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   last_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         new CompressorProxy(this); // not a leak
 274 }
 275
 276
 277 GuiWorkArea::GuiWorkArea(Buffer & buffer, GuiView & gv)
 278 : d(new Private(this))
 279 {
 280         new CompressorProxy(this); // not a leak
 281         setGuiView(gv);
 282         buffer.params().display_pixel_ratio = theGuiApp()->pixelRatio();
 283         setBuffer(buffer);
 284         init();
 285 }
 286
 287
 288 double GuiWorkArea::pixelRatio() const
 289 {
 290 #if QT_VERSION >= 0x050000
 291         return qt_scale_factor * devicePixelRatio();
 292 #else
 293         return 1.0;
 294 #endif
 295 }
 296
 297
 298 void GuiWorkArea::init()
 299 {
 300         // Setup the signals
 301         connect(&d->caret_timeout_, SIGNAL(timeout()),
 302                 this, SLOT(toggleCaret()));
 303
 304         // This connection is closed at the same time as this is destroyed.
 305         d->synthetic_mouse_event_.timeout.timeout.connect([this](){
 306                         generateSyntheticMouseEvent();
 307                 });
 308
 309         d->resetScreen();
 310         // With Qt4.5 a mouse event will happen before the first paint event
 311         // so make sure that the buffer view has an up to date metrics.
 312         d->buffer_view_->resize(viewport()->width(), viewport()->height());
 313         d->caret_ = new frontend::CaretWidget();
 314
 315         setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 316         setAcceptDrops(true);
 317         setMouseTracking(true);
 318         setMinimumSize(100, 70);
 319         setFrameStyle(QFrame::NoFrame);
 320         updateWindowTitle();
 321
 322         d->updateCursorShape();
 323
 324         // we paint our own background
 325         viewport()->setAttribute(Qt::WA_OpaquePaintEvent);
 326
 327         setFocusPolicy(Qt::StrongFocus);
 328
 329         LYXERR(Debug::GUI, "viewport width: " << viewport()->width()
 330                 << "  viewport height: " << viewport()->height());
 331
 332         // Enables input methods for asian languages.
 333         // Must be set when creating custom text editing widgets.
 334         setAttribute(Qt::WA_InputMethodEnabled, true);
 335 }
 336
 337
 338 GuiWorkArea::~GuiWorkArea()
 339 {
 340         delete d;
 341 }
 342
 343
 344 void GuiWorkArea::Private::updateCursorShape()
 345 {
 346         bool const clickable = buffer_view_ && buffer_view_->clickableInset();
 347         p->viewport()->setCursor(clickable ? Qt::PointingHandCursor
 348                                            : Qt::IBeamCursor);
 349 }
 350
 351
 352 void GuiWorkArea::setGuiView(GuiView & gv)
 353 {
 354         d->lyx_view_ = &gv;
 355 }
 356
 357
 358 void GuiWorkArea::setBuffer(Buffer & buffer)
 359 {
 360         delete d->buffer_view_;
 361         d->buffer_view_ = new BufferView(buffer);
 362         buffer.workAreaManager().add(this);
 363
 364         // HACK: Prevents an additional redraw when the scrollbar pops up
 365         // which regularily happens on documents with more than one page.
 366         // The policy  should be set to "Qt::ScrollBarAsNeeded" soon.
 367         // Since we have no geometry information yet, we assume that
 368         // a document needs a scrollbar if there is more then four
 369         // paragraph in the outermost text.
 370         if (buffer.text().paragraphs().size() > 4)
 371                 setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
 372         QTimer::singleShot(50, this, SLOT(fixVerticalScrollBar()));
 373         Q_EMIT bufferViewChanged();
 374 }
 375
 376
 377 void GuiWorkArea::fixVerticalScrollBar()
 378 {
 379         if (!isFullScreen())
 380                 setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
 381 }
 382
 383
 384 void GuiWorkArea::close()
 385 {
 386         d->lyx_view_->removeWorkArea(this);
 387 }
 388
 389
 390 void GuiWorkArea::setFullScreen(bool full_screen)
 391 {
 392         d->buffer_view_->setFullScreen(full_screen);
 393         setFrameStyle(QFrame::NoFrame);
 394         if (full_screen) {
 395                 setFrameStyle(QFrame::NoFrame);
 396                 if (lyxrc.full_screen_scrollbar)
 397                         setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 398         } else
 399                 setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
 400 }
 401
 402
 403 BufferView & GuiWorkArea::bufferView()
 404 {
 405         return *d->buffer_view_;
 406 }
 407
 408
 409 BufferView const & GuiWorkArea::bufferView() const
 410 {
 411         return *d->buffer_view_;
 412 }
 413
 414
 415 void GuiWorkArea::stopBlinkingCaret()
 416 {
 417         d->caret_timeout_.stop();
 418         d->hideCaret();
 419 }
 420
 421
 422 void GuiWorkArea::startBlinkingCaret()
 423 {
 424         // do not show the cursor if the view is busy
 425         if (view().busy())
 426                 return;
 427
 428         Point p;
 429         int h = 0;
 430         d->buffer_view_->caretPosAndHeight(p, h);
 431         // Don't start blinking if the cursor isn't on screen.
 432         if (!d->buffer_view_->cursorInView(p, h))
 433                 return;
 434
 435         d->showCaret();
 436
 437         // Avoid blinking when debugging PAINTING, since it creates too much noise
 438         if (!lyxerr.debugging(Debug::PAINTING)) {
 439                 // we are not supposed to cache this value.
 440                 int const time = QApplication::cursorFlashTime() / 2;
 441                 if (time <= 0)
 442                         return;
 443                 d->caret_timeout_.setInterval(time);
 444                 d->caret_timeout_.start();
 445         }
 446 }
 447
 448
 449 void GuiWorkArea::toggleCaret()
 450 {
 451         if (d->caret_visible_)
 452                 d->hideCaret();
 453         else
 454                 d->showCaret();
 455 }
 456
 457
 458 void GuiWorkArea::scheduleRedraw(bool update_metrics)
 459 {
 460         if (!isVisible())
 461                 // No need to redraw in this case.
 462                 return;
 463
 464         // No need to do anything if this is the current view. The BufferView
 465         // metrics are already up to date.
 466         if (update_metrics || d->lyx_view_ != guiApp->currentView()
 467                 || d->lyx_view_->currentWorkArea() != this) {
 468                 // FIXME: it would be nice to optimize for the off-screen case.
 469                 d->buffer_view_->cursor().fixIfBroken();
 470                 d->buffer_view_->updateMetrics();
 471                 d->buffer_view_->cursor().fixIfBroken();
 472         }
 473
 474         // update caret position, because otherwise it has to wait until
 475         // the blinking interval is over
 476         d->updateCaretGeometry();
 477
 478         LYXERR(Debug::WORKAREA, "WorkArea::redraw screen");
 479         viewport()->update();
 480
 481         /// FIXME: is this still true now that paintEvent does the actual painting?
 482         /// \warning: scrollbar updating *must* be done after the BufferView is drawn
 483         /// because \c BufferView::updateScrollbar() is called in \c BufferView::draw().
 484         d->updateScrollbar();
 485         d->lyx_view_->updateStatusBar();
 486
 487         if (lyxerr.debugging(Debug::WORKAREA))
 488                 d->buffer_view_->coordCache().dump();
 489
 490         updateWindowTitle();
 491
 492         d->updateCursorShape();
 493 }
 494
 495
 496 // Keep in sync with GuiWorkArea::processKeySym below
 497 bool GuiWorkArea::queryKeySym(KeySymbol const & key, KeyModifier mod) const
 498 {
 499         return guiApp->queryKeySym(key, mod);
 500 }
 501
 502
 503 // Keep in sync with GuiWorkArea::queryKeySym above
 504 void GuiWorkArea::processKeySym(KeySymbol const & key, KeyModifier mod)
 505 {
 506         if (d->lyx_view_->isFullScreen() && d->lyx_view_->menuBar()->isVisible()
 507                 && lyxrc.full_screen_menubar) {
 508                 // FIXME HACK: we should not have to do this here. See related comment
 509                 // in GuiView::event() (QEvent::ShortcutOverride)
 510                 d->lyx_view_->menuBar()->hide();
 511         }
 512
 513         // In order to avoid bad surprise in the middle of an operation,
 514         // we better stop the blinking caret...
 515         // the caret gets restarted in GuiView::restartCaret()
 516         stopBlinkingCaret();
 517         guiApp->processKeySym(key, mod);
 518 }
 519
 520
 521 void GuiWorkArea::Private::dispatch(FuncRequest const & cmd)
 522 {
 523         // Handle drag&drop
 524         if (cmd.action() == LFUN_FILE_OPEN) {
 525                 DispatchResult dr;
 526                 lyx_view_->dispatch(cmd, dr);
 527                 return;
 528         }
 529
 530         bool const notJustMovingTheMouse =
 531                 cmd.action() != LFUN_MOUSE_MOTION || cmd.button() != mouse_button::none;
 532
 533         // In order to avoid bad surprise in the middle of an operation, we better stop
 534         // the blinking caret.
