src/frontends/qt4/GuiWorkArea.cpp

   1 /**
   2  * \file GuiWorkArea.cpp
   3  * This file is part of LyX, the document processor.
   4  * Licence details can be found in the file COPYING.
   5  *
   6  * \author John Levon
   7  * \author Abdelrazak Younes
   8  *
   9  * Full author contact details are available in file CREDITS.
  10  */
  11
  12 #include <config.h>
  13
  14 #include "GuiWorkArea.h"
  15 #include "GuiWorkArea_Private.h"
  16
  17 #include "ColorCache.h"
  18 #include "FontLoader.h"
  19 #include "Menus.h"
  20
  21 #include "Buffer.h"
  22 #include "BufferList.h"
  23 #include "BufferParams.h"
  24 #include "BufferView.h"
  25 #include "CoordCache.h"
  26 #include "Cursor.h"
  27 #include "Font.h"
  28 #include "FuncRequest.h"
  29 #include "GuiApplication.h"
  30 #include "GuiCompleter.h"
  31 #include "GuiKeySymbol.h"
  32 #include "GuiPainter.h"
  33 #include "GuiView.h"
  34 #include "KeySymbol.h"
  35 #include "Language.h"
  36 #include "LyX.h"
  37 #include "LyXRC.h"
  38 #include "LyXVC.h"
  39 #include "qt_helpers.h"
  40 #include "Text.h"
  41 #include "TextMetrics.h"
  42 #include "version.h"
  43
  44 #include "graphics/GraphicsImage.h"
  45 #include "graphics/GraphicsLoader.h"
  46
  47 #include "support/convert.h"
  48 #include "support/debug.h"
  49 #include "support/gettext.h"
  50 #include "support/lassert.h"
  51 #include "support/TempFile.h"
  52
  53 #include "frontends/Application.h"
  54 #include "frontends/FontMetrics.h"
  55 #include "frontends/WorkAreaManager.h"
  56
  57 #include <QContextMenuEvent>
  58 #if (QT_VERSION < 0x050000)
  59 #include <QInputContext>
  60 #endif
  61 #include <QDrag>
  62 #include <QHelpEvent>
  63 #ifdef Q_OS_MAC
  64 #include <QProxyStyle>
  65 #endif
  66 #include <QMainWindow>
  67 #include <QMimeData>
  68 #include <QMenu>
  69 #include <QPainter>
  70 #include <QPalette>
  71 #include <QPixmapCache>
  72 #include <QScrollBar>
  73 #include <QStyleOption>
  74 #include <QStylePainter>
  75 #include <QTimer>
  76 #include <QToolButton>
  77 #include <QToolTip>
  78 #include <QMenuBar>
  79
  80 #include "support/bind.h"
  81
  82 #include <cmath>
  83 #include <iostream>
  84
  85 int const TabIndicatorWidth = 3;
  86
  87 #undef KeyPress
  88 #undef NoModifier
  89
  90 using namespace std;
  91 using namespace lyx::support;
  92
  93 namespace lyx {
  94
  95
  96 /// return the LyX mouse button state from Qt's
  97 static mouse_button::state q_button_state(Qt::MouseButton button)
  98 {
  99         mouse_button::state b = mouse_button::none;
 100         switch (button) {
 101                 case Qt::LeftButton:
 102                         b = mouse_button::button1;
 103                         break;
 104                 case Qt::MidButton:
 105                         b = mouse_button::button2;
 106                         break;
 107                 case Qt::RightButton:
 108                         b = mouse_button::button3;
 109                         break;
 110                 default:
 111                         break;
 112         }
 113         return b;
 114 }
 115
 116
 117 /// return the LyX mouse button state from Qt's
 118 mouse_button::state q_motion_state(Qt::MouseButtons state)
 119 {
 120         mouse_button::state b = mouse_button::none;
 121         if (state & Qt::LeftButton)
 122                 b |= mouse_button::button1;
 123         if (state & Qt::MidButton)
 124                 b |= mouse_button::button2;
 125         if (state & Qt::RightButton)
 126                 b |= mouse_button::button3;
 127         return b;
 128 }
 129
 130
 131 namespace frontend {
 132
 133 class CursorWidget {
 134 public:
 135         CursorWidget() : rtl_(false), l_shape_(false), completable_(false),
 136                 show_(false), x_(0), cursor_width_(0)
 137         {
 138                 recomputeWidth();
 139         }
 140
 141         void draw(QPainter & painter)
 142         {
 143                 if (!show_ || !rect_.isValid())
 144                         return;
 145
 146                 int y = rect_.top();
 147                 int l = x_ - rect_.left();
 148                 int r = rect_.right() - x_;
 149                 int bot = rect_.bottom();
 150
 151                 // draw vertical line
 152                 painter.fillRect(x_, y, cursor_width_, rect_.height(), color_);
 153
 154                 // draw RTL/LTR indication
 155                 painter.setPen(color_);
 156                 if (l_shape_) {
 157                         if (rtl_)
 158                                 painter.drawLine(x_, bot, x_ - l, bot);
 159                         else
 160                                 painter.drawLine(x_, bot, x_ + cursor_width_ + r, bot);
 161                 }
 162
 163                 // draw completion triangle
 164                 if (completable_) {
 165                         int m = y + rect_.height() / 2;
 166                         int d = TabIndicatorWidth - 1;
 167                         if (rtl_) {
 168                                 painter.drawLine(x_ - 1, m - d, x_ - 1 - d, m);
 169                                 painter.drawLine(x_ - 1, m + d, x_ - 1 - d, m);
 170                         } else {
 171                                 painter.drawLine(x_ + cursor_width_, m - d, x_ + cursor_width_ + d, m);
 172                                 painter.drawLine(x_ + cursor_width_, m + d, x_ + cursor_width_ + d, m);
 173                         }
 174                 }
 175         }
 176
 177         void update(int x, int y, int h, bool l_shape,
 178                 bool rtl, bool completable)
 179         {
 180                 color_ = guiApp->colorCache().get(Color_cursor);
 181                 l_shape_ = l_shape;
 182                 rtl_ = rtl;
 183                 completable_ = completable;
 184                 x_ = x;
 185
 186                 // extension to left and right
 187                 int l = 0;
 188                 int r = 0;
 189
 190                 // RTL/LTR indication
 191                 if (l_shape_) {
 192                         if (rtl)
 193                                 l += h / 3;
 194                         else
 195                                 r += h / 3;
 196                 }
 197
 198                 // completion triangle
 199                 if (completable_) {
 200                         if (rtl)
 201                                 l = max(l, TabIndicatorWidth);
 202                         else
 203                                 r = max(r, TabIndicatorWidth);
 204                 }
 205
 206                 // compute overall rectangle
 207                 rect_ = QRect(x - l, y, cursor_width_ + r + l, h);
 208         }
 209
 210         void show(bool set_show = true) { show_ = set_show; }
 211         void hide() { show_ = false; }
 212         int cursorWidth() const { return cursor_width_; }
 213         void recomputeWidth() {
 214                 cursor_width_ = lyxrc.cursor_width
 215                         ? lyxrc.cursor_width
 216                         : 1 + int((lyxrc.currentZoom + 50) / 200.0);
 217         }
 218
 219         QRect const & rect() { return rect_; }
 220
 221 private:
 222         /// cursor is in RTL or LTR text
 223         bool rtl_;
 224         /// indication for RTL or LTR
 225         bool l_shape_;
 226         /// triangle to show that a completion is available
 227         bool completable_;
 228         ///
 229         bool show_;
 230         ///
 231         QColor color_;
 232         /// rectangle, possibly with l_shape and completion triangle
 233         QRect rect_;
 234         /// x position (were the vertical line is drawn)
 235         int x_;
 236
 237         int cursor_width_;
 238 };
 239
 240
 241 // This is a 'heartbeat' generating synthetic mouse move events when the
 242 // cursor is at the top or bottom edge of the viewport. One scroll per 0.2 s
 243 SyntheticMouseEvent::SyntheticMouseEvent()
 244         : timeout(200), restart_timeout(true)
 245 {}
 246
 247
 248 GuiWorkArea::Private::Private(GuiWorkArea * parent)
 249 : p(parent), screen_(0), buffer_view_(0), lyx_view_(0),
 250   cursor_visible_(false), cursor_(0),
 251   need_resize_(false), schedule_redraw_(false), preedit_lines_(1),
 252   pixel_ratio_(1.0),
 253   completer_(new GuiCompleter(p, p)), dialog_mode_(false),
 254   read_only_(false), clean_(true), externally_modified_(false)
 255 {
 256 }
 257
 258
 259 GuiWorkArea::GuiWorkArea(QWidget * /* w */)
 260 : d(new Private(this))
 261 {
 262 }
 263
 264
 265 GuiWorkArea::GuiWorkArea(Buffer & buffer, GuiView & gv)
 266 : d(new Private(this))
 267 {
 268         setGuiView(gv);
 269         buffer.params().display_pixel_ratio = theGuiApp()->pixelRatio();
 270         setBuffer(buffer);
 271         init();
 272 }
 273
 274
 275 double GuiWorkArea::pixelRatio() const
 276 {
 277 #if QT_VERSION >= 0x050000
 278         return qt_scale_factor * devicePixelRatio();
 279 #else
 280         return 1.0;
 281 #endif
 282 }
 283
 284
 285 void GuiWorkArea::init()
 286 {
 287         // Setup the signals
 288         connect(&d->cursor_timeout_, SIGNAL(timeout()),
 289                 this, SLOT(toggleCursor()));
 290
 291         int const time = QApplication::cursorFlashTime() / 2;
 292         if (time > 0) {
 293                 d->cursor_timeout_.setInterval(time);
 294                 d->cursor_timeout_.start();
 295         } else {
 296                 // let's initialize this just to be safe
 297                 d->cursor_timeout_.setInterval(500);
 298         }
 299
 300         d->resetScreen();
 301         // With Qt4.5 a mouse event will happen before the first paint event
 302         // so make sure that the buffer view has an up to date metrics.
 303         d->buffer_view_->resize(viewport()->width(), viewport()->height());
 304         d->cursor_ = new frontend::CursorWidget();
 305         d->cursor_->hide();
 306
 307         setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 308         setAcceptDrops(true);
 309         setMouseTracking(true);
 310         setMinimumSize(100, 70);
 311         setFrameStyle(QFrame::NoFrame);
 312         updateWindowTitle();
 313
 314         viewport()->setAutoFillBackground(false);
 315         // We don't need double-buffering nor SystemBackground on
 316         // the viewport because we have our own backing pixmap.
