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/lassert.h"
  51 #include "support/TempFile.h"
  52
  53 #include "frontends/Application.h"
  54 #include "frontends/FontMetrics.h"
  55 #include "frontends/WorkAreaManager.h"
  56
  57 #include <QContextMenuEvent>
  58 #if (QT_VERSION < 0x050000)
  59 #include <QInputContext>
  60 #endif
  61 #include <QDrag>
  62 #include <QHelpEvent>
  63 #ifdef Q_OS_MAC
  64 #include <QProxyStyle>
  65 #endif
  66 #include <QMainWindow>
  67 #include <QMimeData>
  68 #include <QMenu>
  69 #include <QPainter>
  70 #include <QPalette>
  71 #include <QPixmapCache>
  72 #include <QScrollBar>
  73 #include <QStyleOption>
  74 #include <QStylePainter>
  75 #include <QTimer>
  76 #include <QToolButton>
  77 #include <QToolTip>
  78 #include <QMenuBar>
  79
  80 #include "support/bind.h"
  81
  82 #include <cmath>
  83 #include <iostream>
  84
  85 int const TabIndicatorWidth = 3;
  86
  87 #undef KeyPress
  88 #undef NoModifier
  89
  90 using namespace std;
  91 using namespace lyx::support;
  92
  93 namespace lyx {
  94
  95
  96 /// return the LyX mouse button state from Qt's
  97 static mouse_button::state q_button_state(Qt::MouseButton button)
  98 {
  99         mouse_button::state b = mouse_button::none;
 100         switch (button) {
 101                 case Qt::LeftButton:
 102                         b = mouse_button::button1;
 103                         break;
 104                 case Qt::MidButton:
 105                         b = mouse_button::button2;
 106                         break;
 107                 case Qt::RightButton:
 108                         b = mouse_button::button3;
 109                         break;
 110                 default:
 111                         break;
 112         }
 113         return b;
 114 }
 115
 116
 117 /// return the LyX mouse button state from Qt's
 118 mouse_button::state q_motion_state(Qt::MouseButtons state)
 119 {
 120         mouse_button::state b = mouse_button::none;
 121         if (state & Qt::LeftButton)
 122                 b |= mouse_button::button1;
 123         if (state & Qt::MidButton)
 124                 b |= mouse_button::button2;
 125         if (state & Qt::RightButton)
 126                 b |= mouse_button::button3;
 127         return b;
 128 }
 129
 130
 131 namespace frontend {
 132
 133 class CursorWidget {
 134 public:
 135         CursorWidget() : rtl_(false), l_shape_(false), completable_(false),
 136                 show_(false), x_(0), cursor_width_(0)
 137         {
 138                 recomputeWidth();
 139         }
 140
 141         void draw(QPainter & painter)
 142         {
 143                 if (!show_ || !rect_.isValid())
 144                         return;
 145
 146                 int y = rect_.top();
 147                 int l = x_ - rect_.left();
 148                 int r = rect_.right() - x_;
 149                 int bot = rect_.bottom();
 150
 151                 // draw vertical line
 152                 painter.fillRect(x_, y, cursor_width_, rect_.height(), color_);
 153
 154                 // draw RTL/LTR indication
 155                 painter.setPen(color_);
 156                 if (l_shape_) {
 157                         if (rtl_)
 158                                 painter.drawLine(x_, bot, x_ - l, bot);
 159                         else
 160                                 painter.drawLine(x_, bot, x_ + cursor_width_ + r, bot);
 161                 }
 162
 163                 // draw completion triangle
 164                 if (completable_) {
 165                         int m = y + rect_.height() / 2;
 166                         int d = TabIndicatorWidth - 1;
 167                         if (rtl_) {
 168                                 painter.drawLine(x_ - 1, m - d, x_ - 1 - d, m);
 169                                 painter.drawLine(x_ - 1, m + d, x_ - 1 - d, m);
 170                         } else {
 171                                 painter.drawLine(x_ + cursor_width_, m - d, x_ + cursor_width_ + d, m);
 172                                 painter.drawLine(x_ + cursor_width_, m + d, x_ + cursor_width_ + d, m);
 173                         }
 174                 }
 175         }
 176
 177         void update(int x, int y, int h, bool l_shape,
 178                 bool rtl, bool completable)
 179         {
 180                 color_ = guiApp->colorCache().get(Color_cursor);
 181                 l_shape_ = l_shape;
 182                 rtl_ = rtl;
 183                 completable_ = completable;
 184                 x_ = x;
 185
 186                 // extension to left and right
 187                 int l = 0;
 188                 int r = 0;
 189
 190                 // RTL/LTR indication
 191                 if (l_shape_) {
 192                         if (rtl)
 193                                 l += h / 3;
 194                         else
 195                                 r += h / 3;
 196                 }
 197
 198                 // completion triangle
 199                 if (completable_) {
 200                         if (rtl)
 201                                 l = max(l, TabIndicatorWidth);
 202                         else
 203                                 r = max(r, TabIndicatorWidth);
 204                 }
 205
 206                 // compute overall rectangle
 207                 rect_ = QRect(x - l, y, cursor_width_ + r + l, h);
 208         }
 209
 210         void show(bool set_show = true) { show_ = set_show; }
 211         void hide() { show_ = false; }
 212         int cursorWidth() const { return cursor_width_; }
 213         void recomputeWidth() {
 214                 cursor_width_ = lyxrc.cursor_width
 215                         ? lyxrc.cursor_width
 216                         : 1 + int((lyxrc.currentZoom + 50) / 200.0);
 217         }
 218
 219         QRect const & rect() { return rect_; }
 220
 221 private:
 222         /// cursor is in RTL or LTR text
 223         bool rtl_;
 224         /// indication for RTL or LTR
 225         bool l_shape_;
 226         /// triangle to show that a completion is available
 227         bool completable_;
 228         ///
 229         bool show_;
 230         ///
 231         QColor color_;
 232         /// rectangle, possibly with l_shape and completion triangle
 233         QRect rect_;
 234         /// x position (were the vertical line is drawn)
 235         int x_;
 236
 237         int cursor_width_;
 238 };
 239
 240
 241 // This is a 'heartbeat' generating synthetic mouse move events when the
 242 // cursor is at the top or bottom edge of the viewport. One scroll per 0.2 s
 243 SyntheticMouseEvent::SyntheticMouseEvent()
 244         : timeout(200), restart_timeout(true)
 245 {}
 246
 247
 248 GuiWorkArea::Private::Private(GuiWorkArea * parent)
 249 : p(parent), screen_(0), buffer_view_(0), lyx_view_(0),
 250   cursor_visible_(false), cursor_(0),
 251   need_resize_(false), schedule_redraw_(false), preedit_lines_(1),
 252   pixel_ratio_(1.0),
 253   completer_(new GuiCompleter(p, p)), dialog_mode_(false), shell_escape_(false),
 254   read_only_(false), clean_(true), externally_modified_(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         new CompressorProxy(this); // not a leak
 269         setGuiView(gv);
 270         buffer.params().display_pixel_ratio = theGuiApp()->pixelRatio();
 271         setBuffer(buffer);
 272         init();
 273 }
 274
 275
 276 double GuiWorkArea::pixelRatio() const
 277 {
 278 #if QT_VERSION >= 0x050000
 279         return qt_scale_factor * devicePixelRatio();
 280 #else
 281         return 1.0;
 282 #endif
 283 }
 284
 285
 286 void GuiWorkArea::init()
 287 {
 288         // Setup the signals
 289         connect(&d->cursor_timeout_, SIGNAL(timeout()),
 290                 this, SLOT(toggleCursor()));
 291
 292         int const time = QApplication::cursorFlashTime() / 2;
 293         if (time > 0) {
 294                 d->cursor_timeout_.setInterval(time);
 295                 d->cursor_timeout_.start();
 296         } else {
 297                 // let's initialize this just to be safe
 298                 d->cursor_timeout_.setInterval(500);
 299         }
 300
 301         d->resetScreen();
 302         // With Qt4.5 a mouse event will happen before the first paint event
 303         // so make sure that the buffer view has an up to date metrics.
 304         d->buffer_view_->resize(viewport()->width(), viewport()->height());
 305         d->cursor_ = new frontend::CursorWidget();
 306         d->cursor_->hide();
 307
 308         setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 309         setAcceptDrops(true);
 310         setMouseTracking(true);
 311         setMinimumSize(100, 70);
 312         setFrameStyle(QFrame::NoFrame);
 313         updateWindowTitle();
 314
 315         viewport()->setAutoFillBackground(false);
 316         // We don't need double-buffering nor SystemBackground on
 317         // the viewport because we have our own backing pixmap.
 318         viewport()->setAttribute(Qt::WA_NoSystemBackground);
 319
 320         setFocusPolicy(Qt::StrongFocus);
 321
 322         d->setCursorShape(Qt::IBeamCursor);
 323
 324         // This connection is closed at the same time as this is destroyed.
 325         d->synthetic_mouse_event_.timeout.timeout.connect([this](){
 326                         generateSyntheticMouseEvent();
 327                 });
 328
 329         LYXERR(Debug::GUI, "viewport width: " << viewport()->width()
 330                 << "  viewport height: " << viewport()->height());
 331
 332         // Enables input methods for asian languages.
 333         // Must be set when creating custom text editing widgets.
 334         setAttribute(Qt::WA_InputMethodEnabled, true);
 335
 336         d->dialog_mode_ = false;
 337 }
 338
 339
 340 GuiWorkArea::~GuiWorkArea()
 341 {
 342         // If something is wrong with the buffer, we can ignore it safely
 343         try {
 344                 d->buffer_view_->buffer().workAreaManager().remove(this);
 345         } catch(...) {}
 346         delete d->screen_;
 347         delete d->buffer_view_;
 348         delete d->cursor_;
 349         // Completer has a QObject parent and is thus automatically destroyed.
 350         // See #4758.
