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 "GuiApplication.h"
  20 #include "GuiCompleter.h"
  21 #include "GuiKeySymbol.h"
  22 #include "GuiPainter.h"
  23 #include "GuiView.h"
  24 #include "Menus.h"
  25 #include "qt_helpers.h"
  26
  27 #include "Buffer.h"
  28 #include "BufferList.h"
  29 #include "BufferParams.h"
  30 #include "BufferView.h"
  31 #include "CoordCache.h"
  32 #include "Cursor.h"
  33 #include "Font.h"
  34 #include "FuncRequest.h"
  35 #include "KeySymbol.h"
  36 #include "Language.h"
  37 #include "LyX.h"
  38 #include "LyXRC.h"
  39 #include "LyXVC.h"
  40 #include "Text.h"
  41 #include "TextMetrics.h"
  42 #include "Undo.h"
  43 #include "version.h"
  44
  45 #include "graphics/GraphicsImage.h"
  46 #include "graphics/GraphicsLoader.h"
  47
  48 #include "support/convert.h"
  49 #include "support/debug.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 <QScrollBar>
  72 #include <QStyleOption>
  73 #include <QStylePainter>
  74 #include <QTimer>
  75 #include <QToolButton>
  76 #include <QToolTip>
  77 #include <QMenuBar>
  78
  79 #include <cmath>
  80 #include <iostream>
  81
  82 int const TabIndicatorWidth = 3;
  83
  84 #undef KeyPress
  85 #undef NoModifier
  86
  87 using namespace std;
  88 using namespace lyx::support;
  89
  90 namespace lyx {
  91
  92
  93 /// return the LyX mouse button state from Qt's
  94 static mouse_button::state q_button_state(Qt::MouseButton button)
  95 {
  96         mouse_button::state b = mouse_button::none;
  97         switch (button) {
  98                 case Qt::LeftButton:
  99                         b = mouse_button::button1;
 100                         break;
 101                 case Qt::MidButton:
 102                         b = mouse_button::button2;
 103                         break;
 104                 case Qt::RightButton:
 105                         b = mouse_button::button3;
 106                         break;
 107                 default:
 108                         break;
 109         }
 110         return b;
 111 }
 112
 113
 114 /// return the LyX mouse button state from Qt's
 115 mouse_button::state q_motion_state(Qt::MouseButtons state)
 116 {
 117         mouse_button::state b = mouse_button::none;
 118         if (state & Qt::LeftButton)
 119                 b |= mouse_button::button1;
 120         if (state & Qt::MidButton)
 121                 b |= mouse_button::button2;
 122         if (state & Qt::RightButton)
 123                 b |= mouse_button::button3;
 124         return b;
 125 }
 126
 127
 128 namespace frontend {
 129
 130 class CaretWidget {
 131 public:
 132         CaretWidget() : rtl_(false), l_shape_(false), completable_(false),
 133                 x_(0), caret_width_(0)
 134         {}
 135
 136         /* Draw the caret. Parameter \c horiz_offset is not 0 when there
 137          * has been horizontal scrolling in current row
 138          */
 139         void draw(QPainter & painter, int horiz_offset)
 140         {
 141                 if (!rect_.isValid())
 142                         return;
 143
 144                 int const x = x_ - horiz_offset;
 145                 int const y = rect_.top();
 146                 int const l = x_ - rect_.left();
 147                 int const r = rect_.right() - x_;
 148                 int const bot = rect_.bottom();
 149
 150                 // draw vertical line
 151                 painter.fillRect(x, y, caret_width_, rect_.height(), color_);
 152
 153                 // draw RTL/LTR indication
 154                 painter.setPen(color_);
 155                 if (l_shape_) {
 156                         if (rtl_)
 157                                 painter.drawLine(x, bot, x - l, bot);
 158                         else
 159                                 painter.drawLine(x, bot, x + caret_width_ + r, bot);
 160                 }
 161
 162                 // draw completion triangle
 163                 if (completable_) {
 164                         int m = y + rect_.height() / 2;
 165                         int d = TabIndicatorWidth - 1;
 166                         if (rtl_) {
 167                                 painter.drawLine(x - 1, m - d, x - 1 - d, m);
 168                                 painter.drawLine(x - 1, m + d, x - 1 - d, m);
 169                         } else {
 170                                 painter.drawLine(x + caret_width_, m - d, x + caret_width_ + d, m);
 171                                 painter.drawLine(x + caret_width_, m + d, x + caret_width_ + d, m);
 172                         }
 173                 }
 174         }
 175
 176         void update(int x, int y, int h, bool l_shape,
 177                 bool rtl, bool completable)
 178         {
 179                 color_ = guiApp->colorCache().get(Color_cursor);
 180                 l_shape_ = l_shape;
 181                 rtl_ = rtl;
 182                 completable_ = completable;
 183                 x_ = x;
 184
 185                 // extension to left and right
 186                 int l = 0;
 187                 int r = 0;
 188
 189                 // RTL/LTR indication
 190                 if (l_shape_) {
 191                         if (rtl)
 192                                 l += h / 3;
 193                         else
 194                                 r += h / 3;
 195                 }
 196
 197                 // completion triangle
 198                 if (completable_) {
 199                         if (rtl)
 200                                 l = max(l, TabIndicatorWidth);
 201                         else
 202                                 r = max(r, TabIndicatorWidth);
 203                 }
 204
 205                 //FIXME: LyXRC::cursor_width should be caret_width
 206                 caret_width_ = lyxrc.cursor_width
 207                         ? lyxrc.cursor_width
 208                         : 1 + int((lyxrc.currentZoom + 50) / 200.0);
 209
 210                 // compute overall rectangle
 211                 rect_ = QRect(x - l, y, caret_width_ + r + l, h);
 212         }
 213
 214         QRect const & rect() { return rect_; }
 215
 216 private:
 217         /// caret is in RTL or LTR text
 218         bool rtl_;
 219         /// indication for RTL or LTR
 220         bool l_shape_;
 221         /// triangle to show that a completion is available
 222         bool completable_;
 223         ///
 224         QColor color_;
 225         /// rectangle, possibly with l_shape and completion triangle
 226         QRect rect_;
 227         /// x position (were the vertical line is drawn)
 228         int x_;
 229         /// the width of the vertical blinking bar
 230         int caret_width_;
 231 };
 232
 233
 234 // This is a 'heartbeat' generating synthetic mouse move events when the
 235 // cursor is at the top or bottom edge of the viewport. One scroll per 0.2 s
 236 SyntheticMouseEvent::SyntheticMouseEvent()
 237         : timeout(200), restart_timeout(true)
 238 {}
 239
 240
 241 GuiWorkArea::Private::Private(GuiWorkArea * parent)
 242 : p(parent), buffer_view_(0), lyx_view_(0), caret_(0),
 243   caret_visible_(false), need_resize_(false), preedit_lines_(1),
 244   last_pixel_ratio_(1.0), completer_(new GuiCompleter(p, p)),
 245   dialog_mode_(false), shell_escape_(false), read_only_(false),
 246   clean_(true), externally_modified_(false)
 247 {
 248 /* Qt on macOS and Wayland does not respect the
 249  * Qt::WA_OpaquePaintEvent attribute and resets the widget backing
 250  * store at each update. Therefore, we use our own backing store in
 251  * these two cases. */
 252 #if QT_VERSION >= 0x050000
 253         use_backingstore_ = guiApp->platformName() == "cocoa"
 254                 || guiApp->platformName().contains("wayland");
 255 #else
 256 #  ifdef Q_OS_MAC
 257         use_backingstore_ = true;
 258 #  else
 259         use_backingstore_ = false;
 260 #  endif
 261 #endif
 262
 263         int const time = QApplication::cursorFlashTime() / 2;
 264         if (time > 0) {
 265                 caret_timeout_.setInterval(time);
 266                 caret_timeout_.start();
 267         } else {
 268                 // let's initialize this just to be safe
 269                 caret_timeout_.setInterval(500);
 270         }
 271 }
 272
 273
 274 GuiWorkArea::Private::~Private()
 275 {
 276         // If something is wrong with the buffer, we can ignore it safely
 277         try {
 278                 buffer_view_->buffer().workAreaManager().remove(p);
 279         } catch(...) {}
 280         delete buffer_view_;
 281         delete caret_;
 282         // Completer has a QObject parent and is thus automatically destroyed.
 283         // See #4758.
 284         // delete completer_;
 285 }
 286
 287
 288 GuiWorkArea::GuiWorkArea(QWidget * /* w */)
 289 : d(new Private(this))
 290 {
 291         new CompressorProxy(this); // not a leak
 292 }
 293
 294
 295 GuiWorkArea::GuiWorkArea(Buffer & buffer, GuiView & gv)
 296 : d(new Private(this))
 297 {
 298         new CompressorProxy(this); // not a leak
 299         setGuiView(gv);
 300         buffer.params().display_pixel_ratio = theGuiApp()->pixelRatio();
 301         setBuffer(buffer);
 302         init();
 303 }
 304
 305
 306 double GuiWorkArea::pixelRatio() const
 307 {
 308 #if QT_VERSION >= 0x050000
 309         return qt_scale_factor * devicePixelRatio();
 310 #else
 311         return 1.0;
 312 #endif
 313 }
 314
 315
 316 void GuiWorkArea::init()
 317 {
 318         // Setup the signals
 319         connect(&d->caret_timeout_, SIGNAL(timeout()),
 320                 this, SLOT(toggleCaret()));
 321
 322         // This connection is closed at the same time as this is destroyed.
 323         d->synthetic_mouse_event_.timeout.timeout.connect([this](){
 324                         generateSyntheticMouseEvent();
 325                 });
 326
 327         d->resetScreen();
 328         // With Qt4.5 a mouse event will happen before the first paint event
 329         // so make sure that the buffer view has an up to date metrics.
