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
  26 #include "Buffer.h"
  27 #include "BufferList.h"
  28 #include "BufferParams.h"
  29 #include "BufferView.h"
  30 #include "CoordCache.h"
  31 #include "Cursor.h"
  32 #include "Font.h"
  33 #include "FuncRequest.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), 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         setGuiView(gv);
 269         buffer.params().display_pixel_ratio = theGuiApp()->pixelRatio();
 270         setBuffer(buffer);
 271         init();
 272 }
 273
 274
 275 double GuiWorkArea::pixelRatio() const
 276 {
 277 #if QT_VERSION >= 0x050000
 278         return qt_scale_factor * devicePixelRatio();
 279 #else
 280         return 1.0;
 281 #endif
 282 }
 283
 284
 285 void GuiWorkArea::init()
 286 {
 287         // Setup the signals
 288         connect(&d->cursor_timeout_, SIGNAL(timeout()),
 289                 this, SLOT(toggleCursor()));
 290
 291         int const time = QApplication::cursorFlashTime() / 2;
 292         if (time > 0) {
 293                 d->cursor_timeout_.setInterval(time);
 294                 d->cursor_timeout_.start();
 295         } else {
 296                 // let's initialize this just to be safe
 297                 d->cursor_timeout_.setInterval(500);
 298         }
 299
 300         // With Qt4.5 a mouse event will happen before the first paint event
 301         // so make sure that the buffer view has an up to date metrics.
 302         d->buffer_view_->resize(viewport()->width(), viewport()->height());
 303         d->cursor_ = new frontend::CursorWidget();
 304         d->cursor_->hide();
 305
 306         setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 307         setAcceptDrops(true);
 308         setMouseTracking(true);
 309         setMinimumSize(100, 70);
 310         setFrameStyle(QFrame::NoFrame);
 311         updateWindowTitle();
 312
 313         //viewport()->setAutoFillBackground(false);
 314         // We don't need double-buffering nor SystemBackground on
 315         // the viewport because we have our own backing pixmap.
 316         //viewport()->setAttribute(Qt::WA_NoSystemBackground);
 317         viewport()->setAttribute(Qt::WA_OpaquePaintEvent);
 318
 319         setFocusPolicy(Qt::StrongFocus);
 320
 321         d->setCursorShape(Qt::IBeamCursor);
 322
 323         // This connection is closed at the same time as this is destroyed.
 324         d->synthetic_mouse_event_.timeout.timeout.connect([this](){
 325                         generateSyntheticMouseEvent();
 326                 });
 327
 328         LYXERR(Debug::GUI, "viewport width: " << viewport()->width()
 329                 << "  viewport height: " << viewport()->height());
 330
 331         // Enables input methods for asian languages.
 332         // Must be set when creating custom text editing widgets.
 333         setAttribute(Qt::WA_InputMethodEnabled, true);
 334
 335         d->dialog_mode_ = false;
 336 }
 337
 338
 339 GuiWorkArea::~GuiWorkArea()
 340 {
 341         // If something is wrong with the buffer, we can ignore it safely
 342         try {
 343                 d->buffer_view_->buffer().workAreaManager().remove(this);
 344         } catch(...) {}
 345         delete d->buffer_view_;
 346         delete d->cursor_;
 347         // Completer has a QObject parent and is thus automatically destroyed.
 348         // See #4758.
 349         // delete completer_;
 350         delete d;
 351 }
 352
 353
 354 Qt::CursorShape GuiWorkArea::cursorShape() const
 355 {
 356         return viewport()->cursor().shape();
 357 }
 358
 359
 360 void GuiWorkArea::Private::setCursorShape(Qt::CursorShape shape)
 361 {
 362         p->viewport()->setCursor(shape);
 363 }
 364
 365
 366 void GuiWorkArea::Private::updateCursorShape()
 367 {
 368         setCursorShape(buffer_view_->clickableInset()
 369                 ? Qt::PointingHandCursor : Qt::IBeamCursor);
 370 }
 371
 372
 373 void GuiWorkArea::setGuiView(GuiView & gv)
 374 {
 375         d->lyx_view_ = &gv;
 376 }
 377
 378
 379 void GuiWorkArea::setBuffer(Buffer & buffer)
 380 {
 381         delete d->buffer_view_;
 382         d->buffer_view_ = new BufferView(buffer);
 383         buffer.workAreaManager().add(this);
 384
 385         // HACK: Prevents an additional redraw when the scrollbar pops up
 386         // which regularily happens on documents with more than one page.
 387         // The policy  should be set to "Qt::ScrollBarAsNeeded" soon.
 388         // Since we have no geometry information yet, we assume that
 389         // a document needs a scrollbar if there is more then four
 390         // paragraph in the outermost text.
 391         if (buffer.text().paragraphs().size() > 4)
 392                 setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
 393         QTimer::singleShot(50, this, SLOT(fixVerticalScrollBar()));
 394         Q_EMIT bufferViewChanged();
 395 }
 396
 397
 398 void GuiWorkArea::fixVerticalScrollBar()
 399 {
 400         if (!isFullScreen())
 401                 setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
 402 }
 403
 404
 405 void GuiWorkArea::close()
 406 {
 407         d->lyx_view_->removeWorkArea(this);
 408 }
 409
 410
 411 void GuiWorkArea::setFullScreen(bool full_screen)
 412 {
 413         d->buffer_view_->setFullScreen(full_screen);
 414         setFrameStyle(QFrame::NoFrame);
 415         if (full_screen) {
 416                 setFrameStyle(QFrame::NoFrame);
 417                 if (lyxrc.full_screen_scrollbar)
 418                         setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 419         } else
 420                 setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
 421 }
 422
 423
 424 BufferView & GuiWorkArea::bufferView()
 425 {
 426         return *d->buffer_view_;
 427 }
 428
 429
 430 BufferView const & GuiWorkArea::bufferView() const
 431 {
 432         return *d->buffer_view_;
 433 }
 434
 435
 436 void GuiWorkArea::stopBlinkingCursor()
 437 {
 438         d->cursor_timeout_.stop();
 439         d->hideCursor();
 440 }
 441
 442
 443 void GuiWorkArea::startBlinkingCursor()
 444 {
 445         // do not show the cursor if the view is busy
 446         if (view().busy())
 447                 return;
 448
 449         Point p;
 450         int h = 0;
 451         d->buffer_view_->cursorPosAndHeight(p, h);
 452         // Don't start blinking if the cursor isn't on screen.
 453         if (!d->buffer_view_->cursorInView(p, h))
 454                 return;
 455
 456         d->showCursor();
 457
 458         //we're not supposed to cache this value.
 459         int const time = QApplication::cursorFlashTime() / 2;
 460         if (time <= 0)
 461                 return;
 462         d->cursor_timeout_.setInterval(time);
 463         d->cursor_timeout_.start();
 464 }
 465
 466
 467 void GuiWorkArea::redraw(bool update_metrics)
 468 {
 469         if (!isVisible())
 470                 // No need to redraw in this case.
 471                 return;
 472
 473         // No need to do anything if this is the current view. The BufferView
 474         // metrics are already up to date.
 475         if (update_metrics || d->lyx_view_ != guiApp->currentView()
 476                 || d->lyx_view_->currentWorkArea() != this) {
 477                 // FIXME: it would be nice to optimize for the off-screen case.
 478                 d->buffer_view_->cursor().fixIfBroken();
 479                 d->buffer_view_->updateMetrics();
 480                 d->buffer_view_->cursor().fixIfBroken();
 481         }
 482
 483         // update cursor position, because otherwise it has to wait until
 484         // the blinking interval is over
 485         if (d->cursor_visible_) {
 486                 d->hideCursor();
 487                 d->showCursor();
 488         }
 489
 490         LYXERR(Debug::WORKAREA, "WorkArea::redraw screen");
 491         viewport()->update();
 492
 493         /// \warning: scrollbar updating *must* be done after the BufferView is drawn
 494         /// because \c BufferView::updateScrollbar() is called in \c BufferView::draw().
 495         d->updateScrollbar();
 496         d->lyx_view_->updateStatusBar();
 497
 498         if (lyxerr.debugging(Debug::WORKAREA))
 499                 d->buffer_view_->coordCache().dump();
 500
 501         updateWindowTitle();
 502
 503         d->updateCursorShape();
 504 }
 505
 506
 507 // Keep in sync with GuiWorkArea::processKeySym below
 508 bool GuiWorkArea::queryKeySym(KeySymbol const & key, KeyModifier mod) const
 509 {
 510         return guiApp->queryKeySym(key, mod);
 511 }
 512
 513
 514 // Keep in sync with GuiWorkArea::queryKeySym above
 515 void GuiWorkArea::processKeySym(KeySymbol const & key, KeyModifier mod)
 516 {
 517         if (d->lyx_view_->isFullScreen() && d->lyx_view_->menuBar()->isVisible()
 518                 && lyxrc.full_screen_menubar) {
 519                 // FIXME HACK: we should not have to do this here. See related comment
 520                 // in GuiView::event() (QEvent::ShortcutOverride)
 521                 d->lyx_view_->menuBar()->hide();
 522         }
 523
 524         // In order to avoid bad surprise in the middle of an operation,
 525         // we better stop the blinking cursor...
