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() : rtl_(false), l_shape_(false), completable_(false),
 136                 show_(false), x_(0), cursor_width_(0)
 137         {
 138                 recomputeWidth();
 139         }
 140
 141         void draw(QPainter & painter)
 142         {
 143                 if (!show_ || !rect_.isValid())
 144                         return;
 145
 146                 int y = rect_.top();
 147                 int l = x_ - rect_.left();
 148                 int r = rect_.right() - x_;
 149                 int bot = rect_.bottom();
 150
 151                 // draw vertical line
 152                 painter.fillRect(x_, y, cursor_width_, rect_.height(), color_);
 153
 154                 // draw RTL/LTR indication
 155                 painter.setPen(color_);
 156                 if (l_shape_) {
 157                         if (rtl_)
 158                                 painter.drawLine(x_, bot, x_ - l, bot);
 159                         else
 160                                 painter.drawLine(x_, bot, x_ + cursor_width_ + r, bot);
 161                 }
 162
 163                 // draw completion triangle
 164                 if (completable_) {
 165                         int m = y + rect_.height() / 2;
 166                         int d = TabIndicatorWidth - 1;
 167                         if (rtl_) {
 168                                 painter.drawLine(x_ - 1, m - d, x_ - 1 - d, m);
 169                                 painter.drawLine(x_ - 1, m + d, x_ - 1 - d, m);
 170                         } else {
 171                                 painter.drawLine(x_ + cursor_width_, m - d, x_ + cursor_width_ + d, m);
 172                                 painter.drawLine(x_ + cursor_width_, m + d, x_ + cursor_width_ + d, m);
 173                         }
 174                 }
 175         }
 176
 177         void update(int x, int y, int h, bool l_shape,
 178                 bool rtl, bool completable)
 179         {
 180                 color_ = guiApp->colorCache().get(Color_cursor);
 181                 l_shape_ = l_shape;
 182                 rtl_ = rtl;
 183                 completable_ = completable;
 184                 x_ = x;
 185
 186                 // extension to left and right
 187                 int l = 0;
 188                 int r = 0;
 189
 190                 // RTL/LTR indication
 191                 if (l_shape_) {
 192                         if (rtl)
 193                                 l += h / 3;
 194                         else
 195                                 r += h / 3;
 196                 }
 197
 198                 // completion triangle
 199                 if (completable_) {
 200                         if (rtl)
 201                                 l = max(l, TabIndicatorWidth);
 202                         else
 203                                 r = max(r, TabIndicatorWidth);
 204                 }
 205
 206                 // compute overall rectangle
 207                 rect_ = QRect(x - l, y, cursor_width_ + r + l, h);
 208         }
 209
 210         void show(bool set_show = true) { show_ = set_show; }
 211         void hide() { show_ = false; }
 212         int cursorWidth() const { return cursor_width_; }
 213         void recomputeWidth() {
 214                 cursor_width_ = lyxrc.cursor_width
 215                         ? lyxrc.cursor_width
 216                         : 1 + int((lyxrc.zoom + 50) / 200.0);
 217         }
 218
 219         QRect const & rect() { return rect_; }
 220
 221 private:
 222         /// cursor is in RTL or LTR text
 223         bool rtl_;
 224         /// indication for RTL or LTR
 225         bool l_shape_;
 226         /// triangle to show that a completion is available
 227         bool completable_;
 228         ///
 229         bool show_;
 230         ///
 231         QColor color_;
 232         /// rectangle, possibly with l_shape and completion triangle
 233         QRect rect_;
 234         /// x position (were the vertical line is drawn)
 235         int x_;
 236
 237         int cursor_width_;
 238 };
 239
 240
 241 // This is a 'heartbeat' generating synthetic mouse move events when the
 242 // cursor is at the top or bottom edge of the viewport. One scroll per 0.2 s
 243 SyntheticMouseEvent::SyntheticMouseEvent()
 244         : timeout(200), restart_timeout(true)
 245 {}
 246
 247
 248 GuiWorkArea::Private::Private(GuiWorkArea * parent)
 249 : p(parent), screen_(0), buffer_view_(0), read_only_(false), lyx_view_(0),
 250 cursor_visible_(false), cursor_(0),
 251 need_resize_(false), schedule_redraw_(false), preedit_lines_(1),
 252 pixel_ratio_(1.0),
 253 completer_(new GuiCompleter(p, p)), dialog_mode_(false)
 254 {
 255 }
 256
 257
 258 GuiWorkArea::GuiWorkArea(QWidget * /* w */)
 259 : d(new Private(this))
 260 {
 261 }
 262
 263
 264 GuiWorkArea::GuiWorkArea(Buffer & buffer, GuiView & gv)
 265 : d(new Private(this))
 266 {
 267         setGuiView(gv);
 268         buffer.params().display_pixel_ratio = theGuiApp()->pixelRatio();
 269         setBuffer(buffer);
 270         init();
 271 }
 272
 273
 274 double GuiWorkArea::pixelRatio() const
 275 {
 276 #if QT_VERSION >= 0x050000
 277         return devicePixelRatio();
 278 #else
 279         return 1.0;
 280 #endif
 281 }
 282
 283
 284 void GuiWorkArea::init()
 285 {
 286         // Setup the signals
 287         connect(&d->cursor_timeout_, SIGNAL(timeout()),
 288                 this, SLOT(toggleCursor()));
 289
 290         int const time = QApplication::cursorFlashTime() / 2;
 291         if (time > 0) {
 292                 d->cursor_timeout_.setInterval(time);
 293                 d->cursor_timeout_.start();
 294         } else {
 295                 // let's initialize this just to be safe
 296                 d->cursor_timeout_.setInterval(500);
 297         }
 298
 299         d->resetScreen();
 300         // With Qt4.5 a mouse event will happen before the first paint event
 301         // so make sure that the buffer view has an up to date metrics.
 302         d->buffer_view_->resize(viewport()->width(), viewport()->height());
 303         d->cursor_ = new frontend::CursorWidget();
 304         d->cursor_->hide();
 305
 306         setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 307         setAcceptDrops(true);
 308         setMouseTracking(true);
 309         setMinimumSize(100, 70);
 310         setFrameStyle(QFrame::NoFrame);
 311         updateWindowTitle();
 312
 313         viewport()->setAutoFillBackground(false);
 314         // We don't need double-buffering nor SystemBackground on
 315         // the viewport because we have our own backing pixmap.
 316         viewport()->setAttribute(Qt::WA_NoSystemBackground);
 317
 318         setFocusPolicy(Qt::StrongFocus);
 319
 320         d->setCursorShape(Qt::IBeamCursor);
 321
 322         d->synthetic_mouse_event_.timeout.timeout.connect(
 323                 bind(&GuiWorkArea::generateSyntheticMouseEvent,
 324                                         this));
 325
 326         // Initialize the vertical Scroll Bar
 327         QObject::connect(verticalScrollBar(), SIGNAL(valueChanged(int)),
 328                 this, SLOT(scrollTo(int)));
 329
 330         LYXERR(Debug::GUI, "viewport width: " << viewport()->width()
 331                 << "  viewport height: " << viewport()->height());
 332
 333         // Enables input methods for asian languages.
 334         // Must be set when creating custom text editing widgets.
 335         setAttribute(Qt::WA_InputMethodEnabled, true);
 336
 337         d->dialog_mode_ = false;
 338 }
 339
 340
 341 GuiWorkArea::~GuiWorkArea()
 342 {
 343         d->buffer_view_->buffer().workAreaManager().remove(this);
 344         delete d->screen_;
 345         delete d->buffer_view_;
 346         delete d->cursor_;
 347         // Completer has a QObject parent and is thus automatically destroyed.
 348         // See #4758.