 317         viewport()->setAttribute(Qt::WA_NoSystemBackground);
 318
 319         setFocusPolicy(Qt::StrongFocus);
 320
 321         d->setCursorShape(Qt::IBeamCursor);
 322
 323         // This connection is closed at the same time as this is destroyed.
 324         d->synthetic_mouse_event_.timeout.timeout.connect([this](){
 325                         generateSyntheticMouseEvent();
 326                 });
 327
 328         LYXERR(Debug::GUI, "viewport width: " << viewport()->width()
 329                 << "  viewport height: " << viewport()->height());
 330
 331         // Enables input methods for asian languages.
 332         // Must be set when creating custom text editing widgets.
 333         setAttribute(Qt::WA_InputMethodEnabled, true);
 334
 335         d->dialog_mode_ = false;
 336 }
 337
 338
 339 GuiWorkArea::~GuiWorkArea()
 340 {
 341         // If something is wrong with the buffer, we can ignore it safely
 342         try {
 343                 d->buffer_view_->buffer().workAreaManager().remove(this);
 344         } catch(...) {}
 345         delete d->screen_;
 346         delete d->buffer_view_;
 347         delete d->cursor_;
 348         // Completer has a QObject parent and is thus automatically destroyed.
 349         // See #4758.
 350         // delete completer_;
 351         delete d;
 352 }
 353
 354
 355 Qt::CursorShape GuiWorkArea::cursorShape() const
 356 {
 357         return viewport()->cursor().shape();
 358 }
 359
 360
 361 void GuiWorkArea::Private::setCursorShape(Qt::CursorShape shape)
 362 {
 363         p->viewport()->setCursor(shape);
 364 }
 365
 366
 367 void GuiWorkArea::Private::updateCursorShape()
 368 {
 369         setCursorShape(buffer_view_->clickableInset()
 370                 ? Qt::PointingHandCursor : Qt::IBeamCursor);
 371 }
 372
 373
 374 void GuiWorkArea::setGuiView(GuiView & gv)
 375 {
 376         d->lyx_view_ = &gv;
 377 }
 378
 379
 380 void GuiWorkArea::setBuffer(Buffer & buffer)
 381 {
 382         delete d->buffer_view_;
 383         d->buffer_view_ = new BufferView(buffer);
 384         buffer.workAreaManager().add(this);
 385
 386         // HACK: Prevents an additional redraw when the scrollbar pops up
 387         // which regularily happens on documents with more than one page.
 388         // The policy  should be set to "Qt::ScrollBarAsNeeded" soon.
 389         // Since we have no geometry information yet, we assume that
 390         // a document needs a scrollbar if there is more then four
 391         // paragraph in the outermost text.
 392         if (buffer.text().paragraphs().size() > 4)
 393                 setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
 394         QTimer::singleShot(50, this, SLOT(fixVerticalScrollBar()));
 395         Q_EMIT bufferViewChanged();
 396 }
 397
 398
 399 void GuiWorkArea::fixVerticalScrollBar()
 400 {
 401         if (!isFullScreen())
 402                 setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
 403 }
 404
 405
 406 void GuiWorkArea::close()
 407 {
 408         d->lyx_view_->removeWorkArea(this);
 409 }
 410
 411
 412 void GuiWorkArea::setFullScreen(bool full_screen)
 413 {
 414         d->buffer_view_->setFullScreen(full_screen);
 415         setFrameStyle(QFrame::NoFrame);
 416         if (full_screen) {
 417                 setFrameStyle(QFrame::NoFrame);
 418                 if (lyxrc.full_screen_scrollbar)
 419                         setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 420         } else
 421                 setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
 422 }
 423
 424
 425 BufferView & GuiWorkArea::bufferView()
 426 {
 427         return *d->buffer_view_;
 428 }
 429
 430
 431 BufferView const & GuiWorkArea::bufferView() const
 432 {
 433         return *d->buffer_view_;
 434 }
 435
 436
 437 void GuiWorkArea::stopBlinkingCursor()
 438 {
 439         d->cursor_timeout_.stop();
 440         d->hideCursor();
 441 }
 442
 443
 444 void GuiWorkArea::startBlinkingCursor()
 445 {
 446         // do not show the cursor if the view is busy
 447         if (view().busy())
 448                 return;
 449
 450         Point p;
 451         int h = 0;
 452         d->buffer_view_->cursorPosAndHeight(p, h);
 453         // Don't start blinking if the cursor isn't on screen.
 454         if (!d->buffer_view_->cursorInView(p, h))
 455                 return;
 456
 457         d->showCursor();
 458
 459         //we're not supposed to cache this value.
 460         int const time = QApplication::cursorFlashTime() / 2;
 461         if (time <= 0)
 462                 return;
 463         d->cursor_timeout_.setInterval(time);
 464         d->cursor_timeout_.start();
 465 }
 466
 467
 468 void GuiWorkArea::redraw(bool update_metrics)
 469 {
 470         if (!isVisible())
 471                 // No need to redraw in this case.
 472                 return;
 473
 474         // No need to do anything if this is the current view. The BufferView
 475         // metrics are already up to date.
 476         if (update_metrics || d->lyx_view_ != guiApp->currentView()
 477                 || d->lyx_view_->currentWorkArea() != this) {
 478                 // FIXME: it would be nice to optimize for the off-screen case.
 479                 d->buffer_view_->cursor().fixIfBroken();
 480                 d->buffer_view_->updateMetrics();
 481                 d->buffer_view_->cursor().fixIfBroken();
 482         }
 483
 484         // update cursor position, because otherwise it has to wait until
 485         // the blinking interval is over
 486         if (d->cursor_visible_) {
 487                 d->hideCursor();
 488                 d->showCursor();
 489         }
 490
 491         LYXERR(Debug::WORKAREA, "WorkArea::redraw screen");
 492         d->updateScreen();
 493         update(0, 0, viewport()->width(), viewport()->height());
 494
 495         /// \warning: scrollbar updating *must* be done after the BufferView is drawn
 496         /// because \c BufferView::updateScrollbar() is called in \c BufferView::draw().
 497         d->updateScrollbar();
 498         d->lyx_view_->updateStatusBar();
 499
 500         if (lyxerr.debugging(Debug::WORKAREA))
 501                 d->buffer_view_->coordCache().dump();
 502
 503         updateWindowTitle();
 504
 505         d->updateCursorShape();
 506 }
 507
 508
 509 // Keep in sync with GuiWorkArea::processKeySym below
 510 bool GuiWorkArea::queryKeySym(KeySymbol const & key, KeyModifier mod) const
 511 {
 512         return guiApp->queryKeySym(key, mod);
 513 }
 514
 515
 516 // Keep in sync with GuiWorkArea::queryKeySym above
 517 void GuiWorkArea::processKeySym(KeySymbol const & key, KeyModifier mod)
 518 {
 519         if (d->lyx_view_->isFullScreen() && d->lyx_view_->menuBar()->isVisible()
 520                 && lyxrc.full_screen_menubar) {
 521                 // FIXME HACK: we should not have to do this here. See related comment
 522                 // in GuiView::event() (QEvent::ShortcutOverride)
 523                 d->lyx_view_->menuBar()->hide();
 524         }
 525
 526         // In order to avoid bad surprise in the middle of an operation,
 527         // we better stop the blinking cursor...
 528         // the cursor gets restarted in GuiView::restartCursor()
 529         stopBlinkingCursor();
 530         guiApp->processKeySym(key, mod);
 531 }
 532
 533
 534 void GuiWorkArea::Private::dispatch(FuncRequest const & cmd)
 535 {
 536         // Handle drag&drop
 537         if (cmd.action() == LFUN_FILE_OPEN) {
 538                 DispatchResult dr;
 539                 lyx_view_->dispatch(cmd, dr);
 540                 return;
 541         }
 542
 543         bool const notJustMovingTheMouse =
 544                 cmd.action() != LFUN_MOUSE_MOTION || cmd.button() != mouse_button::none;
 545
 546         // In order to avoid bad surprise in the middle of an operation, we better stop
 547         // the blinking cursor.
 548         if (notJustMovingTheMouse)
 549                 p->stopBlinkingCursor();
 550
 551         buffer_view_->mouseEventDispatch(cmd);
 552
 553         // Skip these when selecting
 554         // FIXME: let GuiView take care of those.
 555         if (cmd.action() != LFUN_MOUSE_MOTION) {
 556                 completer_->updateVisibility(false, false);
 557                 lyx_view_->updateDialogs();
 558                 lyx_view_->updateStatusBar();
 559         }
 560
 561         // GUI tweaks except with mouse motion with no button pressed.
 562         if (notJustMovingTheMouse) {
 563                 // Slight hack: this is only called currently when we
 564                 // clicked somewhere, so we force through the display
 565                 // of the new status here.
 566                 // FIXME: let GuiView take care of those.
 567                 lyx_view_->clearMessage();
 568
 569                 // Show the cursor immediately after any operation
 570                 p->startBlinkingCursor();
 571         }
 572
 573         updateCursorShape();
 574 }
 575
 576
 577 void GuiWorkArea::Private::resizeBufferView()
 578 {
 579         // WARNING: Please don't put any code that will trigger a repaint here!
 580         // We are already inside a paint event.
 581         p->stopBlinkingCursor();
 582         // Warn our container (GuiView).
 583         p->busy(true);
 584
 585         Point point;
 586         int h = 0;
 587         buffer_view_->cursorPosAndHeight(point, h);
 588         bool const cursor_in_view = buffer_view_->cursorInView(point, h);
 589         buffer_view_->resize(p->viewport()->width(), p->viewport()->height());
 590         if (cursor_in_view)
 591                 buffer_view_->scrollToCursor();
 592         updateScreen();
 593
 594         // Update scrollbars which might have changed due different
 595         // BufferView dimension. This is especially important when the
 596         // BufferView goes from zero-size to the real-size for the first time,
 597         // as the scrollbar paramters are then set for the first time.
 598         updateScrollbar();
 599
 600         need_resize_ = false;
 601         p->busy(false);
 602         // Eventually, restart the cursor after the resize event.
 603         // We might be resizing even if the focus is on another widget so we only
 604         // restart the cursor if we have the focus.
