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 }
 396
 397
 398 void GuiWorkArea::fixVerticalScrollBar()
 399 {
 400         if (!isFullScreen())
 401                 setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
 402 }
 403
 404
 405 void GuiWorkArea::close()
 406 {
 407         d->lyx_view_->removeWorkArea(this);
 408 }
 409
 410
 411 void GuiWorkArea::setFullScreen(bool full_screen)
 412 {
 413         d->buffer_view_->setFullScreen(full_screen);
 414         setFrameStyle(QFrame::NoFrame);
 415         if (full_screen) {
 416                 setFrameStyle(QFrame::NoFrame);
 417                 if (lyxrc.full_screen_scrollbar)
 418                         setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 419         } else
 420                 setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
 421 }
 422
 423
 424 BufferView & GuiWorkArea::bufferView()
 425 {
 426         return *d->buffer_view_;
 427 }
 428
 429
 430 BufferView const & GuiWorkArea::bufferView() const
 431 {
 432         return *d->buffer_view_;
 433 }
 434
 435
 436 void GuiWorkArea::stopBlinkingCursor()
 437 {
 438         d->cursor_timeout_.stop();
 439         d->hideCursor();
 440 }
 441
 442
 443 void GuiWorkArea::startBlinkingCursor()
 444 {
 445         // do not show the cursor if the view is busy
 446         if (view().busy())
 447                 return;
 448
 449         Point p;
 450         int h = 0;
 451         d->buffer_view_->cursorPosAndHeight(p, h);
 452         // Don't start blinking if the cursor isn't on screen.
 453         if (!d->buffer_view_->cursorInView(p, h))
 454                 return;
 455
 456         d->showCursor();
 457
 458         //we're not supposed to cache this value.
 459         int const time = QApplication::cursorFlashTime() / 2;
 460         if (time <= 0)
 461                 return;
 462         d->cursor_timeout_.setInterval(time);
 463         d->cursor_timeout_.start();
 464 }
 465
 466
 467 void GuiWorkArea::redraw(bool update_metrics)
 468 {
 469         if (!isVisible())
 470                 // No need to redraw in this case.
 471                 return;
 472
 473         // No need to do anything if this is the current view. The BufferView
 474         // metrics are already up to date.
 475         if (update_metrics || d->lyx_view_ != guiApp->currentView()
 476                 || d->lyx_view_->currentWorkArea() != this) {
 477                 // FIXME: it would be nice to optimize for the off-screen case.
 478                 d->buffer_view_->cursor().fixIfBroken();
 479                 d->buffer_view_->updateMetrics();
 480                 d->buffer_view_->cursor().fixIfBroken();
 481         }
 482
 483         // update cursor position, because otherwise it has to wait until
 484         // the blinking interval is over
 485         if (d->cursor_visible_) {
 486                 d->hideCursor();
 487                 d->showCursor();
 488         }
 489
 490         LYXERR(Debug::WORKAREA, "WorkArea::redraw screen");
 491         d->updateScreen();
 492         update(0, 0, viewport()->width(), viewport()->height());
 493
 494         /// \warning: scrollbar updating *must* be done after the BufferView is drawn
 495         /// because \c BufferView::updateScrollbar() is called in \c BufferView::draw().
 496         d->updateScrollbar();
 497         d->lyx_view_->updateStatusBar();
 498
 499         if (lyxerr.debugging(Debug::WORKAREA))
 500                 d->buffer_view_->coordCache().dump();
 501
 502         updateWindowTitle();
 503
 504         d->updateCursorShape();
 505 }
 506
 507
 508 void GuiWorkArea::processKeySym(KeySymbol const & key, KeyModifier mod)
 509 {
 510         if (d->lyx_view_->isFullScreen() && d->lyx_view_->menuBar()->isVisible()
 511                 && lyxrc.full_screen_menubar) {
 512                 // FIXME HACK: we should not have to do this here. See related comment
 513                 // in GuiView::event() (QEvent::ShortcutOverride)
 514                 d->lyx_view_->menuBar()->hide();
 515         }
 516
 517         // In order to avoid bad surprise in the middle of an operation,
 518         // we better stop the blinking cursor...
 519         // the cursor gets restarted in GuiView::restartCursor()
 520         stopBlinkingCursor();
 521         guiApp->processKeySym(key, mod);
 522 }
 523
 524
 525 void GuiWorkArea::Private::dispatch(FuncRequest const & cmd)
 526 {
 527         // Handle drag&drop
 528         if (cmd.action() == LFUN_FILE_OPEN) {
 529                 DispatchResult dr;
 530                 lyx_view_->dispatch(cmd, dr);
 531                 return;
 532         }
 533
 534         bool const notJustMovingTheMouse =
 535                 cmd.action() != LFUN_MOUSE_MOTION || cmd.button() != mouse_button::none;
 536
 537         // In order to avoid bad surprise in the middle of an operation, we better stop
 538         // the blinking cursor.
 539         if (notJustMovingTheMouse)
 540                 p->stopBlinkingCursor();
 541
 542         buffer_view_->mouseEventDispatch(cmd);
 543
 544         // Skip these when selecting
 545         // FIXME: let GuiView take care of those.
 546         if (cmd.action() != LFUN_MOUSE_MOTION) {
 547                 completer_->updateVisibility(false, false);
 548                 lyx_view_->updateDialogs();
 549                 lyx_view_->updateStatusBar();
 550         }
 551
 552         // GUI tweaks except with mouse motion with no button pressed.
 553         if (notJustMovingTheMouse) {
 554                 // Slight hack: this is only called currently when we
 555                 // clicked somewhere, so we force through the display
 556                 // of the new status here.
 557                 // FIXME: let GuiView take care of those.
 558                 lyx_view_->clearMessage();
 559
 560                 // Show the cursor immediately after any operation
 561                 p->startBlinkingCursor();
 562         }
 563
 564         updateCursorShape();
 565 }
 566
 567
 568 void GuiWorkArea::Private::resizeBufferView()
 569 {
 570         // WARNING: Please don't put any code that will trigger a repaint here!
 571         // We are already inside a paint event.
 572         p->stopBlinkingCursor();
 573         // Warn our container (GuiView).
 574         p->busy(true);
 575
 576         Point point;
 577         int h = 0;
 578         buffer_view_->cursorPosAndHeight(point, h);
 579         bool const cursor_in_view = buffer_view_->cursorInView(point, h);
 580         buffer_view_->resize(p->viewport()->width(), p->viewport()->height());
 581         if (cursor_in_view)
 582                 buffer_view_->scrollToCursor();
 583         updateScreen();
 584
 585         // Update scrollbars which might have changed due different
 586         // BufferView dimension. This is especially important when the
 587         // BufferView goes from zero-size to the real-size for the first time,
 588         // as the scrollbar paramters are then set for the first time.
 589         updateScrollbar();
 590
 591         need_resize_ = false;
 592         p->busy(false);
 593         // Eventually, restart the cursor after the resize event.
 594         // We might be resizing even if the focus is on another widget so we only
 595         // restart the cursor if we have the focus.
 596         if (p->hasFocus())
 597                 QTimer::singleShot(50, p, SLOT(startBlinkingCursor()));
 598 }
 599
 600
 601 void GuiWorkArea::Private::showCursor()
 602 {
 603         if (cursor_visible_)
 604                 return;
 605
 606         Point p;
 607         int h = 0;
 608         buffer_view_->cursorPosAndHeight(p, h);
 609         if (!buffer_view_->cursorInView(p, h))
 610                 return;
 611
 612         // RTL or not RTL
 613         bool l_shape = false;
 614         Font const & realfont = buffer_view_->cursor().real_current_font;
 615         BufferParams const & bp = buffer_view_->buffer().params();
 616         bool const samelang = realfont.language() == bp.language;
 617         bool const isrtl = realfont.isVisibleRightToLeft();
 618
 619         if (!samelang || isrtl != bp.language->rightToLeft())
 620                 l_shape = true;
 621
 622         // The ERT language hack needs fixing up
 623         if (realfont.language() == latex_language)
 624                 l_shape = false;
 625
 626         // show cursor on screen
 627         Cursor & cur = buffer_view_->cursor();
 628         bool completable = cur.inset().showCompletionCursor()
 629                 && completer_->completionAvailable()
 630                 && !completer_->popupVisible()
 631                 && !completer_->inlineVisible();
 632         cursor_visible_ = true;
 633         cursor_->recomputeWidth();
 634
 635         //int cur_x = buffer_view_->getPos(cur).x_;
 636         // We may have decided to slide the cursor row so that cursor
 637         // is visible.
