src/frontends/qt4/GuiCompleter.cpp

   1 /**
   2  * \file GuiCompleter.cpp
   3  * This file is part of LyX, the document processor.
   4  * Licence details can be found in the file COPYING.
   5  *
   6  * \author Stefan Schimanski
   7  *
   8  * Full author contact details are available in file CREDITS.
   9  */
  10
  11 #include <config.h>
  12
  13 #include "GuiWorkArea.h"
  14
  15 #include "Buffer.h"
  16 #include "BufferView.h"
  17 #include "Cursor.h"
  18 #include "Dimension.h"
  19 #include "FuncRequest.h"
  20 #include "GuiView.h"
  21 #include "LyXFunc.h"
  22 #include "LyXRC.h"
  23 #include "Paragraph.h"
  24 #include "version.h"
  25
  26 #include "support/debug.h"
  27
  28 #include <QApplication>
  29 #include <QAbstractListModel>
  30 #include <QHeaderView>
  31 #include <QPainter>
  32 #include <QPixmapCache>
  33 #include <QScrollBar>
  34 #include <QItemDelegate>
  35 #include <QTreeView>
  36 #include <QTimer>
  37
  38 using namespace std;
  39 using namespace lyx::support;
  40
  41 namespace lyx {
  42 namespace frontend {
  43
  44 class RtlItemDelegate : public QItemDelegate {
  45 public:
  46         explicit RtlItemDelegate(QObject * parent = 0)
  47                 : QItemDelegate(parent) {}
  48
  49 protected:
  50         virtual void drawDisplay(QPainter * painter,
  51                 QStyleOptionViewItem const & option,
  52                 QRect const & rect, QString const & text) const
  53         {
  54                 // FIXME: do this more elegantly
  55                 docstring stltext = qstring_to_ucs4(text);
  56                 reverse(stltext.begin(), stltext.end());
  57                 QItemDelegate::drawDisplay(painter, option, rect, toqstr(stltext));
  58         }
  59 };
  60
  61
  62 class PixmapItemDelegate : public QItemDelegate {
  63 public:
  64         explicit PixmapItemDelegate(QObject *parent = 0)
  65         : QItemDelegate(parent) {}
  66
  67 protected:
  68         void paint(QPainter *painter, const QStyleOptionViewItem &option,
  69                    const QModelIndex &index) const
  70         {
  71                 QStyleOptionViewItem opt = setOptions(index, option);
  72                 QVariant value = index.data(Qt::DisplayRole);
  73                 QPixmap pixmap = qvariant_cast<QPixmap>(value);
  74
  75                 // draw
  76                 painter->save();
  77                 drawBackground(painter, opt, index);
  78                 if (!pixmap.isNull()) {
  79                         const QSize size = pixmap.size();
  80                         painter->drawPixmap(option.rect.left() + (16 - size.width()) / 2,
  81                                 option.rect.top() + (option.rect.height() - size.height()) / 2,
  82                                 pixmap);
  83                 }
  84                 drawFocus(painter, opt, option.rect);
  85                 painter->restore();
  86         }
  87 };
  88
  89
  90 class GuiCompletionModel : public QAbstractListModel {
  91 public:
  92         ///
  93         GuiCompletionModel(QObject * parent,
  94                 Inset::CompletionList const * l)
  95                 : QAbstractListModel(parent), list_(l) {}
  96         ///
  97         ~GuiCompletionModel()
  98                 { delete list_; }
  99         ///
 100         bool sorted() const
 101         {
 102                 if (list_)
 103                         return list_->sorted();
 104                 else
 105                         return false;
 106         }
 107         ///
 108         int columnCount(const QModelIndex & /*parent*/ = QModelIndex()) const
 109         {
 110                 return 2;
 111         }
 112         ///
 113         int rowCount(const QModelIndex & /*parent*/ = QModelIndex()) const
 114         {
 115                 if (list_ == 0)
 116                         return 0;
 117                 else
 118                         return list_->size();
 119         }
 120
 121         ///
 122         QVariant data(const QModelIndex & index, int role) const
 123         {
 124                 if (list_ == 0)
 125                         return QVariant();
 126
 127                 if (index.row() < 0 || index.row() >= rowCount())
 128                         return QVariant();
 129
 130                 if (role != Qt::DisplayRole && role != Qt::EditRole)
 131                     return QVariant();
 132
 133                 if (index.column() == 0) {
 134                         docstring const word = list_->data(index.row());
 135                         return toqstr(word);
 136                 } else if (index.column() == 1) {
 137                         // get icon from cache
