src/frontends/qt4/GuiWorkArea.cpp

   1 /**
   2  * \file GuiWorkArea.cpp
   3  * This file is part of LyX, the document processor.
   4  * Licence details can be found in the file COPYING.
   5  *
   6  * \author John Levon
   7  * \author Abdelrazak Younes
   8  *
   9  * Full author contact details are available in file CREDITS.
  10  */
  11
  12 #include <config.h>
  13
  14 #include "GuiWorkArea.h"
  15 #include "GuiWorkArea_Private.h"
  16
  17 #include "ColorCache.h"
  18 #include "FontLoader.h"
  19 #include "GuiApplication.h"
  20 #include "GuiCompleter.h"
  21 #include "GuiKeySymbol.h"
  22 #include "GuiPainter.h"
  23 #include "GuiView.h"
  24 #include "Menus.h"
  25 #include "qt_helpers.h"
  26
  27 #include "Buffer.h"
  28 #include "BufferList.h"
  29 #include "BufferParams.h"
  30 #include "BufferView.h"
  31 #include "CoordCache.h"
  32 #include "Cursor.h"
  33 #include "Font.h"
  34 #include "FuncRequest.h"
  35 #include "KeySymbol.h"
  36 #include "Language.h"
  37 #include "LyX.h"
  38 #include "LyXRC.h"
  39 #include "LyXVC.h"
  40 #include "Text.h"
  41 #include "TextMetrics.h"
  42 #include "Undo.h"
  43 #include "version.h"
  44
  45 #include "graphics/GraphicsImage.h"
  46 #include "graphics/GraphicsLoader.h"
  47
  48 #include "support/convert.h"
  49 #include "support/debug.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 <QScrollBar>
  72 #include <QStyleOption>
  73 #include <QStylePainter>
  74 #include <QTimer>
  75 #include <QToolButton>
  76 #include <QToolTip>
  77 #include <QMenuBar>
  78
  79 #include <cmath>
  80 #include <iostream>
  81
  82 int const TabIndicatorWidth = 3;
  83
  84 #undef KeyPress
  85 #undef NoModifier
  86
  87 using namespace std;
  88 using namespace lyx::support;
  89
  90 namespace lyx {
  91
  92
  93 /// return the LyX mouse button state from Qt's
  94 static mouse_button::state q_button_state(Qt::MouseButton button)
  95 {
  96         mouse_button::state b = mouse_button::none;
  97         switch (button) {
  98                 case Qt::LeftButton:
  99                         b = mouse_button::button1;
 100                         break;
 101                 case Qt::MidButton:
 102                         b = mouse_button::button2;
 103                         break;
 104                 case Qt::RightButton:
 105                         b = mouse_button::button3;
 106                         break;
 107                 default:
 108                         break;
 109         }
 110         return b;
 111 }
 112
 113
 114 /// return the LyX mouse button state from Qt's
 115 mouse_button::state q_motion_state(Qt::MouseButtons state)
 116 {
 117         mouse_button::state b = mouse_button::none;
 118         if (state & Qt::LeftButton)
 119                 b |= mouse_button::button1;
 120         if (state & Qt::MidButton)
 121                 b |= mouse_button::button2;
 122         if (state & Qt::RightButton)
 123                 b |= mouse_button::button3;
 124         return b;
 125 }
 126
 127
 128 namespace frontend {
 129
 130 class CaretWidget {
 131 public:
 132         CaretWidget() : rtl_(false), l_shape_(false), completable_(false),
 133                 x_(0), caret_width_(0)
 134         {}
 135
 136         void draw(QPainter & painter)
 137         {
 138                 if (!rect_.isValid())
 139                         return;
 140
 141                 int y = rect_.top();
 142                 int l = x_ - rect_.left();
 143                 int r = rect_.right() - x_;
 144                 int bot = rect_.bottom();
 145
 146                 // draw vertical line
 147                 painter.fillRect(x_, y, caret_width_, rect_.height(), color_);
 148
 149                 // draw RTL/LTR indication
 150                 painter.setPen(color_);
 151                 if (l_shape_) {
 152                         if (rtl_)
 153                                 painter.drawLine(x_, bot, x_ - l, bot);
 154                         else
 155                                 painter.drawLine(x_, bot, x_ + caret_width_ + r, bot);
 156                 }
 157
 158                 // draw completion triangle
 159                 if (completable_) {
 160                         int m = y + rect_.height() / 2;
 161                         int d = TabIndicatorWidth - 1;
 162                         if (rtl_) {
 163                                 painter.drawLine(x_ - 1, m - d, x_ - 1 - d, m);
 164                                 painter.drawLine(x_ - 1, m + d, x_ - 1 - d, m);
 165                         } else {
 166                                 painter.drawLine(x_ + caret_width_, m - d, x_ + caret_width_ + d, m);
 167                                 painter.drawLine(x_ + caret_width_, m + d, x_ + caret_width_ + d, m);
 168                         }
 169                 }
 170         }
 171
 172         void update(int x, int y, int h, bool l_shape,
 173                 bool rtl, bool completable)
 174         {
 175                 color_ = guiApp->colorCache().get(Color_cursor);
 176                 l_shape_ = l_shape;
 177                 rtl_ = rtl;
 178                 completable_ = completable;
 179                 x_ = x;
 180
 181                 // extension to left and right
 182                 int l = 0;
 183                 int r = 0;
 184
 185                 // RTL/LTR indication
 186                 if (l_shape_) {
 187                         if (rtl)
 188                                 l += h / 3;
 189                         else
 190                                 r += h / 3;
 191                 }
 192
 193                 // completion triangle
 194                 if (completable_) {
 195                         if (rtl)
 196                                 l = max(l, TabIndicatorWidth);
 197                         else
 198                                 r = max(r, TabIndicatorWidth);
 199                 }
 200
 201                 //FIXME: LyXRC::cursor_width should be caret_width
 202                 caret_width_ = lyxrc.cursor_width
 203                         ? lyxrc.cursor_width
 204                         : 1 + int((lyxrc.currentZoom + 50) / 200.0);
 205
 206                 // compute overall rectangle
 207                 rect_ = QRect(x - l, y, caret_width_ + r + l, h);
 208         }
 209
 210         QRect const & rect() { return rect_; }
 211
 212 private:
 213         /// caret is in RTL or LTR text
 214         bool rtl_;
 215         /// indication for RTL or LTR
 216         bool l_shape_;
 217         /// triangle to show that a completion is available
 218         bool completable_;
 219         ///
 220         QColor color_;
 221         /// rectangle, possibly with l_shape and completion triangle
 222         QRect rect_;
 223         /// x position (were the vertical line is drawn)
 224         int x_;
 225         /// the width of the vertical blinking bar
 226         int caret_width_;
 227 };
 228
 229
 230 // This is a 'heartbeat' generating synthetic mouse move events when the
 231 // cursor is at the top or bottom edge of the viewport. One scroll per 0.2 s
 232 SyntheticMouseEvent::SyntheticMouseEvent()
 233         : timeout(200), restart_timeout(true)
 234 {}
 235
 236
 237 GuiWorkArea::Private::Private(GuiWorkArea * parent)
 238 : p(parent), buffer_view_(0), lyx_view_(0),
 239   caret_(0), caret_visible_(false),
 240   need_resize_(false), schedule_redraw_(false), preedit_lines_(1),
 241   pixel_ratio_(1.0),
 242   completer_(new GuiCompleter(p, p)), dialog_mode_(false), shell_escape_(false),
 243   read_only_(false), clean_(true), externally_modified_(false)
 244 {
 245         int const time = QApplication::cursorFlashTime() / 2;
 246         if (time > 0) {
 247                 caret_timeout_.setInterval(time);
 248                 caret_timeout_.start();
 249         } else {
 250                 // let's initialize this just to be safe
 251                 caret_timeout_.setInterval(500);
 252         }
 253 }
 254
 255
 256 GuiWorkArea::Private::~Private()
 257 {
 258         // If something is wrong with the buffer, we can ignore it safely
 259         try {
 260                 buffer_view_->buffer().workAreaManager().remove(p);
 261         } catch(...) {}
 262         delete buffer_view_;
 263         delete caret_;
 264         // Completer has a QObject parent and is thus automatically destroyed.
 265         // See #4758.
 266         // delete completer_;
 267 }
 268
 269
 270 GuiWorkArea::GuiWorkArea(QWidget * /* w */)
 271 : d(new Private(this))
 272 {
 273         new CompressorProxy(this); // not a leak
 274 }
 275
 276
 277 GuiWorkArea::GuiWorkArea(Buffer & buffer, GuiView & gv)
 278 : d(new Private(this))
 279 {
 280         new CompressorProxy(this); // not a leak
 281         setGuiView(gv);
 282         buffer.params().display_pixel_ratio = theGuiApp()->pixelRatio();
 283         setBuffer(buffer);
 284         init();
 285 }
 286
 287
 288 double GuiWorkArea::pixelRatio() const
 289 {
 290 #if QT_VERSION >= 0x050000
 291         return qt_scale_factor * devicePixelRatio();
 292 #else
 293         return 1.0;
 294 #endif
 295 }
 296
 297
 298 void GuiWorkArea::init()
 299 {
 300         // Setup the signals
 301         connect(&d->caret_timeout_, SIGNAL(timeout()),
 302                 this, SLOT(toggleCaret()));
 303
 304         // This connection is closed at the same time as this is destroyed.
 305         d->synthetic_mouse_event_.timeout.timeout.connect([this](){
 306                         generateSyntheticMouseEvent();
 307                 });
 308
 309         // With Qt4.5 a mouse event will happen before the first paint event
 310         // so make sure that the buffer view has an up to date metrics.