 638         p.x_ -= buffer_view_->horizScrollOffset();
 639
 640         showCursor(p.x_, p.y_, h, l_shape, isrtl, completable);
 641 }
 642
 643
 644 void GuiWorkArea::Private::hideCursor()
 645 {
 646         if (!cursor_visible_)
 647                 return;
 648
 649         cursor_visible_ = false;
 650         removeCursor();
 651 }
 652
 653
 654 void GuiWorkArea::toggleCursor()
 655 {
 656         if (d->cursor_visible_)
 657                 d->hideCursor();
 658         else
 659                 d->showCursor();
 660 }
 661
 662
 663 void GuiWorkArea::Private::updateScrollbar()
 664 {
 665         ScrollbarParameters const & scroll_ = buffer_view_->scrollbarParameters();
 666         // WARNING: don't touch at the scrollbar value like this:
 667         //   verticalScrollBar()->setValue(scroll_.position);
 668         // because this would cause a recursive signal/slot calling with
 669         // GuiWorkArea::scrollTo
 670         p->verticalScrollBar()->setRange(scroll_.min, scroll_.max);
 671         p->verticalScrollBar()->setPageStep(scroll_.page_step);
 672         p->verticalScrollBar()->setSingleStep(scroll_.single_step);
 673         p->verticalScrollBar()->setSliderPosition(0);
 674 }
 675
 676
 677 void GuiWorkArea::scrollTo(int value)
 678 {
 679         stopBlinkingCursor();
 680         d->buffer_view_->scrollDocView(value, true);
 681
 682         if (lyxrc.cursor_follows_scrollbar) {
 683                 d->buffer_view_->setCursorFromScrollbar();
 684                 // FIXME: let GuiView take care of those.
 685                 d->lyx_view_->updateLayoutList();
 686         }
 687         // Show the cursor immediately after any operation.
 688         startBlinkingCursor();
 689         // FIXME QT5
 690 #ifdef Q_WS_X11
 691         QApplication::syncX();
 692 #endif
 693 }
 694
 695
 696 bool GuiWorkArea::event(QEvent * e)
 697 {
 698         switch (e->type()) {
 699         case QEvent::ToolTip: {
 700                 QHelpEvent * helpEvent = static_cast<QHelpEvent *>(e);
 701                 if (lyxrc.use_tooltip) {
 702                         QPoint pos = helpEvent->pos();
 703                         if (pos.x() < viewport()->width()) {
 704                                 QString s = toqstr(d->buffer_view_->toolTip(pos.x(), pos.y()));
 705                                 QToolTip::showText(helpEvent->globalPos(), formatToolTip(s,35));
 706                         }
 707                         else
 708                                 QToolTip::hideText();
 709                 }
 710                 // Don't forget to accept the event!
 711                 e->accept();
 712                 return true;
 713         }
 714
 715         case QEvent::KeyPress: {
 716                 // We catch this event in order to catch the Tab or Shift+Tab key press
 717                 // which are otherwise reserved to focus switching between controls
 718                 // within a dialog.
 719                 QKeyEvent * ke = static_cast<QKeyEvent*>(e);
 720                 if ((ke->key() == Qt::Key_Tab && ke->modifiers() == Qt::NoModifier)
 721                         || (ke->key() == Qt::Key_Backtab && (
 722                                 ke->modifiers() == Qt::ShiftModifier
 723                                 || ke->modifiers() == Qt::NoModifier))) {
 724                         keyPressEvent(ke);
 725                         return true;
 726                 }
 727                 return QAbstractScrollArea::event(e);
 728         }
 729
 730         default:
 731                 return QAbstractScrollArea::event(e);
 732         }
 733         return false;
 734 }
 735
 736
 737 void GuiWorkArea::contextMenuEvent(QContextMenuEvent * e)
 738 {
 739         string name;
 740         if (e->reason() == QContextMenuEvent::Mouse)
 741                 // the menu name is set on mouse press
 742                 name = d->context_menu_name_;
 743         else {
 744                 QPoint pos = e->pos();
 745                 Cursor const & cur = d->buffer_view_->cursor();
 746                 if (e->reason() == QContextMenuEvent::Keyboard && cur.inTexted()) {
 747                         // Do not access the context menu of math right in front of before
 748                         // the cursor. This does not work when the cursor is in text.
 749                         Inset * inset = cur.paragraph().getInset(cur.pos());
 750                         if (inset && inset->asInsetMath())
 751                                 --pos.rx();
 752                         else if (cur.pos() > 0) {
 753                                 Inset * inset = cur.paragraph().getInset(cur.pos() - 1);
 754                                 if (inset)
 755                                         ++pos.rx();
 756                         }
 757                 }
 758                 name = d->buffer_view_->contextMenu(pos.x(), pos.y());
 759         }
 760
 761         if (name.empty()) {
 762                 QAbstractScrollArea::contextMenuEvent(e);
 763                 return;
 764         }
 765         // always show mnemonics when the keyboard is used to show the context menu
 766         // FIXME: This should be fixed in Qt itself
 767         bool const keyboard = (e->reason() == QContextMenuEvent::Keyboard);
 768         QMenu * menu = guiApp->menus().menu(toqstr(name), *d->lyx_view_, keyboard);
 769         if (!menu) {
 770                 QAbstractScrollArea::contextMenuEvent(e);
 771                 return;
 772         }
 773         // Position the menu to the right.
 774         // FIXME: menu position should be different for RTL text.
 775         menu->exec(e->globalPos());
 776         e->accept();
 777 }
 778
 779
 780 void GuiWorkArea::focusInEvent(QFocusEvent * e)
 781 {
 782         LYXERR(Debug::DEBUG, "GuiWorkArea::focusInEvent(): " << this << endl);
 783         if (d->lyx_view_->currentWorkArea() != this) {
 784                 d->lyx_view_->setCurrentWorkArea(this);
 785                 d->lyx_view_->currentWorkArea()->bufferView().buffer().updateBuffer();
 786         }
 787
 788         startBlinkingCursor();
 789         QAbstractScrollArea::focusInEvent(e);
 790 }
 791
 792
 793 void GuiWorkArea::focusOutEvent(QFocusEvent * e)
 794 {
 795         LYXERR(Debug::DEBUG, "GuiWorkArea::focusOutEvent(): " << this << endl);
 796         stopBlinkingCursor();
 797         QAbstractScrollArea::focusOutEvent(e);
 798 }
 799
 800
 801 void GuiWorkArea::mousePressEvent(QMouseEvent * e)
 802 {
 803         if (d->dc_event_.active && d->dc_event_ == *e) {
 804                 d->dc_event_.active = false;
 805                 FuncRequest cmd(LFUN_MOUSE_TRIPLE, e->x(), e->y(),
 806                         q_button_state(e->button()), q_key_state(e->modifiers()));
 807                 d->dispatch(cmd);
 808                 e->accept();
 809                 return;
 810         }
 811
 812 #if (QT_VERSION < 0x050000) && !defined(__HAIKU__)
 813         inputContext()->reset();
 814 #endif
 815
 816         FuncRequest const cmd(LFUN_MOUSE_PRESS, e->x(), e->y(),
 817                         q_button_state(e->button()), q_key_state(e->modifiers()));
 818         d->dispatch(cmd);
 819
 820         // Save the context menu on mouse press, because also the mouse
 821         // cursor is set on mouse press. Afterwards, we can either release
 822         // the mousebutton somewhere else, or the cursor might have moved
 823         // due to the DEPM. We need to do this after the mouse has been
 824         // set in dispatch(), because the selection state might change.
