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
  53 #include "frontends/Application.h"
  54 #include "frontends/FontMetrics.h"
  55 #include "frontends/WorkAreaManager.h"
  56
  57 #include <QContextMenuEvent>
  58 #if (QT_VERSION < 0x050000)
  59 #include <QInputContext>
  60 #endif
  61 #include <QDrag>
  62 #include <QHelpEvent>
  63 #ifdef Q_WS_MACX
  64 #include <QMacStyle>
  65 #endif
  66 #include <QMainWindow>
  67 #include <QMimeData>
  68 #include <QMenu>
  69 #include <QPainter>
  70 #include <QPalette>
  71 #include <QPixmapCache>
  72 #include <QScrollBar>
  73 #include <QStyleOption>
  74 #include <QStylePainter>
  75 #include <QTimer>
  76 #include <QToolButton>
  77 #include <QToolTip>
  78 #include <QMenuBar>
  79
  80 #include "support/bind.h"
  81
  82 #include <cmath>
  83
  84 int const TabIndicatorWidth = 3;
  85
  86 #undef KeyPress
  87 #undef NoModifier
  88
  89 using namespace std;
  90 using namespace lyx::support;
  91
  92 namespace lyx {
  93
  94
  95 /// return the LyX mouse button state from Qt's
  96 static mouse_button::state q_button_state(Qt::MouseButton button)
  97 {
  98         mouse_button::state b = mouse_button::none;
  99         switch (button) {
 100                 case Qt::LeftButton:
 101                         b = mouse_button::button1;
 102                         break;
 103                 case Qt::MidButton:
 104                         b = mouse_button::button2;
 105                         break;
 106                 case Qt::RightButton:
 107                         b = mouse_button::button3;
 108                         break;
 109                 default:
 110                         break;
 111         }
 112         return b;
 113 }
 114
 115
 116 /// return the LyX mouse button state from Qt's
 117 mouse_button::state q_motion_state(Qt::MouseButtons state)
 118 {
 119         mouse_button::state b = mouse_button::none;
 120         if (state & Qt::LeftButton)
 121                 b |= mouse_button::button1;
 122         if (state & Qt::MidButton)
 123                 b |= mouse_button::button2;
 124         if (state & Qt::RightButton)
 125                 b |= mouse_button::button3;
 126         return b;
 127 }
 128
 129
 130 namespace frontend {
 131
 132 class CursorWidget {
 133 public:
 134         CursorWidget() {
 135                 recomputeWidth();
 136         }
 137
 138         void draw(QPainter & painter)
 139         {
 140                 if (!show_ || !rect_.isValid())
 141                         return;
 142
 143                 int y = rect_.top();
 144                 int l = x_ - rect_.left();
 145                 int r = rect_.right() - x_;
 146                 int bot = rect_.bottom();
 147
 148                 // draw vertical line
 149                 painter.fillRect(x_, y, cursor_width_, rect_.height(), color_);
 150
 151                 // draw RTL/LTR indication
 152                 painter.setPen(color_);
 153                 if (l_shape_) {
 154                         if (rtl_)
 155                                 painter.drawLine(x_, bot, x_ - l, bot);
 156                         else
 157                                 painter.drawLine(x_, bot, x_ + cursor_width_ + r, bot);
 158                 }
 159
 160                 // draw completion triangle
 161                 if (completable_) {
 162                         int m = y + rect_.height() / 2;
 163                         int d = TabIndicatorWidth - 1;
 164                         if (rtl_) {
 165                                 painter.drawLine(x_ - 1, m - d, x_ - 1 - d, m);
 166                                 painter.drawLine(x_ - 1, m + d, x_ - 1 - d, m);
 167                         } else {
 168                                 painter.drawLine(x_ + cursor_width_, m - d, x_ + cursor_width_ + d, m);
 169                                 painter.drawLine(x_ + cursor_width_, m + d, x_ + cursor_width_ + d, m);
 170                         }
 171                 }
 172         }
 173
 174         void update(int x, int y, int h, bool l_shape,
 175                 bool rtl, bool completable)
 176         {
 177                 color_ = guiApp->colorCache().get(Color_cursor);
 178                 l_shape_ = l_shape;
 179                 rtl_ = rtl;
 180                 completable_ = completable;
 181                 x_ = x;
 182
 183                 // extension to left and right
 184                 int l = 0;
 185                 int r = 0;
 186
 187                 // RTL/LTR indication
 188                 if (l_shape_) {
 189                         if (rtl)
 190                                 l += h / 3;
 191                         else
 192                                 r += h / 3;
 193                 }
 194
 195                 // completion triangle
 196                 if (completable_) {
 197                         if (rtl)
 198                                 l = max(l, TabIndicatorWidth);
 199                         else
 200                                 r = max(r, TabIndicatorWidth);
 201                 }
 202
 203                 // compute overall rectangle
 204                 rect_ = QRect(x - l, y, cursor_width_ + r + l, h);
 205         }
 206
 207         void show(bool set_show = true) { show_ = set_show; }
 208         void hide() { show_ = false; }
 209         int cursorWidth() const { return cursor_width_; }
 210         void recomputeWidth() {
 211                 cursor_width_ = lyxrc.cursor_width
 212                         ? lyxrc.cursor_width
 213                         : 1 + int((lyxrc.zoom + 50) / 200.0);
 214         }
 215
 216         QRect const & rect() { return rect_; }
 217
 218 private:
 219         /// cursor is in RTL or LTR text
 220         bool rtl_;
 221         /// indication for RTL or LTR
 222         bool l_shape_;
 223         /// triangle to show that a completion is available
 224         bool completable_;
 225         ///
 226         bool show_;
 227         ///
 228         QColor color_;
 229         /// rectangle, possibly with l_shape and completion triangle
 230         QRect rect_;
 231         /// x position (were the vertical line is drawn)
 232         int x_;
 233
 234         int cursor_width_;
 235 };
 236
 237
 238 // This is a 'heartbeat' generating synthetic mouse move events when the
 239 // cursor is at the top or bottom edge of the viewport. One scroll per 0.2 s
 240 SyntheticMouseEvent::SyntheticMouseEvent()
 241         : timeout(200), restart_timeout(true)
 242 {}
 243
 244
 245 GuiWorkArea::Private::Private(GuiWorkArea * parent)
 246 : p(parent), screen_(0), buffer_view_(0), lyx_view_(0), cursor_visible_(false),
 247 need_resize_(false), schedule_redraw_(false), preedit_lines_(1),
 248 completer_(new GuiCompleter(p, p))
 249 {
 250 }
 251
 252
 253 GuiWorkArea::GuiWorkArea(QWidget * /* w */)
 254 : d(new Private(this))
 255 {
 256 }
 257
 258
 259 GuiWorkArea::GuiWorkArea(Buffer & buffer, GuiView & gv)
 260 : d(new Private(this))
 261 {
 262         setGuiView(gv);
 263         setBuffer(buffer);
 264         init();
 265 }
 266
 267
 268 void GuiWorkArea::init()
 269 {
 270         // Setup the signals
 271         connect(&d->cursor_timeout_, SIGNAL(timeout()),
 272                 this, SLOT(toggleCursor()));
 273
 274         int const time = QApplication::cursorFlashTime() / 2;
 275         if (time > 0) {
 276                 d->cursor_timeout_.setInterval(time);
 277                 d->cursor_timeout_.start();
 278         } else {
 279                 // let's initialize this just to be safe
 280                 d->cursor_timeout_.setInterval(500);
 281         }
 282
 283         d->resetScreen();
 284         // With Qt4.5 a mouse event will happen before the first paint event
 285         // so make sure that the buffer view has an up to date metrics.
 286         d->buffer_view_->resize(viewport()->width(), viewport()->height());
 287         d->cursor_ = new frontend::CursorWidget();
 288         d->cursor_->hide();
 289
 290         setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 291         setAcceptDrops(true);
 292         setMouseTracking(true);
 293         setMinimumSize(100, 70);
 294         setFrameStyle(QFrame::NoFrame);
 295         updateWindowTitle();
 296
 297         viewport()->setAutoFillBackground(false);
 298         // We don't need double-buffering nor SystemBackground on
 299         // the viewport because we have our own backing pixmap.
 300         viewport()->setAttribute(Qt::WA_NoSystemBackground);
 301
 302         setFocusPolicy(Qt::StrongFocus);
 303
 304         d->setCursorShape(Qt::IBeamCursor);
 305
 306         d->synthetic_mouse_event_.timeout.timeout.connect(
 307                 bind(&GuiWorkArea::generateSyntheticMouseEvent,
 308                                         this));
 309
 310         // Initialize the vertical Scroll Bar
 311         QObject::connect(verticalScrollBar(), SIGNAL(valueChanged(int)),
 312                 this, SLOT(scrollTo(int)));
 313
 314         LYXERR(Debug::GUI, "viewport width: " << viewport()->width()
 315                 << "  viewport height: " << viewport()->height());
 316
 317         // Enables input methods for asian languages.
 318         // Must be set when creating custom text editing widgets.
 319         setAttribute(Qt::WA_InputMethodEnabled, true);
 320
 321         d->dialog_mode_ = false;
 322 }
 323
 324
 325 GuiWorkArea::~GuiWorkArea()
 326 {
 327         d->buffer_view_->buffer().workAreaManager().remove(this);
 328         delete d->screen_;
 329         delete d->buffer_view_;
 330         delete d->cursor_;
 331         // Completer has a QObject parent and is thus automatically destroyed.