 535         if (notJustMovingTheMouse)
 536                 p->stopBlinkingCaret();
 537
 538         buffer_view_->mouseEventDispatch(cmd);
 539
 540         // Skip these when selecting
 541         // FIXME: let GuiView take care of those.
 542         if (cmd.action() != LFUN_MOUSE_MOTION) {
 543                 completer_->updateVisibility(false, false);
 544                 lyx_view_->updateDialogs();
 545                 lyx_view_->updateStatusBar();
 546         }
 547
 548         // GUI tweaks except with mouse motion with no button pressed.
 549         if (notJustMovingTheMouse) {
 550                 // Slight hack: this is only called currently when we
 551                 // clicked somewhere, so we force through the display
 552                 // of the new status here.
 553                 // FIXME: let GuiView take care of those.
 554                 lyx_view_->clearMessage();
 555
 556                 // Show the caret immediately after any operation
 557                 p->startBlinkingCaret();
 558         }
 559
 560         updateCursorShape();
 561 }
 562
 563
 564 void GuiWorkArea::Private::resizeBufferView()
 565 {
 566         // WARNING: Please don't put any code that will trigger a repaint here!
 567         // We are already inside a paint event.
 568         p->stopBlinkingCaret();
 569         // Warn our container (GuiView).
 570         p->busy(true);
 571
 572         Point point;
 573         int h = 0;
 574         buffer_view_->caretPosAndHeight(point, h);
 575         bool const caret_in_view = buffer_view_->cursorInView(point, h);
 576         buffer_view_->resize(p->viewport()->width(), p->viewport()->height());
 577         if (caret_in_view)
 578                 buffer_view_->scrollToCursor();
 579         updateCaretGeometry();
 580
 581         // Update scrollbars which might have changed due different
 582         // BufferView dimension. This is especially important when the
 583         // BufferView goes from zero-size to the real-size for the first time,
 584         // as the scrollbar paramters are then set for the first time.
 585         updateScrollbar();
 586
 587         need_resize_ = false;
 588         p->busy(false);
 589         // Eventually, restart the caret after the resize event.
 590         // We might be resizing even if the focus is on another widget so we only
 591         // restart the caret if we have the focus.
 592         if (p->hasFocus())
 593                 QTimer::singleShot(50, p, SLOT(startBlinkingCaret()));
 594 }
 595
 596
 597 void GuiWorkArea::Private::updateCaretGeometry()
 598 {
 599         Point point;
 600         int h = 0;
 601         buffer_view_->caretPosAndHeight(point, h);
 602         if (!buffer_view_->cursorInView(point, h))
 603                 return;
 604
 605         // RTL or not RTL
 606         bool l_shape = false;
 607         Font const & realfont = buffer_view_->cursor().real_current_font;
 608         BufferParams const & bp = buffer_view_->buffer().params();
 609         bool const samelang = realfont.language() == bp.language;
 610         bool const isrtl = realfont.isVisibleRightToLeft();
 611
 612         if (!samelang || isrtl != bp.language->rightToLeft())
 613                 l_shape = true;
 614
 615         // The ERT language hack needs fixing up
 616         if (realfont.language() == latex_language)
 617                 l_shape = false;
 618
 619         // show caret on screen
 620         Cursor & cur = buffer_view_->cursor();
 621         bool completable = cur.inset().showCompletionCursor()
 622                 && completer_->completionAvailable()
 623                 && !completer_->popupVisible()
 624                 && !completer_->inlineVisible();
 625         caret_visible_ = true;
 626
 627         //int cur_x = buffer_view_->getPos(cur).x_;
 628         // We may have decided to slide the cursor row so that caret
 629         // is visible.
 630         point.x_ -= buffer_view_->horizScrollOffset();
 631
 632         caret_->update(point.x_, point.y_, h, l_shape, isrtl, completable);
 633 }
 634
 635
 636 void GuiWorkArea::Private::showCaret()
 637 {
 638         if (caret_visible_)
 639                 return;
 640
 641         updateCaretGeometry();
 642         p->viewport()->update(caret_->rect());
 643 }
 644
 645
 646 void GuiWorkArea::Private::hideCaret()
 647 {
 648         if (!caret_visible_)
 649                 return;
 650
 651         caret_visible_ = false;
 652         //if (!qApp->focusWidget())
 653                 p->viewport()->update(caret_->rect());
 654 }
 655
 656
 657 void GuiWorkArea::Private::updateScrollbar()
 658 {
 659         // Prevent setRange() and setSliderPosition from causing recursive calls via
 660         // the signal valueChanged. (#10311)
 661         QObject::disconnect(p->verticalScrollBar(), SIGNAL(valueChanged(int)),
 662                             p, SLOT(scrollTo(int)));
 663         ScrollbarParameters const & scroll_ = buffer_view_->scrollbarParameters();
 664         p->verticalScrollBar()->setRange(scroll_.min, scroll_.max);
 665         p->verticalScrollBar()->setPageStep(scroll_.page_step);
 666         p->verticalScrollBar()->setSingleStep(scroll_.single_step);
 667         p->verticalScrollBar()->setSliderPosition(0);
 668         // Connect to the vertical scroll bar
 669         QObject::connect(p->verticalScrollBar(), SIGNAL(valueChanged(int)),
 670                          p, SLOT(scrollTo(int)));
 671 }
 672
 673
 674 void GuiWorkArea::scrollTo(int value)
 675 {
 676         stopBlinkingCaret();
 677         d->buffer_view_->scrollDocView(value, true);
 678
 679         if (lyxrc.cursor_follows_scrollbar) {
 680                 d->buffer_view_->setCursorFromScrollbar();
 681                 // FIXME: let GuiView take care of those.
 682                 d->lyx_view_->updateLayoutList();
 683         }
 684         // Show the caret immediately after any operation.
 685         startBlinkingCaret();
 686         // FIXME QT5
 687 #ifdef Q_WS_X11
 688         QApplication::syncX();
 689 #endif
 690 }
 691
 692
 693 bool GuiWorkArea::event(QEvent * e)
 694 {
 695         switch (e->type()) {
 696         case QEvent::ToolTip: {
 697                 QHelpEvent * helpEvent = static_cast<QHelpEvent *>(e);
 698                 if (lyxrc.use_tooltip) {
 699                         QPoint pos = helpEvent->pos();
 700                         if (pos.x() < viewport()->width()) {
 701                                 QString s = toqstr(d->buffer_view_->toolTip(pos.x(), pos.y()));
 702                                 QToolTip::showText(helpEvent->globalPos(), formatToolTip(s,35));
 703                         }
 704                         else
 705                                 QToolTip::hideText();
 706                 }
 707                 // Don't forget to accept the event!
 708                 e->accept();
 709                 return true;
 710         }
 711
 712         case QEvent::ShortcutOverride:
 713                 // keyPressEvent is ShortcutOverride-aware and only accepts the event in
 714                 // this case
 715                 keyPressEvent(static_cast<QKeyEvent *>(e));
 716                 return e->isAccepted();
 717
 718         case QEvent::KeyPress: {
 719                 // We catch this event in order to catch the Tab or Shift+Tab key press
 720                 // which are otherwise reserved to focus switching between controls
 721                 // within a dialog.
 722                 QKeyEvent * ke = static_cast<QKeyEvent*>(e);
 723                 if ((ke->key() == Qt::Key_Tab && ke->modifiers() == Qt::NoModifier)
 724                         || (ke->key() == Qt::Key_Backtab && (
 725                                 ke->modifiers() == Qt::ShiftModifier
 726                                 || ke->modifiers() == Qt::NoModifier))) {
 727                         keyPressEvent(ke);
 728                         return true;
 729                 }
 730                 return QAbstractScrollArea::event(e);
 731         }
 732
 733         default:
 734                 return QAbstractScrollArea::event(e);
 735         }
 736         return false;
 737 }
 738
 739
 740 void GuiWorkArea::contextMenuEvent(QContextMenuEvent * e)
 741 {
 742         string name;
 743         if (e->reason() == QContextMenuEvent::Mouse)
 744                 // the menu name is set on mouse press
 745                 name = d->context_menu_name_;
 746         else {
 747                 QPoint pos = e->pos();
 748                 Cursor const & cur = d->buffer_view_->cursor();
 749                 if (e->reason() == QContextMenuEvent::Keyboard && cur.inTexted()) {
 750                         // Do not access the context menu of math right in front of before
 751                         // the cursor. This does not work when the cursor is in text.
 752                         Inset * inset = cur.paragraph().getInset(cur.pos());
 753                         if (inset && inset->asInsetMath())
 754                                 --pos.rx();
 755                         else if (cur.pos() > 0) {
 756                                 inset = cur.paragraph().getInset(cur.pos() - 1);
 757                                 if (inset)
 758                                         ++pos.rx();
 759                         }
 760                 }
 761                 name = d->buffer_view_->contextMenu(pos.x(), pos.y());
 762         }
 763
 764         if (name.empty()) {
 765                 e->accept();
 766                 return;
 767         }
 768         // always show mnemonics when the keyboard is used to show the context menu
 769         // FIXME: This should be fixed in Qt itself
 770         bool const keyboard = (e->reason() == QContextMenuEvent::Keyboard);
 771         QMenu * menu = guiApp->menus().menu(toqstr(name), *d->lyx_view_, keyboard);
 772         if (!menu) {
 773                 e->accept();
 774                 return;
 775         }
 776         // Position the menu to the right.