 311         d->buffer_view_->resize(viewport()->width(), viewport()->height());
 312         d->caret_ = new frontend::CaretWidget();
 313
 314         setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 315         setAcceptDrops(true);
 316         setMouseTracking(true);
 317         setMinimumSize(100, 70);
 318         setFrameStyle(QFrame::NoFrame);
 319         updateWindowTitle();
 320
 321         d->updateCursorShape();
 322
 323         // we paint our own background
 324         viewport()->setAttribute(Qt::WA_OpaquePaintEvent);
 325
 326         setFocusPolicy(Qt::StrongFocus);
 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
 336
 337 GuiWorkArea::~GuiWorkArea()
 338 {
 339         delete d;
 340 }
 341
 342
 343 void GuiWorkArea::Private::updateCursorShape()
 344 {
 345         bool const clickable = buffer_view_ && buffer_view_->clickableInset();
 346         p->viewport()->setCursor(clickable ? Qt::PointingHandCursor
 347                                            : Qt::IBeamCursor);
 348 }
 349
 350
 351 void GuiWorkArea::setGuiView(GuiView & gv)
 352 {
 353         d->lyx_view_ = &gv;
 354 }
 355
 356
 357 void GuiWorkArea::setBuffer(Buffer & buffer)
 358 {
 359         delete d->buffer_view_;
 360         d->buffer_view_ = new BufferView(buffer);
 361         buffer.workAreaManager().add(this);
 362
 363         // HACK: Prevents an additional redraw when the scrollbar pops up
 364         // which regularily happens on documents with more than one page.
 365         // The policy  should be set to "Qt::ScrollBarAsNeeded" soon.
 366         // Since we have no geometry information yet, we assume that
 367         // a document needs a scrollbar if there is more then four
 368         // paragraph in the outermost text.
 369         if (buffer.text().paragraphs().size() > 4)
 370                 setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
 371         QTimer::singleShot(50, this, SLOT(fixVerticalScrollBar()));
 372         Q_EMIT bufferViewChanged();
 373 }
 374
 375
 376 void GuiWorkArea::fixVerticalScrollBar()
 377 {
 378         if (!isFullScreen())
 379                 setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
 380 }
 381
 382
 383 void GuiWorkArea::close()
 384 {
 385         d->lyx_view_->removeWorkArea(this);
 386 }
 387
 388
 389 void GuiWorkArea::setFullScreen(bool full_screen)
 390 {
 391         d->buffer_view_->setFullScreen(full_screen);
 392         setFrameStyle(QFrame::NoFrame);
 393         if (full_screen) {
 394                 setFrameStyle(QFrame::NoFrame);
 395                 if (lyxrc.full_screen_scrollbar)
 396                         setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 397         } else
 398                 setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
 399 }
 400
 401
 402 BufferView & GuiWorkArea::bufferView()
 403 {
 404         return *d->buffer_view_;
 405 }
 406
 407
 408 BufferView const & GuiWorkArea::bufferView() const
 409 {
 410         return *d->buffer_view_;
 411 }
 412
 413
 414 void GuiWorkArea::stopBlinkingCaret()
 415 {
 416         d->caret_timeout_.stop();
 417         d->hideCaret();
 418 }
 419
 420
 421 void GuiWorkArea::startBlinkingCaret()
 422 {
 423         // do not show the cursor if the view is busy
 424         if (view().busy())
 425                 return;
 426
 427         Point p;
 428         int h = 0;
 429         d->buffer_view_->caretPosAndHeight(p, h);
 430         // Don't start blinking if the cursor isn't on screen.
 431         if (!d->buffer_view_->cursorInView(p, h))
 432                 return;
 433
 434         d->showCaret();
 435
 436         //we're not supposed to cache this value.
 437         int const time = QApplication::cursorFlashTime() / 2;
 438         if (time <= 0)
 439                 return;
 440         d->caret_timeout_.setInterval(time);
 441         d->caret_timeout_.start();
 442 }
 443
 444
 445 void GuiWorkArea::toggleCaret()
 446 {
 447         if (d->caret_visible_)
 448                 d->hideCaret();
 449         else
 450                 d->showCaret();
 451 }
 452
 453
 454 void GuiWorkArea::redraw(bool update_metrics)
 455 {
 456         if (!isVisible())
 457                 // No need to redraw in this case.
 458                 return;
 459
 460         // No need to do anything if this is the current view. The BufferView
 461         // metrics are already up to date.
 462         if (update_metrics || d->lyx_view_ != guiApp->currentView()
 463                 || d->lyx_view_->currentWorkArea() != this) {
 464                 // FIXME: it would be nice to optimize for the off-screen case.
 465                 d->buffer_view_->cursor().fixIfBroken();
 466                 d->buffer_view_->updateMetrics();
 467                 d->buffer_view_->cursor().fixIfBroken();
 468         }
 469
 470         // update caret position, because otherwise it has to wait until
 471         // the blinking interval is over
 472         if (d->caret_visible_) {
 473                 d->hideCaret();
 474                 d->showCaret();
 475         }
 476
 477         LYXERR(Debug::WORKAREA, "WorkArea::redraw screen");
 478         viewport()->update();
 479
 480         /// \warning: scrollbar updating *must* be done after the BufferView is drawn
 481         /// because \c BufferView::updateScrollbar() is called in \c BufferView::draw().
 482         d->updateScrollbar();
 483         d->lyx_view_->updateStatusBar();
 484
 485         if (lyxerr.debugging(Debug::WORKAREA))
 486                 d->buffer_view_->coordCache().dump();
 487
 488         updateWindowTitle();
 489
 490         d->updateCursorShape();
 491 }
 492
 493
 494 // Keep in sync with GuiWorkArea::processKeySym below
 495 bool GuiWorkArea::queryKeySym(KeySymbol const & key, KeyModifier mod) const
 496 {
 497         return guiApp->queryKeySym(key, mod);
 498 }
 499
 500
 501 // Keep in sync with GuiWorkArea::queryKeySym above
 502 void GuiWorkArea::processKeySym(KeySymbol const & key, KeyModifier mod)
 503 {
 504         if (d->lyx_view_->isFullScreen() && d->lyx_view_->menuBar()->isVisible()
 505                 && lyxrc.full_screen_menubar) {
 506                 // FIXME HACK: we should not have to do this here. See related comment
 507                 // in GuiView::event() (QEvent::ShortcutOverride)
 508                 d->lyx_view_->menuBar()->hide();
 509         }
 510
 511         // In order to avoid bad surprise in the middle of an operation,
 512         // we better stop the blinking caret...
 513         // the caret gets restarted in GuiView::restartCaret()
 514         stopBlinkingCaret();
 515         guiApp->processKeySym(key, mod);
 516 }
 517
 518
 519 void GuiWorkArea::Private::dispatch(FuncRequest const & cmd)
 520 {
 521         // Handle drag&drop
 522         if (cmd.action() == LFUN_FILE_OPEN) {
 523                 DispatchResult dr;
 524                 lyx_view_->dispatch(cmd, dr);
 525                 return;
 526         }
 527
 528         bool const notJustMovingTheMouse =
 529                 cmd.action() != LFUN_MOUSE_MOTION || cmd.button() != mouse_button::none;
 530
 531         // In order to avoid bad surprise in the middle of an operation, we better stop
 532         // the blinking caret.
 533         if (notJustMovingTheMouse)
 534                 p->stopBlinkingCaret();
 535
 536         buffer_view_->mouseEventDispatch(cmd);
 537
 538         // Skip these when selecting
 539         // FIXME: let GuiView take care of those.
 540         if (cmd.action() != LFUN_MOUSE_MOTION) {
 541                 completer_->updateVisibility(false, false);
 542                 lyx_view_->updateDialogs();
 543                 lyx_view_->updateStatusBar();
 544         }
 545
 546         // GUI tweaks except with mouse motion with no button pressed.
 547         if (notJustMovingTheMouse) {
 548                 // Slight hack: this is only called currently when we
 549                 // clicked somewhere, so we force through the display
 550                 // of the new status here.
 551                 // FIXME: let GuiView take care of those.
 552                 lyx_view_->clearMessage();
 553
 554                 // Show the caret immediately after any operation
 555                 p->startBlinkingCaret();
 556         }
 557
 558         updateCursorShape();
 559 }
 560
 561
 562 void GuiWorkArea::Private::resizeBufferView()
 563 {
 564         // WARNING: Please don't put any code that will trigger a repaint here!
 565         // We are already inside a paint event.
 566         p->stopBlinkingCaret();
 567         // Warn our container (GuiView).
 568         p->busy(true);
 569
 570         Point point;
 571         int h = 0;
 572         buffer_view_->caretPosAndHeight(point, h);
 573         bool const caret_in_view = buffer_view_->cursorInView(point, h);
 574         buffer_view_->resize(p->viewport()->width(), p->viewport()->height());
 575         if (caret_in_view)
 576                 buffer_view_->scrollToCursor();
 577         p->viewport()->update();
 578
 579         // Update scrollbars which might have changed due different
 580         // BufferView dimension. This is especially important when the
 581         // BufferView goes from zero-size to the real-size for the first time,
 582         // as the scrollbar paramters are then set for the first time.
 583         updateScrollbar();
 584
 585         need_resize_ = false;
 586         p->busy(false);
 587         // Eventually, restart the caret after the resize event.
 588         // We might be resizing even if the focus is on another widget so we only
 589         // restart the caret if we have the focus.
 590         if (p->hasFocus())
 591                 QTimer::singleShot(50, p, SLOT(startBlinkingCaret()));
 592 }
 593
 594
 595 void GuiWorkArea::Private::showCaret()
 596 {
 597         if (caret_visible_)
 598                 return;
 599
 600         Point point;
 601         int h = 0;
 602         buffer_view_->caretPosAndHeight(point, h);
 603         if (!buffer_view_->cursorInView(point, h))
 604                 return;
 605
 606         // RTL or not RTL
 607         bool l_shape = false;
 608         Font const & realfont = buffer_view_->cursor().real_current_font;
 609         BufferParams const & bp = buffer_view_->buffer().params();
 610         bool const samelang = realfont.language() == bp.language;
 611         bool const isrtl = realfont.isVisibleRightToLeft();
 612
 613         if (!samelang || isrtl != bp.language->rightToLeft())
 614                 l_shape = true;
 615
 616         // The ERT language hack needs fixing up
 617         if (realfont.language() == latex_language)
 618                 l_shape = false;
 619
 620         // show caret on screen
 621         Cursor & cur = buffer_view_->cursor();
 622         bool completable = cur.inset().showCompletionCursor()
 623                 && completer_->completionAvailable()
 624                 && !completer_->popupVisible()
 625                 && !completer_->inlineVisible();
 626         caret_visible_ = true;
 627
 628         //int cur_x = buffer_view_->getPos(cur).x_;
 629         // We may have decided to slide the cursor row so that caret
 630         // is visible.
