src/frontends/qt4/GuiWorkArea.cpp

   1 /**
   2  * \file GuiWorkArea.cpp
   3  * This file is part of LyX, the document processor.
   4  * Licence details can be found in the file COPYING.
   5  *
   6  * \author John Levon
   7  * \author Abdelrazak Younes
   8  *
   9  * Full author contact details are available in file CREDITS.
  10  */
  11
  12 #include <config.h>
  13
  14 #include "GuiWorkArea.h"
  15 #include "GuiWorkArea_Private.h"
  16
  17 #include "ColorCache.h"
  18 #include "FontLoader.h"
  19 #include "GuiApplication.h"
  20 #include "GuiCompleter.h"
  21 #include "GuiKeySymbol.h"
  22 #include "GuiPainter.h"
  23 #include "GuiView.h"
  24 #include "Menus.h"
  25
  26 #include "Buffer.h"
  27 #include "BufferList.h"
  28 #include "BufferParams.h"
  29 #include "BufferView.h"
  30 #include "CoordCache.h"
  31 #include "Cursor.h"
  32 #include "Font.h"
  33 #include "FuncRequest.h"
  34 #include "KeySymbol.h"
  35 #include "Language.h"
  36 #include "LyX.h"
  37 #include "LyXRC.h"
  38 #include "LyXVC.h"
  39 #include "qt_helpers.h"
  40 #include "Text.h"
  41 #include "TextMetrics.h"
  42 #include "version.h"
  43
  44 #include "graphics/GraphicsImage.h"
  45 #include "graphics/GraphicsLoader.h"
  46
  47 #include "support/convert.h"
  48 #include "support/debug.h"
  49 #include "support/gettext.h"
  50 #include "support/lassert.h"
  51 #include "support/TempFile.h"
  52
  53 #include "frontends/Application.h"
  54 #include "frontends/FontMetrics.h"
  55 #include "frontends/WorkAreaManager.h"
  56
  57 #include <QContextMenuEvent>
  58 #if (QT_VERSION < 0x050000)
  59 #include <QInputContext>
  60 #endif
  61 #include <QDrag>
  62 #include <QHelpEvent>
  63 #ifdef Q_OS_MAC
  64 #include <QProxyStyle>
  65 #endif
  66 #include <QMainWindow>
  67 #include <QMimeData>
  68 #include <QMenu>
  69 #include <QPainter>
  70 #include <QPalette>
  71 #include <QPixmapCache>
  72 #include <QScrollBar>
  73 #include <QStyleOption>
  74 #include <QStylePainter>
  75 #include <QTimer>
  76 #include <QToolButton>
  77 #include <QToolTip>
  78 #include <QMenuBar>
  79
  80 #include "support/bind.h"
  81
  82 #include <cmath>
  83 #include <iostream>
  84
  85 int const TabIndicatorWidth = 3;
  86
  87 #undef KeyPress
  88 #undef NoModifier
  89
  90 using namespace std;
  91 using namespace lyx::support;
  92
  93 namespace lyx {
  94
  95
  96 /// return the LyX mouse button state from Qt's
  97 static mouse_button::state q_button_state(Qt::MouseButton button)
  98 {
  99         mouse_button::state b = mouse_button::none;
 100         switch (button) {
 101                 case Qt::LeftButton:
 102                         b = mouse_button::button1;
 103                         break;
 104                 case Qt::MidButton:
 105                         b = mouse_button::button2;
 106                         break;
 107                 case Qt::RightButton:
 108                         b = mouse_button::button3;
 109                         break;
 110                 default:
 111                         break;
 112         }
 113         return b;
 114 }
 115
 116
 117 /// return the LyX mouse button state from Qt's
 118 mouse_button::state q_motion_state(Qt::MouseButtons state)
 119 {
 120         mouse_button::state b = mouse_button::none;
 121         if (state & Qt::LeftButton)
 122                 b |= mouse_button::button1;
 123         if (state & Qt::MidButton)
 124                 b |= mouse_button::button2;
 125         if (state & Qt::RightButton)
 126                 b |= mouse_button::button3;
 127         return b;
 128 }
 129
 130
 131 namespace frontend {
 132
 133 class CursorWidget {
 134 public:
 135         CursorWidget() : rtl_(false), l_shape_(false), completable_(false),
 136                 show_(false), x_(0), cursor_width_(0)
 137         {
 138                 recomputeWidth();
 139         }
 140
 141         void draw(QPainter & painter)
 142         {
 143                 if (!show_ || !rect_.isValid())
 144                         return;
 145
 146                 int y = rect_.top();
 147                 int l = x_ - rect_.left();
 148                 int r = rect_.right() - x_;
 149                 int bot = rect_.bottom();
 150
 151                 // draw vertical line
 152                 painter.fillRect(x_, y, cursor_width_, rect_.height(), color_);
 153
 154                 // draw RTL/LTR indication
 155                 painter.setPen(color_);
 156                 if (l_shape_) {
 157                         if (rtl_)
 158                                 painter.drawLine(x_, bot, x_ - l, bot);
 159                         else
 160                                 painter.drawLine(x_, bot, x_ + cursor_width_ + r, bot);
 161                 }
 162
 163                 // draw completion triangle
 164                 if (completable_) {
 165                         int m = y + rect_.height() / 2;
 166                         int d = TabIndicatorWidth - 1;
 167                         if (rtl_) {
 168                                 painter.drawLine(x_ - 1, m - d, x_ - 1 - d, m);
 169                                 painter.drawLine(x_ - 1, m + d, x_ - 1 - d, m);
 170                         } else {
 171                                 painter.drawLine(x_ + cursor_width_, m - d, x_ + cursor_width_ + d, m);
 172                                 painter.drawLine(x_ + cursor_width_, m + d, x_ + cursor_width_ + d, m);
 173                         }
 174                 }
 175         }
 176
 177         void update(int x, int y, int h, bool l_shape,
 178                 bool rtl, bool completable)
 179         {
 180                 color_ = guiApp->colorCache().get(Color_cursor);
 181                 l_shape_ = l_shape;
 182                 rtl_ = rtl;
 183                 completable_ = completable;
 184                 x_ = x;
 185
 186                 // extension to left and right
 187                 int l = 0;
 188                 int r = 0;
 189
 190                 // RTL/LTR indication
 191                 if (l_shape_) {
 192                         if (rtl)
 193                                 l += h / 3;
 194                         else
 195                                 r += h / 3;
 196                 }
 197
 198                 // completion triangle
 199                 if (completable_) {
 200                         if (rtl)
 201                                 l = max(l, TabIndicatorWidth);
 202                         else
 203                                 r = max(r, TabIndicatorWidth);
 204                 }
 205
 206                 // compute overall rectangle
 207                 rect_ = QRect(x - l, y, cursor_width_ + r + l, h);
 208         }
 209
 210         void show(bool set_show = true) { show_ = set_show; }
 211         void hide() { show_ = false; }
 212         int cursorWidth() const { return cursor_width_; }
 213         void recomputeWidth() {
 214                 cursor_width_ = lyxrc.cursor_width
 215                         ? lyxrc.cursor_width
 216                         : 1 + int((lyxrc.currentZoom + 50) / 200.0);
 217         }
 218
 219         QRect const & rect() { return rect_; }
 220
 221 private:
 222         /// cursor is in RTL or LTR text
 223         bool rtl_;
 224         /// indication for RTL or LTR
 225         bool l_shape_;
 226         /// triangle to show that a completion is available
 227         bool completable_;
 228         ///
 229         bool show_;
 230         ///
 231         QColor color_;
 232         /// rectangle, possibly with l_shape and completion triangle
 233         QRect rect_;
 234         /// x position (were the vertical line is drawn)
 235         int x_;
 236
 237         int cursor_width_;
 238 };
 239
 240
 241 // This is a 'heartbeat' generating synthetic mouse move events when the
 242 // cursor is at the top or bottom edge of the viewport. One scroll per 0.2 s
 243 SyntheticMouseEvent::SyntheticMouseEvent()
 244         : timeout(200), restart_timeout(true)
 245 {}
 246
 247
 248 GuiWorkArea::Private::Private(GuiWorkArea * parent)
 249 : p(parent), buffer_view_(0), lyx_view_(0),
 250   cursor_visible_(false), cursor_(0),
 251   need_resize_(false), schedule_redraw_(false), preedit_lines_(1),
 252   pixel_ratio_(1.0),
 253   completer_(new GuiCompleter(p, p)), dialog_mode_(false), shell_escape_(false),
 254   read_only_(false), clean_(true), externally_modified_(false)
 255 {
 256 }
 257
 258
 259 GuiWorkArea::GuiWorkArea(QWidget * /* w */)
 260 : d(new Private(this))
 261 {
 262         new CompressorProxy(this); // not a leak
 263 }
 264
 265
 266 GuiWorkArea::GuiWorkArea(Buffer & buffer, GuiView & gv)
 267 : d(new Private(this))
 268 {
 269         new CompressorProxy(this); // not a leak
 270         setGuiView(gv);
 271         buffer.params().display_pixel_ratio = theGuiApp()->pixelRatio();
 272         setBuffer(buffer);
 273         init();
 274 }
 275
 276
 277 double GuiWorkArea::pixelRatio() const
 278 {
 279 #if QT_VERSION >= 0x050000
 280         return qt_scale_factor * devicePixelRatio();
 281 #else
 282         return 1.0;
 283 #endif
 284 }
 285
 286
 287 void GuiWorkArea::init()
 288 {
 289         // Setup the signals
 290         connect(&d->cursor_timeout_, SIGNAL(timeout()),
 291                 this, SLOT(toggleCursor()));
 292
 293         int const time = QApplication::cursorFlashTime() / 2;
 294         if (time > 0) {
 295                 d->cursor_timeout_.setInterval(time);
 296                 d->cursor_timeout_.start();
 297         } else {
 298                 // let's initialize this just to be safe
 299                 d->cursor_timeout_.setInterval(500);
 300         }
 301
 302         // With Qt4.5 a mouse event will happen before the first paint event
 303         // so make sure that the buffer view has an up to date metrics.