 777         // FIXME: menu position should be different for RTL text.
 778         menu->exec(e->globalPos());
 779         e->accept();
 780 }
 781
 782
 783 void GuiWorkArea::focusInEvent(QFocusEvent * e)
 784 {
 785         LYXERR(Debug::DEBUG, "GuiWorkArea::focusInEvent(): " << this << endl);
 786         if (d->lyx_view_->currentWorkArea() != this) {
 787                 d->lyx_view_->setCurrentWorkArea(this);
 788                 d->lyx_view_->currentWorkArea()->bufferView().buffer().updateBuffer();
 789         }
 790
 791         startBlinkingCaret();
 792         QAbstractScrollArea::focusInEvent(e);
 793 }
 794
 795
 796 void GuiWorkArea::focusOutEvent(QFocusEvent * e)
 797 {
 798         LYXERR(Debug::DEBUG, "GuiWorkArea::focusOutEvent(): " << this << endl);
 799         stopBlinkingCaret();
 800         QAbstractScrollArea::focusOutEvent(e);
 801 }
 802
 803
 804 void GuiWorkArea::mousePressEvent(QMouseEvent * e)
 805 {
 806         if (d->dc_event_.active && d->dc_event_ == *e) {
 807                 d->dc_event_.active = false;
 808                 FuncRequest cmd(LFUN_MOUSE_TRIPLE, e->x(), e->y(),
 809                         q_button_state(e->button()), q_key_state(e->modifiers()));
 810                 d->dispatch(cmd);
 811                 e->accept();
 812                 return;
 813         }
 814
 815 #if (QT_VERSION < 0x050000) && !defined(__HAIKU__)
 816         inputContext()->reset();
 817 #endif
 818
 819         FuncRequest const cmd(LFUN_MOUSE_PRESS, e->x(), e->y(),
 820                         q_button_state(e->button()), q_key_state(e->modifiers()));
 821         d->dispatch(cmd);
 822
 823         // Save the context menu on mouse press, because also the mouse
 824         // cursor is set on mouse press. Afterwards, we can either release
 825         // the mousebutton somewhere else, or the cursor might have moved
 826         // due to the DEPM. We need to do this after the mouse has been
 827         // set in dispatch(), because the selection state might change.
 828         if (e->button() == Qt::RightButton)
 829                 d->context_menu_name_ = d->buffer_view_->contextMenu(e->x(), e->y());
 830
 831         e->accept();
 832 }
 833
 834
 835 void GuiWorkArea::mouseReleaseEvent(QMouseEvent * e)
 836 {
 837         if (d->synthetic_mouse_event_.timeout.running())
 838                 d->synthetic_mouse_event_.timeout.stop();
 839
 840         FuncRequest const cmd(LFUN_MOUSE_RELEASE, e->x(), e->y(),
 841                         q_button_state(e->button()), q_key_state(e->modifiers()));
 842         d->dispatch(cmd);
 843         e->accept();
 844 }
 845
 846
 847 void GuiWorkArea::mouseMoveEvent(QMouseEvent * e)
 848 {
 849         // we kill the triple click if we move
 850         doubleClickTimeout();
 851         FuncRequest cmd(LFUN_MOUSE_MOTION, e->x(), e->y(),
 852                         q_motion_state(e->buttons()), q_key_state(e->modifiers()));
 853
 854         e->accept();
 855
 856         // If we're above or below the work area...
 857         if ((e->y() <= 20 || e->y() >= viewport()->height() - 20)
 858                         && e->buttons() == mouse_button::button1) {
 859                 // Make sure only a synthetic event can cause a page scroll,
 860                 // so they come at a steady rate:
 861                 if (e->y() <= 20)
 862                         // _Force_ a scroll up:
 863                         cmd.set_y(e->y() - 21);
 864                 else
 865                         cmd.set_y(e->y() + 21);
 866                 // Store the event, to be handled when the timeout expires.
 867                 d->synthetic_mouse_event_.cmd = cmd;
 868
 869                 if (d->synthetic_mouse_event_.timeout.running()) {
 870                         // Discard the event. Note that it _may_ be handled
 871                         // when the timeout expires if
 872                         // synthetic_mouse_event_.cmd has not been overwritten.
 873                         // Ie, when the timeout expires, we handle the
 874                         // most recent event but discard all others that
 875                         // occurred after the one used to start the timeout
 876                         // in the first place.
 877                         return;
 878                 }
 879
 880                 d->synthetic_mouse_event_.restart_timeout = true;
 881                 d->synthetic_mouse_event_.timeout.start();
 882                 // Fall through to handle this event...
 883
 884         } else if (d->synthetic_mouse_event_.timeout.running()) {
 885                 // Store the event, to be possibly handled when the timeout
 886                 // expires.
 887                 // Once the timeout has expired, normal control is returned
 888                 // to mouseMoveEvent (restart_timeout = false).
 889                 // This results in a much smoother 'feel' when moving the
 890                 // mouse back into the work area.
 891                 d->synthetic_mouse_event_.cmd = cmd;
 892                 d->synthetic_mouse_event_.restart_timeout = false;
 893                 return;
 894         }
 895         d->dispatch(cmd);
 896 }
 897
 898
 899 void GuiWorkArea::wheelEvent(QWheelEvent * ev)
 900 {
 901         // Wheel rotation by one notch results in a delta() of 120 (see
 902         // documentation of QWheelEvent)
 903         double const delta = ev->delta() / 120.0;
 904         bool zoom = false;
 905         switch (lyxrc.scroll_wheel_zoom) {
 906         case LyXRC::SCROLL_WHEEL_ZOOM_CTRL:
 907                 zoom = ev->modifiers() & Qt::ControlModifier;
 908                 zoom &= !(ev->modifiers() & (Qt::ShiftModifier | Qt::AltModifier));
 909                 break;
 910         case LyXRC::SCROLL_WHEEL_ZOOM_SHIFT:
 911                 zoom = ev->modifiers() & Qt::ShiftModifier;
 912                 zoom &= !(ev->modifiers() & (Qt::ControlModifier | Qt::AltModifier));
 913                 break;
 914         case LyXRC::SCROLL_WHEEL_ZOOM_ALT:
 915                 zoom = ev->modifiers() & Qt::AltModifier;
 916                 zoom &= !(ev->modifiers() & (Qt::ShiftModifier | Qt::ControlModifier));
 917                 break;
 918         case LyXRC::SCROLL_WHEEL_ZOOM_OFF:
 919                 break;
 920         }
 921         if (zoom) {
 922                 docstring arg = convert<docstring>(int(5 * delta));
 923                 lyx::dispatch(FuncRequest(LFUN_BUFFER_ZOOM_IN, arg));
 924                 return;
 925         }
 926
 927         // Take into account the desktop wide settings.
 928         int const lines = qApp->wheelScrollLines();
 929         int const page_step = verticalScrollBar()->pageStep();
 930         // Test if the wheel mouse is set to one screen at a time.
 931         // This is according to
 932         // https://doc.qt.io/qt-5/qapplication.html#wheelScrollLines-prop
 933         int scroll_value =
 934                 min(lines * verticalScrollBar()->singleStep(), page_step);
 935
 936         // Take into account the rotation and the user preferences.
 937         scroll_value = int(scroll_value * delta * lyxrc.mouse_wheel_speed);
 938         LYXERR(Debug::SCROLLING, "wheelScrollLines = " << lines
 939                         << " delta = " << delta << " scroll_value = " << scroll_value
 940                         << " page_step = " << page_step);
 941         // Now scroll.
 942         verticalScrollBar()->setValue(verticalScrollBar()->value() - scroll_value);
 943
 944         ev->accept();
 945 }
 946
 947
 948 void GuiWorkArea::generateSyntheticMouseEvent()
 949 {
 950         int const e_y = d->synthetic_mouse_event_.cmd.y();
 951         int const wh = d->buffer_view_->workHeight();
 952         bool const up = e_y < 0;
 953         bool const down = e_y > wh;
 954
 955         // Set things off to generate the _next_ 'pseudo' event.
 956         int step = 50;
 957         if (d->synthetic_mouse_event_.restart_timeout) {
 958                 // This is some magic formulae to determine the speed
 959                 // of scrolling related to the position of the mouse.
 960                 int time = 200;
 961                 if (up || down) {
 962                         int dist = up ? -e_y : e_y - wh;
 963                         time = max(min(200, 250000 / (dist * dist)), 1) ;
 964
 965                         if (time < 40) {
 966                                 step = 80000 / (time * time);
 967                                 time = 40;
 968                         }
 969                 }
 970                 d->synthetic_mouse_event_.timeout.setTimeout(time);
 971                 d->synthetic_mouse_event_.timeout.start();
 972         }
 973
 974         // Can we scroll further ?
