src/frontends/qt4/GuiWorkArea.cpp

   1 /**
   2  * \file GuiWorkArea.cpp
   3  * This file is part of LyX, the document processor.
   4  * Licence details can be found in the file COPYING.
   5  *
   6  * \author John Levon
   7  * \author Abdelrazak Younes
   8  *
   9  * Full author contact details are available in file CREDITS.
  10  */
  11
  12 #include <config.h>
  13
  14 #include "GuiWorkArea.h"
  15 #include "GuiWorkArea_Private.h"
  16
  17 #include "ColorCache.h"
  18 #include "FontLoader.h"
  19 #include "Menus.h"
  20
  21 #include "Buffer.h"
  22 #include "BufferList.h"
  23 #include "BufferParams.h"
  24 #include "BufferView.h"
  25 #include "CoordCache.h"
  26 #include "Cursor.h"
  27 #include "Font.h"
  28 #include "FuncRequest.h"
  29 #include "GuiApplication.h"
  30 #include "GuiCompleter.h"
  31 #include "GuiKeySymbol.h"
  32 #include "GuiPainter.h"
  33 #include "GuiView.h"
  34 #include "KeySymbol.h"
  35 #include "Language.h"
  36 #include "LyX.h"
  37 #include "LyXRC.h"
  38 #include "LyXVC.h"
  39 #include "qt_helpers.h"
  40 #include "Text.h"
  41 #include "TextMetrics.h"
  42 #include "version.h"
  43
  44 #include "graphics/GraphicsImage.h"
  45 #include "graphics/GraphicsLoader.h"
  46
  47 #include "support/convert.h"
  48 #include "support/debug.h"
  49 #include "support/gettext.h"
  50 #include "support/FileName.h"
  51 #include "support/lassert.h"
  52 #include "support/TempFile.h"
  53
  54 #include "frontends/Application.h"
  55 #include "frontends/FontMetrics.h"
  56 #include "frontends/WorkAreaManager.h"
  57
  58 #include <QContextMenuEvent>
  59 #if (QT_VERSION < 0x050000)
  60 #include <QInputContext>
  61 #endif
  62 #include <QDrag>
  63 #include <QHelpEvent>
  64 #ifdef Q_OS_MAC
  65 #include <QProxyStyle>
  66 #endif
  67 #include <QMainWindow>
  68 #include <QMimeData>
  69 #include <QMenu>
  70 #include <QPainter>
  71 #include <QPalette>
  72 #include <QPixmapCache>
  73 #include <QScrollBar>
  74 #include <QStyleOption>
  75 #include <QStylePainter>
  76 #include <QTimer>
  77 #include <QToolButton>
  78 #include <QToolTip>
  79 #include <QMenuBar>
  80
  81 #include "support/bind.h"
  82
  83 #include <cmath>
  84
  85 int const TabIndicatorWidth = 3;
  86
  87 #undef KeyPress
  88 #undef NoModifier
  89
  90 using namespace std;
  91 using namespace lyx::support;
  92
  93 namespace lyx {
  94
  95
  96 /// return the LyX mouse button state from Qt's
  97 static mouse_button::state q_button_state(Qt::MouseButton button)
  98 {
  99         mouse_button::state b = mouse_button::none;
 100         switch (button) {
 101                 case Qt::LeftButton:
 102                         b = mouse_button::button1;
 103                         break;
 104                 case Qt::MidButton:
 105                         b = mouse_button::button2;
 106                         break;
 107                 case Qt::RightButton:
 108                         b = mouse_button::button3;
 109                         break;
 110                 default:
 111                         break;
 112         }
 113         return b;
 114 }
 115
 116
 117 /// return the LyX mouse button state from Qt's
 118 mouse_button::state q_motion_state(Qt::MouseButtons state)
 119 {
 120         mouse_button::state b = mouse_button::none;
 121         if (state & Qt::LeftButton)
 122                 b |= mouse_button::button1;
 123         if (state & Qt::MidButton)
 124                 b |= mouse_button::button2;
 125         if (state & Qt::RightButton)
 126                 b |= mouse_button::button3;
 127         return b;
 128 }
 129
 130
 131 namespace frontend {
 132
 133 class CursorWidget {
 134 public:
 135         CursorWidget() {
 136                 recomputeWidth();
 137         }
 138
 139         void draw(QPainter & painter)
 140         {
 141                 if (!show_ || !rect_.isValid())
 142                         return;
 143
 144                 int y = rect_.top();
 145                 int l = x_ - rect_.left();
 146                 int r = rect_.right() - x_;
 147                 int bot = rect_.bottom();
 148
 149                 // draw vertical line
 150                 painter.fillRect(x_, y, cursor_width_, rect_.height(), color_);
 151
 152                 // draw RTL/LTR indication
 153                 painter.setPen(color_);
 154                 if (l_shape_) {
 155                         if (rtl_)
 156                                 painter.drawLine(x_, bot, x_ - l, bot);
 157                         else
 158                                 painter.drawLine(x_, bot, x_ + cursor_width_ + r, bot);
 159                 }
 160
 161                 // draw completion triangle
 162                 if (completable_) {
 163                         int m = y + rect_.height() / 2;
 164                         int d = TabIndicatorWidth - 1;
 165                         if (rtl_) {
 166                                 painter.drawLine(x_ - 1, m - d, x_ - 1 - d, m);
 167                                 painter.drawLine(x_ - 1, m + d, x_ - 1 - d, m);
 168                         } else {
 169                                 painter.drawLine(x_ + cursor_width_, m - d, x_ + cursor_width_ + d, m);
 170                                 painter.drawLine(x_ + cursor_width_, m + d, x_ + cursor_width_ + d, m);
 171                         }
 172                 }
 173         }
 174
 175         void update(int x, int y, int h, bool l_shape,
 176                 bool rtl, bool completable)
 177         {
 178                 color_ = guiApp->colorCache().get(Color_cursor);
 179                 l_shape_ = l_shape;
 180                 rtl_ = rtl;
 181                 completable_ = completable;
 182                 x_ = x;
 183
 184                 // extension to left and right
 185                 int l = 0;
 186                 int r = 0;
 187
 188                 // RTL/LTR indication
 189                 if (l_shape_) {
 190                         if (rtl)
 191                                 l += h / 3;
 192                         else
 193                                 r += h / 3;
 194                 }
 195
 196                 // completion triangle
 197                 if (completable_) {
 198                         if (rtl)
 199                                 l = max(l, TabIndicatorWidth);
 200                         else
 201                                 r = max(r, TabIndicatorWidth);
 202                 }
 203
 204                 // compute overall rectangle
 205                 rect_ = QRect(x - l, y, cursor_width_ + r + l, h);
 206         }
 207
 208         void show(bool set_show = true) { show_ = set_show; }
 209         void hide() { show_ = false; }
 210         int cursorWidth() const { return cursor_width_; }
 211         void recomputeWidth() {
 212                 cursor_width_ = lyxrc.cursor_width
 213                         ? lyxrc.cursor_width
 214                         : 1 + int((lyxrc.zoom + 50) / 200.0);
 215         }
 216
 217         QRect const & rect() { return rect_; }
 218
 219 private:
 220         /// cursor is in RTL or LTR text
 221         bool rtl_;
 222         /// indication for RTL or LTR
 223         bool l_shape_;
 224         /// triangle to show that a completion is available
 225         bool completable_;
 226         ///
 227         bool show_;
 228         ///
 229         QColor color_;
 230         /// rectangle, possibly with l_shape and completion triangle
 231         QRect rect_;
 232         /// x position (were the vertical line is drawn)
 233         int x_;
 234
 235         int cursor_width_;
 236 };
 237
 238
 239 // This is a 'heartbeat' generating synthetic mouse move events when the
 240 // cursor is at the top or bottom edge of the viewport. One scroll per 0.2 s
 241 SyntheticMouseEvent::SyntheticMouseEvent()
 242         : timeout(200), restart_timeout(true)
 243 {}
 244
 245
 246 GuiWorkArea::Private::Private(GuiWorkArea * parent)
 247 : p(parent), screen_(0), buffer_view_(0), lyx_view_(0), cursor_visible_(false),
 248 need_resize_(false), schedule_redraw_(false), preedit_lines_(1),
 249 pixel_ratio_(1.0),
 250 completer_(new GuiCompleter(p, p))
 251 {
 252 }
 253
 254
 255 GuiWorkArea::GuiWorkArea(QWidget * /* w */)
 256 : d(new Private(this))
 257 {
 258 }
 259
 260
 261 GuiWorkArea::GuiWorkArea(Buffer & buffer, GuiView & gv)
 262 : d(new Private(this))
 263 {
 264         setGuiView(gv);
 265         buffer.params().display_pixel_ratio = theGuiApp()->pixelRatio();
 266         setBuffer(buffer);
 267         init();
 268 }
 269
 270
 271 double GuiWorkArea::pixelRatio() const
 272 {
 273 #if QT_VERSION >= 0x050000
 274         return devicePixelRatio();
 275 #else
 276         return 1.0;
 277 #endif
 278 }
 279
 280
 281 void GuiWorkArea::init()
 282 {
 283         // Setup the signals
 284         connect(&d->cursor_timeout_, SIGNAL(timeout()),
 285                 this, SLOT(toggleCursor()));
 286
 287         int const time = QApplication::cursorFlashTime() / 2;
 288         if (time > 0) {
 289                 d->cursor_timeout_.setInterval(time);
 290                 d->cursor_timeout_.start();
 291         } else {
 292                 // let's initialize this just to be safe
 293                 d->cursor_timeout_.setInterval(500);
 294         }
 295
 296         d->resetScreen();
 297         // With Qt4.5 a mouse event will happen before the first paint event
 298         // so make sure that the buffer view has an up to date metrics.