 304         d->buffer_view_->resize(viewport()->width(), viewport()->height());
 305         d->cursor_ = new frontend::CursorWidget();
 306         d->cursor_->hide();
 307
 308         setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 309         setAcceptDrops(true);
 310         setMouseTracking(true);
 311         setMinimumSize(100, 70);
 312         setFrameStyle(QFrame::NoFrame);
 313         updateWindowTitle();
 314
 315         //viewport()->setAutoFillBackground(false);
 316         // We don't need double-buffering nor SystemBackground on
 317         // the viewport because we have our own backing pixmap.
 318         //viewport()->setAttribute(Qt::WA_NoSystemBackground);
 319         viewport()->setAttribute(Qt::WA_OpaquePaintEvent);
 320
 321         setFocusPolicy(Qt::StrongFocus);
 322
 323         d->setCursorShape(Qt::IBeamCursor);
 324
 325         // This connection is closed at the same time as this is destroyed.
 326         d->synthetic_mouse_event_.timeout.timeout.connect([this](){
 327                         generateSyntheticMouseEvent();
 328                 });
 329
 330         LYXERR(Debug::GUI, "viewport width: " << viewport()->width()
 331                 << "  viewport height: " << viewport()->height());
 332
 333         // Enables input methods for asian languages.
 334         // Must be set when creating custom text editing widgets.
 335         setAttribute(Qt::WA_InputMethodEnabled, true);
 336
 337         d->dialog_mode_ = false;
 338 }
 339
 340
 341 GuiWorkArea::~GuiWorkArea()
 342 {
 343         // If something is wrong with the buffer, we can ignore it safely
 344         try {
 345                 d->buffer_view_->buffer().workAreaManager().remove(this);
 346         } catch(...) {}
 347         delete d->buffer_view_;
 348         delete d->cursor_;
 349         // Completer has a QObject parent and is thus automatically destroyed.
 350         // See #4758.
 351         // delete completer_;
 352         delete d;
 353 }
 354
 355
 356 Qt::CursorShape GuiWorkArea::cursorShape() const
 357 {
 358         return viewport()->cursor().shape();
 359 }
 360
 361
 362 void GuiWorkArea::Private::setCursorShape(Qt::CursorShape shape)
 363 {
 364         p->viewport()->setCursor(shape);
 365 }
 366
 367
 368 void GuiWorkArea::Private::updateCursorShape()
 369 {
 370         setCursorShape(buffer_view_->clickableInset()
 371                 ? Qt::PointingHandCursor : Qt::IBeamCursor);
 372 }
 373
 374
 375 void GuiWorkArea::setGuiView(GuiView & gv)
 376 {
 377         d->lyx_view_ = &gv;
 378 }
 379
 380
 381 void GuiWorkArea::setBuffer(Buffer & buffer)
 382 {
 383         delete d->buffer_view_;
 384         d->buffer_view_ = new BufferView(buffer);
 385         buffer.workAreaManager().add(this);
 386
 387         // HACK: Prevents an additional redraw when the scrollbar pops up
 388         // which regularily happens on documents with more than one page.
 389         // The policy  should be set to "Qt::ScrollBarAsNeeded" soon.
 390         // Since we have no geometry information yet, we assume that
 391         // a document needs a scrollbar if there is more then four
 392         // paragraph in the outermost text.
 393         if (buffer.text().paragraphs().size() > 4)
 394                 setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
 395         QTimer::singleShot(50, this, SLOT(fixVerticalScrollBar()));
 396         Q_EMIT bufferViewChanged();
 397 }
 398
 399
 400 void GuiWorkArea::fixVerticalScrollBar()
 401 {
 402         if (!isFullScreen())
 403                 setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
 404 }
 405
 406
 407 void GuiWorkArea::close()
 408 {
 409         d->lyx_view_->removeWorkArea(this);
 410 }
 411
 412
 413 void GuiWorkArea::setFullScreen(bool full_screen)
 414 {
 415         d->buffer_view_->setFullScreen(full_screen);
 416         setFrameStyle(QFrame::NoFrame);
 417         if (full_screen) {
 418                 setFrameStyle(QFrame::NoFrame);
 419                 if (lyxrc.full_screen_scrollbar)
 420                         setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 421         } else
 422                 setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
 423 }
 424
 425
 426 BufferView & GuiWorkArea::bufferView()
 427 {
 428         return *d->buffer_view_;
 429 }
 430
 431
 432 BufferView const & GuiWorkArea::bufferView() const
 433 {
 434         return *d->buffer_view_;
 435 }
 436
 437
 438 void GuiWorkArea::stopBlinkingCursor()
 439 {
 440         d->cursor_timeout_.stop();
 441         d->hideCursor();
 442 }
 443
 444
 445 void GuiWorkArea::startBlinkingCursor()
 446 {
 447         // do not show the cursor if the view is busy
 448         if (view().busy())
 449                 return;
 450
 451         Point p;
 452         int h = 0;
 453         d->buffer_view_->cursorPosAndHeight(p, h);
 454         // Don't start blinking if the cursor isn't on screen.
 455         if (!d->buffer_view_->cursorInView(p, h))
 456                 return;
 457
 458         d->showCursor();
 459
 460         //we're not supposed to cache this value.
 461         int const time = QApplication::cursorFlashTime() / 2;
 462         if (time <= 0)
 463                 return;
 464         d->cursor_timeout_.setInterval(time);
 465         d->cursor_timeout_.start();
 466 }
 467
 468
 469 void GuiWorkArea::redraw(bool update_metrics)
 470 {
 471         if (!isVisible())
 472                 // No need to redraw in this case.
 473                 return;
 474
 475         // No need to do anything if this is the current view. The BufferView
 476         // metrics are already up to date.
 477         if (update_metrics || d->lyx_view_ != guiApp->currentView()
 478                 || d->lyx_view_->currentWorkArea() != this) {
 479                 // FIXME: it would be nice to optimize for the off-screen case.
 480                 d->buffer_view_->cursor().fixIfBroken();
 481                 d->buffer_view_->updateMetrics();
 482                 d->buffer_view_->cursor().fixIfBroken();
 483         }
 484
 485         // update cursor position, because otherwise it has to wait until
 486         // the blinking interval is over
 487         if (d->cursor_visible_) {
 488                 d->hideCursor();
 489                 d->showCursor();
 490         }
 491
 492         LYXERR(Debug::WORKAREA, "WorkArea::redraw screen");
 493         viewport()->update();
 494
 495         /// \warning: scrollbar updating *must* be done after the BufferView is drawn
 496         /// because \c BufferView::updateScrollbar() is called in \c BufferView::draw().
 497         d->updateScrollbar();
 498         d->lyx_view_->updateStatusBar();
 499
 500         if (lyxerr.debugging(Debug::WORKAREA))
 501                 d->buffer_view_->coordCache().dump();
 502
 503         updateWindowTitle();
 504
 505         d->updateCursorShape();
 506 }
 507
 508
 509 // Keep in sync with GuiWorkArea::processKeySym below
 510 bool GuiWorkArea::queryKeySym(KeySymbol const & key, KeyModifier mod) const
 511 {
 512         return guiApp->queryKeySym(key, mod);
 513 }
 514
 515
 516 // Keep in sync with GuiWorkArea::queryKeySym above
 517 void GuiWorkArea::processKeySym(KeySymbol const & key, KeyModifier mod)
 518 {
 519         if (d->lyx_view_->isFullScreen() && d->lyx_view_->menuBar()->isVisible()
 520                 && lyxrc.full_screen_menubar) {
 521                 // FIXME HACK: we should not have to do this here. See related comment
 522                 // in GuiView::event() (QEvent::ShortcutOverride)
 523                 d->lyx_view_->menuBar()->hide();
 524         }
 525
 526         // In order to avoid bad surprise in the middle of an operation,
 527         // we better stop the blinking cursor...
