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
  85 int const TabIndicatorWidth = 3;
  86
  87 #undef KeyPress
  88 #undef NoModifier
  89
  90 using namespace std;
  91 using namespace lyx::support;
  92
  93 namespace lyx {
  94
  95
  96 /// return the LyX mouse button state from Qt's
  97 static mouse_button::state q_button_state(Qt::MouseButton button)
  98 {
  99         mouse_button::state b = mouse_button::none;
 100         switch (button) {
 101                 case Qt::LeftButton:
 102                         b = mouse_button::button1;
 103                         break;
 104                 case Qt::MidButton:
 105                         b = mouse_button::button2;
 106                         break;
 107                 case Qt::RightButton:
 108                         b = mouse_button::button3;
 109                         break;
 110                 default:
 111                         break;
 112         }
 113         return b;
 114 }
 115
 116
 117 /// return the LyX mouse button state from Qt's
 118 mouse_button::state q_motion_state(Qt::MouseButtons state)
 119 {
 120         mouse_button::state b = mouse_button::none;
 121         if (state & Qt::LeftButton)
 122                 b |= mouse_button::button1;
 123         if (state & Qt::MidButton)
 124                 b |= mouse_button::button2;
 125         if (state & Qt::RightButton)
 126                 b |= mouse_button::button3;
 127         return b;
 128 }
 129
 130
 131 namespace frontend {
 132
 133 class CursorWidget {
 134 public:
 135         CursorWidget() {
 136                 recomputeWidth();
 137         }
 138
 139         void draw(QPainter & painter)
 140         {
 141                 if (!show_ || !rect_.isValid())
 142                         return;
 143
 144                 int y = rect_.top();
 145                 int l = x_ - rect_.left();
 146                 int r = rect_.right() - x_;
 147                 int bot = rect_.bottom();
 148
 149                 // draw vertical line
 150                 painter.fillRect(x_, y, cursor_width_, rect_.height(), color_);
 151
 152                 // draw RTL/LTR indication
 153                 painter.setPen(color_);
 154                 if (l_shape_) {
 155                         if (rtl_)
 156                                 painter.drawLine(x_, bot, x_ - l, bot);
 157                         else
 158                                 painter.drawLine(x_, bot, x_ + cursor_width_ + r, bot);
 159                 }
 160
 161                 // draw completion triangle
 162                 if (completable_) {
 163                         int m = y + rect_.height() / 2;
 164                         int d = TabIndicatorWidth - 1;
 165                         if (rtl_) {
 166                                 painter.drawLine(x_ - 1, m - d, x_ - 1 - d, m);
 167                                 painter.drawLine(x_ - 1, m + d, x_ - 1 - d, m);
 168                         } else {
 169                                 painter.drawLine(x_ + cursor_width_, m - d, x_ + cursor_width_ + d, m);
 170                                 painter.drawLine(x_ + cursor_width_, m + d, x_ + cursor_width_ + d, m);
 171                         }
 172                 }
 173         }
 174
 175         void update(int x, int y, int h, bool l_shape,
 176                 bool rtl, bool completable)
 177         {
 178                 color_ = guiApp->colorCache().get(Color_cursor);
 179                 l_shape_ = l_shape;
 180                 rtl_ = rtl;
 181                 completable_ = completable;
 182                 x_ = x;
 183
 184                 // extension to left and right
 185                 int l = 0;
 186                 int r = 0;
 187
 188                 // RTL/LTR indication
 189                 if (l_shape_) {
 190                         if (rtl)
 191                                 l += h / 3;
 192                         else
 193                                 r += h / 3;
 194                 }
 195
 196                 // completion triangle
 197                 if (completable_) {
 198                         if (rtl)
 199                                 l = max(l, TabIndicatorWidth);
 200                         else
 201                                 r = max(r, TabIndicatorWidth);
 202                 }
 203
 204                 // compute overall rectangle
 205                 rect_ = QRect(x - l, y, cursor_width_ + r + l, h);
 206         }
 207
 208         void show(bool set_show = true) { show_ = set_show; }
 209         void hide() { show_ = false; }
 210         int cursorWidth() const { return cursor_width_; }
 211         void recomputeWidth() {
 212                 cursor_width_ = lyxrc.cursor_width
 213                         ? lyxrc.cursor_width
 214                         : 1 + int((lyxrc.zoom + 50) / 200.0);
 215         }
 216
 217         QRect const & rect() { return rect_; }
 218
 219 private:
 220         /// cursor is in RTL or LTR text
 221         bool rtl_;
 222         /// indication for RTL or LTR
 223         bool l_shape_;
 224         /// triangle to show that a completion is available
 225         bool completable_;
 226         ///
 227         bool show_;
 228         ///
 229         QColor color_;
 230         /// rectangle, possibly with l_shape and completion triangle
 231         QRect rect_;
 232         /// x position (were the vertical line is drawn)
 233         int x_;
 234
 235         int cursor_width_;
 236 };
 237
 238
 239 // This is a 'heartbeat' generating synthetic mouse move events when the
 240 // cursor is at the top or bottom edge of the viewport. One scroll per 0.2 s
 241 SyntheticMouseEvent::SyntheticMouseEvent()
 242         : timeout(200), restart_timeout(true)
 243 {}
 244
 245
 246 GuiWorkArea::Private::Private(GuiWorkArea * parent)
 247 : p(parent), screen_(0), buffer_view_(0), lyx_view_(0), cursor_visible_(false),
 248 need_resize_(false), schedule_redraw_(false), preedit_lines_(1),
 249 pixel_ratio_(1.0),
 250 completer_(new GuiCompleter(p, p))
 251 {
 252 }
 253
 254
 255 GuiWorkArea::GuiWorkArea(QWidget * /* w */)
 256 : d(new Private(this))
 257 {
 258 }
 259
 260
 261 GuiWorkArea::GuiWorkArea(Buffer & buffer, GuiView & gv)
 262 : d(new Private(this))
 263 {
 264         setGuiView(gv);
 265         buffer.params().display_pixel_ratio = theGuiApp()->pixelRatio();
 266         setBuffer(buffer);
 267         init();
 268 }
 269
 270
 271 double GuiWorkArea::pixelRatio() const
 272 {
 273 #if QT_VERSION >= 0x050000
 274         return devicePixelRatio();
 275 #else
 276         return 1.0;
 277 #endif
 278 }
 279
 280
 281 void GuiWorkArea::init()
 282 {
 283         // Setup the signals
 284         connect(&d->cursor_timeout_, SIGNAL(timeout()),
 285                 this, SLOT(toggleCursor()));
 286
 287         int const time = QApplication::cursorFlashTime() / 2;
 288         if (time > 0) {
 289                 d->cursor_timeout_.setInterval(time);
 290                 d->cursor_timeout_.start();
 291         } else {
 292                 // let's initialize this just to be safe
 293                 d->cursor_timeout_.setInterval(500);
 294         }
 295
 296         d->resetScreen();
 297         // With Qt4.5 a mouse event will happen before the first paint event
 298         // so make sure that the buffer view has an up to date metrics.
 299         d->buffer_view_->resize(viewport()->width(), viewport()->height());
 300         d->cursor_ = new frontend::CursorWidget();
 301         d->cursor_->hide();
 302
 303         setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 304         setAcceptDrops(true);
 305         setMouseTracking(true);
 306         setMinimumSize(100, 70);
 307         setFrameStyle(QFrame::NoFrame);
 308         updateWindowTitle();
 309
 310         viewport()->setAutoFillBackground(false);
 311         // We don't need double-buffering nor SystemBackground on
 312         // the viewport because we have our own backing pixmap.
