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), schedule_redraw_(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::redraw(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         if (schedule_redraw_) {
 634                 // This happens when a graphic conversion is finished. As we don't know
 635                 // the size of the new graphics, it's better the update everything.
 636                 // We can't use redraw() here because this would trigger a infinite
 637                 // recursive loop with showCaret().
 638                 buffer_view_->resize(p->viewport()->width(), p->viewport()->height());
 639                 p->viewport()->update();
 640                 updateScrollbar();
 641                 schedule_redraw_ = false;
 642                 return;
 643         }
 644
 645         p->viewport()->update(caret_->rect());
 646 }
 647
 648
 649 void GuiWorkArea::Private::hideCaret()
 650 {
 651         if (!caret_visible_)
 652                 return;
 653
 654         caret_visible_ = false;
 655         //if (!qApp->focusWidget())
 656                 p->viewport()->update(caret_->rect());
 657 }
 658
 659
 660 void GuiWorkArea::Private::updateScrollbar()
 661 {
 662         // Prevent setRange() and setSliderPosition from causing recursive calls via
 663         // the signal valueChanged. (#10311)
 664         QObject::disconnect(p->verticalScrollBar(), SIGNAL(valueChanged(int)),
 665                             p, SLOT(scrollTo(int)));
 666         ScrollbarParameters const & scroll_ = buffer_view_->scrollbarParameters();
 667         p->verticalScrollBar()->setRange(scroll_.min, scroll_.max);
 668         p->verticalScrollBar()->setPageStep(scroll_.page_step);
 669         p->verticalScrollBar()->setSingleStep(scroll_.single_step);
 670         p->verticalScrollBar()->setSliderPosition(0);
 671         // Connect to the vertical scroll bar
 672         QObject::connect(p->verticalScrollBar(), SIGNAL(valueChanged(int)),
 673                          p, SLOT(scrollTo(int)));
 674 }
 675
 676
 677 void GuiWorkArea::scrollTo(int value)
 678 {
 679         stopBlinkingCaret();
 680         d->buffer_view_->scrollDocView(value, true);
 681
 682         if (lyxrc.cursor_follows_scrollbar) {
 683                 d->buffer_view_->setCursorFromScrollbar();
 684                 // FIXME: let GuiView take care of those.
 685                 d->lyx_view_->updateLayoutList();
 686         }
 687         // Show the caret immediately after any operation.
 688         startBlinkingCaret();
 689         // FIXME QT5
 690 #ifdef Q_WS_X11
 691         QApplication::syncX();
 692 #endif
 693 }
 694
 695
 696 bool GuiWorkArea::event(QEvent * e)
 697 {
 698         switch (e->type()) {
 699         case QEvent::ToolTip: {
 700                 QHelpEvent * helpEvent = static_cast<QHelpEvent *>(e);
 701                 if (lyxrc.use_tooltip) {
 702                         QPoint pos = helpEvent->pos();
 703                         if (pos.x() < viewport()->width()) {
 704                                 QString s = toqstr(d->buffer_view_->toolTip(pos.x(), pos.y()));
 705                                 QToolTip::showText(helpEvent->globalPos(), formatToolTip(s,35));
 706                         }
 707                         else
 708                                 QToolTip::hideText();
 709                 }
 710                 // Don't forget to accept the event!
 711                 e->accept();
 712                 return true;
 713         }
 714
 715         case QEvent::ShortcutOverride:
 716                 // keyPressEvent is ShortcutOverride-aware and only accepts the event in
 717                 // this case
 718                 keyPressEvent(static_cast<QKeyEvent *>(e));
 719                 return e->isAccepted();
 720
 721         case QEvent::KeyPress: {
 722                 // We catch this event in order to catch the Tab or Shift+Tab key press
 723                 // which are otherwise reserved to focus switching between controls
 724                 // within a dialog.
 725                 QKeyEvent * ke = static_cast<QKeyEvent*>(e);
 726                 if ((ke->key() == Qt::Key_Tab && ke->modifiers() == Qt::NoModifier)
 727                         || (ke->key() == Qt::Key_Backtab && (
 728                                 ke->modifiers() == Qt::ShiftModifier
 729                                 || ke->modifiers() == Qt::NoModifier))) {
 730                         keyPressEvent(ke);
 731                         return true;
 732                 }
 733                 return QAbstractScrollArea::event(e);
 734         }
 735
 736         default:
 737                 return QAbstractScrollArea::event(e);
 738         }
 739         return false;
 740 }
 741
 742
 743 void GuiWorkArea::contextMenuEvent(QContextMenuEvent * e)
 744 {
 745         string name;
 746         if (e->reason() == QContextMenuEvent::Mouse)
 747                 // the menu name is set on mouse press
 748                 name = d->context_menu_name_;
 749         else {
 750                 QPoint pos = e->pos();
 751                 Cursor const & cur = d->buffer_view_->cursor();
 752                 if (e->reason() == QContextMenuEvent::Keyboard && cur.inTexted()) {
 753                         // Do not access the context menu of math right in front of before
 754                         // the cursor. This does not work when the cursor is in text.
 755                         Inset * inset = cur.paragraph().getInset(cur.pos());
 756                         if (inset && inset->asInsetMath())
 757                                 --pos.rx();
 758                         else if (cur.pos() > 0) {
 759                                 Inset * inset = cur.paragraph().getInset(cur.pos() - 1);
 760                                 if (inset)
 761                                         ++pos.rx();
 762                         }
 763                 }
 764                 name = d->buffer_view_->contextMenu(pos.x(), pos.y());
 765         }
 766
 767         if (name.empty()) {
 768                 e->accept();
 769                 return;
 770         }
 771         // always show mnemonics when the keyboard is used to show the context menu
 772         // FIXME: This should be fixed in Qt itself
 773         bool const keyboard = (e->reason() == QContextMenuEvent::Keyboard);
 774         QMenu * menu = guiApp->menus().menu(toqstr(name), *d->lyx_view_, keyboard);
 775         if (!menu) {
 776                 e->accept();
 777                 return;
 778         }
 779         // Position the menu to the right.
 780         // FIXME: menu position should be different for RTL text.
 781         menu->exec(e->globalPos());
 782         e->accept();
 783 }
 784
 785
 786 void GuiWorkArea::focusInEvent(QFocusEvent * e)
 787 {
 788         LYXERR(Debug::DEBUG, "GuiWorkArea::focusInEvent(): " << this << endl);
 789         if (d->lyx_view_->currentWorkArea() != this) {
 790                 d->lyx_view_->setCurrentWorkArea(this);
 791                 d->lyx_view_->currentWorkArea()->bufferView().buffer().updateBuffer();
 792         }
 793
 794         startBlinkingCaret();
 795         QAbstractScrollArea::focusInEvent(e);
 796 }
 797
 798
 799 void GuiWorkArea::focusOutEvent(QFocusEvent * e)
 800 {
 801         LYXERR(Debug::DEBUG, "GuiWorkArea::focusOutEvent(): " << this << endl);
 802         stopBlinkingCaret();
 803         QAbstractScrollArea::focusOutEvent(e);
 804 }
 805
 806
 807 void GuiWorkArea::mousePressEvent(QMouseEvent * e)
 808 {
 809         if (d->dc_event_.active && d->dc_event_ == *e) {
 810                 d->dc_event_.active = false;
 811                 FuncRequest cmd(LFUN_MOUSE_TRIPLE, e->x(), e->y(),
 812                         q_button_state(e->button()), q_key_state(e->modifiers()));
 813                 d->dispatch(cmd);
 814                 e->accept();
 815                 return;
 816         }
 817
 818 #if (QT_VERSION < 0x050000) && !defined(__HAIKU__)
 819         inputContext()->reset();
 820 #endif
 821
 822         FuncRequest const cmd(LFUN_MOUSE_PRESS, e->x(), e->y(),
 823                         q_button_state(e->button()), q_key_state(e->modifiers()));
 824         d->dispatch(cmd);
 825
 826         // Save the context menu on mouse press, because also the mouse
 827         // cursor is set on mouse press. Afterwards, we can either release
 828         // the mousebutton somewhere else, or the cursor might have moved
 829         // due to the DEPM. We need to do this after the mouse has been
 830         // set in dispatch(), because the selection state might change.