 330         d->buffer_view_->resize(viewport()->width(), viewport()->height());
 331         d->caret_ = new frontend::CaretWidget();
 332
 333         setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 334         setAcceptDrops(true);
 335         setMouseTracking(true);
 336         setMinimumSize(100, 70);
 337         setFrameStyle(QFrame::NoFrame);
 338         updateWindowTitle();
 339
 340         d->updateCursorShape();
 341
 342         // we paint our own background
 343         viewport()->setAttribute(Qt::WA_OpaquePaintEvent);
 344
 345         setFocusPolicy(Qt::StrongFocus);
 346
 347         LYXERR(Debug::GUI, "viewport width: " << viewport()->width()
 348                 << "  viewport height: " << viewport()->height());
 349
 350         // Enables input methods for asian languages.
 351         // Must be set when creating custom text editing widgets.
 352         setAttribute(Qt::WA_InputMethodEnabled, true);
 353 }
 354
 355
 356 GuiWorkArea::~GuiWorkArea()
 357 {
 358         delete d;
 359 }
 360
 361
 362 void GuiWorkArea::Private::updateCursorShape()
 363 {
 364         bool const clickable = buffer_view_ && buffer_view_->clickableInset();
 365         p->viewport()->setCursor(clickable ? Qt::PointingHandCursor
 366                                            : Qt::IBeamCursor);
 367 }
 368
 369
 370 void GuiWorkArea::setGuiView(GuiView & gv)
 371 {
 372         d->lyx_view_ = &gv;
 373 }
 374
 375
 376 void GuiWorkArea::setBuffer(Buffer & buffer)
 377 {
 378         delete d->buffer_view_;
 379         d->buffer_view_ = new BufferView(buffer);
 380         buffer.workAreaManager().add(this);
 381
 382         // HACK: Prevents an additional redraw when the scrollbar pops up
 383         // which regularily happens on documents with more than one page.
 384         // The policy  should be set to "Qt::ScrollBarAsNeeded" soon.
 385         // Since we have no geometry information yet, we assume that
 386         // a document needs a scrollbar if there is more then four
 387         // paragraph in the outermost text.
 388         if (buffer.text().paragraphs().size() > 4)
 389                 setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
 390         QTimer::singleShot(50, this, SLOT(fixVerticalScrollBar()));
 391         Q_EMIT bufferViewChanged();
 392 }
 393
 394
 395 void GuiWorkArea::fixVerticalScrollBar()
 396 {
 397         if (!isFullScreen())
 398                 setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
 399 }
 400
 401
 402 void GuiWorkArea::close()
 403 {
 404         d->lyx_view_->removeWorkArea(this);
 405 }
 406
 407
 408 void GuiWorkArea::setFullScreen(bool full_screen)
 409 {
 410         d->buffer_view_->setFullScreen(full_screen);
 411         setFrameStyle(QFrame::NoFrame);
 412         if (full_screen) {
 413                 setFrameStyle(QFrame::NoFrame);
 414                 if (lyxrc.full_screen_scrollbar)
 415                         setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 416         } else
 417                 setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
 418 }
 419
 420
 421 BufferView & GuiWorkArea::bufferView()
 422 {
 423         return *d->buffer_view_;
 424 }
 425
 426
 427 BufferView const & GuiWorkArea::bufferView() const
 428 {
 429         return *d->buffer_view_;
 430 }
 431
 432
 433 void GuiWorkArea::stopBlinkingCaret()
 434 {
 435         d->caret_timeout_.stop();
 436         d->hideCaret();
 437 }
 438
 439
 440 void GuiWorkArea::startBlinkingCaret()
 441 {
 442         // do not show the cursor if the view is busy
 443         if (view().busy())
 444                 return;
 445
 446         Point p;
 447         int h = 0;
 448         d->buffer_view_->caretPosAndHeight(p, h);
 449         // Don't start blinking if the cursor isn't on screen.
 450         if (!d->buffer_view_->cursorInView(p, h))
 451                 return;
 452
 453         d->showCaret();
 454
 455         //we're not supposed to cache this value.
 456         int const time = QApplication::cursorFlashTime() / 2;
 457         if (time <= 0)
 458                 return;
 459         d->caret_timeout_.setInterval(time);
 460         d->caret_timeout_.start();
 461 }
 462
 463
 464 void GuiWorkArea::toggleCaret()
 465 {
 466         if (d->caret_visible_)
 467                 d->hideCaret();
 468         else
 469                 d->showCaret();
 470 }
 471
 472
 473 void GuiWorkArea::scheduleRedraw(bool update_metrics)
 474 {
 475         if (!isVisible())
 476                 // No need to redraw in this case.
 477                 return;
 478
 479         // No need to do anything if this is the current view. The BufferView
 480         // metrics are already up to date.
 481         if (update_metrics || d->lyx_view_ != guiApp->currentView()
 482                 || d->lyx_view_->currentWorkArea() != this) {
 483                 // FIXME: it would be nice to optimize for the off-screen case.
 484                 d->buffer_view_->cursor().fixIfBroken();
 485                 d->buffer_view_->updateMetrics();
 486                 d->buffer_view_->cursor().fixIfBroken();
 487         }
 488
 489         // update caret position, because otherwise it has to wait until
 490         // the blinking interval is over
 491         d->updateCaretGeometry();
 492
 493         LYXERR(Debug::WORKAREA, "WorkArea::redraw screen");
 494         viewport()->update();
 495
 496         /// FIXME: is this still true now that paintEvent does the actual painting?
 497         /// \warning: scrollbar updating *must* be done after the BufferView is drawn
 498         /// because \c BufferView::updateScrollbar() is called in \c BufferView::draw().
 499         d->updateScrollbar();
 500         d->lyx_view_->updateStatusBar();
 501
 502         if (lyxerr.debugging(Debug::WORKAREA))
 503                 d->buffer_view_->coordCache().dump();
 504
 505         updateWindowTitle();
 506
 507         d->updateCursorShape();
 508 }
 509
 510
 511 // Keep in sync with GuiWorkArea::processKeySym below
 512 bool GuiWorkArea::queryKeySym(KeySymbol const & key, KeyModifier mod) const
 513 {
 514         return guiApp->queryKeySym(key, mod);
 515 }
 516
 517
 518 // Keep in sync with GuiWorkArea::queryKeySym above
 519 void GuiWorkArea::processKeySym(KeySymbol const & key, KeyModifier mod)
 520 {
 521         if (d->lyx_view_->isFullScreen() && d->lyx_view_->menuBar()->isVisible()
 522                 && lyxrc.full_screen_menubar) {
 523                 // FIXME HACK: we should not have to do this here. See related comment
 524                 // in GuiView::event() (QEvent::ShortcutOverride)
 525                 d->lyx_view_->menuBar()->hide();
 526         }
 527
 528         // In order to avoid bad surprise in the middle of an operation,
 529         // we better stop the blinking caret...
 530         // the caret gets restarted in GuiView::restartCaret()
 531         stopBlinkingCaret();
 532         guiApp->processKeySym(key, mod);
 533 }
 534
 535
 536 void GuiWorkArea::Private::dispatch(FuncRequest const & cmd)
 537 {
 538         // Handle drag&drop
 539         if (cmd.action() == LFUN_FILE_OPEN) {
 540                 DispatchResult dr;
 541                 lyx_view_->dispatch(cmd, dr);
 542                 return;
 543         }
 544
 545         bool const notJustMovingTheMouse =
 546                 cmd.action() != LFUN_MOUSE_MOTION || cmd.button() != mouse_button::none;
 547
 548         // In order to avoid bad surprise in the middle of an operation, we better stop
 549         // the blinking caret.
 550         if (notJustMovingTheMouse)
 551                 p->stopBlinkingCaret();
 552
 553         buffer_view_->mouseEventDispatch(cmd);
 554
 555         // Skip these when selecting
 556         // FIXME: let GuiView take care of those.
 557         if (cmd.action() != LFUN_MOUSE_MOTION) {
 558                 completer_->updateVisibility(false, false);
 559                 lyx_view_->updateDialogs();
 560                 lyx_view_->updateStatusBar();
 561         }
 562
 563         // GUI tweaks except with mouse motion with no button pressed.
 564         if (notJustMovingTheMouse) {
 565                 // Slight hack: this is only called currently when we
 566                 // clicked somewhere, so we force through the display
 567                 // of the new status here.
 568                 // FIXME: let GuiView take care of those.
 569                 lyx_view_->clearMessage();
 570
 571                 // Show the caret immediately after any operation
 572                 p->startBlinkingCaret();
 573         }
 574
 575         updateCursorShape();
 576 }
 577
 578
 579 void GuiWorkArea::Private::resizeBufferView()
 580 {
 581         // WARNING: Please don't put any code that will trigger a repaint here!
 582         // We are already inside a paint event.
 583         p->stopBlinkingCaret();
 584         // Warn our container (GuiView).
 585         p->busy(true);
 586
 587         Point point;
 588         int h = 0;
 589         buffer_view_->caretPosAndHeight(point, h);
 590         bool const caret_in_view = buffer_view_->cursorInView(point, h);
 591         buffer_view_->resize(p->viewport()->width(), p->viewport()->height());
 592         if (caret_in_view)
 593                 buffer_view_->scrollToCursor();
 594         updateCaretGeometry();
 595
 596         // Update scrollbars which might have changed due different
 597         // BufferView dimension. This is especially important when the
 598         // BufferView goes from zero-size to the real-size for the first time,
 599         // as the scrollbar paramters are then set for the first time.
 600         updateScrollbar();
 601
 602         need_resize_ = false;
 603         p->busy(false);
 604         // Eventually, restart the caret after the resize event.
 605         // We might be resizing even if the focus is on another widget so we only
 606         // restart the caret if we have the focus.
