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), preedit_lines_(1),
 241   last_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         d->resetScreen();
 310         // With Qt4.5 a mouse event will happen before the first paint event
 311         // so make sure that the buffer view has an up to date metrics.
 312         d->buffer_view_->resize(viewport()->width(), viewport()->height());
 313         d->caret_ = new frontend::CaretWidget();
 314
 315         setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 316         setAcceptDrops(true);
 317         setMouseTracking(true);
 318         setMinimumSize(100, 70);
 319         setFrameStyle(QFrame::NoFrame);
 320         updateWindowTitle();
 321
 322         d->updateCursorShape();
 323
 324         // we paint our own background
 325         viewport()->setAttribute(Qt::WA_OpaquePaintEvent);
 326
 327         setFocusPolicy(Qt::StrongFocus);
 328
 329         LYXERR(Debug::GUI, "viewport width: " << viewport()->width()
 330                 << "  viewport height: " << viewport()->height());
 331
 332         // Enables input methods for asian languages.
 333         // Must be set when creating custom text editing widgets.
 334         setAttribute(Qt::WA_InputMethodEnabled, true);
 335 }
 336
 337
 338 GuiWorkArea::~GuiWorkArea()
 339 {
 340         delete d;
 341 }
 342
 343
 344 void GuiWorkArea::Private::updateCursorShape()
 345 {
 346         bool const clickable = buffer_view_ && buffer_view_->clickableInset();
 347         p->viewport()->setCursor(clickable ? Qt::PointingHandCursor
 348                                            : Qt::IBeamCursor);
 349 }
 350
 351
 352 void GuiWorkArea::setGuiView(GuiView & gv)
 353 {
 354         d->lyx_view_ = &gv;
 355 }
 356
 357
 358 void GuiWorkArea::setBuffer(Buffer & buffer)
 359 {
 360         delete d->buffer_view_;
 361         d->buffer_view_ = new BufferView(buffer);
 362         buffer.workAreaManager().add(this);
 363
 364         // HACK: Prevents an additional redraw when the scrollbar pops up
 365         // which regularily happens on documents with more than one page.
 366         // The policy  should be set to "Qt::ScrollBarAsNeeded" soon.
 367         // Since we have no geometry information yet, we assume that
 368         // a document needs a scrollbar if there is more then four
 369         // paragraph in the outermost text.
 370         if (buffer.text().paragraphs().size() > 4)
 371                 setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
 372         QTimer::singleShot(50, this, SLOT(fixVerticalScrollBar()));
 373         Q_EMIT bufferViewChanged();
 374 }
 375
 376
 377 void GuiWorkArea::fixVerticalScrollBar()
 378 {
 379         if (!isFullScreen())
 380                 setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
 381 }
 382
 383
 384 void GuiWorkArea::close()
 385 {
 386         d->lyx_view_->removeWorkArea(this);
 387 }
 388
 389
 390 void GuiWorkArea::setFullScreen(bool full_screen)
 391 {
 392         d->buffer_view_->setFullScreen(full_screen);
 393         setFrameStyle(QFrame::NoFrame);
 394         if (full_screen) {
 395                 setFrameStyle(QFrame::NoFrame);
 396                 if (lyxrc.full_screen_scrollbar)
 397                         setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 398         } else
 399                 setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
 400 }
 401
 402
 403 BufferView & GuiWorkArea::bufferView()
 404 {
 405         return *d->buffer_view_;
 406 }
 407
 408
 409 BufferView const & GuiWorkArea::bufferView() const
 410 {
 411         return *d->buffer_view_;
 412 }
 413
 414
 415 void GuiWorkArea::stopBlinkingCaret()
 416 {
 417         d->caret_timeout_.stop();
 418         d->hideCaret();
 419 }
 420
 421
 422 void GuiWorkArea::startBlinkingCaret()
 423 {
 424         // do not show the cursor if the view is busy
 425         if (view().busy())
 426                 return;
 427
 428         Point p;
 429         int h = 0;
 430         d->buffer_view_->caretPosAndHeight(p, h);
 431         // Don't start blinking if the cursor isn't on screen.
 432         if (!d->buffer_view_->cursorInView(p, h))
 433                 return;
 434
 435         d->showCaret();
 436
 437         //we're not supposed to cache this value.
 438         int const time = QApplication::cursorFlashTime() / 2;
 439         if (time <= 0)
 440                 return;
 441         d->caret_timeout_.setInterval(time);
 442         d->caret_timeout_.start();
 443 }
 444
 445
 446 void GuiWorkArea::toggleCaret()
 447 {
 448         if (d->caret_visible_)
 449                 d->hideCaret();
 450         else
 451                 d->showCaret();
 452 }
 453
 454
 455 void GuiWorkArea::scheduleRedraw(bool update_metrics)
 456 {
 457         if (!isVisible())
 458                 // No need to redraw in this case.
 459                 return;
 460
 461         // No need to do anything if this is the current view. The BufferView
 462         // metrics are already up to date.
 463         if (update_metrics || d->lyx_view_ != guiApp->currentView()
 464                 || d->lyx_view_->currentWorkArea() != this) {
 465                 // FIXME: it would be nice to optimize for the off-screen case.
 466                 d->buffer_view_->cursor().fixIfBroken();
 467                 d->buffer_view_->updateMetrics();
 468                 d->buffer_view_->cursor().fixIfBroken();
 469         }
 470
 471         // update caret position, because otherwise it has to wait until
 472         // the blinking interval is over
 473         d->updateCaretGeometry();
 474
 475         LYXERR(Debug::WORKAREA, "WorkArea::redraw screen");
 476         viewport()->update();
 477
 478         /// FIXME: is this still true now that paintEvent does the actual painting?
 479         /// \warning: scrollbar updating *must* be done after the BufferView is drawn
 480         /// because \c BufferView::updateScrollbar() is called in \c BufferView::draw().
 481         d->updateScrollbar();
 482         d->lyx_view_->updateStatusBar();
 483
 484         if (lyxerr.debugging(Debug::WORKAREA))
 485                 d->buffer_view_->coordCache().dump();
 486
 487         updateWindowTitle();
 488
 489         d->updateCursorShape();
 490 }
 491
 492
 493 // Keep in sync with GuiWorkArea::processKeySym below
 494 bool GuiWorkArea::queryKeySym(KeySymbol const & key, KeyModifier mod) const
 495 {
 496         return guiApp->queryKeySym(key, mod);
 497 }
 498
 499
 500 // Keep in sync with GuiWorkArea::queryKeySym above
 501 void GuiWorkArea::processKeySym(KeySymbol const & key, KeyModifier mod)
 502 {
 503         if (d->lyx_view_->isFullScreen() && d->lyx_view_->menuBar()->isVisible()
 504                 && lyxrc.full_screen_menubar) {
 505                 // FIXME HACK: we should not have to do this here. See related comment
 506                 // in GuiView::event() (QEvent::ShortcutOverride)
 507                 d->lyx_view_->menuBar()->hide();
 508         }
 509
 510         // In order to avoid bad surprise in the middle of an operation,
 511         // we better stop the blinking caret...
 512         // the caret gets restarted in GuiView::restartCaret()
 513         stopBlinkingCaret();
 514         guiApp->processKeySym(key, mod);
 515 }
 516
 517
 518 void GuiWorkArea::Private::dispatch(FuncRequest const & cmd)
 519 {
 520         // Handle drag&drop
 521         if (cmd.action() == LFUN_FILE_OPEN) {
 522                 DispatchResult dr;
 523                 lyx_view_->dispatch(cmd, dr);
 524                 return;
 525         }
 526
 527         bool const notJustMovingTheMouse =
 528                 cmd.action() != LFUN_MOUSE_MOTION || cmd.button() != mouse_button::none;
 529
 530         // In order to avoid bad surprise in the middle of an operation, we better stop
 531         // the blinking caret.
 532         if (notJustMovingTheMouse)
 533                 p->stopBlinkingCaret();
 534
 535         buffer_view_->mouseEventDispatch(cmd);
 536
 537         // Skip these when selecting
 538         // FIXME: let GuiView take care of those.
 539         if (cmd.action() != LFUN_MOUSE_MOTION) {
 540                 completer_->updateVisibility(false, false);
 541                 lyx_view_->updateDialogs();
 542                 lyx_view_->updateStatusBar();
 543         }
 544
 545         // GUI tweaks except with mouse motion with no button pressed.
 546         if (notJustMovingTheMouse) {
 547                 // Slight hack: this is only called currently when we
 548                 // clicked somewhere, so we force through the display
 549                 // of the new status here.
 550                 // FIXME: let GuiView take care of those.
 551                 lyx_view_->clearMessage();
 552
 553                 // Show the caret immediately after any operation
 554                 p->startBlinkingCaret();
 555         }
 556
 557         updateCursorShape();
 558 }
 559
 560
 561 void GuiWorkArea::Private::resizeBufferView()
 562 {
 563         // WARNING: Please don't put any code that will trigger a repaint here!