 299         d->buffer_view_->resize(viewport()->width(), viewport()->height());
 300         d->cursor_ = new frontend::CursorWidget();
 301         d->cursor_->hide();
 302
 303         setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 304         setAcceptDrops(true);
 305         setMouseTracking(true);
 306         setMinimumSize(100, 70);
 307         setFrameStyle(QFrame::NoFrame);
 308         updateWindowTitle();
 309
 310         viewport()->setAutoFillBackground(false);
 311         // We don't need double-buffering nor SystemBackground on
 312         // the viewport because we have our own backing pixmap.
 313         viewport()->setAttribute(Qt::WA_NoSystemBackground);
 314
 315         setFocusPolicy(Qt::StrongFocus);
 316
 317         d->setCursorShape(Qt::IBeamCursor);
 318
 319         d->synthetic_mouse_event_.timeout.timeout.connect(
 320                 bind(&GuiWorkArea::generateSyntheticMouseEvent,
 321                                         this));
 322
 323         // Initialize the vertical Scroll Bar
 324         QObject::connect(verticalScrollBar(), SIGNAL(valueChanged(int)),
 325                 this, SLOT(scrollTo(int)));
 326
 327         LYXERR(Debug::GUI, "viewport width: " << viewport()->width()
 328                 << "  viewport height: " << viewport()->height());
 329
 330         // Enables input methods for asian languages.
 331         // Must be set when creating custom text editing widgets.
 332         setAttribute(Qt::WA_InputMethodEnabled, true);
 333
 334         d->dialog_mode_ = false;
 335 }
 336
 337
 338 GuiWorkArea::~GuiWorkArea()
 339 {
 340         d->buffer_view_->buffer().workAreaManager().remove(this);
 341         delete d->screen_;
 342         delete d->buffer_view_;
 343         delete d->cursor_;
 344         // Completer has a QObject parent and is thus automatically destroyed.
 345         // See #4758.
 346         // delete completer_;
 347         delete d;
 348 }
 349
 350
 351 Qt::CursorShape GuiWorkArea::cursorShape() const
 352 {
 353         return viewport()->cursor().shape();
 354 }
 355
 356
 357 void GuiWorkArea::Private::setCursorShape(Qt::CursorShape shape)
 358 {
 359         p->viewport()->setCursor(shape);
 360 }
 361
 362
 363 void GuiWorkArea::Private::updateCursorShape()
 364 {
 365         setCursorShape(buffer_view_->clickableInset()
 366                 ? Qt::PointingHandCursor : Qt::IBeamCursor);
 367 }
 368
 369
 370 void GuiWorkArea::setGuiView(GuiView & gv)
 371 {
 372         d->lyx_view_ = &gv;
 373 }
 374
 375
 376 void GuiWorkArea::setBuffer(Buffer & buffer)
 377 {
 378         delete d->buffer_view_;
 379         d->buffer_view_ = new BufferView(buffer);
 380         buffer.workAreaManager().add(this);
 381
 382         // HACK: Prevents an additional redraw when the scrollbar pops up
 383         // which regularily happens on documents with more than one page.
 384         // The policy  should be set to "Qt::ScrollBarAsNeeded" soon.
 385         // Since we have no geometry information yet, we assume that
 386         // a document needs a scrollbar if there is more then four
 387         // paragraph in the outermost text.
 388         if (buffer.text().paragraphs().size() > 4)
 389                 setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
 390         QTimer::singleShot(50, this, SLOT(fixVerticalScrollBar()));
 391 }
 392
 393
 394 void GuiWorkArea::fixVerticalScrollBar()
 395 {
 396         if (!isFullScreen())
 397                 setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
 398 }
 399
 400
 401 void GuiWorkArea::close()
 402 {
 403         d->lyx_view_->removeWorkArea(this);
 404 }
 405
 406
 407 void GuiWorkArea::setFullScreen(bool full_screen)
 408 {
 409         d->buffer_view_->setFullScreen(full_screen);
 410         setFrameStyle(QFrame::NoFrame);
 411         if (full_screen) {
 412                 setFrameStyle(QFrame::NoFrame);
 413                 if (lyxrc.full_screen_scrollbar)
 414                         setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 415         } else
 416                 setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
 417 }
 418
 419
 420 BufferView & GuiWorkArea::bufferView()
 421 {
 422         return *d->buffer_view_;
 423 }
 424
 425
 426 BufferView const & GuiWorkArea::bufferView() const
 427 {
 428         return *d->buffer_view_;
 429 }
 430
 431
 432 void GuiWorkArea::stopBlinkingCursor()
 433 {
 434         d->cursor_timeout_.stop();
 435         d->hideCursor();
 436 }
 437
 438
 439 void GuiWorkArea::startBlinkingCursor()
 440 {
 441         // do not show the cursor if the view is busy
 442         if (view().busy())
 443                 return;
 444
 445         Point p;
 446         int h = 0;
 447         d->buffer_view_->cursorPosAndHeight(p, h);
 448         // Don't start blinking if the cursor isn't on screen.
 449         if (!d->buffer_view_->cursorInView(p, h))
 450                 return;
 451
 452         d->showCursor();
 453
 454         //we're not supposed to cache this value.
 455         int const time = QApplication::cursorFlashTime() / 2;
 456         if (time <= 0)
 457                 return;
 458         d->cursor_timeout_.setInterval(time);
 459         d->cursor_timeout_.start();
 460 }
 461
 462
 463 void GuiWorkArea::redraw(bool update_metrics)
 464 {
 465         if (!isVisible())
 466                 // No need to redraw in this case.
 467                 return;
 468
 469         // No need to do anything if this is the current view. The BufferView
 470         // metrics are already up to date.
 471         if (update_metrics || d->lyx_view_ != guiApp->currentView()
 472                 || d->lyx_view_->currentWorkArea() != this) {
 473                 // FIXME: it would be nice to optimize for the off-screen case.
 474                 d->buffer_view_->cursor().fixIfBroken();
 475                 d->buffer_view_->updateMetrics();
 476                 d->buffer_view_->cursor().fixIfBroken();
 477         }
 478
 479         // update cursor position, because otherwise it has to wait until
 480         // the blinking interval is over
 481         if (d->cursor_visible_) {
 482                 d->hideCursor();
 483                 d->showCursor();
 484         }
 485
 486         LYXERR(Debug::WORKAREA, "WorkArea::redraw screen");
 487         d->updateScreen();
 488         update(0, 0, viewport()->width(), viewport()->height());
 489
 490         /// \warning: scrollbar updating *must* be done after the BufferView is drawn
 491         /// because \c BufferView::updateScrollbar() is called in \c BufferView::draw().
 492         d->updateScrollbar();
 493         d->lyx_view_->updateStatusBar();
 494
 495         if (lyxerr.debugging(Debug::WORKAREA))
 496                 d->buffer_view_->coordCache().dump();
 497
 498         updateWindowTitle();
 499
 500         d->updateCursorShape();
 501 }
 502
 503
 504 void GuiWorkArea::processKeySym(KeySymbol const & key, KeyModifier mod)
 505 {
 506         if (d->lyx_view_->isFullScreen() && d->lyx_view_->menuBar()->isVisible()
 507                 && lyxrc.full_screen_menubar) {
 508                 // FIXME HACK: we should not have to do this here. See related comment
 509                 // in GuiView::event() (QEvent::ShortcutOverride)
 510                 d->lyx_view_->menuBar()->hide();
 511         }
 512
 513         // In order to avoid bad surprise in the middle of an operation,
 514         // we better stop the blinking cursor...
 515         // the cursor gets restarted in GuiView::restartCursor()
 516         stopBlinkingCursor();
 517         guiApp->processKeySym(key, mod);
 518 }
 519
 520
 521 void GuiWorkArea::Private::dispatch(FuncRequest const & cmd0, KeyModifier mod)
 522 {
 523         // Handle drag&drop
 524         if (cmd0.action() == LFUN_FILE_OPEN) {
 525                 DispatchResult dr;
 526                 lyx_view_->dispatch(cmd0, dr);
 527                 return;
 528         }
 529
 530         FuncRequest cmd;
 531
 532         if (cmd0.action() == LFUN_MOUSE_PRESS) {
 533                 if (mod == ShiftModifier)
 534                         cmd = FuncRequest(cmd0, "region-select");
 535                 else if (mod == ControlModifier)
 536                         cmd = FuncRequest(cmd0, "paragraph-select");
 537                 else
 538                         cmd = cmd0;
 539         }
 540         else
 541                 cmd = cmd0;
 542
 543         bool const notJustMovingTheMouse =
 544                 cmd.action() != LFUN_MOUSE_MOTION || cmd.button() != mouse_button::none;
 545
 546         // In order to avoid bad surprise in the middle of an operation, we better stop
 547         // the blinking cursor.
 548         if (notJustMovingTheMouse)
 549                 p->stopBlinkingCursor();
 550
 551         buffer_view_->mouseEventDispatch(cmd);
 552
 553         // Skip these when selecting
 554         // FIXME: let GuiView take care of those.
 555         if (cmd.action() != LFUN_MOUSE_MOTION) {
 556                 completer_->updateVisibility(false, false);
 557                 lyx_view_->updateDialogs();
 558                 lyx_view_->updateStatusBar();
 559         }
 560
 561         // GUI tweaks except with mouse motion with no button pressed.
 562         if (notJustMovingTheMouse) {
 563                 // Slight hack: this is only called currently when we
 564                 // clicked somewhere, so we force through the display
 565                 // of the new status here.
 566                 // FIXME: let GuiView take care of those.
