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/FileName.h"
  51 #include "support/lassert.h"
  52 #include "support/TempFile.h"
  53
  54 #include "frontends/Application.h"
  55 #include "frontends/FontMetrics.h"
  56 #include "frontends/WorkAreaManager.h"
  57
  58 #include <QContextMenuEvent>
  59 #if (QT_VERSION < 0x050000)
  60 #include <QInputContext>
  61 #endif
  62 #include <QDrag>
  63 #include <QHelpEvent>
  64 #ifdef Q_OS_MAC
  65 #include <QProxyStyle>
  66 #endif
  67 #include <QMainWindow>
  68 #include <QMimeData>
  69 #include <QMenu>
  70 #include <QPainter>
  71 #include <QPalette>
  72 #include <QPixmapCache>
  73 #include <QScrollBar>
  74 #include <QStyleOption>
  75 #include <QStylePainter>
  76 #include <QTimer>
  77 #include <QToolButton>
  78 #include <QToolTip>
  79 #include <QMenuBar>
  80
  81 #include "support/bind.h"
  82
  83 #include <cmath>
  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.zoom + 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), read_only_(false), 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 {
 255 }
 256
 257
 258 GuiWorkArea::GuiWorkArea(QWidget * /* w */)
 259 : d(new Private(this))
 260 {
 261 }
 262
 263
 264 GuiWorkArea::GuiWorkArea(Buffer & buffer, GuiView & gv)
 265 : d(new Private(this))
 266 {
 267         setGuiView(gv);
 268         buffer.params().display_pixel_ratio = theGuiApp()->pixelRatio();
 269         setBuffer(buffer);
 270         init();
 271 }
 272
 273
 274 double GuiWorkArea::pixelRatio() const
 275 {
 276 #if QT_VERSION >= 0x050000
 277         return devicePixelRatio();
 278 #else
 279         return 1.0;
 280 #endif
 281 }
 282
 283
 284 void GuiWorkArea::init()
 285 {
 286         // Setup the signals
 287         connect(&d->cursor_timeout_, SIGNAL(timeout()),
 288                 this, SLOT(toggleCursor()));
 289
 290         int const time = QApplication::cursorFlashTime() / 2;
 291         if (time > 0) {
 292                 d->cursor_timeout_.setInterval(time);
 293                 d->cursor_timeout_.start();
 294         } else {
 295                 // let's initialize this just to be safe
 296                 d->cursor_timeout_.setInterval(500);
 297         }
 298
 299         d->resetScreen();
 300         // With Qt4.5 a mouse event will happen before the first paint event
 301         // so make sure that the buffer view has an up to date metrics.
 302         d->buffer_view_->resize(viewport()->width(), viewport()->height());
 303         d->cursor_ = new frontend::CursorWidget();
 304         d->cursor_->hide();
 305
 306         setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 307         setAcceptDrops(true);
 308         setMouseTracking(true);
 309         setMinimumSize(100, 70);
 310         setFrameStyle(QFrame::NoFrame);
 311         updateWindowTitle();
 312
 313         viewport()->setAutoFillBackground(false);
 314         // We don't need double-buffering nor SystemBackground on
 315         // the viewport because we have our own backing pixmap.
 316         viewport()->setAttribute(Qt::WA_NoSystemBackground);
 317
 318         setFocusPolicy(Qt::StrongFocus);
 319
 320         d->setCursorShape(Qt::IBeamCursor);
 321
 322         d->synthetic_mouse_event_.timeout.timeout.connect(
 323                 bind(&GuiWorkArea::generateSyntheticMouseEvent,
 324                                         this));
 325
 326         // Initialize the vertical Scroll Bar
 327         QObject::connect(verticalScrollBar(), SIGNAL(valueChanged(int)),
 328                 this, SLOT(scrollTo(int)));
 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         d->buffer_view_->buffer().workAreaManager().remove(this);
 344         delete d->screen_;
 345         delete d->buffer_view_;
 346         delete d->cursor_;
 347         // Completer has a QObject parent and is thus automatically destroyed.
 348         // See #4758.
 349         // delete completer_;
 350         delete d;
 351 }
 352
 353
 354 Qt::CursorShape GuiWorkArea::cursorShape() const
 355 {
 356         return viewport()->cursor().shape();
 357 }
 358
 359
 360 void GuiWorkArea::Private::setCursorShape(Qt::CursorShape shape)
 361 {
 362         p->viewport()->setCursor(shape);
 363 }
 364
 365
 366 void GuiWorkArea::Private::updateCursorShape()
 367 {
 368         setCursorShape(buffer_view_->clickableInset()
 369                 ? Qt::PointingHandCursor : Qt::IBeamCursor);
 370 }
 371
 372
 373 void GuiWorkArea::setGuiView(GuiView & gv)
 374 {
 375         d->lyx_view_ = &gv;
 376 }
 377
 378
 379 void GuiWorkArea::setBuffer(Buffer & buffer)
 380 {
 381         delete d->buffer_view_;
 382         d->buffer_view_ = new BufferView(buffer);
 383         buffer.workAreaManager().add(this);
 384
 385         // HACK: Prevents an additional redraw when the scrollbar pops up
 386         // which regularily happens on documents with more than one page.
 387         // The policy  should be set to "Qt::ScrollBarAsNeeded" soon.
 388         // Since we have no geometry information yet, we assume that
 389         // a document needs a scrollbar if there is more then four
 390         // paragraph in the outermost text.
 391         if (buffer.text().paragraphs().size() > 4)
 392                 setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
 393         QTimer::singleShot(50, this, SLOT(fixVerticalScrollBar()));
 394 }
 395
 396
 397 void GuiWorkArea::fixVerticalScrollBar()
 398 {
 399         if (!isFullScreen())
 400                 setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
 401 }
 402
 403
 404 void GuiWorkArea::close()
 405 {
 406         d->lyx_view_->removeWorkArea(this);
 407 }
 408
 409
 410 void GuiWorkArea::setFullScreen(bool full_screen)
 411 {
 412         d->buffer_view_->setFullScreen(full_screen);
 413         setFrameStyle(QFrame::NoFrame);
 414         if (full_screen) {
 415                 setFrameStyle(QFrame::NoFrame);
 416                 if (lyxrc.full_screen_scrollbar)
 417                         setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 418         } else
 419                 setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
 420 }
 421
 422
 423 BufferView & GuiWorkArea::bufferView()
 424 {
 425         return *d->buffer_view_;
 426 }
 427
 428
 429 BufferView const & GuiWorkArea::bufferView() const
 430 {
 431         return *d->buffer_view_;
 432 }
 433
 434
 435 void GuiWorkArea::stopBlinkingCursor()
 436 {
 437         d->cursor_timeout_.stop();
 438         d->hideCursor();
 439 }
 440
 441
 442 void GuiWorkArea::startBlinkingCursor()
 443 {
 444         // do not show the cursor if the view is busy
 445         if (view().busy())
 446                 return;
 447
 448         Point p;
 449         int h = 0;
 450         d->buffer_view_->cursorPosAndHeight(p, h);
 451         // Don't start blinking if the cursor isn't on screen.
 452         if (!d->buffer_view_->cursorInView(p, h))
 453                 return;
 454
 455         d->showCursor();
 456
 457         //we're not supposed to cache this value.
 458         int const time = QApplication::cursorFlashTime() / 2;
 459         if (time <= 0)
 460                 return;
 461         d->cursor_timeout_.setInterval(time);
 462         d->cursor_timeout_.start();
 463 }
 464
 465
 466 void GuiWorkArea::redraw(bool update_metrics)
 467 {
 468         if (!isVisible())
 469                 // No need to redraw in this case.
 470                 return;
 471
 472         // No need to do anything if this is the current view. The BufferView
 473         // metrics are already up to date.
 474         if (update_metrics || d->lyx_view_ != guiApp->currentView()
 475                 || d->lyx_view_->currentWorkArea() != this) {
 476                 // FIXME: it would be nice to optimize for the off-screen case.
 477                 d->buffer_view_->cursor().fixIfBroken();
 478                 d->buffer_view_->updateMetrics();
 479                 d->buffer_view_->cursor().fixIfBroken();
 480         }
 481
 482         // update cursor position, because otherwise it has to wait until
 483         // the blinking interval is over
 484         if (d->cursor_visible_) {
 485                 d->hideCursor();
 486                 d->showCursor();
 487         }
 488
 489         LYXERR(Debug::WORKAREA, "WorkArea::redraw screen");
 490         d->updateScreen();
 491         update(0, 0, viewport()->width(), viewport()->height());
 492
 493         /// \warning: scrollbar updating *must* be done after the BufferView is drawn
 494         /// because \c BufferView::updateScrollbar() is called in \c BufferView::draw().
