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 #include <iostream>
  85
  86 int const TabIndicatorWidth = 3;
  87
  88 #undef KeyPress
  89 #undef NoModifier
  90
  91 using namespace std;
  92 using namespace lyx::support;
  93
  94 namespace lyx {
  95
  96
  97 /// return the LyX mouse button state from Qt's
  98 static mouse_button::state q_button_state(Qt::MouseButton button)
  99 {
 100         mouse_button::state b = mouse_button::none;
 101         switch (button) {
 102                 case Qt::LeftButton:
 103                         b = mouse_button::button1;
 104                         break;
 105                 case Qt::MidButton:
 106                         b = mouse_button::button2;
 107                         break;
 108                 case Qt::RightButton:
 109                         b = mouse_button::button3;
 110                         break;
 111                 default:
 112                         break;
 113         }
 114         return b;
 115 }
 116
 117
 118 /// return the LyX mouse button state from Qt's
 119 mouse_button::state q_motion_state(Qt::MouseButtons state)
 120 {
 121         mouse_button::state b = mouse_button::none;
 122         if (state & Qt::LeftButton)
 123                 b |= mouse_button::button1;
 124         if (state & Qt::MidButton)
 125                 b |= mouse_button::button2;
 126         if (state & Qt::RightButton)
 127                 b |= mouse_button::button3;
 128         return b;
 129 }
 130
 131
 132 namespace frontend {
 133
 134 class CursorWidget {
 135 public:
 136         CursorWidget() : rtl_(false), l_shape_(false), completable_(false),
 137                 show_(false), x_(0), cursor_width_(0)
 138         {
 139                 recomputeWidth();
 140         }
 141
 142         void draw(QPainter & painter)
 143         {
 144                 if (!show_ || !rect_.isValid())
 145                         return;
 146
 147                 int y = rect_.top();
 148                 int l = x_ - rect_.left();
 149                 int r = rect_.right() - x_;
 150                 int bot = rect_.bottom();
 151
 152                 // draw vertical line
 153                 painter.fillRect(x_, y, cursor_width_, rect_.height(), color_);
 154
 155                 // draw RTL/LTR indication
 156                 painter.setPen(color_);
 157                 if (l_shape_) {
 158                         if (rtl_)
 159                                 painter.drawLine(x_, bot, x_ - l, bot);
 160                         else
 161                                 painter.drawLine(x_, bot, x_ + cursor_width_ + r, bot);
 162                 }
 163
 164                 // draw completion triangle
 165                 if (completable_) {
 166                         int m = y + rect_.height() / 2;
 167                         int d = TabIndicatorWidth - 1;
 168                         if (rtl_) {
 169                                 painter.drawLine(x_ - 1, m - d, x_ - 1 - d, m);
 170                                 painter.drawLine(x_ - 1, m + d, x_ - 1 - d, m);
 171                         } else {
 172                                 painter.drawLine(x_ + cursor_width_, m - d, x_ + cursor_width_ + d, m);
 173                                 painter.drawLine(x_ + cursor_width_, m + d, x_ + cursor_width_ + d, m);
 174                         }
 175                 }
 176         }
 177
 178         void update(int x, int y, int h, bool l_shape,
 179                 bool rtl, bool completable)
 180         {
 181                 color_ = guiApp->colorCache().get(Color_cursor);
 182                 l_shape_ = l_shape;
 183                 rtl_ = rtl;
 184                 completable_ = completable;
 185                 x_ = x;
 186
 187                 // extension to left and right
 188                 int l = 0;
 189                 int r = 0;
 190
 191                 // RTL/LTR indication
 192                 if (l_shape_) {
 193                         if (rtl)
 194                                 l += h / 3;
 195                         else
 196                                 r += h / 3;
 197                 }
 198
 199                 // completion triangle
 200                 if (completable_) {
 201                         if (rtl)
 202                                 l = max(l, TabIndicatorWidth);
 203                         else
 204                                 r = max(r, TabIndicatorWidth);
 205                 }
 206
 207                 // compute overall rectangle
 208                 rect_ = QRect(x - l, y, cursor_width_ + r + l, h);
 209         }
 210
 211         void show(bool set_show = true) { show_ = set_show; }
 212         void hide() { show_ = false; }
 213         int cursorWidth() const { return cursor_width_; }
 214         void recomputeWidth() {
 215                 cursor_width_ = lyxrc.cursor_width
 216                         ? lyxrc.cursor_width
 217                         : 1 + int((lyxrc.zoom + 50) / 200.0);
 218         }
 219
 220         QRect const & rect() { return rect_; }
 221
 222 private:
 223         /// cursor is in RTL or LTR text
 224         bool rtl_;
 225         /// indication for RTL or LTR
 226         bool l_shape_;
 227         /// triangle to show that a completion is available
 228         bool completable_;
 229         ///
 230         bool show_;
 231         ///
 232         QColor color_;
 233         /// rectangle, possibly with l_shape and completion triangle
 234         QRect rect_;
 235         /// x position (were the vertical line is drawn)
 236         int x_;
 237
 238         int cursor_width_;
 239 };
 240
 241
 242 // This is a 'heartbeat' generating synthetic mouse move events when the
 243 // cursor is at the top or bottom edge of the viewport. One scroll per 0.2 s
 244 SyntheticMouseEvent::SyntheticMouseEvent()
 245         : timeout(200), restart_timeout(true)
 246 {}
 247
 248
 249 GuiWorkArea::Private::Private(GuiWorkArea * parent)
 250 : p(parent), screen_(0), buffer_view_(0), read_only_(false), lyx_view_(0),
 251 cursor_visible_(false), cursor_(0),
 252 need_resize_(false), schedule_redraw_(false), preedit_lines_(1),
 253 pixel_ratio_(1.0),
 254 completer_(new GuiCompleter(p, p)), dialog_mode_(false)
 255 {
 256 }
 257
 258
 259 GuiWorkArea::GuiWorkArea(QWidget * /* w */)
 260 : d(new Private(this))
 261 {
 262 }
 263
 264
 265 GuiWorkArea::GuiWorkArea(Buffer & buffer, GuiView & gv)
 266 : d(new Private(this))
 267 {
 268         setGuiView(gv);
 269         buffer.params().display_pixel_ratio = theGuiApp()->pixelRatio();
 270         setBuffer(buffer);
 271         init();
 272 }
 273
 274
 275 double GuiWorkArea::pixelRatio() const
 276 {
 277 #if QT_VERSION >= 0x050000
 278         return devicePixelRatio();
 279 #else
 280         return 1.0;
 281 #endif
 282 }
 283
 284
 285 void GuiWorkArea::init()
 286 {
 287         // Setup the signals
 288         connect(&d->cursor_timeout_, SIGNAL(timeout()),
 289                 this, SLOT(toggleCursor()));
 290
 291         int const time = QApplication::cursorFlashTime() / 2;
 292         if (time > 0) {
 293                 d->cursor_timeout_.setInterval(time);
 294                 d->cursor_timeout_.start();
 295         } else {
 296                 // let's initialize this just to be safe
 297                 d->cursor_timeout_.setInterval(500);
 298         }
 299
 300         d->resetScreen();
 301         // With Qt4.5 a mouse event will happen before the first paint event
 302         // so make sure that the buffer view has an up to date metrics.
 303         d->buffer_view_->resize(viewport()->width(), viewport()->height());
 304         d->cursor_ = new frontend::CursorWidget();
 305         d->cursor_->hide();
 306
 307         setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 308         setAcceptDrops(true);
 309         setMouseTracking(true);
 310         setMinimumSize(100, 70);
 311         setFrameStyle(QFrame::NoFrame);
 312         updateWindowTitle();
 313
 314         viewport()->setAutoFillBackground(false);
 315         // We don't need double-buffering nor SystemBackground on
 316         // the viewport because we have our own backing pixmap.
 317         viewport()->setAttribute(Qt::WA_NoSystemBackground);
 318
 319         setFocusPolicy(Qt::StrongFocus);
 320
 321         d->setCursorShape(Qt::IBeamCursor);
 322
 323         d->synthetic_mouse_event_.timeout.timeout.connect(
 324                 bind(&GuiWorkArea::generateSyntheticMouseEvent,
 325                                         this));
 326
 327         // Initialize the vertical Scroll Bar
 328         QObject::connect(verticalScrollBar(), SIGNAL(valueChanged(int)),
 329                 this, SLOT(scrollTo(int)));
 330
 331         LYXERR(Debug::GUI, "viewport width: " << viewport()->width()
 332                 << "  viewport height: " << viewport()->height());
 333
 334         // Enables input methods for asian languages.
 335         // Must be set when creating custom text editing widgets.
 336         setAttribute(Qt::WA_InputMethodEnabled, true);
 337
 338         d->dialog_mode_ = false;
 339 }
 340
 341
 342 GuiWorkArea::~GuiWorkArea()
 343 {
 344         d->buffer_view_->buffer().workAreaManager().remove(this);
 345         delete d->screen_;
 346         delete d->buffer_view_;
 347         delete d->cursor_;
 348         // Completer has a QObject parent and is thus automatically destroyed.
 349         // See #4758.