 349         // delete completer_;
 350         delete d;
 351 }
 352
 353
 354 Qt::CursorShape GuiWorkArea::cursorShape() const
 355 {
 356         return viewport()->cursor().shape();
 357 }
 358
 359
 360 void GuiWorkArea::Private::setCursorShape(Qt::CursorShape shape)
 361 {
 362         p->viewport()->setCursor(shape);
 363 }
 364
 365
 366 void GuiWorkArea::Private::updateCursorShape()
 367 {
 368         setCursorShape(buffer_view_->clickableInset()
 369                 ? Qt::PointingHandCursor : Qt::IBeamCursor);
 370 }
 371
 372
 373 void GuiWorkArea::setGuiView(GuiView & gv)
 374 {
 375         d->lyx_view_ = &gv;
 376 }
 377
 378
 379 void GuiWorkArea::setBuffer(Buffer & buffer)
 380 {
 381         delete d->buffer_view_;
 382         d->buffer_view_ = new BufferView(buffer);
 383         buffer.workAreaManager().add(this);
 384
 385         // HACK: Prevents an additional redraw when the scrollbar pops up
 386         // which regularily happens on documents with more than one page.
 387         // The policy  should be set to "Qt::ScrollBarAsNeeded" soon.
 388         // Since we have no geometry information yet, we assume that
 389         // a document needs a scrollbar if there is more then four
 390         // paragraph in the outermost text.
 391         if (buffer.text().paragraphs().size() > 4)
 392                 setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
 393         QTimer::singleShot(50, this, SLOT(fixVerticalScrollBar()));
 394 }
 395
 396
 397 void GuiWorkArea::fixVerticalScrollBar()
 398 {
 399         if (!isFullScreen())
 400                 setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
 401 }
 402
 403
 404 void GuiWorkArea::close()
 405 {
 406         d->lyx_view_->removeWorkArea(this);
 407 }
 408
 409
 410 void GuiWorkArea::setFullScreen(bool full_screen)
 411 {
 412         d->buffer_view_->setFullScreen(full_screen);
 413         setFrameStyle(QFrame::NoFrame);
 414         if (full_screen) {
 415                 setFrameStyle(QFrame::NoFrame);
 416                 if (lyxrc.full_screen_scrollbar)
 417                         setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 418         } else
 419                 setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
 420 }
 421
 422
 423 BufferView & GuiWorkArea::bufferView()
 424 {
 425         return *d->buffer_view_;
 426 }
 427
 428
 429 BufferView const & GuiWorkArea::bufferView() const
 430 {
 431         return *d->buffer_view_;
 432 }
 433
 434
 435 void GuiWorkArea::stopBlinkingCursor()
 436 {
 437         d->cursor_timeout_.stop();
 438         d->hideCursor();
 439 }
 440
 441
 442 void GuiWorkArea::startBlinkingCursor()
 443 {
 444         // do not show the cursor if the view is busy
 445         if (view().busy())
 446                 return;
 447
 448         Point p;
 449         int h = 0;
 450         d->buffer_view_->cursorPosAndHeight(p, h);
 451         // Don't start blinking if the cursor isn't on screen.
 452         if (!d->buffer_view_->cursorInView(p, h))
 453                 return;
 454
 455         d->showCursor();
 456
 457         //we're not supposed to cache this value.
 458         int const time = QApplication::cursorFlashTime() / 2;
 459         if (time <= 0)
 460                 return;
 461         d->cursor_timeout_.setInterval(time);
 462         d->cursor_timeout_.start();
 463 }
 464
 465
 466 void GuiWorkArea::redraw(bool update_metrics)
 467 {
 468         if (!isVisible())
 469                 // No need to redraw in this case.
 470                 return;
 471
 472         // No need to do anything if this is the current view. The BufferView
 473         // metrics are already up to date.
 474         if (update_metrics || d->lyx_view_ != guiApp->currentView()
 475                 || d->lyx_view_->currentWorkArea() != this) {
 476                 // FIXME: it would be nice to optimize for the off-screen case.
 477                 d->buffer_view_->cursor().fixIfBroken();
 478                 d->buffer_view_->updateMetrics();
 479                 d->buffer_view_->cursor().fixIfBroken();
 480         }
 481
 482         // update cursor position, because otherwise it has to wait until
 483         // the blinking interval is over
 484         if (d->cursor_visible_) {
 485                 d->hideCursor();
 486                 d->showCursor();
 487         }
 488
 489         LYXERR(Debug::WORKAREA, "WorkArea::redraw screen");
 490         d->updateScreen();
 491         update(0, 0, viewport()->width(), viewport()->height());
 492
 493         /// \warning: scrollbar updating *must* be done after the BufferView is drawn
 494         /// because \c BufferView::updateScrollbar() is called in \c BufferView::draw().
 495         d->updateScrollbar();
 496         d->lyx_view_->updateStatusBar();
 497
 498         if (lyxerr.debugging(Debug::WORKAREA))
 499                 d->buffer_view_->coordCache().dump();
 500
 501         updateWindowTitle();
 502
 503         d->updateCursorShape();
 504 }
 505
 506
 507 void GuiWorkArea::processKeySym(KeySymbol const & key, KeyModifier mod)
 508 {
 509         if (d->lyx_view_->isFullScreen() && d->lyx_view_->menuBar()->isVisible()
 510                 && lyxrc.full_screen_menubar) {
 511                 // FIXME HACK: we should not have to do this here. See related comment
 512                 // in GuiView::event() (QEvent::ShortcutOverride)
 513                 d->lyx_view_->menuBar()->hide();
 514         }
 515
 516         // In order to avoid bad surprise in the middle of an operation,
 517         // we better stop the blinking cursor...
 518         // the cursor gets restarted in GuiView::restartCursor()
 519         stopBlinkingCursor();
 520         guiApp->processKeySym(key, mod);
 521 }
 522
 523
 524 void GuiWorkArea::Private::dispatch(FuncRequest const & cmd)
 525 {
 526         // Handle drag&drop
 527         if (cmd.action() == LFUN_FILE_OPEN) {
 528                 DispatchResult dr;
 529                 lyx_view_->dispatch(cmd, dr);
 530                 return;
 531         }
 532
 533         bool const notJustMovingTheMouse =
 534                 cmd.action() != LFUN_MOUSE_MOTION || cmd.button() != mouse_button::none;
 535
 536         // In order to avoid bad surprise in the middle of an operation, we better stop
 537         // the blinking cursor.
 538         if (notJustMovingTheMouse)
 539                 p->stopBlinkingCursor();
 540
 541         buffer_view_->mouseEventDispatch(cmd);
 542
 543         // Skip these when selecting
 544         // FIXME: let GuiView take care of those.
 545         if (cmd.action() != LFUN_MOUSE_MOTION) {
 546                 completer_->updateVisibility(false, false);
 547                 lyx_view_->updateDialogs();
 548                 lyx_view_->updateStatusBar();
 549         }
 550
 551         // GUI tweaks except with mouse motion with no button pressed.
 552         if (notJustMovingTheMouse) {
 553                 // Slight hack: this is only called currently when we
 554                 // clicked somewhere, so we force through the display
 555                 // of the new status here.
 556                 // FIXME: let GuiView take care of those.
 557                 lyx_view_->clearMessage();
 558
 559                 // Show the cursor immediately after any operation
 560                 p->startBlinkingCursor();
 561         }
 562
 563         updateCursorShape();
 564 }
 565
 566
 567 void GuiWorkArea::Private::resizeBufferView()
 568 {
 569         // WARNING: Please don't put any code that will trigger a repaint here!
 570         // We are already inside a paint event.
 571         p->stopBlinkingCursor();
 572         // Warn our container (GuiView).
 573         p->busy(true);
 574
 575         Point point;
 576         int h = 0;
 577         buffer_view_->cursorPosAndHeight(point, h);
 578         bool const cursor_in_view = buffer_view_->cursorInView(point, h);
 579         buffer_view_->resize(p->viewport()->width(), p->viewport()->height());
 580         if (cursor_in_view)
 581                 buffer_view_->scrollToCursor();
 582         updateScreen();
 583
 584         // Update scrollbars which might have changed due different
 585         // BufferView dimension. This is especially important when the
 586         // BufferView goes from zero-size to the real-size for the first time,
 587         // as the scrollbar paramters are then set for the first time.