 825         if (e->button() == Qt::RightButton)
 826                 d->context_menu_name_ = d->buffer_view_->contextMenu(e->x(), e->y());
 827
 828         e->accept();
 829 }
 830
 831
 832 void GuiWorkArea::mouseReleaseEvent(QMouseEvent * e)
 833 {
 834         if (d->synthetic_mouse_event_.timeout.running())
 835                 d->synthetic_mouse_event_.timeout.stop();
 836
 837         FuncRequest const cmd(LFUN_MOUSE_RELEASE, e->x(), e->y(),
 838                         q_button_state(e->button()), q_key_state(e->modifiers()));
 839         d->dispatch(cmd);
 840         e->accept();
 841 }
 842
 843
 844 void GuiWorkArea::mouseMoveEvent(QMouseEvent * e)
 845 {
 846         // we kill the triple click if we move
 847         doubleClickTimeout();
 848         FuncRequest cmd(LFUN_MOUSE_MOTION, e->x(), e->y(),
 849                         q_motion_state(e->buttons()), q_key_state(e->modifiers()));
 850
 851         e->accept();
 852
 853         // If we're above or below the work area...
 854         if ((e->y() <= 20 || e->y() >= viewport()->height() - 20)
 855                         && e->buttons() == mouse_button::button1) {
 856                 // Make sure only a synthetic event can cause a page scroll,
 857                 // so they come at a steady rate:
 858                 if (e->y() <= 20)
 859                         // _Force_ a scroll up:
 860                         cmd.set_y(e->y() - 21);
 861                 else
 862                         cmd.set_y(e->y() + 21);
 863                 // Store the event, to be handled when the timeout expires.
 864                 d->synthetic_mouse_event_.cmd = cmd;
 865
 866                 if (d->synthetic_mouse_event_.timeout.running()) {
 867                         // Discard the event. Note that it _may_ be handled
 868                         // when the timeout expires if
 869                         // synthetic_mouse_event_.cmd has not been overwritten.
 870                         // Ie, when the timeout expires, we handle the
 871                         // most recent event but discard all others that
 872                         // occurred after the one used to start the timeout
 873                         // in the first place.
 874                         return;
 875                 }
 876
 877                 d->synthetic_mouse_event_.restart_timeout = true;
 878                 d->synthetic_mouse_event_.timeout.start();
 879                 // Fall through to handle this event...
 880
 881         } else if (d->synthetic_mouse_event_.timeout.running()) {
 882                 // Store the event, to be possibly handled when the timeout
 883                 // expires.
 884                 // Once the timeout has expired, normal control is returned
 885                 // to mouseMoveEvent (restart_timeout = false).
 886                 // This results in a much smoother 'feel' when moving the
 887                 // mouse back into the work area.
 888                 d->synthetic_mouse_event_.cmd = cmd;
 889                 d->synthetic_mouse_event_.restart_timeout = false;
 890                 return;
 891         }
 892         d->dispatch(cmd);
 893 }
 894
 895
 896 void GuiWorkArea::wheelEvent(QWheelEvent * ev)
 897 {
 898         // Wheel rotation by one notch results in a delta() of 120 (see
 899         // documentation of QWheelEvent)
 900         double const delta = ev->delta() / 120.0;
 901         bool zoom = false;
 902         switch (lyxrc.scroll_wheel_zoom) {
 903         case LyXRC::SCROLL_WHEEL_ZOOM_CTRL:
 904                 zoom = ev->modifiers() & Qt::ControlModifier;
 905                 zoom &= !(ev->modifiers() & (Qt::ShiftModifier | Qt::AltModifier));
 906                 break;
 907         case LyXRC::SCROLL_WHEEL_ZOOM_SHIFT:
 908                 zoom = ev->modifiers() & Qt::ShiftModifier;
 909                 zoom &= !(ev->modifiers() & (Qt::ControlModifier | Qt::AltModifier));
 910                 break;
 911         case LyXRC::SCROLL_WHEEL_ZOOM_ALT:
 912                 zoom = ev->modifiers() & Qt::AltModifier;
 913                 zoom &= !(ev->modifiers() & (Qt::ShiftModifier | Qt::ControlModifier));
 914                 break;
 915         case LyXRC::SCROLL_WHEEL_ZOOM_OFF:
 916                 break;
 917         }
 918         if (zoom) {
 919                 docstring arg = convert<docstring>(int(5 * delta));
 920                 lyx::dispatch(FuncRequest(LFUN_BUFFER_ZOOM_IN, arg));
 921                 return;
 922         }
 923
 924         // Take into account the desktop wide settings.
 925         int const lines = qApp->wheelScrollLines();
 926         int const page_step = verticalScrollBar()->pageStep();
 927         // Test if the wheel mouse is set to one screen at a time.
 928         // This is according to
 929         // https://doc.qt.io/qt-5/qapplication.html#wheelScrollLines-prop
 930         int scroll_value =
 931                 min(lines * verticalScrollBar()->singleStep(), page_step);
 932
 933         // Take into account the rotation and the user preferences.
 934         scroll_value = int(scroll_value * delta * lyxrc.mouse_wheel_speed);
 935         LYXERR(Debug::SCROLLING, "wheelScrollLines = " << lines
 936                         << " delta = " << delta << " scroll_value = " << scroll_value
 937                         << " page_step = " << page_step);
 938         // Now scroll.
 939         verticalScrollBar()->setValue(verticalScrollBar()->value() - scroll_value);
 940
 941         ev->accept();
 942 }
 943
 944
 945 void GuiWorkArea::generateSyntheticMouseEvent()
 946 {
 947         int const e_y = d->synthetic_mouse_event_.cmd.y();
 948         int const wh = d->buffer_view_->workHeight();
 949         bool const up = e_y < 0;
 950         bool const down = e_y > wh;
 951
 952         // Set things off to generate the _next_ 'pseudo' event.
 953         int step = 50;
 954         if (d->synthetic_mouse_event_.restart_timeout) {
 955                 // This is some magic formulae to determine the speed
 956                 // of scrolling related to the position of the mouse.
 957                 int time = 200;
 958                 if (up || down) {
 959                         int dist = up ? -e_y : e_y - wh;
 960                         time = max(min(200, 250000 / (dist * dist)), 1) ;
 961
 962                         if (time < 40) {
 963                                 step = 80000 / (time * time);
 964                                 time = 40;
 965                         }
 966                 }
 967                 d->synthetic_mouse_event_.timeout.setTimeout(time);
 968                 d->synthetic_mouse_event_.timeout.start();
 969         }
 970
 971         // Can we scroll further ?
 972         int const value = verticalScrollBar()->value();
 973         if (value == verticalScrollBar()->maximum()
 974                   || value == verticalScrollBar()->minimum()) {
 975                 d->synthetic_mouse_event_.timeout.stop();
 976                 return;
 977         }
 978
 979         // Scroll
 980         if (step <= 2 * wh) {
 981                 d->buffer_view_->scroll(up ? -step : step);
 982                 d->buffer_view_->updateMetrics();
 983         } else {
 984                 d->buffer_view_->scrollDocView(value + (up ? -step : step), false);
 985         }
 986
 987         // In which paragraph do we have to set the cursor ?
 988         Cursor & cur = d->buffer_view_->cursor();
 989         // FIXME: we don't know howto handle math.
 990         Text * text = cur.text();
 991         if (!text)
 992                 return;
 993         TextMetrics const & tm = d->buffer_view_->textMetrics(text);
 994
 995         pair<pit_type, const ParagraphMetrics *> pp = up ? tm.first() : tm.last();
 996         ParagraphMetrics const & pm = *pp.second;
 997         pit_type const pit = pp.first;
 998
 999         if (pm.rows().empty())
1000                 return;
1001
1002         // Find the row at which we set the cursor.
