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 "GuiApplication.h"
  20 #include "GuiCompleter.h"
  21 #include "GuiKeySymbol.h"
  22 #include "GuiPainter.h"
  23 #include "GuiView.h"
  24 #include "Menus.h"
  25 #include "qt_helpers.h"
  26
  27 #include "Buffer.h"
  28 #include "BufferList.h"
  29 #include "BufferParams.h"
  30 #include "BufferView.h"
  31 #include "CoordCache.h"
  32 #include "Cursor.h"
  33 #include "Font.h"
  34 #include "FuncRequest.h"
  35 #include "KeySymbol.h"
  36 #include "Language.h"
  37 #include "LyX.h"
  38 #include "LyXRC.h"
  39 #include "LyXVC.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/lassert.h"
  50 #include "support/TempFile.h"
  51
  52 #include "frontends/Application.h"
  53 #include "frontends/FontMetrics.h"
  54 #include "frontends/WorkAreaManager.h"
  55
  56 #include <QContextMenuEvent>
  57 #if (QT_VERSION < 0x050000)
  58 #include <QInputContext>
  59 #endif
  60 #include <QDrag>
  61 #include <QHelpEvent>
  62 #ifdef Q_OS_MAC
  63 #include <QProxyStyle>
  64 #endif
  65 #include <QMainWindow>
  66 #include <QMimeData>
  67 #include <QMenu>
  68 #include <QPainter>
  69 #include <QPalette>
  70 #include <QScrollBar>
  71 #include <QStyleOption>
  72 #include <QStylePainter>
  73 #include <QTimer>
  74 #include <QToolButton>
  75 #include <QToolTip>
  76 #include <QMenuBar>
  77
  78 #include <cmath>
  79 #include <iostream>
  80
  81 int const TabIndicatorWidth = 3;
  82
  83 #undef KeyPress
  84 #undef NoModifier
  85
  86 using namespace std;
  87 using namespace lyx::support;
  88
  89 namespace lyx {
  90
  91
  92 /// return the LyX mouse button state from Qt's
  93 static mouse_button::state q_button_state(Qt::MouseButton button)
  94 {
  95         mouse_button::state b = mouse_button::none;
  96         switch (button) {
  97                 case Qt::LeftButton:
  98                         b = mouse_button::button1;
  99                         break;
 100                 case Qt::MidButton:
 101                         b = mouse_button::button2;
 102                         break;
 103                 case Qt::RightButton:
 104                         b = mouse_button::button3;
 105                         break;
 106                 default:
 107                         break;
 108         }
 109         return b;
 110 }
 111
 112
 113 /// return the LyX mouse button state from Qt's
 114 mouse_button::state q_motion_state(Qt::MouseButtons state)
 115 {
 116         mouse_button::state b = mouse_button::none;
 117         if (state & Qt::LeftButton)
 118                 b |= mouse_button::button1;
 119         if (state & Qt::MidButton)
 120                 b |= mouse_button::button2;
 121         if (state & Qt::RightButton)
 122                 b |= mouse_button::button3;
 123         return b;
 124 }
 125
 126
 127 namespace frontend {
 128
 129 class CaretWidget {
 130 public:
 131         CaretWidget() : rtl_(false), l_shape_(false), completable_(false),
 132                 x_(0), caret_width_(0)
 133         {}
 134
 135         void draw(QPainter & painter)
 136         {
 137                 if (!rect_.isValid())
 138                         return;
 139
 140                 int y = rect_.top();
 141                 int l = x_ - rect_.left();
 142                 int r = rect_.right() - x_;
 143                 int bot = rect_.bottom();
 144
 145                 // draw vertical line
 146                 painter.fillRect(x_, y, caret_width_, rect_.height(), color_);
 147
 148                 // draw RTL/LTR indication
 149                 painter.setPen(color_);
 150                 if (l_shape_) {
 151                         if (rtl_)
 152                                 painter.drawLine(x_, bot, x_ - l, bot);
 153                         else
 154                                 painter.drawLine(x_, bot, x_ + caret_width_ + r, bot);
 155                 }
 156
 157                 // draw completion triangle
 158                 if (completable_) {
 159                         int m = y + rect_.height() / 2;
 160                         int d = TabIndicatorWidth - 1;
 161                         if (rtl_) {
 162                                 painter.drawLine(x_ - 1, m - d, x_ - 1 - d, m);
 163                                 painter.drawLine(x_ - 1, m + d, x_ - 1 - d, m);
 164                         } else {
 165                                 painter.drawLine(x_ + caret_width_, m - d, x_ + caret_width_ + d, m);
 166                                 painter.drawLine(x_ + caret_width_, m + d, x_ + caret_width_ + d, m);
 167                         }
 168                 }
 169         }
 170
 171         void update(int x, int y, int h, bool l_shape,
 172                 bool rtl, bool completable)
 173         {
 174                 color_ = guiApp->colorCache().get(Color_cursor);
 175                 l_shape_ = l_shape;
 176                 rtl_ = rtl;
 177                 completable_ = completable;
 178                 x_ = x;
 179
 180                 // extension to left and right
 181                 int l = 0;
 182                 int r = 0;
 183
 184                 // RTL/LTR indication
 185                 if (l_shape_) {
 186                         if (rtl)
 187                                 l += h / 3;
 188                         else
 189                                 r += h / 3;
 190                 }
 191
 192                 // completion triangle
 193                 if (completable_) {
 194                         if (rtl)
 195                                 l = max(l, TabIndicatorWidth);
 196                         else
 197                                 r = max(r, TabIndicatorWidth);
 198                 }
 199
 200                 caret_width_ = lyxrc.cursor_width
 201                         ? lyxrc.cursor_width
 202                         : 1 + int((lyxrc.currentZoom + 50) / 200.0);
 203
 204                 // compute overall rectangle
 205                 rect_ = QRect(x - l, y, caret_width_ + r + l, h);
 206         }
 207
 208         QRect const & rect() { return rect_; }
 209
 210 private:
 211         /// cursor is in RTL or LTR text
 212         bool rtl_;
 213         /// indication for RTL or LTR
 214         bool l_shape_;
 215         /// triangle to show that a completion is available
 216         bool completable_;
 217         ///
 218         QColor color_;
 219         /// rectangle, possibly with l_shape and completion triangle
 220         QRect rect_;
 221         /// x position (were the vertical line is drawn)
 222         int x_;
 223         /// the width of the vertical blinking bar
 224         int caret_width_;
 225 };
 226
 227
 228 // This is a 'heartbeat' generating synthetic mouse move events when the
 229 // cursor is at the top or bottom edge of the viewport. One scroll per 0.2 s
 230 SyntheticMouseEvent::SyntheticMouseEvent()
 231         : timeout(200), restart_timeout(true)
 232 {}
 233
 234
 235 GuiWorkArea::Private::Private(GuiWorkArea * parent)
 236 : p(parent), buffer_view_(0), lyx_view_(0),
 237   caret_(0), caret_visible_(false),
 238   need_resize_(false), schedule_redraw_(false), preedit_lines_(1),
 239   pixel_ratio_(1.0),
 240   completer_(new GuiCompleter(p, p)), dialog_mode_(false), shell_escape_(false),
 241   read_only_(false), clean_(true), externally_modified_(false)
 242 {
 243         int const time = QApplication::cursorFlashTime() / 2;
 244         if (time > 0) {
 245                 caret_timeout_.setInterval(time);
 246                 caret_timeout_.start();
 247         } else {
 248                 // let's initialize this just to be safe
 249                 caret_timeout_.setInterval(500);
 250         }
 251 }
 252
 253
 254 GuiWorkArea::Private::~Private()
 255 {
 256         // If something is wrong with the buffer, we can ignore it safely
 257         try {
 258                 buffer_view_->buffer().workAreaManager().remove(p);
 259         } catch(...) {}
 260         delete buffer_view_;
 261         delete caret_;
 262         // Completer has a QObject parent and is thus automatically destroyed.
 263         // See #4758.
 264         // delete completer_;
 265 }
 266
 267
 268 GuiWorkArea::GuiWorkArea(QWidget * /* w */)
 269 : d(new Private(this))
 270 {
 271 }
 272
 273
 274 GuiWorkArea::GuiWorkArea(Buffer & buffer, GuiView & gv)
 275 : d(new Private(this))
 276 {
 277         setGuiView(gv);
 278         buffer.params().display_pixel_ratio = theGuiApp()->pixelRatio();
 279         setBuffer(buffer);
 280         init();
 281 }
 282
 283
 284 double GuiWorkArea::pixelRatio() const
 285 {
 286 #if QT_VERSION >= 0x050000
 287         return qt_scale_factor * devicePixelRatio();
 288 #else
 289         return 1.0;
 290 #endif
 291 }
 292
 293
 294 void GuiWorkArea::init()
 295 {
 296         // Setup the signals
 297         connect(&d->caret_timeout_, SIGNAL(timeout()),
 298                 this, SLOT(toggleCaret()));
 299
 300         // This connection is closed at the same time as this is destroyed.
 301         d->synthetic_mouse_event_.timeout.timeout.connect([this](){
 302                         generateSyntheticMouseEvent();
 303                 });
 304
 305         // With Qt4.5 a mouse event will happen before the first paint event
 306         // so make sure that the buffer view has an up to date metrics.
 307         d->buffer_view_->resize(viewport()->width(), viewport()->height());
 308         d->caret_ = new frontend::CaretWidget();
 309
 310         setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 311         setAcceptDrops(true);
 312         setMouseTracking(true);
 313         setMinimumSize(100, 70);
 314         setFrameStyle(QFrame::NoFrame);
 315         updateWindowTitle();
 316
 317         d->updateCursorShape();
 318
 319         // we paint our own background
 320         viewport()->setAttribute(Qt::WA_OpaquePaintEvent);
 321
 322         setFocusPolicy(Qt::StrongFocus);
 323
 324         LYXERR(Debug::GUI, "viewport width: " << viewport()->width()
 325                 << "  viewport height: " << viewport()->height());
 326
 327         // Enables input methods for asian languages.
 328         // Must be set when creating custom text editing widgets.