 588         updateScrollbar();
 589
 590         need_resize_ = false;
 591         p->busy(false);
 592         // Eventually, restart the cursor after the resize event.
 593         // We might be resizing even if the focus is on another widget so we only
 594         // restart the cursor if we have the focus.
 595         if (p->hasFocus())
 596                 QTimer::singleShot(50, p, SLOT(startBlinkingCursor()));
 597 }
 598
 599
 600 void GuiWorkArea::Private::showCursor()
 601 {
 602         if (cursor_visible_)
 603                 return;
 604
 605         Point p;
 606         int h = 0;
 607         buffer_view_->cursorPosAndHeight(p, h);
 608         if (!buffer_view_->cursorInView(p, h))
 609                 return;
 610
 611         // RTL or not RTL
 612         bool l_shape = false;
 613         Font const & realfont = buffer_view_->cursor().real_current_font;
 614         BufferParams const & bp = buffer_view_->buffer().params();
 615         bool const samelang = realfont.language() == bp.language;
 616         bool const isrtl = realfont.isVisibleRightToLeft();
 617
 618         if (!samelang || isrtl != bp.language->rightToLeft())
 619                 l_shape = true;
 620
 621         // The ERT language hack needs fixing up
 622         if (realfont.language() == latex_language)
 623                 l_shape = false;
 624
 625         // show cursor on screen
 626         Cursor & cur = buffer_view_->cursor();
 627         bool completable = cur.inset().showCompletionCursor()
 628                 && completer_->completionAvailable()
 629                 && !completer_->popupVisible()
 630                 && !completer_->inlineVisible();
 631         cursor_visible_ = true;
 632         cursor_->recomputeWidth();
 633
 634         //int cur_x = buffer_view_->getPos(cur).x_;
 635         // We may have decided to slide the cursor row so that cursor
 636         // is visible.
 637         p.x_ -= buffer_view_->horizScrollOffset();
 638
 639         showCursor(p.x_, p.y_, h, l_shape, isrtl, completable);
 640 }
 641
 642
 643 void GuiWorkArea::Private::hideCursor()
 644 {
 645         if (!cursor_visible_)
 646                 return;
 647
 648         cursor_visible_ = false;
 649         removeCursor();
 650 }
 651
 652
 653 void GuiWorkArea::toggleCursor()
 654 {
 655         if (d->cursor_visible_)
 656                 d->hideCursor();
 657         else
 658                 d->showCursor();
 659 }
 660
 661
 662 void GuiWorkArea::Private::updateScrollbar()
 663 {
 664         ScrollbarParameters const & scroll_ = buffer_view_->scrollbarParameters();
 665         // WARNING: don't touch at the scrollbar value like this:
 666         //   verticalScrollBar()->setValue(scroll_.position);
 667         // because this would cause a recursive signal/slot calling with
 668         // GuiWorkArea::scrollTo
 669         p->verticalScrollBar()->setRange(scroll_.min, scroll_.max);
 670         p->verticalScrollBar()->setPageStep(scroll_.page_step);
 671         p->verticalScrollBar()->setSingleStep(scroll_.single_step);
 672         p->verticalScrollBar()->setSliderPosition(0);
 673 }
 674
 675
 676 void GuiWorkArea::scrollTo(int value)
 677 {
 678         stopBlinkingCursor();
 679         d->buffer_view_->scrollDocView(value, true);
 680
 681         if (lyxrc.cursor_follows_scrollbar) {
 682                 d->buffer_view_->setCursorFromScrollbar();
 683                 // FIXME: let GuiView take care of those.
 684                 d->lyx_view_->updateLayoutList();
 685         }
 686         // Show the cursor immediately after any operation.
 687         startBlinkingCursor();
 688         // FIXME QT5
 689 #ifdef Q_WS_X11
 690         QApplication::syncX();
 691 #endif
 692 }
 693
 694
 695 bool GuiWorkArea::event(QEvent * e)
 696 {
 697         switch (e->type()) {
 698         case QEvent::ToolTip: {
 699                 QHelpEvent * helpEvent = static_cast<QHelpEvent *>(e);
 700                 if (lyxrc.use_tooltip) {
 701                         QPoint pos = helpEvent->pos();
 702                         if (pos.x() < viewport()->width()) {
 703                                 QString s = toqstr(d->buffer_view_->toolTip(pos.x(), pos.y()));
 704                                 QToolTip::showText(helpEvent->globalPos(), s);
 705                         }
 706                         else
 707                                 QToolTip::hideText();
 708                 }
 709                 // Don't forget to accept the event!
 710                 e->accept();
 711                 return true;
 712         }
 713
 714         case QEvent::KeyPress: {
 715                 // We catch this event in order to catch the Tab or Shift+Tab key press
 716                 // which are otherwise reserved to focus switching between controls
 717                 // within a dialog.
 718                 QKeyEvent * ke = static_cast<QKeyEvent*>(e);
 719                 if ((ke->key() == Qt::Key_Tab && ke->modifiers() == Qt::NoModifier)
 720                         || (ke->key() == Qt::Key_Backtab && (
 721                                 ke->modifiers() == Qt::ShiftModifier
 722                                 || ke->modifiers() == Qt::NoModifier))) {
 723                         keyPressEvent(ke);
 724                         return true;
 725                 }
 726                 return QAbstractScrollArea::event(e);
 727         }
 728
 729         default:
 730                 return QAbstractScrollArea::event(e);
 731         }
 732         return false;
 733 }
 734
 735
 736 void GuiWorkArea::contextMenuEvent(QContextMenuEvent * e)
 737 {
 738         string name;
 739         if (e->reason() == QContextMenuEvent::Mouse)
 740                 // the menu name is set on mouse press
 741                 name = d->context_menu_name_;
 742         else {
 743                 QPoint pos = e->pos();
 744                 Cursor const & cur = d->buffer_view_->cursor();
 745                 if (e->reason() == QContextMenuEvent::Keyboard && cur.inTexted()) {
 746                         // Do not access the context menu of math right in front of before
 747                         // the cursor. This does not work when the cursor is in text.
 748                         Inset * inset = cur.paragraph().getInset(cur.pos());
 749                         if (inset && inset->asInsetMath())
 750                                 --pos.rx();
 751                         else if (cur.pos() > 0) {
 752                                 Inset * inset = cur.paragraph().getInset(cur.pos() - 1);
 753                                 if (inset)
 754                                         ++pos.rx();
 755                         }
 756                 }
 757                 name = d->buffer_view_->contextMenu(pos.x(), pos.y());
 758         }
 759
 760         if (name.empty()) {
 761                 QAbstractScrollArea::contextMenuEvent(e);
 762                 return;
 763         }
 764         // always show mnemonics when the keyboard is used to show the context menu
 765         // FIXME: This should be fixed in Qt itself
 766         bool const keyboard = (e->reason() == QContextMenuEvent::Keyboard);
 767         QMenu * menu = guiApp->menus().menu(toqstr(name), *d->lyx_view_, keyboard);
 768         if (!menu) {
 769                 QAbstractScrollArea::contextMenuEvent(e);
 770                 return;
 771         }
 772         // Position the menu to the right.
 773         // FIXME: menu position should be different for RTL text.