 526         // the cursor gets restarted in GuiView::restartCursor()
 527         stopBlinkingCursor();
 528         guiApp->processKeySym(key, mod);
 529 }
 530
 531
 532 void GuiWorkArea::Private::dispatch(FuncRequest const & cmd)
 533 {
 534         // Handle drag&drop
 535         if (cmd.action() == LFUN_FILE_OPEN) {
 536                 DispatchResult dr;
 537                 lyx_view_->dispatch(cmd, dr);
 538                 return;
 539         }
 540
 541         bool const notJustMovingTheMouse =
 542                 cmd.action() != LFUN_MOUSE_MOTION || cmd.button() != mouse_button::none;
 543
 544         // In order to avoid bad surprise in the middle of an operation, we better stop
 545         // the blinking cursor.
 546         if (notJustMovingTheMouse)
 547                 p->stopBlinkingCursor();
 548
 549         buffer_view_->mouseEventDispatch(cmd);
 550
 551         // Skip these when selecting
 552         // FIXME: let GuiView take care of those.
 553         if (cmd.action() != LFUN_MOUSE_MOTION) {
 554                 completer_->updateVisibility(false, false);
 555                 lyx_view_->updateDialogs();
 556                 lyx_view_->updateStatusBar();
 557         }
 558
 559         // GUI tweaks except with mouse motion with no button pressed.
 560         if (notJustMovingTheMouse) {
 561                 // Slight hack: this is only called currently when we
 562                 // clicked somewhere, so we force through the display
 563                 // of the new status here.
 564                 // FIXME: let GuiView take care of those.
 565                 lyx_view_->clearMessage();
 566
 567                 // Show the cursor immediately after any operation
 568                 p->startBlinkingCursor();
 569         }
 570
 571         updateCursorShape();
 572 }
 573
 574
 575 void GuiWorkArea::Private::resizeBufferView()
 576 {
 577         // WARNING: Please don't put any code that will trigger a repaint here!
 578         // We are already inside a paint event.
 579         p->stopBlinkingCursor();
 580         // Warn our container (GuiView).
 581         p->busy(true);
 582
 583         Point point;
 584         int h = 0;
 585         buffer_view_->cursorPosAndHeight(point, h);
 586         bool const cursor_in_view = buffer_view_->cursorInView(point, h);
 587         buffer_view_->resize(p->viewport()->width(), p->viewport()->height());
 588         if (cursor_in_view)
 589                 buffer_view_->scrollToCursor();
 590         p->viewport()->update();
 591
 592         // Update scrollbars which might have changed due different
 593         // BufferView dimension. This is especially important when the
 594         // BufferView goes from zero-size to the real-size for the first time,
 595         // as the scrollbar paramters are then set for the first time.
 596         updateScrollbar();
 597
 598         need_resize_ = false;
 599         p->busy(false);
 600         // Eventually, restart the cursor after the resize event.
 601         // We might be resizing even if the focus is on another widget so we only
 602         // restart the cursor if we have the focus.
 603         if (p->hasFocus())
 604                 QTimer::singleShot(50, p, SLOT(startBlinkingCursor()));
 605 }
 606
 607
 608 void GuiWorkArea::Private::showCursor()
 609 {
 610         if (cursor_visible_)
 611                 return;
 612
 613         Point p;
 614         int h = 0;
 615         buffer_view_->cursorPosAndHeight(p, h);
 616         if (!buffer_view_->cursorInView(p, h))
 617                 return;
 618
 619         // RTL or not RTL
 620         bool l_shape = false;
 621         Font const & realfont = buffer_view_->cursor().real_current_font;
 622         BufferParams const & bp = buffer_view_->buffer().params();
 623         bool const samelang = realfont.language() == bp.language;
 624         bool const isrtl = realfont.isVisibleRightToLeft();
 625
 626         if (!samelang || isrtl != bp.language->rightToLeft())
 627                 l_shape = true;
 628
 629         // The ERT language hack needs fixing up
 630         if (realfont.language() == latex_language)
 631                 l_shape = false;
 632
 633         // show cursor on screen
 634         Cursor & cur = buffer_view_->cursor();
 635         bool completable = cur.inset().showCompletionCursor()
 636                 && completer_->completionAvailable()
 637                 && !completer_->popupVisible()
 638                 && !completer_->inlineVisible();
 639         cursor_visible_ = true;
 640         cursor_->recomputeWidth();
 641
 642         //int cur_x = buffer_view_->getPos(cur).x_;
 643         // We may have decided to slide the cursor row so that cursor
 644         // is visible.
 645         p.x_ -= buffer_view_->horizScrollOffset();
 646
 647         showCursor(p.x_, p.y_, h, l_shape, isrtl, completable);
 648 }
 649
 650
 651 void GuiWorkArea::Private::hideCursor()
 652 {
 653         if (!cursor_visible_)
 654                 return;
 655
 656         cursor_visible_ = false;
 657         removeCursor();
 658 }
 659
 660
 661 void GuiWorkArea::toggleCursor()
 662 {
 663         if (d->cursor_visible_)
 664                 d->hideCursor();
 665         else
 666                 d->showCursor();
 667 }
 668
 669
 670 void GuiWorkArea::Private::updateScrollbar()
 671 {
 672         // Prevent setRange() and setSliderPosition from causing recursive calls via
 673         // the signal valueChanged. (#10311)
 674         QObject::disconnect(p->verticalScrollBar(), SIGNAL(valueChanged(int)),
 675                             p, SLOT(scrollTo(int)));
 676         ScrollbarParameters const & scroll_ = buffer_view_->scrollbarParameters();
 677         p->verticalScrollBar()->setRange(scroll_.min, scroll_.max);
 678         p->verticalScrollBar()->setPageStep(scroll_.page_step);
 679         p->verticalScrollBar()->setSingleStep(scroll_.single_step);
 680         p->verticalScrollBar()->setSliderPosition(0);
 681         // Connect to the vertical scroll bar
 682         QObject::connect(p->verticalScrollBar(), SIGNAL(valueChanged(int)),
 683                          p, SLOT(scrollTo(int)));
 684 }
 685
 686
 687 void GuiWorkArea::scrollTo(int value)
 688 {
 689         stopBlinkingCursor();
 690         d->buffer_view_->scrollDocView(value, true);
 691
 692         if (lyxrc.cursor_follows_scrollbar) {
 693                 d->buffer_view_->setCursorFromScrollbar();
 694                 // FIXME: let GuiView take care of those.
 695                 d->lyx_view_->updateLayoutList();
 696         }
 697         // Show the cursor immediately after any operation.
 698         startBlinkingCursor();
 699         // FIXME QT5
 700 #ifdef Q_WS_X11
 701         QApplication::syncX();
 702 #endif
 703 }
 704
 705
 706 bool GuiWorkArea::event(QEvent * e)
 707 {
 708         switch (e->type()) {
 709         case QEvent::ToolTip: {
 710                 QHelpEvent * helpEvent = static_cast<QHelpEvent *>(e);
 711                 if (lyxrc.use_tooltip) {
 712                         QPoint pos = helpEvent->pos();
 713                         if (pos.x() < viewport()->width()) {
 714                                 QString s = toqstr(d->buffer_view_->toolTip(pos.x(), pos.y()));
 715                                 QToolTip::showText(helpEvent->globalPos(), formatToolTip(s,35));
 716                         }
 717                         else
 718                                 QToolTip::hideText();
 719                 }
 720                 // Don't forget to accept the event!
 721                 e->accept();
 722                 return true;
 723         }
 724
 725         case QEvent::ShortcutOverride:
 726                 // keyPressEvent is ShortcutOverride-aware and only accepts the event in
 727                 // this case
 728                 keyPressEvent(static_cast<QKeyEvent *>(e));
 729                 return e->isAccepted();
 730
 731         case QEvent::KeyPress: {
 732                 // We catch this event in order to catch the Tab or Shift+Tab key press
 733                 // which are otherwise reserved to focus switching between controls
 734                 // within a dialog.
 735                 QKeyEvent * ke = static_cast<QKeyEvent*>(e);
 736                 if ((ke->key() == Qt::Key_Tab && ke->modifiers() == Qt::NoModifier)
 737                         || (ke->key() == Qt::Key_Backtab && (
 738                                 ke->modifiers() == Qt::ShiftModifier
 739                                 || ke->modifiers() == Qt::NoModifier))) {
 740                         keyPressEvent(ke);
 741                         return true;
 742                 }
 743                 return QAbstractScrollArea::event(e);
 744         }
 745
 746         default:
 747                 return QAbstractScrollArea::event(e);
 748         }
 749         return false;
 750 }
 751
 752
 753 void GuiWorkArea::contextMenuEvent(QContextMenuEvent * e)
 754 {
 755         string name;
 756         if (e->reason() == QContextMenuEvent::Mouse)
 757                 // the menu name is set on mouse press
 758                 name = d->context_menu_name_;
 759         else {
 760                 QPoint pos = e->pos();
 761                 Cursor const & cur = d->buffer_view_->cursor();
 762                 if (e->reason() == QContextMenuEvent::Keyboard && cur.inTexted()) {
 763                         // Do not access the context menu of math right in front of before
 764                         // the cursor. This does not work when the cursor is in text.