 607         if (p->hasFocus())
 608                 QTimer::singleShot(50, p, SLOT(startBlinkingCaret()));
 609 }
 610
 611
 612 void GuiWorkArea::Private::updateCaretGeometry()
 613 {
 614         Point point;
 615         int h = 0;
 616         buffer_view_->caretPosAndHeight(point, h);
 617         if (!buffer_view_->cursorInView(point, h))
 618                 return;
 619
 620         // RTL or not RTL
 621         bool l_shape = false;
 622         Font const & realfont = buffer_view_->cursor().real_current_font;
 623         BufferParams const & bp = buffer_view_->buffer().params();
 624         bool const samelang = realfont.language() == bp.language;
 625         bool const isrtl = realfont.isVisibleRightToLeft();
 626
 627         if (!samelang || isrtl != bp.language->rightToLeft())
 628                 l_shape = true;
 629
 630         // The ERT language hack needs fixing up
 631         if (realfont.language() == latex_language)
 632                 l_shape = false;
 633
 634         // show caret on screen
 635         Cursor & cur = buffer_view_->cursor();
 636         bool completable = cur.inset().showCompletionCursor()
 637                 && completer_->completionAvailable()
 638                 && !completer_->popupVisible()
 639                 && !completer_->inlineVisible();
 640         caret_visible_ = true;
 641
 642         caret_->update(point.x_, point.y_, h, l_shape, isrtl, completable);
 643 }
 644
 645
 646 void GuiWorkArea::Private::showCaret()
 647 {
 648         if (caret_visible_)
 649                 return;
 650
 651         updateCaretGeometry();
 652         p->viewport()->update();
 653 }
 654
 655
 656 void GuiWorkArea::Private::hideCaret()
 657 {
 658         if (!caret_visible_)
 659                 return;
 660
 661         caret_visible_ = false;
 662         //if (!qApp->focusWidget())
 663                 p->viewport()->update();
 664 }
 665
 666
 667 void GuiWorkArea::Private::updateScrollbar()
 668 {
 669         // Prevent setRange() and setSliderPosition from causing recursive calls via
 670         // the signal valueChanged. (#10311)
 671         QObject::disconnect(p->verticalScrollBar(), SIGNAL(valueChanged(int)),
 672                             p, SLOT(scrollTo(int)));
 673         ScrollbarParameters const & scroll_ = buffer_view_->scrollbarParameters();
 674         p->verticalScrollBar()->setRange(scroll_.min, scroll_.max);
 675         p->verticalScrollBar()->setPageStep(scroll_.page_step);
 676         p->verticalScrollBar()->setSingleStep(scroll_.single_step);
 677         p->verticalScrollBar()->setSliderPosition(0);
 678         // Connect to the vertical scroll bar
 679         QObject::connect(p->verticalScrollBar(), SIGNAL(valueChanged(int)),
 680                          p, SLOT(scrollTo(int)));
 681 }
 682
 683
 684 void GuiWorkArea::scrollTo(int value)
 685 {
 686         stopBlinkingCaret();
 687         d->buffer_view_->scrollDocView(value, true);
 688
 689         if (lyxrc.cursor_follows_scrollbar) {
 690                 d->buffer_view_->setCursorFromScrollbar();
 691                 // FIXME: let GuiView take care of those.
 692                 d->lyx_view_->updateLayoutList();
 693         }
 694         // Show the caret immediately after any operation.
 695         startBlinkingCaret();
 696         // FIXME QT5
 697 #ifdef Q_WS_X11
 698         QApplication::syncX();
 699 #endif
 700 }
 701
 702
 703 bool GuiWorkArea::event(QEvent * e)
 704 {
 705         switch (e->type()) {
 706         case QEvent::ToolTip: {
 707                 QHelpEvent * helpEvent = static_cast<QHelpEvent *>(e);
 708                 if (lyxrc.use_tooltip) {
 709                         QPoint pos = helpEvent->pos();
 710                         if (pos.x() < viewport()->width()) {
 711                                 QString s = toqstr(d->buffer_view_->toolTip(pos.x(), pos.y()));
 712                                 QToolTip::showText(helpEvent->globalPos(), formatToolTip(s,35));
 713                         }
 714                         else
 715                                 QToolTip::hideText();
 716                 }
 717                 // Don't forget to accept the event!
 718                 e->accept();
 719                 return true;
 720         }
 721
 722         case QEvent::ShortcutOverride:
 723                 // keyPressEvent is ShortcutOverride-aware and only accepts the event in
 724                 // this case
 725                 keyPressEvent(static_cast<QKeyEvent *>(e));
 726                 return e->isAccepted();
 727
 728         case QEvent::KeyPress: {
 729                 // We catch this event in order to catch the Tab or Shift+Tab key press
 730                 // which are otherwise reserved to focus switching between controls
 731                 // within a dialog.
 732                 QKeyEvent * ke = static_cast<QKeyEvent*>(e);
 733                 if ((ke->key() == Qt::Key_Tab && ke->modifiers() == Qt::NoModifier)
 734                         || (ke->key() == Qt::Key_Backtab && (
 735                                 ke->modifiers() == Qt::ShiftModifier
 736                                 || ke->modifiers() == Qt::NoModifier))) {
 737                         keyPressEvent(ke);
 738                         return true;
 739                 }
 740                 return QAbstractScrollArea::event(e);
 741         }
 742
 743         default:
 744                 return QAbstractScrollArea::event(e);
 745         }
 746         return false;
 747 }
 748
 749
 750 void GuiWorkArea::contextMenuEvent(QContextMenuEvent * e)
 751 {
 752         string name;
 753         if (e->reason() == QContextMenuEvent::Mouse)
 754                 // the menu name is set on mouse press
 755                 name = d->context_menu_name_;
 756         else {
 757                 QPoint pos = e->pos();
 758                 Cursor const & cur = d->buffer_view_->cursor();
 759                 if (e->reason() == QContextMenuEvent::Keyboard && cur.inTexted()) {
 760                         // Do not access the context menu of math right in front of before
 761                         // the cursor. This does not work when the cursor is in text.
 762                         Inset * inset = cur.paragraph().getInset(cur.pos());
 763                         if (inset && inset->asInsetMath())
 764                                 --pos.rx();
 765                         else if (cur.pos() > 0) {
 766                                 Inset * inset = cur.paragraph().getInset(cur.pos() - 1);
 767                                 if (inset)
 768                                         ++pos.rx();
 769                         }
 770                 }
 771                 name = d->buffer_view_->contextMenu(pos.x(), pos.y());
 772         }
 773
 774         if (name.empty()) {
 775                 e->accept();
 776                 return;
 777         }
 778         // always show mnemonics when the keyboard is used to show the context menu
 779         // FIXME: This should be fixed in Qt itself
 780         bool const keyboard = (e->reason() == QContextMenuEvent::Keyboard);
 781         QMenu * menu = guiApp->menus().menu(toqstr(name), *d->lyx_view_, keyboard);
 782         if (!menu) {
 783                 e->accept();
 784                 return;
 785         }
 786         // Position the menu to the right.
 787         // FIXME: menu position should be different for RTL text.
 788         menu->exec(e->globalPos());
 789         e->accept();
 790 }
 791
 792
 793 void GuiWorkArea::focusInEvent(QFocusEvent * e)
 794 {
 795         LYXERR(Debug::DEBUG, "GuiWorkArea::focusInEvent(): " << this << endl);
 796         if (d->lyx_view_->currentWorkArea() != this) {
 797                 d->lyx_view_->setCurrentWorkArea(this);
 798                 d->lyx_view_->currentWorkArea()->bufferView().buffer().updateBuffer();
 799         }
 800
 801         startBlinkingCaret();
 802         QAbstractScrollArea::focusInEvent(e);
 803 }
 804
 805
 806 void GuiWorkArea::focusOutEvent(QFocusEvent * e)
 807 {
 808         LYXERR(Debug::DEBUG, "GuiWorkArea::focusOutEvent(): " << this << endl);
 809         stopBlinkingCaret();
 810         QAbstractScrollArea::focusOutEvent(e);
 811 }
 812
 813
 814 void GuiWorkArea::mousePressEvent(QMouseEvent * e)
 815 {
 816         if (d->dc_event_.active && d->dc_event_ == *e) {
 817                 d->dc_event_.active = false;
 818                 FuncRequest cmd(LFUN_MOUSE_TRIPLE, e->x(), e->y(),
 819                         q_button_state(e->button()), q_key_state(e->modifiers()));
 820                 d->dispatch(cmd);
 821                 e->accept();
 822                 return;
 823         }
 824
 825 #if (QT_VERSION < 0x050000) && !defined(__HAIKU__)
 826         inputContext()->reset();
 827 #endif
 828
 829         FuncRequest const cmd(LFUN_MOUSE_PRESS, e->x(), e->y(),
 830                         q_button_state(e->button()), q_key_state(e->modifiers()));
 831         d->dispatch(cmd);
 832
 833         // Save the context menu on mouse press, because also the mouse
 834         // cursor is set on mouse press. Afterwards, we can either release
 835         // the mousebutton somewhere else, or the cursor might have moved
 836         // due to the DEPM. We need to do this after the mouse has been
 837         // set in dispatch(), because the selection state might change.
 838         if (e->button() == Qt::RightButton)
 839                 d->context_menu_name_ = d->buffer_view_->contextMenu(e->x(), e->y());
 840
 841         e->accept();
 842 }
 843
 844
 845 void GuiWorkArea::mouseReleaseEvent(QMouseEvent * e)
 846 {
 847         if (d->synthetic_mouse_event_.timeout.running())
 848                 d->synthetic_mouse_event_.timeout.stop();
 849
 850         FuncRequest const cmd(LFUN_MOUSE_RELEASE, e->x(), e->y(),
 851                         q_button_state(e->button()), q_key_state(e->modifiers()));
 852         d->dispatch(cmd);
 853         e->accept();
 854 }
 855
 856
 857 void GuiWorkArea::mouseMoveEvent(QMouseEvent * e)
 858 {
 859         // we kill the triple click if we move
 860         doubleClickTimeout();
 861         FuncRequest cmd(LFUN_MOUSE_MOTION, e->x(), e->y(),
 862                         q_motion_state(e->buttons()), q_key_state(e->modifiers()));
 863
 864         e->accept();
 865
 866         // If we're above or below the work area...
 867         if ((e->y() <= 20 || e->y() >= viewport()->height() - 20)
 868                         && e->buttons() == mouse_button::button1) {
 869                 // Make sure only a synthetic event can cause a page scroll,
 870                 // so they come at a steady rate:
 871                 if (e->y() <= 20)
 872                         // _Force_ a scroll up:
 873                         cmd.set_y(e->y() - 21);
 874                 else
 875                         cmd.set_y(e->y() + 21);
 876                 // Store the event, to be handled when the timeout expires.