 350         // delete completer_;
 351         delete d;
 352 }
 353
 354
 355 Qt::CursorShape GuiWorkArea::cursorShape() const
 356 {
 357         return viewport()->cursor().shape();
 358 }
 359
 360
 361 void GuiWorkArea::Private::setCursorShape(Qt::CursorShape shape)
 362 {
 363         p->viewport()->setCursor(shape);
 364 }
 365
 366
 367 void GuiWorkArea::Private::updateCursorShape()
 368 {
 369         setCursorShape(buffer_view_->clickableInset()
 370                 ? Qt::PointingHandCursor : Qt::IBeamCursor);
 371 }
 372
 373
 374 void GuiWorkArea::setGuiView(GuiView & gv)
 375 {
 376         d->lyx_view_ = &gv;
 377 }
 378
 379
 380 void GuiWorkArea::setBuffer(Buffer & buffer)
 381 {
 382         delete d->buffer_view_;
 383         d->buffer_view_ = new BufferView(buffer);
 384         buffer.workAreaManager().add(this);
 385
 386         // HACK: Prevents an additional redraw when the scrollbar pops up
 387         // which regularily happens on documents with more than one page.
 388         // The policy  should be set to "Qt::ScrollBarAsNeeded" soon.
 389         // Since we have no geometry information yet, we assume that
 390         // a document needs a scrollbar if there is more then four
 391         // paragraph in the outermost text.
 392         if (buffer.text().paragraphs().size() > 4)
 393                 setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
 394         QTimer::singleShot(50, this, SLOT(fixVerticalScrollBar()));
 395 }
 396
 397
 398 void GuiWorkArea::fixVerticalScrollBar()
 399 {
 400         if (!isFullScreen())
 401                 setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
 402 }
 403
 404
 405 void GuiWorkArea::close()
 406 {
 407         d->lyx_view_->removeWorkArea(this);
 408 }
 409
 410
 411 void GuiWorkArea::setFullScreen(bool full_screen)
 412 {
 413         d->buffer_view_->setFullScreen(full_screen);
 414         setFrameStyle(QFrame::NoFrame);
 415         if (full_screen) {
 416                 setFrameStyle(QFrame::NoFrame);
 417                 if (lyxrc.full_screen_scrollbar)
 418                         setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 419         } else
 420                 setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
 421 }
 422
 423
 424 BufferView & GuiWorkArea::bufferView()
 425 {
 426         return *d->buffer_view_;
 427 }
 428
 429
 430 BufferView const & GuiWorkArea::bufferView() const
 431 {
 432         return *d->buffer_view_;
 433 }
 434
 435
 436 void GuiWorkArea::stopBlinkingCursor()
 437 {
 438         d->cursor_timeout_.stop();
 439         d->hideCursor();
 440 }
 441
 442
 443 void GuiWorkArea::startBlinkingCursor()
 444 {
 445         // do not show the cursor if the view is busy
 446         if (view().busy())
 447                 return;
 448
 449         Point p;
 450         int h = 0;
 451         d->buffer_view_->cursorPosAndHeight(p, h);
 452         // Don't start blinking if the cursor isn't on screen.
 453         if (!d->buffer_view_->cursorInView(p, h))
 454                 return;
 455
 456         d->showCursor();
 457
 458         //we're not supposed to cache this value.
 459         int const time = QApplication::cursorFlashTime() / 2;
 460         if (time <= 0)
 461                 return;
 462         d->cursor_timeout_.setInterval(time);
 463         d->cursor_timeout_.start();
 464 }
 465
 466
 467 void GuiWorkArea::redraw(bool update_metrics)
 468 {
 469         if (!isVisible())
 470                 // No need to redraw in this case.
 471                 return;
 472
 473         // No need to do anything if this is the current view. The BufferView
 474         // metrics are already up to date.
 475         if (update_metrics || d->lyx_view_ != guiApp->currentView()
 476                 || d->lyx_view_->currentWorkArea() != this) {
 477                 // FIXME: it would be nice to optimize for the off-screen case.
 478                 d->buffer_view_->cursor().fixIfBroken();
 479                 d->buffer_view_->updateMetrics();
 480                 d->buffer_view_->cursor().fixIfBroken();
 481         }
 482
 483         // update cursor position, because otherwise it has to wait until
 484         // the blinking interval is over
 485         if (d->cursor_visible_) {
 486                 d->hideCursor();
 487                 d->showCursor();
 488         }
 489
 490         LYXERR(Debug::WORKAREA, "WorkArea::redraw screen");
 491         d->updateScreen();
 492         update(0, 0, viewport()->width(), viewport()->height());
 493
 494         /// \warning: scrollbar updating *must* be done after the BufferView is drawn
 495         /// because \c BufferView::updateScrollbar() is called in \c BufferView::draw().
 496         d->updateScrollbar();
 497         d->lyx_view_->updateStatusBar();
 498
 499         if (lyxerr.debugging(Debug::WORKAREA))
 500                 d->buffer_view_->coordCache().dump();
 501
 502         updateWindowTitle();
 503
 504         d->updateCursorShape();
 505 }
 506
 507
 508 // Keep in sync with GuiWorkArea::processKeySym below
 509 bool GuiWorkArea::queryKeySym(KeySymbol const & key, KeyModifier mod) const
 510 {
 511         return guiApp->queryKeySym(key, mod);
 512 }
 513
 514
 515 // Keep in sync with GuiWorkArea::queryKeySym above
 516 void GuiWorkArea::processKeySym(KeySymbol const & key, KeyModifier mod)
 517 {
 518         if (d->lyx_view_->isFullScreen() && d->lyx_view_->menuBar()->isVisible()
 519                 && lyxrc.full_screen_menubar) {
 520                 // FIXME HACK: we should not have to do this here. See related comment
 521                 // in GuiView::event() (QEvent::ShortcutOverride)
 522                 d->lyx_view_->menuBar()->hide();
 523         }
 524
 525         // In order to avoid bad surprise in the middle of an operation,
 526         // we better stop the blinking cursor...
 527         // the cursor gets restarted in GuiView::restartCursor()
 528         stopBlinkingCursor();
 529         guiApp->processKeySym(key, mod);
 530 }
 531
 532
 533 void GuiWorkArea::Private::dispatch(FuncRequest const & cmd)
 534 {
 535         // Handle drag&drop
 536         if (cmd.action() == LFUN_FILE_OPEN) {
 537                 DispatchResult dr;
 538                 lyx_view_->dispatch(cmd, dr);
 539                 return;
 540         }
 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
 643         //int cur_x = buffer_view_->getPos(cur).x_;
 644         // We may have decided to slide the cursor row so that cursor
 645         // is visible.
 646         p.x_ -= buffer_view_->horizScrollOffset();
 647
 648         showCursor(p.x_, p.y_, h, l_shape, isrtl, completable);
 649 }
 650
 651
 652 void GuiWorkArea::Private::hideCursor()
 653 {
 654         if (!cursor_visible_)
 655                 return;
 656
 657         cursor_visible_ = false;
 658         removeCursor();
 659 }
 660
 661
 662 void GuiWorkArea::toggleCursor()
 663 {
 664         if (d->cursor_visible_)
 665                 d->hideCursor();
 666         else
 667                 d->showCursor();
 668 }
 669
 670
 671 void GuiWorkArea::Private::updateScrollbar()
 672 {
 673         ScrollbarParameters const & scroll_ = buffer_view_->scrollbarParameters();
 674         // Block signals to prevent setRange() and setSliderPosition from causing
 675         // recursive calls via the signal valueChanged. (#10311)
 676         QSignalBlocker blocker(p->verticalScrollBar());
 677         p->verticalScrollBar()->setRange(scroll_.min, scroll_.max);
 678         p->verticalScrollBar()->setPageStep(scroll_.page_step);
 679         p->verticalScrollBar()->setSingleStep(scroll_.single_step);
 680         p->verticalScrollBar()->setSliderPosition(0);
 681 }
 682
 683
 684 void GuiWorkArea::scrollTo(int value)
 685 {
 686         stopBlinkingCursor();
 687         d->buffer_view_->scrollDocView(value, true);
 688
 689         if (lyxrc.cursor_follows_scrollbar) {
 690                 d->buffer_view_->setCursorFromScrollbar();
 691                 // FIXME: let GuiView take care of those.
 692                 d->lyx_view_->updateLayoutList();
 693         }
 694         // Show the cursor immediately after any operation.
 695         startBlinkingCursor();
 696         // FIXME QT5
 697 #ifdef Q_WS_X11
 698         QApplication::syncX();
 699 #endif
 700 }
 701
 702
 703 bool GuiWorkArea::event(QEvent * e)
 704 {
 705         switch (e->type()) {
 706         case QEvent::ToolTip: {
 707                 QHelpEvent * helpEvent = static_cast<QHelpEvent *>(e);
 708                 if (lyxrc.use_tooltip) {
 709                         QPoint pos = helpEvent->pos();
 710                         if (pos.x() < viewport()->width()) {
 711                                 QString s = toqstr(d->buffer_view_->toolTip(pos.x(), pos.y()));
 712                                 QToolTip::showText(helpEvent->globalPos(), formatToolTip(s,35));
 713                         }
 714                         else
 715                                 QToolTip::hideText();
 716                 }
 717                 // Don't forget to accept the event!