 631         point.x_ -= buffer_view_->horizScrollOffset();
 632
 633         caret_->update(point.x_, point.y_, h, l_shape, isrtl, completable);
 634
 635         if (schedule_redraw_) {
 636                 // This happens when a graphic conversion is finished. As we don't know
 637                 // the size of the new graphics, it's better the update everything.
 638                 // We can't use redraw() here because this would trigger a infinite
 639                 // recursive loop with showCaret().
 640                 buffer_view_->resize(p->viewport()->width(), p->viewport()->height());
 641                 p->viewport()->update();
 642                 updateScrollbar();
 643                 schedule_redraw_ = false;
 644                 return;
 645         }
 646
 647         p->viewport()->update(caret_->rect());
 648 }
 649
 650
 651 void GuiWorkArea::Private::hideCaret()
 652 {
 653         if (!caret_visible_)
 654                 return;
 655
 656         caret_visible_ = false;
 657         //if (!qApp->focusWidget())
 658                 p->viewport()->update(caret_->rect());
 659 }
 660
 661
 662 void GuiWorkArea::Private::updateScrollbar()
 663 {
 664         // Prevent setRange() and setSliderPosition from causing recursive calls via
 665         // the signal valueChanged. (#10311)
 666         QObject::disconnect(p->verticalScrollBar(), SIGNAL(valueChanged(int)),
 667                             p, SLOT(scrollTo(int)));
 668         ScrollbarParameters const & scroll_ = buffer_view_->scrollbarParameters();
 669         p->verticalScrollBar()->setRange(scroll_.min, scroll_.max);
 670         p->verticalScrollBar()->setPageStep(scroll_.page_step);
 671         p->verticalScrollBar()->setSingleStep(scroll_.single_step);
 672         p->verticalScrollBar()->setSliderPosition(0);
 673         // Connect to the vertical scroll bar
 674         QObject::connect(p->verticalScrollBar(), SIGNAL(valueChanged(int)),
 675                          p, SLOT(scrollTo(int)));
 676 }
 677
 678
 679 void GuiWorkArea::scrollTo(int value)
 680 {
 681         stopBlinkingCaret();
 682         d->buffer_view_->scrollDocView(value, true);
 683
 684         if (lyxrc.cursor_follows_scrollbar) {
 685                 d->buffer_view_->setCursorFromScrollbar();
 686                 // FIXME: let GuiView take care of those.
 687                 d->lyx_view_->updateLayoutList();
 688         }
 689         // Show the caret immediately after any operation.
 690         startBlinkingCaret();
 691         // FIXME QT5
 692 #ifdef Q_WS_X11
 693         QApplication::syncX();
 694 #endif
 695 }
 696
 697
 698 bool GuiWorkArea::event(QEvent * e)
 699 {
 700         switch (e->type()) {
 701         case QEvent::ToolTip: {
 702                 QHelpEvent * helpEvent = static_cast<QHelpEvent *>(e);
 703                 if (lyxrc.use_tooltip) {
 704                         QPoint pos = helpEvent->pos();
 705                         if (pos.x() < viewport()->width()) {
 706                                 QString s = toqstr(d->buffer_view_->toolTip(pos.x(), pos.y()));
 707                                 QToolTip::showText(helpEvent->globalPos(), formatToolTip(s,35));
 708                         }
 709                         else
 710                                 QToolTip::hideText();
 711                 }
 712                 // Don't forget to accept the event!
 713                 e->accept();
 714                 return true;
 715         }
 716
 717         case QEvent::ShortcutOverride:
 718                 // keyPressEvent is ShortcutOverride-aware and only accepts the event in
 719                 // this case
 720                 keyPressEvent(static_cast<QKeyEvent *>(e));
 721                 return e->isAccepted();
 722
 723         case QEvent::KeyPress: {
 724                 // We catch this event in order to catch the Tab or Shift+Tab key press
 725                 // which are otherwise reserved to focus switching between controls
 726                 // within a dialog.
 727                 QKeyEvent * ke = static_cast<QKeyEvent*>(e);
 728                 if ((ke->key() == Qt::Key_Tab && ke->modifiers() == Qt::NoModifier)
 729                         || (ke->key() == Qt::Key_Backtab && (
 730                                 ke->modifiers() == Qt::ShiftModifier
 731                                 || ke->modifiers() == Qt::NoModifier))) {
 732                         keyPressEvent(ke);
 733                         return true;
 734                 }
 735                 return QAbstractScrollArea::event(e);
 736         }
 737
 738         default:
 739                 return QAbstractScrollArea::event(e);
 740         }
 741         return false;
 742 }
 743
 744
 745 void GuiWorkArea::contextMenuEvent(QContextMenuEvent * e)
 746 {
 747         string name;
 748         if (e->reason() == QContextMenuEvent::Mouse)
 749                 // the menu name is set on mouse press
 750                 name = d->context_menu_name_;
 751         else {
 752                 QPoint pos = e->pos();
 753                 Cursor const & cur = d->buffer_view_->cursor();
 754                 if (e->reason() == QContextMenuEvent::Keyboard && cur.inTexted()) {
 755                         // Do not access the context menu of math right in front of before
 756                         // the cursor. This does not work when the cursor is in text.
 757                         Inset * inset = cur.paragraph().getInset(cur.pos());
 758                         if (inset && inset->asInsetMath())
 759                                 --pos.rx();
 760                         else if (cur.pos() > 0) {
 761                                 Inset * inset = cur.paragraph().getInset(cur.pos() - 1);
 762                                 if (inset)
 763                                         ++pos.rx();
 764                         }
 765                 }
 766                 name = d->buffer_view_->contextMenu(pos.x(), pos.y());
 767         }
 768
 769         if (name.empty()) {
 770                 e->accept();
 771                 return;
 772         }
 773         // always show mnemonics when the keyboard is used to show the context menu
 774         // FIXME: This should be fixed in Qt itself
 775         bool const keyboard = (e->reason() == QContextMenuEvent::Keyboard);
 776         QMenu * menu = guiApp->menus().menu(toqstr(name), *d->lyx_view_, keyboard);
 777         if (!menu) {
 778                 e->accept();
 779                 return;
 780         }
 781         // Position the menu to the right.
 782         // FIXME: menu position should be different for RTL text.
 783         menu->exec(e->globalPos());
 784         e->accept();
 785 }
 786
 787
 788 void GuiWorkArea::focusInEvent(QFocusEvent * e)
 789 {
 790         LYXERR(Debug::DEBUG, "GuiWorkArea::focusInEvent(): " << this << endl);
 791         if (d->lyx_view_->currentWorkArea() != this) {
 792                 d->lyx_view_->setCurrentWorkArea(this);
 793                 d->lyx_view_->currentWorkArea()->bufferView().buffer().updateBuffer();
 794         }
 795
 796         startBlinkingCaret();
 797         QAbstractScrollArea::focusInEvent(e);
 798 }
 799
 800
 801 void GuiWorkArea::focusOutEvent(QFocusEvent * e)
 802 {
 803         LYXERR(Debug::DEBUG, "GuiWorkArea::focusOutEvent(): " << this << endl);
 804         stopBlinkingCaret();
 805         QAbstractScrollArea::focusOutEvent(e);
 806 }
 807
 808
 809 void GuiWorkArea::mousePressEvent(QMouseEvent * e)
 810 {
 811         if (d->dc_event_.active && d->dc_event_ == *e) {
 812                 d->dc_event_.active = false;
 813                 FuncRequest cmd(LFUN_MOUSE_TRIPLE, e->x(), e->y(),
 814                         q_button_state(e->button()), q_key_state(e->modifiers()));
 815                 d->dispatch(cmd);
 816                 e->accept();
 817                 return;
 818         }
 819
 820 #if (QT_VERSION < 0x050000) && !defined(__HAIKU__)
 821         inputContext()->reset();
 822 #endif
 823
 824         FuncRequest const cmd(LFUN_MOUSE_PRESS, e->x(), e->y(),
 825                         q_button_state(e->button()), q_key_state(e->modifiers()));
 826         d->dispatch(cmd);
 827
 828         // Save the context menu on mouse press, because also the mouse
 829         // cursor is set on mouse press. Afterwards, we can either release
 830         // the mousebutton somewhere else, or the cursor might have moved
 831         // due to the DEPM. We need to do this after the mouse has been
 832         // set in dispatch(), because the selection state might change.
 833         if (e->button() == Qt::RightButton)
 834                 d->context_menu_name_ = d->buffer_view_->contextMenu(e->x(), e->y());
 835
 836         e->accept();
 837 }
 838
 839
 840 void GuiWorkArea::mouseReleaseEvent(QMouseEvent * e)
 841 {
 842         if (d->synthetic_mouse_event_.timeout.running())
 843                 d->synthetic_mouse_event_.timeout.stop();
 844
 845         FuncRequest const cmd(LFUN_MOUSE_RELEASE, e->x(), e->y(),
 846                         q_button_state(e->button()), q_key_state(e->modifiers()));
 847         d->dispatch(cmd);
 848         e->accept();
 849 }
 850
 851
 852 void GuiWorkArea::mouseMoveEvent(QMouseEvent * e)
 853 {
 854         // we kill the triple click if we move
 855         doubleClickTimeout();
 856         FuncRequest cmd(LFUN_MOUSE_MOTION, e->x(), e->y(),
 857                         q_motion_state(e->buttons()), q_key_state(e->modifiers()));
 858
 859         e->accept();
 860
 861         // If we're above or below the work area...
 862         if ((e->y() <= 20 || e->y() >= viewport()->height() - 20)
 863                         && e->buttons() == mouse_button::button1) {
 864                 // Make sure only a synthetic event can cause a page scroll,
 865                 // so they come at a steady rate:
 866                 if (e->y() <= 20)
 867                         // _Force_ a scroll up:
 868                         cmd.set_y(e->y() - 21);
 869                 else
 870                         cmd.set_y(e->y() + 21);
 871                 // Store the event, to be handled when the timeout expires.