 495         d->updateScrollbar();
 496         d->lyx_view_->updateStatusBar();
 497
 498         if (lyxerr.debugging(Debug::WORKAREA))
 499                 d->buffer_view_->coordCache().dump();
 500
 501         updateWindowTitle();
 502
 503         d->updateCursorShape();
 504 }
 505
 506
 507 void GuiWorkArea::processKeySym(KeySymbol const & key, KeyModifier mod)
 508 {
 509         if (d->lyx_view_->isFullScreen() && d->lyx_view_->menuBar()->isVisible()
 510                 && lyxrc.full_screen_menubar) {
 511                 // FIXME HACK: we should not have to do this here. See related comment
 512                 // in GuiView::event() (QEvent::ShortcutOverride)
 513                 d->lyx_view_->menuBar()->hide();
 514         }
 515
 516         // In order to avoid bad surprise in the middle of an operation,
 517         // we better stop the blinking cursor...
 518         // the cursor gets restarted in GuiView::restartCursor()
 519         stopBlinkingCursor();
 520         guiApp->processKeySym(key, mod);
 521 }
 522
 523
 524 void GuiWorkArea::Private::dispatch(FuncRequest const & cmd0, KeyModifier mod)
 525 {
 526         // Handle drag&drop
 527         if (cmd0.action() == LFUN_FILE_OPEN) {
 528                 DispatchResult dr;
 529                 lyx_view_->dispatch(cmd0, dr);
 530                 return;
 531         }
 532
 533         FuncRequest cmd;
 534
 535         if (cmd0.action() == LFUN_MOUSE_PRESS) {
 536                 if (mod == ShiftModifier)
 537                         cmd = FuncRequest(cmd0, "region-select");
 538                 else if (mod == ControlModifier)
 539                         cmd = FuncRequest(cmd0, "paragraph-select");
 540                 else
 541                         cmd = cmd0;
 542         }
 543         else
 544                 cmd = cmd0;
 545
 546         bool const notJustMovingTheMouse =
 547                 cmd.action() != LFUN_MOUSE_MOTION || cmd.button() != mouse_button::none;
 548
 549         // In order to avoid bad surprise in the middle of an operation, we better stop
 550         // the blinking cursor.
 551         if (notJustMovingTheMouse)
 552                 p->stopBlinkingCursor();
 553
 554         buffer_view_->mouseEventDispatch(cmd);
 555
 556         // Skip these when selecting
 557         // FIXME: let GuiView take care of those.
 558         if (cmd.action() != LFUN_MOUSE_MOTION) {
 559                 completer_->updateVisibility(false, false);
 560                 lyx_view_->updateDialogs();
 561                 lyx_view_->updateStatusBar();
 562         }
 563
 564         // GUI tweaks except with mouse motion with no button pressed.
 565         if (notJustMovingTheMouse) {
 566                 // Slight hack: this is only called currently when we
 567                 // clicked somewhere, so we force through the display
 568                 // of the new status here.
 569                 // FIXME: let GuiView take care of those.
 570                 lyx_view_->clearMessage();
 571
 572                 // Show the cursor immediately after any operation
 573                 p->startBlinkingCursor();
 574         }
 575
 576         updateCursorShape();
 577 }
 578
 579
 580 void GuiWorkArea::Private::resizeBufferView()
 581 {
 582         // WARNING: Please don't put any code that will trigger a repaint here!
 583         // We are already inside a paint event.
 584         p->stopBlinkingCursor();
 585         // Warn our container (GuiView).
 586         p->busy(true);
 587
 588         Point point;
 589         int h = 0;
 590         buffer_view_->cursorPosAndHeight(point, h);
 591         bool const cursor_in_view = buffer_view_->cursorInView(point, h);
 592         buffer_view_->resize(p->viewport()->width(), p->viewport()->height());
 593         if (cursor_in_view)
 594                 buffer_view_->scrollToCursor();
 595         updateScreen();
 596
 597         // Update scrollbars which might have changed due different
 598         // BufferView dimension. This is especially important when the
 599         // BufferView goes from zero-size to the real-size for the first time,
 600         // as the scrollbar paramters are then set for the first time.
 601         updateScrollbar();
 602
 603         need_resize_ = false;
 604         p->busy(false);
 605         // Eventually, restart the cursor after the resize event.
 606         // We might be resizing even if the focus is on another widget so we only
 607         // restart the cursor if we have the focus.
 608         if (p->hasFocus())
 609                 QTimer::singleShot(50, p, SLOT(startBlinkingCursor()));
 610 }
 611
 612
 613 void GuiWorkArea::Private::showCursor()
 614 {
 615         if (cursor_visible_)
 616                 return;
 617
 618         Point p;
 619         int h = 0;
 620         buffer_view_->cursorPosAndHeight(p, h);
 621         if (!buffer_view_->cursorInView(p, h))
 622                 return;
 623
 624         // RTL or not RTL
 625         bool l_shape = false;
 626         Font const & realfont = buffer_view_->cursor().real_current_font;
 627         BufferParams const & bp = buffer_view_->buffer().params();
 628         bool const samelang = realfont.language() == bp.language;
 629         bool const isrtl = realfont.isVisibleRightToLeft();
 630
 631         if (!samelang || isrtl != bp.language->rightToLeft())
 632                 l_shape = true;
 633
 634         // The ERT language hack needs fixing up
 635         if (realfont.language() == latex_language)
 636                 l_shape = false;
 637
 638         // show cursor on screen
 639         Cursor & cur = buffer_view_->cursor();
 640         bool completable = cur.inset().showCompletionCursor()
 641                 && completer_->completionAvailable()
 642                 && !completer_->popupVisible()
 643                 && !completer_->inlineVisible();
 644         cursor_visible_ = true;
 645         cursor_->recomputeWidth();
 646
 647         //int cur_x = buffer_view_->getPos(cur).x_;
 648         // We may have decided to slide the cursor row so that cursor
 649         // is visible.
 650         p.x_ -= buffer_view_->horizScrollOffset();
 651
 652         showCursor(p.x_, p.y_, h, l_shape, isrtl, completable);
 653 }
 654
 655
 656 void GuiWorkArea::Private::hideCursor()
 657 {
 658         if (!cursor_visible_)
 659                 return;
 660
 661         cursor_visible_ = false;
 662         removeCursor();
 663 }
 664
 665
 666 void GuiWorkArea::toggleCursor()
 667 {
 668         if (d->cursor_visible_)
 669                 d->hideCursor();
 670         else
 671                 d->showCursor();
 672 }
 673
 674
 675 void GuiWorkArea::Private::updateScrollbar()
 676 {
 677         ScrollbarParameters const & scroll_ = buffer_view_->scrollbarParameters();
 678         // WARNING: don't touch at the scrollbar value like this:
 679         //   verticalScrollBar()->setValue(scroll_.position);
 680         // because this would cause a recursive signal/slot calling with
 681         // GuiWorkArea::scrollTo
 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(scroll_.position);
 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(), s);
 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                 // We catch this event in order to catch the Tab or Shift+Tab key press
 729                 // which are otherwise reserved to focus switching between controls
 730                 // within a dialog.
 731                 QKeyEvent * ke = static_cast<QKeyEvent*>(e);
 732                 if ((ke->key() == Qt::Key_Tab && ke->modifiers() == Qt::NoModifier)
 733                         || (ke->key() == Qt::Key_Backtab && (
 734                                 ke->modifiers() == Qt::ShiftModifier
 735                                 || ke->modifiers() == Qt::NoModifier))) {
 736                         keyPressEvent(ke);
 737                         return true;
 738                 }
 739                 return QAbstractScrollArea::event(e);
 740         }
 741
 742         default:
 743                 return QAbstractScrollArea::event(e);
 744         }
 745         return false;
 746 }
 747
 748
 749 void GuiWorkArea::contextMenuEvent(QContextMenuEvent * e)
 750 {
 751         string name;
 752         if (e->reason() == QContextMenuEvent::Mouse)
 753                 // the menu name is set on mouse press
 754                 name = d->context_menu_name_;
 755         else {
 756                 QPoint pos = e->pos();
 757                 Cursor const & cur = d->buffer_view_->cursor();
 758                 if (e->reason() == QContextMenuEvent::Keyboard && cur.inTexted()) {
 759                         // Do not access the context menu of math right in front of before
 760                         // the cursor. This does not work when the cursor is in text.