1003         RowList::const_iterator rit = pm.rows().begin();
1004         RowList::const_iterator rlast = pm.rows().end();
1005         int yy = pm.position() - pm.ascent();
1006         for (--rlast; rit != rlast; ++rit) {
1007                 int h = rit->height();
1008                 if ((up && yy + h > 0)
1009                           || (!up && yy + h > wh - defaultRowHeight()))
1010                         break;
1011                 yy += h;
1012         }
1013
1014         // Find the position of the cursor
1015         bool bound;
1016         int x = d->synthetic_mouse_event_.cmd.x();
1017         pos_type const pos = tm.getPosNearX(*rit, x, bound);
1018
1019         // Set the cursor
1020         cur.pit() = pit;
1021         cur.pos() = pos;
1022         cur.boundary(bound);
1023
1024         d->buffer_view_->buffer().changed(false);
1025         return;
1026 }
1027
1028
1029 void GuiWorkArea::keyPressEvent(QKeyEvent * ev)
1030 {
1031         // Do not process here some keys if dialog_mode_ is set
1032         if (d->dialog_mode_
1033                 && (ev->modifiers() == Qt::NoModifier
1034                     || ev->modifiers() == Qt::ShiftModifier)
1035                 && (ev->key() == Qt::Key_Escape
1036                     || ev->key() == Qt::Key_Enter
1037                     || ev->key() == Qt::Key_Return)
1038             ) {
1039                 ev->ignore();
1040                 return;
1041         }
1042
1043         // intercept some keys if completion popup is visible
1044         if (d->completer_->popupVisible()) {
1045                 switch (ev->key()) {
1046                 case Qt::Key_Enter:
1047                 case Qt::Key_Return:
1048                         d->completer_->activate();
1049                         ev->accept();
1050                         return;
1051                 }
1052         }
1053
1054         // do nothing if there are other events
1055         // (the auto repeated events come too fast)
1056         // it looks like this is only needed on X11
1057 #if defined(Q_WS_X11) || defined(QPA_XCB)
1058         if (qApp->hasPendingEvents() && ev->isAutoRepeat()) {
1059                 switch (ev->key()) {
1060                 case Qt::Key_PageDown:
1061                 case Qt::Key_PageUp:
1062                 case Qt::Key_Left:
1063                 case Qt::Key_Right:
1064                 case Qt::Key_Up:
1065                 case Qt::Key_Down:
1066                         LYXERR(Debug::KEY, "system is busy: scroll key event ignored");
1067                         ev->ignore();
1068                         return;
1069                 }
1070         }
1071 #endif
1072
1073         KeyModifier m = q_key_state(ev->modifiers());
1074
1075         std::string str;
1076         if (m & ShiftModifier)
1077                 str += "Shift-";
1078         if (m & ControlModifier)
1079                 str += "Control-";
1080         if (m & AltModifier)
1081                 str += "Alt-";
1082         if (m & MetaModifier)
1083                 str += "Meta-";
1084
1085         LYXERR(Debug::KEY, " count: " << ev->count() << " text: " << ev->text()
1086                 << " isAutoRepeat: " << ev->isAutoRepeat() << " key: " << ev->key()
1087                 << " keyState: " << str);
1088
1089         KeySymbol sym;
1090         setKeySymbol(&sym, ev);
1091         if (sym.isOK()) {
1092                 processKeySym(sym, q_key_state(ev->modifiers()));
1093                 ev->accept();
1094         } else {
1095                 ev->ignore();
1096         }
1097 }
1098
1099
1100 void GuiWorkArea::doubleClickTimeout()
1101 {
1102         d->dc_event_.active = false;
1103 }
1104
1105
1106 void GuiWorkArea::mouseDoubleClickEvent(QMouseEvent * ev)
1107 {
1108         d->dc_event_ = DoubleClick(ev);
1109         QTimer::singleShot(QApplication::doubleClickInterval(), this,
1110                         SLOT(doubleClickTimeout()));
1111         FuncRequest cmd(LFUN_MOUSE_DOUBLE, ev->x(), ev->y(),
1112                         q_button_state(ev->button()), q_key_state(ev->modifiers()));
1113         d->dispatch(cmd);
1114         ev->accept();
1115 }
1116
1117
1118 void GuiWorkArea::resizeEvent(QResizeEvent * ev)
1119 {
1120         QAbstractScrollArea::resizeEvent(ev);
1121         d->need_resize_ = true;
1122         ev->accept();
1123 }
1124
1125
1126 void GuiWorkArea::Private::update(int x, int y, int w, int h)
1127 {
1128         p->viewport()->update(x, y, w, h);
1129 }
1130
1131
1132 void GuiWorkArea::paintEvent(QPaintEvent * ev)
1133 {
1134         QRectF const rc = ev->rect();
1135         // LYXERR(Debug::PAINTING, "paintEvent begin: x: " << rc.x()
1136         //      << " y: " << rc.y() << " w: " << rc.width() << " h: " << rc.height());
1137
1138         if (d->needResize()) {
1139                 d->resetScreen();
1140                 d->resizeBufferView();
1141                 if (d->cursor_visible_) {
1142                         d->hideCursor();
1143                         d->showCursor();
1144                 }
1145         }
1146
1147         QPainter pain(viewport());
1148         double const pr = pixelRatio();
1149         QRectF const rcs = QRectF(rc.x() * pr, rc.y() * pr, rc.width() * pr, rc.height() * pr);
1150
1151         if (lyxrc.use_qimage) {
1152                 QImage const & image = static_cast<QImage const &>(*d->screen_);
1153                 pain.drawImage(rc, image, rcs);
1154         } else {
1155                 QPixmap const & pixmap = static_cast<QPixmap const &>(*d->screen_);
1156                 pain.drawPixmap(rc, pixmap, rcs);
1157         }
1158         d->cursor_->draw(pain);
1159         ev->accept();
1160 }
1161
1162
1163 void GuiWorkArea::Private::updateScreen()
1164 {
1165         GuiPainter pain(screen_, p->pixelRatio());
1166         buffer_view_->draw(pain);
1167 }
1168
1169
1170 void GuiWorkArea::Private::showCursor(int x, int y, int h,
1171         bool l_shape, bool rtl, bool completable)
1172 {
1173         if (schedule_redraw_) {
1174                 // This happens when a graphic conversion is finished. As we don't know
1175                 // the size of the new graphics, it's better the update everything.
1176                 // We can't use redraw() here because this would trigger a infinite
1177                 // recursive loop with showCursor().
1178                 buffer_view_->resize(p->viewport()->width(), p->viewport()->height());
1179                 updateScreen();
1180                 updateScrollbar();
1181                 p->viewport()->update(QRect(0, 0, p->viewport()->width(), p->viewport()->height()));
1182                 schedule_redraw_ = false;
1183                 // Show the cursor immediately after the update.
1184                 hideCursor();
1185                 p->toggleCursor();
1186                 return;
1187         }
1188
1189         cursor_->update(x, y, h, l_shape, rtl, completable);
1190         cursor_->show();
1191         p->viewport()->update(cursor_->rect());
1192 }
1193
1194
1195 void GuiWorkArea::Private::removeCursor()
1196 {
1197         cursor_->hide();
1198         //if (!qApp->focusWidget())
1199                 p->viewport()->update(cursor_->rect());
1200 }
1201
1202
1203 void GuiWorkArea::inputMethodEvent(QInputMethodEvent * e)
1204 {
1205         QString const & commit_string = e->commitString();
1206         docstring const & preedit_string
1207                 = qstring_to_ucs4(e->preeditString());
1208
1209         if (!commit_string.isEmpty()) {
1210
1211                 LYXERR(Debug::KEY, "preeditString: " << e->preeditString()
1212                         << " commitString: " << e->commitString());
1213
1214                 int key = 0;
1215
1216                 // FIXME Iwami 04/01/07: we should take care also of UTF16 surrogates here.
1217                 for (int i = 0; i != commit_string.size(); ++i) {
1218                         QKeyEvent ev(QEvent::KeyPress, key, Qt::NoModifier, commit_string[i]);
1219                         keyPressEvent(&ev);
1220                 }
1221         }
1222
1223         // Hide the cursor during the kana-kanji transformation.
1224         if (preedit_string.empty())
1225                 startBlinkingCursor();
1226         else
1227                 stopBlinkingCursor();
1228
1229         // last_width : for checking if last preedit string was/wasn't empty.
1230         // FIXME THREAD
1231         // We could have more than one work area, right?
1232         static bool last_width = false;
1233         if (!last_width && preedit_string.empty()) {
1234                 // if last_width is last length of preedit string.