 605         if (p->hasFocus())
 606                 QTimer::singleShot(50, p, SLOT(startBlinkingCursor()));
 607 }
 608
 609
 610 void GuiWorkArea::Private::showCursor()
 611 {
 612         if (cursor_visible_)
 613                 return;
 614
 615         Point p;
 616         int h = 0;
 617         buffer_view_->cursorPosAndHeight(p, h);
 618         if (!buffer_view_->cursorInView(p, h))
 619                 return;
 620
 621         // RTL or not RTL
 622         bool l_shape = false;
 623         Font const & realfont = buffer_view_->cursor().real_current_font;
 624         BufferParams const & bp = buffer_view_->buffer().params();
 625         bool const samelang = realfont.language() == bp.language;
 626         bool const isrtl = realfont.isVisibleRightToLeft();
 627
 628         if (!samelang || isrtl != bp.language->rightToLeft())
 629                 l_shape = true;
 630
 631         // The ERT language hack needs fixing up
 632         if (realfont.language() == latex_language)
 633                 l_shape = false;
 634
 635         // show cursor on screen
 636         Cursor & cur = buffer_view_->cursor();
 637         bool completable = cur.inset().showCompletionCursor()
 638                 && completer_->completionAvailable()
 639                 && !completer_->popupVisible()
 640                 && !completer_->inlineVisible();
 641         cursor_visible_ = true;
 642         cursor_->recomputeWidth();
 643
 644         //int cur_x = buffer_view_->getPos(cur).x_;
 645         // We may have decided to slide the cursor row so that cursor
 646         // is visible.
 647         p.x_ -= buffer_view_->horizScrollOffset();
 648
 649         showCursor(p.x_, p.y_, h, l_shape, isrtl, completable);
 650 }
 651
 652
 653 void GuiWorkArea::Private::hideCursor()
 654 {
 655         if (!cursor_visible_)
 656                 return;
 657
 658         cursor_visible_ = false;
 659         removeCursor();
 660 }
 661
 662
 663 void GuiWorkArea::toggleCursor()
 664 {
 665         if (d->cursor_visible_)
 666                 d->hideCursor();
 667         else
 668                 d->showCursor();
 669 }
 670
 671
 672 void GuiWorkArea::Private::updateScrollbar()
 673 {
 674         // Prevent setRange() and setSliderPosition from causing recursive calls via
 675         // the signal valueChanged. (#10311)
 676         QObject::disconnect(p->verticalScrollBar(), SIGNAL(valueChanged(int)),
 677                             p, SLOT(scrollTo(int)));
 678         ScrollbarParameters const & scroll_ = buffer_view_->scrollbarParameters();
 679         p->verticalScrollBar()->setRange(scroll_.min, scroll_.max);
 680         p->verticalScrollBar()->setPageStep(scroll_.page_step);
 681         p->verticalScrollBar()->setSingleStep(scroll_.single_step);
 682         p->verticalScrollBar()->setSliderPosition(0);
 683         // Connect to the vertical scroll bar
 684         QObject::connect(p->verticalScrollBar(), SIGNAL(valueChanged(int)),
 685                          p, SLOT(scrollTo(int)));
 686 }
 687
 688
 689 void GuiWorkArea::scrollTo(int value)
 690 {
 691         stopBlinkingCursor();
 692         d->buffer_view_->scrollDocView(value, true);
 693
 694         if (lyxrc.cursor_follows_scrollbar) {
 695                 d->buffer_view_->setCursorFromScrollbar();
 696                 // FIXME: let GuiView take care of those.
 697                 d->lyx_view_->updateLayoutList();
 698         }
 699         // Show the cursor immediately after any operation.
 700         startBlinkingCursor();
 701         // FIXME QT5
 702 #ifdef Q_WS_X11
 703         QApplication::syncX();
 704 #endif
 705 }
 706
 707
 708 bool GuiWorkArea::event(QEvent * e)
 709 {
 710         switch (e->type()) {
 711         case QEvent::ToolTip: {
 712                 QHelpEvent * helpEvent = static_cast<QHelpEvent *>(e);
 713                 if (lyxrc.use_tooltip) {
 714                         QPoint pos = helpEvent->pos();
 715                         if (pos.x() < viewport()->width()) {
 716                                 QString s = toqstr(d->buffer_view_->toolTip(pos.x(), pos.y()));
 717                                 QToolTip::showText(helpEvent->globalPos(), formatToolTip(s,35));
 718                         }
 719                         else
 720                                 QToolTip::hideText();
 721                 }
 722                 // Don't forget to accept the event!
 723                 e->accept();
 724                 return true;
 725         }
 726
 727         case QEvent::ShortcutOverride:
 728                 // keyPressEvent is ShortcutOverride-aware and only accepts the event in
 729                 // this case
 730                 keyPressEvent(static_cast<QKeyEvent *>(e));
 731                 return e->isAccepted();
 732
 733         case QEvent::KeyPress: {
 734                 // We catch this event in order to catch the Tab or Shift+Tab key press
 735                 // which are otherwise reserved to focus switching between controls
 736                 // within a dialog.
 737                 QKeyEvent * ke = static_cast<QKeyEvent*>(e);
 738                 if ((ke->key() == Qt::Key_Tab && ke->modifiers() == Qt::NoModifier)
 739                         || (ke->key() == Qt::Key_Backtab && (
 740                                 ke->modifiers() == Qt::ShiftModifier
 741                                 || ke->modifiers() == Qt::NoModifier))) {
 742                         keyPressEvent(ke);
 743                         return true;
 744                 }
 745                 return QAbstractScrollArea::event(e);
 746         }
 747
 748         default:
 749                 return QAbstractScrollArea::event(e);
 750         }
 751         return false;
 752 }
 753
 754
 755 void GuiWorkArea::contextMenuEvent(QContextMenuEvent * e)
 756 {
 757         string name;
 758         if (e->reason() == QContextMenuEvent::Mouse)
 759                 // the menu name is set on mouse press
 760                 name = d->context_menu_name_;
 761         else {
 762                 QPoint pos = e->pos();
 763                 Cursor const & cur = d->buffer_view_->cursor();
 764                 if (e->reason() == QContextMenuEvent::Keyboard && cur.inTexted()) {
 765                         // Do not access the context menu of math right in front of before
 766                         // the cursor. This does not work when the cursor is in text.
 767                         Inset * inset = cur.paragraph().getInset(cur.pos());
 768                         if (inset && inset->asInsetMath())
 769                                 --pos.rx();
 770                         else if (cur.pos() > 0) {
 771                                 Inset * inset = cur.paragraph().getInset(cur.pos() - 1);
 772                                 if (inset)
 773                                         ++pos.rx();
 774                         }
 775                 }
 776                 name = d->buffer_view_->contextMenu(pos.x(), pos.y());
 777         }
 778
 779         if (name.empty()) {
 780                 e->accept();
 781                 return;
 782         }
 783         // always show mnemonics when the keyboard is used to show the context menu
 784         // FIXME: This should be fixed in Qt itself
 785         bool const keyboard = (e->reason() == QContextMenuEvent::Keyboard);
 786         QMenu * menu = guiApp->menus().menu(toqstr(name), *d->lyx_view_, keyboard);
 787         if (!menu) {
 788                 e->accept();
 789                 return;
 790         }
 791         // Position the menu to the right.
 792         // FIXME: menu position should be different for RTL text.
 793         menu->exec(e->globalPos());
 794         e->accept();
 795 }
 796
 797
 798 void GuiWorkArea::focusInEvent(QFocusEvent * e)
 799 {
 800         LYXERR(Debug::DEBUG, "GuiWorkArea::focusInEvent(): " << this << endl);
 801         if (d->lyx_view_->currentWorkArea() != this) {
 802                 d->lyx_view_->setCurrentWorkArea(this);
 803                 d->lyx_view_->currentWorkArea()->bufferView().buffer().updateBuffer();
 804         }
 805
 806         startBlinkingCursor();
 807         QAbstractScrollArea::focusInEvent(e);
 808 }
 809
 810
 811 void GuiWorkArea::focusOutEvent(QFocusEvent * e)
 812 {
 813         LYXERR(Debug::DEBUG, "GuiWorkArea::focusOutEvent(): " << this << endl);
 814         stopBlinkingCursor();
 815         QAbstractScrollArea::focusOutEvent(e);
 816 }
 817
 818
 819 void GuiWorkArea::mousePressEvent(QMouseEvent * e)
 820 {
 821         if (d->dc_event_.active && d->dc_event_ == *e) {
 822                 d->dc_event_.active = false;
 823                 FuncRequest cmd(LFUN_MOUSE_TRIPLE, e->x(), e->y(),
 824                         q_button_state(e->button()), q_key_state(e->modifiers()));
 825                 d->dispatch(cmd);
 826                 e->accept();
 827                 return;
 828         }
 829
 830 #if (QT_VERSION < 0x050000) && !defined(__HAIKU__)
 831         inputContext()->reset();
 832 #endif
 833
 834         FuncRequest const cmd(LFUN_MOUSE_PRESS, e->x(), e->y(),
 835                         q_button_state(e->button()), q_key_state(e->modifiers()));
 836         d->dispatch(cmd);
 837
 838         // Save the context menu on mouse press, because also the mouse
 839         // cursor is set on mouse press. Afterwards, we can either release
 840         // the mousebutton somewhere else, or the cursor might have moved
 841         // due to the DEPM. We need to do this after the mouse has been
 842         // set in dispatch(), because the selection state might change.
 843         if (e->button() == Qt::RightButton)
 844                 d->context_menu_name_ = d->buffer_view_->contextMenu(e->x(), e->y());
 845
 846         e->accept();
 847 }
 848
 849
 850 void GuiWorkArea::mouseReleaseEvent(QMouseEvent * e)
 851 {
 852         if (d->synthetic_mouse_event_.timeout.running())
 853                 d->synthetic_mouse_event_.timeout.stop();
 854
 855         FuncRequest const cmd(LFUN_MOUSE_RELEASE, e->x(), e->y(),
 856                         q_button_state(e->button()), q_key_state(e->modifiers()));
 857         d->dispatch(cmd);
 858         e->accept();
 859 }
 860
 861
 862 void GuiWorkArea::mouseMoveEvent(QMouseEvent * e)
 863 {
 864         // we kill the triple click if we move
 865         doubleClickTimeout();
 866         FuncRequest cmd(LFUN_MOUSE_MOTION, e->x(), e->y(),
 867                         q_motion_state(e->buttons()), q_key_state(e->modifiers()));
 868
 869         e->accept();
 870
 871         // If we're above or below the work area...
