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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 "buffer_funcs.h"
22 #include "BufferList.h"
23 #include "BufferParams.h"
24 #include "CoordCache.h"
25 #include "Cursor.h"
26 #include "CutAndPaste.h"
27 #include "DispatchResult.h"
28 #include "ErrorList.h"
29 #include "factory.h"
30 #include "FloatList.h"
31 #include "FuncRequest.h"
32 #include "FuncStatus.h"
33 #include "Intl.h"
34 #include "InsetIterator.h"
35 #include "Language.h"
36 #include "LaTeXFeatures.h"
37 #include "LyX.h"
38 #include "lyxfind.h"
39 #include "LyXFunc.h"
40 #include "Layout.h"
41 #include "LyXRC.h"
42 #include "MetricsInfo.h"
43 #include "Paragraph.h"
44 #include "paragraph_funcs.h"
45 #include "ParagraphParameters.h"
46 #include "ParIterator.h"
47 #include "Session.h"
48 #include "Text.h"
49 #include "TextClass.h"
50 #include "TextMetrics.h"
51 #include "TexRow.h"
52 #include "TocBackend.h"
53 #include "VSpace.h"
54 #include "WordLangTuple.h"
55
56 #include "insets/InsetBibtex.h"
57 #include "insets/InsetCommand.h" // ChangeRefs
58 #include "insets/InsetExternal.h"
59 #include "insets/InsetGraphics.h"
60 #include "insets/InsetRef.h"
61 #include "insets/InsetText.h"
62 #include "insets/InsetNote.h"
63
64 #include "frontends/alert.h"
65 #include "frontends/Application.h"
66 #include "frontends/Delegates.h"
67 #include "frontends/FontMetrics.h"
68 #include "frontends/Painter.h"
69 #include "frontends/Selection.h"
70
71 #include "graphics/Previews.h"
72
73 #include "support/convert.h"
74 #include "support/debug.h"
75 #include "support/ExceptionMessage.h"
76 #include "support/filetools.h"
77 #include "support/gettext.h"
78 #include "support/lstrings.h"
79 #include "support/Package.h"
80 #include "support/types.h"
81
82 #include <cerrno>
83 #include <fstream>
84 #include <functional>
85 #include <iterator>
86 #include <vector>
87
88 using namespace std;
89 using namespace lyx::support;
90
91 namespace lyx {
92
93 namespace Alert = frontend::Alert;
94
95 namespace {
96
97 /// Return an inset of this class if it exists at the current cursor position
98 template <class T>
99 T * getInsetByCode(Cursor const & cur, InsetCode code)
100 {
101         DocIterator it = cur;
102         Inset * inset = it.nextInset();
103         if (inset && inset->lyxCode() == code)
104                 return static_cast<T*>(inset);
105         return 0;
106 }
107
108
109 bool findInset(DocIterator & dit, vector<InsetCode> const & codes,
110         bool same_content);
111
112 bool findNextInset(DocIterator & dit, vector<InsetCode> const & codes,
113         docstring const & contents)
114 {
115         DocIterator tmpdit = dit;
116
117         while (tmpdit) {
118                 Inset const * inset = tmpdit.nextInset();
119                 if (inset
120                     && std::find(codes.begin(), codes.end(), inset->lyxCode()) != codes.end()
121                     && (contents.empty() ||
122                     static_cast<InsetCommand const *>(inset)->getFirstNonOptParam() == contents)) {
123                         dit = tmpdit;
124                         return true;
125                 }
126                 tmpdit.forwardInset();
127         }
128
129         return false;
130 }
131
132
133 /// Looks for next inset with one of the given codes.
134 bool findInset(DocIterator & dit, vector<InsetCode> const & codes,
135         bool same_content)
136 {
137         docstring contents;
138         DocIterator tmpdit = dit;
139         tmpdit.forwardInset();
140         if (!tmpdit)
141                 return false;
142
143         if (same_content) {
144                 Inset const * inset = tmpdit.nextInset();
145                 if (inset
146                     && std::find(codes.begin(), codes.end(), inset->lyxCode()) != codes.end()) {
147                         contents = static_cast<InsetCommand const *>(inset)->getFirstNonOptParam();
148                 }
149         }
150
151         if (!findNextInset(tmpdit, codes, contents)) {
152                 if (dit.depth() != 1 || dit.pit() != 0 || dit.pos() != 0) {
153                         tmpdit  = doc_iterator_begin(tmpdit.bottom().inset());
154                         if (!findNextInset(tmpdit, codes, contents))
155                                 return false;
156                 } else
157                         return false;
158         }
159
160         dit = tmpdit;
161         return true;
162 }
163
164
165 /// Looks for next inset with the given code
166 void findInset(DocIterator & dit, InsetCode code, bool same_content)
167 {
168         findInset(dit, vector<InsetCode>(1, code), same_content);
169 }
170
171
172 /// Moves cursor to the next inset with one of the given codes.
173 void gotoInset(BufferView * bv, vector<InsetCode> const & codes,
174                bool same_content)
175 {
176         Cursor tmpcur = bv->cursor();
177         if (!findInset(tmpcur, codes, same_content)) {
178                 bv->cursor().message(_("No more insets"));
179                 return;
180         }
181
182         tmpcur.clearSelection();
183         bv->setCursor(tmpcur);
184         bv->showCursor();
185 }
186
187
188 /// Moves cursor to the next inset with given code.
189 void gotoInset(BufferView * bv, InsetCode code, bool same_content)
190 {
191         gotoInset(bv, vector<InsetCode>(1, code), same_content);
192 }
193
194
195 /// A map from a Text to the associated text metrics
196 typedef map<Text const *, TextMetrics> TextMetricsCache;
197
198 enum ScreenUpdateStrategy {
199         NoScreenUpdate,
200         SingleParUpdate,
201         FullScreenUpdate,
202         DecorationUpdate
203 };
204
205 } // anon namespace
206
207
208 /////////////////////////////////////////////////////////////////////
209 //
210 // BufferView
211 //
212 /////////////////////////////////////////////////////////////////////
213
214 struct BufferView::Private
215 {
216         Private(BufferView & bv): wh_(0), cursor_(bv),
217                 anchor_pit_(0), anchor_ypos_(0),
218                 inlineCompletionUniqueChars_(0),
219                 last_inset_(0), gui_(0)
220         {}
221
222         ///
223         ScrollbarParameters scrollbarParameters_;
224         ///
225         ScreenUpdateStrategy update_strategy_;
226         ///
227         CoordCache coord_cache_;
228
229         /// Estimated average par height for scrollbar.
230         int wh_;
231         /// this is used to handle XSelection events in the right manner.
232         struct {
233                 CursorSlice cursor;
234                 CursorSlice anchor;
235                 bool set;
236         } xsel_cache_;
237         ///
238         Cursor cursor_;
239         ///
240         pit_type anchor_pit_;
241         ///
242         int anchor_ypos_;
243         ///
244         vector<int> par_height_;
245
246         ///
247         DocIterator inlineCompletionPos_;
248         ///
249         docstring inlineCompletion_;
250         ///
251         size_t inlineCompletionUniqueChars_;
252
253         /// keyboard mapping object.
254         Intl intl_;
255
256         /// last visited inset.
257         /** kept to send setMouseHover(false).
258           * Not owned, so don't delete.
259           */
260         Inset * last_inset_;
261
262         mutable TextMetricsCache text_metrics_;
263
264         /// Whom to notify.
265         /** Not owned, so don't delete.
266           */
267         frontend::GuiBufferViewDelegate * gui_;
268
269         /// Cache for Find Next
270         FuncRequest search_request_cache_;
271 };
272
273
274 BufferView::BufferView(Buffer & buf)
275         : width_(0), height_(0), full_screen_(false), buffer_(buf), d(new Private(*this))
276 {
277         d->xsel_cache_.set = false;
278         d->intl_.initKeyMapper(lyxrc.use_kbmap);
279
280         d->cursor_.push(buffer_.inset());
281         d->cursor_.resetAnchor();
282         d->cursor_.setCurrentFont();
283
284         if (graphics::Previews::status() != LyXRC::PREVIEW_OFF)
285                 thePreviews().generateBufferPreviews(buffer_);
286 }
287
288
289 BufferView::~BufferView()
290 {
291         // current buffer is going to be switched-off, save cursor pos
292         // Ideally, the whole cursor stack should be saved, but session
293         // currently can only handle bottom (whole document) level pit and pos.
294         // That is to say, if a cursor is in a nested inset, it will be
295         // restore to the left of the top level inset.
296         LastFilePosSection::FilePos fp;
297         fp.pit = d->cursor_.bottom().pit();
298         fp.pos = d->cursor_.bottom().pos();
299         theSession().lastFilePos().save(buffer_.fileName(), fp);
300
301         delete d;
302 }
303
304
305 int BufferView::rightMargin() const
306 {
307         // The additional test for the case the outliner is opened.
308         if (!full_screen_ ||
309                 !lyxrc.full_screen_limit ||
310                 width_ < lyxrc.full_screen_width + 20)
311                         return 10;
312
313         return (width_ - lyxrc.full_screen_width) / 2;
314 }
315
316
317 int BufferView::leftMargin() const
318 {
319         return rightMargin();
320 }
321
322
323 bool BufferView::isTopScreen() const
324 {
325         return d->scrollbarParameters_.position == d->scrollbarParameters_.min;
326 }
327
328
329 bool BufferView::isBottomScreen() const
330 {
331         return d->scrollbarParameters_.position == d->scrollbarParameters_.max;
332 }
333
334
335 Intl & BufferView::getIntl()
336 {
337         return d->intl_;
338 }
339
340
341 Intl const & BufferView::getIntl() const
342 {
343         return d->intl_;
344 }
345
346
347 CoordCache & BufferView::coordCache()
348 {
349         return d->coord_cache_;
350 }
351
352
353 CoordCache const & BufferView::coordCache() const
354 {
355         return d->coord_cache_;
356 }
357
358
359 Buffer & BufferView::buffer()
360 {
361         return buffer_;
362 }
363
364
365 Buffer const & BufferView::buffer() const
366 {
367         return buffer_;
368 }
369
370
371 bool BufferView::fitCursor()
372 {
373         if (cursorStatus(d->cursor_) == CUR_INSIDE) {
374                 frontend::FontMetrics const & fm =
375                         theFontMetrics(d->cursor_.getFont().fontInfo());
376                 int const asc = fm.maxAscent();
377                 int const des = fm.maxDescent();
378                 Point const p = getPos(d->cursor_, d->cursor_.boundary());
379                 if (p.y_ - asc >= 0 && p.y_ + des < height_)
380                         return false;
381         }
382         return true;
383 }
384
385
386 void BufferView::processUpdateFlags(Update::flags flags)
387 {
388         // last_inset_ points to the last visited inset. This pointer may become
389         // invalid because of keyboard editing. Since all such operations
390         // causes screen update(), I reset last_inset_ to avoid such a problem.
391         d->last_inset_ = 0;
392         // This is close to a hot-path.