 528         // the cursor gets restarted in GuiView::restartCursor()
 529         stopBlinkingCursor();
 530         guiApp->processKeySym(key, mod);
 531 }
 532
 533
 534 void GuiWorkArea::Private::dispatch(FuncRequest const & cmd)
 535 {
 536         // Handle drag&drop
 537         if (cmd.action() == LFUN_FILE_OPEN) {
 538                 DispatchResult dr;
 539                 lyx_view_->dispatch(cmd, dr);
 540                 return;
 541         }
 542
 543         bool const notJustMovingTheMouse =
 544                 cmd.action() != LFUN_MOUSE_MOTION || cmd.button() != mouse_button::none;
 545
 546         // In order to avoid bad surprise in the middle of an operation, we better stop
 547         // the blinking cursor.
 548         if (notJustMovingTheMouse)
 549                 p->stopBlinkingCursor();
 550
 551         buffer_view_->mouseEventDispatch(cmd);
 552
 553         // Skip these when selecting
 554         // FIXME: let GuiView take care of those.
 555         if (cmd.action() != LFUN_MOUSE_MOTION) {
 556                 completer_->updateVisibility(false, false);
 557                 lyx_view_->updateDialogs();
 558                 lyx_view_->updateStatusBar();
 559         }
 560
 561         // GUI tweaks except with mouse motion with no button pressed.
 562         if (notJustMovingTheMouse) {
 563                 // Slight hack: this is only called currently when we
 564                 // clicked somewhere, so we force through the display
 565                 // of the new status here.
 566                 // FIXME: let GuiView take care of those.
 567                 lyx_view_->clearMessage();
 568
 569                 // Show the cursor immediately after any operation
 570                 p->startBlinkingCursor();
 571         }
 572
 573         updateCursorShape();
 574 }
 575
 576
 577 void GuiWorkArea::Private::resizeBufferView()
 578 {
 579         // WARNING: Please don't put any code that will trigger a repaint here!
 580         // We are already inside a paint event.
 581         p->stopBlinkingCursor();
 582         // Warn our container (GuiView).
 583         p->busy(true);
 584
 585         Point point;
 586         int h = 0;
 587         buffer_view_->cursorPosAndHeight(point, h);
 588         bool const cursor_in_view = buffer_view_->cursorInView(point, h);
 589         buffer_view_->resize(p->viewport()->width(), p->viewport()->height());
 590         if (cursor_in_view)
 591                 buffer_view_->scrollToCursor();
 592         p->viewport()->update();
 593
 594         // Update scrollbars which might have changed due different
 595         // BufferView dimension. This is especially important when the
 596         // BufferView goes from zero-size to the real-size for the first time,
 597         // as the scrollbar paramters are then set for the first time.
 598         updateScrollbar();
 599
 600         need_resize_ = false;
 601         p->busy(false);
 602         // Eventually, restart the cursor after the resize event.
 603         // We might be resizing even if the focus is on another widget so we only
 604         // restart the cursor if we have the focus.
 605         if (p->hasFocus())
 606                 QTimer::singleShot(50, p, SLOT(startBlinkingCursor()));
 607 }
 608
 609
 610 void GuiWorkArea::Private::showCursor()
 611 {
 612         if (cursor_visible_)
 613                 return;
 614
 615         Point p;
 616         int h = 0;
 617         buffer_view_->cursorPosAndHeight(p, h);
 618         if (!buffer_view_->cursorInView(p, h))
 619                 return;
 620
 621         // RTL or not RTL
 622         bool l_shape = false;
 623         Font const & realfont = buffer_view_->cursor().real_current_font;
 624         BufferParams const & bp = buffer_view_->buffer().params();
 625         bool const samelang = realfont.language() == bp.language;
 626         bool const isrtl = realfont.isVisibleRightToLeft();
 627
 628         if (!samelang || isrtl != bp.language->rightToLeft())
 629                 l_shape = true;
 630
 631         // The ERT language hack needs fixing up
 632         if (realfont.language() == latex_language)
 633                 l_shape = false;
 634
 635         // show cursor on screen
 636         Cursor & cur = buffer_view_->cursor();
 637         bool completable = cur.inset().showCompletionCursor()
 638                 && completer_->completionAvailable()
 639                 && !completer_->popupVisible()
 640                 && !completer_->inlineVisible();
 641         cursor_visible_ = true;
 642         cursor_->recomputeWidth();
 643
 644         //int cur_x = buffer_view_->getPos(cur).x_;
 645         // We may have decided to slide the cursor row so that cursor
 646         // is visible.
 647         p.x_ -= buffer_view_->horizScrollOffset();
 648
 649         showCursor(p.x_, p.y_, h, l_shape, isrtl, completable);
 650 }
 651
 652
 653 void GuiWorkArea::Private::hideCursor()
 654 {
 655         if (!cursor_visible_)
 656                 return;
 657
 658         cursor_visible_ = false;
 659         removeCursor();
 660 }
 661
 662
 663 void GuiWorkArea::toggleCursor()
 664 {
 665         if (d->cursor_visible_)
 666                 d->hideCursor();
 667         else
 668                 d->showCursor();
 669 }
 670
 671
 672 void GuiWorkArea::Private::updateScrollbar()
 673 {
 674         // Prevent setRange() and setSliderPosition from causing recursive calls via
 675         // the signal valueChanged. (#10311)
 676         QObject::disconnect(p->verticalScrollBar(), SIGNAL(valueChanged(int)),
 677                             p, SLOT(scrollTo(int)));
 678         ScrollbarParameters const & scroll_ = buffer_view_->scrollbarParameters();
 679         p->verticalScrollBar()->setRange(scroll_.min, scroll_.max);
 680         p->verticalScrollBar()->setPageStep(scroll_.page_step);
 681         p->verticalScrollBar()->setSingleStep(scroll_.single_step);
 682         p->verticalScrollBar()->setSliderPosition(0);
 683         // Connect to the vertical scroll bar
 684         QObject::connect(p->verticalScrollBar(), SIGNAL(valueChanged(int)),
 685                          p, SLOT(scrollTo(int)));
 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                 e->accept();
 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                 e->accept();
 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 how to handle math.
1008         Text * text = cur.text();
1009         if (!text)
1010                 return;
1011         TextMetrics const & tm = d->buffer_view_->textMetrics(text);
1012
1013         // Quit gracefully if there are no metrics, since otherwise next
1014         // line would crash (bug #10324).
1015         // This situation seems related to a (not yet understood) timing problem.
1016         if (tm.empty())
1017                 return;
1018
1019         pair<pit_type, const ParagraphMetrics *> pp = up ? tm.first() : tm.last();
1020         ParagraphMetrics const & pm = *pp.second;
1021         pit_type const pit = pp.first;
1022
1023         if (pm.rows().empty())
1024                 return;
1025
1026         // Find the row at which we set the cursor.
1027         RowList::const_iterator rit = pm.rows().begin();
1028         RowList::const_iterator rlast = pm.rows().end();
1029         int yy = pm.position() - pm.ascent();
1030         for (--rlast; rit != rlast; ++rit) {
1031                 int h = rit->height();
1032                 if ((up && yy + h > 0)
1033                           || (!up && yy + h > wh - defaultRowHeight()))
1034                         break;
1035                 yy += h;
1036         }
1037
1038         // Find the position of the cursor
1039         bool bound;
1040         int x = d->synthetic_mouse_event_.cmd.x();
1041         pos_type const pos = tm.getPosNearX(*rit, x, bound);
1042
1043         // Set the cursor
1044         cur.pit() = pit;
1045         cur.pos() = pos;
1046         cur.boundary(bound);
1047
1048         d->buffer_view_->buffer().changed(false);
1049         return;
1050 }
1051
1052
1053 // CompressorProxy adapted from Kuba Ober https://stackoverflow.com/a/21006207
1054 CompressorProxy::CompressorProxy(GuiWorkArea * wa) : QObject(wa), flag_(false)
1055 {
1056         qRegisterMetaType<KeySymbol>("KeySymbol");
1057         qRegisterMetaType<KeyModifier>("KeyModifier");
1058         connect(wa, SIGNAL(compressKeySym(KeySymbol, KeyModifier, bool)),
1059                 this, SLOT(slot(KeySymbol, KeyModifier, bool)),
1060                 Qt::QueuedConnection);
1061         connect(this, SIGNAL(signal(KeySymbol, KeyModifier)),
1062                 wa, SLOT(processKeySym(KeySymbol, KeyModifier)));
1063 }
1064
1065
1066 bool CompressorProxy::emitCheck(bool isAutoRepeat)
1067 {
1068         flag_ = true;
1069         if (isAutoRepeat)
1070                 QCoreApplication::sendPostedEvents(this, QEvent::MetaCall); // recurse
1071         bool result = flag_;
1072         flag_ = false;
1073         return result;
1074 }
1075
1076
1077 void CompressorProxy::slot(KeySymbol sym, KeyModifier mod, bool isAutoRepeat)
1078 {
1079         if (emitCheck(isAutoRepeat))
1080                 Q_EMIT signal(sym, mod);
1081         else
1082                 LYXERR(Debug::KEY, "system is busy: autoRepeat key event ignored");
1083 }
1084
1085
1086 void GuiWorkArea::keyPressEvent(QKeyEvent * ev)
1087 {
1088         // this is also called for ShortcutOverride events. In this case, one must
1089         // not act but simply accept the event explicitly.
