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 "Menus.h"
  20
  21 #include "Buffer.h"
  22 #include "BufferList.h"
  23 #include "BufferParams.h"
  24 #include "BufferView.h"
  25 #include "CoordCache.h"
  26 #include "Cursor.h"
  27 #include "Font.h"
  28 #include "FuncRequest.h"
  29 #include "GuiApplication.h"
  30 #include "GuiCompleter.h"
  31 #include "GuiKeySymbol.h"
  32 #include "GuiPainter.h"
  33 #include "GuiView.h"
  34 #include "KeySymbol.h"
  35 #include "Language.h"
  36 #include "LyX.h"
  37 #include "LyXRC.h"
  38 #include "LyXVC.h"
  39 #include "qt_helpers.h"
  40 #include "Text.h"
  41 #include "TextMetrics.h"
  42 #include "version.h"
  43
  44 #include "graphics/GraphicsImage.h"
  45 #include "graphics/GraphicsLoader.h"
  46
  47 #include "support/convert.h"
  48 #include "support/debug.h"
  49 #include "support/gettext.h"
  50 #include "support/FileName.h"
  51 #include "support/lassert.h"
  52 #include "support/TempFile.h"
  53
  54 #include "frontends/Application.h"
  55 #include "frontends/FontMetrics.h"
  56 #include "frontends/WorkAreaManager.h"
  57
  58 #include <QContextMenuEvent>
  59 #if (QT_VERSION < 0x050000)
  60 #include <QInputContext>
  61 #endif
  62 #include <QDrag>
  63 #include <QHelpEvent>
  64 #ifdef Q_OS_MAC
  65 #include <QProxyStyle>
  66 #endif
  67 #include <QMainWindow>
  68 #include <QMimeData>
  69 #include <QMenu>
  70 #include <QPainter>
  71 #include <QPalette>
  72 #include <QPixmapCache>
  73 #include <QScrollBar>
  74 #include <QStyleOption>
  75 #include <QStylePainter>
  76 #include <QTimer>
  77 #include <QToolButton>
  78 #include <QToolTip>
  79 #include <QMenuBar>
  80
  81 #include "support/bind.h"
  82
  83 #include <cmath>
  84 #include <iostream>
  85
  86 int const TabIndicatorWidth = 3;
  87
  88 #undef KeyPress
  89 #undef NoModifier
  90
  91 using namespace std;
  92 using namespace lyx::support;
  93
  94 namespace lyx {
  95
  96
  97 /// return the LyX mouse button state from Qt's
  98 static mouse_button::state q_button_state(Qt::MouseButton button)
  99 {
 100         mouse_button::state b = mouse_button::none;
 101         switch (button) {
 102                 case Qt::LeftButton:
 103                         b = mouse_button::button1;
 104                         break;
 105                 case Qt::MidButton:
 106                         b = mouse_button::button2;
 107                         break;
 108                 case Qt::RightButton:
 109                         b = mouse_button::button3;
 110                         break;
 111                 default:
 112                         break;
 113         }
 114         return b;
 115 }
 116
 117
 118 /// return the LyX mouse button state from Qt's
 119 mouse_button::state q_motion_state(Qt::MouseButtons state)
 120 {
 121         mouse_button::state b = mouse_button::none;
 122         if (state & Qt::LeftButton)
 123                 b |= mouse_button::button1;
 124         if (state & Qt::MidButton)
 125                 b |= mouse_button::button2;
 126         if (state & Qt::RightButton)
 127                 b |= mouse_button::button3;
 128         return b;
 129 }
 130
 131
 132 namespace frontend {
 133
 134 class CursorWidget {
 135 public:
 136         CursorWidget() : rtl_(false), l_shape_(false), completable_(false),
 137                 show_(false), x_(0), cursor_width_(0)
 138         {
 139                 recomputeWidth();
 140         }
 141
 142         void draw(QPainter & painter)
 143         {
 144                 if (!show_ || !rect_.isValid())
 145                         return;
 146
 147                 int y = rect_.top();
 148                 int l = x_ - rect_.left();
 149                 int r = rect_.right() - x_;
 150                 int bot = rect_.bottom();
 151
 152                 // draw vertical line
 153                 painter.fillRect(x_, y, cursor_width_, rect_.height(), color_);
 154
 155                 // draw RTL/LTR indication
 156                 painter.setPen(color_);
 157                 if (l_shape_) {
 158                         if (rtl_)
 159                                 painter.drawLine(x_, bot, x_ - l, bot);
 160                         else
 161                                 painter.drawLine(x_, bot, x_ + cursor_width_ + r, bot);
 162                 }
 163
 164                 // draw completion triangle
 165                 if (completable_) {
 166                         int m = y + rect_.height() / 2;
 167                         int d = TabIndicatorWidth - 1;
 168                         if (rtl_) {
 169                                 painter.drawLine(x_ - 1, m - d, x_ - 1 - d, m);
 170                                 painter.drawLine(x_ - 1, m + d, x_ - 1 - d, m);
 171                         } else {
 172                                 painter.drawLine(x_ + cursor_width_, m - d, x_ + cursor_width_ + d, m);
 173                                 painter.drawLine(x_ + cursor_width_, m + d, x_ + cursor_width_ + d, m);
 174                         }
 175                 }
 176         }
 177
 178         void update(int x, int y, int h, bool l_shape,
 179                 bool rtl, bool completable)
 180         {
 181                 color_ = guiApp->colorCache().get(Color_cursor);
 182                 l_shape_ = l_shape;
 183                 rtl_ = rtl;
 184                 completable_ = completable;
 185                 x_ = x;
 186
 187                 // extension to left and right
 188                 int l = 0;
 189                 int r = 0;
 190
 191                 // RTL/LTR indication
 192                 if (l_shape_) {
 193                         if (rtl)
 194                                 l += h / 3;
 195                         else
 196                                 r += h / 3;
 197                 }
 198
 199                 // completion triangle
 200                 if (completable_) {
 201                         if (rtl)
 202                                 l = max(l, TabIndicatorWidth);
 203                         else
 204                                 r = max(r, TabIndicatorWidth);
 205                 }
 206
 207                 // compute overall rectangle
 208                 rect_ = QRect(x - l, y, cursor_width_ + r + l, h);
 209         }
 210
 211         void show(bool set_show = true) { show_ = set_show; }
 212         void hide() { show_ = false; }
 213         int cursorWidth() const { return cursor_width_; }
 214         void recomputeWidth() {
 215                 cursor_width_ = lyxrc.cursor_width
 216                         ? lyxrc.cursor_width
 217                         : 1 + int((lyxrc.zoom + 50) / 200.0);
 218         }
 219
 220         QRect const & rect() { return rect_; }
 221
 222 private:
 223         /// cursor is in RTL or LTR text
 224         bool rtl_;
 225         /// indication for RTL or LTR
 226         bool l_shape_;
 227         /// triangle to show that a completion is available
 228         bool completable_;
 229         ///
 230         bool show_;
 231         ///
 232         QColor color_;
 233         /// rectangle, possibly with l_shape and completion triangle
 234         QRect rect_;
 235         /// x position (were the vertical line is drawn)
 236         int x_;
 237
 238         int cursor_width_;
 239 };
 240
 241
 242 // This is a 'heartbeat' generating synthetic mouse move events when the
 243 // cursor is at the top or bottom edge of the viewport. One scroll per 0.2 s
 244 SyntheticMouseEvent::SyntheticMouseEvent()
 245         : timeout(200), restart_timeout(true)
 246 {}
 247
 248
 249 GuiWorkArea::Private::Private(GuiWorkArea * parent)
 250 : p(parent), screen_(0), buffer_view_(0), read_only_(false), lyx_view_(0),
 251 cursor_visible_(false), cursor_(0),
 252 need_resize_(false), schedule_redraw_(false), preedit_lines_(1),
 253 pixel_ratio_(1.0),
 254 completer_(new GuiCompleter(p, p)), dialog_mode_(false)
 255 {
 256 }
 257
 258
 259 GuiWorkArea::GuiWorkArea(QWidget * /* w */)
 260 : d(new Private(this))
 261 {
 262 }
 263
 264
 265 GuiWorkArea::GuiWorkArea(Buffer & buffer, GuiView & gv)
 266 : d(new Private(this))
 267 {
 268         setGuiView(gv);
 269         buffer.params().display_pixel_ratio = theGuiApp()->pixelRatio();
 270         setBuffer(buffer);
 271         init();
 272 }
 273
 274
 275 double GuiWorkArea::pixelRatio() const
 276 {
 277 #if QT_VERSION >= 0x050000
 278         return devicePixelRatio();
 279 #else
 280         return 1.0;
 281 #endif
 282 }
 283
 284
 285 void GuiWorkArea::init()
 286 {
 287         // Setup the signals
 288         connect(&d->cursor_timeout_, SIGNAL(timeout()),
 289                 this, SLOT(toggleCursor()));
 290
 291         int const time = QApplication::cursorFlashTime() / 2;
 292         if (time > 0) {
 293                 d->cursor_timeout_.setInterval(time);
 294                 d->cursor_timeout_.start();
 295         } else {
 296                 // let's initialize this just to be safe
 297                 d->cursor_timeout_.setInterval(500);
 298         }
 299
 300         d->resetScreen();
 301         // With Qt4.5 a mouse event will happen before the first paint event
 302         // so make sure that the buffer view has an up to date metrics.
 303         d->buffer_view_->resize(viewport()->width(), viewport()->height());
 304         d->cursor_ = new frontend::CursorWidget();
 305         d->cursor_->hide();
 306
 307         setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 308         setAcceptDrops(true);
 309         setMouseTracking(true);
 310         setMinimumSize(100, 70);
 311         setFrameStyle(QFrame::NoFrame);
 312         updateWindowTitle();
 313
 314         viewport()->setAutoFillBackground(false);
 315         // We don't need double-buffering nor SystemBackground on
 316         // the viewport because we have our own backing pixmap.