 564         // We are already inside a paint event.
 565         p->stopBlinkingCaret();
 566         // Warn our container (GuiView).
 567         p->busy(true);
 568
 569         Point point;
 570         int h = 0;
 571         buffer_view_->caretPosAndHeight(point, h);
 572         bool const caret_in_view = buffer_view_->cursorInView(point, h);
 573         buffer_view_->resize(p->viewport()->width(), p->viewport()->height());
 574         if (caret_in_view)
 575                 buffer_view_->scrollToCursor();
 576         updateCaretGeometry();
 577
 578         // Update scrollbars which might have changed due different
 579         // BufferView dimension. This is especially important when the
 580         // BufferView goes from zero-size to the real-size for the first time,
 581         // as the scrollbar paramters are then set for the first time.
 582         updateScrollbar();
 583
 584         need_resize_ = false;
 585         p->busy(false);
 586         // Eventually, restart the caret after the resize event.
 587         // We might be resizing even if the focus is on another widget so we only
 588         // restart the caret if we have the focus.
 589         if (p->hasFocus())
 590                 QTimer::singleShot(50, p, SLOT(startBlinkingCaret()));
 591 }
 592
 593
 594 void GuiWorkArea::Private::updateCaretGeometry()
 595 {
 596         Point point;
 597         int h = 0;
 598         buffer_view_->caretPosAndHeight(point, h);
 599         if (!buffer_view_->cursorInView(point, h))
 600                 return;
 601
 602         // RTL or not RTL
 603         bool l_shape = false;
 604         Font const & realfont = buffer_view_->cursor().real_current_font;
 605         BufferParams const & bp = buffer_view_->buffer().params();
 606         bool const samelang = realfont.language() == bp.language;
 607         bool const isrtl = realfont.isVisibleRightToLeft();
 608
 609         if (!samelang || isrtl != bp.language->rightToLeft())
 610                 l_shape = true;
 611
 612         // The ERT language hack needs fixing up
 613         if (realfont.language() == latex_language)
 614                 l_shape = false;
 615
 616         // show caret on screen
 617         Cursor & cur = buffer_view_->cursor();
 618         bool completable = cur.inset().showCompletionCursor()
 619                 && completer_->completionAvailable()
 620                 && !completer_->popupVisible()
 621                 && !completer_->inlineVisible();
 622         caret_visible_ = true;
 623
 624         //int cur_x = buffer_view_->getPos(cur).x_;
 625         // We may have decided to slide the cursor row so that caret
 626         // is visible.
 627         point.x_ -= buffer_view_->horizScrollOffset();
 628
 629         caret_->update(point.x_, point.y_, h, l_shape, isrtl, completable);
 630 }
 631
 632
 633 void GuiWorkArea::Private::showCaret()
 634 {
 635         if (caret_visible_)
 636                 return;
 637
 638         updateCaretGeometry();
 639         p->viewport()->update(caret_->rect());
 640 }
 641
 642
 643 void GuiWorkArea::Private::hideCaret()
 644 {
 645         if (!caret_visible_)
 646                 return;
 647
 648         caret_visible_ = false;
 649         //if (!qApp->focusWidget())
 650                 p->viewport()->update(caret_->rect());
 651 }
 652
 653
 654 void GuiWorkArea::Private::updateScrollbar()
 655 {
 656         // Prevent setRange() and setSliderPosition from causing recursive calls via
 657         // the signal valueChanged. (#10311)
 658         QObject::disconnect(p->verticalScrollBar(), SIGNAL(valueChanged(int)),
 659                             p, SLOT(scrollTo(int)));
 660         ScrollbarParameters const & scroll_ = buffer_view_->scrollbarParameters();
 661         p->verticalScrollBar()->setRange(scroll_.min, scroll_.max);
 662         p->verticalScrollBar()->setPageStep(scroll_.page_step);
 663         p->verticalScrollBar()->setSingleStep(scroll_.single_step);
 664         p->verticalScrollBar()->setSliderPosition(0);
 665         // Connect to the vertical scroll bar
 666         QObject::connect(p->verticalScrollBar(), SIGNAL(valueChanged(int)),
 667                          p, SLOT(scrollTo(int)));
 668 }
 669
 670
 671 void GuiWorkArea::scrollTo(int value)
 672 {
 673         stopBlinkingCaret();
 674         d->buffer_view_->scrollDocView(value, true);
 675
 676         if (lyxrc.cursor_follows_scrollbar) {
 677                 d->buffer_view_->setCursorFromScrollbar();
 678                 // FIXME: let GuiView take care of those.
 679                 d->lyx_view_->updateLayoutList();
 680         }
 681         // Show the caret immediately after any operation.
 682         startBlinkingCaret();
 683         // FIXME QT5
 684 #ifdef Q_WS_X11
 685         QApplication::syncX();
 686 #endif
 687 }
 688
 689
 690 bool GuiWorkArea::event(QEvent * e)
 691 {
 692         switch (e->type()) {
 693         case QEvent::ToolTip: {
 694                 QHelpEvent * helpEvent = static_cast<QHelpEvent *>(e);
 695                 if (lyxrc.use_tooltip) {
 696                         QPoint pos = helpEvent->pos();
 697                         if (pos.x() < viewport()->width()) {
 698                                 QString s = toqstr(d->buffer_view_->toolTip(pos.x(), pos.y()));
 699                                 QToolTip::showText(helpEvent->globalPos(), formatToolTip(s,35));
 700                         }
 701                         else
 702                                 QToolTip::hideText();
 703                 }
 704                 // Don't forget to accept the event!
 705                 e->accept();
 706                 return true;
 707         }
 708
 709         case QEvent::ShortcutOverride:
 710                 // keyPressEvent is ShortcutOverride-aware and only accepts the event in
 711                 // this case
 712                 keyPressEvent(static_cast<QKeyEvent *>(e));
 713                 return e->isAccepted();
 714
 715         case QEvent::KeyPress: {
 716                 // We catch this event in order to catch the Tab or Shift+Tab key press
 717                 // which are otherwise reserved to focus switching between controls
 718                 // within a dialog.
 719                 QKeyEvent * ke = static_cast<QKeyEvent*>(e);
 720                 if ((ke->key() == Qt::Key_Tab && ke->modifiers() == Qt::NoModifier)
 721                         || (ke->key() == Qt::Key_Backtab && (
 722                                 ke->modifiers() == Qt::ShiftModifier
 723                                 || ke->modifiers() == Qt::NoModifier))) {
 724                         keyPressEvent(ke);
 725                         return true;
 726                 }
 727                 return QAbstractScrollArea::event(e);
 728         }
 729
 730         default:
 731                 return QAbstractScrollArea::event(e);
 732         }
 733         return false;
 734 }
 735
 736
 737 void GuiWorkArea::contextMenuEvent(QContextMenuEvent * e)
 738 {
 739         string name;
 740         if (e->reason() == QContextMenuEvent::Mouse)
 741                 // the menu name is set on mouse press
 742                 name = d->context_menu_name_;
 743         else {
 744                 QPoint pos = e->pos();
 745                 Cursor const & cur = d->buffer_view_->cursor();
 746                 if (e->reason() == QContextMenuEvent::Keyboard && cur.inTexted()) {
 747                         // Do not access the context menu of math right in front of before
 748                         // the cursor. This does not work when the cursor is in text.
 749                         Inset * inset = cur.paragraph().getInset(cur.pos());
 750                         if (inset && inset->asInsetMath())
 751                                 --pos.rx();
 752                         else if (cur.pos() > 0) {
 753                                 Inset * inset = cur.paragraph().getInset(cur.pos() - 1);
 754                                 if (inset)
 755                                         ++pos.rx();
 756                         }
 757                 }
 758                 name = d->buffer_view_->contextMenu(pos.x(), pos.y());
 759         }
 760
 761         if (name.empty()) {
 762                 e->accept();
 763                 return;
 764         }
 765         // always show mnemonics when the keyboard is used to show the context menu
 766         // FIXME: This should be fixed in Qt itself
 767         bool const keyboard = (e->reason() == QContextMenuEvent::Keyboard);
 768         QMenu * menu = guiApp->menus().menu(toqstr(name), *d->lyx_view_, keyboard);
 769         if (!menu) {
 770                 e->accept();
 771                 return;
 772         }
 773         // Position the menu to the right.
 774         // FIXME: menu position should be different for RTL text.