393         LYXERR(Debug::DEBUG, "BufferView::processUpdateFlags()"
394                 << "[fitcursor = " << (flags & Update::FitCursor)
395                 << ", forceupdate = " << (flags & Update::Force)
396                 << ", singlepar = " << (flags & Update::SinglePar)
397                 << "]  buffer: " << &buffer_);
398
399         buffer_.updateMacros();
400
401         // Now do the first drawing step if needed. This consists on updating
402         // the CoordCache in updateMetrics().
403         // The second drawing step is done in WorkArea::redraw() if needed.
404
405         // Case when no explicit update is requested.
406         if (!flags) {
407                 // no need to redraw anything.
408                 d->update_strategy_ = NoScreenUpdate;
409                 return;
410         }
411
412         if (flags == Update::Decoration) {
413                 d->update_strategy_ = DecorationUpdate;
414                 buffer_.changed();
415                 return;
416         }
417
418         if (flags == Update::FitCursor
419                 || flags == (Update::Decoration | Update::FitCursor)) {
420                 // tell the frontend to update the screen if needed.
421                 if (fitCursor()) {
422                         showCursor();
423                         return;
424                 }
425                 if (flags & Update::Decoration) {
426                         d->update_strategy_ = DecorationUpdate;
427                         buffer_.changed();
428                         return;
429                 }
430                 // no screen update is needed.
431                 d->update_strategy_ = NoScreenUpdate;
432                 return;
433         }
434
435         bool const full_metrics = flags & Update::Force || !singleParUpdate();
436
437         if (full_metrics)
438                 // We have to update the full screen metrics.
439                 updateMetrics();
440
441         if (!(flags & Update::FitCursor)) {
442                 // Nothing to do anymore. Trigger a redraw and return
443                 buffer_.changed();
444                 return;
445         }
446
447         // updateMetrics() does not update paragraph position
448         // This is done at draw() time. So we need a redraw!
449         buffer_.changed();
450
451         if (fitCursor()) {
452                 // The cursor is off screen so ensure it is visible.
453                 // refresh it:
454                 showCursor();
455         }
456 }
457
458
459 void BufferView::updateScrollbar()
460 {
461         if (height_ == 0 && width_ == 0)
462                 return;
463
464         // We prefer fixed size line scrolling.
465         d->scrollbarParameters_.single_step = defaultRowHeight();
466         // We prefer full screen page scrolling.
467         d->scrollbarParameters_.page_step = height_;
468
469         Text & t = buffer_.text();
470         TextMetrics & tm = d->text_metrics_[&t];                
471
472         LYXERR(Debug::GUI, " Updating scrollbar: height: "
473                 << t.paragraphs().size()
474                 << " curr par: " << d->cursor_.bottom().pit()
475                 << " default height " << defaultRowHeight());
476
477         size_t const parsize = t.paragraphs().size();
478         if (d->par_height_.size() != parsize) {
479                 d->par_height_.clear();
480                 // FIXME: We assume a default paragraph height of 2 rows. This
481                 // should probably be pondered with the screen width.
482                 d->par_height_.resize(parsize, defaultRowHeight() * 2);
483         }
484
485         // Look at paragraph heights on-screen
486         pair<pit_type, ParagraphMetrics const *> first = tm.first();
487         pair<pit_type, ParagraphMetrics const *> last = tm.last();
488         for (pit_type pit = first.first; pit <= last.first; ++pit) {
489                 d->par_height_[pit] = tm.parMetrics(pit).height();
490                 LYXERR(Debug::SCROLLING, "storing height for pit " << pit << " : "
491                         << d->par_height_[pit]);
492         }
493
494         int top_pos = first.second->position() - first.second->ascent();
495         int bottom_pos = last.second->position() + last.second->descent();
496         bool first_visible = first.first == 0 && top_pos >= 0;
497         bool last_visible = last.first + 1 == int(parsize) && bottom_pos <= height_;
498         if (first_visible && last_visible) {
499                 d->scrollbarParameters_.min = 0;
500                 d->scrollbarParameters_.max = 0;
501                 return;
502         }
503
504         d->scrollbarParameters_.min = top_pos;
505         for (size_t i = 0; i != size_t(first.first); ++i)
506                 d->scrollbarParameters_.min -= d->par_height_[i];
507         d->scrollbarParameters_.max = bottom_pos;
508         for (size_t i = last.first + 1; i != parsize; ++i)
509                 d->scrollbarParameters_.max += d->par_height_[i];
510
511         d->scrollbarParameters_.position = 0;
512         // The reference is the top position so we remove one page.
513         d->scrollbarParameters_.max -= d->scrollbarParameters_.page_step;
514 }
515
516
517 ScrollbarParameters const & BufferView::scrollbarParameters() const
518 {
519         return d->scrollbarParameters_;
520 }
521
522
523 docstring BufferView::toolTip(int x, int y) const
524 {
525         // Get inset under mouse, if there is one.
526         Inset const * covering_inset = getCoveringInset(buffer_.text(), x, y);
527         if (!covering_inset)
528                 // No inset, no tooltip...
529                 return docstring();
530         return covering_inset->toolTip(*this, x, y);
531 }
532
533
534 docstring BufferView::contextMenu(int x, int y) const
535 {
536         //If there is a selection, return the containing inset menu
537         if (d->cursor_.selection())
538                 return d->cursor_.inset().contextMenu(*this, x, y);
539
540         // Get inset under mouse, if there is one.
541         Inset const * covering_inset = getCoveringInset(buffer_.text(), x, y);
542         if (covering_inset)
543                 return covering_inset->contextMenu(*this, x, y);
544
545         return buffer_.inset().contextMenu(*this, x, y);
546 }
547
548
549 void BufferView::scrollDocView(int value)
550 {
551         int const offset = value - d->scrollbarParameters_.position;
552
553         // No scrolling at all? No need to redraw anything
554         if (offset == 0)
555                 return;
556
557         // If the offset is less than 2 screen height, prefer to scroll instead.
558         if (abs(offset) <= 2 * height_) {
559                 d->anchor_ypos_ -= offset;
560                 updateMetrics();
561                 buffer_.changed();
562                 return;
563         }
564
565         // cut off at the top
566         if (value <= d->scrollbarParameters_.min) {
567                 DocIterator dit = doc_iterator_begin(buffer_.inset());
568                 showCursor(dit);
569                 LYXERR(Debug::SCROLLING, "scroll to top");
570                 return;
571         }
572
573         // cut off at the bottom
574         if (value >= d->scrollbarParameters_.max) {
575                 DocIterator dit = doc_iterator_end(buffer_.inset());
576                 dit.backwardPos();
577                 showCursor(dit);
578                 LYXERR(Debug::SCROLLING, "scroll to bottom");
579                 return;
580         }
581
582         // find paragraph at target position
583         int par_pos = d->scrollbarParameters_.min;
584         pit_type i = 0;
585         for (; i != int(d->par_height_.size()); ++i) {
586                 par_pos += d->par_height_[i];
587                 if (par_pos >= value)
588                         break;
589         }
590
591         if (par_pos < value) {
592                 // It seems we didn't find the correct pit so stay on the safe side and
593                 // scroll to bottom.
594                 LYXERR0("scrolling position not found!");
595                 scrollDocView(d->scrollbarParameters_.max);
596                 return;
597         }
598
599         DocIterator dit = doc_iterator_begin(buffer_.inset());
600         dit.pit() = i;
601         LYXERR(Debug::SCROLLING, "value = " << value << " -> scroll to pit " << i);
602         showCursor(dit);
603 }
604
605
606 // FIXME: this method is not working well.
607 void BufferView::setCursorFromScrollbar()
608 {
609         TextMetrics & tm = d->text_metrics_[&buffer_.text()];
610
611         int const height = 2 * defaultRowHeight();
612         int const first = height;
613         int const last = height_ - height;
614         int newy = 0;
615         Cursor const & oldcur = d->cursor_;
616
617         switch (cursorStatus(oldcur)) {
618         case CUR_ABOVE:
619                 newy = first;
620                 break;
621         case CUR_BELOW:
622                 newy = last;
623                 break;
624         case CUR_INSIDE:
625                 int const y = getPos(oldcur, oldcur.boundary()).y_;
626                 newy = min(last, max(y, first));
627                 if (y == newy) 
628                         return;
629         }
630         // We reset the cursor because cursorStatus() does not
631         // work when the cursor is within mathed.
632         Cursor cur(*this);
633         cur.reset(buffer_.inset());
634         tm.setCursorFromCoordinates(cur, 0, newy);
635
636         // update the bufferview cursor and notify insets
637         // FIXME: Care about the d->cursor_ flags to redraw if needed
638         Cursor old = d->cursor_;
639         mouseSetCursor(cur);
640         bool badcursor = notifyCursorLeavesOrEnters(old, d->cursor_);
641         if (badcursor)
642                 d->cursor_.fixIfBroken();
643 }
644
645
646 Change const BufferView::getCurrentChange() const
647 {
648         if (!d->cursor_.selection())
649                 return Change(Change::UNCHANGED);
650
651         DocIterator dit = d->cursor_.selectionBegin();
652         return dit.paragraph().lookupChange(dit.pos());
653 }
654
655
656 // this could be used elsewhere as well?
657 // FIXME: This does not work within mathed!
658 CursorStatus BufferView::cursorStatus(DocIterator const & dit) const
659 {
660         Point const p = getPos(dit, dit.boundary());
661         if (p.y_ < 0)
662                 return CUR_ABOVE;
663         if (p.y_ > workHeight())
664                 return CUR_BELOW;
665         return CUR_INSIDE;
666 }
667
668
669 void BufferView::saveBookmark(unsigned int idx)
670 {
671         // tenatively save bookmark, id and pos will be used to
672         // acturately locate a bookmark in a 'live' lyx session.
673         // pit and pos will be updated with bottom level pit/pos
674         // when lyx exits.
675         theSession().bookmarks().save(
676                 buffer_.fileName(),
677                 d->cursor_.bottom().pit(),
678                 d->cursor_.bottom().pos(),
679                 d->cursor_.paragraph().id(),
680                 d->cursor_.pos(),
681                 idx
682         );
683         if (idx)
684                 // emit message signal.
685                 message(_("Save bookmark"));
686 }
687
688
689 bool BufferView::moveToPosition(pit_type bottom_pit, pos_type bottom_pos,
690         int top_id, pos_type top_pos)
691 {
692         bool success = false;
693         DocIterator dit;
694
695         d->cursor_.clearSelection();
696
697         // if a valid par_id is given, try it first
698         // This is the case for a 'live' bookmark when unique paragraph ID
699         // is used to track bookmarks.
700         if (top_id > 0) {
701                 dit = buffer_.getParFromID(top_id);
702                 if (!dit.atEnd()) {
703                         dit.pos() = min(dit.paragraph().size(), top_pos);
704                         // Some slices of the iterator may not be
705                         // reachable (e.g. closed collapsable inset)
706                         // so the dociterator may need to be
707                         // shortened. Otherwise, setCursor may crash
708                         // lyx when the cursor can not be set to these
709                         // insets.