 317         viewport()->setAttribute(Qt::WA_NoSystemBackground);
 318
 319         setFocusPolicy(Qt::StrongFocus);
 320
 321         d->setCursorShape(Qt::IBeamCursor);
 322
 323         d->synthetic_mouse_event_.timeout.timeout.connect(
 324                 bind(&GuiWorkArea::generateSyntheticMouseEvent,
 325                                         this));
 326
 327         // Initialize the vertical Scroll Bar
 328         QObject::connect(verticalScrollBar(), SIGNAL(valueChanged(int)),
 329                 this, SLOT(scrollTo(int)));
 330
 331         LYXERR(Debug::GUI, "viewport width: " << viewport()->width()
 332                 << "  viewport height: " << viewport()->height());
 333
 334         // Enables input methods for asian languages.
 335         // Must be set when creating custom text editing widgets.
 336         setAttribute(Qt::WA_InputMethodEnabled, true);
 337
 338         d->dialog_mode_ = false;
 339 }
 340
 341
 342 GuiWorkArea::~GuiWorkArea()
 343 {
 344         d->buffer_view_->buffer().workAreaManager().remove(this);
 345         delete d->screen_;
 346         delete d->buffer_view_;
 347         delete d->cursor_;
 348         // Completer has a QObject parent and is thus automatically destroyed.
 349         // See #4758.
 350         // delete completer_;
 351         delete d;
 352 }
 353
 354
 355 Qt::CursorShape GuiWorkArea::cursorShape() const
 356 {
 357         return viewport()->cursor().shape();
 358 }
 359
 360
 361 void GuiWorkArea::Private::setCursorShape(Qt::CursorShape shape)
 362 {
 363         p->viewport()->setCursor(shape);
 364 }
 365
 366
 367 void GuiWorkArea::Private::updateCursorShape()
 368 {
 369         setCursorShape(buffer_view_->clickableInset()
 370                 ? Qt::PointingHandCursor : Qt::IBeamCursor);
 371 }
 372
 373
 374 void GuiWorkArea::setGuiView(GuiView & gv)
 375 {
 376         d->lyx_view_ = &gv;
 377 }
 378
 379
 380 void GuiWorkArea::setBuffer(Buffer & buffer)
 381 {
 382         delete d->buffer_view_;
 383         d->buffer_view_ = new BufferView(buffer);
 384         buffer.workAreaManager().add(this);
 385
 386         // HACK: Prevents an additional redraw when the scrollbar pops up
 387         // which regularily happens on documents with more than one page.
 388         // The policy  should be set to "Qt::ScrollBarAsNeeded" soon.
 389         // Since we have no geometry information yet, we assume that
 390         // a document needs a scrollbar if there is more then four
 391         // paragraph in the outermost text.
 392         if (buffer.text().paragraphs().size() > 4)
 393                 setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
 394         QTimer::singleShot(50, this, SLOT(fixVerticalScrollBar()));
 395         Q_EMIT bufferViewChanged();
 396 }
 397
 398
 399 void GuiWorkArea::fixVerticalScrollBar()
 400 {
 401         if (!isFullScreen())
 402                 setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
 403 }
 404
 405
 406 void GuiWorkArea::close()
 407 {
 408         d->lyx_view_->removeWorkArea(this);
 409 }
 410
 411
 412 void GuiWorkArea::setFullScreen(bool full_screen)
 413 {
 414         d->buffer_view_->setFullScreen(full_screen);
 415         setFrameStyle(QFrame::NoFrame);
 416         if (full_screen) {
 417                 setFrameStyle(QFrame::NoFrame);
 418                 if (lyxrc.full_screen_scrollbar)
 419                         setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 420         } else
 421                 setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
 422 }
 423
 424
 425 BufferView & GuiWorkArea::bufferView()
 426 {
 427         return *d->buffer_view_;
 428 }
 429
 430
 431 BufferView const & GuiWorkArea::bufferView() const
 432 {
 433         return *d->buffer_view_;
 434 }
 435
 436
 437 void GuiWorkArea::stopBlinkingCursor()
 438 {
 439         d->cursor_timeout_.stop();
 440         d->hideCursor();
 441 }
 442
 443
 444 void GuiWorkArea::startBlinkingCursor()
 445 {
 446         // do not show the cursor if the view is busy
 447         if (view().busy())
 448                 return;
 449
 450         Point p;
 451         int h = 0;
 452         d->buffer_view_->cursorPosAndHeight(p, h);
 453         // Don't start blinking if the cursor isn't on screen.
 454         if (!d->buffer_view_->cursorInView(p, h))
 455                 return;
 456
 457         d->showCursor();
 458
 459         //we're not supposed to cache this value.
 460         int const time = QApplication::cursorFlashTime() / 2;
 461         if (time <= 0)
 462                 return;
 463         d->cursor_timeout_.setInterval(time);
 464         d->cursor_timeout_.start();
 465 }
 466
 467
 468 void GuiWorkArea::redraw(bool update_metrics)
 469 {
 470         if (!isVisible())
 471                 // No need to redraw in this case.
 472                 return;
 473
 474         // No need to do anything if this is the current view. The BufferView
 475         // metrics are already up to date.
 476         if (update_metrics || d->lyx_view_ != guiApp->currentView()
 477                 || d->lyx_view_->currentWorkArea() != this) {
 478                 // FIXME: it would be nice to optimize for the off-screen case.
 479                 d->buffer_view_->cursor().fixIfBroken();
 480                 d->buffer_view_->updateMetrics();
 481                 d->buffer_view_->cursor().fixIfBroken();
 482         }
 483
 484         // update cursor position, because otherwise it has to wait until
 485         // the blinking interval is over
 486         if (d->cursor_visible_) {
 487                 d->hideCursor();
 488                 d->showCursor();
 489         }
 490
 491         LYXERR(Debug::WORKAREA, "WorkArea::redraw screen");
 492         d->updateScreen();
 493         update(0, 0, viewport()->width(), viewport()->height());
 494
 495         /// \warning: scrollbar updating *must* be done after the BufferView is drawn
 496         /// because \c BufferView::updateScrollbar() is called in \c BufferView::draw().
 497         d->updateScrollbar();
 498         d->lyx_view_->updateStatusBar();
 499
 500         if (lyxerr.debugging(Debug::WORKAREA))
 501                 d->buffer_view_->coordCache().dump();
 502
 503         updateWindowTitle();
 504
 505         d->updateCursorShape();
 506 }
 507
 508
 509 // Keep in sync with GuiWorkArea::processKeySym below
 510 bool GuiWorkArea::queryKeySym(KeySymbol const & key, KeyModifier mod) const
 511 {
 512         return guiApp->queryKeySym(key, mod);
 513 }
 514
 515
 516 // Keep in sync with GuiWorkArea::queryKeySym above
 517 void GuiWorkArea::processKeySym(KeySymbol const & key, KeyModifier mod)
 518 {
 519         if (d->lyx_view_->isFullScreen() && d->lyx_view_->menuBar()->isVisible()
 520                 && lyxrc.full_screen_menubar) {
 521                 // FIXME HACK: we should not have to do this here. See related comment
 522                 // in GuiView::event() (QEvent::ShortcutOverride)
 523                 d->lyx_view_->menuBar()->hide();
 524         }
 525
 526         // In order to avoid bad surprise in the middle of an operation,
 527         // we better stop the blinking cursor...
 528         // the cursor gets restarted in GuiView::restartCursor()
 529         stopBlinkingCursor();
 530         guiApp->processKeySym(key, mod);
 531 }
 532
 533
 534 void GuiWorkArea::Private::dispatch(FuncRequest const & cmd)
 535 {
 536         // Handle drag&drop
 537         if (cmd.action() == LFUN_FILE_OPEN) {
 538                 DispatchResult dr;
 539                 lyx_view_->dispatch(cmd, dr);
 540                 return;
 541         }
 542
 543         bool const notJustMovingTheMouse =
 544                 cmd.action() != LFUN_MOUSE_MOTION || cmd.button() != mouse_button::none;
 545
 546         // In order to avoid bad surprise in the middle of an operation, we better stop
 547         // the blinking cursor.
 548         if (notJustMovingTheMouse)
 549                 p->stopBlinkingCursor();
 550
 551         buffer_view_->mouseEventDispatch(cmd);
 552
 553         // Skip these when selecting
 554         // FIXME: let GuiView take care of those.
 555         if (cmd.action() != LFUN_MOUSE_MOTION) {
 556                 completer_->updateVisibility(false, false);
 557                 lyx_view_->updateDialogs();
 558                 lyx_view_->updateStatusBar();
 559         }
 560
 561         // GUI tweaks except with mouse motion with no button pressed.
 562         if (notJustMovingTheMouse) {
 563                 // Slight hack: this is only called currently when we
 564                 // clicked somewhere, so we force through the display
 565                 // of the new status here.
 566                 // FIXME: let GuiView take care of those.
 567                 lyx_view_->clearMessage();
 568
 569                 // Show the cursor immediately after any operation
 570                 p->startBlinkingCursor();
 571         }
 572
 573         updateCursorShape();
 574 }
 575
 576
 577 void GuiWorkArea::Private::resizeBufferView()
 578 {
 579         // WARNING: Please don't put any code that will trigger a repaint here!
 580         // We are already inside a paint event.
 581         p->stopBlinkingCursor();
 582         // Warn our container (GuiView).
 583         p->busy(true);
 584
 585         Point point;
 586         int h = 0;
 587         buffer_view_->cursorPosAndHeight(point, h);
 588         bool const cursor_in_view = buffer_view_->cursorInView(point, h);
 589         buffer_view_->resize(p->viewport()->width(), p->viewport()->height());
 590         if (cursor_in_view)
 591                 buffer_view_->scrollToCursor();
 592         updateScreen();
 593
 594         // Update scrollbars which might have changed due different
 595         // BufferView dimension. This is especially important when the
 596         // BufferView goes from zero-size to the real-size for the first time,
 597         // as the scrollbar paramters are then set for the first time.