 831         if (e->button() == Qt::RightButton)
 832                 d->context_menu_name_ = d->buffer_view_->contextMenu(e->x(), e->y());
 833
 834         e->accept();
 835 }
 836
 837
 838 void GuiWorkArea::mouseReleaseEvent(QMouseEvent * e)
 839 {
 840         if (d->synthetic_mouse_event_.timeout.running())
 841                 d->synthetic_mouse_event_.timeout.stop();
 842
 843         FuncRequest const cmd(LFUN_MOUSE_RELEASE, e->x(), e->y(),
 844                         q_button_state(e->button()), q_key_state(e->modifiers()));
 845         d->dispatch(cmd);
 846         e->accept();
 847 }
 848
 849
 850 void GuiWorkArea::mouseMoveEvent(QMouseEvent * e)
 851 {
 852         // we kill the triple click if we move
 853         doubleClickTimeout();
 854         FuncRequest cmd(LFUN_MOUSE_MOTION, e->x(), e->y(),
 855                         q_motion_state(e->buttons()), q_key_state(e->modifiers()));
 856
 857         e->accept();
 858
 859         // If we're above or below the work area...
 860         if ((e->y() <= 20 || e->y() >= viewport()->height() - 20)
 861                         && e->buttons() == mouse_button::button1) {
 862                 // Make sure only a synthetic event can cause a page scroll,
 863                 // so they come at a steady rate:
 864                 if (e->y() <= 20)
 865                         // _Force_ a scroll up:
 866                         cmd.set_y(e->y() - 21);
 867                 else
 868                         cmd.set_y(e->y() + 21);
 869                 // Store the event, to be handled when the timeout expires.
 870                 d->synthetic_mouse_event_.cmd = cmd;
 871
 872                 if (d->synthetic_mouse_event_.timeout.running()) {
 873                         // Discard the event. Note that it _may_ be handled
 874                         // when the timeout expires if
 875                         // synthetic_mouse_event_.cmd has not been overwritten.
 876                         // Ie, when the timeout expires, we handle the
 877                         // most recent event but discard all others that
 878                         // occurred after the one used to start the timeout
 879                         // in the first place.
 880                         return;
 881                 }
 882
 883                 d->synthetic_mouse_event_.restart_timeout = true;
 884                 d->synthetic_mouse_event_.timeout.start();
 885                 // Fall through to handle this event...
 886
 887         } else if (d->synthetic_mouse_event_.timeout.running()) {
 888                 // Store the event, to be possibly handled when the timeout
 889                 // expires.
 890                 // Once the timeout has expired, normal control is returned
 891                 // to mouseMoveEvent (restart_timeout = false).
 892                 // This results in a much smoother 'feel' when moving the
 893                 // mouse back into the work area.
 894                 d->synthetic_mouse_event_.cmd = cmd;
 895                 d->synthetic_mouse_event_.restart_timeout = false;
 896                 return;
 897         }
 898         d->dispatch(cmd);
 899 }
 900
 901
 902 void GuiWorkArea::wheelEvent(QWheelEvent * ev)
 903 {
 904         // Wheel rotation by one notch results in a delta() of 120 (see
 905         // documentation of QWheelEvent)
 906         double const delta = ev->delta() / 120.0;
 907         bool zoom = false;
 908         switch (lyxrc.scroll_wheel_zoom) {
 909         case LyXRC::SCROLL_WHEEL_ZOOM_CTRL:
 910                 zoom = ev->modifiers() & Qt::ControlModifier;
 911                 zoom &= !(ev->modifiers() & (Qt::ShiftModifier | Qt::AltModifier));
 912                 break;
 913         case LyXRC::SCROLL_WHEEL_ZOOM_SHIFT:
 914                 zoom = ev->modifiers() & Qt::ShiftModifier;
 915                 zoom &= !(ev->modifiers() & (Qt::ControlModifier | Qt::AltModifier));
 916                 break;
 917         case LyXRC::SCROLL_WHEEL_ZOOM_ALT:
 918                 zoom = ev->modifiers() & Qt::AltModifier;
 919                 zoom &= !(ev->modifiers() & (Qt::ShiftModifier | Qt::ControlModifier));
 920                 break;
 921         case LyXRC::SCROLL_WHEEL_ZOOM_OFF:
 922                 break;
 923         }
 924         if (zoom) {
 925                 docstring arg = convert<docstring>(int(5 * delta));
 926                 lyx::dispatch(FuncRequest(LFUN_BUFFER_ZOOM_IN, arg));
 927                 return;
 928         }
 929
 930         // Take into account the desktop wide settings.
 931         int const lines = qApp->wheelScrollLines();
 932         int const page_step = verticalScrollBar()->pageStep();
 933         // Test if the wheel mouse is set to one screen at a time.
 934         // This is according to
 935         // https://doc.qt.io/qt-5/qapplication.html#wheelScrollLines-prop
 936         int scroll_value =
 937                 min(lines * verticalScrollBar()->singleStep(), page_step);
 938
 939         // Take into account the rotation and the user preferences.
 940         scroll_value = int(scroll_value * delta * lyxrc.mouse_wheel_speed);
 941         LYXERR(Debug::SCROLLING, "wheelScrollLines = " << lines
 942                         << " delta = " << delta << " scroll_value = " << scroll_value
 943                         << " page_step = " << page_step);
 944         // Now scroll.
 945         verticalScrollBar()->setValue(verticalScrollBar()->value() - scroll_value);
 946
 947         ev->accept();
 948 }
 949
 950
 951 void GuiWorkArea::generateSyntheticMouseEvent()
 952 {
 953         int const e_y = d->synthetic_mouse_event_.cmd.y();
 954         int const wh = d->buffer_view_->workHeight();
 955         bool const up = e_y < 0;
 956         bool const down = e_y > wh;
 957
 958         // Set things off to generate the _next_ 'pseudo' event.
 959         int step = 50;
 960         if (d->synthetic_mouse_event_.restart_timeout) {
 961                 // This is some magic formulae to determine the speed
 962                 // of scrolling related to the position of the mouse.
 963                 int time = 200;
 964                 if (up || down) {
 965                         int dist = up ? -e_y : e_y - wh;
 966                         time = max(min(200, 250000 / (dist * dist)), 1) ;
 967
 968                         if (time < 40) {
 969                                 step = 80000 / (time * time);
 970                                 time = 40;
 971                         }
 972                 }
 973                 d->synthetic_mouse_event_.timeout.setTimeout(time);
 974                 d->synthetic_mouse_event_.timeout.start();
 975         }
 976
 977         // Can we scroll further ?