 351         // delete completer_;
 352         delete d;
 353 }
 354
 355
 356 Qt::CursorShape GuiWorkArea::cursorShape() const
 357 {
 358         return viewport()->cursor().shape();
 359 }
 360
 361
 362 void GuiWorkArea::Private::setCursorShape(Qt::CursorShape shape)
 363 {
 364         p->viewport()->setCursor(shape);
 365 }
 366
 367
 368 void GuiWorkArea::Private::updateCursorShape()
 369 {
 370         setCursorShape(buffer_view_->clickableInset()
 371                 ? Qt::PointingHandCursor : Qt::IBeamCursor);
 372 }
 373
 374
 375 void GuiWorkArea::setGuiView(GuiView & gv)
 376 {
 377         d->lyx_view_ = &gv;
 378 }
 379
 380
 381 void GuiWorkArea::setBuffer(Buffer & buffer)
 382 {
 383         delete d->buffer_view_;
 384         d->buffer_view_ = new BufferView(buffer);
 385         buffer.workAreaManager().add(this);
 386
 387         // HACK: Prevents an additional redraw when the scrollbar pops up
 388         // which regularily happens on documents with more than one page.
 389         // The policy  should be set to "Qt::ScrollBarAsNeeded" soon.
 390         // Since we have no geometry information yet, we assume that
 391         // a document needs a scrollbar if there is more then four
 392         // paragraph in the outermost text.
 393         if (buffer.text().paragraphs().size() > 4)
 394                 setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
 395         QTimer::singleShot(50, this, SLOT(fixVerticalScrollBar()));
 396         Q_EMIT bufferViewChanged();
 397 }
 398
 399
 400 void GuiWorkArea::fixVerticalScrollBar()
 401 {
 402         if (!isFullScreen())
 403                 setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
 404 }
 405
 406
 407 void GuiWorkArea::close()
 408 {
 409         d->lyx_view_->removeWorkArea(this);
 410 }
 411
 412
 413 void GuiWorkArea::setFullScreen(bool full_screen)
 414 {
 415         d->buffer_view_->setFullScreen(full_screen);
 416         setFrameStyle(QFrame::NoFrame);
 417         if (full_screen) {
 418                 setFrameStyle(QFrame::NoFrame);
 419                 if (lyxrc.full_screen_scrollbar)
 420                         setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 421         } else
 422                 setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
 423 }
 424
 425
 426 BufferView & GuiWorkArea::bufferView()
 427 {
 428         return *d->buffer_view_;
 429 }
 430
 431
 432 BufferView const & GuiWorkArea::bufferView() const
 433 {
 434         return *d->buffer_view_;
 435 }
 436
 437
 438 void GuiWorkArea::stopBlinkingCursor()
 439 {
 440         d->cursor_timeout_.stop();
 441         d->hideCursor();
 442 }
 443
 444
 445 void GuiWorkArea::startBlinkingCursor()
 446 {
 447         // do not show the cursor if the view is busy
 448         if (view().busy())
 449                 return;
 450
 451         Point p;
 452         int h = 0;
 453         d->buffer_view_->cursorPosAndHeight(p, h);
 454         // Don't start blinking if the cursor isn't on screen.
 455         if (!d->buffer_view_->cursorInView(p, h))
 456                 return;
 457
 458         d->showCursor();
 459
 460         //we're not supposed to cache this value.
 461         int const time = QApplication::cursorFlashTime() / 2;
 462         if (time <= 0)
 463                 return;
 464         d->cursor_timeout_.setInterval(time);
 465         d->cursor_timeout_.start();
 466 }
 467
 468
 469 void GuiWorkArea::redraw(bool update_metrics)
 470 {
 471         if (!isVisible())
 472                 // No need to redraw in this case.
 473                 return;
 474
 475         // No need to do anything if this is the current view. The BufferView
 476         // metrics are already up to date.
 477         if (update_metrics || d->lyx_view_ != guiApp->currentView()
 478                 || d->lyx_view_->currentWorkArea() != this) {
 479                 // FIXME: it would be nice to optimize for the off-screen case.
 480                 d->buffer_view_->cursor().fixIfBroken();
 481                 d->buffer_view_->updateMetrics();
 482                 d->buffer_view_->cursor().fixIfBroken();
 483         }
 484
 485         // update cursor position, because otherwise it has to wait until
 486         // the blinking interval is over
 487         if (d->cursor_visible_) {
 488                 d->hideCursor();
 489                 d->showCursor();
 490         }
 491
 492         LYXERR(Debug::WORKAREA, "WorkArea::redraw screen");
 493         d->updateScreen();
 494         update(0, 0, viewport()->width(), viewport()->height());
 495
 496         /// \warning: scrollbar updating *must* be done after the BufferView is drawn
 497         /// because \c BufferView::updateScrollbar() is called in \c BufferView::draw().
 498         d->updateScrollbar();
 499         d->lyx_view_->updateStatusBar();
 500
 501         if (lyxerr.debugging(Debug::WORKAREA))
 502                 d->buffer_view_->coordCache().dump();
 503
 504         updateWindowTitle();
 505
 506         d->updateCursorShape();
 507 }
 508
 509
 510 // Keep in sync with GuiWorkArea::processKeySym below
 511 bool GuiWorkArea::queryKeySym(KeySymbol const & key, KeyModifier mod) const
 512 {
 513         return guiApp->queryKeySym(key, mod);
 514 }
 515
 516
 517 // Keep in sync with GuiWorkArea::queryKeySym above
 518 void GuiWorkArea::processKeySym(KeySymbol const & key, KeyModifier mod)
 519 {
 520         if (d->lyx_view_->isFullScreen() && d->lyx_view_->menuBar()->isVisible()
 521                 && lyxrc.full_screen_menubar) {
 522                 // FIXME HACK: we should not have to do this here. See related comment
 523                 // in GuiView::event() (QEvent::ShortcutOverride)
 524                 d->lyx_view_->menuBar()->hide();
 525         }
 526
 527         // In order to avoid bad surprise in the middle of an operation,
 528         // we better stop the blinking cursor...
 529         // the cursor gets restarted in GuiView::restartCursor()
 530         stopBlinkingCursor();
 531         guiApp->processKeySym(key, mod);
 532 }
 533
 534
 535 void GuiWorkArea::Private::dispatch(FuncRequest const & cmd)
 536 {
 537         // Handle drag&drop
 538         if (cmd.action() == LFUN_FILE_OPEN) {
 539                 DispatchResult dr;
 540                 lyx_view_->dispatch(cmd, dr);
 541                 return;
 542         }
 543
 544         bool const notJustMovingTheMouse =
 545                 cmd.action() != LFUN_MOUSE_MOTION || cmd.button() != mouse_button::none;
 546
 547         // In order to avoid bad surprise in the middle of an operation, we better stop
 548         // the blinking cursor.
 549         if (notJustMovingTheMouse)
 550                 p->stopBlinkingCursor();
 551
 552         buffer_view_->mouseEventDispatch(cmd);
 553
 554         // Skip these when selecting
 555         // FIXME: let GuiView take care of those.
 556         if (cmd.action() != LFUN_MOUSE_MOTION) {
 557                 completer_->updateVisibility(false, false);
 558                 lyx_view_->updateDialogs();
 559                 lyx_view_->updateStatusBar();
 560         }
 561
 562         // GUI tweaks except with mouse motion with no button pressed.
 563         if (notJustMovingTheMouse) {
 564                 // Slight hack: this is only called currently when we
 565                 // clicked somewhere, so we force through the display
 566                 // of the new status here.
 567                 // FIXME: let GuiView take care of those.
 568                 lyx_view_->clearMessage();
 569
 570                 // Show the cursor immediately after any operation
 571                 p->startBlinkingCursor();
 572         }
 573
 574         updateCursorShape();
 575 }
 576
 577
 578 void GuiWorkArea::Private::resizeBufferView()
 579 {
 580         // WARNING: Please don't put any code that will trigger a repaint here!
 581         // We are already inside a paint event.
 582         p->stopBlinkingCursor();
 583         // Warn our container (GuiView).
 584         p->busy(true);
 585
 586         Point point;
 587         int h = 0;
 588         buffer_view_->cursorPosAndHeight(point, h);
 589         bool const cursor_in_view = buffer_view_->cursorInView(point, h);
 590         buffer_view_->resize(p->viewport()->width(), p->viewport()->height());
 591         if (cursor_in_view)
 592                 buffer_view_->scrollToCursor();
 593         updateScreen();
 594
 595         // Update scrollbars which might have changed due different
 596         // BufferView dimension. This is especially important when the
 597         // BufferView goes from zero-size to the real-size for the first time,
 598         // as the scrollbar paramters are then set for the first time.
 599         updateScrollbar();
 600
 601         need_resize_ = false;
 602         p->busy(false);
 603         // Eventually, restart the cursor after the resize event.
 604         // We might be resizing even if the focus is on another widget so we only
 605         // restart the cursor if we have the focus.
 606         if (p->hasFocus())
 607                 QTimer::singleShot(50, p, SLOT(startBlinkingCursor()));
 608 }
 609
 610
 611 void GuiWorkArea::Private::showCursor()
 612 {
 613         if (cursor_visible_)
 614                 return;
 615
 616         Point p;
 617         int h = 0;
 618         buffer_view_->cursorPosAndHeight(p, h);
 619         if (!buffer_view_->cursorInView(p, h))
 620                 return;
 621
 622         // RTL or not RTL
 623         bool l_shape = false;
 624         Font const & realfont = buffer_view_->cursor().real_current_font;
 625         BufferParams const & bp = buffer_view_->buffer().params();
 626         bool const samelang = realfont.language() == bp.language;
 627         bool const isrtl = realfont.isVisibleRightToLeft();
 628
 629         if (!samelang || isrtl != bp.language->rightToLeft())
 630                 l_shape = true;
 631
 632         // The ERT language hack needs fixing up
 633         if (realfont.language() == latex_language)
 634                 l_shape = false;
 635
 636         // show cursor on screen
 637         Cursor & cur = buffer_view_->cursor();
 638         bool completable = cur.inset().showCompletionCursor()
 639                 && completer_->completionAvailable()
 640                 && !completer_->popupVisible()
 641                 && !completer_->inlineVisible();
 642         cursor_visible_ = true;
 643         cursor_->recomputeWidth();
 644
 645         //int cur_x = buffer_view_->getPos(cur).x_;
 646         // We may have decided to slide the cursor row so that cursor
 647         // is visible.