 598         updateScrollbar();
 599
 600         need_resize_ = false;
 601         p->busy(false);
 602         // Eventually, restart the cursor after the resize event.
 603         // We might be resizing even if the focus is on another widget so we only
 604         // restart the cursor if we have the focus.
 605         if (p->hasFocus())
 606                 QTimer::singleShot(50, p, SLOT(startBlinkingCursor()));
 607 }
 608
 609
 610 void GuiWorkArea::Private::showCursor()
 611 {
 612         if (cursor_visible_)
 613                 return;
 614
 615         Point p;
 616         int h = 0;
 617         buffer_view_->cursorPosAndHeight(p, h);
 618         if (!buffer_view_->cursorInView(p, h))
 619                 return;
 620
 621         // RTL or not RTL
 622         bool l_shape = false;
 623         Font const & realfont = buffer_view_->cursor().real_current_font;
 624         BufferParams const & bp = buffer_view_->buffer().params();
 625         bool const samelang = realfont.language() == bp.language;
 626         bool const isrtl = realfont.isVisibleRightToLeft();
 627
 628         if (!samelang || isrtl != bp.language->rightToLeft())
 629                 l_shape = true;
 630
 631         // The ERT language hack needs fixing up
 632         if (realfont.language() == latex_language)
 633                 l_shape = false;
 634
 635         // show cursor on screen
 636         Cursor & cur = buffer_view_->cursor();
 637         bool completable = cur.inset().showCompletionCursor()
 638                 && completer_->completionAvailable()
 639                 && !completer_->popupVisible()
 640                 && !completer_->inlineVisible();
 641         cursor_visible_ = true;
 642         cursor_->recomputeWidth();
 643
 644         //int cur_x = buffer_view_->getPos(cur).x_;
 645         // We may have decided to slide the cursor row so that cursor
 646         // is visible.
 647         p.x_ -= buffer_view_->horizScrollOffset();
 648
 649         showCursor(p.x_, p.y_, h, l_shape, isrtl, completable);
 650 }
 651
 652
 653 void GuiWorkArea::Private::hideCursor()
 654 {
 655         if (!cursor_visible_)
 656                 return;
 657
 658         cursor_visible_ = false;
 659         removeCursor();
 660 }
 661
 662
 663 void GuiWorkArea::toggleCursor()
 664 {
 665         if (d->cursor_visible_)
 666                 d->hideCursor();
 667         else
 668                 d->showCursor();
 669 }
 670
 671
 672 void GuiWorkArea::Private::updateScrollbar()
 673 {
 674         ScrollbarParameters const & scroll_ = buffer_view_->scrollbarParameters();
 675         // Block signals to prevent setRange() and setSliderPosition from causing
 676         // recursive calls via the signal valueChanged. (#10311)
 677         QSignalBlocker blocker(p->verticalScrollBar());
 678         p->verticalScrollBar()->setRange(scroll_.min, scroll_.max);
 679         p->verticalScrollBar()->setPageStep(scroll_.page_step);
 680         p->verticalScrollBar()->setSingleStep(scroll_.single_step);
 681         p->verticalScrollBar()->setSliderPosition(0);
 682 }
 683
 684
 685 void GuiWorkArea::scrollTo(int value)
 686 {
 687         stopBlinkingCursor();
 688         d->buffer_view_->scrollDocView(value, true);
 689
 690         if (lyxrc.cursor_follows_scrollbar) {
 691                 d->buffer_view_->setCursorFromScrollbar();
 692                 // FIXME: let GuiView take care of those.
 693                 d->lyx_view_->updateLayoutList();
 694         }
 695         // Show the cursor immediately after any operation.
 696         startBlinkingCursor();
 697         // FIXME QT5
 698 #ifdef Q_WS_X11
 699         QApplication::syncX();
 700 #endif
 701 }
 702
 703
 704 bool GuiWorkArea::event(QEvent * e)
 705 {
 706         switch (e->type()) {
 707         case QEvent::ToolTip: {
 708                 QHelpEvent * helpEvent = static_cast<QHelpEvent *>(e);
 709                 if (lyxrc.use_tooltip) {
 710                         QPoint pos = helpEvent->pos();
 711                         if (pos.x() < viewport()->width()) {
 712                                 QString s = toqstr(d->buffer_view_->toolTip(pos.x(), pos.y()));
 713                                 QToolTip::showText(helpEvent->globalPos(), formatToolTip(s,35));
 714                         }
 715                         else
 716                                 QToolTip::hideText();
 717                 }
 718                 // Don't forget to accept the event!
 719                 e->accept();
 720                 return true;
 721         }
 722
 723         case QEvent::ShortcutOverride:
 724                 // keyPressEvent is ShortcutOverride-aware and only accepts the event in
 725                 // this case
 726                 keyPressEvent(static_cast<QKeyEvent *>(e));
 727                 return e->isAccepted();
 728
 729         case QEvent::KeyPress: {
 730                 // We catch this event in order to catch the Tab or Shift+Tab key press
 731                 // which are otherwise reserved to focus switching between controls
 732                 // within a dialog.
 733                 QKeyEvent * ke = static_cast<QKeyEvent*>(e);
 734                 if ((ke->key() == Qt::Key_Tab && ke->modifiers() == Qt::NoModifier)
 735                         || (ke->key() == Qt::Key_Backtab && (
 736                                 ke->modifiers() == Qt::ShiftModifier
 737                                 || ke->modifiers() == Qt::NoModifier))) {
 738                         keyPressEvent(ke);
 739                         return true;
 740                 }
 741                 return QAbstractScrollArea::event(e);
 742         }
 743
 744         default:
 745                 return QAbstractScrollArea::event(e);
 746         }
 747         return false;
 748 }
 749
 750
 751 void GuiWorkArea::contextMenuEvent(QContextMenuEvent * e)
 752 {
 753         string name;
 754         if (e->reason() == QContextMenuEvent::Mouse)
 755                 // the menu name is set on mouse press
 756                 name = d->context_menu_name_;
 757         else {
 758                 QPoint pos = e->pos();
 759                 Cursor const & cur = d->buffer_view_->cursor();
 760                 if (e->reason() == QContextMenuEvent::Keyboard && cur.inTexted()) {
 761                         // Do not access the context menu of math right in front of before
 762                         // the cursor. This does not work when the cursor is in text.
 763                         Inset * inset = cur.paragraph().getInset(cur.pos());
 764                         if (inset && inset->asInsetMath())
 765                                 --pos.rx();
 766                         else if (cur.pos() > 0) {
 767                                 Inset * inset = cur.paragraph().getInset(cur.pos() - 1);
 768                                 if (inset)
 769                                         ++pos.rx();
 770                         }
 771                 }
 772                 name = d->buffer_view_->contextMenu(pos.x(), pos.y());
 773         }
 774
 775         if (name.empty()) {
 776                 QAbstractScrollArea::contextMenuEvent(e);
 777                 return;
 778         }
 779         // always show mnemonics when the keyboard is used to show the context menu
 780         // FIXME: This should be fixed in Qt itself
 781         bool const keyboard = (e->reason() == QContextMenuEvent::Keyboard);
 782         QMenu * menu = guiApp->menus().menu(toqstr(name), *d->lyx_view_, keyboard);
 783         if (!menu) {
 784                 QAbstractScrollArea::contextMenuEvent(e);
 785                 return;
 786         }
 787         // Position the menu to the right.
 788         // FIXME: menu position should be different for RTL text.
 789         menu->exec(e->globalPos());
 790         e->accept();
 791 }
 792
 793
 794 void GuiWorkArea::focusInEvent(QFocusEvent * e)
 795 {
 796         LYXERR(Debug::DEBUG, "GuiWorkArea::focusInEvent(): " << this << endl);
 797         if (d->lyx_view_->currentWorkArea() != this) {
 798                 d->lyx_view_->setCurrentWorkArea(this);
 799                 d->lyx_view_->currentWorkArea()->bufferView().buffer().updateBuffer();
 800         }
 801
 802         startBlinkingCursor();
 803         QAbstractScrollArea::focusInEvent(e);
 804 }
 805
 806
 807 void GuiWorkArea::focusOutEvent(QFocusEvent * e)
 808 {
 809         LYXERR(Debug::DEBUG, "GuiWorkArea::focusOutEvent(): " << this << endl);
 810         stopBlinkingCursor();
 811         QAbstractScrollArea::focusOutEvent(e);
 812 }
 813
 814
 815 void GuiWorkArea::mousePressEvent(QMouseEvent * e)
 816 {
 817         if (d->dc_event_.active && d->dc_event_ == *e) {
 818                 d->dc_event_.active = false;
 819                 FuncRequest cmd(LFUN_MOUSE_TRIPLE, e->x(), e->y(),
 820                         q_button_state(e->button()), q_key_state(e->modifiers()));
 821                 d->dispatch(cmd);
 822                 e->accept();
 823                 return;
 824         }
 825
 826 #if (QT_VERSION < 0x050000) && !defined(__HAIKU__)
 827         inputContext()->reset();
 828 #endif
 829
 830         FuncRequest const cmd(LFUN_MOUSE_PRESS, e->x(), e->y(),
 831                         q_button_state(e->button()), q_key_state(e->modifiers()));
 832         d->dispatch(cmd);
 833
 834         // Save the context menu on mouse press, because also the mouse
 835         // cursor is set on mouse press. Afterwards, we can either release
 836         // the mousebutton somewhere else, or the cursor might have moved
 837         // due to the DEPM. We need to do this after the mouse has been
 838         // set in dispatch(), because the selection state might change.