 872         if ((e->y() <= 20 || e->y() >= viewport()->height() - 20)
 873                         && e->buttons() == mouse_button::button1) {
 874                 // Make sure only a synthetic event can cause a page scroll,
 875                 // so they come at a steady rate:
 876                 if (e->y() <= 20)
 877                         // _Force_ a scroll up:
 878                         cmd.set_y(e->y() - 21);
 879                 else
 880                         cmd.set_y(e->y() + 21);
 881                 // Store the event, to be handled when the timeout expires.
 882                 d->synthetic_mouse_event_.cmd = cmd;
 883
 884                 if (d->synthetic_mouse_event_.timeout.running()) {
 885                         // Discard the event. Note that it _may_ be handled
 886                         // when the timeout expires if
 887                         // synthetic_mouse_event_.cmd has not been overwritten.
 888                         // Ie, when the timeout expires, we handle the
 889                         // most recent event but discard all others that
 890                         // occurred after the one used to start the timeout
 891                         // in the first place.
 892                         return;
 893                 }
 894
 895                 d->synthetic_mouse_event_.restart_timeout = true;
 896                 d->synthetic_mouse_event_.timeout.start();
 897                 // Fall through to handle this event...
 898
 899         } else if (d->synthetic_mouse_event_.timeout.running()) {
 900                 // Store the event, to be possibly handled when the timeout
 901                 // expires.
 902                 // Once the timeout has expired, normal control is returned
 903                 // to mouseMoveEvent (restart_timeout = false).
 904                 // This results in a much smoother 'feel' when moving the
 905                 // mouse back into the work area.
 906                 d->synthetic_mouse_event_.cmd = cmd;
 907                 d->synthetic_mouse_event_.restart_timeout = false;
 908                 return;
 909         }
 910         d->dispatch(cmd);
 911 }
 912
 913
 914 void GuiWorkArea::wheelEvent(QWheelEvent * ev)
 915 {
 916         // Wheel rotation by one notch results in a delta() of 120 (see
 917         // documentation of QWheelEvent)
 918         double const delta = ev->delta() / 120.0;
 919         bool zoom = false;
 920         switch (lyxrc.scroll_wheel_zoom) {
 921         case LyXRC::SCROLL_WHEEL_ZOOM_CTRL:
 922                 zoom = ev->modifiers() & Qt::ControlModifier;
 923                 zoom &= !(ev->modifiers() & (Qt::ShiftModifier | Qt::AltModifier));
 924                 break;
 925         case LyXRC::SCROLL_WHEEL_ZOOM_SHIFT:
 926                 zoom = ev->modifiers() & Qt::ShiftModifier;
 927                 zoom &= !(ev->modifiers() & (Qt::ControlModifier | Qt::AltModifier));
 928                 break;
 929         case LyXRC::SCROLL_WHEEL_ZOOM_ALT:
 930                 zoom = ev->modifiers() & Qt::AltModifier;
 931                 zoom &= !(ev->modifiers() & (Qt::ShiftModifier | Qt::ControlModifier));
 932                 break;
 933         case LyXRC::SCROLL_WHEEL_ZOOM_OFF:
 934                 break;
 935         }
 936         if (zoom) {
 937                 docstring arg = convert<docstring>(int(5 * delta));
 938                 lyx::dispatch(FuncRequest(LFUN_BUFFER_ZOOM_IN, arg));
 939                 return;
 940         }
 941
 942         // Take into account the desktop wide settings.
 943         int const lines = qApp->wheelScrollLines();
 944         int const page_step = verticalScrollBar()->pageStep();
 945         // Test if the wheel mouse is set to one screen at a time.
 946         // This is according to
 947         // https://doc.qt.io/qt-5/qapplication.html#wheelScrollLines-prop
 948         int scroll_value =
 949                 min(lines * verticalScrollBar()->singleStep(), page_step);
 950
 951         // Take into account the rotation and the user preferences.
 952         scroll_value = int(scroll_value * delta * lyxrc.mouse_wheel_speed);
 953         LYXERR(Debug::SCROLLING, "wheelScrollLines = " << lines
 954                         << " delta = " << delta << " scroll_value = " << scroll_value
 955                         << " page_step = " << page_step);
 956         // Now scroll.
 957         verticalScrollBar()->setValue(verticalScrollBar()->value() - scroll_value);
 958
 959         ev->accept();
 960 }
 961
 962
 963 void GuiWorkArea::generateSyntheticMouseEvent()
 964 {
 965         int const e_y = d->synthetic_mouse_event_.cmd.y();
 966         int const wh = d->buffer_view_->workHeight();
 967         bool const up = e_y < 0;
 968         bool const down = e_y > wh;
 969
 970         // Set things off to generate the _next_ 'pseudo' event.
 971         int step = 50;
 972         if (d->synthetic_mouse_event_.restart_timeout) {
 973                 // This is some magic formulae to determine the speed
 974                 // of scrolling related to the position of the mouse.
 975                 int time = 200;
 976                 if (up || down) {
 977                         int dist = up ? -e_y : e_y - wh;
 978                         time = max(min(200, 250000 / (dist * dist)), 1) ;
 979
 980                         if (time < 40) {
 981                                 step = 80000 / (time * time);
 982                                 time = 40;
 983                         }
 984                 }
 985                 d->synthetic_mouse_event_.timeout.setTimeout(time);
 986                 d->synthetic_mouse_event_.timeout.start();
 987         }
 988
 989         // Can we scroll further ?
 990         int const value = verticalScrollBar()->value();
 991         if (value == verticalScrollBar()->maximum()
 992                   || value == verticalScrollBar()->minimum()) {
 993                 d->synthetic_mouse_event_.timeout.stop();
 994                 return;
 995         }
 996
 997         // Scroll
 998         if (step <= 2 * wh) {
 999                 d->buffer_view_->scroll(up ? -step : step);
1000                 d->buffer_view_->updateMetrics();
1001         } else {
1002                 d->buffer_view_->scrollDocView(value + (up ? -step : step), false);
1003         }
1004
1005         // In which paragraph do we have to set the cursor ?
1006         Cursor & cur = d->buffer_view_->cursor();
1007         // FIXME: we don't know how to handle math.
1008         Text * text = cur.text();
1009         if (!text)
1010                 return;
1011         TextMetrics const & tm = d->buffer_view_->textMetrics(text);
1012
1013         // Quit gracefully if there are no metrics, since otherwise next
1014         // line would crash (bug #10324).
1015         // This situation seems related to a (not yet understood) timing problem.
1016         if (tm.empty())
1017                 return;
1018
1019         pair<pit_type, const ParagraphMetrics *> pp = up ? tm.first() : tm.last();
1020         ParagraphMetrics const & pm = *pp.second;
1021         pit_type const pit = pp.first;
1022
1023         if (pm.rows().empty())
1024                 return;
1025
1026         // Find the row at which we set the cursor.
1027         RowList::const_iterator rit = pm.rows().begin();
1028         RowList::const_iterator rlast = pm.rows().end();
1029         int yy = pm.position() - pm.ascent();
1030         for (--rlast; rit != rlast; ++rit) {
1031                 int h = rit->height();
1032                 if ((up && yy + h > 0)
1033                           || (!up && yy + h > wh - defaultRowHeight()))
1034                         break;
1035                 yy += h;
1036         }
1037
1038         // Find the position of the cursor
1039         bool bound;
1040         int x = d->synthetic_mouse_event_.cmd.x();
1041         pos_type const pos = tm.getPosNearX(*rit, x, bound);
1042
1043         // Set the cursor
1044         cur.pit() = pit;
1045         cur.pos() = pos;
1046         cur.boundary(bound);
1047
1048         d->buffer_view_->buffer().changed(false);
1049         return;
1050 }
1051
1052
1053 void GuiWorkArea::keyPressEvent(QKeyEvent * ev)
1054 {
1055         // this is also called for ShortcutOverride events. In this case, one must
1056         // not act but simply accept the event explicitly.
1057         bool const act = (ev->type() != QEvent::ShortcutOverride);
1058
1059         // Do not process here some keys if dialog_mode_ is set
1060         if (d->dialog_mode_
1061                 && (ev->modifiers() == Qt::NoModifier
1062                     || ev->modifiers() == Qt::ShiftModifier)
1063                 && (ev->key() == Qt::Key_Escape
1064                     || ev->key() == Qt::Key_Enter
1065                     || ev->key() == Qt::Key_Return)
1066             ) {
1067                 ev->ignore();
1068                 return;
1069         }
1070
1071         // intercept some keys if completion popup is visible
1072         if (d->completer_->popupVisible()) {
1073                 switch (ev->key()) {
1074                 case Qt::Key_Enter:
1075                 case Qt::Key_Return:
1076                         if (act)
1077                                 d->completer_->activate();
1078                         ev->accept();
1079                         return;
1080                 }
1081         }
1082
1083         // do nothing if there are other events
1084         // (the auto repeated events come too fast)
1085         // it looks like this is only needed on X11
1086 #if defined(Q_WS_X11) || defined(QPA_XCB)
1087         // FIXME: this is a weird way to implement event compression. Also, this is
1088         // broken with IBus.