 775         menu->exec(e->globalPos());
 776         e->accept();
 777 }
 778
 779
 780 void GuiWorkArea::focusInEvent(QFocusEvent * e)
 781 {
 782         LYXERR(Debug::DEBUG, "GuiWorkArea::focusInEvent(): " << this << endl);
 783         if (d->lyx_view_->currentWorkArea() != this) {
 784                 d->lyx_view_->setCurrentWorkArea(this);
 785                 d->lyx_view_->currentWorkArea()->bufferView().buffer().updateBuffer();
 786         }
 787
 788         startBlinkingCaret();
 789         QAbstractScrollArea::focusInEvent(e);
 790 }
 791
 792
 793 void GuiWorkArea::focusOutEvent(QFocusEvent * e)
 794 {
 795         LYXERR(Debug::DEBUG, "GuiWorkArea::focusOutEvent(): " << this << endl);
 796         stopBlinkingCaret();
 797         QAbstractScrollArea::focusOutEvent(e);
 798 }
 799
 800
 801 void GuiWorkArea::mousePressEvent(QMouseEvent * e)
 802 {
 803         if (d->dc_event_.active && d->dc_event_ == *e) {
 804                 d->dc_event_.active = false;
 805                 FuncRequest cmd(LFUN_MOUSE_TRIPLE, e->x(), e->y(),
 806                         q_button_state(e->button()), q_key_state(e->modifiers()));
 807                 d->dispatch(cmd);
 808                 e->accept();
 809                 return;
 810         }
 811
 812 #if (QT_VERSION < 0x050000) && !defined(__HAIKU__)
 813         inputContext()->reset();
 814 #endif
 815
 816         FuncRequest const cmd(LFUN_MOUSE_PRESS, e->x(), e->y(),
 817                         q_button_state(e->button()), q_key_state(e->modifiers()));
 818         d->dispatch(cmd);
 819
 820         // Save the context menu on mouse press, because also the mouse
 821         // cursor is set on mouse press. Afterwards, we can either release
 822         // the mousebutton somewhere else, or the cursor might have moved
 823         // due to the DEPM. We need to do this after the mouse has been
 824         // set in dispatch(), because the selection state might change.
 825         if (e->button() == Qt::RightButton)
 826                 d->context_menu_name_ = d->buffer_view_->contextMenu(e->x(), e->y());
 827
 828         e->accept();
 829 }
 830
 831
 832 void GuiWorkArea::mouseReleaseEvent(QMouseEvent * e)
 833 {
 834         if (d->synthetic_mouse_event_.timeout.running())
 835                 d->synthetic_mouse_event_.timeout.stop();
 836
 837         FuncRequest const cmd(LFUN_MOUSE_RELEASE, e->x(), e->y(),
 838                         q_button_state(e->button()), q_key_state(e->modifiers()));
 839         d->dispatch(cmd);
 840         e->accept();
 841 }
 842
 843
 844 void GuiWorkArea::mouseMoveEvent(QMouseEvent * e)
 845 {
 846         // we kill the triple click if we move
 847         doubleClickTimeout();
 848         FuncRequest cmd(LFUN_MOUSE_MOTION, e->x(), e->y(),
 849                         q_motion_state(e->buttons()), q_key_state(e->modifiers()));
 850
 851         e->accept();
 852
 853         // If we're above or below the work area...
 854         if ((e->y() <= 20 || e->y() >= viewport()->height() - 20)
 855                         && e->buttons() == mouse_button::button1) {
 856                 // Make sure only a synthetic event can cause a page scroll,
 857                 // so they come at a steady rate:
 858                 if (e->y() <= 20)
 859                         // _Force_ a scroll up:
 860                         cmd.set_y(e->y() - 21);
 861                 else
 862                         cmd.set_y(e->y() + 21);
 863                 // Store the event, to be handled when the timeout expires.
 864                 d->synthetic_mouse_event_.cmd = cmd;
 865
 866                 if (d->synthetic_mouse_event_.timeout.running()) {
 867                         // Discard the event. Note that it _may_ be handled
 868                         // when the timeout expires if
 869                         // synthetic_mouse_event_.cmd has not been overwritten.
 870                         // Ie, when the timeout expires, we handle the
 871                         // most recent event but discard all others that
 872                         // occurred after the one used to start the timeout
 873                         // in the first place.
 874                         return;
 875                 }
 876
 877                 d->synthetic_mouse_event_.restart_timeout = true;
 878                 d->synthetic_mouse_event_.timeout.start();
 879                 // Fall through to handle this event...
 880
 881         } else if (d->synthetic_mouse_event_.timeout.running()) {
 882                 // Store the event, to be possibly handled when the timeout
 883                 // expires.
 884                 // Once the timeout has expired, normal control is returned
 885                 // to mouseMoveEvent (restart_timeout = false).
 886                 // This results in a much smoother 'feel' when moving the
 887                 // mouse back into the work area.
 888                 d->synthetic_mouse_event_.cmd = cmd;
 889                 d->synthetic_mouse_event_.restart_timeout = false;
 890                 return;
 891         }
 892         d->dispatch(cmd);
 893 }
 894
 895
 896 void GuiWorkArea::wheelEvent(QWheelEvent * ev)
 897 {
 898         // Wheel rotation by one notch results in a delta() of 120 (see
 899         // documentation of QWheelEvent)
 900         double const delta = ev->delta() / 120.0;
 901         bool zoom = false;
 902         switch (lyxrc.scroll_wheel_zoom) {
 903         case LyXRC::SCROLL_WHEEL_ZOOM_CTRL:
 904                 zoom = ev->modifiers() & Qt::ControlModifier;
 905                 zoom &= !(ev->modifiers() & (Qt::ShiftModifier | Qt::AltModifier));
 906                 break;
 907         case LyXRC::SCROLL_WHEEL_ZOOM_SHIFT:
 908                 zoom = ev->modifiers() & Qt::ShiftModifier;
 909                 zoom &= !(ev->modifiers() & (Qt::ControlModifier | Qt::AltModifier));
 910                 break;
 911         case LyXRC::SCROLL_WHEEL_ZOOM_ALT:
 912                 zoom = ev->modifiers() & Qt::AltModifier;
 913                 zoom &= !(ev->modifiers() & (Qt::ShiftModifier | Qt::ControlModifier));
 914                 break;
 915         case LyXRC::SCROLL_WHEEL_ZOOM_OFF:
 916                 break;
 917         }
 918         if (zoom) {
 919                 docstring arg = convert<docstring>(int(5 * delta));
 920                 lyx::dispatch(FuncRequest(LFUN_BUFFER_ZOOM_IN, arg));
 921                 return;
 922         }
 923
 924         // Take into account the desktop wide settings.
 925         int const lines = qApp->wheelScrollLines();
 926         int const page_step = verticalScrollBar()->pageStep();
 927         // Test if the wheel mouse is set to one screen at a time.
 928         // This is according to
 929         // https://doc.qt.io/qt-5/qapplication.html#wheelScrollLines-prop
 930         int scroll_value =
 931                 min(lines * verticalScrollBar()->singleStep(), page_step);
 932
 933         // Take into account the rotation and the user preferences.
 934         scroll_value = int(scroll_value * delta * lyxrc.mouse_wheel_speed);
 935         LYXERR(Debug::SCROLLING, "wheelScrollLines = " << lines
 936                         << " delta = " << delta << " scroll_value = " << scroll_value
 937                         << " page_step = " << page_step);
 938         // Now scroll.
 939         verticalScrollBar()->setValue(verticalScrollBar()->value() - scroll_value);
 940
 941         ev->accept();
 942 }
 943
 944
 945 void GuiWorkArea::generateSyntheticMouseEvent()
 946 {
 947         int const e_y = d->synthetic_mouse_event_.cmd.y();
 948         int const wh = d->buffer_view_->workHeight();
 949         bool const up = e_y < 0;
 950         bool const down = e_y > wh;
 951
 952         // Set things off to generate the _next_ 'pseudo' event.
 953         int step = 50;
 954         if (d->synthetic_mouse_event_.restart_timeout) {
 955                 // This is some magic formulae to determine the speed
 956                 // of scrolling related to the position of the mouse.
 957                 int time = 200;
 958                 if (up || down) {
 959                         int dist = up ? -e_y : e_y - wh;
 960                         time = max(min(200, 250000 / (dist * dist)), 1) ;
 961
 962                         if (time < 40) {
 963                                 step = 80000 / (time * time);
 964                                 time = 40;
 965                         }
 966                 }
 967                 d->synthetic_mouse_event_.timeout.setTimeout(time);
 968                 d->synthetic_mouse_event_.timeout.start();
 969         }
 970
 971         // Can we scroll further ?
 972         int const value = verticalScrollBar()->value();
 973         if (value == verticalScrollBar()->maximum()
 974                   || value == verticalScrollBar()->minimum()) {
 975                 d->synthetic_mouse_event_.timeout.stop();
 976                 return;
 977         }
 978
 979         // Scroll
 980         if (step <= 2 * wh) {
 981                 d->buffer_view_->scroll(up ? -step : step);
 982                 d->buffer_view_->updateMetrics();
 983         } else {
 984                 d->buffer_view_->scrollDocView(value + (up ? -step : step), false);
 985         }
 986
 987         // In which paragraph do we have to set the cursor ?
