src/frontends/qt4/GuiWorkArea.cpp

   1 /**
   2  * \file GuiWorkArea.cpp
   3  * This file is part of LyX, the document processor.
   4  * Licence details can be found in the file COPYING.
   5  *
   6  * \author John Levon
   7  * \author Abdelrazak Younes
   8  *
   9  * Full author contact details are available in file CREDITS.
  10  */
  11
  12 #include <config.h>
  13
  14 #include "GuiWorkArea.h"
  15 #include "GuiWorkArea_Private.h"
  16
  17 #include "ColorCache.h"
  18 #include "FontLoader.h"
  19 #include "Menus.h"
  20
  21 #include "Buffer.h"
  22 #include "BufferList.h"
  23 #include "BufferParams.h"
  24 #include "BufferView.h"
  25 #include "CoordCache.h"
  26 #include "Cursor.h"
  27 #include "Font.h"
  28 #include "FuncRequest.h"
  29 #include "GuiApplication.h"
  30 #include "GuiCompleter.h"
  31 #include "GuiKeySymbol.h"
  32 #include "GuiPainter.h"
  33 #include "GuiView.h"
  34 #include "KeySymbol.h"
  35 #include "Language.h"
  36 #include "LyX.h"
  37 #include "LyXRC.h"
  38 #include "LyXVC.h"
  39 #include "qt_helpers.h"
  40 #include "Text.h"
  41 #include "TextMetrics.h"
  42 #include "version.h"
  43
  44 #include "graphics/GraphicsImage.h"
  45 #include "graphics/GraphicsLoader.h"
  46
  47 #include "support/convert.h"
  48 #include "support/debug.h"
  49 #include "support/gettext.h"
  50 #include "support/lassert.h"
  51 #include "support/TempFile.h"
  52
  53 #include "frontends/Application.h"
  54 #include "frontends/FontMetrics.h"
  55 #include "frontends/WorkAreaManager.h"
  56
  57 #include <QContextMenuEvent>
  58 #if (QT_VERSION < 0x050000)
  59 #include <QInputContext>
  60 #endif
  61 #include <QDrag>
  62 #include <QHelpEvent>
  63 #ifdef Q_OS_MAC
  64 #include <QProxyStyle>
  65 #endif
  66 #include <QMainWindow>
  67 #include <QMimeData>
  68 #include <QMenu>
  69 #include <QPainter>
  70 #include <QPalette>
  71 #include <QPixmapCache>
  72 #include <QScrollBar>
  73 #include <QStyleOption>
  74 #include <QStylePainter>
  75 #include <QTimer>
  76 #include <QToolButton>
  77 #include <QToolTip>
  78 #include <QMenuBar>
  79
  80 #include "support/bind.h"
  81
  82 #include <cmath>
  83 #include <iostream>
  84
  85 int const TabIndicatorWidth = 3;
  86
  87 #undef KeyPress
  88 #undef NoModifier
  89
  90 using namespace std;
  91 using namespace lyx::support;
  92
  93 namespace lyx {
  94
  95
  96 /// return the LyX mouse button state from Qt's
  97 static mouse_button::state q_button_state(Qt::MouseButton button)
  98 {
  99         mouse_button::state b = mouse_button::none;
 100         switch (button) {
 101                 case Qt::LeftButton:
 102                         b = mouse_button::button1;
 103                         break;
 104                 case Qt::MidButton:
 105                         b = mouse_button::button2;
 106                         break;
 107                 case Qt::RightButton:
 108                         b = mouse_button::button3;
 109                         break;
 110                 default:
 111                         break;
 112         }
 113         return b;
 114 }
 115
 116
 117 /// return the LyX mouse button state from Qt's
 118 mouse_button::state q_motion_state(Qt::MouseButtons state)
 119 {
 120         mouse_button::state b = mouse_button::none;
 121         if (state & Qt::LeftButton)
 122                 b |= mouse_button::button1;
 123         if (state & Qt::MidButton)
 124                 b |= mouse_button::button2;
 125         if (state & Qt::RightButton)
 126                 b |= mouse_button::button3;
 127         return b;
 128 }
 129
 130
 131 namespace frontend {
 132
 133 class CursorWidget {
 134 public:
 135         CursorWidget() : rtl_(false), l_shape_(false), completable_(false),
 136                 show_(false), x_(0), cursor_width_(0)
 137         {
 138                 recomputeWidth();
 139         }
 140
 141         void draw(QPainter & painter)
 142         {
 143                 if (!show_ || !rect_.isValid())
 144                         return;
 145
 146                 int y = rect_.top();
 147                 int l = x_ - rect_.left();
 148                 int r = rect_.right() - x_;
 149                 int bot = rect_.bottom();
 150
 151                 // draw vertical line
 152                 painter.fillRect(x_, y, cursor_width_, rect_.height(), color_);
 153
 154                 // draw RTL/LTR indication
 155                 painter.setPen(color_);
 156                 if (l_shape_) {
 157                         if (rtl_)
 158                                 painter.drawLine(x_, bot, x_ - l, bot);
 159                         else
 160                                 painter.drawLine(x_, bot, x_ + cursor_width_ + r, bot);
 161                 }
 162
 163                 // draw completion triangle
 164                 if (completable_) {
 165                         int m = y + rect_.height() / 2;
 166                         int d = TabIndicatorWidth - 1;
 167                         if (rtl_) {
 168                                 painter.drawLine(x_ - 1, m - d, x_ - 1 - d, m);
 169                                 painter.drawLine(x_ - 1, m + d, x_ - 1 - d, m);
 170                         } else {
 171                                 painter.drawLine(x_ + cursor_width_, m - d, x_ + cursor_width_ + d, m);
 172                                 painter.drawLine(x_ + cursor_width_, m + d, x_ + cursor_width_ + d, m);
 173                         }
 174                 }
 175         }
 176
 177         void update(int x, int y, int h, bool l_shape,
 178                 bool rtl, bool completable)
 179         {
 180                 color_ = guiApp->colorCache().get(Color_cursor);
 181                 l_shape_ = l_shape;
 182                 rtl_ = rtl;
 183                 completable_ = completable;
 184                 x_ = x;
 185
 186                 // extension to left and right
 187                 int l = 0;
 188                 int r = 0;
 189
 190                 // RTL/LTR indication
 191                 if (l_shape_) {
 192                         if (rtl)
 193                                 l += h / 3;
 194                         else
 195                                 r += h / 3;
 196                 }
 197
 198                 // completion triangle
 199                 if (completable_) {
 200                         if (rtl)
 201                                 l = max(l, TabIndicatorWidth);
 202                         else
 203                                 r = max(r, TabIndicatorWidth);
 204                 }
 205
 206                 // compute overall rectangle
 207                 rect_ = QRect(x - l, y, cursor_width_ + r + l, h);
 208         }
 209
 210         void show(bool set_show = true) { show_ = set_show; }
 211         void hide() { show_ = false; }
 212         int cursorWidth() const { return cursor_width_; }
 213         void recomputeWidth() {
 214                 cursor_width_ = lyxrc.cursor_width
 215                         ? lyxrc.cursor_width
 216                         : 1 + int((lyxrc.currentZoom + 50) / 200.0);
 217         }
 218
 219         QRect const & rect() { return rect_; }
 220
 221 private:
 222         /// cursor is in RTL or LTR text
 223         bool rtl_;
 224         /// indication for RTL or LTR
 225         bool l_shape_;
 226         /// triangle to show that a completion is available
 227         bool completable_;
 228         ///
 229         bool show_;
 230         ///
 231         QColor color_;
 232         /// rectangle, possibly with l_shape and completion triangle
 233         QRect rect_;
 234         /// x position (were the vertical line is drawn)
 235         int x_;
 236
 237         int cursor_width_;
 238 };
 239
 240
 241 // This is a 'heartbeat' generating synthetic mouse move events when the
 242 // cursor is at the top or bottom edge of the viewport. One scroll per 0.2 s
 243 SyntheticMouseEvent::SyntheticMouseEvent()
 244         : timeout(200), restart_timeout(true)
 245 {}
 246
 247
 248 GuiWorkArea::Private::Private(GuiWorkArea * parent)
 249 : p(parent), screen_(0), buffer_view_(0), lyx_view_(0),
 250   cursor_visible_(false), cursor_(0),
 251   need_resize_(false), schedule_redraw_(false), preedit_lines_(1),
 252   pixel_ratio_(1.0),
 253   completer_(new GuiCompleter(p, p)), dialog_mode_(false),
 254   read_only_(false), clean_(true), externally_modified_(false)
 255 {
 256 }
 257
 258
 259 GuiWorkArea::GuiWorkArea(QWidget * /* w */)
 260 : d(new Private(this))
 261 {
 262 }
 263
 264
 265 GuiWorkArea::GuiWorkArea(Buffer & buffer, GuiView & gv)
 266 : d(new Private(this))
 267 {
 268         setGuiView(gv);
 269         buffer.params().display_pixel_ratio = theGuiApp()->pixelRatio();
 270         setBuffer(buffer);
 271         init();
 272 }
 273
 274
 275 double GuiWorkArea::pixelRatio() const
 276 {
 277 #if QT_VERSION >= 0x050000
 278         return qt_scale_factor * devicePixelRatio();
 279 #else
 280         return 1.0;
 281 #endif
 282 }
 283
 284
 285 void GuiWorkArea::init()
 286 {
 287         // Setup the signals
 288         connect(&d->cursor_timeout_, SIGNAL(timeout()),
 289                 this, SLOT(toggleCursor()));
 290
 291         int const time = QApplication::cursorFlashTime() / 2;
 292         if (time > 0) {
 293                 d->cursor_timeout_.setInterval(time);
 294                 d->cursor_timeout_.start();
 295         } else {
 296                 // let's initialize this just to be safe
 297                 d->cursor_timeout_.setInterval(500);
 298         }
 299
 300         d->resetScreen();
 301         // With Qt4.5 a mouse event will happen before the first paint event
 302         // so make sure that the buffer view has an up to date metrics.
 303         d->buffer_view_->resize(viewport()->width(), viewport()->height());
 304         d->cursor_ = new frontend::CursorWidget();
 305         d->cursor_->hide();
 306
 307         setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 308         setAcceptDrops(true);
 309         setMouseTracking(true);
 310         setMinimumSize(100, 70);
 311         setFrameStyle(QFrame::NoFrame);
 312         updateWindowTitle();
 313
 314         viewport()->setAutoFillBackground(false);
 315         // We don't need double-buffering nor SystemBackground on
 316         // the viewport because we have our own backing pixmap.