 765                         Inset * inset = cur.paragraph().getInset(cur.pos());
 766                         if (inset && inset->asInsetMath())
 767                                 --pos.rx();
 768                         else if (cur.pos() > 0) {
 769                                 Inset * inset = cur.paragraph().getInset(cur.pos() - 1);
 770                                 if (inset)
 771                                         ++pos.rx();
 772                         }
 773                 }
 774                 name = d->buffer_view_->contextMenu(pos.x(), pos.y());
 775         }
 776
 777         if (name.empty()) {
 778                 e->accept();
 779                 return;
 780         }
 781         // always show mnemonics when the keyboard is used to show the context menu
 782         // FIXME: This should be fixed in Qt itself
 783         bool const keyboard = (e->reason() == QContextMenuEvent::Keyboard);
 784         QMenu * menu = guiApp->menus().menu(toqstr(name), *d->lyx_view_, keyboard);
 785         if (!menu) {
 786                 e->accept();
 787                 return;
 788         }
 789         // Position the menu to the right.
 790         // FIXME: menu position should be different for RTL text.
 791         menu->exec(e->globalPos());
 792         e->accept();
 793 }
 794
 795
 796 void GuiWorkArea::focusInEvent(QFocusEvent * e)
 797 {
 798         LYXERR(Debug::DEBUG, "GuiWorkArea::focusInEvent(): " << this << endl);
 799         if (d->lyx_view_->currentWorkArea() != this) {
 800                 d->lyx_view_->setCurrentWorkArea(this);
 801                 d->lyx_view_->currentWorkArea()->bufferView().buffer().updateBuffer();
 802         }
 803
 804         startBlinkingCursor();
 805         QAbstractScrollArea::focusInEvent(e);
 806 }
 807
 808
 809 void GuiWorkArea::focusOutEvent(QFocusEvent * e)
 810 {
 811         LYXERR(Debug::DEBUG, "GuiWorkArea::focusOutEvent(): " << this << endl);
 812         stopBlinkingCursor();
 813         QAbstractScrollArea::focusOutEvent(e);
 814 }
 815
 816
 817 void GuiWorkArea::mousePressEvent(QMouseEvent * e)
 818 {
 819         if (d->dc_event_.active && d->dc_event_ == *e) {
 820                 d->dc_event_.active = false;
 821                 FuncRequest cmd(LFUN_MOUSE_TRIPLE, e->x(), e->y(),
 822                         q_button_state(e->button()), q_key_state(e->modifiers()));
 823                 d->dispatch(cmd);
 824                 e->accept();
 825                 return;
 826         }
 827
 828 #if (QT_VERSION < 0x050000) && !defined(__HAIKU__)
 829         inputContext()->reset();
 830 #endif
 831
 832         FuncRequest const cmd(LFUN_MOUSE_PRESS, e->x(), e->y(),
 833                         q_button_state(e->button()), q_key_state(e->modifiers()));
 834         d->dispatch(cmd);
 835
 836         // Save the context menu on mouse press, because also the mouse
 837         // cursor is set on mouse press. Afterwards, we can either release
 838         // the mousebutton somewhere else, or the cursor might have moved
 839         // due to the DEPM. We need to do this after the mouse has been
 840         // set in dispatch(), because the selection state might change.
 841         if (e->button() == Qt::RightButton)
 842                 d->context_menu_name_ = d->buffer_view_->contextMenu(e->x(), e->y());
 843
 844         e->accept();
 845 }
 846
 847
 848 void GuiWorkArea::mouseReleaseEvent(QMouseEvent * e)
 849 {
 850         if (d->synthetic_mouse_event_.timeout.running())
 851                 d->synthetic_mouse_event_.timeout.stop();
 852
 853         FuncRequest const cmd(LFUN_MOUSE_RELEASE, e->x(), e->y(),
 854                         q_button_state(e->button()), q_key_state(e->modifiers()));
 855         d->dispatch(cmd);
 856         e->accept();
 857 }
 858
 859
 860 void GuiWorkArea::mouseMoveEvent(QMouseEvent * e)
 861 {
 862         // we kill the triple click if we move
 863         doubleClickTimeout();
 864         FuncRequest cmd(LFUN_MOUSE_MOTION, e->x(), e->y(),
 865                         q_motion_state(e->buttons()), q_key_state(e->modifiers()));
 866
 867         e->accept();
 868
 869         // If we're above or below the work area...
 870         if ((e->y() <= 20 || e->y() >= viewport()->height() - 20)
 871                         && e->buttons() == mouse_button::button1) {
 872                 // Make sure only a synthetic event can cause a page scroll,
 873                 // so they come at a steady rate:
 874                 if (e->y() <= 20)
 875                         // _Force_ a scroll up:
 876                         cmd.set_y(e->y() - 21);
 877                 else
 878                         cmd.set_y(e->y() + 21);
 879                 // Store the event, to be handled when the timeout expires.
 880                 d->synthetic_mouse_event_.cmd = cmd;
 881
 882                 if (d->synthetic_mouse_event_.timeout.running()) {
 883                         // Discard the event. Note that it _may_ be handled
 884                         // when the timeout expires if
 885                         // synthetic_mouse_event_.cmd has not been overwritten.
 886                         // Ie, when the timeout expires, we handle the
 887                         // most recent event but discard all others that
 888                         // occurred after the one used to start the timeout
 889                         // in the first place.
 890                         return;
 891                 }
 892
 893                 d->synthetic_mouse_event_.restart_timeout = true;
 894                 d->synthetic_mouse_event_.timeout.start();
 895                 // Fall through to handle this event...
 896
 897         } else if (d->synthetic_mouse_event_.timeout.running()) {
 898                 // Store the event, to be possibly handled when the timeout
 899                 // expires.
 900                 // Once the timeout has expired, normal control is returned
 901                 // to mouseMoveEvent (restart_timeout = false).
 902                 // This results in a much smoother 'feel' when moving the
 903                 // mouse back into the work area.
 904                 d->synthetic_mouse_event_.cmd = cmd;
 905                 d->synthetic_mouse_event_.restart_timeout = false;
 906                 return;
 907         }
 908         d->dispatch(cmd);
 909 }
 910
 911
 912 void GuiWorkArea::wheelEvent(QWheelEvent * ev)
 913 {
 914         // Wheel rotation by one notch results in a delta() of 120 (see
 915         // documentation of QWheelEvent)
 916         double const delta = ev->delta() / 120.0;
 917         bool zoom = false;
 918         switch (lyxrc.scroll_wheel_zoom) {
 919         case LyXRC::SCROLL_WHEEL_ZOOM_CTRL:
 920                 zoom = ev->modifiers() & Qt::ControlModifier;
 921                 zoom &= !(ev->modifiers() & (Qt::ShiftModifier | Qt::AltModifier));
 922                 break;
 923         case LyXRC::SCROLL_WHEEL_ZOOM_SHIFT:
 924                 zoom = ev->modifiers() & Qt::ShiftModifier;
 925                 zoom &= !(ev->modifiers() & (Qt::ControlModifier | Qt::AltModifier));
 926                 break;
 927         case LyXRC::SCROLL_WHEEL_ZOOM_ALT:
 928                 zoom = ev->modifiers() & Qt::AltModifier;
 929                 zoom &= !(ev->modifiers() & (Qt::ShiftModifier | Qt::ControlModifier));
 930                 break;
 931         case LyXRC::SCROLL_WHEEL_ZOOM_OFF:
 932                 break;
 933         }
 934         if (zoom) {
 935                 docstring arg = convert<docstring>(int(5 * delta));
 936                 lyx::dispatch(FuncRequest(LFUN_BUFFER_ZOOM_IN, arg));
 937                 return;
 938         }
 939
 940         // Take into account the desktop wide settings.
 941         int const lines = qApp->wheelScrollLines();
 942         int const page_step = verticalScrollBar()->pageStep();
 943         // Test if the wheel mouse is set to one screen at a time.
 944         // This is according to
 945         // https://doc.qt.io/qt-5/qapplication.html#wheelScrollLines-prop
 946         int scroll_value =
 947                 min(lines * verticalScrollBar()->singleStep(), page_step);
 948
 949         // Take into account the rotation and the user preferences.
 950         scroll_value = int(scroll_value * delta * lyxrc.mouse_wheel_speed);
 951         LYXERR(Debug::SCROLLING, "wheelScrollLines = " << lines
 952                         << " delta = " << delta << " scroll_value = " << scroll_value
 953                         << " page_step = " << page_step);
 954         // Now scroll.
 955         verticalScrollBar()->setValue(verticalScrollBar()->value() - scroll_value);
 956
 957         ev->accept();
 958 }
 959
 960
 961 void GuiWorkArea::generateSyntheticMouseEvent()
 962 {
 963         int const e_y = d->synthetic_mouse_event_.cmd.y();
 964         int const wh = d->buffer_view_->workHeight();
 965         bool const up = e_y < 0;
 966         bool const down = e_y > wh;
 967
 968         // Set things off to generate the _next_ 'pseudo' event.
 969         int step = 50;
 970         if (d->synthetic_mouse_event_.restart_timeout) {
 971                 // This is some magic formulae to determine the speed
 972                 // of scrolling related to the position of the mouse.