 313         viewport()->setAttribute(Qt::WA_NoSystemBackground);
 314
 315         setFocusPolicy(Qt::StrongFocus);
 316
 317         d->setCursorShape(Qt::IBeamCursor);
 318
 319         d->synthetic_mouse_event_.timeout.timeout.connect(
 320                 bind(&GuiWorkArea::generateSyntheticMouseEvent,
 321                                         this));
 322
 323         // Initialize the vertical Scroll Bar
 324         QObject::connect(verticalScrollBar(), SIGNAL(valueChanged(int)),
 325                 this, SLOT(scrollTo(int)));
 326
 327         LYXERR(Debug::GUI, "viewport width: " << viewport()->width()
 328                 << "  viewport height: " << viewport()->height());
 329
 330         // Enables input methods for asian languages.
 331         // Must be set when creating custom text editing widgets.
 332         setAttribute(Qt::WA_InputMethodEnabled, true);
 333
 334         d->dialog_mode_ = false;
 335 }
 336
 337
 338 GuiWorkArea::~GuiWorkArea()
 339 {
 340         d->buffer_view_->buffer().workAreaManager().remove(this);
 341         delete d->screen_;
 342         delete d->buffer_view_;
 343         delete d->cursor_;
 344         // Completer has a QObject parent and is thus automatically destroyed.
 345         // See #4758.
 346         // delete completer_;
 347         delete d;
 348 }
 349
 350
 351 Qt::CursorShape GuiWorkArea::cursorShape() const
 352 {
 353         return viewport()->cursor().shape();
 354 }
 355
 356
 357 void GuiWorkArea::Private::setCursorShape(Qt::CursorShape shape)
 358 {
 359         p->viewport()->setCursor(shape);
 360 }
 361
 362
 363 void GuiWorkArea::Private::updateCursorShape()
 364 {
 365         setCursorShape(buffer_view_->clickableInset()
 366                 ? Qt::PointingHandCursor : Qt::IBeamCursor);
 367 }
 368
 369
 370 void GuiWorkArea::setGuiView(GuiView & gv)
 371 {
 372         d->lyx_view_ = &gv;
 373 }
 374
 375
 376 void GuiWorkArea::setBuffer(Buffer & buffer)
 377 {
 378         delete d->buffer_view_;
 379         d->buffer_view_ = new BufferView(buffer);
 380         buffer.workAreaManager().add(this);
 381
 382         // HACK: Prevents an additional redraw when the scrollbar pops up
 383         // which regularily happens on documents with more than one page.
 384         // The policy  should be set to "Qt::ScrollBarAsNeeded" soon.
 385         // Since we have no geometry information yet, we assume that
 386         // a document needs a scrollbar if there is more then four
 387         // paragraph in the outermost text.
 388         if (buffer.text().paragraphs().size() > 4)
 389                 setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
 390         QTimer::singleShot(50, this, SLOT(fixVerticalScrollBar()));
 391 }
 392
 393
 394 void GuiWorkArea::fixVerticalScrollBar()
 395 {
 396         if (!isFullScreen())
 397                 setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
 398 }
 399
 400
 401 void GuiWorkArea::close()
 402 {
 403         d->lyx_view_->removeWorkArea(this);
 404 }
 405
 406
 407 void GuiWorkArea::setFullScreen(bool full_screen)
 408 {
 409         d->buffer_view_->setFullScreen(full_screen);
 410         setFrameStyle(QFrame::NoFrame);
 411         if (full_screen) {
 412                 setFrameStyle(QFrame::NoFrame);
 413                 if (lyxrc.full_screen_scrollbar)
 414                         setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 415         } else
 416                 setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
 417 }
 418
 419
 420 BufferView & GuiWorkArea::bufferView()
 421 {
 422         return *d->buffer_view_;
 423 }
 424
 425
 426 BufferView const & GuiWorkArea::bufferView() const
 427 {
 428         return *d->buffer_view_;
 429 }
 430
 431
 432 void GuiWorkArea::stopBlinkingCursor()
 433 {
 434         d->cursor_timeout_.stop();
 435         d->hideCursor();
 436 }
 437
 438
 439 void GuiWorkArea::startBlinkingCursor()
 440 {
 441         // do not show the cursor if the view is busy
 442         if (view().busy())
 443                 return;
 444
 445         Point p;
 446         int h = 0;
 447         d->buffer_view_->cursorPosAndHeight(p, h);
 448         // Don't start blinking if the cursor isn't on screen.
 449         if (!d->buffer_view_->cursorInView(p, h))
 450                 return;
 451
 452         d->showCursor();
 453
 454         //we're not supposed to cache this value.
 455         int const time = QApplication::cursorFlashTime() / 2;
 456         if (time <= 0)
 457                 return;
 458         d->cursor_timeout_.setInterval(time);
 459         d->cursor_timeout_.start();
 460 }
 461
 462
 463 void GuiWorkArea::redraw(bool update_metrics)
 464 {
 465         if (!isVisible())
 466                 // No need to redraw in this case.
 467                 return;
 468
 469         // No need to do anything if this is the current view. The BufferView
 470         // metrics are already up to date.
 471         if (update_metrics || d->lyx_view_ != guiApp->currentView()
 472                 || d->lyx_view_->currentWorkArea() != this) {
 473                 // FIXME: it would be nice to optimize for the off-screen case.
 474                 d->buffer_view_->cursor().fixIfBroken();
 475                 d->buffer_view_->updateMetrics();
 476                 d->buffer_view_->cursor().fixIfBroken();
 477         }
 478
 479         // update cursor position, because otherwise it has to wait until
 480         // the blinking interval is over
 481         if (d->cursor_visible_) {
 482                 d->hideCursor();
 483                 d->showCursor();
 484         }
 485
 486         LYXERR(Debug::WORKAREA, "WorkArea::redraw screen");
 487         d->updateScreen();
 488         update(0, 0, viewport()->width(), viewport()->height());
 489
 490         /// \warning: scrollbar updating *must* be done after the BufferView is drawn
 491         /// because \c BufferView::updateScrollbar() is called in \c BufferView::draw().
 492         d->updateScrollbar();
 493         d->lyx_view_->updateStatusBar();
 494
 495         if (lyxerr.debugging(Debug::WORKAREA))
 496                 d->buffer_view_->coordCache().dump();
 497
 498         updateWindowTitle();
 499
 500         d->updateCursorShape();
 501 }
 502
 503
 504 void GuiWorkArea::processKeySym(KeySymbol const & key, KeyModifier mod)
 505 {
 506         if (d->lyx_view_->isFullScreen() && d->lyx_view_->menuBar()->isVisible()
 507                 && lyxrc.full_screen_menubar) {
 508                 // FIXME HACK: we should not have to do this here. See related comment
 509                 // in GuiView::event() (QEvent::ShortcutOverride)
 510                 d->lyx_view_->menuBar()->hide();
 511         }
 512
 513         // In order to avoid bad surprise in the middle of an operation,
 514         // we better stop the blinking cursor...