 317         viewport()->setAttribute(Qt::WA_NoSystemBackground);
 318
 319         setFocusPolicy(Qt::StrongFocus);
 320
 321         d->setCursorShape(Qt::IBeamCursor);
 322
 323         // This connection is closed at the same time as this is destroyed.
 324         d->synthetic_mouse_event_.timeout.timeout.connect([this](){
 325                         generateSyntheticMouseEvent();
 326                 });
 327
 328         // Initialize the vertical Scroll Bar
 329         QObject::connect(verticalScrollBar(), SIGNAL(valueChanged(int)),
 330                 this, SLOT(scrollTo(int)));
 331
 332         LYXERR(Debug::GUI, "viewport width: " << viewport()->width()
 333                 << "  viewport height: " << viewport()->height());
 334
 335         // Enables input methods for asian languages.
 336         // Must be set when creating custom text editing widgets.
 337         setAttribute(Qt::WA_InputMethodEnabled, true);
 338
 339         d->dialog_mode_ = false;
 340 }
 341
 342
 343 GuiWorkArea::~GuiWorkArea()
 344 {
 345         // If something is wrong with the buffer, we can ignore it safely
 346         try {
 347                 d->buffer_view_->buffer().workAreaManager().remove(this);
 348         } catch(...) {}
 349         delete d->screen_;
 350         delete d->buffer_view_;
 351         delete d->cursor_;
 352         // Completer has a QObject parent and is thus automatically destroyed.
 353         // See #4758.
 354         // delete completer_;
 355         delete d;
 356 }
 357
 358
 359 Qt::CursorShape GuiWorkArea::cursorShape() const
 360 {
 361         return viewport()->cursor().shape();
 362 }
 363
 364
 365 void GuiWorkArea::Private::setCursorShape(Qt::CursorShape shape)
 366 {
 367         p->viewport()->setCursor(shape);
 368 }
 369
 370
 371 void GuiWorkArea::Private::updateCursorShape()
 372 {
 373         setCursorShape(buffer_view_->clickableInset()
 374                 ? Qt::PointingHandCursor : Qt::IBeamCursor);
 375 }
 376
 377
 378 void GuiWorkArea::setGuiView(GuiView & gv)
 379 {
 380         d->lyx_view_ = &gv;
 381 }
 382
 383
 384 void GuiWorkArea::setBuffer(Buffer & buffer)
 385 {
 386         delete d->buffer_view_;
 387         d->buffer_view_ = new BufferView(buffer);
 388         buffer.workAreaManager().add(this);
 389
 390         // HACK: Prevents an additional redraw when the scrollbar pops up
 391         // which regularily happens on documents with more than one page.
 392         // The policy  should be set to "Qt::ScrollBarAsNeeded" soon.
 393         // Since we have no geometry information yet, we assume that
 394         // a document needs a scrollbar if there is more then four
 395         // paragraph in the outermost text.
 396         if (buffer.text().paragraphs().size() > 4)
 397                 setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
 398         QTimer::singleShot(50, this, SLOT(fixVerticalScrollBar()));
 399         Q_EMIT bufferViewChanged();
 400 }
 401
 402
 403 void GuiWorkArea::fixVerticalScrollBar()
 404 {
 405         if (!isFullScreen())
 406                 setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
 407 }
 408
 409
 410 void GuiWorkArea::close()
 411 {
 412         d->lyx_view_->removeWorkArea(this);
 413 }
 414
 415
 416 void GuiWorkArea::setFullScreen(bool full_screen)
 417 {
 418         d->buffer_view_->setFullScreen(full_screen);
 419         setFrameStyle(QFrame::NoFrame);
 420         if (full_screen) {
 421                 setFrameStyle(QFrame::NoFrame);
 422                 if (lyxrc.full_screen_scrollbar)
 423                         setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 424         } else
 425                 setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
 426 }
 427
 428
 429 BufferView & GuiWorkArea::bufferView()
 430 {
 431         return *d->buffer_view_;
 432 }
 433
 434
 435 BufferView const & GuiWorkArea::bufferView() const
 436 {
 437         return *d->buffer_view_;
 438 }
 439
 440
 441 void GuiWorkArea::stopBlinkingCursor()
 442 {
 443         d->cursor_timeout_.stop();
 444         d->hideCursor();
 445 }
 446
 447
 448 void GuiWorkArea::startBlinkingCursor()
 449 {
 450         // do not show the cursor if the view is busy
 451         if (view().busy())
 452                 return;
 453
 454         Point p;
 455         int h = 0;
 456         d->buffer_view_->cursorPosAndHeight(p, h);
 457         // Don't start blinking if the cursor isn't on screen.
 458         if (!d->buffer_view_->cursorInView(p, h))
 459                 return;
 460
 461         d->showCursor();
 462
 463         //we're not supposed to cache this value.
 464         int const time = QApplication::cursorFlashTime() / 2;
 465         if (time <= 0)
 466                 return;
 467         d->cursor_timeout_.setInterval(time);
 468         d->cursor_timeout_.start();
 469 }
 470
 471
 472 void GuiWorkArea::redraw(bool update_metrics)
 473 {
 474         if (!isVisible())
 475                 // No need to redraw in this case.
 476                 return;
 477
 478         // No need to do anything if this is the current view. The BufferView
 479         // metrics are already up to date.
 480         if (update_metrics || d->lyx_view_ != guiApp->currentView()
 481                 || d->lyx_view_->currentWorkArea() != this) {
 482                 // FIXME: it would be nice to optimize for the off-screen case.
 483                 d->buffer_view_->cursor().fixIfBroken();
 484                 d->buffer_view_->updateMetrics();
 485                 d->buffer_view_->cursor().fixIfBroken();
 486         }
 487
 488         // update cursor position, because otherwise it has to wait until
 489         // the blinking interval is over
 490         if (d->cursor_visible_) {
 491                 d->hideCursor();
 492                 d->showCursor();
 493         }
 494
 495         LYXERR(Debug::WORKAREA, "WorkArea::redraw screen");
 496         d->updateScreen();
 497         update(0, 0, viewport()->width(), viewport()->height());
 498
 499         /// \warning: scrollbar updating *must* be done after the BufferView is drawn
 500         /// because \c BufferView::updateScrollbar() is called in \c BufferView::draw().
 501         d->updateScrollbar();
 502         d->lyx_view_->updateStatusBar();
 503
 504         if (lyxerr.debugging(Debug::WORKAREA))
 505                 d->buffer_view_->coordCache().dump();
 506
 507         updateWindowTitle();
 508
 509         d->updateCursorShape();
 510 }
 511
 512
 513 // Keep in sync with GuiWorkArea::processKeySym below
 514 bool GuiWorkArea::queryKeySym(KeySymbol const & key, KeyModifier mod) const
 515 {
 516         return guiApp->queryKeySym(key, mod);
 517 }
 518
 519
 520 // Keep in sync with GuiWorkArea::queryKeySym above
 521 void GuiWorkArea::processKeySym(KeySymbol const & key, KeyModifier mod)
 522 {
 523         if (d->lyx_view_->isFullScreen() && d->lyx_view_->menuBar()->isVisible()
 524                 && lyxrc.full_screen_menubar) {
 525                 // FIXME HACK: we should not have to do this here. See related comment
 526                 // in GuiView::event() (QEvent::ShortcutOverride)
 527                 d->lyx_view_->menuBar()->hide();
 528         }
 529
 530         // In order to avoid bad surprise in the middle of an operation,
 531         // we better stop the blinking cursor...
 532         // the cursor gets restarted in GuiView::restartCursor()
 533         stopBlinkingCursor();
 534         guiApp->processKeySym(key, mod);
 535 }
 536
 537
 538 void GuiWorkArea::Private::dispatch(FuncRequest const & cmd)
 539 {
 540         // Handle drag&drop
 541         if (cmd.action() == LFUN_FILE_OPEN) {
 542                 DispatchResult dr;
 543                 lyx_view_->dispatch(cmd, dr);
 544                 return;
 545         }
 546
 547         bool const notJustMovingTheMouse =
 548                 cmd.action() != LFUN_MOUSE_MOTION || cmd.button() != mouse_button::none;
 549
 550         // In order to avoid bad surprise in the middle of an operation, we better stop
 551         // the blinking cursor.
 552         if (notJustMovingTheMouse)
 553                 p->stopBlinkingCursor();
 554
 555         buffer_view_->mouseEventDispatch(cmd);
 556
 557         // Skip these when selecting
 558         // FIXME: let GuiView take care of those.
 559         if (cmd.action() != LFUN_MOUSE_MOTION) {
 560                 completer_->updateVisibility(false, false);
 561                 lyx_view_->updateDialogs();
 562                 lyx_view_->updateStatusBar();
 563         }
 564
 565         // GUI tweaks except with mouse motion with no button pressed.
 566         if (notJustMovingTheMouse) {
 567                 // Slight hack: this is only called currently when we
 568                 // clicked somewhere, so we force through the display
 569                 // of the new status here.
 570                 // FIXME: let GuiView take care of those.
 571                 lyx_view_->clearMessage();
 572
 573                 // Show the cursor immediately after any operation
 574                 p->startBlinkingCursor();
 575         }
 576
 577         updateCursorShape();
 578 }
 579
 580
 581 void GuiWorkArea::Private::resizeBufferView()
 582 {
 583         // WARNING: Please don't put any code that will trigger a repaint here!
 584         // We are already inside a paint event.
 585         p->stopBlinkingCursor();
 586         // Warn our container (GuiView).
 587         p->busy(true);
 588
 589         Point point;
 590         int h = 0;
 591         buffer_view_->cursorPosAndHeight(point, h);
 592         bool const cursor_in_view = buffer_view_->cursorInView(point, h);
 593         buffer_view_->resize(p->viewport()->width(), p->viewport()->height());
 594         if (cursor_in_view)
 595                 buffer_view_->scrollToCursor();
 596         updateScreen();
 597
 598         // Update scrollbars which might have changed due different
 599         // BufferView dimension. This is especially important when the
 600         // BufferView goes from zero-size to the real-size for the first time,
 601         // as the scrollbar paramters are then set for the first time.
 602         updateScrollbar();
 603
 604         need_resize_ = false;
 605         p->busy(false);
 606         // Eventually, restart the cursor after the resize event.