 138                         QPixmap scaled;
 139                         QString const name = ":" + toqstr(list_->icon(index.row()));
 140                         if (!QPixmapCache::find("completion" + name, scaled)) {
 141                                 // load icon from disk
 142                                 QPixmap p = QPixmap(name);
 143                                 if (!p.isNull()) {
 144                                         // scale it to 16x16 or smaller
 145                                         scaled = p.scaled(min(16, p.width()), min(16, p.height()),
 146                                                 Qt::KeepAspectRatio, Qt::SmoothTransformation);
 147                                 }
 148
 149                                 QPixmapCache::insert("completion" + name, scaled);
 150                         }
 151                         return scaled;
 152                 }
 153                 return QVariant();
 154         }
 155
 156 private:
 157         ///
 158         Inset::CompletionList const * list_;
 159 };
 160
 161
 162 GuiCompleter::GuiCompleter(GuiWorkArea * gui, QObject * parent)
 163         : QCompleter(parent), gui_(gui), updateLock_(0),
 164           inlineVisible_(false)
 165 {
 166         // Setup the completion popup
 167         setModel(new GuiCompletionModel(this, 0));
 168         setCompletionMode(QCompleter::PopupCompletion);
 169         setWidget(gui_);
 170
 171         // create the popup
 172         QTreeView *listView = new QTreeView;
 173         listView->setEditTriggers(QAbstractItemView::NoEditTriggers);
 174         listView->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 175         listView->setSelectionBehavior(QAbstractItemView::SelectRows);
 176         listView->setSelectionMode(QAbstractItemView::SingleSelection);
 177         listView->header()->hide();
 178         listView->setIndentation(0);
 179         listView->setUniformRowHeights(true);
 180         setPopup(listView);
 181         popup()->setItemDelegateForColumn(1, new PixmapItemDelegate(this));
 182         rtlItemDelegate_ = new RtlItemDelegate(this);
 183
 184         // create timeout timers
 185         popup_timer_.setSingleShot(true);
 186         inline_timer_.setSingleShot(true);
 187         connect(this, SIGNAL(highlighted(const QString &)),
 188                 this, SLOT(popupHighlighted(const QString &)));
 189         connect(this, SIGNAL(activated(const QString &)),
 190                 this, SLOT(popupActivated(const QString &)));
 191         connect(&popup_timer_, SIGNAL(timeout()),
 192                 this, SLOT(showPopup()));
 193         connect(&inline_timer_, SIGNAL(timeout()),
 194                 this, SLOT(showInline()));
 195 }
 196
 197
 198 GuiCompleter::~GuiCompleter()
 199 {
 200         popup()->hide();
 201 }
 202
 203
 204 bool GuiCompleter::eventFilter(QObject * watched, QEvent * e)
 205 {
 206         // hijack back the tab key from the popup
 207         // (which stole it from the workspace before)
 208         if (e->type() == QEvent::KeyPress && popupVisible()) {
 209                 QKeyEvent *ke = static_cast<QKeyEvent *>(e);
 210                 switch (ke->key()) {
 211                 case Qt::Key_Tab:
 212                         tab();
 213                         ke->accept();
 214                         return true;
 215                 default: break;
 216                 }
 217         }
 218
 219         return QCompleter::eventFilter(watched, e);
 220 }
 221
 222
 223 bool GuiCompleter::popupPossible(Cursor const & cur) const
 224 {
 225         return QApplication::activeWindow()
 226                 && gui_->hasFocus()
 227                 && cur.inset().completionSupported(cur);
 228 }
 229
 230
 231 bool GuiCompleter::inlinePossible(Cursor const & cur) const
 232 {
 233         return cur.inset().inlineCompletionSupported(cur);
 234 }
 235
 236
 237 bool GuiCompleter::completionAvailable() const
 238 {
 239         return popup()->model()->rowCount() > 0;
 240 }
 241
 242
 243 bool GuiCompleter::popupVisible() const
 244 {
 245         return popup()->isVisible();
 246 }
 247
 248
 249 bool GuiCompleter::inlineVisible() const
 250 {
 251         // In fact using BufferView::inlineCompletionPos.empty() should be
 252         // here. But unfortunately this information is not good enough
 253         // because destructive operations like backspace might invalidate
 254         // inlineCompletionPos. But then the completion should stay visible
 255         // (i.e. reshown on the next update). Hence be keep this information
 256         // in the inlineVisible_ variable.