 978         int const value = verticalScrollBar()->value();
 979         if (value == verticalScrollBar()->maximum()
 980                   || value == verticalScrollBar()->minimum()) {
 981                 d->synthetic_mouse_event_.timeout.stop();
 982                 return;
 983         }
 984
 985         // Scroll
 986         if (step <= 2 * wh) {
 987                 d->buffer_view_->scroll(up ? -step : step);
 988                 d->buffer_view_->updateMetrics();
 989         } else {
 990                 d->buffer_view_->scrollDocView(value + (up ? -step : step), false);
 991         }
 992
 993         // In which paragraph do we have to set the cursor ?
 994         Cursor & cur = d->buffer_view_->cursor();
 995         // FIXME: we don't know how to handle math.
 996         Text * text = cur.text();
 997         if (!text)
 998                 return;
 999         TextMetrics const & tm = d->buffer_view_->textMetrics(text);
1000
1001         // Quit gracefully if there are no metrics, since otherwise next
1002         // line would crash (bug #10324).
1003         // This situation seems related to a (not yet understood) timing problem.
1004         if (tm.empty())
1005                 return;
1006
1007         pair<pit_type, const ParagraphMetrics *> pp = up ? tm.first() : tm.last();
1008         ParagraphMetrics const & pm = *pp.second;
1009         pit_type const pit = pp.first;
1010
1011         if (pm.rows().empty())
1012                 return;
1013
1014         // Find the row at which we set the cursor.
1015         RowList::const_iterator rit = pm.rows().begin();
1016         RowList::const_iterator rlast = pm.rows().end();
1017         int yy = pm.position() - pm.ascent();
1018         for (--rlast; rit != rlast; ++rit) {
1019                 int h = rit->height();
1020                 if ((up && yy + h > 0)
1021                           || (!up && yy + h > wh - defaultRowHeight()))
1022                         break;
1023                 yy += h;
1024         }
1025
1026         // Find the position of the cursor
1027         bool bound;
1028         int x = d->synthetic_mouse_event_.cmd.x();
1029         pos_type const pos = tm.getPosNearX(*rit, x, bound);
1030
1031         // Set the cursor
1032         cur.pit() = pit;
1033         cur.pos() = pos;
1034         cur.boundary(bound);
1035
1036         d->buffer_view_->buffer().changed(false);
1037         return;
1038 }
1039
1040
1041 void GuiWorkArea::keyPressEvent(QKeyEvent * ev)
1042 {
1043         // this is also called for ShortcutOverride events. In this case, one must
1044         // not act but simply accept the event explicitly.
1045         bool const act = (ev->type() != QEvent::ShortcutOverride);
1046
1047         // Do not process here some keys if dialog_mode_ is set
1048         if (d->dialog_mode_
1049                 && (ev->modifiers() == Qt::NoModifier
1050                     || ev->modifiers() == Qt::ShiftModifier)
1051                 && (ev->key() == Qt::Key_Escape
1052                     || ev->key() == Qt::Key_Enter
1053                     || ev->key() == Qt::Key_Return)
1054             ) {
1055                 ev->ignore();
1056                 return;
1057         }
1058
1059         // intercept some keys if completion popup is visible
1060         if (d->completer_->popupVisible()) {
1061                 switch (ev->key()) {
1062                 case Qt::Key_Enter:
1063                 case Qt::Key_Return:
1064                         if (act)
1065                                 d->completer_->activate();
1066                         ev->accept();
1067                         return;
1068                 }
1069         }
1070
1071         // do nothing if there are other events
1072         // (the auto repeated events come too fast)
1073         // it looks like this is only needed on X11
1074 #if defined(Q_WS_X11) || defined(QPA_XCB)
1075         // FIXME: this is a weird way to implement event compression. Also, this is
1076         // broken with IBus.
1077         if (act && qApp->hasPendingEvents() && ev->isAutoRepeat()) {
1078                 switch (ev->key()) {
1079                 case Qt::Key_PageDown:
1080                 case Qt::Key_PageUp:
1081                 case Qt::Key_Left:
1082                 case Qt::Key_Right:
1083                 case Qt::Key_Up:
1084                 case Qt::Key_Down:
1085                         LYXERR(Debug::KEY, "system is busy: scroll key event ignored");
1086                         ev->ignore();
1087                         return;
1088                 }
1089         }
1090 #endif
1091
1092         KeyModifier const m = q_key_state(ev->modifiers());
1093
1094         std::string str;
1095         if (m & ShiftModifier)
1096                 str += "Shift-";
1097         if (m & ControlModifier)
1098                 str += "Control-";
1099         if (m & AltModifier)
1100                 str += "Alt-";
1101         if (m & MetaModifier)
1102                 str += "Meta-";
1103
1104         if (act)
1105                 LYXERR(Debug::KEY, " count: " << ev->count() << " text: " << ev->text()
1106                        << " isAutoRepeat: " << ev->isAutoRepeat() << " key: " << ev->key()
1107                        << " keyState: " << str);
1108
1109         KeySymbol sym;
1110         setKeySymbol(&sym, ev);
1111         if (sym.isOK()) {
1112                 if (act) {
1113                         processKeySym(sym, m);
1114                         ev->accept();
1115                 } else
1116                         ev->setAccepted(queryKeySym(sym, m));
1117         } else {
1118                 ev->ignore();
1119         }
1120 }
1121
1122
1123 void GuiWorkArea::doubleClickTimeout()
1124 {
1125         d->dc_event_.active = false;
1126 }
1127
1128
1129 void GuiWorkArea::mouseDoubleClickEvent(QMouseEvent * ev)
1130 {
1131         d->dc_event_ = DoubleClick(ev);
1132         QTimer::singleShot(QApplication::doubleClickInterval(), this,
1133                         SLOT(doubleClickTimeout()));
1134         FuncRequest cmd(LFUN_MOUSE_DOUBLE, ev->x(), ev->y(),
1135                         q_button_state(ev->button()), q_key_state(ev->modifiers()));
1136         d->dispatch(cmd);
1137         ev->accept();
1138 }
1139
1140
1141 void GuiWorkArea::resizeEvent(QResizeEvent * ev)
1142 {
1143         QAbstractScrollArea::resizeEvent(ev);
1144         d->need_resize_ = true;
1145         ev->accept();
1146 }
1147
1148
1149 void GuiWorkArea::Private::paintPreeditText(GuiPainter & pain)
1150 {
1151         if (preedit_string_.empty())
1152                 return;
1153
1154         // FIXME: shall we use real_current_font here? (see #10478)
1155         FontInfo const font = buffer_view_->cursor().getFont().fontInfo();
1156         FontMetrics const & fm = theFontMetrics(font);
1157         int const height = fm.maxHeight();
1158         int cur_x = caret_->rect().left();
1159         int cur_y = caret_->rect().bottom();
1160
1161         // get attributes of input method cursor.
1162         // cursor_pos : cursor position in preedit string.
1163         size_t cursor_pos = 0;
1164         bool cursor_is_visible = false;
1165         for (auto const & attr : preedit_attr_) {
1166                 if (attr.type == QInputMethodEvent::Cursor) {
1167                         cursor_pos = attr.start;
1168                         cursor_is_visible = attr.length != 0;
1169                         break;
1170                 }
1171         }
1172
1173         size_t const preedit_length = preedit_string_.length();
1174
1175         // get position of selection in input method.
1176         // FIXME: isn't there a way to do this simplier?
1177         // rStart : cursor position in selected string in IM.
1178         size_t rStart = 0;
1179         // rLength : selected string length in IM.
