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_WS_MACX
  65 #include <QMacStyle>
  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 completer_(new GuiCompleter(p, p))
 250 {
 251 }
 252
 253
 254 GuiWorkArea::GuiWorkArea(QWidget * /* w */)
 255 : d(new Private(this))
 256 {
 257 }
 258
 259
 260 GuiWorkArea::GuiWorkArea(Buffer & buffer, GuiView & gv)
 261 : d(new Private(this))
 262 {
 263         setGuiView(gv);
 264         setBuffer(buffer);
 265         init();
 266 }
 267
 268
 269 void GuiWorkArea::init()
 270 {
 271         // Setup the signals
 272         connect(&d->cursor_timeout_, SIGNAL(timeout()),
 273                 this, SLOT(toggleCursor()));
 274
 275         int const time = QApplication::cursorFlashTime() / 2;
 276         if (time > 0) {
 277                 d->cursor_timeout_.setInterval(time);
 278                 d->cursor_timeout_.start();
 279         } else {
 280                 // let's initialize this just to be safe
 281                 d->cursor_timeout_.setInterval(500);
 282         }
 283
 284         d->resetScreen();
 285         // With Qt4.5 a mouse event will happen before the first paint event
 286         // so make sure that the buffer view has an up to date metrics.
 287         d->buffer_view_->resize(viewport()->width(), viewport()->height());
 288         d->cursor_ = new frontend::CursorWidget();
 289         d->cursor_->hide();
 290
 291         setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 292         setAcceptDrops(true);
 293         setMouseTracking(true);
 294         setMinimumSize(100, 70);
 295         setFrameStyle(QFrame::NoFrame);
 296         updateWindowTitle();
 297
 298         viewport()->setAutoFillBackground(false);
 299         // We don't need double-buffering nor SystemBackground on
 300         // the viewport because we have our own backing pixmap.
 301         viewport()->setAttribute(Qt::WA_NoSystemBackground);
 302
 303         setFocusPolicy(Qt::StrongFocus);
 304
 305         d->setCursorShape(Qt::IBeamCursor);
 306
 307         d->synthetic_mouse_event_.timeout.timeout.connect(
 308                 bind(&GuiWorkArea::generateSyntheticMouseEvent,
 309                                         this));
 310
 311         // Initialize the vertical Scroll Bar
 312         QObject::connect(verticalScrollBar(), SIGNAL(valueChanged(int)),
 313                 this, SLOT(scrollTo(int)));
 314
 315         LYXERR(Debug::GUI, "viewport width: " << viewport()->width()
 316                 << "  viewport height: " << viewport()->height());
 317
 318         // Enables input methods for asian languages.
 319         // Must be set when creating custom text editing widgets.
 320         setAttribute(Qt::WA_InputMethodEnabled, true);
 321
 322         d->dialog_mode_ = false;
 323 }
 324
 325
 326 GuiWorkArea::~GuiWorkArea()
 327 {
 328         d->buffer_view_->buffer().workAreaManager().remove(this);
 329         delete d->screen_;
 330         delete d->buffer_view_;
 331         delete d->cursor_;
 332         // Completer has a QObject parent and is thus automatically destroyed.
 333         // See #4758.
 334         // delete completer_;
 335         delete d;
 336 }
 337
 338
 339 Qt::CursorShape GuiWorkArea::cursorShape() const
 340 {
 341         return viewport()->cursor().shape();
 342 }
 343
 344
 345 void GuiWorkArea::Private::setCursorShape(Qt::CursorShape shape)
 346 {
 347         p->viewport()->setCursor(shape);
 348 }
 349
 350
 351 void GuiWorkArea::Private::updateCursorShape()
 352 {
 353         setCursorShape(buffer_view_->clickableInset()
 354                 ? Qt::PointingHandCursor : Qt::IBeamCursor);
 355 }
 356
 357
 358 void GuiWorkArea::setGuiView(GuiView & gv)
 359 {
 360         d->lyx_view_ = &gv;
 361 }
 362
 363
 364 void GuiWorkArea::setBuffer(Buffer & buffer)
 365 {
 366         delete d->buffer_view_;
 367         d->buffer_view_ = new BufferView(buffer);
 368         buffer.workAreaManager().add(this);
 369
 370         // HACK: Prevents an additional redraw when the scrollbar pops up
 371         // which regularily happens on documents with more than one page.
 372         // The policy  should be set to "Qt::ScrollBarAsNeeded" soon.
 373         // Since we have no geometry information yet, we assume that
 374         // a document needs a scrollbar if there is more then four
 375         // paragraph in the outermost text.
 376         if (buffer.text().paragraphs().size() > 4)
 377                 setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
 378         QTimer::singleShot(50, this, SLOT(fixVerticalScrollBar()));
 379 }
 380
 381
 382 void GuiWorkArea::fixVerticalScrollBar()
 383 {
 384         if (!isFullScreen())
 385                 setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
 386 }
 387
 388
 389 void GuiWorkArea::close()
 390 {
 391         d->lyx_view_->removeWorkArea(this);
 392 }
 393
 394
 395 void GuiWorkArea::setFullScreen(bool full_screen)
 396 {
 397         d->buffer_view_->setFullScreen(full_screen);
 398         setFrameStyle(QFrame::NoFrame);
 399         if (full_screen) {
 400                 setFrameStyle(QFrame::NoFrame);
 401                 if (lyxrc.full_screen_scrollbar)
 402                         setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 403         } else
 404                 setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
 405 }
 406
 407
 408 BufferView & GuiWorkArea::bufferView()
 409 {
 410         return *d->buffer_view_;
 411 }
 412
 413
 414 BufferView const & GuiWorkArea::bufferView() const
 415 {
 416         return *d->buffer_view_;
 417 }
 418
 419
 420 void GuiWorkArea::stopBlinkingCursor()
 421 {
 422         d->cursor_timeout_.stop();
 423         d->hideCursor();
 424 }
 425
 426
 427 void GuiWorkArea::startBlinkingCursor()
 428 {
 429         // do not show the cursor if the view is busy
 430         if (view().busy())
 431                 return;
 432
 433         Point p;
 434         int h = 0;
 435         d->buffer_view_->cursorPosAndHeight(p, h);
 436         // Don't start blinking if the cursor isn't on screen.
 437         if (!d->buffer_view_->cursorInView(p, h))
 438                 return;
 439
 440         d->showCursor();
 441
 442         //we're not supposed to cache this value.
 443         int const time = QApplication::cursorFlashTime() / 2;
 444         if (time <= 0)
 445                 return;
 446         d->cursor_timeout_.setInterval(time);
 447         d->cursor_timeout_.start();
 448 }
 449
 450
 451 void GuiWorkArea::redraw(bool update_metrics)
 452 {
 453         if (!isVisible())
 454                 // No need to redraw in this case.
 455                 return;
 456
 457         // No need to do anything if this is the current view. The BufferView
 458         // metrics are already up to date.
 459         if (update_metrics || d->lyx_view_ != guiApp->currentView()
 460                 || d->lyx_view_->currentWorkArea() != this) {
 461                 // FIXME: it would be nice to optimize for the off-screen case.
 462                 d->buffer_view_->cursor().fixIfBroken();
 463                 d->buffer_view_->updateMetrics();
 464                 d->buffer_view_->cursor().fixIfBroken();
 465         }
 466
 467         // update cursor position, because otherwise it has to wait until
 468         // the blinking interval is over
 469         if (d->cursor_visible_) {
 470                 d->hideCursor();
 471                 d->showCursor();
 472         }
 473
 474         LYXERR(Debug::WORKAREA, "WorkArea::redraw screen");
 475         d->updateScreen();
 476         update(0, 0, viewport()->width(), viewport()->height());
 477
 478         /// \warning: scrollbar updating *must* be done after the BufferView is drawn
 479         /// because \c BufferView::updateScrollbar() is called in \c BufferView::draw().
 480         d->updateScrollbar();
 481         d->lyx_view_->updateStatusBar();
 482
 483         if (lyxerr.debugging(Debug::WORKAREA))
 484                 d->buffer_view_->coordCache().dump();
 485
 486         updateWindowTitle();
 487
 488         d->updateCursorShape();
 489 }
 490
 491
 492 void GuiWorkArea::processKeySym(KeySymbol const & key, KeyModifier mod)
 493 {
 494         if (d->lyx_view_->isFullScreen() && d->lyx_view_->menuBar()->isVisible()
 495                 && lyxrc.full_screen_menubar) {
 496                 // FIXME HACK: we should not have to do this here. See related comment
 497                 // in GuiView::event() (QEvent::ShortcutOverride)
 498                 d->lyx_view_->menuBar()->hide();
 499         }
 500
 501         // In order to avoid bad surprise in the middle of an operation,
 502         // we better stop the blinking cursor...