 718                 e->accept();
 719                 return true;
 720         }
 721
 722         case QEvent::ShortcutOverride:
 723                 // keyPressEvent is ShortcutOverride-aware and only accepts the event in
 724                 // this case
 725                 keyPressEvent(static_cast<QKeyEvent *>(e));
 726                 return e->isAccepted();
 727
 728         case QEvent::KeyPress: {
 729                 // We catch this event in order to catch the Tab or Shift+Tab key press
 730                 // which are otherwise reserved to focus switching between controls
 731                 // within a dialog.
 732                 QKeyEvent * ke = static_cast<QKeyEvent*>(e);
 733                 if ((ke->key() == Qt::Key_Tab && ke->modifiers() == Qt::NoModifier)
 734                         || (ke->key() == Qt::Key_Backtab && (
 735                                 ke->modifiers() == Qt::ShiftModifier
 736                                 || ke->modifiers() == Qt::NoModifier))) {
 737                         keyPressEvent(ke);
 738                         return true;
 739                 }
 740                 return QAbstractScrollArea::event(e);
 741         }
 742
 743         default:
 744                 return QAbstractScrollArea::event(e);
 745         }
 746         return false;
 747 }
 748
 749
 750 void GuiWorkArea::contextMenuEvent(QContextMenuEvent * e)
 751 {
 752         string name;
 753         if (e->reason() == QContextMenuEvent::Mouse)
 754                 // the menu name is set on mouse press
 755                 name = d->context_menu_name_;
 756         else {
 757                 QPoint pos = e->pos();
 758                 Cursor const & cur = d->buffer_view_->cursor();
 759                 if (e->reason() == QContextMenuEvent::Keyboard && cur.inTexted()) {
 760                         // Do not access the context menu of math right in front of before
 761                         // the cursor. This does not work when the cursor is in text.
 762                         Inset * inset = cur.paragraph().getInset(cur.pos());
 763                         if (inset && inset->asInsetMath())
 764                                 --pos.rx();
 765                         else if (cur.pos() > 0) {
 766                                 Inset * inset = cur.paragraph().getInset(cur.pos() - 1);
 767                                 if (inset)
 768                                         ++pos.rx();
 769                         }
 770                 }
 771                 name = d->buffer_view_->contextMenu(pos.x(), pos.y());
 772         }
 773
 774         if (name.empty()) {
 775                 QAbstractScrollArea::contextMenuEvent(e);
 776                 return;
 777         }
 778         // always show mnemonics when the keyboard is used to show the context menu
 779         // FIXME: This should be fixed in Qt itself
 780         bool const keyboard = (e->reason() == QContextMenuEvent::Keyboard);
 781         QMenu * menu = guiApp->menus().menu(toqstr(name), *d->lyx_view_, keyboard);
 782         if (!menu) {
 783                 QAbstractScrollArea::contextMenuEvent(e);
 784                 return;
 785         }
 786         // Position the menu to the right.
 787         // FIXME: menu position should be different for RTL text.
 788         menu->exec(e->globalPos());
 789         e->accept();
 790 }
 791
 792
 793 void GuiWorkArea::focusInEvent(QFocusEvent * e)
 794 {
 795         LYXERR(Debug::DEBUG, "GuiWorkArea::focusInEvent(): " << this << endl);
 796         if (d->lyx_view_->currentWorkArea() != this) {
 797                 d->lyx_view_->setCurrentWorkArea(this);
 798                 d->lyx_view_->currentWorkArea()->bufferView().buffer().updateBuffer();
 799         }
 800
 801         startBlinkingCursor();
 802         QAbstractScrollArea::focusInEvent(e);
 803 }
 804
 805
 806 void GuiWorkArea::focusOutEvent(QFocusEvent * e)
 807 {
 808         LYXERR(Debug::DEBUG, "GuiWorkArea::focusOutEvent(): " << this << endl);
 809         stopBlinkingCursor();
 810         QAbstractScrollArea::focusOutEvent(e);
 811 }
 812
 813
 814 void GuiWorkArea::mousePressEvent(QMouseEvent * e)
 815 {
 816         if (d->dc_event_.active && d->dc_event_ == *e) {
 817                 d->dc_event_.active = false;
 818                 FuncRequest cmd(LFUN_MOUSE_TRIPLE, e->x(), e->y(),
 819                         q_button_state(e->button()), q_key_state(e->modifiers()));
 820                 d->dispatch(cmd);
 821                 e->accept();
 822                 return;
 823         }
 824
 825 #if (QT_VERSION < 0x050000) && !defined(__HAIKU__)
 826         inputContext()->reset();
 827 #endif
 828
 829         FuncRequest const cmd(LFUN_MOUSE_PRESS, e->x(), e->y(),
 830                         q_button_state(e->button()), q_key_state(e->modifiers()));
 831         d->dispatch(cmd);
 832
 833         // Save the context menu on mouse press, because also the mouse
 834         // cursor is set on mouse press. Afterwards, we can either release
 835         // the mousebutton somewhere else, or the cursor might have moved
 836         // due to the DEPM. We need to do this after the mouse has been
 837         // set in dispatch(), because the selection state might change.
 838         if (e->button() == Qt::RightButton)
 839                 d->context_menu_name_ = d->buffer_view_->contextMenu(e->x(), e->y());
 840
 841         e->accept();
 842 }
 843
 844
 845 void GuiWorkArea::mouseReleaseEvent(QMouseEvent * e)
 846 {
 847         if (d->synthetic_mouse_event_.timeout.running())
 848                 d->synthetic_mouse_event_.timeout.stop();
 849
 850         FuncRequest const cmd(LFUN_MOUSE_RELEASE, e->x(), e->y(),
 851                         q_button_state(e->button()), q_key_state(e->modifiers()));
 852         d->dispatch(cmd);
 853         e->accept();
 854 }
 855
 856
 857 void GuiWorkArea::mouseMoveEvent(QMouseEvent * e)
 858 {
 859         // we kill the triple click if we move
 860         doubleClickTimeout();
 861         FuncRequest cmd(LFUN_MOUSE_MOTION, e->x(), e->y(),
 862                         q_motion_state(e->buttons()), q_key_state(e->modifiers()));
 863
 864         e->accept();
 865
 866         // If we're above or below the work area...
 867         if ((e->y() <= 20 || e->y() >= viewport()->height() - 20)
 868                         && e->buttons() == mouse_button::button1) {
 869                 // Make sure only a synthetic event can cause a page scroll,
 870                 // so they come at a steady rate:
 871                 if (e->y() <= 20)
 872                         // _Force_ a scroll up:
 873                         cmd.set_y(e->y() - 21);
 874                 else
 875                         cmd.set_y(e->y() + 21);
 876                 // Store the event, to be handled when the timeout expires.
 877                 d->synthetic_mouse_event_.cmd = cmd;
 878
 879                 if (d->synthetic_mouse_event_.timeout.running()) {
 880                         // Discard the event. Note that it _may_ be handled
 881                         // when the timeout expires if
 882                         // synthetic_mouse_event_.cmd has not been overwritten.
 883                         // Ie, when the timeout expires, we handle the
 884                         // most recent event but discard all others that
 885                         // occurred after the one used to start the timeout
 886                         // in the first place.
 887                         return;
 888                 }
 889
 890                 d->synthetic_mouse_event_.restart_timeout = true;
 891                 d->synthetic_mouse_event_.timeout.start();
 892                 // Fall through to handle this event...
 893
 894         } else if (d->synthetic_mouse_event_.timeout.running()) {
 895                 // Store the event, to be possibly handled when the timeout
 896                 // expires.
 897                 // Once the timeout has expired, normal control is returned
 898                 // to mouseMoveEvent (restart_timeout = false).
 899                 // This results in a much smoother 'feel' when moving the
 900                 // mouse back into the work area.
 901                 d->synthetic_mouse_event_.cmd = cmd;
 902                 d->synthetic_mouse_event_.restart_timeout = false;
 903                 return;
 904         }
 905         d->dispatch(cmd);
 906 }
 907
 908
 909 void GuiWorkArea::wheelEvent(QWheelEvent * ev)
 910 {
 911         // Wheel rotation by one notch results in a delta() of 120 (see
 912         // documentation of QWheelEvent)
 913         double const delta = ev->delta() / 120.0;
 914         bool zoom = false;
 915         switch (lyxrc.scroll_wheel_zoom) {
 916         case LyXRC::SCROLL_WHEEL_ZOOM_CTRL:
 917                 zoom = ev->modifiers() & Qt::ControlModifier;
 918                 zoom &= !(ev->modifiers() & (Qt::ShiftModifier | Qt::AltModifier));
 919                 break;
 920         case LyXRC::SCROLL_WHEEL_ZOOM_SHIFT:
 921                 zoom = ev->modifiers() & Qt::ShiftModifier;
 922                 zoom &= !(ev->modifiers() & (Qt::ControlModifier | Qt::AltModifier));
 923                 break;
 924         case LyXRC::SCROLL_WHEEL_ZOOM_ALT:
 925                 zoom = ev->modifiers() & Qt::AltModifier;
 926                 zoom &= !(ev->modifiers() & (Qt::ShiftModifier | Qt::ControlModifier));
 927                 break;
 928         case LyXRC::SCROLL_WHEEL_ZOOM_OFF:
 929                 break;
 930         }
 931         if (zoom) {
 932                 docstring arg = convert<docstring>(int(5 * delta));
 933                 lyx::dispatch(FuncRequest(LFUN_BUFFER_ZOOM_IN, arg));
 934                 return;
 935         }
 936
 937         // Take into account the desktop wide settings.