 877                 d->synthetic_mouse_event_.cmd = cmd;
 878
 879                 if (d->synthetic_mouse_event_.timeout.running()) {
 880                         // Discard the event. Note that it _may_ be handled
 881                         // when the timeout expires if
 882                         // synthetic_mouse_event_.cmd has not been overwritten.
 883                         // Ie, when the timeout expires, we handle the
 884                         // most recent event but discard all others that
 885                         // occurred after the one used to start the timeout
 886                         // in the first place.
 887                         return;
 888                 }
 889
 890                 d->synthetic_mouse_event_.restart_timeout = true;
 891                 d->synthetic_mouse_event_.timeout.start();
 892                 // Fall through to handle this event...
 893
 894         } else if (d->synthetic_mouse_event_.timeout.running()) {
 895                 // Store the event, to be possibly handled when the timeout
 896                 // expires.
 897                 // Once the timeout has expired, normal control is returned
 898                 // to mouseMoveEvent (restart_timeout = false).
 899                 // This results in a much smoother 'feel' when moving the
 900                 // mouse back into the work area.
 901                 d->synthetic_mouse_event_.cmd = cmd;
 902                 d->synthetic_mouse_event_.restart_timeout = false;
 903                 return;
 904         }
 905         d->dispatch(cmd);
 906 }
 907
 908
 909 void GuiWorkArea::wheelEvent(QWheelEvent * ev)
 910 {
 911         // Wheel rotation by one notch results in a delta() of 120 (see
 912         // documentation of QWheelEvent)
 913         // But first we have to ignore horizontal scroll events.
 914 #if QT_VERSION < 0x050000
 915         if (ev->orientation() == Qt::Horizontal) {
 916                 ev->accept();
 917                 return;
 918         }
 919         double const delta = ev->delta() / 120.0;
 920 #else
 921         QPoint const aDelta = ev->angleDelta();
 922         // skip horizontal wheel event
 923         if (abs(aDelta.x()) > abs(aDelta.y())) {
 924                 ev->accept();
 925                 return;
 926         }
 927         double const delta = aDelta.y() / 120.0;
 928 #endif
 929
 930         bool zoom = false;
 931         switch (lyxrc.scroll_wheel_zoom) {
 932         case LyXRC::SCROLL_WHEEL_ZOOM_CTRL:
 933                 zoom = ev->modifiers() & Qt::ControlModifier;
 934                 zoom &= !(ev->modifiers() & (Qt::ShiftModifier | Qt::AltModifier));
 935                 break;
 936         case LyXRC::SCROLL_WHEEL_ZOOM_SHIFT:
 937                 zoom = ev->modifiers() & Qt::ShiftModifier;
 938                 zoom &= !(ev->modifiers() & (Qt::ControlModifier | Qt::AltModifier));
 939                 break;
 940         case LyXRC::SCROLL_WHEEL_ZOOM_ALT:
 941                 zoom = ev->modifiers() & Qt::AltModifier;
 942                 zoom &= !(ev->modifiers() & (Qt::ShiftModifier | Qt::ControlModifier));
 943                 break;
 944         case LyXRC::SCROLL_WHEEL_ZOOM_OFF:
 945                 break;
 946         }
 947         if (zoom) {
 948                 docstring arg = convert<docstring>(int(5 * delta));
 949                 lyx::dispatch(FuncRequest(LFUN_BUFFER_ZOOM_IN, arg));
 950                 return;
 951         }
 952
 953         // Take into account the desktop wide settings.
 954         int const lines = qApp->wheelScrollLines();
 955         int const page_step = verticalScrollBar()->pageStep();
 956         // Test if the wheel mouse is set to one screen at a time.
 957         // This is according to
 958         // https://doc.qt.io/qt-5/qapplication.html#wheelScrollLines-prop
 959         int scroll_value =
 960                 min(lines * verticalScrollBar()->singleStep(), page_step);
 961
 962         // Take into account the rotation and the user preferences.
 963         scroll_value = int(scroll_value * delta * lyxrc.mouse_wheel_speed);
 964         LYXERR(Debug::SCROLLING, "wheelScrollLines = " << lines
 965                         << " delta = " << delta << " scroll_value = " << scroll_value
 966                         << " page_step = " << page_step);
 967         // Now scroll.
 968         verticalScrollBar()->setValue(verticalScrollBar()->value() - scroll_value);
 969
 970         ev->accept();
 971 }
 972
 973
 974 void GuiWorkArea::generateSyntheticMouseEvent()
 975 {
 976         int const e_y = d->synthetic_mouse_event_.cmd.y();
 977         int const wh = d->buffer_view_->workHeight();
 978         bool const up = e_y < 0;
 979         bool const down = e_y > wh;
 980
 981         // Set things off to generate the _next_ 'pseudo' event.
 982         int step = 50;
 983         if (d->synthetic_mouse_event_.restart_timeout) {
 984                 // This is some magic formulae to determine the speed
 985                 // of scrolling related to the position of the mouse.
 986                 int time = 200;
 987                 if (up || down) {
 988                         int dist = up ? -e_y : e_y - wh;
 989                         time = max(min(200, 250000 / (dist * dist)), 1) ;
 990
 991                         if (time < 40) {
 992                                 step = 80000 / (time * time);
 993                                 time = 40;
 994                         }
 995                 }
 996                 d->synthetic_mouse_event_.timeout.setTimeout(time);
 997                 d->synthetic_mouse_event_.timeout.start();
 998         }
 999
1000         // Can we scroll further ?
1001         int const value = verticalScrollBar()->value();
1002         if (value == verticalScrollBar()->maximum()
1003                   || value == verticalScrollBar()->minimum()) {
1004                 d->synthetic_mouse_event_.timeout.stop();
1005                 return;
1006         }
1007
1008         // Scroll
1009         if (step <= 2 * wh) {
1010                 d->buffer_view_->scroll(up ? -step : step);
1011                 d->buffer_view_->updateMetrics();
1012         } else {
1013                 d->buffer_view_->scrollDocView(value + (up ? -step : step), false);
1014         }
1015
1016         // In which paragraph do we have to set the cursor ?
1017         Cursor & cur = d->buffer_view_->cursor();
1018         // FIXME: we don't know how to handle math.
1019         Text * text = cur.text();
1020         if (!text)
1021                 return;
1022         TextMetrics const & tm = d->buffer_view_->textMetrics(text);
1023
1024         // Quit gracefully if there are no metrics, since otherwise next
1025         // line would crash (bug #10324).
1026         // This situation seems related to a (not yet understood) timing problem.
1027         if (tm.empty())
1028                 return;
1029
1030         pair<pit_type, const ParagraphMetrics *> pp = up ? tm.first() : tm.last();
1031         ParagraphMetrics const & pm = *pp.second;
1032         pit_type const pit = pp.first;
1033
1034         if (pm.rows().empty())
1035                 return;
1036
1037         // Find the row at which we set the cursor.
1038         RowList::const_iterator rit = pm.rows().begin();
1039         RowList::const_iterator rlast = pm.rows().end();
1040         int yy = pm.position() - pm.ascent();
1041         for (--rlast; rit != rlast; ++rit) {
1042                 int h = rit->height();
1043                 if ((up && yy + h > 0)
1044                           || (!up && yy + h > wh - defaultRowHeight()))
1045                         break;
1046                 yy += h;
1047         }
1048
1049         // Find the position of the cursor
1050         bool bound;
1051         int x = d->synthetic_mouse_event_.cmd.x();
1052         pos_type const pos = tm.getPosNearX(*rit, x, bound);
1053
1054         // Set the cursor
1055         cur.pit() = pit;
1056         cur.pos() = pos;
1057         cur.boundary(bound);
1058
1059         d->buffer_view_->buffer().changed(false);
1060         return;
1061 }
1062
1063
1064 // CompressorProxy adapted from Kuba Ober https://stackoverflow.com/a/21006207
1065 CompressorProxy::CompressorProxy(GuiWorkArea * wa) : QObject(wa), flag_(false)
1066 {
1067         qRegisterMetaType<KeySymbol>("KeySymbol");
1068         qRegisterMetaType<KeyModifier>("KeyModifier");
1069         connect(wa, SIGNAL(compressKeySym(KeySymbol, KeyModifier, bool)),
1070                 this, SLOT(slot(KeySymbol, KeyModifier, bool)),
1071                 Qt::QueuedConnection);
1072         connect(this, SIGNAL(signal(KeySymbol, KeyModifier)),
1073                 wa, SLOT(processKeySym(KeySymbol, KeyModifier)));
1074 }
1075
1076
1077 bool CompressorProxy::emitCheck(bool isAutoRepeat)
1078 {
1079         flag_ = true;
1080         if (isAutoRepeat)
1081                 QCoreApplication::sendPostedEvents(this, QEvent::MetaCall); // recurse
1082         bool result = flag_;
1083         flag_ = false;
1084         return result;
1085 }
1086
1087
1088 void CompressorProxy::slot(KeySymbol sym, KeyModifier mod, bool isAutoRepeat)
1089 {
1090         if (emitCheck(isAutoRepeat))
1091                 Q_EMIT signal(sym, mod);
1092         else
1093                 LYXERR(Debug::KEY, "system is busy: autoRepeat key event ignored");
1094 }
1095
1096
1097 void GuiWorkArea::keyPressEvent(QKeyEvent * ev)
1098 {
1099         // this is also called for ShortcutOverride events. In this case, one must
1100         // not act but simply accept the event explicitly.