 567                 lyx_view_->clearMessage();
 568
 569                 // Show the cursor immediately after any operation
 570                 p->startBlinkingCursor();
 571         }
 572
 573         updateCursorShape();
 574 }
 575
 576
 577 void GuiWorkArea::Private::resizeBufferView()
 578 {
 579         // WARNING: Please don't put any code that will trigger a repaint here!
 580         // We are already inside a paint event.
 581         p->stopBlinkingCursor();
 582         // Warn our container (GuiView).
 583         p->busy(true);
 584
 585         Point point;
 586         int h = 0;
 587         buffer_view_->cursorPosAndHeight(point, h);
 588         bool const cursor_in_view = buffer_view_->cursorInView(point, h);
 589         buffer_view_->resize(p->viewport()->width(), p->viewport()->height());
 590         if (cursor_in_view)
 591                 buffer_view_->scrollToCursor();
 592         updateScreen();
 593
 594         // Update scrollbars which might have changed due different
 595         // BufferView dimension. This is especially important when the
 596         // BufferView goes from zero-size to the real-size for the first time,
 597         // as the scrollbar paramters are then set for the first time.
 598         updateScrollbar();
 599
 600         need_resize_ = false;
 601         p->busy(false);
 602         // Eventually, restart the cursor after the resize event.
 603         // We might be resizing even if the focus is on another widget so we only
 604         // restart the cursor if we have the focus.
 605         if (p->hasFocus())
 606                 QTimer::singleShot(50, p, SLOT(startBlinkingCursor()));
 607 }
 608
 609
 610 void GuiWorkArea::Private::showCursor()
 611 {
 612         if (cursor_visible_)
 613                 return;
 614
 615         Point p;
 616         int h = 0;
 617         buffer_view_->cursorPosAndHeight(p, h);
 618         if (!buffer_view_->cursorInView(p, h))
 619                 return;
 620
 621         // RTL or not RTL
 622         bool l_shape = false;
 623         Font const & realfont = buffer_view_->cursor().real_current_font;
 624         BufferParams const & bp = buffer_view_->buffer().params();
 625         bool const samelang = realfont.language() == bp.language;
 626         bool const isrtl = realfont.isVisibleRightToLeft();
 627
 628         if (!samelang || isrtl != bp.language->rightToLeft())
 629                 l_shape = true;
 630
 631         // The ERT language hack needs fixing up
 632         if (realfont.language() == latex_language)
 633                 l_shape = false;
 634
 635         // show cursor on screen
 636         Cursor & cur = buffer_view_->cursor();
 637         bool completable = cur.inset().showCompletionCursor()
 638                 && completer_->completionAvailable()
 639                 && !completer_->popupVisible()
 640                 && !completer_->inlineVisible();
 641         cursor_visible_ = true;
 642         cursor_->recomputeWidth();
 643
 644         //int cur_x = buffer_view_->getPos(cur).x_;
 645         // We may have decided to slide the cursor row so that cursor
 646         // is visible.
 647         p.x_ -= buffer_view_->horizScrollOffset();
 648
 649         showCursor(p.x_, p.y_, h, l_shape, isrtl, completable);
 650 }
 651
 652
 653 void GuiWorkArea::Private::hideCursor()
 654 {
 655         if (!cursor_visible_)
 656                 return;
 657
 658         cursor_visible_ = false;
 659         removeCursor();
 660 }
 661
 662
 663 void GuiWorkArea::toggleCursor()
 664 {
 665         if (d->cursor_visible_)
 666                 d->hideCursor();
 667         else
 668                 d->showCursor();
 669 }
 670
 671
 672 void GuiWorkArea::Private::updateScrollbar()
 673 {
 674         ScrollbarParameters const & scroll_ = buffer_view_->scrollbarParameters();
 675         // WARNING: don't touch at the scrollbar value like this:
 676         //   verticalScrollBar()->setValue(scroll_.position);
 677         // because this would cause a recursive signal/slot calling with
 678         // GuiWorkArea::scrollTo
 679         p->verticalScrollBar()->setRange(scroll_.min, scroll_.max);
 680         p->verticalScrollBar()->setPageStep(scroll_.page_step);
 681         p->verticalScrollBar()->setSingleStep(scroll_.single_step);
 682         p->verticalScrollBar()->setSliderPosition(scroll_.position);
 683 }
 684
 685
 686 void GuiWorkArea::scrollTo(int value)
 687 {
 688         stopBlinkingCursor();
 689         d->buffer_view_->scrollDocView(value, true);
 690
 691         if (lyxrc.cursor_follows_scrollbar) {
 692                 d->buffer_view_->setCursorFromScrollbar();
 693                 // FIXME: let GuiView take care of those.
 694                 d->lyx_view_->updateLayoutList();
 695         }
 696         // Show the cursor immediately after any operation.
 697         startBlinkingCursor();
 698 #ifdef Q_WS_X11
 699         QApplication::syncX();
 700 #endif
 701 }
 702
 703
 704 bool GuiWorkArea::event(QEvent * e)
 705 {
 706         switch (e->type()) {
 707         case QEvent::ToolTip: {
 708                 QHelpEvent * helpEvent = static_cast<QHelpEvent *>(e);
 709                 if (lyxrc.use_tooltip) {
 710                         QPoint pos = helpEvent->pos();
 711                         if (pos.x() < viewport()->width()) {
 712                                 QString s = toqstr(d->buffer_view_->toolTip(pos.x(), pos.y()));
 713                                 QToolTip::showText(helpEvent->globalPos(), s);
 714                         }
 715                         else
 716                                 QToolTip::hideText();
 717                 }
 718                 // Don't forget to accept the event!
 719                 e->accept();
 720                 return true;
 721         }
 722
 723         case QEvent::ShortcutOverride: {
 724                 // We catch this event in order to catch the Tab or Shift+Tab key press
 725                 // which are otherwise reserved to focus switching between controls
 726                 // within a dialog.
 727                 QKeyEvent * ke = static_cast<QKeyEvent*>(e);
 728                 if ((ke->key() == Qt::Key_Tab && ke->modifiers() == Qt::NoModifier)
 729                         || (ke->key() == Qt::Key_Backtab && (
 730                                 ke->modifiers() == Qt::ShiftModifier
 731                                 || ke->modifiers() == Qt::NoModifier))) {
 732                         keyPressEvent(ke);
 733                         return true;
 734                 }
 735                 return QAbstractScrollArea::event(e);
 736         }
 737
 738         default:
 739                 return QAbstractScrollArea::event(e);
 740         }
 741         return false;
 742 }
 743
 744
 745 void GuiWorkArea::contextMenuEvent(QContextMenuEvent * e)
 746 {
 747         string name;
 748         if (e->reason() == QContextMenuEvent::Mouse)
 749                 // the menu name is set on mouse press
 750                 name = d->context_menu_name_;
 751         else {
 752                 QPoint pos = e->pos();
 753                 Cursor const & cur = d->buffer_view_->cursor();
 754                 if (e->reason() == QContextMenuEvent::Keyboard && cur.inTexted()) {
 755                         // Do not access the context menu of math right in front of before
 756                         // the cursor. This does not work when the cursor is in text.
 757                         Inset * inset = cur.paragraph().getInset(cur.pos());
 758                         if (inset && inset->asInsetMath())
 759                                 --pos.rx();
 760                         else if (cur.pos() > 0) {
 761                                 Inset * inset = cur.paragraph().getInset(cur.pos() - 1);
 762                                 if (inset)
 763                                         ++pos.rx();
 764                         }
 765                 }
 766                 name = d->buffer_view_->contextMenu(pos.x(), pos.y());
 767         }
 768
 769         if (name.empty()) {
 770                 QAbstractScrollArea::contextMenuEvent(e);
 771                 return;
 772         }
 773         // always show mnemonics when the keyboard is used to show the context menu
 774         // FIXME: This should be fixed in Qt itself
 775         bool const keyboard = (e->reason() == QContextMenuEvent::Keyboard);
 776         QMenu * menu = guiApp->menus().menu(toqstr(name), *d->lyx_view_, keyboard);
 777         if (!menu) {
 778                 QAbstractScrollArea::contextMenuEvent(e);
 779                 return;
 780         }
 781         // Position the menu to the right.
 782         // FIXME: menu position should be different for RTL text.
 783         menu->exec(e->globalPos());
 784         e->accept();
 785 }
 786
 787
 788 void GuiWorkArea::focusInEvent(QFocusEvent * e)
 789 {
 790         LYXERR(Debug::DEBUG, "GuiWorkArea::focusInEvent(): " << this << endl);
 791         if (d->lyx_view_->currentWorkArea() != this) {
 792                 d->lyx_view_->setCurrentWorkArea(this);
 793                 d->lyx_view_->currentWorkArea()->bufferView().buffer().updateBuffer();
 794         }
 795
 796         startBlinkingCursor();
 797         QAbstractScrollArea::focusInEvent(e);
 798 }
 799
 800
 801 void GuiWorkArea::focusOutEvent(QFocusEvent * e)
 802 {
 803         LYXERR(Debug::DEBUG, "GuiWorkArea::focusOutEvent(): " << this << endl);
 804         stopBlinkingCursor();
 805         QAbstractScrollArea::focusOutEvent(e);
 806 }
 807
 808
 809 void GuiWorkArea::mousePressEvent(QMouseEvent * e)
 810 {
 811         if (d->dc_event_.active && d->dc_event_ == *e) {
 812                 d->dc_event_.active = false;
 813                 FuncRequest cmd(LFUN_MOUSE_TRIPLE, e->x(), e->y(),
 814                         q_button_state(e->button()));
 815                 d->dispatch(cmd);
 816                 e->accept();
 817                 return;
 818         }
 819
 820 #if (QT_VERSION < 0x050000)
 821         inputContext()->reset();
 822 #endif
 823
 824         FuncRequest const cmd(LFUN_MOUSE_PRESS, e->x(), e->y(),
 825                 q_button_state(e->button()));
 826         d->dispatch(cmd, q_key_state(e->modifiers()));
 827
 828         // Save the context menu on mouse press, because also the mouse
 829         // cursor is set on mouse press. Afterwards, we can either release
 830         // the mousebutton somewhere else, or the cursor might have moved
 831         // due to the DEPM. We need to do this after the mouse has been
 832         // set in dispatch(), because the selection state might change.