 607         // We might be resizing even if the focus is on another widget so we only
 608         // restart the cursor if we have the focus.
 609         if (p->hasFocus())
 610                 QTimer::singleShot(50, p, SLOT(startBlinkingCursor()));
 611 }
 612
 613
 614 void GuiWorkArea::Private::showCursor()
 615 {
 616         if (cursor_visible_)
 617                 return;
 618
 619         Point p;
 620         int h = 0;
 621         buffer_view_->cursorPosAndHeight(p, h);
 622         if (!buffer_view_->cursorInView(p, h))
 623                 return;
 624
 625         // RTL or not RTL
 626         bool l_shape = false;
 627         Font const & realfont = buffer_view_->cursor().real_current_font;
 628         BufferParams const & bp = buffer_view_->buffer().params();
 629         bool const samelang = realfont.language() == bp.language;
 630         bool const isrtl = realfont.isVisibleRightToLeft();
 631
 632         if (!samelang || isrtl != bp.language->rightToLeft())
 633                 l_shape = true;
 634
 635         // The ERT language hack needs fixing up
 636         if (realfont.language() == latex_language)
 637                 l_shape = false;
 638
 639         // show cursor on screen
 640         Cursor & cur = buffer_view_->cursor();
 641         bool completable = cur.inset().showCompletionCursor()
 642                 && completer_->completionAvailable()
 643                 && !completer_->popupVisible()
 644                 && !completer_->inlineVisible();
 645         cursor_visible_ = true;
 646         cursor_->recomputeWidth();
 647
 648         //int cur_x = buffer_view_->getPos(cur).x_;
 649         // We may have decided to slide the cursor row so that cursor
 650         // is visible.
 651         p.x_ -= buffer_view_->horizScrollOffset();
 652
 653         showCursor(p.x_, p.y_, h, l_shape, isrtl, completable);
 654 }
 655
 656
 657 void GuiWorkArea::Private::hideCursor()
 658 {
 659         if (!cursor_visible_)
 660                 return;
 661
 662         cursor_visible_ = false;
 663         removeCursor();
 664 }
 665
 666
 667 void GuiWorkArea::toggleCursor()
 668 {
 669         if (d->cursor_visible_)
 670                 d->hideCursor();
 671         else
 672                 d->showCursor();
 673 }
 674
 675
 676 void GuiWorkArea::Private::updateScrollbar()
 677 {
 678         ScrollbarParameters const & scroll_ = buffer_view_->scrollbarParameters();
 679         // Block signals to prevent setRange() and setSliderPosition from causing
 680         // recursive calls via the signal valueChanged. (#10311)
 681         QSignalBlocker blocker(p->verticalScrollBar());
 682         p->verticalScrollBar()->setRange(scroll_.min, scroll_.max);
 683         p->verticalScrollBar()->setPageStep(scroll_.page_step);
 684         p->verticalScrollBar()->setSingleStep(scroll_.single_step);
 685         p->verticalScrollBar()->setSliderPosition(0);
 686 }
 687
 688
 689 void GuiWorkArea::scrollTo(int value)
 690 {
 691         stopBlinkingCursor();
 692         d->buffer_view_->scrollDocView(value, true);
 693
 694         if (lyxrc.cursor_follows_scrollbar) {
 695                 d->buffer_view_->setCursorFromScrollbar();
 696                 // FIXME: let GuiView take care of those.
 697                 d->lyx_view_->updateLayoutList();
 698         }
 699         // Show the cursor immediately after any operation.
 700         startBlinkingCursor();
 701         // FIXME QT5
 702 #ifdef Q_WS_X11
 703         QApplication::syncX();
 704 #endif
 705 }
 706
 707
 708 bool GuiWorkArea::event(QEvent * e)
 709 {
 710         switch (e->type()) {
 711         case QEvent::ToolTip: {
 712                 QHelpEvent * helpEvent = static_cast<QHelpEvent *>(e);
 713                 if (lyxrc.use_tooltip) {
 714                         QPoint pos = helpEvent->pos();
 715                         if (pos.x() < viewport()->width()) {
 716                                 QString s = toqstr(d->buffer_view_->toolTip(pos.x(), pos.y()));
 717                                 QToolTip::showText(helpEvent->globalPos(), formatToolTip(s,35));
 718                         }
 719                         else
 720                                 QToolTip::hideText();
 721                 }
 722                 // Don't forget to accept the event!
 723                 e->accept();
 724                 return true;
 725         }
 726
 727         case QEvent::ShortcutOverride:
 728                 // keyPressEvent is ShortcutOverride-aware and only accepts the event in
 729                 // this case
 730                 keyPressEvent(static_cast<QKeyEvent *>(e));
 731                 return e->isAccepted();
 732
 733         case QEvent::KeyPress: {
 734                 // We catch this event in order to catch the Tab or Shift+Tab key press
 735                 // which are otherwise reserved to focus switching between controls
 736                 // within a dialog.
 737                 QKeyEvent * ke = static_cast<QKeyEvent*>(e);
 738                 if ((ke->key() == Qt::Key_Tab && ke->modifiers() == Qt::NoModifier)
 739                         || (ke->key() == Qt::Key_Backtab && (
 740                                 ke->modifiers() == Qt::ShiftModifier
 741                                 || ke->modifiers() == Qt::NoModifier))) {
 742                         keyPressEvent(ke);
 743                         return true;
 744                 }
 745                 return QAbstractScrollArea::event(e);
 746         }
 747
 748         default:
 749                 return QAbstractScrollArea::event(e);
 750         }
 751         return false;
 752 }
 753
 754
 755 void GuiWorkArea::contextMenuEvent(QContextMenuEvent * e)
 756 {
 757         string name;
 758         if (e->reason() == QContextMenuEvent::Mouse)
 759                 // the menu name is set on mouse press
 760                 name = d->context_menu_name_;
 761         else {
 762                 QPoint pos = e->pos();
 763                 Cursor const & cur = d->buffer_view_->cursor();
 764                 if (e->reason() == QContextMenuEvent::Keyboard && cur.inTexted()) {
 765                         // Do not access the context menu of math right in front of before
 766                         // the cursor. This does not work when the cursor is in text.
 767                         Inset * inset = cur.paragraph().getInset(cur.pos());
 768                         if (inset && inset->asInsetMath())
 769                                 --pos.rx();
 770                         else if (cur.pos() > 0) {
 771                                 Inset * inset = cur.paragraph().getInset(cur.pos() - 1);
 772                                 if (inset)
 773                                         ++pos.rx();
 774                         }
 775                 }
 776                 name = d->buffer_view_->contextMenu(pos.x(), pos.y());
 777         }
 778
 779         if (name.empty()) {
 780                 QAbstractScrollArea::contextMenuEvent(e);
 781                 return;
 782         }
 783         // always show mnemonics when the keyboard is used to show the context menu
 784         // FIXME: This should be fixed in Qt itself
 785         bool const keyboard = (e->reason() == QContextMenuEvent::Keyboard);
 786         QMenu * menu = guiApp->menus().menu(toqstr(name), *d->lyx_view_, keyboard);
 787         if (!menu) {
 788                 QAbstractScrollArea::contextMenuEvent(e);
 789                 return;
 790         }
 791         // Position the menu to the right.
 792         // FIXME: menu position should be different for RTL text.
 793         menu->exec(e->globalPos());
 794         e->accept();
 795 }
 796
 797
 798 void GuiWorkArea::focusInEvent(QFocusEvent * e)
 799 {
 800         LYXERR(Debug::DEBUG, "GuiWorkArea::focusInEvent(): " << this << endl);
 801         if (d->lyx_view_->currentWorkArea() != this) {
 802                 d->lyx_view_->setCurrentWorkArea(this);
 803                 d->lyx_view_->currentWorkArea()->bufferView().buffer().updateBuffer();
 804         }
 805
 806         startBlinkingCursor();
 807         QAbstractScrollArea::focusInEvent(e);
 808 }
 809
 810
 811 void GuiWorkArea::focusOutEvent(QFocusEvent * e)
 812 {
 813         LYXERR(Debug::DEBUG, "GuiWorkArea::focusOutEvent(): " << this << endl);
 814         stopBlinkingCursor();
 815         QAbstractScrollArea::focusOutEvent(e);
 816 }
 817
 818
 819 void GuiWorkArea::mousePressEvent(QMouseEvent * e)
 820 {
 821         if (d->dc_event_.active && d->dc_event_ == *e) {
 822                 d->dc_event_.active = false;
 823                 FuncRequest cmd(LFUN_MOUSE_TRIPLE, e->x(), e->y(),
 824                         q_button_state(e->button()), q_key_state(e->modifiers()));
 825                 d->dispatch(cmd);
 826                 e->accept();
 827                 return;
 828         }
 829
 830 #if (QT_VERSION < 0x050000) && !defined(__HAIKU__)
 831         inputContext()->reset();
 832 #endif
 833
 834         FuncRequest const cmd(LFUN_MOUSE_PRESS, e->x(), e->y(),
 835                         q_button_state(e->button()), q_key_state(e->modifiers()));
 836         d->dispatch(cmd);
 837
 838         // Save the context menu on mouse press, because also the mouse
 839         // cursor is set on mouse press. Afterwards, we can either release
 840         // the mousebutton somewhere else, or the cursor might have moved
 841         // due to the DEPM. We need to do this after the mouse has been
 842         // set in dispatch(), because the selection state might change.
 843         if (e->button() == Qt::RightButton)
 844                 d->context_menu_name_ = d->buffer_view_->contextMenu(e->x(), e->y());
 845
 846         e->accept();
 847 }
 848
 849
 850 void GuiWorkArea::mouseReleaseEvent(QMouseEvent * e)
 851 {
 852         if (d->synthetic_mouse_event_.timeout.running())
 853                 d->synthetic_mouse_event_.timeout.stop();
 854
 855         FuncRequest const cmd(LFUN_MOUSE_RELEASE, e->x(), e->y(),
 856                         q_button_state(e->button()), q_key_state(e->modifiers()));
 857         d->dispatch(cmd);
 858         e->accept();
 859 }
 860
 861
 862 void GuiWorkArea::mouseMoveEvent(QMouseEvent * e)
 863 {
 864         // we kill the triple click if we move
 865         doubleClickTimeout();
 866         FuncRequest cmd(LFUN_MOUSE_MOTION, e->x(), e->y(),
 867                         q_motion_state(e->buttons()), q_key_state(e->modifiers()));
 868
 869         e->accept();
 870
 871         // If we're above or below the work area...