 503         // the cursor gets restarted in GuiView::restartCursor()
 504         stopBlinkingCursor();
 505         guiApp->processKeySym(key, mod);
 506 }
 507
 508
 509 void GuiWorkArea::Private::dispatch(FuncRequest const & cmd0, KeyModifier mod)
 510 {
 511         // Handle drag&drop
 512         if (cmd0.action() == LFUN_FILE_OPEN) {
 513                 DispatchResult dr;
 514                 lyx_view_->dispatch(cmd0, dr);
 515                 return;
 516         }
 517
 518         FuncRequest cmd;
 519
 520         if (cmd0.action() == LFUN_MOUSE_PRESS) {
 521                 if (mod == ShiftModifier)
 522                         cmd = FuncRequest(cmd0, "region-select");
 523                 else if (mod == ControlModifier)
 524                         cmd = FuncRequest(cmd0, "paragraph-select");
 525                 else
 526                         cmd = cmd0;
 527         }
 528         else
 529                 cmd = cmd0;
 530
 531         bool const notJustMovingTheMouse =
 532                 cmd.action() != LFUN_MOUSE_MOTION || cmd.button() != mouse_button::none;
 533
 534         // In order to avoid bad surprise in the middle of an operation, we better stop
 535         // the blinking cursor.
 536         if (notJustMovingTheMouse)
 537                 p->stopBlinkingCursor();
 538
 539         buffer_view_->mouseEventDispatch(cmd);
 540
 541         // Skip these when selecting
 542         // FIXME: let GuiView take care of those.
 543         if (cmd.action() != LFUN_MOUSE_MOTION) {
 544                 completer_->updateVisibility(false, false);
 545                 lyx_view_->updateDialogs();
 546                 lyx_view_->updateStatusBar();
 547         }
 548
 549         // GUI tweaks except with mouse motion with no button pressed.
 550         if (notJustMovingTheMouse) {
 551                 // Slight hack: this is only called currently when we
 552                 // clicked somewhere, so we force through the display
 553                 // of the new status here.
 554                 // FIXME: let GuiView take care of those.
 555                 lyx_view_->clearMessage();
 556
 557                 // Show the cursor immediately after any operation
 558                 p->startBlinkingCursor();
 559         }
 560
 561         updateCursorShape();
 562 }
 563
 564
 565 void GuiWorkArea::Private::resizeBufferView()
 566 {
 567         // WARNING: Please don't put any code that will trigger a repaint here!
 568         // We are already inside a paint event.
 569         p->stopBlinkingCursor();
 570         // Warn our container (GuiView).
 571         p->busy(true);
 572
 573         Point point;
 574         int h = 0;
 575         buffer_view_->cursorPosAndHeight(point, h);
 576         bool const cursor_in_view = buffer_view_->cursorInView(point, h);
 577         buffer_view_->resize(p->viewport()->width(), p->viewport()->height());
 578         if (cursor_in_view)
 579                 buffer_view_->scrollToCursor();
 580         updateScreen();
 581
 582         // Update scrollbars which might have changed due different
 583         // BufferView dimension. This is especially important when the
 584         // BufferView goes from zero-size to the real-size for the first time,
 585         // as the scrollbar paramters are then set for the first time.
 586         updateScrollbar();
 587
 588         need_resize_ = false;
 589         p->busy(false);
 590         // Eventually, restart the cursor after the resize event.
 591         // We might be resizing even if the focus is on another widget so we only
 592         // restart the cursor if we have the focus.
 593         if (p->hasFocus())
 594                 QTimer::singleShot(50, p, SLOT(startBlinkingCursor()));
 595 }
 596
 597
 598 void GuiWorkArea::Private::showCursor()
 599 {
 600         if (cursor_visible_)
 601                 return;
 602
 603         Point p;
 604         int h = 0;
 605         buffer_view_->cursorPosAndHeight(p, h);
 606         if (!buffer_view_->cursorInView(p, h))
 607                 return;
 608
 609         // RTL or not RTL
 610         bool l_shape = false;
 611         Font const & realfont = buffer_view_->cursor().real_current_font;
 612         BufferParams const & bp = buffer_view_->buffer().params();
 613         bool const samelang = realfont.language() == bp.language;
 614         bool const isrtl = realfont.isVisibleRightToLeft();
 615
 616         if (!samelang || isrtl != bp.language->rightToLeft())
 617                 l_shape = true;
 618
 619         // The ERT language hack needs fixing up
 620         if (realfont.language() == latex_language)
 621                 l_shape = false;
 622
 623         // show cursor on screen
 624         Cursor & cur = buffer_view_->cursor();
 625         bool completable = cur.inset().showCompletionCursor()
 626                 && completer_->completionAvailable()
 627                 && !completer_->popupVisible()
 628                 && !completer_->inlineVisible();
 629         cursor_visible_ = true;
 630         cursor_->recomputeWidth();
 631         showCursor(p.x_, p.y_, h, l_shape, isrtl, completable);
 632 }
 633
 634
 635 void GuiWorkArea::Private::hideCursor()
 636 {
 637         if (!cursor_visible_)
 638                 return;
 639
 640         cursor_visible_ = false;
 641         removeCursor();
 642 }
 643
 644
 645 void GuiWorkArea::toggleCursor()
 646 {
 647         if (d->cursor_visible_)
 648                 d->hideCursor();
 649         else
 650                 d->showCursor();
 651 }
 652
 653
 654 void GuiWorkArea::Private::updateScrollbar()
 655 {
 656         ScrollbarParameters const & scroll_ = buffer_view_->scrollbarParameters();
 657         // WARNING: don't touch at the scrollbar value like this:
 658         //   verticalScrollBar()->setValue(scroll_.position);
 659         // because this would cause a recursive signal/slot calling with
 660         // GuiWorkArea::scrollTo
 661         p->verticalScrollBar()->setRange(scroll_.min, scroll_.max);
 662         p->verticalScrollBar()->setPageStep(scroll_.page_step);
 663         p->verticalScrollBar()->setSingleStep(scroll_.single_step);
 664         p->verticalScrollBar()->setSliderPosition(scroll_.position);
 665 }
 666
 667
 668 void GuiWorkArea::scrollTo(int value)
 669 {
 670         stopBlinkingCursor();
 671         d->buffer_view_->scrollDocView(value, true);
 672
 673         if (lyxrc.cursor_follows_scrollbar) {
 674                 d->buffer_view_->setCursorFromScrollbar();
 675                 // FIXME: let GuiView take care of those.
 676                 d->lyx_view_->updateLayoutList();
 677         }
 678         // Show the cursor immediately after any operation.
 679         startBlinkingCursor();
 680 #ifdef Q_WS_X11
 681         QApplication::syncX();
 682 #endif
 683 }
 684
 685
 686 bool GuiWorkArea::event(QEvent * e)
 687 {
 688         switch (e->type()) {
 689         case QEvent::ToolTip: {
 690                 QHelpEvent * helpEvent = static_cast<QHelpEvent *>(e);
 691                 if (lyxrc.use_tooltip) {
 692                         QPoint pos = helpEvent->pos();
 693                         if (pos.x() < viewport()->width()) {
 694                                 QString s = toqstr(d->buffer_view_->toolTip(pos.x(), pos.y()));
 695                                 QToolTip::showText(helpEvent->globalPos(), s);
 696                         }
 697                         else
 698                                 QToolTip::hideText();
 699                 }
 700                 // Don't forget to accept the event!
 701                 e->accept();
 702                 return true;
 703         }
 704
 705         case QEvent::ShortcutOverride: {
 706                 // We catch this event in order to catch the Tab or Shift+Tab key press
 707                 // which are otherwise reserved to focus switching between controls
 708                 // within a dialog.