1235                 e->accept();
1236                 return;
1237         }
1238
1239         GuiPainter pain(d->screen_, pixelRatio());
1240         d->buffer_view_->updateMetrics();
1241         d->buffer_view_->draw(pain);
1242         FontInfo font = d->buffer_view_->cursor().getFont().fontInfo();
1243         FontMetrics const & fm = theFontMetrics(font);
1244         int height = fm.maxHeight();
1245         int cur_x = d->cursor_->rect().left();
1246         int cur_y = d->cursor_->rect().bottom();
1247
1248         // redraw area of preedit string.
1249         update(0, cur_y - height, viewport()->width(),
1250                 (height + 1) * d->preedit_lines_);
1251
1252         if (preedit_string.empty()) {
1253                 last_width = false;
1254                 d->preedit_lines_ = 1;
1255                 e->accept();
1256                 return;
1257         }
1258         last_width = true;
1259
1260         // att : stores an IM attribute.
1261         QList<QInputMethodEvent::Attribute> const & att = e->attributes();
1262
1263         // get attributes of input method cursor.
1264         // cursor_pos : cursor position in preedit string.
1265         size_t cursor_pos = 0;
1266         bool cursor_is_visible = false;
1267         for (int i = 0; i != att.size(); ++i) {
1268                 if (att.at(i).type == QInputMethodEvent::Cursor) {
1269                         cursor_pos = att.at(i).start;
1270                         cursor_is_visible = att.at(i).length != 0;
1271                         break;
1272                 }
1273         }
1274
1275         size_t preedit_length = preedit_string.length();
1276
1277         // get position of selection in input method.
1278         // FIXME: isn't there a way to do this simplier?
1279         // rStart : cursor position in selected string in IM.
1280         size_t rStart = 0;
1281         // rLength : selected string length in IM.
1282         size_t rLength = 0;
1283         if (cursor_pos < preedit_length) {
1284                 for (int i = 0; i != att.size(); ++i) {
1285                         if (att.at(i).type == QInputMethodEvent::TextFormat) {
1286                                 if (att.at(i).start <= int(cursor_pos)
1287                                         && int(cursor_pos) < att.at(i).start + att.at(i).length) {
1288                                                 rStart = att.at(i).start;
1289                                                 rLength = att.at(i).length;
1290                                                 if (!cursor_is_visible)
1291                                                         cursor_pos += rLength;
1292                                                 break;
1293                                 }
1294                         }
1295                 }
1296         }
1297         else {
1298                 rStart = cursor_pos;
1299                 rLength = 0;
1300         }
1301
1302         int const right_margin = d->buffer_view_->rightMargin();
1303         Painter::preedit_style ps;
1304         // Most often there would be only one line:
1305         d->preedit_lines_ = 1;
1306         for (size_t pos = 0; pos != preedit_length; ++pos) {
1307                 char_type const typed_char = preedit_string[pos];
1308                 // reset preedit string style
1309                 ps = Painter::preedit_default;
1310
1311                 // if we reached the right extremity of the screen, go to next line.
1312                 if (cur_x + fm.width(typed_char) > viewport()->width() - right_margin) {
1313                         cur_x = right_margin;
1314                         cur_y += height + 1;
1315                         ++d->preedit_lines_;
1316                 }
1317                 // preedit strings are displayed with dashed underline
1318                 // and partial strings are displayed white on black indicating
1319                 // that we are in selecting mode in the input method.
1320                 // FIXME: rLength == preedit_length is not a changing condition
1321                 // FIXME: should be put out of the loop.
1322                 if (pos >= rStart
1323                         && pos < rStart + rLength
1324                         && !(cursor_pos < rLength && rLength == preedit_length))
1325                         ps = Painter::preedit_selecting;
1326
1327                 if (pos == cursor_pos
1328                         && (cursor_pos < rLength && rLength == preedit_length))
1329                         ps = Painter::preedit_cursor;
1330
1331                 // draw one character and update cur_x.
1332                 cur_x += pain.preeditText(cur_x, cur_y, typed_char, font, ps);
1333         }
1334
1335         // update the preedit string screen area.
1336         update(0, cur_y - d->preedit_lines_*height, viewport()->width(),
1337                 (height + 1) * d->preedit_lines_);
1338
1339         // Don't forget to accept the event!
1340         e->accept();
1341 }
1342
1343
1344 QVariant GuiWorkArea::inputMethodQuery(Qt::InputMethodQuery query) const
1345 {
1346         QRect cur_r(0, 0, 0, 0);
1347         switch (query) {
1348                 // this is the CJK-specific composition window position and
1349                 // the context menu position when the menu key is pressed.
1350                 case Qt::ImMicroFocus:
1351                         cur_r = d->cursor_->rect();
1352                         if (d->preedit_lines_ != 1)
1353                                 cur_r.moveLeft(10);
1354                         cur_r.moveBottom(cur_r.bottom()
1355                                 + cur_r.height() * (d->preedit_lines_ - 1));
1356                         // return lower right of cursor in LyX.
1357                         return cur_r;
1358                 default:
1359                         return QWidget::inputMethodQuery(query);
1360         }
1361 }
1362
1363
1364 void GuiWorkArea::updateWindowTitle()
1365 {
1366         docstring maximize_title;
1367         docstring minimize_title;
1368
1369         Buffer const & buf = d->buffer_view_->buffer();
1370         FileName const file_name = buf.fileName();
1371         if (!file_name.empty()) {
1372                 maximize_title = file_name.displayName(130);
1373                 minimize_title = from_utf8(file_name.onlyFileName());
1374                 if (buf.lyxvc().inUse()) {
1375                         if (buf.lyxvc().locking())
1376                                 maximize_title +=  _(" (version control, locking)");
1377                         else
1378                                 maximize_title +=  _(" (version control)");
1379                 }
1380                 if (!buf.isClean()) {
1381                         maximize_title += _(" (changed)");
1382                         minimize_title += char_type('*');
1383                 }
1384                 if (buf.isReadonly())
1385                         maximize_title += _(" (read only)");
1386         }
1387
1388         QString const new_title = toqstr(maximize_title);
1389         if (new_title != windowTitle()) {
1390                 QWidget::setWindowTitle(new_title);
1391                 QWidget::setWindowIconText(toqstr(minimize_title));
1392                 titleChanged(this);
1393         }
1394 }
1395
1396
1397 bool GuiWorkArea::isFullScreen() const
1398 {
1399         return d->lyx_view_ && d->lyx_view_->isFullScreen();
1400 }
1401
1402
1403 void GuiWorkArea::scheduleRedraw()
1404 {
1405         d->schedule_redraw_ = true;
1406 }
1407
1408
1409 bool GuiWorkArea::inDialogMode() const
1410 {
1411         return d->dialog_mode_;
1412 }
1413
1414
1415 void GuiWorkArea::setDialogMode(bool mode)
1416 {
1417         d->dialog_mode_ = mode;
1418 }
1419
1420
1421 GuiCompleter & GuiWorkArea::completer()
1422 {
1423         return *d->completer_;
1424 }
1425
1426 GuiView const & GuiWorkArea::view() const
1427 {
1428         return *d->lyx_view_;
1429 }
1430
1431
1432 GuiView & GuiWorkArea::view()
1433 {
1434         return *d->lyx_view_;
1435 }
1436
1437 ////////////////////////////////////////////////////////////////////
1438 //
1439 // EmbeddedWorkArea
1440 //
1441 ////////////////////////////////////////////////////////////////////
1442
1443
1444 EmbeddedWorkArea::EmbeddedWorkArea(QWidget * w): GuiWorkArea(w)
1445 {
1446         support::TempFile tempfile("embedded.internal");
1447         tempfile.setAutoRemove(false);
1448         buffer_ = theBufferList().newInternalBuffer(tempfile.name().absFileName());
1449         buffer_->setUnnamed(true);
1450         buffer_->setFullyLoaded(true);
1451         setBuffer(*buffer_);
1452         setDialogMode(true);
1453 }
1454
1455
1456 EmbeddedWorkArea::~EmbeddedWorkArea()
1457 {
1458         // No need to destroy buffer and bufferview here, because it is done
1459         // in theBufferList() destruction loop at application exit
1460 }
1461
1462
1463 void EmbeddedWorkArea::closeEvent(QCloseEvent * ev)
1464 {
1465         disable();
1466         GuiWorkArea::closeEvent(ev);
1467 }
1468
1469
1470 void EmbeddedWorkArea::hideEvent(QHideEvent * ev)
1471 {
1472         disable();
1473         GuiWorkArea::hideEvent(ev);
1474 }
1475
1476
1477 QSize EmbeddedWorkArea::sizeHint () const
1478 {
1479         // FIXME(?):
1480         // GuiWorkArea sets the size to the screen's viewport
1481         // by returning a value this gets overridden
1482         // EmbeddedWorkArea is now sized to fit in the layout
1483         // of the parent, and has a minimum size set in GuiWorkArea
1484         // which is what we return here
1485         return QSize(100, 70);
1486 }
1487
1488
1489 void EmbeddedWorkArea::disable()
1490 {
1491         stopBlinkingCursor();
1492         if (view().currentWorkArea() != this)
1493                 return;
1494         // No problem if currentMainWorkArea() is 0 (setCurrentWorkArea()
1495         // tolerates it and shows the background logo), what happens if
1496         // an EmbeddedWorkArea is closed after closing all document WAs
1497         view().setCurrentWorkArea(view().currentMainWorkArea());
1498 }
1499
1500 ////////////////////////////////////////////////////////////////////
1501 //
1502 // TabWorkArea
1503 //
1504 ////////////////////////////////////////////////////////////////////
1505
1506 #ifdef Q_OS_MAC
1507 class NoTabFrameMacStyle : public QProxyStyle {
1508 public:
1509         ///
1510         QRect subElementRect(SubElement element, const QStyleOption * option,
1511                              const QWidget * widget = 0) const
1512         {
1513                 QRect rect = QProxyStyle::subElementRect(element, option, widget);
1514                 bool noBar = static_cast<QTabWidget const *>(widget)->count() <= 1;
1515
1516                 // The Qt Mac style puts the contents into a 3 pixel wide box
1517                 // which looks very ugly and not like other Mac applications.