 648         p.x_ -= buffer_view_->horizScrollOffset();
 649
 650         showCursor(p.x_, p.y_, h, l_shape, isrtl, completable);
 651 }
 652
 653
 654 void GuiWorkArea::Private::hideCursor()
 655 {
 656         if (!cursor_visible_)
 657                 return;
 658
 659         cursor_visible_ = false;
 660         removeCursor();
 661 }
 662
 663
 664 void GuiWorkArea::toggleCursor()
 665 {
 666         if (d->cursor_visible_)
 667                 d->hideCursor();
 668         else
 669                 d->showCursor();
 670 }
 671
 672
 673 void GuiWorkArea::Private::updateScrollbar()
 674 {
 675         // Prevent setRange() and setSliderPosition from causing recursive calls via
 676         // the signal valueChanged. (#10311)
 677         QObject::disconnect(p->verticalScrollBar(), SIGNAL(valueChanged(int)),
 678                             p, SLOT(scrollTo(int)));
 679         ScrollbarParameters const & scroll_ = buffer_view_->scrollbarParameters();
 680         p->verticalScrollBar()->setRange(scroll_.min, scroll_.max);
 681         p->verticalScrollBar()->setPageStep(scroll_.page_step);
 682         p->verticalScrollBar()->setSingleStep(scroll_.single_step);
 683         p->verticalScrollBar()->setSliderPosition(0);
 684         // Connect to the vertical scroll bar
 685         QObject::connect(p->verticalScrollBar(), SIGNAL(valueChanged(int)),
 686                          p, SLOT(scrollTo(int)));
 687 }
 688
 689
 690 void GuiWorkArea::scrollTo(int value)
 691 {
 692         stopBlinkingCursor();
 693         d->buffer_view_->scrollDocView(value, true);
 694
 695         if (lyxrc.cursor_follows_scrollbar) {
 696                 d->buffer_view_->setCursorFromScrollbar();
 697                 // FIXME: let GuiView take care of those.
 698                 d->lyx_view_->updateLayoutList();
 699         }
 700         // Show the cursor immediately after any operation.
 701         startBlinkingCursor();
 702         // FIXME QT5
 703 #ifdef Q_WS_X11
 704         QApplication::syncX();
 705 #endif
 706 }
 707
 708
 709 bool GuiWorkArea::event(QEvent * e)
 710 {
 711         switch (e->type()) {
 712         case QEvent::ToolTip: {
 713                 QHelpEvent * helpEvent = static_cast<QHelpEvent *>(e);
 714                 if (lyxrc.use_tooltip) {
 715                         QPoint pos = helpEvent->pos();
 716                         if (pos.x() < viewport()->width()) {
 717                                 QString s = toqstr(d->buffer_view_->toolTip(pos.x(), pos.y()));
 718                                 QToolTip::showText(helpEvent->globalPos(), formatToolTip(s,35));
 719                         }
 720                         else
 721                                 QToolTip::hideText();
 722                 }
 723                 // Don't forget to accept the event!
 724                 e->accept();
 725                 return true;
 726         }
 727
 728         case QEvent::ShortcutOverride:
 729                 // keyPressEvent is ShortcutOverride-aware and only accepts the event in
 730                 // this case
 731                 keyPressEvent(static_cast<QKeyEvent *>(e));
 732                 return e->isAccepted();
 733
 734         case QEvent::KeyPress: {
 735                 // We catch this event in order to catch the Tab or Shift+Tab key press
 736                 // which are otherwise reserved to focus switching between controls
 737                 // within a dialog.
 738                 QKeyEvent * ke = static_cast<QKeyEvent*>(e);
 739                 if ((ke->key() == Qt::Key_Tab && ke->modifiers() == Qt::NoModifier)
 740                         || (ke->key() == Qt::Key_Backtab && (
 741                                 ke->modifiers() == Qt::ShiftModifier
 742                                 || ke->modifiers() == Qt::NoModifier))) {
 743                         keyPressEvent(ke);
 744                         return true;
 745                 }
 746                 return QAbstractScrollArea::event(e);
 747         }
 748
 749         default:
 750                 return QAbstractScrollArea::event(e);
 751         }
 752         return false;
 753 }
 754
 755
 756 void GuiWorkArea::contextMenuEvent(QContextMenuEvent * e)
 757 {
 758         string name;
 759         if (e->reason() == QContextMenuEvent::Mouse)
 760                 // the menu name is set on mouse press
 761                 name = d->context_menu_name_;
 762         else {
 763                 QPoint pos = e->pos();
 764                 Cursor const & cur = d->buffer_view_->cursor();
 765                 if (e->reason() == QContextMenuEvent::Keyboard && cur.inTexted()) {
 766                         // Do not access the context menu of math right in front of before
 767                         // the cursor. This does not work when the cursor is in text.
 768                         Inset * inset = cur.paragraph().getInset(cur.pos());
 769                         if (inset && inset->asInsetMath())
 770                                 --pos.rx();
 771                         else if (cur.pos() > 0) {
 772                                 Inset * inset = cur.paragraph().getInset(cur.pos() - 1);
 773                                 if (inset)
 774                                         ++pos.rx();
 775                         }
 776                 }
 777                 name = d->buffer_view_->contextMenu(pos.x(), pos.y());
 778         }
 779
 780         if (name.empty()) {
 781                 e->accept();
 782                 return;
 783         }
 784         // always show mnemonics when the keyboard is used to show the context menu
 785         // FIXME: This should be fixed in Qt itself
 786         bool const keyboard = (e->reason() == QContextMenuEvent::Keyboard);
 787         QMenu * menu = guiApp->menus().menu(toqstr(name), *d->lyx_view_, keyboard);
 788         if (!menu) {
 789                 e->accept();
 790                 return;
 791         }
 792         // Position the menu to the right.
 793         // FIXME: menu position should be different for RTL text.
 794         menu->exec(e->globalPos());
 795         e->accept();
 796 }
 797
 798
 799 void GuiWorkArea::focusInEvent(QFocusEvent * e)
 800 {
 801         LYXERR(Debug::DEBUG, "GuiWorkArea::focusInEvent(): " << this << endl);
 802         if (d->lyx_view_->currentWorkArea() != this) {
 803                 d->lyx_view_->setCurrentWorkArea(this);
 804                 d->lyx_view_->currentWorkArea()->bufferView().buffer().updateBuffer();
 805         }
 806
 807         startBlinkingCursor();
 808         QAbstractScrollArea::focusInEvent(e);
 809 }
 810
 811
 812 void GuiWorkArea::focusOutEvent(QFocusEvent * e)
 813 {
 814         LYXERR(Debug::DEBUG, "GuiWorkArea::focusOutEvent(): " << this << endl);
 815         stopBlinkingCursor();
 816         QAbstractScrollArea::focusOutEvent(e);
 817 }
 818
 819
 820 void GuiWorkArea::mousePressEvent(QMouseEvent * e)
 821 {
 822         if (d->dc_event_.active && d->dc_event_ == *e) {
 823                 d->dc_event_.active = false;
 824                 FuncRequest cmd(LFUN_MOUSE_TRIPLE, e->x(), e->y(),
 825                         q_button_state(e->button()), q_key_state(e->modifiers()));
 826                 d->dispatch(cmd);
 827                 e->accept();
 828                 return;
 829         }
 830
 831 #if (QT_VERSION < 0x050000) && !defined(__HAIKU__)
 832         inputContext()->reset();
 833 #endif
 834
 835         FuncRequest const cmd(LFUN_MOUSE_PRESS, e->x(), e->y(),
 836                         q_button_state(e->button()), q_key_state(e->modifiers()));
 837         d->dispatch(cmd);
 838
 839         // Save the context menu on mouse press, because also the mouse
 840         // cursor is set on mouse press. Afterwards, we can either release
 841         // the mousebutton somewhere else, or the cursor might have moved
 842         // due to the DEPM. We need to do this after the mouse has been
 843         // set in dispatch(), because the selection state might change.
 844         if (e->button() == Qt::RightButton)
 845                 d->context_menu_name_ = d->buffer_view_->contextMenu(e->x(), e->y());
 846
 847         e->accept();
 848 }
 849
 850
 851 void GuiWorkArea::mouseReleaseEvent(QMouseEvent * e)
 852 {
 853         if (d->synthetic_mouse_event_.timeout.running())
 854                 d->synthetic_mouse_event_.timeout.stop();
 855
 856         FuncRequest const cmd(LFUN_MOUSE_RELEASE, e->x(), e->y(),
 857                         q_button_state(e->button()), q_key_state(e->modifiers()));
 858         d->dispatch(cmd);
 859         e->accept();
 860 }
 861
 862
 863 void GuiWorkArea::mouseMoveEvent(QMouseEvent * e)
 864 {
 865         // we kill the triple click if we move
 866         doubleClickTimeout();
 867         FuncRequest cmd(LFUN_MOUSE_MOTION, e->x(), e->y(),
 868                         q_motion_state(e->buttons()), q_key_state(e->modifiers()));
 869
 870         e->accept();
 871
 872         // If we're above or below the work area...
 873         if ((e->y() <= 20 || e->y() >= viewport()->height() - 20)
 874                         && e->buttons() == mouse_button::button1) {
 875                 // Make sure only a synthetic event can cause a page scroll,
 876                 // so they come at a steady rate:
 877                 if (e->y() <= 20)
 878                         // _Force_ a scroll up:
 879                         cmd.set_y(e->y() - 21);
 880                 else
 881                         cmd.set_y(e->y() + 21);
 882                 // Store the event, to be handled when the timeout expires.
 883                 d->synthetic_mouse_event_.cmd = cmd;
 884
 885                 if (d->synthetic_mouse_event_.timeout.running()) {
 886                         // Discard the event. Note that it _may_ be handled
 887                         // when the timeout expires if
 888                         // synthetic_mouse_event_.cmd has not been overwritten.
 889                         // Ie, when the timeout expires, we handle the
 890                         // most recent event but discard all others that
 891                         // occurred after the one used to start the timeout
 892                         // in the first place.
 893                         return;
 894                 }
 895
 896                 d->synthetic_mouse_event_.restart_timeout = true;
 897                 d->synthetic_mouse_event_.timeout.start();
 898                 // Fall through to handle this event...
 899
 900         } else if (d->synthetic_mouse_event_.timeout.running()) {
 901                 // Store the event, to be possibly handled when the timeout
 902                 // expires.
 903                 // Once the timeout has expired, normal control is returned
 904                 // to mouseMoveEvent (restart_timeout = false).
 905                 // This results in a much smoother 'feel' when moving the
 906                 // mouse back into the work area.