 257         return inlineVisible_;
 258 }
 259
 260
 261 void GuiCompleter::updateVisibility(Cursor & cur, bool start, bool keep, bool cursorInView)
 262 {
 263         // parameters which affect the completion
 264         bool moved = cur != old_cursor_;
 265         if (moved)
 266                 old_cursor_ = cur;
 267
 268         bool possiblePopupState = popupPossible(cur) && cursorInView;
 269         bool possibleInlineState = inlinePossible(cur) && cursorInView;
 270
 271         // we moved or popup state is not ok for popup?
 272         if ((moved && !keep) || !possiblePopupState)
 273                 hidePopup(cur);
 274
 275         // we moved or inline state is not ok for inline completion?
 276         if ((moved && !keep) || !possibleInlineState)
 277                 hideInline(cur);
 278
 279         // we inserted something and are in a possible popup state?
 280         if (!popupVisible() && possiblePopupState && start
 281                 && cur.inset().automaticPopupCompletion())
 282                 popup_timer_.start(int(lyxrc.completion_popup_delay * 1000));
 283
 284         // we inserted something and are in a possible inline completion state?
 285         if (!inlineVisible() && possibleInlineState && start
 286                 && cur.inset().automaticInlineCompletion())
 287                 inline_timer_.start(int(lyxrc.completion_inline_delay * 1000));
 288
 289         // update prefix if popup is visible or if it will be visible soon
 290         if (popupVisible() || inlineVisible()
 291             || popup_timer_.isActive() || inline_timer_.isActive())
 292                 updatePrefix(cur);
 293 }
 294
 295
 296 void GuiCompleter::updateVisibility(bool start, bool keep)
 297 {
 298         Cursor cur = gui_->bufferView().cursor();
 299         cur.updateFlags(Update::None);
 300
 301         updateVisibility(cur, start, keep);
 302
 303         if (cur.disp_.update())
 304                 gui_->bufferView().processUpdateFlags(cur.disp_.update());
 305 }
 306
 307
 308 void GuiCompleter::updatePrefix(Cursor & cur)
 309 {
 310         // get new prefix. Do nothing if unchanged
 311         QString newPrefix = toqstr(cur.inset().completionPrefix(cur));
 312         if (newPrefix == completionPrefix())
 313                 return;
 314
 315         // value which should be kept selected
 316         QString old = currentCompletion();
 317         if (old.length() == 0)
 318                 old = last_selection_;
 319
 320         // update completer to new prefix
 321         setCompletionPrefix(newPrefix);
 322
 323         // update popup because its size might have changed
 324         if (popupVisible())
 325                 updatePopup(cur);
 326
 327         // restore old selection
 328         setCurrentCompletion(old);
 329
 330         // if popup is not empty, the new selection will
 331         // be our last valid one
 332         QString const & s = currentCompletion();
 333         if (s.length() > 0)
 334                 last_selection_ = s;