 329         setAttribute(Qt::WA_InputMethodEnabled, true);
 330 }
 331
 332
 333 GuiWorkArea::~GuiWorkArea()
 334 {
 335         delete d;
 336 }
 337
 338
 339 void GuiWorkArea::Private::updateCursorShape()
 340 {
 341         bool const clickable = buffer_view_ && buffer_view_->clickableInset();
 342         p->viewport()->setCursor(clickable ? Qt::PointingHandCursor
 343                                            : Qt::IBeamCursor);
 344 }
 345
 346
 347 void GuiWorkArea::setGuiView(GuiView & gv)
 348 {
 349         d->lyx_view_ = &gv;
 350 }
 351
 352
 353 void GuiWorkArea::setBuffer(Buffer & buffer)
 354 {
 355         delete d->buffer_view_;
 356         d->buffer_view_ = new BufferView(buffer);
 357         buffer.workAreaManager().add(this);
 358
 359         // HACK: Prevents an additional redraw when the scrollbar pops up
 360         // which regularily happens on documents with more than one page.
 361         // The policy  should be set to "Qt::ScrollBarAsNeeded" soon.
 362         // Since we have no geometry information yet, we assume that
 363         // a document needs a scrollbar if there is more then four
 364         // paragraph in the outermost text.
 365         if (buffer.text().paragraphs().size() > 4)
 366                 setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
 367         QTimer::singleShot(50, this, SLOT(fixVerticalScrollBar()));
 368         Q_EMIT bufferViewChanged();
 369 }
 370
 371
 372 void GuiWorkArea::fixVerticalScrollBar()
 373 {
 374         if (!isFullScreen())
 375                 setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
 376 }
 377
 378
 379 void GuiWorkArea::close()
 380 {
 381         d->lyx_view_->removeWorkArea(this);
 382 }
 383
 384
 385 void GuiWorkArea::setFullScreen(bool full_screen)
 386 {
 387         d->buffer_view_->setFullScreen(full_screen);
 388         setFrameStyle(QFrame::NoFrame);
 389         if (full_screen) {
 390                 setFrameStyle(QFrame::NoFrame);
 391                 if (lyxrc.full_screen_scrollbar)
 392                         setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 393         } else
 394                 setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
 395 }
 396
 397
 398 BufferView & GuiWorkArea::bufferView()
 399 {
 400         return *d->buffer_view_;
 401 }
 402
 403
 404 BufferView const & GuiWorkArea::bufferView() const
 405 {
 406         return *d->buffer_view_;
 407 }
 408
 409
 410 void GuiWorkArea::stopBlinkingCaret()
 411 {
 412         d->caret_timeout_.stop();
 413         d->hideCaret();
 414 }
 415
 416
 417 void GuiWorkArea::startBlinkingCaret()
 418 {
 419         // do not show the cursor if the view is busy
 420         if (view().busy())
 421                 return;
 422
 423         Point p;
 424         int h = 0;
 425         d->buffer_view_->cursorPosAndHeight(p, h);
 426         // Don't start blinking if the cursor isn't on screen.
 427         if (!d->buffer_view_->cursorInView(p, h))
 428                 return;
 429
 430         d->showCaret();
 431
 432         //we're not supposed to cache this value.
 433         int const time = QApplication::cursorFlashTime() / 2;
 434         if (time <= 0)
 435                 return;
 436         d->caret_timeout_.setInterval(time);
 437         d->caret_timeout_.start();
 438 }
 439
 440
 441 void GuiWorkArea::toggleCaret()
 442 {
 443         if (d->caret_visible_)
 444                 d->hideCaret();
 445         else
 446                 d->showCaret();
 447 }
 448
 449
 450 void GuiWorkArea::redraw(bool update_metrics)
 451 {
 452         if (!isVisible())
 453                 // No need to redraw in this case.
 454                 return;
 455
 456         // No need to do anything if this is the current view. The BufferView
 457         // metrics are already up to date.
 458         if (update_metrics || d->lyx_view_ != guiApp->currentView()
 459                 || d->lyx_view_->currentWorkArea() != this) {
 460                 // FIXME: it would be nice to optimize for the off-screen case.
 461                 d->buffer_view_->cursor().fixIfBroken();
 462                 d->buffer_view_->updateMetrics();
 463                 d->buffer_view_->cursor().fixIfBroken();
 464         }
 465
 466         // update cursor position, because otherwise it has to wait until
 467         // the blinking interval is over
 468         if (d->caret_visible_) {
 469                 d->hideCaret();
 470                 d->showCaret();
 471         }
 472
 473         LYXERR(Debug::WORKAREA, "WorkArea::redraw screen");
 474         viewport()->update();
 475
 476         /// \warning: scrollbar updating *must* be done after the BufferView is drawn
 477         /// because \c BufferView::updateScrollbar() is called in \c BufferView::draw().
 478         d->updateScrollbar();
 479         d->lyx_view_->updateStatusBar();
 480
 481         if (lyxerr.debugging(Debug::WORKAREA))
 482                 d->buffer_view_->coordCache().dump();
 483
 484         updateWindowTitle();
 485
 486         d->updateCursorShape();
 487 }
 488
 489
 490 // Keep in sync with GuiWorkArea::processKeySym below
 491 bool GuiWorkArea::queryKeySym(KeySymbol const & key, KeyModifier mod) const
 492 {
 493         return guiApp->queryKeySym(key, mod);
 494 }
 495
 496
 497 // Keep in sync with GuiWorkArea::queryKeySym above
 498 void GuiWorkArea::processKeySym(KeySymbol const & key, KeyModifier mod)
 499 {
 500         if (d->lyx_view_->isFullScreen() && d->lyx_view_->menuBar()->isVisible()
 501                 && lyxrc.full_screen_menubar) {
 502                 // FIXME HACK: we should not have to do this here. See related comment
 503                 // in GuiView::event() (QEvent::ShortcutOverride)
 504                 d->lyx_view_->menuBar()->hide();
 505         }
 506
 507         // In order to avoid bad surprise in the middle of an operation,
 508         // we better stop the blinking caret...
 509         // the cursor gets restarted in GuiView::restartCaret()
 510         stopBlinkingCaret();
 511         guiApp->processKeySym(key, mod);
 512 }
 513
 514
 515 void GuiWorkArea::Private::dispatch(FuncRequest const & cmd)
 516 {
 517         // Handle drag&drop
 518         if (cmd.action() == LFUN_FILE_OPEN) {
 519                 DispatchResult dr;
 520                 lyx_view_->dispatch(cmd, dr);
 521                 return;
 522         }
 523
 524         bool const notJustMovingTheMouse =
 525                 cmd.action() != LFUN_MOUSE_MOTION || cmd.button() != mouse_button::none;
 526
 527         // In order to avoid bad surprise in the middle of an operation, we better stop
 528         // the blinking cursor.
 529         if (notJustMovingTheMouse)
 530                 p->stopBlinkingCaret();
 531
 532         buffer_view_->mouseEventDispatch(cmd);
 533
 534         // Skip these when selecting
 535         // FIXME: let GuiView take care of those.
 536         if (cmd.action() != LFUN_MOUSE_MOTION) {
 537                 completer_->updateVisibility(false, false);
 538                 lyx_view_->updateDialogs();
 539                 lyx_view_->updateStatusBar();
 540         }
 541
 542         // GUI tweaks except with mouse motion with no button pressed.
 543         if (notJustMovingTheMouse) {
 544                 // Slight hack: this is only called currently when we
 545                 // clicked somewhere, so we force through the display
 546                 // of the new status here.
 547                 // FIXME: let GuiView take care of those.
 548                 lyx_view_->clearMessage();
 549
 550                 // Show the cursor immediately after any operation
 551                 p->startBlinkingCaret();
 552         }
 553
 554         updateCursorShape();
 555 }
 556
 557
 558 void GuiWorkArea::Private::resizeBufferView()
 559 {
 560         // WARNING: Please don't put any code that will trigger a repaint here!
 561         // We are already inside a paint event.
 562         p->stopBlinkingCaret();
 563         // Warn our container (GuiView).
 564         p->busy(true);
 565
 566         Point point;
 567         int h = 0;
 568         buffer_view_->cursorPosAndHeight(point, h);
 569         bool const caret_in_view = buffer_view_->cursorInView(point, h);
 570         buffer_view_->resize(p->viewport()->width(), p->viewport()->height());
 571         if (caret_in_view)
 572                 buffer_view_->scrollToCursor();
 573         p->viewport()->update();
 574
 575         // Update scrollbars which might have changed due different
 576         // BufferView dimension. This is especially important when the
 577         // BufferView goes from zero-size to the real-size for the first time,
 578         // as the scrollbar paramters are then set for the first time.
 579         updateScrollbar();
 580
 581         need_resize_ = false;
 582         p->busy(false);
 583         // Eventually, restart the cursor after the resize event.
 584         // We might be resizing even if the focus is on another widget so we only
 585         // restart the cursor if we have the focus.
 586         if (p->hasFocus())
 587                 QTimer::singleShot(50, p, SLOT(startBlinkingCaret()));
 588 }
 589
 590
 591 void GuiWorkArea::Private::showCaret()
 592 {
 593         if (caret_visible_)
 594                 return;
 595
 596         Point point;
 597         int h = 0;
 598         buffer_view_->cursorPosAndHeight(point, h);
 599         if (!buffer_view_->cursorInView(point, h))
 600                 return;
 601
 602         // RTL or not RTL
 603         bool l_shape = false;
 604         Font const & realfont = buffer_view_->cursor().real_current_font;
 605         BufferParams const & bp = buffer_view_->buffer().params();
 606         bool const samelang = realfont.language() == bp.language;
 607         bool const isrtl = realfont.isVisibleRightToLeft();
 608
 609         if (!samelang || isrtl != bp.language->rightToLeft())
 610                 l_shape = true;
 611
 612         // The ERT language hack needs fixing up
 613         if (realfont.language() == latex_language)
 614                 l_shape = false;
 615
 616         // show cursor on screen
 617         Cursor & cur = buffer_view_->cursor();
 618         bool completable = cur.inset().showCompletionCursor()
 619                 && completer_->completionAvailable()
 620                 && !completer_->popupVisible()
 621                 && !completer_->inlineVisible();
 622         caret_visible_ = true;
 623
 624         //int cur_x = buffer_view_->getPos(cur).x_;
 625         // We may have decided to slide the cursor row so that cursor
 626         // is visible.