 332         // See #4758.
 333         // delete completer_;
 334         delete d;
 335 }
 336
 337
 338 Qt::CursorShape GuiWorkArea::cursorShape() const
 339 {
 340         return viewport()->cursor().shape();
 341 }
 342
 343
 344 void GuiWorkArea::Private::setCursorShape(Qt::CursorShape shape)
 345 {
 346         p->viewport()->setCursor(shape);
 347 }
 348
 349
 350 void GuiWorkArea::Private::updateCursorShape()
 351 {
 352         setCursorShape(buffer_view_->clickableInset()
 353                 ? Qt::PointingHandCursor : Qt::IBeamCursor);
 354 }
 355
 356
 357 void GuiWorkArea::setGuiView(GuiView & gv)
 358 {
 359         d->lyx_view_ = &gv;
 360 }
 361
 362
 363 void GuiWorkArea::setBuffer(Buffer & buffer)
 364 {
 365         delete d->buffer_view_;
 366         d->buffer_view_ = new BufferView(buffer);
 367         buffer.workAreaManager().add(this);
 368
 369         // HACK: Prevents an additional redraw when the scrollbar pops up
 370         // which regularily happens on documents with more than one page.
 371         // The policy  should be set to "Qt::ScrollBarAsNeeded" soon.
 372         // Since we have no geometry information yet, we assume that
 373         // a document needs a scrollbar if there is more then four
 374         // paragraph in the outermost text.
 375         if (buffer.text().paragraphs().size() > 4)
 376                 setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
 377         QTimer::singleShot(50, this, SLOT(fixVerticalScrollBar()));
 378 }
 379
 380
 381 void GuiWorkArea::fixVerticalScrollBar()
 382 {
 383         if (!isFullScreen())
 384                 setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
 385 }
 386
 387
 388 void GuiWorkArea::close()
 389 {
 390         d->lyx_view_->removeWorkArea(this);
 391 }
 392
 393
 394 void GuiWorkArea::setFullScreen(bool full_screen)
 395 {
 396         d->buffer_view_->setFullScreen(full_screen);
 397         setFrameStyle(QFrame::NoFrame);
 398         if (full_screen) {
 399                 setFrameStyle(QFrame::NoFrame);
 400                 if (lyxrc.full_screen_scrollbar)
 401                         setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 402         } else
 403                 setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
 404 }
 405
 406
 407 BufferView & GuiWorkArea::bufferView()
 408 {
 409         return *d->buffer_view_;
 410 }
 411
 412
 413 BufferView const & GuiWorkArea::bufferView() const
 414 {
 415         return *d->buffer_view_;
 416 }
 417
 418
 419 void GuiWorkArea::stopBlinkingCursor()
 420 {
 421         d->cursor_timeout_.stop();
 422         d->hideCursor();
 423 }
 424
 425
 426 void GuiWorkArea::startBlinkingCursor()
 427 {
 428         // do not show the cursor if the view is busy
 429         if (view().busy())
 430                 return;
 431
 432         Point p;
 433         int h = 0;
 434         d->buffer_view_->cursorPosAndHeight(p, h);
 435         // Don't start blinking if the cursor isn't on screen.
 436         if (!d->buffer_view_->cursorInView(p, h))
 437                 return;
 438
 439         d->showCursor();
 440
 441         //we're not supposed to cache this value.
 442         int const time = QApplication::cursorFlashTime() / 2;
 443         if (time <= 0)
 444                 return;
 445         d->cursor_timeout_.setInterval(time);
 446         d->cursor_timeout_.start();
 447 }
 448
 449
 450 void GuiWorkArea::redraw(bool update_metrics)
 451 {
 452         if (!isVisible())
 453                 // No need to redraw in this case.
 454                 return;
 455
 456         // No need to do anything if this is the current view. The BufferView
 457         // metrics are already up to date.
 458         if (update_metrics || d->lyx_view_ != guiApp->currentView()
 459                 || d->lyx_view_->currentWorkArea() != this) {
 460                 // FIXME: it would be nice to optimize for the off-screen case.
 461                 d->buffer_view_->cursor().fixIfBroken();
 462                 d->buffer_view_->updateMetrics();
 463                 d->buffer_view_->cursor().fixIfBroken();
 464         }
 465
 466         // update cursor position, because otherwise it has to wait until
 467         // the blinking interval is over
 468         if (d->cursor_visible_) {
 469                 d->hideCursor();
 470                 d->showCursor();
 471         }
 472
 473         LYXERR(Debug::WORKAREA, "WorkArea::redraw screen");
 474         d->updateScreen();
 475         update(0, 0, viewport()->width(), viewport()->height());
 476
 477         /// \warning: scrollbar updating *must* be done after the BufferView is drawn
 478         /// because \c BufferView::updateScrollbar() is called in \c BufferView::draw().
 479         d->updateScrollbar();
 480         d->lyx_view_->updateStatusBar();
 481
 482         if (lyxerr.debugging(Debug::WORKAREA))
 483                 d->buffer_view_->coordCache().dump();
 484
 485         updateWindowTitle();
 486
 487         d->updateCursorShape();
 488 }
 489
 490
 491 void GuiWorkArea::processKeySym(KeySymbol const & key, KeyModifier mod)
 492 {
 493         if (d->lyx_view_->isFullScreen() && d->lyx_view_->menuBar()->isVisible()
 494                 && lyxrc.full_screen_menubar) {
 495                 // FIXME HACK: we should not have to do this here. See related comment
 496                 // in GuiView::event() (QEvent::ShortcutOverride)
 497                 d->lyx_view_->menuBar()->hide();
 498         }
 499
 500         // In order to avoid bad surprise in the middle of an operation,
 501         // we better stop the blinking cursor...
 502         // the cursor gets restarted in GuiView::restartCursor()
 503         stopBlinkingCursor();
 504         guiApp->processKeySym(key, mod);
 505 }
 506
 507
 508 void GuiWorkArea::Private::dispatch(FuncRequest const & cmd0, KeyModifier mod)
 509 {
 510         // Handle drag&drop
 511         if (cmd0.action() == LFUN_FILE_OPEN) {
 512                 DispatchResult dr;
 513                 lyx_view_->dispatch(cmd0, dr);
 514                 return;
 515         }
 516
 517         FuncRequest cmd;
 518
 519         if (cmd0.action() == LFUN_MOUSE_PRESS) {
 520                 if (mod == ShiftModifier)
 521                         cmd = FuncRequest(cmd0, "region-select");
 522                 else if (mod == ControlModifier)
 523                         cmd = FuncRequest(cmd0, "paragraph-select");
 524                 else
 525                         cmd = cmd0;
 526         }
 527         else
 528                 cmd = cmd0;
 529
 530         bool const notJustMovingTheMouse =
 531                 cmd.action() != LFUN_MOUSE_MOTION || cmd.button() != mouse_button::none;
 532
 533         // In order to avoid bad surprise in the middle of an operation, we better stop
 534         // the blinking cursor.
 535         if (notJustMovingTheMouse)
 536                 p->stopBlinkingCursor();
 537
 538         buffer_view_->mouseEventDispatch(cmd);
 539
 540         // Skip these when selecting
 541         // FIXME: let GuiView take care of those.
 542         if (cmd.action() != LFUN_MOUSE_MOTION) {
 543                 completer_->updateVisibility(false, false);
 544                 lyx_view_->updateDialogs();
 545                 lyx_view_->updateStatusBar();
 546         }
 547
 548         // GUI tweaks except with mouse motion with no button pressed.
 549         if (notJustMovingTheMouse) {
 550                 // Slight hack: this is only called currently when we
 551                 // clicked somewhere, so we force through the display
 552                 // of the new status here.
 553                 // FIXME: let GuiView take care of those.
 554                 lyx_view_->clearMessage();
 555
 556                 // Show the cursor immediately after any operation
 557                 p->startBlinkingCursor();
 558         }
 559
 560         updateCursorShape();
 561 }
 562
 563
 564 void GuiWorkArea::Private::resizeBufferView()
 565 {
 566         // WARNING: Please don't put any code that will trigger a repaint here!
 567         // We are already inside a paint event.
 568         p->stopBlinkingCursor();
 569         // Warn our container (GuiView).
 570         p->busy(true);
 571
 572         Point point;
 573         int h = 0;
 574         buffer_view_->cursorPosAndHeight(point, h);
 575         bool const cursor_in_view = buffer_view_->cursorInView(point, h);
 576         buffer_view_->resize(p->viewport()->width(), p->viewport()->height());
 577         if (cursor_in_view)
 578                 buffer_view_->scrollToCursor();
 579         updateScreen();
 580
 581         // Update scrollbars which might have changed due different
 582         // BufferView dimension. This is especially important when the
 583         // BufferView goes from zero-size to the real-size for the first time,
 584         // as the scrollbar paramters are then set for the first time.
 585         updateScrollbar();
 586
 587         need_resize_ = false;
 588         p->busy(false);
 589         // Eventually, restart the cursor after the resize event.
 590         // We might be resizing even if the focus is on another widget so we only
 591         // restart the cursor if we have the focus.