 872         if ((e->y() <= 20 || e->y() >= viewport()->height() - 20)
 873                         && e->buttons() == mouse_button::button1) {
 874                 // Make sure only a synthetic event can cause a page scroll,
 875                 // so they come at a steady rate:
 876                 if (e->y() <= 20)
 877                         // _Force_ a scroll up:
 878                         cmd.set_y(e->y() - 21);
 879                 else
 880                         cmd.set_y(e->y() + 21);
 881                 // Store the event, to be handled when the timeout expires.
 882                 d->synthetic_mouse_event_.cmd = cmd;
 883
 884                 if (d->synthetic_mouse_event_.timeout.running()) {
 885                         // Discard the event. Note that it _may_ be handled
 886                         // when the timeout expires if
 887                         // synthetic_mouse_event_.cmd has not been overwritten.
 888                         // Ie, when the timeout expires, we handle the
 889                         // most recent event but discard all others that
 890                         // occurred after the one used to start the timeout
 891                         // in the first place.
 892                         return;
 893                 }
 894
 895                 d->synthetic_mouse_event_.restart_timeout = true;
 896                 d->synthetic_mouse_event_.timeout.start();
 897                 // Fall through to handle this event...
 898
 899         } else if (d->synthetic_mouse_event_.timeout.running()) {
 900                 // Store the event, to be possibly handled when the timeout
 901                 // expires.
 902                 // Once the timeout has expired, normal control is returned
 903                 // to mouseMoveEvent (restart_timeout = false).
 904                 // This results in a much smoother 'feel' when moving the
 905                 // mouse back into the work area.
 906                 d->synthetic_mouse_event_.cmd = cmd;
 907                 d->synthetic_mouse_event_.restart_timeout = false;
 908                 return;
 909         }
 910         d->dispatch(cmd);
 911 }
 912
 913
 914 void GuiWorkArea::wheelEvent(QWheelEvent * ev)
 915 {
 916         // Wheel rotation by one notch results in a delta() of 120 (see
 917         // documentation of QWheelEvent)
 918         double const delta = ev->delta() / 120.0;
 919         bool zoom = false;
 920         switch (lyxrc.scroll_wheel_zoom) {
 921         case LyXRC::SCROLL_WHEEL_ZOOM_CTRL:
 922                 zoom = ev->modifiers() & Qt::ControlModifier;
 923                 zoom &= !(ev->modifiers() & (Qt::ShiftModifier | Qt::AltModifier));
 924                 break;
 925         case LyXRC::SCROLL_WHEEL_ZOOM_SHIFT:
 926                 zoom = ev->modifiers() & Qt::ShiftModifier;
 927                 zoom &= !(ev->modifiers() & (Qt::ControlModifier | Qt::AltModifier));
 928                 break;
 929         case LyXRC::SCROLL_WHEEL_ZOOM_ALT:
 930                 zoom = ev->modifiers() & Qt::AltModifier;
 931                 zoom &= !(ev->modifiers() & (Qt::ShiftModifier | Qt::ControlModifier));
 932                 break;
 933         case LyXRC::SCROLL_WHEEL_ZOOM_OFF:
 934                 break;
 935         }
 936         if (zoom) {
 937                 docstring arg = convert<docstring>(int(5 * delta));
 938                 lyx::dispatch(FuncRequest(LFUN_BUFFER_ZOOM_IN, arg));
 939                 return;
 940         }
 941
 942         // Take into account the desktop wide settings.
 943         int const lines = qApp->wheelScrollLines();
 944         int const page_step = verticalScrollBar()->pageStep();
 945         // Test if the wheel mouse is set to one screen at a time.
 946         // This is according to
 947         // https://doc.qt.io/qt-5/qapplication.html#wheelScrollLines-prop
 948         int scroll_value =
 949                 min(lines * verticalScrollBar()->singleStep(), page_step);
 950
 951         // Take into account the rotation and the user preferences.
 952         scroll_value = int(scroll_value * delta * lyxrc.mouse_wheel_speed);
 953         LYXERR(Debug::SCROLLING, "wheelScrollLines = " << lines
 954                         << " delta = " << delta << " scroll_value = " << scroll_value
 955                         << " page_step = " << page_step);
 956         // Now scroll.
 957         verticalScrollBar()->setValue(verticalScrollBar()->value() - scroll_value);
 958
 959         ev->accept();
 960 }
 961
 962
 963 void GuiWorkArea::generateSyntheticMouseEvent()
 964 {
 965         int const e_y = d->synthetic_mouse_event_.cmd.y();
 966         int const wh = d->buffer_view_->workHeight();
 967         bool const up = e_y < 0;
 968         bool const down = e_y > wh;
 969
 970         // Set things off to generate the _next_ 'pseudo' event.
 971         int step = 50;
 972         if (d->synthetic_mouse_event_.restart_timeout) {
 973                 // This is some magic formulae to determine the speed
 974                 // of scrolling related to the position of the mouse.
 975                 int time = 200;
 976                 if (up || down) {
 977                         int dist = up ? -e_y : e_y - wh;
 978                         time = max(min(200, 250000 / (dist * dist)), 1) ;
 979
 980                         if (time < 40) {
 981                                 step = 80000 / (time * time);
 982                                 time = 40;
 983                         }
 984                 }
 985                 d->synthetic_mouse_event_.timeout.setTimeout(time);
 986                 d->synthetic_mouse_event_.timeout.start();
 987         }
 988
 989         // Can we scroll further ?
 990         int const value = verticalScrollBar()->value();
 991         if (value == verticalScrollBar()->maximum()
 992                   || value == verticalScrollBar()->minimum()) {
 993                 d->synthetic_mouse_event_.timeout.stop();
 994                 return;
 995         }
 996
 997         // Scroll
 998         if (step <= 2 * wh) {
 999                 d->buffer_view_->scroll(up ? -step : step);
1000                 d->buffer_view_->updateMetrics();
1001         } else {
1002                 d->buffer_view_->scrollDocView(value + (up ? -step : step), false);
1003         }
1004
1005         // In which paragraph do we have to set the cursor ?
1006         Cursor & cur = d->buffer_view_->cursor();
1007         // FIXME: we don't know howto handle math.
1008         Text * text = cur.text();
1009         if (!text)
1010                 return;
1011         TextMetrics const & tm = d->buffer_view_->textMetrics(text);
1012
1013         pair<pit_type, const ParagraphMetrics *> pp = up ? tm.first() : tm.last();
1014         ParagraphMetrics const & pm = *pp.second;
1015         pit_type const pit = pp.first;
1016
1017         if (pm.rows().empty())
1018                 return;
1019
1020         // Find the row at which we set the cursor.
1021         RowList::const_iterator rit = pm.rows().begin();
1022         RowList::const_iterator rlast = pm.rows().end();
1023         int yy = pm.position() - pm.ascent();
1024         for (--rlast; rit != rlast; ++rit) {
1025                 int h = rit->height();
1026                 if ((up && yy + h > 0)
1027                           || (!up && yy + h > wh - defaultRowHeight()))
1028                         break;
1029                 yy += h;
1030         }
1031
1032         // Find the position of the cursor
1033         bool bound;
1034         int x = d->synthetic_mouse_event_.cmd.x();
1035         pos_type const pos = tm.getPosNearX(*rit, x, bound);
1036
1037         // Set the cursor
1038         cur.pit() = pit;
1039         cur.pos() = pos;
1040         cur.boundary(bound);
1041
1042         d->buffer_view_->buffer().changed(false);
1043         return;
1044 }
1045
1046
1047 void GuiWorkArea::keyPressEvent(QKeyEvent * ev)
1048 {
1049         // this is also called for ShortcutOverride events. In this case, one must
1050         // not act but simply accept the event explicitly.
1051         bool const act = (ev->type() != QEvent::ShortcutOverride);
1052
1053         // Do not process here some keys if dialog_mode_ is set
1054         if (d->dialog_mode_
1055                 && (ev->modifiers() == Qt::NoModifier
1056                     || ev->modifiers() == Qt::ShiftModifier)
1057                 && (ev->key() == Qt::Key_Escape
1058                     || ev->key() == Qt::Key_Enter
1059                     || ev->key() == Qt::Key_Return)
1060             ) {
1061                 ev->ignore();
1062                 return;
1063         }
1064
1065         // intercept some keys if completion popup is visible
1066         if (d->completer_->popupVisible()) {
1067                 switch (ev->key()) {
1068                 case Qt::Key_Enter:
1069                 case Qt::Key_Return:
1070                         if (act)
1071                                 d->completer_->activate();
1072                         ev->accept();
1073                         return;
1074                 }
1075         }
1076
1077         // do nothing if there are other events
1078         // (the auto repeated events come too fast)
1079         // it looks like this is only needed on X11
1080 #if defined(Q_WS_X11) || defined(QPA_XCB)
1081         // FIXME: this is a weird way to implement event compression. Also, this is
1082         // broken with IBus.