 988         Cursor & cur = d->buffer_view_->cursor();
 989         // FIXME: we don't know how to handle math.
 990         Text * text = cur.text();
 991         if (!text)
 992                 return;
 993         TextMetrics const & tm = d->buffer_view_->textMetrics(text);
 994
 995         // Quit gracefully if there are no metrics, since otherwise next
 996         // line would crash (bug #10324).
 997         // This situation seems related to a (not yet understood) timing problem.
 998         if (tm.empty())
 999                 return;
1000
1001         pair<pit_type, const ParagraphMetrics *> pp = up ? tm.first() : tm.last();
1002         ParagraphMetrics const & pm = *pp.second;
1003         pit_type const pit = pp.first;
1004
1005         if (pm.rows().empty())
1006                 return;
1007
1008         // Find the row at which we set the cursor.
1009         RowList::const_iterator rit = pm.rows().begin();
1010         RowList::const_iterator rlast = pm.rows().end();
1011         int yy = pm.position() - pm.ascent();
1012         for (--rlast; rit != rlast; ++rit) {
1013                 int h = rit->height();
1014                 if ((up && yy + h > 0)
1015                           || (!up && yy + h > wh - defaultRowHeight()))
1016                         break;
1017                 yy += h;
1018         }
1019
1020         // Find the position of the cursor
1021         bool bound;
1022         int x = d->synthetic_mouse_event_.cmd.x();
1023         pos_type const pos = tm.getPosNearX(*rit, x, bound);
1024
1025         // Set the cursor
1026         cur.pit() = pit;
1027         cur.pos() = pos;
1028         cur.boundary(bound);
1029
1030         d->buffer_view_->buffer().changed(false);
1031         return;
1032 }
1033
1034
1035 // CompressorProxy adapted from Kuba Ober https://stackoverflow.com/a/21006207
1036 CompressorProxy::CompressorProxy(GuiWorkArea * wa) : QObject(wa), flag_(false)
1037 {
1038         qRegisterMetaType<KeySymbol>("KeySymbol");
1039         qRegisterMetaType<KeyModifier>("KeyModifier");
1040         connect(wa, SIGNAL(compressKeySym(KeySymbol, KeyModifier, bool)),
1041                 this, SLOT(slot(KeySymbol, KeyModifier, bool)),
1042                 Qt::QueuedConnection);
1043         connect(this, SIGNAL(signal(KeySymbol, KeyModifier)),
1044                 wa, SLOT(processKeySym(KeySymbol, KeyModifier)));
1045 }
1046
1047
1048 bool CompressorProxy::emitCheck(bool isAutoRepeat)
1049 {
1050         flag_ = true;
1051         if (isAutoRepeat)
1052                 QCoreApplication::sendPostedEvents(this, QEvent::MetaCall); // recurse
1053         bool result = flag_;
1054         flag_ = false;
1055         return result;
1056 }
1057
1058
1059 void CompressorProxy::slot(KeySymbol sym, KeyModifier mod, bool isAutoRepeat)
1060 {
1061         if (emitCheck(isAutoRepeat))
1062                 Q_EMIT signal(sym, mod);
1063         else
1064                 LYXERR(Debug::KEY, "system is busy: autoRepeat key event ignored");
1065 }
1066
1067
1068 void GuiWorkArea::keyPressEvent(QKeyEvent * ev)
1069 {
1070         // this is also called for ShortcutOverride events. In this case, one must
1071         // not act but simply accept the event explicitly.
1072         bool const act = (ev->type() != QEvent::ShortcutOverride);
1073
1074         // Do not process here some keys if dialog_mode_ is set
1075         bool const for_dialog_mode = d->dialog_mode_
1076                 && (ev->modifiers() == Qt::NoModifier
1077                     || ev->modifiers() == Qt::ShiftModifier)
1078                 && (ev->key() == Qt::Key_Escape
1079                     || ev->key() == Qt::Key_Enter
1080                     || ev->key() == Qt::Key_Return);
1081         // also do not use autoRepeat to input shortcuts
1082         bool const autoRepeat = ev->isAutoRepeat();
1083
1084         if (for_dialog_mode || (!act && autoRepeat)) {
1085                 ev->ignore();
1086                 return;
1087         }
1088
1089         // intercept some keys if completion popup is visible
1090         if (d->completer_->popupVisible()) {
1091                 switch (ev->key()) {
1092                 case Qt::Key_Enter:
1093                 case Qt::Key_Return:
1094                         if (act)
1095                                 d->completer_->activate();
1096                         ev->accept();
1097                         return;
1098                 }
1099         }
1100
1101         KeyModifier const m = q_key_state(ev->modifiers());
1102
1103         if (act && lyxerr.debugging(Debug::KEY)) {
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                 LYXERR(Debug::KEY, " count: " << ev->count() << " text: " << ev->text()
1114                        << " isAutoRepeat: " << ev->isAutoRepeat() << " key: " << ev->key()
1115                        << " keyState: " << str);
1116         }
1117
1118         KeySymbol sym;
1119         setKeySymbol(&sym, ev);
1120         if (sym.isOK()) {
1121                 if (act) {
1122                         Q_EMIT compressKeySym(sym, m, autoRepeat);
1123                         ev->accept();
1124                 } else
1125                         // here, !autoRepeat, as determined at the beginning
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::Private::paintPreeditText(GuiPainter & pain)
1160 {
1161         if (preedit_string_.empty())
1162                 return;
1163
1164         // FIXME: shall we use real_current_font here? (see #10478)
1165         FontInfo const font = buffer_view_->cursor().getFont().fontInfo();
1166         FontMetrics const & fm = theFontMetrics(font);
1167         int const height = fm.maxHeight();
1168         int cur_x = caret_->rect().left();
1169         int cur_y = caret_->rect().bottom();
1170
1171         // get attributes of input method cursor.
1172         // cursor_pos : cursor position in preedit string.
1173         size_t cursor_pos = 0;
1174         bool cursor_is_visible = false;
1175         for (auto const & attr : preedit_attr_) {
1176                 if (attr.type == QInputMethodEvent::Cursor) {
1177                         cursor_pos = attr.start;
1178                         cursor_is_visible = attr.length != 0;
1179                         break;
1180                 }
1181         }
1182
1183         size_t const preedit_length = preedit_string_.length();
1184
1185         // get position of selection in input method.
1186         // FIXME: isn't there a way to do this simplier?
1187         // rStart : cursor position in selected string in IM.
1188         size_t rStart = 0;
1189         // rLength : selected string length in IM.
1190         size_t rLength = 0;
1191         if (cursor_pos < preedit_length) {
1192                 for (auto const & attr : preedit_attr_) {
1193                         if (attr.type == QInputMethodEvent::TextFormat) {
1194                                 if (attr.start <= int(cursor_pos)
1195                                         && int(cursor_pos) < attr.start + attr.length) {
1196                                                 rStart = attr.start;
1197                                                 rLength = attr.length;
1198                                                 if (!cursor_is_visible)
1199                                                         cursor_pos += rLength;
1200                                                 break;
1201                                 }
1202                         }
1203                 }
1204         }
1205         else {
1206                 rStart = cursor_pos;
1207                 rLength = 0;
1208         }
1209
1210         int const right_margin = buffer_view_->rightMargin();
1211         Painter::preedit_style ps;
1212         // Most often there would be only one line:
1213         preedit_lines_ = 1;
1214         for (size_t pos = 0; pos != preedit_length; ++pos) {
1215                 char_type const typed_char = preedit_string_[pos];
1216                 // reset preedit string style
1217                 ps = Painter::preedit_default;
1218
1219                 // if we reached the right extremity of the screen, go to next line.
1220                 if (cur_x + fm.width(typed_char) > p->viewport()->width() - right_margin) {
1221                         cur_x = right_margin;
1222                         cur_y += height + 1;
1223                         ++preedit_lines_;
1224                 }
1225                 // preedit strings are displayed with dashed underline
1226                 // and partial strings are displayed white on black indicating
1227                 // that we are in selecting mode in the input method.
1228                 // FIXME: rLength == preedit_length is not a changing condition
1229                 // FIXME: should be put out of the loop.
1230                 if (pos >= rStart
1231                         && pos < rStart + rLength
1232                         && !(cursor_pos < rLength && rLength == preedit_length))
1233                         ps = Painter::preedit_selecting;
1234
1235                 if (pos == cursor_pos
1236                         && (cursor_pos < rLength && rLength == preedit_length))
1237                         ps = Painter::preedit_cursor;
1238
1239                 // draw one character and update cur_x.
1240                 cur_x += pain.preeditText(cur_x, cur_y, typed_char, font, ps);
1241         }
1242 }
1243
1244
1245 void GuiWorkArea::paintEvent(QPaintEvent * ev)
1246 {
1247         // Do not trigger the painting machinery if we are not ready (see
1248         // bug #10989). The second test triggers when in the middle of a
1249         // dispatch operation.
