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