1083         if (act && qApp->hasPendingEvents() && ev->isAutoRepeat()) {
1084                 switch (ev->key()) {
1085                 case Qt::Key_PageDown:
1086                 case Qt::Key_PageUp:
1087                 case Qt::Key_Left:
1088                 case Qt::Key_Right:
1089                 case Qt::Key_Up:
1090                 case Qt::Key_Down:
1091                         LYXERR(Debug::KEY, "system is busy: scroll key event ignored");
1092                         ev->ignore();
1093                         return;
1094                 }
1095         }
1096 #endif
1097
1098         KeyModifier const m = q_key_state(ev->modifiers());
1099
1100         std::string str;
1101         if (m & ShiftModifier)
1102                 str += "Shift-";
1103         if (m & ControlModifier)
1104                 str += "Control-";
1105         if (m & AltModifier)
1106                 str += "Alt-";
1107         if (m & MetaModifier)
1108                 str += "Meta-";
1109
1110         if (act)
1111                 LYXERR(Debug::KEY, " count: " << ev->count() << " text: " << ev->text()
1112                        << " isAutoRepeat: " << ev->isAutoRepeat() << " key: " << ev->key()
1113                        << " keyState: " << str);
1114
1115         KeySymbol sym;
1116         setKeySymbol(&sym, ev);
1117         if (sym.isOK()) {
1118                 if (act) {
1119                         processKeySym(sym, m);
1120                         ev->accept();
1121                 } else
1122                         ev->setAccepted(queryKeySym(sym, m));
1123         } else {
1124                 ev->ignore();
1125         }
1126 }
1127
1128
1129 void GuiWorkArea::doubleClickTimeout()
1130 {
1131         d->dc_event_.active = false;
1132 }
1133
1134
1135 void GuiWorkArea::mouseDoubleClickEvent(QMouseEvent * ev)
1136 {
1137         d->dc_event_ = DoubleClick(ev);
1138         QTimer::singleShot(QApplication::doubleClickInterval(), this,
1139                         SLOT(doubleClickTimeout()));
1140         FuncRequest cmd(LFUN_MOUSE_DOUBLE, ev->x(), ev->y(),
1141                         q_button_state(ev->button()), q_key_state(ev->modifiers()));
1142         d->dispatch(cmd);
1143         ev->accept();
1144 }
1145
1146
1147 void GuiWorkArea::resizeEvent(QResizeEvent * ev)
1148 {
1149         QAbstractScrollArea::resizeEvent(ev);
1150         d->need_resize_ = true;
1151         ev->accept();
1152 }
1153
1154
1155 void GuiWorkArea::Private::update(int x, int y, int w, int h)
1156 {
1157         p->viewport()->update(x, y, w, h);
1158 }
1159
1160
1161 void GuiWorkArea::paintEvent(QPaintEvent * ev)
1162 {
1163         QRectF const rc = ev->rect();
1164         // LYXERR(Debug::PAINTING, "paintEvent begin: x: " << rc.x()
1165         //      << " y: " << rc.y() << " w: " << rc.width() << " h: " << rc.height());
1166
1167         if (d->needResize()) {
1168                 d->resetScreen();
1169                 d->resizeBufferView();
1170                 if (d->cursor_visible_) {
1171                         d->hideCursor();
1172                         d->showCursor();
1173                 }
1174         }
1175
1176         QPainter pain(viewport());
1177         double const pr = pixelRatio();
1178         QRectF const rcs = QRectF(rc.x() * pr, rc.y() * pr, rc.width() * pr, rc.height() * pr);
1179
1180         if (lyxrc.use_qimage) {
1181                 QImage const & image = static_cast<QImage const &>(*d->screen_);
1182                 pain.drawImage(rc, image, rcs);
1183         } else {
1184                 QPixmap const & pixmap = static_cast<QPixmap const &>(*d->screen_);
1185                 pain.drawPixmap(rc, pixmap, rcs);
1186         }
1187         d->cursor_->draw(pain);
1188         ev->accept();
1189 }
1190
1191
1192 void GuiWorkArea::Private::updateScreen()
1193 {
1194         GuiPainter pain(screen_, p->pixelRatio());
1195         buffer_view_->draw(pain);
1196 }
1197
1198
1199 void GuiWorkArea::Private::showCursor(int x, int y, int h,
1200         bool l_shape, bool rtl, bool completable)
1201 {
1202         if (schedule_redraw_) {
1203                 // This happens when a graphic conversion is finished. As we don't know
1204                 // the size of the new graphics, it's better the update everything.
1205                 // We can't use redraw() here because this would trigger a infinite
1206                 // recursive loop with showCursor().
1207                 buffer_view_->resize(p->viewport()->width(), p->viewport()->height());
1208                 updateScreen();
1209                 updateScrollbar();
1210                 p->viewport()->update(QRect(0, 0, p->viewport()->width(), p->viewport()->height()));
1211                 schedule_redraw_ = false;
1212                 // Show the cursor immediately after the update.
1213                 hideCursor();
1214                 p->toggleCursor();
1215                 return;
1216         }
1217
1218         cursor_->update(x, y, h, l_shape, rtl, completable);
1219         cursor_->show();
1220         p->viewport()->update(cursor_->rect());
1221 }
1222
1223
1224 void GuiWorkArea::Private::removeCursor()
1225 {
1226         cursor_->hide();
1227         //if (!qApp->focusWidget())
1228                 p->viewport()->update(cursor_->rect());
1229 }
1230
1231
1232 void GuiWorkArea::inputMethodEvent(QInputMethodEvent * e)
1233 {
1234         QString const & commit_string = e->commitString();
1235         docstring const & preedit_string
1236                 = qstring_to_ucs4(e->preeditString());
1237
1238         if (!commit_string.isEmpty()) {
1239
1240                 LYXERR(Debug::KEY, "preeditString: " << e->preeditString()
1241                         << " commitString: " << e->commitString());
1242
1243                 int key = 0;
1244
1245                 // FIXME Iwami 04/01/07: we should take care also of UTF16 surrogates here.
1246                 for (int i = 0; i != commit_string.size(); ++i) {
1247                         QKeyEvent ev(QEvent::KeyPress, key, Qt::NoModifier, commit_string[i]);
1248                         keyPressEvent(&ev);
1249                 }
1250         }
1251
1252         // Hide the cursor during the kana-kanji transformation.
1253         if (preedit_string.empty())
1254                 startBlinkingCursor();
1255         else
1256                 stopBlinkingCursor();
1257
1258         // last_width : for checking if last preedit string was/wasn't empty.
1259         // FIXME THREAD && FIXME
1260         // We could have more than one work area, right?
1261         static bool last_width = false;
1262         if (!last_width && preedit_string.empty()) {
1263                 // if last_width is last length of preedit string.
1264                 e->accept();
1265                 return;
1266         }
1267
1268         GuiPainter pain(d->screen_, pixelRatio());
1269         d->buffer_view_->updateMetrics();
1270         d->buffer_view_->draw(pain);
1271         // FIXME: shall we use real_current_font here? (see #10478)
1272         FontInfo font = d->buffer_view_->cursor().getFont().fontInfo();
1273         FontMetrics const & fm = theFontMetrics(font);
1274         int height = fm.maxHeight();
1275         int cur_x = d->cursor_->rect().left();
1276         int cur_y = d->cursor_->rect().bottom();
1277
1278         // redraw area of preedit string.
1279         update(0, cur_y - height, viewport()->width(),
1280                 (height + 1) * d->preedit_lines_);
1281
1282         if (preedit_string.empty()) {
1283                 last_width = false;
1284                 d->preedit_lines_ = 1;
1285                 e->accept();
1286                 return;
1287         }
1288         last_width = true;
1289
1290         // att : stores an IM attribute.
1291         QList<QInputMethodEvent::Attribute> const & att = e->attributes();
1292
1293         // get attributes of input method cursor.
1294         // cursor_pos : cursor position in preedit string.
1295         size_t cursor_pos = 0;
1296         bool cursor_is_visible = false;
1297         for (int i = 0; i != att.size(); ++i) {
1298                 if (att.at(i).type == QInputMethodEvent::Cursor) {
1299                         cursor_pos = att.at(i).start;
1300                         cursor_is_visible = att.at(i).length != 0;
1301                         break;
1302                 }
1303         }
1304
1305         size_t preedit_length = preedit_string.length();
1306
1307         // get position of selection in input method.
1308         // FIXME: isn't there a way to do this simplier?
1309         // rStart : cursor position in selected string in IM.
1310         size_t rStart = 0;
1311         // rLength : selected string length in IM.
1312         size_t rLength = 0;
1313         if (cursor_pos < preedit_length) {
1314                 for (int i = 0; i != att.size(); ++i) {
1315                         if (att.at(i).type == QInputMethodEvent::TextFormat) {
1316                                 if (att.at(i).start <= int(cursor_pos)
1317                                         && int(cursor_pos) < att.at(i).start + att.at(i).length) {
1318                                                 rStart = att.at(i).start;
1319                                                 rLength = att.at(i).length;
1320                                                 if (!cursor_is_visible)
1321                                                         cursor_pos += rLength;
1322                                                 break;
1323                                 }
1324                         }
1325                 }
1326         }
1327         else {
1328                 rStart = cursor_pos;
1329                 rLength = 0;
1330         }
1331
1332         int const right_margin = d->buffer_view_->rightMargin();
1333         Painter::preedit_style ps;
1334         // Most often there would be only one line:
1335         d->preedit_lines_ = 1;
1336         for (size_t pos = 0; pos != preedit_length; ++pos) {
1337                 char_type const typed_char = preedit_string[pos];
1338                 // reset preedit string style
1339                 ps = Painter::preedit_default;
1340
1341                 // if we reached the right extremity of the screen, go to next line.
1342                 if (cur_x + fm.width(typed_char) > viewport()->width() - right_margin) {
1343                         cur_x = right_margin;
1344                         cur_y += height + 1;
1345                         ++d->preedit_lines_;
1346                 }
1347                 // preedit strings are displayed with dashed underline
1348                 // and partial strings are displayed white on black indicating
1349                 // that we are in selecting mode in the input method.
1350                 // FIXME: rLength == preedit_length is not a changing condition
1351                 // FIXME: should be put out of the loop.
1352                 if (pos >= rStart
1353                         && pos < rStart + rLength
1354                         && !(cursor_pos < rLength && rLength == preedit_length))
1355                         ps = Painter::preedit_selecting;
1356
1357                 if (pos == cursor_pos
1358                         && (cursor_pos < rLength && rLength == preedit_length))
1359                         ps = Painter::preedit_cursor;
1360
1361                 // draw one character and update cur_x.
1362                 cur_x += pain.preeditText(cur_x, cur_y, typed_char, font, ps);
1363         }
1364
1365         // update the preedit string screen area.
1366         update(0, cur_y - d->preedit_lines_*height, viewport()->width(),
1367                 (height + 1) * d->preedit_lines_);
1368
1369         // Don't forget to accept the event!
1370         e->accept();
1371 }
1372
1373
1374 QVariant GuiWorkArea::inputMethodQuery(Qt::InputMethodQuery query) const
1375 {
1376         QRect cur_r(0, 0, 0, 0);
1377         switch (query) {
1378                 // this is the CJK-specific composition window position and
1379                 // the context menu position when the menu key is pressed.
1380                 case Qt::ImMicroFocus:
1381                         cur_r = d->cursor_->rect();
1382                         if (d->preedit_lines_ != 1)
1383                                 cur_r.moveLeft(10);
1384                         cur_r.moveBottom(cur_r.bottom()
1385                                 + cur_r.height() * (d->preedit_lines_ - 1));
1386                         // return lower right of cursor in LyX.