 907                 d->synthetic_mouse_event_.cmd = cmd;
 908                 d->synthetic_mouse_event_.restart_timeout = false;
 909                 return;
 910         }
 911         d->dispatch(cmd);
 912 }
 913
 914
 915 void GuiWorkArea::wheelEvent(QWheelEvent * ev)
 916 {
 917         // Wheel rotation by one notch results in a delta() of 120 (see
 918         // documentation of QWheelEvent)
 919         double const delta = ev->delta() / 120.0;
 920         bool zoom = false;
 921         switch (lyxrc.scroll_wheel_zoom) {
 922         case LyXRC::SCROLL_WHEEL_ZOOM_CTRL:
 923                 zoom = ev->modifiers() & Qt::ControlModifier;
 924                 zoom &= !(ev->modifiers() & (Qt::ShiftModifier | Qt::AltModifier));
 925                 break;
 926         case LyXRC::SCROLL_WHEEL_ZOOM_SHIFT:
 927                 zoom = ev->modifiers() & Qt::ShiftModifier;
 928                 zoom &= !(ev->modifiers() & (Qt::ControlModifier | Qt::AltModifier));
 929                 break;
 930         case LyXRC::SCROLL_WHEEL_ZOOM_ALT:
 931                 zoom = ev->modifiers() & Qt::AltModifier;
 932                 zoom &= !(ev->modifiers() & (Qt::ShiftModifier | Qt::ControlModifier));
 933                 break;
 934         case LyXRC::SCROLL_WHEEL_ZOOM_OFF:
 935                 break;
 936         }
 937         if (zoom) {
 938                 docstring arg = convert<docstring>(int(5 * delta));
 939                 lyx::dispatch(FuncRequest(LFUN_BUFFER_ZOOM_IN, arg));
 940                 return;
 941         }
 942
 943         // Take into account the desktop wide settings.
 944         int const lines = qApp->wheelScrollLines();
 945         int const page_step = verticalScrollBar()->pageStep();
 946         // Test if the wheel mouse is set to one screen at a time.
 947         // This is according to
 948         // https://doc.qt.io/qt-5/qapplication.html#wheelScrollLines-prop
 949         int scroll_value =
 950                 min(lines * verticalScrollBar()->singleStep(), page_step);
 951
 952         // Take into account the rotation and the user preferences.
 953         scroll_value = int(scroll_value * delta * lyxrc.mouse_wheel_speed);
 954         LYXERR(Debug::SCROLLING, "wheelScrollLines = " << lines
 955                         << " delta = " << delta << " scroll_value = " << scroll_value
 956                         << " page_step = " << page_step);
 957         // Now scroll.
 958         verticalScrollBar()->setValue(verticalScrollBar()->value() - scroll_value);
 959
 960         ev->accept();
 961 }
 962
 963
 964 void GuiWorkArea::generateSyntheticMouseEvent()
 965 {
 966         int const e_y = d->synthetic_mouse_event_.cmd.y();
 967         int const wh = d->buffer_view_->workHeight();
 968         bool const up = e_y < 0;
 969         bool const down = e_y > wh;
 970
 971         // Set things off to generate the _next_ 'pseudo' event.
 972         int step = 50;
 973         if (d->synthetic_mouse_event_.restart_timeout) {
 974                 // This is some magic formulae to determine the speed
 975                 // of scrolling related to the position of the mouse.
 976                 int time = 200;
 977                 if (up || down) {
 978                         int dist = up ? -e_y : e_y - wh;
 979                         time = max(min(200, 250000 / (dist * dist)), 1) ;
 980
 981                         if (time < 40) {
 982                                 step = 80000 / (time * time);
 983                                 time = 40;
 984                         }
 985                 }
 986                 d->synthetic_mouse_event_.timeout.setTimeout(time);
 987                 d->synthetic_mouse_event_.timeout.start();
 988         }
 989
 990         // Can we scroll further ?
 991         int const value = verticalScrollBar()->value();
 992         if (value == verticalScrollBar()->maximum()
 993                   || value == verticalScrollBar()->minimum()) {
 994                 d->synthetic_mouse_event_.timeout.stop();
 995                 return;
 996         }
 997
 998         // Scroll
 999         if (step <= 2 * wh) {
1000                 d->buffer_view_->scroll(up ? -step : step);
1001                 d->buffer_view_->updateMetrics();
1002         } else {
1003                 d->buffer_view_->scrollDocView(value + (up ? -step : step), false);
1004         }
1005
1006         // In which paragraph do we have to set the cursor ?
1007         Cursor & cur = d->buffer_view_->cursor();
1008         // FIXME: we don't know how to handle math.
1009         Text * text = cur.text();
1010         if (!text)
1011                 return;
1012         TextMetrics const & tm = d->buffer_view_->textMetrics(text);
1013
1014         // Quit gracefully if there are no metrics, since otherwise next
1015         // line would crash (bug #10324).
1016         // This situation seems related to a (not yet understood) timing problem.
1017         if (tm.empty())
1018                 return;
1019
1020         pair<pit_type, const ParagraphMetrics *> pp = up ? tm.first() : tm.last();
1021         ParagraphMetrics const & pm = *pp.second;
1022         pit_type const pit = pp.first;
1023
1024         if (pm.rows().empty())
1025                 return;
1026
1027         // Find the row at which we set the cursor.
1028         RowList::const_iterator rit = pm.rows().begin();
1029         RowList::const_iterator rlast = pm.rows().end();
1030         int yy = pm.position() - pm.ascent();
1031         for (--rlast; rit != rlast; ++rit) {
1032                 int h = rit->height();
1033                 if ((up && yy + h > 0)
1034                           || (!up && yy + h > wh - defaultRowHeight()))
1035                         break;
1036                 yy += h;
1037         }
1038
1039         // Find the position of the cursor
1040         bool bound;
1041         int x = d->synthetic_mouse_event_.cmd.x();
1042         pos_type const pos = tm.getPosNearX(*rit, x, bound);
1043
1044         // Set the cursor
1045         cur.pit() = pit;
1046         cur.pos() = pos;
1047         cur.boundary(bound);
1048
1049         d->buffer_view_->buffer().changed(false);
1050         return;
1051 }
1052
1053
1054 // CompressorProxy adapted from Kuba Ober https://stackoverflow.com/a/21006207
1055 CompressorProxy::CompressorProxy(GuiWorkArea * wa) : QObject(wa)
1056 {
1057         qRegisterMetaType<KeySymbol>("KeySymbol");
1058         qRegisterMetaType<KeyModifier>("KeyModifier");
1059         connect(wa, &GuiWorkArea::compressKeySym, this, &CompressorProxy::slot,
1060                 Qt::QueuedConnection);
1061         connect(this, &CompressorProxy::signal, wa, &GuiWorkArea::processKeySym);
1062 }
1063
1064
1065 bool CompressorProxy::emitCheck(bool isAutoRepeat)
1066 {
1067         flag_ = true;
1068         if (isAutoRepeat)
1069                 QCoreApplication::sendPostedEvents(this, QEvent::MetaCall); // recurse
1070         bool result = flag_;
1071         flag_ = false;
1072         return result;
1073 }
1074
1075
1076 void CompressorProxy::slot(KeySymbol sym, KeyModifier mod, bool isAutoRepeat)
1077 {
1078         if (emitCheck(isAutoRepeat))
1079                 Q_EMIT signal(sym, mod);
1080         else
1081                 LYXERR(Debug::KEY, "system is busy: autoRepeat key event ignored");
1082 }
1083
1084
1085 void GuiWorkArea::keyPressEvent(QKeyEvent * ev)
1086 {
1087         // this is also called for ShortcutOverride events. In this case, one must
1088         // not act but simply accept the event explicitly.
1089         bool const act = (ev->type() != QEvent::ShortcutOverride);
1090
1091         // Do not process here some keys if dialog_mode_ is set
1092         bool const for_dialog_mode = d->dialog_mode_
1093                 && (ev->modifiers() == Qt::NoModifier
1094                     || ev->modifiers() == Qt::ShiftModifier)
1095                 && (ev->key() == Qt::Key_Escape
1096                     || ev->key() == Qt::Key_Enter
1097                     || ev->key() == Qt::Key_Return);
1098         // also do not use autoRepeat to input shortcuts
1099         bool const autoRepeat = ev->isAutoRepeat();
1100
1101         if (for_dialog_mode || (!act && autoRepeat)) {
1102                 ev->ignore();
1103                 return;
1104         }
1105
1106         // intercept some keys if completion popup is visible
1107         if (d->completer_->popupVisible()) {
1108                 switch (ev->key()) {
1109                 case Qt::Key_Enter:
1110                 case Qt::Key_Return:
1111                         if (act)
1112                                 d->completer_->activate();
1113                         ev->accept();
1114                         return;
1115                 }
1116         }
1117
1118         KeyModifier const m = q_key_state(ev->modifiers());
1119
1120         if (act && lyxerr.debugging(Debug::KEY)) {
1121                 std::string str;
1122                 if (m & ShiftModifier)
1123                         str += "Shift-";
1124                 if (m & ControlModifier)
1125                         str += "Control-";
1126                 if (m & AltModifier)
1127                         str += "Alt-";
1128                 if (m & MetaModifier)
1129                         str += "Meta-";
1130                 LYXERR(Debug::KEY, " count: " << ev->count() << " text: " << ev->text()
1131                        << " isAutoRepeat: " << ev->isAutoRepeat() << " key: " << ev->key()
1132                        << " keyState: " << str);
1133         }
1134
1135         KeySymbol sym;
1136         setKeySymbol(&sym, ev);
1137         if (sym.isOK()) {
1138                 if (act) {
1139                         Q_EMIT compressKeySym(sym, m, autoRepeat);
1140                         ev->accept();
1141                 } else
1142                         // here, !autoRepeat, as determined at the beginning
1143                         ev->setAccepted(queryKeySym(sym, m));
1144         } else {
1145                 ev->ignore();
1146         }
1147 }
1148
1149
1150 void GuiWorkArea::doubleClickTimeout()
1151 {
1152         d->dc_event_.active = false;
1153 }
1154
1155
1156 void GuiWorkArea::mouseDoubleClickEvent(QMouseEvent * ev)
1157 {
1158         d->dc_event_ = DoubleClick(ev);
1159         QTimer::singleShot(QApplication::doubleClickInterval(), this,
1160                         SLOT(doubleClickTimeout()));
1161         FuncRequest cmd(LFUN_MOUSE_DOUBLE, ev->x(), ev->y(),
1162                         q_button_state(ev->button()), q_key_state(ev->modifiers()));
1163         d->dispatch(cmd);
1164         ev->accept();
1165 }
1166
1167
1168 void GuiWorkArea::resizeEvent(QResizeEvent * ev)
1169 {
1170         QAbstractScrollArea::resizeEvent(ev);
1171         d->need_resize_ = true;
1172         ev->accept();
1173 }
1174
1175
1176 void GuiWorkArea::Private::update(int x, int y, int w, int h)
1177 {
1178         p->viewport()->update(x, y, w, h);
1179 }
1180
1181
1182 void GuiWorkArea::paintEvent(QPaintEvent * ev)
1183 {
1184         QRectF const rc = ev->rect();
1185         // LYXERR(Debug::PAINTING, "paintEvent begin: x: " << rc.x()
1186         //      << " y: " << rc.y() << " w: " << rc.width() << " h: " << rc.height());
1187
1188         if (d->needResize()) {
1189                 d->resetScreen();
1190                 d->resizeBufferView();
1191                 if (d->cursor_visible_) {
1192                         d->hideCursor();
1193                         d->showCursor();
1194                 }
1195         }
1196
1197         QPainter pain(viewport());
1198         double const pr = pixelRatio();
1199         QRectF const rcs = QRectF(rc.x() * pr, rc.y() * pr, rc.width() * pr, rc.height() * pr);
1200
1201         if (lyxrc.use_qimage) {
1202                 QImage const & image = static_cast<QImage const &>(*d->screen_);
1203                 pain.drawImage(rc, image, rcs);
1204         } else {
1205                 QPixmap const & pixmap = static_cast<QPixmap const &>(*d->screen_);
1206                 pain.drawPixmap(rc, pixmap, rcs);
1207         }
1208         d->cursor_->draw(pain);
1209         ev->accept();
1210 }
1211
1212
1213 void GuiWorkArea::Private::updateScreen()
1214 {
1215         GuiPainter pain(screen_, p->pixelRatio());
1216         buffer_view_->draw(pain);
1217 }
1218
1219
1220 void GuiWorkArea::Private::showCursor(int x, int y, int h,
1221         bool l_shape, bool rtl, bool completable)
1222 {
1223         if (schedule_redraw_) {
1224                 // This happens when a graphic conversion is finished. As we don't know
1225                 // the size of the new graphics, it's better the update everything.
