src/frontends/qt/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 + 1, bot);
 158                         else
 159                                 painter.drawLine(x, bot, x + caret_width_ + r - 1, 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_(nullptr), lyx_view_(nullptr), caret_(nullptr),
 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 regularly 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         if (full_screen && lyxrc.full_screen_scrollbar)
 412                 setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 413         else
 414                 setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
 415 }
 416
 417
 418 BufferView & GuiWorkArea::bufferView()
 419 {
 420         return *d->buffer_view_;
 421 }
 422
 423
 424 BufferView const & GuiWorkArea::bufferView() const
 425 {
 426         return *d->buffer_view_;
 427 }
 428
 429
 430 void GuiWorkArea::stopBlinkingCaret()
 431 {
 432         d->caret_timeout_.stop();
 433         d->hideCaret();
 434 }
 435
 436
 437 void GuiWorkArea::startBlinkingCaret()
 438 {
 439         // do not show the cursor if the view is busy
 440         if (view().busy())
 441                 return;
 442
 443         // Don't start blinking if the cursor isn't on screen, unless we
 444         // are not ready to know whether the cursor is on screen.
 445         if (!d->buffer_view_->buffer().undo().activeUndoGroup()
 446             && !d->buffer_view_->caretInView())
 447                 return;
 448
 449         d->showCaret();
 450
 451         // Avoid blinking when debugging PAINTING, since it creates too much noise
 452         if (!lyxerr.debugging(Debug::PAINTING)) {
 453                 // we are not supposed to cache this value.
 454                 int const time = QApplication::cursorFlashTime() / 2;
 455                 if (time <= 0)
 456                         return;
 457                 d->caret_timeout_.setInterval(time);
 458                 d->caret_timeout_.start();
 459         }
 460 }
 461
 462
 463 void GuiWorkArea::toggleCaret()
 464 {
 465         if (d->caret_visible_)
 466                 d->hideCaret();
 467         else
 468                 d->showCaret();
 469 }
 470
 471
 472 void GuiWorkArea::scheduleRedraw(bool update_metrics)
 473 {
 474         if (!isVisible())
 475                 // No need to redraw in this case.
 476                 return;
 477
 478         // No need to do anything if this is the current view. The BufferView
 479         // metrics are already up to date.
 480         if (update_metrics || d->lyx_view_ != guiApp->currentView()
 481                 || d->lyx_view_->currentWorkArea() != this) {
 482                 // FIXME: it would be nice to optimize for the off-screen case.
 483                 d->buffer_view_->cursor().fixIfBroken();
 484                 d->buffer_view_->updateMetrics();
 485                 d->buffer_view_->cursor().fixIfBroken();
 486         }
 487
 488         // update caret position, because otherwise it has to wait until
 489         // the blinking interval is over
 490         d->updateCaretGeometry();
 491
 492         LYXERR(Debug::WORKAREA, "WorkArea::redraw screen");
 493         viewport()->update();
 494
 495         /// FIXME: is this still true now that paintEvent does the actual painting?
 496         /// \warning: scrollbar updating *must* be done after the BufferView is drawn
 497         /// because \c BufferView::updateScrollbar() is called in \c BufferView::draw().
 498         d->updateScrollbar();
 499         d->lyx_view_->updateStatusBar();
 500
 501         if (lyxerr.debugging(Debug::WORKAREA))
 502                 d->buffer_view_->coordCache().dump();
 503
 504         updateWindowTitle();
 505
 506         d->updateCursorShape();
 507 }
 508
 509
 510 // Keep in sync with GuiWorkArea::processKeySym below
 511 bool GuiWorkArea::queryKeySym(KeySymbol const & key, KeyModifier mod) const
 512 {
 513         return guiApp->queryKeySym(key, mod);
 514 }
 515
 516
 517 // Keep in sync with GuiWorkArea::queryKeySym above
 518 void GuiWorkArea::processKeySym(KeySymbol const & key, KeyModifier mod)
 519 {
 520         if (d->lyx_view_->isFullScreen() && d->lyx_view_->menuBar()->isVisible()
 521                 && lyxrc.full_screen_menubar) {
 522                 // FIXME HACK: we should not have to do this here. See related comment
 523                 // in GuiView::event() (QEvent::ShortcutOverride)
 524                 d->lyx_view_->menuBar()->hide();
 525         }
 526
 527         // In order to avoid bad surprise in the middle of an operation,
 528         // we better stop the blinking caret...
 529         // the caret gets restarted in GuiView::restartCaret()
 530         stopBlinkingCaret();
 531         guiApp->processKeySym(key, mod);
 532 }
 533
 534
 535 void GuiWorkArea::Private::dispatch(FuncRequest const & cmd)
 536 {
 537         // Handle drag&drop
 538         if (cmd.action() == LFUN_FILE_OPEN) {
 539                 DispatchResult dr;
 540                 lyx_view_->dispatch(cmd, dr);
 541                 return;
 542         }
 543
 544         bool const notJustMovingTheMouse =
 545                 cmd.action() != LFUN_MOUSE_MOTION || cmd.button() != mouse_button::none;
 546
 547         // In order to avoid bad surprise in the middle of an operation, we better stop
 548         // the blinking caret.
 549         if (notJustMovingTheMouse)
 550                 p->stopBlinkingCaret();
 551
 552         buffer_view_->mouseEventDispatch(cmd);
 553
 554         // Skip these when selecting
 555         // FIXME: let GuiView take care of those.
 556         if (cmd.action() != LFUN_MOUSE_MOTION) {
 557                 completer_->updateVisibility(false, false);
 558                 lyx_view_->updateDialogs();
 559                 lyx_view_->updateStatusBar();
 560         }
 561
 562         // GUI tweaks except with mouse motion with no button pressed.
 563         if (notJustMovingTheMouse) {
 564                 // Slight hack: this is only called currently when we
 565                 // clicked somewhere, so we force through the display
 566                 // of the new status here.
 567                 // FIXME: let GuiView take care of those.
 568                 lyx_view_->clearMessage();
 569
 570                 // Show the caret immediately after any operation
 571                 p->startBlinkingCaret();
 572         }
 573
 574         updateCursorShape();
 575 }
 576
 577
 578 void GuiWorkArea::Private::resizeBufferView()
 579 {
 580         // WARNING: Please don't put any code that will trigger a repaint here!
 581         // We are already inside a paint event.
 582         p->stopBlinkingCaret();
 583         // Warn our container (GuiView).
 584         p->busy(true);
 585
 586         bool const caret_in_view = buffer_view_->caretInView();
 587         buffer_view_->resize(p->viewport()->width(), p->viewport()->height());
 588         if (caret_in_view)
 589                 buffer_view_->scrollToCursor();
 590         updateCaretGeometry();
 591
 592         // Update scrollbars which might have changed due different
 593         // BufferView dimension. This is especially important when the
 594         // BufferView goes from zero-size to the real-size for the first time,
 595         // as the scrollbar parameters are then set for the first time.
 596         updateScrollbar();
 597
 598         need_resize_ = false;
 599         p->busy(false);
 600         // Eventually, restart the caret after the resize event.
 601         // We might be resizing even if the focus is on another widget so we only
 602         // restart the caret if we have the focus.
 603         if (p->hasFocus())
 604                 QTimer::singleShot(50, p, SLOT(startBlinkingCaret()));
 605 }
 606
 607
 608 void GuiWorkArea::Private::updateCaretGeometry()
 609 {
 610         // we cannot update geometry if not ready and we do not need to if
 611         // caret is not in view.