 938         int const lines = qApp->wheelScrollLines();
 939         int const page_step = verticalScrollBar()->pageStep();
 940         // Test if the wheel mouse is set to one screen at a time.
 941         // This is according to
 942         // https://doc.qt.io/qt-5/qapplication.html#wheelScrollLines-prop
 943         int scroll_value =
 944                 min(lines * verticalScrollBar()->singleStep(), page_step);
 945
 946         // Take into account the rotation and the user preferences.
 947         scroll_value = int(scroll_value * delta * lyxrc.mouse_wheel_speed);
 948         LYXERR(Debug::SCROLLING, "wheelScrollLines = " << lines
 949                         << " delta = " << delta << " scroll_value = " << scroll_value
 950                         << " page_step = " << page_step);
 951         // Now scroll.
 952         verticalScrollBar()->setValue(verticalScrollBar()->value() - scroll_value);
 953
 954         ev->accept();
 955 }
 956
 957
 958 void GuiWorkArea::generateSyntheticMouseEvent()
 959 {
 960         int const e_y = d->synthetic_mouse_event_.cmd.y();
 961         int const wh = d->buffer_view_->workHeight();
 962         bool const up = e_y < 0;
 963         bool const down = e_y > wh;
 964
 965         // Set things off to generate the _next_ 'pseudo' event.
 966         int step = 50;
 967         if (d->synthetic_mouse_event_.restart_timeout) {
 968                 // This is some magic formulae to determine the speed
 969                 // of scrolling related to the position of the mouse.
 970                 int time = 200;
 971                 if (up || down) {
 972                         int dist = up ? -e_y : e_y - wh;
 973                         time = max(min(200, 250000 / (dist * dist)), 1) ;
 974
 975                         if (time < 40) {
 976                                 step = 80000 / (time * time);
 977                                 time = 40;
 978                         }
 979                 }
 980                 d->synthetic_mouse_event_.timeout.setTimeout(time);
 981                 d->synthetic_mouse_event_.timeout.start();
 982         }
 983
 984         // Can we scroll further ?
 985         int const value = verticalScrollBar()->value();
 986         if (value == verticalScrollBar()->maximum()
 987                   || value == verticalScrollBar()->minimum()) {
 988                 d->synthetic_mouse_event_.timeout.stop();
 989                 return;
 990         }
 991
 992         // Scroll
 993         if (step <= 2 * wh) {
 994                 d->buffer_view_->scroll(up ? -step : step);
 995                 d->buffer_view_->updateMetrics();
 996         } else {
 997                 d->buffer_view_->scrollDocView(value + (up ? -step : step), false);
 998         }
 999
1000         // In which paragraph do we have to set the cursor ?
1001         Cursor & cur = d->buffer_view_->cursor();
1002         // FIXME: we don't know howto handle math.
1003         Text * text = cur.text();
1004         if (!text)
1005                 return;
1006         TextMetrics const & tm = d->buffer_view_->textMetrics(text);
1007
1008         pair<pit_type, const ParagraphMetrics *> pp = up ? tm.first() : tm.last();
1009         ParagraphMetrics const & pm = *pp.second;
1010         pit_type const pit = pp.first;
1011
1012         if (pm.rows().empty())
1013                 return;
1014
1015         // Find the row at which we set the cursor.
1016         RowList::const_iterator rit = pm.rows().begin();
1017         RowList::const_iterator rlast = pm.rows().end();
1018         int yy = pm.position() - pm.ascent();
1019         for (--rlast; rit != rlast; ++rit) {
1020                 int h = rit->height();
1021                 if ((up && yy + h > 0)
1022                           || (!up && yy + h > wh - defaultRowHeight()))
1023                         break;
1024                 yy += h;
1025         }
1026
1027         // Find the position of the cursor
1028         bool bound;
1029         int x = d->synthetic_mouse_event_.cmd.x();
1030         pos_type const pos = tm.getPosNearX(*rit, x, bound);
1031
1032         // Set the cursor
1033         cur.pit() = pit;
1034         cur.pos() = pos;
1035         cur.boundary(bound);
1036
1037         d->buffer_view_->buffer().changed(false);
1038         return;
1039 }
1040
1041
1042 void GuiWorkArea::keyPressEvent(QKeyEvent * ev)
1043 {
1044         // this is also called for ShortcutOverride events. In this case, one must
1045         // not act but simply accept the event explicitly.
1046         bool const act = (ev->type() != QEvent::ShortcutOverride);
1047
1048         // Do not process here some keys if dialog_mode_ is set
1049         if (d->dialog_mode_
1050                 && (ev->modifiers() == Qt::NoModifier
1051                     || ev->modifiers() == Qt::ShiftModifier)
1052                 && (ev->key() == Qt::Key_Escape
1053                     || ev->key() == Qt::Key_Enter
1054                     || ev->key() == Qt::Key_Return)
1055             ) {
1056                 ev->ignore();
1057                 return;
1058         }
1059
1060         // intercept some keys if completion popup is visible
1061         if (d->completer_->popupVisible()) {
1062                 switch (ev->key()) {
1063                 case Qt::Key_Enter:
1064                 case Qt::Key_Return:
1065                         if (act)
1066                                 d->completer_->activate();
1067                         ev->accept();
1068                         return;
1069                 }
1070         }
1071
1072         // do nothing if there are other events
1073         // (the auto repeated events come too fast)
1074         // it looks like this is only needed on X11
1075 #if defined(Q_WS_X11) || defined(QPA_XCB)
1076         // FIXME: this is a weird way to implement event compression. Also, this is
1077         // broken with IBus.
1078         if (act && qApp->hasPendingEvents() && ev->isAutoRepeat()) {
1079                 switch (ev->key()) {
1080                 case Qt::Key_PageDown:
1081                 case Qt::Key_PageUp:
1082                 case Qt::Key_Left:
1083                 case Qt::Key_Right:
1084                 case Qt::Key_Up:
1085                 case Qt::Key_Down:
1086                         LYXERR(Debug::KEY, "system is busy: scroll key event ignored");
1087                         ev->ignore();
1088                         return;
1089                 }
1090         }
1091 #endif
1092
1093         KeyModifier const m = q_key_state(ev->modifiers());
1094
1095         std::string str;
1096         if (m & ShiftModifier)
1097                 str += "Shift-";
1098         if (m & ControlModifier)
1099                 str += "Control-";
1100         if (m & AltModifier)
1101                 str += "Alt-";
1102         if (m & MetaModifier)
1103                 str += "Meta-";
1104
1105         if (act)
1106                 LYXERR(Debug::KEY, " count: " << ev->count() << " text: " << ev->text()
1107                        << " isAutoRepeat: " << ev->isAutoRepeat() << " key: " << ev->key()
1108                        << " keyState: " << str);
1109
1110         KeySymbol sym;
1111         setKeySymbol(&sym, ev);
1112         if (sym.isOK()) {
1113                 if (act) {
1114                         processKeySym(sym, m);
1115                         ev->accept();
1116                 } else
1117                         ev->setAccepted(queryKeySym(sym, m));
1118         } else {
1119                 ev->ignore();
1120         }
1121 }
1122
1123
1124 void GuiWorkArea::doubleClickTimeout()
1125 {
1126         d->dc_event_.active = false;
1127 }
1128
1129
1130 void GuiWorkArea::mouseDoubleClickEvent(QMouseEvent * ev)
1131 {
1132         d->dc_event_ = DoubleClick(ev);
1133         QTimer::singleShot(QApplication::doubleClickInterval(), this,
1134                         SLOT(doubleClickTimeout()));
1135         FuncRequest cmd(LFUN_MOUSE_DOUBLE, ev->x(), ev->y(),
1136                         q_button_state(ev->button()), q_key_state(ev->modifiers()));
1137         d->dispatch(cmd);
1138         ev->accept();
1139 }
1140
1141
1142 void GuiWorkArea::resizeEvent(QResizeEvent * ev)
1143 {
1144         QAbstractScrollArea::resizeEvent(ev);
1145         d->need_resize_ = true;
1146         ev->accept();
1147 }
1148
1149
1150 void GuiWorkArea::Private::update(int x, int y, int w, int h)
1151 {
1152         p->viewport()->update(x, y, w, h);
1153 }
1154
1155
1156 void GuiWorkArea::paintEvent(QPaintEvent * ev)
1157 {
1158         QRectF const rc = ev->rect();
1159         // LYXERR(Debug::PAINTING, "paintEvent begin: x: " << rc.x()
1160         //      << " y: " << rc.y() << " w: " << rc.width() << " h: " << rc.height());
1161
1162         if (d->needResize()) {
1163                 d->resetScreen();
1164                 d->resizeBufferView();
1165                 if (d->cursor_visible_) {
1166                         d->hideCursor();
1167                         d->showCursor();
1168                 }
1169         }
1170
1171         QPainter pain(viewport());
1172         double const pr = pixelRatio();
1173         QRectF const rcs = QRectF(rc.x() * pr, rc.y() * pr, rc.width() * pr, rc.height() * pr);
1174
1175         if (lyxrc.use_qimage) {
1176                 QImage const & image = static_cast<QImage const &>(*d->screen_);
1177                 pain.drawImage(rc, image, rcs);
1178         } else {
1179                 QPixmap const & pixmap = static_cast<QPixmap const &>(*d->screen_);
1180                 pain.drawPixmap(rc, pixmap, rcs);
1181         }
1182         d->cursor_->draw(pain);
1183         ev->accept();
1184 }
1185
1186
1187 void GuiWorkArea::Private::updateScreen()
1188 {
1189         GuiPainter pain(screen_, p->pixelRatio());
1190         buffer_view_->draw(pain);
1191 }
1192
1193
1194 void GuiWorkArea::Private::showCursor(int x, int y, int h,
1195         bool l_shape, bool rtl, bool completable)
1196 {
1197         if (schedule_redraw_) {
1198                 // This happens when a graphic conversion is finished. As we don't know
1199                 // the size of the new graphics, it's better the update everything.