1226                 // We can't use redraw() here because this would trigger a infinite
1227                 // recursive loop with showCursor().
1228                 buffer_view_->resize(p->viewport()->width(), p->viewport()->height());
1229                 updateScreen();
1230                 updateScrollbar();
1231                 p->viewport()->update(QRect(0, 0, p->viewport()->width(), p->viewport()->height()));
1232                 schedule_redraw_ = false;
1233                 // Show the cursor immediately after the update.
1234                 hideCursor();
1235                 p->toggleCursor();
1236                 return;
1237         }
1238
1239         cursor_->update(x, y, h, l_shape, rtl, completable);
1240         cursor_->show();
1241         p->viewport()->update(cursor_->rect());
1242 }
1243
1244
1245 void GuiWorkArea::Private::removeCursor()
1246 {
1247         cursor_->hide();
1248         //if (!qApp->focusWidget())
1249                 p->viewport()->update(cursor_->rect());
1250 }
1251
1252
1253 void GuiWorkArea::inputMethodEvent(QInputMethodEvent * e)
1254 {
1255         QString const & commit_string = e->commitString();
1256         docstring const & preedit_string
1257                 = qstring_to_ucs4(e->preeditString());
1258
1259         if (!commit_string.isEmpty()) {
1260
1261                 LYXERR(Debug::KEY, "preeditString: " << e->preeditString()
1262                         << " commitString: " << e->commitString());
1263
1264                 int key = 0;
1265
1266                 // FIXME Iwami 04/01/07: we should take care also of UTF16 surrogates here.
1267                 for (int i = 0; i != commit_string.size(); ++i) {
1268                         QKeyEvent ev(QEvent::KeyPress, key, Qt::NoModifier, commit_string[i]);
1269                         keyPressEvent(&ev);
1270                 }
1271         }
1272
1273         // Hide the cursor during the kana-kanji transformation.
1274         if (preedit_string.empty())
1275                 startBlinkingCursor();
1276         else
1277                 stopBlinkingCursor();
1278
1279         // last_width : for checking if last preedit string was/wasn't empty.
1280         // FIXME THREAD && FIXME
1281         // We could have more than one work area, right?
1282         static bool last_width = false;
1283         if (!last_width && preedit_string.empty()) {
1284                 // if last_width is last length of preedit string.
1285                 e->accept();
1286                 return;
1287         }
1288
1289         GuiPainter pain(d->screen_, pixelRatio());
1290         d->buffer_view_->updateMetrics();
1291         d->buffer_view_->draw(pain);
1292         // FIXME: shall we use real_current_font here? (see #10478)
1293         FontInfo font = d->buffer_view_->cursor().getFont().fontInfo();
1294         FontMetrics const & fm = theFontMetrics(font);
1295         int height = fm.maxHeight();
1296         int cur_x = d->cursor_->rect().left();
1297         int cur_y = d->cursor_->rect().bottom();
1298
1299         // redraw area of preedit string.
1300         update(0, cur_y - height, viewport()->width(),
1301                 (height + 1) * d->preedit_lines_);
1302
1303         if (preedit_string.empty()) {
1304                 last_width = false;
1305                 d->preedit_lines_ = 1;
1306                 e->accept();
1307                 return;
1308         }
1309         last_width = true;
1310
1311         // att : stores an IM attribute.
1312         QList<QInputMethodEvent::Attribute> const & att = e->attributes();
1313
1314         // get attributes of input method cursor.
1315         // cursor_pos : cursor position in preedit string.
1316         size_t cursor_pos = 0;
1317         bool cursor_is_visible = false;
1318         for (int i = 0; i != att.size(); ++i) {
1319                 if (att.at(i).type == QInputMethodEvent::Cursor) {
1320                         cursor_pos = att.at(i).start;
1321                         cursor_is_visible = att.at(i).length != 0;
1322                         break;
1323                 }
1324         }
1325
1326         size_t preedit_length = preedit_string.length();
1327
1328         // get position of selection in input method.
1329         // FIXME: isn't there a way to do this simplier?
1330         // rStart : cursor position in selected string in IM.
1331         size_t rStart = 0;
1332         // rLength : selected string length in IM.
1333         size_t rLength = 0;
1334         if (cursor_pos < preedit_length) {
1335                 for (int i = 0; i != att.size(); ++i) {
1336                         if (att.at(i).type == QInputMethodEvent::TextFormat) {
1337                                 if (att.at(i).start <= int(cursor_pos)
1338                                         && int(cursor_pos) < att.at(i).start + att.at(i).length) {
1339                                                 rStart = att.at(i).start;
1340                                                 rLength = att.at(i).length;
1341                                                 if (!cursor_is_visible)
1342                                                         cursor_pos += rLength;
1343                                                 break;
1344                                 }
1345                         }
1346                 }
1347         }
1348         else {
1349                 rStart = cursor_pos;
1350                 rLength = 0;
1351         }
1352
1353         int const right_margin = d->buffer_view_->rightMargin();
1354         Painter::preedit_style ps;
1355         // Most often there would be only one line:
1356         d->preedit_lines_ = 1;
1357         for (size_t pos = 0; pos != preedit_length; ++pos) {
1358                 char_type const typed_char = preedit_string[pos];
1359                 // reset preedit string style
1360                 ps = Painter::preedit_default;
1361
1362                 // if we reached the right extremity of the screen, go to next line.
1363                 if (cur_x + fm.width(typed_char) > viewport()->width() - right_margin) {
1364                         cur_x = right_margin;
1365                         cur_y += height + 1;
1366                         ++d->preedit_lines_;
1367                 }
1368                 // preedit strings are displayed with dashed underline
1369                 // and partial strings are displayed white on black indicating
1370                 // that we are in selecting mode in the input method.
1371                 // FIXME: rLength == preedit_length is not a changing condition
1372                 // FIXME: should be put out of the loop.
1373                 if (pos >= rStart
1374                         && pos < rStart + rLength
1375                         && !(cursor_pos < rLength && rLength == preedit_length))
1376                         ps = Painter::preedit_selecting;
1377
1378                 if (pos == cursor_pos
1379                         && (cursor_pos < rLength && rLength == preedit_length))
1380                         ps = Painter::preedit_cursor;
1381
1382                 // draw one character and update cur_x.
1383                 cur_x += pain.preeditText(cur_x, cur_y, typed_char, font, ps);
1384         }
1385
1386         // update the preedit string screen area.
1387         update(0, cur_y - d->preedit_lines_*height, viewport()->width(),
1388                 (height + 1) * d->preedit_lines_);
1389
1390         // Don't forget to accept the event!
1391         e->accept();
1392 }
1393
1394
1395 QVariant GuiWorkArea::inputMethodQuery(Qt::InputMethodQuery query) const
1396 {
1397         QRect cur_r(0, 0, 0, 0);
1398         switch (query) {
1399                 // this is the CJK-specific composition window position and
1400                 // the context menu position when the menu key is pressed.
1401                 case Qt::ImMicroFocus:
1402                         cur_r = d->cursor_->rect();
1403                         if (d->preedit_lines_ != 1)
1404                                 cur_r.moveLeft(10);
1405                         cur_r.moveBottom(cur_r.bottom()
1406                                 + cur_r.height() * (d->preedit_lines_ - 1));
1407                         // return lower right of cursor in LyX.