 709                 QKeyEvent * ke = static_cast<QKeyEvent*>(e);
 710                 if ((ke->key() == Qt::Key_Tab && ke->modifiers() == Qt::NoModifier)
 711                         || (ke->key() == Qt::Key_Backtab && (
 712                                 ke->modifiers() == Qt::ShiftModifier
 713                                 || ke->modifiers() == Qt::NoModifier))) {
 714                         keyPressEvent(ke);
 715                         return true;
 716                 }
 717                 return QAbstractScrollArea::event(e);
 718         }
 719
 720         default:
 721                 return QAbstractScrollArea::event(e);
 722         }
 723         return false;
 724 }
 725
 726
 727 void GuiWorkArea::contextMenuEvent(QContextMenuEvent * e)
 728 {
 729         string name;
 730         if (e->reason() == QContextMenuEvent::Mouse)
 731                 // the menu name is set on mouse press
 732                 name = d->context_menu_name_;
 733         else {
 734                 QPoint pos = e->pos();
 735                 Cursor const & cur = d->buffer_view_->cursor();
 736                 if (e->reason() == QContextMenuEvent::Keyboard && cur.inTexted()) {
 737                         // Do not access the context menu of math right in front of before
 738                         // the cursor. This does not work when the cursor is in text.
 739                         Inset * inset = cur.paragraph().getInset(cur.pos());
 740                         if (inset && inset->asInsetMath())
 741                                 --pos.rx();
 742                         else if (cur.pos() > 0) {
 743                                 Inset * inset = cur.paragraph().getInset(cur.pos() - 1);
 744                                 if (inset)
 745                                         ++pos.rx();
 746                         }
 747                 }
 748                 name = d->buffer_view_->contextMenu(pos.x(), pos.y());
 749         }
 750
 751         if (name.empty()) {
 752                 QAbstractScrollArea::contextMenuEvent(e);
 753                 return;
 754         }
 755         // always show mnemonics when the keyboard is used to show the context menu
 756         // FIXME: This should be fixed in Qt itself
 757         bool const keyboard = (e->reason() == QContextMenuEvent::Keyboard);
 758         QMenu * menu = guiApp->menus().menu(toqstr(name), *d->lyx_view_, keyboard);
 759         if (!menu) {
 760                 QAbstractScrollArea::contextMenuEvent(e);
 761                 return;
 762         }
 763         // Position the menu to the right.
 764         // FIXME: menu position should be different for RTL text.
 765         menu->exec(e->globalPos());
 766         e->accept();
 767 }
 768
 769
 770 void GuiWorkArea::focusInEvent(QFocusEvent * e)
 771 {
 772         LYXERR(Debug::DEBUG, "GuiWorkArea::focusInEvent(): " << this << endl);
 773         if (d->lyx_view_->currentWorkArea() != this) {
 774                 d->lyx_view_->setCurrentWorkArea(this);
 775                 d->lyx_view_->currentWorkArea()->bufferView().buffer().updateBuffer();
 776         }
 777
 778         startBlinkingCursor();
 779         QAbstractScrollArea::focusInEvent(e);
 780 }
 781
 782
 783 void GuiWorkArea::focusOutEvent(QFocusEvent * e)
 784 {
 785         LYXERR(Debug::DEBUG, "GuiWorkArea::focusOutEvent(): " << this << endl);
 786         stopBlinkingCursor();
 787         QAbstractScrollArea::focusOutEvent(e);
 788 }
 789
 790
 791 void GuiWorkArea::mousePressEvent(QMouseEvent * e)
 792 {
 793         if (d->dc_event_.active && d->dc_event_ == *e) {
 794                 d->dc_event_.active = false;
 795                 FuncRequest cmd(LFUN_MOUSE_TRIPLE, e->x(), e->y(),
 796                         q_button_state(e->button()));
 797                 d->dispatch(cmd);
 798                 e->accept();
 799                 return;
 800         }
 801
 802 #if (QT_VERSION < 0x050000)
 803         inputContext()->reset();
 804 #endif
 805
 806         FuncRequest const cmd(LFUN_MOUSE_PRESS, e->x(), e->y(),
 807                 q_button_state(e->button()));
 808         d->dispatch(cmd, q_key_state(e->modifiers()));
 809
 810         // Save the context menu on mouse press, because also the mouse
 811         // cursor is set on mouse press. Afterwards, we can either release
 812         // the mousebutton somewhere else, or the cursor might have moved
 813         // due to the DEPM. We need to do this after the mouse has been
 814         // set in dispatch(), because the selection state might change.
 815         if (e->button() == Qt::RightButton)
 816                 d->context_menu_name_ = d->buffer_view_->contextMenu(e->x(), e->y());
 817
 818         e->accept();
 819 }
 820
 821
 822 void GuiWorkArea::mouseReleaseEvent(QMouseEvent * e)
 823 {
 824         if (d->synthetic_mouse_event_.timeout.running())
 825                 d->synthetic_mouse_event_.timeout.stop();
 826
 827         FuncRequest const cmd(LFUN_MOUSE_RELEASE, e->x(), e->y(),
 828                               q_button_state(e->button()));
 829         d->dispatch(cmd);
 830         e->accept();
 831 }
 832
 833
 834 void GuiWorkArea::mouseMoveEvent(QMouseEvent * e)
 835 {
 836         // we kill the triple click if we move
 837         doubleClickTimeout();
 838         FuncRequest cmd(LFUN_MOUSE_MOTION, e->x(), e->y(),
 839                 q_motion_state(e->buttons()));
 840
 841         e->accept();
 842
 843         // If we're above or below the work area...
 844         if ((e->y() <= 20 || e->y() >= viewport()->height() - 20)
 845                         && e->buttons() == mouse_button::button1) {
 846                 // Make sure only a synthetic event can cause a page scroll,
 847                 // so they come at a steady rate:
 848                 if (e->y() <= 20)
 849                         // _Force_ a scroll up:
 850                         cmd.set_y(e->y() - 21);
 851                 else
 852                         cmd.set_y(e->y() + 21);
 853                 // Store the event, to be handled when the timeout expires.
 854                 d->synthetic_mouse_event_.cmd = cmd;
 855
 856                 if (d->synthetic_mouse_event_.timeout.running()) {
 857                         // Discard the event. Note that it _may_ be handled
 858                         // when the timeout expires if
 859                         // synthetic_mouse_event_.cmd has not been overwritten.
 860                         // Ie, when the timeout expires, we handle the
 861                         // most recent event but discard all others that
 862                         // occurred after the one used to start the timeout
 863                         // in the first place.
 864                         return;
 865                 }
 866
 867                 d->synthetic_mouse_event_.restart_timeout = true;
 868                 d->synthetic_mouse_event_.timeout.start();
 869                 // Fall through to handle this event...
 870
 871         } else if (d->synthetic_mouse_event_.timeout.running()) {
 872                 // Store the event, to be possibly handled when the timeout
 873                 // expires.
 874                 // Once the timeout has expired, normal control is returned
 875                 // to mouseMoveEvent (restart_timeout = false).
 876                 // This results in a much smoother 'feel' when moving the
 877                 // mouse back into the work area.
 878                 d->synthetic_mouse_event_.cmd = cmd;
 879                 d->synthetic_mouse_event_.restart_timeout = false;
 880                 return;
 881         }
 882         d->dispatch(cmd);
 883 }
 884
 885
 886 void GuiWorkArea::wheelEvent(QWheelEvent * ev)
 887 {
 888         // Wheel rotation by one notch results in a delta() of 120 (see
 889         // documentation of QWheelEvent)
 890         double const delta = ev->delta() / 120.0;
 891         bool zoom = false;
 892         switch (lyxrc.scroll_wheel_zoom) {
 893         case LyXRC::SCROLL_WHEEL_ZOOM_CTRL:
 894                 zoom = ev->modifiers() & Qt::ControlModifier;
 895                 zoom &= !(ev->modifiers() & (Qt::ShiftModifier | Qt::AltModifier));
 896                 break;
 897         case LyXRC::SCROLL_WHEEL_ZOOM_SHIFT:
 898                 zoom = ev->modifiers() & Qt::ShiftModifier;
 899                 zoom &= !(ev->modifiers() & (Qt::ControlModifier | Qt::AltModifier));
 900                 break;
 901         case LyXRC::SCROLL_WHEEL_ZOOM_ALT:
 902                 zoom = ev->modifiers() & Qt::AltModifier;
 903                 zoom &= !(ev->modifiers() & (Qt::ShiftModifier | Qt::ControlModifier));
 904                 break;
 905         case LyXRC::SCROLL_WHEEL_ZOOM_OFF:
 906                 break;
 907         }
 908         if (zoom) {
 909                 docstring arg = convert<docstring>(int(5 * delta));
 910                 lyx::dispatch(FuncRequest(LFUN_BUFFER_ZOOM_IN, arg));
 911                 return;
 912         }
 913
 914         // Take into account the desktop wide settings.
 915         int const lines = qApp->wheelScrollLines();
 916         int const page_step = verticalScrollBar()->pageStep();
 917         // Test if the wheel mouse is set to one screen at a time.