1250         if (view().busy() || d->buffer_view_->buffer().undo().activeUndoGroup()) {
1251                 // Since macOS has turned the screen black at this point, our
1252                 // backing store has to be copied to screen (this is a no-op
1253                 // except on macOS).
1254                 d->updateScreen(ev->rect());
1255                 ev->accept();
1256                 return;
1257         }
1258
1259         // LYXERR(Debug::PAINTING, "paintEvent begin: x: " << rc.x()
1260         //      << " y: " << rc.y() << " w: " << rc.width() << " h: " << rc.height());
1261
1262         if (d->need_resize_ || pixelRatio() != d->last_pixel_ratio_) {
1263                 d->resetScreen();
1264                 d->resizeBufferView();
1265         }
1266
1267         d->last_pixel_ratio_ = pixelRatio();
1268
1269         GuiPainter pain(d->screenDevice(), pixelRatio());
1270
1271         d->buffer_view_->draw(pain, d->caret_visible_);
1272
1273         // The preedit text, if needed
1274         d->paintPreeditText(pain);
1275
1276         // and the caret
1277         if (d->caret_visible_)
1278                 d->caret_->draw(pain);
1279
1280         d->updateScreen(ev->rect());
1281
1282         ev->accept();
1283 }
1284
1285
1286 void GuiWorkArea::inputMethodEvent(QInputMethodEvent * e)
1287 {
1288         LYXERR(Debug::KEY, "preeditString: " << e->preeditString()
1289                    << " commitString: " << e->commitString());
1290
1291         // insert the processed text in the document (handles undo)
1292         if (!e->commitString().isEmpty()) {
1293                 d->buffer_view_->cursor().beginUndoGroup();
1294                 d->buffer_view_->cursor().insert(qstring_to_ucs4(e->commitString()));
1295                 d->buffer_view_->updateMetrics();
1296                 d->buffer_view_->cursor().endUndoGroup();
1297                 d->updateCaretGeometry();
1298                 viewport()->update();
1299         }
1300
1301         // Hide the caret during the test transformation.
1302         if (e->preeditString().isEmpty())
1303                 startBlinkingCaret();
1304         else
1305                 stopBlinkingCaret();
1306
1307         if (d->preedit_string_.empty() && e->preeditString().isEmpty()) {
1308                 // Nothing to do
1309                 e->accept();
1310                 return;
1311         }
1312
1313         // The preedit text and its attributes will be used in paintPreeditText
1314         d->preedit_string_ = qstring_to_ucs4(e->preeditString());
1315         d->preedit_attr_ = e->attributes();
1316
1317
1318         // redraw area of preedit string.
1319         int height = d->caret_->rect().height();
1320         int cur_y = d->caret_->rect().bottom();
1321         viewport()->update(0, cur_y - height, viewport()->width(),
1322                 (height + 1) * d->preedit_lines_);
1323
1324         if (d->preedit_string_.empty()) {
1325                 d->preedit_lines_ = 1;
1326                 e->accept();
1327                 return;
1328         }
1329
1330         // Don't forget to accept the event!
1331         e->accept();
1332 }
1333
1334
1335 QVariant GuiWorkArea::inputMethodQuery(Qt::InputMethodQuery query) const
1336 {
1337         QRect cur_r(0, 0, 0, 0);
1338         switch (query) {
1339                 // this is the CJK-specific composition window position and
1340                 // the context menu position when the menu key is pressed.
1341                 case Qt::ImMicroFocus:
1342                         cur_r = d->caret_->rect();
1343                         if (d->preedit_lines_ != 1)
1344                                 cur_r.moveLeft(10);
1345                         cur_r.moveBottom(cur_r.bottom()
1346                                 + cur_r.height() * (d->preedit_lines_ - 1));
1347                         // return lower right of caret in LyX.
1348                         return cur_r;
1349                 default:
1350                         return QWidget::inputMethodQuery(query);
1351         }
1352 }
1353
1354
1355 void GuiWorkArea::updateWindowTitle()
1356 {
1357         Buffer const & buf = bufferView().buffer();
1358         if (buf.fileName() != d->file_name_
1359             || buf.params().shell_escape != d->shell_escape_
1360             || buf.hasReadonlyFlag() != d->read_only_
1361             || buf.lyxvc().vcstatus() != d->vc_status_
1362             || buf.isClean() != d->clean_
1363             || buf.notifiesExternalModification() != d->externally_modified_) {
1364                 d->file_name_ = buf.fileName();
1365                 d->shell_escape_ = buf.params().shell_escape;
1366                 d->read_only_ = buf.hasReadonlyFlag();
1367                 d->vc_status_ = buf.lyxvc().vcstatus();
1368                 d->clean_ = buf.isClean();
1369                 d->externally_modified_ = buf.notifiesExternalModification();
1370                 Q_EMIT titleChanged(this);
1371         }
1372 }
1373
1374
1375 bool GuiWorkArea::isFullScreen() const
1376 {
1377         return d->lyx_view_ && d->lyx_view_->isFullScreen();
1378 }
1379
1380
1381 bool GuiWorkArea::inDialogMode() const
1382 {
1383         return d->dialog_mode_;
1384 }
1385
1386
1387 void GuiWorkArea::setDialogMode(bool mode)
1388 {
1389         d->dialog_mode_ = mode;
1390 }
1391
1392
1393 GuiCompleter & GuiWorkArea::completer()
1394 {
1395         return *d->completer_;
1396 }
1397
1398 GuiView const & GuiWorkArea::view() const
1399 {
1400         return *d->lyx_view_;
1401 }
1402
1403
1404 GuiView & GuiWorkArea::view()
1405 {
1406         return *d->lyx_view_;
1407 }
1408
1409 ////////////////////////////////////////////////////////////////////
1410 //
1411 // EmbeddedWorkArea
1412 //
1413 ////////////////////////////////////////////////////////////////////
1414
1415
1416 EmbeddedWorkArea::EmbeddedWorkArea(QWidget * w): GuiWorkArea(w)
1417 {
1418         support::TempFile tempfile("embedded.internal");
1419         tempfile.setAutoRemove(false);
1420         buffer_ = theBufferList().newInternalBuffer(tempfile.name().absFileName());
1421         buffer_->setUnnamed(true);
1422         buffer_->setFullyLoaded(true);
1423         setBuffer(*buffer_);
1424         setDialogMode(true);
1425 }
1426
1427
1428 EmbeddedWorkArea::~EmbeddedWorkArea()
1429 {
1430         // No need to destroy buffer and bufferview here, because it is done
1431         // in theBufferList() destruction loop at application exit
1432 }
1433
1434
1435 void EmbeddedWorkArea::closeEvent(QCloseEvent * ev)
1436 {
1437         disable();
1438         GuiWorkArea::closeEvent(ev);
1439 }
1440
1441
1442 void EmbeddedWorkArea::hideEvent(QHideEvent * ev)
1443 {
1444         disable();
1445         GuiWorkArea::hideEvent(ev);
1446 }
1447
1448
1449 QSize EmbeddedWorkArea::sizeHint () const
1450 {
1451         // FIXME(?):
1452         // GuiWorkArea sets the size to the screen's viewport
1453         // by returning a value this gets overridden
1454         // EmbeddedWorkArea is now sized to fit in the layout
1455         // of the parent, and has a minimum size set in GuiWorkArea
1456         // which is what we return here
1457         return QSize(100, 70);
1458 }
1459
1460
1461 void EmbeddedWorkArea::disable()
1462 {
1463         stopBlinkingCaret();
1464         if (view().currentWorkArea() != this)
1465                 return;
1466         // No problem if currentMainWorkArea() is 0 (setCurrentWorkArea()
1467         // tolerates it and shows the background logo), what happens if
1468         // an EmbeddedWorkArea is closed after closing all document WAs
1469         view().setCurrentWorkArea(view().currentMainWorkArea());
1470 }
1471
1472 ////////////////////////////////////////////////////////////////////
1473 //
1474 // TabWorkArea
1475 //
1476 ////////////////////////////////////////////////////////////////////
1477
1478 #ifdef Q_OS_MAC
1479 class NoTabFrameMacStyle : public QProxyStyle {
1480 public:
1481         ///
1482         QRect subElementRect(SubElement element, const QStyleOption * option,
1483                              const QWidget * widget = 0) const
1484         {
1485                 QRect rect = QProxyStyle::subElementRect(element, option, widget);
1486                 bool noBar = static_cast<QTabWidget const *>(widget)->count() <= 1;
1487
1488                 // The Qt Mac style puts the contents into a 3 pixel wide box
1489                 // which looks very ugly and not like other Mac applications.
1490                 // Hence we remove this here, and moreover the 16 pixel round
1491                 // frame above if the tab bar is hidden.