 627         point.x_ -= buffer_view_->horizScrollOffset();
 628
 629         caret_->update(point.x_, point.y_, h, l_shape, isrtl, completable);
 630
 631         if (schedule_redraw_) {
 632                 // This happens when a graphic conversion is finished. As we don't know
 633                 // the size of the new graphics, it's better the update everything.
 634                 // We can't use redraw() here because this would trigger a infinite
 635                 // recursive loop with showCaret().
 636                 buffer_view_->resize(p->viewport()->width(), p->viewport()->height());
 637                 p->viewport()->update();
 638                 updateScrollbar();
 639                 schedule_redraw_ = false;
 640                 return;
 641         }
 642
 643         p->viewport()->update(caret_->rect());
 644 }
 645
 646
 647 void GuiWorkArea::Private::hideCaret()
 648 {
 649         if (!caret_visible_)
 650                 return;
 651
 652         caret_visible_ = false;
 653         //if (!qApp->focusWidget())
 654                 p->viewport()->update(caret_->rect());
 655 }
 656
 657
 658 void GuiWorkArea::Private::updateScrollbar()
 659 {
 660         // Prevent setRange() and setSliderPosition from causing recursive calls via
 661         // the signal valueChanged. (#10311)
 662         QObject::disconnect(p->verticalScrollBar(), SIGNAL(valueChanged(int)),
 663                             p, SLOT(scrollTo(int)));
 664         ScrollbarParameters const & scroll_ = buffer_view_->scrollbarParameters();
 665         p->verticalScrollBar()->setRange(scroll_.min, scroll_.max);
 666         p->verticalScrollBar()->setPageStep(scroll_.page_step);
 667         p->verticalScrollBar()->setSingleStep(scroll_.single_step);
 668         p->verticalScrollBar()->setSliderPosition(0);
 669         // Connect to the vertical scroll bar
 670         QObject::connect(p->verticalScrollBar(), SIGNAL(valueChanged(int)),
 671                          p, SLOT(scrollTo(int)));
 672 }
 673
 674
 675 void GuiWorkArea::scrollTo(int value)
 676 {
 677         stopBlinkingCaret();
 678         d->buffer_view_->scrollDocView(value, true);
 679
 680         if (lyxrc.cursor_follows_scrollbar) {
 681                 d->buffer_view_->setCursorFromScrollbar();
 682                 // FIXME: let GuiView take care of those.
 683                 d->lyx_view_->updateLayoutList();
 684         }
 685         // Show the cursor immediately after any operation.
 686         startBlinkingCaret();
 687         // FIXME QT5
 688 #ifdef Q_WS_X11
 689         QApplication::syncX();
 690 #endif
 691 }
 692
 693
 694 bool GuiWorkArea::event(QEvent * e)
 695 {
 696         switch (e->type()) {
 697         case QEvent::ToolTip: {
 698                 QHelpEvent * helpEvent = static_cast<QHelpEvent *>(e);
 699                 if (lyxrc.use_tooltip) {
 700                         QPoint pos = helpEvent->pos();
 701                         if (pos.x() < viewport()->width()) {
 702                                 QString s = toqstr(d->buffer_view_->toolTip(pos.x(), pos.y()));
 703                                 QToolTip::showText(helpEvent->globalPos(), formatToolTip(s,35));
 704                         }
 705                         else
 706                                 QToolTip::hideText();
 707                 }
 708                 // Don't forget to accept the event!
 709                 e->accept();
 710                 return true;
 711         }
 712
 713         case QEvent::ShortcutOverride:
 714                 // keyPressEvent is ShortcutOverride-aware and only accepts the event in
 715                 // this case
 716                 keyPressEvent(static_cast<QKeyEvent *>(e));
 717                 return e->isAccepted();
 718
 719         case QEvent::KeyPress: {
 720                 // We catch this event in order to catch the Tab or Shift+Tab key press
 721                 // which are otherwise reserved to focus switching between controls
 722                 // within a dialog.
 723                 QKeyEvent * ke = static_cast<QKeyEvent*>(e);
 724                 if ((ke->key() == Qt::Key_Tab && ke->modifiers() == Qt::NoModifier)
 725                         || (ke->key() == Qt::Key_Backtab && (
 726                                 ke->modifiers() == Qt::ShiftModifier
 727                                 || ke->modifiers() == Qt::NoModifier))) {
 728                         keyPressEvent(ke);
 729                         return true;
 730                 }
 731                 return QAbstractScrollArea::event(e);
 732         }
 733
 734         default:
 735                 return QAbstractScrollArea::event(e);
 736         }
 737         return false;
 738 }
 739
 740
 741 void GuiWorkArea::contextMenuEvent(QContextMenuEvent * e)
 742 {
 743         string name;
 744         if (e->reason() == QContextMenuEvent::Mouse)
 745                 // the menu name is set on mouse press
 746                 name = d->context_menu_name_;
 747         else {
 748                 QPoint pos = e->pos();
 749                 Cursor const & cur = d->buffer_view_->cursor();
 750                 if (e->reason() == QContextMenuEvent::Keyboard && cur.inTexted()) {
 751                         // Do not access the context menu of math right in front of before
 752                         // the cursor. This does not work when the cursor is in text.
 753                         Inset * inset = cur.paragraph().getInset(cur.pos());
 754                         if (inset && inset->asInsetMath())
 755                                 --pos.rx();
 756                         else if (cur.pos() > 0) {
 757                                 Inset * inset = cur.paragraph().getInset(cur.pos() - 1);
 758                                 if (inset)
 759                                         ++pos.rx();
 760                         }
 761                 }
 762                 name = d->buffer_view_->contextMenu(pos.x(), pos.y());
 763         }
 764
 765         if (name.empty()) {
 766                 e->accept();
 767                 return;
 768         }
 769         // always show mnemonics when the keyboard is used to show the context menu
 770         // FIXME: This should be fixed in Qt itself
 771         bool const keyboard = (e->reason() == QContextMenuEvent::Keyboard);
 772         QMenu * menu = guiApp->menus().menu(toqstr(name), *d->lyx_view_, keyboard);
 773         if (!menu) {
 774                 e->accept();
 775                 return;
 776         }
 777         // Position the menu to the right.
 778         // FIXME: menu position should be different for RTL text.
 779         menu->exec(e->globalPos());
 780         e->accept();
 781 }
 782
 783
 784 void GuiWorkArea::focusInEvent(QFocusEvent * e)
 785 {
 786         LYXERR(Debug::DEBUG, "GuiWorkArea::focusInEvent(): " << this << endl);
 787         if (d->lyx_view_->currentWorkArea() != this) {
 788                 d->lyx_view_->setCurrentWorkArea(this);
 789                 d->lyx_view_->currentWorkArea()->bufferView().buffer().updateBuffer();
 790         }
 791
 792         startBlinkingCaret();
 793         QAbstractScrollArea::focusInEvent(e);
 794 }
 795
 796
 797 void GuiWorkArea::focusOutEvent(QFocusEvent * e)
 798 {
 799         LYXERR(Debug::DEBUG, "GuiWorkArea::focusOutEvent(): " << this << endl);
 800         stopBlinkingCaret();
 801         QAbstractScrollArea::focusOutEvent(e);
 802 }
 803
 804
 805 void GuiWorkArea::mousePressEvent(QMouseEvent * e)
 806 {
 807         if (d->dc_event_.active && d->dc_event_ == *e) {
 808                 d->dc_event_.active = false;
 809                 FuncRequest cmd(LFUN_MOUSE_TRIPLE, e->x(), e->y(),
 810                         q_button_state(e->button()), q_key_state(e->modifiers()));
 811                 d->dispatch(cmd);
 812                 e->accept();
 813                 return;
 814         }
 815
 816 #if (QT_VERSION < 0x050000) && !defined(__HAIKU__)
 817         inputContext()->reset();
 818 #endif
 819
 820         FuncRequest const cmd(LFUN_MOUSE_PRESS, e->x(), e->y(),
 821                         q_button_state(e->button()), q_key_state(e->modifiers()));
 822         d->dispatch(cmd);
 823
 824         // Save the context menu on mouse press, because also the mouse
 825         // cursor is set on mouse press. Afterwards, we can either release
 826         // the mousebutton somewhere else, or the cursor might have moved
 827         // due to the DEPM. We need to do this after the mouse has been
 828         // set in dispatch(), because the selection state might change.
 829         if (e->button() == Qt::RightButton)
 830                 d->context_menu_name_ = d->buffer_view_->contextMenu(e->x(), e->y());
 831
 832         e->accept();
 833 }
 834
 835
 836 void GuiWorkArea::mouseReleaseEvent(QMouseEvent * e)
 837 {
 838         if (d->synthetic_mouse_event_.timeout.running())
 839                 d->synthetic_mouse_event_.timeout.stop();
 840
 841         FuncRequest const cmd(LFUN_MOUSE_RELEASE, e->x(), e->y(),
 842                         q_button_state(e->button()), q_key_state(e->modifiers()));
 843         d->dispatch(cmd);
 844         e->accept();
 845 }
 846
 847
 848 void GuiWorkArea::mouseMoveEvent(QMouseEvent * e)
 849 {
 850         // we kill the triple click if we move
 851         doubleClickTimeout();
 852         FuncRequest cmd(LFUN_MOUSE_MOTION, e->x(), e->y(),
 853                         q_motion_state(e->buttons()), q_key_state(e->modifiers()));
 854
 855         e->accept();
 856
 857         // If we're above or below the work area...