 918         int scroll_value = lines > page_step
 919                 ? page_step : lines * verticalScrollBar()->singleStep();
 920
 921         // Take into account the rotation and the user preferences.
 922         scroll_value = int(scroll_value * delta * lyxrc.mouse_wheel_speed);
 923         LYXERR(Debug::SCROLLING, "wheelScrollLines = " << lines
 924                         << " delta = " << delta << " scroll_value = " << scroll_value
 925                         << " page_step = " << page_step);
 926         // Now scroll.
 927         verticalScrollBar()->setValue(verticalScrollBar()->value() - scroll_value);
 928
 929         ev->accept();
 930 }
 931
 932
 933 void GuiWorkArea::generateSyntheticMouseEvent()
 934 {
 935         int const e_y = d->synthetic_mouse_event_.cmd.y();
 936         int const wh = d->buffer_view_->workHeight();
 937         bool const up = e_y < 0;
 938         bool const down = e_y > wh;
 939
 940         // Set things off to generate the _next_ 'pseudo' event.
 941         int step = 50;
 942         if (d->synthetic_mouse_event_.restart_timeout) {
 943                 // This is some magic formulae to determine the speed
 944                 // of scrolling related to the position of the mouse.
 945                 int time = 200;
 946                 if (up || down) {
 947                         int dist = up ? -e_y : e_y - wh;
 948                         time = max(min(200, 250000 / (dist * dist)), 1) ;
 949
 950                         if (time < 40) {
 951                                 step = 80000 / (time * time);
 952                                 time = 40;
 953                         }
 954                 }
 955                 d->synthetic_mouse_event_.timeout.setTimeout(time);
 956                 d->synthetic_mouse_event_.timeout.start();
 957         }
 958
 959         // Can we scroll further ?
 960         int const value = verticalScrollBar()->value();
 961         if (value == verticalScrollBar()->maximum()
 962                   || value == verticalScrollBar()->minimum()) {
 963                 d->synthetic_mouse_event_.timeout.stop();
 964                 return;
 965         }
 966
 967         // Scroll
 968         if (step <= 2 * wh) {
 969                 d->buffer_view_->scroll(up ? -step : step);
 970                 d->buffer_view_->updateMetrics();
 971         } else {
 972                 d->buffer_view_->scrollDocView(value + (up ? -step : step), false);
 973         }
 974
 975         // In which paragraph do we have to set the cursor ?
 976         Cursor & cur = d->buffer_view_->cursor();
 977         // FIXME: we don't know howto handle math.
 978         Text * text = cur.text();
 979         if (!text)
 980                 return;
 981         TextMetrics const & tm = d->buffer_view_->textMetrics(text);
 982
 983         pair<pit_type, const ParagraphMetrics *> pp = up ? tm.first() : tm.last();
 984         ParagraphMetrics const & pm = *pp.second;
 985         pit_type const pit = pp.first;
 986
 987         if (pm.rows().empty())
 988                 return;
 989
 990         // Find the row at which we set the cursor.
 991         RowList::const_iterator rit = pm.rows().begin();
 992         RowList::const_iterator rlast = pm.rows().end();
 993         int yy = pm.position() - pm.ascent();
 994         for (--rlast; rit != rlast; ++rit) {
 995                 int h = rit->height();
 996                 if ((up && yy + h > 0)
 997                           || (!up && yy + h > wh - defaultRowHeight()))
 998                         break;
 999                 yy += h;
1000         }
1001
1002         // Find the position of the cursor
1003         bool bound;
1004         int x = d->synthetic_mouse_event_.cmd.x();
1005         pos_type const pos = rit->pos() + tm.getColumnNearX(pit, *rit, x, bound);
1006
1007         // Set the cursor
1008         cur.pit() = pit;
1009         cur.pos() = pos;
1010         cur.boundary(bound);
1011
1012         d->buffer_view_->buffer().changed(false);
1013         return;
1014 }
1015
1016
1017 void GuiWorkArea::keyPressEvent(QKeyEvent * ev)
1018 {
1019         // Do not process here some keys if dialog_mode_ is set
1020         if (d->dialog_mode_
1021                 && (ev->modifiers() == Qt::NoModifier
1022                     || ev->modifiers() == Qt::ShiftModifier)
1023                 && (ev->key() == Qt::Key_Escape
1024                     || ev->key() == Qt::Key_Enter
1025                     || ev->key() == Qt::Key_Return)
1026             ) {
1027                 ev->ignore();
1028                 return;
1029         }
1030
1031         // intercept some keys if completion popup is visible
1032         if (d->completer_->popupVisible()) {
1033                 switch (ev->key()) {
1034                 case Qt::Key_Enter:
1035                 case Qt::Key_Return:
1036                         d->completer_->activate();
1037                         ev->accept();
1038                         return;
1039                 }
1040         }
1041
1042         // do nothing if there are other events
1043         // (the auto repeated events come too fast)
1044         // it looks like this is only needed on X11
1045 #ifdef Q_WS_X11
1046         if (qApp->hasPendingEvents() && ev->isAutoRepeat()) {
1047                 switch (ev->key()) {
1048                 case Qt::Key_PageDown:
1049                 case Qt::Key_PageUp:
1050                 case Qt::Key_Left:
1051                 case Qt::Key_Right:
1052                 case Qt::Key_Up:
1053                 case Qt::Key_Down:
1054                         LYXERR(Debug::KEY, "system is busy: scroll key event ignored");
1055                         ev->ignore();
1056                         return;
1057                 }
1058         }
1059 #endif
1060
1061         KeyModifier m = q_key_state(ev->modifiers());
1062
1063         std::string str;
1064         if (m & ShiftModifier)
1065                 str += "Shift-";
1066         if (m & ControlModifier)
1067                 str += "Control-";
1068         if (m & AltModifier)
1069                 str += "Alt-";
1070         if (m & MetaModifier)
1071                 str += "Meta-";
1072
1073         LYXERR(Debug::KEY, " count: " << ev->count() << " text: " << ev->text()
1074                 << " isAutoRepeat: " << ev->isAutoRepeat() << " key: " << ev->key()
1075                 << " keyState: " << str);
1076
1077         KeySymbol sym;
1078         setKeySymbol(&sym, ev);
1079         if (sym.isOK()) {
1080                 processKeySym(sym, q_key_state(ev->modifiers()));
1081                 ev->accept();
1082         } else {
1083                 ev->ignore();
1084         }
1085 }
1086
1087
1088 void GuiWorkArea::doubleClickTimeout()
1089 {
1090         d->dc_event_.active = false;
1091 }
1092
1093
1094 void GuiWorkArea::mouseDoubleClickEvent(QMouseEvent * ev)
1095 {
1096         d->dc_event_ = DoubleClick(ev);
1097         QTimer::singleShot(QApplication::doubleClickInterval(), this,
1098                            SLOT(doubleClickTimeout()));
1099         FuncRequest cmd(LFUN_MOUSE_DOUBLE,
1100                         ev->x(), ev->y(),
1101                         q_button_state(ev->button()));
1102         d->dispatch(cmd);
1103         ev->accept();
1104 }
1105
1106
1107 void GuiWorkArea::resizeEvent(QResizeEvent * ev)
1108 {
1109         QAbstractScrollArea::resizeEvent(ev);
1110         d->need_resize_ = true;
1111         ev->accept();
1112 }
1113
1114
1115 void GuiWorkArea::Private::update(int x, int y, int w, int h)
1116 {
1117         p->viewport()->update(x, y, w, h);
1118 }
1119
1120
1121 void GuiWorkArea::paintEvent(QPaintEvent * ev)
1122 {
1123         QRect const rc = ev->rect();
1124         // LYXERR(Debug::PAINTING, "paintEvent begin: x: " << rc.x()
1125         //      << " y: " << rc.y() << " w: " << rc.width() << " h: " << rc.height());
1126
1127         if (d->need_resize_) {
1128                 d->resetScreen();
1129                 d->resizeBufferView();
1130                 if (d->cursor_visible_) {
1131                         d->hideCursor();
1132                         d->showCursor();
1133                 }
1134         }
1135
1136         QPainter pain(viewport());
1137         if (lyxrc.use_qimage) {
1138                 pain.drawImage(rc, static_cast<QImage const &>(*d->screen_), rc);
1139         } else {
1140                 pain.drawPixmap(rc, static_cast<QPixmap const &>(*d->screen_), rc);
1141         }
1142         d->cursor_->draw(pain);
1143         ev->accept();
1144 }
1145
1146
1147 void GuiWorkArea::Private::updateScreen()
1148 {
1149         GuiPainter pain(screen_);
1150         buffer_view_->draw(pain);
1151 }
1152
1153
1154 void GuiWorkArea::Private::showCursor(int x, int y, int h,
1155         bool l_shape, bool rtl, bool completable)
1156 {
1157         if (schedule_redraw_) {
1158                 // This happens when a graphic conversion is finished. As we don't know
1159                 // the size of the new graphics, it's better the update everything.