 592         if (p->hasFocus())
 593                 QTimer::singleShot(50, p, SLOT(startBlinkingCursor()));
 594 }
 595
 596
 597 void GuiWorkArea::Private::showCursor()
 598 {
 599         if (cursor_visible_)
 600                 return;
 601
 602         Point p;
 603         int h = 0;
 604         buffer_view_->cursorPosAndHeight(p, h);
 605         if (!buffer_view_->cursorInView(p, h))
 606                 return;
 607
 608         // RTL or not RTL
 609         bool l_shape = false;
 610         Font const & realfont = buffer_view_->cursor().real_current_font;
 611         BufferParams const & bp = buffer_view_->buffer().params();
 612         bool const samelang = realfont.language() == bp.language;
 613         bool const isrtl = realfont.isVisibleRightToLeft();
 614
 615         if (!samelang || isrtl != bp.language->rightToLeft())
 616                 l_shape = true;
 617
 618         // The ERT language hack needs fixing up
 619         if (realfont.language() == latex_language)
 620                 l_shape = false;
 621
 622         // show cursor on screen
 623         Cursor & cur = buffer_view_->cursor();
 624         bool completable = cur.inset().showCompletionCursor()
 625                 && completer_->completionAvailable()
 626                 && !completer_->popupVisible()
 627                 && !completer_->inlineVisible();
 628         cursor_visible_ = true;
 629         cursor_->recomputeWidth();
 630         showCursor(p.x_, p.y_, h, l_shape, isrtl, completable);
 631 }
 632
 633
 634 void GuiWorkArea::Private::hideCursor()
 635 {
 636         if (!cursor_visible_)
 637                 return;
 638
 639         cursor_visible_ = false;
 640         removeCursor();
 641 }
 642
 643
 644 void GuiWorkArea::toggleCursor()
 645 {
 646         if (d->cursor_visible_)
 647                 d->hideCursor();
 648         else
 649                 d->showCursor();
 650 }
 651
 652
 653 void GuiWorkArea::Private::updateScrollbar()
 654 {
 655         ScrollbarParameters const & scroll_ = buffer_view_->scrollbarParameters();
 656         // WARNING: don't touch at the scrollbar value like this:
 657         //   verticalScrollBar()->setValue(scroll_.position);
 658         // because this would cause a recursive signal/slot calling with
 659         // GuiWorkArea::scrollTo
 660         p->verticalScrollBar()->setRange(scroll_.min, scroll_.max);
 661         p->verticalScrollBar()->setPageStep(scroll_.page_step);
 662         p->verticalScrollBar()->setSingleStep(scroll_.single_step);
 663         p->verticalScrollBar()->setSliderPosition(scroll_.position);
 664 }
 665
 666
 667 void GuiWorkArea::scrollTo(int value)
 668 {
 669         stopBlinkingCursor();
 670         d->buffer_view_->scrollDocView(value, true);
 671
 672         if (lyxrc.cursor_follows_scrollbar) {
 673                 d->buffer_view_->setCursorFromScrollbar();
 674                 // FIXME: let GuiView take care of those.
 675                 d->lyx_view_->updateLayoutList();
 676         }
 677         // Show the cursor immediately after any operation.
 678         startBlinkingCursor();
 679 #ifdef Q_WS_X11
 680         QApplication::syncX();
 681 #endif
 682 }
 683
 684
 685 bool GuiWorkArea::event(QEvent * e)
 686 {
 687         switch (e->type()) {
 688         case QEvent::ToolTip: {
 689                 QHelpEvent * helpEvent = static_cast<QHelpEvent *>(e);
 690                 if (lyxrc.use_tooltip) {
 691                         QPoint pos = helpEvent->pos();
 692                         if (pos.x() < viewport()->width()) {
 693                                 QString s = toqstr(d->buffer_view_->toolTip(pos.x(), pos.y()));
 694                                 QToolTip::showText(helpEvent->globalPos(), s);
 695                         }
 696                         else
 697                                 QToolTip::hideText();
 698                 }
 699                 // Don't forget to accept the event!
 700                 e->accept();
 701                 return true;
 702         }
 703
 704         case QEvent::ShortcutOverride: {
 705                 // We catch this event in order to catch the Tab or Shift+Tab key press
 706                 // which are otherwise reserved to focus switching between controls
 707                 // within a dialog.
 708                 QKeyEvent * ke = static_cast<QKeyEvent*>(e);
 709                 if ((ke->key() == Qt::Key_Tab && ke->modifiers() == Qt::NoModifier)
 710                         || (ke->key() == Qt::Key_Backtab && (
 711                                 ke->modifiers() == Qt::ShiftModifier
 712                                 || ke->modifiers() == Qt::NoModifier))) {
 713                         keyPressEvent(ke);
 714                         return true;
 715                 }
 716                 return QAbstractScrollArea::event(e);
 717         }
 718
 719         default:
 720                 return QAbstractScrollArea::event(e);
 721         }
 722         return false;
 723 }
 724
 725
 726 void GuiWorkArea::contextMenuEvent(QContextMenuEvent * e)
 727 {
 728         string name;
 729         if (e->reason() == QContextMenuEvent::Mouse)
 730                 // the menu name is set on mouse press
 731                 name = d->context_menu_name_;
 732         else {
 733                 QPoint pos = e->pos();
 734                 Cursor const & cur = d->buffer_view_->cursor();
 735                 if (e->reason() == QContextMenuEvent::Keyboard && cur.inTexted()) {
 736                         // Do not access the context menu of math right in front of before
 737                         // the cursor. This does not work when the cursor is in text.
 738                         Inset * inset = cur.paragraph().getInset(cur.pos());
 739                         if (inset && inset->asInsetMath())
 740                                 --pos.rx();
 741                         else if (cur.pos() > 0) {
 742                                 Inset * inset = cur.paragraph().getInset(cur.pos() - 1);
 743                                 if (inset)
 744                                         ++pos.rx();
 745                         }
 746                 }
 747                 name = d->buffer_view_->contextMenu(pos.x(), pos.y());
 748         }
 749
 750         if (name.empty()) {
 751                 QAbstractScrollArea::contextMenuEvent(e);
 752                 return;
 753         }
 754         // always show mnemonics when the keyboard is used to show the context menu
 755         // FIXME: This should be fixed in Qt itself
 756         bool const keyboard = (e->reason() == QContextMenuEvent::Keyboard);
 757         QMenu * menu = guiApp->menus().menu(toqstr(name), *d->lyx_view_, keyboard);
 758         if (!menu) {
 759                 QAbstractScrollArea::contextMenuEvent(e);
 760                 return;
 761         }
 762         // Position the menu to the right.
 763         // FIXME: menu position should be different for RTL text.
 764         menu->exec(e->globalPos());
 765         e->accept();
 766 }
 767
 768
 769 void GuiWorkArea::focusInEvent(QFocusEvent * e)
 770 {
 771         LYXERR(Debug::DEBUG, "GuiWorkArea::focusInEvent(): " << this << endl);
 772         if (d->lyx_view_->currentWorkArea() != this) {
 773                 d->lyx_view_->setCurrentWorkArea(this);
 774                 d->lyx_view_->currentWorkArea()->bufferView().buffer().updateBuffer();
 775         }
 776
 777         startBlinkingCursor();
 778         QAbstractScrollArea::focusInEvent(e);
 779 }
 780
 781
 782 void GuiWorkArea::focusOutEvent(QFocusEvent * e)
 783 {
 784         LYXERR(Debug::DEBUG, "GuiWorkArea::focusOutEvent(): " << this << endl);
 785         stopBlinkingCursor();
 786         QAbstractScrollArea::focusOutEvent(e);
 787 }
 788
 789
 790 void GuiWorkArea::mousePressEvent(QMouseEvent * e)
 791 {
 792         if (d->dc_event_.active && d->dc_event_ == *e) {
 793                 d->dc_event_.active = false;
 794                 FuncRequest cmd(LFUN_MOUSE_TRIPLE, e->x(), e->y(),
 795                         q_button_state(e->button()));
 796                 d->dispatch(cmd);
 797                 e->accept();
 798                 return;
 799         }
 800
 801 #if (QT_VERSION < 0x050000)
 802         inputContext()->reset();
 803 #endif
 804
 805         FuncRequest const cmd(LFUN_MOUSE_PRESS, e->x(), e->y(),
 806                 q_button_state(e->button()));
 807         d->dispatch(cmd, q_key_state(e->modifiers()));
 808
 809         // Save the context menu on mouse press, because also the mouse
 810         // cursor is set on mouse press. Afterwards, we can either release
 811         // the mousebutton somewhere else, or the cursor might have moved
 812         // due to the DEPM. We need to do this after the mouse has been
 813         // set in dispatch(), because the selection state might change.
 814         if (e->button() == Qt::RightButton)
 815                 d->context_menu_name_ = d->buffer_view_->contextMenu(e->x(), e->y());
 816
 817         e->accept();
 818 }
 819
 820
 821 void GuiWorkArea::mouseReleaseEvent(QMouseEvent * e)
 822 {
 823         if (d->synthetic_mouse_event_.timeout.running())
 824                 d->synthetic_mouse_event_.timeout.stop();
 825
 826         FuncRequest const cmd(LFUN_MOUSE_RELEASE, e->x(), e->y(),
 827                               q_button_state(e->button()));
 828         d->dispatch(cmd);
 829         e->accept();
 830 }
 831
 832
 833 void GuiWorkArea::mouseMoveEvent(QMouseEvent * e)
 834 {
 835         // we kill the triple click if we move
 836         doubleClickTimeout();
 837         FuncRequest cmd(LFUN_MOUSE_MOTION, e->x(), e->y(),
 838                 q_motion_state(e->buttons()));
 839
 840         e->accept();
 841
 842         // If we're above or below the work area...