1492                 if (element == QStyle::SE_TabWidgetTabContents) {
1493                         rect.adjust(- rect.left(), 0, rect.left(), 0);
1494                         if (noBar)
1495                                 rect.setTop(0);
1496                 }
1497
1498                 return rect;
1499         }
1500 };
1501
1502 NoTabFrameMacStyle noTabFrameMacStyle;
1503 #endif
1504
1505
1506 TabWorkArea::TabWorkArea(QWidget * parent)
1507         : QTabWidget(parent), clicked_tab_(-1), midpressed_tab_(-1)
1508 {
1509 #ifdef Q_OS_MAC
1510         setStyle(&noTabFrameMacStyle);
1511 #endif
1512
1513         QPalette pal = palette();
1514         pal.setColor(QPalette::Active, QPalette::Button,
1515                 pal.color(QPalette::Active, QPalette::Window));
1516         pal.setColor(QPalette::Disabled, QPalette::Button,
1517                 pal.color(QPalette::Disabled, QPalette::Window));
1518         pal.setColor(QPalette::Inactive, QPalette::Button,
1519                 pal.color(QPalette::Inactive, QPalette::Window));
1520
1521         QObject::connect(this, SIGNAL(currentChanged(int)),
1522                 this, SLOT(on_currentTabChanged(int)));
1523
1524         closeBufferButton = new QToolButton(this);
1525         closeBufferButton->setPalette(pal);
1526         // FIXME: rename the icon to closebuffer.png
1527         closeBufferButton->setIcon(QIcon(getPixmap("images/", "closetab", "svgz,png")));
1528         closeBufferButton->setText("Close File");
1529         closeBufferButton->setAutoRaise(true);
1530         closeBufferButton->setCursor(Qt::ArrowCursor);
1531         closeBufferButton->setToolTip(qt_("Close File"));
1532         closeBufferButton->setEnabled(true);
1533         QObject::connect(closeBufferButton, SIGNAL(clicked()),
1534                 this, SLOT(closeCurrentBuffer()));
1535         setCornerWidget(closeBufferButton, Qt::TopRightCorner);
1536
1537         // setup drag'n'drop
1538         QTabBar* tb = new DragTabBar;
1539         connect(tb, SIGNAL(tabMoveRequested(int, int)),
1540                 this, SLOT(moveTab(int, int)));
1541         tb->setElideMode(Qt::ElideNone);
1542         setTabBar(tb);
1543
1544         // make us responsible for the context menu of the tabbar
1545         tb->setContextMenuPolicy(Qt::CustomContextMenu);
1546         connect(tb, SIGNAL(customContextMenuRequested(const QPoint &)),
1547                 this, SLOT(showContextMenu(const QPoint &)));
1548         connect(tb, SIGNAL(tabCloseRequested(int)),
1549                 this, SLOT(closeTab(int)));
1550
1551         setUsesScrollButtons(true);
1552 }
1553
1554
1555 void TabWorkArea::mousePressEvent(QMouseEvent *me)
1556 {
1557         if (me->button() == Qt::MidButton)
1558                 midpressed_tab_ = tabBar()->tabAt(me->pos());
1559         else
1560                 QTabWidget::mousePressEvent(me);
1561 }
1562
1563
1564 void TabWorkArea::mouseReleaseEvent(QMouseEvent *me)
1565 {
1566         if (me->button() == Qt::MidButton) {
1567                 int const midreleased_tab = tabBar()->tabAt(me->pos());
1568                 if (midpressed_tab_ == midreleased_tab && posIsTab(me->pos()))
1569                         closeTab(midreleased_tab);
1570         } else
1571                 QTabWidget::mouseReleaseEvent(me);
1572 }
1573
1574
1575 void TabWorkArea::paintEvent(QPaintEvent * event)
1576 {
1577         if (tabBar()->isVisible()) {
1578                 QTabWidget::paintEvent(event);
1579         } else {
1580                 // Prevent the selected tab to influence the
1581                 // painting of the frame of the tab widget.
1582                 // This is needed for gtk style in Qt.
1583                 QStylePainter p(this);
1584 #if QT_VERSION < 0x050000
1585                 QStyleOptionTabWidgetFrameV2 opt;
1586 #else
1587                 QStyleOptionTabWidgetFrame opt;
1588 #endif
1589                 initStyleOption(&opt);
1590                 opt.rect = style()->subElementRect(QStyle::SE_TabWidgetTabPane,
1591                         &opt, this);
1592                 opt.selectedTabRect = QRect();
1593                 p.drawPrimitive(QStyle::PE_FrameTabWidget, opt);
1594         }
1595 }
1596
1597
1598 bool TabWorkArea::posIsTab(QPoint position)
1599 {
1600         // tabAt returns -1 if tab does not covers position
1601         return tabBar()->tabAt(position) > -1;
1602 }
1603
1604
1605 void TabWorkArea::mouseDoubleClickEvent(QMouseEvent * event)
1606 {
1607         if (event->button() != Qt::LeftButton)
1608                 return;
1609
1610         // this code chunk is unnecessary because it seems the event only makes
1611         // it this far if it is not on a tab. I'm not sure why this is (maybe
1612         // it is handled and ended in DragTabBar?), and thus I'm not sure if
1613         // this is true in all cases and if it will be true in the future so I
1614         // leave this code for now. (skostysh, 2016-07-21)
1615         //
1616         // return early if double click on existing tabs
1617         if (posIsTab(event->pos()))
1618                 return;
1619
1620         dispatch(FuncRequest(LFUN_BUFFER_NEW));
1621 }
1622
1623
1624 void TabWorkArea::setFullScreen(bool full_screen)
1625 {
1626         for (int i = 0; i != count(); ++i) {
1627                 if (GuiWorkArea * wa = workArea(i))
1628                         wa->setFullScreen(full_screen);
1629         }
1630
1631         if (lyxrc.full_screen_tabbar)
1632                 showBar(!full_screen && count() > 1);
1633         else
1634                 showBar(count() > 1);
1635 }
1636
1637
1638 void TabWorkArea::showBar(bool show)
1639 {
1640         tabBar()->setEnabled(show);
1641         tabBar()->setVisible(show);
1642         closeBufferButton->setVisible(show && lyxrc.single_close_tab_button);
1643         setTabsClosable(!lyxrc.single_close_tab_button);
1644 }
1645
1646
1647 GuiWorkAreaContainer * TabWorkArea::widget(int index) const
1648 {
1649         QWidget * w = QTabWidget::widget(index);
1650         if (!w)
1651                 return nullptr;
1652         GuiWorkAreaContainer * wac = dynamic_cast<GuiWorkAreaContainer *>(w);
1653         LATTEST(wac);
1654         return wac;
1655 }
1656
1657
1658 GuiWorkAreaContainer * TabWorkArea::currentWidget() const
1659 {
1660         return widget(currentIndex());
1661 }
1662
1663
1664 GuiWorkArea * TabWorkArea::workArea(int index) const
1665 {
1666         GuiWorkAreaContainer * w = widget(index);
1667         if (!w)
1668                 return nullptr;
1669         return w->workArea();
1670 }
1671
1672
1673 GuiWorkArea * TabWorkArea::currentWorkArea() const
1674 {
1675         return workArea(currentIndex());
1676 }
1677
1678
1679 GuiWorkArea * TabWorkArea::workArea(Buffer & buffer) const
1680 {
1681         // FIXME: this method doesn't work if we have more than one work area
1682         // showing the same buffer.
1683         for (int i = 0; i != count(); ++i) {
1684                 GuiWorkArea * wa = workArea(i);
1685                 LASSERT(wa, return 0);
1686                 if (&wa->bufferView().buffer() == &buffer)
1687                         return wa;
1688         }
1689         return 0;
1690 }
1691
1692
1693 void TabWorkArea::closeAll()
1694 {
1695         while (count()) {
1696                 QWidget * wac = widget(0);
1697                 LASSERT(wac, return);
1698                 removeTab(0);
1699                 delete wac;
1700         }
1701 }
1702
1703
1704 int TabWorkArea::indexOfWorkArea(GuiWorkArea * w) const
1705 {
1706         for (int index = 0; index < count(); ++index)
1707                 if (workArea(index) == w)
1708                         return index;
1709         return -1;
1710 }
1711
1712
1713 bool TabWorkArea::setCurrentWorkArea(GuiWorkArea * work_area)
1714 {
1715         LASSERT(work_area, return false);
1716         int index = indexOfWorkArea(work_area);
1717         if (index == -1)
1718                 return false;
1719
1720         if (index == currentIndex())
1721                 // Make sure the work area is up to date.
1722                 on_currentTabChanged(index);
1723         else
1724                 // Switch to the work area.