1160                 // We can't use redraw() here because this would trigger a infinite
1161                 // recursive loop with showCursor().
1162                 buffer_view_->resize(p->viewport()->width(), p->viewport()->height());
1163                 updateScreen();
1164                 updateScrollbar();
1165                 p->viewport()->update(QRect(0, 0, p->viewport()->width(), p->viewport()->height()));
1166                 schedule_redraw_ = false;
1167                 // Show the cursor immediately after the update.
1168                 hideCursor();
1169                 p->toggleCursor();
1170                 return;
1171         }
1172
1173         cursor_->update(x, y, h, l_shape, rtl, completable);
1174         cursor_->show();
1175         p->viewport()->update(cursor_->rect());
1176 }
1177
1178
1179 void GuiWorkArea::Private::removeCursor()
1180 {
1181         cursor_->hide();
1182         //if (!qApp->focusWidget())
1183                 p->viewport()->update(cursor_->rect());
1184 }
1185
1186
1187 void GuiWorkArea::inputMethodEvent(QInputMethodEvent * e)
1188 {
1189         QString const & commit_string = e->commitString();
1190         docstring const & preedit_string
1191                 = qstring_to_ucs4(e->preeditString());
1192
1193         if (!commit_string.isEmpty()) {
1194
1195                 LYXERR(Debug::KEY, "preeditString: " << e->preeditString()
1196                         << " commitString: " << e->commitString());
1197
1198                 int key = 0;
1199
1200                 // FIXME Iwami 04/01/07: we should take care also of UTF16 surrogates here.
1201                 for (int i = 0; i != commit_string.size(); ++i) {
1202                         QKeyEvent ev(QEvent::KeyPress, key, Qt::NoModifier, commit_string[i]);
1203                         keyPressEvent(&ev);
1204                 }
1205         }
1206
1207         // Hide the cursor during the kana-kanji transformation.
1208         if (preedit_string.empty())
1209                 startBlinkingCursor();
1210         else
1211                 stopBlinkingCursor();
1212
1213         // last_width : for checking if last preedit string was/wasn't empty.
1214         // FIXME THREAD
1215         // We could have more than one work area, right?
1216         static bool last_width = false;
1217         if (!last_width && preedit_string.empty()) {
1218                 // if last_width is last length of preedit string.
1219                 e->accept();
1220                 return;
1221         }
1222
1223         GuiPainter pain(d->screen_);
1224         d->buffer_view_->updateMetrics();
1225         d->buffer_view_->draw(pain);
1226         FontInfo font = d->buffer_view_->cursor().getFont().fontInfo();
1227         FontMetrics const & fm = theFontMetrics(font);
1228         int height = fm.maxHeight();
1229         int cur_x = d->cursor_->rect().left();
1230         int cur_y = d->cursor_->rect().bottom();
1231
1232         // redraw area of preedit string.
1233         update(0, cur_y - height, viewport()->width(),
1234                 (height + 1) * d->preedit_lines_);
1235
1236         if (preedit_string.empty()) {
1237                 last_width = false;
1238                 d->preedit_lines_ = 1;
1239                 e->accept();
1240                 return;
1241         }
1242         last_width = true;
1243
1244         // att : stores an IM attribute.
1245         QList<QInputMethodEvent::Attribute> const & att = e->attributes();
1246
1247         // get attributes of input method cursor.
1248         // cursor_pos : cursor position in preedit string.
1249         size_t cursor_pos = 0;
1250         bool cursor_is_visible = false;
1251         for (int i = 0; i != att.size(); ++i) {
1252                 if (att.at(i).type == QInputMethodEvent::Cursor) {
1253                         cursor_pos = att.at(i).start;
1254                         cursor_is_visible = att.at(i).length != 0;
1255                         break;
1256                 }
1257         }
1258
1259         size_t preedit_length = preedit_string.length();
1260
1261         // get position of selection in input method.
1262         // FIXME: isn't there a way to do this simplier?
1263         // rStart : cursor position in selected string in IM.
1264         size_t rStart = 0;
1265         // rLength : selected string length in IM.
1266         size_t rLength = 0;
1267         if (cursor_pos < preedit_length) {
1268                 for (int i = 0; i != att.size(); ++i) {
1269                         if (att.at(i).type == QInputMethodEvent::TextFormat) {
1270                                 if (att.at(i).start <= int(cursor_pos)
1271                                         && int(cursor_pos) < att.at(i).start + att.at(i).length) {
1272                                                 rStart = att.at(i).start;
1273                                                 rLength = att.at(i).length;
1274                                                 if (!cursor_is_visible)
1275                                                         cursor_pos += rLength;
1276                                                 break;
1277                                 }
1278                         }
1279                 }
1280         }
1281         else {
1282                 rStart = cursor_pos;
1283                 rLength = 0;
1284         }
1285
1286         int const right_margin = d->buffer_view_->rightMargin();
1287         Painter::preedit_style ps;
1288         // Most often there would be only one line:
1289         d->preedit_lines_ = 1;
1290         for (size_t pos = 0; pos != preedit_length; ++pos) {
1291                 char_type const typed_char = preedit_string[pos];
1292                 // reset preedit string style
1293                 ps = Painter::preedit_default;
1294
1295                 // if we reached the right extremity of the screen, go to next line.
1296                 if (cur_x + fm.width(typed_char) > viewport()->width() - right_margin) {
1297                         cur_x = right_margin;
1298                         cur_y += height + 1;
1299                         ++d->preedit_lines_;
1300                 }
1301                 // preedit strings are displayed with dashed underline
1302                 // and partial strings are displayed white on black indicating
1303                 // that we are in selecting mode in the input method.
1304                 // FIXME: rLength == preedit_length is not a changing condition
1305                 // FIXME: should be put out of the loop.
1306                 if (pos >= rStart
1307                         && pos < rStart + rLength
1308                         && !(cursor_pos < rLength && rLength == preedit_length))
1309                         ps = Painter::preedit_selecting;
1310
1311                 if (pos == cursor_pos
1312                         && (cursor_pos < rLength && rLength == preedit_length))
1313                         ps = Painter::preedit_cursor;
1314
1315                 // draw one character and update cur_x.
1316                 cur_x += pain.preeditText(cur_x, cur_y, typed_char, font, ps);
1317         }
1318
1319         // update the preedit string screen area.
1320         update(0, cur_y - d->preedit_lines_*height, viewport()->width(),
1321                 (height + 1) * d->preedit_lines_);
1322
1323         // Don't forget to accept the event!
1324         e->accept();
1325 }
1326
1327
1328 QVariant GuiWorkArea::inputMethodQuery(Qt::InputMethodQuery query) const
1329 {
1330         QRect cur_r(0, 0, 0, 0);
1331         switch (query) {
1332                 // this is the CJK-specific composition window position and
1333                 // the context menu position when the menu key is pressed.
1334                 case Qt::ImMicroFocus:
1335                         cur_r = d->cursor_->rect();
1336                         if (d->preedit_lines_ != 1)
1337                                 cur_r.moveLeft(10);
1338                         cur_r.moveBottom(cur_r.bottom()
1339                                 + cur_r.height() * (d->preedit_lines_ - 1));
1340                         // return lower right of cursor in LyX.