 975         int const value = verticalScrollBar()->value();
 976         if (value == verticalScrollBar()->maximum()
 977                   || value == verticalScrollBar()->minimum()) {
 978                 d->synthetic_mouse_event_.timeout.stop();
 979                 return;
 980         }
 981
 982         // Scroll
 983         if (step <= 2 * wh) {
 984                 d->buffer_view_->scroll(up ? -step : step);
 985                 d->buffer_view_->updateMetrics();
 986         } else {
 987                 d->buffer_view_->scrollDocView(value + (up ? -step : step), false);
 988         }
 989
 990         // In which paragraph do we have to set the cursor ?
 991         Cursor & cur = d->buffer_view_->cursor();
 992         // FIXME: we don't know how to handle math.
 993         Text * text = cur.text();
 994         if (!text)
 995                 return;
 996         TextMetrics const & tm = d->buffer_view_->textMetrics(text);
 997
 998         // Quit gracefully if there are no metrics, since otherwise next
 999         // line would crash (bug #10324).
1000         // This situation seems related to a (not yet understood) timing problem.
1001         if (tm.empty())
1002                 return;
1003
1004         pair<pit_type, const ParagraphMetrics *> pp = up ? tm.first() : tm.last();
1005         ParagraphMetrics const & pm = *pp.second;
1006         pit_type const pit = pp.first;
1007
1008         if (pm.rows().empty())
1009                 return;
1010
1011         // Find the row at which we set the cursor.
1012         RowList::const_iterator rit = pm.rows().begin();
1013         RowList::const_iterator rlast = pm.rows().end();
1014         int yy = pm.position() - pm.ascent();
1015         for (--rlast; rit != rlast; ++rit) {
1016                 int h = rit->height();
1017                 if ((up && yy + h > 0)
1018                           || (!up && yy + h > wh - defaultRowHeight()))
1019                         break;
1020                 yy += h;
1021         }
1022
1023         // Find the position of the cursor
1024         bool bound;
1025         int x = d->synthetic_mouse_event_.cmd.x();
1026         pos_type const pos = tm.getPosNearX(*rit, x, bound);
1027
1028         // Set the cursor
1029         cur.pit() = pit;
1030         cur.pos() = pos;
1031         cur.boundary(bound);
1032
1033         d->buffer_view_->buffer().changed(false);
1034         return;
1035 }
1036
1037
1038 // CompressorProxy adapted from Kuba Ober https://stackoverflow.com/a/21006207
1039 CompressorProxy::CompressorProxy(GuiWorkArea * wa) : QObject(wa), flag_(false)
1040 {
1041         qRegisterMetaType<KeySymbol>("KeySymbol");
1042         qRegisterMetaType<KeyModifier>("KeyModifier");
1043         connect(wa, SIGNAL(compressKeySym(KeySymbol, KeyModifier, bool)),
1044                 this, SLOT(slot(KeySymbol, KeyModifier, bool)),
1045                 Qt::QueuedConnection);
1046         connect(this, SIGNAL(signal(KeySymbol, KeyModifier)),
1047                 wa, SLOT(processKeySym(KeySymbol, KeyModifier)));
1048 }
1049
1050
1051 bool CompressorProxy::emitCheck(bool isAutoRepeat)
1052 {
1053         flag_ = true;
1054         if (isAutoRepeat)
1055                 QCoreApplication::sendPostedEvents(this, QEvent::MetaCall); // recurse
1056         bool result = flag_;
1057         flag_ = false;
1058         return result;
1059 }
1060
1061
1062 void CompressorProxy::slot(KeySymbol sym, KeyModifier mod, bool isAutoRepeat)
1063 {
1064         if (emitCheck(isAutoRepeat))
1065                 Q_EMIT signal(sym, mod);
1066         else
1067                 LYXERR(Debug::KEY, "system is busy: autoRepeat key event ignored");
1068 }
1069
1070
1071 void GuiWorkArea::keyPressEvent(QKeyEvent * ev)
1072 {
1073         // this is also called for ShortcutOverride events. In this case, one must
1074         // not act but simply accept the event explicitly.
1075         bool const act = (ev->type() != QEvent::ShortcutOverride);
1076
1077         // Do not process here some keys if dialog_mode_ is set
1078         bool const for_dialog_mode = d->dialog_mode_
1079                 && (ev->modifiers() == Qt::NoModifier
1080                     || ev->modifiers() == Qt::ShiftModifier)
1081                 && (ev->key() == Qt::Key_Escape
1082                     || ev->key() == Qt::Key_Enter
1083                     || ev->key() == Qt::Key_Return);
1084         // also do not use autoRepeat to input shortcuts
1085         bool const autoRepeat = ev->isAutoRepeat();
1086
1087         if (for_dialog_mode || (!act && autoRepeat)) {
1088                 ev->ignore();
1089                 return;
1090         }
1091
1092         // intercept some keys if completion popup is visible
1093         if (d->completer_->popupVisible()) {
1094                 switch (ev->key()) {
1095                 case Qt::Key_Enter:
1096                 case Qt::Key_Return:
1097                         if (act)
1098                                 d->completer_->activate();
1099                         ev->accept();
1100                         return;
1101                 }
1102         }
1103
1104         KeyModifier const m = q_key_state(ev->modifiers());
1105
1106         if (act && lyxerr.debugging(Debug::KEY)) {
1107                 std::string str;
1108                 if (m & ShiftModifier)
1109                         str += "Shift-";
1110                 if (m & ControlModifier)
1111                         str += "Control-";
1112                 if (m & AltModifier)
1113                         str += "Alt-";
1114                 if (m & MetaModifier)
1115                         str += "Meta-";
1116                 LYXERR(Debug::KEY, " count: " << ev->count() << " text: " << ev->text()
1117                        << " isAutoRepeat: " << ev->isAutoRepeat() << " key: " << ev->key()
1118                        << " keyState: " << str);
1119         }
1120
1121         KeySymbol sym;
1122         setKeySymbol(&sym, ev);
1123         if (sym.isOK()) {
1124                 if (act) {
1125                         Q_EMIT compressKeySym(sym, m, autoRepeat);
1126                         ev->accept();
1127                 } else
1128                         // here, !autoRepeat, as determined at the beginning
1129                         ev->setAccepted(queryKeySym(sym, m));
1130         } else {
1131                 ev->ignore();
1132         }
1133 }
1134
1135
1136 void GuiWorkArea::doubleClickTimeout()
1137 {
1138         d->dc_event_.active = false;
1139 }
1140
1141
1142 void GuiWorkArea::mouseDoubleClickEvent(QMouseEvent * ev)
1143 {
1144         d->dc_event_ = DoubleClick(ev);
1145         QTimer::singleShot(QApplication::doubleClickInterval(), this,
1146                         SLOT(doubleClickTimeout()));
1147         FuncRequest cmd(LFUN_MOUSE_DOUBLE, ev->x(), ev->y(),
1148                         q_button_state(ev->button()), q_key_state(ev->modifiers()));
1149         d->dispatch(cmd);
1150         ev->accept();
1151 }
1152
1153
1154 void GuiWorkArea::resizeEvent(QResizeEvent * ev)
1155 {
1156         QAbstractScrollArea::resizeEvent(ev);
1157         d->need_resize_ = true;
1158         ev->accept();
1159 }
1160
1161
1162 void GuiWorkArea::Private::paintPreeditText(GuiPainter & pain)
1163 {
1164         if (preedit_string_.empty())
1165                 return;
1166
1167         // FIXME: shall we use real_current_font here? (see #10478)
1168         FontInfo const font = buffer_view_->cursor().getFont().fontInfo();
1169         FontMetrics const & fm = theFontMetrics(font);
1170         int const height = fm.maxHeight();
1171         int cur_x = caret_->rect().left();
1172         int cur_y = caret_->rect().bottom();
1173
1174         // get attributes of input method cursor.
1175         // cursor_pos : cursor position in preedit string.
1176         size_t cursor_pos = 0;
1177         bool cursor_is_visible = false;
1178         for (auto const & attr : preedit_attr_) {
1179                 if (attr.type == QInputMethodEvent::Cursor) {
1180                         cursor_pos = attr.start;
1181                         cursor_is_visible = attr.length != 0;
1182                         break;
1183                 }
1184         }
1185
1186         size_t const preedit_length = preedit_string_.length();
1187
1188         // get position of selection in input method.
1189         // FIXME: isn't there a way to do this simplier?
1190         // rStart : cursor position in selected string in IM.
1191         size_t rStart = 0;
1192         // rLength : selected string length in IM.
1193         size_t rLength = 0;
1194         if (cursor_pos < preedit_length) {
1195                 for (auto const & attr : preedit_attr_) {
1196                         if (attr.type == QInputMethodEvent::TextFormat) {
1197                                 if (attr.start <= int(cursor_pos)
1198                                         && int(cursor_pos) < attr.start + attr.length) {
1199                                                 rStart = attr.start;
1200                                                 rLength = attr.length;
1201                                                 if (!cursor_is_visible)
1202                                                         cursor_pos += rLength;
1203                                                 break;
1204                                 }
1205                         }
1206                 }
1207         }
1208         else {
1209                 rStart = cursor_pos;
1210                 rLength = 0;
1211         }
1212
1213         int const right_margin = buffer_view_->rightMargin();
1214         Painter::preedit_style ps;
1215         // Most often there would be only one line:
1216         preedit_lines_ = 1;
1217         for (size_t pos = 0; pos != preedit_length; ++pos) {
1218                 char_type const typed_char = preedit_string_[pos];
1219                 // reset preedit string style
1220                 ps = Painter::preedit_default;
1221
1222                 // if we reached the right extremity of the screen, go to next line.