 858         if ((e->y() <= 20 || e->y() >= viewport()->height() - 20)
 859                         && e->buttons() == mouse_button::button1) {
 860                 // Make sure only a synthetic event can cause a page scroll,
 861                 // so they come at a steady rate:
 862                 if (e->y() <= 20)
 863                         // _Force_ a scroll up:
 864                         cmd.set_y(e->y() - 21);
 865                 else
 866                         cmd.set_y(e->y() + 21);
 867                 // Store the event, to be handled when the timeout expires.
 868                 d->synthetic_mouse_event_.cmd = cmd;
 869
 870                 if (d->synthetic_mouse_event_.timeout.running()) {
 871                         // Discard the event. Note that it _may_ be handled
 872                         // when the timeout expires if
 873                         // synthetic_mouse_event_.cmd has not been overwritten.
 874                         // Ie, when the timeout expires, we handle the
 875                         // most recent event but discard all others that
 876                         // occurred after the one used to start the timeout
 877                         // in the first place.
 878                         return;
 879                 }
 880
 881                 d->synthetic_mouse_event_.restart_timeout = true;
 882                 d->synthetic_mouse_event_.timeout.start();
 883                 // Fall through to handle this event...
 884
 885         } else if (d->synthetic_mouse_event_.timeout.running()) {
 886                 // Store the event, to be possibly handled when the timeout
 887                 // expires.
 888                 // Once the timeout has expired, normal control is returned
 889                 // to mouseMoveEvent (restart_timeout = false).
 890                 // This results in a much smoother 'feel' when moving the
 891                 // mouse back into the work area.
 892                 d->synthetic_mouse_event_.cmd = cmd;
 893                 d->synthetic_mouse_event_.restart_timeout = false;
 894                 return;
 895         }
 896         d->dispatch(cmd);
 897 }
 898
 899
 900 void GuiWorkArea::wheelEvent(QWheelEvent * ev)
 901 {
 902         // Wheel rotation by one notch results in a delta() of 120 (see
 903         // documentation of QWheelEvent)
 904         double const delta = ev->delta() / 120.0;
 905         bool zoom = false;
 906         switch (lyxrc.scroll_wheel_zoom) {
 907         case LyXRC::SCROLL_WHEEL_ZOOM_CTRL:
 908                 zoom = ev->modifiers() & Qt::ControlModifier;
 909                 zoom &= !(ev->modifiers() & (Qt::ShiftModifier | Qt::AltModifier));
 910                 break;
 911         case LyXRC::SCROLL_WHEEL_ZOOM_SHIFT:
 912                 zoom = ev->modifiers() & Qt::ShiftModifier;
 913                 zoom &= !(ev->modifiers() & (Qt::ControlModifier | Qt::AltModifier));
 914                 break;
 915         case LyXRC::SCROLL_WHEEL_ZOOM_ALT:
 916                 zoom = ev->modifiers() & Qt::AltModifier;
 917                 zoom &= !(ev->modifiers() & (Qt::ShiftModifier | Qt::ControlModifier));
 918                 break;
 919         case LyXRC::SCROLL_WHEEL_ZOOM_OFF:
 920                 break;
 921         }
 922         if (zoom) {
 923                 docstring arg = convert<docstring>(int(5 * delta));
 924                 lyx::dispatch(FuncRequest(LFUN_BUFFER_ZOOM_IN, arg));
 925                 return;
 926         }
 927
 928         // Take into account the desktop wide settings.
 929         int const lines = qApp->wheelScrollLines();
 930         int const page_step = verticalScrollBar()->pageStep();
 931         // Test if the wheel mouse is set to one screen at a time.
 932         // This is according to
 933         // https://doc.qt.io/qt-5/qapplication.html#wheelScrollLines-prop
 934         int scroll_value =
 935                 min(lines * verticalScrollBar()->singleStep(), page_step);
 936
 937         // Take into account the rotation and the user preferences.
 938         scroll_value = int(scroll_value * delta * lyxrc.mouse_wheel_speed);
 939         LYXERR(Debug::SCROLLING, "wheelScrollLines = " << lines
 940                         << " delta = " << delta << " scroll_value = " << scroll_value
 941                         << " page_step = " << page_step);
 942         // Now scroll.
 943         verticalScrollBar()->setValue(verticalScrollBar()->value() - scroll_value);
 944
 945         ev->accept();
 946 }
 947
 948
 949 void GuiWorkArea::generateSyntheticMouseEvent()
 950 {
 951         int const e_y = d->synthetic_mouse_event_.cmd.y();
 952         int const wh = d->buffer_view_->workHeight();
 953         bool const up = e_y < 0;
 954         bool const down = e_y > wh;
 955
 956         // Set things off to generate the _next_ 'pseudo' event.
 957         int step = 50;
 958         if (d->synthetic_mouse_event_.restart_timeout) {
 959                 // This is some magic formulae to determine the speed
 960                 // of scrolling related to the position of the mouse.
 961                 int time = 200;
 962                 if (up || down) {
 963                         int dist = up ? -e_y : e_y - wh;
 964                         time = max(min(200, 250000 / (dist * dist)), 1) ;
 965
 966                         if (time < 40) {
 967                                 step = 80000 / (time * time);
 968                                 time = 40;
 969                         }
 970                 }
 971                 d->synthetic_mouse_event_.timeout.setTimeout(time);
 972                 d->synthetic_mouse_event_.timeout.start();
 973         }
 974
 975         // Can we scroll further ?
 976         int const value = verticalScrollBar()->value();
 977         if (value == verticalScrollBar()->maximum()
 978                   || value == verticalScrollBar()->minimum()) {
 979                 d->synthetic_mouse_event_.timeout.stop();
 980                 return;
 981         }
 982
 983         // Scroll
 984         if (step <= 2 * wh) {
 985                 d->buffer_view_->scroll(up ? -step : step);
 986                 d->buffer_view_->updateMetrics();
 987         } else {
 988                 d->buffer_view_->scrollDocView(value + (up ? -step : step), false);
 989         }
 990
 991         // In which paragraph do we have to set the cursor ?
 992         Cursor & cur = d->buffer_view_->cursor();
 993         // FIXME: we don't know how to handle math.
 994         Text * text = cur.text();
 995         if (!text)
 996                 return;
 997         TextMetrics const & tm = d->buffer_view_->textMetrics(text);
 998
 999         // Quit gracefully if there are no metrics, since otherwise next
1000         // line would crash (bug #10324).
1001         // This situation seems related to a (not yet understood) timing problem.
1002         if (tm.empty())
1003                 return;
1004
1005         pair<pit_type, const ParagraphMetrics *> pp = up ? tm.first() : tm.last();
1006         ParagraphMetrics const & pm = *pp.second;
1007         pit_type const pit = pp.first;
1008
1009         if (pm.rows().empty())
1010                 return;
1011
1012         // Find the row at which we set the cursor.
1013         RowList::const_iterator rit = pm.rows().begin();
1014         RowList::const_iterator rlast = pm.rows().end();
1015         int yy = pm.position() - pm.ascent();
1016         for (--rlast; rit != rlast; ++rit) {
1017                 int h = rit->height();
1018                 if ((up && yy + h > 0)
1019                           || (!up && yy + h > wh - defaultRowHeight()))
1020                         break;
1021                 yy += h;
1022         }
1023
1024         // Find the position of the cursor
1025         bool bound;
1026         int x = d->synthetic_mouse_event_.cmd.x();
1027         pos_type const pos = tm.getPosNearX(*rit, x, bound);
1028
1029         // Set the cursor
1030         cur.pit() = pit;
1031         cur.pos() = pos;
1032         cur.boundary(bound);
1033
1034         d->buffer_view_->buffer().changed(false);
1035         return;
1036 }
1037
1038
1039 void GuiWorkArea::keyPressEvent(QKeyEvent * ev)
1040 {
1041         // this is also called for ShortcutOverride events. In this case, one must
1042         // not act but simply accept the event explicitly.
1043         bool const act = (ev->type() != QEvent::ShortcutOverride);
1044
1045         // Do not process here some keys if dialog_mode_ is set
1046         if (d->dialog_mode_
1047                 && (ev->modifiers() == Qt::NoModifier
1048                     || ev->modifiers() == Qt::ShiftModifier)
1049                 && (ev->key() == Qt::Key_Escape
1050                     || ev->key() == Qt::Key_Enter
1051                     || ev->key() == Qt::Key_Return)
1052             ) {
1053                 ev->ignore();
1054                 return;
1055         }
1056
1057         // intercept some keys if completion popup is visible
1058         if (d->completer_->popupVisible()) {
1059                 switch (ev->key()) {
1060                 case Qt::Key_Enter:
1061                 case Qt::Key_Return:
1062                         if (act)
1063                                 d->completer_->activate();
1064                         ev->accept();
1065                         return;
1066                 }
1067         }
1068
1069         // do nothing if there are other events
1070         // (the auto repeated events come too fast)
1071         // it looks like this is only needed on X11
1072 #if defined(Q_WS_X11) || defined(QPA_XCB)
1073         // FIXME: this is a weird way to implement event compression. Also, this is
1074         // broken with IBus.