1341                         return cur_r;
1342                 default:
1343                         return QWidget::inputMethodQuery(query);
1344         }
1345 }
1346
1347
1348 void GuiWorkArea::updateWindowTitle()
1349 {
1350         docstring maximize_title;
1351         docstring minimize_title;
1352
1353         Buffer const & buf = d->buffer_view_->buffer();
1354         FileName const file_name = buf.fileName();
1355         if (!file_name.empty()) {
1356                 maximize_title = file_name.displayName(130);
1357                 minimize_title = from_utf8(file_name.onlyFileName());
1358                 if (buf.lyxvc().inUse()) {
1359                         if (buf.lyxvc().locking())
1360                                 maximize_title +=  _(" (version control, locking)");
1361                         else
1362                                 maximize_title +=  _(" (version control)");
1363                 }
1364                 if (!buf.isClean()) {
1365                         maximize_title += _(" (changed)");
1366                         minimize_title += char_type('*');
1367                 }
1368                 if (buf.isReadonly())
1369                         maximize_title += _(" (read only)");
1370         }
1371
1372         QString const new_title = toqstr(maximize_title);
1373         if (new_title != windowTitle()) {
1374                 QWidget::setWindowTitle(new_title);
1375                 QWidget::setWindowIconText(toqstr(minimize_title));
1376                 titleChanged(this);
1377         }
1378 }
1379
1380
1381 bool GuiWorkArea::isFullScreen() const
1382 {
1383         return d->lyx_view_ && d->lyx_view_->isFullScreen();
1384 }
1385
1386
1387 void GuiWorkArea::scheduleRedraw()
1388 {
1389         d->schedule_redraw_ = true;
1390 }
1391
1392
1393 bool GuiWorkArea::inDialogMode() const
1394 {
1395         return d->dialog_mode_;
1396 }
1397
1398
1399 void GuiWorkArea::setDialogMode(bool mode)
1400 {
1401         d->dialog_mode_ = mode;
1402 }
1403
1404
1405 GuiCompleter & GuiWorkArea::completer()
1406 {
1407         return *d->completer_;
1408 }
1409
1410 GuiView const & GuiWorkArea::view() const
1411 {
1412         return *d->lyx_view_;
1413 }
1414
1415
1416 GuiView & GuiWorkArea::view()
1417 {
1418         return *d->lyx_view_;
1419 }
1420
1421 ////////////////////////////////////////////////////////////////////
1422 //
1423 // EmbeddedWorkArea
1424 //
1425 ////////////////////////////////////////////////////////////////////
1426
1427
1428 EmbeddedWorkArea::EmbeddedWorkArea(QWidget * w): GuiWorkArea(w)
1429 {
1430         support::TempFile tempfile("embedded.internal");
1431         tempfile.setAutoRemove(false);
1432         buffer_ = theBufferList().newInternalBuffer(tempfile.name().absFileName());
1433         buffer_->setUnnamed(true);
1434         buffer_->setFullyLoaded(true);
1435         setBuffer(*buffer_);
1436         setDialogMode(true);
1437 }
1438
1439
1440 EmbeddedWorkArea::~EmbeddedWorkArea()
1441 {
1442         // No need to destroy buffer and bufferview here, because it is done
1443         // in theBufferList() destruction loop at application exit
1444 }
1445
1446
1447 void EmbeddedWorkArea::closeEvent(QCloseEvent * ev)
1448 {
1449         disable();
1450         GuiWorkArea::closeEvent(ev);
1451 }
1452
1453
1454 void EmbeddedWorkArea::hideEvent(QHideEvent * ev)
1455 {
1456         disable();
1457         GuiWorkArea::hideEvent(ev);
1458 }
1459
1460
1461 QSize EmbeddedWorkArea::sizeHint () const
1462 {
1463         // FIXME(?):
1464         // GuiWorkArea sets the size to the screen's viewport
1465         // by returning a value this gets overridden
1466         // EmbeddedWorkArea is now sized to fit in the layout
1467         // of the parent, and has a minimum size set in GuiWorkArea
1468         // which is what we return here
1469         return QSize(100, 70);
1470 }
1471
1472
1473 void EmbeddedWorkArea::disable()
1474 {
1475         stopBlinkingCursor();
1476         if (view().currentWorkArea() != this)
1477                 return;
1478         // No problem if currentMainWorkArea() is 0 (setCurrentWorkArea()
1479         // tolerates it and shows the background logo), what happens if
1480         // an EmbeddedWorkArea is closed after closing all document WAs
1481         view().setCurrentWorkArea(view().currentMainWorkArea());
1482 }
1483
1484 ////////////////////////////////////////////////////////////////////
1485 //
1486 // TabWorkArea
1487 //
1488 ////////////////////////////////////////////////////////////////////
1489
1490 #ifdef Q_WS_MACX
1491 class NoTabFrameMacStyle : public QMacStyle {
1492 public:
1493         ///
1494         QRect subElementRect(SubElement element, const QStyleOption * option,
1495                              const QWidget * widget = 0) const
1496         {
1497                 QRect rect = QMacStyle::subElementRect(element, option, widget);
1498                 bool noBar = static_cast<QTabWidget const *>(widget)->count() <= 1;
1499
1500                 // The Qt Mac style puts the contents into a 3 pixel wide box
1501                 // which looks very ugly and not like other Mac applications.
1502                 // Hence we remove this here, and moreover the 16 pixel round
1503                 // frame above if the tab bar is hidden.
1504                 if (element == QStyle::SE_TabWidgetTabContents) {
1505                         rect.adjust(- rect.left(), 0, rect.left(), 0);
1506                         if (noBar)
1507                                 rect.setTop(0);
1508                 }
1509
1510                 return rect;
1511         }
1512 };
1513
1514 NoTabFrameMacStyle noTabFrameMacStyle;
1515 #endif
1516
1517
1518 TabWorkArea::TabWorkArea(QWidget * parent)
1519         : QTabWidget(parent), clicked_tab_(-1)
1520 {
1521 #ifdef Q_WS_MACX
1522         setStyle(&noTabFrameMacStyle);
1523 #endif
1524
1525         QPalette pal = palette();
1526         pal.setColor(QPalette::Active, QPalette::Button,
1527                 pal.color(QPalette::Active, QPalette::Window));
1528         pal.setColor(QPalette::Disabled, QPalette::Button,
1529                 pal.color(QPalette::Disabled, QPalette::Window));
1530         pal.setColor(QPalette::Inactive, QPalette::Button,
1531                 pal.color(QPalette::Inactive, QPalette::Window));
1532
1533         QObject::connect(this, SIGNAL(currentChanged(int)),
1534                 this, SLOT(on_currentTabChanged(int)));
1535
1536         closeBufferButton = new QToolButton(this);
1537         closeBufferButton->setPalette(pal);
1538         // FIXME: rename the icon to closebuffer.png
1539         closeBufferButton->setIcon(QIcon(getPixmap("images/", "closetab", "png")));
1540         closeBufferButton->setText("Close File");
1541         closeBufferButton->setAutoRaise(true);
1542         closeBufferButton->setCursor(Qt::ArrowCursor);
1543         closeBufferButton->setToolTip(qt_("Close File"));
1544         closeBufferButton->setEnabled(true);
1545         QObject::connect(closeBufferButton, SIGNAL(clicked()),
1546                 this, SLOT(closeCurrentBuffer()));
1547         setCornerWidget(closeBufferButton, Qt::TopRightCorner);
1548
1549         // setup drag'n'drop
1550         QTabBar* tb = new DragTabBar;
1551         connect(tb, SIGNAL(tabMoveRequested(int, int)),
1552                 this, SLOT(moveTab(int, int)));
1553         tb->setElideMode(Qt::ElideNone);
1554         setTabBar(tb);
1555
1556         // make us responsible for the context menu of the tabbar
1557         tb->setContextMenuPolicy(Qt::CustomContextMenu);
1558         connect(tb, SIGNAL(customContextMenuRequested(const QPoint &)),
1559                 this, SLOT(showContextMenu(const QPoint &)));
1560         connect(tb, SIGNAL(tabCloseRequested(int)),
1561                 this, SLOT(closeTab(int)));
1562
1563         setUsesScrollButtons(true);
1564 }
1565
1566
1567 void TabWorkArea::paintEvent(QPaintEvent * event)
1568 {
1569         if (tabBar()->isVisible()) {
1570                 QTabWidget::paintEvent(event);
1571         } else {
1572                 // Prevent the selected tab to influence the
1573                 // painting of the frame of the tab widget.
1574                 // This is needed for gtk style in Qt.