 872                 d->synthetic_mouse_event_.cmd = cmd;
 873
 874                 if (d->synthetic_mouse_event_.timeout.running()) {
 875                         // Discard the event. Note that it _may_ be handled
 876                         // when the timeout expires if
 877                         // synthetic_mouse_event_.cmd has not been overwritten.
 878                         // Ie, when the timeout expires, we handle the
 879                         // most recent event but discard all others that
 880                         // occurred after the one used to start the timeout
 881                         // in the first place.
 882                         return;
 883                 }
 884
 885                 d->synthetic_mouse_event_.restart_timeout = true;
 886                 d->synthetic_mouse_event_.timeout.start();
 887                 // Fall through to handle this event...
 888
 889         } else if (d->synthetic_mouse_event_.timeout.running()) {
 890                 // Store the event, to be possibly handled when the timeout
 891                 // expires.
 892                 // Once the timeout has expired, normal control is returned
 893                 // to mouseMoveEvent (restart_timeout = false).
 894                 // This results in a much smoother 'feel' when moving the
 895                 // mouse back into the work area.
 896                 d->synthetic_mouse_event_.cmd = cmd;
 897                 d->synthetic_mouse_event_.restart_timeout = false;
 898                 return;
 899         }
 900         d->dispatch(cmd);
 901 }
 902
 903
 904 void GuiWorkArea::wheelEvent(QWheelEvent * ev)
 905 {
 906         // Wheel rotation by one notch results in a delta() of 120 (see
 907         // documentation of QWheelEvent)
 908         double const delta = ev->delta() / 120.0;
 909         bool zoom = false;
 910         switch (lyxrc.scroll_wheel_zoom) {
 911         case LyXRC::SCROLL_WHEEL_ZOOM_CTRL:
 912                 zoom = ev->modifiers() & Qt::ControlModifier;
 913                 zoom &= !(ev->modifiers() & (Qt::ShiftModifier | Qt::AltModifier));
 914                 break;
 915         case LyXRC::SCROLL_WHEEL_ZOOM_SHIFT:
 916                 zoom = ev->modifiers() & Qt::ShiftModifier;
 917                 zoom &= !(ev->modifiers() & (Qt::ControlModifier | Qt::AltModifier));
 918                 break;
 919         case LyXRC::SCROLL_WHEEL_ZOOM_ALT:
 920                 zoom = ev->modifiers() & Qt::AltModifier;
 921                 zoom &= !(ev->modifiers() & (Qt::ShiftModifier | Qt::ControlModifier));
 922                 break;
 923         case LyXRC::SCROLL_WHEEL_ZOOM_OFF:
 924                 break;
 925         }
 926         if (zoom) {
 927                 docstring arg = convert<docstring>(int(5 * delta));
 928                 lyx::dispatch(FuncRequest(LFUN_BUFFER_ZOOM_IN, arg));
 929                 return;
 930         }
 931
 932         // Take into account the desktop wide settings.
 933         int const lines = qApp->wheelScrollLines();
 934         int const page_step = verticalScrollBar()->pageStep();
 935         // Test if the wheel mouse is set to one screen at a time.
 936         // This is according to
 937         // https://doc.qt.io/qt-5/qapplication.html#wheelScrollLines-prop
 938         int scroll_value =
 939                 min(lines * verticalScrollBar()->singleStep(), page_step);
 940
 941         // Take into account the rotation and the user preferences.
 942         scroll_value = int(scroll_value * delta * lyxrc.mouse_wheel_speed);
 943         LYXERR(Debug::SCROLLING, "wheelScrollLines = " << lines
 944                         << " delta = " << delta << " scroll_value = " << scroll_value
 945                         << " page_step = " << page_step);
 946         // Now scroll.
 947         verticalScrollBar()->setValue(verticalScrollBar()->value() - scroll_value);
 948
 949         ev->accept();
 950 }
 951
 952
 953 void GuiWorkArea::generateSyntheticMouseEvent()
 954 {
 955         int const e_y = d->synthetic_mouse_event_.cmd.y();
 956         int const wh = d->buffer_view_->workHeight();
 957         bool const up = e_y < 0;
 958         bool const down = e_y > wh;
 959
 960         // Set things off to generate the _next_ 'pseudo' event.
 961         int step = 50;
 962         if (d->synthetic_mouse_event_.restart_timeout) {
 963                 // This is some magic formulae to determine the speed
 964                 // of scrolling related to the position of the mouse.
 965                 int time = 200;
 966                 if (up || down) {
 967                         int dist = up ? -e_y : e_y - wh;
 968                         time = max(min(200, 250000 / (dist * dist)), 1) ;
 969
 970                         if (time < 40) {
 971                                 step = 80000 / (time * time);
 972                                 time = 40;
 973                         }
 974                 }
 975                 d->synthetic_mouse_event_.timeout.setTimeout(time);
 976                 d->synthetic_mouse_event_.timeout.start();
 977         }
 978
 979         // Can we scroll further ?
 980         int const value = verticalScrollBar()->value();
 981         if (value == verticalScrollBar()->maximum()
 982                   || value == verticalScrollBar()->minimum()) {
 983                 d->synthetic_mouse_event_.timeout.stop();
 984                 return;
 985         }
 986
 987         // Scroll
 988         if (step <= 2 * wh) {
 989                 d->buffer_view_->scroll(up ? -step : step);
 990                 d->buffer_view_->updateMetrics();
 991         } else {
 992                 d->buffer_view_->scrollDocView(value + (up ? -step : step), false);
 993         }
 994
 995         // In which paragraph do we have to set the cursor ?
 996         Cursor & cur = d->buffer_view_->cursor();
 997         // FIXME: we don't know how to handle math.
 998         Text * text = cur.text();
 999         if (!text)
1000                 return;
1001         TextMetrics const & tm = d->buffer_view_->textMetrics(text);
1002
1003         // Quit gracefully if there are no metrics, since otherwise next
1004         // line would crash (bug #10324).
1005         // This situation seems related to a (not yet understood) timing problem.
1006         if (tm.empty())
1007                 return;
1008
1009         pair<pit_type, const ParagraphMetrics *> pp = up ? tm.first() : tm.last();
1010         ParagraphMetrics const & pm = *pp.second;
1011         pit_type const pit = pp.first;
1012
1013         if (pm.rows().empty())
1014                 return;
1015
1016         // Find the row at which we set the cursor.
1017         RowList::const_iterator rit = pm.rows().begin();
1018         RowList::const_iterator rlast = pm.rows().end();
1019         int yy = pm.position() - pm.ascent();
1020         for (--rlast; rit != rlast; ++rit) {
1021                 int h = rit->height();
1022                 if ((up && yy + h > 0)
1023                           || (!up && yy + h > wh - defaultRowHeight()))
1024                         break;
1025                 yy += h;
1026         }
1027
1028         // Find the position of the cursor
1029         bool bound;
1030         int x = d->synthetic_mouse_event_.cmd.x();
1031         pos_type const pos = tm.getPosNearX(*rit, x, bound);
1032
1033         // Set the cursor
1034         cur.pit() = pit;
1035         cur.pos() = pos;
1036         cur.boundary(bound);
1037
1038         d->buffer_view_->buffer().changed(false);
1039         return;
1040 }
1041
1042
1043 // CompressorProxy adapted from Kuba Ober https://stackoverflow.com/a/21006207
1044 CompressorProxy::CompressorProxy(GuiWorkArea * wa) : QObject(wa), flag_(false)
1045 {
1046         qRegisterMetaType<KeySymbol>("KeySymbol");
1047         qRegisterMetaType<KeyModifier>("KeyModifier");
1048         connect(wa, SIGNAL(compressKeySym(KeySymbol, KeyModifier, bool)),
1049                 this, SLOT(slot(KeySymbol, KeyModifier, bool)),
1050                 Qt::QueuedConnection);
1051         connect(this, SIGNAL(signal(KeySymbol, KeyModifier)),
1052                 wa, SLOT(processKeySym(KeySymbol, KeyModifier)));
1053 }
1054
1055
1056 bool CompressorProxy::emitCheck(bool isAutoRepeat)
1057 {
1058         flag_ = true;
1059         if (isAutoRepeat)
1060                 QCoreApplication::sendPostedEvents(this, QEvent::MetaCall); // recurse
1061         bool result = flag_;
1062         flag_ = false;
1063         return result;
1064 }
1065
1066
1067 void CompressorProxy::slot(KeySymbol sym, KeyModifier mod, bool isAutoRepeat)
1068 {
1069         if (emitCheck(isAutoRepeat))
1070                 Q_EMIT signal(sym, mod);
1071         else
1072                 LYXERR(Debug::KEY, "system is busy: autoRepeat key event ignored");
1073 }
1074
1075
1076 void GuiWorkArea::keyPressEvent(QKeyEvent * ev)
1077 {
1078         // this is also called for ShortcutOverride events. In this case, one must
1079         // not act but simply accept the event explicitly.