 774         menu->exec(e->globalPos());
 775         e->accept();
 776 }
 777
 778
 779 void GuiWorkArea::focusInEvent(QFocusEvent * e)
 780 {
 781         LYXERR(Debug::DEBUG, "GuiWorkArea::focusInEvent(): " << this << endl);
 782         if (d->lyx_view_->currentWorkArea() != this) {
 783                 d->lyx_view_->setCurrentWorkArea(this);
 784                 d->lyx_view_->currentWorkArea()->bufferView().buffer().updateBuffer();
 785         }
 786
 787         startBlinkingCursor();
 788         QAbstractScrollArea::focusInEvent(e);
 789 }
 790
 791
 792 void GuiWorkArea::focusOutEvent(QFocusEvent * e)
 793 {
 794         LYXERR(Debug::DEBUG, "GuiWorkArea::focusOutEvent(): " << this << endl);
 795         stopBlinkingCursor();
 796         QAbstractScrollArea::focusOutEvent(e);
 797 }
 798
 799
 800 void GuiWorkArea::mousePressEvent(QMouseEvent * e)
 801 {
 802         if (d->dc_event_.active && d->dc_event_ == *e) {
 803                 d->dc_event_.active = false;
 804                 FuncRequest cmd(LFUN_MOUSE_TRIPLE, e->x(), e->y(),
 805                         q_button_state(e->button()), q_key_state(e->modifiers()));
 806                 d->dispatch(cmd);
 807                 e->accept();
 808                 return;
 809         }
 810
 811 #if (QT_VERSION < 0x050000) && !defined(__HAIKU__)
 812         inputContext()->reset();
 813 #endif
 814
 815         FuncRequest const cmd(LFUN_MOUSE_PRESS, e->x(), e->y(),
 816                         q_button_state(e->button()), q_key_state(e->modifiers()));
 817         d->dispatch(cmd);
 818
 819         // Save the context menu on mouse press, because also the mouse
 820         // cursor is set on mouse press. Afterwards, we can either release
 821         // the mousebutton somewhere else, or the cursor might have moved
 822         // due to the DEPM. We need to do this after the mouse has been
 823         // set in dispatch(), because the selection state might change.
 824         if (e->button() == Qt::RightButton)
 825                 d->context_menu_name_ = d->buffer_view_->contextMenu(e->x(), e->y());
 826
 827         e->accept();
 828 }
 829
 830
 831 void GuiWorkArea::mouseReleaseEvent(QMouseEvent * e)
 832 {
 833         if (d->synthetic_mouse_event_.timeout.running())
 834                 d->synthetic_mouse_event_.timeout.stop();
 835
 836         FuncRequest const cmd(LFUN_MOUSE_RELEASE, e->x(), e->y(),
 837                         q_button_state(e->button()), q_key_state(e->modifiers()));
 838         d->dispatch(cmd);
 839         e->accept();
 840 }
 841
 842
 843 void GuiWorkArea::mouseMoveEvent(QMouseEvent * e)
 844 {
 845         // we kill the triple click if we move
 846         doubleClickTimeout();
 847         FuncRequest cmd(LFUN_MOUSE_MOTION, e->x(), e->y(),
 848                         q_motion_state(e->buttons()), q_key_state(e->modifiers()));
 849
 850         e->accept();
 851
 852         // If we're above or below the work area...
 853         if ((e->y() <= 20 || e->y() >= viewport()->height() - 20)
 854                         && e->buttons() == mouse_button::button1) {
 855                 // Make sure only a synthetic event can cause a page scroll,
 856                 // so they come at a steady rate:
 857                 if (e->y() <= 20)
 858                         // _Force_ a scroll up:
 859                         cmd.set_y(e->y() - 21);
 860                 else
 861                         cmd.set_y(e->y() + 21);
 862                 // Store the event, to be handled when the timeout expires.
 863                 d->synthetic_mouse_event_.cmd = cmd;
 864
 865                 if (d->synthetic_mouse_event_.timeout.running()) {
 866                         // Discard the event. Note that it _may_ be handled
 867                         // when the timeout expires if
 868                         // synthetic_mouse_event_.cmd has not been overwritten.
 869                         // Ie, when the timeout expires, we handle the
 870                         // most recent event but discard all others that
 871                         // occurred after the one used to start the timeout
 872                         // in the first place.
 873                         return;
 874                 }
 875
 876                 d->synthetic_mouse_event_.restart_timeout = true;
 877                 d->synthetic_mouse_event_.timeout.start();
 878                 // Fall through to handle this event...
 879
 880         } else if (d->synthetic_mouse_event_.timeout.running()) {
 881                 // Store the event, to be possibly handled when the timeout
 882                 // expires.
 883                 // Once the timeout has expired, normal control is returned
 884                 // to mouseMoveEvent (restart_timeout = false).
 885                 // This results in a much smoother 'feel' when moving the
 886                 // mouse back into the work area.
 887                 d->synthetic_mouse_event_.cmd = cmd;
 888                 d->synthetic_mouse_event_.restart_timeout = false;
 889                 return;
 890         }
 891         d->dispatch(cmd);
 892 }
 893
 894
 895 void GuiWorkArea::wheelEvent(QWheelEvent * ev)
 896 {
 897         // Wheel rotation by one notch results in a delta() of 120 (see
 898         // documentation of QWheelEvent)
 899         double const delta = ev->delta() / 120.0;
 900         bool zoom = false;
 901         switch (lyxrc.scroll_wheel_zoom) {
 902         case LyXRC::SCROLL_WHEEL_ZOOM_CTRL:
 903                 zoom = ev->modifiers() & Qt::ControlModifier;
 904                 zoom &= !(ev->modifiers() & (Qt::ShiftModifier | Qt::AltModifier));
 905                 break;
 906         case LyXRC::SCROLL_WHEEL_ZOOM_SHIFT:
 907                 zoom = ev->modifiers() & Qt::ShiftModifier;
 908                 zoom &= !(ev->modifiers() & (Qt::ControlModifier | Qt::AltModifier));
 909                 break;
 910         case LyXRC::SCROLL_WHEEL_ZOOM_ALT:
 911                 zoom = ev->modifiers() & Qt::AltModifier;
 912                 zoom &= !(ev->modifiers() & (Qt::ShiftModifier | Qt::ControlModifier));
 913                 break;
 914         case LyXRC::SCROLL_WHEEL_ZOOM_OFF:
 915                 break;
 916         }
 917         if (zoom) {
 918                 docstring arg = convert<docstring>(int(5 * delta));
 919                 lyx::dispatch(FuncRequest(LFUN_BUFFER_ZOOM_IN, arg));
 920                 return;
 921         }
 922
 923         // Take into account the desktop wide settings.
 924         int const lines = qApp->wheelScrollLines();
 925         int const page_step = verticalScrollBar()->pageStep();
 926         // Test if the wheel mouse is set to one screen at a time.
 927         // This is according to
 928         // https://doc.qt.io/qt-5/qapplication.html#wheelScrollLines-prop
 929         int scroll_value =
 930                 min(lines * verticalScrollBar()->singleStep(), page_step);
 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 #if defined(Q_WS_X11) || defined(QPA_XCB)
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, ev->x(), ev->y(),
1111                         q_button_state(ev->button()), q_key_state(ev->modifiers()));
1112         d->dispatch(cmd);
1113         ev->accept();
1114 }
1115
1116
1117 void GuiWorkArea::resizeEvent(QResizeEvent * ev)
1118 {
1119         QAbstractScrollArea::resizeEvent(ev);
1120         d->need_resize_ = true;
1121         ev->accept();
1122 }
1123
1124
1125 void GuiWorkArea::Private::update(int x, int y, int w, int h)
1126 {
1127         p->viewport()->update(x, y, w, h);
1128 }
1129
1130
1131 void GuiWorkArea::paintEvent(QPaintEvent * ev)
1132 {
1133         QRectF const rc = ev->rect();
1134         // LYXERR(Debug::PAINTING, "paintEvent begin: x: " << rc.x()
1135         //      << " y: " << rc.y() << " w: " << rc.width() << " h: " << rc.height());
1136
1137         if (d->needResize()) {
1138                 d->resetScreen();
1139                 d->resizeBufferView();
1140                 if (d->cursor_visible_) {
1141                         d->hideCursor();
1142                         d->showCursor();
1143                 }
1144         }
1145
1146         QPainter pain(viewport());
1147         double const pr = pixelRatio();
1148         QRectF const rcs = QRectF(rc.x() * pr, rc.y() * pr, rc.width() * pr, rc.height() * pr);
1149
1150         if (lyxrc.use_qimage) {
1151                 QImage const & image = static_cast<QImage const &>(*d->screen_);
1152                 pain.drawImage(rc, image, rcs);
1153         } else {
1154                 QPixmap const & pixmap = static_cast<QPixmap const &>(*d->screen_);
1155                 pain.drawPixmap(rc, pixmap, rcs);
1156         }
1157         d->cursor_->draw(pain);
1158         ev->accept();
1159 }
1160
1161
1162 void GuiWorkArea::Private::updateScreen()
1163 {
1164         GuiPainter pain(screen_, p->pixelRatio());
1165         buffer_view_->draw(pain);
1166 }
1167
1168
1169 void GuiWorkArea::Private::showCursor(int x, int y, int h,
1170         bool l_shape, bool rtl, bool completable)
1171 {
1172         if (schedule_redraw_) {
1173                 // This happens when a graphic conversion is finished. As we don't know
1174                 // the size of the new graphics, it's better the update everything.