 612         if (buffer_view_->buffer().undo().activeUndoGroup()
 613             || !buffer_view_->caretInView())
 614                 return;
 615
 616         Point point;
 617         int h = 0;
 618         buffer_view_->caretPosAndHeight(point, h);
 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 = 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 #if (QT_VERSION > QT_VERSION_CHECK(5,10,1))
 853         d->synthetic_mouse_event_.cmd = cmd; // QtBug QAbstractScrollArea::mouseMoveEvent
 854 #endif
 855         d->dispatch(cmd);
 856         e->accept();
 857 }
 858
 859
 860 void GuiWorkArea::mouseMoveEvent(QMouseEvent * e)
 861 {
 862 #if (QT_VERSION > QT_VERSION_CHECK(5,10,1))
 863         // cancel the event if the coordinates didn't change, this is due to QtBug
 864         // QAbstractScrollArea::mouseMoveEvent, the event is triggered falsely when quickly
 865         // double tapping a touchpad. To test: try to select a word by quickly double tapping
 866         // on a touchpad while hovering the cursor over that word in the work area.
 867         // This bug does not occur on Qt versions 5.10.1 and below. Only Windows seems to be affected.
 868         // ML thread: https://www.mail-archive.com/lyx-devel@lists.lyx.org/msg211699.html
 869         // Qt bugtracker: https://bugreports.qt.io/browse/QTBUG-85431
 870         if (e->x() == d->synthetic_mouse_event_.cmd.x() && // QtBug QAbstractScrollArea::mouseMoveEvent
 871                         e->y() == d->synthetic_mouse_event_.cmd.y()) // QtBug QAbstractScrollArea::mouseMoveEvent
 872                 return; // QtBug QAbstractScrollArea::mouseMoveEvent
 873 #endif
 874
 875         // we kill the triple click if we move
 876         doubleClickTimeout();
 877         FuncRequest cmd(LFUN_MOUSE_MOTION, e->x(), e->y(),
 878                         q_motion_state(e->buttons()), q_key_state(e->modifiers()));
 879
 880         e->accept();
 881
 882         // If we're above or below the work area...
 883         if ((e->y() <= 20 || e->y() >= viewport()->height() - 20)
 884                         && e->buttons() == mouse_button::button1) {
 885                 // Make sure only a synthetic event can cause a page scroll,
 886                 // so they come at a steady rate:
 887                 if (e->y() <= 20)
 888                         // _Force_ a scroll up:
 889                         cmd.set_y(e->y() - 21);
 890                 else
 891                         cmd.set_y(e->y() + 21);
 892                 // Store the event, to be handled when the timeout expires.
 893                 d->synthetic_mouse_event_.cmd = cmd;
 894
 895                 if (d->synthetic_mouse_event_.timeout.running()) {
 896                         // Discard the event. Note that it _may_ be handled
 897                         // when the timeout expires if
 898                         // synthetic_mouse_event_.cmd has not been overwritten.
 899                         // Ie, when the timeout expires, we handle the
 900                         // most recent event but discard all others that
 901                         // occurred after the one used to start the timeout
 902                         // in the first place.
 903                         return;
 904                 }
 905
 906                 d->synthetic_mouse_event_.restart_timeout = true;
 907                 d->synthetic_mouse_event_.timeout.start();
 908                 // Fall through to handle this event...
 909
 910         } else if (d->synthetic_mouse_event_.timeout.running()) {
 911                 // Store the event, to be possibly handled when the timeout
 912                 // expires.
 913                 // Once the timeout has expired, normal control is returned
 914                 // to mouseMoveEvent (restart_timeout = false).
 915                 // This results in a much smoother 'feel' when moving the
 916                 // mouse back into the work area.
 917                 d->synthetic_mouse_event_.cmd = cmd;
 918                 d->synthetic_mouse_event_.restart_timeout = false;
 919                 return;
 920         }
 921         d->dispatch(cmd);
 922 }
 923
 924
 925 void GuiWorkArea::wheelEvent(QWheelEvent * ev)
 926 {
 927         // Wheel rotation by one notch results in a delta() of 120 (see
 928         // documentation of QWheelEvent)
 929         // But first we have to ignore horizontal scroll events.
 930 #if QT_VERSION < 0x050000
 931         if (ev->orientation() == Qt::Horizontal) {
 932                 ev->accept();
 933                 return;
 934         }
 935         double const delta = ev->delta() / 120.0;
 936 #else
 937         QPoint const aDelta = ev->angleDelta();
 938         // skip horizontal wheel event
 939         if (abs(aDelta.x()) > abs(aDelta.y())) {
 940                 ev->accept();
 941                 return;
 942         }
 943         double const delta = aDelta.y() / 120.0;
 944 #endif
 945
 946         bool zoom = false;
 947         switch (lyxrc.scroll_wheel_zoom) {
 948         case LyXRC::SCROLL_WHEEL_ZOOM_CTRL:
 949                 zoom = ev->modifiers() & Qt::ControlModifier;
 950                 zoom &= !(ev->modifiers() & (Qt::ShiftModifier | Qt::AltModifier));
 951                 break;
 952         case LyXRC::SCROLL_WHEEL_ZOOM_SHIFT:
 953                 zoom = ev->modifiers() & Qt::ShiftModifier;
 954                 zoom &= !(ev->modifiers() & (Qt::ControlModifier | Qt::AltModifier));
 955                 break;
 956         case LyXRC::SCROLL_WHEEL_ZOOM_ALT:
 957                 zoom = ev->modifiers() & Qt::AltModifier;
 958                 zoom &= !(ev->modifiers() & (Qt::ShiftModifier | Qt::ControlModifier));
 959                 break;
 960         case LyXRC::SCROLL_WHEEL_ZOOM_OFF:
 961                 break;
 962         }
 963         if (zoom) {
 964                 docstring arg = convert<docstring>(int(5 * delta));
 965                 lyx::dispatch(FuncRequest(LFUN_BUFFER_ZOOM_IN, arg));
 966                 return;
 967         }
 968
 969         // Take into account the desktop wide settings.
 970         int const lines = qApp->wheelScrollLines();
 971         int const page_step = verticalScrollBar()->pageStep();
 972         // Test if the wheel mouse is set to one screen at a time.
 973         // This is according to
 974         // https://doc.qt.io/qt-5/qapplication.html#wheelScrollLines-prop
 975         int scroll_value =
 976                 min(lines * verticalScrollBar()->singleStep(), page_step);
 977
 978         // Take into account the rotation and the user preferences.
 979         scroll_value = int(scroll_value * delta * lyxrc.mouse_wheel_speed);
 980         LYXERR(Debug::SCROLLING, "wheelScrollLines = " << lines
 981                         << " delta = " << delta << " scroll_value = " << scroll_value
 982                         << " page_step = " << page_step);
 983         // Now scroll.
 984         verticalScrollBar()->setValue(verticalScrollBar()->value() - scroll_value);
 985
 986         ev->accept();
 987 }
 988
 989
 990 void GuiWorkArea::generateSyntheticMouseEvent()
 991 {
 992         int const e_y = d->synthetic_mouse_event_.cmd.y();
 993         int const wh = d->buffer_view_->workHeight();
 994         bool const up = e_y < 0;
 995         bool const down = e_y > wh;
 996
 997         // Set things off to generate the _next_ 'pseudo' event.
 998         int step = 50;
 999         if (d->synthetic_mouse_event_.restart_timeout) {
1000                 // This is some magic formulae to determine the speed
1001                 // of scrolling related to the position of the mouse.
1002                 int time = 200;
1003                 if (up || down) {
1004                         int dist = up ? -e_y : e_y - wh;
1005                         time = max(min(200, 250000 / (dist * dist)), 1) ;
1006
1007                         if (time < 40) {
1008                                 step = 80000 / (time * time);
1009                                 time = 40;
1010                         }
1011                 }
1012                 d->synthetic_mouse_event_.timeout.setTimeout(time);
1013                 d->synthetic_mouse_event_.timeout.start();
1014         }
1015
1016         // Can we scroll further ?