1200                 // We can't use redraw() here because this would trigger a infinite
1201                 // recursive loop with showCursor().
1202                 buffer_view_->resize(p->viewport()->width(), p->viewport()->height());
1203                 updateScreen();
1204                 updateScrollbar();
1205                 p->viewport()->update(QRect(0, 0, p->viewport()->width(), p->viewport()->height()));
1206                 schedule_redraw_ = false;
1207                 // Show the cursor immediately after the update.
1208                 hideCursor();
1209                 p->toggleCursor();
1210                 return;
1211         }
1212
1213         cursor_->update(x, y, h, l_shape, rtl, completable);
1214         cursor_->show();
1215         p->viewport()->update(cursor_->rect());
1216 }
1217
1218
1219 void GuiWorkArea::Private::removeCursor()
1220 {
1221         cursor_->hide();
1222         //if (!qApp->focusWidget())
1223                 p->viewport()->update(cursor_->rect());
1224 }
1225
1226
1227 void GuiWorkArea::inputMethodEvent(QInputMethodEvent * e)
1228 {
1229         QString const & commit_string = e->commitString();
1230         docstring const & preedit_string
1231                 = qstring_to_ucs4(e->preeditString());
1232
1233         if (!commit_string.isEmpty()) {
1234
1235                 LYXERR(Debug::KEY, "preeditString: " << e->preeditString()
1236                         << " commitString: " << e->commitString());
1237
1238                 int key = 0;
1239
1240                 // FIXME Iwami 04/01/07: we should take care also of UTF16 surrogates here.
1241                 for (int i = 0; i != commit_string.size(); ++i) {
1242                         QKeyEvent ev(QEvent::KeyPress, key, Qt::NoModifier, commit_string[i]);
1243                         keyPressEvent(&ev);
1244                 }
1245         }
1246
1247         // Hide the cursor during the kana-kanji transformation.
1248         if (preedit_string.empty())
1249                 startBlinkingCursor();
1250         else
1251                 stopBlinkingCursor();
1252
1253         // last_width : for checking if last preedit string was/wasn't empty.
1254         // FIXME THREAD && FIXME
1255         // We could have more than one work area, right?
1256         static bool last_width = false;
1257         if (!last_width && preedit_string.empty()) {
1258                 // if last_width is last length of preedit string.
1259                 e->accept();
1260                 return;
1261         }
1262
1263         GuiPainter pain(d->screen_, pixelRatio());
1264         d->buffer_view_->updateMetrics();
1265         d->buffer_view_->draw(pain);
1266         FontInfo font = d->buffer_view_->cursor().getFont().fontInfo();
1267         FontMetrics const & fm = theFontMetrics(font);
1268         int height = fm.maxHeight();
1269         int cur_x = d->cursor_->rect().left();
1270         int cur_y = d->cursor_->rect().bottom();
1271
1272         // redraw area of preedit string.
1273         update(0, cur_y - height, viewport()->width(),
1274                 (height + 1) * d->preedit_lines_);
1275
1276         if (preedit_string.empty()) {
1277                 last_width = false;
1278                 d->preedit_lines_ = 1;
1279                 e->accept();
1280                 return;
1281         }
1282         last_width = true;
1283
1284         // att : stores an IM attribute.
1285         QList<QInputMethodEvent::Attribute> const & att = e->attributes();
1286
1287         // get attributes of input method cursor.
1288         // cursor_pos : cursor position in preedit string.
1289         size_t cursor_pos = 0;
1290         bool cursor_is_visible = false;
1291         for (int i = 0; i != att.size(); ++i) {
1292                 if (att.at(i).type == QInputMethodEvent::Cursor) {
1293                         cursor_pos = att.at(i).start;
1294                         cursor_is_visible = att.at(i).length != 0;
1295                         break;
1296                 }
1297         }
1298
1299         size_t preedit_length = preedit_string.length();
1300
1301         // get position of selection in input method.
1302         // FIXME: isn't there a way to do this simplier?
1303         // rStart : cursor position in selected string in IM.
1304         size_t rStart = 0;
1305         // rLength : selected string length in IM.
1306         size_t rLength = 0;
1307         if (cursor_pos < preedit_length) {
1308                 for (int i = 0; i != att.size(); ++i) {
1309                         if (att.at(i).type == QInputMethodEvent::TextFormat) {
1310                                 if (att.at(i).start <= int(cursor_pos)
1311                                         && int(cursor_pos) < att.at(i).start + att.at(i).length) {
1312                                                 rStart = att.at(i).start;
1313                                                 rLength = att.at(i).length;
1314                                                 if (!cursor_is_visible)
1315                                                         cursor_pos += rLength;
1316                                                 break;
1317                                 }
1318                         }
1319                 }
1320         }
1321         else {
1322                 rStart = cursor_pos;
1323                 rLength = 0;
1324         }
1325
1326         int const right_margin = d->buffer_view_->rightMargin();
1327         Painter::preedit_style ps;
1328         // Most often there would be only one line:
1329         d->preedit_lines_ = 1;
1330         for (size_t pos = 0; pos != preedit_length; ++pos) {
1331                 char_type const typed_char = preedit_string[pos];
1332                 // reset preedit string style
1333                 ps = Painter::preedit_default;
1334
1335                 // if we reached the right extremity of the screen, go to next line.
1336                 if (cur_x + fm.width(typed_char) > viewport()->width() - right_margin) {
1337                         cur_x = right_margin;
1338                         cur_y += height + 1;
1339                         ++d->preedit_lines_;
1340                 }
1341                 // preedit strings are displayed with dashed underline
1342                 // and partial strings are displayed white on black indicating
1343                 // that we are in selecting mode in the input method.
1344                 // FIXME: rLength == preedit_length is not a changing condition
1345                 // FIXME: should be put out of the loop.
1346                 if (pos >= rStart
1347                         && pos < rStart + rLength
1348                         && !(cursor_pos < rLength && rLength == preedit_length))
1349                         ps = Painter::preedit_selecting;
1350
1351                 if (pos == cursor_pos
1352                         && (cursor_pos < rLength && rLength == preedit_length))
1353                         ps = Painter::preedit_cursor;
1354
1355                 // draw one character and update cur_x.
1356                 cur_x += pain.preeditText(cur_x, cur_y, typed_char, font, ps);
1357         }
1358
1359         // update the preedit string screen area.
1360         update(0, cur_y - d->preedit_lines_*height, viewport()->width(),
1361                 (height + 1) * d->preedit_lines_);
1362
1363         // Don't forget to accept the event!
1364         e->accept();
1365 }
1366
1367
1368 QVariant GuiWorkArea::inputMethodQuery(Qt::InputMethodQuery query) const
1369 {
1370         QRect cur_r(0, 0, 0, 0);
1371         switch (query) {
1372                 // this is the CJK-specific composition window position and
1373                 // the context menu position when the menu key is pressed.
1374                 case Qt::ImMicroFocus:
1375                         cur_r = d->cursor_->rect();
1376                         if (d->preedit_lines_ != 1)
1377                                 cur_r.moveLeft(10);
1378                         cur_r.moveBottom(cur_r.bottom()
1379                                 + cur_r.height() * (d->preedit_lines_ - 1));
1380                         // return lower right of cursor in LyX.