 515         // the cursor gets restarted in GuiView::restartCursor()
 516         stopBlinkingCursor();
 517         guiApp->processKeySym(key, mod);
 518 }
 519
 520
 521 void GuiWorkArea::Private::dispatch(FuncRequest const & cmd0, KeyModifier mod)
 522 {
 523         // Handle drag&drop
 524         if (cmd0.action() == LFUN_FILE_OPEN) {
 525                 DispatchResult dr;
 526                 lyx_view_->dispatch(cmd0, dr);
 527                 return;
 528         }
 529
 530         FuncRequest cmd;
 531
 532         if (cmd0.action() == LFUN_MOUSE_PRESS) {
 533                 if (mod == ShiftModifier)
 534                         cmd = FuncRequest(cmd0, "region-select");
 535                 else if (mod == ControlModifier)
 536                         cmd = FuncRequest(cmd0, "paragraph-select");
 537                 else
 538                         cmd = cmd0;
 539         }
 540         else
 541                 cmd = cmd0;
 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         showCursor(p.x_, p.y_, h, l_shape, isrtl, completable);
 644 }
 645
 646
 647 void GuiWorkArea::Private::hideCursor()
 648 {
 649         if (!cursor_visible_)
 650                 return;
 651
 652         cursor_visible_ = false;
 653         removeCursor();
 654 }
 655
 656
 657 void GuiWorkArea::toggleCursor()
 658 {
 659         if (d->cursor_visible_)
 660                 d->hideCursor();
 661         else
 662                 d->showCursor();
 663 }
 664
 665
 666 void GuiWorkArea::Private::updateScrollbar()
 667 {
 668         ScrollbarParameters const & scroll_ = buffer_view_->scrollbarParameters();
 669         // WARNING: don't touch at the scrollbar value like this:
 670         //   verticalScrollBar()->setValue(scroll_.position);
 671         // because this would cause a recursive signal/slot calling with
 672         // GuiWorkArea::scrollTo
 673         p->verticalScrollBar()->setRange(scroll_.min, scroll_.max);
 674         p->verticalScrollBar()->setPageStep(scroll_.page_step);
 675         p->verticalScrollBar()->setSingleStep(scroll_.single_step);
 676         p->verticalScrollBar()->setSliderPosition(scroll_.position);
 677 }
 678
 679
 680 void GuiWorkArea::scrollTo(int value)
 681 {
 682         stopBlinkingCursor();
 683         d->buffer_view_->scrollDocView(value, true);
 684
 685         if (lyxrc.cursor_follows_scrollbar) {
 686                 d->buffer_view_->setCursorFromScrollbar();
 687                 // FIXME: let GuiView take care of those.
 688                 d->lyx_view_->updateLayoutList();
 689         }
 690         // Show the cursor immediately after any operation.
 691         startBlinkingCursor();
 692 #ifdef Q_WS_X11
 693         QApplication::syncX();
 694 #endif
 695 }
 696
 697
 698 bool GuiWorkArea::event(QEvent * e)
 699 {
 700         switch (e->type()) {
 701         case QEvent::ToolTip: {
 702                 QHelpEvent * helpEvent = static_cast<QHelpEvent *>(e);
 703                 if (lyxrc.use_tooltip) {
 704                         QPoint pos = helpEvent->pos();
 705                         if (pos.x() < viewport()->width()) {
 706                                 QString s = toqstr(d->buffer_view_->toolTip(pos.x(), pos.y()));
 707                                 QToolTip::showText(helpEvent->globalPos(), s);
 708                         }
 709                         else
 710                                 QToolTip::hideText();
 711                 }
 712                 // Don't forget to accept the event!
 713                 e->accept();
 714                 return true;
 715         }
 716
 717         case QEvent::ShortcutOverride: {
 718                 // We catch this event in order to catch the Tab or Shift+Tab key press
 719                 // which are otherwise reserved to focus switching between controls
 720                 // within a dialog.
 721                 QKeyEvent * ke = static_cast<QKeyEvent*>(e);
 722                 if ((ke->key() == Qt::Key_Tab && ke->modifiers() == Qt::NoModifier)
 723                         || (ke->key() == Qt::Key_Backtab && (
 724                                 ke->modifiers() == Qt::ShiftModifier
 725                                 || ke->modifiers() == Qt::NoModifier))) {
 726                         keyPressEvent(ke);
 727                         return true;
 728                 }
 729                 return QAbstractScrollArea::event(e);
 730         }
 731
 732         default:
 733                 return QAbstractScrollArea::event(e);
 734         }
 735         return false;
 736 }
 737
 738
 739 void GuiWorkArea::contextMenuEvent(QContextMenuEvent * e)
 740 {
 741         string name;
 742         if (e->reason() == QContextMenuEvent::Mouse)
 743                 // the menu name is set on mouse press
 744                 name = d->context_menu_name_;
 745         else {
 746                 QPoint pos = e->pos();
 747                 Cursor const & cur = d->buffer_view_->cursor();
 748                 if (e->reason() == QContextMenuEvent::Keyboard && cur.inTexted()) {
 749                         // Do not access the context menu of math right in front of before
 750                         // the cursor. This does not work when the cursor is in text.
 751                         Inset * inset = cur.paragraph().getInset(cur.pos());
 752                         if (inset && inset->asInsetMath())
 753                                 --pos.rx();
 754                         else if (cur.pos() > 0) {
 755                                 Inset * inset = cur.paragraph().getInset(cur.pos() - 1);
 756                                 if (inset)
 757                                         ++pos.rx();
 758                         }
 759                 }
 760                 name = d->buffer_view_->contextMenu(pos.x(), pos.y());
 761         }
 762
 763         if (name.empty()) {
 764                 QAbstractScrollArea::contextMenuEvent(e);
 765                 return;
 766         }
 767         // always show mnemonics when the keyboard is used to show the context menu
 768         // FIXME: This should be fixed in Qt itself
 769         bool const keyboard = (e->reason() == QContextMenuEvent::Keyboard);
 770         QMenu * menu = guiApp->menus().menu(toqstr(name), *d->lyx_view_, keyboard);
 771         if (!menu) {
 772                 QAbstractScrollArea::contextMenuEvent(e);
 773                 return;
 774         }
 775         // Position the menu to the right.
 776         // FIXME: menu position should be different for RTL text.
 777         menu->exec(e->globalPos());
 778         e->accept();
 779 }
 780
 781
 782 void GuiWorkArea::focusInEvent(QFocusEvent * e)
 783 {
 784         LYXERR(Debug::DEBUG, "GuiWorkArea::focusInEvent(): " << this << endl);
 785         if (d->lyx_view_->currentWorkArea() != this) {
 786                 d->lyx_view_->setCurrentWorkArea(this);
 787                 d->lyx_view_->currentWorkArea()->bufferView().buffer().updateBuffer();
 788         }
 789
 790         startBlinkingCursor();
 791         QAbstractScrollArea::focusInEvent(e);
 792 }
 793
 794
 795 void GuiWorkArea::focusOutEvent(QFocusEvent * e)
 796 {
 797         LYXERR(Debug::DEBUG, "GuiWorkArea::focusOutEvent(): " << this << endl);
 798         stopBlinkingCursor();
 799         QAbstractScrollArea::focusOutEvent(e);
 800 }
 801
 802
 803 void GuiWorkArea::mousePressEvent(QMouseEvent * e)
 804 {
 805         if (d->dc_event_.active && d->dc_event_ == *e) {
 806                 d->dc_event_.active = false;
 807                 FuncRequest cmd(LFUN_MOUSE_TRIPLE, e->x(), e->y(),
 808                         q_button_state(e->button()));
 809                 d->dispatch(cmd);
 810                 e->accept();
 811                 return;
 812         }
 813
 814 #if (QT_VERSION < 0x050000)
 815         inputContext()->reset();
 816 #endif
 817
 818         FuncRequest const cmd(LFUN_MOUSE_PRESS, e->x(), e->y(),
 819                 q_button_state(e->button()));
 820         d->dispatch(cmd, q_key_state(e->modifiers()));
 821
 822         // Save the context menu on mouse press, because also the mouse
 823         // cursor is set on mouse press. Afterwards, we can either release
 824         // the mousebutton somewhere else, or the cursor might have moved
 825         // due to the DEPM. We need to do this after the mouse has been
 826         // set in dispatch(), because the selection state might change.