 761                         Inset * inset = cur.paragraph().getInset(cur.pos());
 762                         if (inset && inset->asInsetMath())
 763                                 --pos.rx();
 764                         else if (cur.pos() > 0) {
 765                                 Inset * inset = cur.paragraph().getInset(cur.pos() - 1);
 766                                 if (inset)
 767                                         ++pos.rx();
 768                         }
 769                 }
 770                 name = d->buffer_view_->contextMenu(pos.x(), pos.y());
 771         }
 772
 773         if (name.empty()) {
 774                 QAbstractScrollArea::contextMenuEvent(e);
 775                 return;
 776         }
 777         // always show mnemonics when the keyboard is used to show the context menu
 778         // FIXME: This should be fixed in Qt itself
 779         bool const keyboard = (e->reason() == QContextMenuEvent::Keyboard);
 780         QMenu * menu = guiApp->menus().menu(toqstr(name), *d->lyx_view_, keyboard);
 781         if (!menu) {
 782                 QAbstractScrollArea::contextMenuEvent(e);
 783                 return;
 784         }
 785         // Position the menu to the right.
 786         // FIXME: menu position should be different for RTL text.
 787         menu->exec(e->globalPos());
 788         e->accept();
 789 }
 790
 791
 792 void GuiWorkArea::focusInEvent(QFocusEvent * e)
 793 {
 794         LYXERR(Debug::DEBUG, "GuiWorkArea::focusInEvent(): " << this << endl);
 795         if (d->lyx_view_->currentWorkArea() != this) {
 796                 d->lyx_view_->setCurrentWorkArea(this);
 797                 d->lyx_view_->currentWorkArea()->bufferView().buffer().updateBuffer();
 798         }
 799
 800         startBlinkingCursor();
 801         QAbstractScrollArea::focusInEvent(e);
 802 }
 803
 804
 805 void GuiWorkArea::focusOutEvent(QFocusEvent * e)
 806 {
 807         LYXERR(Debug::DEBUG, "GuiWorkArea::focusOutEvent(): " << this << endl);
 808         stopBlinkingCursor();
 809         QAbstractScrollArea::focusOutEvent(e);
 810 }
 811
 812
 813 void GuiWorkArea::mousePressEvent(QMouseEvent * e)
 814 {
 815         if (d->dc_event_.active && d->dc_event_ == *e) {
 816                 d->dc_event_.active = false;
 817                 FuncRequest cmd(LFUN_MOUSE_TRIPLE, e->x(), e->y(),
 818                         q_button_state(e->button()));
 819                 d->dispatch(cmd);
 820                 e->accept();
 821                 return;
 822         }
 823
 824 #if (QT_VERSION < 0x050000) && !defined(__HAIKU__)
 825         inputContext()->reset();
 826 #endif
 827
 828         FuncRequest const cmd(LFUN_MOUSE_PRESS, e->x(), e->y(),
 829                 q_button_state(e->button()));
 830         d->dispatch(cmd, q_key_state(e->modifiers()));
 831
 832         // Save the context menu on mouse press, because also the mouse
 833         // cursor is set on mouse press. Afterwards, we can either release
 834         // the mousebutton somewhere else, or the cursor might have moved
 835         // due to the DEPM. We need to do this after the mouse has been
 836         // set in dispatch(), because the selection state might change.
 837         if (e->button() == Qt::RightButton)
 838                 d->context_menu_name_ = d->buffer_view_->contextMenu(e->x(), e->y());
 839
 840         e->accept();
 841 }
 842
 843
 844 void GuiWorkArea::mouseReleaseEvent(QMouseEvent * e)
 845 {
 846         if (d->synthetic_mouse_event_.timeout.running())
 847                 d->synthetic_mouse_event_.timeout.stop();
 848
 849         FuncRequest const cmd(LFUN_MOUSE_RELEASE, e->x(), e->y(),
 850                               q_button_state(e->button()));
 851         d->dispatch(cmd);
 852         e->accept();
 853 }
 854
 855
 856 void GuiWorkArea::mouseMoveEvent(QMouseEvent * e)
 857 {
 858         // we kill the triple click if we move
 859         doubleClickTimeout();
 860         FuncRequest cmd(LFUN_MOUSE_MOTION, e->x(), e->y(),
 861                 q_motion_state(e->buttons()));
 862
 863         e->accept();
 864
 865         // If we're above or below the work area...
 866         if ((e->y() <= 20 || e->y() >= viewport()->height() - 20)
 867                         && e->buttons() == mouse_button::button1) {
 868                 // Make sure only a synthetic event can cause a page scroll,
 869                 // so they come at a steady rate:
 870                 if (e->y() <= 20)
 871                         // _Force_ a scroll up:
 872                         cmd.set_y(e->y() - 21);
 873                 else
 874                         cmd.set_y(e->y() + 21);
 875                 // Store the event, to be handled when the timeout expires.
 876                 d->synthetic_mouse_event_.cmd = cmd;
 877
 878                 if (d->synthetic_mouse_event_.timeout.running()) {
 879                         // Discard the event. Note that it _may_ be handled
 880                         // when the timeout expires if
 881                         // synthetic_mouse_event_.cmd has not been overwritten.
 882                         // Ie, when the timeout expires, we handle the
 883                         // most recent event but discard all others that
 884                         // occurred after the one used to start the timeout
 885                         // in the first place.
 886                         return;
 887                 }
 888
 889                 d->synthetic_mouse_event_.restart_timeout = true;
 890                 d->synthetic_mouse_event_.timeout.start();
 891                 // Fall through to handle this event...
 892
 893         } else if (d->synthetic_mouse_event_.timeout.running()) {
 894                 // Store the event, to be possibly handled when the timeout
 895                 // expires.
 896                 // Once the timeout has expired, normal control is returned
 897                 // to mouseMoveEvent (restart_timeout = false).
 898                 // This results in a much smoother 'feel' when moving the
 899                 // mouse back into the work area.
 900                 d->synthetic_mouse_event_.cmd = cmd;
 901                 d->synthetic_mouse_event_.restart_timeout = false;
 902                 return;
 903         }
 904         d->dispatch(cmd);
 905 }
 906
 907
 908 void GuiWorkArea::wheelEvent(QWheelEvent * ev)
 909 {
 910         // Wheel rotation by one notch results in a delta() of 120 (see
 911         // documentation of QWheelEvent)
 912         double const delta = ev->delta() / 120.0;
 913         bool zoom = false;
 914         switch (lyxrc.scroll_wheel_zoom) {
 915         case LyXRC::SCROLL_WHEEL_ZOOM_CTRL:
 916                 zoom = ev->modifiers() & Qt::ControlModifier;
 917                 zoom &= !(ev->modifiers() & (Qt::ShiftModifier | Qt::AltModifier));
 918                 break;
 919         case LyXRC::SCROLL_WHEEL_ZOOM_SHIFT:
 920                 zoom = ev->modifiers() & Qt::ShiftModifier;
 921                 zoom &= !(ev->modifiers() & (Qt::ControlModifier | Qt::AltModifier));
 922                 break;
 923         case LyXRC::SCROLL_WHEEL_ZOOM_ALT:
 924                 zoom = ev->modifiers() & Qt::AltModifier;
 925                 zoom &= !(ev->modifiers() & (Qt::ShiftModifier | Qt::ControlModifier));
 926                 break;
 927         case LyXRC::SCROLL_WHEEL_ZOOM_OFF:
 928                 break;
 929         }
 930         if (zoom) {
 931                 docstring arg = convert<docstring>(int(5 * delta));
 932                 lyx::dispatch(FuncRequest(LFUN_BUFFER_ZOOM_IN, arg));
 933                 return;
 934         }
 935
 936         // Take into account the desktop wide settings.
 937         int const lines = qApp->wheelScrollLines();
 938         int const page_step = verticalScrollBar()->pageStep();
 939         // Test if the wheel mouse is set to one screen at a time.
 940         int scroll_value = lines > page_step
 941                 ? page_step : lines * verticalScrollBar()->singleStep();
 942
 943         // Take into account the rotation and the user preferences.
 944         scroll_value = int(scroll_value * delta * lyxrc.mouse_wheel_speed);
 945         LYXERR(Debug::SCROLLING, "wheelScrollLines = " << lines
 946                         << " delta = " << delta << " scroll_value = " << scroll_value
 947                         << " page_step = " << page_step);
 948         // Now scroll.
 949         verticalScrollBar()->setValue(verticalScrollBar()->value() - scroll_value);
 950
 951         ev->accept();
 952 }
 953
 954
 955 void GuiWorkArea::generateSyntheticMouseEvent()
 956 {
 957         int const e_y = d->synthetic_mouse_event_.cmd.y();
 958         int const wh = d->buffer_view_->workHeight();
 959         bool const up = e_y < 0;
 960         bool const down = e_y > wh;
 961
 962         // Set things off to generate the _next_ 'pseudo' event.