1017         int const value = verticalScrollBar()->value();
1018         if (value == verticalScrollBar()->maximum()
1019                   || value == verticalScrollBar()->minimum()) {
1020                 d->synthetic_mouse_event_.timeout.stop();
1021                 return;
1022         }
1023
1024         // Scroll
1025         if (step <= 2 * wh) {
1026                 d->buffer_view_->scroll(up ? -step : step);
1027                 d->buffer_view_->updateMetrics();
1028         } else {
1029                 d->buffer_view_->scrollDocView(value + (up ? -step : step), false);
1030         }
1031
1032         // In which paragraph do we have to set the cursor ?
1033         Cursor & cur = d->buffer_view_->cursor();
1034         // FIXME: we don't know how to handle math.
1035         Text * text = cur.text();
1036         if (!text)
1037                 return;
1038         TextMetrics const & tm = d->buffer_view_->textMetrics(text);
1039
1040         // Quit gracefully if there are no metrics, since otherwise next
1041         // line would crash (bug #10324).
1042         // This situation seems related to a (not yet understood) timing problem.
1043         if (tm.empty())
1044                 return;
1045
1046         pair<pit_type, const ParagraphMetrics *> pp = up ? tm.first() : tm.last();
1047         ParagraphMetrics const & pm = *pp.second;
1048         pit_type const pit = pp.first;
1049
1050         if (pm.rows().empty())
1051                 return;
1052
1053         // Find the row at which we set the cursor.
1054         RowList::const_iterator rit = pm.rows().begin();
1055         RowList::const_iterator rlast = pm.rows().end();
1056         int yy = pm.position() - pm.ascent();
1057         for (--rlast; rit != rlast; ++rit) {
1058                 int h = rit->height();
1059                 if ((up && yy + h > 0)
1060                           || (!up && yy + h > wh - defaultRowHeight()))
1061                         break;
1062                 yy += h;
1063         }
1064
1065         // Find the position of the cursor
1066         bool bound;
1067         int x = d->synthetic_mouse_event_.cmd.x();
1068         pos_type const pos = tm.getPosNearX(*rit, x, bound);
1069
1070         // Set the cursor
1071         cur.pit() = pit;
1072         cur.pos() = pos;
1073         cur.boundary(bound);
1074
1075         d->buffer_view_->buffer().changed(false);
1076         return;
1077 }
1078
1079
1080 // CompressorProxy adapted from Kuba Ober https://stackoverflow.com/a/21006207
1081 CompressorProxy::CompressorProxy(GuiWorkArea * wa) : QObject(wa), flag_(false)
1082 {
1083         qRegisterMetaType<KeySymbol>("KeySymbol");
1084         qRegisterMetaType<KeyModifier>("KeyModifier");
1085         connect(wa, SIGNAL(compressKeySym(KeySymbol, KeyModifier, bool)),
1086                 this, SLOT(slot(KeySymbol, KeyModifier, bool)),
1087                 Qt::QueuedConnection);
1088         connect(this, SIGNAL(signal(KeySymbol, KeyModifier)),
1089                 wa, SLOT(processKeySym(KeySymbol, KeyModifier)));
1090 }
1091
1092
1093 bool CompressorProxy::emitCheck(bool isAutoRepeat)
1094 {
1095         flag_ = true;
1096         if (isAutoRepeat)
1097                 QCoreApplication::sendPostedEvents(this, QEvent::MetaCall); // recurse
1098         bool result = flag_;
1099         flag_ = false;
1100         return result;
1101 }
1102
1103
1104 void CompressorProxy::slot(KeySymbol sym, KeyModifier mod, bool isAutoRepeat)
1105 {
1106         if (emitCheck(isAutoRepeat))
1107                 Q_EMIT signal(sym, mod);
1108         else
1109                 LYXERR(Debug::KEY, "system is busy: autoRepeat key event ignored");
1110 }
1111
1112
1113 void GuiWorkArea::keyPressEvent(QKeyEvent * ev)
1114 {
1115         // this is also called for ShortcutOverride events. In this case, one must
1116         // not act but simply accept the event explicitly.
1117         bool const act = (ev->type() != QEvent::ShortcutOverride);
1118
1119         // Do not process here some keys if dialog_mode_ is set
1120         bool const for_dialog_mode = d->dialog_mode_
1121                 && (ev->modifiers() == Qt::NoModifier
1122                     || ev->modifiers() == Qt::ShiftModifier)
1123                 && (ev->key() == Qt::Key_Escape
1124                     || ev->key() == Qt::Key_Enter
1125                     || ev->key() == Qt::Key_Return);
1126         // also do not use autoRepeat to input shortcuts
1127         bool const autoRepeat = ev->isAutoRepeat();
1128
1129         if (for_dialog_mode || (!act && autoRepeat)) {
1130                 ev->ignore();
1131                 return;
1132         }
1133
1134         // intercept some keys if completion popup is visible
1135         if (d->completer_->popupVisible()) {
1136                 switch (ev->key()) {
1137                 case Qt::Key_Enter:
1138                 case Qt::Key_Return:
1139                         if (act)
1140                                 d->completer_->activate();
1141                         ev->accept();
1142                         return;
1143                 }
1144         }
1145
1146         KeyModifier const m = q_key_state(ev->modifiers());
1147
1148         if (act && lyxerr.debugging(Debug::KEY)) {
1149                 std::string str;
1150                 if (m & ShiftModifier)
1151                         str += "Shift-";
1152                 if (m & ControlModifier)
1153                         str += "Control-";
1154                 if (m & AltModifier)
1155                         str += "Alt-";
1156                 if (m & MetaModifier)
1157                         str += "Meta-";
1158                 LYXERR(Debug::KEY, " count: " << ev->count() << " text: " << ev->text()
1159                        << " isAutoRepeat: " << ev->isAutoRepeat() << " key: " << ev->key()
1160                        << " keyState: " << str);
1161         }
1162
1163         KeySymbol sym;
1164         setKeySymbol(&sym, ev);
1165         if (sym.isOK()) {
1166                 if (act) {
1167                         Q_EMIT compressKeySym(sym, m, autoRepeat);
1168                         ev->accept();
1169                 } else
1170                         // here, !autoRepeat, as determined at the beginning
1171                         ev->setAccepted(queryKeySym(sym, m));
1172         } else {
1173                 ev->ignore();
1174         }
1175 }
1176
1177
1178 void GuiWorkArea::doubleClickTimeout()
1179 {
1180         d->dc_event_.active = false;
1181 }
1182
1183
1184 void GuiWorkArea::mouseDoubleClickEvent(QMouseEvent * ev)
1185 {
1186         d->dc_event_ = DoubleClick(ev);
1187         QTimer::singleShot(QApplication::doubleClickInterval(), this,
1188                         SLOT(doubleClickTimeout()));
1189         FuncRequest cmd(LFUN_MOUSE_DOUBLE, ev->x(), ev->y(),
1190                         q_button_state(ev->button()), q_key_state(ev->modifiers()));
1191         d->dispatch(cmd);
1192         ev->accept();
1193 }
1194
1195
1196 void GuiWorkArea::resizeEvent(QResizeEvent * ev)
1197 {
1198         QAbstractScrollArea::resizeEvent(ev);
1199         d->need_resize_ = true;
1200         ev->accept();
1201 }
1202
1203
1204 void GuiWorkArea::Private::paintPreeditText(GuiPainter & pain)
1205 {
1206         if (preedit_string_.empty())
1207                 return;
1208
1209         // FIXME: shall we use real_current_font here? (see #10478)
1210         FontInfo const font = buffer_view_->cursor().getFont().fontInfo();
1211         FontMetrics const & fm = theFontMetrics(font);
1212         int const height = fm.maxHeight();
1213         int cur_x = caret_->rect().left();
1214         int cur_y = caret_->rect().bottom();
1215
1216         // get attributes of input method cursor.