 827         if (e->button() == Qt::RightButton)
 828                 d->context_menu_name_ = d->buffer_view_->contextMenu(e->x(), e->y());
 829
 830         e->accept();
 831 }
 832
 833
 834 void GuiWorkArea::mouseReleaseEvent(QMouseEvent * e)
 835 {
 836         if (d->synthetic_mouse_event_.timeout.running())
 837                 d->synthetic_mouse_event_.timeout.stop();
 838
 839         FuncRequest const cmd(LFUN_MOUSE_RELEASE, e->x(), e->y(),
 840                               q_button_state(e->button()));
 841         d->dispatch(cmd);
 842         e->accept();
 843 }
 844
 845
 846 void GuiWorkArea::mouseMoveEvent(QMouseEvent * e)
 847 {
 848         // we kill the triple click if we move
 849         doubleClickTimeout();
 850         FuncRequest cmd(LFUN_MOUSE_MOTION, e->x(), e->y(),
 851                 q_motion_state(e->buttons()));
 852
 853         e->accept();
 854
 855         // If we're above or below the work area...
 856         if ((e->y() <= 20 || e->y() >= viewport()->height() - 20)
 857                         && e->buttons() == mouse_button::button1) {
 858                 // Make sure only a synthetic event can cause a page scroll,
 859                 // so they come at a steady rate:
 860                 if (e->y() <= 20)
 861                         // _Force_ a scroll up:
 862                         cmd.set_y(e->y() - 21);
 863                 else
 864                         cmd.set_y(e->y() + 21);
 865                 // Store the event, to be handled when the timeout expires.
 866                 d->synthetic_mouse_event_.cmd = cmd;
 867
 868                 if (d->synthetic_mouse_event_.timeout.running()) {
 869                         // Discard the event. Note that it _may_ be handled
 870                         // when the timeout expires if
 871                         // synthetic_mouse_event_.cmd has not been overwritten.
 872                         // Ie, when the timeout expires, we handle the
 873                         // most recent event but discard all others that
 874                         // occurred after the one used to start the timeout
 875                         // in the first place.
 876                         return;
 877                 }
 878
 879                 d->synthetic_mouse_event_.restart_timeout = true;
 880                 d->synthetic_mouse_event_.timeout.start();
 881                 // Fall through to handle this event...
 882
 883         } else if (d->synthetic_mouse_event_.timeout.running()) {
 884                 // Store the event, to be possibly handled when the timeout
 885                 // expires.
 886                 // Once the timeout has expired, normal control is returned
 887                 // to mouseMoveEvent (restart_timeout = false).
 888                 // This results in a much smoother 'feel' when moving the
 889                 // mouse back into the work area.
 890                 d->synthetic_mouse_event_.cmd = cmd;
 891                 d->synthetic_mouse_event_.restart_timeout = false;
 892                 return;
 893         }
 894         d->dispatch(cmd);
 895 }
 896
 897
 898 void GuiWorkArea::wheelEvent(QWheelEvent * ev)
 899 {
 900         // Wheel rotation by one notch results in a delta() of 120 (see
 901         // documentation of QWheelEvent)
 902         double const delta = ev->delta() / 120.0;
 903         bool zoom = false;
 904         switch (lyxrc.scroll_wheel_zoom) {
 905         case LyXRC::SCROLL_WHEEL_ZOOM_CTRL:
 906                 zoom = ev->modifiers() & Qt::ControlModifier;
 907                 zoom &= !(ev->modifiers() & (Qt::ShiftModifier | Qt::AltModifier));
 908                 break;
 909         case LyXRC::SCROLL_WHEEL_ZOOM_SHIFT:
 910                 zoom = ev->modifiers() & Qt::ShiftModifier;
 911                 zoom &= !(ev->modifiers() & (Qt::ControlModifier | Qt::AltModifier));
 912                 break;
 913         case LyXRC::SCROLL_WHEEL_ZOOM_ALT:
 914                 zoom = ev->modifiers() & Qt::AltModifier;
 915                 zoom &= !(ev->modifiers() & (Qt::ShiftModifier | Qt::ControlModifier));
 916                 break;
 917         case LyXRC::SCROLL_WHEEL_ZOOM_OFF:
 918                 break;
 919         }
 920         if (zoom) {
 921                 docstring arg = convert<docstring>(int(5 * delta));
 922                 lyx::dispatch(FuncRequest(LFUN_BUFFER_ZOOM_IN, arg));
 923                 return;
 924         }
 925
 926         // Take into account the desktop wide settings.
 927         int const lines = qApp->wheelScrollLines();
 928         int const page_step = verticalScrollBar()->pageStep();
 929         // Test if the wheel mouse is set to one screen at a time.
 930         int scroll_value = lines > page_step
 931                 ? page_step : lines * verticalScrollBar()->singleStep();
 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 #ifdef Q_WS_X11
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,
1112                         ev->x(), ev->y(),
1113                         q_button_state(ev->button()));
1114         d->dispatch(cmd);
1115         ev->accept();
1116 }
1117
1118
1119 void GuiWorkArea::resizeEvent(QResizeEvent * ev)
1120 {
1121         QAbstractScrollArea::resizeEvent(ev);
1122         d->need_resize_ = true;
1123         ev->accept();
1124 }
1125
1126
1127 void GuiWorkArea::Private::update(int x, int y, int w, int h)
1128 {
1129         p->viewport()->update(x, y, w, h);
1130 }
1131
1132
1133 void GuiWorkArea::paintEvent(QPaintEvent * ev)
1134 {
1135         QRectF const rc = ev->rect();
1136         // LYXERR(Debug::PAINTING, "paintEvent begin: x: " << rc.x()
1137         //      << " y: " << rc.y() << " w: " << rc.width() << " h: " << rc.height());
1138
1139         if (d->needResize()) {
1140                 d->resetScreen();
1141                 d->resizeBufferView();
1142                 if (d->cursor_visible_) {
1143                         d->hideCursor();
1144                         d->showCursor();
1145                 }
1146         }
1147
1148         QPainter pain(viewport());
1149         double const pr = pixelRatio();
1150         QRectF const rcs = QRectF(rc.x() * pr, rc.y() * pr, rc.width() * pr, rc.height() * pr);
1151
1152         if (lyxrc.use_qimage) {
1153                 QImage const & image = static_cast<QImage const &>(*d->screen_);
1154                 pain.drawImage(rc, image, rcs);
1155         } else {
1156                 QPixmap const & pixmap = static_cast<QPixmap const &>(*d->screen_);
1157                 pain.drawPixmap(rc, pixmap, rcs);
1158         }
1159         d->cursor_->draw(pain);
1160         ev->accept();
1161 }
1162
1163
1164 void GuiWorkArea::Private::updateScreen()
1165 {
1166         GuiPainter pain(screen_, p->pixelRatio());
1167         buffer_view_->draw(pain);
1168 }
1169
1170
1171 void GuiWorkArea::Private::showCursor(int x, int y, int h,
1172         bool l_shape, bool rtl, bool completable)
1173 {
1174         if (schedule_redraw_) {
1175                 // This happens when a graphic conversion is finished. As we don't know
1176                 // the size of the new graphics, it's better the update everything.
1177                 // We can't use redraw() here because this would trigger a infinite
1178                 // recursive loop with showCursor().
1179                 buffer_view_->resize(p->viewport()->width(), p->viewport()->height());
1180                 updateScreen();
1181                 updateScrollbar();
1182                 p->viewport()->update(QRect(0, 0, p->viewport()->width(), p->viewport()->height()));
1183                 schedule_redraw_ = false;
1184                 // Show the cursor immediately after the update.
1185                 hideCursor();
1186                 p->toggleCursor();
1187                 return;
1188         }
1189
1190         cursor_->update(x, y, h, l_shape, rtl, completable);
1191         cursor_->show();
1192         p->viewport()->update(cursor_->rect());
1193 }
1194
1195
1196 void GuiWorkArea::Private::removeCursor()
1197 {
1198         cursor_->hide();
1199         //if (!qApp->focusWidget())
1200                 p->viewport()->update(cursor_->rect());
1201 }
1202
1203
1204 void GuiWorkArea::inputMethodEvent(QInputMethodEvent * e)
1205 {
1206         QString const & commit_string = e->commitString();
1207         docstring const & preedit_string
1208                 = qstring_to_ucs4(e->preeditString());
1209
1210         if (!commit_string.isEmpty()) {
1211
1212                 LYXERR(Debug::KEY, "preeditString: " << e->preeditString()
1213                         << " commitString: " << e->commitString());
1214
1215                 int key = 0;
1216
1217                 // FIXME Iwami 04/01/07: we should take care also of UTF16 surrogates here.