 335         else
 336                 last_selection_ = old;
 337
 338         // update inline completion because the default
 339         // completion string might have changed
 340         if (inlineVisible())
 341                 updateInline(cur, s);
 342 }
 343
 344
 345 void GuiCompleter::updateInline(Cursor & cur, QString const & completion)
 346 {
 347         if (!cur.inset().inlineCompletionSupported(cur))
 348                 return;
 349
 350         // compute postfix
 351         docstring prefix = cur.inset().completionPrefix(cur);
 352         docstring postfix = from_utf8(fromqstr(completion.mid(prefix.length())));
 353
 354         // shorten it if necessary
 355         if (lyxrc.completion_inline_dots != -1
 356             && postfix.size() > unsigned(lyxrc.completion_inline_dots))
 357                 postfix = postfix.substr(0, lyxrc.completion_inline_dots - 1) + "...";
 358
 359         // set inline completion at cursor position
 360         size_t uniqueTo = max(longestUniqueCompletion().size(), prefix.size());
 361         gui_->bufferView().setInlineCompletion(cur, cur, postfix, uniqueTo - prefix.size());
 362         inlineVisible_ = true;
 363 }
 364
 365
 366 void GuiCompleter::updatePopup(Cursor & cur)
 367 {
 368         if (!cur.inset().completionSupported(cur))
 369                 return;
 370
 371         if (completionCount() == 0)
 372                 return;
 373
 374         // get dimensions of completion prefix
 375         Dimension dim;
 376         int x;
 377         int y;
 378         cur.inset().completionPosAndDim(cur, x, y, dim);
 379
 380         // and calculate the rect of the popup
 381         QRect rect;
 382         if (popup()->layoutDirection() == Qt::RightToLeft)
 383                 rect = QRect(x + dim.width() - 200, y - dim.ascent() - 3, 200, dim.height() + 6);
 384         else
 385                 rect = QRect(x, y - dim.ascent() - 3, 200, dim.height() + 6);
 386
 387         // show/update popup
 388         QTreeView * p = static_cast<QTreeView *>(popup());
 389         p->setColumnWidth(0, popup()->width() - 22 - p->verticalScrollBar()->width());
 390
 391         complete(rect);
 392 }
 393
 394
 395 void GuiCompleter::updateModel(Cursor & cur, bool popupUpdate, bool inlineUpdate)
 396 {
 397         // value which should be kept selected
 398         QString old = currentCompletion();
 399         if (old.length() == 0)
 400                 old = last_selection_;
 401
 402         // set whether rtl
 403         bool rtl = false;
 404         if (cur.inTexted()) {
 405                 Paragraph const & par = cur.paragraph();
 406                 Font const font =
 407                 par.getFontSettings(cur.bv().buffer().params(), cur.pos());
 408                 rtl = font.isVisibleRightToLeft();
 409         }
 410         popup()->setLayoutDirection(rtl ? Qt::RightToLeft : Qt::LeftToRight);
 411
 412         // turn the direction of the strings in the popup.
 413         // Qt does not do that itself.