1381                         return cur_r;
1382                 default:
1383                         return QWidget::inputMethodQuery(query);
1384         }
1385 }
1386
1387
1388 void GuiWorkArea::updateWindowTitle()
1389 {
1390         docstring maximize_title;
1391         docstring minimize_title;
1392
1393         Buffer const & buf = d->buffer_view_->buffer();
1394         FileName const file_name = buf.fileName();
1395         if (!file_name.empty()) {
1396                 maximize_title = file_name.displayName(130);
1397                 minimize_title = from_utf8(file_name.onlyFileName());
1398                 if (buf.lyxvc().inUse()) {
1399                         if (buf.lyxvc().locking())
1400                                 maximize_title +=  _(" (version control, locking)");
1401                         else
1402                                 maximize_title +=  _(" (version control)");
1403                 }
1404                 if (!buf.isClean()) {
1405                         maximize_title += _(" (changed)");
1406                         minimize_title += char_type('*');
1407                 }
1408                 if (buf.isReadonly())
1409                         maximize_title += _(" (read only)");
1410         }
1411
1412         QString const new_title = toqstr(maximize_title);
1413         if (new_title != windowTitle()) {
1414                 QWidget::setWindowTitle(new_title);
1415                 QWidget::setWindowIconText(toqstr(minimize_title));
1416                 titleChanged(this);
1417         }
1418 }
1419
1420
1421 bool GuiWorkArea::isFullScreen() const
1422 {
1423         return d->lyx_view_ && d->lyx_view_->isFullScreen();
1424 }
1425
1426
1427 void GuiWorkArea::scheduleRedraw()
1428 {
1429         d->schedule_redraw_ = true;
1430 }
1431
1432
1433 bool GuiWorkArea::inDialogMode() const
1434 {
1435         return d->dialog_mode_;
1436 }
1437
1438
1439 void GuiWorkArea::setDialogMode(bool mode)
1440 {
1441         d->dialog_mode_ = mode;
1442 }
1443
1444
1445 GuiCompleter & GuiWorkArea::completer()
1446 {
1447         return *d->completer_;
1448 }
1449
1450 GuiView const & GuiWorkArea::view() const
1451 {
1452         return *d->lyx_view_;
1453 }
1454
1455
1456 GuiView & GuiWorkArea::view()
1457 {
1458         return *d->lyx_view_;
1459 }
1460
1461 ////////////////////////////////////////////////////////////////////
1462 //
1463 // EmbeddedWorkArea
1464 //
1465 ////////////////////////////////////////////////////////////////////
1466
1467
1468 EmbeddedWorkArea::EmbeddedWorkArea(QWidget * w): GuiWorkArea(w)
1469 {
1470         support::TempFile tempfile("embedded.internal");
1471         tempfile.setAutoRemove(false);
1472         buffer_ = theBufferList().newInternalBuffer(tempfile.name().absFileName());
1473         buffer_->setUnnamed(true);
1474         buffer_->setFullyLoaded(true);
1475         setBuffer(*buffer_);
1476         setDialogMode(true);
1477 }
1478
1479
1480 EmbeddedWorkArea::~EmbeddedWorkArea()
1481 {
1482         // No need to destroy buffer and bufferview here, because it is done
1483         // in theBufferList() destruction loop at application exit
1484 }
1485
1486
1487 void EmbeddedWorkArea::closeEvent(QCloseEvent * ev)
1488 {
1489         disable();
1490         GuiWorkArea::closeEvent(ev);
1491 }
1492
1493
1494 void EmbeddedWorkArea::hideEvent(QHideEvent * ev)
1495 {
1496         disable();
1497         GuiWorkArea::hideEvent(ev);
1498 }
1499
1500
1501 QSize EmbeddedWorkArea::sizeHint () const
1502 {
1503         // FIXME(?):
1504         // GuiWorkArea sets the size to the screen's viewport
1505         // by returning a value this gets overridden
1506         // EmbeddedWorkArea is now sized to fit in the layout
1507         // of the parent, and has a minimum size set in GuiWorkArea
1508         // which is what we return here
1509         return QSize(100, 70);
1510 }
1511
1512
1513 void EmbeddedWorkArea::disable()
1514 {
1515         stopBlinkingCursor();
1516         if (view().currentWorkArea() != this)
1517                 return;
1518         // No problem if currentMainWorkArea() is 0 (setCurrentWorkArea()
1519         // tolerates it and shows the background logo), what happens if
1520         // an EmbeddedWorkArea is closed after closing all document WAs
1521         view().setCurrentWorkArea(view().currentMainWorkArea());
1522 }
1523
1524 ////////////////////////////////////////////////////////////////////
1525 //
1526 // TabWorkArea
1527 //
1528 ////////////////////////////////////////////////////////////////////
1529
1530 #ifdef Q_OS_MAC
1531 class NoTabFrameMacStyle : public QProxyStyle {
1532 public:
1533         ///
1534         QRect subElementRect(SubElement element, const QStyleOption * option,
1535                              const QWidget * widget = 0) const
1536         {
1537                 QRect rect = QProxyStyle::subElementRect(element, option, widget);
1538                 bool noBar = static_cast<QTabWidget const *>(widget)->count() <= 1;
1539
1540                 // The Qt Mac style puts the contents into a 3 pixel wide box
1541                 // which looks very ugly and not like other Mac applications.
1542                 // Hence we remove this here, and moreover the 16 pixel round
1543                 // frame above if the tab bar is hidden.
1544                 if (element == QStyle::SE_TabWidgetTabContents) {
1545                         rect.adjust(- rect.left(), 0, rect.left(), 0);
1546                         if (noBar)
1547                                 rect.setTop(0);
1548                 }
1549
1550                 return rect;
1551         }
1552 };
1553
1554 NoTabFrameMacStyle noTabFrameMacStyle;
1555 #endif
1556
1557
1558 TabWorkArea::TabWorkArea(QWidget * parent)
1559         : QTabWidget(parent), clicked_tab_(-1), midpressed_tab_(-1)
1560 {
1561 #ifdef Q_OS_MAC
1562         setStyle(&noTabFrameMacStyle);
1563 #endif
1564
1565         QPalette pal = palette();
1566         pal.setColor(QPalette::Active, QPalette::Button,
1567                 pal.color(QPalette::Active, QPalette::Window));
1568         pal.setColor(QPalette::Disabled, QPalette::Button,
1569                 pal.color(QPalette::Disabled, QPalette::Window));
1570         pal.setColor(QPalette::Inactive, QPalette::Button,
1571                 pal.color(QPalette::Inactive, QPalette::Window));
1572
1573         QObject::connect(this, SIGNAL(currentChanged(int)),
1574                 this, SLOT(on_currentTabChanged(int)));
1575
1576         closeBufferButton = new QToolButton(this);
1577         closeBufferButton->setPalette(pal);
1578         // FIXME: rename the icon to closebuffer.png
1579         closeBufferButton->setIcon(QIcon(getPixmap("images/", "closetab", "svgz,png")));
1580         closeBufferButton->setText("Close File");
1581         closeBufferButton->setAutoRaise(true);
1582         closeBufferButton->setCursor(Qt::ArrowCursor);
1583         closeBufferButton->setToolTip(qt_("Close File"));
1584         closeBufferButton->setEnabled(true);
1585         QObject::connect(closeBufferButton, SIGNAL(clicked()),
1586                 this, SLOT(closeCurrentBuffer()));
1587         setCornerWidget(closeBufferButton, Qt::TopRightCorner);
1588
1589         // setup drag'n'drop
1590         QTabBar* tb = new DragTabBar;
1591         connect(tb, SIGNAL(tabMoveRequested(int, int)),
1592                 this, SLOT(moveTab(int, int)));
1593         tb->setElideMode(Qt::ElideNone);
1594         setTabBar(tb);
1595
1596         // make us responsible for the context menu of the tabbar
1597         tb->setContextMenuPolicy(Qt::CustomContextMenu);
1598         connect(tb, SIGNAL(customContextMenuRequested(const QPoint &)),
1599                 this, SLOT(showContextMenu(const QPoint &)));
1600         connect(tb, SIGNAL(tabCloseRequested(int)),
1601                 this, SLOT(closeTab(int)));
1602
1603         setUsesScrollButtons(true);
1604 }
1605
1606
1607 void TabWorkArea::mousePressEvent(QMouseEvent *me)
1608 {
1609         if (me->button() == Qt::MidButton)
1610                 midpressed_tab_ = tabBar()->tabAt(me->pos());
1611         else
1612                 QTabWidget::mousePressEvent(me);
1613 }
1614
1615
1616 void TabWorkArea::mouseReleaseEvent(QMouseEvent *me)
1617 {
1618         if (me->button() == Qt::MidButton) {
1619                 int const midreleased_tab = tabBar()->tabAt(me->pos());
1620                 if (midpressed_tab_ == midreleased_tab && posIsTab(me->pos()))
1621                         closeTab(midreleased_tab);
1622         } else
1623                 QTabWidget::mouseReleaseEvent(me);
1624 }
1625
1626
1627 void TabWorkArea::paintEvent(QPaintEvent * event)
1628 {
1629         if (tabBar()->isVisible()) {
1630                 QTabWidget::paintEvent(event);
1631         } else {
1632                 // Prevent the selected tab to influence the
1633                 // painting of the frame of the tab widget.
1634                 // This is needed for gtk style in Qt.