1218                 for (int i = 0; i != commit_string.size(); ++i) {
1219                         QKeyEvent ev(QEvent::KeyPress, key, Qt::NoModifier, commit_string[i]);
1220                         keyPressEvent(&ev);
1221                 }
1222         }
1223
1224         // Hide the cursor during the kana-kanji transformation.
1225         if (preedit_string.empty())
1226                 startBlinkingCursor();
1227         else
1228                 stopBlinkingCursor();
1229
1230         // last_width : for checking if last preedit string was/wasn't empty.
1231         // FIXME THREAD
1232         // We could have more than one work area, right?
1233         static bool last_width = false;
1234         if (!last_width && preedit_string.empty()) {
1235                 // if last_width is last length of preedit string.
1236                 e->accept();
1237                 return;
1238         }
1239
1240         GuiPainter pain(d->screen_, pixelRatio());
1241         d->buffer_view_->updateMetrics();
1242         d->buffer_view_->draw(pain);
1243         FontInfo font = d->buffer_view_->cursor().getFont().fontInfo();
1244         FontMetrics const & fm = theFontMetrics(font);
1245         int height = fm.maxHeight();
1246         int cur_x = d->cursor_->rect().left();
1247         int cur_y = d->cursor_->rect().bottom();
1248
1249         // redraw area of preedit string.
1250         update(0, cur_y - height, viewport()->width(),
1251                 (height + 1) * d->preedit_lines_);
1252
1253         if (preedit_string.empty()) {
1254                 last_width = false;
1255                 d->preedit_lines_ = 1;
1256                 e->accept();
1257                 return;
1258         }
1259         last_width = true;
1260
1261         // att : stores an IM attribute.
1262         QList<QInputMethodEvent::Attribute> const & att = e->attributes();
1263
1264         // get attributes of input method cursor.
1265         // cursor_pos : cursor position in preedit string.
1266         size_t cursor_pos = 0;
1267         bool cursor_is_visible = false;
1268         for (int i = 0; i != att.size(); ++i) {
1269                 if (att.at(i).type == QInputMethodEvent::Cursor) {
1270                         cursor_pos = att.at(i).start;
1271                         cursor_is_visible = att.at(i).length != 0;
1272                         break;
1273                 }
1274         }
1275
1276         size_t preedit_length = preedit_string.length();
1277
1278         // get position of selection in input method.
1279         // FIXME: isn't there a way to do this simplier?
1280         // rStart : cursor position in selected string in IM.
1281         size_t rStart = 0;
1282         // rLength : selected string length in IM.
1283         size_t rLength = 0;
1284         if (cursor_pos < preedit_length) {
1285                 for (int i = 0; i != att.size(); ++i) {
1286                         if (att.at(i).type == QInputMethodEvent::TextFormat) {
1287                                 if (att.at(i).start <= int(cursor_pos)
1288                                         && int(cursor_pos) < att.at(i).start + att.at(i).length) {
1289                                                 rStart = att.at(i).start;
1290                                                 rLength = att.at(i).length;
1291                                                 if (!cursor_is_visible)
1292                                                         cursor_pos += rLength;
1293                                                 break;
1294                                 }
1295                         }
1296                 }
1297         }
1298         else {
1299                 rStart = cursor_pos;
1300                 rLength = 0;
1301         }
1302
1303         int const right_margin = d->buffer_view_->rightMargin();
1304         Painter::preedit_style ps;
1305         // Most often there would be only one line:
1306         d->preedit_lines_ = 1;
1307         for (size_t pos = 0; pos != preedit_length; ++pos) {
1308                 char_type const typed_char = preedit_string[pos];
1309                 // reset preedit string style
1310                 ps = Painter::preedit_default;
1311
1312                 // if we reached the right extremity of the screen, go to next line.
1313                 if (cur_x + fm.width(typed_char) > viewport()->width() - right_margin) {
1314                         cur_x = right_margin;
1315                         cur_y += height + 1;
1316                         ++d->preedit_lines_;
1317                 }
1318                 // preedit strings are displayed with dashed underline
1319                 // and partial strings are displayed white on black indicating
1320                 // that we are in selecting mode in the input method.
1321                 // FIXME: rLength == preedit_length is not a changing condition
1322                 // FIXME: should be put out of the loop.
1323                 if (pos >= rStart
1324                         && pos < rStart + rLength
1325                         && !(cursor_pos < rLength && rLength == preedit_length))
1326                         ps = Painter::preedit_selecting;
1327
1328                 if (pos == cursor_pos
1329                         && (cursor_pos < rLength && rLength == preedit_length))
1330                         ps = Painter::preedit_cursor;
1331
1332                 // draw one character and update cur_x.
1333                 cur_x += pain.preeditText(cur_x, cur_y, typed_char, font, ps);
1334         }
1335
1336         // update the preedit string screen area.
1337         update(0, cur_y - d->preedit_lines_*height, viewport()->width(),
1338                 (height + 1) * d->preedit_lines_);
1339
1340         // Don't forget to accept the event!
1341         e->accept();
1342 }
1343
1344
1345 QVariant GuiWorkArea::inputMethodQuery(Qt::InputMethodQuery query) const
1346 {
1347         QRect cur_r(0, 0, 0, 0);
1348         switch (query) {
1349                 // this is the CJK-specific composition window position and
1350                 // the context menu position when the menu key is pressed.
1351                 case Qt::ImMicroFocus:
1352                         cur_r = d->cursor_->rect();
1353                         if (d->preedit_lines_ != 1)
1354                                 cur_r.moveLeft(10);
1355                         cur_r.moveBottom(cur_r.bottom()
1356                                 + cur_r.height() * (d->preedit_lines_ - 1));
1357                         // return lower right of cursor in LyX.