1090         bool const act = (ev->type() != QEvent::ShortcutOverride);
1091
1092         // Do not process here some keys if dialog_mode_ is set
1093         bool const for_dialog_mode = d->dialog_mode_
1094                 && (ev->modifiers() == Qt::NoModifier
1095                     || ev->modifiers() == Qt::ShiftModifier)
1096                 && (ev->key() == Qt::Key_Escape
1097                     || ev->key() == Qt::Key_Enter
1098                     || ev->key() == Qt::Key_Return);
1099         // also do not use autoRepeat to input shortcuts
1100         bool const autoRepeat = ev->isAutoRepeat();
1101
1102         if (for_dialog_mode || (!act && autoRepeat)) {
1103                 ev->ignore();
1104                 return;
1105         }
1106
1107         // intercept some keys if completion popup is visible
1108         if (d->completer_->popupVisible()) {
1109                 switch (ev->key()) {
1110                 case Qt::Key_Enter:
1111                 case Qt::Key_Return:
1112                         if (act)
1113                                 d->completer_->activate();
1114                         ev->accept();
1115                         return;
1116                 }
1117         }
1118
1119         KeyModifier const m = q_key_state(ev->modifiers());
1120
1121         if (act && lyxerr.debugging(Debug::KEY)) {
1122                 std::string str;
1123                 if (m & ShiftModifier)
1124                         str += "Shift-";
1125                 if (m & ControlModifier)
1126                         str += "Control-";
1127                 if (m & AltModifier)
1128                         str += "Alt-";
1129                 if (m & MetaModifier)
1130                         str += "Meta-";
1131                 LYXERR(Debug::KEY, " count: " << ev->count() << " text: " << ev->text()
1132                        << " isAutoRepeat: " << ev->isAutoRepeat() << " key: " << ev->key()
1133                        << " keyState: " << str);
1134         }
1135
1136         KeySymbol sym;
1137         setKeySymbol(&sym, ev);
1138         if (sym.isOK()) {
1139                 if (act) {
1140                         Q_EMIT compressKeySym(sym, m, autoRepeat);
1141                         ev->accept();
1142                 } else
1143                         // here, !autoRepeat, as determined at the beginning
1144                         ev->setAccepted(queryKeySym(sym, m));
1145         } else {
1146                 ev->ignore();
1147         }
1148 }
1149
1150
1151 void GuiWorkArea::doubleClickTimeout()
1152 {
1153         d->dc_event_.active = false;
1154 }
1155
1156
1157 void GuiWorkArea::mouseDoubleClickEvent(QMouseEvent * ev)
1158 {
1159         d->dc_event_ = DoubleClick(ev);
1160         QTimer::singleShot(QApplication::doubleClickInterval(), this,
1161                         SLOT(doubleClickTimeout()));
1162         FuncRequest cmd(LFUN_MOUSE_DOUBLE, ev->x(), ev->y(),
1163                         q_button_state(ev->button()), q_key_state(ev->modifiers()));
1164         d->dispatch(cmd);
1165         ev->accept();
1166 }
1167
1168
1169 void GuiWorkArea::resizeEvent(QResizeEvent * ev)
1170 {
1171         QAbstractScrollArea::resizeEvent(ev);
1172         d->need_resize_ = true;
1173         ev->accept();
1174 }
1175
1176
1177 void GuiWorkArea::paintEvent(QPaintEvent * ev)
1178 {
1179         // LYXERR(Debug::PAINTING, "paintEvent begin: x: " << rc.x()
1180         //      << " y: " << rc.y() << " w: " << rc.width() << " h: " << rc.height());
1181
1182         if (d->needResize()) {
1183                 d->resizeBufferView();
1184                 if (d->cursor_visible_) {
1185                         d->hideCursor();
1186                         d->showCursor();
1187                 }
1188         }
1189
1190         GuiPainter pain(viewport(), pixelRatio());
1191         d->buffer_view_->draw(pain);
1192
1193         d->cursor_->draw(pain);
1194         ev->accept();
1195 }
1196
1197
1198 void GuiWorkArea::Private::showCursor(int x, int y, int h,
1199         bool l_shape, bool rtl, bool completable)
1200 {
1201         if (schedule_redraw_) {
1202                 // This happens when a graphic conversion is finished. As we don't know
1203                 // the size of the new graphics, it's better the update everything.
1204                 // We can't use redraw() here because this would trigger a infinite
1205                 // recursive loop with showCursor().
1206                 buffer_view_->resize(p->viewport()->width(), p->viewport()->height());
1207                 p->viewport()->update();
1208                 updateScrollbar();
1209                 schedule_redraw_ = false;
1210                 // Show the cursor immediately after the update.
1211                 hideCursor();
1212                 p->toggleCursor();
1213                 return;
1214         }
1215
1216         cursor_->update(x, y, h, l_shape, rtl, completable);
1217         cursor_->show();
1218         p->viewport()->update(cursor_->rect());
1219 }
1220
1221
1222 void GuiWorkArea::Private::removeCursor()
1223 {
1224         cursor_->hide();
1225         //if (!qApp->focusWidget())
1226                 p->viewport()->update(cursor_->rect());
1227 }
1228
1229
1230 void GuiWorkArea::inputMethodEvent(QInputMethodEvent * e)
1231 {
1232 //FIXME Broken Feature !!
1233 // I do not think that we are supposed to paint inside this event. Shall we
1234 // just let TextMetrics::breakRow add this to the relevant Row object?
1235 #if 0
1236         QString const & commit_string = e->commitString();
1237         docstring const & preedit_string
1238                 = qstring_to_ucs4(e->preeditString());
1239
1240         if (!commit_string.isEmpty()) {
1241
1242                 LYXERR(Debug::KEY, "preeditString: " << e->preeditString()
1243                         << " commitString: " << e->commitString());
1244
1245                 int key = 0;
1246
1247                 // FIXME Iwami 04/01/07: we should take care also of UTF16 surrogates here.
1248                 for (int i = 0; i != commit_string.size(); ++i) {
1249                         QKeyEvent ev(QEvent::KeyPress, key, Qt::NoModifier, commit_string[i]);
1250                         keyPressEvent(&ev);
1251                 }
1252         }
1253
1254         // Hide the cursor during the kana-kanji transformation.
1255         if (preedit_string.empty())
1256                 startBlinkingCursor();
1257         else
1258                 stopBlinkingCursor();
1259
1260         // last_width : for checking if last preedit string was/wasn't empty.
1261         // FIXME THREAD && FIXME
1262         // We could have more than one work area, right?
1263         static bool last_width = false;
1264         if (!last_width && preedit_string.empty()) {
1265                 // if last_width is last length of preedit string.
1266                 e->accept();
1267                 return;
1268         }
1269
1270         d->buffer_view_->updateMetrics();
1271         viewport()->update();
1272         // FIXME: shall we use real_current_font here? (see #10478)
1273         FontInfo font = d->buffer_view_->cursor().getFont().fontInfo();
1274         FontMetrics const & fm = theFontMetrics(font);
1275         int height = fm.maxHeight();
1276         int cur_x = d->cursor_->rect().left();
1277         int cur_y = d->cursor_->rect().bottom();
1278
1279         // redraw area of preedit string.
1280         viewport()->update(0, cur_y - height, viewport()->width(),
1281                 (height + 1) * d->preedit_lines_);
1282
1283         if (preedit_string.empty()) {
1284                 last_width = false;
1285                 d->preedit_lines_ = 1;
1286                 e->accept();
1287                 return;
1288         }
1289         last_width = true;
1290
1291         // att : stores an IM attribute.
1292         QList<QInputMethodEvent::Attribute> const & att = e->attributes();
1293
1294         // get attributes of input method cursor.
1295         // cursor_pos : cursor position in preedit string.
1296         size_t cursor_pos = 0;
1297         bool cursor_is_visible = false;
1298         for (int i = 0; i != att.size(); ++i) {
1299                 if (att.at(i).type == QInputMethodEvent::Cursor) {
1300                         cursor_pos = att.at(i).start;
1301                         cursor_is_visible = att.at(i).length != 0;
1302                         break;
1303                 }
1304         }
1305
1306         size_t preedit_length = preedit_string.length();
1307
1308         // get position of selection in input method.