 973                 int time = 200;
 974                 if (up || down) {
 975                         int dist = up ? -e_y : e_y - wh;
 976                         time = max(min(200, 250000 / (dist * dist)), 1) ;
 977
 978                         if (time < 40) {
 979                                 step = 80000 / (time * time);
 980                                 time = 40;
 981                         }
 982                 }
 983                 d->synthetic_mouse_event_.timeout.setTimeout(time);
 984                 d->synthetic_mouse_event_.timeout.start();
 985         }
 986
 987         // Can we scroll further ?
 988         int const value = verticalScrollBar()->value();
 989         if (value == verticalScrollBar()->maximum()
 990                   || value == verticalScrollBar()->minimum()) {
 991                 d->synthetic_mouse_event_.timeout.stop();
 992                 return;
 993         }
 994
 995         // Scroll
 996         if (step <= 2 * wh) {
 997                 d->buffer_view_->scroll(up ? -step : step);
 998                 d->buffer_view_->updateMetrics();
 999         } else {
1000                 d->buffer_view_->scrollDocView(value + (up ? -step : step), false);
1001         }
1002
1003         // In which paragraph do we have to set the cursor ?
1004         Cursor & cur = d->buffer_view_->cursor();
1005         // FIXME: we don't know how to handle math.
1006         Text * text = cur.text();
1007         if (!text)
1008                 return;
1009         TextMetrics const & tm = d->buffer_view_->textMetrics(text);
1010
1011         // Quit gracefully if there are no metrics, since otherwise next
1012         // line would crash (bug #10324).
1013         // This situation seems related to a (not yet understood) timing problem.
1014         if (tm.empty())
1015                 return;
1016
1017         pair<pit_type, const ParagraphMetrics *> pp = up ? tm.first() : tm.last();
1018         ParagraphMetrics const & pm = *pp.second;
1019         pit_type const pit = pp.first;
1020
1021         if (pm.rows().empty())
1022                 return;
1023
1024         // Find the row at which we set the cursor.
1025         RowList::const_iterator rit = pm.rows().begin();
1026         RowList::const_iterator rlast = pm.rows().end();
1027         int yy = pm.position() - pm.ascent();
1028         for (--rlast; rit != rlast; ++rit) {
1029                 int h = rit->height();
1030                 if ((up && yy + h > 0)
1031                           || (!up && yy + h > wh - defaultRowHeight()))
1032                         break;
1033                 yy += h;
1034         }
1035
1036         // Find the position of the cursor
1037         bool bound;
1038         int x = d->synthetic_mouse_event_.cmd.x();
1039         pos_type const pos = tm.getPosNearX(*rit, x, bound);
1040
1041         // Set the cursor
1042         cur.pit() = pit;
1043         cur.pos() = pos;
1044         cur.boundary(bound);
1045
1046         d->buffer_view_->buffer().changed(false);
1047         return;
1048 }
1049
1050
1051 void GuiWorkArea::keyPressEvent(QKeyEvent * ev)
1052 {
1053         // this is also called for ShortcutOverride events. In this case, one must
1054         // not act but simply accept the event explicitly.
1055         bool const act = (ev->type() != QEvent::ShortcutOverride);
1056
1057         // Do not process here some keys if dialog_mode_ is set
1058         if (d->dialog_mode_
1059                 && (ev->modifiers() == Qt::NoModifier
1060                     || ev->modifiers() == Qt::ShiftModifier)
1061                 && (ev->key() == Qt::Key_Escape
1062                     || ev->key() == Qt::Key_Enter
1063                     || ev->key() == Qt::Key_Return)
1064             ) {
1065                 ev->ignore();
1066                 return;
1067         }
1068
1069         // intercept some keys if completion popup is visible
1070         if (d->completer_->popupVisible()) {
1071                 switch (ev->key()) {
1072                 case Qt::Key_Enter:
1073                 case Qt::Key_Return:
1074                         if (act)
1075                                 d->completer_->activate();
1076                         ev->accept();
1077                         return;
1078                 }
1079         }
1080
1081         // do nothing if there are other events
1082         // (the auto repeated events come too fast)
1083         // it looks like this is only needed on X11
1084 #if defined(Q_WS_X11) || defined(QPA_XCB)
1085         // FIXME: this is a weird way to implement event compression. Also, this is
1086         // broken with IBus.
1087         if (act && qApp->hasPendingEvents() && ev->isAutoRepeat()) {
1088                 switch (ev->key()) {
1089                 case Qt::Key_PageDown:
1090                 case Qt::Key_PageUp:
1091                 case Qt::Key_Left:
1092                 case Qt::Key_Right:
1093                 case Qt::Key_Up:
1094                 case Qt::Key_Down:
1095                         LYXERR(Debug::KEY, "system is busy: scroll key event ignored");
1096                         ev->ignore();
1097                         return;
1098                 }
1099         }
1100 #endif
1101
1102         KeyModifier const m = q_key_state(ev->modifiers());
1103
1104         std::string str;
1105         if (m & ShiftModifier)
1106                 str += "Shift-";
1107         if (m & ControlModifier)
1108                 str += "Control-";
1109         if (m & AltModifier)
1110                 str += "Alt-";
1111         if (m & MetaModifier)
1112                 str += "Meta-";
1113
1114         if (act)
1115                 LYXERR(Debug::KEY, " count: " << ev->count() << " text: " << ev->text()
1116                        << " isAutoRepeat: " << ev->isAutoRepeat() << " key: " << ev->key()
1117                        << " keyState: " << str);
1118
1119         KeySymbol sym;
1120         setKeySymbol(&sym, ev);
1121         if (sym.isOK()) {
1122                 if (act) {
1123                         processKeySym(sym, m);
1124                         ev->accept();
1125                 } else
1126                         ev->setAccepted(queryKeySym(sym, m));
1127         } else {
1128                 ev->ignore();
1129         }
1130 }
1131
1132
1133 void GuiWorkArea::doubleClickTimeout()
1134 {
1135         d->dc_event_.active = false;
1136 }
1137
1138
1139 void GuiWorkArea::mouseDoubleClickEvent(QMouseEvent * ev)
1140 {
1141         d->dc_event_ = DoubleClick(ev);
1142         QTimer::singleShot(QApplication::doubleClickInterval(), this,
1143                         SLOT(doubleClickTimeout()));
1144         FuncRequest cmd(LFUN_MOUSE_DOUBLE, ev->x(), ev->y(),
1145                         q_button_state(ev->button()), q_key_state(ev->modifiers()));
1146         d->dispatch(cmd);
1147         ev->accept();
1148 }
1149
1150
1151 void GuiWorkArea::resizeEvent(QResizeEvent * ev)
1152 {
1153         QAbstractScrollArea::resizeEvent(ev);
1154         d->need_resize_ = true;
1155         ev->accept();
1156 }
1157
1158
1159 void GuiWorkArea::paintEvent(QPaintEvent * ev)
1160 {
1161         // LYXERR(Debug::PAINTING, "paintEvent begin: x: " << rc.x()
1162         //      << " y: " << rc.y() << " w: " << rc.width() << " h: " << rc.height());
1163
1164         if (d->needResize()) {
1165                 d->resizeBufferView();
1166                 if (d->cursor_visible_) {
1167                         d->hideCursor();
1168                         d->showCursor();
1169                 }
1170         }
1171
1172         GuiPainter pain(viewport(), pixelRatio());
1173         d->buffer_view_->draw(pain);
1174
1175         d->cursor_->draw(pain);
1176         ev->accept();
1177 }
1178
1179
1180 void GuiWorkArea::Private::showCursor(int x, int y, int h,
1181         bool l_shape, bool rtl, bool completable)
1182 {
1183         if (schedule_redraw_) {
1184                 // This happens when a graphic conversion is finished. As we don't know
1185                 // the size of the new graphics, it's better the update everything.
1186                 // We can't use redraw() here because this would trigger a infinite
1187                 // recursive loop with showCursor().
1188                 buffer_view_->resize(p->viewport()->width(), p->viewport()->height());
1189                 p->viewport()->update();
1190                 updateScrollbar();
1191                 schedule_redraw_ = false;
1192                 // Show the cursor immediately after the update.
1193                 hideCursor();
1194                 p->toggleCursor();
1195                 return;
1196         }
1197
1198         cursor_->update(x, y, h, l_shape, rtl, completable);
1199         cursor_->show();
1200         p->viewport()->update(cursor_->rect());
1201 }
1202
1203
1204 void GuiWorkArea::Private::removeCursor()
1205 {
1206         cursor_->hide();
1207         //if (!qApp->focusWidget())
1208                 p->viewport()->update(cursor_->rect());
1209 }
1210
1211
1212 void GuiWorkArea::inputMethodEvent(QInputMethodEvent * e)
1213 {
1214 //FIXME Broken Feature !!
1215 // I do not think that we are supposed to paint inside this event. Shall we
1216 // just let TextMetrics::breakRow add this to the relevant Row object?
1217 #if 0
1218         QString const & commit_string = e->commitString();
1219         docstring const & preedit_string
1220                 = qstring_to_ucs4(e->preeditString());
1221
1222         if (!commit_string.isEmpty()) {
1223
1224                 LYXERR(Debug::KEY, "preeditString: " << e->preeditString()
1225                         << " commitString: " << e->commitString());
1226
1227                 int key = 0;
1228
1229                 // FIXME Iwami 04/01/07: we should take care also of UTF16 surrogates here.