1217         // cursor_pos : cursor position in preedit string.
1218         size_t cursor_pos = 0;
1219         bool cursor_is_visible = false;
1220         for (auto const & attr : preedit_attr_) {
1221                 if (attr.type == QInputMethodEvent::Cursor) {
1222                         cursor_pos = size_t(attr.start);
1223                         cursor_is_visible = attr.length != 0;
1224                         break;
1225                 }
1226         }
1227
1228         size_t const preedit_length = preedit_string_.length();
1229
1230         // get position of selection in input method.
1231         // FIXME: isn't there a simpler way to do this?
1232         // rStart : cursor position in selected string in IM.
1233         size_t rStart = 0;
1234         // rLength : selected string length in IM.
1235         size_t rLength = 0;
1236         if (cursor_pos < preedit_length) {
1237                 for (auto const & attr : preedit_attr_) {
1238                         if (attr.type == QInputMethodEvent::TextFormat) {
1239                                 if (attr.start <= int(cursor_pos)
1240                                         && int(cursor_pos) < attr.start + attr.length) {
1241                                                 rStart = size_t(attr.start);
1242                                                 rLength = size_t(attr.length);
1243                                                 if (!cursor_is_visible)
1244                                                         cursor_pos += rLength;
1245                                                 break;
1246                                 }
1247                         }
1248                 }
1249         }
1250         else {
1251                 rStart = cursor_pos;
1252                 rLength = 0;
1253         }
1254
1255         int const right_margin = buffer_view_->rightMargin();
1256         Painter::preedit_style ps;
1257         // Most often there would be only one line:
1258         preedit_lines_ = 1;
1259         for (size_t pos = 0; pos != preedit_length; ++pos) {
1260                 char_type const typed_char = preedit_string_[pos];
1261                 // reset preedit string style
1262                 ps = Painter::preedit_default;
1263
1264                 // if we reached the right extremity of the screen, go to next line.
1265                 if (cur_x + fm.width(typed_char) > p->viewport()->width() - right_margin) {
1266                         cur_x = right_margin;
1267                         cur_y += height + 1;
1268                         ++preedit_lines_;
1269                 }
1270                 // preedit strings are displayed with dashed underline
1271                 // and partial strings are displayed white on black indicating
1272                 // that we are in selecting mode in the input method.
1273                 // FIXME: rLength == preedit_length is not a changing condition
1274                 // FIXME: should be put out of the loop.
1275                 if (pos >= rStart
1276                         && pos < rStart + rLength
1277                         && !(cursor_pos < rLength && rLength == preedit_length))
1278                         ps = Painter::preedit_selecting;
1279
1280                 if (pos == cursor_pos
1281                         && (cursor_pos < rLength && rLength == preedit_length))
1282                         ps = Painter::preedit_cursor;
1283
1284                 // draw one character and update cur_x.
1285                 cur_x += pain.preeditText(cur_x, cur_y, typed_char, font, ps);
1286         }
1287 }
1288
1289
1290 void GuiWorkArea::Private::resetScreen()
1291 {
1292         if (use_backingstore_) {
1293                 int const pr = p->pixelRatio();
1294                 screen_ = QImage(static_cast<int>(pr * p->viewport()->width()),
1295                                  static_cast<int>(pr * p->viewport()->height()),
1296                                  QImage::Format_ARGB32_Premultiplied);
1297 #  if QT_VERSION >= 0x050000
1298                 screen_.setDevicePixelRatio(pr);
1299 #  endif
1300         }
1301 }
1302
1303
1304 QPaintDevice * GuiWorkArea::Private::screenDevice()
1305 {
1306         if (use_backingstore_)
1307                 return &screen_;
1308         else
1309                 return p->viewport();
1310 }
1311
1312
1313 void GuiWorkArea::Private::updateScreen(QRectF const & rc)
1314 {
1315         if (use_backingstore_) {
1316                 QPainter qpain(p->viewport());
1317                 double const pr = p->pixelRatio();
1318                 QRectF const rcs = QRectF(rc.x() * pr, rc.y() * pr,
1319                                           rc.width() * pr, rc.height() * pr);
1320                 qpain.drawImage(rc, screen_, rcs);
1321         }
1322 }
1323
1324
1325 void GuiWorkArea::paintEvent(QPaintEvent * ev)
1326 {
1327         // Do not trigger the painting machinery if we are not ready (see
1328         // bug #10989). The second test triggers when in the middle of a
1329         // dispatch operation.
1330         if (view().busy() || d->buffer_view_->buffer().undo().activeUndoGroup()) {
1331                 // Since macOS has turned the screen black at this point, our
1332                 // backing store has to be copied to screen (this is a no-op
1333                 // except on macOS).
1334                 d->updateScreen(ev->rect());
1335                 // Ignore this paint event, but request a new one for later.
1336                 viewport()->update(ev->rect());
1337                 ev->accept();
1338                 return;
1339         }
1340
1341         // LYXERR(Debug::PAINTING, "paintEvent begin: x: " << rc.x()
1342         //      << " y: " << rc.y() << " w: " << rc.width() << " h: " << rc.height());
1343
1344         if (d->need_resize_ || pixelRatio() != d->last_pixel_ratio_) {
1345                 d->resetScreen();
1346                 d->resizeBufferView();
1347         }
1348
1349         d->last_pixel_ratio_ = pixelRatio();
1350
1351         GuiPainter pain(d->screenDevice(), pixelRatio(), d->lyx_view_->develMode());
1352
1353         d->buffer_view_->draw(pain, d->caret_visible_);
1354
1355         // The preedit text, if needed
1356         d->paintPreeditText(pain);
1357
1358         // and the caret
1359         if (d->caret_visible_)
1360                 d->caret_->draw(pain, d->buffer_view_->horizScrollOffset());
1361
1362         d->updateScreen(ev->rect());
1363
1364         ev->accept();
1365 }
1366
1367
1368 void GuiWorkArea::inputMethodEvent(QInputMethodEvent * e)
1369 {
1370         LYXERR(Debug::KEY, "preeditString: " << e->preeditString()
1371                    << " commitString: " << e->commitString());
1372
1373         // insert the processed text in the document (handles undo)
1374         if (!e->commitString().isEmpty()) {
1375                 FuncRequest cmd(LFUN_SELF_INSERT,
1376                                 qstring_to_ucs4(e->commitString()),
1377                                 FuncRequest::KEYBOARD);
1378                 dispatch(cmd);
1379                 // FIXME: this is supposed to remove traces from preedit
1380                 // string. Can we avoid calling it explicitly?
1381                 d->buffer_view_->updateMetrics();
1382         }
1383
1384         // Hide the caret during the test transformation.
1385         if (e->preeditString().isEmpty())
1386                 startBlinkingCaret();
1387         else
1388                 stopBlinkingCaret();
1389
1390         if (d->preedit_string_.empty() && e->preeditString().isEmpty()) {
1391                 // Nothing to do
1392                 e->accept();
1393                 return;
1394         }
1395
1396         // The preedit text and its attributes will be used in paintPreeditText
1397         d->preedit_string_ = qstring_to_ucs4(e->preeditString());
1398         d->preedit_attr_ = e->attributes();
1399
1400
1401         // redraw area of preedit string.