 839         if (e->button() == Qt::RightButton)
 840                 d->context_menu_name_ = d->buffer_view_->contextMenu(e->x(), e->y());
 841
 842         e->accept();
 843 }
 844
 845
 846 void GuiWorkArea::mouseReleaseEvent(QMouseEvent * e)
 847 {
 848         if (d->synthetic_mouse_event_.timeout.running())
 849                 d->synthetic_mouse_event_.timeout.stop();
 850
 851         FuncRequest const cmd(LFUN_MOUSE_RELEASE, e->x(), e->y(),
 852                         q_button_state(e->button()), q_key_state(e->modifiers()));
 853         d->dispatch(cmd);
 854         e->accept();
 855 }
 856
 857
 858 void GuiWorkArea::mouseMoveEvent(QMouseEvent * e)
 859 {
 860         // we kill the triple click if we move
 861         doubleClickTimeout();
 862         FuncRequest cmd(LFUN_MOUSE_MOTION, e->x(), e->y(),
 863                         q_motion_state(e->buttons()), q_key_state(e->modifiers()));
 864
 865         e->accept();
 866
 867         // If we're above or below the work area...
 868         if ((e->y() <= 20 || e->y() >= viewport()->height() - 20)
 869                         && e->buttons() == mouse_button::button1) {
 870                 // Make sure only a synthetic event can cause a page scroll,
 871                 // so they come at a steady rate:
 872                 if (e->y() <= 20)
 873                         // _Force_ a scroll up:
 874                         cmd.set_y(e->y() - 21);
 875                 else
 876                         cmd.set_y(e->y() + 21);
 877                 // Store the event, to be handled when the timeout expires.
 878                 d->synthetic_mouse_event_.cmd = cmd;
 879
 880                 if (d->synthetic_mouse_event_.timeout.running()) {
 881                         // Discard the event. Note that it _may_ be handled
 882                         // when the timeout expires if
 883                         // synthetic_mouse_event_.cmd has not been overwritten.
 884                         // Ie, when the timeout expires, we handle the
 885                         // most recent event but discard all others that
 886                         // occurred after the one used to start the timeout
 887                         // in the first place.
 888                         return;
 889                 }
 890
 891                 d->synthetic_mouse_event_.restart_timeout = true;
 892                 d->synthetic_mouse_event_.timeout.start();
 893                 // Fall through to handle this event...
 894
 895         } else if (d->synthetic_mouse_event_.timeout.running()) {
 896                 // Store the event, to be possibly handled when the timeout
 897                 // expires.
 898                 // Once the timeout has expired, normal control is returned
 899                 // to mouseMoveEvent (restart_timeout = false).
 900                 // This results in a much smoother 'feel' when moving the
 901                 // mouse back into the work area.
 902                 d->synthetic_mouse_event_.cmd = cmd;
 903                 d->synthetic_mouse_event_.restart_timeout = false;
 904                 return;
 905         }
 906         d->dispatch(cmd);
 907 }
 908
 909
 910 void GuiWorkArea::wheelEvent(QWheelEvent * ev)
 911 {
 912         // Wheel rotation by one notch results in a delta() of 120 (see
 913         // documentation of QWheelEvent)
 914         double const delta = ev->delta() / 120.0;
 915         bool zoom = false;
 916         switch (lyxrc.scroll_wheel_zoom) {
 917         case LyXRC::SCROLL_WHEEL_ZOOM_CTRL:
 918                 zoom = ev->modifiers() & Qt::ControlModifier;
 919                 zoom &= !(ev->modifiers() & (Qt::ShiftModifier | Qt::AltModifier));
 920                 break;
 921         case LyXRC::SCROLL_WHEEL_ZOOM_SHIFT:
 922                 zoom = ev->modifiers() & Qt::ShiftModifier;
 923                 zoom &= !(ev->modifiers() & (Qt::ControlModifier | Qt::AltModifier));
 924                 break;
 925         case LyXRC::SCROLL_WHEEL_ZOOM_ALT:
 926                 zoom = ev->modifiers() & Qt::AltModifier;
 927                 zoom &= !(ev->modifiers() & (Qt::ShiftModifier | Qt::ControlModifier));
 928                 break;
 929         case LyXRC::SCROLL_WHEEL_ZOOM_OFF:
 930                 break;
 931         }
 932         if (zoom) {
 933                 docstring arg = convert<docstring>(int(5 * delta));
 934                 lyx::dispatch(FuncRequest(LFUN_BUFFER_ZOOM_IN, arg));
 935                 return;
 936         }
 937
 938         // Take into account the desktop wide settings.
 939         int const lines = qApp->wheelScrollLines();
 940         int const page_step = verticalScrollBar()->pageStep();
 941         // Test if the wheel mouse is set to one screen at a time.
 942         // This is according to
 943         // https://doc.qt.io/qt-5/qapplication.html#wheelScrollLines-prop
 944         int scroll_value =
 945                 min(lines * verticalScrollBar()->singleStep(), page_step);
 946
 947         // Take into account the rotation and the user preferences.
 948         scroll_value = int(scroll_value * delta * lyxrc.mouse_wheel_speed);
 949         LYXERR(Debug::SCROLLING, "wheelScrollLines = " << lines
 950                         << " delta = " << delta << " scroll_value = " << scroll_value
 951                         << " page_step = " << page_step);
 952         // Now scroll.
 953         verticalScrollBar()->setValue(verticalScrollBar()->value() - scroll_value);
 954
 955         ev->accept();
 956 }
 957
 958
 959 void GuiWorkArea::generateSyntheticMouseEvent()
 960 {
 961         int const e_y = d->synthetic_mouse_event_.cmd.y();
 962         int const wh = d->buffer_view_->workHeight();
 963         bool const up = e_y < 0;
 964         bool const down = e_y > wh;
 965
 966         // Set things off to generate the _next_ 'pseudo' event.
 967         int step = 50;
 968         if (d->synthetic_mouse_event_.restart_timeout) {
 969                 // This is some magic formulae to determine the speed
 970                 // of scrolling related to the position of the mouse.
 971                 int time = 200;
 972                 if (up || down) {
 973                         int dist = up ? -e_y : e_y - wh;
 974                         time = max(min(200, 250000 / (dist * dist)), 1) ;
 975
 976                         if (time < 40) {
 977                                 step = 80000 / (time * time);
 978                                 time = 40;
 979                         }
 980                 }
 981                 d->synthetic_mouse_event_.timeout.setTimeout(time);
 982                 d->synthetic_mouse_event_.timeout.start();
 983         }
 984
 985         // Can we scroll further ?
 986         int const value = verticalScrollBar()->value();
 987         if (value == verticalScrollBar()->maximum()
 988                   || value == verticalScrollBar()->minimum()) {
 989                 d->synthetic_mouse_event_.timeout.stop();
 990                 return;
 991         }
 992
 993         // Scroll
 994         if (step <= 2 * wh) {
 995                 d->buffer_view_->scroll(up ? -step : step);
 996                 d->buffer_view_->updateMetrics();
 997         } else {
 998                 d->buffer_view_->scrollDocView(value + (up ? -step : step), false);
 999         }
1000
1001         // In which paragraph do we have to set the cursor ?
1002         Cursor & cur = d->buffer_view_->cursor();
1003         // FIXME: we don't know howto handle math.
1004         Text * text = cur.text();
1005         if (!text)
1006                 return;
1007         TextMetrics const & tm = d->buffer_view_->textMetrics(text);
1008
1009         pair<pit_type, const ParagraphMetrics *> pp = up ? tm.first() : tm.last();
1010         ParagraphMetrics const & pm = *pp.second;
1011         pit_type const pit = pp.first;
1012
1013         if (pm.rows().empty())
1014                 return;
1015
1016         // Find the row at which we set the cursor.
1017         RowList::const_iterator rit = pm.rows().begin();
1018         RowList::const_iterator rlast = pm.rows().end();
1019         int yy = pm.position() - pm.ascent();
1020         for (--rlast; rit != rlast; ++rit) {
1021                 int h = rit->height();
1022                 if ((up && yy + h > 0)
1023                           || (!up && yy + h > wh - defaultRowHeight()))
1024                         break;
1025                 yy += h;
1026         }
1027
1028         // Find the position of the cursor
1029         bool bound;
1030         int x = d->synthetic_mouse_event_.cmd.x();
1031         pos_type const pos = tm.getPosNearX(*rit, x, bound);
1032
1033         // Set the cursor
1034         cur.pit() = pit;
1035         cur.pos() = pos;
1036         cur.boundary(bound);
1037
1038         d->buffer_view_->buffer().changed(false);
1039         return;
1040 }
1041
1042
1043 void GuiWorkArea::keyPressEvent(QKeyEvent * ev)
1044 {
1045         // this is also called for ShortcutOverride events. In this case, one must
1046         // not act but simply accept the event explicitly.
1047         bool const act = (ev->type() != QEvent::ShortcutOverride);
1048
1049         // Do not process here some keys if dialog_mode_ is set
1050         if (d->dialog_mode_
1051                 && (ev->modifiers() == Qt::NoModifier
1052                     || ev->modifiers() == Qt::ShiftModifier)
1053                 && (ev->key() == Qt::Key_Escape
1054                     || ev->key() == Qt::Key_Enter
1055                     || ev->key() == Qt::Key_Return)
1056             ) {
1057                 ev->ignore();
1058                 return;
1059         }
1060
1061         // intercept some keys if completion popup is visible
1062         if (d->completer_->popupVisible()) {
1063                 switch (ev->key()) {
1064                 case Qt::Key_Enter:
1065                 case Qt::Key_Return:
1066                         if (act)
1067                                 d->completer_->activate();
1068                         ev->accept();
1069                         return;
1070                 }
1071         }
1072
1073         // do nothing if there are other events
1074         // (the auto repeated events come too fast)
1075         // it looks like this is only needed on X11
1076 #if defined(Q_WS_X11) || defined(QPA_XCB)
1077         // FIXME: this is a weird way to implement event compression. Also, this is
1078         // broken with IBus.