 833         if (e->button() == Qt::RightButton)
 834                 d->context_menu_name_ = d->buffer_view_->contextMenu(e->x(), e->y());
 835
 836         e->accept();
 837 }
 838
 839
 840 void GuiWorkArea::mouseReleaseEvent(QMouseEvent * e)
 841 {
 842         if (d->synthetic_mouse_event_.timeout.running())
 843                 d->synthetic_mouse_event_.timeout.stop();
 844
 845         FuncRequest const cmd(LFUN_MOUSE_RELEASE, e->x(), e->y(),
 846                               q_button_state(e->button()));
 847         d->dispatch(cmd);
 848         e->accept();
 849 }
 850
 851
 852 void GuiWorkArea::mouseMoveEvent(QMouseEvent * e)
 853 {
 854         // we kill the triple click if we move
 855         doubleClickTimeout();
 856         FuncRequest cmd(LFUN_MOUSE_MOTION, e->x(), e->y(),
 857                 q_motion_state(e->buttons()));
 858
 859         e->accept();
 860
 861         // If we're above or below the work area...
 862         if ((e->y() <= 20 || e->y() >= viewport()->height() - 20)
 863                         && e->buttons() == mouse_button::button1) {
 864                 // Make sure only a synthetic event can cause a page scroll,
 865                 // so they come at a steady rate:
 866                 if (e->y() <= 20)
 867                         // _Force_ a scroll up:
 868                         cmd.set_y(e->y() - 21);
 869                 else
 870                         cmd.set_y(e->y() + 21);
 871                 // Store the event, to be handled when the timeout expires.
 872                 d->synthetic_mouse_event_.cmd = cmd;
 873
 874                 if (d->synthetic_mouse_event_.timeout.running()) {
 875                         // Discard the event. Note that it _may_ be handled
 876                         // when the timeout expires if
 877                         // synthetic_mouse_event_.cmd has not been overwritten.
 878                         // Ie, when the timeout expires, we handle the
 879                         // most recent event but discard all others that
 880                         // occurred after the one used to start the timeout
 881                         // in the first place.
 882                         return;
 883                 }
 884
 885                 d->synthetic_mouse_event_.restart_timeout = true;
 886                 d->synthetic_mouse_event_.timeout.start();
 887                 // Fall through to handle this event...
 888
 889         } else if (d->synthetic_mouse_event_.timeout.running()) {
 890                 // Store the event, to be possibly handled when the timeout
 891                 // expires.
 892                 // Once the timeout has expired, normal control is returned
 893                 // to mouseMoveEvent (restart_timeout = false).
 894                 // This results in a much smoother 'feel' when moving the
 895                 // mouse back into the work area.
 896                 d->synthetic_mouse_event_.cmd = cmd;
 897                 d->synthetic_mouse_event_.restart_timeout = false;
 898                 return;
 899         }
 900         d->dispatch(cmd);
 901 }
 902
 903
 904 void GuiWorkArea::wheelEvent(QWheelEvent * ev)
 905 {
 906         // Wheel rotation by one notch results in a delta() of 120 (see
 907         // documentation of QWheelEvent)
 908         double const delta = ev->delta() / 120.0;
 909         bool zoom = false;
 910         switch (lyxrc.scroll_wheel_zoom) {
 911         case LyXRC::SCROLL_WHEEL_ZOOM_CTRL:
 912                 zoom = ev->modifiers() & Qt::ControlModifier;
 913                 zoom &= !(ev->modifiers() & (Qt::ShiftModifier | Qt::AltModifier));
 914                 break;
 915         case LyXRC::SCROLL_WHEEL_ZOOM_SHIFT:
 916                 zoom = ev->modifiers() & Qt::ShiftModifier;
 917                 zoom &= !(ev->modifiers() & (Qt::ControlModifier | Qt::AltModifier));
 918                 break;
 919         case LyXRC::SCROLL_WHEEL_ZOOM_ALT:
 920                 zoom = ev->modifiers() & Qt::AltModifier;
 921                 zoom &= !(ev->modifiers() & (Qt::ShiftModifier | Qt::ControlModifier));
 922                 break;
 923         case LyXRC::SCROLL_WHEEL_ZOOM_OFF:
 924                 break;
 925         }
 926         if (zoom) {
 927                 docstring arg = convert<docstring>(int(5 * delta));
 928                 lyx::dispatch(FuncRequest(LFUN_BUFFER_ZOOM_IN, arg));
 929                 return;
 930         }
 931
 932         // Take into account the desktop wide settings.
 933         int const lines = qApp->wheelScrollLines();
 934         int const page_step = verticalScrollBar()->pageStep();
 935         // Test if the wheel mouse is set to one screen at a time.
 936         int scroll_value = lines > page_step
 937                 ? page_step : lines * verticalScrollBar()->singleStep();
 938
 939         // Take into account the rotation and the user preferences.
 940         scroll_value = int(scroll_value * delta * lyxrc.mouse_wheel_speed);
 941         LYXERR(Debug::SCROLLING, "wheelScrollLines = " << lines
 942                         << " delta = " << delta << " scroll_value = " << scroll_value
 943                         << " page_step = " << page_step);
 944         // Now scroll.
 945         verticalScrollBar()->setValue(verticalScrollBar()->value() - scroll_value);
 946
 947         ev->accept();
 948 }
 949
 950
 951 void GuiWorkArea::generateSyntheticMouseEvent()
 952 {
 953         int const e_y = d->synthetic_mouse_event_.cmd.y();
 954         int const wh = d->buffer_view_->workHeight();
 955         bool const up = e_y < 0;
 956         bool const down = e_y > wh;
 957
 958         // Set things off to generate the _next_ 'pseudo' event.
 959         int step = 50;
 960         if (d->synthetic_mouse_event_.restart_timeout) {
 961                 // This is some magic formulae to determine the speed
 962                 // of scrolling related to the position of the mouse.
 963                 int time = 200;
 964                 if (up || down) {
 965                         int dist = up ? -e_y : e_y - wh;
 966                         time = max(min(200, 250000 / (dist * dist)), 1) ;
 967
 968                         if (time < 40) {
 969                                 step = 80000 / (time * time);
 970                                 time = 40;
 971                         }
 972                 }
 973                 d->synthetic_mouse_event_.timeout.setTimeout(time);
 974                 d->synthetic_mouse_event_.timeout.start();
 975         }
 976
 977         // Can we scroll further ?
 978         int const value = verticalScrollBar()->value();
 979         if (value == verticalScrollBar()->maximum()
 980                   || value == verticalScrollBar()->minimum()) {
 981                 d->synthetic_mouse_event_.timeout.stop();
 982                 return;
 983         }
 984
 985         // Scroll
 986         if (step <= 2 * wh) {
 987                 d->buffer_view_->scroll(up ? -step : step);
 988                 d->buffer_view_->updateMetrics();
 989         } else {
 990                 d->buffer_view_->scrollDocView(value + (up ? -step : step), false);
 991         }
 992
 993         // In which paragraph do we have to set the cursor ?
 994         Cursor & cur = d->buffer_view_->cursor();
 995         // FIXME: we don't know howto handle math.
 996         Text * text = cur.text();
 997         if (!text)
 998                 return;
 999         TextMetrics const & tm = d->buffer_view_->textMetrics(text);
1000
1001         pair<pit_type, const ParagraphMetrics *> pp = up ? tm.first() : tm.last();
1002         ParagraphMetrics const & pm = *pp.second;
1003         pit_type const pit = pp.first;
1004
1005         if (pm.rows().empty())
1006                 return;
1007
1008         // Find the row at which we set the cursor.