1223                 if (cur_x + fm.width(typed_char) > p->viewport()->width() - right_margin) {
1224                         cur_x = right_margin;
1225                         cur_y += height + 1;
1226                         ++preedit_lines_;
1227                 }
1228                 // preedit strings are displayed with dashed underline
1229                 // and partial strings are displayed white on black indicating
1230                 // that we are in selecting mode in the input method.
1231                 // FIXME: rLength == preedit_length is not a changing condition
1232                 // FIXME: should be put out of the loop.
1233                 if (pos >= rStart
1234                         && pos < rStart + rLength
1235                         && !(cursor_pos < rLength && rLength == preedit_length))
1236                         ps = Painter::preedit_selecting;
1237
1238                 if (pos == cursor_pos
1239                         && (cursor_pos < rLength && rLength == preedit_length))
1240                         ps = Painter::preedit_cursor;
1241
1242                 // draw one character and update cur_x.
1243                 cur_x += pain.preeditText(cur_x, cur_y, typed_char, font, ps);
1244         }
1245 }
1246
1247
1248 void GuiWorkArea::paintEvent(QPaintEvent * ev)
1249 {
1250         // LYXERR(Debug::PAINTING, "paintEvent begin: x: " << rc.x()
1251         //      << " y: " << rc.y() << " w: " << rc.width() << " h: " << rc.height());
1252
1253         if (d->need_resize_ || pixelRatio() != d->last_pixel_ratio_) {
1254                 d->resetScreen();
1255                 d->resizeBufferView();
1256         }
1257
1258         d->last_pixel_ratio_ = pixelRatio();
1259
1260         GuiPainter pain(d->screenDevice(), pixelRatio());
1261
1262         d->buffer_view_->draw(pain, d->caret_visible_);
1263
1264         // The preedit text, if needed
1265         d->paintPreeditText(pain);
1266
1267         // and the caret
1268         if (d->caret_visible_)
1269                 d->caret_->draw(pain);
1270
1271         d->updateScreen(ev->rect());
1272
1273         ev->accept();
1274 }
1275
1276
1277 void GuiWorkArea::inputMethodEvent(QInputMethodEvent * e)
1278 {
1279         LYXERR(Debug::KEY, "preeditString: " << e->preeditString()
1280                    << " commitString: " << e->commitString());
1281
1282         // insert the processed text in the document (handles undo)
1283         if (!e->commitString().isEmpty()) {
1284                 d->buffer_view_->cursor().beginUndoGroup();
1285                 d->buffer_view_->cursor().insert(qstring_to_ucs4(e->commitString()));
1286                 d->buffer_view_->updateMetrics();
1287                 d->buffer_view_->cursor().endUndoGroup();
1288                 d->updateCaretGeometry();
1289                 viewport()->update();
1290         }
1291
1292         // Hide the caret during the test transformation.
1293         if (e->preeditString().isEmpty())
1294                 startBlinkingCaret();
1295         else
1296                 stopBlinkingCaret();
1297
1298         if (d->preedit_string_.empty() && e->preeditString().isEmpty()) {
1299                 // Nothing to do
1300                 e->accept();
1301                 return;
1302         }
1303
1304         // The preedit text and its attributes will be used in paintPreeditText
1305         d->preedit_string_ = qstring_to_ucs4(e->preeditString());
1306         d->preedit_attr_ = e->attributes();
1307
1308
1309         // redraw area of preedit string.
1310         int height = d->caret_->rect().height();
1311         int cur_y = d->caret_->rect().bottom();
1312         viewport()->update(0, cur_y - height, viewport()->width(),
1313                 (height + 1) * d->preedit_lines_);
1314
1315         if (d->preedit_string_.empty()) {
1316                 d->preedit_lines_ = 1;
1317                 e->accept();
1318                 return;
1319         }
1320
1321         // Don't forget to accept the event!
1322         e->accept();
1323 }
1324
1325
1326 QVariant GuiWorkArea::inputMethodQuery(Qt::InputMethodQuery query) const
1327 {
1328         QRect cur_r(0, 0, 0, 0);
1329         switch (query) {
1330                 // this is the CJK-specific composition window position and
1331                 // the context menu position when the menu key is pressed.
1332                 case Qt::ImMicroFocus:
1333                         cur_r = d->caret_->rect();
1334                         if (d->preedit_lines_ != 1)
1335                                 cur_r.moveLeft(10);
1336                         cur_r.moveBottom(cur_r.bottom()
1337                                 + cur_r.height() * (d->preedit_lines_ - 1));
1338                         // return lower right of caret in LyX.
1339                         return cur_r;
1340                 default:
1341                         return QWidget::inputMethodQuery(query);
1342         }
1343 }
1344
1345
1346 void GuiWorkArea::updateWindowTitle()
1347 {
1348         Buffer const & buf = bufferView().buffer();
1349         if (buf.fileName() != d->file_name_
1350             || buf.params().shell_escape != d->shell_escape_
1351             || buf.hasReadonlyFlag() != d->read_only_
1352             || buf.lyxvc().vcstatus() != d->vc_status_
1353             || buf.isClean() != d->clean_
1354             || buf.notifiesExternalModification() != d->externally_modified_) {
1355                 d->file_name_ = buf.fileName();
1356                 d->shell_escape_ = buf.params().shell_escape;
1357                 d->read_only_ = buf.hasReadonlyFlag();
1358                 d->vc_status_ = buf.lyxvc().vcstatus();
1359                 d->clean_ = buf.isClean();
1360                 d->externally_modified_ = buf.notifiesExternalModification();
1361                 Q_EMIT titleChanged(this);
1362         }
1363 }
1364
1365
1366 bool GuiWorkArea::isFullScreen() const
1367 {
1368         return d->lyx_view_ && d->lyx_view_->isFullScreen();
1369 }
1370
1371
1372 bool GuiWorkArea::inDialogMode() const
1373 {
1374         return d->dialog_mode_;
1375 }
1376
1377
1378 void GuiWorkArea::setDialogMode(bool mode)
1379 {
1380         d->dialog_mode_ = mode;
1381 }
1382
1383
1384 GuiCompleter & GuiWorkArea::completer()
1385 {
1386         return *d->completer_;
1387 }
1388
1389 GuiView const & GuiWorkArea::view() const
1390 {
1391         return *d->lyx_view_;
1392 }
1393
1394
1395 GuiView & GuiWorkArea::view()
1396 {
1397         return *d->lyx_view_;
1398 }
1399
1400 ////////////////////////////////////////////////////////////////////
1401 //
1402 // EmbeddedWorkArea
1403 //
1404 ////////////////////////////////////////////////////////////////////
1405
1406
1407 EmbeddedWorkArea::EmbeddedWorkArea(QWidget * w): GuiWorkArea(w)
1408 {
1409         support::TempFile tempfile("embedded.internal");
1410         tempfile.setAutoRemove(false);
1411         buffer_ = theBufferList().newInternalBuffer(tempfile.name().absFileName());
1412         buffer_->setUnnamed(true);
1413         buffer_->setFullyLoaded(true);
1414         setBuffer(*buffer_);
1415         setDialogMode(true);
1416 }
1417
1418
1419 EmbeddedWorkArea::~EmbeddedWorkArea()
1420 {
1421         // No need to destroy buffer and bufferview here, because it is done
1422         // in theBufferList() destruction loop at application exit
1423 }
1424
1425
1426 void EmbeddedWorkArea::closeEvent(QCloseEvent * ev)
1427 {
1428         disable();
1429         GuiWorkArea::closeEvent(ev);
1430 }
1431
1432
1433 void EmbeddedWorkArea::hideEvent(QHideEvent * ev)
1434 {
1435         disable();
1436         GuiWorkArea::hideEvent(ev);
1437 }
1438
1439
1440 QSize EmbeddedWorkArea::sizeHint () const
1441 {
1442         // FIXME(?):
1443         // GuiWorkArea sets the size to the screen's viewport
1444         // by returning a value this gets overridden
1445         // EmbeddedWorkArea is now sized to fit in the layout
1446         // of the parent, and has a minimum size set in GuiWorkArea
1447         // which is what we return here
1448         return QSize(100, 70);
1449 }
1450
1451
1452 void EmbeddedWorkArea::disable()
1453 {
1454         stopBlinkingCaret();
1455         if (view().currentWorkArea() != this)
1456                 return;
1457         // No problem if currentMainWorkArea() is 0 (setCurrentWorkArea()
1458         // tolerates it and shows the background logo), what happens if
1459         // an EmbeddedWorkArea is closed after closing all document WAs
1460         view().setCurrentWorkArea(view().currentMainWorkArea());
1461 }
1462
1463 ////////////////////////////////////////////////////////////////////
1464 //
1465 // TabWorkArea
1466 //
1467 ////////////////////////////////////////////////////////////////////
1468
1469 #ifdef Q_OS_MAC
1470 class NoTabFrameMacStyle : public QProxyStyle {
1471 public:
1472         ///
1473         QRect subElementRect(SubElement element, const QStyleOption * option,
1474                              const QWidget * widget = 0) const
1475         {
1476                 QRect rect = QProxyStyle::subElementRect(element, option, widget);
1477                 bool noBar = static_cast<QTabWidget const *>(widget)->count() <= 1;
1478
1479                 // The Qt Mac style puts the contents into a 3 pixel wide box
1480                 // which looks very ugly and not like other Mac applications.