1575                 QStylePainter p(this);
1576 #if QT_VERSION < 0x050000
1577                 QStyleOptionTabWidgetFrameV2 opt;
1578 #else
1579                 QStyleOptionTabWidgetFrame opt;
1580 #endif
1581                 initStyleOption(&opt);
1582                 opt.rect = style()->subElementRect(QStyle::SE_TabWidgetTabPane,
1583                         &opt, this);
1584                 opt.selectedTabRect = QRect();
1585                 p.drawPrimitive(QStyle::PE_FrameTabWidget, opt);
1586         }
1587 }
1588
1589
1590 void TabWorkArea::mouseDoubleClickEvent(QMouseEvent * event)
1591 {
1592         if (event->button() != Qt::LeftButton)
1593                 return;
1594
1595         // return early if double click on existing tabs
1596         for (int i = 0; i < count(); ++i)
1597                 if (tabBar()->tabRect(i).contains(event->pos()))
1598                         return;
1599
1600         dispatch(FuncRequest(LFUN_BUFFER_NEW));
1601 }
1602
1603
1604 void TabWorkArea::setFullScreen(bool full_screen)
1605 {
1606         for (int i = 0; i != count(); ++i) {
1607                 if (GuiWorkArea * wa = workArea(i))
1608                         wa->setFullScreen(full_screen);
1609         }
1610
1611         if (lyxrc.full_screen_tabbar)
1612                 showBar(!full_screen && count() > 1);
1613         else
1614                 showBar(count() > 1);
1615 }
1616
1617
1618 void TabWorkArea::showBar(bool show)
1619 {
1620         tabBar()->setEnabled(show);
1621         tabBar()->setVisible(show);
1622         closeBufferButton->setVisible(show && lyxrc.single_close_tab_button);
1623         setTabsClosable(!lyxrc.single_close_tab_button);
1624 }
1625
1626
1627 GuiWorkArea * TabWorkArea::currentWorkArea()
1628 {
1629         if (count() == 0)
1630                 return 0;
1631
1632         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(currentWidget());
1633         LATTEST(wa);
1634         return wa;
1635 }
1636
1637
1638 GuiWorkArea * TabWorkArea::workArea(int index)
1639 {
1640         return dynamic_cast<GuiWorkArea *>(widget(index));
1641 }
1642
1643
1644 GuiWorkArea * TabWorkArea::workArea(Buffer & buffer)
1645 {
1646         // FIXME: this method doesn't work if we have more than work area
1647         // showing the same buffer.
1648         for (int i = 0; i != count(); ++i) {
1649                 GuiWorkArea * wa = workArea(i);
1650                 LASSERT(wa, return 0);
1651                 if (&wa->bufferView().buffer() == &buffer)
1652                         return wa;
1653         }
1654         return 0;
1655 }
1656
1657
1658 void TabWorkArea::closeAll()
1659 {
1660         while (count()) {
1661                 GuiWorkArea * wa = workArea(0);
1662                 LASSERT(wa, return);
1663                 removeTab(0);
1664                 delete wa;
1665         }
1666 }
1667
1668
1669 bool TabWorkArea::setCurrentWorkArea(GuiWorkArea * work_area)
1670 {
1671         LASSERT(work_area, return false);
1672         int index = indexOf(work_area);
1673         if (index == -1)
1674                 return false;
1675
1676         if (index == currentIndex())
1677                 // Make sure the work area is up to date.
1678                 on_currentTabChanged(index);
1679         else
1680                 // Switch to the work area.
1681                 setCurrentIndex(index);
1682         work_area->setFocus();
1683
1684         return true;
1685 }
1686
1687
1688 GuiWorkArea * TabWorkArea::addWorkArea(Buffer & buffer, GuiView & view)
1689 {
1690         GuiWorkArea * wa = new GuiWorkArea(buffer, view);
1691         wa->setUpdatesEnabled(false);
1692         // Hide tabbar if there's no tab (avoid a resize and a flashing tabbar
1693         // when hiding it again below).
1694         if (!(currentWorkArea() && currentWorkArea()->isFullScreen()))
1695                 showBar(count() > 0);
1696         addTab(wa, wa->windowTitle());
1697         QObject::connect(wa, SIGNAL(titleChanged(GuiWorkArea *)),
1698                 this, SLOT(updateTabTexts()));
1699         if (currentWorkArea() && currentWorkArea()->isFullScreen())
1700                 setFullScreen(true);
1701         else
1702                 // Hide tabbar if there's only one tab.
1703                 showBar(count() > 1);
1704
1705         updateTabTexts();
1706
1707         return wa;
1708 }
1709
1710
1711 bool TabWorkArea::removeWorkArea(GuiWorkArea * work_area)
1712 {
1713         LASSERT(work_area, return false);
1714         int index = indexOf(work_area);
1715         if (index == -1)
1716                 return false;
1717
1718         work_area->setUpdatesEnabled(false);
1719         removeTab(index);
1720         delete work_area;
1721
1722         if (count()) {
1723                 // make sure the next work area is enabled.
1724                 currentWidget()->setUpdatesEnabled(true);
1725                 if (currentWorkArea() && currentWorkArea()->isFullScreen())
1726                         setFullScreen(true);
1727                 else
1728                         // Show tabbar only if there's more than one tab.
1729                         showBar(count() > 1);
1730         } else
1731                 lastWorkAreaRemoved();
1732
1733         updateTabTexts();
1734
1735         return true;
1736 }
1737
1738
1739 void TabWorkArea::on_currentTabChanged(int i)
1740 {
1741         // returns e.g. on application destruction
1742         if (i == -1)
1743                 return;
1744         GuiWorkArea * wa = workArea(i);
1745         LASSERT(wa, return);
1746         wa->setUpdatesEnabled(true);
1747         wa->redraw(true);
1748         wa->setFocus();
1749         ///
1750         currentWorkAreaChanged(wa);
1751
1752         LYXERR(Debug::GUI, "currentTabChanged " << i
1753                 << " File: " << wa->bufferView().buffer().absFileName());
1754 }
1755
1756
1757 void TabWorkArea::closeCurrentBuffer()
1758 {
1759         GuiWorkArea * wa;
1760         if (clicked_tab_ == -1)
1761                 wa = currentWorkArea();
1762         else {
1763                 wa = workArea(clicked_tab_);
1764                 LASSERT(wa, return);
1765         }
1766         wa->view().closeWorkArea(wa);
1767 }
1768
1769
1770 void TabWorkArea::hideCurrentTab()
1771 {
1772         GuiWorkArea * wa;
1773         if (clicked_tab_ == -1)
1774                 wa = currentWorkArea();
1775         else {
1776                 wa = workArea(clicked_tab_);
1777                 LASSERT(wa, return);
1778         }
1779         wa->view().hideWorkArea(wa);
1780 }
1781
1782
1783 void TabWorkArea::closeTab(int index)
1784 {
1785         on_currentTabChanged(index);
1786         GuiWorkArea * wa;
1787         if (index == -1)
1788                 wa = currentWorkArea();
1789         else {
1790                 wa = workArea(index);
1791                 LASSERT(wa, return);
1792         }
1793         wa->view().closeWorkArea(wa);
1794 }
1795
1796
1797 ///
1798 class DisplayPath {
1799 public:
1800         /// make vector happy
1801         DisplayPath() {}
1802         ///
1803         DisplayPath(int tab, FileName const & filename)
1804                 : tab_(tab)
1805         {
1806                 filename_ = (filename.extension() == "lyx") ?
1807                         toqstr(filename.onlyFileNameWithoutExt())
1808                         : toqstr(filename.onlyFileName());
1809                 postfix_ = toqstr(filename.absoluteFilePath()).
1810                         split("/", QString::SkipEmptyParts);
1811                 postfix_.pop_back();
1812                 abs_ = toqstr(filename.absoluteFilePath());
1813                 dottedPrefix_ = false;
1814         }
1815
1816         /// Absolute path for debugging.
1817         QString abs() const
1818         {
1819                 return abs_;
1820         }
1821         /// Add the first segment from the postfix or three dots to the prefix.
1822         /// Merge multiple dot tripples. In fact dots are added lazily, i.e. only
1823         /// when really needed.