1402         int height = d->caret_->rect().height();
1403         int cur_y = d->caret_->rect().bottom();
1404         viewport()->update(0, cur_y - height, viewport()->width(),
1405                 (height + 1) * d->preedit_lines_);
1406
1407         if (d->preedit_string_.empty()) {
1408                 d->preedit_lines_ = 1;
1409                 e->accept();
1410                 return;
1411         }
1412
1413         // Don't forget to accept the event!
1414         e->accept();
1415 }
1416
1417
1418 QVariant GuiWorkArea::inputMethodQuery(Qt::InputMethodQuery query) const
1419 {
1420         QRect cur_r(0, 0, 0, 0);
1421         switch (query) {
1422                 // this is the CJK-specific composition window position and
1423                 // the context menu position when the menu key is pressed.
1424                 case Qt::ImMicroFocus:
1425                         cur_r = d->caret_->rect();
1426                         if (d->preedit_lines_ != 1)
1427                                 cur_r.moveLeft(10);
1428                         cur_r.moveBottom(cur_r.bottom()
1429                                 + cur_r.height() * (d->preedit_lines_ - 1));
1430                         // return lower right of caret in LyX.
1431                         return cur_r;
1432                 default:
1433                         return QWidget::inputMethodQuery(query);
1434         }
1435 }
1436
1437
1438 void GuiWorkArea::updateWindowTitle()
1439 {
1440         Buffer const & buf = bufferView().buffer();
1441         if (buf.fileName() != d->file_name_
1442             || buf.params().shell_escape != d->shell_escape_
1443             || buf.hasReadonlyFlag() != d->read_only_
1444             || buf.lyxvc().vcstatus() != d->vc_status_
1445             || buf.isClean() != d->clean_
1446             || buf.notifiesExternalModification() != d->externally_modified_) {
1447                 d->file_name_ = buf.fileName();
1448                 d->shell_escape_ = buf.params().shell_escape;
1449                 d->read_only_ = buf.hasReadonlyFlag();
1450                 d->vc_status_ = buf.lyxvc().vcstatus();
1451                 d->clean_ = buf.isClean();
1452                 d->externally_modified_ = buf.notifiesExternalModification();
1453                 Q_EMIT titleChanged(this);
1454         }
1455 }
1456
1457
1458 bool GuiWorkArea::isFullScreen() const
1459 {
1460         return d->lyx_view_ && d->lyx_view_->isFullScreen();
1461 }
1462
1463
1464 bool GuiWorkArea::inDialogMode() const
1465 {
1466         return d->dialog_mode_;
1467 }
1468
1469
1470 void GuiWorkArea::setDialogMode(bool mode)
1471 {
1472         d->dialog_mode_ = mode;
1473 }
1474
1475
1476 GuiCompleter & GuiWorkArea::completer()
1477 {
1478         return *d->completer_;
1479 }
1480
1481 GuiView const & GuiWorkArea::view() const
1482 {
1483         return *d->lyx_view_;
1484 }
1485
1486
1487 GuiView & GuiWorkArea::view()
1488 {
1489         return *d->lyx_view_;
1490 }
1491
1492 ////////////////////////////////////////////////////////////////////
1493 //
1494 // EmbeddedWorkArea
1495 //
1496 ////////////////////////////////////////////////////////////////////
1497
1498
1499 EmbeddedWorkArea::EmbeddedWorkArea(QWidget * w): GuiWorkArea(w)
1500 {
1501         support::TempFile tempfile("embedded.internal");
1502         tempfile.setAutoRemove(false);
1503         buffer_ = theBufferList().newInternalBuffer(tempfile.name().absFileName());
1504         buffer_->setUnnamed(true);
1505         buffer_->setFullyLoaded(true);
1506         setBuffer(*buffer_);
1507         setDialogMode(true);
1508 }
1509
1510
1511 EmbeddedWorkArea::~EmbeddedWorkArea()
1512 {
1513         // No need to destroy buffer and bufferview here, because it is done
1514         // in theBufferList() destruction loop at application exit
1515 }
1516
1517
1518 void EmbeddedWorkArea::closeEvent(QCloseEvent * ev)
1519 {
1520         disable();
1521         GuiWorkArea::closeEvent(ev);
1522 }
1523
1524
1525 void EmbeddedWorkArea::hideEvent(QHideEvent * ev)
1526 {
1527         disable();
1528         GuiWorkArea::hideEvent(ev);
1529 }
1530
1531
1532 QSize EmbeddedWorkArea::sizeHint () const
1533 {
1534         // FIXME(?):
1535         // GuiWorkArea sets the size to the screen's viewport
1536         // by returning a value this gets overridden
1537         // EmbeddedWorkArea is now sized to fit in the layout
1538         // of the parent, and has a minimum size set in GuiWorkArea
1539         // which is what we return here
1540         return QSize(100, 70);
1541 }
1542
1543
1544 void EmbeddedWorkArea::disable()
1545 {
1546         stopBlinkingCaret();
1547         if (view().currentWorkArea() != this)
1548                 return;
1549         // No problem if currentMainWorkArea() is 0 (setCurrentWorkArea()
1550         // tolerates it and shows the background logo), what happens if
1551         // an EmbeddedWorkArea is closed after closing all document WAs
1552         view().setCurrentWorkArea(view().currentMainWorkArea());
1553 }
1554
1555 ////////////////////////////////////////////////////////////////////
1556 //
1557 // TabWorkArea
1558 //
1559 ////////////////////////////////////////////////////////////////////
1560
1561 #ifdef Q_OS_MAC
1562 class NoTabFrameMacStyle : public QProxyStyle {
1563 public:
1564         ///
1565         QRect subElementRect(SubElement element, const QStyleOption * option,
1566                              const QWidget * widget = 0) const
1567         {
1568                 QRect rect = QProxyStyle::subElementRect(element, option, widget);
1569                 bool noBar = static_cast<QTabWidget const *>(widget)->count() <= 1;
1570
1571                 // The Qt Mac style puts the contents into a 3 pixel wide box
1572                 // which looks very ugly and not like other Mac applications.
1573                 // Hence we remove this here, and moreover the 16 pixel round
1574                 // frame above if the tab bar is hidden.