1358                         return cur_r;
1359                 default:
1360                         return QWidget::inputMethodQuery(query);
1361         }
1362 }
1363
1364
1365 void GuiWorkArea::updateWindowTitle()
1366 {
1367         docstring maximize_title;
1368         docstring minimize_title;
1369
1370         Buffer const & buf = d->buffer_view_->buffer();
1371         FileName const file_name = buf.fileName();
1372         if (!file_name.empty()) {
1373                 maximize_title = file_name.displayName(130);
1374                 minimize_title = from_utf8(file_name.onlyFileName());
1375                 if (buf.lyxvc().inUse()) {
1376                         if (buf.lyxvc().locking())
1377                                 maximize_title +=  _(" (version control, locking)");
1378                         else
1379                                 maximize_title +=  _(" (version control)");
1380                 }
1381                 if (!buf.isClean()) {
1382                         maximize_title += _(" (changed)");
1383                         minimize_title += char_type('*');
1384                 }
1385                 if (buf.isReadonly())
1386                         maximize_title += _(" (read only)");
1387         }
1388
1389         QString const new_title = toqstr(maximize_title);
1390         if (new_title != windowTitle()) {
1391                 QWidget::setWindowTitle(new_title);
1392                 QWidget::setWindowIconText(toqstr(minimize_title));
1393                 titleChanged(this);
1394         }
1395 }
1396
1397
1398 bool GuiWorkArea::isFullScreen() const
1399 {
1400         return d->lyx_view_ && d->lyx_view_->isFullScreen();
1401 }
1402
1403
1404 void GuiWorkArea::scheduleRedraw()
1405 {
1406         d->schedule_redraw_ = true;
1407 }
1408
1409
1410 bool GuiWorkArea::inDialogMode() const
1411 {
1412         return d->dialog_mode_;
1413 }
1414
1415
1416 void GuiWorkArea::setDialogMode(bool mode)
1417 {
1418         d->dialog_mode_ = mode;
1419 }
1420
1421
1422 GuiCompleter & GuiWorkArea::completer()
1423 {
1424         return *d->completer_;
1425 }
1426
1427 GuiView const & GuiWorkArea::view() const
1428 {
1429         return *d->lyx_view_;
1430 }
1431
1432
1433 GuiView & GuiWorkArea::view()
1434 {
1435         return *d->lyx_view_;
1436 }
1437
1438 ////////////////////////////////////////////////////////////////////
1439 //
1440 // EmbeddedWorkArea
1441 //
1442 ////////////////////////////////////////////////////////////////////
1443
1444
1445 EmbeddedWorkArea::EmbeddedWorkArea(QWidget * w): GuiWorkArea(w)
1446 {
1447         support::TempFile tempfile("embedded.internal");
1448         tempfile.setAutoRemove(false);
1449         buffer_ = theBufferList().newInternalBuffer(tempfile.name().absFileName());
1450         buffer_->setUnnamed(true);
1451         buffer_->setFullyLoaded(true);
1452         setBuffer(*buffer_);
1453         setDialogMode(true);
1454 }
1455
1456
1457 EmbeddedWorkArea::~EmbeddedWorkArea()
1458 {
1459         // No need to destroy buffer and bufferview here, because it is done
1460         // in theBufferList() destruction loop at application exit
1461 }
1462
1463
1464 void EmbeddedWorkArea::closeEvent(QCloseEvent * ev)
1465 {
1466         disable();
1467         GuiWorkArea::closeEvent(ev);
1468 }
1469
1470
1471 void EmbeddedWorkArea::hideEvent(QHideEvent * ev)
1472 {
1473         disable();
1474         GuiWorkArea::hideEvent(ev);
1475 }
1476
1477
1478 QSize EmbeddedWorkArea::sizeHint () const
1479 {
1480         // FIXME(?):
1481         // GuiWorkArea sets the size to the screen's viewport
1482         // by returning a value this gets overridden
1483         // EmbeddedWorkArea is now sized to fit in the layout
1484         // of the parent, and has a minimum size set in GuiWorkArea
1485         // which is what we return here
1486         return QSize(100, 70);
1487 }
1488
1489
1490 void EmbeddedWorkArea::disable()
1491 {
1492         stopBlinkingCursor();
1493         if (view().currentWorkArea() != this)
1494                 return;
1495         // No problem if currentMainWorkArea() is 0 (setCurrentWorkArea()
1496         // tolerates it and shows the background logo), what happens if
1497         // an EmbeddedWorkArea is closed after closing all document WAs
1498         view().setCurrentWorkArea(view().currentMainWorkArea());
1499 }
1500
1501 ////////////////////////////////////////////////////////////////////
1502 //
1503 // TabWorkArea
1504 //
1505 ////////////////////////////////////////////////////////////////////
1506
1507 #ifdef Q_OS_MAC
1508 class NoTabFrameMacStyle : public QProxyStyle {
1509 public:
1510         ///
1511         QRect subElementRect(SubElement element, const QStyleOption * option,
1512                              const QWidget * widget = 0) const
1513         {
1514                 QRect rect = QProxyStyle::subElementRect(element, option, widget);
1515                 bool noBar = static_cast<QTabWidget const *>(widget)->count() <= 1;
1516
1517                 // The Qt Mac style puts the contents into a 3 pixel wide box
1518                 // which looks very ugly and not like other Mac applications.
1519                 // Hence we remove this here, and moreover the 16 pixel round
1520                 // frame above if the tab bar is hidden.
1521                 if (element == QStyle::SE_TabWidgetTabContents) {
1522                         rect.adjust(- rect.left(), 0, rect.left(), 0);
1523                         if (noBar)
1524                                 rect.setTop(0);
1525                 }
1526
1527                 return rect;
1528         }
1529 };
1530
1531 NoTabFrameMacStyle noTabFrameMacStyle;
1532 #endif
1533
1534
1535 TabWorkArea::TabWorkArea(QWidget * parent)
1536         : QTabWidget(parent), clicked_tab_(-1)
1537 {
1538 #ifdef Q_OS_MAC
1539         setStyle(&noTabFrameMacStyle);
1540 #endif
1541
1542         QPalette pal = palette();
1543         pal.setColor(QPalette::Active, QPalette::Button,
1544                 pal.color(QPalette::Active, QPalette::Window));
1545         pal.setColor(QPalette::Disabled, QPalette::Button,
1546                 pal.color(QPalette::Disabled, QPalette::Window));
1547         pal.setColor(QPalette::Inactive, QPalette::Button,
1548                 pal.color(QPalette::Inactive, QPalette::Window));
1549
1550         QObject::connect(this, SIGNAL(currentChanged(int)),
1551                 this, SLOT(on_currentTabChanged(int)));
1552
1553         closeBufferButton = new QToolButton(this);
1554         closeBufferButton->setPalette(pal);
1555         // FIXME: rename the icon to closebuffer.png
1556         closeBufferButton->setIcon(QIcon(getPixmap("images/", "closetab", "png")));
1557         closeBufferButton->setText("Close File");
1558         closeBufferButton->setAutoRaise(true);
1559         closeBufferButton->setCursor(Qt::ArrowCursor);
1560         closeBufferButton->setToolTip(qt_("Close File"));
1561         closeBufferButton->setEnabled(true);
1562         QObject::connect(closeBufferButton, SIGNAL(clicked()),
1563                 this, SLOT(closeCurrentBuffer()));
1564         setCornerWidget(closeBufferButton, Qt::TopRightCorner);
1565
1566         // setup drag'n'drop
1567         QTabBar* tb = new DragTabBar;
1568         connect(tb, SIGNAL(tabMoveRequested(int, int)),
1569                 this, SLOT(moveTab(int, int)));
1570         tb->setElideMode(Qt::ElideNone);
1571         setTabBar(tb);
1572
1573         // make us responsible for the context menu of the tabbar
1574         tb->setContextMenuPolicy(Qt::CustomContextMenu);
1575         connect(tb, SIGNAL(customContextMenuRequested(const QPoint &)),
1576                 this, SLOT(showContextMenu(const QPoint &)));
1577         connect(tb, SIGNAL(tabCloseRequested(int)),
1578                 this, SLOT(closeTab(int)));
1579
1580         setUsesScrollButtons(true);
1581 }
1582
1583
1584 void TabWorkArea::paintEvent(QPaintEvent * event)
1585 {
1586         if (tabBar()->isVisible()) {
1587                 QTabWidget::paintEvent(event);
1588         } else {
1589                 // Prevent the selected tab to influence the
1590                 // painting of the frame of the tab widget.
1591                 // This is needed for gtk style in Qt.