1635                 QStylePainter p(this);
1636 #if QT_VERSION < 0x050000
1637                 QStyleOptionTabWidgetFrameV2 opt;
1638 #else
1639                 QStyleOptionTabWidgetFrame opt;
1640 #endif
1641                 initStyleOption(&opt);
1642                 opt.rect = style()->subElementRect(QStyle::SE_TabWidgetTabPane,
1643                         &opt, this);
1644                 opt.selectedTabRect = QRect();
1645                 p.drawPrimitive(QStyle::PE_FrameTabWidget, opt);
1646         }
1647 }
1648
1649
1650 bool TabWorkArea::posIsTab(QPoint position)
1651 {
1652         // tabAt returns -1 if tab does not covers position
1653         return tabBar()->tabAt(position) > -1;
1654 }
1655
1656
1657 void TabWorkArea::mouseDoubleClickEvent(QMouseEvent * event)
1658 {
1659         if (event->button() != Qt::LeftButton)
1660                 return;
1661
1662         // this code chunk is unnecessary because it seems the event only makes
1663         // it this far if it is not on a tab. I'm not sure why this is (maybe
1664         // it is handled and ended in DragTabBar?), and thus I'm not sure if
1665         // this is true in all cases and if it will be true in the future so I
1666         // leave this code for now. (skostysh, 2016-07-21)
1667         //
1668         // return early if double click on existing tabs
1669         if (posIsTab(event->pos()))
1670                 return;
1671
1672         dispatch(FuncRequest(LFUN_BUFFER_NEW));
1673 }
1674
1675
1676 void TabWorkArea::setFullScreen(bool full_screen)
1677 {
1678         for (int i = 0; i != count(); ++i) {
1679                 if (GuiWorkArea * wa = workArea(i))
1680                         wa->setFullScreen(full_screen);
1681         }
1682
1683         if (lyxrc.full_screen_tabbar)
1684                 showBar(!full_screen && count() > 1);
1685         else
1686                 showBar(count() > 1);
1687 }
1688
1689
1690 void TabWorkArea::showBar(bool show)
1691 {
1692         tabBar()->setEnabled(show);
1693         tabBar()->setVisible(show);
1694         closeBufferButton->setVisible(show && lyxrc.single_close_tab_button);
1695         setTabsClosable(!lyxrc.single_close_tab_button);
1696 }
1697
1698
1699 GuiWorkArea * TabWorkArea::currentWorkArea()
1700 {
1701         if (count() == 0)
1702                 return 0;
1703
1704         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(currentWidget());
1705         LATTEST(wa);
1706         return wa;
1707 }
1708
1709
1710 GuiWorkArea * TabWorkArea::workArea(int index)
1711 {
1712         return dynamic_cast<GuiWorkArea *>(widget(index));
1713 }
1714
1715
1716 GuiWorkArea * TabWorkArea::workArea(Buffer & buffer)
1717 {
1718         // FIXME: this method doesn't work if we have more than work area
1719         // showing the same buffer.
1720         for (int i = 0; i != count(); ++i) {
1721                 GuiWorkArea * wa = workArea(i);
1722                 LASSERT(wa, return 0);
1723                 if (&wa->bufferView().buffer() == &buffer)
1724                         return wa;
1725         }
1726         return 0;
1727 }
1728
1729
1730 void TabWorkArea::closeAll()
1731 {
1732         while (count()) {
1733                 GuiWorkArea * wa = workArea(0);
1734                 LASSERT(wa, return);
1735                 removeTab(0);
1736                 delete wa;
1737         }
1738 }
1739
1740
1741 bool TabWorkArea::setCurrentWorkArea(GuiWorkArea * work_area)
1742 {
1743         LASSERT(work_area, return false);
1744         int index = indexOf(work_area);
1745         if (index == -1)
1746                 return false;
1747
1748         if (index == currentIndex())
1749                 // Make sure the work area is up to date.
1750                 on_currentTabChanged(index);
1751         else
1752                 // Switch to the work area.
1753                 setCurrentIndex(index);
1754         work_area->setFocus();
1755
1756         return true;
1757 }
1758
1759
1760 GuiWorkArea * TabWorkArea::addWorkArea(Buffer & buffer, GuiView & view)
1761 {
1762         GuiWorkArea * wa = new GuiWorkArea(buffer, view);
1763         wa->setUpdatesEnabled(false);
1764         // Hide tabbar if there's no tab (avoid a resize and a flashing tabbar
1765         // when hiding it again below).
1766         if (!(currentWorkArea() && currentWorkArea()->isFullScreen()))
1767                 showBar(count() > 0);
1768         addTab(wa, wa->windowTitle());
1769         QObject::connect(wa, SIGNAL(titleChanged(GuiWorkArea *)),
1770                 this, SLOT(updateTabTexts()));
1771         if (currentWorkArea() && currentWorkArea()->isFullScreen())
1772                 setFullScreen(true);
1773         else
1774                 // Hide tabbar if there's only one tab.
1775                 showBar(count() > 1);
1776
1777         updateTabTexts();
1778
1779         return wa;
1780 }
1781
1782
1783 bool TabWorkArea::removeWorkArea(GuiWorkArea * work_area)
1784 {
1785         LASSERT(work_area, return false);
1786         int index = indexOf(work_area);
1787         if (index == -1)
1788                 return false;
1789
1790         work_area->setUpdatesEnabled(false);
1791         removeTab(index);
1792         delete work_area;
1793
1794         if (count()) {
1795                 // make sure the next work area is enabled.
1796                 currentWidget()->setUpdatesEnabled(true);
1797                 if (currentWorkArea() && currentWorkArea()->isFullScreen())
1798                         setFullScreen(true);
1799                 else
1800                         // Show tabbar only if there's more than one tab.
1801                         showBar(count() > 1);
1802         } else
1803                 lastWorkAreaRemoved();
1804
1805         updateTabTexts();
1806
1807         return true;
1808 }
1809
1810
1811 void TabWorkArea::on_currentTabChanged(int i)
1812 {
1813         // returns e.g. on application destruction
1814         if (i == -1)
1815                 return;
1816         GuiWorkArea * wa = workArea(i);
1817         LASSERT(wa, return);
1818         wa->setUpdatesEnabled(true);
1819         wa->redraw(true);
1820         wa->setFocus();
1821         ///
1822         currentWorkAreaChanged(wa);
1823
1824         LYXERR(Debug::GUI, "currentTabChanged " << i
1825                 << " File: " << wa->bufferView().buffer().absFileName());
1826 }
1827
1828
1829 void TabWorkArea::closeCurrentBuffer()
1830 {
1831         GuiWorkArea * wa;
1832         if (clicked_tab_ == -1)
1833                 wa = currentWorkArea();
1834         else {
1835                 wa = workArea(clicked_tab_);
1836                 LASSERT(wa, return);
1837         }
1838         wa->view().closeWorkArea(wa);
1839 }
1840
1841
1842 void TabWorkArea::hideCurrentTab()
1843 {
1844         GuiWorkArea * wa;
1845         if (clicked_tab_ == -1)
1846                 wa = currentWorkArea();
1847         else {
1848                 wa = workArea(clicked_tab_);
1849                 LASSERT(wa, return);
1850         }
1851         wa->view().hideWorkArea(wa);
1852 }
1853
1854
1855 void TabWorkArea::closeTab(int index)
1856 {
1857         on_currentTabChanged(index);
1858         GuiWorkArea * wa;
1859         if (index == -1)
1860                 wa = currentWorkArea();
1861         else {
1862                 wa = workArea(index);
1863                 LASSERT(wa, return);
1864         }
1865         wa->view().closeWorkArea(wa);
1866 }
1867
1868
1869 ///
1870 class DisplayPath {
1871 public:
1872         /// make vector happy
1873         // coverity[UNINIT_CTOR]
1874         DisplayPath() {}
1875         ///
1876         DisplayPath(int tab, FileName const & filename)
1877                 : tab_(tab)
1878         {
1879                 filename_ = (filename.extension() == "lyx") ?
1880                         toqstr(filename.onlyFileNameWithoutExt())
1881                         : toqstr(filename.onlyFileName());
1882                 postfix_ = toqstr(filename.absoluteFilePath()).
1883                         split("/", QString::SkipEmptyParts);
1884                 postfix_.pop_back();
1885                 abs_ = toqstr(filename.absoluteFilePath());
1886                 dottedPrefix_ = false;
1887         }
1888
1889         /// Absolute path for debugging.
1890         QString abs() const
1891         {
1892                 return abs_;
1893         }
1894         /// Add the first segment from the postfix or three dots to the prefix.
1895         /// Merge multiple dot tripples. In fact dots are added lazily, i.e. only
1896         /// when really needed.