1824         void shiftPathSegment(bool dotted)
1825         {
1826                 if (postfix_.count() <= 0)
1827                         return;
1828
1829                 if (!dotted) {
1830                         if (dottedPrefix_ && !prefix_.isEmpty())
1831                                 prefix_ += ".../";
1832                         prefix_ += postfix_.front() + "/";
1833                 }
1834                 dottedPrefix_ = dotted && !prefix_.isEmpty();
1835                 postfix_.pop_front();
1836         }
1837         ///
1838         QString displayString() const
1839         {
1840                 if (prefix_.isEmpty())
1841                         return filename_;
1842
1843                 bool dots = dottedPrefix_ || !postfix_.isEmpty();
1844                 return prefix_ + (dots ? ".../" : "") + filename_;
1845         }
1846         ///
1847         QString forecastPathString() const
1848         {
1849                 if (postfix_.count() == 0)
1850                         return displayString();
1851
1852                 return prefix_
1853                         + (dottedPrefix_ ? ".../" : "")
1854                         + postfix_.front() + "/";
1855         }
1856         ///
1857         bool final() const { return postfix_.empty(); }
1858         ///
1859         int tab() const { return tab_; }
1860
1861 private:
1862         ///
1863         QString prefix_;
1864         ///
1865         QStringList postfix_;
1866         ///
1867         QString filename_;
1868         ///
1869         QString abs_;
1870         ///
1871         int tab_;
1872         ///
1873         bool dottedPrefix_;
1874 };
1875
1876
1877 ///
1878 bool operator<(DisplayPath const & a, DisplayPath const & b)
1879 {
1880         return a.displayString() < b.displayString();
1881 }
1882
1883 ///
1884 bool operator==(DisplayPath const & a, DisplayPath const & b)
1885 {
1886         return a.displayString() == b.displayString();
1887 }
1888
1889
1890 void TabWorkArea::updateTabTexts()
1891 {
1892         size_t n = count();
1893         if (n == 0)
1894                 return;
1895         std::list<DisplayPath> paths;
1896         typedef std::list<DisplayPath>::iterator It;
1897
1898         // collect full names first: path into postfix, empty prefix and
1899         // filename without extension
1900         for (size_t i = 0; i < n; ++i) {
1901                 GuiWorkArea * i_wa = workArea(i);
1902                 FileName const fn = i_wa->bufferView().buffer().fileName();
1903                 paths.push_back(DisplayPath(i, fn));
1904         }
1905
1906         // go through path segments and see if it helps to make the path more unique
1907         bool somethingChanged = true;
1908         bool allFinal = false;
1909         while (somethingChanged && !allFinal) {
1910                 // adding path segments changes order
1911                 paths.sort();
1912
1913                 LYXERR(Debug::GUI, "updateTabTexts() iteration start");
1914                 somethingChanged = false;
1915                 allFinal = true;
1916
1917                 // find segments which are not unique (i.e. non-atomic)
1918                 It it = paths.begin();
1919                 It segStart = it;
1920                 QString segString = it->displayString();
1921                 for (; it != paths.end(); ++it) {
1922                         // look to the next item
1923                         It next = it;
1924                         ++next;
1925
1926                         // final?
1927                         allFinal = allFinal && it->final();
1928
1929                         LYXERR(Debug::GUI, "it = " << it->abs()
1930                                << " => " << it->displayString());
1931
1932                         // still the same segment?
1933                         QString nextString;
1934                         if ((next != paths.end()
1935                              && (nextString = next->displayString()) == segString))
1936                                 continue;
1937                         LYXERR(Debug::GUI, "segment ended");
1938
1939                         // only a trivial one with one element?
1940                         if (it == segStart) {
1941                                 // start new segment
1942                                 segStart = next;
1943                                 segString = nextString;
1944                                 continue;
1945                         }
1946
1947                         // we found a non-atomic segment segStart <= sit <= it < next.
1948                         // Shift path segments and hope for the best
1949                         // that it makes the path more unique.
1950                         somethingChanged = true;
1951                         It sit = segStart;
1952                         QString dspString = sit->forecastPathString();
1953                         LYXERR(Debug::GUI, "first forecast found for "
1954                                << sit->abs() << " => " << dspString);
1955                         ++sit;
1956                         bool moreUnique = false;
1957                         for (; sit != next; ++sit) {
1958                                 if (sit->forecastPathString() != dspString) {
1959                                         LYXERR(Debug::GUI, "different forecast found for "
1960                                                 << sit->abs() << " => " << sit->forecastPathString());
1961                                         moreUnique = true;
1962                                         break;
1963                                 }
1964                                 LYXERR(Debug::GUI, "same forecast found for "
1965                                         << sit->abs() << " => " << dspString);
1966                         }
1967
1968                         // if the path segment helped, add it. Otherwise add dots
1969                         bool dots = !moreUnique;
1970                         LYXERR(Debug::GUI, "using dots = " << dots);
1971                         for (sit = segStart; sit != next; ++sit) {
1972                                 sit->shiftPathSegment(dots);
1973                                 LYXERR(Debug::GUI, "shifting "
1974                                         << sit->abs() << " => " << sit->displayString());
1975                         }
1976
1977                         // start new segment
1978                         segStart = next;
1979                         segString = nextString;
1980                 }
1981         }
1982
1983         // set new tab titles
1984         for (It it = paths.begin(); it != paths.end(); ++it) {
1985                 int const tab_index = it->tab();
1986                 Buffer const & buf = workArea(tab_index)->bufferView().buffer();
1987                 QString tab_text = it->displayString().replace("&", "&&");
1988                 if (!buf.fileName().empty() && !buf.isClean())
1989                         tab_text += "*";
1990                 setTabText(tab_index, tab_text);
1991                 setTabToolTip(tab_index, it->abs());
1992         }
1993 }
1994
1995
1996 void TabWorkArea::showContextMenu(const QPoint & pos)
1997 {
1998         // which tab?
1999         clicked_tab_ = static_cast<DragTabBar *>(tabBar())->tabAt(pos);
2000         if (clicked_tab_ == -1)
2001                 return;
2002
2003         // show tab popup
2004         QMenu popup;
2005         popup.addAction(QIcon(getPixmap("images/", "hidetab", "png")),
2006                 qt_("Hide tab"), this, SLOT(hideCurrentTab()));
2007         popup.addAction(QIcon(getPixmap("images/", "closetab", "png")),
2008                 qt_("Close tab"), this, SLOT(closeCurrentBuffer()));
2009         popup.exec(tabBar()->mapToGlobal(pos));
2010
2011         clicked_tab_ = -1;
2012 }
2013
2014
2015 void TabWorkArea::moveTab(int fromIndex, int toIndex)
2016 {
2017         QWidget * w = widget(fromIndex);
2018         QIcon icon = tabIcon(fromIndex);
2019         QString text = tabText(fromIndex);
2020
2021         setCurrentIndex(fromIndex);
2022         removeTab(fromIndex);
2023         insertTab(toIndex, w, icon, text);
2024         setCurrentIndex(toIndex);
2025 }
2026
2027
2028 DragTabBar::DragTabBar(QWidget* parent)
2029         : QTabBar(parent)
2030 {
2031         setAcceptDrops(true);
2032         setTabsClosable(!lyxrc.single_close_tab_button);
2033 }
2034
2035
2036 void DragTabBar::mousePressEvent(QMouseEvent * event)
2037 {
2038         if (event->button() == Qt::LeftButton)
2039                 dragStartPos_ = event->pos();
2040         QTabBar::mousePressEvent(event);
2041 }
2042
2043
2044 void DragTabBar::mouseMoveEvent(QMouseEvent * event)
2045 {
2046         // If the left button isn't pressed anymore then return
2047         if (!(event->buttons() & Qt::LeftButton))
2048                 return;
2049
2050         // If the distance is too small then return
2051         if ((event->pos() - dragStartPos_).manhattanLength()
2052             < QApplication::startDragDistance())
2053                 return;
2054
2055         // did we hit something after all?
2056         int tab = tabAt(dragStartPos_);
2057         if (tab == -1)
2058                 return;
2059
2060         // simulate button release to remove highlight from button
2061         int i = currentIndex();
2062         QMouseEvent me(QEvent::MouseButtonRelease, dragStartPos_,
2063                 event->button(), event->buttons(), 0);
2064         QTabBar::mouseReleaseEvent(&me);
2065         setCurrentIndex(i);
2066
2067         // initiate Drag
2068         QDrag * drag = new QDrag(this);
2069         QMimeData * mimeData = new QMimeData;
2070         // a crude way to distinguish tab-reodering drops from other ones
2071         mimeData->setData("action", "tab-reordering") ;
2072         drag->setMimeData(mimeData);
2073
2074         // get tab pixmap as cursor
2075         QRect r = tabRect(tab);
2076         QPixmap pixmap(r.size());
2077         render(&pixmap, - r.topLeft());
2078         drag->setPixmap(pixmap);
2079         drag->exec();
2080 }
2081
2082
2083 void DragTabBar::dragEnterEvent(QDragEnterEvent * event)
2084 {
2085         // Only accept if it's an tab-reordering request
2086         QMimeData const * m = event->mimeData();
2087         QStringList formats = m->formats();
2088         if (formats.contains("action")
2089             && m->data("action") == "tab-reordering")
2090                 event->acceptProposedAction();
2091 }
2092
2093
2094 void DragTabBar::dropEvent(QDropEvent * event)
2095 {
2096         int fromIndex = tabAt(dragStartPos_);
2097         int toIndex = tabAt(event->pos());
2098
2099         // Tell interested objects that
2100         if (fromIndex != toIndex)
2101                 tabMoveRequested(fromIndex, toIndex);
2102         event->acceptProposedAction();
2103 }
2104
2105
2106 } // namespace frontend
2107 } // namespace lyx
2108
2109 #include "moc_GuiWorkArea.cpp"