1089         if (act && qApp->hasPendingEvents() && ev->isAutoRepeat()) {
1090                 switch (ev->key()) {
1091                 case Qt::Key_PageDown:
1092                 case Qt::Key_PageUp:
1093                 case Qt::Key_Left:
1094                 case Qt::Key_Right:
1095                 case Qt::Key_Up:
1096                 case Qt::Key_Down:
1097                         LYXERR(Debug::KEY, "system is busy: scroll key event ignored");
1098                         ev->ignore();
1099                         return;
1100                 }
1101         }
1102 #endif
1103
1104         KeyModifier const m = q_key_state(ev->modifiers());
1105
1106         std::string str;
1107         if (m & ShiftModifier)
1108                 str += "Shift-";
1109         if (m & ControlModifier)
1110                 str += "Control-";
1111         if (m & AltModifier)
1112                 str += "Alt-";
1113         if (m & MetaModifier)
1114                 str += "Meta-";
1115
1116         if (act)
1117                 LYXERR(Debug::KEY, " count: " << ev->count() << " text: " << ev->text()
1118                        << " isAutoRepeat: " << ev->isAutoRepeat() << " key: " << ev->key()
1119                        << " keyState: " << str);
1120
1121         KeySymbol sym;
1122         setKeySymbol(&sym, ev);
1123         if (sym.isOK()) {
1124                 if (act) {
1125                         processKeySym(sym, m);
1126                         ev->accept();
1127                 } else
1128                         ev->setAccepted(queryKeySym(sym, m));
1129         } else {
1130                 ev->ignore();
1131         }
1132 }
1133
1134
1135 void GuiWorkArea::doubleClickTimeout()
1136 {
1137         d->dc_event_.active = false;
1138 }
1139
1140
1141 void GuiWorkArea::mouseDoubleClickEvent(QMouseEvent * ev)
1142 {
1143         d->dc_event_ = DoubleClick(ev);
1144         QTimer::singleShot(QApplication::doubleClickInterval(), this,
1145                         SLOT(doubleClickTimeout()));
1146         FuncRequest cmd(LFUN_MOUSE_DOUBLE, ev->x(), ev->y(),
1147                         q_button_state(ev->button()), q_key_state(ev->modifiers()));
1148         d->dispatch(cmd);
1149         ev->accept();
1150 }
1151
1152
1153 void GuiWorkArea::resizeEvent(QResizeEvent * ev)
1154 {
1155         QAbstractScrollArea::resizeEvent(ev);
1156         d->need_resize_ = true;
1157         ev->accept();
1158 }
1159
1160
1161 void GuiWorkArea::Private::update(int x, int y, int w, int h)
1162 {
1163         p->viewport()->update(x, y, w, h);
1164 }
1165
1166
1167 void GuiWorkArea::paintEvent(QPaintEvent * ev)
1168 {
1169         QRectF const rc = ev->rect();
1170         // LYXERR(Debug::PAINTING, "paintEvent begin: x: " << rc.x()
1171         //      << " y: " << rc.y() << " w: " << rc.width() << " h: " << rc.height());
1172
1173         if (d->needResize()) {
1174                 d->resetScreen();
1175                 d->resizeBufferView();
1176                 if (d->cursor_visible_) {
1177                         d->hideCursor();
1178                         d->showCursor();
1179                 }
1180         }
1181
1182         QPainter pain(viewport());
1183         double const pr = pixelRatio();
1184         QRectF const rcs = QRectF(rc.x() * pr, rc.y() * pr, rc.width() * pr, rc.height() * pr);
1185
1186         if (lyxrc.use_qimage) {
1187                 QImage const & image = static_cast<QImage const &>(*d->screen_);
1188                 pain.drawImage(rc, image, rcs);
1189         } else {
1190                 QPixmap const & pixmap = static_cast<QPixmap const &>(*d->screen_);
1191                 pain.drawPixmap(rc, pixmap, rcs);
1192         }
1193         d->cursor_->draw(pain);
1194         ev->accept();
1195 }
1196
1197
1198 void GuiWorkArea::Private::updateScreen()
1199 {
1200         GuiPainter pain(screen_, p->pixelRatio());
1201         buffer_view_->draw(pain);
1202 }
1203
1204
1205 void GuiWorkArea::Private::showCursor(int x, int y, int h,
1206         bool l_shape, bool rtl, bool completable)
1207 {
1208         if (schedule_redraw_) {
1209                 // This happens when a graphic conversion is finished. As we don't know
1210                 // the size of the new graphics, it's better the update everything.
1211                 // We can't use redraw() here because this would trigger a infinite
1212                 // recursive loop with showCursor().
1213                 buffer_view_->resize(p->viewport()->width(), p->viewport()->height());
1214                 updateScreen();
1215                 updateScrollbar();
1216                 p->viewport()->update(QRect(0, 0, p->viewport()->width(), p->viewport()->height()));
1217                 schedule_redraw_ = false;
1218                 // Show the cursor immediately after the update.
1219                 hideCursor();
1220                 p->toggleCursor();
1221                 return;
1222         }
1223
1224         cursor_->update(x, y, h, l_shape, rtl, completable);
1225         cursor_->show();
1226         p->viewport()->update(cursor_->rect());
1227 }
1228
1229
1230 void GuiWorkArea::Private::removeCursor()
1231 {
1232         cursor_->hide();
1233         //if (!qApp->focusWidget())
1234                 p->viewport()->update(cursor_->rect());
1235 }
1236
1237
1238 void GuiWorkArea::inputMethodEvent(QInputMethodEvent * e)
1239 {
1240         QString const & commit_string = e->commitString();
1241         docstring const & preedit_string
1242                 = qstring_to_ucs4(e->preeditString());
1243
1244         if (!commit_string.isEmpty()) {
1245
1246                 LYXERR(Debug::KEY, "preeditString: " << e->preeditString()
1247                         << " commitString: " << e->commitString());
1248
1249                 int key = 0;
1250
1251                 // FIXME Iwami 04/01/07: we should take care also of UTF16 surrogates here.
1252                 for (int i = 0; i != commit_string.size(); ++i) {
1253                         QKeyEvent ev(QEvent::KeyPress, key, Qt::NoModifier, commit_string[i]);
1254                         keyPressEvent(&ev);
1255                 }
1256         }
1257
1258         // Hide the cursor during the kana-kanji transformation.
1259         if (preedit_string.empty())
1260                 startBlinkingCursor();
1261         else
1262                 stopBlinkingCursor();
1263
1264         // last_width : for checking if last preedit string was/wasn't empty.
1265         // FIXME THREAD && FIXME
1266         // We could have more than one work area, right?
1267         static bool last_width = false;
1268         if (!last_width && preedit_string.empty()) {
1269                 // if last_width is last length of preedit string.
1270                 e->accept();
1271                 return;
1272         }
1273
1274         GuiPainter pain(d->screen_, pixelRatio());
1275         d->buffer_view_->updateMetrics();
1276         d->buffer_view_->draw(pain);
1277         // FIXME: shall we use real_current_font here? (see #10478)
1278         FontInfo font = d->buffer_view_->cursor().getFont().fontInfo();
1279         FontMetrics const & fm = theFontMetrics(font);
1280         int height = fm.maxHeight();
1281         int cur_x = d->cursor_->rect().left();
1282         int cur_y = d->cursor_->rect().bottom();
1283
1284         // redraw area of preedit string.
1285         update(0, cur_y - height, viewport()->width(),
1286                 (height + 1) * d->preedit_lines_);
1287
1288         if (preedit_string.empty()) {
1289                 last_width = false;
1290                 d->preedit_lines_ = 1;
1291                 e->accept();
1292                 return;
1293         }
1294         last_width = true;
1295
1296         // att : stores an IM attribute.
1297         QList<QInputMethodEvent::Attribute> const & att = e->attributes();
1298
1299         // get attributes of input method cursor.
1300         // cursor_pos : cursor position in preedit string.
1301         size_t cursor_pos = 0;
1302         bool cursor_is_visible = false;
1303         for (int i = 0; i != att.size(); ++i) {
1304                 if (att.at(i).type == QInputMethodEvent::Cursor) {
1305                         cursor_pos = att.at(i).start;
1306                         cursor_is_visible = att.at(i).length != 0;
1307                         break;
1308                 }
1309         }
1310
1311         size_t preedit_length = preedit_string.length();
1312
1313         // get position of selection in input method.
1314         // FIXME: isn't there a way to do this simplier?
1315         // rStart : cursor position in selected string in IM.
1316         size_t rStart = 0;
1317         // rLength : selected string length in IM.
1318         size_t rLength = 0;
1319         if (cursor_pos < preedit_length) {
1320                 for (int i = 0; i != att.size(); ++i) {
1321                         if (att.at(i).type == QInputMethodEvent::TextFormat) {
1322                                 if (att.at(i).start <= int(cursor_pos)
1323                                         && int(cursor_pos) < att.at(i).start + att.at(i).length) {
1324                                                 rStart = att.at(i).start;
1325                                                 rLength = att.at(i).length;
1326                                                 if (!cursor_is_visible)
1327                                                         cursor_pos += rLength;
1328                                                 break;
1329                                 }
1330                         }
1331                 }
1332         }
1333         else {
1334                 rStart = cursor_pos;
1335                 rLength = 0;
1336         }
1337
1338         int const right_margin = d->buffer_view_->rightMargin();
1339         Painter::preedit_style ps;
1340         // Most often there would be only one line:
1341         d->preedit_lines_ = 1;
1342         for (size_t pos = 0; pos != preedit_length; ++pos) {
1343                 char_type const typed_char = preedit_string[pos];
1344                 // reset preedit string style
1345                 ps = Painter::preedit_default;
1346
1347                 // if we reached the right extremity of the screen, go to next line.
1348                 if (cur_x + fm.width(typed_char) > viewport()->width() - right_margin) {
1349                         cur_x = right_margin;
1350                         cur_y += height + 1;
1351                         ++d->preedit_lines_;
1352                 }
1353                 // preedit strings are displayed with dashed underline
1354                 // and partial strings are displayed white on black indicating
1355                 // that we are in selecting mode in the input method.
1356                 // FIXME: rLength == preedit_length is not a changing condition
1357                 // FIXME: should be put out of the loop.
1358                 if (pos >= rStart
1359                         && pos < rStart + rLength
1360                         && !(cursor_pos < rLength && rLength == preedit_length))
1361                         ps = Painter::preedit_selecting;
1362
1363                 if (pos == cursor_pos
1364                         && (cursor_pos < rLength && rLength == preedit_length))
1365                         ps = Painter::preedit_cursor;
1366
1367                 // draw one character and update cur_x.
1368                 cur_x += pain.preeditText(cur_x, cur_y, typed_char, font, ps);
1369         }
1370
1371         // update the preedit string screen area.
1372         update(0, cur_y - d->preedit_lines_*height, viewport()->width(),
1373                 (height + 1) * d->preedit_lines_);
1374
1375         // Don't forget to accept the event!
1376         e->accept();
1377 }
1378
1379
1380 QVariant GuiWorkArea::inputMethodQuery(Qt::InputMethodQuery query) const
1381 {
1382         QRect cur_r(0, 0, 0, 0);
1383         switch (query) {
1384                 // this is the CJK-specific composition window position and
1385                 // the context menu position when the menu key is pressed.
1386                 case Qt::ImMicroFocus:
1387                         cur_r = d->cursor_->rect();
1388                         if (d->preedit_lines_ != 1)
1389                                 cur_r.moveLeft(10);
1390                         cur_r.moveBottom(cur_r.bottom()
1391                                 + cur_r.height() * (d->preedit_lines_ - 1));
1392                         // return lower right of cursor in LyX.