1080         bool const act = (ev->type() != QEvent::ShortcutOverride);
1081
1082         // Do not process here some keys if dialog_mode_ is set
1083         bool const for_dialog_mode = d->dialog_mode_
1084                 && (ev->modifiers() == Qt::NoModifier
1085                     || ev->modifiers() == Qt::ShiftModifier)
1086                 && (ev->key() == Qt::Key_Escape
1087                     || ev->key() == Qt::Key_Enter
1088                     || ev->key() == Qt::Key_Return);
1089         // also do not use autoRepeat to input shortcuts
1090         bool const autoRepeat = ev->isAutoRepeat();
1091
1092         if (for_dialog_mode || (!act && autoRepeat)) {
1093                 ev->ignore();
1094                 return;
1095         }
1096
1097         // intercept some keys if completion popup is visible
1098         if (d->completer_->popupVisible()) {
1099                 switch (ev->key()) {
1100                 case Qt::Key_Enter:
1101                 case Qt::Key_Return:
1102                         if (act)
1103                                 d->completer_->activate();
1104                         ev->accept();
1105                         return;
1106                 }
1107         }
1108
1109         KeyModifier const m = q_key_state(ev->modifiers());
1110
1111         if (act && lyxerr.debugging(Debug::KEY)) {
1112                 std::string str;
1113                 if (m & ShiftModifier)
1114                         str += "Shift-";
1115                 if (m & ControlModifier)
1116                         str += "Control-";
1117                 if (m & AltModifier)
1118                         str += "Alt-";
1119                 if (m & MetaModifier)
1120                         str += "Meta-";
1121                 LYXERR(Debug::KEY, " count: " << ev->count() << " text: " << ev->text()
1122                        << " isAutoRepeat: " << ev->isAutoRepeat() << " key: " << ev->key()
1123                        << " keyState: " << str);
1124         }
1125
1126         KeySymbol sym;
1127         setKeySymbol(&sym, ev);
1128         if (sym.isOK()) {
1129                 if (act) {
1130                         Q_EMIT compressKeySym(sym, m, autoRepeat);
1131                         ev->accept();
1132                 } else
1133                         // here, !autoRepeat, as determined at the beginning
1134                         ev->setAccepted(queryKeySym(sym, m));
1135         } else {
1136                 ev->ignore();
1137         }
1138 }
1139
1140
1141 void GuiWorkArea::doubleClickTimeout()
1142 {
1143         d->dc_event_.active = false;
1144 }
1145
1146
1147 void GuiWorkArea::mouseDoubleClickEvent(QMouseEvent * ev)
1148 {
1149         d->dc_event_ = DoubleClick(ev);
1150         QTimer::singleShot(QApplication::doubleClickInterval(), this,
1151                         SLOT(doubleClickTimeout()));
1152         FuncRequest cmd(LFUN_MOUSE_DOUBLE, ev->x(), ev->y(),
1153                         q_button_state(ev->button()), q_key_state(ev->modifiers()));
1154         d->dispatch(cmd);
1155         ev->accept();
1156 }
1157
1158
1159 void GuiWorkArea::resizeEvent(QResizeEvent * ev)
1160 {
1161         QAbstractScrollArea::resizeEvent(ev);
1162         d->need_resize_ = true;
1163         ev->accept();
1164 }
1165
1166
1167 void GuiWorkArea::Private::paintPreeditText(GuiPainter & pain)
1168 {
1169         if (preedit_string_.empty())
1170                 return;
1171
1172         // FIXME: shall we use real_current_font here? (see #10478)
1173         FontInfo const font = buffer_view_->cursor().getFont().fontInfo();
1174         FontMetrics const & fm = theFontMetrics(font);
1175         int const height = fm.maxHeight();
1176         int cur_x = caret_->rect().left();
1177         int cur_y = caret_->rect().bottom();
1178
1179         // get attributes of input method cursor.
1180         // cursor_pos : cursor position in preedit string.
1181         size_t cursor_pos = 0;
1182         bool cursor_is_visible = false;
1183         for (auto const & attr : preedit_attr_) {
1184                 if (attr.type == QInputMethodEvent::Cursor) {
1185                         cursor_pos = attr.start;
1186                         cursor_is_visible = attr.length != 0;
1187                         break;
1188                 }
1189         }
1190
1191         size_t const preedit_length = preedit_string_.length();
1192
1193         // get position of selection in input method.
1194         // FIXME: isn't there a way to do this simplier?
1195         // rStart : cursor position in selected string in IM.
1196         size_t rStart = 0;
1197         // rLength : selected string length in IM.
1198         size_t rLength = 0;
1199         if (cursor_pos < preedit_length) {
1200                 for (auto const & attr : preedit_attr_) {
1201                         if (attr.type == QInputMethodEvent::TextFormat) {
1202                                 if (attr.start <= int(cursor_pos)
1203                                         && int(cursor_pos) < attr.start + attr.length) {
1204                                                 rStart = attr.start;
1205                                                 rLength = attr.length;
1206                                                 if (!cursor_is_visible)
1207                                                         cursor_pos += rLength;
1208                                                 break;
1209                                 }
1210                         }
1211                 }
1212         }
1213         else {
1214                 rStart = cursor_pos;
1215                 rLength = 0;
1216         }
1217
1218         int const right_margin = buffer_view_->rightMargin();
1219         Painter::preedit_style ps;
1220         // Most often there would be only one line:
1221         preedit_lines_ = 1;
1222         for (size_t pos = 0; pos != preedit_length; ++pos) {
1223                 char_type const typed_char = preedit_string_[pos];
1224                 // reset preedit string style
1225                 ps = Painter::preedit_default;
1226
1227                 // if we reached the right extremity of the screen, go to next line.
1228                 if (cur_x + fm.width(typed_char) > p->viewport()->width() - right_margin) {
1229                         cur_x = right_margin;
1230                         cur_y += height + 1;
1231                         ++preedit_lines_;
1232                 }
1233                 // preedit strings are displayed with dashed underline
1234                 // and partial strings are displayed white on black indicating
1235                 // that we are in selecting mode in the input method.
1236                 // FIXME: rLength == preedit_length is not a changing condition
1237                 // FIXME: should be put out of the loop.
1238                 if (pos >= rStart
1239                         && pos < rStart + rLength
1240                         && !(cursor_pos < rLength && rLength == preedit_length))
1241                         ps = Painter::preedit_selecting;
1242
1243                 if (pos == cursor_pos
1244                         && (cursor_pos < rLength && rLength == preedit_length))
1245                         ps = Painter::preedit_cursor;
1246
1247                 // draw one character and update cur_x.
1248                 cur_x += pain.preeditText(cur_x, cur_y, typed_char, font, ps);
1249         }
1250 }
1251
1252
1253 void GuiWorkArea::paintEvent(QPaintEvent * ev)
1254 {
1255         // LYXERR(Debug::PAINTING, "paintEvent begin: x: " << rc.x()
1256         //      << " y: " << rc.y() << " w: " << rc.width() << " h: " << rc.height());
1257
1258         if (d->needResize()) {
1259                 d->resizeBufferView();
1260                 if (d->caret_visible_) {
1261                         d->hideCaret();
1262                         d->showCaret();
1263                 }
1264         }
1265
1266         GuiPainter pain(viewport(), pixelRatio());
1267         d->buffer_view_->draw(pain, d->caret_visible_);
1268
1269         // The preedit text, if needed
1270         d->paintPreeditText(pain);
1271
1272         // and the caret
1273         if (d->caret_visible_)
1274                 d->caret_->draw(pain);
1275         ev->accept();
1276 }
1277
1278
1279 void GuiWorkArea::inputMethodEvent(QInputMethodEvent * e)
1280 {
1281         LYXERR(Debug::KEY, "preeditString: " << e->preeditString()
1282                    << " commitString: " << e->commitString());
1283
1284         // insert the processed text in the document (handles undo)
1285         if (!e->commitString().isEmpty()) {
1286                 d->buffer_view_->cursor().beginUndoGroup();
1287                 d->buffer_view_->cursor().insert(qstring_to_ucs4(e->commitString()));
1288                 d->buffer_view_->updateMetrics();
1289                 d->buffer_view_->cursor().endUndoGroup();
1290                 viewport()->update();
1291         }
1292
1293         // Hide the caret during the test transformation.
1294         if (e->preeditString().isEmpty())
1295                 startBlinkingCaret();
1296         else
1297                 stopBlinkingCaret();
1298
1299         if (d->preedit_string_.empty() && e->preeditString().isEmpty()) {
1300                 // Nothing to do
1301                 e->accept();
1302                 return;
1303         }
1304
1305         // The preedit text and its attributes will be used in paintPreeditText
1306         d->preedit_string_ = qstring_to_ucs4(e->preeditString());
1307         d->preedit_attr_ = e->attributes();
1308
1309
1310         // redraw area of preedit string.
1311         int height = d->caret_->rect().height();
1312         int cur_y = d->caret_->rect().bottom();
1313         viewport()->update(0, cur_y - height, viewport()->width(),
1314                 (height + 1) * d->preedit_lines_);
1315
1316         if (d->preedit_string_.empty()) {
1317                 d->preedit_lines_ = 1;
1318                 e->accept();
1319                 return;
1320         }
1321
1322         // Don't forget to accept the event!
1323         e->accept();
1324 }
1325
1326
1327 QVariant GuiWorkArea::inputMethodQuery(Qt::InputMethodQuery query) const
1328 {
1329         QRect cur_r(0, 0, 0, 0);
1330         switch (query) {
1331                 // this is the CJK-specific composition window position and
1332                 // the context menu position when the menu key is pressed.
1333                 case Qt::ImMicroFocus:
1334                         cur_r = d->caret_->rect();
1335                         if (d->preedit_lines_ != 1)
1336                                 cur_r.moveLeft(10);
1337                         cur_r.moveBottom(cur_r.bottom()
1338                                 + cur_r.height() * (d->preedit_lines_ - 1));
1339                         // return lower right of caret in LyX.