 414         popup()->setItemDelegateForColumn(0, rtl ? rtlItemDelegate_ : 0);
 415
 416         // set new model
 417         Inset::CompletionList const * list = cur.inset().createCompletionList(cur);
 418         setModel(new GuiCompletionModel(this, list));
 419         if (list->sorted())
 420                 setModelSorting(QCompleter::CaseSensitivelySortedModel);
 421         else
 422                 setModelSorting(QCompleter::UnsortedModel);
 423
 424         // set prefix
 425         QString newPrefix = toqstr(cur.inset().completionPrefix(cur));
 426         if (newPrefix != completionPrefix())
 427                 setCompletionPrefix(newPrefix);
 428
 429         // show popup
 430         if (popupUpdate)
 431                 updatePopup(cur);
 432
 433         // restore old selection
 434         setCurrentCompletion(old);
 435
 436         // if popup is not empty, the new selection will
 437         // be our last valid one
 438         QString const & s = currentCompletion();
 439         if (s.length() > 0)
 440                 last_selection_ = s;
 441         else
 442                 last_selection_ = old;
 443
 444         // show inline completion
 445         if (inlineUpdate)
 446                 updateInline(cur, currentCompletion());
 447 }
 448
 449
 450 void GuiCompleter::showPopup(Cursor & cur)
 451 {
 452         if (!popupPossible(cur))
 453                 return;
 454
 455         updateModel(cur, true, inlineVisible());
 456 }
 457
 458
 459 void GuiCompleter::hidePopup(Cursor & cur)
 460 {
 461         popup()->hide();
 462         if (popup_timer_.isActive())
 463                 popup_timer_.stop();
 464
 465         if (!inlineVisible())
 466                 setModel(new GuiCompletionModel(this, 0));
 467 }
 468
 469
 470 void GuiCompleter::showInline(Cursor & cur)
 471 {
 472         if (!inlinePossible(cur))
 473                 return;
 474
 475         updateModel(cur, popupVisible(), true);
 476 }
 477
 478
 479 void GuiCompleter::hideInline(Cursor & cur)
 480 {
 481         gui_->bufferView().setInlineCompletion(cur, DocIterator(), docstring());
 482         inlineVisible_ = false;
 483
 484         if (!popupVisible())
 485                 setModel(new GuiCompletionModel(this, 0));
 486 }
 487
 488
 489 void GuiCompleter::showPopup()
 490 {
 491         Cursor cur = gui_->bufferView().cursor();
 492         cur.updateFlags(Update::None);
 493
 494         showPopup(cur);
 495
 496         // redraw if needed
 497         if (cur.disp_.update())
 498                 gui_->bufferView().processUpdateFlags(cur.disp_.update());
 499 }
 500
 501
 502 void GuiCompleter::showInline()
 503 {
 504         Cursor cur = gui_->bufferView().cursor();
 505         cur.updateFlags(Update::None);
 506
 507         showInline(cur);
 508
 509         // redraw if needed
 510         if (cur.disp_.update())
 511                 gui_->bufferView().processUpdateFlags(cur.disp_.update());
 512 }
 513
 514
 515 void GuiCompleter::hidePopup()
 516 {
 517         Cursor cur = gui_->bufferView().cursor();
 518         cur.updateFlags(Update::None);
 519
 520         hidePopup(cur);
 521
 522         // redraw if needed
 523         if (cur.disp_.update())
 524                 gui_->bufferView().processUpdateFlags(cur.disp_.update());
 525 }
 526
 527
 528 void GuiCompleter::hideInline()
 529 {
 530         Cursor cur = gui_->bufferView().cursor();
 531         cur.updateFlags(Update::None);
 532
 533         hideInline(cur);
 534
 535         // redraw if needed
 536         if (cur.disp_.update())
 537                 gui_->bufferView().processUpdateFlags(cur.disp_.update());
 538 }
 539
 540
 541 void GuiCompleter::activate()
 542 {
 543         if (!popupVisible() && !inlineVisible())
 544                 return;
 545
 546         popupActivated(currentCompletion());
 547 }
 548
 549
 550 void GuiCompleter::tab()
 551 {
 552         BufferView * bv = &gui_->bufferView();
 553         Cursor cur = bv->cursor();
 554         cur.updateFlags(Update::None);
 555
 556         // check that inline completion is active
 557         if (!inlineVisible()) {
 558                 // try to activate the inline completion
 559                 if (cur.inset().inlineCompletionSupported(cur)) {
 560                         showInline();
 561
 562                         // show popup without delay because the completion was not unique