1393                         return cur_r;
1394                 default:
1395                         return QWidget::inputMethodQuery(query);
1396         }
1397 }
1398
1399
1400 void GuiWorkArea::updateWindowTitle()
1401 {
1402         Buffer const & buf = bufferView().buffer();
1403         if (buf.fileName() != d->file_name_
1404             || buf.hasReadonlyFlag() != d->read_only_
1405             || buf.lyxvc().vcstatus() != d->vc_status_
1406             || buf.isClean() != d->clean_
1407             || buf.notifiesExternalModification() != d->externally_modified_) {
1408                 d->file_name_ = buf.fileName();
1409                 d->read_only_ = buf.hasReadonlyFlag();
1410                 d->vc_status_ = buf.lyxvc().vcstatus();
1411                 d->clean_ = buf.isClean();
1412                 d->externally_modified_ = buf.notifiesExternalModification();
1413                 Q_EMIT titleChanged(this);
1414         }
1415 }
1416
1417
1418 bool GuiWorkArea::isFullScreen() const
1419 {
1420         return d->lyx_view_ && d->lyx_view_->isFullScreen();
1421 }
1422
1423
1424 void GuiWorkArea::scheduleRedraw()
1425 {
1426         d->schedule_redraw_ = true;
1427 }
1428
1429
1430 bool GuiWorkArea::inDialogMode() const
1431 {
1432         return d->dialog_mode_;
1433 }
1434
1435
1436 void GuiWorkArea::setDialogMode(bool mode)
1437 {
1438         d->dialog_mode_ = mode;
1439 }
1440
1441
1442 GuiCompleter & GuiWorkArea::completer()
1443 {
1444         return *d->completer_;
1445 }
1446
1447 GuiView const & GuiWorkArea::view() const
1448 {
1449         return *d->lyx_view_;
1450 }
1451
1452
1453 GuiView & GuiWorkArea::view()
1454 {
1455         return *d->lyx_view_;
1456 }
1457
1458 ////////////////////////////////////////////////////////////////////
1459 //
1460 // EmbeddedWorkArea
1461 //
1462 ////////////////////////////////////////////////////////////////////
1463
1464
1465 EmbeddedWorkArea::EmbeddedWorkArea(QWidget * w): GuiWorkArea(w)
1466 {
1467         support::TempFile tempfile("embedded.internal");
1468         tempfile.setAutoRemove(false);
1469         buffer_ = theBufferList().newInternalBuffer(tempfile.name().absFileName());
1470         buffer_->setUnnamed(true);
1471         buffer_->setFullyLoaded(true);
1472         setBuffer(*buffer_);
1473         setDialogMode(true);
1474 }
1475
1476
1477 EmbeddedWorkArea::~EmbeddedWorkArea()
1478 {
1479         // No need to destroy buffer and bufferview here, because it is done
1480         // in theBufferList() destruction loop at application exit
1481 }
1482
1483
1484 void EmbeddedWorkArea::closeEvent(QCloseEvent * ev)
1485 {
1486         disable();
1487         GuiWorkArea::closeEvent(ev);
1488 }
1489
1490
1491 void EmbeddedWorkArea::hideEvent(QHideEvent * ev)
1492 {
1493         disable();
1494         GuiWorkArea::hideEvent(ev);
1495 }
1496
1497
1498 QSize EmbeddedWorkArea::sizeHint () const
1499 {
1500         // FIXME(?):
1501         // GuiWorkArea sets the size to the screen's viewport
1502         // by returning a value this gets overridden
1503         // EmbeddedWorkArea is now sized to fit in the layout
1504         // of the parent, and has a minimum size set in GuiWorkArea
1505         // which is what we return here
1506         return QSize(100, 70);
1507 }
1508
1509
1510 void EmbeddedWorkArea::disable()
1511 {
1512         stopBlinkingCursor();
1513         if (view().currentWorkArea() != this)
1514                 return;
1515         // No problem if currentMainWorkArea() is 0 (setCurrentWorkArea()
1516         // tolerates it and shows the background logo), what happens if
1517         // an EmbeddedWorkArea is closed after closing all document WAs
1518         view().setCurrentWorkArea(view().currentMainWorkArea());
1519 }
1520
1521 ////////////////////////////////////////////////////////////////////
1522 //
1523 // TabWorkArea
1524 //
1525 ////////////////////////////////////////////////////////////////////
1526
1527 #ifdef Q_OS_MAC
1528 class NoTabFrameMacStyle : public QProxyStyle {
1529 public:
1530         ///
1531         QRect subElementRect(SubElement element, const QStyleOption * option,
1532                              const QWidget * widget = 0) const
1533         {
1534                 QRect rect = QProxyStyle::subElementRect(element, option, widget);
1535                 bool noBar = static_cast<QTabWidget const *>(widget)->count() <= 1;
1536
1537                 // The Qt Mac style puts the contents into a 3 pixel wide box
1538                 // which looks very ugly and not like other Mac applications.
1539                 // Hence we remove this here, and moreover the 16 pixel round
1540                 // frame above if the tab bar is hidden.
1541                 if (element == QStyle::SE_TabWidgetTabContents) {
1542                         rect.adjust(- rect.left(), 0, rect.left(), 0);
1543                         if (noBar)
1544                                 rect.setTop(0);
1545                 }
1546
1547                 return rect;
1548         }
1549 };
1550
1551 NoTabFrameMacStyle noTabFrameMacStyle;
1552 #endif
1553
1554
1555 TabWorkArea::TabWorkArea(QWidget * parent)
1556         : QTabWidget(parent), clicked_tab_(-1), midpressed_tab_(-1)
1557 {
1558 #ifdef Q_OS_MAC
1559         setStyle(&noTabFrameMacStyle);
1560 #endif
1561
1562         QPalette pal = palette();
1563         pal.setColor(QPalette::Active, QPalette::Button,
1564                 pal.color(QPalette::Active, QPalette::Window));
1565         pal.setColor(QPalette::Disabled, QPalette::Button,
1566                 pal.color(QPalette::Disabled, QPalette::Window));
1567         pal.setColor(QPalette::Inactive, QPalette::Button,
1568                 pal.color(QPalette::Inactive, QPalette::Window));
1569
1570         QObject::connect(this, SIGNAL(currentChanged(int)),
1571                 this, SLOT(on_currentTabChanged(int)));
1572
1573         closeBufferButton = new QToolButton(this);
1574         closeBufferButton->setPalette(pal);
1575         // FIXME: rename the icon to closebuffer.png
1576         closeBufferButton->setIcon(QIcon(getPixmap("images/", "closetab", "svgz,png")));
1577         closeBufferButton->setText("Close File");
1578         closeBufferButton->setAutoRaise(true);
1579         closeBufferButton->setCursor(Qt::ArrowCursor);
1580         closeBufferButton->setToolTip(qt_("Close File"));
1581         closeBufferButton->setEnabled(true);
1582         QObject::connect(closeBufferButton, SIGNAL(clicked()),
1583                 this, SLOT(closeCurrentBuffer()));
1584         setCornerWidget(closeBufferButton, Qt::TopRightCorner);
1585
1586         // setup drag'n'drop
1587         QTabBar* tb = new DragTabBar;
1588         connect(tb, SIGNAL(tabMoveRequested(int, int)),
1589                 this, SLOT(moveTab(int, int)));
1590         tb->setElideMode(Qt::ElideNone);
1591         setTabBar(tb);
1592
1593         // make us responsible for the context menu of the tabbar
1594         tb->setContextMenuPolicy(Qt::CustomContextMenu);
1595         connect(tb, SIGNAL(customContextMenuRequested(const QPoint &)),
1596                 this, SLOT(showContextMenu(const QPoint &)));
1597         connect(tb, SIGNAL(tabCloseRequested(int)),
1598                 this, SLOT(closeTab(int)));
1599
1600         setUsesScrollButtons(true);
1601 }
1602
1603
1604 void TabWorkArea::mousePressEvent(QMouseEvent *me)
1605 {
1606         if (me->button() == Qt::MidButton)
1607                 midpressed_tab_ = tabBar()->tabAt(me->pos());
1608         else
1609                 QTabWidget::mousePressEvent(me);
1610 }
1611
1612
1613 void TabWorkArea::mouseReleaseEvent(QMouseEvent *me)
1614 {
1615         if (me->button() == Qt::MidButton) {
1616                 int const midreleased_tab = tabBar()->tabAt(me->pos());
1617                 if (midpressed_tab_ == midreleased_tab && posIsTab(me->pos()))
1618                         closeTab(midreleased_tab);
1619         } else
1620                 QTabWidget::mouseReleaseEvent(me);
1621 }
1622
1623
1624 void TabWorkArea::paintEvent(QPaintEvent * event)
1625 {
1626         if (tabBar()->isVisible()) {
1627                 QTabWidget::paintEvent(event);
1628         } else {
1629                 // Prevent the selected tab to influence the
1630                 // painting of the frame of the tab widget.
1631                 // This is needed for gtk style in Qt.