1180         size_t rLength = 0;
1181         if (cursor_pos < preedit_length) {
1182                 for (auto const & attr : preedit_attr_) {
1183                         if (attr.type == QInputMethodEvent::TextFormat) {
1184                                 if (attr.start <= int(cursor_pos)
1185                                         && int(cursor_pos) < attr.start + attr.length) {
1186                                                 rStart = attr.start;
1187                                                 rLength = attr.length;
1188                                                 if (!cursor_is_visible)
1189                                                         cursor_pos += rLength;
1190                                                 break;
1191                                 }
1192                         }
1193                 }
1194         }
1195         else {
1196                 rStart = cursor_pos;
1197                 rLength = 0;
1198         }
1199
1200         int const right_margin = buffer_view_->rightMargin();
1201         Painter::preedit_style ps;
1202         // Most often there would be only one line:
1203         preedit_lines_ = 1;
1204         for (size_t pos = 0; pos != preedit_length; ++pos) {
1205                 char_type const typed_char = preedit_string_[pos];
1206                 // reset preedit string style
1207                 ps = Painter::preedit_default;
1208
1209                 // if we reached the right extremity of the screen, go to next line.
1210                 if (cur_x + fm.width(typed_char) > p->viewport()->width() - right_margin) {
1211                         cur_x = right_margin;
1212                         cur_y += height + 1;
1213                         ++preedit_lines_;
1214                 }
1215                 // preedit strings are displayed with dashed underline
1216                 // and partial strings are displayed white on black indicating
1217                 // that we are in selecting mode in the input method.
1218                 // FIXME: rLength == preedit_length is not a changing condition
1219                 // FIXME: should be put out of the loop.
1220                 if (pos >= rStart
1221                         && pos < rStart + rLength
1222                         && !(cursor_pos < rLength && rLength == preedit_length))
1223                         ps = Painter::preedit_selecting;
1224
1225                 if (pos == cursor_pos
1226                         && (cursor_pos < rLength && rLength == preedit_length))
1227                         ps = Painter::preedit_cursor;
1228
1229                 // draw one character and update cur_x.
1230                 cur_x += pain.preeditText(cur_x, cur_y, typed_char, font, ps);
1231         }
1232 }
1233
1234
1235 void GuiWorkArea::paintEvent(QPaintEvent * ev)
1236 {
1237         // LYXERR(Debug::PAINTING, "paintEvent begin: x: " << rc.x()
1238         //      << " y: " << rc.y() << " w: " << rc.width() << " h: " << rc.height());
1239
1240         if (d->needResize()) {
1241                 d->resizeBufferView();
1242                 if (d->caret_visible_) {
1243                         d->hideCaret();
1244                         d->showCaret();
1245                 }
1246         }
1247
1248         GuiPainter pain(viewport(), pixelRatio());
1249         d->buffer_view_->draw(pain, d->caret_visible_);
1250
1251         // The preedit text, if needed
1252         d->paintPreeditText(pain);
1253
1254         // and the caret
1255         if (d->caret_visible_)
1256                 d->caret_->draw(pain);
1257         ev->accept();
1258 }
1259
1260
1261 void GuiWorkArea::inputMethodEvent(QInputMethodEvent * e)
1262 {
1263         LYXERR(Debug::KEY, "preeditString: " << e->preeditString()
1264                    << " commitString: " << e->commitString());
1265
1266         // insert the processed text in the document (handles undo)
1267         if (!e->commitString().isEmpty()) {
1268                 d->buffer_view_->cursor().beginUndoGroup();
1269                 d->buffer_view_->cursor().insert(qstring_to_ucs4(e->commitString()));
1270                 d->buffer_view_->updateMetrics();
1271                 d->buffer_view_->cursor().endUndoGroup();
1272                 viewport()->update();
1273         }
1274
1275         // Hide the caret during the test transformation.
1276         if (e->preeditString().isEmpty())
1277                 startBlinkingCaret();
1278         else
1279                 stopBlinkingCaret();
1280
1281         if (d->preedit_string_.empty() && e->preeditString().isEmpty()) {
1282                 // Nothing to do
1283                 e->accept();
1284                 return;
1285         }
1286
1287         // The preedit text and its attributes will be used in paintPreeditText
1288         d->preedit_string_ = qstring_to_ucs4(e->preeditString());
1289         d->preedit_attr_ = e->attributes();
1290
1291
1292         // redraw area of preedit string.
1293         int height = d->caret_->rect().height();
1294         int cur_y = d->caret_->rect().bottom();
1295         viewport()->update(0, cur_y - height, viewport()->width(),
1296                 (height + 1) * d->preedit_lines_);
1297
1298         if (d->preedit_string_.empty()) {
1299                 d->preedit_lines_ = 1;
1300                 e->accept();
1301                 return;
1302         }
1303
1304         // Don't forget to accept the event!
1305         e->accept();
1306 }
1307
1308
1309 QVariant GuiWorkArea::inputMethodQuery(Qt::InputMethodQuery query) const
1310 {
1311         QRect cur_r(0, 0, 0, 0);
1312         switch (query) {
1313                 // this is the CJK-specific composition window position and
1314                 // the context menu position when the menu key is pressed.
1315                 case Qt::ImMicroFocus:
1316                         cur_r = d->caret_->rect();
1317                         if (d->preedit_lines_ != 1)
1318                                 cur_r.moveLeft(10);
1319                         cur_r.moveBottom(cur_r.bottom()
1320                                 + cur_r.height() * (d->preedit_lines_ - 1));
1321                         // return lower right of caret in LyX.
