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