1309         // FIXME: isn't there a way to do this simplier?
1310         // rStart : cursor position in selected string in IM.
1311         size_t rStart = 0;
1312         // rLength : selected string length in IM.
1313         size_t rLength = 0;
1314         if (cursor_pos < preedit_length) {
1315                 for (int i = 0; i != att.size(); ++i) {
1316                         if (att.at(i).type == QInputMethodEvent::TextFormat) {
1317                                 if (att.at(i).start <= int(cursor_pos)
1318                                         && int(cursor_pos) < att.at(i).start + att.at(i).length) {
1319                                                 rStart = att.at(i).start;
1320                                                 rLength = att.at(i).length;
1321                                                 if (!cursor_is_visible)
1322                                                         cursor_pos += rLength;
1323                                                 break;
1324                                 }
1325                         }
1326                 }
1327         }
1328         else {
1329                 rStart = cursor_pos;
1330                 rLength = 0;
1331         }
1332
1333         int const right_margin = d->buffer_view_->rightMargin();
1334         Painter::preedit_style ps;
1335         // Most often there would be only one line:
1336         d->preedit_lines_ = 1;
1337         for (size_t pos = 0; pos != preedit_length; ++pos) {
1338                 char_type const typed_char = preedit_string[pos];
1339                 // reset preedit string style
1340                 ps = Painter::preedit_default;
1341
1342                 // if we reached the right extremity of the screen, go to next line.
1343                 if (cur_x + fm.width(typed_char) > viewport()->width() - right_margin) {
1344                         cur_x = right_margin;
1345                         cur_y += height + 1;
1346                         ++d->preedit_lines_;
1347                 }
1348                 // preedit strings are displayed with dashed underline
1349                 // and partial strings are displayed white on black indicating
1350                 // that we are in selecting mode in the input method.
1351                 // FIXME: rLength == preedit_length is not a changing condition
1352                 // FIXME: should be put out of the loop.
1353                 if (pos >= rStart
1354                         && pos < rStart + rLength
1355                         && !(cursor_pos < rLength && rLength == preedit_length))
1356                         ps = Painter::preedit_selecting;
1357
1358                 if (pos == cursor_pos
1359                         && (cursor_pos < rLength && rLength == preedit_length))
1360                         ps = Painter::preedit_cursor;
1361
1362                 // draw one character and update cur_x.
1363                 GuiPainter pain(d->screen_, pixelRatio());
1364                 cur_x += pain.preeditText(cur_x, cur_y, typed_char, font, ps);
1365         }
1366
1367         // update the preedit string screen area.
1368         viewport()->update(0, cur_y - d->preedit_lines_*height, viewport()->width(),
1369                 (height + 1) * d->preedit_lines_);
1370 #endif
1371
1372         // Don't forget to accept the event!
1373         e->accept();
1374 }
1375
1376
1377 QVariant GuiWorkArea::inputMethodQuery(Qt::InputMethodQuery query) const
1378 {
1379         QRect cur_r(0, 0, 0, 0);
1380         switch (query) {
1381                 // this is the CJK-specific composition window position and
1382                 // the context menu position when the menu key is pressed.
1383                 case Qt::ImMicroFocus:
1384                         cur_r = d->cursor_->rect();
1385                         if (d->preedit_lines_ != 1)
1386                                 cur_r.moveLeft(10);
1387                         cur_r.moveBottom(cur_r.bottom()
1388                                 + cur_r.height() * (d->preedit_lines_ - 1));
1389                         // return lower right of cursor in LyX.
1390                         return cur_r;
1391                 default:
1392                         return QWidget::inputMethodQuery(query);
1393         }
1394 }
1395
1396
1397 void GuiWorkArea::updateWindowTitle()
1398 {
1399         Buffer const & buf = bufferView().buffer();
1400         if (buf.fileName() != d->file_name_
1401             || buf.params().shell_escape != d->shell_escape_
1402             || buf.hasReadonlyFlag() != d->read_only_
1403             || buf.lyxvc().vcstatus() != d->vc_status_
1404             || buf.isClean() != d->clean_
1405             || buf.notifiesExternalModification() != d->externally_modified_) {
1406                 d->file_name_ = buf.fileName();
1407                 d->shell_escape_ = buf.params().shell_escape;
1408                 d->read_only_ = buf.hasReadonlyFlag();
1409                 d->vc_status_ = buf.lyxvc().vcstatus();
1410                 d->clean_ = buf.isClean();
1411                 d->externally_modified_ = buf.notifiesExternalModification();
1412                 Q_EMIT titleChanged(this);
1413         }
1414 }
1415
1416
1417 bool GuiWorkArea::isFullScreen() const
1418 {
1419         return d->lyx_view_ && d->lyx_view_->isFullScreen();
1420 }
1421
1422
1423 void GuiWorkArea::scheduleRedraw()
1424 {
1425         d->schedule_redraw_ = true;
1426 }
1427
1428
1429 bool GuiWorkArea::inDialogMode() const
1430 {
1431         return d->dialog_mode_;
1432 }
1433
1434
1435 void GuiWorkArea::setDialogMode(bool mode)
1436 {
1437         d->dialog_mode_ = mode;
1438 }
1439
1440
1441 GuiCompleter & GuiWorkArea::completer()
1442 {
1443         return *d->completer_;
1444 }
1445
1446 GuiView const & GuiWorkArea::view() const
1447 {
1448         return *d->lyx_view_;
1449 }
1450
1451
1452 GuiView & GuiWorkArea::view()
1453 {
1454         return *d->lyx_view_;
1455 }
1456
1457 ////////////////////////////////////////////////////////////////////
1458 //
1459 // EmbeddedWorkArea
1460 //
1461 ////////////////////////////////////////////////////////////////////
1462
1463
1464 EmbeddedWorkArea::EmbeddedWorkArea(QWidget * w): GuiWorkArea(w)
1465 {
1466         support::TempFile tempfile("embedded.internal");
1467         tempfile.setAutoRemove(false);
1468         buffer_ = theBufferList().newInternalBuffer(tempfile.name().absFileName());
1469         buffer_->setUnnamed(true);
1470         buffer_->setFullyLoaded(true);
1471         setBuffer(*buffer_);
1472         setDialogMode(true);
1473 }
1474
1475
1476 EmbeddedWorkArea::~EmbeddedWorkArea()
1477 {
1478         // No need to destroy buffer and bufferview here, because it is done
1479         // in theBufferList() destruction loop at application exit
1480 }
1481
1482
1483 void EmbeddedWorkArea::closeEvent(QCloseEvent * ev)
1484 {
1485         disable();
1486         GuiWorkArea::closeEvent(ev);
1487 }
1488
1489
1490 void EmbeddedWorkArea::hideEvent(QHideEvent * ev)
1491 {
1492         disable();
1493         GuiWorkArea::hideEvent(ev);
1494 }
1495
1496
1497 QSize EmbeddedWorkArea::sizeHint () const
1498 {
1499         // FIXME(?):
1500         // GuiWorkArea sets the size to the screen's viewport
1501         // by returning a value this gets overridden
1502         // EmbeddedWorkArea is now sized to fit in the layout
1503         // of the parent, and has a minimum size set in GuiWorkArea
1504         // which is what we return here
1505         return QSize(100, 70);
1506 }
1507
1508
1509 void EmbeddedWorkArea::disable()
1510 {
1511         stopBlinkingCursor();
1512         if (view().currentWorkArea() != this)
1513                 return;
1514         // No problem if currentMainWorkArea() is 0 (setCurrentWorkArea()
1515         // tolerates it and shows the background logo), what happens if
1516         // an EmbeddedWorkArea is closed after closing all document WAs
1517         view().setCurrentWorkArea(view().currentMainWorkArea());
1518 }
1519
1520 ////////////////////////////////////////////////////////////////////
1521 //
1522 // TabWorkArea
1523 //
1524 ////////////////////////////////////////////////////////////////////
1525
1526 #ifdef Q_OS_MAC
1527 class NoTabFrameMacStyle : public QProxyStyle {
1528 public:
1529         ///
1530         QRect subElementRect(SubElement element, const QStyleOption * option,
1531                              const QWidget * widget = 0) const
1532         {
1533                 QRect rect = QProxyStyle::subElementRect(element, option, widget);
1534                 bool noBar = static_cast<QTabWidget const *>(widget)->count() <= 1;
1535
1536                 // The Qt Mac style puts the contents into a 3 pixel wide box
1537                 // which looks very ugly and not like other Mac applications.
1538                 // Hence we remove this here, and moreover the 16 pixel round
1539                 // frame above if the tab bar is hidden.