1340                         return cur_r;
1341                 default:
1342                         return QWidget::inputMethodQuery(query);
1343         }
1344 }
1345
1346
1347 void GuiWorkArea::updateWindowTitle()
1348 {
1349         Buffer const & buf = bufferView().buffer();
1350         if (buf.fileName() != d->file_name_
1351             || buf.params().shell_escape != d->shell_escape_
1352             || buf.hasReadonlyFlag() != d->read_only_
1353             || buf.lyxvc().vcstatus() != d->vc_status_
1354             || buf.isClean() != d->clean_
1355             || buf.notifiesExternalModification() != d->externally_modified_) {
1356                 d->file_name_ = buf.fileName();
1357                 d->shell_escape_ = buf.params().shell_escape;
1358                 d->read_only_ = buf.hasReadonlyFlag();
1359                 d->vc_status_ = buf.lyxvc().vcstatus();
1360                 d->clean_ = buf.isClean();
1361                 d->externally_modified_ = buf.notifiesExternalModification();
1362                 Q_EMIT titleChanged(this);
1363         }
1364 }
1365
1366
1367 bool GuiWorkArea::isFullScreen() const
1368 {
1369         return d->lyx_view_ && d->lyx_view_->isFullScreen();
1370 }
1371
1372
1373 void GuiWorkArea::scheduleRedraw()
1374 {
1375         d->schedule_redraw_ = true;
1376 }
1377
1378
1379 bool GuiWorkArea::inDialogMode() const
1380 {
1381         return d->dialog_mode_;
1382 }
1383
1384
1385 void GuiWorkArea::setDialogMode(bool mode)
1386 {
1387         d->dialog_mode_ = mode;
1388 }
1389
1390
1391 GuiCompleter & GuiWorkArea::completer()
1392 {
1393         return *d->completer_;
1394 }
1395
1396 GuiView const & GuiWorkArea::view() const
1397 {
1398         return *d->lyx_view_;
1399 }
1400
1401
1402 GuiView & GuiWorkArea::view()
1403 {
1404         return *d->lyx_view_;
1405 }
1406
1407 ////////////////////////////////////////////////////////////////////
1408 //
1409 // EmbeddedWorkArea
1410 //
1411 ////////////////////////////////////////////////////////////////////
1412
1413
1414 EmbeddedWorkArea::EmbeddedWorkArea(QWidget * w): GuiWorkArea(w)
1415 {
1416         support::TempFile tempfile("embedded.internal");
1417         tempfile.setAutoRemove(false);
1418         buffer_ = theBufferList().newInternalBuffer(tempfile.name().absFileName());
1419         buffer_->setUnnamed(true);
1420         buffer_->setFullyLoaded(true);
1421         setBuffer(*buffer_);
1422         setDialogMode(true);
1423 }
1424
1425
1426 EmbeddedWorkArea::~EmbeddedWorkArea()
1427 {
1428         // No need to destroy buffer and bufferview here, because it is done
1429         // in theBufferList() destruction loop at application exit
1430 }
1431
1432
1433 void EmbeddedWorkArea::closeEvent(QCloseEvent * ev)
1434 {
1435         disable();
1436         GuiWorkArea::closeEvent(ev);
1437 }
1438
1439
1440 void EmbeddedWorkArea::hideEvent(QHideEvent * ev)
1441 {
1442         disable();
1443         GuiWorkArea::hideEvent(ev);
1444 }
1445
1446
1447 QSize EmbeddedWorkArea::sizeHint () const
1448 {
1449         // FIXME(?):
1450         // GuiWorkArea sets the size to the screen's viewport
1451         // by returning a value this gets overridden
1452         // EmbeddedWorkArea is now sized to fit in the layout
1453         // of the parent, and has a minimum size set in GuiWorkArea
1454         // which is what we return here
1455         return QSize(100, 70);
1456 }
1457
1458
1459 void EmbeddedWorkArea::disable()
1460 {
1461         stopBlinkingCaret();
1462         if (view().currentWorkArea() != this)
1463                 return;
1464         // No problem if currentMainWorkArea() is 0 (setCurrentWorkArea()
1465         // tolerates it and shows the background logo), what happens if
1466         // an EmbeddedWorkArea is closed after closing all document WAs
1467         view().setCurrentWorkArea(view().currentMainWorkArea());
1468 }
1469
1470 ////////////////////////////////////////////////////////////////////
1471 //
1472 // TabWorkArea
1473 //
1474 ////////////////////////////////////////////////////////////////////
1475
1476 #ifdef Q_OS_MAC
1477 class NoTabFrameMacStyle : public QProxyStyle {
1478 public:
1479         ///
1480         QRect subElementRect(SubElement element, const QStyleOption * option,
1481                              const QWidget * widget = 0) const
1482         {
1483                 QRect rect = QProxyStyle::subElementRect(element, option, widget);
1484                 bool noBar = static_cast<QTabWidget const *>(widget)->count() <= 1;
1485
1486                 // The Qt Mac style puts the contents into a 3 pixel wide box
1487                 // which looks very ugly and not like other Mac applications.
1488                 // Hence we remove this here, and moreover the 16 pixel round
1489                 // frame above if the tab bar is hidden.
1490                 if (element == QStyle::SE_TabWidgetTabContents) {
1491                         rect.adjust(- rect.left(), 0, rect.left(), 0);
1492                         if (noBar)
1493                                 rect.setTop(0);
1494                 }
1495
1496                 return rect;
1497         }
1498 };
1499
1500 NoTabFrameMacStyle noTabFrameMacStyle;
1501 #endif
1502
1503
1504 TabWorkArea::TabWorkArea(QWidget * parent)
1505         : QTabWidget(parent), clicked_tab_(-1), midpressed_tab_(-1)
1506 {
1507 #ifdef Q_OS_MAC
1508         setStyle(&noTabFrameMacStyle);
1509 #endif
1510
1511         QPalette pal = palette();
1512         pal.setColor(QPalette::Active, QPalette::Button,
1513                 pal.color(QPalette::Active, QPalette::Window));
1514         pal.setColor(QPalette::Disabled, QPalette::Button,
1515                 pal.color(QPalette::Disabled, QPalette::Window));
1516         pal.setColor(QPalette::Inactive, QPalette::Button,
1517                 pal.color(QPalette::Inactive, QPalette::Window));
1518
1519         QObject::connect(this, SIGNAL(currentChanged(int)),
1520                 this, SLOT(on_currentTabChanged(int)));
1521
1522         closeBufferButton = new QToolButton(this);
1523         closeBufferButton->setPalette(pal);
1524         // FIXME: rename the icon to closebuffer.png
1525         closeBufferButton->setIcon(QIcon(getPixmap("images/", "closetab", "svgz,png")));
1526         closeBufferButton->setText("Close File");
1527         closeBufferButton->setAutoRaise(true);
1528         closeBufferButton->setCursor(Qt::ArrowCursor);
1529         closeBufferButton->setToolTip(qt_("Close File"));
1530         closeBufferButton->setEnabled(true);
1531         QObject::connect(closeBufferButton, SIGNAL(clicked()),
1532                 this, SLOT(closeCurrentBuffer()));
1533         setCornerWidget(closeBufferButton, Qt::TopRightCorner);
1534
1535         // setup drag'n'drop
1536         QTabBar* tb = new DragTabBar;
1537         connect(tb, SIGNAL(tabMoveRequested(int, int)),
1538                 this, SLOT(moveTab(int, int)));
1539         tb->setElideMode(Qt::ElideNone);
1540         setTabBar(tb);
1541
1542         // make us responsible for the context menu of the tabbar
1543         tb->setContextMenuPolicy(Qt::CustomContextMenu);
1544         connect(tb, SIGNAL(customContextMenuRequested(const QPoint &)),
1545                 this, SLOT(showContextMenu(const QPoint &)));
1546         connect(tb, SIGNAL(tabCloseRequested(int)),
1547                 this, SLOT(closeTab(int)));
1548
1549         setUsesScrollButtons(true);
1550 }
1551
1552
1553 void TabWorkArea::mousePressEvent(QMouseEvent *me)
1554 {
1555         if (me->button() == Qt::MidButton)
1556                 midpressed_tab_ = tabBar()->tabAt(me->pos());
1557         else
1558                 QTabWidget::mousePressEvent(me);
1559 }
1560
1561
1562 void TabWorkArea::mouseReleaseEvent(QMouseEvent *me)
1563 {
1564         if (me->button() == Qt::MidButton) {
1565                 int const midreleased_tab = tabBar()->tabAt(me->pos());
1566                 if (midpressed_tab_ == midreleased_tab && posIsTab(me->pos()))
1567                         closeTab(midreleased_tab);
1568         } else
1569                 QTabWidget::mouseReleaseEvent(me);
1570 }
1571
1572
1573 void TabWorkArea::paintEvent(QPaintEvent * event)
1574 {
1575         if (tabBar()->isVisible()) {
1576                 QTabWidget::paintEvent(event);
1577         } else {
1578                 // Prevent the selected tab to influence the
1579                 // painting of the frame of the tab widget.
1580                 // This is needed for gtk style in Qt.
1581                 QStylePainter p(this);
1582 #if QT_VERSION < 0x050000
1583                 QStyleOptionTabWidgetFrameV2 opt;
1584 #else
1585                 QStyleOptionTabWidgetFrame opt;
1586 #endif
1587                 initStyleOption(&opt);
1588                 opt.rect = style()->subElementRect(QStyle::SE_TabWidgetTabPane,
1589                         &opt, this);
1590                 opt.selectedTabRect = QRect();
1591                 p.drawPrimitive(QStyle::PE_FrameTabWidget, opt);
1592         }
1593 }
1594
1595
1596 bool TabWorkArea::posIsTab(QPoint position)
1597 {
1598         // tabAt returns -1 if tab does not covers position
1599         return tabBar()->tabAt(position) > -1;
1600 }
1601
1602
1603 void TabWorkArea::mouseDoubleClickEvent(QMouseEvent * event)
1604 {
1605         if (event->button() != Qt::LeftButton)
1606                 return;
1607
1608         // this code chunk is unnecessary because it seems the event only makes
1609         // it this far if it is not on a tab. I'm not sure why this is (maybe
1610         // it is handled and ended in DragTabBar?), and thus I'm not sure if
1611         // this is true in all cases and if it will be true in the future so I
1612         // leave this code for now. (skostysh, 2016-07-21)
1613         //
1614         // return early if double click on existing tabs
1615         if (posIsTab(event->pos()))
1616                 return;
1617
1618         dispatch(FuncRequest(LFUN_BUFFER_NEW));
1619 }
1620
1621
1622 void TabWorkArea::setFullScreen(bool full_screen)
1623 {
1624         for (int i = 0; i != count(); ++i) {
1625                 if (GuiWorkArea * wa = workArea(i))
1626                         wa->setFullScreen(full_screen);
1627         }
1628
1629         if (lyxrc.full_screen_tabbar)
1630                 showBar(!full_screen && count() > 1);
1631         else
1632                 showBar(count() > 1);
1633 }
1634
1635
1636 void TabWorkArea::showBar(bool show)
1637 {
1638         tabBar()->setEnabled(show);
1639         tabBar()->setVisible(show);
1640         closeBufferButton->setVisible(show && lyxrc.single_close_tab_button);
1641         setTabsClosable(!lyxrc.single_close_tab_button);
1642 }
1643
1644
1645 GuiWorkAreaContainer * TabWorkArea::widget(int index) const
1646 {
1647         QWidget * w = QTabWidget::widget(index);
1648         if (!w)
1649                 return nullptr;
1650         GuiWorkAreaContainer * wac = dynamic_cast<GuiWorkAreaContainer *>(w);
1651         LATTEST(wac);
1652         return wac;
1653 }
1654
1655
1656 GuiWorkAreaContainer * TabWorkArea::currentWidget() const
1657 {
1658         return widget(currentIndex());
1659 }
1660
1661
1662 GuiWorkArea * TabWorkArea::workArea(int index) const
1663 {
1664         GuiWorkAreaContainer * w = widget(index);
1665         if (!w)
1666                 return nullptr;
1667         return w->workArea();
1668 }
1669
1670
1671 GuiWorkArea * TabWorkArea::currentWorkArea() const
1672 {
1673         return workArea(currentIndex());
1674 }
1675
1676
1677 GuiWorkArea * TabWorkArea::workArea(Buffer & buffer) const
1678 {
1679         // FIXME: this method doesn't work if we have more than one work area
1680         // showing the same buffer.