710                         size_t const n = dit.depth();
711                         for (size_t i = 0; i < n; ++i)
712                                 if (dit[i].inset().editable() != Inset::HIGHLY_EDITABLE) {
713                                         dit.resize(i);
714                                         break;
715                                 }
716                         success = true;
717                 }
718         }
719
720         // if top_id == 0, or searching through top_id failed
721         // This is the case for a 'restored' bookmark when only bottom
722         // (document level) pit was saved. Because of this, bookmark
723         // restoration is inaccurate. If a bookmark was within an inset,
724         // it will be restored to the left of the outmost inset that contains
725         // the bookmark.
726         if (bottom_pit < int(buffer_.paragraphs().size())) {
727                 dit = doc_iterator_begin(buffer_.inset());
728                                 
729                 dit.pit() = bottom_pit;
730                 dit.pos() = min(bottom_pos, dit.paragraph().size());
731                 success = true;
732         }
733
734         if (success) {
735                 // Note: only bottom (document) level pit is set.
736                 setCursor(dit);
737                 // set the current font.
738                 d->cursor_.setCurrentFont();
739                 // To center the screen on this new position we need the
740                 // paragraph position which is computed at draw() time.
741                 // So we need a redraw!
742                 buffer_.changed();
743                 if (fitCursor())
744                         showCursor();
745         }
746
747         return success;
748 }
749
750
751 void BufferView::translateAndInsert(char_type c, Text * t, Cursor & cur)
752 {
753         if (lyxrc.rtl_support) {
754                 if (d->cursor_.real_current_font.isRightToLeft()) {
755                         if (d->intl_.keymap == Intl::PRIMARY)
756                                 d->intl_.keyMapSec();
757                 } else {
758                         if (d->intl_.keymap == Intl::SECONDARY)
759                                 d->intl_.keyMapPrim();
760                 }
761         }
762
763         d->intl_.getTransManager().translateAndInsert(c, t, cur);
764 }
765
766
767 int BufferView::workWidth() const
768 {
769         return width_;
770 }
771
772
773 void BufferView::showCursor()
774 {
775         showCursor(d->cursor_);
776 }
777
778
779 void BufferView::showCursor(DocIterator const & dit)
780 {
781         // We are not properly started yet, delay until resizing is
782         // done.
783         if (height_ == 0)
784                 return;
785
786         LYXERR(Debug::SCROLLING, "recentering!");
787
788         CursorSlice const & bot = dit.bottom();
789         TextMetrics & tm = d->text_metrics_[bot.text()];
790
791         pos_type const max_pit = pos_type(bot.text()->paragraphs().size() - 1);
792         int bot_pit = bot.pit();
793         if (bot_pit > max_pit) {
794                 // FIXME: Why does this happen?
795                 LYXERR0("bottom pit is greater that max pit: "
796                         << bot_pit << " > " << max_pit);
797                 bot_pit = max_pit;
798         }
799
800         if (bot_pit == tm.first().first - 1)
801                 tm.newParMetricsUp();
802         else if (bot_pit == tm.last().first + 1)
803                 tm.newParMetricsDown();
804
805         if (tm.contains(bot_pit)) {
806                 ParagraphMetrics const & pm = tm.parMetrics(bot_pit);
807                 LASSERT(!pm.rows().empty(), /**/);
808                 // FIXME: smooth scrolling doesn't work in mathed.
809                 CursorSlice const & cs = dit.innerTextSlice();
810                 int offset = coordOffset(dit, dit.boundary()).y_;
811                 int ypos = pm.position() + offset;
812                 Dimension const & row_dim =
813                         pm.getRow(cs.pos(), dit.boundary()).dimension();
814                 int scrolled = 0;
815                 if (ypos - row_dim.ascent() < 0)
816                         scrolled = scrollUp(- ypos + row_dim.ascent());
817                 else if (ypos + row_dim.descent() > height_)
818                         scrolled = scrollDown(ypos - height_ + row_dim.descent());
819                 // else, nothing to do, the cursor is already visible so we just return.
820                 if (scrolled != 0) {
821                         updateMetrics();
822                         buffer_.changed();
823                 }
824                 return;
825         }
826
827         // fix inline completion position
828         if (d->inlineCompletionPos_.fixIfBroken())
829                 d->inlineCompletionPos_ = DocIterator();
830
831         tm.redoParagraph(bot_pit);
832         ParagraphMetrics const & pm = tm.parMetrics(bot_pit);
833         int offset = coordOffset(dit, dit.boundary()).y_;
834
835         d->anchor_pit_ = bot_pit;
836         CursorSlice const & cs = dit.innerTextSlice();
837         Dimension const & row_dim =
838                 pm.getRow(cs.pos(), dit.boundary()).dimension();
839
840         if (d->anchor_pit_ == 0)
841                 d->anchor_ypos_ = offset + pm.ascent();
842         else if (d->anchor_pit_ == max_pit)
843                 d->anchor_ypos_ = height_ - offset - row_dim.descent();
844         else
845                 d->anchor_ypos_ = defaultRowHeight() * 2 - offset - row_dim.descent();
846
847         updateMetrics();
848         buffer_.changed();
849 }
850
851
852 FuncStatus BufferView::getStatus(FuncRequest const & cmd)
853 {
854         FuncStatus flag;
855
856         Cursor & cur = d->cursor_;
857
858         switch (cmd.action) {
859
860         case LFUN_UNDO:
861                 flag.setEnabled(buffer_.undo().hasUndoStack());
862                 break;
863         case LFUN_REDO:
864                 flag.setEnabled(buffer_.undo().hasRedoStack());
865                 break;
866         case LFUN_FILE_INSERT:
867         case LFUN_FILE_INSERT_PLAINTEXT_PARA:
868         case LFUN_FILE_INSERT_PLAINTEXT:
869         case LFUN_BOOKMARK_SAVE:
870                 // FIXME: Actually, these LFUNS should be moved to Text
871                 flag.setEnabled(cur.inTexted());
872                 break;
873         case LFUN_FONT_STATE:
874         case LFUN_LABEL_INSERT:
875         case LFUN_INFO_INSERT:
876         case LFUN_INSET_EDIT:
877         case LFUN_PARAGRAPH_GOTO:
878         case LFUN_NOTE_NEXT:
879         case LFUN_REFERENCE_NEXT:
880         case LFUN_WORD_FIND:
881         case LFUN_WORD_FINDADV:
882         case LFUN_WORD_REPLACE:
883         case LFUN_MARK_OFF:
884         case LFUN_MARK_ON:
885         case LFUN_MARK_TOGGLE:
886         case LFUN_SCREEN_RECENTER:
887         case LFUN_BIBTEX_DATABASE_ADD:
888         case LFUN_BIBTEX_DATABASE_DEL:
889         case LFUN_NOTES_MUTATE:
890         case LFUN_ALL_INSETS_TOGGLE:
891         case LFUN_STATISTICS:
892                 flag.setEnabled(true);
893                 break;
894
895         // @todo Test if current WorkArea is the search WorkArea
896         case LFUN_REGEXP_MODE:
897                 flag.setEnabled(! this->cursor().inRegexped());
898                 break;
899
900         case LFUN_COPY_LABEL_AS_REF:
901                 // if there is an inset at cursor, see whether it
902                 // handles the lfun, other start from scratch
903                 Inset * inset = cur.nextInset();
904                 if (!inset || !inset->getStatus(cur, cmd, flag))
905                         flag = lyx::getStatus(cmd);
906                 break;
907
908         case LFUN_NEXT_INSET_TOGGLE: 
909         case LFUN_NEXT_INSET_MODIFY: {
910                 // this is the real function we want to invoke
911                 FuncRequest tmpcmd = cmd;
912                 tmpcmd.action = (cmd.action == LFUN_NEXT_INSET_TOGGLE) 
913                         ? LFUN_INSET_TOGGLE : LFUN_INSET_MODIFY;
914                 // if there is an inset at cursor, see whether it
915                 // handles the lfun, other start from scratch
916                 Inset * inset = cur.nextInset();
917                 if (!inset || !inset->getStatus(cur, tmpcmd, flag))
918                         flag = lyx::getStatus(tmpcmd);
919                 break;
920         }
921
922         case LFUN_LABEL_GOTO: {
923                 flag.setEnabled(!cmd.argument().empty()
924                     || getInsetByCode<InsetRef>(cur, REF_CODE));
925                 break;
926         }
927
928         case LFUN_CHANGES_TRACK:
929                 flag.setEnabled(true);
930                 flag.setOnOff(buffer_.params().trackChanges);
931                 break;
932
933         case LFUN_CHANGES_OUTPUT:
934                 flag.setEnabled(true);
935                 flag.setOnOff(buffer_.params().outputChanges);
936                 break;
937
938         case LFUN_CHANGES_MERGE:
939         case LFUN_CHANGE_NEXT:
940         case LFUN_ALL_CHANGES_ACCEPT:
941         case LFUN_ALL_CHANGES_REJECT:
942                 // TODO: context-sensitive enabling of LFUNs
943                 // In principle, these command should only be enabled if there
944                 // is a change in the document. However, without proper
945                 // optimizations, this will inevitably result in poor performance.
946                 flag.setEnabled(true);
947                 break;
948
949         case LFUN_BUFFER_TOGGLE_COMPRESSION: {
950                 flag.setOnOff(buffer_.params().compressed);
951                 break;
952         }
953         
954         case LFUN_SCREEN_UP:
955         case LFUN_SCREEN_DOWN:
956         case LFUN_SCROLL:
957         case LFUN_SCREEN_UP_SELECT:
958         case LFUN_SCREEN_DOWN_SELECT:
959                 flag.setEnabled(true);
960                 break;
961
962         case LFUN_LAYOUT_TABULAR:
963                 flag.setEnabled(cur.innerInsetOfType(TABULAR_CODE));
964                 break;
965
966         case LFUN_LAYOUT:
967                 flag.setEnabled(!cur.inset().forcePlainLayout(cur.idx()));
968                 break;
969
970         case LFUN_LAYOUT_PARAGRAPH:
971                 flag.setEnabled(cur.inset().allowParagraphCustomization(cur.idx()));
972                 break;
973
974         case LFUN_INSET_SETTINGS: {
975                 InsetCode code = cur.inset().lyxCode();
976                 if (cmd.getArg(0) == insetName(code)) {
977                         flag.setEnabled(true);
978                         break;
979                 }
980                 bool enable = false;
981                 InsetCode next_code = cur.nextInset()
982                         ? cur.nextInset()->lyxCode() : NO_CODE;
983                 //FIXME: remove these special cases:
984                 switch (next_code) {
985                         case TABULAR_CODE:
986                         case ERT_CODE:
987                         case FLOAT_CODE:
988                         case WRAP_CODE:
989                         case NOTE_CODE:
990                         case BRANCH_CODE:
991                         case BOX_CODE:
992                         case LISTINGS_CODE:
993                                 enable = (cmd.argument().empty() ||
994                                           cmd.getArg(0) == insetName(next_code));
995                                 break;
996                         default:
997                                 break;
998                 }
999                 flag.setEnabled(enable);
1000                 break;
1001         }
1002
1003         case LFUN_DIALOG_SHOW_NEW_INSET:
1004                 flag.setEnabled(cur.inset().lyxCode() != ERT_CODE &&
1005                         cur.inset().lyxCode() != LISTINGS_CODE);
1006                 if (cur.inset().lyxCode() == CAPTION_CODE) {
1007                         FuncStatus flag;
1008                         if (cur.inset().getStatus(cur, cmd, flag))
1009                                 return flag;
1010                 }
1011                 break;
1012
1013         case LFUN_BRANCH_ACTIVATE: 
1014         case LFUN_BRANCH_DEACTIVATE: {
1015                 bool enable = false;
1016                 docstring const branchName = cmd.argument();
1017                 if (!branchName.empty())
1018                         enable = buffer_.params().branchlist().find(branchName);
1019                 flag.setEnabled(enable);
1020                 break;
1021         }
1022
1023         default:
1024                 flag.setEnabled(false);
1025         }
1026
1027         return flag;
1028 }
1029
1030
1031 bool BufferView::dispatch(FuncRequest const & cmd)
1032 {
1033         //lyxerr << [ cmd = " << cmd << "]" << endl;
1034
1035         // Make sure that the cached BufferView is correct.