1079         if (act && qApp->hasPendingEvents() && ev->isAutoRepeat()) {
1080                 switch (ev->key()) {
1081                 case Qt::Key_PageDown:
1082                 case Qt::Key_PageUp:
1083                 case Qt::Key_Left:
1084                 case Qt::Key_Right:
1085                 case Qt::Key_Up:
1086                 case Qt::Key_Down:
1087                         LYXERR(Debug::KEY, "system is busy: scroll key event ignored");
1088                         ev->ignore();
1089                         return;
1090                 }
1091         }
1092 #endif
1093
1094         KeyModifier const m = q_key_state(ev->modifiers());
1095
1096         std::string str;
1097         if (m & ShiftModifier)
1098                 str += "Shift-";
1099         if (m & ControlModifier)
1100                 str += "Control-";
1101         if (m & AltModifier)
1102                 str += "Alt-";
1103         if (m & MetaModifier)
1104                 str += "Meta-";
1105
1106         if (act)
1107                 LYXERR(Debug::KEY, " count: " << ev->count() << " text: " << ev->text()
1108                        << " isAutoRepeat: " << ev->isAutoRepeat() << " key: " << ev->key()
1109                        << " keyState: " << str);
1110
1111         KeySymbol sym;
1112         setKeySymbol(&sym, ev);
1113         if (sym.isOK()) {
1114                 if (act) {
1115                         processKeySym(sym, m);
1116                         ev->accept();
1117                 } else
1118                         ev->setAccepted(queryKeySym(sym, m));
1119         } else {
1120                 ev->ignore();
1121         }
1122 }
1123
1124
1125 void GuiWorkArea::doubleClickTimeout()
1126 {
1127         d->dc_event_.active = false;
1128 }
1129
1130
1131 void GuiWorkArea::mouseDoubleClickEvent(QMouseEvent * ev)
1132 {
1133         d->dc_event_ = DoubleClick(ev);
1134         QTimer::singleShot(QApplication::doubleClickInterval(), this,
1135                         SLOT(doubleClickTimeout()));
1136         FuncRequest cmd(LFUN_MOUSE_DOUBLE, ev->x(), ev->y(),
1137                         q_button_state(ev->button()), q_key_state(ev->modifiers()));
1138         d->dispatch(cmd);
1139         ev->accept();
1140 }
1141
1142
1143 void GuiWorkArea::resizeEvent(QResizeEvent * ev)
1144 {
1145         QAbstractScrollArea::resizeEvent(ev);
1146         d->need_resize_ = true;
1147         ev->accept();
1148 }
1149
1150
1151 void GuiWorkArea::Private::update(int x, int y, int w, int h)
1152 {
1153         p->viewport()->update(x, y, w, h);
1154 }
1155
1156
1157 void GuiWorkArea::paintEvent(QPaintEvent * ev)
1158 {
1159         QRectF const rc = ev->rect();
1160         // LYXERR(Debug::PAINTING, "paintEvent begin: x: " << rc.x()
1161         //      << " y: " << rc.y() << " w: " << rc.width() << " h: " << rc.height());
1162
1163         if (d->needResize()) {
1164                 d->resetScreen();
1165                 d->resizeBufferView();
1166                 if (d->cursor_visible_) {
1167                         d->hideCursor();
1168                         d->showCursor();
1169                 }
1170         }
1171
1172         QPainter pain(viewport());
1173         double const pr = pixelRatio();
1174         QRectF const rcs = QRectF(rc.x() * pr, rc.y() * pr, rc.width() * pr, rc.height() * pr);
1175
1176         if (lyxrc.use_qimage) {
1177                 QImage const & image = static_cast<QImage const &>(*d->screen_);
1178                 pain.drawImage(rc, image, rcs);
1179         } else {
1180                 QPixmap const & pixmap = static_cast<QPixmap const &>(*d->screen_);
1181                 pain.drawPixmap(rc, pixmap, rcs);
1182         }
1183         d->cursor_->draw(pain);
1184         ev->accept();
1185 }
1186
1187
1188 void GuiWorkArea::Private::updateScreen()
1189 {
1190         GuiPainter pain(screen_, p->pixelRatio());
1191         buffer_view_->draw(pain);
1192 }
1193
1194
1195 void GuiWorkArea::Private::showCursor(int x, int y, int h,
1196         bool l_shape, bool rtl, bool completable)
1197 {
1198         if (schedule_redraw_) {
1199                 // This happens when a graphic conversion is finished. As we don't know
1200                 // the size of the new graphics, it's better the update everything.
1201                 // We can't use redraw() here because this would trigger a infinite
1202                 // recursive loop with showCursor().
1203                 buffer_view_->resize(p->viewport()->width(), p->viewport()->height());
1204                 updateScreen();
1205                 updateScrollbar();
1206                 p->viewport()->update(QRect(0, 0, p->viewport()->width(), p->viewport()->height()));
1207                 schedule_redraw_ = false;
1208                 // Show the cursor immediately after the update.
1209                 hideCursor();
1210                 p->toggleCursor();
1211                 return;
1212         }
1213
1214         cursor_->update(x, y, h, l_shape, rtl, completable);
1215         cursor_->show();
1216         p->viewport()->update(cursor_->rect());
1217 }
1218
1219
1220 void GuiWorkArea::Private::removeCursor()
1221 {
1222         cursor_->hide();
1223         //if (!qApp->focusWidget())
1224                 p->viewport()->update(cursor_->rect());
1225 }
1226
1227
1228 void GuiWorkArea::inputMethodEvent(QInputMethodEvent * e)
1229 {
1230         QString const & commit_string = e->commitString();
1231         docstring const & preedit_string
1232                 = qstring_to_ucs4(e->preeditString());
1233
1234         if (!commit_string.isEmpty()) {
1235
1236                 LYXERR(Debug::KEY, "preeditString: " << e->preeditString()
1237                         << " commitString: " << e->commitString());
1238
1239                 int key = 0;
1240
1241                 // FIXME Iwami 04/01/07: we should take care also of UTF16 surrogates here.
1242                 for (int i = 0; i != commit_string.size(); ++i) {
1243                         QKeyEvent ev(QEvent::KeyPress, key, Qt::NoModifier, commit_string[i]);
1244                         keyPressEvent(&ev);
1245                 }
1246         }
1247
1248         // Hide the cursor during the kana-kanji transformation.
1249         if (preedit_string.empty())
1250                 startBlinkingCursor();
1251         else
1252                 stopBlinkingCursor();
1253
1254         // last_width : for checking if last preedit string was/wasn't empty.
1255         // FIXME THREAD && FIXME
1256         // We could have more than one work area, right?
1257         static bool last_width = false;
1258         if (!last_width && preedit_string.empty()) {
1259                 // if last_width is last length of preedit string.
1260                 e->accept();
1261                 return;
1262         }
1263
1264         GuiPainter pain(d->screen_, pixelRatio());
1265         d->buffer_view_->updateMetrics();
1266         d->buffer_view_->draw(pain);
1267         FontInfo font = d->buffer_view_->cursor().getFont().fontInfo();
1268         FontMetrics const & fm = theFontMetrics(font);
1269         int height = fm.maxHeight();
1270         int cur_x = d->cursor_->rect().left();
1271         int cur_y = d->cursor_->rect().bottom();
1272
1273         // redraw area of preedit string.
1274         update(0, cur_y - height, viewport()->width(),
1275                 (height + 1) * d->preedit_lines_);
1276
1277         if (preedit_string.empty()) {
1278                 last_width = false;
1279                 d->preedit_lines_ = 1;
1280                 e->accept();
1281                 return;
1282         }
1283         last_width = true;
1284
1285         // att : stores an IM attribute.
1286         QList<QInputMethodEvent::Attribute> const & att = e->attributes();
1287
1288         // get attributes of input method cursor.
1289         // cursor_pos : cursor position in preedit string.
1290         size_t cursor_pos = 0;
1291         bool cursor_is_visible = false;
1292         for (int i = 0; i != att.size(); ++i) {
1293                 if (att.at(i).type == QInputMethodEvent::Cursor) {
1294                         cursor_pos = att.at(i).start;
1295                         cursor_is_visible = att.at(i).length != 0;
1296                         break;
1297                 }
1298         }
1299
1300         size_t preedit_length = preedit_string.length();
1301
1302         // get position of selection in input method.
1303         // FIXME: isn't there a way to do this simplier?
1304         // rStart : cursor position in selected string in IM.
1305         size_t rStart = 0;
1306         // rLength : selected string length in IM.
1307         size_t rLength = 0;
1308         if (cursor_pos < preedit_length) {
1309                 for (int i = 0; i != att.size(); ++i) {
1310                         if (att.at(i).type == QInputMethodEvent::TextFormat) {
1311                                 if (att.at(i).start <= int(cursor_pos)
1312                                         && int(cursor_pos) < att.at(i).start + att.at(i).length) {
1313                                                 rStart = att.at(i).start;
1314                                                 rLength = att.at(i).length;
1315                                                 if (!cursor_is_visible)
1316                                                         cursor_pos += rLength;
1317                                                 break;
1318                                 }
1319                         }
1320                 }
1321         }
1322         else {
1323                 rStart = cursor_pos;
1324                 rLength = 0;
1325         }
1326
1327         int const right_margin = d->buffer_view_->rightMargin();
1328         Painter::preedit_style ps;
1329         // Most often there would be only one line:
1330         d->preedit_lines_ = 1;
1331         for (size_t pos = 0; pos != preedit_length; ++pos) {
1332                 char_type const typed_char = preedit_string[pos];
1333                 // reset preedit string style
1334                 ps = Painter::preedit_default;
1335
1336                 // if we reached the right extremity of the screen, go to next line.