1897         void shiftPathSegment(bool dotted)
1898         {
1899                 if (postfix_.count() <= 0)
1900                         return;
1901
1902                 if (!dotted) {
1903                         if (dottedPrefix_ && !prefix_.isEmpty())
1904                                 prefix_ += ellipsisSlash_;
1905                         prefix_ += postfix_.front() + "/";
1906                 }
1907                 dottedPrefix_ = dotted && !prefix_.isEmpty();
1908                 postfix_.pop_front();
1909         }
1910         ///
1911         QString displayString() const
1912         {
1913                 if (prefix_.isEmpty())
1914                         return filename_;
1915
1916                 bool dots = dottedPrefix_ || !postfix_.isEmpty();
1917                 return prefix_ + (dots ? ellipsisSlash_ : "") + filename_;
1918         }
1919         ///
1920         QString forecastPathString() const
1921         {
1922                 if (postfix_.count() == 0)
1923                         return displayString();
1924
1925                 return prefix_
1926                         + (dottedPrefix_ ? ellipsisSlash_ : "")
1927                         + postfix_.front() + "/";
1928         }
1929         ///
1930         bool final() const { return postfix_.empty(); }
1931         ///
1932         int tab() const { return tab_; }
1933
1934 private:
1935         /// ".../"
1936         static QString const ellipsisSlash_;
1937         ///
1938         QString prefix_;
1939         ///
1940         QStringList postfix_;
1941         ///
1942         QString filename_;
1943         ///
1944         QString abs_;
1945         ///
1946         int tab_;
1947         ///
1948         bool dottedPrefix_;
1949 };
1950
1951
1952 QString const DisplayPath::ellipsisSlash_ = QString(QChar(0x2026)) + "/";
1953
1954
1955 ///
1956 bool operator<(DisplayPath const & a, DisplayPath const & b)
1957 {
1958         return a.displayString() < b.displayString();
1959 }
1960
1961 ///
1962 bool operator==(DisplayPath const & a, DisplayPath const & b)
1963 {
1964         return a.displayString() == b.displayString();
1965 }
1966
1967
1968 void TabWorkArea::updateTabTexts()
1969 {
1970         size_t n = count();
1971         if (n == 0)
1972                 return;
1973         std::list<DisplayPath> paths;
1974         typedef std::list<DisplayPath>::iterator It;
1975
1976         // collect full names first: path into postfix, empty prefix and
1977         // filename without extension
1978         for (size_t i = 0; i < n; ++i) {
1979                 GuiWorkArea * i_wa = workArea(i);
1980                 FileName const fn = i_wa->bufferView().buffer().fileName();
1981                 paths.push_back(DisplayPath(i, fn));
1982         }
1983
1984         // go through path segments and see if it helps to make the path more unique
1985         bool somethingChanged = true;
1986         bool allFinal = false;
1987         while (somethingChanged && !allFinal) {
1988                 // adding path segments changes order
1989                 paths.sort();
1990
1991                 LYXERR(Debug::GUI, "updateTabTexts() iteration start");
1992                 somethingChanged = false;
1993                 allFinal = true;
1994
1995                 // find segments which are not unique (i.e. non-atomic)
1996                 It it = paths.begin();
1997                 It segStart = it;
1998                 QString segString = it->displayString();
1999                 for (; it != paths.end(); ++it) {
2000                         // look to the next item
2001                         It next = it;
2002                         ++next;
2003
2004                         // final?
2005                         allFinal = allFinal && it->final();
2006
2007                         LYXERR(Debug::GUI, "it = " << it->abs()
2008                                << " => " << it->displayString());
2009
2010                         // still the same segment?
2011                         QString nextString;
2012                         if ((next != paths.end()
2013                              && (nextString = next->displayString()) == segString))
2014                                 continue;
2015                         LYXERR(Debug::GUI, "segment ended");
2016
2017                         // only a trivial one with one element?
2018                         if (it == segStart) {
2019                                 // start new segment
2020                                 segStart = next;
2021                                 segString = nextString;
2022                                 continue;
2023                         }
2024
2025                         // we found a non-atomic segment segStart <= sit <= it < next.
2026                         // Shift path segments and hope for the best
2027                         // that it makes the path more unique.
2028                         somethingChanged = true;
2029                         It sit = segStart;
2030                         // this is ok for the reason mentioned  in the previous comment.
2031                         // coverity[INVALIDATE_ITERATOR]
2032                         QString dspString = sit->forecastPathString();
2033                         LYXERR(Debug::GUI, "first forecast found for "
2034                                << sit->abs() << " => " << dspString);
2035                         ++sit;
2036                         bool moreUnique = false;
2037                         for (; sit != next; ++sit) {
2038                                 if (sit->forecastPathString() != dspString) {
2039                                         LYXERR(Debug::GUI, "different forecast found for "
2040                                                 << sit->abs() << " => " << sit->forecastPathString());
2041                                         moreUnique = true;
2042                                         break;
2043                                 }
2044                                 LYXERR(Debug::GUI, "same forecast found for "
2045                                         << sit->abs() << " => " << dspString);
2046                         }
2047
2048                         // if the path segment helped, add it. Otherwise add dots
2049                         bool dots = !moreUnique;
2050                         LYXERR(Debug::GUI, "using dots = " << dots);
2051                         for (sit = segStart; sit != next; ++sit) {
2052                                 sit->shiftPathSegment(dots);
2053                                 LYXERR(Debug::GUI, "shifting "
2054                                         << sit->abs() << " => " << sit->displayString());
2055                         }
2056
2057                         // start new segment
2058                         segStart = next;
2059                         segString = nextString;
2060                 }
2061         }
2062
2063         // set new tab titles
2064         for (It it = paths.begin(); it != paths.end(); ++it) {
2065                 int const tab_index = it->tab();
2066                 Buffer const & buf = workArea(tab_index)->bufferView().buffer();
2067                 QString tab_text = it->displayString().replace("&", "&&");
2068                 if (!buf.fileName().empty() && !buf.isClean())
2069                         tab_text += "*";
2070                 QString tab_tooltip = it->abs();
2071                 if (buf.isReadonly()) {
2072                         setTabIcon(tab_index, QIcon(getPixmap("images/", "emblem-readonly", "svgz,png")));
2073                         tab_tooltip = qt_("%1 (read only)").arg(it->abs());
2074                 } else
2075                         setTabIcon(tab_index, QIcon());
2076                 setTabText(tab_index, tab_text);
2077                 setTabToolTip(tab_index, tab_tooltip);
2078         }
2079 }
2080
2081
2082 void TabWorkArea::showContextMenu(const QPoint & pos)
2083 {
2084         // which tab?
2085         clicked_tab_ = static_cast<DragTabBar *>(tabBar())->tabAt(pos);
2086         if (clicked_tab_ == -1)
2087                 return;
2088
2089         // show tab popup
2090         QMenu popup;
2091         popup.addAction(QIcon(getPixmap("images/", "hidetab", "svgz,png")),
2092                 qt_("Hide tab"), this, SLOT(hideCurrentTab()));
2093         popup.addAction(QIcon(getPixmap("images/", "closetab", "svgz,png")),
2094                 qt_("Close tab"), this, SLOT(closeCurrentBuffer()));
2095         popup.exec(tabBar()->mapToGlobal(pos));
2096
2097         clicked_tab_ = -1;
2098 }
2099
2100
2101 void TabWorkArea::moveTab(int fromIndex, int toIndex)
2102 {
2103         QWidget * w = widget(fromIndex);
2104         QIcon icon = tabIcon(fromIndex);
2105         QString text = tabText(fromIndex);
2106
2107         setCurrentIndex(fromIndex);
2108         removeTab(fromIndex);
2109         insertTab(toIndex, w, icon, text);
2110         setCurrentIndex(toIndex);
2111 }
2112
2113
2114 DragTabBar::DragTabBar(QWidget* parent)
2115         : QTabBar(parent)
2116 {
2117         setAcceptDrops(true);
2118         setTabsClosable(!lyxrc.single_close_tab_button);
2119 }
2120
2121
2122 void DragTabBar::mousePressEvent(QMouseEvent * event)
2123 {
2124         if (event->button() == Qt::LeftButton)
2125                 dragStartPos_ = event->pos();
2126         QTabBar::mousePressEvent(event);
2127 }
2128
2129
2130 void DragTabBar::mouseMoveEvent(QMouseEvent * event)
2131 {
2132         // If the left button isn't pressed anymore then return
2133         if (!(event->buttons() & Qt::LeftButton))
2134                 return;
2135
2136         // If the distance is too small then return
2137         if ((event->pos() - dragStartPos_).manhattanLength()
2138             < QApplication::startDragDistance())
2139                 return;
2140
2141         // did we hit something after all?
2142         int tab = tabAt(dragStartPos_);
2143         if (tab == -1)
2144                 return;
2145
2146         // simulate button release to remove highlight from button
2147         int i = currentIndex();
2148         QMouseEvent me(QEvent::MouseButtonRelease, dragStartPos_,
2149                 event->button(), event->buttons(), 0);
2150         QTabBar::mouseReleaseEvent(&me);
2151         setCurrentIndex(i);
2152
2153         // initiate Drag
2154         QDrag * drag = new QDrag(this);
2155         QMimeData * mimeData = new QMimeData;
2156         // a crude way to distinguish tab-reodering drops from other ones
2157         mimeData->setData("action", "tab-reordering") ;
2158         drag->setMimeData(mimeData);
2159
2160         // get tab pixmap as cursor
2161         QRect r = tabRect(tab);
2162         QPixmap pixmap(r.size());
2163         render(&pixmap, - r.topLeft());
2164         drag->setPixmap(pixmap);
2165         drag->exec();
2166 }
2167
2168
2169 void DragTabBar::dragEnterEvent(QDragEnterEvent * event)
2170 {
2171         // Only accept if it's an tab-reordering request
2172         QMimeData const * m = event->mimeData();
2173         QStringList formats = m->formats();
2174         if (formats.contains("action")
2175             && m->data("action") == "tab-reordering")
2176                 event->acceptProposedAction();
2177 }
2178
2179
2180 void DragTabBar::dropEvent(QDropEvent * event)
2181 {
2182         int fromIndex = tabAt(dragStartPos_);
2183         int toIndex = tabAt(event->pos());
2184
2185         // Tell interested objects that
2186         if (fromIndex != toIndex)
2187                 tabMoveRequested(fromIndex, toIndex);
2188         event->acceptProposedAction();
2189 }
2190
2191
2192 } // namespace frontend
2193 } // namespace lyx
2194
2195 #include "moc_GuiWorkArea.cpp"