1036         LYXERR(Debug::ACTION, " action[" << cmd.action << ']'
1037                 << " arg[" << to_utf8(cmd.argument()) << ']'
1038                 << " x[" << cmd.x << ']'
1039                 << " y[" << cmd.y << ']'
1040                 << " button[" << cmd.button() << ']');
1041
1042         Cursor & cur = d->cursor_;
1043
1044         switch (cmd.action) {
1045
1046         case LFUN_UNDO:
1047                 cur.message(_("Undo"));
1048                 cur.clearSelection();
1049                 if (!cur.textUndo())
1050                         cur.message(_("No further undo information"));
1051                 else
1052                         processUpdateFlags(Update::Force | Update::FitCursor);
1053                 break;
1054
1055         case LFUN_REDO:
1056                 cur.message(_("Redo"));
1057                 cur.clearSelection();
1058                 if (!cur.textRedo())
1059                         cur.message(_("No further redo information"));
1060                 else
1061                         processUpdateFlags(Update::Force | Update::FitCursor);
1062                 break;
1063
1064         case LFUN_FONT_STATE:
1065                 cur.message(cur.currentState());
1066                 break;
1067
1068         case LFUN_BOOKMARK_SAVE:
1069                 saveBookmark(convert<unsigned int>(to_utf8(cmd.argument())));
1070                 break;
1071
1072         case LFUN_LABEL_GOTO: {
1073                 docstring label = cmd.argument();
1074                 if (label.empty()) {
1075                         InsetRef * inset =
1076                                 getInsetByCode<InsetRef>(d->cursor_,
1077                                                          REF_CODE);
1078                         if (inset) {
1079                                 label = inset->getParam("reference");
1080                                 // persistent=false: use temp_bookmark
1081                                 saveBookmark(0);
1082                         }
1083                 }
1084
1085                 if (!label.empty())
1086                         gotoLabel(label);
1087                 break;
1088         }
1089         
1090         case LFUN_INSET_EDIT: {
1091                 FuncRequest fr(cmd);
1092                 // if there is an inset at cursor, see whether it
1093                 // can be modified.
1094                 Inset * inset = cur.nextInset();
1095                 if (inset)
1096                         inset->dispatch(cur, fr);
1097                 // if it did not work, try the underlying inset.
1098                 if (!inset || !cur.result().dispatched())
1099                         cur.dispatch(cmd);
1100
1101                 // FIXME I'm adding the last break to solve a crash,
1102                 // but that is obviously not right.
1103                 if (!cur.result().dispatched())
1104                         // It did not work too; no action needed.
1105                         break;
1106                 break;
1107         }
1108
1109         case LFUN_PARAGRAPH_GOTO: {
1110                 int const id = convert<int>(cmd.getArg(0));
1111                 int const pos = convert<int>(cmd.getArg(1));
1112                 int i = 0;
1113                 for (Buffer * b = &buffer_; i == 0 || b != &buffer_;
1114                         b = theBufferList().next(b)) {
1115
1116                         DocIterator dit = b->getParFromID(id);
1117                         if (dit.atEnd()) {
1118                                 LYXERR(Debug::INFO, "No matching paragraph found! [" << id << "].");
1119                                 ++i;
1120                                 continue;
1121                         }
1122                         LYXERR(Debug::INFO, "Paragraph " << dit.paragraph().id()
1123                                 << " found in buffer `"
1124                                 << b->absFileName() << "'.");
1125
1126                         if (b == &buffer_) {
1127                                 // Set the cursor
1128                                 dit.pos() = pos;
1129                                 setCursor(dit);
1130                                 processUpdateFlags(Update::Force | Update::FitCursor);
1131                         } else {
1132                                 // Switch to other buffer view and resend cmd
1133                                 theLyXFunc().dispatch(FuncRequest(
1134                                         LFUN_BUFFER_SWITCH, b->absFileName()));
1135                                 theLyXFunc().dispatch(cmd);
1136                         }
1137                         break;
1138                 }
1139                 break;
1140         }
1141
1142         case LFUN_NOTE_NEXT:
1143                 gotoInset(this, NOTE_CODE, false);
1144                 break;
1145
1146         case LFUN_REFERENCE_NEXT: {
1147                 vector<InsetCode> tmp;
1148                 tmp.push_back(LABEL_CODE);
1149                 tmp.push_back(REF_CODE);
1150                 gotoInset(this, tmp, true);
1151                 break;
1152         }
1153
1154         case LFUN_CHANGES_TRACK:
1155                 buffer_.params().trackChanges = !buffer_.params().trackChanges;
1156                 break;
1157
1158         case LFUN_CHANGES_OUTPUT:
1159                 buffer_.params().outputChanges = !buffer_.params().outputChanges;
1160                 if (buffer_.params().outputChanges) {
1161                         bool dvipost    = LaTeXFeatures::isAvailable("dvipost");
1162                         bool xcolorsoul = LaTeXFeatures::isAvailable("soul") &&
1163                                           LaTeXFeatures::isAvailable("xcolor");
1164
1165                         if (!dvipost && !xcolorsoul) {
1166                                 Alert::warning(_("Changes not shown in LaTeX output"),
1167                                                _("Changes will not be highlighted in LaTeX output, "
1168                                                  "because neither dvipost nor xcolor/soul are installed.\n"
1169                                                  "Please install these packages or redefine "
1170                                                  "\\lyxadded and \\lyxdeleted in the LaTeX preamble."));
1171                         } else if (!xcolorsoul) {
1172                                 Alert::warning(_("Changes not shown in LaTeX output"),
1173                                                _("Changes will not be highlighted in LaTeX output "
1174                                                  "when using pdflatex, because xcolor and soul are not installed.\n"
1175                                                  "Please install both packages or redefine "
1176                                                  "\\lyxadded and \\lyxdeleted in the LaTeX preamble."));
1177                         }
1178                 }
1179                 break;
1180
1181         case LFUN_CHANGE_NEXT:
1182                 findNextChange(this);
1183                 // FIXME: Move this LFUN to Buffer so that we don't have to do this:
1184                 processUpdateFlags(Update::Force | Update::FitCursor);
1185                 break;
1186
1187         case LFUN_CHANGES_MERGE:
1188                 if (findNextChange(this)) {
1189                         processUpdateFlags(Update::Force | Update::FitCursor);
1190                         showDialog("changes");
1191                 }
1192                 break;
1193
1194         case LFUN_ALL_CHANGES_ACCEPT:
1195                 // select complete document
1196                 d->cursor_.reset(buffer_.inset());
1197                 d->cursor_.selHandle(true);
1198                 buffer_.text().cursorBottom(d->cursor_);
1199                 // accept everything in a single step to support atomic undo
1200                 buffer_.text().acceptOrRejectChanges(d->cursor_, Text::ACCEPT);
1201                 // FIXME: Move this LFUN to Buffer so that we don't have to do this:
1202                 processUpdateFlags(Update::Force | Update::FitCursor);
1203                 break;
1204
1205         case LFUN_ALL_CHANGES_REJECT:
1206                 // select complete document
1207                 d->cursor_.reset(buffer_.inset());
1208                 d->cursor_.selHandle(true);
1209                 buffer_.text().cursorBottom(d->cursor_);
1210                 // reject everything in a single step to support atomic undo
1211                 // Note: reject does not work recursively; the user may have to repeat the operation
1212                 buffer_.text().acceptOrRejectChanges(d->cursor_, Text::REJECT);
1213                 // FIXME: Move this LFUN to Buffer so that we don't have to do this:
1214                 processUpdateFlags(Update::Force | Update::FitCursor);
1215                 break;
1216
1217         case LFUN_WORD_FIND: {
1218                 FuncRequest req = cmd;
1219                 if (cmd.argument().empty() && !d->search_request_cache_.argument().empty())
1220                         req = d->search_request_cache_;
1221                 if (req.argument().empty()) {
1222                         theLyXFunc().dispatch(FuncRequest(LFUN_DIALOG_SHOW, "findreplace"));
1223                         break;
1224                 }
1225                 if (find(this, req))
1226                         showCursor();
1227                 else
1228                         message(_("String not found!"));
1229                 d->search_request_cache_ = req;
1230                 break;
1231         }
1232
1233         case LFUN_WORD_REPLACE: {
1234                 bool has_deleted = false;
1235                 if (cur.selection()) {
1236                         DocIterator beg = cur.selectionBegin();
1237                         DocIterator end = cur.selectionEnd();
1238                         if (beg.pit() == end.pit()) {
1239                                 for (pos_type p = beg.pos() ; p < end.pos() ; ++p) {
1240                                         if (cur.paragraph().isDeleted(p))
1241                                                 has_deleted = true;
1242                                 }
1243                         }
1244                 }
1245                 replace(this, cmd, has_deleted);
1246                 break;
1247         }
1248
1249         case LFUN_WORD_FINDADV:
1250                 findAdv(this, cmd);
1251                 break;
1252
1253         case LFUN_MARK_OFF:
1254                 cur.clearSelection();
1255                 cur.resetAnchor();
1256                 cur.message(from_utf8(N_("Mark off")));
1257                 break;
1258
1259         case LFUN_MARK_ON:
1260                 cur.clearSelection();
1261                 cur.setMark(true);
1262                 cur.resetAnchor();
1263                 cur.message(from_utf8(N_("Mark on")));
1264                 break;
1265
1266         case LFUN_MARK_TOGGLE:
1267                 cur.clearSelection();
1268                 if (cur.mark()) {
1269                         cur.setMark(false);
1270                         cur.message(from_utf8(N_("Mark removed")));
1271                 } else {
1272                         cur.setMark(true);
1273                         cur.message(from_utf8(N_("Mark set")));
1274                 }
1275                 cur.resetAnchor();
1276                 break;
1277
1278         case LFUN_SCREEN_RECENTER:
1279                 showCursor();
1280                 break;
1281
1282         case LFUN_BIBTEX_DATABASE_ADD: {
1283                 Cursor tmpcur = d->cursor_;
1284                 findInset(tmpcur, BIBTEX_CODE, false);
1285                 InsetBibtex * inset = getInsetByCode<InsetBibtex>(tmpcur,
1286                                                 BIBTEX_CODE);
1287                 if (inset) {
1288                         if (inset->addDatabase(cmd.argument()))
1289                                 buffer_.updateBibfilesCache();
1290                 }
1291                 break;
1292         }
1293
1294         case LFUN_BIBTEX_DATABASE_DEL: {
1295                 Cursor tmpcur = d->cursor_;
1296                 findInset(tmpcur, BIBTEX_CODE, false);
1297                 InsetBibtex * inset = getInsetByCode<InsetBibtex>(tmpcur,
1298                                                 BIBTEX_CODE);
1299                 if (inset) {
1300                         if (inset->delDatabase(cmd.argument()))
1301                                 buffer_.updateBibfilesCache();
1302                 }
1303                 break;
1304         }
1305
1306         case LFUN_STATISTICS: {
1307                 DocIterator from, to;
1308                 if (cur.selection()) {
1309                         from = cur.selectionBegin();
1310                         to = cur.selectionEnd();
1311                 } else {
1312                         from = doc_iterator_begin(buffer_.inset());
1313                         to = doc_iterator_end(buffer_.inset());
1314                 }
1315                 int const words = countWords(from, to);
1316                 int const chars = countChars(from, to, false);
1317                 int const chars_blanks = countChars(from, to, true);
1318                 docstring message;
1319                 if (cur.selection())
1320                         message = _("Statistics for the selection:");
1321                 else
1322                         message = _("Statistics for the document:");
1323                 message += "\n\n";
1324                 if (words != 1)
1325                         message += bformat(_("%1$d words"), words);
1326                 else
1327                         message += _("One word");
1328                 message += "\n";
1329                 if (chars_blanks != 1)
1330                         message += bformat(_("%1$d characters (including blanks)"),
1331                                           chars_blanks);
1332                 else
1333                         message += _("One character (including blanks)");
1334                 message += "\n";
1335                 if (chars != 1)
1336                         message += bformat(_("%1$d characters (excluding blanks)"),
1337                                           chars);
1338                 else
1339                         message += _("One character (excluding blanks)");
1340
1341                 Alert::information(_("Statistics"), message);
1342         }
1343                 break;
1344
1345         case LFUN_BUFFER_TOGGLE_COMPRESSION:
1346                 // turn compression on/off
1347                 buffer_.params().compressed = !buffer_.params().compressed;
1348                 break;
1349         case LFUN_COPY_LABEL_AS_REF: {
1350                 // if there is an inset at cursor, try to copy it
1351                 Inset * inset = cur.nextInset();
1352                 if (inset) {
1353                         FuncRequest tmpcmd = cmd;
1354                         inset->dispatch(cur, tmpcmd);
1355                 }
1356                 if (!cur.result().dispatched())
1357                         // It did not work too; no action needed.