1230                 for (int i = 0; i != commit_string.size(); ++i) {
1231                         QKeyEvent ev(QEvent::KeyPress, key, Qt::NoModifier, commit_string[i]);
1232                         keyPressEvent(&ev);
1233                 }
1234         }
1235
1236         // Hide the cursor during the kana-kanji transformation.
1237         if (preedit_string.empty())
1238                 startBlinkingCursor();
1239         else
1240                 stopBlinkingCursor();
1241
1242         // last_width : for checking if last preedit string was/wasn't empty.
1243         // FIXME THREAD && FIXME
1244         // We could have more than one work area, right?
1245         static bool last_width = false;
1246         if (!last_width && preedit_string.empty()) {
1247                 // if last_width is last length of preedit string.
1248                 e->accept();
1249                 return;
1250         }
1251
1252         d->buffer_view_->updateMetrics();
1253         viewport()->update();
1254         // FIXME: shall we use real_current_font here? (see #10478)
1255         FontInfo font = d->buffer_view_->cursor().getFont().fontInfo();
1256         FontMetrics const & fm = theFontMetrics(font);
1257         int height = fm.maxHeight();
1258         int cur_x = d->cursor_->rect().left();
1259         int cur_y = d->cursor_->rect().bottom();
1260
1261         // redraw area of preedit string.
1262         viewport()->update(0, cur_y - height, viewport()->width(),
1263                 (height + 1) * d->preedit_lines_);
1264
1265         if (preedit_string.empty()) {
1266                 last_width = false;
1267                 d->preedit_lines_ = 1;
1268                 e->accept();
1269                 return;
1270         }
1271         last_width = true;
1272
1273         // att : stores an IM attribute.
1274         QList<QInputMethodEvent::Attribute> const & att = e->attributes();
1275
1276         // get attributes of input method cursor.
1277         // cursor_pos : cursor position in preedit string.
1278         size_t cursor_pos = 0;
1279         bool cursor_is_visible = false;
1280         for (int i = 0; i != att.size(); ++i) {
1281                 if (att.at(i).type == QInputMethodEvent::Cursor) {
1282                         cursor_pos = att.at(i).start;
1283                         cursor_is_visible = att.at(i).length != 0;
1284                         break;
1285                 }
1286         }
1287
1288         size_t preedit_length = preedit_string.length();
1289
1290         // get position of selection in input method.
1291         // FIXME: isn't there a way to do this simplier?
1292         // rStart : cursor position in selected string in IM.
1293         size_t rStart = 0;
1294         // rLength : selected string length in IM.
1295         size_t rLength = 0;
1296         if (cursor_pos < preedit_length) {
1297                 for (int i = 0; i != att.size(); ++i) {
1298                         if (att.at(i).type == QInputMethodEvent::TextFormat) {
1299                                 if (att.at(i).start <= int(cursor_pos)
1300                                         && int(cursor_pos) < att.at(i).start + att.at(i).length) {
1301                                                 rStart = att.at(i).start;
1302                                                 rLength = att.at(i).length;
1303                                                 if (!cursor_is_visible)
1304                                                         cursor_pos += rLength;
1305                                                 break;
1306                                 }
1307                         }
1308                 }
1309         }
1310         else {
1311                 rStart = cursor_pos;
1312                 rLength = 0;
1313         }
1314
1315         int const right_margin = d->buffer_view_->rightMargin();
1316         Painter::preedit_style ps;
1317         // Most often there would be only one line:
1318         d->preedit_lines_ = 1;
1319         for (size_t pos = 0; pos != preedit_length; ++pos) {
1320                 char_type const typed_char = preedit_string[pos];
1321                 // reset preedit string style
1322                 ps = Painter::preedit_default;
1323
1324                 // if we reached the right extremity of the screen, go to next line.
1325                 if (cur_x + fm.width(typed_char) > viewport()->width() - right_margin) {
1326                         cur_x = right_margin;
1327                         cur_y += height + 1;
1328                         ++d->preedit_lines_;
1329                 }
1330                 // preedit strings are displayed with dashed underline
1331                 // and partial strings are displayed white on black indicating
1332                 // that we are in selecting mode in the input method.
1333                 // FIXME: rLength == preedit_length is not a changing condition
1334                 // FIXME: should be put out of the loop.
1335                 if (pos >= rStart
1336                         && pos < rStart + rLength
1337                         && !(cursor_pos < rLength && rLength == preedit_length))
1338                         ps = Painter::preedit_selecting;
1339
1340                 if (pos == cursor_pos
1341                         && (cursor_pos < rLength && rLength == preedit_length))
1342                         ps = Painter::preedit_cursor;
1343
1344                 // draw one character and update cur_x.
1345                 GuiPainter pain(d->screen_, pixelRatio());
1346                 cur_x += pain.preeditText(cur_x, cur_y, typed_char, font, ps);
1347         }
1348
1349         // update the preedit string screen area.
1350         viewport()->update(0, cur_y - d->preedit_lines_*height, viewport()->width(),
1351                 (height + 1) * d->preedit_lines_);
1352 #endif
1353
1354         // Don't forget to accept the event!
1355         e->accept();
1356 }
1357
1358
1359 QVariant GuiWorkArea::inputMethodQuery(Qt::InputMethodQuery query) const
1360 {
1361         QRect cur_r(0, 0, 0, 0);
1362         switch (query) {
1363                 // this is the CJK-specific composition window position and
1364                 // the context menu position when the menu key is pressed.
1365                 case Qt::ImMicroFocus:
1366                         cur_r = d->cursor_->rect();
1367                         if (d->preedit_lines_ != 1)
1368                                 cur_r.moveLeft(10);
1369                         cur_r.moveBottom(cur_r.bottom()
1370                                 + cur_r.height() * (d->preedit_lines_ - 1));
1371                         // return lower right of cursor in LyX.
1372                         return cur_r;
1373                 default:
1374                         return QWidget::inputMethodQuery(query);
1375         }
1376 }
1377
1378
1379 void GuiWorkArea::updateWindowTitle()
1380 {
1381         Buffer const & buf = bufferView().buffer();
1382         if (buf.fileName() != d->file_name_
1383             || buf.params().shell_escape != d->shell_escape_
1384             || buf.hasReadonlyFlag() != d->read_only_
1385             || buf.lyxvc().vcstatus() != d->vc_status_
1386             || buf.isClean() != d->clean_
1387             || buf.notifiesExternalModification() != d->externally_modified_) {
1388                 d->file_name_ = buf.fileName();
1389                 d->shell_escape_ = buf.params().shell_escape;
1390                 d->read_only_ = buf.hasReadonlyFlag();
1391                 d->vc_status_ = buf.lyxvc().vcstatus();
1392                 d->clean_ = buf.isClean();
1393                 d->externally_modified_ = buf.notifiesExternalModification();
1394                 Q_EMIT titleChanged(this);
1395         }
1396 }
1397
1398
1399 bool GuiWorkArea::isFullScreen() const
1400 {
1401         return d->lyx_view_ && d->lyx_view_->isFullScreen();
1402 }
1403
1404
1405 void GuiWorkArea::scheduleRedraw()
1406 {
1407         d->schedule_redraw_ = true;
1408 }
1409
1410
1411 bool GuiWorkArea::inDialogMode() const
1412 {
1413         return d->dialog_mode_;
1414 }
1415
1416
1417 void GuiWorkArea::setDialogMode(bool mode)
1418 {
1419         d->dialog_mode_ = mode;
1420 }
1421
1422
1423 GuiCompleter & GuiWorkArea::completer()
1424 {
1425         return *d->completer_;
1426 }
1427
1428 GuiView const & GuiWorkArea::view() const
1429 {
1430         return *d->lyx_view_;
1431 }
1432
1433
1434 GuiView & GuiWorkArea::view()
1435 {
1436         return *d->lyx_view_;
1437 }
1438
1439 ////////////////////////////////////////////////////////////////////
1440 //
1441 // EmbeddedWorkArea
1442 //
1443 ////////////////////////////////////////////////////////////////////
1444
1445
1446 EmbeddedWorkArea::EmbeddedWorkArea(QWidget * w): GuiWorkArea(w)
1447 {
1448         support::TempFile tempfile("embedded.internal");
1449         tempfile.setAutoRemove(false);
1450         buffer_ = theBufferList().newInternalBuffer(tempfile.name().absFileName());
1451         buffer_->setUnnamed(true);
1452         buffer_->setFullyLoaded(true);
1453         setBuffer(*buffer_);
1454         setDialogMode(true);
1455 }
1456
1457
1458 EmbeddedWorkArea::~EmbeddedWorkArea()
1459 {
1460         // No need to destroy buffer and bufferview here, because it is done
1461         // in theBufferList() destruction loop at application exit
1462 }
1463
1464
1465 void EmbeddedWorkArea::closeEvent(QCloseEvent * ev)
1466 {
1467         disable();
1468         GuiWorkArea::closeEvent(ev);
1469 }
1470
1471
1472 void EmbeddedWorkArea::hideEvent(QHideEvent * ev)
1473 {
1474         disable();
1475         GuiWorkArea::hideEvent(ev);
1476 }
1477
1478
1479 QSize EmbeddedWorkArea::sizeHint () const
1480 {
1481         // FIXME(?):
1482         // GuiWorkArea sets the size to the screen's viewport
1483         // by returning a value this gets overridden
1484         // EmbeddedWorkArea is now sized to fit in the layout
1485         // of the parent, and has a minimum size set in GuiWorkArea
1486         // which is what we return here
1487         return QSize(100, 70);
1488 }
1489
1490
1491 void EmbeddedWorkArea::disable()
1492 {
1493         stopBlinkingCursor();
1494         if (view().currentWorkArea() != this)
1495                 return;
1496         // No problem if currentMainWorkArea() is 0 (setCurrentWorkArea()
1497         // tolerates it and shows the background logo), what happens if
1498         // an EmbeddedWorkArea is closed after closing all document WAs
1499         view().setCurrentWorkArea(view().currentMainWorkArea());
1500 }
1501
1502 ////////////////////////////////////////////////////////////////////
1503 //
1504 // TabWorkArea
1505 //
1506 ////////////////////////////////////////////////////////////////////
1507
1508 #ifdef Q_OS_MAC
1509 class NoTabFrameMacStyle : public QProxyStyle {
1510 public:
1511         ///
1512         QRect subElementRect(SubElement element, const QStyleOption * option,
1513                              const QWidget * widget = 0) const
1514         {
1515                 QRect rect = QProxyStyle::subElementRect(element, option, widget);
1516                 bool noBar = static_cast<QTabWidget const *>(widget)->count() <= 1;
1517
1518                 // The Qt Mac style puts the contents into a 3 pixel wide box
1519                 // which looks very ugly and not like other Mac applications.