1322                         return cur_r;
1323                 default:
1324                         return QWidget::inputMethodQuery(query);
1325         }
1326 }
1327
1328
1329 void GuiWorkArea::updateWindowTitle()
1330 {
1331         Buffer const & buf = bufferView().buffer();
1332         if (buf.fileName() != d->file_name_
1333             || buf.params().shell_escape != d->shell_escape_
1334             || buf.hasReadonlyFlag() != d->read_only_
1335             || buf.lyxvc().vcstatus() != d->vc_status_
1336             || buf.isClean() != d->clean_
1337             || buf.notifiesExternalModification() != d->externally_modified_) {
1338                 d->file_name_ = buf.fileName();
1339                 d->shell_escape_ = buf.params().shell_escape;
1340                 d->read_only_ = buf.hasReadonlyFlag();
1341                 d->vc_status_ = buf.lyxvc().vcstatus();
1342                 d->clean_ = buf.isClean();
1343                 d->externally_modified_ = buf.notifiesExternalModification();
1344                 Q_EMIT titleChanged(this);
1345         }
1346 }
1347
1348
1349 bool GuiWorkArea::isFullScreen() const
1350 {
1351         return d->lyx_view_ && d->lyx_view_->isFullScreen();
1352 }
1353
1354
1355 void GuiWorkArea::scheduleRedraw()
1356 {
1357         d->schedule_redraw_ = true;
1358 }
1359
1360
1361 bool GuiWorkArea::inDialogMode() const
1362 {
1363         return d->dialog_mode_;
1364 }
1365
1366
1367 void GuiWorkArea::setDialogMode(bool mode)
1368 {
1369         d->dialog_mode_ = mode;
1370 }
1371
1372
1373 GuiCompleter & GuiWorkArea::completer()
1374 {
1375         return *d->completer_;
1376 }
1377
1378 GuiView const & GuiWorkArea::view() const
1379 {
1380         return *d->lyx_view_;
1381 }
1382
1383
1384 GuiView & GuiWorkArea::view()
1385 {
1386         return *d->lyx_view_;
1387 }
1388
1389 ////////////////////////////////////////////////////////////////////
1390 //
1391 // EmbeddedWorkArea
1392 //
1393 ////////////////////////////////////////////////////////////////////
1394
1395
1396 EmbeddedWorkArea::EmbeddedWorkArea(QWidget * w): GuiWorkArea(w)
1397 {
1398         support::TempFile tempfile("embedded.internal");
1399         tempfile.setAutoRemove(false);
1400         buffer_ = theBufferList().newInternalBuffer(tempfile.name().absFileName());
1401         buffer_->setUnnamed(true);
1402         buffer_->setFullyLoaded(true);
1403         setBuffer(*buffer_);
1404         setDialogMode(true);
1405 }
1406
1407
1408 EmbeddedWorkArea::~EmbeddedWorkArea()
1409 {
1410         // No need to destroy buffer and bufferview here, because it is done
1411         // in theBufferList() destruction loop at application exit
1412 }
1413
1414
1415 void EmbeddedWorkArea::closeEvent(QCloseEvent * ev)
1416 {
1417         disable();
1418         GuiWorkArea::closeEvent(ev);
1419 }
1420
1421
1422 void EmbeddedWorkArea::hideEvent(QHideEvent * ev)
1423 {
1424         disable();
1425         GuiWorkArea::hideEvent(ev);
1426 }
1427
1428
1429 QSize EmbeddedWorkArea::sizeHint () const
1430 {
1431         // FIXME(?):
1432         // GuiWorkArea sets the size to the screen's viewport
1433         // by returning a value this gets overridden
1434         // EmbeddedWorkArea is now sized to fit in the layout
1435         // of the parent, and has a minimum size set in GuiWorkArea
1436         // which is what we return here
1437         return QSize(100, 70);
1438 }
1439
1440
1441 void EmbeddedWorkArea::disable()
1442 {
1443         stopBlinkingCaret();
1444         if (view().currentWorkArea() != this)
1445                 return;
1446         // No problem if currentMainWorkArea() is 0 (setCurrentWorkArea()
1447         // tolerates it and shows the background logo), what happens if
1448         // an EmbeddedWorkArea is closed after closing all document WAs
1449         view().setCurrentWorkArea(view().currentMainWorkArea());
1450 }
1451
1452 ////////////////////////////////////////////////////////////////////
1453 //
1454 // TabWorkArea
1455 //
1456 ////////////////////////////////////////////////////////////////////
1457
1458 #ifdef Q_OS_MAC
1459 class NoTabFrameMacStyle : public QProxyStyle {
1460 public:
1461         ///
1462         QRect subElementRect(SubElement element, const QStyleOption * option,
1463                              const QWidget * widget = 0) const
1464         {
1465                 QRect rect = QProxyStyle::subElementRect(element, option, widget);
1466                 bool noBar = static_cast<QTabWidget const *>(widget)->count() <= 1;
1467
1468                 // The Qt Mac style puts the contents into a 3 pixel wide box
1469                 // which looks very ugly and not like other Mac applications.
1470                 // Hence we remove this here, and moreover the 16 pixel round
1471                 // frame above if the tab bar is hidden.
1472                 if (element == QStyle::SE_TabWidgetTabContents) {
1473                         rect.adjust(- rect.left(), 0, rect.left(), 0);
1474                         if (noBar)
1475                                 rect.setTop(0);
1476                 }
1477
1478                 return rect;
1479         }
1480 };
1481
1482 NoTabFrameMacStyle noTabFrameMacStyle;
1483 #endif
1484
1485
1486 TabWorkArea::TabWorkArea(QWidget * parent)
1487         : QTabWidget(parent), clicked_tab_(-1), midpressed_tab_(-1)
1488 {
1489 #ifdef Q_OS_MAC
1490         setStyle(&noTabFrameMacStyle);
1491 #endif
1492
1493         QPalette pal = palette();
1494         pal.setColor(QPalette::Active, QPalette::Button,
1495                 pal.color(QPalette::Active, QPalette::Window));
1496         pal.setColor(QPalette::Disabled, QPalette::Button,
1497                 pal.color(QPalette::Disabled, QPalette::Window));
1498         pal.setColor(QPalette::Inactive, QPalette::Button,
1499                 pal.color(QPalette::Inactive, QPalette::Window));
1500
1501         QObject::connect(this, SIGNAL(currentChanged(int)),
1502                 this, SLOT(on_currentTabChanged(int)));
1503
1504         closeBufferButton = new QToolButton(this);
1505         closeBufferButton->setPalette(pal);
1506         // FIXME: rename the icon to closebuffer.png
1507         closeBufferButton->setIcon(QIcon(getPixmap("images/", "closetab", "svgz,png")));
1508         closeBufferButton->setText("Close File");
1509         closeBufferButton->setAutoRaise(true);
1510         closeBufferButton->setCursor(Qt::ArrowCursor);
1511         closeBufferButton->setToolTip(qt_("Close File"));
1512         closeBufferButton->setEnabled(true);
1513         QObject::connect(closeBufferButton, SIGNAL(clicked()),
1514                 this, SLOT(closeCurrentBuffer()));
1515         setCornerWidget(closeBufferButton, Qt::TopRightCorner);
1516
1517         // setup drag'n'drop
1518         QTabBar* tb = new DragTabBar;
1519         connect(tb, SIGNAL(tabMoveRequested(int, int)),
1520                 this, SLOT(moveTab(int, int)));
1521         tb->setElideMode(Qt::ElideNone);
1522         setTabBar(tb);
1523
1524         // make us responsible for the context menu of the tabbar
1525         tb->setContextMenuPolicy(Qt::CustomContextMenu);
1526         connect(tb, SIGNAL(customContextMenuRequested(const QPoint &)),
1527                 this, SLOT(showContextMenu(const QPoint &)));
1528         connect(tb, SIGNAL(tabCloseRequested(int)),
1529                 this, SLOT(closeTab(int)));
1530
1531         setUsesScrollButtons(true);
1532 }
1533
1534
1535 void TabWorkArea::mousePressEvent(QMouseEvent *me)
1536 {
1537         if (me->button() == Qt::MidButton)
1538                 midpressed_tab_ = tabBar()->tabAt(me->pos());
1539         else
1540                 QTabWidget::mousePressEvent(me);
1541 }
1542
1543
1544 void TabWorkArea::mouseReleaseEvent(QMouseEvent *me)
1545 {
1546         if (me->button() == Qt::MidButton) {
1547                 int const midreleased_tab = tabBar()->tabAt(me->pos());
1548                 if (midpressed_tab_ == midreleased_tab && posIsTab(me->pos()))
1549                         closeTab(midreleased_tab);
1550         } else
1551                 QTabWidget::mouseReleaseEvent(me);
1552 }
1553
1554
1555 void TabWorkArea::paintEvent(QPaintEvent * event)
1556 {
1557         if (tabBar()->isVisible()) {
1558                 QTabWidget::paintEvent(event);
1559         } else {
1560                 // Prevent the selected tab to influence the
1561                 // painting of the frame of the tab widget.
1562                 // This is needed for gtk style in Qt.