1387                         return cur_r;
1388                 default:
1389                         return QWidget::inputMethodQuery(query);
1390         }
1391 }
1392
1393
1394 void GuiWorkArea::updateWindowTitle()
1395 {
1396         Buffer const & buf = bufferView().buffer();
1397         if (buf.fileName() != d->file_name_
1398             || buf.hasReadonlyFlag() != d->read_only_
1399             || buf.lyxvc().vcstatus() != d->vc_status_
1400             || buf.isClean() != d->clean_
1401             || buf.notifiesExternalModification() != d->externally_modified_) {
1402                 d->file_name_ = buf.fileName();
1403                 d->read_only_ = buf.hasReadonlyFlag();
1404                 d->vc_status_ = buf.lyxvc().vcstatus();
1405                 d->clean_ = buf.isClean();
1406                 d->externally_modified_ = buf.notifiesExternalModification();
1407                 Q_EMIT titleChanged(this);
1408         }
1409 }
1410
1411
1412 bool GuiWorkArea::isFullScreen() const
1413 {
1414         return d->lyx_view_ && d->lyx_view_->isFullScreen();
1415 }
1416
1417
1418 void GuiWorkArea::scheduleRedraw()
1419 {
1420         d->schedule_redraw_ = true;
1421 }
1422
1423
1424 bool GuiWorkArea::inDialogMode() const
1425 {
1426         return d->dialog_mode_;
1427 }
1428
1429
1430 void GuiWorkArea::setDialogMode(bool mode)
1431 {
1432         d->dialog_mode_ = mode;
1433 }
1434
1435
1436 GuiCompleter & GuiWorkArea::completer()
1437 {
1438         return *d->completer_;
1439 }
1440
1441 GuiView const & GuiWorkArea::view() const
1442 {
1443         return *d->lyx_view_;
1444 }
1445
1446
1447 GuiView & GuiWorkArea::view()
1448 {
1449         return *d->lyx_view_;
1450 }
1451
1452 ////////////////////////////////////////////////////////////////////
1453 //
1454 // EmbeddedWorkArea
1455 //
1456 ////////////////////////////////////////////////////////////////////
1457
1458
1459 EmbeddedWorkArea::EmbeddedWorkArea(QWidget * w): GuiWorkArea(w)
1460 {
1461         support::TempFile tempfile("embedded.internal");
1462         tempfile.setAutoRemove(false);
1463         buffer_ = theBufferList().newInternalBuffer(tempfile.name().absFileName());
1464         buffer_->setUnnamed(true);
1465         buffer_->setFullyLoaded(true);
1466         setBuffer(*buffer_);
1467         setDialogMode(true);
1468 }
1469
1470
1471 EmbeddedWorkArea::~EmbeddedWorkArea()
1472 {
1473         // No need to destroy buffer and bufferview here, because it is done
1474         // in theBufferList() destruction loop at application exit
1475 }
1476
1477
1478 void EmbeddedWorkArea::closeEvent(QCloseEvent * ev)
1479 {
1480         disable();
1481         GuiWorkArea::closeEvent(ev);
1482 }
1483
1484
1485 void EmbeddedWorkArea::hideEvent(QHideEvent * ev)
1486 {
1487         disable();
1488         GuiWorkArea::hideEvent(ev);
1489 }
1490
1491
1492 QSize EmbeddedWorkArea::sizeHint () const
1493 {
1494         // FIXME(?):
1495         // GuiWorkArea sets the size to the screen's viewport
1496         // by returning a value this gets overridden
1497         // EmbeddedWorkArea is now sized to fit in the layout
1498         // of the parent, and has a minimum size set in GuiWorkArea
1499         // which is what we return here
1500         return QSize(100, 70);
1501 }
1502
1503
1504 void EmbeddedWorkArea::disable()
1505 {
1506         stopBlinkingCursor();
1507         if (view().currentWorkArea() != this)
1508                 return;
1509         // No problem if currentMainWorkArea() is 0 (setCurrentWorkArea()
1510         // tolerates it and shows the background logo), what happens if
1511         // an EmbeddedWorkArea is closed after closing all document WAs
1512         view().setCurrentWorkArea(view().currentMainWorkArea());
1513 }
1514
1515 ////////////////////////////////////////////////////////////////////
1516 //
1517 // TabWorkArea
1518 //
1519 ////////////////////////////////////////////////////////////////////
1520
1521 #ifdef Q_OS_MAC
1522 class NoTabFrameMacStyle : public QProxyStyle {
1523 public:
1524         ///
1525         QRect subElementRect(SubElement element, const QStyleOption * option,
1526                              const QWidget * widget = 0) const
1527         {
1528                 QRect rect = QProxyStyle::subElementRect(element, option, widget);
1529                 bool noBar = static_cast<QTabWidget const *>(widget)->count() <= 1;
1530
1531                 // The Qt Mac style puts the contents into a 3 pixel wide box
1532                 // which looks very ugly and not like other Mac applications.
1533                 // Hence we remove this here, and moreover the 16 pixel round
1534                 // frame above if the tab bar is hidden.
1535                 if (element == QStyle::SE_TabWidgetTabContents) {
1536                         rect.adjust(- rect.left(), 0, rect.left(), 0);
1537                         if (noBar)
1538                                 rect.setTop(0);
1539                 }
1540
1541                 return rect;
1542         }
1543 };
1544
1545 NoTabFrameMacStyle noTabFrameMacStyle;
1546 #endif
1547
1548
1549 TabWorkArea::TabWorkArea(QWidget * parent)
1550         : QTabWidget(parent), clicked_tab_(-1), midpressed_tab_(-1)
1551 {
1552 #ifdef Q_OS_MAC
1553         setStyle(&noTabFrameMacStyle);
1554 #endif
1555
1556         QPalette pal = palette();
1557         pal.setColor(QPalette::Active, QPalette::Button,
1558                 pal.color(QPalette::Active, QPalette::Window));
1559         pal.setColor(QPalette::Disabled, QPalette::Button,
1560                 pal.color(QPalette::Disabled, QPalette::Window));
1561         pal.setColor(QPalette::Inactive, QPalette::Button,
1562                 pal.color(QPalette::Inactive, QPalette::Window));
1563
1564         QObject::connect(this, SIGNAL(currentChanged(int)),
1565                 this, SLOT(on_currentTabChanged(int)));
1566
1567         closeBufferButton = new QToolButton(this);
1568         closeBufferButton->setPalette(pal);
1569         // FIXME: rename the icon to closebuffer.png
1570         closeBufferButton->setIcon(QIcon(getPixmap("images/", "closetab", "svgz,png")));
1571         closeBufferButton->setText("Close File");
1572         closeBufferButton->setAutoRaise(true);
1573         closeBufferButton->setCursor(Qt::ArrowCursor);
1574         closeBufferButton->setToolTip(qt_("Close File"));
1575         closeBufferButton->setEnabled(true);
1576         QObject::connect(closeBufferButton, SIGNAL(clicked()),
1577                 this, SLOT(closeCurrentBuffer()));
1578         setCornerWidget(closeBufferButton, Qt::TopRightCorner);
1579
1580         // setup drag'n'drop
1581         QTabBar* tb = new DragTabBar;
1582         connect(tb, SIGNAL(tabMoveRequested(int, int)),
1583                 this, SLOT(moveTab(int, int)));
1584         tb->setElideMode(Qt::ElideNone);
1585         setTabBar(tb);
1586
1587         // make us responsible for the context menu of the tabbar
1588         tb->setContextMenuPolicy(Qt::CustomContextMenu);
1589         connect(tb, SIGNAL(customContextMenuRequested(const QPoint &)),
1590                 this, SLOT(showContextMenu(const QPoint &)));
1591         connect(tb, SIGNAL(tabCloseRequested(int)),
1592                 this, SLOT(closeTab(int)));
1593
1594         setUsesScrollButtons(true);
1595 }
1596
1597
1598 void TabWorkArea::mousePressEvent(QMouseEvent *me)
1599 {
1600         if (me->button() == Qt::MidButton)
1601                 midpressed_tab_ = tabBar()->tabAt(me->pos());
1602         else
1603                 QTabWidget::mousePressEvent(me);
1604 }
1605
1606
1607 void TabWorkArea::mouseReleaseEvent(QMouseEvent *me)
1608 {
1609         if (me->button() == Qt::MidButton) {
1610                 int const midreleased_tab = tabBar()->tabAt(me->pos());
1611                 if (midpressed_tab_ == midreleased_tab && posIsTab(me->pos()))
1612                         closeTab(midreleased_tab);
1613         } else
1614                 QTabWidget::mouseReleaseEvent(me);
1615 }
1616
1617
1618 void TabWorkArea::paintEvent(QPaintEvent * event)
1619 {
1620         if (tabBar()->isVisible()) {
1621                 QTabWidget::paintEvent(event);
1622         } else {
1623                 // Prevent the selected tab to influence the
1624                 // painting of the frame of the tab widget.
1625                 // This is needed for gtk style in Qt.