1337                 if (cur_x + fm.width(typed_char) > viewport()->width() - right_margin) {
1338                         cur_x = right_margin;
1339                         cur_y += height + 1;
1340                         ++d->preedit_lines_;
1341                 }
1342                 // preedit strings are displayed with dashed underline
1343                 // and partial strings are displayed white on black indicating
1344                 // that we are in selecting mode in the input method.
1345                 // FIXME: rLength == preedit_length is not a changing condition
1346                 // FIXME: should be put out of the loop.
1347                 if (pos >= rStart
1348                         && pos < rStart + rLength
1349                         && !(cursor_pos < rLength && rLength == preedit_length))
1350                         ps = Painter::preedit_selecting;
1351
1352                 if (pos == cursor_pos
1353                         && (cursor_pos < rLength && rLength == preedit_length))
1354                         ps = Painter::preedit_cursor;
1355
1356                 // draw one character and update cur_x.
1357                 cur_x += pain.preeditText(cur_x, cur_y, typed_char, font, ps);
1358         }
1359
1360         // update the preedit string screen area.
1361         update(0, cur_y - d->preedit_lines_*height, viewport()->width(),
1362                 (height + 1) * d->preedit_lines_);
1363
1364         // Don't forget to accept the event!
1365         e->accept();
1366 }
1367
1368
1369 QVariant GuiWorkArea::inputMethodQuery(Qt::InputMethodQuery query) const
1370 {
1371         QRect cur_r(0, 0, 0, 0);
1372         switch (query) {
1373                 // this is the CJK-specific composition window position and
1374                 // the context menu position when the menu key is pressed.
1375                 case Qt::ImMicroFocus:
1376                         cur_r = d->cursor_->rect();
1377                         if (d->preedit_lines_ != 1)
1378                                 cur_r.moveLeft(10);
1379                         cur_r.moveBottom(cur_r.bottom()
1380                                 + cur_r.height() * (d->preedit_lines_ - 1));
1381                         // return lower right of cursor in LyX.
1382                         return cur_r;
1383                 default:
1384                         return QWidget::inputMethodQuery(query);
1385         }
1386 }
1387
1388
1389 void GuiWorkArea::updateWindowTitle()
1390 {
1391         d->lyx_view_->updateWindowTitle(this);
1392         titleChanged(this);
1393 }
1394
1395
1396 bool GuiWorkArea::isFullScreen() const
1397 {
1398         return d->lyx_view_ && d->lyx_view_->isFullScreen();
1399 }
1400
1401
1402 void GuiWorkArea::scheduleRedraw()
1403 {
1404         d->schedule_redraw_ = true;
1405 }
1406
1407
1408 bool GuiWorkArea::inDialogMode() const
1409 {
1410         return d->dialog_mode_;
1411 }
1412
1413
1414 void GuiWorkArea::setDialogMode(bool mode)
1415 {
1416         d->dialog_mode_ = mode;
1417 }
1418
1419
1420 GuiCompleter & GuiWorkArea::completer()
1421 {
1422         return *d->completer_;
1423 }
1424
1425 GuiView const & GuiWorkArea::view() const
1426 {
1427         return *d->lyx_view_;
1428 }
1429
1430
1431 GuiView & GuiWorkArea::view()
1432 {
1433         return *d->lyx_view_;
1434 }
1435
1436 ////////////////////////////////////////////////////////////////////
1437 //
1438 // EmbeddedWorkArea
1439 //
1440 ////////////////////////////////////////////////////////////////////
1441
1442
1443 EmbeddedWorkArea::EmbeddedWorkArea(QWidget * w): GuiWorkArea(w)
1444 {
1445         support::TempFile tempfile("embedded.internal");
1446         tempfile.setAutoRemove(false);
1447         buffer_ = theBufferList().newInternalBuffer(tempfile.name().absFileName());
1448         buffer_->setUnnamed(true);
1449         buffer_->setFullyLoaded(true);
1450         setBuffer(*buffer_);
1451         setDialogMode(true);
1452 }
1453
1454
1455 EmbeddedWorkArea::~EmbeddedWorkArea()
1456 {
1457         // No need to destroy buffer and bufferview here, because it is done
1458         // in theBufferList() destruction loop at application exit
1459 }
1460
1461
1462 void EmbeddedWorkArea::closeEvent(QCloseEvent * ev)
1463 {
1464         disable();
1465         GuiWorkArea::closeEvent(ev);
1466 }
1467
1468
1469 void EmbeddedWorkArea::hideEvent(QHideEvent * ev)
1470 {
1471         disable();
1472         GuiWorkArea::hideEvent(ev);
1473 }
1474
1475
1476 QSize EmbeddedWorkArea::sizeHint () const
1477 {
1478         // FIXME(?):
1479         // GuiWorkArea sets the size to the screen's viewport
1480         // by returning a value this gets overridden
1481         // EmbeddedWorkArea is now sized to fit in the layout
1482         // of the parent, and has a minimum size set in GuiWorkArea
1483         // which is what we return here
1484         return QSize(100, 70);
1485 }
1486
1487
1488 void EmbeddedWorkArea::disable()
1489 {
1490         stopBlinkingCursor();
1491         if (view().currentWorkArea() != this)
1492                 return;
1493         // No problem if currentMainWorkArea() is 0 (setCurrentWorkArea()
1494         // tolerates it and shows the background logo), what happens if
1495         // an EmbeddedWorkArea is closed after closing all document WAs
1496         view().setCurrentWorkArea(view().currentMainWorkArea());
1497 }
1498
1499 ////////////////////////////////////////////////////////////////////
1500 //
1501 // TabWorkArea
1502 //
1503 ////////////////////////////////////////////////////////////////////
1504
1505 #ifdef Q_OS_MAC
1506 class NoTabFrameMacStyle : public QProxyStyle {
1507 public:
1508         ///
1509         QRect subElementRect(SubElement element, const QStyleOption * option,
1510                              const QWidget * widget = 0) const
1511         {
1512                 QRect rect = QProxyStyle::subElementRect(element, option, widget);
1513                 bool noBar = static_cast<QTabWidget const *>(widget)->count() <= 1;
1514
1515                 // The Qt Mac style puts the contents into a 3 pixel wide box
1516                 // which looks very ugly and not like other Mac applications.
1517                 // Hence we remove this here, and moreover the 16 pixel round
1518                 // frame above if the tab bar is hidden.
1519                 if (element == QStyle::SE_TabWidgetTabContents) {
1520                         rect.adjust(- rect.left(), 0, rect.left(), 0);
1521                         if (noBar)
1522                                 rect.setTop(0);
1523                 }
1524
1525                 return rect;
1526         }
1527 };
1528
1529 NoTabFrameMacStyle noTabFrameMacStyle;
1530 #endif
1531
1532
1533 TabWorkArea::TabWorkArea(QWidget * parent)
1534         : QTabWidget(parent), clicked_tab_(-1), midpressed_tab_(-1)
1535 {
1536 #ifdef Q_OS_MAC
1537         setStyle(&noTabFrameMacStyle);
1538 #endif
1539
1540         QPalette pal = palette();
1541         pal.setColor(QPalette::Active, QPalette::Button,
1542                 pal.color(QPalette::Active, QPalette::Window));
1543         pal.setColor(QPalette::Disabled, QPalette::Button,
1544                 pal.color(QPalette::Disabled, QPalette::Window));
1545         pal.setColor(QPalette::Inactive, QPalette::Button,
1546                 pal.color(QPalette::Inactive, QPalette::Window));
1547
1548         QObject::connect(this, SIGNAL(currentChanged(int)),
1549                 this, SLOT(on_currentTabChanged(int)));
1550
1551         closeBufferButton = new QToolButton(this);
1552         closeBufferButton->setPalette(pal);
1553         // FIXME: rename the icon to closebuffer.png
1554         closeBufferButton->setIcon(QIcon(getPixmap("images/", "closetab", "svgz,png")));
1555         closeBufferButton->setText("Close File");
1556         closeBufferButton->setAutoRaise(true);
1557         closeBufferButton->setCursor(Qt::ArrowCursor);
1558         closeBufferButton->setToolTip(qt_("Close File"));
1559         closeBufferButton->setEnabled(true);
1560         QObject::connect(closeBufferButton, SIGNAL(clicked()),
1561                 this, SLOT(closeCurrentBuffer()));
1562         setCornerWidget(closeBufferButton, Qt::TopRightCorner);
1563
1564         // setup drag'n'drop
1565         QTabBar* tb = new DragTabBar;
1566         connect(tb, SIGNAL(tabMoveRequested(int, int)),
1567                 this, SLOT(moveTab(int, int)));
1568         tb->setElideMode(Qt::ElideNone);
1569         setTabBar(tb);
1570
1571         // make us responsible for the context menu of the tabbar
1572         tb->setContextMenuPolicy(Qt::CustomContextMenu);
1573         connect(tb, SIGNAL(customContextMenuRequested(const QPoint &)),
1574                 this, SLOT(showContextMenu(const QPoint &)));
1575         connect(tb, SIGNAL(tabCloseRequested(int)),
1576                 this, SLOT(closeTab(int)));
1577
1578         setUsesScrollButtons(true);
1579 }
1580
1581
1582 void TabWorkArea::mousePressEvent(QMouseEvent *me)
1583 {
1584         if (me->button() == Qt::MidButton)
1585                 midpressed_tab_ = tabBar()->tabAt(me->pos());
1586         else
1587                 QTabWidget::mousePressEvent(me);
1588 }
1589
1590
1591 void TabWorkArea::mouseReleaseEvent(QMouseEvent *me)
1592 {
1593         if (me->button() == Qt::MidButton) {
1594                 int const midreleased_tab = tabBar()->tabAt(me->pos());
1595                 if (midpressed_tab_ == midreleased_tab && posIsTab(me->pos()))
1596                         closeTab(midreleased_tab);
1597         } else
1598                 QTabWidget::mouseReleaseEvent(me);
1599 }
1600
1601
1602 void TabWorkArea::paintEvent(QPaintEvent * event)
1603 {
1604         if (tabBar()->isVisible()) {
1605                 QTabWidget::paintEvent(event);
1606         } else {
1607                 // Prevent the selected tab to influence the
1608                 // painting of the frame of the tab widget.