1592                 QStylePainter p(this);
1593 #if QT_VERSION < 0x050000
1594                 QStyleOptionTabWidgetFrameV2 opt;
1595 #else
1596                 QStyleOptionTabWidgetFrame opt;
1597 #endif
1598                 initStyleOption(&opt);
1599                 opt.rect = style()->subElementRect(QStyle::SE_TabWidgetTabPane,
1600                         &opt, this);
1601                 opt.selectedTabRect = QRect();
1602                 p.drawPrimitive(QStyle::PE_FrameTabWidget, opt);
1603         }
1604 }
1605
1606
1607 void TabWorkArea::mouseDoubleClickEvent(QMouseEvent * event)
1608 {
1609         if (event->button() != Qt::LeftButton)
1610                 return;
1611
1612         // return early if double click on existing tabs
1613         for (int i = 0; i < count(); ++i)
1614                 if (tabBar()->tabRect(i).contains(event->pos()))
1615                         return;
1616
1617         dispatch(FuncRequest(LFUN_BUFFER_NEW));
1618 }
1619
1620
1621 void TabWorkArea::setFullScreen(bool full_screen)
1622 {
1623         for (int i = 0; i != count(); ++i) {
1624                 if (GuiWorkArea * wa = workArea(i))
1625                         wa->setFullScreen(full_screen);
1626         }
1627
1628         if (lyxrc.full_screen_tabbar)
1629                 showBar(!full_screen && count() > 1);
1630         else
1631                 showBar(count() > 1);
1632 }
1633
1634
1635 void TabWorkArea::showBar(bool show)
1636 {
1637         tabBar()->setEnabled(show);
1638         tabBar()->setVisible(show);
1639         closeBufferButton->setVisible(show && lyxrc.single_close_tab_button);
1640         setTabsClosable(!lyxrc.single_close_tab_button);
1641 }
1642
1643
1644 GuiWorkArea * TabWorkArea::currentWorkArea()
1645 {
1646         if (count() == 0)
1647                 return 0;
1648
1649         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(currentWidget());
1650         LATTEST(wa);
1651         return wa;
1652 }
1653
1654
1655 GuiWorkArea * TabWorkArea::workArea(int index)
1656 {
1657         return dynamic_cast<GuiWorkArea *>(widget(index));
1658 }
1659
1660
1661 GuiWorkArea * TabWorkArea::workArea(Buffer & buffer)
1662 {
1663         // FIXME: this method doesn't work if we have more than work area
1664         // showing the same buffer.
1665         for (int i = 0; i != count(); ++i) {
1666                 GuiWorkArea * wa = workArea(i);
1667                 LASSERT(wa, return 0);
1668                 if (&wa->bufferView().buffer() == &buffer)
1669                         return wa;
1670         }
1671         return 0;
1672 }
1673
1674
1675 void TabWorkArea::closeAll()
1676 {
1677         while (count()) {
1678                 GuiWorkArea * wa = workArea(0);
1679                 LASSERT(wa, return);
1680                 removeTab(0);
1681                 delete wa;
1682         }
1683 }
1684
1685
1686 bool TabWorkArea::setCurrentWorkArea(GuiWorkArea * work_area)
1687 {
1688         LASSERT(work_area, return false);
1689         int index = indexOf(work_area);
1690         if (index == -1)
1691                 return false;
1692
1693         if (index == currentIndex())
1694                 // Make sure the work area is up to date.
1695                 on_currentTabChanged(index);
1696         else
1697                 // Switch to the work area.
1698                 setCurrentIndex(index);
1699         work_area->setFocus();
1700
1701         return true;
1702 }
1703
1704
1705 GuiWorkArea * TabWorkArea::addWorkArea(Buffer & buffer, GuiView & view)
1706 {
1707         GuiWorkArea * wa = new GuiWorkArea(buffer, view);
1708         wa->setUpdatesEnabled(false);
1709         // Hide tabbar if there's no tab (avoid a resize and a flashing tabbar
1710         // when hiding it again below).
1711         if (!(currentWorkArea() && currentWorkArea()->isFullScreen()))
1712                 showBar(count() > 0);
1713         addTab(wa, wa->windowTitle());
1714         QObject::connect(wa, SIGNAL(titleChanged(GuiWorkArea *)),
1715                 this, SLOT(updateTabTexts()));
1716         if (currentWorkArea() && currentWorkArea()->isFullScreen())
1717                 setFullScreen(true);
1718         else
1719                 // Hide tabbar if there's only one tab.
1720                 showBar(count() > 1);
1721
1722         updateTabTexts();
1723
1724         return wa;
1725 }
1726
1727
1728 bool TabWorkArea::removeWorkArea(GuiWorkArea * work_area)
1729 {
1730         LASSERT(work_area, return false);
1731         int index = indexOf(work_area);
1732         if (index == -1)
1733                 return false;
1734
1735         work_area->setUpdatesEnabled(false);
1736         removeTab(index);
1737         delete work_area;
1738
1739         if (count()) {
1740                 // make sure the next work area is enabled.
1741                 currentWidget()->setUpdatesEnabled(true);
1742                 if (currentWorkArea() && currentWorkArea()->isFullScreen())
1743                         setFullScreen(true);
1744                 else
1745                         // Show tabbar only if there's more than one tab.
1746                         showBar(count() > 1);
1747         } else
1748                 lastWorkAreaRemoved();
1749
1750         updateTabTexts();
1751
1752         return true;
1753 }
1754
1755
1756 void TabWorkArea::on_currentTabChanged(int i)
1757 {
1758         // returns e.g. on application destruction
1759         if (i == -1)
1760                 return;
1761         GuiWorkArea * wa = workArea(i);
1762         LASSERT(wa, return);
1763         wa->setUpdatesEnabled(true);
1764         wa->redraw(true);
1765         wa->setFocus();
1766         ///
1767         currentWorkAreaChanged(wa);
1768
1769         LYXERR(Debug::GUI, "currentTabChanged " << i
1770                 << " File: " << wa->bufferView().buffer().absFileName());
1771 }
1772
1773
1774 void TabWorkArea::closeCurrentBuffer()
1775 {
1776         GuiWorkArea * wa;
1777         if (clicked_tab_ == -1)
1778                 wa = currentWorkArea();
1779         else {
1780                 wa = workArea(clicked_tab_);
1781                 LASSERT(wa, return);
1782         }
1783         wa->view().closeWorkArea(wa);
1784 }
1785
1786
1787 void TabWorkArea::hideCurrentTab()
1788 {
1789         GuiWorkArea * wa;
1790         if (clicked_tab_ == -1)
1791                 wa = currentWorkArea();
1792         else {
1793                 wa = workArea(clicked_tab_);
1794                 LASSERT(wa, return);
1795         }
1796         wa->view().hideWorkArea(wa);
1797 }
1798
1799
1800 void TabWorkArea::closeTab(int index)
1801 {
1802         on_currentTabChanged(index);
1803         GuiWorkArea * wa;
1804         if (index == -1)
1805                 wa = currentWorkArea();
1806         else {
1807                 wa = workArea(index);
1808                 LASSERT(wa, return);
1809         }
1810         wa->view().closeWorkArea(wa);
1811 }
1812
1813
1814 ///
1815 class DisplayPath {
1816 public:
1817         /// make vector happy
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_ += ".../";
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 ? ".../" : "") + filename_;
1862         }
1863         ///
1864         QString forecastPathString() const
1865         {
1866                 if (postfix_.count() == 0)
1867                         return displayString();
1868
1869                 return prefix_
1870                         + (dottedPrefix_ ? ".../" : "")
1871                         + postfix_.front() + "/";
1872         }
1873         ///
1874         bool final() const { return postfix_.empty(); }
1875         ///
1876         int tab() const { return tab_; }
1877
1878 private:
1879         ///
1880         QString prefix_;
1881         ///
1882         QStringList postfix_;
1883         ///
1884         QString filename_;
1885         ///
1886         QString abs_;
1887         ///
1888         int tab_;
1889         ///
1890         bool dottedPrefix_;
1891 };
1892
1893
1894 ///
1895 bool operator<(DisplayPath const & a, DisplayPath const & b)
1896 {
1897         return a.displayString() < b.displayString();
1898 }
1899
1900 ///
1901 bool operator==(DisplayPath const & a, DisplayPath const & b)
1902 {
1903         return a.displayString() == b.displayString();
1904 }
1905
1906
1907 void TabWorkArea::updateTabTexts()
1908 {
1909         size_t n = count();
1910         if (n == 0)
1911                 return;
1912         std::list<DisplayPath> paths;
1913         typedef std::list<DisplayPath>::iterator It;
1914
1915         // collect full names first: path into postfix, empty prefix and
1916         // filename without extension
1917         for (size_t i = 0; i < n; ++i) {
1918                 GuiWorkArea * i_wa = workArea(i);
1919                 FileName const fn = i_wa->bufferView().buffer().fileName();
1920                 paths.push_back(DisplayPath(i, fn));
1921         }
1922
1923         // go through path segments and see if it helps to make the path more unique
1924         bool somethingChanged = true;
1925         bool allFinal = false;
1926         while (somethingChanged && !allFinal) {
1927                 // adding path segments changes order
1928                 paths.sort();
1929
1930                 LYXERR(Debug::GUI, "updateTabTexts() iteration start");
1931                 somethingChanged = false;
1932                 allFinal = true;
1933
1934                 // find segments which are not unique (i.e. non-atomic)
1935                 It it = paths.begin();
1936                 It segStart = it;
1937                 QString segString = it->displayString();
1938                 for (; it != paths.end(); ++it) {
1939                         // look to the next item
1940                         It next = it;
1941                         ++next;
1942
1943                         // final?