1725                 setCurrentIndex(index);
1726         work_area->setFocus();
1727
1728         return true;
1729 }
1730
1731
1732 GuiWorkArea * TabWorkArea::addWorkArea(Buffer & buffer, GuiView & view)
1733 {
1734         GuiWorkArea * wa = new GuiWorkArea(buffer, view);
1735         GuiWorkAreaContainer * wac = new GuiWorkAreaContainer(wa);
1736         wa->setUpdatesEnabled(false);
1737         // Hide tabbar if there's no tab (avoid a resize and a flashing tabbar
1738         // when hiding it again below).
1739         if (!(currentWorkArea() && currentWorkArea()->isFullScreen()))
1740                 showBar(count() > 0);
1741         addTab(wac, wa->windowTitle());
1742         QObject::connect(wa, SIGNAL(titleChanged(GuiWorkArea *)),
1743                 this, SLOT(updateTabTexts()));
1744         if (currentWorkArea() && currentWorkArea()->isFullScreen())
1745                 setFullScreen(true);
1746         else
1747                 // Hide tabbar if there's only one tab.
1748                 showBar(count() > 1);
1749
1750         updateTabTexts();
1751
1752         return wa;
1753 }
1754
1755
1756 bool TabWorkArea::removeWorkArea(GuiWorkArea * work_area)
1757 {
1758         LASSERT(work_area, return false);
1759         int index = indexOfWorkArea(work_area);
1760         if (index == -1)
1761                 return false;
1762
1763         work_area->setUpdatesEnabled(false);
1764         QWidget * wac = widget(index);
1765         removeTab(index);
1766         delete wac;
1767
1768         if (count()) {
1769                 // make sure the next work area is enabled.
1770                 currentWidget()->setUpdatesEnabled(true);
1771                 if (currentWorkArea() && currentWorkArea()->isFullScreen())
1772                         setFullScreen(true);
1773                 else
1774                         // Show tabbar only if there's more than one tab.
1775                         showBar(count() > 1);
1776         } else
1777                 lastWorkAreaRemoved();
1778
1779         updateTabTexts();
1780
1781         return true;
1782 }
1783
1784
1785 void TabWorkArea::on_currentTabChanged(int i)
1786 {
1787         // returns e.g. on application destruction
1788         if (i == -1)
1789                 return;
1790         GuiWorkArea * wa = workArea(i);
1791         LASSERT(wa, return);
1792         wa->setUpdatesEnabled(true);
1793         wa->scheduleRedraw(true);
1794         wa->setFocus();
1795         ///
1796         currentWorkAreaChanged(wa);
1797
1798         LYXERR(Debug::GUI, "currentTabChanged " << i
1799                 << " File: " << wa->bufferView().buffer().absFileName());
1800 }
1801
1802
1803 void TabWorkArea::closeCurrentBuffer()
1804 {
1805         GuiWorkArea * wa;
1806         if (clicked_tab_ == -1)
1807                 wa = currentWorkArea();
1808         else {
1809                 wa = workArea(clicked_tab_);
1810                 LASSERT(wa, return);
1811         }
1812         wa->view().closeWorkArea(wa);
1813 }
1814
1815
1816 void TabWorkArea::hideCurrentTab()
1817 {
1818         GuiWorkArea * wa;
1819         if (clicked_tab_ == -1)
1820                 wa = currentWorkArea();
1821         else {
1822                 wa = workArea(clicked_tab_);
1823                 LASSERT(wa, return);
1824         }
1825         wa->view().hideWorkArea(wa);
1826 }
1827
1828
1829 void TabWorkArea::closeTab(int index)
1830 {
1831         on_currentTabChanged(index);
1832         GuiWorkArea * wa;
1833         if (index == -1)
1834                 wa = currentWorkArea();
1835         else {
1836                 wa = workArea(index);
1837                 LASSERT(wa, return);
1838         }
1839         wa->view().closeWorkArea(wa);
1840 }
1841
1842
1843 ///
1844 class DisplayPath {
1845 public:
1846         /// make vector happy
1847         DisplayPath() : tab_(-1), dottedPrefix_(false) {}
1848         ///
1849         DisplayPath(int tab, FileName const & filename)
1850                 : tab_(tab)
1851         {
1852                 filename_ = (filename.extension() == "lyx") ?
1853                         toqstr(filename.onlyFileNameWithoutExt())
1854                         : toqstr(filename.onlyFileName());
1855                 postfix_ = toqstr(filename.absoluteFilePath()).
1856                         split("/", QString::SkipEmptyParts);
1857                 postfix_.pop_back();
1858                 abs_ = toqstr(filename.absoluteFilePath());
1859                 dottedPrefix_ = false;
1860         }
1861
1862         /// Absolute path for debugging.
1863         QString abs() const
1864         {
1865                 return abs_;
1866         }
1867         /// Add the first segment from the postfix or three dots to the prefix.
1868         /// Merge multiple dot tripples. In fact dots are added lazily, i.e. only
1869         /// when really needed.
1870         void shiftPathSegment(bool dotted)
1871         {
1872                 if (postfix_.count() <= 0)
1873                         return;
1874
1875                 if (!dotted) {
1876                         if (dottedPrefix_ && !prefix_.isEmpty())
1877                                 prefix_ += ellipsisSlash_;
1878                         prefix_ += postfix_.front() + "/";
1879                 }
1880                 dottedPrefix_ = dotted && !prefix_.isEmpty();
1881                 postfix_.pop_front();
1882         }
1883         ///
1884         QString displayString() const
1885         {
1886                 if (prefix_.isEmpty())
1887                         return filename_;
1888
1889                 bool dots = dottedPrefix_ || !postfix_.isEmpty();
1890                 return prefix_ + (dots ? ellipsisSlash_ : "") + filename_;
1891         }
1892         ///
1893         QString forecastPathString() const
1894         {
1895                 if (postfix_.count() == 0)
1896                         return displayString();
1897
1898                 return prefix_
1899                         + (dottedPrefix_ ? ellipsisSlash_ : "")
1900                         + postfix_.front() + "/";
1901         }
1902         ///
1903         bool final() const { return postfix_.empty(); }
1904         ///
1905         int tab() const { return tab_; }
1906
1907 private:
1908         /// ".../"
1909         static QString const ellipsisSlash_;
1910         ///
1911         QString prefix_;
1912         ///
1913         QStringList postfix_;
1914         ///
1915         QString filename_;
1916         ///
1917         QString abs_;
1918         ///
1919         int tab_;
1920         ///
1921         bool dottedPrefix_;
1922 };
1923
1924
1925 QString const DisplayPath::ellipsisSlash_ = QString(QChar(0x2026)) + "/";
1926
1927
1928 ///
1929 bool operator<(DisplayPath const & a, DisplayPath const & b)
1930 {
1931         return a.displayString() < b.displayString();
1932 }
1933
1934 ///
1935 bool operator==(DisplayPath const & a, DisplayPath const & b)
1936 {
1937         return a.displayString() == b.displayString();
1938 }
1939
1940
1941 void TabWorkArea::updateTabTexts()
1942 {
1943         size_t n = count();
1944         if (n == 0)
1945                 return;
1946         std::list<DisplayPath> paths;
1947         typedef std::list<DisplayPath>::iterator It;
1948
1949         // collect full names first: path into postfix, empty prefix and
1950         // filename without extension
1951         for (size_t i = 0; i < n; ++i) {
1952                 GuiWorkArea * i_wa = workArea(i);
1953                 FileName const fn = i_wa->bufferView().buffer().fileName();
1954                 paths.push_back(DisplayPath(i, fn));
1955         }
1956
1957         // go through path segments and see if it helps to make the path more unique
1958         bool somethingChanged = true;
1959         bool allFinal = false;
1960         while (somethingChanged && !allFinal) {
1961                 // adding path segments changes order
1962                 paths.sort();
1963
1964                 LYXERR(Debug::GUI, "updateTabTexts() iteration start");
1965                 somethingChanged = false;
1966                 allFinal = true;
1967
1968                 // find segments which are not unique (i.e. non-atomic)
1969                 It it = paths.begin();
1970                 It segStart = it;
1971                 QString segString = it->displayString();
1972                 for (; it != paths.end(); ++it) {
1973                         // look to the next item
1974                         It next = it;
1975                         ++next;
1976
1977                         // final?
1978                         allFinal = allFinal && it->final();
1979
1980                         LYXERR(Debug::GUI, "it = " << it->abs()
1981                                << " => " << it->displayString());
1982
1983                         // still the same segment?
1984                         QString nextString;
1985                         if ((next != paths.end()
1986                              && (nextString = next->displayString()) == segString))
1987                                 continue;
1988                         LYXERR(Debug::GUI, "segment ended");
1989
1990                         // only a trivial one with one element?
1991                         if (it == segStart) {
1992                                 // start new segment
1993                                 segStart = next;
1994                                 segString = nextString;
1995                                 continue;
1996                         }
1997
1998                         // We found a non-atomic segment
1999                         // We know that segStart <= it < next <= paths.end().
2000                         // The assertion below tells coverity about it.