1009         RowList::const_iterator rit = pm.rows().begin();
1010         RowList::const_iterator rlast = pm.rows().end();
1011         int yy = pm.position() - pm.ascent();
1012         for (--rlast; rit != rlast; ++rit) {
1013                 int h = rit->height();
1014                 if ((up && yy + h > 0)
1015                           || (!up && yy + h > wh - defaultRowHeight()))
1016                         break;
1017                 yy += h;
1018         }
1019
1020         // Find the position of the cursor
1021         bool bound;
1022         int x = d->synthetic_mouse_event_.cmd.x();
1023         pos_type const pos = tm.getPosNearX(*rit, x, bound);
1024
1025         // Set the cursor
1026         cur.pit() = pit;
1027         cur.pos() = pos;
1028         cur.boundary(bound);
1029
1030         d->buffer_view_->buffer().changed(false);
1031         return;
1032 }
1033
1034
1035 void GuiWorkArea::keyPressEvent(QKeyEvent * ev)
1036 {
1037         // Do not process here some keys if dialog_mode_ is set
1038         if (d->dialog_mode_
1039                 && (ev->modifiers() == Qt::NoModifier
1040                     || ev->modifiers() == Qt::ShiftModifier)
1041                 && (ev->key() == Qt::Key_Escape
1042                     || ev->key() == Qt::Key_Enter
1043                     || ev->key() == Qt::Key_Return)
1044             ) {
1045                 ev->ignore();
1046                 return;
1047         }
1048
1049         // intercept some keys if completion popup is visible
1050         if (d->completer_->popupVisible()) {
1051                 switch (ev->key()) {
1052                 case Qt::Key_Enter:
1053                 case Qt::Key_Return:
1054                         d->completer_->activate();
1055                         ev->accept();
1056                         return;
1057                 }
1058         }
1059
1060         // do nothing if there are other events
1061         // (the auto repeated events come too fast)
1062         // it looks like this is only needed on X11
1063 #ifdef Q_WS_X11
1064         if (qApp->hasPendingEvents() && ev->isAutoRepeat()) {
1065                 switch (ev->key()) {
1066                 case Qt::Key_PageDown:
1067                 case Qt::Key_PageUp:
1068                 case Qt::Key_Left:
1069                 case Qt::Key_Right:
1070                 case Qt::Key_Up:
1071                 case Qt::Key_Down:
1072                         LYXERR(Debug::KEY, "system is busy: scroll key event ignored");
1073                         ev->ignore();
1074                         return;
1075                 }
1076         }
1077 #endif
1078
1079         KeyModifier m = q_key_state(ev->modifiers());
1080
1081         std::string str;
1082         if (m & ShiftModifier)
1083                 str += "Shift-";
1084         if (m & ControlModifier)
1085                 str += "Control-";
1086         if (m & AltModifier)
1087                 str += "Alt-";
1088         if (m & MetaModifier)
1089                 str += "Meta-";
1090
1091         LYXERR(Debug::KEY, " count: " << ev->count() << " text: " << ev->text()
1092                 << " isAutoRepeat: " << ev->isAutoRepeat() << " key: " << ev->key()
1093                 << " keyState: " << str);
1094
1095         KeySymbol sym;
1096         setKeySymbol(&sym, ev);
1097         if (sym.isOK()) {
1098                 processKeySym(sym, q_key_state(ev->modifiers()));
1099                 ev->accept();
1100         } else {
1101                 ev->ignore();
1102         }
1103 }
1104
1105
1106 void GuiWorkArea::doubleClickTimeout()
1107 {
1108         d->dc_event_.active = false;
1109 }
1110
1111
1112 void GuiWorkArea::mouseDoubleClickEvent(QMouseEvent * ev)
1113 {
1114         d->dc_event_ = DoubleClick(ev);
1115         QTimer::singleShot(QApplication::doubleClickInterval(), this,
1116                            SLOT(doubleClickTimeout()));
1117         FuncRequest cmd(LFUN_MOUSE_DOUBLE,
1118                         ev->x(), ev->y(),
1119                         q_button_state(ev->button()));
1120         d->dispatch(cmd);
1121         ev->accept();
1122 }
1123
1124
1125 void GuiWorkArea::resizeEvent(QResizeEvent * ev)
1126 {
1127         QAbstractScrollArea::resizeEvent(ev);
1128         d->need_resize_ = true;
1129         ev->accept();
1130 }
1131
1132
1133 void GuiWorkArea::Private::update(int x, int y, int w, int h)
1134 {
1135         p->viewport()->update(x, y, w, h);
1136 }
1137
1138
1139 void GuiWorkArea::paintEvent(QPaintEvent * ev)
1140 {
1141         QRectF const rc = ev->rect();
1142         // LYXERR(Debug::PAINTING, "paintEvent begin: x: " << rc.x()
1143         //      << " y: " << rc.y() << " w: " << rc.width() << " h: " << rc.height());
1144
1145         if (d->needResize()) {
1146                 d->resetScreen();
1147                 d->resizeBufferView();
1148                 if (d->cursor_visible_) {
1149                         d->hideCursor();
1150                         d->showCursor();
1151                 }
1152         }
1153
1154         QPainter pain(viewport());
1155         double const pr = pixelRatio();
1156         QRectF const rcs = QRectF(rc.x() * pr, rc.y() * pr, rc.width() * pr, rc.height() * pr);
1157
1158         if (lyxrc.use_qimage) {
1159                 QImage const & image = static_cast<QImage const &>(*d->screen_);
1160                 pain.drawImage(rc, image, rcs);
1161         } else {
1162                 QPixmap const & pixmap = static_cast<QPixmap const &>(*d->screen_);
1163                 pain.drawPixmap(rc, pixmap, rcs);
1164         }
1165         d->cursor_->draw(pain);
1166         ev->accept();
1167 }
1168
1169
1170 void GuiWorkArea::Private::updateScreen()
1171 {
1172         GuiPainter pain(screen_, p->pixelRatio());
1173         buffer_view_->draw(pain);
1174 }
1175
1176
1177 void GuiWorkArea::Private::showCursor(int x, int y, int h,
1178         bool l_shape, bool rtl, bool completable)
1179 {
1180         if (schedule_redraw_) {
1181                 // This happens when a graphic conversion is finished. As we don't know
1182                 // the size of the new graphics, it's better the update everything.
1183                 // We can't use redraw() here because this would trigger a infinite
1184                 // recursive loop with showCursor().
1185                 buffer_view_->resize(p->viewport()->width(), p->viewport()->height());
1186                 updateScreen();
1187                 updateScrollbar();
1188                 p->viewport()->update(QRect(0, 0, p->viewport()->width(), p->viewport()->height()));
1189                 schedule_redraw_ = false;
1190                 // Show the cursor immediately after the update.
1191                 hideCursor();
1192                 p->toggleCursor();
1193                 return;
1194         }
1195
1196         cursor_->update(x, y, h, l_shape, rtl, completable);
1197         cursor_->show();
1198         p->viewport()->update(cursor_->rect());
1199 }
1200
1201
1202 void GuiWorkArea::Private::removeCursor()
1203 {
1204         cursor_->hide();
1205         //if (!qApp->focusWidget())
1206                 p->viewport()->update(cursor_->rect());
1207 }
1208
1209
1210 void GuiWorkArea::inputMethodEvent(QInputMethodEvent * e)
1211 {
1212         QString const & commit_string = e->commitString();
1213         docstring const & preedit_string
1214                 = qstring_to_ucs4(e->preeditString());
1215
1216         if (!commit_string.isEmpty()) {
1217
1218                 LYXERR(Debug::KEY, "preeditString: " << e->preeditString()
1219                         << " commitString: " << e->commitString());
1220
1221                 int key = 0;
1222
1223                 // FIXME Iwami 04/01/07: we should take care also of UTF16 surrogates here.
1224                 for (int i = 0; i != commit_string.size(); ++i) {
1225                         QKeyEvent ev(QEvent::KeyPress, key, Qt::NoModifier, commit_string[i]);
1226                         keyPressEvent(&ev);
1227                 }
1228         }
1229
1230         // Hide the cursor during the kana-kanji transformation.
1231         if (preedit_string.empty())
1232                 startBlinkingCursor();
1233         else
1234                 stopBlinkingCursor();
1235
1236         // last_width : for checking if last preedit string was/wasn't empty.
1237         // FIXME THREAD
1238         // We could have more than one work area, right?
1239         static bool last_width = false;
1240         if (!last_width && preedit_string.empty()) {
1241                 // if last_width is last length of preedit string.
1242                 e->accept();
1243                 return;
1244         }
1245
1246         GuiPainter pain(d->screen_, pixelRatio());
1247         d->buffer_view_->updateMetrics();
1248         d->buffer_view_->draw(pain);
1249         FontInfo font = d->buffer_view_->cursor().getFont().fontInfo();
1250         FontMetrics const & fm = theFontMetrics(font);
1251         int height = fm.maxHeight();
1252         int cur_x = d->cursor_->rect().left();
1253         int cur_y = d->cursor_->rect().bottom();
1254
1255         // redraw area of preedit string.
1256         update(0, cur_y - height, viewport()->width(),
1257                 (height + 1) * d->preedit_lines_);
1258
1259         if (preedit_string.empty()) {
1260                 last_width = false;
1261                 d->preedit_lines_ = 1;
1262                 e->accept();
1263                 return;
1264         }
1265         last_width = true;
1266
1267         // att : stores an IM attribute.
1268         QList<QInputMethodEvent::Attribute> const & att = e->attributes();
1269
1270         // get attributes of input method cursor.
1271         // cursor_pos : cursor position in preedit string.
1272         size_t cursor_pos = 0;
1273         bool cursor_is_visible = false;
1274         for (int i = 0; i != att.size(); ++i) {
1275                 if (att.at(i).type == QInputMethodEvent::Cursor) {
1276                         cursor_pos = att.at(i).start;
1277                         cursor_is_visible = att.at(i).length != 0;
1278                         break;
1279                 }
1280         }
1281
1282         size_t preedit_length = preedit_string.length();
1283
1284         // get position of selection in input method.
1285         // FIXME: isn't there a way to do this simplier?
1286         // rStart : cursor position in selected string in IM.
1287         size_t rStart = 0;
1288         // rLength : selected string length in IM.
1289         size_t rLength = 0;
1290         if (cursor_pos < preedit_length) {
1291                 for (int i = 0; i != att.size(); ++i) {
1292                         if (att.at(i).type == QInputMethodEvent::TextFormat) {
1293                                 if (att.at(i).start <= int(cursor_pos)
1294                                         && int(cursor_pos) < att.at(i).start + att.at(i).length) {
1295                                                 rStart = att.at(i).start;
1296                                                 rLength = att.at(i).length;
1297                                                 if (!cursor_is_visible)
1298                                                         cursor_pos += rLength;
1299                                                 break;
1300                                 }
1301                         }
1302                 }
1303         }
1304         else {
1305                 rStart = cursor_pos;
1306                 rLength = 0;
1307         }
1308
1309         int const right_margin = d->buffer_view_->rightMargin();
1310         Painter::preedit_style ps;
1311         // Most often there would be only one line:
1312         d->preedit_lines_ = 1;
1313         for (size_t pos = 0; pos != preedit_length; ++pos) {
1314                 char_type const typed_char = preedit_string[pos];
1315                 // reset preedit string style
1316                 ps = Painter::preedit_default;
1317
1318                 // if we reached the right extremity of the screen, go to next line.