1520                 // Hence we remove this here, and moreover the 16 pixel round
1521                 // frame above if the tab bar is hidden.
1522                 if (element == QStyle::SE_TabWidgetTabContents) {
1523                         rect.adjust(- rect.left(), 0, rect.left(), 0);
1524                         if (noBar)
1525                                 rect.setTop(0);
1526                 }
1527
1528                 return rect;
1529         }
1530 };
1531
1532 NoTabFrameMacStyle noTabFrameMacStyle;
1533 #endif
1534
1535
1536 TabWorkArea::TabWorkArea(QWidget * parent)
1537         : QTabWidget(parent), clicked_tab_(-1), midpressed_tab_(-1)
1538 {
1539 #ifdef Q_OS_MAC
1540         setStyle(&noTabFrameMacStyle);
1541 #endif
1542
1543         QPalette pal = palette();
1544         pal.setColor(QPalette::Active, QPalette::Button,
1545                 pal.color(QPalette::Active, QPalette::Window));
1546         pal.setColor(QPalette::Disabled, QPalette::Button,
1547                 pal.color(QPalette::Disabled, QPalette::Window));
1548         pal.setColor(QPalette::Inactive, QPalette::Button,
1549                 pal.color(QPalette::Inactive, QPalette::Window));
1550
1551         QObject::connect(this, SIGNAL(currentChanged(int)),
1552                 this, SLOT(on_currentTabChanged(int)));
1553
1554         closeBufferButton = new QToolButton(this);
1555         closeBufferButton->setPalette(pal);
1556         // FIXME: rename the icon to closebuffer.png
1557         closeBufferButton->setIcon(QIcon(getPixmap("images/", "closetab", "svgz,png")));
1558         closeBufferButton->setText("Close File");
1559         closeBufferButton->setAutoRaise(true);
1560         closeBufferButton->setCursor(Qt::ArrowCursor);
1561         closeBufferButton->setToolTip(qt_("Close File"));
1562         closeBufferButton->setEnabled(true);
1563         QObject::connect(closeBufferButton, SIGNAL(clicked()),
1564                 this, SLOT(closeCurrentBuffer()));
1565         setCornerWidget(closeBufferButton, Qt::TopRightCorner);
1566
1567         // setup drag'n'drop
1568         QTabBar* tb = new DragTabBar;
1569         connect(tb, SIGNAL(tabMoveRequested(int, int)),
1570                 this, SLOT(moveTab(int, int)));
1571         tb->setElideMode(Qt::ElideNone);
1572         setTabBar(tb);
1573
1574         // make us responsible for the context menu of the tabbar
1575         tb->setContextMenuPolicy(Qt::CustomContextMenu);
1576         connect(tb, SIGNAL(customContextMenuRequested(const QPoint &)),
1577                 this, SLOT(showContextMenu(const QPoint &)));
1578         connect(tb, SIGNAL(tabCloseRequested(int)),
1579                 this, SLOT(closeTab(int)));
1580
1581         setUsesScrollButtons(true);
1582 }
1583
1584
1585 void TabWorkArea::mousePressEvent(QMouseEvent *me)
1586 {
1587         if (me->button() == Qt::MidButton)
1588                 midpressed_tab_ = tabBar()->tabAt(me->pos());
1589         else
1590                 QTabWidget::mousePressEvent(me);
1591 }
1592
1593
1594 void TabWorkArea::mouseReleaseEvent(QMouseEvent *me)
1595 {
1596         if (me->button() == Qt::MidButton) {
1597                 int const midreleased_tab = tabBar()->tabAt(me->pos());
1598                 if (midpressed_tab_ == midreleased_tab && posIsTab(me->pos()))
1599                         closeTab(midreleased_tab);
1600         } else
1601                 QTabWidget::mouseReleaseEvent(me);
1602 }
1603
1604
1605 void TabWorkArea::paintEvent(QPaintEvent * event)
1606 {
1607         if (tabBar()->isVisible()) {
1608                 QTabWidget::paintEvent(event);
1609         } else {
1610                 // Prevent the selected tab to influence the
1611                 // painting of the frame of the tab widget.
1612                 // This is needed for gtk style in Qt.
1613                 QStylePainter p(this);
1614 #if QT_VERSION < 0x050000
1615                 QStyleOptionTabWidgetFrameV2 opt;
1616 #else
1617                 QStyleOptionTabWidgetFrame opt;
1618 #endif
1619                 initStyleOption(&opt);
1620                 opt.rect = style()->subElementRect(QStyle::SE_TabWidgetTabPane,
1621                         &opt, this);
1622                 opt.selectedTabRect = QRect();
1623                 p.drawPrimitive(QStyle::PE_FrameTabWidget, opt);
1624         }
1625 }
1626
1627
1628 bool TabWorkArea::posIsTab(QPoint position)
1629 {
1630         // tabAt returns -1 if tab does not covers position
1631         return tabBar()->tabAt(position) > -1;
1632 }
1633
1634
1635 void TabWorkArea::mouseDoubleClickEvent(QMouseEvent * event)
1636 {
1637         if (event->button() != Qt::LeftButton)
1638                 return;
1639
1640         // this code chunk is unnecessary because it seems the event only makes
1641         // it this far if it is not on a tab. I'm not sure why this is (maybe
1642         // it is handled and ended in DragTabBar?), and thus I'm not sure if
1643         // this is true in all cases and if it will be true in the future so I
1644         // leave this code for now. (skostysh, 2016-07-21)
1645         //
1646         // return early if double click on existing tabs
1647         if (posIsTab(event->pos()))
1648                 return;
1649
1650         dispatch(FuncRequest(LFUN_BUFFER_NEW));
1651 }
1652
1653
1654 void TabWorkArea::setFullScreen(bool full_screen)
1655 {
1656         for (int i = 0; i != count(); ++i) {
1657                 if (GuiWorkArea * wa = workArea(i))
1658                         wa->setFullScreen(full_screen);
1659         }
1660
1661         if (lyxrc.full_screen_tabbar)
1662                 showBar(!full_screen && count() > 1);
1663         else
1664                 showBar(count() > 1);
1665 }
1666
1667
1668 void TabWorkArea::showBar(bool show)
1669 {
1670         tabBar()->setEnabled(show);
1671         tabBar()->setVisible(show);
1672         closeBufferButton->setVisible(show && lyxrc.single_close_tab_button);
1673         setTabsClosable(!lyxrc.single_close_tab_button);
1674 }
1675
1676
1677 GuiWorkAreaContainer * TabWorkArea::widget(int index) const
1678 {
1679         QWidget * w = QTabWidget::widget(index);
1680         if (!w)
1681                 return nullptr;
1682         GuiWorkAreaContainer * wac = dynamic_cast<GuiWorkAreaContainer *>(w);
1683         LATTEST(wac);
1684         return wac;
1685 }
1686
1687
1688 GuiWorkAreaContainer * TabWorkArea::currentWidget() const
1689 {
1690         return widget(currentIndex());
1691 }
1692
1693
1694 GuiWorkArea * TabWorkArea::workArea(int index) const
1695 {
1696         GuiWorkAreaContainer * w = widget(index);
1697         if (!w)
1698                 return nullptr;
1699         return w->workArea();
1700 }
1701
1702
1703 GuiWorkArea * TabWorkArea::currentWorkArea() const
1704 {
1705         return workArea(currentIndex());
1706 }
1707
1708
1709 GuiWorkArea * TabWorkArea::workArea(Buffer & buffer) const
1710 {
1711         // FIXME: this method doesn't work if we have more than one work area
1712         // showing the same buffer.