 963         int step = 50;
 964         if (d->synthetic_mouse_event_.restart_timeout) {
 965                 // This is some magic formulae to determine the speed
 966                 // of scrolling related to the position of the mouse.
 967                 int time = 200;
 968                 if (up || down) {
 969                         int dist = up ? -e_y : e_y - wh;
 970                         time = max(min(200, 250000 / (dist * dist)), 1) ;
 971
 972                         if (time < 40) {
 973                                 step = 80000 / (time * time);
 974                                 time = 40;
 975                         }
 976                 }
 977                 d->synthetic_mouse_event_.timeout.setTimeout(time);
 978                 d->synthetic_mouse_event_.timeout.start();
 979         }
 980
 981         // Can we scroll further ?
 982         int const value = verticalScrollBar()->value();
 983         if (value == verticalScrollBar()->maximum()
 984                   || value == verticalScrollBar()->minimum()) {
 985                 d->synthetic_mouse_event_.timeout.stop();
 986                 return;
 987         }
 988
 989         // Scroll
 990         if (step <= 2 * wh) {
 991                 d->buffer_view_->scroll(up ? -step : step);
 992                 d->buffer_view_->updateMetrics();
 993         } else {
 994                 d->buffer_view_->scrollDocView(value + (up ? -step : step), false);
 995         }
 996
 997         // In which paragraph do we have to set the cursor ?
 998         Cursor & cur = d->buffer_view_->cursor();
 999         // FIXME: we don't know howto handle math.
1000         Text * text = cur.text();
1001         if (!text)
1002                 return;
1003         TextMetrics const & tm = d->buffer_view_->textMetrics(text);
1004
1005         pair<pit_type, const ParagraphMetrics *> pp = up ? tm.first() : tm.last();
1006         ParagraphMetrics const & pm = *pp.second;
1007         pit_type const pit = pp.first;
1008
1009         if (pm.rows().empty())
1010                 return;
1011
1012         // Find the row at which we set the cursor.
1013         RowList::const_iterator rit = pm.rows().begin();
1014         RowList::const_iterator rlast = pm.rows().end();
1015         int yy = pm.position() - pm.ascent();
1016         for (--rlast; rit != rlast; ++rit) {
1017                 int h = rit->height();
1018                 if ((up && yy + h > 0)
1019                           || (!up && yy + h > wh - defaultRowHeight()))
1020                         break;
1021                 yy += h;
1022         }
1023
1024         // Find the position of the cursor
1025         bool bound;
1026         int x = d->synthetic_mouse_event_.cmd.x();
1027         pos_type const pos = tm.getPosNearX(*rit, x, bound);
1028
1029         // Set the cursor
1030         cur.pit() = pit;
1031         cur.pos() = pos;
1032         cur.boundary(bound);
1033
1034         d->buffer_view_->buffer().changed(false);
1035         return;
1036 }
1037
1038
1039 void GuiWorkArea::keyPressEvent(QKeyEvent * ev)
1040 {
1041         // Do not process here some keys if dialog_mode_ is set
1042         if (d->dialog_mode_
1043                 && (ev->modifiers() == Qt::NoModifier
1044                     || ev->modifiers() == Qt::ShiftModifier)
1045                 && (ev->key() == Qt::Key_Escape
1046                     || ev->key() == Qt::Key_Enter
1047                     || ev->key() == Qt::Key_Return)
1048             ) {
1049                 ev->ignore();
1050                 return;
1051         }
1052
1053         // intercept some keys if completion popup is visible
1054         if (d->completer_->popupVisible()) {
1055                 switch (ev->key()) {
1056                 case Qt::Key_Enter:
1057                 case Qt::Key_Return:
1058                         d->completer_->activate();
1059                         ev->accept();
1060                         return;
1061                 }
1062         }
1063
1064         // do nothing if there are other events
1065         // (the auto repeated events come too fast)
1066         // it looks like this is only needed on X11
1067 #if defined(Q_WS_X11) || defined(QPA_XCB)
1068         if (qApp->hasPendingEvents() && ev->isAutoRepeat()) {
1069                 switch (ev->key()) {
1070                 case Qt::Key_PageDown:
1071                 case Qt::Key_PageUp:
1072                 case Qt::Key_Left:
1073                 case Qt::Key_Right:
1074                 case Qt::Key_Up:
1075                 case Qt::Key_Down:
1076                         LYXERR(Debug::KEY, "system is busy: scroll key event ignored");
1077                         ev->ignore();
1078                         return;
1079                 }
1080         }
1081 #endif
1082
1083         KeyModifier m = q_key_state(ev->modifiers());
1084
1085         std::string str;
1086         if (m & ShiftModifier)
1087                 str += "Shift-";
1088         if (m & ControlModifier)
1089                 str += "Control-";
1090         if (m & AltModifier)
1091                 str += "Alt-";
1092         if (m & MetaModifier)
1093                 str += "Meta-";
1094
1095         LYXERR(Debug::KEY, " count: " << ev->count() << " text: " << ev->text()
1096                 << " isAutoRepeat: " << ev->isAutoRepeat() << " key: " << ev->key()
1097                 << " keyState: " << str);
1098
1099         KeySymbol sym;
1100         setKeySymbol(&sym, ev);
1101         if (sym.isOK()) {
1102                 processKeySym(sym, q_key_state(ev->modifiers()));
1103                 ev->accept();
1104         } else {
1105                 ev->ignore();
1106         }
1107 }
1108
1109
1110 void GuiWorkArea::doubleClickTimeout()
1111 {
1112         d->dc_event_.active = false;
1113 }
1114
1115
1116 void GuiWorkArea::mouseDoubleClickEvent(QMouseEvent * ev)
1117 {
1118         d->dc_event_ = DoubleClick(ev);
1119         QTimer::singleShot(QApplication::doubleClickInterval(), this,
1120                            SLOT(doubleClickTimeout()));
1121         FuncRequest cmd(LFUN_MOUSE_DOUBLE,
1122                         ev->x(), ev->y(),
1123                         q_button_state(ev->button()));
1124         d->dispatch(cmd);
1125         ev->accept();
1126 }
1127
1128
1129 void GuiWorkArea::resizeEvent(QResizeEvent * ev)
1130 {
1131         QAbstractScrollArea::resizeEvent(ev);
1132         d->need_resize_ = true;
1133         ev->accept();
1134 }
1135
1136
1137 void GuiWorkArea::Private::update(int x, int y, int w, int h)
1138 {
1139         p->viewport()->update(x, y, w, h);
1140 }
1141
1142
1143 void GuiWorkArea::paintEvent(QPaintEvent * ev)
1144 {
1145         QRectF const rc = ev->rect();
1146         // LYXERR(Debug::PAINTING, "paintEvent begin: x: " << rc.x()
1147         //      << " y: " << rc.y() << " w: " << rc.width() << " h: " << rc.height());
1148
1149         if (d->needResize()) {
1150                 d->resetScreen();
1151                 d->resizeBufferView();
1152                 if (d->cursor_visible_) {
1153                         d->hideCursor();
1154                         d->showCursor();
1155                 }
1156         }
1157
1158         QPainter pain(viewport());
1159         double const pr = pixelRatio();
1160         QRectF const rcs = QRectF(rc.x() * pr, rc.y() * pr, rc.width() * pr, rc.height() * pr);
1161
1162         if (lyxrc.use_qimage) {
1163                 QImage const & image = static_cast<QImage const &>(*d->screen_);
1164                 pain.drawImage(rc, image, rcs);
1165         } else {
1166                 QPixmap const & pixmap = static_cast<QPixmap const &>(*d->screen_);
1167                 pain.drawPixmap(rc, pixmap, rcs);
1168         }
1169         d->cursor_->draw(pain);
1170         ev->accept();
1171 }
1172
1173
1174 void GuiWorkArea::Private::updateScreen()
1175 {
1176         GuiPainter pain(screen_, p->pixelRatio());
1177         buffer_view_->draw(pain);
1178 }
1179
1180
1181 void GuiWorkArea::Private::showCursor(int x, int y, int h,
1182         bool l_shape, bool rtl, bool completable)
1183 {
1184         if (schedule_redraw_) {
1185                 // This happens when a graphic conversion is finished. As we don't know
1186                 // the size of the new graphics, it's better the update everything.
1187                 // We can't use redraw() here because this would trigger a infinite
1188                 // recursive loop with showCursor().