1175                 // We can't use redraw() here because this would trigger a infinite
1176                 // recursive loop with showCursor().
1177                 buffer_view_->resize(p->viewport()->width(), p->viewport()->height());
1178                 updateScreen();
1179                 updateScrollbar();
1180                 p->viewport()->update(QRect(0, 0, p->viewport()->width(), p->viewport()->height()));
1181                 schedule_redraw_ = false;
1182                 // Show the cursor immediately after the update.
1183                 hideCursor();
1184                 p->toggleCursor();
1185                 return;
1186         }
1187
1188         cursor_->update(x, y, h, l_shape, rtl, completable);
1189         cursor_->show();
1190         p->viewport()->update(cursor_->rect());
1191 }
1192
1193
1194 void GuiWorkArea::Private::removeCursor()
1195 {
1196         cursor_->hide();
1197         //if (!qApp->focusWidget())
1198                 p->viewport()->update(cursor_->rect());
1199 }
1200
1201
1202 void GuiWorkArea::inputMethodEvent(QInputMethodEvent * e)
1203 {
1204         QString const & commit_string = e->commitString();
1205         docstring const & preedit_string
1206                 = qstring_to_ucs4(e->preeditString());
1207
1208         if (!commit_string.isEmpty()) {
1209
1210                 LYXERR(Debug::KEY, "preeditString: " << e->preeditString()
1211                         << " commitString: " << e->commitString());
1212
1213                 int key = 0;
1214
1215                 // FIXME Iwami 04/01/07: we should take care also of UTF16 surrogates here.
1216                 for (int i = 0; i != commit_string.size(); ++i) {
1217                         QKeyEvent ev(QEvent::KeyPress, key, Qt::NoModifier, commit_string[i]);
1218                         keyPressEvent(&ev);
1219                 }
1220         }
1221
1222         // Hide the cursor during the kana-kanji transformation.
1223         if (preedit_string.empty())
1224                 startBlinkingCursor();
1225         else
1226                 stopBlinkingCursor();
1227
1228         // last_width : for checking if last preedit string was/wasn't empty.
1229         // FIXME THREAD
1230         // We could have more than one work area, right?
1231         static bool last_width = false;
1232         if (!last_width && preedit_string.empty()) {
1233                 // if last_width is last length of preedit string.
1234                 e->accept();
1235                 return;
1236         }
1237
1238         GuiPainter pain(d->screen_, pixelRatio());
1239         d->buffer_view_->updateMetrics();
1240         d->buffer_view_->draw(pain);
1241         FontInfo font = d->buffer_view_->cursor().getFont().fontInfo();
1242         FontMetrics const & fm = theFontMetrics(font);
1243         int height = fm.maxHeight();
1244         int cur_x = d->cursor_->rect().left();
1245         int cur_y = d->cursor_->rect().bottom();
1246
1247         // redraw area of preedit string.
1248         update(0, cur_y - height, viewport()->width(),
1249                 (height + 1) * d->preedit_lines_);
1250
1251         if (preedit_string.empty()) {
1252                 last_width = false;
1253                 d->preedit_lines_ = 1;
1254                 e->accept();
1255                 return;
1256         }
1257         last_width = true;
1258
1259         // att : stores an IM attribute.
1260         QList<QInputMethodEvent::Attribute> const & att = e->attributes();
1261
1262         // get attributes of input method cursor.
1263         // cursor_pos : cursor position in preedit string.
1264         size_t cursor_pos = 0;
1265         bool cursor_is_visible = false;
1266         for (int i = 0; i != att.size(); ++i) {
1267                 if (att.at(i).type == QInputMethodEvent::Cursor) {
1268                         cursor_pos = att.at(i).start;
1269                         cursor_is_visible = att.at(i).length != 0;
1270                         break;
1271                 }
1272         }
1273
1274         size_t preedit_length = preedit_string.length();
1275
1276         // get position of selection in input method.
1277         // FIXME: isn't there a way to do this simplier?
1278         // rStart : cursor position in selected string in IM.
1279         size_t rStart = 0;
1280         // rLength : selected string length in IM.
1281         size_t rLength = 0;
1282         if (cursor_pos < preedit_length) {
1283                 for (int i = 0; i != att.size(); ++i) {
1284                         if (att.at(i).type == QInputMethodEvent::TextFormat) {
1285                                 if (att.at(i).start <= int(cursor_pos)
1286                                         && int(cursor_pos) < att.at(i).start + att.at(i).length) {
1287                                                 rStart = att.at(i).start;
1288                                                 rLength = att.at(i).length;
1289                                                 if (!cursor_is_visible)
1290                                                         cursor_pos += rLength;
1291                                                 break;
1292                                 }
1293                         }
1294                 }
1295         }
1296         else {
1297                 rStart = cursor_pos;
1298                 rLength = 0;
1299         }
1300
1301         int const right_margin = d->buffer_view_->rightMargin();
1302         Painter::preedit_style ps;
1303         // Most often there would be only one line:
1304         d->preedit_lines_ = 1;
1305         for (size_t pos = 0; pos != preedit_length; ++pos) {
1306                 char_type const typed_char = preedit_string[pos];
1307                 // reset preedit string style
1308                 ps = Painter::preedit_default;
1309
1310                 // if we reached the right extremity of the screen, go to next line.
1311                 if (cur_x + fm.width(typed_char) > viewport()->width() - right_margin) {
1312                         cur_x = right_margin;
1313                         cur_y += height + 1;
1314                         ++d->preedit_lines_;
1315                 }
1316                 // preedit strings are displayed with dashed underline
1317                 // and partial strings are displayed white on black indicating
1318                 // that we are in selecting mode in the input method.
1319                 // FIXME: rLength == preedit_length is not a changing condition
1320                 // FIXME: should be put out of the loop.
1321                 if (pos >= rStart
1322                         && pos < rStart + rLength
1323                         && !(cursor_pos < rLength && rLength == preedit_length))
1324                         ps = Painter::preedit_selecting;
1325
1326                 if (pos == cursor_pos
1327                         && (cursor_pos < rLength && rLength == preedit_length))
1328                         ps = Painter::preedit_cursor;
1329
1330                 // draw one character and update cur_x.
1331                 cur_x += pain.preeditText(cur_x, cur_y, typed_char, font, ps);
1332         }
1333
1334         // update the preedit string screen area.
1335         update(0, cur_y - d->preedit_lines_*height, viewport()->width(),
1336                 (height + 1) * d->preedit_lines_);
1337
1338         // Don't forget to accept the event!
1339         e->accept();
1340 }
1341
1342
1343 QVariant GuiWorkArea::inputMethodQuery(Qt::InputMethodQuery query) const
1344 {
1345         QRect cur_r(0, 0, 0, 0);
1346         switch (query) {
1347                 // this is the CJK-specific composition window position and
1348                 // the context menu position when the menu key is pressed.
1349                 case Qt::ImMicroFocus:
1350                         cur_r = d->cursor_->rect();
1351                         if (d->preedit_lines_ != 1)
1352                                 cur_r.moveLeft(10);
1353                         cur_r.moveBottom(cur_r.bottom()
1354                                 + cur_r.height() * (d->preedit_lines_ - 1));
1355                         // return lower right of cursor in LyX.