1075         if (act && qApp->hasPendingEvents() && ev->isAutoRepeat()) {
1076                 switch (ev->key()) {
1077                 case Qt::Key_PageDown:
1078                 case Qt::Key_PageUp:
1079                 case Qt::Key_Left:
1080                 case Qt::Key_Right:
1081                 case Qt::Key_Up:
1082                 case Qt::Key_Down:
1083                         LYXERR(Debug::KEY, "system is busy: scroll key event ignored");
1084                         ev->ignore();
1085                         return;
1086                 }
1087         }
1088 #endif
1089
1090         KeyModifier const m = q_key_state(ev->modifiers());
1091
1092         std::string str;
1093         if (m & ShiftModifier)
1094                 str += "Shift-";
1095         if (m & ControlModifier)
1096                 str += "Control-";
1097         if (m & AltModifier)
1098                 str += "Alt-";
1099         if (m & MetaModifier)
1100                 str += "Meta-";
1101
1102         if (act)
1103                 LYXERR(Debug::KEY, " count: " << ev->count() << " text: " << ev->text()
1104                        << " isAutoRepeat: " << ev->isAutoRepeat() << " key: " << ev->key()
1105                        << " keyState: " << str);
1106
1107         KeySymbol sym;
1108         setKeySymbol(&sym, ev);
1109         if (sym.isOK()) {
1110                 if (act) {
1111                         processKeySym(sym, m);
1112                         ev->accept();
1113                 } else
1114                         ev->setAccepted(queryKeySym(sym, m));
1115         } else {
1116                 ev->ignore();
1117         }
1118 }
1119
1120
1121 void GuiWorkArea::doubleClickTimeout()
1122 {
1123         d->dc_event_.active = false;
1124 }
1125
1126
1127 void GuiWorkArea::mouseDoubleClickEvent(QMouseEvent * ev)
1128 {
1129         d->dc_event_ = DoubleClick(ev);
1130         QTimer::singleShot(QApplication::doubleClickInterval(), this,
1131                         SLOT(doubleClickTimeout()));
1132         FuncRequest cmd(LFUN_MOUSE_DOUBLE, ev->x(), ev->y(),
1133                         q_button_state(ev->button()), q_key_state(ev->modifiers()));
1134         d->dispatch(cmd);
1135         ev->accept();
1136 }
1137
1138
1139 void GuiWorkArea::resizeEvent(QResizeEvent * ev)
1140 {
1141         QAbstractScrollArea::resizeEvent(ev);
1142         d->need_resize_ = true;
1143         ev->accept();
1144 }
1145
1146
1147 void GuiWorkArea::paintEvent(QPaintEvent * ev)
1148 {
1149         // LYXERR(Debug::PAINTING, "paintEvent begin: x: " << rc.x()
1150         //      << " y: " << rc.y() << " w: " << rc.width() << " h: " << rc.height());
1151
1152         if (d->needResize()) {
1153                 d->resizeBufferView();
1154                 if (d->caret_visible_) {
1155                         d->hideCaret();
1156                         d->showCaret();
1157                 }
1158         }
1159
1160         GuiPainter pain(viewport(), pixelRatio());
1161         d->buffer_view_->draw(pain, d->caret_visible_);
1162
1163         if (d->caret_visible_)
1164                 d->caret_->draw(pain);
1165         ev->accept();
1166 }
1167
1168
1169 void GuiWorkArea::inputMethodEvent(QInputMethodEvent * e)
1170 {
1171 //FIXME Broken Feature !!
1172 // I do not think that we are supposed to paint inside this event. Shall we
1173 // just let TextMetrics::breakRow add this to the relevant Row object?
1174 #if 0
1175         QString const & commit_string = e->commitString();
1176         docstring const & preedit_string
1177                 = qstring_to_ucs4(e->preeditString());
1178
1179         if (!commit_string.isEmpty()) {
1180
1181                 LYXERR(Debug::KEY, "preeditString: " << e->preeditString()
1182                         << " commitString: " << e->commitString());
1183
1184                 int key = 0;
1185
1186                 // FIXME Iwami 04/01/07: we should take care also of UTF16 surrogates here.
1187                 for (int i = 0; i != commit_string.size(); ++i) {
1188                         QKeyEvent ev(QEvent::KeyPress, key, Qt::NoModifier, commit_string[i]);
1189                         keyPressEvent(&ev);
1190                 }
1191         }
1192
1193         // Hide the cursor during the kana-kanji transformation.
1194         if (preedit_string.empty())
1195                 startBlinkingCaret();
1196         else
1197                 stopBlinkingCaret();
1198
1199         // last_width : for checking if last preedit string was/wasn't empty.
1200         // FIXME THREAD && FIXME
1201         // We could have more than one work area, right?
1202         static bool last_width = false;
1203         if (!last_width && preedit_string.empty()) {
1204                 // if last_width is last length of preedit string.
1205                 e->accept();
1206                 return;
1207         }
1208
1209         d->buffer_view_->updateMetrics();
1210         viewport()->update();
1211         // FIXME: shall we use real_current_font here? (see #10478)
1212         FontInfo font = d->buffer_view_->cursor().getFont().fontInfo();
1213         FontMetrics const & fm = theFontMetrics(font);
1214         int height = fm.maxHeight();
1215         int cur_x = d->caret_->rect().left();
1216         int cur_y = d->caret_->rect().bottom();
1217
1218         // redraw area of preedit string.
1219         viewport()->update(0, cur_y - height, viewport()->width(),
1220                 (height + 1) * d->preedit_lines_);
1221
1222         if (preedit_string.empty()) {
1223                 last_width = false;
1224                 d->preedit_lines_ = 1;
1225                 e->accept();
1226                 return;
1227         }
1228         last_width = true;
1229
1230         // att : stores an IM attribute.
1231         QList<QInputMethodEvent::Attribute> const & att = e->attributes();
1232
1233         // get attributes of input method cursor.
1234         // cursor_pos : cursor position in preedit string.
1235         size_t cursor_pos = 0;
1236         bool caret_is_visible = false;
1237         for (int i = 0; i != att.size(); ++i) {
1238                 if (att.at(i).type == QInputMethodEvent::Cursor) {
1239                         cursor_pos = att.at(i).start;
1240                         cursor_is_visible = att.at(i).length != 0;
1241                         break;
1242                 }
1243         }
1244
1245         size_t preedit_length = preedit_string.length();
1246
1247         // get position of selection in input method.
1248         // FIXME: isn't there a way to do this simplier?
1249         // rStart : cursor position in selected string in IM.
1250         size_t rStart = 0;
1251         // rLength : selected string length in IM.
1252         size_t rLength = 0;
1253         if (cursor_pos < preedit_length) {
1254                 for (int i = 0; i != att.size(); ++i) {
1255                         if (att.at(i).type == QInputMethodEvent::TextFormat) {
1256                                 if (att.at(i).start <= int(cursor_pos)
1257                                         && int(cursor_pos) < att.at(i).start + att.at(i).length) {
1258                                                 rStart = att.at(i).start;
1259                                                 rLength = att.at(i).length;
1260                                                 if (!cursor_is_visible)
1261                                                         cursor_pos += rLength;
1262                                                 break;
1263                                 }
1264                         }
1265                 }
1266         }
1267         else {
1268                 rStart = cursor_pos;
1269                 rLength = 0;
1270         }
1271
1272         int const right_margin = d->buffer_view_->rightMargin();
1273         Painter::preedit_style ps;
1274         // Most often there would be only one line:
1275         d->preedit_lines_ = 1;
1276         for (size_t pos = 0; pos != preedit_length; ++pos) {
1277                 char_type const typed_char = preedit_string[pos];
1278                 // reset preedit string style
1279                 ps = Painter::preedit_default;
1280
1281                 // if we reached the right extremity of the screen, go to next line.
1282                 if (cur_x + fm.width(typed_char) > viewport()->width() - right_margin) {
1283                         cur_x = right_margin;
1284                         cur_y += height + 1;
1285                         ++d->preedit_lines_;
1286                 }
1287                 // preedit strings are displayed with dashed underline
1288                 // and partial strings are displayed white on black indicating
1289                 // that we are in selecting mode in the input method.
1290                 // FIXME: rLength == preedit_length is not a changing condition
1291                 // FIXME: should be put out of the loop.
1292                 if (pos >= rStart
1293                         && pos < rStart + rLength
1294                         && !(cursor_pos < rLength && rLength == preedit_length))
1295                         ps = Painter::preedit_selecting;
1296
1297                 if (pos == cursor_pos
1298                         && (cursor_pos < rLength && rLength == preedit_length))
1299                         ps = Painter::preedit_cursor;
1300
1301                 // draw one character and update cur_x.
1302                 GuiPainter pain(d->screen_, pixelRatio());
1303                 cur_x += pain.preeditText(cur_x, cur_y, typed_char, font, ps);
1304         }
1305
1306         // update the preedit string screen area.
1307         viewport()->update(0, cur_y - d->preedit_lines_*height, viewport()->width(),
1308                 (height + 1) * d->preedit_lines_);
1309 #endif
1310
1311         // Don't forget to accept the event!
1312         e->accept();
1313 }
1314
1315
1316 QVariant GuiWorkArea::inputMethodQuery(Qt::InputMethodQuery query) const
1317 {
1318         QRect cur_r(0, 0, 0, 0);
1319         switch (query) {
1320                 // this is the CJK-specific composition window position and
1321                 // the context menu position when the menu key is pressed.
1322                 case Qt::ImMicroFocus:
1323                         cur_r = d->caret_->rect();
1324                         if (d->preedit_lines_ != 1)
1325                                 cur_r.moveLeft(10);
1326                         cur_r.moveBottom(cur_r.bottom()
1327                                 + cur_r.height() * (d->preedit_lines_ - 1));
1328                         // return lower right of cursor in LyX.