1563                 QStylePainter p(this);
1564 #if QT_VERSION < 0x050000
1565                 QStyleOptionTabWidgetFrameV2 opt;
1566 #else
1567                 QStyleOptionTabWidgetFrame opt;
1568 #endif
1569                 initStyleOption(&opt);
1570                 opt.rect = style()->subElementRect(QStyle::SE_TabWidgetTabPane,
1571                         &opt, this);
1572                 opt.selectedTabRect = QRect();
1573                 p.drawPrimitive(QStyle::PE_FrameTabWidget, opt);
1574         }
1575 }
1576
1577
1578 bool TabWorkArea::posIsTab(QPoint position)
1579 {
1580         // tabAt returns -1 if tab does not covers position
1581         return tabBar()->tabAt(position) > -1;
1582 }
1583
1584
1585 void TabWorkArea::mouseDoubleClickEvent(QMouseEvent * event)
1586 {
1587         if (event->button() != Qt::LeftButton)
1588                 return;
1589
1590         // this code chunk is unnecessary because it seems the event only makes
1591         // it this far if it is not on a tab. I'm not sure why this is (maybe
1592         // it is handled and ended in DragTabBar?), and thus I'm not sure if
1593         // this is true in all cases and if it will be true in the future so I
1594         // leave this code for now. (skostysh, 2016-07-21)
1595         //
1596         // return early if double click on existing tabs
1597         if (posIsTab(event->pos()))
1598                 return;
1599
1600         dispatch(FuncRequest(LFUN_BUFFER_NEW));
1601 }
1602
1603
1604 void TabWorkArea::setFullScreen(bool full_screen)
1605 {
1606         for (int i = 0; i != count(); ++i) {
1607                 if (GuiWorkArea * wa = workArea(i))
1608                         wa->setFullScreen(full_screen);
1609         }
1610
1611         if (lyxrc.full_screen_tabbar)
1612                 showBar(!full_screen && count() > 1);
1613         else
1614                 showBar(count() > 1);
1615 }
1616
1617
1618 void TabWorkArea::showBar(bool show)
1619 {
1620         tabBar()->setEnabled(show);
1621         tabBar()->setVisible(show);
1622         closeBufferButton->setVisible(show && lyxrc.single_close_tab_button);
1623         setTabsClosable(!lyxrc.single_close_tab_button);
1624 }
1625
1626
1627 GuiWorkAreaContainer * TabWorkArea::widget(int index) const
1628 {
1629         QWidget * w = QTabWidget::widget(index);
1630         if (!w)
1631                 return nullptr;
1632         GuiWorkAreaContainer * wac = dynamic_cast<GuiWorkAreaContainer *>(w);
1633         LATTEST(wac);
1634         return wac;
1635 }
1636
1637
1638 GuiWorkAreaContainer * TabWorkArea::currentWidget() const
1639 {
1640         return widget(currentIndex());
1641 }
1642
1643
1644 GuiWorkArea * TabWorkArea::workArea(int index) const
1645 {
1646         GuiWorkAreaContainer * w = widget(index);
1647         if (!w)
1648                 return nullptr;
1649         return w->workArea();
1650 }
1651
1652
1653 GuiWorkArea * TabWorkArea::currentWorkArea() const
1654 {
1655         return workArea(currentIndex());
1656 }
1657
1658
1659 GuiWorkArea * TabWorkArea::workArea(Buffer & buffer) const
1660 {
1661         // FIXME: this method doesn't work if we have more than one work area
1662         // showing the same buffer.
1663         for (int i = 0; i != count(); ++i) {
1664                 GuiWorkArea * wa = workArea(i);
1665                 LASSERT(wa, return 0);
1666                 if (&wa->bufferView().buffer() == &buffer)
1667                         return wa;
1668         }
1669         return 0;
1670 }
1671
1672
1673 void TabWorkArea::closeAll()
1674 {
1675         while (count()) {
1676                 QWidget * wac = widget(0);
1677                 LASSERT(wac, return);
1678                 removeTab(0);
1679                 delete wac;
1680         }
1681 }
1682
1683
1684 int TabWorkArea::indexOfWorkArea(GuiWorkArea * w) const
1685 {
1686         for (int index = 0; index < count(); ++index)
1687                 if (workArea(index) == w)
1688                         return index;
1689         return -1;
1690 }
1691
1692
1693 bool TabWorkArea::setCurrentWorkArea(GuiWorkArea * work_area)
1694 {
1695         LASSERT(work_area, return false);
1696         int index = indexOfWorkArea(work_area);
1697         if (index == -1)
1698                 return false;
1699
1700         if (index == currentIndex())
1701                 // Make sure the work area is up to date.
1702                 on_currentTabChanged(index);
1703         else
1704                 // Switch to the work area.
1705                 setCurrentIndex(index);
1706         work_area->setFocus();
1707
1708         return true;
1709 }
1710
1711
1712 GuiWorkArea * TabWorkArea::addWorkArea(Buffer & buffer, GuiView & view)
1713 {
1714         GuiWorkArea * wa = new GuiWorkArea(buffer, view);
1715         GuiWorkAreaContainer * wac = new GuiWorkAreaContainer(wa);
1716         wa->setUpdatesEnabled(false);
1717         // Hide tabbar if there's no tab (avoid a resize and a flashing tabbar
1718         // when hiding it again below).
1719         if (!(currentWorkArea() && currentWorkArea()->isFullScreen()))
1720                 showBar(count() > 0);
1721         addTab(wac, wa->windowTitle());
1722         QObject::connect(wa, SIGNAL(titleChanged(GuiWorkArea *)),
1723                 this, SLOT(updateTabTexts()));
1724         if (currentWorkArea() && currentWorkArea()->isFullScreen())
1725                 setFullScreen(true);
1726         else
1727                 // Hide tabbar if there's only one tab.
1728                 showBar(count() > 1);
1729
1730         updateTabTexts();
1731
1732         return wa;
1733 }
1734
1735
1736 bool TabWorkArea::removeWorkArea(GuiWorkArea * work_area)
1737 {
1738         LASSERT(work_area, return false);
1739         int index = indexOfWorkArea(work_area);
1740         if (index == -1)
1741                 return false;
1742
1743         work_area->setUpdatesEnabled(false);
1744         QWidget * wac = widget(index);
1745         removeTab(index);
1746         delete wac;
1747
1748         if (count()) {
1749                 // make sure the next work area is enabled.
1750                 currentWidget()->setUpdatesEnabled(true);
1751                 if (currentWorkArea() && currentWorkArea()->isFullScreen())
1752                         setFullScreen(true);
1753                 else
1754                         // Show tabbar only if there's more than one tab.