1681         for (int i = 0; i != count(); ++i) {
1682                 GuiWorkArea * wa = workArea(i);
1683                 LASSERT(wa, return 0);
1684                 if (&wa->bufferView().buffer() == &buffer)
1685                         return wa;
1686         }
1687         return 0;
1688 }
1689
1690
1691 void TabWorkArea::closeAll()
1692 {
1693         while (count()) {
1694                 QWidget * wac = widget(0);
1695                 LASSERT(wac, return);
1696                 removeTab(0);
1697                 delete wac;
1698         }
1699 }
1700
1701
1702 int TabWorkArea::indexOfWorkArea(GuiWorkArea * w) const
1703 {
1704         for (int index = 0; index < count(); ++index)
1705                 if (workArea(index) == w)
1706                         return index;
1707         return -1;
1708 }
1709
1710
1711 bool TabWorkArea::setCurrentWorkArea(GuiWorkArea * work_area)
1712 {
1713         LASSERT(work_area, return false);
1714         int index = indexOfWorkArea(work_area);
1715         if (index == -1)
1716                 return false;
1717
1718         if (index == currentIndex())
1719                 // Make sure the work area is up to date.
1720                 on_currentTabChanged(index);
1721         else
1722                 // Switch to the work area.
1723                 setCurrentIndex(index);
1724         work_area->setFocus();
1725
1726         return true;
1727 }
1728
1729
1730 GuiWorkArea * TabWorkArea::addWorkArea(Buffer & buffer, GuiView & view)
1731 {
1732         GuiWorkArea * wa = new GuiWorkArea(buffer, view);
1733         GuiWorkAreaContainer * wac = new GuiWorkAreaContainer(wa);
1734         wa->setUpdatesEnabled(false);
1735         // Hide tabbar if there's no tab (avoid a resize and a flashing tabbar
1736         // when hiding it again below).
1737         if (!(currentWorkArea() && currentWorkArea()->isFullScreen()))
1738                 showBar(count() > 0);
1739         addTab(wac, wa->windowTitle());
1740         QObject::connect(wa, SIGNAL(titleChanged(GuiWorkArea *)),
1741                 this, SLOT(updateTabTexts()));
1742         if (currentWorkArea() && currentWorkArea()->isFullScreen())
1743                 setFullScreen(true);
1744         else
1745                 // Hide tabbar if there's only one tab.
1746                 showBar(count() > 1);
1747
1748         updateTabTexts();
1749
1750         return wa;
1751 }
1752
1753
1754 bool TabWorkArea::removeWorkArea(GuiWorkArea * work_area)
1755 {
1756         LASSERT(work_area, return false);
1757         int index = indexOfWorkArea(work_area);
1758         if (index == -1)
1759                 return false;
1760
1761         work_area->setUpdatesEnabled(false);
1762         QWidget * wac = widget(index);
1763         removeTab(index);
1764         delete wac;
1765
1766         if (count()) {
1767                 // make sure the next work area is enabled.
1768                 currentWidget()->setUpdatesEnabled(true);
1769                 if (currentWorkArea() && currentWorkArea()->isFullScreen())
1770                         setFullScreen(true);
1771                 else
1772                         // Show tabbar only if there's more than one tab.
1773                         showBar(count() > 1);
1774         } else
1775                 lastWorkAreaRemoved();
1776
1777         updateTabTexts();
1778
1779         return true;
1780 }
1781
1782
1783 void TabWorkArea::on_currentTabChanged(int i)
1784 {
1785         // returns e.g. on application destruction
1786         if (i == -1)
1787                 return;
1788         GuiWorkArea * wa = workArea(i);
1789         LASSERT(wa, return);
1790         wa->setUpdatesEnabled(true);
1791         wa->redraw(true);
1792         wa->setFocus();
1793         ///
1794         currentWorkAreaChanged(wa);
1795
1796         LYXERR(Debug::GUI, "currentTabChanged " << i
1797                 << " File: " << wa->bufferView().buffer().absFileName());
1798 }
1799
1800
1801 void TabWorkArea::closeCurrentBuffer()
1802 {
1803         GuiWorkArea * wa;
1804         if (clicked_tab_ == -1)
1805                 wa = currentWorkArea();
1806         else {
1807                 wa = workArea(clicked_tab_);
1808                 LASSERT(wa, return);
1809         }
1810         wa->view().closeWorkArea(wa);
1811 }
1812
1813
1814 void TabWorkArea::hideCurrentTab()
1815 {
1816         GuiWorkArea * wa;
1817         if (clicked_tab_ == -1)
1818                 wa = currentWorkArea();
1819         else {
1820                 wa = workArea(clicked_tab_);
1821                 LASSERT(wa, return);
1822         }
1823         wa->view().hideWorkArea(wa);
1824 }
1825
1826
1827 void TabWorkArea::closeTab(int index)
1828 {
1829         on_currentTabChanged(index);
1830         GuiWorkArea * wa;
1831         if (index == -1)
1832                 wa = currentWorkArea();
1833         else {
1834                 wa = workArea(index);
1835                 LASSERT(wa, return);
1836         }
1837         wa->view().closeWorkArea(wa);
1838 }
1839
1840
1841 ///
1842 class DisplayPath {
1843 public:
1844         /// make vector happy
1845         DisplayPath() : tab_(-1), dottedPrefix_(false) {}
1846         ///
1847         DisplayPath(int tab, FileName const & filename)
1848                 : tab_(tab)
1849         {
1850                 filename_ = (filename.extension() == "lyx") ?
1851                         toqstr(filename.onlyFileNameWithoutExt())
1852                         : toqstr(filename.onlyFileName());
1853                 postfix_ = toqstr(filename.absoluteFilePath()).
1854                         split("/", QString::SkipEmptyParts);
1855                 postfix_.pop_back();
1856                 abs_ = toqstr(filename.absoluteFilePath());
1857                 dottedPrefix_ = false;
1858         }
1859
1860         /// Absolute path for debugging.
1861         QString abs() const
1862         {
1863                 return abs_;
1864         }
1865         /// Add the first segment from the postfix or three dots to the prefix.
1866         /// Merge multiple dot tripples. In fact dots are added lazily, i.e. only
1867         /// when really needed.
1868         void shiftPathSegment(bool dotted)
1869         {
1870                 if (postfix_.count() <= 0)
1871                         return;
1872
1873                 if (!dotted) {
1874                         if (dottedPrefix_ && !prefix_.isEmpty())
1875                                 prefix_ += ellipsisSlash_;
1876                         prefix_ += postfix_.front() + "/";
1877                 }
1878                 dottedPrefix_ = dotted && !prefix_.isEmpty();
1879                 postfix_.pop_front();
1880         }
1881         ///
1882         QString displayString() const
1883         {
1884                 if (prefix_.isEmpty())
1885                         return filename_;
1886
1887                 bool dots = dottedPrefix_ || !postfix_.isEmpty();
1888                 return prefix_ + (dots ? ellipsisSlash_ : "") + filename_;
1889         }
1890         ///
1891         QString forecastPathString() const
1892         {
1893                 if (postfix_.count() == 0)
1894                         return displayString();
1895
1896                 return prefix_
1897                         + (dottedPrefix_ ? ellipsisSlash_ : "")
1898                         + postfix_.front() + "/";
1899         }
1900         ///
1901         bool final() const { return postfix_.empty(); }
1902         ///
1903         int tab() const { return tab_; }
1904
1905 private:
1906         /// ".../"
1907         static QString const ellipsisSlash_;
1908         ///
1909         QString prefix_;
1910         ///
1911         QStringList postfix_;
1912         ///
1913         QString filename_;
1914         ///
1915         QString abs_;
1916         ///
1917         int tab_;
1918         ///
1919         bool dottedPrefix_;
1920 };
1921
1922
1923 QString const DisplayPath::ellipsisSlash_ = QString(QChar(0x2026)) + "/";
1924
1925
1926 ///
1927 bool operator<(DisplayPath const & a, DisplayPath const & b)
1928 {
1929         return a.displayString() < b.displayString();
1930 }
1931
1932 ///
1933 bool operator==(DisplayPath const & a, DisplayPath const & b)
1934 {
1935         return a.displayString() == b.displayString();
1936 }
1937
1938
1939 void TabWorkArea::updateTabTexts()
1940 {
1941         size_t n = count();
1942         if (n == 0)
1943                 return;
1944         std::list<DisplayPath> paths;
1945         typedef std::list<DisplayPath>::iterator It;
1946
1947         // collect full names first: path into postfix, empty prefix and
1948         // filename without extension
1949         for (size_t i = 0; i < n; ++i) {
1950                 GuiWorkArea * i_wa = workArea(i);
1951                 FileName const fn = i_wa->bufferView().buffer().fileName();
1952                 paths.push_back(DisplayPath(i, fn));
1953         }
1954
1955         // go through path segments and see if it helps to make the path more unique
1956         bool somethingChanged = true;
1957         bool allFinal = false;
1958         while (somethingChanged && !allFinal) {
1959                 // adding path segments changes order
1960                 paths.sort();
1961
1962                 LYXERR(Debug::GUI, "updateTabTexts() iteration start");
1963                 somethingChanged = false;
1964                 allFinal = true;
1965
1966                 // find segments which are not unique (i.e. non-atomic)
1967                 It it = paths.begin();
1968                 It segStart = it;
1969                 QString segString = it->displayString();
1970                 for (; it != paths.end(); ++it) {
1971                         // look to the next item
1972                         It next = it;
1973                         ++next;
1974
1975                         // final?