1356                         return cur_r;
1357                 default:
1358                         return QWidget::inputMethodQuery(query);
1359         }
1360 }
1361
1362
1363 void GuiWorkArea::updateWindowTitle()
1364 {
1365         docstring maximize_title;
1366         docstring minimize_title;
1367
1368         Buffer const & buf = d->buffer_view_->buffer();
1369         FileName const file_name = buf.fileName();
1370         if (!file_name.empty()) {
1371                 maximize_title = file_name.displayName(130);
1372                 minimize_title = from_utf8(file_name.onlyFileName());
1373                 if (buf.lyxvc().inUse()) {
1374                         if (buf.lyxvc().locking())
1375                                 maximize_title +=  _(" (version control, locking)");
1376                         else
1377                                 maximize_title +=  _(" (version control)");
1378                 }
1379                 if (!buf.isClean()) {
1380                         maximize_title += _(" (changed)");
1381                         minimize_title += char_type('*');
1382                 }
1383                 if (buf.isReadonly())
1384                         maximize_title += _(" (read only)");
1385         }
1386
1387         QString const new_title = toqstr(maximize_title);
1388         if (new_title != windowTitle()) {
1389                 QWidget::setWindowTitle(new_title);
1390                 QWidget::setWindowIconText(toqstr(minimize_title));
1391                 titleChanged(this);
1392         }
1393 }
1394
1395
1396 bool GuiWorkArea::isFullScreen() const
1397 {
1398         return d->lyx_view_ && d->lyx_view_->isFullScreen();
1399 }
1400
1401
1402 void GuiWorkArea::scheduleRedraw()
1403 {
1404         d->schedule_redraw_ = true;
1405 }
1406
1407
1408 bool GuiWorkArea::inDialogMode() const
1409 {
1410         return d->dialog_mode_;
1411 }
1412
1413
1414 void GuiWorkArea::setDialogMode(bool mode)
1415 {
1416         d->dialog_mode_ = mode;
1417 }
1418
1419
1420 GuiCompleter & GuiWorkArea::completer()
1421 {
1422         return *d->completer_;
1423 }
1424
1425 GuiView const & GuiWorkArea::view() const
1426 {
1427         return *d->lyx_view_;
1428 }
1429
1430
1431 GuiView & GuiWorkArea::view()
1432 {
1433         return *d->lyx_view_;
1434 }
1435
1436 ////////////////////////////////////////////////////////////////////
1437 //
1438 // EmbeddedWorkArea
1439 //
1440 ////////////////////////////////////////////////////////////////////
1441
1442
1443 EmbeddedWorkArea::EmbeddedWorkArea(QWidget * w): GuiWorkArea(w)
1444 {
1445         support::TempFile tempfile("embedded.internal");
1446         tempfile.setAutoRemove(false);
1447         buffer_ = theBufferList().newInternalBuffer(tempfile.name().absFileName());
1448         buffer_->setUnnamed(true);
1449         buffer_->setFullyLoaded(true);
1450         setBuffer(*buffer_);
1451         setDialogMode(true);
1452 }
1453
1454
1455 EmbeddedWorkArea::~EmbeddedWorkArea()
1456 {
1457         // No need to destroy buffer and bufferview here, because it is done
1458         // in theBufferList() destruction loop at application exit
1459 }
1460
1461
1462 void EmbeddedWorkArea::closeEvent(QCloseEvent * ev)
1463 {
1464         disable();
1465         GuiWorkArea::closeEvent(ev);
1466 }
1467
1468
1469 void EmbeddedWorkArea::hideEvent(QHideEvent * ev)
1470 {
1471         disable();
1472         GuiWorkArea::hideEvent(ev);
1473 }
1474
1475
1476 QSize EmbeddedWorkArea::sizeHint () const
1477 {
1478         // FIXME(?):
1479         // GuiWorkArea sets the size to the screen's viewport
1480         // by returning a value this gets overridden
1481         // EmbeddedWorkArea is now sized to fit in the layout
1482         // of the parent, and has a minimum size set in GuiWorkArea
1483         // which is what we return here
1484         return QSize(100, 70);
1485 }
1486
1487
1488 void EmbeddedWorkArea::disable()
1489 {
1490         stopBlinkingCursor();
1491         if (view().currentWorkArea() != this)
1492                 return;
1493         // No problem if currentMainWorkArea() is 0 (setCurrentWorkArea()
1494         // tolerates it and shows the background logo), what happens if
1495         // an EmbeddedWorkArea is closed after closing all document WAs
1496         view().setCurrentWorkArea(view().currentMainWorkArea());
1497 }
1498
1499 ////////////////////////////////////////////////////////////////////
1500 //
1501 // TabWorkArea
1502 //
1503 ////////////////////////////////////////////////////////////////////
1504
1505 #ifdef Q_OS_MAC
1506 class NoTabFrameMacStyle : public QProxyStyle {
1507 public:
1508         ///
1509         QRect subElementRect(SubElement element, const QStyleOption * option,
1510                              const QWidget * widget = 0) const
1511         {
1512                 QRect rect = QProxyStyle::subElementRect(element, option, widget);
1513                 bool noBar = static_cast<QTabWidget const *>(widget)->count() <= 1;
1514
1515                 // The Qt Mac style puts the contents into a 3 pixel wide box
1516                 // which looks very ugly and not like other Mac applications.
1517                 // Hence we remove this here, and moreover the 16 pixel round
1518                 // frame above if the tab bar is hidden.
1519                 if (element == QStyle::SE_TabWidgetTabContents) {
1520                         rect.adjust(- rect.left(), 0, rect.left(), 0);
1521                         if (noBar)
1522                                 rect.setTop(0);
1523                 }
1524
1525                 return rect;
1526         }
1527 };
1528
1529 NoTabFrameMacStyle noTabFrameMacStyle;
1530 #endif
1531
1532
1533 TabWorkArea::TabWorkArea(QWidget * parent)
1534         : QTabWidget(parent), clicked_tab_(-1)
1535 {
1536 #ifdef Q_OS_MAC
1537         setStyle(&noTabFrameMacStyle);
1538 #endif
1539
1540         QPalette pal = palette();
1541         pal.setColor(QPalette::Active, QPalette::Button,
1542                 pal.color(QPalette::Active, QPalette::Window));
1543         pal.setColor(QPalette::Disabled, QPalette::Button,
1544                 pal.color(QPalette::Disabled, QPalette::Window));
1545         pal.setColor(QPalette::Inactive, QPalette::Button,
1546                 pal.color(QPalette::Inactive, QPalette::Window));
1547
1548         QObject::connect(this, SIGNAL(currentChanged(int)),
1549                 this, SLOT(on_currentTabChanged(int)));
1550
1551         closeBufferButton = new QToolButton(this);
1552         closeBufferButton->setPalette(pal);
1553         // FIXME: rename the icon to closebuffer.png
1554         closeBufferButton->setIcon(QIcon(getPixmap("images/", "closetab", "svgz,png")));
1555         closeBufferButton->setText("Close File");
1556         closeBufferButton->setAutoRaise(true);
1557         closeBufferButton->setCursor(Qt::ArrowCursor);
1558         closeBufferButton->setToolTip(qt_("Close File"));
1559         closeBufferButton->setEnabled(true);
1560         QObject::connect(closeBufferButton, SIGNAL(clicked()),
1561                 this, SLOT(closeCurrentBuffer()));
1562         setCornerWidget(closeBufferButton, Qt::TopRightCorner);
1563
1564         // setup drag'n'drop
1565         QTabBar* tb = new DragTabBar;
1566         connect(tb, SIGNAL(tabMoveRequested(int, int)),
1567                 this, SLOT(moveTab(int, int)));
1568         tb->setElideMode(Qt::ElideNone);
1569         setTabBar(tb);
1570
1571         // make us responsible for the context menu of the tabbar
1572         tb->setContextMenuPolicy(Qt::CustomContextMenu);
1573         connect(tb, SIGNAL(customContextMenuRequested(const QPoint &)),
1574                 this, SLOT(showContextMenu(const QPoint &)));
1575         connect(tb, SIGNAL(tabCloseRequested(int)),
1576                 this, SLOT(closeTab(int)));
1577
1578         setUsesScrollButtons(true);
1579 }
1580
1581
1582 void TabWorkArea::paintEvent(QPaintEvent * event)
1583 {
1584         if (tabBar()->isVisible()) {
1585                 QTabWidget::paintEvent(event);
1586         } else {
1587                 // Prevent the selected tab to influence the
1588                 // painting of the frame of the tab widget.