1713         for (int i = 0; i != count(); ++i) {
1714                 GuiWorkArea * wa = workArea(i);
1715                 LASSERT(wa, return 0);
1716                 if (&wa->bufferView().buffer() == &buffer)
1717                         return wa;
1718         }
1719         return 0;
1720 }
1721
1722
1723 void TabWorkArea::closeAll()
1724 {
1725         while (count()) {
1726                 QWidget * wac = widget(0);
1727                 LASSERT(wac, return);
1728                 removeTab(0);
1729                 delete wac;
1730         }
1731 }
1732
1733
1734 int TabWorkArea::indexOfWorkArea(GuiWorkArea * w) const
1735 {
1736         for (int index = 0; index < count(); ++index)
1737                 if (workArea(index) == w)
1738                         return index;
1739         return -1;
1740 }
1741
1742
1743 bool TabWorkArea::setCurrentWorkArea(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         if (index == currentIndex())
1751                 // Make sure the work area is up to date.
1752                 on_currentTabChanged(index);
1753         else
1754                 // Switch to the work area.
1755                 setCurrentIndex(index);
1756         work_area->setFocus();
1757
1758         return true;
1759 }
1760
1761
1762 GuiWorkArea * TabWorkArea::addWorkArea(Buffer & buffer, GuiView & view)
1763 {
1764         GuiWorkArea * wa = new GuiWorkArea(buffer, view);
1765         GuiWorkAreaContainer * wac = new GuiWorkAreaContainer(wa);
1766         wa->setUpdatesEnabled(false);
1767         // Hide tabbar if there's no tab (avoid a resize and a flashing tabbar
1768         // when hiding it again below).
1769         if (!(currentWorkArea() && currentWorkArea()->isFullScreen()))
1770                 showBar(count() > 0);
1771         addTab(wac, wa->windowTitle());
1772         QObject::connect(wa, SIGNAL(titleChanged(GuiWorkArea *)),
1773                 this, SLOT(updateTabTexts()));
1774         if (currentWorkArea() && currentWorkArea()->isFullScreen())
1775                 setFullScreen(true);
1776         else
1777                 // Hide tabbar if there's only one tab.
1778                 showBar(count() > 1);
1779
1780         updateTabTexts();
1781
1782         return wa;
1783 }
1784
1785
1786 bool TabWorkArea::removeWorkArea(GuiWorkArea * work_area)
1787 {
1788         LASSERT(work_area, return false);
1789         int index = indexOfWorkArea(work_area);
1790         if (index == -1)
1791                 return false;
1792
1793         work_area->setUpdatesEnabled(false);
1794         QWidget * wac = widget(index);
1795         removeTab(index);
1796         delete wac;
1797
1798         if (count()) {
1799                 // make sure the next work area is enabled.
1800                 currentWidget()->setUpdatesEnabled(true);
1801                 if (currentWorkArea() && currentWorkArea()->isFullScreen())
1802                         setFullScreen(true);
1803                 else
1804                         // Show tabbar only if there's more than one tab.
1805                         showBar(count() > 1);
1806         } else
1807                 lastWorkAreaRemoved();
1808
1809         updateTabTexts();
1810
1811         return true;
1812 }
1813
1814
1815 void TabWorkArea::on_currentTabChanged(int i)
1816 {
1817         // returns e.g. on application destruction
1818         if (i == -1)
1819                 return;
1820         GuiWorkArea * wa = workArea(i);
1821         LASSERT(wa, return);
1822         wa->setUpdatesEnabled(true);
1823         wa->redraw(true);
1824         wa->setFocus();
1825         ///
1826         currentWorkAreaChanged(wa);
1827
1828         LYXERR(Debug::GUI, "currentTabChanged " << i
1829                 << " File: " << wa->bufferView().buffer().absFileName());
1830 }
1831
1832
1833 void TabWorkArea::closeCurrentBuffer()
1834 {
1835         GuiWorkArea * wa;
1836         if (clicked_tab_ == -1)
1837                 wa = currentWorkArea();
1838         else {
1839                 wa = workArea(clicked_tab_);
1840                 LASSERT(wa, return);
1841         }
1842         wa->view().closeWorkArea(wa);
1843 }
1844
1845
1846 void TabWorkArea::hideCurrentTab()
1847 {
1848         GuiWorkArea * wa;
1849         if (clicked_tab_ == -1)
1850                 wa = currentWorkArea();
1851         else {
1852                 wa = workArea(clicked_tab_);
1853                 LASSERT(wa, return);
1854         }
1855         wa->view().hideWorkArea(wa);
1856 }
1857
1858
1859 void TabWorkArea::closeTab(int index)
1860 {
1861         on_currentTabChanged(index);
1862         GuiWorkArea * wa;
1863         if (index == -1)
1864                 wa = currentWorkArea();
1865         else {
1866                 wa = workArea(index);
1867                 LASSERT(wa, return);
1868         }
1869         wa->view().closeWorkArea(wa);
1870 }
1871
1872
1873 ///
1874 class DisplayPath {
1875 public:
1876         /// make vector happy
1877         DisplayPath() : tab_(-1), dottedPrefix_(false) {}
1878         ///
1879         DisplayPath(int tab, FileName const & filename)
1880                 : tab_(tab)
1881         {
1882                 filename_ = (filename.extension() == "lyx") ?
1883                         toqstr(filename.onlyFileNameWithoutExt())
1884                         : toqstr(filename.onlyFileName());
1885                 postfix_ = toqstr(filename.absoluteFilePath()).
1886                         split("/", QString::SkipEmptyParts);
1887                 postfix_.pop_back();
1888                 abs_ = toqstr(filename.absoluteFilePath());
1889                 dottedPrefix_ = false;
1890         }
1891
1892         /// Absolute path for debugging.
1893         QString abs() const
1894         {
1895                 return abs_;
1896         }
1897         /// Add the first segment from the postfix or three dots to the prefix.
1898         /// Merge multiple dot tripples. In fact dots are added lazily, i.e. only
1899         /// when really needed.
1900         void shiftPathSegment(bool dotted)
1901         {
1902                 if (postfix_.count() <= 0)
1903                         return;
1904
1905                 if (!dotted) {
1906                         if (dottedPrefix_ && !prefix_.isEmpty())
1907                                 prefix_ += ellipsisSlash_;
1908                         prefix_ += postfix_.front() + "/";
1909                 }
1910                 dottedPrefix_ = dotted && !prefix_.isEmpty();
1911                 postfix_.pop_front();
1912         }
1913         ///
1914         QString displayString() const
1915         {
1916                 if (prefix_.isEmpty())
1917                         return filename_;
1918
1919                 bool dots = dottedPrefix_ || !postfix_.isEmpty();
1920                 return prefix_ + (dots ? ellipsisSlash_ : "") + filename_;
1921         }
1922         ///
1923         QString forecastPathString() const
1924         {
1925                 if (postfix_.count() == 0)
1926                         return displayString();
1927
1928                 return prefix_
1929                         + (dottedPrefix_ ? ellipsisSlash_ : "")
1930                         + postfix_.front() + "/";
1931         }
1932         ///
1933         bool final() const { return postfix_.empty(); }
1934         ///
1935         int tab() const { return tab_; }
1936
1937 private:
1938         /// ".../"
1939         static QString const ellipsisSlash_;
1940         ///
1941         QString prefix_;
1942         ///
1943         QStringList postfix_;
1944         ///
1945         QString filename_;
1946         ///
1947         QString abs_;
1948         ///
1949         int tab_;
1950         ///
1951         bool dottedPrefix_;
1952 };
1953
1954
1955 QString const DisplayPath::ellipsisSlash_ = QString(QChar(0x2026)) + "/";
1956
1957
1958 ///
1959 bool operator<(DisplayPath const & a, DisplayPath const & b)
1960 {
1961         return a.displayString() < b.displayString();
1962 }
1963
1964 ///
1965 bool operator==(DisplayPath const & a, DisplayPath const & b)
1966 {
1967         return a.displayString() == b.displayString();
1968 }
1969
1970
1971 void TabWorkArea::updateTabTexts()
1972 {
1973         size_t n = count();
1974         if (n == 0)
1975                 return;
1976         std::list<DisplayPath> paths;
1977         typedef std::list<DisplayPath>::iterator It;
1978
1979         // collect full names first: path into postfix, empty prefix and
1980         // filename without extension
1981         for (size_t i = 0; i < n; ++i) {
1982                 GuiWorkArea * i_wa = workArea(i);
1983                 FileName const fn = i_wa->bufferView().buffer().fileName();
1984                 paths.push_back(DisplayPath(i, fn));
1985         }
1986
1987         // go through path segments and see if it helps to make the path more unique
1988         bool somethingChanged = true;
1989         bool allFinal = false;
1990         while (somethingChanged && !allFinal) {
1991                 // adding path segments changes order
1992                 paths.sort();
1993
1994                 LYXERR(Debug::GUI, "updateTabTexts() iteration start");
1995                 somethingChanged = false;
1996                 allFinal = true;
1997
1998                 // find segments which are not unique (i.e. non-atomic)
1999                 It it = paths.begin();
2000                 It segStart = it;
2001                 QString segString = it->displayString();
2002                 for (; it != paths.end(); ++it) {
2003                         // look to the next item
2004                         It next = it;
2005                         ++next;
2006
2007                         // final?
2008                         allFinal = allFinal && it->final();
2009
2010                         LYXERR(Debug::GUI, "it = " << it->abs()
2011                                << " => " << it->displayString());
2012
2013                         // still the same segment?
2014                         QString nextString;
2015                         if ((next != paths.end()
2016                              && (nextString = next->displayString()) == segString))
2017                                 continue;
2018                         LYXERR(Debug::GUI, "segment ended");
2019
2020                         // only a trivial one with one element?