1408                         return cur_r;
1409                 default:
1410                         return QWidget::inputMethodQuery(query);
1411         }
1412 }
1413
1414
1415 void GuiWorkArea::updateWindowTitle()
1416 {
1417         Buffer const & buf = bufferView().buffer();
1418         if (buf.fileName() != d->file_name_
1419             || buf.params().shell_escape != d->shell_escape_
1420             || buf.hasReadonlyFlag() != d->read_only_
1421             || buf.lyxvc().vcstatus() != d->vc_status_
1422             || buf.isClean() != d->clean_
1423             || buf.notifiesExternalModification() != d->externally_modified_) {
1424                 d->file_name_ = buf.fileName();
1425                 d->shell_escape_ = buf.params().shell_escape;
1426                 d->read_only_ = buf.hasReadonlyFlag();
1427                 d->vc_status_ = buf.lyxvc().vcstatus();
1428                 d->clean_ = buf.isClean();
1429                 d->externally_modified_ = buf.notifiesExternalModification();
1430                 Q_EMIT titleChanged(this);
1431         }
1432 }
1433
1434
1435 bool GuiWorkArea::isFullScreen() const
1436 {
1437         return d->lyx_view_ && d->lyx_view_->isFullScreen();
1438 }
1439
1440
1441 void GuiWorkArea::scheduleRedraw()
1442 {
1443         d->schedule_redraw_ = true;
1444 }
1445
1446
1447 bool GuiWorkArea::inDialogMode() const
1448 {
1449         return d->dialog_mode_;
1450 }
1451
1452
1453 void GuiWorkArea::setDialogMode(bool mode)
1454 {
1455         d->dialog_mode_ = mode;
1456 }
1457
1458
1459 GuiCompleter & GuiWorkArea::completer()
1460 {
1461         return *d->completer_;
1462 }
1463
1464 GuiView const & GuiWorkArea::view() const
1465 {
1466         return *d->lyx_view_;
1467 }
1468
1469
1470 GuiView & GuiWorkArea::view()
1471 {
1472         return *d->lyx_view_;
1473 }
1474
1475 ////////////////////////////////////////////////////////////////////
1476 //
1477 // EmbeddedWorkArea
1478 //
1479 ////////////////////////////////////////////////////////////////////
1480
1481
1482 EmbeddedWorkArea::EmbeddedWorkArea(QWidget * w): GuiWorkArea(w)
1483 {
1484         support::TempFile tempfile("embedded.internal");
1485         tempfile.setAutoRemove(false);
1486         buffer_ = theBufferList().newInternalBuffer(tempfile.name().absFileName());
1487         buffer_->setUnnamed(true);
1488         buffer_->setFullyLoaded(true);
1489         setBuffer(*buffer_);
1490         setDialogMode(true);
1491 }
1492
1493
1494 EmbeddedWorkArea::~EmbeddedWorkArea()
1495 {
1496         // No need to destroy buffer and bufferview here, because it is done
1497         // in theBufferList() destruction loop at application exit
1498 }
1499
1500
1501 void EmbeddedWorkArea::closeEvent(QCloseEvent * ev)
1502 {
1503         disable();
1504         GuiWorkArea::closeEvent(ev);
1505 }
1506
1507
1508 void EmbeddedWorkArea::hideEvent(QHideEvent * ev)
1509 {
1510         disable();
1511         GuiWorkArea::hideEvent(ev);
1512 }
1513
1514
1515 QSize EmbeddedWorkArea::sizeHint () const
1516 {
1517         // FIXME(?):
1518         // GuiWorkArea sets the size to the screen's viewport
1519         // by returning a value this gets overridden
1520         // EmbeddedWorkArea is now sized to fit in the layout
1521         // of the parent, and has a minimum size set in GuiWorkArea
1522         // which is what we return here
1523         return QSize(100, 70);
1524 }
1525
1526
1527 void EmbeddedWorkArea::disable()
1528 {
1529         stopBlinkingCursor();
1530         if (view().currentWorkArea() != this)
1531                 return;
1532         // No problem if currentMainWorkArea() is 0 (setCurrentWorkArea()
1533         // tolerates it and shows the background logo), what happens if
1534         // an EmbeddedWorkArea is closed after closing all document WAs
1535         view().setCurrentWorkArea(view().currentMainWorkArea());
1536 }
1537
1538 ////////////////////////////////////////////////////////////////////
1539 //
1540 // TabWorkArea
1541 //
1542 ////////////////////////////////////////////////////////////////////
1543
1544 #ifdef Q_OS_MAC
1545 class NoTabFrameMacStyle : public QProxyStyle {
1546 public:
1547         ///
1548         QRect subElementRect(SubElement element, const QStyleOption * option,
1549                              const QWidget * widget = 0) const
1550         {
1551                 QRect rect = QProxyStyle::subElementRect(element, option, widget);
1552                 bool noBar = static_cast<QTabWidget const *>(widget)->count() <= 1;
1553
1554                 // The Qt Mac style puts the contents into a 3 pixel wide box
1555                 // which looks very ugly and not like other Mac applications.
1556                 // Hence we remove this here, and moreover the 16 pixel round
1557                 // frame above if the tab bar is hidden.
1558                 if (element == QStyle::SE_TabWidgetTabContents) {
1559                         rect.adjust(- rect.left(), 0, rect.left(), 0);
1560                         if (noBar)
1561                                 rect.setTop(0);
1562                 }
1563
1564                 return rect;
1565         }
1566 };
1567
1568 NoTabFrameMacStyle noTabFrameMacStyle;
1569 #endif
1570
1571
1572 TabWorkArea::TabWorkArea(QWidget * parent)
1573         : QTabWidget(parent), clicked_tab_(-1), midpressed_tab_(-1)
1574 {
1575 #ifdef Q_OS_MAC
1576         setStyle(&noTabFrameMacStyle);
1577 #endif
1578
1579         QPalette pal = palette();
1580         pal.setColor(QPalette::Active, QPalette::Button,
1581                 pal.color(QPalette::Active, QPalette::Window));
1582         pal.setColor(QPalette::Disabled, QPalette::Button,
1583                 pal.color(QPalette::Disabled, QPalette::Window));
1584         pal.setColor(QPalette::Inactive, QPalette::Button,
1585                 pal.color(QPalette::Inactive, QPalette::Window));
1586
1587         QObject::connect(this, SIGNAL(currentChanged(int)),
1588                 this, SLOT(on_currentTabChanged(int)));
1589
1590         closeBufferButton = new QToolButton(this);
1591         closeBufferButton->setPalette(pal);
1592         // FIXME: rename the icon to closebuffer.png
1593         closeBufferButton->setIcon(QIcon(getPixmap("images/", "closetab", "svgz,png")));
1594         closeBufferButton->setText("Close File");
1595         closeBufferButton->setAutoRaise(true);
1596         closeBufferButton->setCursor(Qt::ArrowCursor);
1597         closeBufferButton->setToolTip(qt_("Close File"));
1598         closeBufferButton->setEnabled(true);
1599         QObject::connect(closeBufferButton, SIGNAL(clicked()),
1600                 this, SLOT(closeCurrentBuffer()));
1601         setCornerWidget(closeBufferButton, Qt::TopRightCorner);
1602
1603         // setup drag'n'drop
1604         QTabBar* tb = new DragTabBar;
1605         connect(tb, SIGNAL(tabMoveRequested(int, int)),
1606                 this, SLOT(moveTab(int, int)));
1607         tb->setElideMode(Qt::ElideNone);
1608         setTabBar(tb);
1609
1610         // make us responsible for the context menu of the tabbar
1611         tb->setContextMenuPolicy(Qt::CustomContextMenu);
1612         connect(tb, SIGNAL(customContextMenuRequested(const QPoint &)),
1613                 this, SLOT(showContextMenu(const QPoint &)));
1614         connect(tb, SIGNAL(tabCloseRequested(int)),
1615                 this, SLOT(closeTab(int)));
1616
1617         setUsesScrollButtons(true);
1618 }
1619
1620
1621 void TabWorkArea::mousePressEvent(QMouseEvent *me)
1622 {
1623         if (me->button() == Qt::MidButton)
1624                 midpressed_tab_ = tabBar()->tabAt(me->pos());
1625         else
1626                 QTabWidget::mousePressEvent(me);
1627 }
1628
1629
1630 void TabWorkArea::mouseReleaseEvent(QMouseEvent *me)
1631 {
1632         if (me->button() == Qt::MidButton) {
1633                 int const midreleased_tab = tabBar()->tabAt(me->pos());
1634                 if (midpressed_tab_ == midreleased_tab && posIsTab(me->pos()))
1635                         closeTab(midreleased_tab);
1636         } else
1637                 QTabWidget::mouseReleaseEvent(me);
1638 }
1639
1640
1641 void TabWorkArea::paintEvent(QPaintEvent * event)
1642 {
1643         if (tabBar()->isVisible()) {
1644                 QTabWidget::paintEvent(event);
1645         } else {
1646                 // Prevent the selected tab to influence the
1647                 // painting of the frame of the tab widget.
1648                 // This is needed for gtk style in Qt.
1649                 QStylePainter p(this);
1650 #if QT_VERSION < 0x050000
1651                 QStyleOptionTabWidgetFrameV2 opt;
1652 #else
1653                 QStyleOptionTabWidgetFrame opt;
1654 #endif
1655                 initStyleOption(&opt);
1656                 opt.rect = style()->subElementRect(QStyle::SE_TabWidgetTabPane,
1657                         &opt, this);
1658                 opt.selectedTabRect = QRect();
1659                 p.drawPrimitive(QStyle::PE_FrameTabWidget, opt);
1660         }
1661 }
1662
1663
1664 bool TabWorkArea::posIsTab(QPoint position)
1665 {
1666         // tabAt returns -1 if tab does not covers position
1667         return tabBar()->tabAt(position) > -1;
1668 }
1669
1670
1671 void TabWorkArea::mouseDoubleClickEvent(QMouseEvent * event)
1672 {
1673         if (event->button() != Qt::LeftButton)
1674                 return;
1675
1676         // this code chunk is unnecessary because it seems the event only makes
1677         // it this far if it is not on a tab. I'm not sure why this is (maybe
1678         // it is handled and ended in DragTabBar?), and thus I'm not sure if
1679         // this is true in all cases and if it will be true in the future so I
1680         // leave this code for now. (skostysh, 2016-07-21)
1681         //
1682         // return early if double click on existing tabs
1683         if (posIsTab(event->pos()))
1684                 return;
1685
1686         dispatch(FuncRequest(LFUN_BUFFER_NEW));
1687 }
1688
1689
1690 void TabWorkArea::setFullScreen(bool full_screen)
1691 {
1692         for (int i = 0; i != count(); ++i) {
1693                 if (GuiWorkArea * wa = workArea(i))
1694                         wa->setFullScreen(full_screen);
1695         }
1696
1697         if (lyxrc.full_screen_tabbar)
1698                 showBar(!full_screen && count() > 1);
1699         else
1700                 showBar(count() > 1);
1701 }
1702
1703
1704 void TabWorkArea::showBar(bool show)
1705 {
1706         tabBar()->setEnabled(show);
1707         tabBar()->setVisible(show);
1708         closeBufferButton->setVisible(show && lyxrc.single_close_tab_button);
1709         setTabsClosable(!lyxrc.single_close_tab_button);
1710 }
1711
1712
1713 GuiWorkAreaContainer * TabWorkArea::widget(int index) const
1714 {
1715         QWidget * w = QTabWidget::widget(index);
1716         if (!w)
1717                 return nullptr;
1718         GuiWorkAreaContainer * wac = dynamic_cast<GuiWorkAreaContainer *>(w);
1719         LATTEST(wac);
1720         return wac;
1721 }
1722
1723
1724 GuiWorkAreaContainer * TabWorkArea::currentWidget() const
1725 {
1726         return widget(currentIndex());
1727 }
1728
1729
1730 GuiWorkArea * TabWorkArea::workArea(int index) const
1731 {
1732         GuiWorkAreaContainer * w = widget(index);
1733         if (!w)
1734                 return nullptr;
1735         return w->workArea();
1736 }
1737
1738
1739 GuiWorkArea * TabWorkArea::currentWorkArea() const
1740 {
1741         return workArea(currentIndex());
1742 }
1743
1744
1745 GuiWorkArea * TabWorkArea::workArea(Buffer & buffer) const
1746 {
1747         // FIXME: this method doesn't work if we have more than one work area
1748         // showing the same buffer.