1481                 // Hence we remove this here, and moreover the 16 pixel round
1482                 // frame above if the tab bar is hidden.
1483                 if (element == QStyle::SE_TabWidgetTabContents) {
1484                         rect.adjust(- rect.left(), 0, rect.left(), 0);
1485                         if (noBar)
1486                                 rect.setTop(0);
1487                 }
1488
1489                 return rect;
1490         }
1491 };
1492
1493 NoTabFrameMacStyle noTabFrameMacStyle;
1494 #endif
1495
1496
1497 TabWorkArea::TabWorkArea(QWidget * parent)
1498         : QTabWidget(parent), clicked_tab_(-1), midpressed_tab_(-1)
1499 {
1500 #ifdef Q_OS_MAC
1501         setStyle(&noTabFrameMacStyle);
1502 #endif
1503
1504         QPalette pal = palette();
1505         pal.setColor(QPalette::Active, QPalette::Button,
1506                 pal.color(QPalette::Active, QPalette::Window));
1507         pal.setColor(QPalette::Disabled, QPalette::Button,
1508                 pal.color(QPalette::Disabled, QPalette::Window));
1509         pal.setColor(QPalette::Inactive, QPalette::Button,
1510                 pal.color(QPalette::Inactive, QPalette::Window));
1511
1512         QObject::connect(this, SIGNAL(currentChanged(int)),
1513                 this, SLOT(on_currentTabChanged(int)));
1514
1515         closeBufferButton = new QToolButton(this);
1516         closeBufferButton->setPalette(pal);
1517         // FIXME: rename the icon to closebuffer.png
1518         closeBufferButton->setIcon(QIcon(getPixmap("images/", "closetab", "svgz,png")));
1519         closeBufferButton->setText("Close File");
1520         closeBufferButton->setAutoRaise(true);
1521         closeBufferButton->setCursor(Qt::ArrowCursor);
1522         closeBufferButton->setToolTip(qt_("Close File"));
1523         closeBufferButton->setEnabled(true);
1524         QObject::connect(closeBufferButton, SIGNAL(clicked()),
1525                 this, SLOT(closeCurrentBuffer()));
1526         setCornerWidget(closeBufferButton, Qt::TopRightCorner);
1527
1528         // setup drag'n'drop
1529         QTabBar* tb = new DragTabBar;
1530         connect(tb, SIGNAL(tabMoveRequested(int, int)),
1531                 this, SLOT(moveTab(int, int)));
1532         tb->setElideMode(Qt::ElideNone);
1533         setTabBar(tb);
1534
1535         // make us responsible for the context menu of the tabbar
1536         tb->setContextMenuPolicy(Qt::CustomContextMenu);
1537         connect(tb, SIGNAL(customContextMenuRequested(const QPoint &)),
1538                 this, SLOT(showContextMenu(const QPoint &)));
1539         connect(tb, SIGNAL(tabCloseRequested(int)),
1540                 this, SLOT(closeTab(int)));
1541
1542         setUsesScrollButtons(true);
1543 }
1544
1545
1546 void TabWorkArea::mousePressEvent(QMouseEvent *me)
1547 {
1548         if (me->button() == Qt::MidButton)
1549                 midpressed_tab_ = tabBar()->tabAt(me->pos());
1550         else
1551                 QTabWidget::mousePressEvent(me);
1552 }
1553
1554
1555 void TabWorkArea::mouseReleaseEvent(QMouseEvent *me)
1556 {
1557         if (me->button() == Qt::MidButton) {
1558                 int const midreleased_tab = tabBar()->tabAt(me->pos());
1559                 if (midpressed_tab_ == midreleased_tab && posIsTab(me->pos()))
1560                         closeTab(midreleased_tab);
1561         } else
1562                 QTabWidget::mouseReleaseEvent(me);
1563 }
1564
1565
1566 void TabWorkArea::paintEvent(QPaintEvent * event)
1567 {
1568         if (tabBar()->isVisible()) {
1569                 QTabWidget::paintEvent(event);
1570         } else {
1571                 // Prevent the selected tab to influence the
1572                 // painting of the frame of the tab widget.
1573                 // This is needed for gtk style in Qt.
1574                 QStylePainter p(this);
1575 #if QT_VERSION < 0x050000
1576                 QStyleOptionTabWidgetFrameV2 opt;
1577 #else
1578                 QStyleOptionTabWidgetFrame opt;
1579 #endif
1580                 initStyleOption(&opt);
1581                 opt.rect = style()->subElementRect(QStyle::SE_TabWidgetTabPane,
1582                         &opt, this);
1583                 opt.selectedTabRect = QRect();
1584                 p.drawPrimitive(QStyle::PE_FrameTabWidget, opt);
1585         }
1586 }
1587
1588
1589 bool TabWorkArea::posIsTab(QPoint position)
1590 {
1591         // tabAt returns -1 if tab does not covers position
1592         return tabBar()->tabAt(position) > -1;
1593 }
1594
1595
1596 void TabWorkArea::mouseDoubleClickEvent(QMouseEvent * event)
1597 {
1598         if (event->button() != Qt::LeftButton)
1599                 return;
1600
1601         // this code chunk is unnecessary because it seems the event only makes
1602         // it this far if it is not on a tab. I'm not sure why this is (maybe
1603         // it is handled and ended in DragTabBar?), and thus I'm not sure if
1604         // this is true in all cases and if it will be true in the future so I
1605         // leave this code for now. (skostysh, 2016-07-21)
1606         //
1607         // return early if double click on existing tabs
1608         if (posIsTab(event->pos()))
1609                 return;
1610
1611         dispatch(FuncRequest(LFUN_BUFFER_NEW));
1612 }
1613
1614
1615 void TabWorkArea::setFullScreen(bool full_screen)
1616 {
1617         for (int i = 0; i != count(); ++i) {
1618                 if (GuiWorkArea * wa = workArea(i))
1619                         wa->setFullScreen(full_screen);
1620         }
1621
1622         if (lyxrc.full_screen_tabbar)
1623                 showBar(!full_screen && count() > 1);
1624         else
1625                 showBar(count() > 1);
1626 }
1627
1628
1629 void TabWorkArea::showBar(bool show)
1630 {
1631         tabBar()->setEnabled(show);
1632         tabBar()->setVisible(show);
1633         closeBufferButton->setVisible(show && lyxrc.single_close_tab_button);
1634         setTabsClosable(!lyxrc.single_close_tab_button);
1635 }
1636
1637
1638 GuiWorkAreaContainer * TabWorkArea::widget(int index) const
1639 {
1640         QWidget * w = QTabWidget::widget(index);
1641         if (!w)
1642                 return nullptr;
1643         GuiWorkAreaContainer * wac = dynamic_cast<GuiWorkAreaContainer *>(w);
1644         LATTEST(wac);
1645         return wac;
1646 }
1647
1648
1649 GuiWorkAreaContainer * TabWorkArea::currentWidget() const
1650 {
1651         return widget(currentIndex());
1652 }
1653
1654
1655 GuiWorkArea * TabWorkArea::workArea(int index) const
1656 {
1657         GuiWorkAreaContainer * w = widget(index);
1658         if (!w)
1659                 return nullptr;
1660         return w->workArea();
1661 }
1662
1663
1664 GuiWorkArea * TabWorkArea::currentWorkArea() const
1665 {
1666         return workArea(currentIndex());
1667 }
1668
1669
1670 GuiWorkArea * TabWorkArea::workArea(Buffer & buffer) const
1671 {
1672         // FIXME: this method doesn't work if we have more than one work area
1673         // showing the same buffer.
1674         for (int i = 0; i != count(); ++i) {
1675                 GuiWorkArea * wa = workArea(i);
1676                 LASSERT(wa, return 0);
1677                 if (&wa->bufferView().buffer() == &buffer)
1678                         return wa;
1679         }
1680         return 0;
1681 }
1682
1683
1684 void TabWorkArea::closeAll()
1685 {
1686         while (count()) {
1687                 QWidget * wac = widget(0);
1688                 LASSERT(wac, return);
1689                 removeTab(0);
1690                 delete wac;
1691         }
1692 }
1693
1694
1695 int TabWorkArea::indexOfWorkArea(GuiWorkArea * w) const
1696 {
1697         for (int index = 0; index < count(); ++index)
1698                 if (workArea(index) == w)
1699                         return index;
1700         return -1;
1701 }
1702
1703
1704 bool TabWorkArea::setCurrentWorkArea(GuiWorkArea * work_area)
1705 {
1706         LASSERT(work_area, return false);
1707         int index = indexOfWorkArea(work_area);
1708         if (index == -1)
1709                 return false;
1710
1711         if (index == currentIndex())
1712                 // Make sure the work area is up to date.