2021                         if (it == segStart) {
2022                                 // start new segment
2023                                 segStart = next;
2024                                 segString = nextString;
2025                                 continue;
2026                         }
2027
2028                         // We found a non-atomic segment
2029                         // We know that segStart <= it < next <= paths.end().
2030                         // The assertion below tells coverity about it.
2031                         LATTEST(segStart != paths.end());
2032                         QString dspString = segStart->forecastPathString();
2033                         LYXERR(Debug::GUI, "first forecast found for "
2034                                << segStart->abs() << " => " << dspString);
2035                         It sit = segStart;
2036                         ++sit;
2037                         // Shift path segments and hope for the best
2038                         // that it makes the path more unique.
2039                         somethingChanged = true;
2040                         bool moreUnique = false;
2041                         for (; sit != next; ++sit) {
2042                                 if (sit->forecastPathString() != dspString) {
2043                                         LYXERR(Debug::GUI, "different forecast found for "
2044                                                 << sit->abs() << " => " << sit->forecastPathString());
2045                                         moreUnique = true;
2046                                         break;
2047                                 }
2048                                 LYXERR(Debug::GUI, "same forecast found for "
2049                                         << sit->abs() << " => " << dspString);
2050                         }
2051
2052                         // if the path segment helped, add it. Otherwise add dots
2053                         bool dots = !moreUnique;
2054                         LYXERR(Debug::GUI, "using dots = " << dots);
2055                         for (sit = segStart; sit != next; ++sit) {
2056                                 sit->shiftPathSegment(dots);
2057                                 LYXERR(Debug::GUI, "shifting "
2058                                         << sit->abs() << " => " << sit->displayString());
2059                         }
2060
2061                         // start new segment
2062                         segStart = next;
2063                         segString = nextString;
2064                 }
2065         }
2066
2067         // set new tab titles
2068         for (It it = paths.begin(); it != paths.end(); ++it) {
2069                 int const tab_index = it->tab();
2070                 Buffer const & buf = workArea(tab_index)->bufferView().buffer();
2071                 QString tab_text = it->displayString().replace("&", "&&");
2072                 if (!buf.fileName().empty() && !buf.isClean())
2073                         tab_text += "*";
2074                 QString tab_tooltip = it->abs();
2075                 if (buf.hasReadonlyFlag()) {
2076                         setTabIcon(tab_index, QIcon(getPixmap("images/", "emblem-readonly", "svgz,png")));
2077                         tab_tooltip = qt_("%1 (read only)").arg(tab_tooltip);
2078                 } else
2079                         setTabIcon(tab_index, QIcon());
2080                 if (buf.notifiesExternalModification()) {
2081                         QString const warn = qt_("%1 (modified externally)");
2082                         tab_tooltip = warn.arg(tab_tooltip);
2083                         tab_text += QChar(0x26a0);
2084                 }
2085                 setTabText(tab_index, tab_text);
2086                 setTabToolTip(tab_index, tab_tooltip);
2087         }
2088 }
2089
2090
2091 void TabWorkArea::showContextMenu(const QPoint & pos)
2092 {
2093         // which tab?
2094         clicked_tab_ = static_cast<DragTabBar *>(tabBar())->tabAt(pos);
2095         if (clicked_tab_ == -1)
2096                 return;
2097
2098         // show tab popup
2099         QMenu popup;
2100         popup.addAction(QIcon(getPixmap("images/", "hidetab", "svgz,png")),
2101                 qt_("Hide tab"), this, SLOT(hideCurrentTab()));
2102         popup.addAction(QIcon(getPixmap("images/", "closetab", "svgz,png")),
2103                 qt_("Close tab"), this, SLOT(closeCurrentBuffer()));
2104         popup.exec(tabBar()->mapToGlobal(pos));
2105
2106         clicked_tab_ = -1;
2107 }
2108
2109
2110 void TabWorkArea::moveTab(int fromIndex, int toIndex)
2111 {
2112         QWidget * w = widget(fromIndex);
2113         QIcon icon = tabIcon(fromIndex);
2114         QString text = tabText(fromIndex);
2115
2116         setCurrentIndex(fromIndex);
2117         removeTab(fromIndex);
2118         insertTab(toIndex, w, icon, text);
2119         setCurrentIndex(toIndex);
2120 }
2121
2122
2123 DragTabBar::DragTabBar(QWidget* parent)
2124         : QTabBar(parent)
2125 {
2126         setAcceptDrops(true);
2127         setTabsClosable(!lyxrc.single_close_tab_button);
2128 }
2129
2130
2131 void DragTabBar::mousePressEvent(QMouseEvent * event)
2132 {
2133         if (event->button() == Qt::LeftButton)
2134                 dragStartPos_ = event->pos();
2135         QTabBar::mousePressEvent(event);
2136 }
2137
2138
2139 void DragTabBar::mouseMoveEvent(QMouseEvent * event)
2140 {
2141         // If the left button isn't pressed anymore then return
2142         if (!(event->buttons() & Qt::LeftButton))
2143                 return;
2144
2145         // If the distance is too small then return
2146         if ((event->pos() - dragStartPos_).manhattanLength()
2147             < QApplication::startDragDistance())
2148                 return;
2149
2150         // did we hit something after all?
2151         int tab = tabAt(dragStartPos_);
2152         if (tab == -1)
2153                 return;
2154
2155         // simulate button release to remove highlight from button
2156         int i = currentIndex();
2157         QMouseEvent me(QEvent::MouseButtonRelease, dragStartPos_,
2158                 event->button(), event->buttons(), 0);
2159         QTabBar::mouseReleaseEvent(&me);
2160         setCurrentIndex(i);
2161
2162         // initiate Drag
2163         QDrag * drag = new QDrag(this);
2164         QMimeData * mimeData = new QMimeData;
2165         // a crude way to distinguish tab-reodering drops from other ones
2166         mimeData->setData("action", "tab-reordering") ;
2167         drag->setMimeData(mimeData);
2168
2169         // get tab pixmap as cursor
2170         QRect r = tabRect(tab);
2171         QPixmap pixmap(r.size());
2172         render(&pixmap, - r.topLeft());
2173         drag->setPixmap(pixmap);
2174         drag->exec();
2175 }
2176
2177
2178 void DragTabBar::dragEnterEvent(QDragEnterEvent * event)
2179 {
2180         // Only accept if it's an tab-reordering request
2181         QMimeData const * m = event->mimeData();
2182         QStringList formats = m->formats();
2183         if (formats.contains("action")
2184             && m->data("action") == "tab-reordering")
2185                 event->acceptProposedAction();
2186 }
2187
2188
2189 void DragTabBar::dropEvent(QDropEvent * event)
2190 {
2191         int fromIndex = tabAt(dragStartPos_);
2192         int toIndex = tabAt(event->pos());
2193
2194         // Tell interested objects that
2195         if (fromIndex != toIndex)
2196                 tabMoveRequested(fromIndex, toIndex);
2197         event->acceptProposedAction();
2198 }
2199
2200
2201 GuiWorkAreaContainer::GuiWorkAreaContainer(GuiWorkArea * wa, QWidget * parent)
2202         : QWidget(parent), wa_(wa)
2203 {
2204         LASSERT(wa, return);
2205         Ui::WorkAreaUi::setupUi(this);
2206         layout()->addWidget(wa);
2207         connect(wa, SIGNAL(titleChanged(GuiWorkArea *)),
2208                 this, SLOT(updateDisplay()));
2209         connect(reloadPB, SIGNAL(clicked()), this, SLOT(reload()));
2210         connect(ignorePB, SIGNAL(clicked()), this, SLOT(ignore()));
2211         setMessageColour({notificationFrame}, {reloadPB, ignorePB});
2212         updateDisplay();
2213 }
2214
2215
2216 void GuiWorkAreaContainer::updateDisplay()
2217 {
2218         Buffer const & buf = wa_->bufferView().buffer();
2219         notificationFrame->setHidden(!buf.notifiesExternalModification());
2220         QString const label = qt_("<b>The file %1 changed on disk.</b>")
2221                 .arg(toqstr(buf.fileName().displayName()));
2222         externalModificationLabel->setText(label);
2223 }
2224
2225
2226 void GuiWorkAreaContainer::dispatch(FuncRequest f) const
2227 {
2228         lyx::dispatch(FuncRequest(LFUN_BUFFER_SWITCH,
2229                                   wa_->bufferView().buffer().absFileName()));
2230         lyx::dispatch(f);
2231 }
2232
2233
2234 void GuiWorkAreaContainer::reload() const
2235 {
2236         dispatch(FuncRequest(LFUN_BUFFER_RELOAD));
2237 }
2238
2239
2240 void GuiWorkAreaContainer::ignore() const
2241 {
2242         dispatch(FuncRequest(LFUN_BUFFER_EXTERNAL_MODIFICATION_CLEAR));
2243 }
2244
2245
2246 void GuiWorkAreaContainer::mouseDoubleClickEvent(QMouseEvent * event)
2247 {
2248         // prevent TabWorkArea from opening a new buffer on double click
2249         event->accept();
2250 }
2251
2252
2253 } // namespace frontend
2254 } // namespace lyx
2255
2256 #include "moc_GuiWorkArea.cpp"