1358                         break;
1359                 cur.clearSelection();
1360                 processUpdateFlags(Update::SinglePar | Update::FitCursor);
1361                 break;
1362         }
1363         case LFUN_NEXT_INSET_TOGGLE: {
1364                 // create the the real function we want to invoke
1365                 FuncRequest tmpcmd = cmd;
1366                 tmpcmd.action = LFUN_INSET_TOGGLE;
1367                 // if there is an inset at cursor, see whether it
1368                 // wants to toggle.
1369                 Inset * inset = cur.nextInset();
1370                 if (inset) {
1371                         if (inset->isActive()) {
1372                                 Cursor tmpcur = cur;
1373                                 tmpcur.pushBackward(*inset);
1374                                 inset->dispatch(tmpcur, tmpcmd);
1375                                 if (tmpcur.result().dispatched())
1376                                         cur.dispatched();
1377                         } else 
1378                                 inset->dispatch(cur, tmpcmd);
1379                 }
1380                 // if it did not work, try the underlying inset.
1381                 if (!inset || !cur.result().dispatched())
1382                         cur.dispatch(tmpcmd);
1383
1384                 if (!cur.result().dispatched())
1385                         // It did not work too; no action needed.
1386                         break;
1387                 cur.clearSelection();
1388                 processUpdateFlags(Update::SinglePar | Update::FitCursor);
1389                 break;
1390         }
1391
1392         case LFUN_NEXT_INSET_MODIFY: {
1393                 // create the the real function we want to invoke
1394                 FuncRequest tmpcmd = cmd;
1395                 tmpcmd.action = LFUN_INSET_MODIFY;
1396                 // if there is an inset at cursor, see whether it
1397                 // can be modified.
1398                 Inset * inset = cur.nextInset();
1399                 if (inset)
1400                         inset->dispatch(cur, tmpcmd);
1401                 // if it did not work, try the underlying inset.
1402                 if (!inset || !cur.result().dispatched())
1403                         cur.dispatch(tmpcmd);
1404
1405                 if (!cur.result().dispatched())
1406                         // It did not work too; no action needed.
1407                         break;
1408                 cur.clearSelection();
1409                 processUpdateFlags(Update::Force | Update::FitCursor);
1410                 break;
1411         }
1412
1413         case LFUN_SCREEN_UP:
1414         case LFUN_SCREEN_DOWN: {
1415                 Point p = getPos(cur, cur.boundary());
1416                 if (p.y_ < 0 || p.y_ > height_) {
1417                         // The cursor is off-screen so recenter before proceeding.
1418                         showCursor();
1419                         p = getPos(cur, cur.boundary());
1420                 }
1421                 int const scrolled = scroll(cmd.action == LFUN_SCREEN_UP
1422                         ? - height_ : height_);
1423                 if (cmd.action == LFUN_SCREEN_UP && scrolled > - height_)
1424                         p = Point(0, 0);
1425                 if (cmd.action == LFUN_SCREEN_DOWN && scrolled < height_)
1426                         p = Point(width_, height_);
1427                 cur.reset(buffer_.inset());
1428                 updateMetrics();
1429                 buffer_.changed();
1430                 d->text_metrics_[&buffer_.text()].editXY(cur, p.x_, p.y_);
1431                 //FIXME: what to do with cur.x_target()?
1432                 cur.finishUndo();
1433                 break;
1434         }
1435
1436         case LFUN_SCROLL:
1437                 lfunScroll(cmd);
1438                 break;
1439
1440         case LFUN_SCREEN_UP_SELECT: {
1441                 cur.selHandle(true);
1442                 if (isTopScreen()) {
1443                         lyx::dispatch(FuncRequest(LFUN_BUFFER_BEGIN_SELECT));
1444                         cur.finishUndo();
1445                         break;
1446                 }
1447                 int y = getPos(cur, cur.boundary()).y_;
1448                 int const ymin = y - height_ + defaultRowHeight();
1449                 while (y > ymin && cur.up())
1450                         y = getPos(cur, cur.boundary()).y_;
1451
1452                 cur.finishUndo();
1453                 processUpdateFlags(Update::SinglePar | Update::FitCursor);
1454                 break;
1455         }
1456
1457         case LFUN_SCREEN_DOWN_SELECT: {
1458                 cur.selHandle(true);
1459                 if (isBottomScreen()) {
1460                         lyx::dispatch(FuncRequest(LFUN_BUFFER_END_SELECT));
1461                         cur.finishUndo();
1462                         break;
1463                 }
1464                 int y = getPos(cur, cur.boundary()).y_;
1465                 int const ymax = y + height_ - defaultRowHeight();
1466                 while (y < ymax && cur.down())
1467                         y = getPos(cur, cur.boundary()).y_;
1468
1469                 cur.finishUndo();
1470                 processUpdateFlags(Update::SinglePar | Update::FitCursor);
1471                 break;
1472         }
1473
1474         case LFUN_BRANCH_ACTIVATE:
1475         case LFUN_BRANCH_DEACTIVATE:
1476                 buffer_.dispatch(cmd);
1477                 processUpdateFlags(Update::Force);
1478                 break;
1479
1480         // This could be rewriten using some command like forall <insetname> <command>
1481         // once the insets refactoring is done.
1482         case LFUN_NOTES_MUTATE: {
1483                 if (cmd.argument().empty())
1484                         break;
1485
1486                 if (mutateNotes(cur, cmd.getArg(0), cmd.getArg(1))) {
1487                         processUpdateFlags(Update::Force);
1488                 }
1489                 break;
1490         }
1491
1492         case LFUN_ALL_INSETS_TOGGLE: {
1493                 string action;
1494                 string const name = split(to_utf8(cmd.argument()), action, ' ');
1495                 InsetCode const inset_code = insetCode(name);
1496
1497                 FuncRequest fr(LFUN_INSET_TOGGLE, action);
1498
1499                 Inset & inset = cur.buffer().inset();
1500                 InsetIterator it  = inset_iterator_begin(inset);
1501                 InsetIterator const end = inset_iterator_end(inset);
1502                 for (; it != end; ++it) {
1503                         if (it->asInsetCollapsable()
1504                             && (inset_code == NO_CODE
1505                             || inset_code == it->lyxCode())) {
1506                                 Cursor tmpcur = cur;
1507                                 tmpcur.pushBackward(*it);
1508                                 it->dispatch(tmpcur, fr);
1509                         }
1510                 }
1511                 processUpdateFlags(Update::Force | Update::FitCursor);
1512                 break;
1513         }
1514
1515         default:
1516                 return false;
1517         }
1518
1519         return true;
1520 }
1521
1522
1523 docstring const BufferView::requestSelection()
1524 {
1525         Cursor & cur = d->cursor_;
1526
1527         LYXERR(Debug::SELECTION, "requestSelection: cur.selection: " << cur.selection());
1528         if (!cur.selection()) {
1529                 d->xsel_cache_.set = false;
1530                 return docstring();
1531         }
1532
1533         LYXERR(Debug::SELECTION, "requestSelection: xsel_cache.set: " << d->xsel_cache_.set);
1534         if (!d->xsel_cache_.set ||
1535             cur.top() != d->xsel_cache_.cursor ||
1536             cur.anchor_.top() != d->xsel_cache_.anchor)
1537         {
1538                 d->xsel_cache_.cursor = cur.top();
1539                 d->xsel_cache_.anchor = cur.anchor_.top();
1540                 d->xsel_cache_.set = cur.selection();
1541                 return cur.selectionAsString(false);
1542         }
1543         return docstring();
1544 }
1545
1546
1547 void BufferView::clearSelection()
1548 {
1549         d->cursor_.clearSelection();
1550         // Clear the selection buffer. Otherwise a subsequent
1551         // middle-mouse-button paste would use the selection buffer,
1552         // not the more current external selection.
1553         cap::clearSelection();
1554         d->xsel_cache_.set = false;
1555         // The buffer did not really change, but this causes the
1556         // redraw we need because we cleared the selection above.