1944                         allFinal = allFinal && it->final();
1945
1946                         LYXERR(Debug::GUI, "it = " << it->abs()
1947                                << " => " << it->displayString());
1948
1949                         // still the same segment?
1950                         QString nextString;
1951                         if ((next != paths.end()
1952                              && (nextString = next->displayString()) == segString))
1953                                 continue;
1954                         LYXERR(Debug::GUI, "segment ended");
1955
1956                         // only a trivial one with one element?
1957                         if (it == segStart) {
1958                                 // start new segment
1959                                 segStart = next;
1960                                 segString = nextString;
1961                                 continue;
1962                         }
1963
1964                         // we found a non-atomic segment segStart <= sit <= it < next.
1965                         // Shift path segments and hope for the best
1966                         // that it makes the path more unique.
1967                         somethingChanged = true;
1968                         It sit = segStart;
1969                         QString dspString = sit->forecastPathString();
1970                         LYXERR(Debug::GUI, "first forecast found for "
1971                                << sit->abs() << " => " << dspString);
1972                         ++sit;
1973                         bool moreUnique = false;
1974                         for (; sit != next; ++sit) {
1975                                 if (sit->forecastPathString() != dspString) {
1976                                         LYXERR(Debug::GUI, "different forecast found for "
1977                                                 << sit->abs() << " => " << sit->forecastPathString());
1978                                         moreUnique = true;
1979                                         break;
1980                                 }
1981                                 LYXERR(Debug::GUI, "same forecast found for "
1982                                         << sit->abs() << " => " << dspString);
1983                         }
1984
1985                         // if the path segment helped, add it. Otherwise add dots
1986                         bool dots = !moreUnique;
1987                         LYXERR(Debug::GUI, "using dots = " << dots);
1988                         for (sit = segStart; sit != next; ++sit) {
1989                                 sit->shiftPathSegment(dots);
1990                                 LYXERR(Debug::GUI, "shifting "
1991                                         << sit->abs() << " => " << sit->displayString());
1992                         }
1993
1994                         // start new segment
1995                         segStart = next;
1996                         segString = nextString;
1997                 }
1998         }
1999
2000         // set new tab titles
2001         for (It it = paths.begin(); it != paths.end(); ++it) {
2002                 int const tab_index = it->tab();
2003                 Buffer const & buf = workArea(tab_index)->bufferView().buffer();
2004                 QString tab_text = it->displayString().replace("&", "&&");
2005                 if (!buf.fileName().empty() && !buf.isClean())
2006                         tab_text += "*";
2007                 setTabText(tab_index, tab_text);
2008                 setTabToolTip(tab_index, it->abs());
2009         }
2010 }
2011
2012
2013 void TabWorkArea::showContextMenu(const QPoint & pos)
2014 {
2015         // which tab?
2016         clicked_tab_ = static_cast<DragTabBar *>(tabBar())->tabAt(pos);
2017         if (clicked_tab_ == -1)
2018                 return;
2019
2020         // show tab popup
2021         QMenu popup;
2022         popup.addAction(QIcon(getPixmap("images/", "hidetab", "png")),
2023                 qt_("Hide tab"), this, SLOT(hideCurrentTab()));
2024         popup.addAction(QIcon(getPixmap("images/", "closetab", "png")),
2025                 qt_("Close tab"), this, SLOT(closeCurrentBuffer()));
2026         popup.exec(tabBar()->mapToGlobal(pos));
2027
2028         clicked_tab_ = -1;
2029 }
2030
2031
2032 void TabWorkArea::moveTab(int fromIndex, int toIndex)
2033 {
2034         QWidget * w = widget(fromIndex);
2035         QIcon icon = tabIcon(fromIndex);
2036         QString text = tabText(fromIndex);
2037
2038         setCurrentIndex(fromIndex);
2039         removeTab(fromIndex);
2040         insertTab(toIndex, w, icon, text);
2041         setCurrentIndex(toIndex);
2042 }
2043
2044
2045 DragTabBar::DragTabBar(QWidget* parent)
2046         : QTabBar(parent)
2047 {
2048         setAcceptDrops(true);
2049         setTabsClosable(!lyxrc.single_close_tab_button);
2050 }
2051
2052
2053 void DragTabBar::mousePressEvent(QMouseEvent * event)
2054 {
2055         if (event->button() == Qt::LeftButton)
2056                 dragStartPos_ = event->pos();
2057         QTabBar::mousePressEvent(event);
2058 }
2059
2060
2061 void DragTabBar::mouseMoveEvent(QMouseEvent * event)
2062 {
2063         // If the left button isn't pressed anymore then return
2064         if (!(event->buttons() & Qt::LeftButton))
2065                 return;
2066
2067         // If the distance is too small then return
2068         if ((event->pos() - dragStartPos_).manhattanLength()
2069             < QApplication::startDragDistance())
2070                 return;
2071
2072         // did we hit something after all?
2073         int tab = tabAt(dragStartPos_);
2074         if (tab == -1)
2075                 return;
2076
2077         // simulate button release to remove highlight from button
2078         int i = currentIndex();
2079         QMouseEvent me(QEvent::MouseButtonRelease, dragStartPos_,
2080                 event->button(), event->buttons(), 0);
2081         QTabBar::mouseReleaseEvent(&me);
2082         setCurrentIndex(i);
2083
2084         // initiate Drag
2085         QDrag * drag = new QDrag(this);
2086         QMimeData * mimeData = new QMimeData;
2087         // a crude way to distinguish tab-reodering drops from other ones
2088         mimeData->setData("action", "tab-reordering") ;
2089         drag->setMimeData(mimeData);
2090
2091         // get tab pixmap as cursor
2092         QRect r = tabRect(tab);
2093         QPixmap pixmap(r.size());
2094         render(&pixmap, - r.topLeft());
2095         drag->setPixmap(pixmap);
2096         drag->exec();
2097 }
2098
2099
2100 void DragTabBar::dragEnterEvent(QDragEnterEvent * event)
2101 {
2102         // Only accept if it's an tab-reordering request
2103         QMimeData const * m = event->mimeData();
2104         QStringList formats = m->formats();
2105         if (formats.contains("action")
2106             && m->data("action") == "tab-reordering")
2107                 event->acceptProposedAction();
2108 }
2109
2110
2111 void DragTabBar::dropEvent(QDropEvent * event)
2112 {
2113         int fromIndex = tabAt(dragStartPos_);
2114         int toIndex = tabAt(event->pos());
2115
2116         // Tell interested objects that
2117         if (fromIndex != toIndex)
2118                 tabMoveRequested(fromIndex, toIndex);
2119         event->acceptProposedAction();
2120 }
2121
2122
2123 } // namespace frontend
2124 } // namespace lyx
2125
2126 #include "moc_GuiWorkArea.cpp"