1189                 buffer_view_->resize(p->viewport()->width(), p->viewport()->height());
1190                 updateScreen();
1191                 updateScrollbar();
1192                 p->viewport()->update(QRect(0, 0, p->viewport()->width(), p->viewport()->height()));
1193                 schedule_redraw_ = false;
1194                 // Show the cursor immediately after the update.
1195                 hideCursor();
1196                 p->toggleCursor();
1197                 return;
1198         }
1199
1200         cursor_->update(x, y, h, l_shape, rtl, completable);
1201         cursor_->show();
1202         p->viewport()->update(cursor_->rect());
1203 }
1204
1205
1206 void GuiWorkArea::Private::removeCursor()
1207 {
1208         cursor_->hide();
1209         //if (!qApp->focusWidget())
1210                 p->viewport()->update(cursor_->rect());
1211 }
1212
1213
1214 void GuiWorkArea::inputMethodEvent(QInputMethodEvent * e)
1215 {
1216         QString const & commit_string = e->commitString();
1217         docstring const & preedit_string
1218                 = qstring_to_ucs4(e->preeditString());
1219
1220         if (!commit_string.isEmpty()) {
1221
1222                 LYXERR(Debug::KEY, "preeditString: " << e->preeditString()
1223                         << " commitString: " << e->commitString());
1224
1225                 int key = 0;
1226
1227                 // FIXME Iwami 04/01/07: we should take care also of UTF16 surrogates here.
1228                 for (int i = 0; i != commit_string.size(); ++i) {
1229                         QKeyEvent ev(QEvent::KeyPress, key, Qt::NoModifier, commit_string[i]);
1230                         keyPressEvent(&ev);
1231                 }
1232         }
1233
1234         // Hide the cursor during the kana-kanji transformation.
1235         if (preedit_string.empty())
1236                 startBlinkingCursor();
1237         else
1238                 stopBlinkingCursor();
1239
1240         // last_width : for checking if last preedit string was/wasn't empty.
1241         // FIXME THREAD
1242         // We could have more than one work area, right?
1243         static bool last_width = false;
1244         if (!last_width && preedit_string.empty()) {
1245                 // if last_width is last length of preedit string.
1246                 e->accept();
1247                 return;
1248         }
1249
1250         GuiPainter pain(d->screen_, pixelRatio());
1251         d->buffer_view_->updateMetrics();
1252         d->buffer_view_->draw(pain);
1253         FontInfo font = d->buffer_view_->cursor().getFont().fontInfo();
1254         FontMetrics const & fm = theFontMetrics(font);
1255         int height = fm.maxHeight();
1256         int cur_x = d->cursor_->rect().left();
1257         int cur_y = d->cursor_->rect().bottom();
1258
1259         // redraw area of preedit string.
1260         update(0, cur_y - height, viewport()->width(),
1261                 (height + 1) * d->preedit_lines_);
1262
1263         if (preedit_string.empty()) {
1264                 last_width = false;
1265                 d->preedit_lines_ = 1;
1266                 e->accept();
1267                 return;
1268         }
1269         last_width = true;
1270
1271         // att : stores an IM attribute.
1272         QList<QInputMethodEvent::Attribute> const & att = e->attributes();
1273
1274         // get attributes of input method cursor.
1275         // cursor_pos : cursor position in preedit string.
1276         size_t cursor_pos = 0;
1277         bool cursor_is_visible = false;
1278         for (int i = 0; i != att.size(); ++i) {
1279                 if (att.at(i).type == QInputMethodEvent::Cursor) {
1280                         cursor_pos = att.at(i).start;
1281                         cursor_is_visible = att.at(i).length != 0;
1282                         break;
1283                 }
1284         }
1285
1286         size_t preedit_length = preedit_string.length();
1287
1288         // get position of selection in input method.
1289         // FIXME: isn't there a way to do this simplier?
1290         // rStart : cursor position in selected string in IM.
1291         size_t rStart = 0;
1292         // rLength : selected string length in IM.
1293         size_t rLength = 0;
1294         if (cursor_pos < preedit_length) {
1295                 for (int i = 0; i != att.size(); ++i) {
1296                         if (att.at(i).type == QInputMethodEvent::TextFormat) {
1297                                 if (att.at(i).start <= int(cursor_pos)
1298                                         && int(cursor_pos) < att.at(i).start + att.at(i).length) {
1299                                                 rStart = att.at(i).start;
1300                                                 rLength = att.at(i).length;
1301                                                 if (!cursor_is_visible)
1302                                                         cursor_pos += rLength;
1303                                                 break;
1304                                 }
1305                         }
1306                 }
1307         }
1308         else {
1309                 rStart = cursor_pos;
1310                 rLength = 0;
1311         }
1312
1313         int const right_margin = d->buffer_view_->rightMargin();
1314         Painter::preedit_style ps;
1315         // Most often there would be only one line:
1316         d->preedit_lines_ = 1;
1317         for (size_t pos = 0; pos != preedit_length; ++pos) {
1318                 char_type const typed_char = preedit_string[pos];
1319                 // reset preedit string style
1320                 ps = Painter::preedit_default;
1321
1322                 // if we reached the right extremity of the screen, go to next line.
1323                 if (cur_x + fm.width(typed_char) > viewport()->width() - right_margin) {
1324                         cur_x = right_margin;
1325                         cur_y += height + 1;
1326                         ++d->preedit_lines_;
1327                 }
1328                 // preedit strings are displayed with dashed underline
1329                 // and partial strings are displayed white on black indicating
1330                 // that we are in selecting mode in the input method.
1331                 // FIXME: rLength == preedit_length is not a changing condition
1332                 // FIXME: should be put out of the loop.
1333                 if (pos >= rStart
1334                         && pos < rStart + rLength
1335                         && !(cursor_pos < rLength && rLength == preedit_length))
1336                         ps = Painter::preedit_selecting;
1337
1338                 if (pos == cursor_pos
1339                         && (cursor_pos < rLength && rLength == preedit_length))
1340                         ps = Painter::preedit_cursor;
1341
1342                 // draw one character and update cur_x.
1343                 cur_x += pain.preeditText(cur_x, cur_y, typed_char, font, ps);
1344         }
1345
1346         // update the preedit string screen area.
1347         update(0, cur_y - d->preedit_lines_*height, viewport()->width(),
1348                 (height + 1) * d->preedit_lines_);
1349
1350         // Don't forget to accept the event!
1351         e->accept();
1352 }
1353
1354
1355 QVariant GuiWorkArea::inputMethodQuery(Qt::InputMethodQuery query) const
1356 {
1357         QRect cur_r(0, 0, 0, 0);
1358         switch (query) {
1359                 // this is the CJK-specific composition window position and
1360                 // the context menu position when the menu key is pressed.
1361                 case Qt::ImMicroFocus:
1362                         cur_r = d->cursor_->rect();
1363                         if (d->preedit_lines_ != 1)
1364                                 cur_r.moveLeft(10);
1365                         cur_r.moveBottom(cur_r.bottom()
1366                                 + cur_r.height() * (d->preedit_lines_ - 1));
1367                         // return lower right of cursor in LyX.