1589                 // This is needed for gtk style in Qt.
1590                 QStylePainter p(this);
1591 #if QT_VERSION < 0x050000
1592                 QStyleOptionTabWidgetFrameV2 opt;
1593 #else
1594                 QStyleOptionTabWidgetFrame opt;
1595 #endif
1596                 initStyleOption(&opt);
1597                 opt.rect = style()->subElementRect(QStyle::SE_TabWidgetTabPane,
1598                         &opt, this);
1599                 opt.selectedTabRect = QRect();
1600                 p.drawPrimitive(QStyle::PE_FrameTabWidget, opt);
1601         }
1602 }
1603
1604
1605 void TabWorkArea::mouseDoubleClickEvent(QMouseEvent * event)
1606 {
1607         if (event->button() != Qt::LeftButton)
1608                 return;
1609
1610         // return early if double click on existing tabs
1611         for (int i = 0; i < count(); ++i)
1612                 if (tabBar()->tabRect(i).contains(event->pos()))
1613                         return;
1614
1615         dispatch(FuncRequest(LFUN_BUFFER_NEW));
1616 }
1617
1618
1619 void TabWorkArea::setFullScreen(bool full_screen)
1620 {
1621         for (int i = 0; i != count(); ++i) {
1622                 if (GuiWorkArea * wa = workArea(i))
1623                         wa->setFullScreen(full_screen);
1624         }
1625
1626         if (lyxrc.full_screen_tabbar)
1627                 showBar(!full_screen && count() > 1);
1628         else
1629                 showBar(count() > 1);
1630 }
1631
1632
1633 void TabWorkArea::showBar(bool show)
1634 {
1635         tabBar()->setEnabled(show);
1636         tabBar()->setVisible(show);
1637         closeBufferButton->setVisible(show && lyxrc.single_close_tab_button);
1638         setTabsClosable(!lyxrc.single_close_tab_button);
1639 }
1640
1641
1642 GuiWorkArea * TabWorkArea::currentWorkArea()
1643 {
1644         if (count() == 0)
1645                 return 0;
1646
1647         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(currentWidget());
1648         LATTEST(wa);
1649         return wa;
1650 }
1651
1652
1653 GuiWorkArea * TabWorkArea::workArea(int index)
1654 {
1655         return dynamic_cast<GuiWorkArea *>(widget(index));
1656 }
1657
1658
1659 GuiWorkArea * TabWorkArea::workArea(Buffer & buffer)
1660 {
1661         // FIXME: this method doesn't work if we have more than work area
1662         // showing the same buffer.
1663         for (int i = 0; i != count(); ++i) {
1664                 GuiWorkArea * wa = workArea(i);
1665                 LASSERT(wa, return 0);
1666                 if (&wa->bufferView().buffer() == &buffer)
1667                         return wa;
1668         }
1669         return 0;
1670 }
1671
1672
1673 void TabWorkArea::closeAll()
1674 {
1675         while (count()) {
1676                 GuiWorkArea * wa = workArea(0);
1677                 LASSERT(wa, return);
1678                 removeTab(0);
1679                 delete wa;
1680         }
1681 }
1682
1683
1684 bool TabWorkArea::setCurrentWorkArea(GuiWorkArea * work_area)
1685 {
1686         LASSERT(work_area, return false);
1687         int index = indexOf(work_area);
1688         if (index == -1)
1689                 return false;
1690
1691         if (index == currentIndex())
1692                 // Make sure the work area is up to date.
1693                 on_currentTabChanged(index);
1694         else
1695                 // Switch to the work area.
1696                 setCurrentIndex(index);
1697         work_area->setFocus();
1698
1699         return true;
1700 }
1701
1702
1703 GuiWorkArea * TabWorkArea::addWorkArea(Buffer & buffer, GuiView & view)
1704 {
1705         GuiWorkArea * wa = new GuiWorkArea(buffer, view);
1706         wa->setUpdatesEnabled(false);
1707         // Hide tabbar if there's no tab (avoid a resize and a flashing tabbar
1708         // when hiding it again below).
1709         if (!(currentWorkArea() && currentWorkArea()->isFullScreen()))
1710                 showBar(count() > 0);
1711         addTab(wa, wa->windowTitle());
1712         QObject::connect(wa, SIGNAL(titleChanged(GuiWorkArea *)),
1713                 this, SLOT(updateTabTexts()));
1714         if (currentWorkArea() && currentWorkArea()->isFullScreen())
1715                 setFullScreen(true);
1716         else
1717                 // Hide tabbar if there's only one tab.
1718                 showBar(count() > 1);
1719
1720         updateTabTexts();
1721
1722         return wa;
1723 }
1724
1725
1726 bool TabWorkArea::removeWorkArea(GuiWorkArea * work_area)
1727 {
1728         LASSERT(work_area, return false);
1729         int index = indexOf(work_area);
1730         if (index == -1)
1731                 return false;
1732
1733         work_area->setUpdatesEnabled(false);
1734         removeTab(index);
1735         delete work_area;
1736
1737         if (count()) {
1738                 // make sure the next work area is enabled.
1739                 currentWidget()->setUpdatesEnabled(true);
1740                 if (currentWorkArea() && currentWorkArea()->isFullScreen())
1741                         setFullScreen(true);
1742                 else
1743                         // Show tabbar only if there's more than one tab.