1319                 if (cur_x + fm.width(typed_char) > viewport()->width() - right_margin) {
1320                         cur_x = right_margin;
1321                         cur_y += height + 1;
1322                         ++d->preedit_lines_;
1323                 }
1324                 // preedit strings are displayed with dashed underline
1325                 // and partial strings are displayed white on black indicating
1326                 // that we are in selecting mode in the input method.
1327                 // FIXME: rLength == preedit_length is not a changing condition
1328                 // FIXME: should be put out of the loop.
1329                 if (pos >= rStart
1330                         && pos < rStart + rLength
1331                         && !(cursor_pos < rLength && rLength == preedit_length))
1332                         ps = Painter::preedit_selecting;
1333
1334                 if (pos == cursor_pos
1335                         && (cursor_pos < rLength && rLength == preedit_length))
1336                         ps = Painter::preedit_cursor;
1337
1338                 // draw one character and update cur_x.
1339                 cur_x += pain.preeditText(cur_x, cur_y, typed_char, font, ps);
1340         }
1341
1342         // update the preedit string screen area.
1343         update(0, cur_y - d->preedit_lines_*height, viewport()->width(),
1344                 (height + 1) * d->preedit_lines_);
1345
1346         // Don't forget to accept the event!
1347         e->accept();
1348 }
1349
1350
1351 QVariant GuiWorkArea::inputMethodQuery(Qt::InputMethodQuery query) const
1352 {
1353         QRect cur_r(0, 0, 0, 0);
1354         switch (query) {
1355                 // this is the CJK-specific composition window position and
1356                 // the context menu position when the menu key is pressed.
1357                 case Qt::ImMicroFocus:
1358                         cur_r = d->cursor_->rect();
1359                         if (d->preedit_lines_ != 1)
1360                                 cur_r.moveLeft(10);
1361                         cur_r.moveBottom(cur_r.bottom()
1362                                 + cur_r.height() * (d->preedit_lines_ - 1));
1363                         // return lower right of cursor in LyX.
1364                         return cur_r;
1365                 default:
1366                         return QWidget::inputMethodQuery(query);
1367         }
1368 }
1369
1370
1371 void GuiWorkArea::updateWindowTitle()
1372 {
1373         docstring maximize_title;
1374         docstring minimize_title;
1375
1376         Buffer const & buf = d->buffer_view_->buffer();
1377         FileName const file_name = buf.fileName();
1378         if (!file_name.empty()) {
1379                 maximize_title = file_name.displayName(130);
1380                 minimize_title = from_utf8(file_name.onlyFileName());
1381                 if (buf.lyxvc().inUse()) {
1382                         if (buf.lyxvc().locking())
1383                                 maximize_title +=  _(" (version control, locking)");
1384                         else
1385                                 maximize_title +=  _(" (version control)");
1386                 }
1387                 if (!buf.isClean()) {
1388                         maximize_title += _(" (changed)");
1389                         minimize_title += char_type('*');
1390                 }
1391                 if (buf.isReadonly())
1392                         maximize_title += _(" (read only)");
1393         }
1394
1395         QString const new_title = toqstr(maximize_title);
1396         if (new_title != windowTitle()) {
1397                 QWidget::setWindowTitle(new_title);
1398                 QWidget::setWindowIconText(toqstr(minimize_title));
1399                 titleChanged(this);
1400         }
1401 }
1402
1403
1404 bool GuiWorkArea::isFullScreen() const
1405 {
1406         return d->lyx_view_ && d->lyx_view_->isFullScreen();
1407 }
1408
1409
1410 void GuiWorkArea::scheduleRedraw()
1411 {
1412         d->schedule_redraw_ = true;
1413 }
1414
1415
1416 bool GuiWorkArea::inDialogMode() const
1417 {
1418         return d->dialog_mode_;
1419 }
1420
1421
1422 void GuiWorkArea::setDialogMode(bool mode)
1423 {
1424         d->dialog_mode_ = mode;
1425 }
1426
1427
1428 GuiCompleter & GuiWorkArea::completer()
1429 {
1430         return *d->completer_;
1431 }
1432
1433 GuiView const & GuiWorkArea::view() const
1434 {
1435         return *d->lyx_view_;
1436 }
1437
1438
1439 GuiView & GuiWorkArea::view()
1440 {
1441         return *d->lyx_view_;
1442 }
1443
1444 ////////////////////////////////////////////////////////////////////
1445 //
1446 // EmbeddedWorkArea
1447 //
1448 ////////////////////////////////////////////////////////////////////
1449
1450
1451 EmbeddedWorkArea::EmbeddedWorkArea(QWidget * w): GuiWorkArea(w)
1452 {
1453         support::TempFile tempfile("embedded.internal");
1454         tempfile.setAutoRemove(false);
1455         buffer_ = theBufferList().newInternalBuffer(tempfile.name().absFileName());
1456         buffer_->setUnnamed(true);
1457         buffer_->setFullyLoaded(true);
1458         setBuffer(*buffer_);
1459         setDialogMode(true);
1460 }
1461
1462
1463 EmbeddedWorkArea::~EmbeddedWorkArea()
1464 {
1465         // No need to destroy buffer and bufferview here, because it is done
1466         // in theBufferList() destruction loop at application exit
1467 }
1468
1469
1470 void EmbeddedWorkArea::closeEvent(QCloseEvent * ev)
1471 {
1472         disable();
1473         GuiWorkArea::closeEvent(ev);
1474 }
1475
1476
1477 void EmbeddedWorkArea::hideEvent(QHideEvent * ev)
1478 {
1479         disable();
1480         GuiWorkArea::hideEvent(ev);
1481 }
1482
1483
1484 QSize EmbeddedWorkArea::sizeHint () const
1485 {
1486         // FIXME(?):
1487         // GuiWorkArea sets the size to the screen's viewport
1488         // by returning a value this gets overridden
1489         // EmbeddedWorkArea is now sized to fit in the layout
1490         // of the parent, and has a minimum size set in GuiWorkArea
1491         // which is what we return here
1492         return QSize(100, 70);
1493 }
1494
1495
1496 void EmbeddedWorkArea::disable()
1497 {
1498         stopBlinkingCursor();
1499         if (view().currentWorkArea() != this)
1500                 return;
1501         // No problem if currentMainWorkArea() is 0 (setCurrentWorkArea()
1502         // tolerates it and shows the background logo), what happens if
1503         // an EmbeddedWorkArea is closed after closing all document WAs
1504         view().setCurrentWorkArea(view().currentMainWorkArea());
1505 }
1506
1507 ////////////////////////////////////////////////////////////////////
1508 //
1509 // TabWorkArea
1510 //
1511 ////////////////////////////////////////////////////////////////////
1512
1513 #ifdef Q_OS_MAC
1514 class NoTabFrameMacStyle : public QProxyStyle {
1515 public:
1516         ///
1517         QRect subElementRect(SubElement element, const QStyleOption * option,
1518                              const QWidget * widget = 0) const
1519         {
1520                 QRect rect = QProxyStyle::subElementRect(element, option, widget);
1521                 bool noBar = static_cast<QTabWidget const *>(widget)->count() <= 1;
1522
1523                 // The Qt Mac style puts the contents into a 3 pixel wide box
1524                 // which looks very ugly and not like other Mac applications.
1525                 // Hence we remove this here, and moreover the 16 pixel round
1526                 // frame above if the tab bar is hidden.
1527                 if (element == QStyle::SE_TabWidgetTabContents) {
1528                         rect.adjust(- rect.left(), 0, rect.left(), 0);
1529                         if (noBar)
1530                                 rect.setTop(0);
1531                 }
1532
1533                 return rect;
1534         }
1535 };
1536
1537 NoTabFrameMacStyle noTabFrameMacStyle;
1538 #endif
1539
1540
1541 TabWorkArea::TabWorkArea(QWidget * parent)
1542         : QTabWidget(parent), clicked_tab_(-1)
1543 {
1544 #ifdef Q_OS_MAC
1545         setStyle(&noTabFrameMacStyle);
1546 #endif
1547
1548         QPalette pal = palette();
1549         pal.setColor(QPalette::Active, QPalette::Button,
1550                 pal.color(QPalette::Active, QPalette::Window));
1551         pal.setColor(QPalette::Disabled, QPalette::Button,
1552                 pal.color(QPalette::Disabled, QPalette::Window));
1553         pal.setColor(QPalette::Inactive, QPalette::Button,
1554                 pal.color(QPalette::Inactive, QPalette::Window));
1555
1556         QObject::connect(this, SIGNAL(currentChanged(int)),
1557                 this, SLOT(on_currentTabChanged(int)));
1558
1559         closeBufferButton = new QToolButton(this);
1560         closeBufferButton->setPalette(pal);
1561         // FIXME: rename the icon to closebuffer.png
1562         closeBufferButton->setIcon(QIcon(getPixmap("images/", "closetab", "png")));
1563         closeBufferButton->setText("Close File");
1564         closeBufferButton->setAutoRaise(true);
1565         closeBufferButton->setCursor(Qt::ArrowCursor);
1566         closeBufferButton->setToolTip(qt_("Close File"));
1567         closeBufferButton->setEnabled(true);
1568         QObject::connect(closeBufferButton, SIGNAL(clicked()),
1569                 this, SLOT(closeCurrentBuffer()));
1570         setCornerWidget(closeBufferButton, Qt::TopRightCorner);
1571
1572         // setup drag'n'drop
1573         QTabBar* tb = new DragTabBar;
1574         connect(tb, SIGNAL(tabMoveRequested(int, int)),
1575                 this, SLOT(moveTab(int, int)));
1576         tb->setElideMode(Qt::ElideNone);
1577         setTabBar(tb);
1578
1579         // make us responsible for the context menu of the tabbar
1580         tb->setContextMenuPolicy(Qt::CustomContextMenu);
1581         connect(tb, SIGNAL(customContextMenuRequested(const QPoint &)),
1582                 this, SLOT(showContextMenu(const QPoint &)));
1583         connect(tb, SIGNAL(tabCloseRequested(int)),
1584                 this, SLOT(closeTab(int)));
1585
1586         setUsesScrollButtons(true);
1587 }
1588
1589
1590 void TabWorkArea::paintEvent(QPaintEvent * event)
1591 {
1592         if (tabBar()->isVisible()) {
1593                 QTabWidget::paintEvent(event);
1594         } else {
1595                 // Prevent the selected tab to influence the
1596                 // painting of the frame of the tab widget.