1609                 // This is needed for gtk style in Qt.
1610                 QStylePainter p(this);
1611 #if QT_VERSION < 0x050000
1612                 QStyleOptionTabWidgetFrameV2 opt;
1613 #else
1614                 QStyleOptionTabWidgetFrame opt;
1615 #endif
1616                 initStyleOption(&opt);
1617                 opt.rect = style()->subElementRect(QStyle::SE_TabWidgetTabPane,
1618                         &opt, this);
1619                 opt.selectedTabRect = QRect();
1620                 p.drawPrimitive(QStyle::PE_FrameTabWidget, opt);
1621         }
1622 }
1623
1624
1625 bool TabWorkArea::posIsTab(QPoint position)
1626 {
1627         // tabAt returns -1 if tab does not covers position
1628         return tabBar()->tabAt(position) > -1;
1629 }
1630
1631
1632 void TabWorkArea::mouseDoubleClickEvent(QMouseEvent * event)
1633 {
1634         if (event->button() != Qt::LeftButton)
1635                 return;
1636
1637         // this code chunk is unnecessary because it seems the event only makes
1638         // it this far if it is not on a tab. I'm not sure why this is (maybe
1639         // it is handled and ended in DragTabBar?), and thus I'm not sure if
1640         // this is true in all cases and if it will be true in the future so I
1641         // leave this code for now. (skostysh, 2016-07-21)
1642         //
1643         // return early if double click on existing tabs
1644         if (posIsTab(event->pos()))
1645                 return;
1646
1647         dispatch(FuncRequest(LFUN_BUFFER_NEW));
1648 }
1649
1650
1651 void TabWorkArea::setFullScreen(bool full_screen)
1652 {
1653         for (int i = 0; i != count(); ++i) {
1654                 if (GuiWorkArea * wa = workArea(i))
1655                         wa->setFullScreen(full_screen);
1656         }
1657
1658         if (lyxrc.full_screen_tabbar)
1659                 showBar(!full_screen && count() > 1);
1660         else
1661                 showBar(count() > 1);
1662 }
1663
1664
1665 void TabWorkArea::showBar(bool show)
1666 {
1667         tabBar()->setEnabled(show);
1668         tabBar()->setVisible(show);
1669         closeBufferButton->setVisible(show && lyxrc.single_close_tab_button);
1670         setTabsClosable(!lyxrc.single_close_tab_button);
1671 }
1672
1673
1674 GuiWorkArea * TabWorkArea::currentWorkArea()
1675 {
1676         if (count() == 0)
1677                 return 0;
1678
1679         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(currentWidget());
1680         LATTEST(wa);
1681         return wa;
1682 }
1683
1684
1685 GuiWorkArea * TabWorkArea::workArea(int index)
1686 {
1687         return dynamic_cast<GuiWorkArea *>(widget(index));
1688 }
1689
1690
1691 GuiWorkArea * TabWorkArea::workArea(Buffer & buffer)
1692 {
1693         // FIXME: this method doesn't work if we have more than work area
1694         // showing the same buffer.
1695         for (int i = 0; i != count(); ++i) {
1696                 GuiWorkArea * wa = workArea(i);
1697                 LASSERT(wa, return 0);
1698                 if (&wa->bufferView().buffer() == &buffer)
1699                         return wa;
1700         }
1701         return 0;
1702 }
1703
1704
1705 void TabWorkArea::closeAll()
1706 {
1707         while (count()) {
1708                 GuiWorkArea * wa = workArea(0);
1709                 LASSERT(wa, return);
1710                 removeTab(0);
1711                 delete wa;
1712         }
1713 }
1714
1715
1716 bool TabWorkArea::setCurrentWorkArea(GuiWorkArea * work_area)
1717 {
1718         LASSERT(work_area, return false);
1719         int index = indexOf(work_area);
1720         if (index == -1)
1721                 return false;
1722
1723         if (index == currentIndex())
1724                 // Make sure the work area is up to date.
1725                 on_currentTabChanged(index);
1726         else
1727                 // Switch to the work area.
1728                 setCurrentIndex(index);
1729         work_area->setFocus();
1730
1731         return true;
1732 }
1733
1734
1735 GuiWorkArea * TabWorkArea::addWorkArea(Buffer & buffer, GuiView & view)
1736 {
1737         GuiWorkArea * wa = new GuiWorkArea(buffer, view);
1738         wa->setUpdatesEnabled(false);
1739         // Hide tabbar if there's no tab (avoid a resize and a flashing tabbar
1740         // when hiding it again below).
1741         if (!(currentWorkArea() && currentWorkArea()->isFullScreen()))
1742                 showBar(count() > 0);
1743         addTab(wa, wa->windowTitle());
1744         QObject::connect(wa, SIGNAL(titleChanged(GuiWorkArea *)),
1745                 this, SLOT(updateTabTexts()));
1746         if (currentWorkArea() && currentWorkArea()->isFullScreen())
1747                 setFullScreen(true);
1748         else
1749                 // Hide tabbar if there's only one tab.
1750                 showBar(count() > 1);
1751
1752         updateTabTexts();
1753
1754         return wa;
1755 }
1756
1757
1758 bool TabWorkArea::removeWorkArea(GuiWorkArea * work_area)
1759 {
1760         LASSERT(work_area, return false);
1761         int index = indexOf(work_area);
1762         if (index == -1)
1763                 return false;
1764
1765         work_area->setUpdatesEnabled(false);
1766         removeTab(index);
1767         delete work_area;
1768
1769         if (count()) {
1770                 // make sure the next work area is enabled.
1771                 currentWidget()->setUpdatesEnabled(true);
1772                 if (currentWorkArea() && currentWorkArea()->isFullScreen())
1773                         setFullScreen(true);
1774                 else
1775                         // Show tabbar only if there's more than one tab.
1776                         showBar(count() > 1);
1777         } else
1778                 lastWorkAreaRemoved();
1779
1780         updateTabTexts();
1781
1782         return true;
1783 }
1784
1785
1786 void TabWorkArea::on_currentTabChanged(int i)
1787 {
1788         // returns e.g. on application destruction
1789         if (i == -1)
1790                 return;
1791         GuiWorkArea * wa = workArea(i);
1792         LASSERT(wa, return);
1793         wa->setUpdatesEnabled(true);
1794         wa->redraw(true);
1795         wa->setFocus();
1796         ///
1797         currentWorkAreaChanged(wa);
1798
1799         LYXERR(Debug::GUI, "currentTabChanged " << i
1800                 << " File: " << wa->bufferView().buffer().absFileName());
1801 }
1802
1803
1804 void TabWorkArea::closeCurrentBuffer()
1805 {
1806         GuiWorkArea * wa;
1807         if (clicked_tab_ == -1)
1808                 wa = currentWorkArea();
1809         else {
1810                 wa = workArea(clicked_tab_);
1811                 LASSERT(wa, return);
1812         }
1813         wa->view().closeWorkArea(wa);
1814 }
1815
1816
1817 void TabWorkArea::hideCurrentTab()
1818 {
1819         GuiWorkArea * wa;
1820         if (clicked_tab_ == -1)
1821                 wa = currentWorkArea();
1822         else {
1823                 wa = workArea(clicked_tab_);
1824                 LASSERT(wa, return);
1825         }
1826         wa->view().hideWorkArea(wa);
1827 }
1828
1829
1830 void TabWorkArea::closeTab(int index)
1831 {
1832         on_currentTabChanged(index);
1833         GuiWorkArea * wa;
1834         if (index == -1)
1835                 wa = currentWorkArea();
1836         else {
1837                 wa = workArea(index);
1838                 LASSERT(wa, return);
1839         }
1840         wa->view().closeWorkArea(wa);
1841 }
1842
1843
1844 ///
1845 class DisplayPath {
1846 public:
1847         /// make vector happy
1848         // coverity[UNINIT_CTOR]
1849         DisplayPath() {}
1850         ///
1851         DisplayPath(int tab, FileName const & filename)
1852                 : tab_(tab)
1853         {
1854                 filename_ = (filename.extension() == "lyx") ?
1855                         toqstr(filename.onlyFileNameWithoutExt())
1856                         : toqstr(filename.onlyFileName());
1857                 postfix_ = toqstr(filename.absoluteFilePath()).
1858                         split("/", QString::SkipEmptyParts);
1859                 postfix_.pop_back();
1860                 abs_ = toqstr(filename.absoluteFilePath());
1861                 dottedPrefix_ = false;
1862         }
1863
1864         /// Absolute path for debugging.
1865         QString abs() const
1866         {
1867                 return abs_;
1868         }
1869         /// Add the first segment from the postfix or three dots to the prefix.
1870         /// Merge multiple dot tripples. In fact dots are added lazily, i.e. only
1871         /// when really needed.