1575                 if (element == QStyle::SE_TabWidgetTabContents) {
1576                         rect.adjust(- rect.left(), 0, rect.left(), 0);
1577                         if (noBar)
1578                                 rect.setTop(0);
1579                 }
1580
1581                 return rect;
1582         }
1583 };
1584
1585 NoTabFrameMacStyle noTabFrameMacStyle;
1586 #endif
1587
1588
1589 TabWorkArea::TabWorkArea(QWidget * parent)
1590         : QTabWidget(parent), clicked_tab_(-1), midpressed_tab_(-1)
1591 {
1592 #ifdef Q_OS_MAC
1593         setStyle(&noTabFrameMacStyle);
1594 #endif
1595
1596         QPalette pal = palette();
1597         pal.setColor(QPalette::Active, QPalette::Button,
1598                 pal.color(QPalette::Active, QPalette::Window));
1599         pal.setColor(QPalette::Disabled, QPalette::Button,
1600                 pal.color(QPalette::Disabled, QPalette::Window));
1601         pal.setColor(QPalette::Inactive, QPalette::Button,
1602                 pal.color(QPalette::Inactive, QPalette::Window));
1603
1604         QObject::connect(this, SIGNAL(currentChanged(int)),
1605                 this, SLOT(on_currentTabChanged(int)));
1606
1607         closeBufferButton = new QToolButton(this);
1608         closeBufferButton->setPalette(pal);
1609         // FIXME: rename the icon to closebuffer.png
1610         closeBufferButton->setIcon(QIcon(getPixmap("images/", "closetab", "svgz,png")));
1611         closeBufferButton->setText("Close File");
1612         closeBufferButton->setAutoRaise(true);
1613         closeBufferButton->setCursor(Qt::ArrowCursor);
1614         closeBufferButton->setToolTip(qt_("Close File"));
1615         closeBufferButton->setEnabled(true);
1616         QObject::connect(closeBufferButton, SIGNAL(clicked()),
1617                 this, SLOT(closeCurrentBuffer()));
1618         setCornerWidget(closeBufferButton, Qt::TopRightCorner);
1619
1620         // set TabBar behaviour
1621         QTabBar * tb = tabBar();
1622         tb->setTabsClosable(!lyxrc.single_close_tab_button);
1623         tb->setSelectionBehaviorOnRemove(QTabBar::SelectPreviousTab);
1624         tb->setElideMode(Qt::ElideNone);
1625         // allow dragging tabs
1626         tb->setMovable(true);
1627         // make us responsible for the context menu of the tabbar
1628         tb->setContextMenuPolicy(Qt::CustomContextMenu);
1629         connect(tb, SIGNAL(customContextMenuRequested(const QPoint &)),
1630                 this, SLOT(showContextMenu(const QPoint &)));
1631         connect(tb, SIGNAL(tabCloseRequested(int)),
1632                 this, SLOT(closeTab(int)));
1633
1634         setUsesScrollButtons(true);
1635 }
1636
1637
1638 void TabWorkArea::mousePressEvent(QMouseEvent *me)
1639 {
1640         if (me->button() == Qt::MidButton)
1641                 midpressed_tab_ = tabBar()->tabAt(me->pos());
1642         else
1643                 QTabWidget::mousePressEvent(me);
1644 }
1645
1646
1647 void TabWorkArea::mouseReleaseEvent(QMouseEvent *me)
1648 {
1649         if (me->button() == Qt::MidButton) {
1650                 int const midreleased_tab = tabBar()->tabAt(me->pos());
1651                 if (midpressed_tab_ == midreleased_tab && posIsTab(me->pos()))
1652                         closeTab(midreleased_tab);
1653         } else
1654                 QTabWidget::mouseReleaseEvent(me);
1655 }
1656
1657
1658 void TabWorkArea::paintEvent(QPaintEvent * event)
1659 {
1660         if (tabBar()->isVisible()) {
1661                 QTabWidget::paintEvent(event);
1662         } else {
1663                 // Prevent the selected tab to influence the
1664                 // painting of the frame of the tab widget.
1665                 // This is needed for gtk style in Qt.
1666                 QStylePainter p(this);
1667 #if QT_VERSION < 0x050000
1668                 QStyleOptionTabWidgetFrameV2 opt;
1669 #else
1670                 QStyleOptionTabWidgetFrame opt;
1671 #endif
1672                 initStyleOption(&opt);
1673                 opt.rect = style()->subElementRect(QStyle::SE_TabWidgetTabPane,
1674                         &opt, this);
1675                 opt.selectedTabRect = QRect();
1676                 p.drawPrimitive(QStyle::PE_FrameTabWidget, opt);
1677         }
1678 }
1679
1680
1681 bool TabWorkArea::posIsTab(QPoint position)
1682 {
1683         // tabAt returns -1 if tab does not covers position
1684         return tabBar()->tabAt(position) > -1;
1685 }
1686
1687
1688 void TabWorkArea::mouseDoubleClickEvent(QMouseEvent * event)
1689 {
1690         if (event->button() != Qt::LeftButton)
1691                 return;
1692
1693         // this code chunk is unnecessary because it seems the event only makes
1694         // it this far if it is not on a tab. I'm not sure why this is (maybe
1695         // it is handled and ended in DragTabBar?), and thus I'm not sure if
1696         // this is true in all cases and if it will be true in the future so I
1697         // leave this code for now. (skostysh, 2016-07-21)
1698         //
1699         // return early if double click on existing tabs
1700         if (posIsTab(event->pos()))
1701                 return;
1702
1703         dispatch(FuncRequest(LFUN_BUFFER_NEW));
1704 }
1705
1706
1707 void TabWorkArea::setFullScreen(bool full_screen)
1708 {
1709         for (int i = 0; i != count(); ++i) {
1710                 if (GuiWorkArea * wa = workArea(i))
1711                         wa->setFullScreen(full_screen);
1712         }
1713
1714         if (lyxrc.full_screen_tabbar)
1715                 showBar(!full_screen && count() > 1);
1716         else
1717                 showBar(count() > 1);
1718 }
1719
1720
1721 void TabWorkArea::showBar(bool show)
1722 {
1723         tabBar()->setEnabled(show);
1724         tabBar()->setVisible(show);
1725         closeBufferButton->setVisible(show && lyxrc.single_close_tab_button);
1726         setTabsClosable(!lyxrc.single_close_tab_button);
1727 }
1728
1729
1730 GuiWorkAreaContainer * TabWorkArea::widget(int index) const
1731 {
1732         QWidget * w = QTabWidget::widget(index);
1733         if (!w)
1734                 return nullptr;
1735         GuiWorkAreaContainer * wac = dynamic_cast<GuiWorkAreaContainer *>(w);
1736         LATTEST(wac);
1737         return wac;
1738 }
1739
1740
1741 GuiWorkAreaContainer * TabWorkArea::currentWidget() const
1742 {
1743         return widget(currentIndex());
1744 }
1745
1746
1747 GuiWorkArea * TabWorkArea::workArea(int index) const
1748 {
1749         GuiWorkAreaContainer * w = widget(index);
1750         if (!w)
1751                 return nullptr;
1752         return w->workArea();
1753 }
1754
1755
1756 GuiWorkArea * TabWorkArea::currentWorkArea() const
1757 {
1758         return workArea(currentIndex());
1759 }
1760
1761
1762 GuiWorkArea * TabWorkArea::workArea(Buffer & buffer) const
1763 {
1764         // FIXME: this method doesn't work if we have more than one work area
1765         // showing the same buffer.
1766         for (int i = 0; i != count(); ++i) {
1767                 GuiWorkArea * wa = workArea(i);
1768                 LASSERT(wa, return nullptr);
1769                 if (&wa->bufferView().buffer() == &buffer)
1770                         return wa;
1771         }
1772         return nullptr;
1773 }
1774
1775
1776 void TabWorkArea::closeAll()
1777 {
1778         while (count()) {
1779                 QWidget * wac = widget(0);
1780                 LASSERT(wac, return);
1781                 removeTab(0);
1782                 delete wac;
1783         }
1784 }
1785
1786
1787 int TabWorkArea::indexOfWorkArea(GuiWorkArea * w) const
1788 {
1789         for (int index = 0; index < count(); ++index)
1790                 if (workArea(index) == w)
1791                         return index;
1792         return -1;
1793 }
1794
1795
1796 bool TabWorkArea::setCurrentWorkArea(GuiWorkArea * work_area)
1797 {
1798         LASSERT(work_area, return false);
1799         int index = indexOfWorkArea(work_area);
1800         if (index == -1)
1801                 return false;
1802
1803         if (index == currentIndex())
1804                 // Make sure the work area is up to date.
1805                 on_currentTabChanged(index);
1806         else
1807                 // Switch to the work area.
1808                 setCurrentIndex(index);
1809         work_area->setFocus();
1810
1811         return true;
1812 }
1813
1814
1815 GuiWorkArea * TabWorkArea::addWorkArea(Buffer & buffer, GuiView & view)
1816 {
1817         GuiWorkArea * wa = new GuiWorkArea(buffer, view);
1818         GuiWorkAreaContainer * wac = new GuiWorkAreaContainer(wa);
1819         wa->setUpdatesEnabled(false);
1820         // Hide tabbar if there's no tab (avoid a resize and a flashing tabbar
1821         // when hiding it again below).