 843         if ((e->y() <= 20 || e->y() >= viewport()->height() - 20)
 844                         && e->buttons() == mouse_button::button1) {
 845                 // Make sure only a synthetic event can cause a page scroll,
 846                 // so they come at a steady rate:
 847                 if (e->y() <= 20)
 848                         // _Force_ a scroll up:
 849                         cmd.set_y(e->y() - 21);
 850                 else
 851                         cmd.set_y(e->y() + 21);
 852                 // Store the event, to be handled when the timeout expires.
 853                 d->synthetic_mouse_event_.cmd = cmd;
 854
 855                 if (d->synthetic_mouse_event_.timeout.running()) {
 856                         // Discard the event. Note that it _may_ be handled
 857                         // when the timeout expires if
 858                         // synthetic_mouse_event_.cmd has not been overwritten.
 859                         // Ie, when the timeout expires, we handle the
 860                         // most recent event but discard all others that
 861                         // occurred after the one used to start the timeout
 862                         // in the first place.
 863                         return;
 864                 }
 865
 866                 d->synthetic_mouse_event_.restart_timeout = true;
 867                 d->synthetic_mouse_event_.timeout.start();
 868                 // Fall through to handle this event...
 869
 870         } else if (d->synthetic_mouse_event_.timeout.running()) {
 871                 // Store the event, to be possibly handled when the timeout
 872                 // expires.
 873                 // Once the timeout has expired, normal control is returned
 874                 // to mouseMoveEvent (restart_timeout = false).
 875                 // This results in a much smoother 'feel' when moving the
 876                 // mouse back into the work area.
 877                 d->synthetic_mouse_event_.cmd = cmd;
 878                 d->synthetic_mouse_event_.restart_timeout = false;
 879                 return;
 880         }
 881         d->dispatch(cmd);
 882 }
 883
 884
 885 void GuiWorkArea::wheelEvent(QWheelEvent * ev)
 886 {
 887         // Wheel rotation by one notch results in a delta() of 120 (see
 888         // documentation of QWheelEvent)
 889         double const delta = ev->delta() / 120.0;
 890         bool zoom = false;
 891         switch (lyxrc.scroll_wheel_zoom) {
 892         case LyXRC::SCROLL_WHEEL_ZOOM_CTRL:
 893                 zoom = ev->modifiers() & Qt::ControlModifier;
 894                 zoom &= !(ev->modifiers() & (Qt::ShiftModifier | Qt::AltModifier));
 895                 break;
 896         case LyXRC::SCROLL_WHEEL_ZOOM_SHIFT:
 897                 zoom = ev->modifiers() & Qt::ShiftModifier;
 898                 zoom &= !(ev->modifiers() & (Qt::ControlModifier | Qt::AltModifier));
 899                 break;
 900         case LyXRC::SCROLL_WHEEL_ZOOM_ALT:
 901                 zoom = ev->modifiers() & Qt::AltModifier;
 902                 zoom &= !(ev->modifiers() & (Qt::ShiftModifier | Qt::ControlModifier));
 903                 break;
 904         case LyXRC::SCROLL_WHEEL_ZOOM_OFF:
 905                 break;
 906         }
 907         if (zoom) {
 908                 docstring arg = convert<docstring>(int(5 * delta));
 909                 lyx::dispatch(FuncRequest(LFUN_BUFFER_ZOOM_IN, arg));
 910                 return;
 911         }
 912
 913         // Take into account the desktop wide settings.
 914         int const lines = qApp->wheelScrollLines();
 915         int const page_step = verticalScrollBar()->pageStep();
 916         // Test if the wheel mouse is set to one screen at a time.
 917         int scroll_value = lines > page_step
 918                 ? page_step : lines * verticalScrollBar()->singleStep();
 919
 920         // Take into account the rotation and the user preferences.
 921         scroll_value = int(scroll_value * delta * lyxrc.mouse_wheel_speed);
 922         LYXERR(Debug::SCROLLING, "wheelScrollLines = " << lines
 923                         << " delta = " << delta << " scroll_value = " << scroll_value
 924                         << " page_step = " << page_step);
 925         // Now scroll.
 926         verticalScrollBar()->setValue(verticalScrollBar()->value() - scroll_value);
 927
 928         ev->accept();
 929 }
 930
 931
 932 void GuiWorkArea::generateSyntheticMouseEvent()
 933 {
 934         int const e_y = d->synthetic_mouse_event_.cmd.y();
 935         int const wh = d->buffer_view_->workHeight();
 936         bool const up = e_y < 0;
 937         bool const down = e_y > wh;
 938
 939         // Set things off to generate the _next_ 'pseudo' event.
 940         int step = 50;
 941         if (d->synthetic_mouse_event_.restart_timeout) {
 942                 // This is some magic formulae to determine the speed
 943                 // of scrolling related to the position of the mouse.
 944                 int time = 200;
 945                 if (up || down) {
 946                         int dist = up ? -e_y : e_y - wh;
 947                         time = max(min(200, 250000 / (dist * dist)), 1) ;
 948
 949                         if (time < 40) {
 950                                 step = 80000 / (time * time);
 951                                 time = 40;
 952                         }
 953                 }
 954                 d->synthetic_mouse_event_.timeout.setTimeout(time);
 955                 d->synthetic_mouse_event_.timeout.start();
 956         }
 957
 958         // Can we scroll further ?
 959         int const value = verticalScrollBar()->value();
 960         if (value == verticalScrollBar()->maximum()
 961                   || value == verticalScrollBar()->minimum()) {
 962                 d->synthetic_mouse_event_.timeout.stop();
 963                 return;
 964         }
 965
 966         // Scroll
 967         if (step <= 2 * wh) {
 968                 d->buffer_view_->scroll(up ? -step : step);
 969                 d->buffer_view_->updateMetrics();
 970         } else {
 971                 d->buffer_view_->scrollDocView(value + (up ? -step : step), false);
 972         }
 973
 974         // In which paragraph do we have to set the cursor ?
 975         Cursor & cur = d->buffer_view_->cursor();
 976         // FIXME: we don't know howto handle math.
 977         Text * text = cur.text();
 978         if (!text)
 979                 return;
 980         TextMetrics const & tm = d->buffer_view_->textMetrics(text);
 981
 982         pair<pit_type, const ParagraphMetrics *> pp = up ? tm.first() : tm.last();
 983         ParagraphMetrics const & pm = *pp.second;
 984         pit_type const pit = pp.first;
 985
 986         if (pm.rows().empty())
 987                 return;
 988
 989         // Find the row at which we set the cursor.