1557         buffer_.changed();
1558 }
1559
1560
1561 void BufferView::resize(int width, int height)
1562 {
1563         // Update from work area
1564         width_ = width;
1565         height_ = height;
1566
1567         // Clear the paragraph height cache.
1568         d->par_height_.clear();
1569         // Redo the metrics.
1570         updateMetrics();
1571 }
1572
1573
1574 Inset const * BufferView::getCoveringInset(Text const & text,
1575                 int x, int y) const
1576 {
1577         TextMetrics & tm = d->text_metrics_[&text];
1578         Inset * inset = tm.checkInsetHit(x, y);
1579         if (!inset)
1580                 return 0;
1581
1582         if (!inset->descendable())
1583                 // No need to go further down if the inset is not
1584                 // descendable.
1585                 return inset;
1586
1587         size_t cell_number = inset->nargs();
1588         // Check all the inner cell.
1589         for (size_t i = 0; i != cell_number; ++i) {
1590                 Text const * inner_text = inset->getText(i);
1591                 if (inner_text) {
1592                         // Try deeper.
1593                         Inset const * inset_deeper =
1594                                 getCoveringInset(*inner_text, x, y);
1595                         if (inset_deeper)
1596                                 return inset_deeper;
1597                 }
1598         }
1599
1600         return inset;
1601 }
1602
1603
1604 void BufferView::mouseEventDispatch(FuncRequest const & cmd0)
1605 {
1606         //lyxerr << "[ cmd0 " << cmd0 << "]" << endl;
1607
1608         // This is only called for mouse related events including
1609         // LFUN_FILE_OPEN generated by drag-and-drop.
1610         FuncRequest cmd = cmd0;
1611
1612         Cursor old = cursor();
1613         Cursor cur(*this);
1614         cur.push(buffer_.inset());
1615         cur.setSelection(d->cursor_.selection());
1616
1617         // Either the inset under the cursor or the
1618         // surrounding Text will handle this event.
1619
1620         // make sure we stay within the screen...
1621         cmd.y = min(max(cmd.y, -1), height_);
1622
1623         if (cmd.action == LFUN_MOUSE_MOTION && cmd.button() == mouse_button::none) {
1624
1625                 // Get inset under mouse, if there is one.
1626                 Inset const * covering_inset =
1627                         getCoveringInset(buffer_.text(), cmd.x, cmd.y);
1628                 if (covering_inset == d->last_inset_)
1629                         // Same inset, no need to do anything...
1630                         return;
1631
1632                 bool need_redraw = false;
1633                 // const_cast because of setMouseHover().
1634                 Inset * inset = const_cast<Inset *>(covering_inset);
1635                 if (d->last_inset_)
1636                         // Remove the hint on the last hovered inset (if any).
1637                         need_redraw |= d->last_inset_->setMouseHover(false);
1638                 if (inset)
1639                         // Highlighted the newly hovered inset (if any).
1640                         need_redraw |= inset->setMouseHover(true);
1641                 d->last_inset_ = inset;
1642                 if (!need_redraw)
1643                         return;
1644
1645                 LYXERR(Debug::PAINTING, "Mouse hover detected at: ("
1646                         << cmd.x << ", " << cmd.y << ")");
1647
1648                 d->update_strategy_ = DecorationUpdate;
1649
1650                 // This event (moving without mouse click) is not passed further.
1651                 // This should be changed if it is further utilized.
1652                 buffer_.changed();
1653                 return;
1654         }
1655
1656         // Build temporary cursor.
1657         Inset * inset = d->text_metrics_[&buffer_.text()].editXY(cur, cmd.x, cmd.y);
1658
1659         // Put anchor at the same position.
1660         cur.resetAnchor();
1661
1662         cur.beginUndoGroup();
1663
1664         // Try to dispatch to an non-editable inset near this position
1665         // via the temp cursor. If the inset wishes to change the real
1666         // cursor it has to do so explicitly by using
1667         //  cur.bv().cursor() = cur;  (or similar)
1668         if (inset)
1669                 inset->dispatch(cur, cmd);
1670
1671         // Now dispatch to the temporary cursor. If the real cursor should
1672         // be modified, the inset's dispatch has to do so explicitly.
1673         if (!inset || !cur.result().dispatched())
1674                 cur.dispatch(cmd);
1675
1676         cur.endUndoGroup();
1677
1678         // Notify left insets
1679         if (cur != old) {
1680                 old.fixIfBroken();
1681                 bool badcursor = notifyCursorLeavesOrEnters(old, cur);
1682                 if (badcursor)
1683                         cursor().fixIfBroken();
1684         }
1685         
1686         // Do we have a selection?
1687         theSelection().haveSelection(cursor().selection());
1688
1689         // If the command has been dispatched,
1690         if (cur.result().dispatched() || cur.result().update())
1691                 processUpdateFlags(cur.result().update());
1692 }
1693
1694
1695 void BufferView::lfunScroll(FuncRequest const & cmd)
1696 {
1697         string const scroll_type = cmd.getArg(0);
1698         int const scroll_step = 
1699                 (scroll_type == "line") ? d->scrollbarParameters_.single_step
1700                 : (scroll_type == "page") ? d->scrollbarParameters_.page_step : 0;
1701         if (scroll_step == 0)
1702                 return;
1703         string const scroll_quantity = cmd.getArg(1);
1704         if (scroll_quantity == "up")
1705                 scrollUp(scroll_step);
1706         else if (scroll_quantity == "down")
1707                 scrollDown(scroll_step);
1708         else {
1709                 int const scroll_value = convert<int>(scroll_quantity);
1710                 if (scroll_value)
1711                         scroll(scroll_step * scroll_value);
1712         }
1713         updateMetrics();
1714         buffer_.changed();
1715 }
1716
1717
1718 int BufferView::scroll(int y)
1719 {
1720         if (y > 0)
1721                 return scrollDown(y);
1722         if (y < 0)
1723                 return scrollUp(-y);
1724         return 0;
1725 }
1726
1727
1728 int BufferView::scrollDown(int offset)
1729 {
1730         Text * text = &buffer_.text();
1731         TextMetrics & tm = d->text_metrics_[text];
1732         int ymax = height_ + offset;
1733         while (true) {
1734                 pair<pit_type, ParagraphMetrics const *> last = tm.last();
1735                 int bottom_pos = last.second->position() + last.second->descent();
1736                 if (last.first + 1 == int(text->paragraphs().size())) {
1737                         if (bottom_pos <= height_)
1738                                 return 0;
1739                         offset = min(offset, bottom_pos - height_);
1740                         break;
1741                 }
1742                 if (bottom_pos > ymax)
1743                         break;
1744                 tm.newParMetricsDown();
1745         }
1746         d->anchor_ypos_ -= offset;
1747         return -offset;
1748 }
1749
1750
1751 int BufferView::scrollUp(int offset)
1752 {
1753         Text * text = &buffer_.text();
1754         TextMetrics & tm = d->text_metrics_[text];
1755         int ymin = - offset;
1756         while (true) {
1757                 pair<pit_type, ParagraphMetrics const *> first = tm.first();
1758                 int top_pos = first.second->position() - first.second->ascent();
1759                 if (first.first == 0) {
1760                         if (top_pos >= 0)
1761                                 return 0;
1762                         offset = min(offset, - top_pos);
1763                         break;
1764                 }
1765                 if (top_pos < ymin)
1766                         break;
1767                 tm.newParMetricsUp();
1768         }
1769         d->anchor_ypos_ += offset;
1770         return offset;
1771 }
1772
1773
1774 void BufferView::setCursorFromRow(int row)
1775 {
1776         int tmpid = -1;
1777         int tmppos = -1;
1778
1779         buffer_.texrow().getIdFromRow(row, tmpid, tmppos);
1780
1781         d->cursor_.reset(buffer_.inset());
1782         if (tmpid == -1)
1783                 buffer_.text().setCursor(d->cursor_, 0, 0);
1784         else
1785                 buffer_.text().setCursor(d->cursor_, buffer_.getParFromID(tmpid).pit(), tmppos);
1786 }
1787
1788
1789 bool BufferView::setCursorFromInset(Inset const * inset)
1790 {
1791         // are we already there?
1792         if (cursor().nextInset() == inset)
1793                 return true;
1794
1795         // Inset is not at cursor position. Find it in the document.
1796         Cursor cur(*this);
1797         cur.reset(buffer().inset());
1798         while (cur && cur.nextInset() != inset)
1799                 cur.forwardInset();
1800
1801         if (cur) {
1802                 setCursor(cur);
1803                 return true;
1804         }
1805         return false;
1806 }
1807
1808
1809 void BufferView::gotoLabel(docstring const & label)
1810 {
1811         Toc & toc = buffer().tocBackend().toc("label");
1812         TocIterator toc_it = toc.begin();
1813         TocIterator end = toc.end();
1814         for (; toc_it != end; ++toc_it) {
1815                 if (label == toc_it->str())
1816                         dispatch(toc_it->action());
1817         }
1818         //FIXME: We could do a bit more searching thanks to this:
1819         //InsetLabel const * inset = buffer_.insetLabel(label);
1820 }
1821
1822
1823 TextMetrics const & BufferView::textMetrics(Text const * t) const
1824 {
1825         return const_cast<BufferView *>(this)->textMetrics(t);
1826 }
1827
1828
1829 TextMetrics & BufferView::textMetrics(Text const * t)
1830 {
1831         TextMetricsCache::iterator tmc_it  = d->text_metrics_.find(t);
1832         if (tmc_it == d->text_metrics_.end()) {
1833                 tmc_it = d->text_metrics_.insert(
1834                         make_pair(t, TextMetrics(this, const_cast<Text *>(t)))).first;
1835         }
1836         return tmc_it->second;
1837 }
1838
1839
1840 ParagraphMetrics const & BufferView::parMetrics(Text const * t,
1841                 pit_type pit) const
1842 {
1843         return textMetrics(t).parMetrics(pit);
1844 }
1845
1846
1847 int BufferView::workHeight() const
1848 {
1849         return height_;
1850 }
1851
1852
1853 void BufferView::setCursor(DocIterator const & dit)
1854 {
1855         size_t const n = dit.depth();
1856         for (size_t i = 0; i < n; ++i)
1857                 dit[i].inset().edit(d->cursor_, true);
1858
1859         d->cursor_.setCursor(dit);
1860         d->cursor_.setSelection(false);
1861 }
1862
1863
1864 bool BufferView::checkDepm(Cursor & cur, Cursor & old)
1865 {
1866         // Would be wrong to delete anything if we have a selection.
1867         if (cur.selection())
1868                 return false;
1869
1870         bool need_anchor_change = false;
1871         bool changed = d->cursor_.text()->deleteEmptyParagraphMechanism(cur, old,
1872                 need_anchor_change);
1873
1874         if (need_anchor_change)
1875                 cur.resetAnchor();
1876
1877         if (!changed)
1878                 return false;
1879
1880         d->cursor_ = cur;
1881
1882         buffer_.updateLabels();
1883
1884         updateMetrics();
1885         buffer_.changed();
1886         return true;
1887 }
1888
1889
1890 bool BufferView::mouseSetCursor(Cursor & cur, bool select)
1891 {
1892         LASSERT(&cur.bv() == this, /**/);
1893
1894         if (!select)
1895                 // this event will clear selection so we save selection for
1896                 // persistent selection
1897                 cap::saveSelection(cursor());
1898
1899         // Has the cursor just left the inset?