1822         if (!(currentWorkArea() && currentWorkArea()->isFullScreen()))
1823                 showBar(count() > 0);
1824         addTab(wac, wa->windowTitle());
1825         QObject::connect(wa, SIGNAL(titleChanged(GuiWorkArea *)),
1826                 this, SLOT(updateTabTexts()));
1827         if (currentWorkArea() && currentWorkArea()->isFullScreen())
1828                 setFullScreen(true);
1829         else
1830                 // Hide tabbar if there's only one tab.
1831                 showBar(count() > 1);
1832
1833         updateTabTexts();
1834
1835         return wa;
1836 }
1837
1838
1839 bool TabWorkArea::removeWorkArea(GuiWorkArea * work_area)
1840 {
1841         LASSERT(work_area, return false);
1842         int index = indexOfWorkArea(work_area);
1843         if (index == -1)
1844                 return false;
1845
1846         work_area->setUpdatesEnabled(false);
1847         QWidget * wac = widget(index);
1848         removeTab(index);
1849         delete wac;
1850
1851         if (count()) {
1852                 // make sure the next work area is enabled.
1853                 currentWidget()->setUpdatesEnabled(true);
1854                 if (currentWorkArea() && currentWorkArea()->isFullScreen())
1855                         setFullScreen(true);
1856                 else
1857                         // Show tabbar only if there's more than one tab.
1858                         showBar(count() > 1);
1859         } else
1860                 lastWorkAreaRemoved();
1861
1862         updateTabTexts();
1863
1864         return true;
1865 }
1866
1867
1868 void TabWorkArea::on_currentTabChanged(int i)
1869 {
1870         // returns e.g. on application destruction
1871         if (i == -1)
1872                 return;
1873         GuiWorkArea * wa = workArea(i);
1874         LASSERT(wa, return);
1875         wa->setUpdatesEnabled(true);
1876         wa->scheduleRedraw(true);
1877         wa->setFocus();
1878         ///
1879         currentWorkAreaChanged(wa);
1880
1881         LYXERR(Debug::GUI, "currentTabChanged " << i
1882                 << " File: " << wa->bufferView().buffer().absFileName());
1883 }
1884
1885
1886 void TabWorkArea::closeCurrentBuffer()
1887 {
1888         GuiWorkArea * wa;
1889         if (clicked_tab_ == -1)
1890                 wa = currentWorkArea();
1891         else {
1892                 wa = workArea(clicked_tab_);
1893                 LASSERT(wa, return);
1894         }
1895         wa->view().closeWorkArea(wa);
1896 }
1897
1898
1899 void TabWorkArea::hideCurrentTab()
1900 {
1901         GuiWorkArea * wa;
1902         if (clicked_tab_ == -1)
1903                 wa = currentWorkArea();
1904         else {
1905                 wa = workArea(clicked_tab_);
1906                 LASSERT(wa, return);
1907         }
1908         wa->view().hideWorkArea(wa);
1909 }
1910
1911
1912 void TabWorkArea::closeTab(int index)
1913 {
1914         on_currentTabChanged(index);
1915         GuiWorkArea * wa;
1916         if (index == -1)
1917                 wa = currentWorkArea();
1918         else {
1919                 wa = workArea(index);
1920                 LASSERT(wa, return);
1921         }
1922         wa->view().closeWorkArea(wa);
1923 }
1924
1925
1926 ///
1927 class DisplayPath {
1928 public:
1929         /// make vector happy
1930         DisplayPath() : tab_(-1), dottedPrefix_(false) {}
1931         ///
1932         DisplayPath(int tab, FileName const & filename)
1933                 : tab_(tab)
1934         {
1935                 // Recode URL encoded chars via fromPercentEncoding()
1936                 string const fn = (filename.extension() == "lyx")
1937                         ? filename.onlyFileNameWithoutExt() : filename.onlyFileName();
1938                 filename_ = QString::fromUtf8(QByteArray::fromPercentEncoding(fn.c_str()));
1939                 postfix_ = toqstr(filename.absoluteFilePath()).
1940                         split("/", QString::SkipEmptyParts);
1941                 postfix_.pop_back();
1942                 abs_ = toqstr(filename.absoluteFilePath());
1943                 dottedPrefix_ = false;
1944         }
1945
1946         /// Absolute path for debugging.
1947         QString abs() const
1948         {
1949                 return abs_;
1950         }
1951         /// Add the first segment from the postfix or three dots to the prefix.
1952         /// Merge multiple dot tripples. In fact dots are added lazily, i.e. only
1953         /// when really needed.
1954         void shiftPathSegment(bool dotted)
1955         {
1956                 if (postfix_.count() <= 0)
1957                         return;
1958
1959                 if (!dotted) {
1960                         if (dottedPrefix_ && !prefix_.isEmpty())
1961                                 prefix_ += ellipsisSlash_;
1962                         prefix_ += postfix_.front() + "/";
1963                 }
1964                 dottedPrefix_ = dotted && !prefix_.isEmpty();
1965                 postfix_.pop_front();
1966         }
1967         ///
1968         QString displayString() const
1969         {
1970                 if (prefix_.isEmpty())
1971                         return filename_;
1972
1973                 bool dots = dottedPrefix_ || !postfix_.isEmpty();
1974                 return prefix_ + (dots ? ellipsisSlash_ : "") + filename_;
1975         }
1976         ///
1977         QString forecastPathString() const
1978         {
1979                 if (postfix_.count() == 0)
1980                         return displayString();
1981
1982                 return prefix_
1983                         + (dottedPrefix_ ? ellipsisSlash_ : "")
1984                         + postfix_.front() + "/";
1985         }
1986         ///
1987         bool final() const { return postfix_.empty(); }
1988         ///
1989         int tab() const { return tab_; }
1990
1991 private:
1992         /// ".../"
1993         static QString const ellipsisSlash_;
1994         ///
1995         QString prefix_;
1996         ///
1997         QStringList postfix_;
1998         ///
1999         QString filename_;
2000         ///
2001         QString abs_;
2002         ///
2003         int tab_;
2004         ///
2005         bool dottedPrefix_;
2006 };
2007
2008
2009 QString const DisplayPath::ellipsisSlash_ = QString(QChar(0x2026)) + "/";
2010
2011
2012 ///
2013 bool operator<(DisplayPath const & a, DisplayPath const & b)
2014 {
2015         return a.displayString() < b.displayString();
2016 }
2017
2018 ///
2019 bool operator==(DisplayPath const & a, DisplayPath const & b)
2020 {
2021         return a.displayString() == b.displayString();
2022 }
2023
2024
2025 void TabWorkArea::updateTabTexts()
2026 {
2027         int const n = count();
2028         if (n == 0)
2029                 return;
2030         std::list<DisplayPath> paths;
2031         typedef std::list<DisplayPath>::iterator It;
2032
2033         // collect full names first: path into postfix, empty prefix and
2034         // filename without extension
2035         for (int i = 0; i < n; ++i) {
2036                 GuiWorkArea * i_wa = workArea(i);
2037                 FileName const fn = i_wa->bufferView().buffer().fileName();
2038                 paths.push_back(DisplayPath(i, fn));
2039         }
2040
2041         // go through path segments and see if it helps to make the path more unique
2042         bool somethingChanged = true;
2043         bool allFinal = false;
2044         while (somethingChanged && !allFinal) {
2045                 // adding path segments changes order
2046                 paths.sort();
2047
2048                 LYXERR(Debug::GUI, "updateTabTexts() iteration start");
2049                 somethingChanged = false;
2050                 allFinal = true;
2051
2052                 // find segments which are not unique (i.e. non-atomic)
2053                 It it = paths.begin();
2054                 It segStart = it;
2055                 QString segString = it->displayString();
2056                 for (; it != paths.end(); ++it) {
2057                         // look to the next item
2058                         It next = it;
2059                         ++next;
2060
2061                         // final?