1101         bool const act = (ev->type() != QEvent::ShortcutOverride);
1102
1103         // Do not process here some keys if dialog_mode_ is set
1104         bool const for_dialog_mode = d->dialog_mode_
1105                 && (ev->modifiers() == Qt::NoModifier
1106                     || ev->modifiers() == Qt::ShiftModifier)
1107                 && (ev->key() == Qt::Key_Escape
1108                     || ev->key() == Qt::Key_Enter
1109                     || ev->key() == Qt::Key_Return);
1110         // also do not use autoRepeat to input shortcuts
1111         bool const autoRepeat = ev->isAutoRepeat();
1112
1113         if (for_dialog_mode || (!act && autoRepeat)) {
1114                 ev->ignore();
1115                 return;
1116         }
1117
1118         // intercept some keys if completion popup is visible
1119         if (d->completer_->popupVisible()) {
1120                 switch (ev->key()) {
1121                 case Qt::Key_Enter:
1122                 case Qt::Key_Return:
1123                         if (act)
1124                                 d->completer_->activate();
1125                         ev->accept();
1126                         return;
1127                 }
1128         }
1129
1130         KeyModifier const m = q_key_state(ev->modifiers());
1131
1132         if (act && lyxerr.debugging(Debug::KEY)) {
1133                 std::string str;
1134                 if (m & ShiftModifier)
1135                         str += "Shift-";
1136                 if (m & ControlModifier)
1137                         str += "Control-";
1138                 if (m & AltModifier)
1139                         str += "Alt-";
1140                 if (m & MetaModifier)
1141                         str += "Meta-";
1142                 LYXERR(Debug::KEY, " count: " << ev->count() << " text: " << ev->text()
1143                        << " isAutoRepeat: " << ev->isAutoRepeat() << " key: " << ev->key()
1144                        << " keyState: " << str);
1145         }
1146
1147         KeySymbol sym;
1148         setKeySymbol(&sym, ev);
1149         if (sym.isOK()) {
1150                 if (act) {
1151                         Q_EMIT compressKeySym(sym, m, autoRepeat);
1152                         ev->accept();
1153                 } else
1154                         // here, !autoRepeat, as determined at the beginning
1155                         ev->setAccepted(queryKeySym(sym, m));
1156         } else {
1157                 ev->ignore();
1158         }
1159 }
1160
1161
1162 void GuiWorkArea::doubleClickTimeout()
1163 {
1164         d->dc_event_.active = false;
1165 }
1166
1167
1168 void GuiWorkArea::mouseDoubleClickEvent(QMouseEvent * ev)
1169 {
1170         d->dc_event_ = DoubleClick(ev);
1171         QTimer::singleShot(QApplication::doubleClickInterval(), this,
1172                         SLOT(doubleClickTimeout()));
1173         FuncRequest cmd(LFUN_MOUSE_DOUBLE, ev->x(), ev->y(),
1174                         q_button_state(ev->button()), q_key_state(ev->modifiers()));
1175         d->dispatch(cmd);
1176         ev->accept();
1177 }
1178
1179
1180 void GuiWorkArea::resizeEvent(QResizeEvent * ev)
1181 {
1182         QAbstractScrollArea::resizeEvent(ev);
1183         d->need_resize_ = true;
1184         ev->accept();
1185 }
1186
1187
1188 void GuiWorkArea::Private::paintPreeditText(GuiPainter & pain)
1189 {
1190         if (preedit_string_.empty())
1191                 return;
1192
1193         // FIXME: shall we use real_current_font here? (see #10478)
1194         FontInfo const font = buffer_view_->cursor().getFont().fontInfo();
1195         FontMetrics const & fm = theFontMetrics(font);
1196         int const height = fm.maxHeight();
1197         int cur_x = caret_->rect().left();
1198         int cur_y = caret_->rect().bottom();
1199
1200         // get attributes of input method cursor.
1201         // cursor_pos : cursor position in preedit string.
1202         size_t cursor_pos = 0;
1203         bool cursor_is_visible = false;
1204         for (auto const & attr : preedit_attr_) {
1205                 if (attr.type == QInputMethodEvent::Cursor) {
1206                         cursor_pos = attr.start;
1207                         cursor_is_visible = attr.length != 0;
1208                         break;
1209                 }
1210         }
1211
1212         size_t const preedit_length = preedit_string_.length();
1213
1214         // get position of selection in input method.
1215         // FIXME: isn't there a way to do this simplier?
1216         // rStart : cursor position in selected string in IM.
1217         size_t rStart = 0;
1218         // rLength : selected string length in IM.
1219         size_t rLength = 0;
1220         if (cursor_pos < preedit_length) {
1221                 for (auto const & attr : preedit_attr_) {
1222                         if (attr.type == QInputMethodEvent::TextFormat) {
1223                                 if (attr.start <= int(cursor_pos)
1224                                         && int(cursor_pos) < attr.start + attr.length) {
1225                                                 rStart = attr.start;
1226                                                 rLength = attr.length;
1227                                                 if (!cursor_is_visible)
1228                                                         cursor_pos += rLength;
1229                                                 break;
1230                                 }
1231                         }
1232                 }
1233         }
1234         else {
1235                 rStart = cursor_pos;
1236                 rLength = 0;
1237         }
1238
1239         int const right_margin = buffer_view_->rightMargin();
1240         Painter::preedit_style ps;
1241         // Most often there would be only one line:
1242         preedit_lines_ = 1;
1243         for (size_t pos = 0; pos != preedit_length; ++pos) {
1244                 char_type const typed_char = preedit_string_[pos];
1245                 // reset preedit string style
1246                 ps = Painter::preedit_default;
1247
1248                 // if we reached the right extremity of the screen, go to next line.
1249                 if (cur_x + fm.width(typed_char) > p->viewport()->width() - right_margin) {
1250                         cur_x = right_margin;
1251                         cur_y += height + 1;
1252                         ++preedit_lines_;
1253                 }
1254                 // preedit strings are displayed with dashed underline
1255                 // and partial strings are displayed white on black indicating
1256                 // that we are in selecting mode in the input method.
1257                 // FIXME: rLength == preedit_length is not a changing condition
1258                 // FIXME: should be put out of the loop.
1259                 if (pos >= rStart
1260                         && pos < rStart + rLength
1261                         && !(cursor_pos < rLength && rLength == preedit_length))
1262                         ps = Painter::preedit_selecting;
1263
1264                 if (pos == cursor_pos
1265                         && (cursor_pos < rLength && rLength == preedit_length))
1266                         ps = Painter::preedit_cursor;
1267
1268                 // draw one character and update cur_x.
1269                 cur_x += pain.preeditText(cur_x, cur_y, typed_char, font, ps);
1270         }
1271 }
1272
1273
1274 void GuiWorkArea::Private::resetScreen()
1275 {
1276         if (use_backingstore_) {
1277                 int const pr = p->pixelRatio();
1278                 screen_ = QImage(static_cast<int>(pr * p->viewport()->width()),
1279                                  static_cast<int>(pr * p->viewport()->height()),
1280                                  QImage::Format_ARGB32_Premultiplied);
1281 #  if QT_VERSION >= 0x050000
1282                 screen_.setDevicePixelRatio(pr);
1283 #  endif
1284         }
1285 }
1286
1287
1288 QPaintDevice * GuiWorkArea::Private::screenDevice()
1289 {
1290         if (use_backingstore_)
1291                 return &screen_;
1292         else
1293                 return p->viewport();
1294 }
1295
1296
1297 void GuiWorkArea::Private::updateScreen(QRectF const & rc)
1298 {
1299         if (use_backingstore_) {
1300                 QPainter qpain(p->viewport());
1301                 double const pr = p->pixelRatio();
1302                 QRectF const rcs = QRectF(rc.x() * pr, rc.y() * pr,
1303                                           rc.width() * pr, rc.height() * pr);
1304                 qpain.drawImage(rc, screen_, rcs);
1305         }
1306 }
1307
1308
1309 void GuiWorkArea::paintEvent(QPaintEvent * ev)
1310 {
1311         // Do not trigger the painting machinery if we are not ready (see
1312         // bug #10989). The second test triggers when in the middle of a
1313         // dispatch operation.
1314         if (view().busy() || d->buffer_view_->buffer().undo().activeUndoGroup()) {
1315                 // Since macOS has turned the screen black at this point, our
1316                 // backing store has to be copied to screen (this is a no-op
1317                 // except on macOS).
1318                 d->updateScreen(ev->rect());
1319                 // Ignore this paint event, but request a new one for later.
1320                 viewport()->update(ev->rect());
1321                 ev->accept();
1322                 return;
1323         }
1324
1325         // LYXERR(Debug::PAINTING, "paintEvent begin: x: " << rc.x()
1326         //      << " y: " << rc.y() << " w: " << rc.width() << " h: " << rc.height());
1327
1328         if (d->need_resize_ || pixelRatio() != d->last_pixel_ratio_) {
1329                 d->resetScreen();
1330                 d->resizeBufferView();
1331         }
1332
1333         d->last_pixel_ratio_ = pixelRatio();
1334
1335         GuiPainter pain(d->screenDevice(), pixelRatio());
1336
1337         d->buffer_view_->draw(pain, d->caret_visible_);
1338
1339         // The preedit text, if needed
1340         d->paintPreeditText(pain);
1341
1342         // and the caret
1343         if (d->caret_visible_)
1344                 d->caret_->draw(pain, d->buffer_view_->horizScrollOffset());
1345
1346         d->updateScreen(ev->rect());
1347
1348         ev->accept();
1349 }
1350
1351
1352 void GuiWorkArea::inputMethodEvent(QInputMethodEvent * e)
1353 {
1354         LYXERR(Debug::KEY, "preeditString: " << e->preeditString()
1355                    << " commitString: " << e->commitString());
1356
1357         // insert the processed text in the document (handles undo)
1358         if (!e->commitString().isEmpty()) {
1359                 FuncRequest cmd(LFUN_SELF_INSERT,
1360                                 qstring_to_ucs4(e->commitString()),
1361                                 FuncRequest::KEYBOARD);
1362                 dispatch(cmd);
1363                 // FIXME: this is supposed to remove traces from preedit
1364                 // string. Can we avoid calling it explicitely?
1365                 d->buffer_view_->updateMetrics();
1366         }
1367
1368         // Hide the caret during the test transformation.
1369         if (e->preeditString().isEmpty())
1370                 startBlinkingCaret();
1371         else
1372                 stopBlinkingCaret();
1373
1374         if (d->preedit_string_.empty() && e->preeditString().isEmpty()) {
1375                 // Nothing to do
1376                 e->accept();
1377                 return;
1378         }
1379
1380         // The preedit text and its attributes will be used in paintPreeditText
1381         d->preedit_string_ = qstring_to_ucs4(e->preeditString());
1382         d->preedit_attr_ = e->attributes();
1383
1384
1385         // redraw area of preedit string.