1518                 // Hence we remove this here, and moreover the 16 pixel round
1519                 // frame above if the tab bar is hidden.
1520                 if (element == QStyle::SE_TabWidgetTabContents) {
1521                         rect.adjust(- rect.left(), 0, rect.left(), 0);
1522                         if (noBar)
1523                                 rect.setTop(0);
1524                 }
1525
1526                 return rect;
1527         }
1528 };
1529
1530 NoTabFrameMacStyle noTabFrameMacStyle;
1531 #endif
1532
1533
1534 TabWorkArea::TabWorkArea(QWidget * parent)
1535         : QTabWidget(parent), clicked_tab_(-1)
1536 {
1537 #ifdef Q_OS_MAC
1538         setStyle(&noTabFrameMacStyle);
1539 #endif
1540
1541         QPalette pal = palette();
1542         pal.setColor(QPalette::Active, QPalette::Button,
1543                 pal.color(QPalette::Active, QPalette::Window));
1544         pal.setColor(QPalette::Disabled, QPalette::Button,
1545                 pal.color(QPalette::Disabled, QPalette::Window));
1546         pal.setColor(QPalette::Inactive, QPalette::Button,
1547                 pal.color(QPalette::Inactive, QPalette::Window));
1548
1549         QObject::connect(this, SIGNAL(currentChanged(int)),
1550                 this, SLOT(on_currentTabChanged(int)));
1551
1552         closeBufferButton = new QToolButton(this);
1553         closeBufferButton->setPalette(pal);
1554         // FIXME: rename the icon to closebuffer.png
1555         closeBufferButton->setIcon(QIcon(getPixmap("images/", "closetab", "svgz,png")));
1556         closeBufferButton->setText("Close File");
1557         closeBufferButton->setAutoRaise(true);
1558         closeBufferButton->setCursor(Qt::ArrowCursor);
1559         closeBufferButton->setToolTip(qt_("Close File"));
1560         closeBufferButton->setEnabled(true);
1561         QObject::connect(closeBufferButton, SIGNAL(clicked()),
1562                 this, SLOT(closeCurrentBuffer()));
1563         setCornerWidget(closeBufferButton, Qt::TopRightCorner);
1564
1565         // setup drag'n'drop
1566         QTabBar* tb = new DragTabBar;
1567         connect(tb, SIGNAL(tabMoveRequested(int, int)),
1568                 this, SLOT(moveTab(int, int)));
1569         tb->setElideMode(Qt::ElideNone);
1570         setTabBar(tb);
1571
1572         // make us responsible for the context menu of the tabbar
1573         tb->setContextMenuPolicy(Qt::CustomContextMenu);
1574         connect(tb, SIGNAL(customContextMenuRequested(const QPoint &)),
1575                 this, SLOT(showContextMenu(const QPoint &)));
1576         connect(tb, SIGNAL(tabCloseRequested(int)),
1577                 this, SLOT(closeTab(int)));
1578
1579         setUsesScrollButtons(true);
1580 }
1581
1582
1583 void TabWorkArea::paintEvent(QPaintEvent * event)
1584 {
1585         if (tabBar()->isVisible()) {
1586                 QTabWidget::paintEvent(event);
1587         } else {
1588                 // Prevent the selected tab to influence the
1589                 // painting of the frame of the tab widget.
1590                 // This is needed for gtk style in Qt.
1591                 QStylePainter p(this);
1592 #if QT_VERSION < 0x050000
1593                 QStyleOptionTabWidgetFrameV2 opt;
1594 #else
1595                 QStyleOptionTabWidgetFrame opt;
1596 #endif
1597                 initStyleOption(&opt);
1598                 opt.rect = style()->subElementRect(QStyle::SE_TabWidgetTabPane,
1599                         &opt, this);
1600                 opt.selectedTabRect = QRect();
1601                 p.drawPrimitive(QStyle::PE_FrameTabWidget, opt);
1602         }
1603 }
1604
1605
1606 void TabWorkArea::mouseDoubleClickEvent(QMouseEvent * event)
1607 {
1608         if (event->button() != Qt::LeftButton)
1609                 return;
1610
1611         // return early if double click on existing tabs
1612         for (int i = 0; i < count(); ++i)
1613                 if (tabBar()->tabRect(i).contains(event->pos()))
1614                         return;
1615
1616         dispatch(FuncRequest(LFUN_BUFFER_NEW));
1617 }
1618
1619
1620 void TabWorkArea::setFullScreen(bool full_screen)
1621 {
1622         for (int i = 0; i != count(); ++i) {
1623                 if (GuiWorkArea * wa = workArea(i))
1624                         wa->setFullScreen(full_screen);
1625         }
1626
1627         if (lyxrc.full_screen_tabbar)
1628                 showBar(!full_screen && count() > 1);
1629         else
1630                 showBar(count() > 1);
1631 }
1632
1633
1634 void TabWorkArea::showBar(bool show)
1635 {
1636         tabBar()->setEnabled(show);
1637         tabBar()->setVisible(show);
1638         closeBufferButton->setVisible(show && lyxrc.single_close_tab_button);
1639         setTabsClosable(!lyxrc.single_close_tab_button);
1640 }
1641
1642
1643 GuiWorkArea * TabWorkArea::currentWorkArea()
1644 {
1645         if (count() == 0)
1646                 return 0;
1647
1648         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(currentWidget());
1649         LATTEST(wa);
1650         return wa;
1651 }
1652
1653
1654 GuiWorkArea * TabWorkArea::workArea(int index)
1655 {
1656         return dynamic_cast<GuiWorkArea *>(widget(index));
1657 }
1658
1659
1660 GuiWorkArea * TabWorkArea::workArea(Buffer & buffer)
1661 {
1662         // FIXME: this method doesn't work if we have more than work area
1663         // showing the same buffer.