 563                         if (lyxrc.completion_popup_after_complete
 564                             && !popupVisible()
 565                             && popup()->model()->rowCount() > 1)
 566                                 popup_timer_.start(0);
 567
 568                         return;
 569                 }
 570                 // or try popup
 571                 if (!popupVisible() && cur.inset().completionSupported(cur)) {
 572                         showPopup();
 573                         return;
 574                 }
 575
 576                 return;
 577         }
 578
 579         // If completion is active, at least complete by one character
 580         docstring prefix = cur.inset().completionPrefix(cur);
 581         docstring completion = from_utf8(fromqstr(currentCompletion()));
 582         if (completion.size() <= prefix.size()) {
 583                 // finalize completion
 584                 cur.inset().insertCompletion(cur, docstring(), true);
 585
 586                 // hide popup and inline completion
 587                 hidePopup(cur);
 588                 hideInline(cur);
 589                 updateVisibility(false, false);
 590                 return;
 591         }
 592         docstring nextchar = completion.substr(prefix.size(), 1);
 593         if (!cur.inset().insertCompletion(cur, nextchar, false))
 594                 return;
 595         updatePrefix(cur);
 596
 597         // try to complete as far as it is unique
 598         docstring longestCompletion = longestUniqueCompletion();
 599         prefix = cur.inset().completionPrefix(cur);
 600         docstring postfix = longestCompletion.substr(min(longestCompletion.size(), prefix.size()));
 601         cur.inset().insertCompletion(cur, postfix, false);
 602         old_cursor_ = bv->cursor();
 603         updatePrefix(cur);
 604
 605         // show popup without delay because the completion was not unique
 606         if (lyxrc.completion_popup_after_complete
 607             && !popupVisible()
 608             && popup()->model()->rowCount() > 1)
 609                 popup_timer_.start(0);
 610
 611         // redraw if needed
 612         if (cur.disp_.update())
 613                 gui_->bufferView().processUpdateFlags(cur.disp_.update());
 614 }
 615
 616
 617 QString GuiCompleter::currentCompletion() const
 618 {
 619         if (!popup()->selectionModel()->hasSelection())
 620                 return QString();
 621
 622         // Not sure if this is bug in Qt: currentIndex() always
 623         // return the first element in the list.
 624         QModelIndex idx = popup()->currentIndex();
 625         return popup()->model()->data(idx, Qt::EditRole).toString();
 626 }
 627
 628
 629 void GuiCompleter::setCurrentCompletion(QString const & s)
 630 {
 631         QAbstractItemModel const & model = *popup()->model();
 632         size_t n = model.rowCount();
 633         if (n == 0)
 634                 return;
 635
 636         // select the first if s is empty
 637         if (s.length() == 0) {
 638                 updateLock_++;
 639                 popup()->setCurrentIndex(model.index(0, 0));
 640                 updateLock_--;
 641                 return;
 642         }
 643
 644         // find old selection in model
 645         size_t i;
 646         if (modelSorting() == QCompleter::UnsortedModel) {
 647                 // In unsorted models, iterate through list until the s is found
 648                 for (i = 0; i < n; ++i) {
 649                         QString const & is
 650                         = model.data(model.index(i, 0), Qt::EditRole).toString();
 651                         if (is == s)
 652                                 break;
 653                 }
 654         } else {
 655                 // In sorted models, do binary search for s.
 656                 int l = 0;
 657                 int r = n - 1;
 658                 while (r >= l && l < int(n)) {
 659                         size_t mid = (r + l) / 2;
 660                         QString const & mids
 661                         = model.data(model.index(mid, 0),
 662                                      Qt::EditRole).toString();
 663
 664                         // left or right?
 665                         // FIXME: is this really the same order that the docstring
 666                         // from the CompletionList has?