1386         int height = d->caret_->rect().height();
1387         int cur_y = d->caret_->rect().bottom();
1388         viewport()->update(0, cur_y - height, viewport()->width(),
1389                 (height + 1) * d->preedit_lines_);
1390
1391         if (d->preedit_string_.empty()) {
1392                 d->preedit_lines_ = 1;
1393                 e->accept();
1394                 return;
1395         }
1396
1397         // Don't forget to accept the event!
1398         e->accept();
1399 }
1400
1401
1402 QVariant GuiWorkArea::inputMethodQuery(Qt::InputMethodQuery query) const
1403 {
1404         QRect cur_r(0, 0, 0, 0);
1405         switch (query) {
1406                 // this is the CJK-specific composition window position and
1407                 // the context menu position when the menu key is pressed.
1408                 case Qt::ImMicroFocus:
1409                         cur_r = d->caret_->rect();
1410                         if (d->preedit_lines_ != 1)
1411                                 cur_r.moveLeft(10);
1412                         cur_r.moveBottom(cur_r.bottom()
1413                                 + cur_r.height() * (d->preedit_lines_ - 1));
1414                         // return lower right of caret in LyX.
1415                         return cur_r;
1416                 default:
1417                         return QWidget::inputMethodQuery(query);
1418         }
1419 }
1420
1421
1422 void GuiWorkArea::updateWindowTitle()
1423 {
1424         Buffer const & buf = bufferView().buffer();
1425         if (buf.fileName() != d->file_name_
1426             || buf.params().shell_escape != d->shell_escape_
1427             || buf.hasReadonlyFlag() != d->read_only_
1428             || buf.lyxvc().vcstatus() != d->vc_status_
1429             || buf.isClean() != d->clean_
1430             || buf.notifiesExternalModification() != d->externally_modified_) {
1431                 d->file_name_ = buf.fileName();
1432                 d->shell_escape_ = buf.params().shell_escape;
1433                 d->read_only_ = buf.hasReadonlyFlag();
1434                 d->vc_status_ = buf.lyxvc().vcstatus();
1435                 d->clean_ = buf.isClean();
1436                 d->externally_modified_ = buf.notifiesExternalModification();
1437                 Q_EMIT titleChanged(this);
1438         }
1439 }
1440
1441
1442 bool GuiWorkArea::isFullScreen() const
1443 {
1444         return d->lyx_view_ && d->lyx_view_->isFullScreen();
1445 }
1446
1447
1448 bool GuiWorkArea::inDialogMode() const
1449 {
1450         return d->dialog_mode_;
1451 }
1452
1453
1454 void GuiWorkArea::setDialogMode(bool mode)
1455 {
1456         d->dialog_mode_ = mode;
1457 }
1458
1459
1460 GuiCompleter & GuiWorkArea::completer()
1461 {
1462         return *d->completer_;
1463 }
1464
1465 GuiView const & GuiWorkArea::view() const
1466 {
1467         return *d->lyx_view_;
1468 }
1469
1470
1471 GuiView & GuiWorkArea::view()
1472 {
1473         return *d->lyx_view_;
1474 }
1475
1476 ////////////////////////////////////////////////////////////////////
1477 //
1478 // EmbeddedWorkArea
1479 //
1480 ////////////////////////////////////////////////////////////////////
1481
1482
1483 EmbeddedWorkArea::EmbeddedWorkArea(QWidget * w): GuiWorkArea(w)
1484 {
1485         support::TempFile tempfile("embedded.internal");
1486         tempfile.setAutoRemove(false);
1487         buffer_ = theBufferList().newInternalBuffer(tempfile.name().absFileName());
1488         buffer_->setUnnamed(true);
1489         buffer_->setFullyLoaded(true);
1490         setBuffer(*buffer_);
1491         setDialogMode(true);
1492 }
1493
1494
1495 EmbeddedWorkArea::~EmbeddedWorkArea()
1496 {
1497         // No need to destroy buffer and bufferview here, because it is done
1498         // in theBufferList() destruction loop at application exit
1499 }
1500
1501
1502 void EmbeddedWorkArea::closeEvent(QCloseEvent * ev)
1503 {
1504         disable();
1505         GuiWorkArea::closeEvent(ev);
1506 }
1507
1508
1509 void EmbeddedWorkArea::hideEvent(QHideEvent * ev)
1510 {
1511         disable();
1512         GuiWorkArea::hideEvent(ev);
1513 }
1514
1515
1516 QSize EmbeddedWorkArea::sizeHint () const
1517 {
1518         // FIXME(?):
1519         // GuiWorkArea sets the size to the screen's viewport
1520         // by returning a value this gets overridden
1521         // EmbeddedWorkArea is now sized to fit in the layout
1522         // of the parent, and has a minimum size set in GuiWorkArea
1523         // which is what we return here
1524         return QSize(100, 70);
1525 }
1526
1527
1528 void EmbeddedWorkArea::disable()
1529 {
1530         stopBlinkingCaret();
1531         if (view().currentWorkArea() != this)
1532                 return;
1533         // No problem if currentMainWorkArea() is 0 (setCurrentWorkArea()
1534         // tolerates it and shows the background logo), what happens if
1535         // an EmbeddedWorkArea is closed after closing all document WAs
1536         view().setCurrentWorkArea(view().currentMainWorkArea());
1537 }
1538
1539 ////////////////////////////////////////////////////////////////////
1540 //
1541 // TabWorkArea
1542 //
1543 ////////////////////////////////////////////////////////////////////
1544
1545 #ifdef Q_OS_MAC
1546 class NoTabFrameMacStyle : public QProxyStyle {
1547 public:
1548         ///
1549         QRect subElementRect(SubElement element, const QStyleOption * option,
1550                              const QWidget * widget = 0) const
1551         {
1552                 QRect rect = QProxyStyle::subElementRect(element, option, widget);
1553                 bool noBar = static_cast<QTabWidget const *>(widget)->count() <= 1;
1554
1555                 // The Qt Mac style puts the contents into a 3 pixel wide box
1556                 // which looks very ugly and not like other Mac applications.
1557                 // Hence we remove this here, and moreover the 16 pixel round
1558                 // frame above if the tab bar is hidden.
1559                 if (element == QStyle::SE_TabWidgetTabContents) {
1560                         rect.adjust(- rect.left(), 0, rect.left(), 0);
1561                         if (noBar)
1562                                 rect.setTop(0);
1563                 }
1564
1565                 return rect;
1566         }
1567 };
1568
1569 NoTabFrameMacStyle noTabFrameMacStyle;
1570 #endif
1571
1572
1573 TabWorkArea::TabWorkArea(QWidget * parent)
1574         : QTabWidget(parent), clicked_tab_(-1), midpressed_tab_(-1)
1575 {
1576 #ifdef Q_OS_MAC
1577         setStyle(&noTabFrameMacStyle);
1578 #endif
1579
1580         QPalette pal = palette();
1581         pal.setColor(QPalette::Active, QPalette::Button,
1582                 pal.color(QPalette::Active, QPalette::Window));
1583         pal.setColor(QPalette::Disabled, QPalette::Button,
1584                 pal.color(QPalette::Disabled, QPalette::Window));
1585         pal.setColor(QPalette::Inactive, QPalette::Button,
1586                 pal.color(QPalette::Inactive, QPalette::Window));
1587
1588         QObject::connect(this, SIGNAL(currentChanged(int)),
1589                 this, SLOT(on_currentTabChanged(int)));
1590
1591         closeBufferButton = new QToolButton(this);
1592         closeBufferButton->setPalette(pal);
1593         // FIXME: rename the icon to closebuffer.png
1594         closeBufferButton->setIcon(QIcon(getPixmap("images/", "closetab", "svgz,png")));
1595         closeBufferButton->setText("Close File");
1596         closeBufferButton->setAutoRaise(true);
1597         closeBufferButton->setCursor(Qt::ArrowCursor);
1598         closeBufferButton->setToolTip(qt_("Close File"));
1599         closeBufferButton->setEnabled(true);
1600         QObject::connect(closeBufferButton, SIGNAL(clicked()),
1601                 this, SLOT(closeCurrentBuffer()));
1602         setCornerWidget(closeBufferButton, Qt::TopRightCorner);
1603
1604         // set TabBar behaviour
1605         QTabBar * tb = tabBar();
1606         tb->setTabsClosable(!lyxrc.single_close_tab_button);
1607         tb->setSelectionBehaviorOnRemove(QTabBar::SelectPreviousTab);
1608         tb->setElideMode(Qt::ElideNone);
1609         // allow dragging tabs
1610         tb->setMovable(true);
1611         // make us responsible for the context menu of the tabbar
1612         tb->setContextMenuPolicy(Qt::CustomContextMenu);
1613         connect(tb, SIGNAL(customContextMenuRequested(const QPoint &)),
1614                 this, SLOT(showContextMenu(const QPoint &)));
1615         connect(tb, SIGNAL(tabCloseRequested(int)),
1616                 this, SLOT(closeTab(int)));
1617
1618         setUsesScrollButtons(true);
1619 }
1620
1621
1622 void TabWorkArea::mousePressEvent(QMouseEvent *me)
1623 {
1624         if (me->button() == Qt::MidButton)
1625                 midpressed_tab_ = tabBar()->tabAt(me->pos());
1626         else
1627                 QTabWidget::mousePressEvent(me);
1628 }
1629
1630
1631 void TabWorkArea::mouseReleaseEvent(QMouseEvent *me)
1632 {
1633         if (me->button() == Qt::MidButton) {
1634                 int const midreleased_tab = tabBar()->tabAt(me->pos());
1635                 if (midpressed_tab_ == midreleased_tab && posIsTab(me->pos()))
1636                         closeTab(midreleased_tab);
1637         } else
1638                 QTabWidget::mouseReleaseEvent(me);
1639 }
1640
1641
1642 void TabWorkArea::paintEvent(QPaintEvent * event)
1643 {
1644         if (tabBar()->isVisible()) {
1645                 QTabWidget::paintEvent(event);
1646         } else {
1647                 // Prevent the selected tab to influence the
1648                 // painting of the frame of the tab widget.