1329                         return cur_r;
1330                 default:
1331                         return QWidget::inputMethodQuery(query);
1332         }
1333 }
1334
1335
1336 void GuiWorkArea::updateWindowTitle()
1337 {
1338         Buffer const & buf = bufferView().buffer();
1339         if (buf.fileName() != d->file_name_
1340             || buf.params().shell_escape != d->shell_escape_
1341             || buf.hasReadonlyFlag() != d->read_only_
1342             || buf.lyxvc().vcstatus() != d->vc_status_
1343             || buf.isClean() != d->clean_
1344             || buf.notifiesExternalModification() != d->externally_modified_) {
1345                 d->file_name_ = buf.fileName();
1346                 d->shell_escape_ = buf.params().shell_escape;
1347                 d->read_only_ = buf.hasReadonlyFlag();
1348                 d->vc_status_ = buf.lyxvc().vcstatus();
1349                 d->clean_ = buf.isClean();
1350                 d->externally_modified_ = buf.notifiesExternalModification();
1351                 Q_EMIT titleChanged(this);
1352         }
1353 }
1354
1355
1356 bool GuiWorkArea::isFullScreen() const
1357 {
1358         return d->lyx_view_ && d->lyx_view_->isFullScreen();
1359 }
1360
1361
1362 void GuiWorkArea::scheduleRedraw()
1363 {
1364         d->schedule_redraw_ = true;
1365 }
1366
1367
1368 bool GuiWorkArea::inDialogMode() const
1369 {
1370         return d->dialog_mode_;
1371 }
1372
1373
1374 void GuiWorkArea::setDialogMode(bool mode)
1375 {
1376         d->dialog_mode_ = mode;
1377 }
1378
1379
1380 GuiCompleter & GuiWorkArea::completer()
1381 {
1382         return *d->completer_;
1383 }
1384
1385 GuiView const & GuiWorkArea::view() const
1386 {
1387         return *d->lyx_view_;
1388 }
1389
1390
1391 GuiView & GuiWorkArea::view()
1392 {
1393         return *d->lyx_view_;
1394 }
1395
1396 ////////////////////////////////////////////////////////////////////
1397 //
1398 // EmbeddedWorkArea
1399 //
1400 ////////////////////////////////////////////////////////////////////
1401
1402
1403 EmbeddedWorkArea::EmbeddedWorkArea(QWidget * w): GuiWorkArea(w)
1404 {
1405         support::TempFile tempfile("embedded.internal");
1406         tempfile.setAutoRemove(false);
1407         buffer_ = theBufferList().newInternalBuffer(tempfile.name().absFileName());
1408         buffer_->setUnnamed(true);
1409         buffer_->setFullyLoaded(true);
1410         setBuffer(*buffer_);
1411         setDialogMode(true);
1412 }
1413
1414
1415 EmbeddedWorkArea::~EmbeddedWorkArea()
1416 {
1417         // No need to destroy buffer and bufferview here, because it is done
1418         // in theBufferList() destruction loop at application exit
1419 }
1420
1421
1422 void EmbeddedWorkArea::closeEvent(QCloseEvent * ev)
1423 {
1424         disable();
1425         GuiWorkArea::closeEvent(ev);
1426 }
1427
1428
1429 void EmbeddedWorkArea::hideEvent(QHideEvent * ev)
1430 {
1431         disable();
1432         GuiWorkArea::hideEvent(ev);
1433 }
1434
1435
1436 QSize EmbeddedWorkArea::sizeHint () const
1437 {
1438         // FIXME(?):
1439         // GuiWorkArea sets the size to the screen's viewport
1440         // by returning a value this gets overridden
1441         // EmbeddedWorkArea is now sized to fit in the layout
1442         // of the parent, and has a minimum size set in GuiWorkArea
1443         // which is what we return here
1444         return QSize(100, 70);
1445 }
1446
1447
1448 void EmbeddedWorkArea::disable()
1449 {
1450         stopBlinkingCaret();
1451         if (view().currentWorkArea() != this)
1452                 return;
1453         // No problem if currentMainWorkArea() is 0 (setCurrentWorkArea()
1454         // tolerates it and shows the background logo), what happens if
1455         // an EmbeddedWorkArea is closed after closing all document WAs
1456         view().setCurrentWorkArea(view().currentMainWorkArea());
1457 }
1458
1459 ////////////////////////////////////////////////////////////////////
1460 //
1461 // TabWorkArea
1462 //
1463 ////////////////////////////////////////////////////////////////////
1464
1465 #ifdef Q_OS_MAC
1466 class NoTabFrameMacStyle : public QProxyStyle {
1467 public:
1468         ///
1469         QRect subElementRect(SubElement element, const QStyleOption * option,
1470                              const QWidget * widget = 0) const
1471         {
1472                 QRect rect = QProxyStyle::subElementRect(element, option, widget);
1473                 bool noBar = static_cast<QTabWidget const *>(widget)->count() <= 1;
1474
1475                 // The Qt Mac style puts the contents into a 3 pixel wide box
1476                 // which looks very ugly and not like other Mac applications.
1477                 // Hence we remove this here, and moreover the 16 pixel round
1478                 // frame above if the tab bar is hidden.
1479                 if (element == QStyle::SE_TabWidgetTabContents) {
1480                         rect.adjust(- rect.left(), 0, rect.left(), 0);
1481                         if (noBar)
1482                                 rect.setTop(0);
1483                 }
1484
1485                 return rect;
1486         }
1487 };
1488
1489 NoTabFrameMacStyle noTabFrameMacStyle;
1490 #endif
1491
1492
1493 TabWorkArea::TabWorkArea(QWidget * parent)
1494         : QTabWidget(parent), clicked_tab_(-1), midpressed_tab_(-1)
1495 {
1496 #ifdef Q_OS_MAC
1497         setStyle(&noTabFrameMacStyle);
1498 #endif
1499
1500         QPalette pal = palette();
1501         pal.setColor(QPalette::Active, QPalette::Button,
1502                 pal.color(QPalette::Active, QPalette::Window));
1503         pal.setColor(QPalette::Disabled, QPalette::Button,
1504                 pal.color(QPalette::Disabled, QPalette::Window));
1505         pal.setColor(QPalette::Inactive, QPalette::Button,
1506                 pal.color(QPalette::Inactive, QPalette::Window));
1507
1508         QObject::connect(this, SIGNAL(currentChanged(int)),
1509                 this, SLOT(on_currentTabChanged(int)));
1510
1511         closeBufferButton = new QToolButton(this);
1512         closeBufferButton->setPalette(pal);
1513         // FIXME: rename the icon to closebuffer.png
1514         closeBufferButton->setIcon(QIcon(getPixmap("images/", "closetab", "svgz,png")));
1515         closeBufferButton->setText("Close File");
1516         closeBufferButton->setAutoRaise(true);
1517         closeBufferButton->setCursor(Qt::ArrowCursor);
1518         closeBufferButton->setToolTip(qt_("Close File"));
1519         closeBufferButton->setEnabled(true);
1520         QObject::connect(closeBufferButton, SIGNAL(clicked()),
1521                 this, SLOT(closeCurrentBuffer()));
1522         setCornerWidget(closeBufferButton, Qt::TopRightCorner);
1523
1524         // setup drag'n'drop
1525         QTabBar* tb = new DragTabBar;
1526         connect(tb, SIGNAL(tabMoveRequested(int, int)),
1527                 this, SLOT(moveTab(int, int)));
1528         tb->setElideMode(Qt::ElideNone);
1529         setTabBar(tb);
1530
1531         // make us responsible for the context menu of the tabbar
1532         tb->setContextMenuPolicy(Qt::CustomContextMenu);
1533         connect(tb, SIGNAL(customContextMenuRequested(const QPoint &)),
1534                 this, SLOT(showContextMenu(const QPoint &)));
1535         connect(tb, SIGNAL(tabCloseRequested(int)),
1536                 this, SLOT(closeTab(int)));
1537
1538         setUsesScrollButtons(true);
1539 }
1540
1541
1542 void TabWorkArea::mousePressEvent(QMouseEvent *me)
1543 {
1544         if (me->button() == Qt::MidButton)
1545                 midpressed_tab_ = tabBar()->tabAt(me->pos());
1546         else
1547                 QTabWidget::mousePressEvent(me);
1548 }
1549
1550
1551 void TabWorkArea::mouseReleaseEvent(QMouseEvent *me)
1552 {
1553         if (me->button() == Qt::MidButton) {
1554                 int const midreleased_tab = tabBar()->tabAt(me->pos());
1555                 if (midpressed_tab_ == midreleased_tab && posIsTab(me->pos()))
1556                         closeTab(midreleased_tab);
1557         } else
1558                 QTabWidget::mouseReleaseEvent(me);
1559 }
1560
1561
1562 void TabWorkArea::paintEvent(QPaintEvent * event)
1563 {
1564         if (tabBar()->isVisible()) {
1565                 QTabWidget::paintEvent(event);
1566         } else {
1567                 // Prevent the selected tab to influence the
1568                 // painting of the frame of the tab widget.
1569                 // This is needed for gtk style in Qt.
1570                 QStylePainter p(this);
1571 #if QT_VERSION < 0x050000
1572                 QStyleOptionTabWidgetFrameV2 opt;
1573 #else
1574                 QStyleOptionTabWidgetFrame opt;
1575 #endif
1576                 initStyleOption(&opt);
1577                 opt.rect = style()->subElementRect(QStyle::SE_TabWidgetTabPane,
1578                         &opt, this);
1579                 opt.selectedTabRect = QRect();
1580                 p.drawPrimitive(QStyle::PE_FrameTabWidget, opt);
1581         }
1582 }
1583
1584
1585 bool TabWorkArea::posIsTab(QPoint position)
1586 {
1587         // tabAt returns -1 if tab does not covers position
1588         return tabBar()->tabAt(position) > -1;
1589 }
1590
1591
1592 void TabWorkArea::mouseDoubleClickEvent(QMouseEvent * event)
1593 {
1594         if (event->button() != Qt::LeftButton)
1595                 return;
1596
1597         // this code chunk is unnecessary because it seems the event only makes
1598         // it this far if it is not on a tab. I'm not sure why this is (maybe
1599         // it is handled and ended in DragTabBar?), and thus I'm not sure if
1600         // this is true in all cases and if it will be true in the future so I
1601         // leave this code for now. (skostysh, 2016-07-21)
1602         //
1603         // return early if double click on existing tabs
1604         if (posIsTab(event->pos()))
1605                 return;
1606
1607         dispatch(FuncRequest(LFUN_BUFFER_NEW));
1608 }
1609
1610
1611 void TabWorkArea::setFullScreen(bool full_screen)
1612 {
1613         for (int i = 0; i != count(); ++i) {
1614                 if (GuiWorkArea * wa = workArea(i))
1615                         wa->setFullScreen(full_screen);
1616         }
1617
1618         if (lyxrc.full_screen_tabbar)
1619                 showBar(!full_screen && count() > 1);
1620         else
1621                 showBar(count() > 1);
1622 }
1623
1624
1625 void TabWorkArea::showBar(bool show)
1626 {
1627         tabBar()->setEnabled(show);
1628         tabBar()->setVisible(show);
1629         closeBufferButton->setVisible(show && lyxrc.single_close_tab_button);
1630         setTabsClosable(!lyxrc.single_close_tab_button);
1631 }
1632
1633
1634 GuiWorkAreaContainer * TabWorkArea::widget(int index) const
1635 {
1636         QWidget * w = QTabWidget::widget(index);
1637         if (!w)
1638                 return nullptr;
1639         GuiWorkAreaContainer * wac = dynamic_cast<GuiWorkAreaContainer *>(w);
1640         LATTEST(wac);
1641         return wac;
1642 }
1643
1644
1645 GuiWorkAreaContainer * TabWorkArea::currentWidget() const
1646 {
1647         return widget(currentIndex());
1648 }
1649
1650
1651 GuiWorkArea * TabWorkArea::workArea(int index) const
1652 {
1653         GuiWorkAreaContainer * w = widget(index);
1654         if (!w)
1655                 return nullptr;
1656         return w->workArea();
1657 }
1658
1659
1660 GuiWorkArea * TabWorkArea::currentWorkArea() const
1661 {
1662         return workArea(currentIndex());
1663 }
1664
1665
1666 GuiWorkArea * TabWorkArea::workArea(Buffer & buffer) const
1667 {
1668         // FIXME: this method doesn't work if we have more than one work area
1669         // showing the same buffer.