1540                 if (element == QStyle::SE_TabWidgetTabContents) {
1541                         rect.adjust(- rect.left(), 0, rect.left(), 0);
1542                         if (noBar)
1543                                 rect.setTop(0);
1544                 }
1545
1546                 return rect;
1547         }
1548 };
1549
1550 NoTabFrameMacStyle noTabFrameMacStyle;
1551 #endif
1552
1553
1554 TabWorkArea::TabWorkArea(QWidget * parent)
1555         : QTabWidget(parent), clicked_tab_(-1), midpressed_tab_(-1)
1556 {
1557 #ifdef Q_OS_MAC
1558         setStyle(&noTabFrameMacStyle);
1559 #endif
1560
1561         QPalette pal = palette();
1562         pal.setColor(QPalette::Active, QPalette::Button,
1563                 pal.color(QPalette::Active, QPalette::Window));
1564         pal.setColor(QPalette::Disabled, QPalette::Button,
1565                 pal.color(QPalette::Disabled, QPalette::Window));
1566         pal.setColor(QPalette::Inactive, QPalette::Button,
1567                 pal.color(QPalette::Inactive, QPalette::Window));
1568
1569         QObject::connect(this, SIGNAL(currentChanged(int)),
1570                 this, SLOT(on_currentTabChanged(int)));
1571
1572         closeBufferButton = new QToolButton(this);
1573         closeBufferButton->setPalette(pal);
1574         // FIXME: rename the icon to closebuffer.png
1575         closeBufferButton->setIcon(QIcon(getPixmap("images/", "closetab", "svgz,png")));
1576         closeBufferButton->setText("Close File");
1577         closeBufferButton->setAutoRaise(true);
1578         closeBufferButton->setCursor(Qt::ArrowCursor);
1579         closeBufferButton->setToolTip(qt_("Close File"));
1580         closeBufferButton->setEnabled(true);
1581         QObject::connect(closeBufferButton, SIGNAL(clicked()),
1582                 this, SLOT(closeCurrentBuffer()));
1583         setCornerWidget(closeBufferButton, Qt::TopRightCorner);
1584
1585         // setup drag'n'drop
1586         QTabBar* tb = new DragTabBar;
1587         connect(tb, SIGNAL(tabMoveRequested(int, int)),
1588                 this, SLOT(moveTab(int, int)));
1589         tb->setElideMode(Qt::ElideNone);
1590         setTabBar(tb);
1591
1592         // make us responsible for the context menu of the tabbar
1593         tb->setContextMenuPolicy(Qt::CustomContextMenu);
1594         connect(tb, SIGNAL(customContextMenuRequested(const QPoint &)),
1595                 this, SLOT(showContextMenu(const QPoint &)));
1596         connect(tb, SIGNAL(tabCloseRequested(int)),
1597                 this, SLOT(closeTab(int)));
1598
1599         setUsesScrollButtons(true);
1600 }
1601
1602
1603 void TabWorkArea::mousePressEvent(QMouseEvent *me)
1604 {
1605         if (me->button() == Qt::MidButton)
1606                 midpressed_tab_ = tabBar()->tabAt(me->pos());
1607         else
1608                 QTabWidget::mousePressEvent(me);
1609 }
1610
1611
1612 void TabWorkArea::mouseReleaseEvent(QMouseEvent *me)
1613 {
1614         if (me->button() == Qt::MidButton) {
1615                 int const midreleased_tab = tabBar()->tabAt(me->pos());
1616                 if (midpressed_tab_ == midreleased_tab && posIsTab(me->pos()))
1617                         closeTab(midreleased_tab);
1618         } else
1619                 QTabWidget::mouseReleaseEvent(me);
1620 }
1621
1622
1623 void TabWorkArea::paintEvent(QPaintEvent * event)
1624 {
1625         if (tabBar()->isVisible()) {
1626                 QTabWidget::paintEvent(event);
1627         } else {
1628                 // Prevent the selected tab to influence the
1629                 // painting of the frame of the tab widget.
1630                 // This is needed for gtk style in Qt.
1631                 QStylePainter p(this);
1632 #if QT_VERSION < 0x050000
1633                 QStyleOptionTabWidgetFrameV2 opt;
1634 #else
1635                 QStyleOptionTabWidgetFrame opt;
1636 #endif
1637                 initStyleOption(&opt);
1638                 opt.rect = style()->subElementRect(QStyle::SE_TabWidgetTabPane,
1639                         &opt, this);
1640                 opt.selectedTabRect = QRect();
1641                 p.drawPrimitive(QStyle::PE_FrameTabWidget, opt);
1642         }
1643 }
1644
1645
1646 bool TabWorkArea::posIsTab(QPoint position)
1647 {
1648         // tabAt returns -1 if tab does not covers position
1649         return tabBar()->tabAt(position) > -1;
1650 }
1651
1652
1653 void TabWorkArea::mouseDoubleClickEvent(QMouseEvent * event)
1654 {
1655         if (event->button() != Qt::LeftButton)
1656                 return;
1657
1658         // this code chunk is unnecessary because it seems the event only makes
1659         // it this far if it is not on a tab. I'm not sure why this is (maybe
1660         // it is handled and ended in DragTabBar?), and thus I'm not sure if
1661         // this is true in all cases and if it will be true in the future so I
1662         // leave this code for now. (skostysh, 2016-07-21)
1663         //
1664         // return early if double click on existing tabs
1665         if (posIsTab(event->pos()))
1666                 return;
1667
1668         dispatch(FuncRequest(LFUN_BUFFER_NEW));
1669 }
1670
1671
1672 void TabWorkArea::setFullScreen(bool full_screen)
1673 {
1674         for (int i = 0; i != count(); ++i) {
1675                 if (GuiWorkArea * wa = workArea(i))
1676                         wa->setFullScreen(full_screen);
1677         }
1678
1679         if (lyxrc.full_screen_tabbar)
1680                 showBar(!full_screen && count() > 1);
1681         else
1682                 showBar(count() > 1);
1683 }
1684
1685
1686 void TabWorkArea::showBar(bool show)
1687 {
1688         tabBar()->setEnabled(show);
1689         tabBar()->setVisible(show);
1690         closeBufferButton->setVisible(show && lyxrc.single_close_tab_button);
1691         setTabsClosable(!lyxrc.single_close_tab_button);
1692 }
1693
1694
1695 GuiWorkAreaContainer * TabWorkArea::widget(int index) const
1696 {
1697         QWidget * w = QTabWidget::widget(index);
1698         if (!w)
1699                 return nullptr;
1700         GuiWorkAreaContainer * wac = dynamic_cast<GuiWorkAreaContainer *>(w);
1701         LATTEST(wac);
1702         return wac;
1703 }
1704
1705
1706 GuiWorkAreaContainer * TabWorkArea::currentWidget() const
1707 {
1708         return widget(currentIndex());
1709 }
1710
1711
1712 GuiWorkArea * TabWorkArea::workArea(int index) const
1713 {
1714         GuiWorkAreaContainer * w = widget(index);
1715         if (!w)
1716                 return nullptr;
1717         return w->workArea();
1718 }
1719
1720
1721 GuiWorkArea * TabWorkArea::currentWorkArea() const
1722 {
1723         return workArea(currentIndex());
1724 }
1725
1726
1727 GuiWorkArea * TabWorkArea::workArea(Buffer & buffer) const
1728 {
1729         // FIXME: this method doesn't work if we have more than one work area
1730         // showing the same buffer.
1731         for (int i = 0; i != count(); ++i) {
1732                 GuiWorkArea * wa = workArea(i);
1733                 LASSERT(wa, return 0);
1734                 if (&wa->bufferView().buffer() == &buffer)
1735                         return wa;
1736         }
1737         return 0;
1738 }
1739
1740
1741 void TabWorkArea::closeAll()
1742 {
1743         while (count()) {
1744                 QWidget * wac = widget(0);
1745                 LASSERT(wac, return);
1746                 removeTab(0);
1747                 delete wac;
1748         }
1749 }
1750
1751
1752 int TabWorkArea::indexOfWorkArea(GuiWorkArea * w) const
1753 {
1754         for (int index = 0; index < count(); ++index)
1755                 if (workArea(index) == w)
1756                         return index;
1757         return -1;
1758 }
1759
1760
1761 bool TabWorkArea::setCurrentWorkArea(GuiWorkArea * work_area)
1762 {
1763         LASSERT(work_area, return false);
1764         int index = indexOfWorkArea(work_area);
1765         if (index == -1)
1766                 return false;
1767
1768         if (index == currentIndex())
1769                 // Make sure the work area is up to date.
1770                 on_currentTabChanged(index);
1771         else
1772                 // Switch to the work area.