1597                 // This is needed for gtk style in Qt.
1598                 QStylePainter p(this);
1599 #if QT_VERSION < 0x050000
1600                 QStyleOptionTabWidgetFrameV2 opt;
1601 #else
1602                 QStyleOptionTabWidgetFrame opt;
1603 #endif
1604                 initStyleOption(&opt);
1605                 opt.rect = style()->subElementRect(QStyle::SE_TabWidgetTabPane,
1606                         &opt, this);
1607                 opt.selectedTabRect = QRect();
1608                 p.drawPrimitive(QStyle::PE_FrameTabWidget, opt);
1609         }
1610 }
1611
1612
1613 void TabWorkArea::mouseDoubleClickEvent(QMouseEvent * event)
1614 {
1615         if (event->button() != Qt::LeftButton)
1616                 return;
1617
1618         // return early if double click on existing tabs
1619         for (int i = 0; i < count(); ++i)
1620                 if (tabBar()->tabRect(i).contains(event->pos()))
1621                         return;
1622
1623         dispatch(FuncRequest(LFUN_BUFFER_NEW));
1624 }
1625
1626
1627 void TabWorkArea::setFullScreen(bool full_screen)
1628 {
1629         for (int i = 0; i != count(); ++i) {
1630                 if (GuiWorkArea * wa = workArea(i))
1631                         wa->setFullScreen(full_screen);
1632         }
1633
1634         if (lyxrc.full_screen_tabbar)
1635                 showBar(!full_screen && count() > 1);
1636         else
1637                 showBar(count() > 1);
1638 }
1639
1640
1641 void TabWorkArea::showBar(bool show)
1642 {
1643         tabBar()->setEnabled(show);
1644         tabBar()->setVisible(show);
1645         closeBufferButton->setVisible(show && lyxrc.single_close_tab_button);
1646         setTabsClosable(!lyxrc.single_close_tab_button);
1647 }
1648
1649
1650 GuiWorkArea * TabWorkArea::currentWorkArea()
1651 {
1652         if (count() == 0)
1653                 return 0;
1654
1655         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(currentWidget());
1656         LATTEST(wa);
1657         return wa;
1658 }
1659
1660
1661 GuiWorkArea * TabWorkArea::workArea(int index)
1662 {
1663         return dynamic_cast<GuiWorkArea *>(widget(index));
1664 }
1665
1666
1667 GuiWorkArea * TabWorkArea::workArea(Buffer & buffer)
1668 {
1669         // FIXME: this method doesn't work if we have more than work area
1670         // showing the same buffer.
1671         for (int i = 0; i != count(); ++i) {
1672                 GuiWorkArea * wa = workArea(i);
1673                 LASSERT(wa, return 0);
1674                 if (&wa->bufferView().buffer() == &buffer)
1675                         return wa;
1676         }
1677         return 0;
1678 }
1679
1680
1681 void TabWorkArea::closeAll()
1682 {
1683         while (count()) {
1684                 GuiWorkArea * wa = workArea(0);
1685                 LASSERT(wa, return);
1686                 removeTab(0);
1687                 delete wa;
1688         }
1689 }
1690
1691
1692 bool TabWorkArea::setCurrentWorkArea(GuiWorkArea * work_area)
1693 {
1694         LASSERT(work_area, return false);
1695         int index = indexOf(work_area);
1696         if (index == -1)
1697                 return false;
1698
1699         if (index == currentIndex())
1700                 // Make sure the work area is up to date.
1701                 on_currentTabChanged(index);
1702         else
1703                 // Switch to the work area.
1704                 setCurrentIndex(index);
1705         work_area->setFocus();
1706
1707         return true;
1708 }
1709
1710
1711 GuiWorkArea * TabWorkArea::addWorkArea(Buffer & buffer, GuiView & view)
1712 {
1713         GuiWorkArea * wa = new GuiWorkArea(buffer, view);
1714         wa->setUpdatesEnabled(false);
1715         // Hide tabbar if there's no tab (avoid a resize and a flashing tabbar
1716         // when hiding it again below).
1717         if (!(currentWorkArea() && currentWorkArea()->isFullScreen()))
1718                 showBar(count() > 0);
1719         addTab(wa, wa->windowTitle());
1720         QObject::connect(wa, SIGNAL(titleChanged(GuiWorkArea *)),
1721                 this, SLOT(updateTabTexts()));
1722         if (currentWorkArea() && currentWorkArea()->isFullScreen())
1723                 setFullScreen(true);
1724         else
1725                 // Hide tabbar if there's only one tab.
1726                 showBar(count() > 1);
1727
1728         updateTabTexts();
1729
1730         return wa;
1731 }
1732
1733
1734 bool TabWorkArea::removeWorkArea(GuiWorkArea * work_area)
1735 {
1736         LASSERT(work_area, return false);
1737         int index = indexOf(work_area);
1738         if (index == -1)
1739                 return false;
1740
1741         work_area->setUpdatesEnabled(false);
1742         removeTab(index);
1743         delete work_area;
1744
1745         if (count()) {
1746                 // make sure the next work area is enabled.
1747                 currentWidget()->setUpdatesEnabled(true);
1748                 if (currentWorkArea() && currentWorkArea()->isFullScreen())
1749                         setFullScreen(true);
1750                 else
1751                         // Show tabbar only if there's more than one tab.
1752                         showBar(count() > 1);
1753         } else
1754                 lastWorkAreaRemoved();
1755
1756         updateTabTexts();
1757
1758         return true;
1759 }
1760
1761
1762 void TabWorkArea::on_currentTabChanged(int i)
1763 {
1764         // returns e.g. on application destruction
1765         if (i == -1)
1766                 return;
1767         GuiWorkArea * wa = workArea(i);
1768         LASSERT(wa, return);
1769         wa->setUpdatesEnabled(true);
1770         wa->redraw(true);
1771         wa->setFocus();
1772         ///
1773         currentWorkAreaChanged(wa);
1774
1775         LYXERR(Debug::GUI, "currentTabChanged " << i
1776                 << " File: " << wa->bufferView().buffer().absFileName());
1777 }
1778
1779
1780 void TabWorkArea::closeCurrentBuffer()
1781 {
1782         GuiWorkArea * wa;
1783         if (clicked_tab_ == -1)
1784                 wa = currentWorkArea();
1785         else {
1786                 wa = workArea(clicked_tab_);
1787                 LASSERT(wa, return);
1788         }
1789         wa->view().closeWorkArea(wa);
1790 }
1791
1792
1793 void TabWorkArea::hideCurrentTab()
1794 {
1795         GuiWorkArea * wa;
1796         if (clicked_tab_ == -1)
1797                 wa = currentWorkArea();
1798         else {
1799                 wa = workArea(clicked_tab_);
1800                 LASSERT(wa, return);
1801         }
1802         wa->view().hideWorkArea(wa);
1803 }
1804
1805
1806 void TabWorkArea::closeTab(int index)
1807 {
1808         on_currentTabChanged(index);
1809         GuiWorkArea * wa;
1810         if (index == -1)
1811                 wa = currentWorkArea();
1812         else {
1813                 wa = workArea(index);
1814                 LASSERT(wa, return);
1815         }
1816         wa->view().closeWorkArea(wa);
1817 }
1818
1819
1820 ///
1821 class DisplayPath {
1822 public:
1823         /// make vector happy
1824         DisplayPath() {}
1825         ///
1826         DisplayPath(int tab, FileName const & filename)
1827                 : tab_(tab)
1828         {
1829                 filename_ = (filename.extension() == "lyx") ?
1830                         toqstr(filename.onlyFileNameWithoutExt())
1831                         : toqstr(filename.onlyFileName());
1832                 postfix_ = toqstr(filename.absoluteFilePath()).
1833                         split("/", QString::SkipEmptyParts);
1834                 postfix_.pop_back();
1835                 abs_ = toqstr(filename.absoluteFilePath());
1836                 dottedPrefix_ = false;
1837         }
1838
1839         /// Absolute path for debugging.
1840         QString abs() const
1841         {
1842                 return abs_;
1843         }
1844         /// Add the first segment from the postfix or three dots to the prefix.
1845         /// Merge multiple dot tripples. In fact dots are added lazily, i.e. only
1846         /// when really needed.