1749         for (int i = 0; i != count(); ++i) {
1750                 GuiWorkArea * wa = workArea(i);
1751                 LASSERT(wa, return 0);
1752                 if (&wa->bufferView().buffer() == &buffer)
1753                         return wa;
1754         }
1755         return 0;
1756 }
1757
1758
1759 void TabWorkArea::closeAll()
1760 {
1761         while (count()) {
1762                 QWidget * wac = widget(0);
1763                 LASSERT(wac, return);
1764                 removeTab(0);
1765                 delete wac;
1766         }
1767 }
1768
1769
1770 int TabWorkArea::indexOfWorkArea(GuiWorkArea * w) const
1771 {
1772         for (int index = 0; index < count(); ++index)
1773                 if (workArea(index) == w)
1774                         return index;
1775         return -1;
1776 }
1777
1778
1779 bool TabWorkArea::setCurrentWorkArea(GuiWorkArea * work_area)
1780 {
1781         LASSERT(work_area, return false);
1782         int index = indexOfWorkArea(work_area);
1783         if (index == -1)
1784                 return false;
1785
1786         if (index == currentIndex())
1787                 // Make sure the work area is up to date.
1788                 on_currentTabChanged(index);
1789         else
1790                 // Switch to the work area.
1791                 setCurrentIndex(index);
1792         work_area->setFocus();
1793
1794         return true;
1795 }
1796
1797
1798 GuiWorkArea * TabWorkArea::addWorkArea(Buffer & buffer, GuiView & view)
1799 {
1800         GuiWorkArea * wa = new GuiWorkArea(buffer, view);
1801         GuiWorkAreaContainer * wac = new GuiWorkAreaContainer(wa);
1802         wa->setUpdatesEnabled(false);
1803         // Hide tabbar if there's no tab (avoid a resize and a flashing tabbar
1804         // when hiding it again below).
1805         if (!(currentWorkArea() && currentWorkArea()->isFullScreen()))
1806                 showBar(count() > 0);
1807         addTab(wac, wa->windowTitle());
1808         QObject::connect(wa, SIGNAL(titleChanged(GuiWorkArea *)),
1809                 this, SLOT(updateTabTexts()));
1810         if (currentWorkArea() && currentWorkArea()->isFullScreen())
1811                 setFullScreen(true);
1812         else
1813                 // Hide tabbar if there's only one tab.
1814                 showBar(count() > 1);
1815
1816         updateTabTexts();
1817
1818         return wa;
1819 }
1820
1821
1822 bool TabWorkArea::removeWorkArea(GuiWorkArea * work_area)
1823 {
1824         LASSERT(work_area, return false);
1825         int index = indexOfWorkArea(work_area);
1826         if (index == -1)
1827                 return false;
1828
1829         work_area->setUpdatesEnabled(false);
1830         QWidget * wac = widget(index);
1831         removeTab(index);
1832         delete wac;
1833
1834         if (count()) {
1835                 // make sure the next work area is enabled.
1836                 currentWidget()->setUpdatesEnabled(true);
1837                 if (currentWorkArea() && currentWorkArea()->isFullScreen())
1838                         setFullScreen(true);
1839                 else
1840                         // Show tabbar only if there's more than one tab.
1841                         showBar(count() > 1);
1842         } else
1843                 lastWorkAreaRemoved();
1844
1845         updateTabTexts();
1846
1847         return true;
1848 }
1849
1850
1851 void TabWorkArea::on_currentTabChanged(int i)
1852 {
1853         // returns e.g. on application destruction
1854         if (i == -1)
1855                 return;
1856         GuiWorkArea * wa = workArea(i);
1857         LASSERT(wa, return);
1858         wa->setUpdatesEnabled(true);
1859         wa->redraw(true);
1860         wa->setFocus();
1861         ///
1862         currentWorkAreaChanged(wa);
1863
1864         LYXERR(Debug::GUI, "currentTabChanged " << i
1865                 << " File: " << wa->bufferView().buffer().absFileName());
1866 }
1867
1868
1869 void TabWorkArea::closeCurrentBuffer()
1870 {
1871         GuiWorkArea * wa;
1872         if (clicked_tab_ == -1)
1873                 wa = currentWorkArea();
1874         else {
1875                 wa = workArea(clicked_tab_);
1876                 LASSERT(wa, return);
1877         }
1878         wa->view().closeWorkArea(wa);
1879 }
1880
1881
1882 void TabWorkArea::hideCurrentTab()
1883 {
1884         GuiWorkArea * wa;
1885         if (clicked_tab_ == -1)
1886                 wa = currentWorkArea();
1887         else {
1888                 wa = workArea(clicked_tab_);
1889                 LASSERT(wa, return);
1890         }
1891         wa->view().hideWorkArea(wa);
1892 }
1893
1894
1895 void TabWorkArea::closeTab(int index)
1896 {
1897         on_currentTabChanged(index);
1898         GuiWorkArea * wa;
1899         if (index == -1)
1900                 wa = currentWorkArea();
1901         else {
1902                 wa = workArea(index);
1903                 LASSERT(wa, return);
1904         }
1905         wa->view().closeWorkArea(wa);
1906 }
1907
1908
1909 ///
1910 class DisplayPath {
1911 public:
1912         /// make vector happy
1913         DisplayPath() : tab_(-1), dottedPrefix_(false) {}
1914         ///
1915         DisplayPath(int tab, FileName const & filename)
1916                 : tab_(tab)
1917         {
1918                 filename_ = (filename.extension() == "lyx") ?
1919                         toqstr(filename.onlyFileNameWithoutExt())
1920                         : toqstr(filename.onlyFileName());
1921                 postfix_ = toqstr(filename.absoluteFilePath()).
1922                         split("/", QString::SkipEmptyParts);
1923                 postfix_.pop_back();
1924                 abs_ = toqstr(filename.absoluteFilePath());
1925                 dottedPrefix_ = false;
1926         }
1927
1928         /// Absolute path for debugging.
1929         QString abs() const
1930         {
1931                 return abs_;
1932         }
1933         /// Add the first segment from the postfix or three dots to the prefix.
1934         /// Merge multiple dot tripples. In fact dots are added lazily, i.e. only
1935         /// when really needed.
1936         void shiftPathSegment(bool dotted)
1937         {
1938                 if (postfix_.count() <= 0)
1939                         return;
1940
1941                 if (!dotted) {
1942                         if (dottedPrefix_ && !prefix_.isEmpty())
1943                                 prefix_ += ellipsisSlash_;
1944                         prefix_ += postfix_.front() + "/";
1945                 }
1946                 dottedPrefix_ = dotted && !prefix_.isEmpty();
1947                 postfix_.pop_front();
1948         }
1949         ///
1950         QString displayString() const
1951         {
1952                 if (prefix_.isEmpty())
1953                         return filename_;
1954
1955                 bool dots = dottedPrefix_ || !postfix_.isEmpty();
1956                 return prefix_ + (dots ? ellipsisSlash_ : "") + filename_;
1957         }
1958         ///
1959         QString forecastPathString() const
1960         {
1961                 if (postfix_.count() == 0)
1962                         return displayString();
1963
1964                 return prefix_
1965                         + (dottedPrefix_ ? ellipsisSlash_ : "")
1966                         + postfix_.front() + "/";
1967         }
1968         ///
1969         bool final() const { return postfix_.empty(); }
1970         ///
1971         int tab() const { return tab_; }
1972
1973 private:
1974         /// ".../"
1975         static QString const ellipsisSlash_;
1976         ///
1977         QString prefix_;
1978         ///
1979         QStringList postfix_;
1980         ///
1981         QString filename_;
1982         ///
1983         QString abs_;
1984         ///
1985         int tab_;
1986         ///
1987         bool dottedPrefix_;
1988 };
1989
1990
1991 QString const DisplayPath::ellipsisSlash_ = QString(QChar(0x2026)) + "/";
1992
1993
1994 ///
1995 bool operator<(DisplayPath const & a, DisplayPath const & b)
1996 {
1997         return a.displayString() < b.displayString();
1998 }
1999
2000 ///
2001 bool operator==(DisplayPath const & a, DisplayPath const & b)
2002 {
2003         return a.displayString() == b.displayString();
2004 }
2005
2006
2007 void TabWorkArea::updateTabTexts()
2008 {
2009         size_t n = count();
2010         if (n == 0)
2011                 return;
2012         std::list<DisplayPath> paths;
2013         typedef std::list<DisplayPath>::iterator It;
2014
2015         // collect full names first: path into postfix, empty prefix and
2016         // filename without extension
2017         for (size_t i = 0; i < n; ++i) {
2018                 GuiWorkArea * i_wa = workArea(i);
2019                 FileName const fn = i_wa->bufferView().buffer().fileName();
2020                 paths.push_back(DisplayPath(i, fn));
2021         }
2022
2023         // go through path segments and see if it helps to make the path more unique
2024         bool somethingChanged = true;
2025         bool allFinal = false;
2026         while (somethingChanged && !allFinal) {
2027                 // adding path segments changes order
2028                 paths.sort();
2029
2030                 LYXERR(Debug::GUI, "updateTabTexts() iteration start");
2031                 somethingChanged = false;
2032                 allFinal = true;
2033
2034                 // find segments which are not unique (i.e. non-atomic)
2035                 It it = paths.begin();
2036                 It segStart = it;
2037                 QString segString = it->displayString();
2038                 for (; it != paths.end(); ++it) {
2039                         // look to the next item
2040                         It next = it;
2041                         ++next;
2042
2043                         // final?