1649                 // This is needed for gtk style in Qt.
1650                 QStylePainter p(this);
1651 #if QT_VERSION < 0x050000
1652                 QStyleOptionTabWidgetFrameV2 opt;
1653 #else
1654                 QStyleOptionTabWidgetFrame opt;
1655 #endif
1656                 initStyleOption(&opt);
1657                 opt.rect = style()->subElementRect(QStyle::SE_TabWidgetTabPane,
1658                         &opt, this);
1659                 opt.selectedTabRect = QRect();
1660                 p.drawPrimitive(QStyle::PE_FrameTabWidget, opt);
1661         }
1662 }
1663
1664
1665 bool TabWorkArea::posIsTab(QPoint position)
1666 {
1667         // tabAt returns -1 if tab does not covers position
1668         return tabBar()->tabAt(position) > -1;
1669 }
1670
1671
1672 void TabWorkArea::mouseDoubleClickEvent(QMouseEvent * event)
1673 {
1674         if (event->button() != Qt::LeftButton)
1675                 return;
1676
1677         // this code chunk is unnecessary because it seems the event only makes
1678         // it this far if it is not on a tab. I'm not sure why this is (maybe
1679         // it is handled and ended in DragTabBar?), and thus I'm not sure if
1680         // this is true in all cases and if it will be true in the future so I
1681         // leave this code for now. (skostysh, 2016-07-21)
1682         //
1683         // return early if double click on existing tabs
1684         if (posIsTab(event->pos()))
1685                 return;
1686
1687         dispatch(FuncRequest(LFUN_BUFFER_NEW));
1688 }
1689
1690
1691 void TabWorkArea::setFullScreen(bool full_screen)
1692 {
1693         for (int i = 0; i != count(); ++i) {
1694                 if (GuiWorkArea * wa = workArea(i))
1695                         wa->setFullScreen(full_screen);
1696         }
1697
1698         if (lyxrc.full_screen_tabbar)
1699                 showBar(!full_screen && count() > 1);
1700         else
1701                 showBar(count() > 1);
1702 }
1703
1704
1705 void TabWorkArea::showBar(bool show)
1706 {
1707         tabBar()->setEnabled(show);
1708         tabBar()->setVisible(show);
1709         closeBufferButton->setVisible(show && lyxrc.single_close_tab_button);
1710         setTabsClosable(!lyxrc.single_close_tab_button);
1711 }
1712
1713
1714 GuiWorkAreaContainer * TabWorkArea::widget(int index) const
1715 {
1716         QWidget * w = QTabWidget::widget(index);
1717         if (!w)
1718                 return nullptr;
1719         GuiWorkAreaContainer * wac = dynamic_cast<GuiWorkAreaContainer *>(w);
1720         LATTEST(wac);
1721         return wac;
1722 }
1723
1724
1725 GuiWorkAreaContainer * TabWorkArea::currentWidget() const
1726 {
1727         return widget(currentIndex());
1728 }
1729
1730
1731 GuiWorkArea * TabWorkArea::workArea(int index) const
1732 {
1733         GuiWorkAreaContainer * w = widget(index);
1734         if (!w)
1735                 return nullptr;
1736         return w->workArea();
1737 }
1738
1739
1740 GuiWorkArea * TabWorkArea::currentWorkArea() const
1741 {
1742         return workArea(currentIndex());
1743 }
1744
1745
1746 GuiWorkArea * TabWorkArea::workArea(Buffer & buffer) const
1747 {
1748         // FIXME: this method doesn't work if we have more than one work area
1749         // showing the same buffer.
1750         for (int i = 0; i != count(); ++i) {
1751                 GuiWorkArea * wa = workArea(i);
1752                 LASSERT(wa, return 0);
1753                 if (&wa->bufferView().buffer() == &buffer)
1754                         return wa;
1755         }
1756         return 0;
1757 }
1758
1759
1760 void TabWorkArea::closeAll()
1761 {
1762         while (count()) {
1763                 QWidget * wac = widget(0);
1764                 LASSERT(wac, return);
1765                 removeTab(0);
1766                 delete wac;
1767         }
1768 }
1769
1770
1771 int TabWorkArea::indexOfWorkArea(GuiWorkArea * w) const
1772 {
1773         for (int index = 0; index < count(); ++index)
1774                 if (workArea(index) == w)
1775                         return index;
1776         return -1;
1777 }
1778
1779
1780 bool TabWorkArea::setCurrentWorkArea(GuiWorkArea * work_area)
1781 {
1782         LASSERT(work_area, return false);
1783         int index = indexOfWorkArea(work_area);
1784         if (index == -1)
1785                 return false;
1786
1787         if (index == currentIndex())
1788                 // Make sure the work area is up to date.
1789                 on_currentTabChanged(index);
1790         else
1791                 // Switch to the work area.
1792                 setCurrentIndex(index);
1793         work_area->setFocus();
1794
1795         return true;
1796 }
1797
1798
1799 GuiWorkArea * TabWorkArea::addWorkArea(Buffer & buffer, GuiView & view)
1800 {
1801         GuiWorkArea * wa = new GuiWorkArea(buffer, view);
1802         GuiWorkAreaContainer * wac = new GuiWorkAreaContainer(wa);
1803         wa->setUpdatesEnabled(false);
1804         // Hide tabbar if there's no tab (avoid a resize and a flashing tabbar
1805         // when hiding it again below).
1806         if (!(currentWorkArea() && currentWorkArea()->isFullScreen()))
1807                 showBar(count() > 0);
1808         addTab(wac, wa->windowTitle());
1809         QObject::connect(wa, SIGNAL(titleChanged(GuiWorkArea *)),
1810                 this, SLOT(updateTabTexts()));
1811         if (currentWorkArea() && currentWorkArea()->isFullScreen())
1812                 setFullScreen(true);
1813         else
1814                 // Hide tabbar if there's only one tab.
1815                 showBar(count() > 1);
1816
1817         updateTabTexts();
1818
1819         return wa;
1820 }
1821
1822
1823 bool TabWorkArea::removeWorkArea(GuiWorkArea * work_area)
1824 {
1825         LASSERT(work_area, return false);
1826         int index = indexOfWorkArea(work_area);
1827         if (index == -1)
1828                 return false;
1829
1830         work_area->setUpdatesEnabled(false);
1831         QWidget * wac = widget(index);
1832         removeTab(index);
1833         delete wac;
1834
1835         if (count()) {
1836                 // make sure the next work area is enabled.
1837                 currentWidget()->setUpdatesEnabled(true);
1838                 if (currentWorkArea() && currentWorkArea()->isFullScreen())
1839                         setFullScreen(true);
1840                 else
1841                         // Show tabbar only if there's more than one tab.
1842                         showBar(count() > 1);
1843         } else
1844                 lastWorkAreaRemoved();
1845
1846         updateTabTexts();
1847
1848         return true;
1849 }
1850
1851
1852 void TabWorkArea::on_currentTabChanged(int i)
1853 {
1854         // returns e.g. on application destruction
1855         if (i == -1)
1856                 return;
1857         GuiWorkArea * wa = workArea(i);
1858         LASSERT(wa, return);
1859         wa->setUpdatesEnabled(true);
1860         wa->scheduleRedraw(true);
1861         wa->setFocus();
1862         ///
1863         currentWorkAreaChanged(wa);
1864
1865         LYXERR(Debug::GUI, "currentTabChanged " << i
1866                 << " File: " << wa->bufferView().buffer().absFileName());
1867 }
1868
1869
1870 void TabWorkArea::closeCurrentBuffer()
1871 {
1872         GuiWorkArea * wa;
1873         if (clicked_tab_ == -1)
1874                 wa = currentWorkArea();
1875         else {
1876                 wa = workArea(clicked_tab_);
1877                 LASSERT(wa, return);
1878         }
1879         wa->view().closeWorkArea(wa);
1880 }
1881
1882
1883 void TabWorkArea::hideCurrentTab()
1884 {
1885         GuiWorkArea * wa;
1886         if (clicked_tab_ == -1)
1887                 wa = currentWorkArea();
1888         else {
1889                 wa = workArea(clicked_tab_);
1890                 LASSERT(wa, return);
1891         }
1892         wa->view().hideWorkArea(wa);
1893 }
1894
1895
1896 void TabWorkArea::closeTab(int index)
1897 {
1898         on_currentTabChanged(index);
1899         GuiWorkArea * wa;
1900         if (index == -1)
1901                 wa = currentWorkArea();
1902         else {
1903                 wa = workArea(index);
1904                 LASSERT(wa, return);
1905         }
1906         wa->view().closeWorkArea(wa);
1907 }
1908
1909
1910 ///
1911 class DisplayPath {
1912 public:
1913         /// make vector happy
1914         DisplayPath() : tab_(-1), dottedPrefix_(false) {}
1915         ///
1916         DisplayPath(int tab, FileName const & filename)
1917                 : tab_(tab)
1918         {
1919                 filename_ = (filename.extension() == "lyx") ?
1920                         toqstr(filename.onlyFileNameWithoutExt())
1921                         : toqstr(filename.onlyFileName());
1922                 postfix_ = toqstr(filename.absoluteFilePath()).
1923                         split("/", QString::SkipEmptyParts);
1924                 postfix_.pop_back();
1925                 abs_ = toqstr(filename.absoluteFilePath());
1926                 dottedPrefix_ = false;
1927         }
1928
1929         /// Absolute path for debugging.
1930         QString abs() const
1931         {
1932                 return abs_;
1933         }
1934         /// Add the first segment from the postfix or three dots to the prefix.
1935         /// Merge multiple dot tripples. In fact dots are added lazily, i.e. only
1936         /// when really needed.