1632                 QStylePainter p(this);
1633 #if QT_VERSION < 0x050000
1634                 QStyleOptionTabWidgetFrameV2 opt;
1635 #else
1636                 QStyleOptionTabWidgetFrame opt;
1637 #endif
1638                 initStyleOption(&opt);
1639                 opt.rect = style()->subElementRect(QStyle::SE_TabWidgetTabPane,
1640                         &opt, this);
1641                 opt.selectedTabRect = QRect();
1642                 p.drawPrimitive(QStyle::PE_FrameTabWidget, opt);
1643         }
1644 }
1645
1646
1647 bool TabWorkArea::posIsTab(QPoint position)
1648 {
1649         // tabAt returns -1 if tab does not covers position
1650         return tabBar()->tabAt(position) > -1;
1651 }
1652
1653
1654 void TabWorkArea::mouseDoubleClickEvent(QMouseEvent * event)
1655 {
1656         if (event->button() != Qt::LeftButton)
1657                 return;
1658
1659         // this code chunk is unnecessary because it seems the event only makes
1660         // it this far if it is not on a tab. I'm not sure why this is (maybe
1661         // it is handled and ended in DragTabBar?), and thus I'm not sure if
1662         // this is true in all cases and if it will be true in the future so I
1663         // leave this code for now. (skostysh, 2016-07-21)
1664         //
1665         // return early if double click on existing tabs
1666         if (posIsTab(event->pos()))
1667                 return;
1668
1669         dispatch(FuncRequest(LFUN_BUFFER_NEW));
1670 }
1671
1672
1673 void TabWorkArea::setFullScreen(bool full_screen)
1674 {
1675         for (int i = 0; i != count(); ++i) {
1676                 if (GuiWorkArea * wa = workArea(i))
1677                         wa->setFullScreen(full_screen);
1678         }
1679
1680         if (lyxrc.full_screen_tabbar)
1681                 showBar(!full_screen && count() > 1);
1682         else
1683                 showBar(count() > 1);
1684 }
1685
1686
1687 void TabWorkArea::showBar(bool show)
1688 {
1689         tabBar()->setEnabled(show);
1690         tabBar()->setVisible(show);
1691         closeBufferButton->setVisible(show && lyxrc.single_close_tab_button);
1692         setTabsClosable(!lyxrc.single_close_tab_button);
1693 }
1694
1695
1696 GuiWorkAreaContainer * TabWorkArea::widget(int index) const
1697 {
1698         QWidget * w = QTabWidget::widget(index);
1699         if (!w)
1700                 return nullptr;
1701         GuiWorkAreaContainer * wac = dynamic_cast<GuiWorkAreaContainer *>(w);
1702         LATTEST(wac);
1703         return wac;
1704 }
1705
1706
1707 GuiWorkAreaContainer * TabWorkArea::currentWidget() const
1708 {
1709         return widget(currentIndex());
1710 }
1711
1712
1713 GuiWorkArea * TabWorkArea::workArea(int index) const
1714 {
1715         GuiWorkAreaContainer * w = widget(index);
1716         if (!w)
1717                 return nullptr;
1718         return w->workArea();
1719 }
1720
1721
1722 GuiWorkArea * TabWorkArea::currentWorkArea() const
1723 {
1724         return workArea(currentIndex());
1725 }
1726
1727
1728 GuiWorkArea * TabWorkArea::workArea(Buffer & buffer) const
1729 {
1730         // FIXME: this method doesn't work if we have more than one work area
1731         // showing the same buffer.
1732         for (int i = 0; i != count(); ++i) {
1733                 GuiWorkArea * wa = workArea(i);
1734                 LASSERT(wa, return 0);
1735                 if (&wa->bufferView().buffer() == &buffer)
1736                         return wa;
1737         }
1738         return 0;
1739 }
1740
1741
1742 void TabWorkArea::closeAll()
1743 {
1744         while (count()) {
1745                 QWidget * wac = widget(0);
1746                 LASSERT(wac, return);
1747                 removeTab(0);
1748                 delete wac;
1749         }
1750 }
1751
1752
1753 int TabWorkArea::indexOfWorkArea(GuiWorkArea * w) const
1754 {
1755         for (int index = 0; index < count(); ++index)
1756                 if (workArea(index) == w)
1757                         return index;
1758         return -1;
1759 }
1760
1761
1762 bool TabWorkArea::setCurrentWorkArea(GuiWorkArea * work_area)
1763 {
1764         LASSERT(work_area, return false);
1765         int index = indexOfWorkArea(work_area);
1766         if (index == -1)
1767                 return false;
1768
1769         if (index == currentIndex())
1770                 // Make sure the work area is up to date.
1771                 on_currentTabChanged(index);
1772         else
1773                 // Switch to the work area.
1774                 setCurrentIndex(index);
1775         work_area->setFocus();
1776
1777         return true;
1778 }
1779
1780
1781 GuiWorkArea * TabWorkArea::addWorkArea(Buffer & buffer, GuiView & view)
1782 {
1783         GuiWorkArea * wa = new GuiWorkArea(buffer, view);
1784         GuiWorkAreaContainer * wac = new GuiWorkAreaContainer(wa);
1785         wa->setUpdatesEnabled(false);
1786         // Hide tabbar if there's no tab (avoid a resize and a flashing tabbar
1787         // when hiding it again below).
1788         if (!(currentWorkArea() && currentWorkArea()->isFullScreen()))
1789                 showBar(count() > 0);
1790         addTab(wac, wa->windowTitle());
1791         QObject::connect(wa, SIGNAL(titleChanged(GuiWorkArea *)),
1792                 this, SLOT(updateTabTexts()));
1793         if (currentWorkArea() && currentWorkArea()->isFullScreen())
1794                 setFullScreen(true);
1795         else
1796                 // Hide tabbar if there's only one tab.
1797                 showBar(count() > 1);
1798
1799         updateTabTexts();
1800
1801         return wa;
1802 }
1803
1804
1805 bool TabWorkArea::removeWorkArea(GuiWorkArea * work_area)
1806 {
1807         LASSERT(work_area, return false);
1808         int index = indexOfWorkArea(work_area);
1809         if (index == -1)
1810                 return false;
1811
1812         work_area->setUpdatesEnabled(false);
1813         QWidget * wac = widget(index);
1814         removeTab(index);
1815         delete wac;
1816
1817         if (count()) {
1818                 // make sure the next work area is enabled.
1819                 currentWidget()->setUpdatesEnabled(true);
1820                 if (currentWorkArea() && currentWorkArea()->isFullScreen())
1821                         setFullScreen(true);
1822                 else
1823                         // Show tabbar only if there's more than one tab.
1824                         showBar(count() > 1);
1825         } else
1826                 lastWorkAreaRemoved();
1827
1828         updateTabTexts();
1829
1830         return true;
1831 }
1832
1833
1834 void TabWorkArea::on_currentTabChanged(int i)
1835 {
1836         // returns e.g. on application destruction
1837         if (i == -1)
1838                 return;
1839         GuiWorkArea * wa = workArea(i);
1840         LASSERT(wa, return);
1841         wa->setUpdatesEnabled(true);
1842         wa->redraw(true);
1843         wa->setFocus();
1844         ///
1845         currentWorkAreaChanged(wa);
1846
1847         LYXERR(Debug::GUI, "currentTabChanged " << i
1848                 << " File: " << wa->bufferView().buffer().absFileName());
1849 }
1850
1851
1852 void TabWorkArea::closeCurrentBuffer()
1853 {
1854         GuiWorkArea * wa;
1855         if (clicked_tab_ == -1)
1856                 wa = currentWorkArea();
1857         else {
1858                 wa = workArea(clicked_tab_);
1859                 LASSERT(wa, return);
1860         }
1861         wa->view().closeWorkArea(wa);
1862 }
1863
1864
1865 void TabWorkArea::hideCurrentTab()
1866 {
1867         GuiWorkArea * wa;
1868         if (clicked_tab_ == -1)
1869                 wa = currentWorkArea();
1870         else {
1871                 wa = workArea(clicked_tab_);
1872                 LASSERT(wa, return);
1873         }
1874         wa->view().hideWorkArea(wa);
1875 }
1876
1877
1878 void TabWorkArea::closeTab(int index)
1879 {
1880         on_currentTabChanged(index);
1881         GuiWorkArea * wa;
1882         if (index == -1)
1883                 wa = currentWorkArea();
1884         else {
1885                 wa = workArea(index);
1886                 LASSERT(wa, return);
1887         }
1888         wa->view().closeWorkArea(wa);
1889 }
1890
1891
1892 ///
1893 class DisplayPath {
1894 public:
1895         /// make vector happy
1896         DisplayPath() : tab_(-1), dottedPrefix_(false) {}
1897         ///
1898         DisplayPath(int tab, FileName const & filename)
1899                 : tab_(tab)
1900         {
1901                 filename_ = (filename.extension() == "lyx") ?
1902                         toqstr(filename.onlyFileNameWithoutExt())
1903                         : toqstr(filename.onlyFileName());
1904                 postfix_ = toqstr(filename.absoluteFilePath()).
1905                         split("/", QString::SkipEmptyParts);
1906                 postfix_.pop_back();
1907                 abs_ = toqstr(filename.absoluteFilePath());
1908                 dottedPrefix_ = false;
1909         }
1910
1911         /// Absolute path for debugging.
1912         QString abs() const
1913         {
1914                 return abs_;
1915         }
1916         /// Add the first segment from the postfix or three dots to the prefix.
1917         /// Merge multiple dot tripples. In fact dots are added lazily, i.e. only
1918         /// when really needed.
1919         void shiftPathSegment(bool dotted)
1920         {
1921                 if (postfix_.count() <= 0)
1922                         return;
1923
1924                 if (!dotted) {
1925                         if (dottedPrefix_ && !prefix_.isEmpty())
1926                                 prefix_ += ellipsisSlash_;
1927                         prefix_ += postfix_.front() + "/";
1928                 }
1929                 dottedPrefix_ = dotted && !prefix_.isEmpty();
1930                 postfix_.pop_front();
1931         }
1932         ///
1933         QString displayString() const
1934         {
1935                 if (prefix_.isEmpty())
1936                         return filename_;
1937
1938                 bool dots = dottedPrefix_ || !postfix_.isEmpty();
1939                 return prefix_ + (dots ? ellipsisSlash_ : "") + filename_;
1940         }
1941         ///
1942         QString forecastPathString() const
1943         {
1944                 if (postfix_.count() == 0)
1945                         return displayString();
1946
1947                 return prefix_
1948                         + (dottedPrefix_ ? ellipsisSlash_ : "")
1949                         + postfix_.front() + "/";
1950         }
1951         ///
1952         bool final() const { return postfix_.empty(); }
1953         ///
1954         int tab() const { return tab_; }
1955
1956 private:
1957         /// ".../"
1958         static QString const ellipsisSlash_;
1959         ///
1960         QString prefix_;
1961         ///
1962         QStringList postfix_;
1963         ///
1964         QString filename_;
1965         ///
1966         QString abs_;
1967         ///
1968         int tab_;
1969         ///
1970         bool dottedPrefix_;
1971 };
1972
1973
1974 QString const DisplayPath::ellipsisSlash_ = QString(QChar(0x2026)) + "/";
1975
1976
1977 ///
1978 bool operator<(DisplayPath const & a, DisplayPath const & b)
1979 {
1980         return a.displayString() < b.displayString();
1981 }
1982
1983 ///
1984 bool operator==(DisplayPath const & a, DisplayPath const & b)
1985 {
1986         return a.displayString() == b.displayString();
1987 }
1988
1989
1990 void TabWorkArea::updateTabTexts()
1991 {
1992         size_t n = count();
1993         if (n == 0)
1994                 return;
1995         std::list<DisplayPath> paths;
1996         typedef std::list<DisplayPath>::iterator It;
1997
1998         // collect full names first: path into postfix, empty prefix and
1999         // filename without extension
2000         for (size_t i = 0; i < n; ++i) {
2001                 GuiWorkArea * i_wa = workArea(i);
2002                 FileName const fn = i_wa->bufferView().buffer().fileName();
2003                 paths.push_back(DisplayPath(i, fn));
2004         }
2005
2006         // go through path segments and see if it helps to make the path more unique
2007         bool somethingChanged = true;
2008         bool allFinal = false;
2009         while (somethingChanged && !allFinal) {
2010                 // adding path segments changes order
2011                 paths.sort();
2012
2013                 LYXERR(Debug::GUI, "updateTabTexts() iteration start");
2014                 somethingChanged = false;
2015                 allFinal = true;
2016
2017                 // find segments which are not unique (i.e. non-atomic)
2018                 It it = paths.begin();
2019                 It segStart = it;
2020                 QString segString = it->displayString();
2021                 for (; it != paths.end(); ++it) {
2022                         // look to the next item
2023                         It next = it;
2024                         ++next;
2025
2026                         // final?