1626                 QStylePainter p(this);
1627 #if QT_VERSION < 0x050000
1628                 QStyleOptionTabWidgetFrameV2 opt;
1629 #else
1630                 QStyleOptionTabWidgetFrame opt;
1631 #endif
1632                 initStyleOption(&opt);
1633                 opt.rect = style()->subElementRect(QStyle::SE_TabWidgetTabPane,
1634                         &opt, this);
1635                 opt.selectedTabRect = QRect();
1636                 p.drawPrimitive(QStyle::PE_FrameTabWidget, opt);
1637         }
1638 }
1639
1640
1641 bool TabWorkArea::posIsTab(QPoint position)
1642 {
1643         // tabAt returns -1 if tab does not covers position
1644         return tabBar()->tabAt(position) > -1;
1645 }
1646
1647
1648 void TabWorkArea::mouseDoubleClickEvent(QMouseEvent * event)
1649 {
1650         if (event->button() != Qt::LeftButton)
1651                 return;
1652
1653         // this code chunk is unnecessary because it seems the event only makes
1654         // it this far if it is not on a tab. I'm not sure why this is (maybe
1655         // it is handled and ended in DragTabBar?), and thus I'm not sure if
1656         // this is true in all cases and if it will be true in the future so I
1657         // leave this code for now. (skostysh, 2016-07-21)
1658         //
1659         // return early if double click on existing tabs
1660         if (posIsTab(event->pos()))
1661                 return;
1662
1663         dispatch(FuncRequest(LFUN_BUFFER_NEW));
1664 }
1665
1666
1667 void TabWorkArea::setFullScreen(bool full_screen)
1668 {
1669         for (int i = 0; i != count(); ++i) {
1670                 if (GuiWorkArea * wa = workArea(i))
1671                         wa->setFullScreen(full_screen);
1672         }
1673
1674         if (lyxrc.full_screen_tabbar)
1675                 showBar(!full_screen && count() > 1);
1676         else
1677                 showBar(count() > 1);
1678 }
1679
1680
1681 void TabWorkArea::showBar(bool show)
1682 {
1683         tabBar()->setEnabled(show);
1684         tabBar()->setVisible(show);
1685         closeBufferButton->setVisible(show && lyxrc.single_close_tab_button);
1686         setTabsClosable(!lyxrc.single_close_tab_button);
1687 }
1688
1689
1690 GuiWorkAreaContainer * TabWorkArea::widget(int index) const
1691 {
1692         QWidget * w = QTabWidget::widget(index);
1693         if (!w)
1694                 return nullptr;
1695         GuiWorkAreaContainer * wac = dynamic_cast<GuiWorkAreaContainer *>(w);
1696         LATTEST(wac);
1697         return wac;
1698 }
1699
1700
1701 GuiWorkAreaContainer * TabWorkArea::currentWidget() const
1702 {
1703         return widget(currentIndex());
1704 }
1705
1706
1707 GuiWorkArea * TabWorkArea::workArea(int index) const
1708 {
1709         GuiWorkAreaContainer * w = widget(index);
1710         if (!w)
1711                 return nullptr;
1712         return w->workArea();
1713 }
1714
1715
1716 GuiWorkArea * TabWorkArea::currentWorkArea() const
1717 {
1718         return workArea(currentIndex());
1719 }
1720
1721
1722 GuiWorkArea * TabWorkArea::workArea(Buffer & buffer) const
1723 {
1724         // FIXME: this method doesn't work if we have more than one work area
1725         // showing the same buffer.
1726         for (int i = 0; i != count(); ++i) {
1727                 GuiWorkArea * wa = workArea(i);
1728                 LASSERT(wa, return 0);
1729                 if (&wa->bufferView().buffer() == &buffer)
1730                         return wa;
1731         }
1732         return 0;
1733 }
1734
1735
1736 void TabWorkArea::closeAll()
1737 {
1738         while (count()) {
1739                 QWidget * wac = widget(0);
1740                 LASSERT(wac, return);
1741                 removeTab(0);
1742                 delete wac;
1743         }
1744 }
1745
1746
1747 int TabWorkArea::indexOfWorkArea(GuiWorkArea * w) const
1748 {
1749         for (int index = 0; index < count(); ++index)
1750                 if (workArea(index) == w)
1751                         return index;
1752         return -1;
1753 }
1754
1755
1756 bool TabWorkArea::setCurrentWorkArea(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         if (index == currentIndex())
1764                 // Make sure the work area is up to date.
1765                 on_currentTabChanged(index);
1766         else
1767                 // Switch to the work area.
1768                 setCurrentIndex(index);
1769         work_area->setFocus();
1770
1771         return true;
1772 }
1773
1774
1775 GuiWorkArea * TabWorkArea::addWorkArea(Buffer & buffer, GuiView & view)
1776 {
1777         GuiWorkArea * wa = new GuiWorkArea(buffer, view);
1778         GuiWorkAreaContainer * wac = new GuiWorkAreaContainer(wa);
1779         wa->setUpdatesEnabled(false);
1780         // Hide tabbar if there's no tab (avoid a resize and a flashing tabbar
1781         // when hiding it again below).
1782         if (!(currentWorkArea() && currentWorkArea()->isFullScreen()))
1783                 showBar(count() > 0);
1784         addTab(wac, wa->windowTitle());
1785         QObject::connect(wa, SIGNAL(titleChanged(GuiWorkArea *)),
1786                 this, SLOT(updateTabTexts()));
1787         if (currentWorkArea() && currentWorkArea()->isFullScreen())
1788                 setFullScreen(true);
1789         else
1790                 // Hide tabbar if there's only one tab.
1791                 showBar(count() > 1);
1792
1793         updateTabTexts();
1794
1795         return wa;
1796 }
1797
1798
1799 bool TabWorkArea::removeWorkArea(GuiWorkArea * work_area)
1800 {
1801         LASSERT(work_area, return false);
1802         int index = indexOfWorkArea(work_area);
1803         if (index == -1)
1804                 return false;
1805
1806         work_area->setUpdatesEnabled(false);
1807         QWidget * wac = widget(index);
1808         removeTab(index);
1809         delete wac;
1810
1811         if (count()) {
1812                 // make sure the next work area is enabled.
1813                 currentWidget()->setUpdatesEnabled(true);
1814                 if (currentWorkArea() && currentWorkArea()->isFullScreen())
1815                         setFullScreen(true);
1816                 else
1817                         // Show tabbar only if there's more than one tab.
1818                         showBar(count() > 1);
1819         } else
1820                 lastWorkAreaRemoved();
1821
1822         updateTabTexts();
1823
1824         return true;
1825 }
1826
1827
1828 void TabWorkArea::on_currentTabChanged(int i)
1829 {
1830         // returns e.g. on application destruction
1831         if (i == -1)
1832                 return;
1833         GuiWorkArea * wa = workArea(i);
1834         LASSERT(wa, return);
1835         wa->setUpdatesEnabled(true);
1836         wa->redraw(true);
1837         wa->setFocus();
1838         ///
1839         currentWorkAreaChanged(wa);
1840
1841         LYXERR(Debug::GUI, "currentTabChanged " << i
1842                 << " File: " << wa->bufferView().buffer().absFileName());
1843 }
1844
1845
1846 void TabWorkArea::closeCurrentBuffer()
1847 {
1848         GuiWorkArea * wa;
1849         if (clicked_tab_ == -1)
1850                 wa = currentWorkArea();
1851         else {
1852                 wa = workArea(clicked_tab_);
1853                 LASSERT(wa, return);
1854         }
1855         wa->view().closeWorkArea(wa);
1856 }
1857
1858
1859 void TabWorkArea::hideCurrentTab()
1860 {
1861         GuiWorkArea * wa;
1862         if (clicked_tab_ == -1)
1863                 wa = currentWorkArea();
1864         else {
1865                 wa = workArea(clicked_tab_);
1866                 LASSERT(wa, return);
1867         }
1868         wa->view().hideWorkArea(wa);
1869 }
1870
1871
1872 void TabWorkArea::closeTab(int index)
1873 {
1874         on_currentTabChanged(index);
1875         GuiWorkArea * wa;
1876         if (index == -1)
1877                 wa = currentWorkArea();
1878         else {
1879                 wa = workArea(index);
1880                 LASSERT(wa, return);
1881         }
1882         wa->view().closeWorkArea(wa);
1883 }
1884
1885
1886 ///
1887 class DisplayPath {
1888 public:
1889         /// make vector happy
1890         DisplayPath() : tab_(-1), dottedPrefix_(false) {}
1891         ///
1892         DisplayPath(int tab, FileName const & filename)
1893                 : tab_(tab)
1894         {
1895                 filename_ = (filename.extension() == "lyx") ?
1896                         toqstr(filename.onlyFileNameWithoutExt())
1897                         : toqstr(filename.onlyFileName());
1898                 postfix_ = toqstr(filename.absoluteFilePath()).
1899                         split("/", QString::SkipEmptyParts);
1900                 postfix_.pop_back();
1901                 abs_ = toqstr(filename.absoluteFilePath());
1902                 dottedPrefix_ = false;
1903         }
1904
1905         /// Absolute path for debugging.
1906         QString abs() const
1907         {
1908                 return abs_;
1909         }
1910         /// Add the first segment from the postfix or three dots to the prefix.
1911         /// Merge multiple dot tripples. In fact dots are added lazily, i.e. only
1912         /// when really needed.
1913         void shiftPathSegment(bool dotted)
1914         {
1915                 if (postfix_.count() <= 0)
1916                         return;
1917
1918                 if (!dotted) {
1919                         if (dottedPrefix_ && !prefix_.isEmpty())
1920                                 prefix_ += ellipsisSlash_;
1921                         prefix_ += postfix_.front() + "/";
1922                 }
1923                 dottedPrefix_ = dotted && !prefix_.isEmpty();
1924                 postfix_.pop_front();
1925         }
1926         ///
1927         QString displayString() const
1928         {
1929                 if (prefix_.isEmpty())
1930                         return filename_;
1931
1932                 bool dots = dottedPrefix_ || !postfix_.isEmpty();
1933                 return prefix_ + (dots ? ellipsisSlash_ : "") + filename_;
1934         }
1935         ///
1936         QString forecastPathString() const
1937         {
1938                 if (postfix_.count() == 0)
1939                         return displayString();
1940
1941                 return prefix_
1942                         + (dottedPrefix_ ? ellipsisSlash_ : "")
1943                         + postfix_.front() + "/";
1944         }
1945         ///
1946         bool final() const { return postfix_.empty(); }
1947         ///
1948         int tab() const { return tab_; }
1949
1950 private:
1951         /// ".../"
1952         static QString const ellipsisSlash_;
1953         ///
1954         QString prefix_;
1955         ///
1956         QStringList postfix_;
1957         ///
1958         QString filename_;
1959         ///
1960         QString abs_;
1961         ///
1962         int tab_;
1963         ///
1964         bool dottedPrefix_;
1965 };
1966
1967
1968 QString const DisplayPath::ellipsisSlash_ = QString(QChar(0x2026)) + "/";
1969
1970
1971 ///
1972 bool operator<(DisplayPath const & a, DisplayPath const & b)
1973 {
1974         return a.displayString() < b.displayString();
1975 }
1976
1977 ///
1978 bool operator==(DisplayPath const & a, DisplayPath const & b)
1979 {
1980         return a.displayString() == b.displayString();
1981 }
1982
1983
1984 void TabWorkArea::updateTabTexts()
1985 {
1986         size_t n = count();
1987         if (n == 0)
1988                 return;
1989         std::list<DisplayPath> paths;
1990         typedef std::list<DisplayPath>::iterator It;
1991
1992         // collect full names first: path into postfix, empty prefix and
1993         // filename without extension
1994         for (size_t i = 0; i < n; ++i) {
1995                 GuiWorkArea * i_wa = workArea(i);
1996                 FileName const fn = i_wa->bufferView().buffer().fileName();
1997                 paths.push_back(DisplayPath(i, fn));
1998         }
1999
2000         // go through path segments and see if it helps to make the path more unique
2001         bool somethingChanged = true;
2002         bool allFinal = false;
2003         while (somethingChanged && !allFinal) {
2004                 // adding path segments changes order
2005                 paths.sort();
2006
2007                 LYXERR(Debug::GUI, "updateTabTexts() iteration start");
2008                 somethingChanged = false;
2009                 allFinal = true;
2010
2011                 // find segments which are not unique (i.e. non-atomic)
2012                 It it = paths.begin();
2013                 It segStart = it;
2014                 QString segString = it->displayString();
2015                 for (; it != paths.end(); ++it) {
2016                         // look to the next item
2017                         It next = it;
2018                         ++next;
2019
2020                         // final?