1368                         return cur_r;
1369                 default:
1370                         return QWidget::inputMethodQuery(query);
1371         }
1372 }
1373
1374
1375 void GuiWorkArea::updateWindowTitle()
1376 {
1377         docstring maximize_title;
1378         docstring minimize_title;
1379
1380         Buffer const & buf = d->buffer_view_->buffer();
1381         FileName const file_name = buf.fileName();
1382         if (!file_name.empty()) {
1383                 maximize_title = file_name.displayName(130);
1384                 minimize_title = from_utf8(file_name.onlyFileName());
1385                 if (buf.lyxvc().inUse()) {
1386                         if (buf.lyxvc().locking())
1387                                 maximize_title +=  _(" (version control, locking)");
1388                         else
1389                                 maximize_title +=  _(" (version control)");
1390                 }
1391                 if (!buf.isClean()) {
1392                         maximize_title += _(" (changed)");
1393                         minimize_title += char_type('*');
1394                 }
1395                 if (buf.isReadonly())
1396                         maximize_title += _(" (read only)");
1397         }
1398
1399         QString const new_title = toqstr(maximize_title);
1400         if (new_title != windowTitle()) {
1401                 QWidget::setWindowTitle(new_title);
1402                 QWidget::setWindowIconText(toqstr(minimize_title));
1403                 titleChanged(this);
1404         }
1405 }
1406
1407
1408 bool GuiWorkArea::isFullScreen() const
1409 {
1410         return d->lyx_view_ && d->lyx_view_->isFullScreen();
1411 }
1412
1413
1414 void GuiWorkArea::scheduleRedraw()
1415 {
1416         d->schedule_redraw_ = true;
1417 }
1418
1419
1420 bool GuiWorkArea::inDialogMode() const
1421 {
1422         return d->dialog_mode_;
1423 }
1424
1425
1426 void GuiWorkArea::setDialogMode(bool mode)
1427 {
1428         d->dialog_mode_ = mode;
1429 }
1430
1431
1432 GuiCompleter & GuiWorkArea::completer()
1433 {
1434         return *d->completer_;
1435 }
1436
1437 GuiView const & GuiWorkArea::view() const
1438 {
1439         return *d->lyx_view_;
1440 }
1441
1442
1443 GuiView & GuiWorkArea::view()
1444 {
1445         return *d->lyx_view_;
1446 }
1447
1448 ////////////////////////////////////////////////////////////////////
1449 //
1450 // EmbeddedWorkArea
1451 //
1452 ////////////////////////////////////////////////////////////////////
1453
1454
1455 EmbeddedWorkArea::EmbeddedWorkArea(QWidget * w): GuiWorkArea(w)
1456 {
1457         support::TempFile tempfile("embedded.internal");
1458         tempfile.setAutoRemove(false);
1459         buffer_ = theBufferList().newInternalBuffer(tempfile.name().absFileName());
1460         buffer_->setUnnamed(true);
1461         buffer_->setFullyLoaded(true);
1462         setBuffer(*buffer_);
1463         setDialogMode(true);
1464 }
1465
1466
1467 EmbeddedWorkArea::~EmbeddedWorkArea()
1468 {
1469         // No need to destroy buffer and bufferview here, because it is done
1470         // in theBufferList() destruction loop at application exit
1471 }
1472
1473
1474 void EmbeddedWorkArea::closeEvent(QCloseEvent * ev)
1475 {
1476         disable();
1477         GuiWorkArea::closeEvent(ev);
1478 }
1479
1480
1481 void EmbeddedWorkArea::hideEvent(QHideEvent * ev)
1482 {
1483         disable();
1484         GuiWorkArea::hideEvent(ev);
1485 }
1486
1487
1488 QSize EmbeddedWorkArea::sizeHint () const
1489 {
1490         // FIXME(?):
1491         // GuiWorkArea sets the size to the screen's viewport
1492         // by returning a value this gets overridden
1493         // EmbeddedWorkArea is now sized to fit in the layout
1494         // of the parent, and has a minimum size set in GuiWorkArea
1495         // which is what we return here
1496         return QSize(100, 70);
1497 }
1498
1499
1500 void EmbeddedWorkArea::disable()
1501 {
1502         stopBlinkingCursor();
1503         if (view().currentWorkArea() != this)
1504                 return;
1505         // No problem if currentMainWorkArea() is 0 (setCurrentWorkArea()
1506         // tolerates it and shows the background logo), what happens if
1507         // an EmbeddedWorkArea is closed after closing all document WAs
1508         view().setCurrentWorkArea(view().currentMainWorkArea());
1509 }
1510
1511 ////////////////////////////////////////////////////////////////////
1512 //
1513 // TabWorkArea
1514 //
1515 ////////////////////////////////////////////////////////////////////
1516
1517 #ifdef Q_OS_MAC
1518 class NoTabFrameMacStyle : public QProxyStyle {
1519 public:
1520         ///
1521         QRect subElementRect(SubElement element, const QStyleOption * option,
1522                              const QWidget * widget = 0) const
1523         {
1524                 QRect rect = QProxyStyle::subElementRect(element, option, widget);
1525                 bool noBar = static_cast<QTabWidget const *>(widget)->count() <= 1;
1526
1527                 // The Qt Mac style puts the contents into a 3 pixel wide box
1528                 // which looks very ugly and not like other Mac applications.
1529                 // Hence we remove this here, and moreover the 16 pixel round
1530                 // frame above if the tab bar is hidden.
1531                 if (element == QStyle::SE_TabWidgetTabContents) {
1532                         rect.adjust(- rect.left(), 0, rect.left(), 0);
1533                         if (noBar)
1534                                 rect.setTop(0);
1535                 }
1536
1537                 return rect;
1538         }
1539 };
1540
1541 NoTabFrameMacStyle noTabFrameMacStyle;
1542 #endif
1543
1544
1545 TabWorkArea::TabWorkArea(QWidget * parent)
1546         : QTabWidget(parent), clicked_tab_(-1)
1547 {
1548 #ifdef Q_OS_MAC
1549         setStyle(&noTabFrameMacStyle);
1550 #endif
1551
1552         QPalette pal = palette();
1553         pal.setColor(QPalette::Active, QPalette::Button,
1554                 pal.color(QPalette::Active, QPalette::Window));
1555         pal.setColor(QPalette::Disabled, QPalette::Button,
1556                 pal.color(QPalette::Disabled, QPalette::Window));
1557         pal.setColor(QPalette::Inactive, QPalette::Button,
1558                 pal.color(QPalette::Inactive, QPalette::Window));
1559
1560         QObject::connect(this, SIGNAL(currentChanged(int)),
1561                 this, SLOT(on_currentTabChanged(int)));
1562
1563         closeBufferButton = new QToolButton(this);
1564         closeBufferButton->setPalette(pal);
1565         // FIXME: rename the icon to closebuffer.png
1566         closeBufferButton->setIcon(QIcon(getPixmap("images/", "closetab", "svgz,png")));
1567         closeBufferButton->setText("Close File");
1568         closeBufferButton->setAutoRaise(true);
1569         closeBufferButton->setCursor(Qt::ArrowCursor);
1570         closeBufferButton->setToolTip(qt_("Close File"));
1571         closeBufferButton->setEnabled(true);
1572         QObject::connect(closeBufferButton, SIGNAL(clicked()),
1573                 this, SLOT(closeCurrentBuffer()));
1574         setCornerWidget(closeBufferButton, Qt::TopRightCorner);
1575
1576         // setup drag'n'drop
1577         QTabBar* tb = new DragTabBar;
1578         connect(tb, SIGNAL(tabMoveRequested(int, int)),
1579                 this, SLOT(moveTab(int, int)));
1580         tb->setElideMode(Qt::ElideNone);
1581         setTabBar(tb);
1582
1583         // make us responsible for the context menu of the tabbar
1584         tb->setContextMenuPolicy(Qt::CustomContextMenu);
1585         connect(tb, SIGNAL(customContextMenuRequested(const QPoint &)),
1586                 this, SLOT(showContextMenu(const QPoint &)));
1587         connect(tb, SIGNAL(tabCloseRequested(int)),
1588                 this, SLOT(closeTab(int)));
1589
1590         setUsesScrollButtons(true);
1591 }
1592
1593
1594 void TabWorkArea::paintEvent(QPaintEvent * event)
1595 {
1596         if (tabBar()->isVisible()) {
1597                 QTabWidget::paintEvent(event);
1598         } else {
1599                 // Prevent the selected tab to influence the
1600                 // painting of the frame of the tab widget.
1601                 // This is needed for gtk style in Qt.
1602                 QStylePainter p(this);
1603 #if QT_VERSION < 0x050000
1604                 QStyleOptionTabWidgetFrameV2 opt;
1605 #else
1606                 QStyleOptionTabWidgetFrame opt;
1607 #endif
1608                 initStyleOption(&opt);
1609                 opt.rect = style()->subElementRect(QStyle::SE_TabWidgetTabPane,
1610                         &opt, this);
1611                 opt.selectedTabRect = QRect();
1612                 p.drawPrimitive(QStyle::PE_FrameTabWidget, opt);
1613         }
1614 }
1615
1616
1617 void TabWorkArea::mouseDoubleClickEvent(QMouseEvent * event)
1618 {
1619         if (event->button() != Qt::LeftButton)
1620                 return;
1621
1622         // return early if double click on existing tabs
1623         for (int i = 0; i < count(); ++i)
1624                 if (tabBar()->tabRect(i).contains(event->pos()))
1625                         return;
1626
1627         dispatch(FuncRequest(LFUN_BUFFER_NEW));
1628 }
1629
1630
1631 void TabWorkArea::setFullScreen(bool full_screen)
1632 {
1633         for (int i = 0; i != count(); ++i) {
1634                 if (GuiWorkArea * wa = workArea(i))
1635                         wa->setFullScreen(full_screen);
1636         }
1637
1638         if (lyxrc.full_screen_tabbar)
1639                 showBar(!full_screen && count() > 1);
1640         else
1641                 showBar(count() > 1);
1642 }
1643
1644
1645 void TabWorkArea::showBar(bool show)
1646 {
1647         tabBar()->setEnabled(show);
1648         tabBar()->setVisible(show);
1649         closeBufferButton->setVisible(show && lyxrc.single_close_tab_button);
1650         setTabsClosable(!lyxrc.single_close_tab_button);
1651 }
1652
1653
1654 GuiWorkArea * TabWorkArea::currentWorkArea()
1655 {
1656         if (count() == 0)
1657                 return 0;
1658
1659         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(currentWidget());
1660         LATTEST(wa);
1661         return wa;
1662 }
1663
1664
1665 GuiWorkArea * TabWorkArea::workArea(int index)
1666 {
1667         return dynamic_cast<GuiWorkArea *>(widget(index));
1668 }
1669
1670
1671 GuiWorkArea * TabWorkArea::workArea(Buffer & buffer)
1672 {
1673         // FIXME: this method doesn't work if we have more than work area
1674         // showing the same buffer.