1664         for (int i = 0; i != count(); ++i) {
1665                 GuiWorkArea * wa = workArea(i);
1666                 LASSERT(wa, return 0);
1667                 if (&wa->bufferView().buffer() == &buffer)
1668                         return wa;
1669         }
1670         return 0;
1671 }
1672
1673
1674 void TabWorkArea::closeAll()
1675 {
1676         while (count()) {
1677                 GuiWorkArea * wa = workArea(0);
1678                 LASSERT(wa, return);
1679                 removeTab(0);
1680                 delete wa;
1681         }
1682 }
1683
1684
1685 bool TabWorkArea::setCurrentWorkArea(GuiWorkArea * work_area)
1686 {
1687         LASSERT(work_area, return false);
1688         int index = indexOf(work_area);
1689         if (index == -1)
1690                 return false;
1691
1692         if (index == currentIndex())
1693                 // Make sure the work area is up to date.
1694                 on_currentTabChanged(index);
1695         else
1696                 // Switch to the work area.
1697                 setCurrentIndex(index);
1698         work_area->setFocus();
1699
1700         return true;
1701 }
1702
1703
1704 GuiWorkArea * TabWorkArea::addWorkArea(Buffer & buffer, GuiView & view)
1705 {
1706         GuiWorkArea * wa = new GuiWorkArea(buffer, view);
1707         wa->setUpdatesEnabled(false);
1708         // Hide tabbar if there's no tab (avoid a resize and a flashing tabbar
1709         // when hiding it again below).
1710         if (!(currentWorkArea() && currentWorkArea()->isFullScreen()))
1711                 showBar(count() > 0);
1712         addTab(wa, wa->windowTitle());
1713         QObject::connect(wa, SIGNAL(titleChanged(GuiWorkArea *)),
1714                 this, SLOT(updateTabTexts()));
1715         if (currentWorkArea() && currentWorkArea()->isFullScreen())
1716                 setFullScreen(true);
1717         else
1718                 // Hide tabbar if there's only one tab.
1719                 showBar(count() > 1);
1720
1721         updateTabTexts();
1722
1723         return wa;
1724 }
1725
1726
1727 bool TabWorkArea::removeWorkArea(GuiWorkArea * work_area)
1728 {
1729         LASSERT(work_area, return false);
1730         int index = indexOf(work_area);
1731         if (index == -1)
1732                 return false;
1733
1734         work_area->setUpdatesEnabled(false);
1735         removeTab(index);
1736         delete work_area;
1737
1738         if (count()) {
1739                 // make sure the next work area is enabled.
1740                 currentWidget()->setUpdatesEnabled(true);
1741                 if (currentWorkArea() && currentWorkArea()->isFullScreen())
1742                         setFullScreen(true);
1743                 else
1744                         // Show tabbar only if there's more than one tab.
1745                         showBar(count() > 1);
1746         } else
1747                 lastWorkAreaRemoved();
1748
1749         updateTabTexts();
1750
1751         return true;
1752 }
1753
1754
1755 void TabWorkArea::on_currentTabChanged(int i)
1756 {
1757         // returns e.g. on application destruction
1758         if (i == -1)
1759                 return;
1760         GuiWorkArea * wa = workArea(i);
1761         LASSERT(wa, return);
1762         wa->setUpdatesEnabled(true);
1763         wa->redraw(true);
1764         wa->setFocus();
1765         ///
1766         currentWorkAreaChanged(wa);
1767
1768         LYXERR(Debug::GUI, "currentTabChanged " << i
1769                 << " File: " << wa->bufferView().buffer().absFileName());
1770 }
1771
1772
1773 void TabWorkArea::closeCurrentBuffer()
1774 {
1775         GuiWorkArea * wa;
1776         if (clicked_tab_ == -1)
1777                 wa = currentWorkArea();
1778         else {
1779                 wa = workArea(clicked_tab_);
1780                 LASSERT(wa, return);
1781         }
1782         wa->view().closeWorkArea(wa);
1783 }
1784
1785
1786 void TabWorkArea::hideCurrentTab()
1787 {
1788         GuiWorkArea * wa;
1789         if (clicked_tab_ == -1)
1790                 wa = currentWorkArea();
1791         else {
1792                 wa = workArea(clicked_tab_);
1793                 LASSERT(wa, return);
1794         }
1795         wa->view().hideWorkArea(wa);
1796 }
1797
1798
1799 void TabWorkArea::closeTab(int index)
1800 {
1801         on_currentTabChanged(index);
1802         GuiWorkArea * wa;
1803         if (index == -1)
1804                 wa = currentWorkArea();
1805         else {
1806                 wa = workArea(index);
1807                 LASSERT(wa, return);
1808         }
1809         wa->view().closeWorkArea(wa);
1810 }
1811
1812
1813 ///
1814 class DisplayPath {
1815 public:
1816         /// make vector happy
1817         // coverity[UNINIT_CTOR]
1818         DisplayPath() {}
1819         ///
1820         DisplayPath(int tab, FileName const & filename)
1821                 : tab_(tab)
1822         {
1823                 filename_ = (filename.extension() == "lyx") ?
1824                         toqstr(filename.onlyFileNameWithoutExt())
1825                         : toqstr(filename.onlyFileName());
1826                 postfix_ = toqstr(filename.absoluteFilePath()).
1827                         split("/", QString::SkipEmptyParts);
1828                 postfix_.pop_back();
1829                 abs_ = toqstr(filename.absoluteFilePath());
1830                 dottedPrefix_ = false;
1831         }
1832
1833         /// Absolute path for debugging.
1834         QString abs() const
1835         {
1836                 return abs_;
1837         }
1838         /// Add the first segment from the postfix or three dots to the prefix.
1839         /// Merge multiple dot tripples. In fact dots are added lazily, i.e. only
1840         /// when really needed.
1841         void shiftPathSegment(bool dotted)
1842         {
1843                 if (postfix_.count() <= 0)
1844                         return;
1845
1846                 if (!dotted) {
1847                         if (dottedPrefix_ && !prefix_.isEmpty())
1848                                 prefix_ += ellipsisSlash_;
1849                         prefix_ += postfix_.front() + "/";
1850                 }
1851                 dottedPrefix_ = dotted && !prefix_.isEmpty();
1852                 postfix_.pop_front();
1853         }
1854         ///
1855         QString displayString() const
1856         {
1857                 if (prefix_.isEmpty())
1858                         return filename_;
1859
1860                 bool dots = dottedPrefix_ || !postfix_.isEmpty();
1861                 return prefix_ + (dots ? ellipsisSlash_ : "") + filename_;
1862         }
1863         ///
1864         QString forecastPathString() const
1865         {
1866                 if (postfix_.count() == 0)
1867                         return displayString();
1868
1869                 return prefix_
1870                         + (dottedPrefix_ ? ellipsisSlash_ : "")
1871                         + postfix_.front() + "/";
1872         }
1873         ///
1874         bool final() const { return postfix_.empty(); }
1875         ///
1876         int tab() const { return tab_; }
1877
1878 private:
1879         /// ".../"
1880         static QString const ellipsisSlash_;
1881         ///
1882         QString prefix_;
1883         ///
1884         QStringList postfix_;
1885         ///
1886         QString filename_;
1887         ///
1888         QString abs_;
1889         ///
1890         int tab_;
1891         ///
1892         bool dottedPrefix_;
1893 };
1894
1895
1896 QString const DisplayPath::ellipsisSlash_ = QString(QChar(0x2026)) + "/";
1897
1898
1899 ///
1900 bool operator<(DisplayPath const & a, DisplayPath const & b)
1901 {
1902         return a.displayString() < b.displayString();
1903 }
1904
1905 ///
1906 bool operator==(DisplayPath const & a, DisplayPath const & b)
1907 {
1908         return a.displayString() == b.displayString();
1909 }
1910
1911
1912 void TabWorkArea::updateTabTexts()
1913 {
1914         size_t n = count();
1915         if (n == 0)
1916                 return;
1917         std::list<DisplayPath> paths;
1918         typedef std::list<DisplayPath>::iterator It;
1919
1920         // collect full names first: path into postfix, empty prefix and
1921         // filename without extension
1922         for (size_t i = 0; i < n; ++i) {
1923                 GuiWorkArea * i_wa = workArea(i);
1924                 FileName const fn = i_wa->bufferView().buffer().fileName();
1925                 paths.push_back(DisplayPath(i, fn));
1926         }
1927
1928         // go through path segments and see if it helps to make the path more unique
1929         bool somethingChanged = true;
1930         bool allFinal = false;
1931         while (somethingChanged && !allFinal) {
1932                 // adding path segments changes order
1933                 paths.sort();
1934
1935                 LYXERR(Debug::GUI, "updateTabTexts() iteration start");
1936                 somethingChanged = false;
1937                 allFinal = true;
1938
1939                 // find segments which are not unique (i.e. non-atomic)
1940                 It it = paths.begin();
1941                 It segStart = it;
1942                 QString segString = it->displayString();
1943                 for (; it != paths.end(); ++it) {
1944                         // look to the next item
1945                         It next = it;
1946                         ++next;
1947
1948                         // final?