 990         RowList::const_iterator rit = pm.rows().begin();
 991         RowList::const_iterator rlast = pm.rows().end();
 992         int yy = pm.position() - pm.ascent();
 993         for (--rlast; rit != rlast; ++rit) {
 994                 int h = rit->height();
 995                 if ((up && yy + h > 0)
 996                           || (!up && yy + h > wh - defaultRowHeight()))
 997                         break;
 998                 yy += h;
 999         }
1000
1001         // Find the position of the cursor
1002         bool bound;
1003         int x = d->synthetic_mouse_event_.cmd.x();
1004         pos_type const pos = rit->pos() + tm.getColumnNearX(pit, *rit, x, bound);
1005
1006         // Set the cursor
1007         cur.pit() = pit;
1008         cur.pos() = pos;
1009         cur.boundary(bound);
1010
1011         d->buffer_view_->buffer().changed(false);
1012         return;
1013 }
1014
1015
1016 void GuiWorkArea::keyPressEvent(QKeyEvent * ev)
1017 {
1018         // Do not process here some keys if dialog_mode_ is set
1019         if (d->dialog_mode_
1020                 && (ev->modifiers() == Qt::NoModifier
1021                     || ev->modifiers() == Qt::ShiftModifier)
1022                 && (ev->key() == Qt::Key_Escape
1023                     || ev->key() == Qt::Key_Enter
1024                     || ev->key() == Qt::Key_Return)
1025             ) {
1026                 ev->ignore();
1027                 return;
1028         }
1029
1030         // intercept some keys if completion popup is visible
1031         if (d->completer_->popupVisible()) {
1032                 switch (ev->key()) {
1033                 case Qt::Key_Enter:
1034                 case Qt::Key_Return:
1035                         d->completer_->activate();
1036                         ev->accept();
1037                         return;
1038                 }
1039         }
1040
1041         // do nothing if there are other events
1042         // (the auto repeated events come too fast)
1043         // it looks like this is only needed on X11
1044 #ifdef Q_WS_X11
1045         if (qApp->hasPendingEvents() && ev->isAutoRepeat()) {
1046                 switch (ev->key()) {
1047                 case Qt::Key_PageDown:
1048                 case Qt::Key_PageUp:
1049                 case Qt::Key_Left:
1050                 case Qt::Key_Right:
1051                 case Qt::Key_Up:
1052                 case Qt::Key_Down:
1053                         LYXERR(Debug::KEY, "system is busy: scroll key event ignored");
1054                         ev->ignore();
1055                         return;
1056                 }
1057         }
1058 #endif
1059
1060         KeyModifier m = q_key_state(ev->modifiers());
1061
1062         std::string str;
1063         if (m & ShiftModifier)
1064                 str += "Shift-";
1065         if (m & ControlModifier)
1066                 str += "Control-";
1067         if (m & AltModifier)
1068                 str += "Alt-";
1069         if (m & MetaModifier)
1070                 str += "Meta-";
1071
1072         LYXERR(Debug::KEY, " count: " << ev->count() << " text: " << ev->text()
1073                 << " isAutoRepeat: " << ev->isAutoRepeat() << " key: " << ev->key()
1074                 << " keyState: " << str);
1075
1076         KeySymbol sym;
1077         setKeySymbol(&sym, ev);
1078         if (sym.isOK()) {
1079                 processKeySym(sym, q_key_state(ev->modifiers()));
1080                 ev->accept();
1081         } else {
1082                 ev->ignore();
1083         }
1084 }
1085
1086
1087 void GuiWorkArea::doubleClickTimeout()
1088 {
1089         d->dc_event_.active = false;
1090 }
1091
1092
1093 void GuiWorkArea::mouseDoubleClickEvent(QMouseEvent * ev)
1094 {
1095         d->dc_event_ = DoubleClick(ev);
1096         QTimer::singleShot(QApplication::doubleClickInterval(), this,
1097                            SLOT(doubleClickTimeout()));
1098         FuncRequest cmd(LFUN_MOUSE_DOUBLE,
1099                         ev->x(), ev->y(),
1100                         q_button_state(ev->button()));
1101         d->dispatch(cmd);
1102         ev->accept();
1103 }
1104
1105
1106 void GuiWorkArea::resizeEvent(QResizeEvent * ev)
1107 {
1108         QAbstractScrollArea::resizeEvent(ev);
1109         d->need_resize_ = true;
1110         ev->accept();
1111 }
1112
1113
1114 void GuiWorkArea::Private::update(int x, int y, int w, int h)
1115 {
1116         p->viewport()->update(x, y, w, h);
1117 }
1118
1119
1120 void GuiWorkArea::paintEvent(QPaintEvent * ev)
1121 {
1122         QRect const rc = ev->rect();
1123         // LYXERR(Debug::PAINTING, "paintEvent begin: x: " << rc.x()
1124         //      << " y: " << rc.y() << " w: " << rc.width() << " h: " << rc.height());
1125
1126         if (d->need_resize_) {
1127                 d->resetScreen();
1128                 d->resizeBufferView();
1129                 if (d->cursor_visible_) {
1130                         d->hideCursor();
1131                         d->showCursor();
1132                 }
1133         }
1134
1135         QPainter pain(viewport());
1136         if (lyxrc.use_qimage) {
1137                 pain.drawImage(rc, static_cast<QImage const &>(*d->screen_), rc);
1138         } else {
1139                 pain.drawPixmap(rc, static_cast<QPixmap const &>(*d->screen_), rc);
1140         }
1141         d->cursor_->draw(pain);
1142         ev->accept();
1143 }
1144
1145
1146 void GuiWorkArea::Private::updateScreen()
1147 {
1148         GuiPainter pain(screen_);
1149         buffer_view_->draw(pain);
1150 }
1151
1152
1153 void GuiWorkArea::Private::showCursor(int x, int y, int h,
1154         bool l_shape, bool rtl, bool completable)
1155 {
1156         if (schedule_redraw_) {
1157                 // This happens when a graphic conversion is finished. As we don't know
1158                 // the size of the new graphics, it's better the update everything.
1159                 // We can't use redraw() here because this would trigger a infinite
1160                 // recursive loop with showCursor().
1161                 buffer_view_->resize(p->viewport()->width(), p->viewport()->height());
1162                 updateScreen();
1163                 updateScrollbar();
1164                 p->viewport()->update(QRect(0, 0, p->viewport()->width(), p->viewport()->height()));
1165                 schedule_redraw_ = false;
1166                 // Show the cursor immediately after the update.
1167                 hideCursor();
1168                 p->toggleCursor();
1169                 return;
1170         }
1171
1172         cursor_->update(x, y, h, l_shape, rtl, completable);
1173         cursor_->show();
1174         p->viewport()->update(cursor_->rect());
1175 }
1176
1177
1178 void GuiWorkArea::Private::removeCursor()
1179 {
1180         cursor_->hide();
1181         //if (!qApp->focusWidget())
1182                 p->viewport()->update(cursor_->rect());
1183 }
1184
1185
1186 void GuiWorkArea::inputMethodEvent(QInputMethodEvent * e)
1187 {
1188         QString const & commit_string = e->commitString();
1189         docstring const & preedit_string
1190                 = qstring_to_ucs4(e->preeditString());
1191
1192         if (!commit_string.isEmpty()) {
1193
1194                 LYXERR(Debug::KEY, "preeditString: " << e->preeditString()
1195                         << " commitString: " << e->commitString());
1196
1197                 int key = 0;
1198
1199                 // FIXME Iwami 04/01/07: we should take care also of UTF16 surrogates here.
1200                 for (int i = 0; i != commit_string.size(); ++i) {
1201                         QKeyEvent ev(QEvent::KeyPress, key, Qt::NoModifier, commit_string[i]);
1202                         keyPressEvent(&ev);
1203                 }
1204         }
1205
1206         // Hide the cursor during the kana-kanji transformation.
1207         if (preedit_string.empty())
1208                 startBlinkingCursor();
1209         else
1210                 stopBlinkingCursor();
1211
1212         // last_width : for checking if last preedit string was/wasn't empty.
1213         // FIXME THREAD
1214         // We could have more than one work area, right?
1215         static bool last_width = false;
1216         if (!last_width && preedit_string.empty()) {
1217                 // if last_width is last length of preedit string.
1218                 e->accept();
1219                 return;
1220         }
1221
1222         GuiPainter pain(d->screen_);
1223         d->buffer_view_->updateMetrics();
1224         d->buffer_view_->draw(pain);
1225         FontInfo font = d->buffer_view_->cursor().getFont().fontInfo();
1226         FontMetrics const & fm = theFontMetrics(font);
1227         int height = fm.maxHeight();
1228         int cur_x = d->cursor_->rect().left();
1229         int cur_y = d->cursor_->rect().bottom();
1230
1231         // redraw area of preedit string.
1232         update(0, cur_y - height, viewport()->width(),
1233                 (height + 1) * d->preedit_lines_);
1234
1235         if (preedit_string.empty()) {
1236                 last_width = false;
1237                 d->preedit_lines_ = 1;
1238                 e->accept();
1239                 return;
1240         }
1241         last_width = true;
1242
1243         // att : stores an IM attribute.
1244         QList<QInputMethodEvent::Attribute> const & att = e->attributes();
1245
1246         // get attributes of input method cursor.
1247         // cursor_pos : cursor position in preedit string.
1248         size_t cursor_pos = 0;
1249         bool cursor_is_visible = false;
1250         for (int i = 0; i != att.size(); ++i) {
1251                 if (att.at(i).type == QInputMethodEvent::Cursor) {
1252                         cursor_pos = att.at(i).start;
1253                         cursor_is_visible = att.at(i).length != 0;
1254                         break;
1255                 }
1256         }
1257
1258         size_t preedit_length = preedit_string.length();
1259
1260         // get position of selection in input method.
1261         // FIXME: isn't there a way to do this simplier?
1262         // rStart : cursor position in selected string in IM.
1263         size_t rStart = 0;
1264         // rLength : selected string length in IM.
1265         size_t rLength = 0;
1266         if (cursor_pos < preedit_length) {
1267                 for (int i = 0; i != att.size(); ++i) {
1268                         if (att.at(i).type == QInputMethodEvent::TextFormat) {
1269                                 if (att.at(i).start <= int(cursor_pos)
1270                                         && int(cursor_pos) < att.at(i).start + att.at(i).length) {
1271                                                 rStart = att.at(i).start;
1272                                                 rLength = att.at(i).length;
1273                                                 if (!cursor_is_visible)
1274                                                         cursor_pos += rLength;
1275                                                 break;
1276                                 }
1277                         }
1278                 }
1279         }
1280         else {
1281                 rStart = cursor_pos;
1282                 rLength = 0;
1283         }
1284
1285         int const right_margin = d->buffer_view_->rightMargin();
1286         Painter::preedit_style ps;
1287         // Most often there would be only one line:
1288         d->preedit_lines_ = 1;
1289         for (size_t pos = 0; pos != preedit_length; ++pos) {
1290                 char_type const typed_char = preedit_string[pos];
1291                 // reset preedit string style
1292                 ps = Painter::preedit_default;
1293
1294                 // if we reached the right extremity of the screen, go to next line.
1295                 if (cur_x + fm.width(typed_char) > viewport()->width() - right_margin) {
1296                         cur_x = right_margin;
1297                         cur_y += height + 1;
1298                         ++d->preedit_lines_;
1299                 }
1300                 // preedit strings are displayed with dashed underline
1301                 // and partial strings are displayed white on black indicating
1302                 // that we are in selecting mode in the input method.
1303                 // FIXME: rLength == preedit_length is not a changing condition
1304                 // FIXME: should be put out of the loop.