2021                         allFinal = allFinal && it->final();
2022
2023                         LYXERR(Debug::GUI, "it = " << it->abs()
2024                                << " => " << it->displayString());
2025
2026                         // still the same segment?
2027                         QString nextString;
2028                         if ((next != paths.end()
2029                              && (nextString = next->displayString()) == segString))
2030                                 continue;
2031                         LYXERR(Debug::GUI, "segment ended");
2032
2033                         // only a trivial one with one element?
2034                         if (it == segStart) {
2035                                 // start new segment
2036                                 segStart = next;
2037                                 segString = nextString;
2038                                 continue;
2039                         }
2040
2041                         // We found a non-atomic segment
2042                         // We know that segStart <= it < next <= paths.end().
2043                         // The assertion below tells coverity about it.
2044                         LATTEST(segStart != paths.end());
2045                         QString dspString = segStart->forecastPathString();
2046                         LYXERR(Debug::GUI, "first forecast found for "
2047                                << segStart->abs() << " => " << dspString);
2048                         It sit = segStart;
2049                         ++sit;
2050                         // Shift path segments and hope for the best
2051                         // that it makes the path more unique.
2052                         somethingChanged = true;
2053                         bool moreUnique = false;
2054                         for (; sit != next; ++sit) {
2055                                 if (sit->forecastPathString() != dspString) {
2056                                         LYXERR(Debug::GUI, "different forecast found for "
2057                                                 << sit->abs() << " => " << sit->forecastPathString());
2058                                         moreUnique = true;
2059                                         break;
2060                                 }
2061                                 LYXERR(Debug::GUI, "same forecast found for "
2062                                         << sit->abs() << " => " << dspString);
2063                         }
2064
2065                         // if the path segment helped, add it. Otherwise add dots
2066                         bool dots = !moreUnique;
2067                         LYXERR(Debug::GUI, "using dots = " << dots);
2068                         for (sit = segStart; sit != next; ++sit) {
2069                                 sit->shiftPathSegment(dots);
2070                                 LYXERR(Debug::GUI, "shifting "
2071                                         << sit->abs() << " => " << sit->displayString());
2072                         }
2073
2074                         // start new segment
2075                         segStart = next;
2076                         segString = nextString;
2077                 }
2078         }
2079
2080         // set new tab titles
2081         for (It it = paths.begin(); it != paths.end(); ++it) {
2082                 int const tab_index = it->tab();
2083                 Buffer const & buf = workArea(tab_index)->bufferView().buffer();
2084                 QString tab_text = it->displayString().replace("&", "&&");
2085                 if (!buf.fileName().empty() && !buf.isClean())
2086                         tab_text += "*";
2087                 QString tab_tooltip = it->abs();
2088                 if (buf.hasReadonlyFlag()) {
2089                         setTabIcon(tab_index, QIcon(getPixmap("images/", "emblem-readonly", "svgz,png")));
2090                         tab_tooltip = qt_("%1 (read only)").arg(tab_tooltip);
2091                 } else
2092                         setTabIcon(tab_index, QIcon());
2093                 if (buf.notifiesExternalModification()) {
2094                         QString const warn = qt_("%1 (modified externally)");
2095                         tab_tooltip = warn.arg(tab_tooltip);
2096                         tab_text += QChar(0x26a0);
2097                 }
2098                 setTabText(tab_index, tab_text);
2099                 setTabToolTip(tab_index, tab_tooltip);
2100         }
2101 }
2102
2103
2104 void TabWorkArea::showContextMenu(const QPoint & pos)
2105 {
2106         // which tab?
2107         clicked_tab_ = static_cast<DragTabBar *>(tabBar())->tabAt(pos);
2108         if (clicked_tab_ == -1)
2109                 return;
2110
2111         // show tab popup
2112         QMenu popup;
2113         popup.addAction(QIcon(getPixmap("images/", "hidetab", "svgz,png")),
2114                 qt_("Hide tab"), this, SLOT(hideCurrentTab()));
2115         popup.addAction(QIcon(getPixmap("images/", "closetab", "svgz,png")),
2116                 qt_("Close tab"), this, SLOT(closeCurrentBuffer()));
2117         popup.exec(tabBar()->mapToGlobal(pos));
2118
2119         clicked_tab_ = -1;
2120 }
2121
2122
2123 void TabWorkArea::moveTab(int fromIndex, int toIndex)
2124 {
2125         QWidget * w = widget(fromIndex);
2126         QIcon icon = tabIcon(fromIndex);
2127         QString text = tabText(fromIndex);
2128
2129         setCurrentIndex(fromIndex);
2130         removeTab(fromIndex);
2131         insertTab(toIndex, w, icon, text);
2132         setCurrentIndex(toIndex);
2133 }
2134
2135
2136 DragTabBar::DragTabBar(QWidget* parent)
2137         : QTabBar(parent)
2138 {
2139         setAcceptDrops(true);
2140         setTabsClosable(!lyxrc.single_close_tab_button);
2141 }
2142
2143
2144 void DragTabBar::mousePressEvent(QMouseEvent * event)
2145 {
2146         if (event->button() == Qt::LeftButton)
2147                 dragStartPos_ = event->pos();
2148         QTabBar::mousePressEvent(event);
2149 }
2150
2151
2152 void DragTabBar::mouseMoveEvent(QMouseEvent * event)
2153 {
2154         // If the left button isn't pressed anymore then return
2155         if (!(event->buttons() & Qt::LeftButton))
2156                 return;
2157
2158         // If the distance is too small then return
2159         if ((event->pos() - dragStartPos_).manhattanLength()
2160             < QApplication::startDragDistance())
2161                 return;
2162
2163         // did we hit something after all?
2164         int tab = tabAt(dragStartPos_);
2165         if (tab == -1)
2166                 return;
2167
2168         // simulate button release to remove highlight from button
2169         int i = currentIndex();
2170         QMouseEvent me(QEvent::MouseButtonRelease, dragStartPos_,
2171                 event->button(), event->buttons(), 0);
2172         QTabBar::mouseReleaseEvent(&me);
2173         setCurrentIndex(i);
2174
2175         // initiate Drag
2176         QDrag * drag = new QDrag(this);
2177         QMimeData * mimeData = new QMimeData;
2178         // a crude way to distinguish tab-reodering drops from other ones
2179         mimeData->setData("action", "tab-reordering") ;
2180         drag->setMimeData(mimeData);
2181
2182         // get tab pixmap as cursor
2183         QRect r = tabRect(tab);
2184         QPixmap pixmap(r.size());
2185         render(&pixmap, - r.topLeft());
2186         drag->setPixmap(pixmap);
2187         drag->exec();
2188 }
2189
2190
2191 void DragTabBar::dragEnterEvent(QDragEnterEvent * event)
2192 {
2193         // Only accept if it's an tab-reordering request
2194         QMimeData const * m = event->mimeData();
2195         QStringList formats = m->formats();
2196         if (formats.contains("action")
2197             && m->data("action") == "tab-reordering")
2198                 event->acceptProposedAction();
2199 }
2200
2201
2202 void DragTabBar::dropEvent(QDropEvent * event)
2203 {
2204         int fromIndex = tabAt(dragStartPos_);
2205         int toIndex = tabAt(event->pos());
2206
2207         // Tell interested objects that
2208         if (fromIndex != toIndex)
2209                 tabMoveRequested(fromIndex, toIndex);
2210         event->acceptProposedAction();
2211 }
2212
2213
2214 GuiWorkAreaContainer::GuiWorkAreaContainer(GuiWorkArea * wa, QWidget * parent)
2215         : QWidget(parent), wa_(wa)
2216 {
2217         LASSERT(wa, return);
2218         Ui::WorkAreaUi::setupUi(this);
2219         layout()->addWidget(wa);
2220         connect(wa, SIGNAL(titleChanged(GuiWorkArea *)),
2221                 this, SLOT(updateDisplay()));
2222         connect(reloadPB, SIGNAL(clicked()), this, SLOT(reload()));
2223         connect(ignorePB, SIGNAL(clicked()), this, SLOT(ignore()));
2224         setMessageColour({notificationFrame}, {reloadPB, ignorePB});
2225         updateDisplay();
2226 }
2227
2228
2229 void GuiWorkAreaContainer::updateDisplay()
2230 {
2231         Buffer const & buf = wa_->bufferView().buffer();
2232         notificationFrame->setHidden(!buf.notifiesExternalModification());
2233         QString const label = qt_("<b>The file %1 changed on disk.</b>")
2234                 .arg(toqstr(buf.fileName().displayName()));
2235         externalModificationLabel->setText(label);
2236 }
2237
2238
2239 void GuiWorkAreaContainer::dispatch(FuncRequest f) const
2240 {
2241         lyx::dispatch(FuncRequest(LFUN_BUFFER_SWITCH,
2242                                   wa_->bufferView().buffer().absFileName()));
2243         lyx::dispatch(f);
2244 }
2245
2246
2247 void GuiWorkAreaContainer::reload() const
2248 {
2249         dispatch(FuncRequest(LFUN_BUFFER_RELOAD));
2250 }
2251
2252
2253 void GuiWorkAreaContainer::ignore() const
2254 {
2255         dispatch(FuncRequest(LFUN_BUFFER_EXTERNAL_MODIFICATION_CLEAR));
2256 }
2257
2258
2259 void GuiWorkAreaContainer::mouseDoubleClickEvent(QMouseEvent * event)
2260 {
2261         // prevent TabWorkArea from opening a new buffer on double click
2262         event->accept();
2263 }
2264
2265
2266 } // namespace frontend
2267 } // namespace lyx
2268
2269 #include "moc_GuiWorkArea.cpp"