1675         for (int i = 0; i != count(); ++i) {
1676                 GuiWorkArea * wa = workArea(i);
1677                 LASSERT(wa, return 0);
1678                 if (&wa->bufferView().buffer() == &buffer)
1679                         return wa;
1680         }
1681         return 0;
1682 }
1683
1684
1685 void TabWorkArea::closeAll()
1686 {
1687         while (count()) {
1688                 GuiWorkArea * wa = workArea(0);
1689                 LASSERT(wa, return);
1690                 removeTab(0);
1691                 delete wa;
1692         }
1693 }
1694
1695
1696 bool TabWorkArea::setCurrentWorkArea(GuiWorkArea * work_area)
1697 {
1698         LASSERT(work_area, return false);
1699         int index = indexOf(work_area);
1700         if (index == -1)
1701                 return false;
1702
1703         if (index == currentIndex())
1704                 // Make sure the work area is up to date.
1705                 on_currentTabChanged(index);
1706         else
1707                 // Switch to the work area.
1708                 setCurrentIndex(index);
1709         work_area->setFocus();
1710
1711         return true;
1712 }
1713
1714
1715 GuiWorkArea * TabWorkArea::addWorkArea(Buffer & buffer, GuiView & view)
1716 {
1717         GuiWorkArea * wa = new GuiWorkArea(buffer, view);
1718         wa->setUpdatesEnabled(false);
1719         // Hide tabbar if there's no tab (avoid a resize and a flashing tabbar
1720         // when hiding it again below).
1721         if (!(currentWorkArea() && currentWorkArea()->isFullScreen()))
1722                 showBar(count() > 0);
1723         addTab(wa, wa->windowTitle());
1724         QObject::connect(wa, SIGNAL(titleChanged(GuiWorkArea *)),
1725                 this, SLOT(updateTabTexts()));
1726         if (currentWorkArea() && currentWorkArea()->isFullScreen())
1727                 setFullScreen(true);
1728         else
1729                 // Hide tabbar if there's only one tab.
1730                 showBar(count() > 1);
1731
1732         updateTabTexts();
1733
1734         return wa;
1735 }
1736
1737
1738 bool TabWorkArea::removeWorkArea(GuiWorkArea * work_area)
1739 {
1740         LASSERT(work_area, return false);
1741         int index = indexOf(work_area);
1742         if (index == -1)
1743                 return false;
1744
1745         work_area->setUpdatesEnabled(false);
1746         removeTab(index);
1747         delete work_area;
1748
1749         if (count()) {
1750                 // make sure the next work area is enabled.
1751                 currentWidget()->setUpdatesEnabled(true);
1752                 if (currentWorkArea() && currentWorkArea()->isFullScreen())
1753                         setFullScreen(true);
1754                 else
1755                         // Show tabbar only if there's more than one tab.
1756                         showBar(count() > 1);
1757         } else
1758                 lastWorkAreaRemoved();
1759
1760         updateTabTexts();
1761
1762         return true;
1763 }
1764
1765
1766 void TabWorkArea::on_currentTabChanged(int i)
1767 {
1768         // returns e.g. on application destruction
1769         if (i == -1)
1770                 return;
1771         GuiWorkArea * wa = workArea(i);
1772         LASSERT(wa, return);
1773         wa->setUpdatesEnabled(true);
1774         wa->redraw(true);
1775         wa->setFocus();
1776         ///
1777         currentWorkAreaChanged(wa);
1778
1779         LYXERR(Debug::GUI, "currentTabChanged " << i
1780                 << " File: " << wa->bufferView().buffer().absFileName());
1781 }
1782
1783
1784 void TabWorkArea::closeCurrentBuffer()
1785 {
1786         GuiWorkArea * wa;
1787         if (clicked_tab_ == -1)
1788                 wa = currentWorkArea();
1789         else {
1790                 wa = workArea(clicked_tab_);
1791                 LASSERT(wa, return);
1792         }
1793         wa->view().closeWorkArea(wa);
1794 }
1795
1796
1797 void TabWorkArea::hideCurrentTab()
1798 {
1799         GuiWorkArea * wa;
1800         if (clicked_tab_ == -1)
1801                 wa = currentWorkArea();
1802         else {
1803                 wa = workArea(clicked_tab_);
1804                 LASSERT(wa, return);
1805         }
1806         wa->view().hideWorkArea(wa);
1807 }
1808
1809
1810 void TabWorkArea::closeTab(int index)
1811 {
1812         on_currentTabChanged(index);
1813         GuiWorkArea * wa;
1814         if (index == -1)
1815                 wa = currentWorkArea();
1816         else {
1817                 wa = workArea(index);
1818                 LASSERT(wa, return);
1819         }
1820         wa->view().closeWorkArea(wa);
1821 }
1822
1823
1824 ///
1825 class DisplayPath {
1826 public:
1827         /// make vector happy
1828         DisplayPath() {}
1829         ///
1830         DisplayPath(int tab, FileName const & filename)
1831                 : tab_(tab)
1832         {
1833                 filename_ = (filename.extension() == "lyx") ?
1834                         toqstr(filename.onlyFileNameWithoutExt())
1835                         : toqstr(filename.onlyFileName());
1836                 postfix_ = toqstr(filename.absoluteFilePath()).
1837                         split("/", QString::SkipEmptyParts);
1838                 postfix_.pop_back();
1839                 abs_ = toqstr(filename.absoluteFilePath());
1840                 dottedPrefix_ = false;
1841         }
1842
1843         /// Absolute path for debugging.
1844         QString abs() const
1845         {
1846                 return abs_;
1847         }
1848         /// Add the first segment from the postfix or three dots to the prefix.
1849         /// Merge multiple dot tripples. In fact dots are added lazily, i.e. only
1850         /// when really needed.
1851         void shiftPathSegment(bool dotted)
1852         {
1853                 if (postfix_.count() <= 0)
1854                         return;
1855
1856                 if (!dotted) {
1857                         if (dottedPrefix_ && !prefix_.isEmpty())
1858                                 prefix_ += ellipsisSlash_;
1859                         prefix_ += postfix_.front() + "/";
1860                 }
1861                 dottedPrefix_ = dotted && !prefix_.isEmpty();
1862                 postfix_.pop_front();
1863         }
1864         ///
1865         QString displayString() const
1866         {
1867                 if (prefix_.isEmpty())
1868                         return filename_;
1869
1870                 bool dots = dottedPrefix_ || !postfix_.isEmpty();
1871                 return prefix_ + (dots ? ellipsisSlash_ : "") + filename_;
1872         }
1873         ///
1874         QString forecastPathString() const
1875         {
1876                 if (postfix_.count() == 0)
1877                         return displayString();
1878
1879                 return prefix_
1880                         + (dottedPrefix_ ? ellipsisSlash_ : "")
1881                         + postfix_.front() + "/";
1882         }
1883         ///
1884         bool final() const { return postfix_.empty(); }
1885         ///
1886         int tab() const { return tab_; }
1887
1888 private:
1889         /// ".../"
1890         static QString const ellipsisSlash_;
1891         ///
1892         QString prefix_;
1893         ///
1894         QStringList postfix_;
1895         ///
1896         QString filename_;
1897         ///
1898         QString abs_;
1899         ///
1900         int tab_;
1901         ///
1902         bool dottedPrefix_;
1903 };
1904
1905
1906 QString const DisplayPath::ellipsisSlash_ = QString(QChar(0x2026)) + "/";
1907
1908
1909 ///
1910 bool operator<(DisplayPath const & a, DisplayPath const & b)
1911 {
1912         return a.displayString() < b.displayString();
1913 }
1914
1915 ///
1916 bool operator==(DisplayPath const & a, DisplayPath const & b)
1917 {
1918         return a.displayString() == b.displayString();
1919 }
1920
1921
1922 void TabWorkArea::updateTabTexts()
1923 {
1924         size_t n = count();
1925         if (n == 0)
1926                 return;
1927         std::list<DisplayPath> paths;
1928         typedef std::list<DisplayPath>::iterator It;
1929
1930         // collect full names first: path into postfix, empty prefix and
1931         // filename without extension
1932         for (size_t i = 0; i < n; ++i) {
1933                 GuiWorkArea * i_wa = workArea(i);
1934                 FileName const fn = i_wa->bufferView().buffer().fileName();
1935                 paths.push_back(DisplayPath(i, fn));
1936         }
1937
1938         // go through path segments and see if it helps to make the path more unique
1939         bool somethingChanged = true;
1940         bool allFinal = false;
1941         while (somethingChanged && !allFinal) {
1942                 // adding path segments changes order
1943                 paths.sort();
1944
1945                 LYXERR(Debug::GUI, "updateTabTexts() iteration start");
1946                 somethingChanged = false;
1947                 allFinal = true;
1948
1949                 // find segments which are not unique (i.e. non-atomic)
1950                 It it = paths.begin();
1951                 It segStart = it;
1952                 QString segString = it->displayString();
1953                 for (; it != paths.end(); ++it) {
1954                         // look to the next item
1955                         It next = it;
1956                         ++next;
1957
1958                         // final?