1773                 setCurrentIndex(index);
1774         work_area->setFocus();
1775
1776         return true;
1777 }
1778
1779
1780 GuiWorkArea * TabWorkArea::addWorkArea(Buffer & buffer, GuiView & view)
1781 {
1782         GuiWorkArea * wa = new GuiWorkArea(buffer, view);
1783         GuiWorkAreaContainer * wac = new GuiWorkAreaContainer(wa);
1784         wa->setUpdatesEnabled(false);
1785         // Hide tabbar if there's no tab (avoid a resize and a flashing tabbar
1786         // when hiding it again below).
1787         if (!(currentWorkArea() && currentWorkArea()->isFullScreen()))
1788                 showBar(count() > 0);
1789         addTab(wac, wa->windowTitle());
1790         QObject::connect(wa, SIGNAL(titleChanged(GuiWorkArea *)),
1791                 this, SLOT(updateTabTexts()));
1792         if (currentWorkArea() && currentWorkArea()->isFullScreen())
1793                 setFullScreen(true);
1794         else
1795                 // Hide tabbar if there's only one tab.
1796                 showBar(count() > 1);
1797
1798         updateTabTexts();
1799
1800         return wa;
1801 }
1802
1803
1804 bool TabWorkArea::removeWorkArea(GuiWorkArea * work_area)
1805 {
1806         LASSERT(work_area, return false);
1807         int index = indexOfWorkArea(work_area);
1808         if (index == -1)
1809                 return false;
1810
1811         work_area->setUpdatesEnabled(false);
1812         QWidget * wac = widget(index);
1813         removeTab(index);
1814         delete wac;
1815
1816         if (count()) {
1817                 // make sure the next work area is enabled.
1818                 currentWidget()->setUpdatesEnabled(true);
1819                 if (currentWorkArea() && currentWorkArea()->isFullScreen())
1820                         setFullScreen(true);
1821                 else
1822                         // Show tabbar only if there's more than one tab.
1823                         showBar(count() > 1);
1824         } else
1825                 lastWorkAreaRemoved();
1826
1827         updateTabTexts();
1828
1829         return true;
1830 }
1831
1832
1833 void TabWorkArea::on_currentTabChanged(int i)
1834 {
1835         // returns e.g. on application destruction
1836         if (i == -1)
1837                 return;
1838         GuiWorkArea * wa = workArea(i);
1839         LASSERT(wa, return);
1840         wa->setUpdatesEnabled(true);
1841         wa->redraw(true);
1842         wa->setFocus();
1843         ///
1844         currentWorkAreaChanged(wa);
1845
1846         LYXERR(Debug::GUI, "currentTabChanged " << i
1847                 << " File: " << wa->bufferView().buffer().absFileName());
1848 }
1849
1850
1851 void TabWorkArea::closeCurrentBuffer()
1852 {
1853         GuiWorkArea * wa;
1854         if (clicked_tab_ == -1)
1855                 wa = currentWorkArea();
1856         else {
1857                 wa = workArea(clicked_tab_);
1858                 LASSERT(wa, return);
1859         }
1860         wa->view().closeWorkArea(wa);
1861 }
1862
1863
1864 void TabWorkArea::hideCurrentTab()
1865 {
1866         GuiWorkArea * wa;
1867         if (clicked_tab_ == -1)
1868                 wa = currentWorkArea();
1869         else {
1870                 wa = workArea(clicked_tab_);
1871                 LASSERT(wa, return);
1872         }
1873         wa->view().hideWorkArea(wa);
1874 }
1875
1876
1877 void TabWorkArea::closeTab(int index)
1878 {
1879         on_currentTabChanged(index);
1880         GuiWorkArea * wa;
1881         if (index == -1)
1882                 wa = currentWorkArea();
1883         else {
1884                 wa = workArea(index);
1885                 LASSERT(wa, return);
1886         }
1887         wa->view().closeWorkArea(wa);
1888 }
1889
1890
1891 ///
1892 class DisplayPath {
1893 public:
1894         /// make vector happy
1895         DisplayPath() : tab_(-1), dottedPrefix_(false) {}
1896         ///
1897         DisplayPath(int tab, FileName const & filename)
1898                 : tab_(tab)
1899         {
1900                 filename_ = (filename.extension() == "lyx") ?
1901                         toqstr(filename.onlyFileNameWithoutExt())
1902                         : toqstr(filename.onlyFileName());
1903                 postfix_ = toqstr(filename.absoluteFilePath()).
1904                         split("/", QString::SkipEmptyParts);
1905                 postfix_.pop_back();
1906                 abs_ = toqstr(filename.absoluteFilePath());
1907                 dottedPrefix_ = false;
1908         }
1909
1910         /// Absolute path for debugging.
1911         QString abs() const
1912         {
1913                 return abs_;
1914         }
1915         /// Add the first segment from the postfix or three dots to the prefix.
1916         /// Merge multiple dot tripples. In fact dots are added lazily, i.e. only
1917         /// when really needed.
1918         void shiftPathSegment(bool dotted)
1919         {
1920                 if (postfix_.count() <= 0)
1921                         return;
1922
1923                 if (!dotted) {
1924                         if (dottedPrefix_ && !prefix_.isEmpty())
1925                                 prefix_ += ellipsisSlash_;
1926                         prefix_ += postfix_.front() + "/";
1927                 }
1928                 dottedPrefix_ = dotted && !prefix_.isEmpty();
1929                 postfix_.pop_front();
1930         }
1931         ///
1932         QString displayString() const
1933         {
1934                 if (prefix_.isEmpty())
1935                         return filename_;
1936
1937                 bool dots = dottedPrefix_ || !postfix_.isEmpty();
1938                 return prefix_ + (dots ? ellipsisSlash_ : "") + filename_;
1939         }
1940         ///
1941         QString forecastPathString() const
1942         {
1943                 if (postfix_.count() == 0)
1944                         return displayString();
1945
1946                 return prefix_
1947                         + (dottedPrefix_ ? ellipsisSlash_ : "")
1948                         + postfix_.front() + "/";
1949         }
1950         ///
1951         bool final() const { return postfix_.empty(); }
1952         ///
1953         int tab() const { return tab_; }
1954
1955 private:
1956         /// ".../"
1957         static QString const ellipsisSlash_;
1958         ///
1959         QString prefix_;
1960         ///
1961         QStringList postfix_;
1962         ///
1963         QString filename_;
1964         ///
1965         QString abs_;
1966         ///
1967         int tab_;
1968         ///
1969         bool dottedPrefix_;
1970 };
1971
1972
1973 QString const DisplayPath::ellipsisSlash_ = QString(QChar(0x2026)) + "/";
1974
1975
1976 ///
1977 bool operator<(DisplayPath const & a, DisplayPath const & b)
1978 {
1979         return a.displayString() < b.displayString();
1980 }
1981
1982 ///
1983 bool operator==(DisplayPath const & a, DisplayPath const & b)
1984 {
1985         return a.displayString() == b.displayString();
1986 }
1987
1988
1989 void TabWorkArea::updateTabTexts()
1990 {
1991         size_t n = count();
1992         if (n == 0)
1993                 return;
1994         std::list<DisplayPath> paths;
1995         typedef std::list<DisplayPath>::iterator It;
1996
1997         // collect full names first: path into postfix, empty prefix and
1998         // filename without extension
1999         for (size_t i = 0; i < n; ++i) {
2000                 GuiWorkArea * i_wa = workArea(i);
2001                 FileName const fn = i_wa->bufferView().buffer().fileName();
2002                 paths.push_back(DisplayPath(i, fn));
2003         }
2004
2005         // go through path segments and see if it helps to make the path more unique
2006         bool somethingChanged = true;
2007         bool allFinal = false;
2008         while (somethingChanged && !allFinal) {
2009                 // adding path segments changes order
2010                 paths.sort();
2011
2012                 LYXERR(Debug::GUI, "updateTabTexts() iteration start");
2013                 somethingChanged = false;
2014                 allFinal = true;
2015
2016                 // find segments which are not unique (i.e. non-atomic)
2017                 It it = paths.begin();
2018                 It segStart = it;
2019                 QString segString = it->displayString();
2020                 for (; it != paths.end(); ++it) {
2021                         // look to the next item
2022                         It next = it;
2023                         ++next;
2024
2025                         // final?
2026                         allFinal = allFinal && it->final();
2027
2028                         LYXERR(Debug::GUI, "it = " << it->abs()
2029                                << " => " << it->displayString());
2030
2031                         // still the same segment?
2032                         QString nextString;
2033                         if ((next != paths.end()
2034                              && (nextString = next->displayString()) == segString))
2035                                 continue;
2036                         LYXERR(Debug::GUI, "segment ended");
2037
2038                         // only a trivial one with one element?
2039                         if (it == segStart) {
2040                                 // start new segment
2041                                 segStart = next;
2042                                 segString = nextString;
2043                                 continue;
2044                         }
2045
2046                         // We found a non-atomic segment
2047                         // We know that segStart <= it < next <= paths.end().
2048                         // The assertion below tells coverity about it.