1976                         allFinal = allFinal && it->final();
1977
1978                         LYXERR(Debug::GUI, "it = " << it->abs()
1979                                << " => " << it->displayString());
1980
1981                         // still the same segment?
1982                         QString nextString;
1983                         if ((next != paths.end()
1984                              && (nextString = next->displayString()) == segString))
1985                                 continue;
1986                         LYXERR(Debug::GUI, "segment ended");
1987
1988                         // only a trivial one with one element?
1989                         if (it == segStart) {
1990                                 // start new segment
1991                                 segStart = next;
1992                                 segString = nextString;
1993                                 continue;
1994                         }
1995
1996                         // We found a non-atomic segment
1997                         // We know that segStart <= it < next <= paths.end().
1998                         // The assertion below tells coverity about it.
1999                         LATTEST(segStart != paths.end());
2000                         QString dspString = segStart->forecastPathString();
2001                         LYXERR(Debug::GUI, "first forecast found for "
2002                                << segStart->abs() << " => " << dspString);
2003                         It sit = segStart;
2004                         ++sit;
2005                         // Shift path segments and hope for the best
2006                         // that it makes the path more unique.
2007                         somethingChanged = true;
2008                         bool moreUnique = false;
2009                         for (; sit != next; ++sit) {
2010                                 if (sit->forecastPathString() != dspString) {
2011                                         LYXERR(Debug::GUI, "different forecast found for "
2012                                                 << sit->abs() << " => " << sit->forecastPathString());
2013                                         moreUnique = true;
2014                                         break;
2015                                 }
2016                                 LYXERR(Debug::GUI, "same forecast found for "
2017                                         << sit->abs() << " => " << dspString);
2018                         }
2019
2020                         // if the path segment helped, add it. Otherwise add dots
2021                         bool dots = !moreUnique;
2022                         LYXERR(Debug::GUI, "using dots = " << dots);
2023                         for (sit = segStart; sit != next; ++sit) {
2024                                 sit->shiftPathSegment(dots);
2025                                 LYXERR(Debug::GUI, "shifting "
2026                                         << sit->abs() << " => " << sit->displayString());
2027                         }
2028
2029                         // start new segment
2030                         segStart = next;
2031                         segString = nextString;
2032                 }
2033         }
2034
2035         // set new tab titles
2036         for (It it = paths.begin(); it != paths.end(); ++it) {
2037                 int const tab_index = it->tab();
2038                 Buffer const & buf = workArea(tab_index)->bufferView().buffer();
2039                 QString tab_text = it->displayString().replace("&", "&&");
2040                 if (!buf.fileName().empty() && !buf.isClean())
2041                         tab_text += "*";
2042                 QString tab_tooltip = it->abs();
2043                 if (buf.hasReadonlyFlag()) {
2044                         setTabIcon(tab_index, QIcon(getPixmap("images/", "emblem-readonly", "svgz,png")));
2045                         tab_tooltip = qt_("%1 (read only)").arg(tab_tooltip);
2046                 } else
2047                         setTabIcon(tab_index, QIcon());
2048                 if (buf.notifiesExternalModification()) {
2049                         QString const warn = qt_("%1 (modified externally)");
2050                         tab_tooltip = warn.arg(tab_tooltip);
2051                         tab_text += QChar(0x26a0);
2052                 }
2053                 setTabText(tab_index, tab_text);
2054                 setTabToolTip(tab_index, tab_tooltip);
2055         }
2056 }
2057
2058
2059 void TabWorkArea::showContextMenu(const QPoint & pos)
2060 {
2061         // which tab?
2062         clicked_tab_ = static_cast<DragTabBar *>(tabBar())->tabAt(pos);
2063         if (clicked_tab_ == -1)
2064                 return;
2065
2066         // show tab popup
2067         QMenu popup;
2068         popup.addAction(QIcon(getPixmap("images/", "hidetab", "svgz,png")),
2069                 qt_("Hide tab"), this, SLOT(hideCurrentTab()));
2070         popup.addAction(QIcon(getPixmap("images/", "closetab", "svgz,png")),
2071                 qt_("Close tab"), this, SLOT(closeCurrentBuffer()));
2072         popup.exec(tabBar()->mapToGlobal(pos));
2073
2074         clicked_tab_ = -1;
2075 }
2076
2077
2078 void TabWorkArea::moveTab(int fromIndex, int toIndex)
2079 {
2080         QWidget * w = widget(fromIndex);
2081         QIcon icon = tabIcon(fromIndex);
2082         QString text = tabText(fromIndex);
2083
2084         setCurrentIndex(fromIndex);
2085         removeTab(fromIndex);
2086         insertTab(toIndex, w, icon, text);
2087         setCurrentIndex(toIndex);
2088 }
2089
2090
2091 DragTabBar::DragTabBar(QWidget* parent)
2092         : QTabBar(parent)
2093 {
2094         setAcceptDrops(true);
2095         setTabsClosable(!lyxrc.single_close_tab_button);
2096 }
2097
2098
2099 void DragTabBar::mousePressEvent(QMouseEvent * event)
2100 {
2101         if (event->button() == Qt::LeftButton)
2102                 dragStartPos_ = event->pos();
2103         QTabBar::mousePressEvent(event);
2104 }
2105
2106
2107 void DragTabBar::mouseMoveEvent(QMouseEvent * event)
2108 {
2109         // If the left button isn't pressed anymore then return
2110         if (!(event->buttons() & Qt::LeftButton))
2111                 return;
2112
2113         // If the distance is too small then return
2114         if ((event->pos() - dragStartPos_).manhattanLength()
2115             < QApplication::startDragDistance())
2116                 return;
2117
2118         // did we hit something after all?
2119         int tab = tabAt(dragStartPos_);
2120         if (tab == -1)
2121                 return;
2122
2123         // simulate button release to remove highlight from button
2124         int i = currentIndex();
2125         QMouseEvent me(QEvent::MouseButtonRelease, dragStartPos_,
2126                 event->button(), event->buttons(), 0);
2127         QTabBar::mouseReleaseEvent(&me);
2128         setCurrentIndex(i);
2129
2130         // initiate Drag
2131         QDrag * drag = new QDrag(this);
2132         QMimeData * mimeData = new QMimeData;
2133         // a crude way to distinguish tab-reodering drops from other ones
2134         mimeData->setData("action", "tab-reordering") ;
2135         drag->setMimeData(mimeData);
2136
2137         // get tab pixmap as cursor
2138         QRect r = tabRect(tab);
2139         QPixmap pixmap(r.size());
2140         render(&pixmap, - r.topLeft());
2141         drag->setPixmap(pixmap);
2142         drag->exec();
2143 }
2144
2145
2146 void DragTabBar::dragEnterEvent(QDragEnterEvent * event)
2147 {
2148         // Only accept if it's an tab-reordering request
2149         QMimeData const * m = event->mimeData();
2150         QStringList formats = m->formats();
2151         if (formats.contains("action")
2152             && m->data("action") == "tab-reordering")
2153                 event->acceptProposedAction();
2154 }
2155
2156
2157 void DragTabBar::dropEvent(QDropEvent * event)
2158 {
2159         int fromIndex = tabAt(dragStartPos_);
2160         int toIndex = tabAt(event->pos());
2161
2162         // Tell interested objects that
2163         if (fromIndex != toIndex)
2164                 tabMoveRequested(fromIndex, toIndex);
2165         event->acceptProposedAction();
2166 }
2167
2168
2169 GuiWorkAreaContainer::GuiWorkAreaContainer(GuiWorkArea * wa, QWidget * parent)
2170         : QWidget(parent), wa_(wa)
2171 {
2172         LASSERT(wa, return);
2173         Ui::WorkAreaUi::setupUi(this);
2174         layout()->addWidget(wa);
2175         connect(wa, SIGNAL(titleChanged(GuiWorkArea *)),
2176                 this, SLOT(updateDisplay()));
2177         connect(reloadPB, SIGNAL(clicked()), this, SLOT(reload()));
2178         connect(ignorePB, SIGNAL(clicked()), this, SLOT(ignore()));
2179         setMessageColour({notificationFrame}, {reloadPB, ignorePB});
2180         updateDisplay();
2181 }
2182
2183
2184 void GuiWorkAreaContainer::updateDisplay()
2185 {
2186         Buffer const & buf = wa_->bufferView().buffer();
2187         notificationFrame->setHidden(!buf.notifiesExternalModification());
2188         QString const label = qt_("<b>The file %1 changed on disk.</b>")
2189                 .arg(toqstr(buf.fileName().displayName()));
2190         externalModificationLabel->setText(label);
2191 }
2192
2193
2194 void GuiWorkAreaContainer::dispatch(FuncRequest f) const
2195 {
2196         lyx::dispatch(FuncRequest(LFUN_BUFFER_SWITCH,
2197                                   wa_->bufferView().buffer().absFileName()));
2198         lyx::dispatch(f);
2199 }
2200
2201
2202 void GuiWorkAreaContainer::reload() const
2203 {
2204         dispatch(FuncRequest(LFUN_BUFFER_RELOAD));
2205 }
2206
2207
2208 void GuiWorkAreaContainer::ignore() const
2209 {
2210         dispatch(FuncRequest(LFUN_BUFFER_EXTERNAL_MODIFICATION_CLEAR));
2211 }
2212
2213
2214 void GuiWorkAreaContainer::mouseDoubleClickEvent(QMouseEvent * event)
2215 {
2216         // prevent TabWorkArea from opening a new buffer on double click
2217         event->accept();
2218 }
2219
2220
2221 } // namespace frontend
2222 } // namespace lyx
2223
2224 #include "moc_GuiWorkArea.cpp"