1713                 on_currentTabChanged(index);
1714         else
1715                 // Switch to the work area.
1716                 setCurrentIndex(index);
1717         work_area->setFocus();
1718
1719         return true;
1720 }
1721
1722
1723 GuiWorkArea * TabWorkArea::addWorkArea(Buffer & buffer, GuiView & view)
1724 {
1725         GuiWorkArea * wa = new GuiWorkArea(buffer, view);
1726         GuiWorkAreaContainer * wac = new GuiWorkAreaContainer(wa);
1727         wa->setUpdatesEnabled(false);
1728         // Hide tabbar if there's no tab (avoid a resize and a flashing tabbar
1729         // when hiding it again below).
1730         if (!(currentWorkArea() && currentWorkArea()->isFullScreen()))
1731                 showBar(count() > 0);
1732         addTab(wac, wa->windowTitle());
1733         QObject::connect(wa, SIGNAL(titleChanged(GuiWorkArea *)),
1734                 this, SLOT(updateTabTexts()));
1735         if (currentWorkArea() && currentWorkArea()->isFullScreen())
1736                 setFullScreen(true);
1737         else
1738                 // Hide tabbar if there's only one tab.
1739                 showBar(count() > 1);
1740
1741         updateTabTexts();
1742
1743         return wa;
1744 }
1745
1746
1747 bool TabWorkArea::removeWorkArea(GuiWorkArea * work_area)
1748 {
1749         LASSERT(work_area, return false);
1750         int index = indexOfWorkArea(work_area);
1751         if (index == -1)
1752                 return false;
1753
1754         work_area->setUpdatesEnabled(false);
1755         QWidget * wac = widget(index);
1756         removeTab(index);
1757         delete wac;
1758
1759         if (count()) {
1760                 // make sure the next work area is enabled.
1761                 currentWidget()->setUpdatesEnabled(true);
1762                 if (currentWorkArea() && currentWorkArea()->isFullScreen())
1763                         setFullScreen(true);
1764                 else
1765                         // Show tabbar only if there's more than one tab.
1766                         showBar(count() > 1);
1767         } else
1768                 lastWorkAreaRemoved();
1769
1770         updateTabTexts();
1771
1772         return true;
1773 }
1774
1775
1776 void TabWorkArea::on_currentTabChanged(int i)
1777 {
1778         // returns e.g. on application destruction
1779         if (i == -1)
1780                 return;
1781         GuiWorkArea * wa = workArea(i);
1782         LASSERT(wa, return);
1783         wa->setUpdatesEnabled(true);
1784         wa->scheduleRedraw(true);
1785         wa->setFocus();
1786         ///
1787         currentWorkAreaChanged(wa);
1788
1789         LYXERR(Debug::GUI, "currentTabChanged " << i
1790                 << " File: " << wa->bufferView().buffer().absFileName());
1791 }
1792
1793
1794 void TabWorkArea::closeCurrentBuffer()
1795 {
1796         GuiWorkArea * wa;
1797         if (clicked_tab_ == -1)
1798                 wa = currentWorkArea();
1799         else {
1800                 wa = workArea(clicked_tab_);
1801                 LASSERT(wa, return);
1802         }
1803         wa->view().closeWorkArea(wa);
1804 }
1805
1806
1807 void TabWorkArea::hideCurrentTab()
1808 {
1809         GuiWorkArea * wa;
1810         if (clicked_tab_ == -1)
1811                 wa = currentWorkArea();
1812         else {
1813                 wa = workArea(clicked_tab_);
1814                 LASSERT(wa, return);
1815         }
1816         wa->view().hideWorkArea(wa);
1817 }
1818
1819
1820 void TabWorkArea::closeTab(int index)
1821 {
1822         on_currentTabChanged(index);
1823         GuiWorkArea * wa;
1824         if (index == -1)
1825                 wa = currentWorkArea();
1826         else {
1827                 wa = workArea(index);
1828                 LASSERT(wa, return);
1829         }
1830         wa->view().closeWorkArea(wa);
1831 }
1832
1833
1834 ///
1835 class DisplayPath {
1836 public:
1837         /// make vector happy
1838         DisplayPath() : tab_(-1), dottedPrefix_(false) {}
1839         ///
1840         DisplayPath(int tab, FileName const & filename)
1841                 : tab_(tab)
1842         {
1843                 filename_ = (filename.extension() == "lyx") ?
1844                         toqstr(filename.onlyFileNameWithoutExt())
1845                         : toqstr(filename.onlyFileName());
1846                 postfix_ = toqstr(filename.absoluteFilePath()).
1847                         split("/", QString::SkipEmptyParts);
1848                 postfix_.pop_back();
1849                 abs_ = toqstr(filename.absoluteFilePath());
1850                 dottedPrefix_ = false;
1851         }
1852
1853         /// Absolute path for debugging.
1854         QString abs() const
1855         {
1856                 return abs_;
1857         }
1858         /// Add the first segment from the postfix or three dots to the prefix.
1859         /// Merge multiple dot tripples. In fact dots are added lazily, i.e. only
1860         /// when really needed.
1861         void shiftPathSegment(bool dotted)
1862         {
1863                 if (postfix_.count() <= 0)
1864                         return;
1865
1866                 if (!dotted) {
1867                         if (dottedPrefix_ && !prefix_.isEmpty())
1868                                 prefix_ += ellipsisSlash_;
1869                         prefix_ += postfix_.front() + "/";
1870                 }
1871                 dottedPrefix_ = dotted && !prefix_.isEmpty();
1872                 postfix_.pop_front();
1873         }
1874         ///
1875         QString displayString() const
1876         {
1877                 if (prefix_.isEmpty())
1878                         return filename_;
1879
1880                 bool dots = dottedPrefix_ || !postfix_.isEmpty();
1881                 return prefix_ + (dots ? ellipsisSlash_ : "") + filename_;
1882         }
1883         ///
1884         QString forecastPathString() const
1885         {
1886                 if (postfix_.count() == 0)
1887                         return displayString();
1888
1889                 return prefix_
1890                         + (dottedPrefix_ ? ellipsisSlash_ : "")
1891                         + postfix_.front() + "/";
1892         }
1893         ///
1894         bool final() const { return postfix_.empty(); }
1895         ///
1896         int tab() const { return tab_; }
1897
1898 private:
1899         /// ".../"
1900         static QString const ellipsisSlash_;
1901         ///
1902         QString prefix_;
1903         ///
1904         QStringList postfix_;
1905         ///
1906         QString filename_;
1907         ///
1908         QString abs_;
1909         ///
1910         int tab_;
1911         ///
1912         bool dottedPrefix_;
1913 };
1914
1915
1916 QString const DisplayPath::ellipsisSlash_ = QString(QChar(0x2026)) + "/";
1917
1918
1919 ///
1920 bool operator<(DisplayPath const & a, DisplayPath const & b)
1921 {
1922         return a.displayString() < b.displayString();
1923 }
1924
1925 ///
1926 bool operator==(DisplayPath const & a, DisplayPath const & b)
1927 {
1928         return a.displayString() == b.displayString();
1929 }
1930
1931
1932 void TabWorkArea::updateTabTexts()
1933 {
1934         size_t n = count();
1935         if (n == 0)
1936                 return;
1937         std::list<DisplayPath> paths;
1938         typedef std::list<DisplayPath>::iterator It;
1939
1940         // collect full names first: path into postfix, empty prefix and
1941         // filename without extension
1942         for (size_t i = 0; i < n; ++i) {
1943                 GuiWorkArea * i_wa = workArea(i);
1944                 FileName const fn = i_wa->bufferView().buffer().fileName();
1945                 paths.push_back(DisplayPath(i, fn));
1946         }
1947
1948         // go through path segments and see if it helps to make the path more unique
1949         bool somethingChanged = true;
1950         bool allFinal = false;
1951         while (somethingChanged && !allFinal) {
1952                 // adding path segments changes order
1953                 paths.sort();
1954
1955                 LYXERR(Debug::GUI, "updateTabTexts() iteration start");
1956                 somethingChanged = false;
1957                 allFinal = true;
1958
1959                 // find segments which are not unique (i.e. non-atomic)
1960                 It it = paths.begin();
1961                 It segStart = it;
1962                 QString segString = it->displayString();
1963                 for (; it != paths.end(); ++it) {
1964                         // look to the next item
1965                         It next = it;
1966                         ++next;
1967
1968                         // final?
1969                         allFinal = allFinal && it->final();
1970
1971                         LYXERR(Debug::GUI, "it = " << it->abs()
1972                                << " => " << it->displayString());
1973
1974                         // still the same segment?
1975                         QString nextString;
1976                         if ((next != paths.end()
1977                              && (nextString = next->displayString()) == segString))
1978                                 continue;
1979                         LYXERR(Debug::GUI, "segment ended");
1980
1981                         // only a trivial one with one element?