1755                         showBar(count() > 1);
1756         } else
1757                 lastWorkAreaRemoved();
1758
1759         updateTabTexts();
1760
1761         return true;
1762 }
1763
1764
1765 void TabWorkArea::on_currentTabChanged(int i)
1766 {
1767         // returns e.g. on application destruction
1768         if (i == -1)
1769                 return;
1770         GuiWorkArea * wa = workArea(i);
1771         LASSERT(wa, return);
1772         wa->setUpdatesEnabled(true);
1773         wa->redraw(true);
1774         wa->setFocus();
1775         ///
1776         currentWorkAreaChanged(wa);
1777
1778         LYXERR(Debug::GUI, "currentTabChanged " << i
1779                 << " File: " << wa->bufferView().buffer().absFileName());
1780 }
1781
1782
1783 void TabWorkArea::closeCurrentBuffer()
1784 {
1785         GuiWorkArea * wa;
1786         if (clicked_tab_ == -1)
1787                 wa = currentWorkArea();
1788         else {
1789                 wa = workArea(clicked_tab_);
1790                 LASSERT(wa, return);
1791         }
1792         wa->view().closeWorkArea(wa);
1793 }
1794
1795
1796 void TabWorkArea::hideCurrentTab()
1797 {
1798         GuiWorkArea * wa;
1799         if (clicked_tab_ == -1)
1800                 wa = currentWorkArea();
1801         else {
1802                 wa = workArea(clicked_tab_);
1803                 LASSERT(wa, return);
1804         }
1805         wa->view().hideWorkArea(wa);
1806 }
1807
1808
1809 void TabWorkArea::closeTab(int index)
1810 {
1811         on_currentTabChanged(index);
1812         GuiWorkArea * wa;
1813         if (index == -1)
1814                 wa = currentWorkArea();
1815         else {
1816                 wa = workArea(index);
1817                 LASSERT(wa, return);
1818         }
1819         wa->view().closeWorkArea(wa);
1820 }
1821
1822
1823 ///
1824 class DisplayPath {
1825 public:
1826         /// make vector happy
1827         DisplayPath() : tab_(-1), dottedPrefix_(false) {}
1828         ///
1829         DisplayPath(int tab, FileName const & filename)
1830                 : tab_(tab)
1831         {
1832                 filename_ = (filename.extension() == "lyx") ?
1833                         toqstr(filename.onlyFileNameWithoutExt())
1834                         : toqstr(filename.onlyFileName());
1835                 postfix_ = toqstr(filename.absoluteFilePath()).
1836                         split("/", QString::SkipEmptyParts);
1837                 postfix_.pop_back();
1838                 abs_ = toqstr(filename.absoluteFilePath());
1839                 dottedPrefix_ = false;
1840         }
1841
1842         /// Absolute path for debugging.
1843         QString abs() const
1844         {
1845                 return abs_;
1846         }
1847         /// Add the first segment from the postfix or three dots to the prefix.
1848         /// Merge multiple dot tripples. In fact dots are added lazily, i.e. only
1849         /// when really needed.
1850         void shiftPathSegment(bool dotted)
1851         {
1852                 if (postfix_.count() <= 0)
1853                         return;
1854
1855                 if (!dotted) {
1856                         if (dottedPrefix_ && !prefix_.isEmpty())
1857                                 prefix_ += ellipsisSlash_;
1858                         prefix_ += postfix_.front() + "/";
1859                 }
1860                 dottedPrefix_ = dotted && !prefix_.isEmpty();
1861                 postfix_.pop_front();
1862         }
1863         ///
1864         QString displayString() const
1865         {
1866                 if (prefix_.isEmpty())
1867                         return filename_;
1868
1869                 bool dots = dottedPrefix_ || !postfix_.isEmpty();
1870                 return prefix_ + (dots ? ellipsisSlash_ : "") + filename_;
1871         }
1872         ///
1873         QString forecastPathString() const
1874         {
1875                 if (postfix_.count() == 0)
1876                         return displayString();
1877
1878                 return prefix_
1879                         + (dottedPrefix_ ? ellipsisSlash_ : "")
1880                         + postfix_.front() + "/";
1881         }
1882         ///
1883         bool final() const { return postfix_.empty(); }
1884         ///
1885         int tab() const { return tab_; }
1886
1887 private:
1888         /// ".../"
1889         static QString const ellipsisSlash_;
1890         ///
1891         QString prefix_;
1892         ///
1893         QStringList postfix_;
1894         ///
1895         QString filename_;
1896         ///
1897         QString abs_;
1898         ///
1899         int tab_;
1900         ///
1901         bool dottedPrefix_;
1902 };
1903
1904
1905 QString const DisplayPath::ellipsisSlash_ = QString(QChar(0x2026)) + "/";
1906
1907
1908 ///
1909 bool operator<(DisplayPath const & a, DisplayPath const & b)
1910 {
1911         return a.displayString() < b.displayString();
1912 }
1913
1914 ///
1915 bool operator==(DisplayPath const & a, DisplayPath const & b)
1916 {
1917         return a.displayString() == b.displayString();
1918 }
1919
1920
1921 void TabWorkArea::updateTabTexts()
1922 {
1923         size_t n = count();
1924         if (n == 0)
1925                 return;
1926         std::list<DisplayPath> paths;
1927         typedef std::list<DisplayPath>::iterator It;
1928
1929         // collect full names first: path into postfix, empty prefix and
1930         // filename without extension
1931         for (size_t i = 0; i < n; ++i) {
1932                 GuiWorkArea * i_wa = workArea(i);
1933                 FileName const fn = i_wa->bufferView().buffer().fileName();
1934                 paths.push_back(DisplayPath(i, fn));
1935         }
1936
1937         // go through path segments and see if it helps to make the path more unique
1938         bool somethingChanged = true;
1939         bool allFinal = false;
1940         while (somethingChanged && !allFinal) {
1941                 // adding path segments changes order
1942                 paths.sort();
1943
1944                 LYXERR(Debug::GUI, "updateTabTexts() iteration start");
1945                 somethingChanged = false;
1946                 allFinal = true;
1947
1948                 // find segments which are not unique (i.e. non-atomic)
1949                 It it = paths.begin();
1950                 It segStart = it;
1951                 QString segString = it->displayString();
1952                 for (; it != paths.end(); ++it) {
1953                         // look to the next item
1954                         It next = it;
1955                         ++next;
1956
1957                         // final?
1958                         allFinal = allFinal && it->final();
1959
1960                         LYXERR(Debug::GUI, "it = " << it->abs()
1961                                << " => " << it->displayString());
1962
1963                         // still the same segment?
1964                         QString nextString;
1965                         if ((next != paths.end()
1966                              && (nextString = next->displayString()) == segString))
1967                                 continue;
1968                         LYXERR(Debug::GUI, "segment ended");
1969
1970                         // only a trivial one with one element?
1971                         if (it == segStart) {
1972                                 // start new segment
1973                                 segStart = next;
1974                                 segString = nextString;
1975                                 continue;
1976                         }
1977
1978                         // We found a non-atomic segment
1979                         // We know that segStart <= it < next <= paths.end().
1980                         // The assertion below tells coverity about it.
1981                         LATTEST(segStart != paths.end());
1982                         QString dspString = segStart->forecastPathString();
1983                         LYXERR(Debug::GUI, "first forecast found for "
1984                                << segStart->abs() << " => " << dspString);
1985                         It sit = segStart;
1986                         ++sit;
1987                         // Shift path segments and hope for the best
1988                         // that it makes the path more unique.