 667                         int c = s.compare(mids, Qt::CaseSensitive);
 668                         if (c == 0) {
 669                                 l = mid;
 670                                 break;
 671                         } else if (l == r) {
 672                                 l = n;
 673                                 break;
 674                         } else if (c > 0)
 675                                 // middle is not far enough
 676                                 l = mid + 1;
 677                         else
 678                                 // middle is too far
 679                                 r = mid - 1;
 680                 }
 681
 682                 // loop was left without finding anything
 683                 if (r < l)
 684                         i = n;
 685                 else
 686                         i = l;
 687                 BOOST_ASSERT(0 <= i && i <= n);
 688         }
 689
 690         // select the first if none was found
 691         if (i == n)
 692                 i = 0;
 693
 694         updateLock_++;
 695         popup()->setCurrentIndex(model.index(i, 0));
 696         updateLock_--;
 697 }
 698
 699
 700 size_t commonPrefix(QString const & s1, QString const & s2)
 701 {
 702         // find common prefix
 703         size_t j;
 704         size_t n1 = s1.length();
 705         size_t n2 = s2.length();
 706         for (j = 0; j < n1 && j < n2; ++j) {
 707                 if (s1.at(j) != s2.at(j))
 708                         break;
 709         }
 710         return j;
 711 }
 712
 713
 714 docstring GuiCompleter::longestUniqueCompletion() const
 715 {
 716         QAbstractItemModel const & model = *popup()->model();
 717         QString s = currentCompletion();
 718         size_t n = model.rowCount();
 719
 720         if (modelSorting() == QCompleter::UnsortedModel) {
 721                 // For unsorted model we cannot do more than iteration.
 722                 // Iterate through the completions and cut off where s differs
 723                 for (size_t i = 0; i < n && s.length() > 0; ++i) {
 724                         QString const & is
 725                         = model.data(model.index(i, 0), Qt::EditRole).toString();
 726
 727                         s = s.left(commonPrefix(is, s));
 728                 }
 729         } else {
 730                 // For sorted models we can do binary search multiple times,
 731                 // each time to find the first string which has s not as prefix.
 732                 size_t i = 0;
 733                 while (i < n && s.length() > 0) {
 734                         // find first string that does not have s as prefix
 735                         // via binary search in [i,n-1]
 736                         size_t r = n - 1;
 737                         do {
 738                                 // get common prefix with the middle string
 739                                 size_t mid = (r + i) / 2;
 740                                 QString const & mids
 741                                 = model.data(model.index(mid, 0),
 742                                         Qt::EditRole).toString();
 743                                 size_t oldLen = s.length();
 744                                 size_t len = commonPrefix(mids, s);
 745                                 s = s.left(len);
 746
 747                                 // left or right?
 748                                 if (oldLen == len) {
 749                                         // middle is not far enough
 750                                         i = mid + 1;
 751                                 } else {
 752                                         // middle is maybe too far
 753                                         r = mid;
 754                                 }
 755                         } while (r - i > 0 && i < n);
 756                 }
 757         }
 758
 759         return from_utf8(fromqstr(s));
 760 }
 761
 762
 763 void GuiCompleter::popupActivated(const QString & completion)
 764 {
 765         Cursor cur = gui_->bufferView().cursor();
 766         cur.updateFlags(Update::None);
 767
 768         docstring prefix = cur.inset().completionPrefix(cur);
 769         docstring postfix = from_utf8(fromqstr(completion.mid(prefix.length())));
 770         cur.inset().insertCompletion(cur, postfix, true);
 771         hidePopup(cur);
 772         hideInline(cur);
 773
 774         if (cur.disp_.update())
 775                 gui_->bufferView().processUpdateFlags(cur.disp_.update());
 776 }
 777
 778
 779 void GuiCompleter::popupHighlighted(const QString & completion)
 780 {
 781         if (updateLock_ > 0)
 782                 return;
 783
 784         Cursor cur = gui_->bufferView().cursor();
 785         cur.updateFlags(Update::None);
 786
 787         if (inlineVisible())
 788                 updateInline(cur, completion);
 789
 790         if (cur.disp_.update())
 791                 gui_->bufferView().processUpdateFlags(cur.disp_.update());
 792 }
 793
 794 } // namespace frontend
 795 } // namespace lyx
 796
 797 #include "GuiCompleter_moc.cpp"