1982                         if (it == segStart) {
1983                                 // start new segment
1984                                 segStart = next;
1985                                 segString = nextString;
1986                                 continue;
1987                         }
1988
1989                         // We found a non-atomic segment
1990                         // We know that segStart <= it < next <= paths.end().
1991                         // The assertion below tells coverity about it.
1992                         LATTEST(segStart != paths.end());
1993                         QString dspString = segStart->forecastPathString();
1994                         LYXERR(Debug::GUI, "first forecast found for "
1995                                << segStart->abs() << " => " << dspString);
1996                         It sit = segStart;
1997                         ++sit;
1998                         // Shift path segments and hope for the best
1999                         // that it makes the path more unique.
2000                         somethingChanged = true;
2001                         bool moreUnique = false;
2002                         for (; sit != next; ++sit) {
2003                                 if (sit->forecastPathString() != dspString) {
2004                                         LYXERR(Debug::GUI, "different forecast found for "
2005                                                 << sit->abs() << " => " << sit->forecastPathString());
2006                                         moreUnique = true;
2007                                         break;
2008                                 }
2009                                 LYXERR(Debug::GUI, "same forecast found for "
2010                                         << sit->abs() << " => " << dspString);
2011                         }
2012
2013                         // if the path segment helped, add it. Otherwise add dots
2014                         bool dots = !moreUnique;
2015                         LYXERR(Debug::GUI, "using dots = " << dots);
2016                         for (sit = segStart; sit != next; ++sit) {
2017                                 sit->shiftPathSegment(dots);
2018                                 LYXERR(Debug::GUI, "shifting "
2019                                         << sit->abs() << " => " << sit->displayString());
2020                         }
2021
2022                         // start new segment
2023                         segStart = next;
2024                         segString = nextString;
2025                 }
2026         }
2027
2028         // set new tab titles
2029         for (It it = paths.begin(); it != paths.end(); ++it) {
2030                 int const tab_index = it->tab();
2031                 Buffer const & buf = workArea(tab_index)->bufferView().buffer();
2032                 QString tab_text = it->displayString().replace("&", "&&");
2033                 if (!buf.fileName().empty() && !buf.isClean())
2034                         tab_text += "*";
2035                 QString tab_tooltip = it->abs();
2036                 if (buf.hasReadonlyFlag()) {
2037                         setTabIcon(tab_index, QIcon(getPixmap("images/", "emblem-readonly", "svgz,png")));
2038                         tab_tooltip = qt_("%1 (read only)").arg(tab_tooltip);
2039                 } else
2040                         setTabIcon(tab_index, QIcon());
2041                 if (buf.notifiesExternalModification()) {
2042                         QString const warn = qt_("%1 (modified externally)");
2043                         tab_tooltip = warn.arg(tab_tooltip);
2044                         tab_text += QChar(0x26a0);
2045                 }
2046                 setTabText(tab_index, tab_text);
2047                 setTabToolTip(tab_index, tab_tooltip);
2048         }
2049 }
2050
2051
2052 void TabWorkArea::showContextMenu(const QPoint & pos)
2053 {
2054         // which tab?
2055         clicked_tab_ = static_cast<DragTabBar *>(tabBar())->tabAt(pos);
2056         if (clicked_tab_ == -1)
2057                 return;
2058
2059         // show tab popup
2060         QMenu popup;
2061         popup.addAction(QIcon(getPixmap("images/", "hidetab", "svgz,png")),
2062                 qt_("Hide tab"), this, SLOT(hideCurrentTab()));
2063         popup.addAction(QIcon(getPixmap("images/", "closetab", "svgz,png")),
2064                 qt_("Close tab"), this, SLOT(closeCurrentBuffer()));
2065         popup.exec(tabBar()->mapToGlobal(pos));
2066
2067         clicked_tab_ = -1;
2068 }
2069
2070
2071 void TabWorkArea::moveTab(int fromIndex, int toIndex)
2072 {
2073         QWidget * w = widget(fromIndex);
2074         QIcon icon = tabIcon(fromIndex);
2075         QString text = tabText(fromIndex);
2076
2077         setCurrentIndex(fromIndex);
2078         removeTab(fromIndex);
2079         insertTab(toIndex, w, icon, text);
2080         setCurrentIndex(toIndex);
2081 }
2082
2083
2084 DragTabBar::DragTabBar(QWidget* parent)
2085         : QTabBar(parent)
2086 {
2087         setAcceptDrops(true);
2088         setTabsClosable(!lyxrc.single_close_tab_button);
2089 }
2090
2091
2092 void DragTabBar::mousePressEvent(QMouseEvent * event)
2093 {
2094         if (event->button() == Qt::LeftButton)
2095                 dragStartPos_ = event->pos();
2096         QTabBar::mousePressEvent(event);
2097 }
2098
2099
2100 void DragTabBar::mouseMoveEvent(QMouseEvent * event)
2101 {
2102         // If the left button isn't pressed anymore then return
2103         if (!(event->buttons() & Qt::LeftButton))
2104                 return;
2105
2106         // If the distance is too small then return
2107         if ((event->pos() - dragStartPos_).manhattanLength()
2108             < QApplication::startDragDistance())
2109                 return;
2110
2111         // did we hit something after all?
2112         int tab = tabAt(dragStartPos_);
2113         if (tab == -1)
2114                 return;
2115
2116         // simulate button release to remove highlight from button
2117         int i = currentIndex();
2118         QMouseEvent me(QEvent::MouseButtonRelease, dragStartPos_,
2119                 event->button(), event->buttons(), 0);
2120         QTabBar::mouseReleaseEvent(&me);
2121         setCurrentIndex(i);
2122
2123         // initiate Drag
2124         QDrag * drag = new QDrag(this);
2125         QMimeData * mimeData = new QMimeData;
2126         // a crude way to distinguish tab-reodering drops from other ones
2127         mimeData->setData("action", "tab-reordering") ;
2128         drag->setMimeData(mimeData);
2129
2130         // get tab pixmap as cursor
2131         QRect r = tabRect(tab);
2132         QPixmap pixmap(r.size());
2133         render(&pixmap, - r.topLeft());
2134         drag->setPixmap(pixmap);
2135         drag->exec();
2136 }
2137
2138
2139 void DragTabBar::dragEnterEvent(QDragEnterEvent * event)
2140 {
2141         // Only accept if it's an tab-reordering request
2142         QMimeData const * m = event->mimeData();
2143         QStringList formats = m->formats();
2144         if (formats.contains("action")
2145             && m->data("action") == "tab-reordering")
2146                 event->acceptProposedAction();
2147 }
2148
2149
2150 void DragTabBar::dropEvent(QDropEvent * event)
2151 {
2152         int fromIndex = tabAt(dragStartPos_);
2153         int toIndex = tabAt(event->pos());
2154
2155         // Tell interested objects that
2156         if (fromIndex != toIndex)
2157                 tabMoveRequested(fromIndex, toIndex);
2158         event->acceptProposedAction();
2159 }
2160
2161
2162 GuiWorkAreaContainer::GuiWorkAreaContainer(GuiWorkArea * wa, QWidget * parent)
2163         : QWidget(parent), wa_(wa)
2164 {
2165         LASSERT(wa, return);
2166         Ui::WorkAreaUi::setupUi(this);
2167         layout()->addWidget(wa);
2168         connect(wa, SIGNAL(titleChanged(GuiWorkArea *)),
2169                 this, SLOT(updateDisplay()));
2170         connect(reloadPB, SIGNAL(clicked()), this, SLOT(reload()));
2171         connect(ignorePB, SIGNAL(clicked()), this, SLOT(ignore()));
2172         setMessageColour({notificationFrame}, {reloadPB, ignorePB});
2173         updateDisplay();
2174 }
2175
2176
2177 void GuiWorkAreaContainer::updateDisplay()
2178 {
2179         Buffer const & buf = wa_->bufferView().buffer();
2180         notificationFrame->setHidden(!buf.notifiesExternalModification());
2181         QString const label = qt_("<b>The file %1 changed on disk.</b>")
2182                 .arg(toqstr(buf.fileName().displayName()));
2183         externalModificationLabel->setText(label);
2184 }
2185
2186
2187 void GuiWorkAreaContainer::dispatch(FuncRequest f) const
2188 {
2189         lyx::dispatch(FuncRequest(LFUN_BUFFER_SWITCH,
2190                                   wa_->bufferView().buffer().absFileName()));
2191         lyx::dispatch(f);
2192 }
2193
2194
2195 void GuiWorkAreaContainer::reload() const
2196 {
2197         dispatch(FuncRequest(LFUN_BUFFER_RELOAD));
2198 }
2199
2200
2201 void GuiWorkAreaContainer::ignore() const
2202 {
2203         dispatch(FuncRequest(LFUN_BUFFER_EXTERNAL_MODIFICATION_CLEAR));
2204 }
2205
2206
2207 void GuiWorkAreaContainer::mouseDoubleClickEvent(QMouseEvent * event)
2208 {
2209         // prevent TabWorkArea from opening a new buffer on double click
2210         event->accept();
2211 }
2212
2213
2214 } // namespace frontend
2215 } // namespace lyx
2216
2217 #include "moc_GuiWorkArea.cpp"