2049                         LATTEST(segStart != paths.end());
2050                         QString dspString = segStart->forecastPathString();
2051                         LYXERR(Debug::GUI, "first forecast found for "
2052                                << segStart->abs() << " => " << dspString);
2053                         It sit = segStart;
2054                         ++sit;
2055                         // Shift path segments and hope for the best
2056                         // that it makes the path more unique.
2057                         somethingChanged = true;
2058                         bool moreUnique = false;
2059                         for (; sit != next; ++sit) {
2060                                 if (sit->forecastPathString() != dspString) {
2061                                         LYXERR(Debug::GUI, "different forecast found for "
2062                                                 << sit->abs() << " => " << sit->forecastPathString());
2063                                         moreUnique = true;
2064                                         break;
2065                                 }
2066                                 LYXERR(Debug::GUI, "same forecast found for "
2067                                         << sit->abs() << " => " << dspString);
2068                         }
2069
2070                         // if the path segment helped, add it. Otherwise add dots
2071                         bool dots = !moreUnique;
2072                         LYXERR(Debug::GUI, "using dots = " << dots);
2073                         for (sit = segStart; sit != next; ++sit) {
2074                                 sit->shiftPathSegment(dots);
2075                                 LYXERR(Debug::GUI, "shifting "
2076                                         << sit->abs() << " => " << sit->displayString());
2077                         }
2078
2079                         // start new segment
2080                         segStart = next;
2081                         segString = nextString;
2082                 }
2083         }
2084
2085         // set new tab titles
2086         for (It it = paths.begin(); it != paths.end(); ++it) {
2087                 int const tab_index = it->tab();
2088                 Buffer const & buf = workArea(tab_index)->bufferView().buffer();
2089                 QString tab_text = it->displayString().replace("&", "&&");
2090                 if (!buf.fileName().empty() && !buf.isClean())
2091                         tab_text += "*";
2092                 QString tab_tooltip = it->abs();
2093                 if (buf.hasReadonlyFlag()) {
2094                         setTabIcon(tab_index, QIcon(getPixmap("images/", "emblem-readonly", "svgz,png")));
2095                         tab_tooltip = qt_("%1 (read only)").arg(tab_tooltip);
2096                 } else
2097                         setTabIcon(tab_index, QIcon());
2098                 if (buf.notifiesExternalModification()) {
2099                         QString const warn = qt_("%1 (modified externally)");
2100                         tab_tooltip = warn.arg(tab_tooltip);
2101                         tab_text += QChar(0x26a0);
2102                 }
2103                 setTabText(tab_index, tab_text);
2104                 setTabToolTip(tab_index, tab_tooltip);
2105         }
2106 }
2107
2108
2109 void TabWorkArea::showContextMenu(const QPoint & pos)
2110 {
2111         // which tab?
2112         clicked_tab_ = static_cast<DragTabBar *>(tabBar())->tabAt(pos);
2113         if (clicked_tab_ == -1)
2114                 return;
2115
2116         // show tab popup
2117         QMenu popup;
2118         popup.addAction(QIcon(getPixmap("images/", "hidetab", "svgz,png")),
2119                 qt_("Hide tab"), this, SLOT(hideCurrentTab()));
2120         popup.addAction(QIcon(getPixmap("images/", "closetab", "svgz,png")),
2121                 qt_("Close tab"), this, SLOT(closeCurrentBuffer()));
2122         popup.exec(tabBar()->mapToGlobal(pos));
2123
2124         clicked_tab_ = -1;
2125 }
2126
2127
2128 void TabWorkArea::moveTab(int fromIndex, int toIndex)
2129 {
2130         QWidget * w = widget(fromIndex);
2131         QIcon icon = tabIcon(fromIndex);
2132         QString text = tabText(fromIndex);
2133
2134         setCurrentIndex(fromIndex);
2135         removeTab(fromIndex);
2136         insertTab(toIndex, w, icon, text);
2137         setCurrentIndex(toIndex);
2138 }
2139
2140
2141 DragTabBar::DragTabBar(QWidget* parent)
2142         : QTabBar(parent)
2143 {
2144         setAcceptDrops(true);
2145         setTabsClosable(!lyxrc.single_close_tab_button);
2146 }
2147
2148
2149 void DragTabBar::mousePressEvent(QMouseEvent * event)
2150 {
2151         if (event->button() == Qt::LeftButton)
2152                 dragStartPos_ = event->pos();
2153         QTabBar::mousePressEvent(event);
2154 }
2155
2156
2157 void DragTabBar::mouseMoveEvent(QMouseEvent * event)
2158 {
2159         // If the left button isn't pressed anymore then return
2160         if (!(event->buttons() & Qt::LeftButton))
2161                 return;
2162
2163         // If the distance is too small then return
2164         if ((event->pos() - dragStartPos_).manhattanLength()
2165             < QApplication::startDragDistance())
2166                 return;
2167
2168         // did we hit something after all?
2169         int tab = tabAt(dragStartPos_);
2170         if (tab == -1)
2171                 return;
2172
2173         // simulate button release to remove highlight from button
2174         int i = currentIndex();
2175         QMouseEvent me(QEvent::MouseButtonRelease, dragStartPos_,
2176                 event->button(), event->buttons(), 0);
2177         QTabBar::mouseReleaseEvent(&me);
2178         setCurrentIndex(i);
2179
2180         // initiate Drag
2181         QDrag * drag = new QDrag(this);
2182         QMimeData * mimeData = new QMimeData;
2183         // a crude way to distinguish tab-reodering drops from other ones
2184         mimeData->setData("action", "tab-reordering") ;
2185         drag->setMimeData(mimeData);
2186
2187         // get tab pixmap as cursor
2188         QRect r = tabRect(tab);
2189         QPixmap pixmap(r.size());
2190         render(&pixmap, - r.topLeft());
2191         drag->setPixmap(pixmap);
2192         drag->exec();
2193 }
2194
2195
2196 void DragTabBar::dragEnterEvent(QDragEnterEvent * event)
2197 {
2198         // Only accept if it's an tab-reordering request
2199         QMimeData const * m = event->mimeData();
2200         QStringList formats = m->formats();
2201         if (formats.contains("action")
2202             && m->data("action") == "tab-reordering")
2203                 event->acceptProposedAction();
2204 }
2205
2206
2207 void DragTabBar::dropEvent(QDropEvent * event)
2208 {
2209         int fromIndex = tabAt(dragStartPos_);
2210         int toIndex = tabAt(event->pos());
2211
2212         // Tell interested objects that
2213         if (fromIndex != toIndex)
2214                 tabMoveRequested(fromIndex, toIndex);
2215         event->acceptProposedAction();
2216 }
2217
2218
2219 GuiWorkAreaContainer::GuiWorkAreaContainer(GuiWorkArea * wa, QWidget * parent)
2220         : QWidget(parent), wa_(wa)
2221 {
2222         LASSERT(wa, return);
2223         Ui::WorkAreaUi::setupUi(this);
2224         layout()->addWidget(wa);
2225         connect(wa, SIGNAL(titleChanged(GuiWorkArea *)),
2226                 this, SLOT(updateDisplay()));
2227         connect(reloadPB, SIGNAL(clicked()), this, SLOT(reload()));
2228         connect(ignorePB, SIGNAL(clicked()), this, SLOT(ignore()));
2229         setMessageColour({notificationFrame}, {reloadPB, ignorePB});
2230         updateDisplay();
2231 }
2232
2233
2234 void GuiWorkAreaContainer::updateDisplay()
2235 {
2236         Buffer const & buf = wa_->bufferView().buffer();
2237         notificationFrame->setHidden(!buf.notifiesExternalModification());
2238         QString const label = qt_("<b>The file %1 changed on disk.</b>")
2239                 .arg(toqstr(buf.fileName().displayName()));
2240         externalModificationLabel->setText(label);
2241 }
2242
2243
2244 void GuiWorkAreaContainer::dispatch(FuncRequest f) const
2245 {
2246         lyx::dispatch(FuncRequest(LFUN_BUFFER_SWITCH,
2247                                   wa_->bufferView().buffer().absFileName()));
2248         lyx::dispatch(f);
2249 }
2250
2251
2252 void GuiWorkAreaContainer::reload() const
2253 {
2254         dispatch(FuncRequest(LFUN_BUFFER_RELOAD));
2255 }
2256
2257
2258 void GuiWorkAreaContainer::ignore() const
2259 {
2260         dispatch(FuncRequest(LFUN_BUFFER_EXTERNAL_MODIFICATION_CLEAR));
2261 }
2262
2263
2264 void GuiWorkAreaContainer::mouseDoubleClickEvent(QMouseEvent * event)
2265 {
2266         // prevent TabWorkArea from opening a new buffer on double click
2267         event->accept();
2268 }
2269
2270
2271 } // namespace frontend
2272 } // namespace lyx
2273
2274 #include "moc_GuiWorkArea.cpp"