1900         bool leftinset = (&d->cursor_.inset() != &cur.inset());
1901         if (leftinset)
1902                 d->cursor_.fixIfBroken();
1903
1904         // FIXME: shift-mouse selection doesn't work well across insets.
1905         bool do_selection = select && &d->cursor_.anchor().inset() == &cur.inset();
1906
1907         // do the dEPM magic if needed
1908         // FIXME: (1) move this to InsetText::notifyCursorLeaves?
1909         // FIXME: (2) if we had a working InsetText::notifyCursorLeaves,
1910         // the leftinset bool would not be necessary (badcursor instead).
1911         bool update = leftinset;
1912         if (!do_selection && d->cursor_.inTexted())
1913                 update |= checkDepm(cur, d->cursor_);
1914
1915         d->cursor_.setCursor(cur);
1916         d->cursor_.boundary(cur.boundary());
1917         if (do_selection)
1918                 d->cursor_.setSelection();
1919         else
1920                 d->cursor_.clearSelection();
1921
1922         d->cursor_.finishUndo();
1923         d->cursor_.setCurrentFont();
1924         return update;
1925 }
1926
1927
1928 void BufferView::putSelectionAt(DocIterator const & cur,
1929                                 int length, bool backwards)
1930 {
1931         d->cursor_.clearSelection();
1932
1933         setCursor(cur);
1934
1935         if (length) {
1936                 if (backwards) {
1937                         d->cursor_.pos() += length;
1938                         d->cursor_.setSelection(d->cursor_, -length);
1939                 } else
1940                         d->cursor_.setSelection(d->cursor_, length);
1941         }
1942         // Ensure a redraw happens in any case because the new selection could 
1943         // possibly be on the same screen as the previous selection.
1944         processUpdateFlags(Update::Force | Update::FitCursor);
1945 }
1946
1947
1948 Cursor & BufferView::cursor()
1949 {
1950         return d->cursor_;
1951 }
1952
1953
1954 Cursor const & BufferView::cursor() const
1955 {
1956         return d->cursor_;
1957 }
1958
1959
1960 pit_type BufferView::anchor_ref() const
1961 {
1962         return d->anchor_pit_;
1963 }
1964
1965
1966 bool BufferView::singleParUpdate()
1967 {
1968         Text & buftext = buffer_.text();
1969         pit_type const bottom_pit = d->cursor_.bottom().pit();
1970         TextMetrics & tm = textMetrics(&buftext);
1971         int old_height = tm.parMetrics(bottom_pit).height();
1972
1973         // make sure inline completion pointer is ok
1974         if (d->inlineCompletionPos_.fixIfBroken())
1975                 d->inlineCompletionPos_ = DocIterator();
1976
1977         // In Single Paragraph mode, rebreak only
1978         // the (main text, not inset!) paragraph containing the cursor.
1979         // (if this paragraph contains insets etc., rebreaking will
1980         // recursively descend)
1981         tm.redoParagraph(bottom_pit);
1982         ParagraphMetrics const & pm = tm.parMetrics(bottom_pit);                
1983         if (pm.height() != old_height)
1984                 // Paragraph height has changed so we cannot proceed to
1985                 // the singlePar optimisation.
1986                 return false;
1987
1988         d->update_strategy_ = SingleParUpdate;
1989
1990         LYXERR(Debug::PAINTING, "\ny1: " << pm.position() - pm.ascent()
1991                 << " y2: " << pm.position() + pm.descent()
1992                 << " pit: " << bottom_pit
1993                 << " singlepar: 1");
1994         return true;
1995 }
1996
1997
1998 void BufferView::updateMetrics()
1999 {
2000         if (height_ == 0 || width_ == 0)
2001                 return;
2002
2003         Text & buftext = buffer_.text();
2004         pit_type const npit = int(buftext.paragraphs().size());
2005
2006         // Clear out the position cache in case of full screen redraw,
2007         d->coord_cache_.clear();
2008
2009         // Clear out paragraph metrics to avoid having invalid metrics
2010         // in the cache from paragraphs not relayouted below
2011         // The complete text metrics will be redone.
2012         d->text_metrics_.clear();
2013
2014         TextMetrics & tm = textMetrics(&buftext);
2015
2016         // make sure inline completion pointer is ok
2017         if (d->inlineCompletionPos_.fixIfBroken())
2018                 d->inlineCompletionPos_ = DocIterator();
2019         
2020         if (d->anchor_pit_ >= npit)
2021                 // The anchor pit must have been deleted...
2022                 d->anchor_pit_ = npit - 1;
2023
2024         // Rebreak anchor paragraph.
2025         tm.redoParagraph(d->anchor_pit_);
2026         ParagraphMetrics & anchor_pm = tm.par_metrics_[d->anchor_pit_];
2027         
2028         // position anchor
2029         if (d->anchor_pit_ == 0) {
2030                 int scrollRange = d->scrollbarParameters_.max - d->scrollbarParameters_.min;
2031                 
2032                 // Complete buffer visible? Then it's easy.
2033                 if (scrollRange == 0)
2034                         d->anchor_ypos_ = anchor_pm.ascent();
2035         
2036                 // FIXME: Some clever handling needed to show
2037                 // the _first_ paragraph up to the top if the cursor is
2038                 // in the first line.
2039         }               
2040         anchor_pm.setPosition(d->anchor_ypos_);
2041
2042         LYXERR(Debug::PAINTING, "metrics: "
2043                 << " anchor pit = " << d->anchor_pit_
2044                 << " anchor ypos = " << d->anchor_ypos_);
2045
2046         // Redo paragraphs above anchor if necessary.
2047         int y1 = d->anchor_ypos_ - anchor_pm.ascent();
2048         // We are now just above the anchor paragraph.
2049         pit_type pit1 = d->anchor_pit_ - 1;
2050         for (; pit1 >= 0 && y1 >= 0; --pit1) {
2051                 tm.redoParagraph(pit1);
2052                 ParagraphMetrics & pm = tm.par_metrics_[pit1];
2053                 y1 -= pm.descent();
2054                 // Save the paragraph position in the cache.
2055                 pm.setPosition(y1);
2056                 y1 -= pm.ascent();
2057         }
2058
2059         // Redo paragraphs below the anchor if necessary.
2060         int y2 = d->anchor_ypos_ + anchor_pm.descent();
2061         // We are now just below the anchor paragraph.
2062         pit_type pit2 = d->anchor_pit_ + 1;
2063         for (; pit2 < npit && y2 <= height_; ++pit2) {
2064                 tm.redoParagraph(pit2);
2065                 ParagraphMetrics & pm = tm.par_metrics_[pit2];
2066                 y2 += pm.ascent();
2067                 // Save the paragraph position in the cache.
2068                 pm.setPosition(y2);
2069                 y2 += pm.descent();
2070         }
2071
2072         LYXERR(Debug::PAINTING, "Metrics: "
2073                 << " anchor pit = " << d->anchor_pit_
2074                 << " anchor ypos = " << d->anchor_ypos_
2075                 << " y1 = " << y1
2076                 << " y2 = " << y2
2077                 << " pit1 = " << pit1
2078                 << " pit2 = " << pit2);
2079
2080         d->update_strategy_ = FullScreenUpdate;
2081
2082         if (lyxerr.debugging(Debug::WORKAREA)) {
2083                 LYXERR(Debug::WORKAREA, "BufferView::updateMetrics");
2084                 d->coord_cache_.dump();
2085         }
2086 }
2087
2088
2089 void BufferView::insertLyXFile(FileName const & fname)
2090 {
2091         LASSERT(d->cursor_.inTexted(), /**/);
2092
2093         // Get absolute path of file and add ".lyx"
2094         // to the filename if necessary
2095         FileName filename = fileSearch(string(), fname.absFilename(), "lyx");
2096
2097         docstring const disp_fn = makeDisplayPath(filename.absFilename());
2098         // emit message signal.
2099         message(bformat(_("Inserting document %1$s..."), disp_fn));
2100
2101         docstring res;
2102         Buffer buf("", false);
2103         if (buf.loadLyXFile(filename)) {
2104                 ErrorList & el = buffer_.errorList("Parse");
2105                 // Copy the inserted document error list into the current buffer one.
2106                 el = buf.errorList("Parse");
2107                 buffer_.undo().recordUndo(d->cursor_);
2108                 cap::pasteParagraphList(d->cursor_, buf.paragraphs(),
2109                                              buf.params().documentClassPtr(), el);
2110                 res = _("Document %1$s inserted.");
2111         } else {
2112                 res = _("Could not insert document %1$s");
2113         }
2114
2115         updateMetrics();
2116         buffer_.changed();
2117         // emit message signal.
2118         message(bformat(res, disp_fn));
2119         buffer_.errors("Parse");
2120 }
2121
2122
2123 Point BufferView::coordOffset(DocIterator const & dit, bool boundary) const
2124 {
2125         int x = 0;
2126         int y = 0;
2127         int lastw = 0;
2128
2129         // Addup contribution of nested insets, from inside to outside,
2130         // keeping the outer paragraph for a special handling below
2131         for (size_t i = dit.depth() - 1; i >= 1; --i) {
2132                 CursorSlice const & sl = dit[i];
2133                 int xx = 0;
2134                 int yy = 0;
2135                 
2136                 // get relative position inside sl.inset()
2137                 sl.inset().cursorPos(*this, sl, boundary && (i + 1 == dit.depth()), xx, yy);
2138                 
2139                 // Make relative position inside of the edited inset relative to sl.inset()
2140                 x += xx;
2141                 y += yy;
2142                 
2143                 // In case of an RTL inset, the edited inset will be positioned to the left
2144                 // of xx:yy
2145                 if (sl.text()) {
2146                         bool boundary_i = boundary && i + 1 == dit.depth();
2147                         bool rtl = textMetrics(sl.text()).isRTL(sl, boundary_i);
2148                         if (rtl)
2149                                 x -= lastw;
2150                 }
2151
2152                 // remember width for the case that sl.inset() is positioned in an RTL inset
2153                 if (i && dit[i - 1].text()) {
2154                         // If this Inset is inside a Text Inset, retrieve the Dimension
2155                         // from the containing text instead of using Inset::dimension() which
2156                         // might not be implemented.
2157                         // FIXME (Abdel 23/09/2007): this is a bit messy because of the
2158                         // elimination of Inset::dim_ cache. This coordOffset() method needs
2159                         // to be rewritten in light of the new design.