1989                         somethingChanged = true;
1990                         bool moreUnique = false;
1991                         for (; sit != next; ++sit) {
1992                                 if (sit->forecastPathString() != dspString) {
1993                                         LYXERR(Debug::GUI, "different forecast found for "
1994                                                 << sit->abs() << " => " << sit->forecastPathString());
1995                                         moreUnique = true;
1996                                         break;
1997                                 }
1998                                 LYXERR(Debug::GUI, "same forecast found for "
1999                                         << sit->abs() << " => " << dspString);
2000                         }
2001
2002                         // if the path segment helped, add it. Otherwise add dots
2003                         bool dots = !moreUnique;
2004                         LYXERR(Debug::GUI, "using dots = " << dots);
2005                         for (sit = segStart; sit != next; ++sit) {
2006                                 sit->shiftPathSegment(dots);
2007                                 LYXERR(Debug::GUI, "shifting "
2008                                         << sit->abs() << " => " << sit->displayString());
2009                         }
2010
2011                         // start new segment
2012                         segStart = next;
2013                         segString = nextString;
2014                 }
2015         }
2016
2017         // set new tab titles
2018         for (It it = paths.begin(); it != paths.end(); ++it) {
2019                 int const tab_index = it->tab();
2020                 Buffer const & buf = workArea(tab_index)->bufferView().buffer();
2021                 QString tab_text = it->displayString().replace("&", "&&");
2022                 if (!buf.fileName().empty() && !buf.isClean())
2023                         tab_text += "*";
2024                 QString tab_tooltip = it->abs();
2025                 if (buf.hasReadonlyFlag()) {
2026                         setTabIcon(tab_index, QIcon(getPixmap("images/", "emblem-readonly", "svgz,png")));
2027                         tab_tooltip = qt_("%1 (read only)").arg(tab_tooltip);
2028                 } else
2029                         setTabIcon(tab_index, QIcon());
2030                 if (buf.notifiesExternalModification()) {
2031                         QString const warn = qt_("%1 (modified externally)");
2032                         tab_tooltip = warn.arg(tab_tooltip);
2033                         tab_text += QChar(0x26a0);
2034                 }
2035                 setTabText(tab_index, tab_text);
2036                 setTabToolTip(tab_index, tab_tooltip);
2037         }
2038 }
2039
2040
2041 void TabWorkArea::showContextMenu(const QPoint & pos)
2042 {
2043         // which tab?
2044         clicked_tab_ = static_cast<DragTabBar *>(tabBar())->tabAt(pos);
2045         if (clicked_tab_ == -1)
2046                 return;
2047
2048         // show tab popup
2049         QMenu popup;
2050         popup.addAction(QIcon(getPixmap("images/", "hidetab", "svgz,png")),
2051                 qt_("Hide tab"), this, SLOT(hideCurrentTab()));
2052         popup.addAction(QIcon(getPixmap("images/", "closetab", "svgz,png")),
2053                 qt_("Close tab"), this, SLOT(closeCurrentBuffer()));
2054         popup.exec(tabBar()->mapToGlobal(pos));
2055
2056         clicked_tab_ = -1;
2057 }
2058
2059
2060 void TabWorkArea::moveTab(int fromIndex, int toIndex)
2061 {
2062         QWidget * w = widget(fromIndex);
2063         QIcon icon = tabIcon(fromIndex);
2064         QString text = tabText(fromIndex);
2065
2066         setCurrentIndex(fromIndex);
2067         removeTab(fromIndex);
2068         insertTab(toIndex, w, icon, text);
2069         setCurrentIndex(toIndex);
2070 }
2071
2072
2073 DragTabBar::DragTabBar(QWidget* parent)
2074         : QTabBar(parent)
2075 {
2076         setAcceptDrops(true);
2077         setTabsClosable(!lyxrc.single_close_tab_button);
2078 }
2079
2080
2081 void DragTabBar::mousePressEvent(QMouseEvent * event)
2082 {
2083         if (event->button() == Qt::LeftButton)
2084                 dragStartPos_ = event->pos();
2085         QTabBar::mousePressEvent(event);
2086 }
2087
2088
2089 void DragTabBar::mouseMoveEvent(QMouseEvent * event)
2090 {
2091         // If the left button isn't pressed anymore then return
2092         if (!(event->buttons() & Qt::LeftButton))
2093                 return;
2094
2095         // If the distance is too small then return
2096         if ((event->pos() - dragStartPos_).manhattanLength()
2097             < QApplication::startDragDistance())
2098                 return;
2099
2100         // did we hit something after all?
2101         int tab = tabAt(dragStartPos_);
2102         if (tab == -1)
2103                 return;
2104
2105         // simulate button release to remove highlight from button
2106         int i = currentIndex();
2107         QMouseEvent me(QEvent::MouseButtonRelease, dragStartPos_,
2108                 event->button(), event->buttons(), 0);
2109         QTabBar::mouseReleaseEvent(&me);
2110         setCurrentIndex(i);
2111
2112         // initiate Drag
2113         QDrag * drag = new QDrag(this);
2114         QMimeData * mimeData = new QMimeData;
2115         // a crude way to distinguish tab-reodering drops from other ones
2116         mimeData->setData("action", "tab-reordering") ;
2117         drag->setMimeData(mimeData);
2118
2119         // get tab pixmap as cursor
2120         QRect r = tabRect(tab);
2121         QPixmap pixmap(r.size());
2122         render(&pixmap, - r.topLeft());
2123         drag->setPixmap(pixmap);
2124         drag->exec();
2125 }
2126
2127
2128 void DragTabBar::dragEnterEvent(QDragEnterEvent * event)
2129 {
2130         // Only accept if it's an tab-reordering request
2131         QMimeData const * m = event->mimeData();
2132         QStringList formats = m->formats();
2133         if (formats.contains("action")
2134             && m->data("action") == "tab-reordering")
2135                 event->acceptProposedAction();
2136 }
2137
2138
2139 void DragTabBar::dropEvent(QDropEvent * event)
2140 {
2141         int fromIndex = tabAt(dragStartPos_);
2142         int toIndex = tabAt(event->pos());
2143
2144         // Tell interested objects that
2145         if (fromIndex != toIndex)
2146                 tabMoveRequested(fromIndex, toIndex);
2147         event->acceptProposedAction();
2148 }
2149
2150
2151 GuiWorkAreaContainer::GuiWorkAreaContainer(GuiWorkArea * wa, QWidget * parent)
2152         : QWidget(parent), wa_(wa)
2153 {
2154         LASSERT(wa, return);
2155         Ui::WorkAreaUi::setupUi(this);
2156         layout()->addWidget(wa);
2157         connect(wa, SIGNAL(titleChanged(GuiWorkArea *)),
2158                 this, SLOT(updateDisplay()));
2159         connect(reloadPB, SIGNAL(clicked()), this, SLOT(reload()));
2160         connect(ignorePB, SIGNAL(clicked()), this, SLOT(ignore()));
2161         setMessageColour({notificationFrame}, {reloadPB, ignorePB});
2162         updateDisplay();
2163 }
2164
2165
2166 void GuiWorkAreaContainer::updateDisplay()
2167 {
2168         Buffer const & buf = wa_->bufferView().buffer();
2169         notificationFrame->setHidden(!buf.notifiesExternalModification());
2170         QString const label = qt_("<b>The file %1 changed on disk.</b>")
2171                 .arg(toqstr(buf.fileName().displayName()));
2172         externalModificationLabel->setText(label);
2173 }
2174
2175
2176 void GuiWorkAreaContainer::dispatch(FuncRequest f) const
2177 {
2178         lyx::dispatch(FuncRequest(LFUN_BUFFER_SWITCH,
2179                                   wa_->bufferView().buffer().absFileName()));
2180         lyx::dispatch(f);
2181 }
2182
2183
2184 void GuiWorkAreaContainer::reload() const
2185 {
2186         dispatch(FuncRequest(LFUN_BUFFER_RELOAD));
2187 }
2188
2189
2190 void GuiWorkAreaContainer::ignore() const
2191 {
2192         dispatch(FuncRequest(LFUN_BUFFER_EXTERNAL_MODIFICATION_CLEAR));
2193 }
2194
2195
2196 void GuiWorkAreaContainer::mouseDoubleClickEvent(QMouseEvent * event)
2197 {
2198         // prevent TabWorkArea from opening a new buffer on double click
2199         event->accept();
2200 }
2201
2202
2203 } // namespace frontend
2204 } // namespace lyx
2205
2206 #include "moc_GuiWorkArea.cpp"