1847         void shiftPathSegment(bool dotted)
1848         {
1849                 if (postfix_.count() <= 0)
1850                         return;
1851
1852                 if (!dotted) {
1853                         if (dottedPrefix_ && !prefix_.isEmpty())
1854                                 prefix_ += ".../";
1855                         prefix_ += postfix_.front() + "/";
1856                 }
1857                 dottedPrefix_ = dotted && !prefix_.isEmpty();
1858                 postfix_.pop_front();
1859         }
1860         ///
1861         QString displayString() const
1862         {
1863                 if (prefix_.isEmpty())
1864                         return filename_;
1865
1866                 bool dots = dottedPrefix_ || !postfix_.isEmpty();
1867                 return prefix_ + (dots ? ".../" : "") + filename_;
1868         }
1869         ///
1870         QString forecastPathString() const
1871         {
1872                 if (postfix_.count() == 0)
1873                         return displayString();
1874
1875                 return prefix_
1876                         + (dottedPrefix_ ? ".../" : "")
1877                         + postfix_.front() + "/";
1878         }
1879         ///
1880         bool final() const { return postfix_.empty(); }
1881         ///
1882         int tab() const { return tab_; }
1883
1884 private:
1885         ///
1886         QString prefix_;
1887         ///
1888         QStringList postfix_;
1889         ///
1890         QString filename_;
1891         ///
1892         QString abs_;
1893         ///
1894         int tab_;
1895         ///
1896         bool dottedPrefix_;
1897 };
1898
1899
1900 ///
1901 bool operator<(DisplayPath const & a, DisplayPath const & b)
1902 {
1903         return a.displayString() < b.displayString();
1904 }
1905
1906 ///
1907 bool operator==(DisplayPath const & a, DisplayPath const & b)
1908 {
1909         return a.displayString() == b.displayString();
1910 }
1911
1912
1913 void TabWorkArea::updateTabTexts()
1914 {
1915         size_t n = count();
1916         if (n == 0)
1917                 return;
1918         std::list<DisplayPath> paths;
1919         typedef std::list<DisplayPath>::iterator It;
1920
1921         // collect full names first: path into postfix, empty prefix and
1922         // filename without extension
1923         for (size_t i = 0; i < n; ++i) {
1924                 GuiWorkArea * i_wa = workArea(i);
1925                 FileName const fn = i_wa->bufferView().buffer().fileName();
1926                 paths.push_back(DisplayPath(i, fn));
1927         }
1928
1929         // go through path segments and see if it helps to make the path more unique
1930         bool somethingChanged = true;
1931         bool allFinal = false;
1932         while (somethingChanged && !allFinal) {
1933                 // adding path segments changes order
1934                 paths.sort();
1935
1936                 LYXERR(Debug::GUI, "updateTabTexts() iteration start");
1937                 somethingChanged = false;
1938                 allFinal = true;
1939
1940                 // find segments which are not unique (i.e. non-atomic)
1941                 It it = paths.begin();
1942                 It segStart = it;
1943                 QString segString = it->displayString();
1944                 for (; it != paths.end(); ++it) {
1945                         // look to the next item
1946                         It next = it;
1947                         ++next;
1948
1949                         // final?
1950                         allFinal = allFinal && it->final();
1951
1952                         LYXERR(Debug::GUI, "it = " << it->abs()
1953                                << " => " << it->displayString());
1954
1955                         // still the same segment?
1956                         QString nextString;
1957                         if ((next != paths.end()
1958                              && (nextString = next->displayString()) == segString))
1959                                 continue;
1960                         LYXERR(Debug::GUI, "segment ended");
1961
1962                         // only a trivial one with one element?
1963                         if (it == segStart) {
1964                                 // start new segment
1965                                 segStart = next;
1966                                 segString = nextString;
1967                                 continue;
1968                         }
1969
1970                         // we found a non-atomic segment segStart <= sit <= it < next.
1971                         // Shift path segments and hope for the best
1972                         // that it makes the path more unique.
1973                         somethingChanged = true;
1974                         It sit = segStart;
1975                         QString dspString = sit->forecastPathString();
1976                         LYXERR(Debug::GUI, "first forecast found for "
1977                                << sit->abs() << " => " << dspString);
1978                         ++sit;
1979                         bool moreUnique = false;
1980                         for (; sit != next; ++sit) {
1981                                 if (sit->forecastPathString() != dspString) {
1982                                         LYXERR(Debug::GUI, "different forecast found for "
1983                                                 << sit->abs() << " => " << sit->forecastPathString());
1984                                         moreUnique = true;
1985                                         break;
1986                                 }
1987                                 LYXERR(Debug::GUI, "same forecast found for "
1988                                         << sit->abs() << " => " << dspString);
1989                         }
1990
1991                         // if the path segment helped, add it. Otherwise add dots
1992                         bool dots = !moreUnique;
1993                         LYXERR(Debug::GUI, "using dots = " << dots);
1994                         for (sit = segStart; sit != next; ++sit) {
1995                                 sit->shiftPathSegment(dots);
1996                                 LYXERR(Debug::GUI, "shifting "
1997                                         << sit->abs() << " => " << sit->displayString());
1998                         }
1999
2000                         // start new segment
2001                         segStart = next;
2002                         segString = nextString;
2003                 }
2004         }
2005
2006         // set new tab titles
2007         for (It it = paths.begin(); it != paths.end(); ++it) {
2008                 int const tab_index = it->tab();
2009                 Buffer const & buf = workArea(tab_index)->bufferView().buffer();
2010                 QString tab_text = it->displayString().replace("&", "&&");
2011                 if (!buf.fileName().empty() && !buf.isClean())
2012                         tab_text += "*";
2013                 setTabText(tab_index, tab_text);
2014                 setTabToolTip(tab_index, it->abs());
2015         }
2016 }
2017
2018
2019 void TabWorkArea::showContextMenu(const QPoint & pos)
2020 {
2021         // which tab?
2022         clicked_tab_ = static_cast<DragTabBar *>(tabBar())->tabAt(pos);
2023         if (clicked_tab_ == -1)
2024                 return;
2025
2026         // show tab popup
2027         QMenu popup;
2028         popup.addAction(QIcon(getPixmap("images/", "hidetab", "png")),
2029                 qt_("Hide tab"), this, SLOT(hideCurrentTab()));
2030         popup.addAction(QIcon(getPixmap("images/", "closetab", "png")),
2031                 qt_("Close tab"), this, SLOT(closeCurrentBuffer()));
2032         popup.exec(tabBar()->mapToGlobal(pos));
2033
2034         clicked_tab_ = -1;
2035 }
2036
2037
2038 void TabWorkArea::moveTab(int fromIndex, int toIndex)
2039 {
2040         QWidget * w = widget(fromIndex);
2041         QIcon icon = tabIcon(fromIndex);
2042         QString text = tabText(fromIndex);
2043
2044         setCurrentIndex(fromIndex);
2045         removeTab(fromIndex);
2046         insertTab(toIndex, w, icon, text);
2047         setCurrentIndex(toIndex);
2048 }
2049
2050
2051 DragTabBar::DragTabBar(QWidget* parent)
2052         : QTabBar(parent)
2053 {
2054         setAcceptDrops(true);
2055         setTabsClosable(!lyxrc.single_close_tab_button);
2056 }
2057
2058
2059 void DragTabBar::mousePressEvent(QMouseEvent * event)
2060 {
2061         if (event->button() == Qt::LeftButton)
2062                 dragStartPos_ = event->pos();
2063         QTabBar::mousePressEvent(event);
2064 }
2065
2066
2067 void DragTabBar::mouseMoveEvent(QMouseEvent * event)
2068 {
2069         // If the left button isn't pressed anymore then return
2070         if (!(event->buttons() & Qt::LeftButton))
2071                 return;
2072
2073         // If the distance is too small then return
2074         if ((event->pos() - dragStartPos_).manhattanLength()
2075             < QApplication::startDragDistance())
2076                 return;
2077
2078         // did we hit something after all?
2079         int tab = tabAt(dragStartPos_);
2080         if (tab == -1)
2081                 return;
2082
2083         // simulate button release to remove highlight from button
2084         int i = currentIndex();
2085         QMouseEvent me(QEvent::MouseButtonRelease, dragStartPos_,
2086                 event->button(), event->buttons(), 0);
2087         QTabBar::mouseReleaseEvent(&me);
2088         setCurrentIndex(i);
2089
2090         // initiate Drag
2091         QDrag * drag = new QDrag(this);
2092         QMimeData * mimeData = new QMimeData;
2093         // a crude way to distinguish tab-reodering drops from other ones
2094         mimeData->setData("action", "tab-reordering") ;
2095         drag->setMimeData(mimeData);
2096
2097         // get tab pixmap as cursor
2098         QRect r = tabRect(tab);
2099         QPixmap pixmap(r.size());
2100         render(&pixmap, - r.topLeft());
2101         drag->setPixmap(pixmap);
2102         drag->exec();
2103 }
2104
2105
2106 void DragTabBar::dragEnterEvent(QDragEnterEvent * event)
2107 {
2108         // Only accept if it's an tab-reordering request
2109         QMimeData const * m = event->mimeData();
2110         QStringList formats = m->formats();
2111         if (formats.contains("action")
2112             && m->data("action") == "tab-reordering")
2113                 event->acceptProposedAction();
2114 }
2115
2116
2117 void DragTabBar::dropEvent(QDropEvent * event)
2118 {
2119         int fromIndex = tabAt(dragStartPos_);
2120         int toIndex = tabAt(event->pos());
2121
2122         // Tell interested objects that
2123         if (fromIndex != toIndex)
2124                 tabMoveRequested(fromIndex, toIndex);
2125         event->acceptProposedAction();
2126 }
2127
2128
2129 } // namespace frontend
2130 } // namespace lyx
2131
2132 #include "moc_GuiWorkArea.cpp"