const & fname)
3695 {
3696         if (!fname.isReadableFile()) {
3697                 docstring const error = from_ascii(strerror(errno));
3698                 docstring const file = makeDisplayPath(fname.absFileName(), 50);
3699                 docstring const text =
3700                   bformat(_("Could not read the specified document\n"
3701                             "%1$s\ndue to the error: %2$s"), file, error);
3702                 Alert::error(_("Could not read file"), text);
3703                 return docstring();
3704         }
3705
3706         if (!fname.isReadableFile()) {
3707                 docstring const file = makeDisplayPath(fname.absFileName(), 50);
3708                 docstring const text =
3709                   bformat(_("%1$s\n is not readable."), file);
3710                 Alert::error(_("Could not open file"), text);
3711                 return docstring();
3712         }
3713
3714         // FIXME UNICODE: We don't know the encoding of the file
3715         docstring file_content = fname.fileContents("UTF-8");
3716         if (file_content.empty()) {
3717                 Alert::error(_("Reading not UTF-8 encoded file"),
3718                              _("The file is not UTF-8 encoded.\n"
3719                                "It will be read as local 8Bit-encoded.\n"
3720                                "If this does not give the correct result\n"
3721                                "then please change the encoding of the file\n"
3722                                "to UTF-8 with a program other than LyX.\n"));
3723                 file_content = fname.fileContents("local8bit");
3724         }
3725
3726         return normalize_c(file_content);
3727 }
3728
3729
3730 void BufferView::insertPlaintextFile(FileName const & f, bool asParagraph)
3731 {
3732         docstring const tmpstr = contentsOfPlaintextFile(f);
3733
3734         if (tmpstr.empty())
3735                 return;
3736
3737         Cursor & cur = cursor();
3738         cap::replaceSelection(cur);
3739         buffer_.undo().recordUndo(cur);
3740         if (asParagraph)
3741                 cur.innerText()->insertStringAsParagraphs(cur, tmpstr, cur.current_font);
3742         else
3743                 cur.innerText()->insertStringAsLines(cur, tmpstr, cur.current_font);
3744
3745         buffer_.changed(true);
3746 }
3747
3748
3749 docstring const & BufferView::inlineCompletion() const
3750 {
3751         return d->inlineCompletion_;
3752 }
3753
3754
3755 size_t BufferView::inlineCompletionUniqueChars() const
3756 {
3757         return d->inlineCompletionUniqueChars_;
3758 }
3759
3760
3761 DocIterator const & BufferView::inlineCompletionPos() const
3762 {
3763         return d->inlineCompletionPos_;
3764 }
3765
3766
3767 void BufferView::resetInlineCompletionPos()
3768 {
3769         d->inlineCompletionPos_ = DocIterator();
3770 }
3771
3772
3773 bool samePar(DocIterator const & a, DocIterator const & b)
3774 {
3775         if (a.empty() && b.empty())
3776                 return true;
3777         if (a.empty() || b.empty())
3778                 return false;
3779         if (a.depth() != b.depth())
3780                 return false;
3781         return &a.innerParagraph() == &b.innerParagraph();
3782 }
3783
3784
3785 void BufferView::setInlineCompletion(Cursor const & cur, DocIterator const & pos,
3786         docstring const & completion, size_t uniqueChars)
3787 {
3788         uniqueChars = min(completion.size(), uniqueChars);
3789         bool changed = d->inlineCompletion_ != completion
3790                 || d->inlineCompletionUniqueChars_ != uniqueChars;
3791         bool singlePar = true;
3792         d->inlineCompletion_ = completion;
3793         d->inlineCompletionUniqueChars_ = min(completion.size(), uniqueChars);
3794
3795         //lyxerr << "setInlineCompletion pos=" << pos << " completion=" << completion << " uniqueChars=" << uniqueChars << std::endl;
3796
3797         // at new position?
3798         DocIterator const & old = d->inlineCompletionPos_;
3799         if (old != pos) {
3800                 //lyxerr << "inlineCompletionPos changed" << std::endl;
3801                 // old or pos are in another paragraph?
3802                 if ((!samePar(cur, pos) && !pos.empty())
3803                     || (!samePar(cur, old) && !old.empty())) {
3804                         singlePar = false;
3805                         //lyxerr << "different paragraph" << std::endl;
3806                 }
3807                 d->inlineCompletionPos_ = pos;
3808         }
3809
3810         // set update flags
3811         if (changed) {
3812                 if (singlePar && !(cur.result().screenUpdate() & Update::Force))
3813                         cur.screenUpdateFlags(cur.result().screenUpdate() | Update::SinglePar);
3814                 else
3815                         cur.screenUpdateFlags(cur.result().screenUpdate() | Update::Force);
3816         }
3817 }
3818
3819
3820 bool BufferView::clickableInset() const
3821 {
3822         return d->clickable_inset_;
3823 }
3824
3825 } // namespace lyx