2062                         allFinal = allFinal && it->final();
2063
2064                         LYXERR(Debug::GUI, "it = " << it->abs()
2065                                << " => " << it->displayString());
2066
2067                         // still the same segment?
2068                         QString nextString;
2069                         if ((next != paths.end()
2070                              && (nextString = next->displayString()) == segString))
2071                                 continue;
2072                         LYXERR(Debug::GUI, "segment ended");
2073
2074                         // only a trivial one with one element?
2075                         if (it == segStart) {
2076                                 // start new segment
2077                                 segStart = next;
2078                                 segString = nextString;
2079                                 continue;
2080                         }
2081
2082                         // We found a non-atomic segment
2083                         // We know that segStart <= it < next <= paths.end().
2084                         // The assertion below tells coverity about it.
2085                         LATTEST(segStart != paths.end());
2086                         QString dspString = segStart->forecastPathString();
2087                         LYXERR(Debug::GUI, "first forecast found for "
2088                                << segStart->abs() << " => " << dspString);
2089                         It sit = segStart;
2090                         ++sit;
2091                         // Shift path segments and hope for the best
2092                         // that it makes the path more unique.
2093                         somethingChanged = true;
2094                         bool moreUnique = false;
2095                         for (; sit != next; ++sit) {
2096                                 if (sit->forecastPathString() != dspString) {
2097                                         LYXERR(Debug::GUI, "different forecast found for "
2098                                                 << sit->abs() << " => " << sit->forecastPathString());
2099                                         moreUnique = true;
2100                                         break;
2101                                 }
2102                                 LYXERR(Debug::GUI, "same forecast found for "
2103                                         << sit->abs() << " => " << dspString);
2104                         }
2105
2106                         // if the path segment helped, add it. Otherwise add dots
2107                         bool dots = !moreUnique;
2108                         LYXERR(Debug::GUI, "using dots = " << dots);
2109                         for (sit = segStart; sit != next; ++sit) {
2110                                 sit->shiftPathSegment(dots);
2111                                 LYXERR(Debug::GUI, "shifting "
2112                                         << sit->abs() << " => " << sit->displayString());
2113                         }
2114
2115                         // start new segment
2116                         segStart = next;
2117                         segString = nextString;
2118                 }
2119         }
2120
2121         // set new tab titles
2122         for (It it = paths.begin(); it != paths.end(); ++it) {
2123                 int const tab_index = it->tab();
2124                 Buffer const & buf = workArea(tab_index)->bufferView().buffer();
2125                 QString tab_text = it->displayString().replace("&", "&&");
2126                 if (!buf.fileName().empty() && !buf.isClean())
2127                         tab_text += "*";
2128                 QString tab_tooltip = it->abs();
2129                 if (buf.hasReadonlyFlag()) {
2130                         setTabIcon(tab_index, QIcon(getPixmap("images/", "emblem-readonly", "svgz,png")));
2131                         tab_tooltip = qt_("%1 (read only)").arg(tab_tooltip);
2132                 } else
2133                         setTabIcon(tab_index, QIcon());
2134                 if (buf.notifiesExternalModification()) {
2135                         QString const warn = qt_("%1 (modified externally)");
2136                         tab_tooltip = warn.arg(tab_tooltip);
2137                         tab_text += QChar(0x26a0);
2138                 }
2139                 setTabText(tab_index, tab_text);
2140                 setTabToolTip(tab_index, tab_tooltip);
2141         }
2142 }
2143
2144
2145 void TabWorkArea::showContextMenu(const QPoint & pos)
2146 {
2147         // which tab?
2148         clicked_tab_ = tabBar()->tabAt(pos);
2149         if (clicked_tab_ == -1)
2150                 return;
2151
2152         GuiWorkArea * wa = workArea(clicked_tab_);
2153         LASSERT(wa, return);
2154
2155         // show tab popup
2156         QMenu popup;
2157         popup.addAction(QIcon(getPixmap("images/", "hidetab", "svgz,png")),
2158                 qt_("Hide tab"), this, SLOT(hideCurrentTab()));
2159
2160         // we want to show the 'close' option only if this is not a child buffer.
2161         Buffer const & buf = wa->bufferView().buffer();
2162         if (!buf.parent())
2163                 popup.addAction(QIcon(getPixmap("images/", "closetab", "svgz,png")),
2164                         qt_("Close tab"), this, SLOT(closeCurrentBuffer()));
2165         popup.exec(tabBar()->mapToGlobal(pos));
2166
2167         clicked_tab_ = -1;
2168 }
2169
2170
2171 void TabWorkArea::moveTab(int fromIndex, int toIndex)
2172 {
2173         QWidget * w = widget(fromIndex);
2174         QIcon icon = tabIcon(fromIndex);
2175         QString text = tabText(fromIndex);
2176
2177         setCurrentIndex(fromIndex);
2178         removeTab(fromIndex);
2179         insertTab(toIndex, w, icon, text);
2180         setCurrentIndex(toIndex);
2181 }
2182
2183
2184 GuiWorkAreaContainer::GuiWorkAreaContainer(GuiWorkArea * wa, QWidget * parent)
2185         : QWidget(parent), wa_(wa)
2186 {
2187         LASSERT(wa, return);
2188         Ui::WorkAreaUi::setupUi(this);
2189         layout()->addWidget(wa);
2190         connect(wa, SIGNAL(titleChanged(GuiWorkArea *)),
2191                 this, SLOT(updateDisplay()));
2192         connect(reloadPB, SIGNAL(clicked()), this, SLOT(reload()));
2193         connect(ignorePB, SIGNAL(clicked()), this, SLOT(ignore()));
2194         setMessageColour({notificationFrame}, {reloadPB, ignorePB});
2195         updateDisplay();
2196 }
2197
2198
2199 void GuiWorkAreaContainer::updateDisplay()
2200 {
2201         Buffer const & buf = wa_->bufferView().buffer();
2202         notificationFrame->setHidden(!buf.notifiesExternalModification());
2203         QString const label = qt_("<b>The file %1 changed on disk.</b>")
2204                 .arg(toqstr(buf.fileName().displayName()));
2205         externalModificationLabel->setText(label);
2206 }
2207
2208
2209 void GuiWorkAreaContainer::dispatch(FuncRequest f) const
2210 {
2211         lyx::dispatch(FuncRequest(LFUN_BUFFER_SWITCH,
2212                                   wa_->bufferView().buffer().absFileName()));
2213         lyx::dispatch(f);
2214 }
2215
2216
2217 void GuiWorkAreaContainer::reload() const
2218 {
2219         dispatch(FuncRequest(LFUN_BUFFER_RELOAD));
2220 }
2221
2222
2223 void GuiWorkAreaContainer::ignore() const
2224 {
2225         dispatch(FuncRequest(LFUN_BUFFER_EXTERNAL_MODIFICATION_CLEAR));
2226 }
2227
2228
2229 void GuiWorkAreaContainer::mouseDoubleClickEvent(QMouseEvent * event)
2230 {
2231         // prevent TabWorkArea from opening a new buffer on double click
2232         event->accept();
2233 }
2234
2235
2236 } // namespace frontend
2237 } // namespace lyx
2238
2239 #include "moc_GuiWorkArea.cpp"