1305                 if (pos >= rStart
1306                         && pos < rStart + rLength
1307                         && !(cursor_pos < rLength && rLength == preedit_length))
1308                         ps = Painter::preedit_selecting;
1309
1310                 if (pos == cursor_pos
1311                         && (cursor_pos < rLength && rLength == preedit_length))
1312                         ps = Painter::preedit_cursor;
1313
1314                 // draw one character and update cur_x.
1315                 cur_x += pain.preeditText(cur_x, cur_y, typed_char, font, ps);
1316         }
1317
1318         // update the preedit string screen area.
1319         update(0, cur_y - d->preedit_lines_*height, viewport()->width(),
1320                 (height + 1) * d->preedit_lines_);
1321
1322         // Don't forget to accept the event!
1323         e->accept();
1324 }
1325
1326
1327 QVariant GuiWorkArea::inputMethodQuery(Qt::InputMethodQuery query) const
1328 {
1329         QRect cur_r(0, 0, 0, 0);
1330         switch (query) {
1331                 // this is the CJK-specific composition window position and
1332                 // the context menu position when the menu key is pressed.
1333                 case Qt::ImMicroFocus:
1334                         cur_r = d->cursor_->rect();
1335                         if (d->preedit_lines_ != 1)
1336                                 cur_r.moveLeft(10);
1337                         cur_r.moveBottom(cur_r.bottom()
1338                                 + cur_r.height() * (d->preedit_lines_ - 1));
1339                         // return lower right of cursor in LyX.
1340                         return cur_r;
1341                 default:
1342                         return QWidget::inputMethodQuery(query);
1343         }
1344 }
1345
1346
1347 void GuiWorkArea::updateWindowTitle()
1348 {
1349         docstring maximize_title;
1350         docstring minimize_title;
1351
1352         Buffer const & buf = d->buffer_view_->buffer();
1353         FileName const file_name = buf.fileName();
1354         if (!file_name.empty()) {
1355                 maximize_title = file_name.displayName(130);
1356                 minimize_title = from_utf8(file_name.onlyFileName());
1357                 if (buf.lyxvc().inUse()) {
1358                         if (buf.lyxvc().locking())
1359                                 maximize_title +=  _(" (version control, locking)");
1360                         else
1361                                 maximize_title +=  _(" (version control)");
1362                 }
1363                 if (!buf.isClean()) {
1364                         maximize_title += _(" (changed)");
1365                         minimize_title += char_type('*');
1366                 }
1367                 if (buf.isReadonly())
1368                         maximize_title += _(" (read only)");
1369         }
1370
1371         QString const new_title = toqstr(maximize_title);
1372         if (new_title != windowTitle()) {
1373                 QWidget::setWindowTitle(new_title);
1374                 QWidget::setWindowIconText(toqstr(minimize_title));
1375                 titleChanged(this);
1376         }
1377 }
1378
1379
1380 bool GuiWorkArea::isFullScreen() const
1381 {
1382         return d->lyx_view_ && d->lyx_view_->isFullScreen();
1383 }
1384
1385
1386 void GuiWorkArea::scheduleRedraw()
1387 {
1388         d->schedule_redraw_ = true;
1389 }
1390
1391
1392 bool GuiWorkArea::inDialogMode() const
1393 {
1394         return d->dialog_mode_;
1395 }
1396
1397
1398 void GuiWorkArea::setDialogMode(bool mode)
1399 {
1400         d->dialog_mode_ = mode;
1401 }
1402
1403
1404 GuiCompleter & GuiWorkArea::completer()
1405 {
1406         return *d->completer_;
1407 }
1408
1409 GuiView const & GuiWorkArea::view() const
1410 {
1411         return *d->lyx_view_;
1412 }
1413
1414
1415 GuiView & GuiWorkArea::view()
1416 {
1417         return *d->lyx_view_;
1418 }
1419
1420 ////////////////////////////////////////////////////////////////////
1421 //
1422 // EmbeddedWorkArea
1423 //
1424 ////////////////////////////////////////////////////////////////////
1425
1426
1427 EmbeddedWorkArea::EmbeddedWorkArea(QWidget * w): GuiWorkArea(w)
1428 {
1429         buffer_ = theBufferList().newInternalBuffer(
1430                 support::FileName::tempName("embedded.internal").absFileName());
1431         buffer_->setUnnamed(true);
1432         buffer_->setFullyLoaded(true);
1433         setBuffer(*buffer_);
1434         setDialogMode(true);
1435 }
1436
1437
1438 EmbeddedWorkArea::~EmbeddedWorkArea()
1439 {
1440         // No need to destroy buffer and bufferview here, because it is done
1441         // in theBufferList() destruction loop at application exit
1442 }
1443
1444
1445 void EmbeddedWorkArea::closeEvent(QCloseEvent * ev)
1446 {
1447         disable();
1448         GuiWorkArea::closeEvent(ev);
1449 }
1450
1451
1452 void EmbeddedWorkArea::hideEvent(QHideEvent * ev)
1453 {
1454         disable();
1455         GuiWorkArea::hideEvent(ev);
1456 }
1457
1458
1459 QSize EmbeddedWorkArea::sizeHint () const
1460 {
1461         // FIXME(?):
1462         // GuiWorkArea sets the size to the screen's viewport
1463         // by returning a value this gets overridden
1464         // EmbeddedWorkArea is now sized to fit in the layout
1465         // of the parent, and has a minimum size set in GuiWorkArea
1466         // which is what we return here
1467         return QSize(100, 70);
1468 }
1469
1470
1471 void EmbeddedWorkArea::disable()
1472 {
1473         stopBlinkingCursor();
1474         if (view().currentWorkArea() != this)
1475                 return;
1476         // No problem if currentMainWorkArea() is 0 (setCurrentWorkArea()
1477         // tolerates it and shows the background logo), what happens if
1478         // an EmbeddedWorkArea is closed after closing all document WAs
1479         view().setCurrentWorkArea(view().currentMainWorkArea());
1480 }
1481
1482 ////////////////////////////////////////////////////////////////////
1483 //
1484 // TabWorkArea
1485 //
1486 ////////////////////////////////////////////////////////////////////
1487
1488 #ifdef Q_WS_MACX
1489 class NoTabFrameMacStyle : public QMacStyle {
1490 public:
1491         ///
1492         QRect subElementRect(SubElement element, const QStyleOption * option,
1493                              const QWidget * widget = 0) const
1494         {
1495                 QRect rect = QMacStyle::subElementRect(element, option, widget);
1496                 bool noBar = static_cast<QTabWidget const *>(widget)->count() <= 1;
1497
1498                 // The Qt Mac style puts the contents into a 3 pixel wide box
1499                 // which looks very ugly and not like other Mac applications.
1500                 // Hence we remove this here, and moreover the 16 pixel round
1501                 // frame above if the tab bar is hidden.
1502                 if (element == QStyle::SE_TabWidgetTabContents) {
1503                         rect.adjust(- rect.left(), 0, rect.left(), 0);
1504                         if (noBar)
1505                                 rect.setTop(0);
1506                 }
1507
1508                 return rect;
1509         }
1510 };
1511
1512 NoTabFrameMacStyle noTabFrameMacStyle;
1513 #endif
1514
1515
1516 TabWorkArea::TabWorkArea(QWidget * parent)
1517         : QTabWidget(parent), clicked_tab_(-1)
1518 {
1519 #ifdef Q_WS_MACX
1520         setStyle(&noTabFrameMacStyle);
1521 #endif
1522
1523         QPalette pal = palette();
1524         pal.setColor(QPalette::Active, QPalette::Button,
1525                 pal.color(QPalette::Active, QPalette::Window));
1526         pal.setColor(QPalette::Disabled, QPalette::Button,
1527                 pal.color(QPalette::Disabled, QPalette::Window));
1528         pal.setColor(QPalette::Inactive, QPalette::Button,
1529                 pal.color(QPalette::Inactive, QPalette::Window));
1530
1531         QObject::connect(this, SIGNAL(currentChanged(int)),
1532                 this, SLOT(on_currentTabChanged(int)));
1533
1534         closeBufferButton = new QToolButton(this);
1535         closeBufferButton->setPalette(pal);
1536         // FIXME: rename the icon to closebuffer.png
1537         closeBufferButton->setIcon(QIcon(getPixmap("images/", "closetab", "png")));
1538         closeBufferButton->setText("Close File");
1539         closeBufferButton->setAutoRaise(true);
1540         closeBufferButton->setCursor(Qt::ArrowCursor);
1541         closeBufferButton->setToolTip(qt_("Close File"));
1542         closeBufferButton->setEnabled(true);
1543         QObject::connect(closeBufferButton, SIGNAL(clicked()),
1544                 this, SLOT(closeCurrentBuffer()));
1545         setCornerWidget(closeBufferButton, Qt::TopRightCorner);
1546
1547         // setup drag'n'drop
1548         QTabBar* tb = new DragTabBar;
1549         connect(tb, SIGNAL(tabMoveRequested(int, int)),
1550                 this, SLOT(moveTab(int, int)));
1551         tb->setElideMode(Qt::ElideNone);
1552         setTabBar(tb);
1553
1554         // make us responsible for the context menu of the tabbar
1555         tb->setContextMenuPolicy(Qt::CustomContextMenu);
1556         connect(tb, SIGNAL(customContextMenuRequested(const QPoint &)),
1557                 this, SLOT(showContextMenu(const QPoint &)));
1558         connect(tb, SIGNAL(tabCloseRequested(int)),
1559                 this, SLOT(closeTab(int)));
1560
1561         setUsesScrollButtons(true);
1562 }
1563
1564
1565 void TabWorkArea::paintEvent(QPaintEvent * event)
1566 {
1567         if (tabBar()->isVisible()) {
1568                 QTabWidget::paintEvent(event);
1569         } else {
1570                 // Prevent the selected tab to influence the
1571                 // painting of the frame of the tab widget.