1959                         allFinal = allFinal && it->final();
1960
1961                         LYXERR(Debug::GUI, "it = " << it->abs()
1962                                << " => " << it->displayString());
1963
1964                         // still the same segment?
1965                         QString nextString;
1966                         if ((next != paths.end()
1967                              && (nextString = next->displayString()) == segString))
1968                                 continue;
1969                         LYXERR(Debug::GUI, "segment ended");
1970
1971                         // only a trivial one with one element?
1972                         if (it == segStart) {
1973                                 // start new segment
1974                                 segStart = next;
1975                                 segString = nextString;
1976                                 continue;
1977                         }
1978
1979                         // we found a non-atomic segment segStart <= sit <= it < next.
1980                         // Shift path segments and hope for the best
1981                         // that it makes the path more unique.
1982                         somethingChanged = true;
1983                         It sit = segStart;
1984                         QString dspString = sit->forecastPathString();
1985                         LYXERR(Debug::GUI, "first forecast found for "
1986                                << sit->abs() << " => " << dspString);
1987                         ++sit;
1988                         bool moreUnique = false;
1989                         for (; sit != next; ++sit) {
1990                                 if (sit->forecastPathString() != dspString) {
1991                                         LYXERR(Debug::GUI, "different forecast found for "
1992                                                 << sit->abs() << " => " << sit->forecastPathString());
1993                                         moreUnique = true;
1994                                         break;
1995                                 }
1996                                 LYXERR(Debug::GUI, "same forecast found for "
1997                                         << sit->abs() << " => " << dspString);
1998                         }
1999
2000                         // if the path segment helped, add it. Otherwise add dots
2001                         bool dots = !moreUnique;
2002                         LYXERR(Debug::GUI, "using dots = " << dots);
2003                         for (sit = segStart; sit != next; ++sit) {
2004                                 sit->shiftPathSegment(dots);
2005                                 LYXERR(Debug::GUI, "shifting "
2006                                         << sit->abs() << " => " << sit->displayString());
2007                         }
2008
2009                         // start new segment
2010                         segStart = next;
2011                         segString = nextString;
2012                 }
2013         }
2014
2015         // set new tab titles
2016         for (It it = paths.begin(); it != paths.end(); ++it) {
2017                 int const tab_index = it->tab();
2018                 Buffer const & buf = workArea(tab_index)->bufferView().buffer();
2019                 QString tab_text = it->displayString().replace("&", "&&");
2020                 if (!buf.fileName().empty() && !buf.isClean())
2021                         tab_text += "*";
2022                 QString tab_tooltip = it->abs();
2023                 if (buf.isReadonly()) {
2024                         setTabIcon(tab_index, QIcon(getPixmap("images/", "emblem-readonly", "svgz,png")));
2025                         tab_tooltip = qt_("%1 (read only)").arg(it->abs());
2026                 } else
2027                         setTabIcon(tab_index, QIcon());
2028                 setTabText(tab_index, tab_text);
2029                 setTabToolTip(tab_index, tab_tooltip);
2030         }
2031 }
2032
2033
2034 void TabWorkArea::showContextMenu(const QPoint & pos)
2035 {
2036         // which tab?
2037         clicked_tab_ = static_cast<DragTabBar *>(tabBar())->tabAt(pos);
2038         if (clicked_tab_ == -1)
2039                 return;
2040
2041         // show tab popup
2042         QMenu popup;
2043         popup.addAction(QIcon(getPixmap("images/", "hidetab", "svgz,png")),
2044                 qt_("Hide tab"), this, SLOT(hideCurrentTab()));
2045         popup.addAction(QIcon(getPixmap("images/", "closetab", "svgz,png")),
2046                 qt_("Close tab"), this, SLOT(closeCurrentBuffer()));
2047         popup.exec(tabBar()->mapToGlobal(pos));
2048
2049         clicked_tab_ = -1;
2050 }
2051
2052
2053 void TabWorkArea::moveTab(int fromIndex, int toIndex)
2054 {
2055         QWidget * w = widget(fromIndex);
2056         QIcon icon = tabIcon(fromIndex);
2057         QString text = tabText(fromIndex);
2058
2059         setCurrentIndex(fromIndex);
2060         removeTab(fromIndex);
2061         insertTab(toIndex, w, icon, text);
2062         setCurrentIndex(toIndex);
2063 }
2064
2065
2066 DragTabBar::DragTabBar(QWidget* parent)
2067         : QTabBar(parent)
2068 {
2069         setAcceptDrops(true);
2070         setTabsClosable(!lyxrc.single_close_tab_button);
2071 }
2072
2073
2074 void DragTabBar::mousePressEvent(QMouseEvent * event)
2075 {
2076         if (event->button() == Qt::LeftButton)
2077                 dragStartPos_ = event->pos();
2078         QTabBar::mousePressEvent(event);
2079 }
2080
2081
2082 void DragTabBar::mouseMoveEvent(QMouseEvent * event)
2083 {
2084         // If the left button isn't pressed anymore then return
2085         if (!(event->buttons() & Qt::LeftButton))
2086                 return;
2087
2088         // If the distance is too small then return
2089         if ((event->pos() - dragStartPos_).manhattanLength()
2090             < QApplication::startDragDistance())
2091                 return;
2092
2093         // did we hit something after all?
2094         int tab = tabAt(dragStartPos_);
2095         if (tab == -1)
2096                 return;
2097
2098         // simulate button release to remove highlight from button
2099         int i = currentIndex();
2100         QMouseEvent me(QEvent::MouseButtonRelease, dragStartPos_,
2101                 event->button(), event->buttons(), 0);
2102         QTabBar::mouseReleaseEvent(&me);
2103         setCurrentIndex(i);
2104
2105         // initiate Drag
2106         QDrag * drag = new QDrag(this);
2107         QMimeData * mimeData = new QMimeData;
2108         // a crude way to distinguish tab-reodering drops from other ones
2109         mimeData->setData("action", "tab-reordering") ;
2110         drag->setMimeData(mimeData);
2111
2112         // get tab pixmap as cursor
2113         QRect r = tabRect(tab);
2114         QPixmap pixmap(r.size());
2115         render(&pixmap, - r.topLeft());
2116         drag->setPixmap(pixmap);
2117         drag->exec();
2118 }
2119
2120
2121 void DragTabBar::dragEnterEvent(QDragEnterEvent * event)
2122 {
2123         // Only accept if it's an tab-reordering request
2124         QMimeData const * m = event->mimeData();
2125         QStringList formats = m->formats();
2126         if (formats.contains("action")
2127             && m->data("action") == "tab-reordering")
2128                 event->acceptProposedAction();
2129 }
2130
2131
2132 void DragTabBar::dropEvent(QDropEvent * event)
2133 {
2134         int fromIndex = tabAt(dragStartPos_);
2135         int toIndex = tabAt(event->pos());
2136
2137         // Tell interested objects that
2138         if (fromIndex != toIndex)
2139                 tabMoveRequested(fromIndex, toIndex);
2140         event->acceptProposedAction();
2141 }
2142
2143
2144 } // namespace frontend
2145 } // namespace lyx
2146
2147 #include "moc_GuiWorkArea.cpp"