2044                         allFinal = allFinal && it->final();
2045
2046                         LYXERR(Debug::GUI, "it = " << it->abs()
2047                                << " => " << it->displayString());
2048
2049                         // still the same segment?
2050                         QString nextString;
2051                         if ((next != paths.end()
2052                              && (nextString = next->displayString()) == segString))
2053                                 continue;
2054                         LYXERR(Debug::GUI, "segment ended");
2055
2056                         // only a trivial one with one element?
2057                         if (it == segStart) {
2058                                 // start new segment
2059                                 segStart = next;
2060                                 segString = nextString;
2061                                 continue;
2062                         }
2063
2064                         // We found a non-atomic segment
2065                         // We know that segStart <= it < next <= paths.end().
2066                         // The assertion below tells coverity about it.
2067                         LATTEST(segStart != paths.end());
2068                         QString dspString = segStart->forecastPathString();
2069                         LYXERR(Debug::GUI, "first forecast found for "
2070                                << segStart->abs() << " => " << dspString);
2071                         It sit = segStart;
2072                         ++sit;
2073                         // Shift path segments and hope for the best
2074                         // that it makes the path more unique.
2075                         somethingChanged = true;
2076                         bool moreUnique = false;
2077                         for (; sit != next; ++sit) {
2078                                 if (sit->forecastPathString() != dspString) {
2079                                         LYXERR(Debug::GUI, "different forecast found for "
2080                                                 << sit->abs() << " => " << sit->forecastPathString());
2081                                         moreUnique = true;
2082                                         break;
2083                                 }
2084                                 LYXERR(Debug::GUI, "same forecast found for "
2085                                         << sit->abs() << " => " << dspString);
2086                         }
2087
2088                         // if the path segment helped, add it. Otherwise add dots
2089                         bool dots = !moreUnique;
2090                         LYXERR(Debug::GUI, "using dots = " << dots);
2091                         for (sit = segStart; sit != next; ++sit) {
2092                                 sit->shiftPathSegment(dots);
2093                                 LYXERR(Debug::GUI, "shifting "
2094                                         << sit->abs() << " => " << sit->displayString());
2095                         }
2096
2097                         // start new segment
2098                         segStart = next;
2099                         segString = nextString;
2100                 }
2101         }
2102
2103         // set new tab titles
2104         for (It it = paths.begin(); it != paths.end(); ++it) {
2105                 int const tab_index = it->tab();
2106                 Buffer const & buf = workArea(tab_index)->bufferView().buffer();
2107                 QString tab_text = it->displayString().replace("&", "&&");
2108                 if (!buf.fileName().empty() && !buf.isClean())
2109                         tab_text += "*";
2110                 QString tab_tooltip = it->abs();
2111                 if (buf.hasReadonlyFlag()) {
2112                         setTabIcon(tab_index, QIcon(getPixmap("images/", "emblem-readonly", "svgz,png")));
2113                         tab_tooltip = qt_("%1 (read only)").arg(tab_tooltip);
2114                 } else
2115                         setTabIcon(tab_index, QIcon());
2116                 if (buf.notifiesExternalModification()) {
2117                         QString const warn = qt_("%1 (modified externally)");
2118                         tab_tooltip = warn.arg(tab_tooltip);
2119                         tab_text += QChar(0x26a0);
2120                 }
2121                 setTabText(tab_index, tab_text);
2122                 setTabToolTip(tab_index, tab_tooltip);
2123         }
2124 }
2125
2126
2127 void TabWorkArea::showContextMenu(const QPoint & pos)
2128 {
2129         // which tab?
2130         clicked_tab_ = static_cast<DragTabBar *>(tabBar())->tabAt(pos);
2131         if (clicked_tab_ == -1)
2132                 return;
2133
2134         // show tab popup
2135         QMenu popup;
2136         popup.addAction(QIcon(getPixmap("images/", "hidetab", "svgz,png")),
2137                 qt_("Hide tab"), this, SLOT(hideCurrentTab()));
2138         popup.addAction(QIcon(getPixmap("images/", "closetab", "svgz,png")),
2139                 qt_("Close tab"), this, SLOT(closeCurrentBuffer()));
2140         popup.exec(tabBar()->mapToGlobal(pos));
2141
2142         clicked_tab_ = -1;
2143 }
2144
2145
2146 void TabWorkArea::moveTab(int fromIndex, int toIndex)
2147 {
2148         QWidget * w = widget(fromIndex);
2149         QIcon icon = tabIcon(fromIndex);
2150         QString text = tabText(fromIndex);
2151
2152         setCurrentIndex(fromIndex);
2153         removeTab(fromIndex);
2154         insertTab(toIndex, w, icon, text);
2155         setCurrentIndex(toIndex);
2156 }
2157
2158
2159 DragTabBar::DragTabBar(QWidget* parent)
2160         : QTabBar(parent)
2161 {
2162         setAcceptDrops(true);
2163         setTabsClosable(!lyxrc.single_close_tab_button);
2164 }
2165
2166
2167 void DragTabBar::mousePressEvent(QMouseEvent * event)
2168 {
2169         if (event->button() == Qt::LeftButton)
2170                 dragStartPos_ = event->pos();
2171         QTabBar::mousePressEvent(event);
2172 }
2173
2174
2175 void DragTabBar::mouseMoveEvent(QMouseEvent * event)
2176 {
2177         // If the left button isn't pressed anymore then return
2178         if (!(event->buttons() & Qt::LeftButton))
2179                 return;
2180
2181         // If the distance is too small then return
2182         if ((event->pos() - dragStartPos_).manhattanLength()
2183             < QApplication::startDragDistance())
2184                 return;
2185
2186         // did we hit something after all?
2187         int tab = tabAt(dragStartPos_);
2188         if (tab == -1)
2189                 return;
2190
2191         // simulate button release to remove highlight from button
2192         int i = currentIndex();
2193         QMouseEvent me(QEvent::MouseButtonRelease, dragStartPos_,
2194                 event->button(), event->buttons(), 0);
2195         QTabBar::mouseReleaseEvent(&me);
2196         setCurrentIndex(i);
2197
2198         // initiate Drag
2199         QDrag * drag = new QDrag(this);
2200         QMimeData * mimeData = new QMimeData;
2201         // a crude way to distinguish tab-reodering drops from other ones
2202         mimeData->setData("action", "tab-reordering") ;
2203         drag->setMimeData(mimeData);
2204
2205         // get tab pixmap as cursor
2206         QRect r = tabRect(tab);
2207         QPixmap pixmap(r.size());
2208         render(&pixmap, - r.topLeft());
2209         drag->setPixmap(pixmap);
2210         drag->exec();
2211 }
2212
2213
2214 void DragTabBar::dragEnterEvent(QDragEnterEvent * event)
2215 {
2216         // Only accept if it's an tab-reordering request
2217         QMimeData const * m = event->mimeData();
2218         QStringList formats = m->formats();
2219         if (formats.contains("action")
2220             && m->data("action") == "tab-reordering")
2221                 event->acceptProposedAction();
2222 }
2223
2224
2225 void DragTabBar::dropEvent(QDropEvent * event)
2226 {
2227         int fromIndex = tabAt(dragStartPos_);
2228         int toIndex = tabAt(event->pos());
2229
2230         // Tell interested objects that
2231         if (fromIndex != toIndex)
2232                 tabMoveRequested(fromIndex, toIndex);
2233         event->acceptProposedAction();
2234 }
2235
2236
2237 GuiWorkAreaContainer::GuiWorkAreaContainer(GuiWorkArea * wa, QWidget * parent)
2238         : QWidget(parent), wa_(wa)
2239 {
2240         LASSERT(wa, return);
2241         Ui::WorkAreaUi::setupUi(this);
2242         layout()->addWidget(wa);
2243         connect(wa, SIGNAL(titleChanged(GuiWorkArea *)),
2244                 this, SLOT(updateDisplay()));
2245         connect(reloadPB, SIGNAL(clicked()), this, SLOT(reload()));
2246         connect(ignorePB, SIGNAL(clicked()), this, SLOT(ignore()));
2247         setMessageColour({notificationFrame}, {reloadPB, ignorePB});
2248         updateDisplay();
2249 }
2250
2251
2252 void GuiWorkAreaContainer::updateDisplay()
2253 {
2254         Buffer const & buf = wa_->bufferView().buffer();
2255         notificationFrame->setHidden(!buf.notifiesExternalModification());
2256         QString const label = qt_("<b>The file %1 changed on disk.</b>")
2257                 .arg(toqstr(buf.fileName().displayName()));
2258         externalModificationLabel->setText(label);
2259 }
2260
2261
2262 void GuiWorkAreaContainer::dispatch(FuncRequest f) const
2263 {
2264         lyx::dispatch(FuncRequest(LFUN_BUFFER_SWITCH,
2265                                   wa_->bufferView().buffer().absFileName()));
2266         lyx::dispatch(f);
2267 }
2268
2269
2270 void GuiWorkAreaContainer::reload() const
2271 {
2272         dispatch(FuncRequest(LFUN_BUFFER_RELOAD));
2273 }
2274
2275
2276 void GuiWorkAreaContainer::ignore() const
2277 {
2278         dispatch(FuncRequest(LFUN_BUFFER_EXTERNAL_MODIFICATION_CLEAR));
2279 }
2280
2281
2282 void GuiWorkAreaContainer::mouseDoubleClickEvent(QMouseEvent * event)
2283 {
2284         // prevent TabWorkArea from opening a new buffer on double click
2285         event->accept();
2286 }
2287
2288
2289 } // namespace frontend
2290 } // namespace lyx
2291
2292 #include "moc_GuiWorkArea.cpp"