1937         void shiftPathSegment(bool dotted)
1938         {
1939                 if (postfix_.count() <= 0)
1940                         return;
1941
1942                 if (!dotted) {
1943                         if (dottedPrefix_ && !prefix_.isEmpty())
1944                                 prefix_ += ellipsisSlash_;
1945                         prefix_ += postfix_.front() + "/";
1946                 }
1947                 dottedPrefix_ = dotted && !prefix_.isEmpty();
1948                 postfix_.pop_front();
1949         }
1950         ///
1951         QString displayString() const
1952         {
1953                 if (prefix_.isEmpty())
1954                         return filename_;
1955
1956                 bool dots = dottedPrefix_ || !postfix_.isEmpty();
1957                 return prefix_ + (dots ? ellipsisSlash_ : "") + filename_;
1958         }
1959         ///
1960         QString forecastPathString() const
1961         {
1962                 if (postfix_.count() == 0)
1963                         return displayString();
1964
1965                 return prefix_
1966                         + (dottedPrefix_ ? ellipsisSlash_ : "")
1967                         + postfix_.front() + "/";
1968         }
1969         ///
1970         bool final() const { return postfix_.empty(); }
1971         ///
1972         int tab() const { return tab_; }
1973
1974 private:
1975         /// ".../"
1976         static QString const ellipsisSlash_;
1977         ///
1978         QString prefix_;
1979         ///
1980         QStringList postfix_;
1981         ///
1982         QString filename_;
1983         ///
1984         QString abs_;
1985         ///
1986         int tab_;
1987         ///
1988         bool dottedPrefix_;
1989 };
1990
1991
1992 QString const DisplayPath::ellipsisSlash_ = QString(QChar(0x2026)) + "/";
1993
1994
1995 ///
1996 bool operator<(DisplayPath const & a, DisplayPath const & b)
1997 {
1998         return a.displayString() < b.displayString();
1999 }
2000
2001 ///
2002 bool operator==(DisplayPath const & a, DisplayPath const & b)
2003 {
2004         return a.displayString() == b.displayString();
2005 }
2006
2007
2008 void TabWorkArea::updateTabTexts()
2009 {
2010         size_t n = count();
2011         if (n == 0)
2012                 return;
2013         std::list<DisplayPath> paths;
2014         typedef std::list<DisplayPath>::iterator It;
2015
2016         // collect full names first: path into postfix, empty prefix and
2017         // filename without extension
2018         for (size_t i = 0; i < n; ++i) {
2019                 GuiWorkArea * i_wa = workArea(i);
2020                 FileName const fn = i_wa->bufferView().buffer().fileName();
2021                 paths.push_back(DisplayPath(i, fn));
2022         }
2023
2024         // go through path segments and see if it helps to make the path more unique
2025         bool somethingChanged = true;
2026         bool allFinal = false;
2027         while (somethingChanged && !allFinal) {
2028                 // adding path segments changes order
2029                 paths.sort();
2030
2031                 LYXERR(Debug::GUI, "updateTabTexts() iteration start");
2032                 somethingChanged = false;
2033                 allFinal = true;
2034
2035                 // find segments which are not unique (i.e. non-atomic)
2036                 It it = paths.begin();
2037                 It segStart = it;
2038                 QString segString = it->displayString();
2039                 for (; it != paths.end(); ++it) {
2040                         // look to the next item
2041                         It next = it;
2042                         ++next;
2043
2044                         // final?
2045                         allFinal = allFinal && it->final();
2046
2047                         LYXERR(Debug::GUI, "it = " << it->abs()
2048                                << " => " << it->displayString());
2049
2050                         // still the same segment?
2051                         QString nextString;
2052                         if ((next != paths.end()
2053                              && (nextString = next->displayString()) == segString))
2054                                 continue;
2055                         LYXERR(Debug::GUI, "segment ended");
2056
2057                         // only a trivial one with one element?
2058                         if (it == segStart) {
2059                                 // start new segment
2060                                 segStart = next;
2061                                 segString = nextString;
2062                                 continue;
2063                         }
2064
2065                         // We found a non-atomic segment
2066                         // We know that segStart <= it < next <= paths.end().
2067                         // The assertion below tells coverity about it.
2068                         LATTEST(segStart != paths.end());
2069                         QString dspString = segStart->forecastPathString();
2070                         LYXERR(Debug::GUI, "first forecast found for "
2071                                << segStart->abs() << " => " << dspString);
2072                         It sit = segStart;
2073                         ++sit;
2074                         // Shift path segments and hope for the best
2075                         // that it makes the path more unique.
2076                         somethingChanged = true;
2077                         bool moreUnique = false;
2078                         for (; sit != next; ++sit) {
2079                                 if (sit->forecastPathString() != dspString) {
2080                                         LYXERR(Debug::GUI, "different forecast found for "
2081                                                 << sit->abs() << " => " << sit->forecastPathString());
2082                                         moreUnique = true;
2083                                         break;
2084                                 }
2085                                 LYXERR(Debug::GUI, "same forecast found for "
2086                                         << sit->abs() << " => " << dspString);
2087                         }
2088
2089                         // if the path segment helped, add it. Otherwise add dots
2090                         bool dots = !moreUnique;
2091                         LYXERR(Debug::GUI, "using dots = " << dots);
2092                         for (sit = segStart; sit != next; ++sit) {
2093                                 sit->shiftPathSegment(dots);
2094                                 LYXERR(Debug::GUI, "shifting "
2095                                         << sit->abs() << " => " << sit->displayString());
2096                         }
2097
2098                         // start new segment
2099                         segStart = next;
2100                         segString = nextString;
2101                 }
2102         }
2103
2104         // set new tab titles
2105         for (It it = paths.begin(); it != paths.end(); ++it) {
2106                 int const tab_index = it->tab();
2107                 Buffer const & buf = workArea(tab_index)->bufferView().buffer();
2108                 QString tab_text = it->displayString().replace("&", "&&");
2109                 if (!buf.fileName().empty() && !buf.isClean())
2110                         tab_text += "*";
2111                 QString tab_tooltip = it->abs();
2112                 if (buf.hasReadonlyFlag()) {
2113                         setTabIcon(tab_index, QIcon(getPixmap("images/", "emblem-readonly", "svgz,png")));
2114                         tab_tooltip = qt_("%1 (read only)").arg(tab_tooltip);
2115                 } else
2116                         setTabIcon(tab_index, QIcon());
2117                 if (buf.notifiesExternalModification()) {
2118                         QString const warn = qt_("%1 (modified externally)");
2119                         tab_tooltip = warn.arg(tab_tooltip);
2120                         tab_text += QChar(0x26a0);
2121                 }
2122                 setTabText(tab_index, tab_text);
2123                 setTabToolTip(tab_index, tab_tooltip);
2124         }
2125 }
2126
2127
2128 void TabWorkArea::showContextMenu(const QPoint & pos)
2129 {
2130         // which tab?
2131         clicked_tab_ = tabBar()->tabAt(pos);
2132         if (clicked_tab_ == -1)
2133                 return;
2134
2135         // show tab popup
2136         QMenu popup;
2137         popup.addAction(QIcon(getPixmap("images/", "hidetab", "svgz,png")),
2138                 qt_("Hide tab"), this, SLOT(hideCurrentTab()));
2139         popup.addAction(QIcon(getPixmap("images/", "closetab", "svgz,png")),
2140                 qt_("Close tab"), this, SLOT(closeCurrentBuffer()));
2141         popup.exec(tabBar()->mapToGlobal(pos));
2142
2143         clicked_tab_ = -1;
2144 }
2145
2146
2147 void TabWorkArea::moveTab(int fromIndex, int toIndex)
2148 {
2149         QWidget * w = widget(fromIndex);
2150         QIcon icon = tabIcon(fromIndex);
2151         QString text = tabText(fromIndex);
2152
2153         setCurrentIndex(fromIndex);
2154         removeTab(fromIndex);
2155         insertTab(toIndex, w, icon, text);
2156         setCurrentIndex(toIndex);
2157 }
2158
2159
2160 GuiWorkAreaContainer::GuiWorkAreaContainer(GuiWorkArea * wa, QWidget * parent)
2161         : QWidget(parent), wa_(wa)
2162 {
2163         LASSERT(wa, return);
2164         Ui::WorkAreaUi::setupUi(this);
2165         layout()->addWidget(wa);
2166         connect(wa, SIGNAL(titleChanged(GuiWorkArea *)),
2167                 this, SLOT(updateDisplay()));
2168         connect(reloadPB, SIGNAL(clicked()), this, SLOT(reload()));
2169         connect(ignorePB, SIGNAL(clicked()), this, SLOT(ignore()));
2170         setMessageColour({notificationFrame}, {reloadPB, ignorePB});
2171         updateDisplay();
2172 }
2173
2174
2175 void GuiWorkAreaContainer::updateDisplay()
2176 {
2177         Buffer const & buf = wa_->bufferView().buffer();
2178         notificationFrame->setHidden(!buf.notifiesExternalModification());
2179         QString const label = qt_("<b>The file %1 changed on disk.</b>")
2180                 .arg(toqstr(buf.fileName().displayName()));
2181         externalModificationLabel->setText(label);
2182 }
2183
2184
2185 void GuiWorkAreaContainer::dispatch(FuncRequest f) const
2186 {
2187         lyx::dispatch(FuncRequest(LFUN_BUFFER_SWITCH,
2188                                   wa_->bufferView().buffer().absFileName()));
2189         lyx::dispatch(f);
2190 }
2191
2192
2193 void GuiWorkAreaContainer::reload() const
2194 {
2195         dispatch(FuncRequest(LFUN_BUFFER_RELOAD));
2196 }
2197
2198
2199 void GuiWorkAreaContainer::ignore() const
2200 {
2201         dispatch(FuncRequest(LFUN_BUFFER_EXTERNAL_MODIFICATION_CLEAR));
2202 }
2203
2204
2205 void GuiWorkAreaContainer::mouseDoubleClickEvent(QMouseEvent * event)
2206 {
2207         // prevent TabWorkArea from opening a new buffer on double click
2208         event->accept();
2209 }
2210
2211
2212 } // namespace frontend
2213 } // namespace lyx
2214
2215 #include "moc_GuiWorkArea.cpp"