2027                         allFinal = allFinal && it->final();
2028
2029                         LYXERR(Debug::GUI, "it = " << it->abs()
2030                                << " => " << it->displayString());
2031
2032                         // still the same segment?
2033                         QString nextString;
2034                         if ((next != paths.end()
2035                              && (nextString = next->displayString()) == segString))
2036                                 continue;
2037                         LYXERR(Debug::GUI, "segment ended");
2038
2039                         // only a trivial one with one element?
2040                         if (it == segStart) {
2041                                 // start new segment
2042                                 segStart = next;
2043                                 segString = nextString;
2044                                 continue;
2045                         }
2046
2047                         // We found a non-atomic segment
2048                         // We know that segStart <= it < next <= paths.end().
2049                         // The assertion below tells coverity about it.
2050                         LATTEST(segStart != paths.end());
2051                         QString dspString = segStart->forecastPathString();
2052                         LYXERR(Debug::GUI, "first forecast found for "
2053                                << segStart->abs() << " => " << dspString);
2054                         It sit = segStart;
2055                         ++sit;
2056                         // Shift path segments and hope for the best
2057                         // that it makes the path more unique.
2058                         somethingChanged = true;
2059                         bool moreUnique = false;
2060                         for (; sit != next; ++sit) {
2061                                 if (sit->forecastPathString() != dspString) {
2062                                         LYXERR(Debug::GUI, "different forecast found for "
2063                                                 << sit->abs() << " => " << sit->forecastPathString());
2064                                         moreUnique = true;
2065                                         break;
2066                                 }
2067                                 LYXERR(Debug::GUI, "same forecast found for "
2068                                         << sit->abs() << " => " << dspString);
2069                         }
2070
2071                         // if the path segment helped, add it. Otherwise add dots
2072                         bool dots = !moreUnique;
2073                         LYXERR(Debug::GUI, "using dots = " << dots);
2074                         for (sit = segStart; sit != next; ++sit) {
2075                                 sit->shiftPathSegment(dots);
2076                                 LYXERR(Debug::GUI, "shifting "
2077                                         << sit->abs() << " => " << sit->displayString());
2078                         }
2079
2080                         // start new segment
2081                         segStart = next;
2082                         segString = nextString;
2083                 }
2084         }
2085
2086         // set new tab titles
2087         for (It it = paths.begin(); it != paths.end(); ++it) {
2088                 int const tab_index = it->tab();
2089                 Buffer const & buf = workArea(tab_index)->bufferView().buffer();
2090                 QString tab_text = it->displayString().replace("&", "&&");
2091                 if (!buf.fileName().empty() && !buf.isClean())
2092                         tab_text += "*";
2093                 QString tab_tooltip = it->abs();
2094                 if (buf.hasReadonlyFlag()) {
2095                         setTabIcon(tab_index, QIcon(getPixmap("images/", "emblem-readonly", "svgz,png")));
2096                         tab_tooltip = qt_("%1 (read only)").arg(tab_tooltip);
2097                 } else
2098                         setTabIcon(tab_index, QIcon());
2099                 if (buf.notifiesExternalModification()) {
2100                         QString const warn = qt_("%1 (modified externally)");
2101                         tab_tooltip = warn.arg(tab_tooltip);
2102                         tab_text += QChar(0x26a0);
2103                 }
2104                 setTabText(tab_index, tab_text);
2105                 setTabToolTip(tab_index, tab_tooltip);
2106         }
2107 }
2108
2109
2110 void TabWorkArea::showContextMenu(const QPoint & pos)
2111 {
2112         // which tab?
2113         clicked_tab_ = static_cast<DragTabBar *>(tabBar())->tabAt(pos);
2114         if (clicked_tab_ == -1)
2115                 return;
2116
2117         // show tab popup
2118         QMenu popup;
2119         popup.addAction(QIcon(getPixmap("images/", "hidetab", "svgz,png")),
2120                 qt_("Hide tab"), this, SLOT(hideCurrentTab()));
2121         popup.addAction(QIcon(getPixmap("images/", "closetab", "svgz,png")),
2122                 qt_("Close tab"), this, SLOT(closeCurrentBuffer()));
2123         popup.exec(tabBar()->mapToGlobal(pos));
2124
2125         clicked_tab_ = -1;
2126 }
2127
2128
2129 void TabWorkArea::moveTab(int fromIndex, int toIndex)
2130 {
2131         QWidget * w = widget(fromIndex);
2132         QIcon icon = tabIcon(fromIndex);
2133         QString text = tabText(fromIndex);
2134
2135         setCurrentIndex(fromIndex);
2136         removeTab(fromIndex);
2137         insertTab(toIndex, w, icon, text);
2138         setCurrentIndex(toIndex);
2139 }
2140
2141
2142 DragTabBar::DragTabBar(QWidget* parent)
2143         : QTabBar(parent)
2144 {
2145         setAcceptDrops(true);
2146         setTabsClosable(!lyxrc.single_close_tab_button);
2147 }
2148
2149
2150 void DragTabBar::mousePressEvent(QMouseEvent * event)
2151 {
2152         if (event->button() == Qt::LeftButton)
2153                 dragStartPos_ = event->pos();
2154         QTabBar::mousePressEvent(event);
2155 }
2156
2157
2158 void DragTabBar::mouseMoveEvent(QMouseEvent * event)
2159 {
2160         // If the left button isn't pressed anymore then return
2161         if (!(event->buttons() & Qt::LeftButton))
2162                 return;
2163
2164         // If the distance is too small then return
2165         if ((event->pos() - dragStartPos_).manhattanLength()
2166             < QApplication::startDragDistance())
2167                 return;
2168
2169         // did we hit something after all?
2170         int tab = tabAt(dragStartPos_);
2171         if (tab == -1)
2172                 return;
2173
2174         // simulate button release to remove highlight from button
2175         int i = currentIndex();
2176         QMouseEvent me(QEvent::MouseButtonRelease, dragStartPos_,
2177                 event->button(), event->buttons(), 0);
2178         QTabBar::mouseReleaseEvent(&me);
2179         setCurrentIndex(i);
2180
2181         // initiate Drag
2182         QDrag * drag = new QDrag(this);
2183         QMimeData * mimeData = new QMimeData;
2184         // a crude way to distinguish tab-reodering drops from other ones
2185         mimeData->setData("action", "tab-reordering") ;
2186         drag->setMimeData(mimeData);
2187
2188         // get tab pixmap as cursor
2189         QRect r = tabRect(tab);
2190         QPixmap pixmap(r.size());
2191         render(&pixmap, - r.topLeft());
2192         drag->setPixmap(pixmap);
2193         drag->exec();
2194 }
2195
2196
2197 void DragTabBar::dragEnterEvent(QDragEnterEvent * event)
2198 {
2199         // Only accept if it's an tab-reordering request
2200         QMimeData const * m = event->mimeData();
2201         QStringList formats = m->formats();
2202         if (formats.contains("action")
2203             && m->data("action") == "tab-reordering")
2204                 event->acceptProposedAction();
2205 }
2206
2207
2208 void DragTabBar::dropEvent(QDropEvent * event)
2209 {
2210         int fromIndex = tabAt(dragStartPos_);
2211         int toIndex = tabAt(event->pos());
2212
2213         // Tell interested objects that
2214         if (fromIndex != toIndex)
2215                 tabMoveRequested(fromIndex, toIndex);
2216         event->acceptProposedAction();
2217 }
2218
2219
2220 GuiWorkAreaContainer::GuiWorkAreaContainer(GuiWorkArea * wa, QWidget * parent)
2221         : QWidget(parent), wa_(wa)
2222 {
2223         LASSERT(wa, return);
2224         Ui::WorkAreaUi::setupUi(this);
2225         layout()->addWidget(wa);
2226         connect(wa, SIGNAL(titleChanged(GuiWorkArea *)),
2227                 this, SLOT(updateDisplay()));
2228         connect(reloadPB, SIGNAL(clicked()), this, SLOT(reload()));
2229         connect(ignorePB, SIGNAL(clicked()), this, SLOT(ignore()));
2230         setMessageColour({notificationFrame}, {reloadPB, ignorePB});
2231         updateDisplay();
2232 }
2233
2234
2235 void GuiWorkAreaContainer::updateDisplay()
2236 {
2237         Buffer const & buf = wa_->bufferView().buffer();
2238         notificationFrame->setHidden(!buf.notifiesExternalModification());
2239         QString const label = qt_("<b>The file %1 changed on disk.</b>")
2240                 .arg(toqstr(buf.fileName().displayName()));
2241         externalModificationLabel->setText(label);
2242 }
2243
2244
2245 void GuiWorkAreaContainer::dispatch(FuncRequest f) const
2246 {
2247         lyx::dispatch(FuncRequest(LFUN_BUFFER_SWITCH,
2248                                   wa_->bufferView().buffer().absFileName()));
2249         lyx::dispatch(f);
2250 }
2251
2252
2253 void GuiWorkAreaContainer::reload() const
2254 {
2255         dispatch(FuncRequest(LFUN_BUFFER_RELOAD));
2256 }
2257
2258
2259 void GuiWorkAreaContainer::ignore() const
2260 {
2261         dispatch(FuncRequest(LFUN_BUFFER_EXTERNAL_MODIFICATION_CLEAR));
2262 }
2263
2264
2265 void GuiWorkAreaContainer::mouseDoubleClickEvent(QMouseEvent * event)
2266 {
2267         // prevent TabWorkArea from opening a new buffer on double click
2268         event->accept();
2269 }
2270
2271
2272 } // namespace frontend
2273 } // namespace lyx
2274
2275 #include "moc_GuiWorkArea.cpp"