2160                         Dimension const & dim = parMetrics(dit[i - 1].text(),
2161                                 dit[i - 1].pit()).insetDimension(&sl.inset());
2162                         lastw = dim.wid;
2163                 } else {
2164                         Dimension const dim = sl.inset().dimension(*this);
2165                         lastw = dim.wid;
2166                 }
2167                 
2168                 //lyxerr << "Cursor::getPos, i: "
2169                 // << i << " x: " << xx << " y: " << y << endl;
2170         }
2171
2172         // Add contribution of initial rows of outermost paragraph
2173         CursorSlice const & sl = dit[0];
2174         TextMetrics const & tm = textMetrics(sl.text());
2175         ParagraphMetrics const & pm = tm.parMetrics(sl.pit());
2176         LASSERT(!pm.rows().empty(), /**/);
2177         y -= pm.rows()[0].ascent();
2178 #if 1
2179         // FIXME: document this mess
2180         size_t rend;
2181         if (sl.pos() > 0 && dit.depth() == 1) {
2182                 int pos = sl.pos();
2183                 if (pos && boundary)
2184                         --pos;
2185 //              lyxerr << "coordOffset: boundary:" << boundary << " depth:" << dit.depth() << " pos:" << pos << " sl.pos:" << sl.pos() << endl;
2186                 rend = pm.pos2row(pos);
2187         } else
2188                 rend = pm.pos2row(sl.pos());
2189 #else
2190         size_t rend = pm.pos2row(sl.pos());
2191 #endif
2192         for (size_t rit = 0; rit != rend; ++rit)
2193                 y += pm.rows()[rit].height();
2194         y += pm.rows()[rend].ascent();
2195         
2196         TextMetrics const & bottom_tm = textMetrics(dit.bottom().text());
2197         
2198         // Make relative position from the nested inset now bufferview absolute.
2199         int xx = bottom_tm.cursorX(dit.bottom(), boundary && dit.depth() == 1);
2200         x += xx;
2201         
2202         // In the RTL case place the nested inset at the left of the cursor in 
2203         // the outer paragraph
2204         bool boundary_1 = boundary && 1 == dit.depth();
2205         bool rtl = bottom_tm.isRTL(dit.bottom(), boundary_1);
2206         if (rtl)
2207                 x -= lastw;
2208         
2209         return Point(x, y);
2210 }
2211
2212
2213 Point BufferView::getPos(DocIterator const & dit, bool boundary) const
2214 {
2215         CursorSlice const & bot = dit.bottom();
2216         TextMetrics const & tm = textMetrics(bot.text());
2217         if (!tm.contains(bot.pit()))
2218                 return Point(-1, -1);
2219
2220         Point p = coordOffset(dit, boundary); // offset from outer paragraph
2221         p.y_ += tm.parMetrics(bot.pit()).position();
2222         return p;
2223 }
2224
2225
2226 void BufferView::draw(frontend::Painter & pain)
2227 {
2228         if (height_ == 0 || width_ == 0)
2229                 return;
2230         LYXERR(Debug::PAINTING, "\t\t*** START DRAWING ***");
2231
2232         Text & text = buffer_.text();
2233         TextMetrics const & tm = d->text_metrics_[&text];
2234         int const y = tm.first().second->position();
2235         PainterInfo pi(this, pain);
2236
2237         switch (d->update_strategy_) {
2238
2239         case NoScreenUpdate:
2240                 // If no screen painting is actually needed, only some the different
2241                 // coordinates of insets and paragraphs needs to be updated.
2242                 pi.full_repaint = true;
2243                 pi.pain.setDrawingEnabled(false);
2244                 tm.draw(pi, 0, y);
2245                 break;
2246
2247         case SingleParUpdate:
2248                 pi.full_repaint = false;
2249                 // In general, only the current row of the outermost paragraph
2250                 // will be redrawn. Particular cases where selection spans
2251                 // multiple paragraph are correctly detected in TextMetrics.
2252                 tm.draw(pi, 0, y);
2253                 break;
2254
2255         case DecorationUpdate:
2256                 // FIXME: We should also distinguish DecorationUpdate to avoid text
2257                 // drawing if possible. This is not possible to do easily right now
2258                 // because of the single backing pixmap.
2259
2260         case FullScreenUpdate:
2261                 // The whole screen, including insets, will be refreshed.
2262                 pi.full_repaint = true;
2263
2264                 // Clear background.
2265                 pain.fillRectangle(0, 0, width_, height_,
2266                         pi.backgroundColor(&buffer_.inset()));
2267
2268                 // Draw everything.
2269                 tm.draw(pi, 0, y);
2270
2271                 // and possibly grey out below
2272                 pair<pit_type, ParagraphMetrics const *> lastpm = tm.last();
2273                 int const y2 = lastpm.second->position() + lastpm.second->descent();
2274                 if (y2 < height_)
2275                         pain.fillRectangle(0, y2, width_, height_ - y2, Color_bottomarea);
2276                 break;
2277         }
2278         LYXERR(Debug::PAINTING, "\n\t\t*** END DRAWING  ***");
2279
2280         // The scrollbar needs an update.
2281         updateScrollbar();
2282
2283         // Normalize anchor for next time
2284         pair<pit_type, ParagraphMetrics const *> firstpm = tm.first();
2285         pair<pit_type, ParagraphMetrics const *> lastpm = tm.last();
2286         for (pit_type pit = firstpm.first; pit <= lastpm.first; ++pit) {
2287                 ParagraphMetrics const & pm = tm.parMetrics(pit);
2288                 if (pm.position() + pm.descent() > 0) {
2289                         d->anchor_pit_ = pit;
2290                         d->anchor_ypos_ = pm.position();
2291                         break;
2292                 }
2293         }
2294         LYXERR(Debug::PAINTING, "Found new anchor pit = " << d->anchor_pit_
2295                 << "  anchor ypos = " << d->anchor_ypos_);
2296 }
2297
2298
2299 void BufferView::message(docstring const & msg)
2300 {
2301         if (d->gui_)
2302                 d->gui_->message(msg);
2303 }
2304
2305
2306 void BufferView::showDialog(string const & name)
2307 {
2308         if (d->gui_)
2309                 d->gui_->showDialog(name, string());
2310 }
2311
2312
2313 void BufferView::showDialog(string const & name,
2314         string const & data, Inset * inset)
2315 {
2316         if (d->gui_)
2317                 d->gui_->showDialog(name, data, inset);
2318 }
2319
2320
2321 void BufferView::updateDialog(string const & name, string const & data)
2322 {
2323         if (d->gui_)
2324                 d->gui_->updateDialog(name, data);
2325 }
2326
2327
2328 void BufferView::setGuiDelegate(frontend::GuiBufferViewDelegate * gui)
2329 {
2330         d->gui_ = gui;
2331 }
2332
2333
2334 // FIXME: Move this out of BufferView again
2335 docstring BufferView::contentsOfPlaintextFile(FileName const & fname)
2336 {
2337         if (!fname.isReadableFile()) {
2338                 docstring const error = from_ascii(strerror(errno));
2339                 docstring const file = makeDisplayPath(fname.absFilename(), 50);
2340                 docstring const text =
2341                   bformat(_("Could not read the specified document\n"
2342                             "%1$s\ndue to the error: %2$s"), file, error);
2343                 Alert::error(_("Could not read file"), text);
2344                 return docstring();
2345         }
2346
2347         if (!fname.isReadableFile()) {
2348                 docstring const file = makeDisplayPath(fname.absFilename(), 50);
2349                 docstring const text =
2350                   bformat(_("%1$s\n is not readable."), file);
2351                 Alert::error(_("Could not open file"), text);
2352                 return docstring();
2353         }
2354
2355         // FIXME UNICODE: We don't know the encoding of the file
2356         docstring file_content = fname.fileContents("UTF-8");
2357         if (file_content.empty()) {
2358                 Alert::error(_("Reading not UTF-8 encoded file"),
2359                              _("The file is not UTF-8 encoded.\n"
2360                                "It will be read as local 8Bit-encoded.\n"
2361                                "If this does not give the correct result\n"
2362                                "then please change the encoding of the file\n"
2363                                "to UTF-8 with a program other than LyX.\n"));
2364                 file_content = fname.fileContents("local8bit");
2365         }
2366
2367         return normalize_c(file_content);
2368 }
2369
2370
2371 void BufferView::insertPlaintextFile(FileName const & f, bool asParagraph)
2372 {
2373         docstring const tmpstr = contentsOfPlaintextFile(f);
2374
2375         if (tmpstr.empty())
2376                 return;
2377
2378         Cursor & cur = cursor();
2379         cap::replaceSelection(cur);
2380         buffer_.undo().recordUndo(cur);
2381         if (asParagraph)
2382                 cur.innerText()->insertStringAsParagraphs(cur, tmpstr);
2383         else
2384                 cur.innerText()->insertStringAsLines(cur, tmpstr);
2385
2386         updateMetrics();
2387         buffer_.changed();
2388 }
2389
2390
2391 docstring const & BufferView::inlineCompletion() const
2392 {
2393         return d->inlineCompletion_;
2394 }
2395
2396
2397 size_t const & BufferView::inlineCompletionUniqueChars() const
2398 {
2399         return d->inlineCompletionUniqueChars_;
2400 }
2401
2402
2403 DocIterator const & BufferView::inlineCompletionPos() const
2404 {
2405         return d->inlineCompletionPos_;
2406 }
2407
2408
2409 bool samePar(DocIterator const & a, DocIterator const & b)
2410 {
2411         if (a.empty() && b.empty())
2412                 return true;
2413         if (a.empty() || b.empty())
2414                 return false;
2415         return &a.innerParagraph() == &b.innerParagraph();
2416 }
2417
2418
2419 void BufferView::setInlineCompletion(Cursor & cur, DocIterator const & pos, 
2420         docstring const & completion, size_t uniqueChars)
2421 {
2422         uniqueChars = min(completion.size(), uniqueChars);
2423         bool changed = d->inlineCompletion_ != completion
2424                 || d->inlineCompletionUniqueChars_ != uniqueChars;
2425         bool singlePar = true;
2426         d->inlineCompletion_ = completion;
2427         d->inlineCompletionUniqueChars_ = min(completion.size(), uniqueChars);
2428         
2429         //lyxerr << "setInlineCompletion pos=" << pos << " completion=" << completion << " uniqueChars=" << uniqueChars << std::endl;
2430         
2431         // at new position?
2432         DocIterator const & old = d->inlineCompletionPos_;
2433         if (old != pos) {
2434                 //lyxerr << "inlineCompletionPos changed" << std::endl;
2435                 // old or pos are in another paragraph?
2436                 if ((!samePar(cur, pos) && !pos.empty())
2437                     || (!samePar(cur, old) && !old.empty())) {
2438                         singlePar = false;
2439                         //lyxerr << "different paragraph" << std::endl;
2440                 }
2441                 d->inlineCompletionPos_ = pos;
2442         }
2443         
2444         // set update flags
2445         if (changed) {
2446                 if (singlePar && !(cur.disp_.update() & Update::Force))
2447                         cur.updateFlags(cur.disp_.update() | Update::SinglePar);
2448                 else
2449                         cur.updateFlags(cur.disp_.update() | Update::Force);
2450         }
2451 }
2452
2453 } // namespace lyx