1572                 // This is needed for gtk style in Qt.
1573                 QStylePainter p(this);
1574 #if QT_VERSION < 0x050000
1575                 QStyleOptionTabWidgetFrameV2 opt;
1576 #else
1577                 QStyleOptionTabWidgetFrame opt;
1578 #endif
1579                 initStyleOption(&opt);
1580                 opt.rect = style()->subElementRect(QStyle::SE_TabWidgetTabPane,
1581                         &opt, this);
1582                 opt.selectedTabRect = QRect();
1583                 p.drawPrimitive(QStyle::PE_FrameTabWidget, opt);
1584         }
1585 }
1586
1587
1588 void TabWorkArea::mouseDoubleClickEvent(QMouseEvent * event)
1589 {
1590         if (event->button() != Qt::LeftButton)
1591                 return;
1592
1593         // return early if double click on existing tabs
1594         for (int i = 0; i < count(); ++i)
1595                 if (tabBar()->tabRect(i).contains(event->pos()))
1596                         return;
1597
1598         dispatch(FuncRequest(LFUN_BUFFER_NEW));
1599 }
1600
1601
1602 void TabWorkArea::setFullScreen(bool full_screen)
1603 {
1604         for (int i = 0; i != count(); ++i) {
1605                 if (GuiWorkArea * wa = workArea(i))
1606                         wa->setFullScreen(full_screen);
1607         }
1608
1609         if (lyxrc.full_screen_tabbar)
1610                 showBar(!full_screen && count() > 1);
1611         else
1612                 showBar(count() > 1);
1613 }
1614
1615
1616 void TabWorkArea::showBar(bool show)
1617 {
1618         tabBar()->setEnabled(show);
1619         tabBar()->setVisible(show);
1620         closeBufferButton->setVisible(show && lyxrc.single_close_tab_button);
1621         setTabsClosable(!lyxrc.single_close_tab_button);
1622 }
1623
1624
1625 GuiWorkArea * TabWorkArea::currentWorkArea()
1626 {
1627         if (count() == 0)
1628                 return 0;
1629
1630         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(currentWidget());
1631         LATTEST(wa);
1632         return wa;
1633 }
1634
1635
1636 GuiWorkArea * TabWorkArea::workArea(int index)
1637 {
1638         return dynamic_cast<GuiWorkArea *>(widget(index));
1639 }
1640
1641
1642 GuiWorkArea * TabWorkArea::workArea(Buffer & buffer)
1643 {
1644         // FIXME: this method doesn't work if we have more than work area
1645         // showing the same buffer.
1646         for (int i = 0; i != count(); ++i) {
1647                 GuiWorkArea * wa = workArea(i);
1648                 LASSERT(wa, return 0);
1649                 if (&wa->bufferView().buffer() == &buffer)
1650                         return wa;
1651         }
1652         return 0;
1653 }
1654
1655
1656 void TabWorkArea::closeAll()
1657 {
1658         while (count()) {
1659                 GuiWorkArea * wa = workArea(0);
1660                 LASSERT(wa, return);
1661                 removeTab(0);
1662                 delete wa;
1663         }
1664 }
1665
1666
1667 bool TabWorkArea::setCurrentWorkArea(GuiWorkArea * work_area)
1668 {
1669         LASSERT(work_area, return false);
1670         int index = indexOf(work_area);
1671         if (index == -1)
1672                 return false;
1673
1674         if (index == currentIndex())
1675                 // Make sure the work area is up to date.
1676                 on_currentTabChanged(index);
1677         else
1678                 // Switch to the work area.
1679                 setCurrentIndex(index);
1680         work_area->setFocus();
1681
1682         return true;
1683 }
1684
1685
1686 GuiWorkArea * TabWorkArea::addWorkArea(Buffer & buffer, GuiView & view)
1687 {
1688         GuiWorkArea * wa = new GuiWorkArea(buffer, view);
1689         wa->setUpdatesEnabled(false);
1690         // Hide tabbar if there's no tab (avoid a resize and a flashing tabbar
1691         // when hiding it again below).
1692         if (!(currentWorkArea() && currentWorkArea()->isFullScreen()))
1693                 showBar(count() > 0);
1694         addTab(wa, wa->windowTitle());
1695         QObject::connect(wa, SIGNAL(titleChanged(GuiWorkArea *)),
1696                 this, SLOT(updateTabTexts()));
1697         if (currentWorkArea() && currentWorkArea()->isFullScreen())
1698                 setFullScreen(true);
1699         else
1700                 // Hide tabbar if there's only one tab.
1701                 showBar(count() > 1);
1702
1703         updateTabTexts();
1704
1705         return wa;
1706 }
1707
1708
1709 bool TabWorkArea::removeWorkArea(GuiWorkArea * work_area)
1710 {
1711         LASSERT(work_area, return false);
1712         int index = indexOf(work_area);
1713         if (index == -1)
1714                 return false;
1715
1716         work_area->setUpdatesEnabled(false);
1717         removeTab(index);
1718         delete work_area;
1719
1720         if (count()) {
1721                 // make sure the next work area is enabled.
1722                 currentWidget()->setUpdatesEnabled(true);
1723                 if (currentWorkArea() && currentWorkArea()->isFullScreen())
1724                         setFullScreen(true);
1725                 else
1726                         // Show tabbar only if there's more than one tab.
1727                         showBar(count() > 1);
1728         } else
1729                 lastWorkAreaRemoved();
1730
1731         updateTabTexts();
1732
1733         return true;
1734 }
1735
1736
1737 void TabWorkArea::on_currentTabChanged(int i)
1738 {
1739         // returns e.g. on application destruction
1740         if (i == -1)
1741                 return;
1742         GuiWorkArea * wa = workArea(i);
1743         LASSERT(wa, return);
1744         wa->setUpdatesEnabled(true);
1745         wa->redraw(true);
1746         wa->setFocus();
1747         ///
1748         currentWorkAreaChanged(wa);
1749
1750         LYXERR(Debug::GUI, "currentTabChanged " << i
1751                 << " File: " << wa->bufferView().buffer().absFileName());
1752 }
1753
1754
1755 void TabWorkArea::closeCurrentBuffer()
1756 {
1757         GuiWorkArea * wa;
1758         if (clicked_tab_ == -1)
1759                 wa = currentWorkArea();
1760         else {
1761                 wa = workArea(clicked_tab_);
1762                 LASSERT(wa, return);
1763         }
1764         wa->view().closeWorkArea(wa);
1765 }
1766
1767
1768 void TabWorkArea::hideCurrentTab()
1769 {
1770         GuiWorkArea * wa;
1771         if (clicked_tab_ == -1)
1772                 wa = currentWorkArea();
1773         else {
1774                 wa = workArea(clicked_tab_);
1775                 LASSERT(wa, return);
1776         }
1777         wa->view().hideWorkArea(wa);
1778 }
1779
1780
1781 void TabWorkArea::closeTab(int index)
1782 {
1783         on_currentTabChanged(index);
1784         GuiWorkArea * wa;
1785         if (index == -1)
1786                 wa = currentWorkArea();
1787         else {
1788                 wa = workArea(index);
1789                 LASSERT(wa, return);
1790         }
1791         wa->view().closeWorkArea(wa);
1792 }
1793
1794
1795 ///
1796 class DisplayPath {
1797 public:
1798         /// make vector happy
1799         DisplayPath() {}
1800         ///
1801         DisplayPath(int tab, FileName const & filename)
1802                 : tab_(tab)
1803         {
1804                 filename_ = (filename.extension() == "lyx") ?
1805                         toqstr(filename.onlyFileNameWithoutExt())
1806                         : toqstr(filename.onlyFileName());
1807                 postfix_ = toqstr(filename.absoluteFilePath()).
1808                         split("/", QString::SkipEmptyParts);
1809                 postfix_.pop_back();
1810                 abs_ = toqstr(filename.absoluteFilePath());
1811                 dottedPrefix_ = false;
1812         }
1813
1814         /// Absolute path for debugging.
1815         QString abs() const
1816         {
1817                 return abs_;
1818         }
1819         /// Add the first segment from the postfix or three dots to the prefix.
1820         /// Merge multiple dot tripples. In fact dots are added lazily, i.e. only
1821         /// when really needed.