2001                         LATTEST(segStart != paths.end());
2002                         QString dspString = segStart->forecastPathString();
2003                         LYXERR(Debug::GUI, "first forecast found for "
2004                                << segStart->abs() << " => " << dspString);
2005                         It sit = segStart;
2006                         ++sit;
2007                         // Shift path segments and hope for the best
2008                         // that it makes the path more unique.
2009                         somethingChanged = true;
2010                         bool moreUnique = false;
2011                         for (; sit != next; ++sit) {
2012                                 if (sit->forecastPathString() != dspString) {
2013                                         LYXERR(Debug::GUI, "different forecast found for "
2014                                                 << sit->abs() << " => " << sit->forecastPathString());
2015                                         moreUnique = true;
2016                                         break;
2017                                 }
2018                                 LYXERR(Debug::GUI, "same forecast found for "
2019                                         << sit->abs() << " => " << dspString);
2020                         }
2021
2022                         // if the path segment helped, add it. Otherwise add dots
2023                         bool dots = !moreUnique;
2024                         LYXERR(Debug::GUI, "using dots = " << dots);
2025                         for (sit = segStart; sit != next; ++sit) {
2026                                 sit->shiftPathSegment(dots);
2027                                 LYXERR(Debug::GUI, "shifting "
2028                                         << sit->abs() << " => " << sit->displayString());
2029                         }
2030
2031                         // start new segment
2032                         segStart = next;
2033                         segString = nextString;
2034                 }
2035         }
2036
2037         // set new tab titles
2038         for (It it = paths.begin(); it != paths.end(); ++it) {
2039                 int const tab_index = it->tab();
2040                 Buffer const & buf = workArea(tab_index)->bufferView().buffer();
2041                 QString tab_text = it->displayString().replace("&", "&&");
2042                 if (!buf.fileName().empty() && !buf.isClean())
2043                         tab_text += "*";
2044                 QString tab_tooltip = it->abs();
2045                 if (buf.hasReadonlyFlag()) {
2046                         setTabIcon(tab_index, QIcon(getPixmap("images/", "emblem-readonly", "svgz,png")));
2047                         tab_tooltip = qt_("%1 (read only)").arg(tab_tooltip);
2048                 } else
2049                         setTabIcon(tab_index, QIcon());
2050                 if (buf.notifiesExternalModification()) {
2051                         QString const warn = qt_("%1 (modified externally)");
2052                         tab_tooltip = warn.arg(tab_tooltip);
2053                         tab_text += QChar(0x26a0);
2054                 }
2055                 setTabText(tab_index, tab_text);
2056                 setTabToolTip(tab_index, tab_tooltip);
2057         }
2058 }
2059
2060
2061 void TabWorkArea::showContextMenu(const QPoint & pos)
2062 {
2063         // which tab?
2064         clicked_tab_ = static_cast<DragTabBar *>(tabBar())->tabAt(pos);
2065         if (clicked_tab_ == -1)
2066                 return;
2067
2068         // show tab popup
2069         QMenu popup;
2070         popup.addAction(QIcon(getPixmap("images/", "hidetab", "svgz,png")),
2071                 qt_("Hide tab"), this, SLOT(hideCurrentTab()));
2072         popup.addAction(QIcon(getPixmap("images/", "closetab", "svgz,png")),
2073                 qt_("Close tab"), this, SLOT(closeCurrentBuffer()));
2074         popup.exec(tabBar()->mapToGlobal(pos));
2075
2076         clicked_tab_ = -1;
2077 }
2078
2079
2080 void TabWorkArea::moveTab(int fromIndex, int toIndex)
2081 {
2082         QWidget * w = widget(fromIndex);
2083         QIcon icon = tabIcon(fromIndex);
2084         QString text = tabText(fromIndex);
2085
2086         setCurrentIndex(fromIndex);
2087         removeTab(fromIndex);
2088         insertTab(toIndex, w, icon, text);
2089         setCurrentIndex(toIndex);
2090 }
2091
2092
2093 DragTabBar::DragTabBar(QWidget* parent)
2094         : QTabBar(parent)
2095 {
2096         setAcceptDrops(true);
2097         setTabsClosable(!lyxrc.single_close_tab_button);
2098 }
2099
2100
2101 void DragTabBar::mousePressEvent(QMouseEvent * event)
2102 {
2103         if (event->button() == Qt::LeftButton)
2104                 dragStartPos_ = event->pos();
2105         QTabBar::mousePressEvent(event);
2106 }
2107
2108
2109 void DragTabBar::mouseMoveEvent(QMouseEvent * event)
2110 {
2111         // If the left button isn't pressed anymore then return
2112         if (!(event->buttons() & Qt::LeftButton))
2113                 return;
2114
2115         // If the distance is too small then return
2116         if ((event->pos() - dragStartPos_).manhattanLength()
2117             < QApplication::startDragDistance())
2118                 return;
2119
2120         // did we hit something after all?
2121         int tab = tabAt(dragStartPos_);
2122         if (tab == -1)
2123                 return;
2124
2125         // simulate button release to remove highlight from button
2126         int i = currentIndex();
2127         QMouseEvent me(QEvent::MouseButtonRelease, dragStartPos_,
2128                 event->button(), event->buttons(), 0);
2129         QTabBar::mouseReleaseEvent(&me);
2130         setCurrentIndex(i);
2131
2132         // initiate Drag
2133         QDrag * drag = new QDrag(this);
2134         QMimeData * mimeData = new QMimeData;
2135         // a crude way to distinguish tab-reodering drops from other ones
2136         mimeData->setData("action", "tab-reordering") ;
2137         drag->setMimeData(mimeData);
2138
2139         // get tab pixmap as cursor
2140         QRect r = tabRect(tab);
2141         QPixmap pixmap(r.size());
2142         render(&pixmap, - r.topLeft());
2143         drag->setPixmap(pixmap);
2144         drag->exec();
2145 }
2146
2147
2148 void DragTabBar::dragEnterEvent(QDragEnterEvent * event)
2149 {
2150         // Only accept if it's an tab-reordering request
2151         QMimeData const * m = event->mimeData();
2152         QStringList formats = m->formats();
2153         if (formats.contains("action")
2154             && m->data("action") == "tab-reordering")
2155                 event->acceptProposedAction();
2156 }
2157
2158
2159 void DragTabBar::dropEvent(QDropEvent * event)
2160 {
2161         int fromIndex = tabAt(dragStartPos_);
2162         int toIndex = tabAt(event->pos());
2163
2164         // Tell interested objects that
2165         if (fromIndex != toIndex)
2166                 tabMoveRequested(fromIndex, toIndex);
2167         event->acceptProposedAction();
2168 }
2169
2170
2171 GuiWorkAreaContainer::GuiWorkAreaContainer(GuiWorkArea * wa, QWidget * parent)
2172         : QWidget(parent), wa_(wa)
2173 {
2174         LASSERT(wa, return);
2175         Ui::WorkAreaUi::setupUi(this);
2176         layout()->addWidget(wa);
2177         connect(wa, SIGNAL(titleChanged(GuiWorkArea *)),
2178                 this, SLOT(updateDisplay()));
2179         connect(reloadPB, SIGNAL(clicked()), this, SLOT(reload()));
2180         connect(ignorePB, SIGNAL(clicked()), this, SLOT(ignore()));
2181         setMessageColour({notificationFrame}, {reloadPB, ignorePB});
2182         updateDisplay();
2183 }
2184
2185
2186 void GuiWorkAreaContainer::updateDisplay()
2187 {
2188         Buffer const & buf = wa_->bufferView().buffer();
2189         notificationFrame->setHidden(!buf.notifiesExternalModification());
2190         QString const label = qt_("<b>The file %1 changed on disk.</b>")
2191                 .arg(toqstr(buf.fileName().displayName()));
2192         externalModificationLabel->setText(label);
2193 }
2194
2195
2196 void GuiWorkAreaContainer::dispatch(FuncRequest f) const
2197 {
2198         lyx::dispatch(FuncRequest(LFUN_BUFFER_SWITCH,
2199                                   wa_->bufferView().buffer().absFileName()));
2200         lyx::dispatch(f);
2201 }
2202
2203
2204 void GuiWorkAreaContainer::reload() const
2205 {
2206         dispatch(FuncRequest(LFUN_BUFFER_RELOAD));
2207 }
2208
2209
2210 void GuiWorkAreaContainer::ignore() const
2211 {
2212         dispatch(FuncRequest(LFUN_BUFFER_EXTERNAL_MODIFICATION_CLEAR));
2213 }
2214
2215
2216 void GuiWorkAreaContainer::mouseDoubleClickEvent(QMouseEvent * event)
2217 {
2218         // prevent TabWorkArea from opening a new buffer on double click
2219         event->accept();
2220 }
2221
2222
2223 } // namespace frontend
2224 } // namespace lyx
2225
2226 #include "moc_GuiWorkArea.cpp"