1670         for (int i = 0; i != count(); ++i) {
1671                 GuiWorkArea * wa = workArea(i);
1672                 LASSERT(wa, return 0);
1673                 if (&wa->bufferView().buffer() == &buffer)
1674                         return wa;
1675         }
1676         return 0;
1677 }
1678
1679
1680 void TabWorkArea::closeAll()
1681 {
1682         while (count()) {
1683                 QWidget * wac = widget(0);
1684                 LASSERT(wac, return);
1685                 removeTab(0);
1686                 delete wac;
1687         }
1688 }
1689
1690
1691 int TabWorkArea::indexOfWorkArea(GuiWorkArea * w) const
1692 {
1693         for (int index = 0; index < count(); ++index)
1694                 if (workArea(index) == w)
1695                         return index;
1696         return -1;
1697 }
1698
1699
1700 bool TabWorkArea::setCurrentWorkArea(GuiWorkArea * work_area)
1701 {
1702         LASSERT(work_area, return false);
1703         int index = indexOfWorkArea(work_area);
1704         if (index == -1)
1705                 return false;
1706
1707         if (index == currentIndex())
1708                 // Make sure the work area is up to date.
1709                 on_currentTabChanged(index);
1710         else
1711                 // Switch to the work area.
1712                 setCurrentIndex(index);
1713         work_area->setFocus();
1714
1715         return true;
1716 }
1717
1718
1719 GuiWorkArea * TabWorkArea::addWorkArea(Buffer & buffer, GuiView & view)
1720 {
1721         GuiWorkArea * wa = new GuiWorkArea(buffer, view);
1722         GuiWorkAreaContainer * wac = new GuiWorkAreaContainer(wa);
1723         wa->setUpdatesEnabled(false);
1724         // Hide tabbar if there's no tab (avoid a resize and a flashing tabbar
1725         // when hiding it again below).
1726         if (!(currentWorkArea() && currentWorkArea()->isFullScreen()))
1727                 showBar(count() > 0);
1728         addTab(wac, wa->windowTitle());
1729         QObject::connect(wa, SIGNAL(titleChanged(GuiWorkArea *)),
1730                 this, SLOT(updateTabTexts()));
1731         if (currentWorkArea() && currentWorkArea()->isFullScreen())
1732                 setFullScreen(true);
1733         else
1734                 // Hide tabbar if there's only one tab.
1735                 showBar(count() > 1);
1736
1737         updateTabTexts();
1738
1739         return wa;
1740 }
1741
1742
1743 bool TabWorkArea::removeWorkArea(GuiWorkArea * work_area)
1744 {
1745         LASSERT(work_area, return false);
1746         int index = indexOfWorkArea(work_area);
1747         if (index == -1)
1748                 return false;
1749
1750         work_area->setUpdatesEnabled(false);
1751         QWidget * wac = widget(index);
1752         removeTab(index);
1753         delete wac;
1754
1755         if (count()) {
1756                 // make sure the next work area is enabled.
1757                 currentWidget()->setUpdatesEnabled(true);
1758                 if (currentWorkArea() && currentWorkArea()->isFullScreen())
1759                         setFullScreen(true);
1760                 else
1761                         // Show tabbar only if there's more than one tab.
1762                         showBar(count() > 1);
1763         } else
1764                 lastWorkAreaRemoved();
1765
1766         updateTabTexts();
1767
1768         return true;
1769 }
1770
1771
1772 void TabWorkArea::on_currentTabChanged(int i)
1773 {
1774         // returns e.g. on application destruction
1775         if (i == -1)
1776                 return;
1777         GuiWorkArea * wa = workArea(i);
1778         LASSERT(wa, return);
1779         wa->setUpdatesEnabled(true);
1780         wa->redraw(true);
1781         wa->setFocus();
1782         ///
1783         currentWorkAreaChanged(wa);
1784
1785         LYXERR(Debug::GUI, "currentTabChanged " << i
1786                 << " File: " << wa->bufferView().buffer().absFileName());
1787 }
1788
1789
1790 void TabWorkArea::closeCurrentBuffer()
1791 {
1792         GuiWorkArea * wa;
1793         if (clicked_tab_ == -1)
1794                 wa = currentWorkArea();
1795         else {
1796                 wa = workArea(clicked_tab_);
1797                 LASSERT(wa, return);
1798         }
1799         wa->view().closeWorkArea(wa);
1800 }
1801
1802
1803 void TabWorkArea::hideCurrentTab()
1804 {
1805         GuiWorkArea * wa;
1806         if (clicked_tab_ == -1)
1807                 wa = currentWorkArea();
1808         else {
1809                 wa = workArea(clicked_tab_);
1810                 LASSERT(wa, return);
1811         }
1812         wa->view().hideWorkArea(wa);
1813 }
1814
1815
1816 void TabWorkArea::closeTab(int index)
1817 {
1818         on_currentTabChanged(index);
1819         GuiWorkArea * wa;
1820         if (index == -1)
1821                 wa = currentWorkArea();
1822         else {
1823                 wa = workArea(index);
1824                 LASSERT(wa, return);
1825         }
1826         wa->view().closeWorkArea(wa);
1827 }
1828
1829
1830 ///
1831 class DisplayPath {
1832 public:
1833         /// make vector happy
1834         DisplayPath() : tab_(-1), dottedPrefix_(false) {}
1835         ///
1836         DisplayPath(int tab, FileName const & filename)
1837                 : tab_(tab)
1838         {
1839                 filename_ = (filename.extension() == "lyx") ?
1840                         toqstr(filename.onlyFileNameWithoutExt())
1841                         : toqstr(filename.onlyFileName());
1842                 postfix_ = toqstr(filename.absoluteFilePath()).
1843                         split("/", QString::SkipEmptyParts);
1844                 postfix_.pop_back();
1845                 abs_ = toqstr(filename.absoluteFilePath());
1846                 dottedPrefix_ = false;
1847         }
1848
1849         /// Absolute path for debugging.
1850         QString abs() const
1851         {
1852                 return abs_;
1853         }
1854         /// Add the first segment from the postfix or three dots to the prefix.
1855         /// Merge multiple dot tripples. In fact dots are added lazily, i.e. only
1856         /// when really needed.
1857         void shiftPathSegment(bool dotted)
1858         {
1859                 if (postfix_.count() <= 0)
1860                         return;
1861
1862                 if (!dotted) {
1863                         if (dottedPrefix_ && !prefix_.isEmpty())
1864                                 prefix_ += ellipsisSlash_;
1865                         prefix_ += postfix_.front() + "/";
1866                 }
1867                 dottedPrefix_ = dotted && !prefix_.isEmpty();
1868                 postfix_.pop_front();
1869         }
1870         ///
1871         QString displayString() const
1872         {
1873                 if (prefix_.isEmpty())
1874                         return filename_;
1875
1876                 bool dots = dottedPrefix_ || !postfix_.isEmpty();
1877                 return prefix_ + (dots ? ellipsisSlash_ : "") + filename_;
1878         }
1879         ///
1880         QString forecastPathString() const
1881         {
1882                 if (postfix_.count() == 0)
1883                         return displayString();
1884
1885                 return prefix_
1886                         + (dottedPrefix_ ? ellipsisSlash_ : "")
1887                         + postfix_.front() + "/";
1888         }
1889         ///
1890         bool final() const { return postfix_.empty(); }
1891         ///
1892         int tab() const { return tab_; }
1893
1894 private:
1895         /// ".../"
1896         static QString const ellipsisSlash_;
1897         ///
1898         QString prefix_;
1899         ///
1900         QStringList postfix_;
1901         ///
1902         QString filename_;
1903         ///
1904         QString abs_;
1905         ///
1906         int tab_;
1907         ///
1908         bool dottedPrefix_;
1909 };
1910
1911
1912 QString const DisplayPath::ellipsisSlash_ = QString(QChar(0x2026)) + "/";
1913
1914
1915 ///
1916 bool operator<(DisplayPath const & a, DisplayPath const & b)
1917 {
1918         return a.displayString() < b.displayString();
1919 }
1920
1921 ///
1922 bool operator==(DisplayPath const & a, DisplayPath const & b)
1923 {
1924         return a.displayString() == b.displayString();
1925 }
1926
1927
1928 void TabWorkArea::updateTabTexts()
1929 {
1930         size_t n = count();
1931         if (n == 0)
1932                 return;
1933         std::list<DisplayPath> paths;
1934         typedef std::list<DisplayPath>::iterator It;
1935
1936         // collect full names first: path into postfix, empty prefix and
1937         // filename without extension
1938         for (size_t i = 0; i < n; ++i) {
1939                 GuiWorkArea * i_wa = workArea(i);
1940                 FileName const fn = i_wa->bufferView().buffer().fileName();
1941                 paths.push_back(DisplayPath(i, fn));
1942         }
1943
1944         // go through path segments and see if it helps to make the path more unique
1945         bool somethingChanged = true;
1946         bool allFinal = false;
1947         while (somethingChanged && !allFinal) {
1948                 // adding path segments changes order
1949                 paths.sort();
1950
1951                 LYXERR(Debug::GUI, "updateTabTexts() iteration start");
1952                 somethingChanged = false;
1953                 allFinal = true;
1954
1955                 // find segments which are not unique (i.e. non-atomic)
1956                 It it = paths.begin();
1957                 It segStart = it;
1958                 QString segString = it->displayString();
1959                 for (; it != paths.end(); ++it) {
1960                         // look to the next item
1961                         It next = it;
1962                         ++next;
1963
1964                         // final?