1949                         allFinal = allFinal && it->final();
1950
1951                         LYXERR(Debug::GUI, "it = " << it->abs()
1952                                << " => " << it->displayString());
1953
1954                         // still the same segment?
1955                         QString nextString;
1956                         if ((next != paths.end()
1957                              && (nextString = next->displayString()) == segString))
1958                                 continue;
1959                         LYXERR(Debug::GUI, "segment ended");
1960
1961                         // only a trivial one with one element?
1962                         if (it == segStart) {
1963                                 // start new segment
1964                                 segStart = next;
1965                                 segString = nextString;
1966                                 continue;
1967                         }
1968
1969                         // we found a non-atomic segment segStart <= sit <= it < next.
1970                         // Shift path segments and hope for the best
1971                         // that it makes the path more unique.
1972                         somethingChanged = true;
1973                         It sit = segStart;
1974                         // this is ok for the reason mentioned  in the previous comment.
1975                         // coverity[INVALIDATE_ITERATOR]
1976                         QString dspString = sit->forecastPathString();
1977                         LYXERR(Debug::GUI, "first forecast found for "
1978                                << sit->abs() << " => " << dspString);
1979                         ++sit;
1980                         bool moreUnique = false;
1981                         for (; sit != next; ++sit) {
1982                                 if (sit->forecastPathString() != dspString) {
1983                                         LYXERR(Debug::GUI, "different forecast found for "
1984                                                 << sit->abs() << " => " << sit->forecastPathString());
1985                                         moreUnique = true;
1986                                         break;
1987                                 }
1988                                 LYXERR(Debug::GUI, "same forecast found for "
1989                                         << sit->abs() << " => " << dspString);
1990                         }
1991
1992                         // if the path segment helped, add it. Otherwise add dots
1993                         bool dots = !moreUnique;
1994                         LYXERR(Debug::GUI, "using dots = " << dots);
1995                         for (sit = segStart; sit != next; ++sit) {
1996                                 sit->shiftPathSegment(dots);
1997                                 LYXERR(Debug::GUI, "shifting "
1998                                         << sit->abs() << " => " << sit->displayString());
1999                         }
2000
2001                         // start new segment
2002                         segStart = next;
2003                         segString = nextString;
2004                 }
2005         }
2006
2007         // set new tab titles
2008         for (It it = paths.begin(); it != paths.end(); ++it) {
2009                 int const tab_index = it->tab();
2010                 Buffer const & buf = workArea(tab_index)->bufferView().buffer();
2011                 QString tab_text = it->displayString().replace("&", "&&");
2012                 if (!buf.fileName().empty() && !buf.isClean())
2013                         tab_text += "*";
2014                 QString tab_tooltip = it->abs();
2015                 if (buf.isReadonly()) {
2016                         setTabIcon(tab_index, QIcon(getPixmap("images/", "emblem-readonly", "svgz,png")));
2017                         tab_tooltip = qt_("%1 (read only)").arg(it->abs());
2018                 } else
2019                         setTabIcon(tab_index, QIcon());
2020                 setTabText(tab_index, tab_text);
2021                 setTabToolTip(tab_index, tab_tooltip);
2022         }
2023 }
2024
2025
2026 void TabWorkArea::showContextMenu(const QPoint & pos)
2027 {
2028         // which tab?
2029         clicked_tab_ = static_cast<DragTabBar *>(tabBar())->tabAt(pos);
2030         if (clicked_tab_ == -1)
2031                 return;
2032
2033         // show tab popup
2034         QMenu popup;
2035         popup.addAction(QIcon(getPixmap("images/", "hidetab", "svgz,png")),
2036                 qt_("Hide tab"), this, SLOT(hideCurrentTab()));
2037         popup.addAction(QIcon(getPixmap("images/", "closetab", "svgz,png")),
2038                 qt_("Close tab"), this, SLOT(closeCurrentBuffer()));
2039         popup.exec(tabBar()->mapToGlobal(pos));
2040
2041         clicked_tab_ = -1;
2042 }
2043
2044
2045 void TabWorkArea::moveTab(int fromIndex, int toIndex)
2046 {
2047         QWidget * w = widget(fromIndex);
2048         QIcon icon = tabIcon(fromIndex);
2049         QString text = tabText(fromIndex);
2050
2051         setCurrentIndex(fromIndex);
2052         removeTab(fromIndex);
2053         insertTab(toIndex, w, icon, text);
2054         setCurrentIndex(toIndex);
2055 }
2056
2057
2058 DragTabBar::DragTabBar(QWidget* parent)
2059         : QTabBar(parent)
2060 {
2061         setAcceptDrops(true);
2062         setTabsClosable(!lyxrc.single_close_tab_button);
2063 }
2064
2065
2066 void DragTabBar::mousePressEvent(QMouseEvent * event)
2067 {
2068         if (event->button() == Qt::LeftButton)
2069                 dragStartPos_ = event->pos();
2070         QTabBar::mousePressEvent(event);
2071 }
2072
2073
2074 void DragTabBar::mouseMoveEvent(QMouseEvent * event)
2075 {
2076         // If the left button isn't pressed anymore then return
2077         if (!(event->buttons() & Qt::LeftButton))
2078                 return;
2079
2080         // If the distance is too small then return
2081         if ((event->pos() - dragStartPos_).manhattanLength()
2082             < QApplication::startDragDistance())
2083                 return;
2084
2085         // did we hit something after all?
2086         int tab = tabAt(dragStartPos_);
2087         if (tab == -1)
2088                 return;
2089
2090         // simulate button release to remove highlight from button
2091         int i = currentIndex();
2092         QMouseEvent me(QEvent::MouseButtonRelease, dragStartPos_,
2093                 event->button(), event->buttons(), 0);
2094         QTabBar::mouseReleaseEvent(&me);
2095         setCurrentIndex(i);
2096
2097         // initiate Drag
2098         QDrag * drag = new QDrag(this);
2099         QMimeData * mimeData = new QMimeData;
2100         // a crude way to distinguish tab-reodering drops from other ones
2101         mimeData->setData("action", "tab-reordering") ;
2102         drag->setMimeData(mimeData);
2103
2104         // get tab pixmap as cursor
2105         QRect r = tabRect(tab);
2106         QPixmap pixmap(r.size());
2107         render(&pixmap, - r.topLeft());
2108         drag->setPixmap(pixmap);
2109         drag->exec();
2110 }
2111
2112
2113 void DragTabBar::dragEnterEvent(QDragEnterEvent * event)
2114 {
2115         // Only accept if it's an tab-reordering request
2116         QMimeData const * m = event->mimeData();
2117         QStringList formats = m->formats();
2118         if (formats.contains("action")
2119             && m->data("action") == "tab-reordering")
2120                 event->acceptProposedAction();
2121 }
2122
2123
2124 void DragTabBar::dropEvent(QDropEvent * event)
2125 {
2126         int fromIndex = tabAt(dragStartPos_);
2127         int toIndex = tabAt(event->pos());
2128
2129         // Tell interested objects that
2130         if (fromIndex != toIndex)
2131                 tabMoveRequested(fromIndex, toIndex);
2132         event->acceptProposedAction();
2133 }
2134
2135
2136 } // namespace frontend
2137 } // namespace lyx
2138
2139 #include "moc_GuiWorkArea.cpp"