1822         void shiftPathSegment(bool dotted)
1823         {
1824                 if (postfix_.count() <= 0)
1825                         return;
1826
1827                 if (!dotted) {
1828                         if (dottedPrefix_ && !prefix_.isEmpty())
1829                                 prefix_ += ".../";
1830                         prefix_ += postfix_.front() + "/";
1831                 }
1832                 dottedPrefix_ = dotted && !prefix_.isEmpty();
1833                 postfix_.pop_front();
1834         }
1835         ///
1836         QString displayString() const
1837         {
1838                 if (prefix_.isEmpty())
1839                         return filename_;
1840
1841                 bool dots = dottedPrefix_ || !postfix_.isEmpty();
1842                 return prefix_ + (dots ? ".../" : "") + filename_;
1843         }
1844         ///
1845         QString forecastPathString() const
1846         {
1847                 if (postfix_.count() == 0)
1848                         return displayString();
1849
1850                 return prefix_
1851                         + (dottedPrefix_ ? ".../" : "")
1852                         + postfix_.front() + "/";
1853         }
1854         ///
1855         bool final() const { return postfix_.empty(); }
1856         ///
1857         int tab() const { return tab_; }
1858
1859 private:
1860         ///
1861         QString prefix_;
1862         ///
1863         QStringList postfix_;
1864         ///
1865         QString filename_;
1866         ///
1867         QString abs_;
1868         ///
1869         int tab_;
1870         ///
1871         bool dottedPrefix_;
1872 };
1873
1874
1875 ///
1876 bool operator<(DisplayPath const & a, DisplayPath const & b)
1877 {
1878         return a.displayString() < b.displayString();
1879 }
1880
1881 ///
1882 bool operator==(DisplayPath const & a, DisplayPath const & b)
1883 {
1884         return a.displayString() == b.displayString();
1885 }
1886
1887
1888 void TabWorkArea::updateTabTexts()
1889 {
1890         size_t n = count();
1891         if (n == 0)
1892                 return;
1893         std::list<DisplayPath> paths;
1894         typedef std::list<DisplayPath>::iterator It;
1895
1896         // collect full names first: path into postfix, empty prefix and
1897         // filename without extension
1898         for (size_t i = 0; i < n; ++i) {
1899                 GuiWorkArea * i_wa = workArea(i);
1900                 FileName const fn = i_wa->bufferView().buffer().fileName();
1901                 paths.push_back(DisplayPath(i, fn));
1902         }
1903
1904         // go through path segments and see if it helps to make the path more unique
1905         bool somethingChanged = true;
1906         bool allFinal = false;
1907         while (somethingChanged && !allFinal) {
1908                 // adding path segments changes order
1909                 paths.sort();
1910
1911                 LYXERR(Debug::GUI, "updateTabTexts() iteration start");
1912                 somethingChanged = false;
1913                 allFinal = true;
1914
1915                 // find segments which are not unique (i.e. non-atomic)
1916                 It it = paths.begin();
1917                 It segStart = it;
1918                 QString segString = it->displayString();
1919                 for (; it != paths.end(); ++it) {
1920                         // look to the next item
1921                         It next = it;
1922                         ++next;
1923
1924                         // final?
1925                         allFinal = allFinal && it->final();
1926
1927                         LYXERR(Debug::GUI, "it = " << it->abs()
1928                                << " => " << it->displayString());
1929
1930                         // still the same segment?
1931                         QString nextString;
1932                         if ((next != paths.end()
1933                              && (nextString = next->displayString()) == segString))
1934                                 continue;
1935                         LYXERR(Debug::GUI, "segment ended");
1936
1937                         // only a trivial one with one element?
1938                         if (it == segStart) {
1939                                 // start new segment
1940                                 segStart = next;
1941                                 segString = nextString;
1942                                 continue;
1943                         }
1944
1945                         // we found a non-atomic segment segStart <= sit <= it < next.
1946                         // Shift path segments and hope for the best
1947                         // that it makes the path more unique.
1948                         somethingChanged = true;
1949                         It sit = segStart;
1950                         QString dspString = sit->forecastPathString();
1951                         LYXERR(Debug::GUI, "first forecast found for "
1952                                << sit->abs() << " => " << dspString);
1953                         ++sit;
1954                         bool moreUnique = false;
1955                         for (; sit != next; ++sit) {
1956                                 if (sit->forecastPathString() != dspString) {
1957                                         LYXERR(Debug::GUI, "different forecast found for "
1958                                                 << sit->abs() << " => " << sit->forecastPathString());
1959                                         moreUnique = true;
1960                                         break;
1961                                 }
1962                                 LYXERR(Debug::GUI, "same forecast found for "
1963                                         << sit->abs() << " => " << dspString);
1964                         }
1965
1966                         // if the path segment helped, add it. Otherwise add dots
1967                         bool dots = !moreUnique;
1968                         LYXERR(Debug::GUI, "using dots = " << dots);
1969                         for (sit = segStart; sit != next; ++sit) {
1970                                 sit->shiftPathSegment(dots);
1971                                 LYXERR(Debug::GUI, "shifting "
1972                                         << sit->abs() << " => " << sit->displayString());
1973                         }
1974
1975                         // start new segment
1976                         segStart = next;
1977                         segString = nextString;
1978                 }
1979         }
1980
1981         // set new tab titles
1982         for (It it = paths.begin(); it != paths.end(); ++it) {
1983                 int const tab_index = it->tab();
1984                 Buffer const & buf = workArea(tab_index)->bufferView().buffer();
1985                 QString tab_text = it->displayString().replace("&", "&&");
1986                 if (!buf.fileName().empty() && !buf.isClean())
1987                         tab_text += "*";
1988                 setTabText(tab_index, tab_text);
1989                 setTabToolTip(tab_index, it->abs());
1990         }
1991 }
1992
1993
1994 void TabWorkArea::showContextMenu(const QPoint & pos)
1995 {
1996         // which tab?
1997         clicked_tab_ = static_cast<DragTabBar *>(tabBar())->tabAt(pos);
1998         if (clicked_tab_ == -1)
1999                 return;
2000
2001         // show tab popup
2002         QMenu popup;
2003         popup.addAction(QIcon(getPixmap("images/", "hidetab", "png")),
2004                 qt_("Hide tab"), this, SLOT(hideCurrentTab()));
2005         popup.addAction(QIcon(getPixmap("images/", "closetab", "png")),
2006                 qt_("Close tab"), this, SLOT(closeCurrentBuffer()));
2007         popup.exec(tabBar()->mapToGlobal(pos));
2008
2009         clicked_tab_ = -1;
2010 }
2011
2012
2013 void TabWorkArea::moveTab(int fromIndex, int toIndex)
2014 {
2015         QWidget * w = widget(fromIndex);
2016         QIcon icon = tabIcon(fromIndex);
2017         QString text = tabText(fromIndex);
2018
2019         setCurrentIndex(fromIndex);
2020         removeTab(fromIndex);
2021         insertTab(toIndex, w, icon, text);
2022         setCurrentIndex(toIndex);
2023 }
2024
2025
2026 DragTabBar::DragTabBar(QWidget* parent)
2027         : QTabBar(parent)
2028 {
2029         setAcceptDrops(true);
2030         setTabsClosable(!lyxrc.single_close_tab_button);
2031 }
2032
2033
2034 void DragTabBar::mousePressEvent(QMouseEvent * event)
2035 {
2036         if (event->button() == Qt::LeftButton)
2037                 dragStartPos_ = event->pos();
2038         QTabBar::mousePressEvent(event);
2039 }
2040
2041
2042 void DragTabBar::mouseMoveEvent(QMouseEvent * event)
2043 {
2044         // If the left button isn't pressed anymore then return
2045         if (!(event->buttons() & Qt::LeftButton))
2046                 return;
2047
2048         // If the distance is too small then return
2049         if ((event->pos() - dragStartPos_).manhattanLength()
2050             < QApplication::startDragDistance())
2051                 return;
2052
2053         // did we hit something after all?
2054         int tab = tabAt(dragStartPos_);
2055         if (tab == -1)
2056                 return;
2057
2058         // simulate button release to remove highlight from button
2059         int i = currentIndex();
2060         QMouseEvent me(QEvent::MouseButtonRelease, dragStartPos_,
2061                 event->button(), event->buttons(), 0);
2062         QTabBar::mouseReleaseEvent(&me);
2063         setCurrentIndex(i);
2064
2065         // initiate Drag
2066         QDrag * drag = new QDrag(this);
2067         QMimeData * mimeData = new QMimeData;
2068         // a crude way to distinguish tab-reodering drops from other ones
2069         mimeData->setData("action", "tab-reordering") ;
2070         drag->setMimeData(mimeData);
2071
2072         // get tab pixmap as cursor
2073         QRect r = tabRect(tab);
2074         QPixmap pixmap(r.size());
2075         render(&pixmap, - r.topLeft());
2076         drag->setPixmap(pixmap);
2077         drag->exec();
2078 }
2079
2080
2081 void DragTabBar::dragEnterEvent(QDragEnterEvent * event)
2082 {
2083         // Only accept if it's an tab-reordering request
2084         QMimeData const * m = event->mimeData();
2085         QStringList formats = m->formats();
2086         if (formats.contains("action")
2087             && m->data("action") == "tab-reordering")
2088                 event->acceptProposedAction();
2089 }
2090
2091
2092 void DragTabBar::dropEvent(QDropEvent * event)
2093 {
2094         int fromIndex = tabAt(dragStartPos_);
2095         int toIndex = tabAt(event->pos());
2096
2097         // Tell interested objects that
2098         if (fromIndex != toIndex)
2099                 tabMoveRequested(fromIndex, toIndex);
2100         event->acceptProposedAction();
2101 }
2102
2103
2104 } // namespace frontend
2105 } // namespace lyx
2106
2107 #include "moc_GuiWorkArea.cpp"