1965                         allFinal = allFinal && it->final();
1966
1967                         LYXERR(Debug::GUI, "it = " << it->abs()
1968                                << " => " << it->displayString());
1969
1970                         // still the same segment?
1971                         QString nextString;
1972                         if ((next != paths.end()
1973                              && (nextString = next->displayString()) == segString))
1974                                 continue;
1975                         LYXERR(Debug::GUI, "segment ended");
1976
1977                         // only a trivial one with one element?
1978                         if (it == segStart) {
1979                                 // start new segment
1980                                 segStart = next;
1981                                 segString = nextString;
1982                                 continue;
1983                         }
1984
1985                         // We found a non-atomic segment
1986                         // We know that segStart <= it < next <= paths.end().
1987                         // The assertion below tells coverity about it.
1988                         LATTEST(segStart != paths.end());
1989                         QString dspString = segStart->forecastPathString();
1990                         LYXERR(Debug::GUI, "first forecast found for "
1991                                << segStart->abs() << " => " << dspString);
1992                         It sit = segStart;
1993                         ++sit;
1994                         // Shift path segments and hope for the best
1995                         // that it makes the path more unique.
1996                         somethingChanged = true;
1997                         bool moreUnique = false;
1998                         for (; sit != next; ++sit) {
1999                                 if (sit->forecastPathString() != dspString) {
2000                                         LYXERR(Debug::GUI, "different forecast found for "
2001                                                 << sit->abs() << " => " << sit->forecastPathString());
2002                                         moreUnique = true;
2003                                         break;
2004                                 }
2005                                 LYXERR(Debug::GUI, "same forecast found for "
2006                                         << sit->abs() << " => " << dspString);
2007                         }
2008
2009                         // if the path segment helped, add it. Otherwise add dots
2010                         bool dots = !moreUnique;
2011                         LYXERR(Debug::GUI, "using dots = " << dots);
2012                         for (sit = segStart; sit != next; ++sit) {
2013                                 sit->shiftPathSegment(dots);
2014                                 LYXERR(Debug::GUI, "shifting "
2015                                         << sit->abs() << " => " << sit->displayString());
2016                         }
2017
2018                         // start new segment
2019                         segStart = next;
2020                         segString = nextString;
2021                 }
2022         }
2023
2024         // set new tab titles
2025         for (It it = paths.begin(); it != paths.end(); ++it) {
2026                 int const tab_index = it->tab();
2027                 Buffer const & buf = workArea(tab_index)->bufferView().buffer();
2028                 QString tab_text = it->displayString().replace("&", "&&");
2029                 if (!buf.fileName().empty() && !buf.isClean())
2030                         tab_text += "*";
2031                 QString tab_tooltip = it->abs();
2032                 if (buf.hasReadonlyFlag()) {
2033                         setTabIcon(tab_index, QIcon(getPixmap("images/", "emblem-readonly", "svgz,png")));
2034                         tab_tooltip = qt_("%1 (read only)").arg(tab_tooltip);
2035                 } else
2036                         setTabIcon(tab_index, QIcon());
2037                 if (buf.notifiesExternalModification()) {
2038                         QString const warn = qt_("%1 (modified externally)");
2039                         tab_tooltip = warn.arg(tab_tooltip);
2040                         tab_text += QChar(0x26a0);
2041                 }
2042                 setTabText(tab_index, tab_text);
2043                 setTabToolTip(tab_index, tab_tooltip);
2044         }
2045 }
2046
2047
2048 void TabWorkArea::showContextMenu(const QPoint & pos)
2049 {
2050         // which tab?
2051         clicked_tab_ = static_cast<DragTabBar *>(tabBar())->tabAt(pos);
2052         if (clicked_tab_ == -1)
2053                 return;
2054
2055         // show tab popup
2056         QMenu popup;
2057         popup.addAction(QIcon(getPixmap("images/", "hidetab", "svgz,png")),
2058                 qt_("Hide tab"), this, SLOT(hideCurrentTab()));
2059         popup.addAction(QIcon(getPixmap("images/", "closetab", "svgz,png")),
2060                 qt_("Close tab"), this, SLOT(closeCurrentBuffer()));
2061         popup.exec(tabBar()->mapToGlobal(pos));
2062
2063         clicked_tab_ = -1;
2064 }
2065
2066
2067 void TabWorkArea::moveTab(int fromIndex, int toIndex)
2068 {
2069         QWidget * w = widget(fromIndex);
2070         QIcon icon = tabIcon(fromIndex);
2071         QString text = tabText(fromIndex);
2072
2073         setCurrentIndex(fromIndex);
2074         removeTab(fromIndex);
2075         insertTab(toIndex, w, icon, text);
2076         setCurrentIndex(toIndex);
2077 }
2078
2079
2080 DragTabBar::DragTabBar(QWidget* parent)
2081         : QTabBar(parent)
2082 {
2083         setAcceptDrops(true);
2084         setTabsClosable(!lyxrc.single_close_tab_button);
2085 }
2086
2087
2088 void DragTabBar::mousePressEvent(QMouseEvent * event)
2089 {
2090         if (event->button() == Qt::LeftButton)
2091                 dragStartPos_ = event->pos();
2092         QTabBar::mousePressEvent(event);
2093 }
2094
2095
2096 void DragTabBar::mouseMoveEvent(QMouseEvent * event)
2097 {
2098         // If the left button isn't pressed anymore then return
2099         if (!(event->buttons() & Qt::LeftButton))
2100                 return;
2101
2102         // If the distance is too small then return
2103         if ((event->pos() - dragStartPos_).manhattanLength()
2104             < QApplication::startDragDistance())
2105                 return;
2106
2107         // did we hit something after all?
2108         int tab = tabAt(dragStartPos_);
2109         if (tab == -1)
2110                 return;
2111
2112         // simulate button release to remove highlight from button
2113         int i = currentIndex();
2114         QMouseEvent me(QEvent::MouseButtonRelease, dragStartPos_,
2115                 event->button(), event->buttons(), 0);
2116         QTabBar::mouseReleaseEvent(&me);
2117         setCurrentIndex(i);
2118
2119         // initiate Drag
2120         QDrag * drag = new QDrag(this);
2121         QMimeData * mimeData = new QMimeData;
2122         // a crude way to distinguish tab-reodering drops from other ones
2123         mimeData->setData("action", "tab-reordering") ;
2124         drag->setMimeData(mimeData);
2125
2126         // get tab pixmap as cursor
2127         QRect r = tabRect(tab);
2128         QPixmap pixmap(r.size());
2129         render(&pixmap, - r.topLeft());
2130         drag->setPixmap(pixmap);
2131         drag->exec();
2132 }
2133
2134
2135 void DragTabBar::dragEnterEvent(QDragEnterEvent * event)
2136 {
2137         // Only accept if it's an tab-reordering request
2138         QMimeData const * m = event->mimeData();
2139         QStringList formats = m->formats();
2140         if (formats.contains("action")
2141             && m->data("action") == "tab-reordering")
2142                 event->acceptProposedAction();
2143 }
2144
2145
2146 void DragTabBar::dropEvent(QDropEvent * event)
2147 {
2148         int fromIndex = tabAt(dragStartPos_);
2149         int toIndex = tabAt(event->pos());
2150
2151         // Tell interested objects that
2152         if (fromIndex != toIndex)
2153                 tabMoveRequested(fromIndex, toIndex);
2154         event->acceptProposedAction();
2155 }
2156
2157
2158 GuiWorkAreaContainer::GuiWorkAreaContainer(GuiWorkArea * wa, QWidget * parent)
2159         : QWidget(parent), wa_(wa)
2160 {
2161         LASSERT(wa, return);
2162         Ui::WorkAreaUi::setupUi(this);
2163         layout()->addWidget(wa);
2164         connect(wa, SIGNAL(titleChanged(GuiWorkArea *)),
2165                 this, SLOT(updateDisplay()));
2166         connect(reloadPB, SIGNAL(clicked()), this, SLOT(reload()));
2167         connect(ignorePB, SIGNAL(clicked()), this, SLOT(ignore()));
2168         setMessageColour({notificationFrame}, {reloadPB, ignorePB});
2169         updateDisplay();
2170 }
2171
2172
2173 void GuiWorkAreaContainer::updateDisplay()
2174 {
2175         Buffer const & buf = wa_->bufferView().buffer();
2176         notificationFrame->setHidden(!buf.notifiesExternalModification());
2177         QString const label = qt_("<b>The file %1 changed on disk.</b>")
2178                 .arg(toqstr(buf.fileName().displayName()));
2179         externalModificationLabel->setText(label);
2180 }
2181
2182
2183 void GuiWorkAreaContainer::dispatch(FuncRequest f) const
2184 {
2185         lyx::dispatch(FuncRequest(LFUN_BUFFER_SWITCH,
2186                                   wa_->bufferView().buffer().absFileName()));
2187         lyx::dispatch(f);
2188 }
2189
2190
2191 void GuiWorkAreaContainer::reload() const
2192 {
2193         dispatch(FuncRequest(LFUN_BUFFER_RELOAD));
2194 }
2195
2196
2197 void GuiWorkAreaContainer::ignore() const
2198 {
2199         dispatch(FuncRequest(LFUN_BUFFER_EXTERNAL_MODIFICATION_CLEAR));
2200 }
2201
2202
2203 void GuiWorkAreaContainer::mouseDoubleClickEvent(QMouseEvent * event)
2204 {
2205         // prevent TabWorkArea from opening a new buffer on double click
2206         event->accept();
2207 }
2208
2209
2210 } // namespace frontend
2211 } // namespace lyx
2212
2213 #include "moc_GuiWorkArea.cpp"