1744                         showBar(count() > 1);
1745         } else
1746                 lastWorkAreaRemoved();
1747
1748         updateTabTexts();
1749
1750         return true;
1751 }
1752
1753
1754 void TabWorkArea::on_currentTabChanged(int i)
1755 {
1756         // returns e.g. on application destruction
1757         if (i == -1)
1758                 return;
1759         GuiWorkArea * wa = workArea(i);
1760         LASSERT(wa, return);
1761         wa->setUpdatesEnabled(true);
1762         wa->redraw(true);
1763         wa->setFocus();
1764         ///
1765         currentWorkAreaChanged(wa);
1766
1767         LYXERR(Debug::GUI, "currentTabChanged " << i
1768                 << " File: " << wa->bufferView().buffer().absFileName());
1769 }
1770
1771
1772 void TabWorkArea::closeCurrentBuffer()
1773 {
1774         GuiWorkArea * wa;
1775         if (clicked_tab_ == -1)
1776                 wa = currentWorkArea();
1777         else {
1778                 wa = workArea(clicked_tab_);
1779                 LASSERT(wa, return);
1780         }
1781         wa->view().closeWorkArea(wa);
1782 }
1783
1784
1785 void TabWorkArea::hideCurrentTab()
1786 {
1787         GuiWorkArea * wa;
1788         if (clicked_tab_ == -1)
1789                 wa = currentWorkArea();
1790         else {
1791                 wa = workArea(clicked_tab_);
1792                 LASSERT(wa, return);
1793         }
1794         wa->view().hideWorkArea(wa);
1795 }
1796
1797
1798 void TabWorkArea::closeTab(int index)
1799 {
1800         on_currentTabChanged(index);
1801         GuiWorkArea * wa;
1802         if (index == -1)
1803                 wa = currentWorkArea();
1804         else {
1805                 wa = workArea(index);
1806                 LASSERT(wa, return);
1807         }
1808         wa->view().closeWorkArea(wa);
1809 }
1810
1811
1812 ///
1813 class DisplayPath {
1814 public:
1815         /// make vector happy
1816         // coverity[UNINIT_CTOR]
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_ += ellipsisSlash_;
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 ? ellipsisSlash_ : "") + filename_;
1861         }
1862         ///
1863         QString forecastPathString() const
1864         {
1865                 if (postfix_.count() == 0)
1866                         return displayString();
1867
1868                 return prefix_
1869                         + (dottedPrefix_ ? ellipsisSlash_ : "")
1870                         + postfix_.front() + "/";
1871         }
1872         ///
1873         bool final() const { return postfix_.empty(); }
1874         ///
1875         int tab() const { return tab_; }
1876
1877 private:
1878         /// ".../"
1879         static QString const ellipsisSlash_;
1880         ///
1881         QString prefix_;
1882         ///
1883         QStringList postfix_;
1884         ///
1885         QString filename_;
1886         ///
1887         QString abs_;
1888         ///
1889         int tab_;
1890         ///
1891         bool dottedPrefix_;
1892 };
1893
1894
1895 QString const DisplayPath::ellipsisSlash_ = QString(QChar(0x2026)) + "/";
1896
1897
1898 ///
1899 bool operator<(DisplayPath const & a, DisplayPath const & b)
1900 {
1901         return a.displayString() < b.displayString();
1902 }
1903
1904 ///
1905 bool operator==(DisplayPath const & a, DisplayPath const & b)
1906 {
1907         return a.displayString() == b.displayString();
1908 }
1909
1910
1911 void TabWorkArea::updateTabTexts()
1912 {
1913         size_t n = count();
1914         if (n == 0)
1915                 return;
1916         std::list<DisplayPath> paths;
1917         typedef std::list<DisplayPath>::iterator It;
1918
1919         // collect full names first: path into postfix, empty prefix and
1920         // filename without extension
1921         for (size_t i = 0; i < n; ++i) {
1922                 GuiWorkArea * i_wa = workArea(i);
1923                 FileName const fn = i_wa->bufferView().buffer().fileName();
1924                 paths.push_back(DisplayPath(i, fn));
1925         }
1926
1927         // go through path segments and see if it helps to make the path more unique
1928         bool somethingChanged = true;
1929         bool allFinal = false;
1930         while (somethingChanged && !allFinal) {
1931                 // adding path segments changes order
1932                 paths.sort();
1933
1934                 LYXERR(Debug::GUI, "updateTabTexts() iteration start");
1935                 somethingChanged = false;
1936                 allFinal = true;
1937
1938                 // find segments which are not unique (i.e. non-atomic)
1939                 It it = paths.begin();
1940                 It segStart = it;
1941                 QString segString = it->displayString();
1942                 for (; it != paths.end(); ++it) {
1943                         // look to the next item
1944                         It next = it;
1945                         ++next;
1946
1947                         // final?
1948                         allFinal = allFinal && it->final();
1949
1950                         LYXERR(Debug::GUI, "it = " << it->abs()
1951                                << " => " << it->displayString());
1952
1953                         // still the same segment?
1954                         QString nextString;
1955                         if ((next != paths.end()
1956                              && (nextString = next->displayString()) == segString))
1957                                 continue;
1958                         LYXERR(Debug::GUI, "segment ended");
1959
1960                         // only a trivial one with one element?
1961                         if (it == segStart) {
1962                                 // start new segment
1963                                 segStart = next;
1964                                 segString = nextString;
1965                                 continue;
1966                         }
1967
1968                         // we found a non-atomic segment segStart <= sit <= it < next.
1969                         // Shift path segments and hope for the best
1970                         // that it makes the path more unique.
1971                         somethingChanged = true;
1972                         It sit = segStart;
1973                         // this is ok for the reason mentioned  in the previous comment.
1974                         // coverity[INVALIDATE_ITERATOR]
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                 QString tab_tooltip = it->abs();
2014                 if (buf.isReadonly()) {
2015                         setTabIcon(tab_index, QIcon(getPixmap("images/", "emblem-readonly", "svgz,png")));
2016                         tab_tooltip = qt_("%1 (read only)").arg(it->abs());
2017                 } else
2018                         setTabIcon(tab_index, QIcon());
2019                 setTabText(tab_index, tab_text);
2020                 setTabToolTip(tab_index, tab_tooltip);
2021         }
2022 }
2023
2024
2025 void TabWorkArea::showContextMenu(const QPoint & pos)
2026 {
2027         // which tab?
2028         clicked_tab_ = static_cast<DragTabBar *>(tabBar())->tabAt(pos);
2029         if (clicked_tab_ == -1)
2030                 return;
2031
2032         // show tab popup
2033         QMenu popup;
2034         popup.addAction(QIcon(getPixmap("images/", "hidetab", "svgz,png")),
2035                 qt_("Hide tab"), this, SLOT(hideCurrentTab()));
2036         popup.addAction(QIcon(getPixmap("images/", "closetab", "svgz,png")),
2037                 qt_("Close tab"), this, SLOT(closeCurrentBuffer()));
2038         popup.exec(tabBar()->mapToGlobal(pos));
2039
2040         clicked_tab_ = -1;
2041 }
2042
2043
2044 void TabWorkArea::moveTab(int fromIndex, int toIndex)
2045 {
2046         QWidget * w = widget(fromIndex);
2047         QIcon icon = tabIcon(fromIndex);
2048         QString text = tabText(fromIndex);
2049
2050         setCurrentIndex(fromIndex);
2051         removeTab(fromIndex);
2052         insertTab(toIndex, w, icon, text);
2053         setCurrentIndex(toIndex);
2054 }
2055
2056
2057 DragTabBar::DragTabBar(QWidget* parent)
2058         : QTabBar(parent)
2059 {
2060         setAcceptDrops(true);
2061         setTabsClosable(!lyxrc.single_close_tab_button);
2062 }
2063
2064
2065 void DragTabBar::mousePressEvent(QMouseEvent * event)
2066 {
2067         if (event->button() == Qt::LeftButton)
2068                 dragStartPos_ = event->pos();
2069         QTabBar::mousePressEvent(event);
2070 }
2071
2072
2073 void DragTabBar::mouseMoveEvent(QMouseEvent * event)
2074 {
2075         // If the left button isn't pressed anymore then return
2076         if (!(event->buttons() & Qt::LeftButton))
2077                 return;
2078
2079         // If the distance is too small then return
2080         if ((event->pos() - dragStartPos_).manhattanLength()
2081             < QApplication::startDragDistance())
2082                 return;
2083
2084         // did we hit something after all?
2085         int tab = tabAt(dragStartPos_);
2086         if (tab == -1)
2087                 return;
2088
2089         // simulate button release to remove highlight from button
2090         int i = currentIndex();
2091         QMouseEvent me(QEvent::MouseButtonRelease, dragStartPos_,
2092                 event->button(), event->buttons(), 0);
2093         QTabBar::mouseReleaseEvent(&me);
2094         setCurrentIndex(i);
2095
2096         // initiate Drag
2097         QDrag * drag = new QDrag(this);
2098         QMimeData * mimeData = new QMimeData;
2099         // a crude way to distinguish tab-reodering drops from other ones
2100         mimeData->setData("action", "tab-reordering") ;
2101         drag->setMimeData(mimeData);
2102
2103         // get tab pixmap as cursor
2104         QRect r = tabRect(tab);
2105         QPixmap pixmap(r.size());
2106         render(&pixmap, - r.topLeft());
2107         drag->setPixmap(pixmap);
2108         drag->exec();
2109 }
2110
2111
2112 void DragTabBar::dragEnterEvent(QDragEnterEvent * event)
2113 {
2114         // Only accept if it's an tab-reordering request
2115         QMimeData const * m = event->mimeData();
2116         QStringList formats = m->formats();
2117         if (formats.contains("action")
2118             && m->data("action") == "tab-reordering")
2119                 event->acceptProposedAction();
2120 }
2121
2122
2123 void DragTabBar::dropEvent(QDropEvent * event)
2124 {
2125         int fromIndex = tabAt(dragStartPos_);
2126         int toIndex = tabAt(event->pos());
2127
2128         // Tell interested objects that
2129         if (fromIndex != toIndex)
2130                 tabMoveRequested(fromIndex, toIndex);
2131         event->acceptProposedAction();
2132 }
2133
2134
2135 } // namespace frontend
2136 } // namespace lyx
2137
2138 #include "moc_GuiWorkArea.cpp"