1872         void shiftPathSegment(bool dotted)
1873         {
1874                 if (postfix_.count() <= 0)
1875                         return;
1876
1877                 if (!dotted) {
1878                         if (dottedPrefix_ && !prefix_.isEmpty())
1879                                 prefix_ += ellipsisSlash_;
1880                         prefix_ += postfix_.front() + "/";
1881                 }
1882                 dottedPrefix_ = dotted && !prefix_.isEmpty();
1883                 postfix_.pop_front();
1884         }
1885         ///
1886         QString displayString() const
1887         {
1888                 if (prefix_.isEmpty())
1889                         return filename_;
1890
1891                 bool dots = dottedPrefix_ || !postfix_.isEmpty();
1892                 return prefix_ + (dots ? ellipsisSlash_ : "") + filename_;
1893         }
1894         ///
1895         QString forecastPathString() const
1896         {
1897                 if (postfix_.count() == 0)
1898                         return displayString();
1899
1900                 return prefix_
1901                         + (dottedPrefix_ ? ellipsisSlash_ : "")
1902                         + postfix_.front() + "/";
1903         }
1904         ///
1905         bool final() const { return postfix_.empty(); }
1906         ///
1907         int tab() const { return tab_; }
1908
1909 private:
1910         /// ".../"
1911         static QString const ellipsisSlash_;
1912         ///
1913         QString prefix_;
1914         ///
1915         QStringList postfix_;
1916         ///
1917         QString filename_;
1918         ///
1919         QString abs_;
1920         ///
1921         int tab_;
1922         ///
1923         bool dottedPrefix_;
1924 };
1925
1926
1927 QString const DisplayPath::ellipsisSlash_ = QString(QChar(0x2026)) + "/";
1928
1929
1930 ///
1931 bool operator<(DisplayPath const & a, DisplayPath const & b)
1932 {
1933         return a.displayString() < b.displayString();
1934 }
1935
1936 ///
1937 bool operator==(DisplayPath const & a, DisplayPath const & b)
1938 {
1939         return a.displayString() == b.displayString();
1940 }
1941
1942
1943 void TabWorkArea::updateTabTexts()
1944 {
1945         size_t n = count();
1946         if (n == 0)
1947                 return;
1948         std::list<DisplayPath> paths;
1949         typedef std::list<DisplayPath>::iterator It;
1950
1951         // collect full names first: path into postfix, empty prefix and
1952         // filename without extension
1953         for (size_t i = 0; i < n; ++i) {
1954                 GuiWorkArea * i_wa = workArea(i);
1955                 FileName const fn = i_wa->bufferView().buffer().fileName();
1956                 paths.push_back(DisplayPath(i, fn));
1957         }
1958
1959         // go through path segments and see if it helps to make the path more unique
1960         bool somethingChanged = true;
1961         bool allFinal = false;
1962         while (somethingChanged && !allFinal) {
1963                 // adding path segments changes order
1964                 paths.sort();
1965
1966                 LYXERR(Debug::GUI, "updateTabTexts() iteration start");
1967                 somethingChanged = false;
1968                 allFinal = true;
1969
1970                 // find segments which are not unique (i.e. non-atomic)
1971                 It it = paths.begin();
1972                 It segStart = it;
1973                 QString segString = it->displayString();
1974                 for (; it != paths.end(); ++it) {
1975                         // look to the next item
1976                         It next = it;
1977                         ++next;
1978
1979                         // final?
1980                         allFinal = allFinal && it->final();
1981
1982                         LYXERR(Debug::GUI, "it = " << it->abs()
1983                                << " => " << it->displayString());
1984
1985                         // still the same segment?
1986                         QString nextString;
1987                         if ((next != paths.end()
1988                              && (nextString = next->displayString()) == segString))
1989                                 continue;
1990                         LYXERR(Debug::GUI, "segment ended");
1991
1992                         // only a trivial one with one element?
1993                         if (it == segStart) {
1994                                 // start new segment
1995                                 segStart = next;
1996                                 segString = nextString;
1997                                 continue;
1998                         }
1999
2000                         // we found a non-atomic segment segStart <= sit <= it < next.
2001                         // Shift path segments and hope for the best
2002                         // that it makes the path more unique.
2003                         somethingChanged = true;
2004                         It sit = segStart;
2005                         // this is ok for the reason mentioned  in the previous comment.
2006                         // coverity[INVALIDATE_ITERATOR]
2007                         QString dspString = sit->forecastPathString();
2008                         LYXERR(Debug::GUI, "first forecast found for "
2009                                << sit->abs() << " => " << dspString);
2010                         ++sit;
2011                         bool moreUnique = false;
2012                         for (; sit != next; ++sit) {
2013                                 if (sit->forecastPathString() != dspString) {
2014                                         LYXERR(Debug::GUI, "different forecast found for "
2015                                                 << sit->abs() << " => " << sit->forecastPathString());
2016                                         moreUnique = true;
2017                                         break;
2018                                 }
2019                                 LYXERR(Debug::GUI, "same forecast found for "
2020                                         << sit->abs() << " => " << dspString);
2021                         }
2022
2023                         // if the path segment helped, add it. Otherwise add dots
2024                         bool dots = !moreUnique;
2025                         LYXERR(Debug::GUI, "using dots = " << dots);
2026                         for (sit = segStart; sit != next; ++sit) {
2027                                 sit->shiftPathSegment(dots);
2028                                 LYXERR(Debug::GUI, "shifting "
2029                                         << sit->abs() << " => " << sit->displayString());
2030                         }
2031
2032                         // start new segment
2033                         segStart = next;
2034                         segString = nextString;
2035                 }
2036         }
2037
2038         // set new tab titles
2039         for (It it = paths.begin(); it != paths.end(); ++it) {
2040                 int const tab_index = it->tab();
2041                 Buffer const & buf = workArea(tab_index)->bufferView().buffer();
2042                 QString tab_text = it->displayString().replace("&", "&&");
2043                 if (!buf.fileName().empty() && !buf.isClean())
2044                         tab_text += "*";
2045                 QString tab_tooltip = it->abs();
2046                 if (buf.isReadonly()) {
2047                         setTabIcon(tab_index, QIcon(getPixmap("images/", "emblem-readonly", "svgz,png")));
2048                         tab_tooltip = qt_("%1 (read only)").arg(it->abs());
2049                 } else
2050                         setTabIcon(tab_index, QIcon());
2051                 setTabText(tab_index, tab_text);
2052                 setTabToolTip(tab_index, tab_tooltip);
2053         }
2054 }
2055
2056
2057 void TabWorkArea::showContextMenu(const QPoint & pos)
2058 {
2059         // which tab?
2060         clicked_tab_ = static_cast<DragTabBar *>(tabBar())->tabAt(pos);
2061         if (clicked_tab_ == -1)
2062                 return;
2063
2064         // show tab popup
2065         QMenu popup;
2066         popup.addAction(QIcon(getPixmap("images/", "hidetab", "svgz,png")),
2067                 qt_("Hide tab"), this, SLOT(hideCurrentTab()));
2068         popup.addAction(QIcon(getPixmap("images/", "closetab", "svgz,png")),
2069                 qt_("Close tab"), this, SLOT(closeCurrentBuffer()));
2070         popup.exec(tabBar()->mapToGlobal(pos));
2071
2072         clicked_tab_ = -1;
2073 }
2074
2075
2076 void TabWorkArea::moveTab(int fromIndex, int toIndex)
2077 {
2078         QWidget * w = widget(fromIndex);
2079         QIcon icon = tabIcon(fromIndex);
2080         QString text = tabText(fromIndex);
2081
2082         setCurrentIndex(fromIndex);
2083         removeTab(fromIndex);
2084         insertTab(toIndex, w, icon, text);
2085         setCurrentIndex(toIndex);
2086 }
2087
2088
2089 DragTabBar::DragTabBar(QWidget* parent)
2090         : QTabBar(parent)
2091 {
2092         setAcceptDrops(true);
2093         setTabsClosable(!lyxrc.single_close_tab_button);
2094 }
2095
2096
2097 void DragTabBar::mousePressEvent(QMouseEvent * event)
2098 {
2099         if (event->button() == Qt::LeftButton)
2100                 dragStartPos_ = event->pos();
2101         QTabBar::mousePressEvent(event);
2102 }
2103
2104
2105 void DragTabBar::mouseMoveEvent(QMouseEvent * event)
2106 {
2107         // If the left button isn't pressed anymore then return
2108         if (!(event->buttons() & Qt::LeftButton))
2109                 return;
2110
2111         // If the distance is too small then return
2112         if ((event->pos() - dragStartPos_).manhattanLength()
2113             < QApplication::startDragDistance())
2114                 return;
2115
2116         // did we hit something after all?
2117         int tab = tabAt(dragStartPos_);
2118         if (tab == -1)
2119                 return;
2120
2121         // simulate button release to remove highlight from button
2122         int i = currentIndex();
2123         QMouseEvent me(QEvent::MouseButtonRelease, dragStartPos_,
2124                 event->button(), event->buttons(), 0);
2125         QTabBar::mouseReleaseEvent(&me);
2126         setCurrentIndex(i);
2127
2128         // initiate Drag
2129         QDrag * drag = new QDrag(this);
2130         QMimeData * mimeData = new QMimeData;
2131         // a crude way to distinguish tab-reodering drops from other ones
2132         mimeData->setData("action", "tab-reordering") ;
2133         drag->setMimeData(mimeData);
2134
2135         // get tab pixmap as cursor
2136         QRect r = tabRect(tab);
2137         QPixmap pixmap(r.size());
2138         render(&pixmap, - r.topLeft());
2139         drag->setPixmap(pixmap);
2140         drag->exec();
2141 }
2142
2143
2144 void DragTabBar::dragEnterEvent(QDragEnterEvent * event)
2145 {
2146         // Only accept if it's an tab-reordering request
2147         QMimeData const * m = event->mimeData();
2148         QStringList formats = m->formats();
2149         if (formats.contains("action")
2150             && m->data("action") == "tab-reordering")
2151                 event->acceptProposedAction();
2152 }
2153
2154
2155 void DragTabBar::dropEvent(QDropEvent * event)
2156 {
2157         int fromIndex = tabAt(dragStartPos_);
2158         int toIndex = tabAt(event->pos());
2159
2160         // Tell interested objects that
2161         if (fromIndex != toIndex)
2162                 tabMoveRequested(fromIndex, toIndex);
2163         event->acceptProposedAction();
2164 }
2165
2166
2167 } // namespace frontend
2168 } // namespace lyx
2169
2170 #include "moc_GuiWorkArea.cpp"