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
  16 #include "Buffer.h"
  17 #include "BufferParams.h"
  18 #include "BufferView.h"
  19 #include "CoordCache.h"
  20 #include "Cursor.h"
  21 #include "Font.h"
  22 #include "FuncRequest.h"
  23 #include "GuiApplication.h"
  24 #include "GuiCompleter.h"
  25 #include "GuiKeySymbol.h"
  26 #include "GuiPainter.h"
  27 #include "GuiView.h"
  28 #include "KeySymbol.h"
  29 #include "Language.h"
  30 #include "LyXFunc.h"
  31 #include "LyXRC.h"
  32 #include "MetricsInfo.h"
  33 #include "qt_helpers.h"
  34 #include "Text.h"
  35 #include "version.h"
  36
  37 #include "graphics/GraphicsImage.h"
  38 #include "graphics/GraphicsLoader.h"
  39
  40 #include "support/debug.h"
  41 #include "support/gettext.h"
  42 #include "support/FileName.h"
  43
  44 #include "frontends/Application.h"
  45 #include "frontends/FontMetrics.h"
  46 #include "frontends/WorkAreaManager.h"
  47
  48 #include <QContextMenuEvent>
  49 #include <QInputContext>
  50 #include <QHelpEvent>
  51 #ifdef Q_WS_MACX
  52 #include <QMacStyle>
  53 #endif
  54 #include <QMainWindow>
  55 #include <QMenu>
  56 #include <QPainter>
  57 #include <QPalette>
  58 #include <QPixmapCache>
  59 #include <QScrollBar>
  60 #include <QTimer>
  61 #include <QToolButton>
  62 #include <QToolTip>
  63
  64 #include <boost/bind.hpp>
  65
  66 #ifdef Q_WS_X11
  67 #include <QX11Info>
  68 extern "C" int XEventsQueued(Display *display, int mode);
  69 #endif
  70
  71 #ifdef Q_WS_WIN
  72 int const CursorWidth = 2;
  73 #else
  74 int const CursorWidth = 1;
  75 #endif
  76 int const TabIndicatorWidth = 3;
  77
  78 #undef KeyPress
  79 #undef NoModifier
  80
  81 using namespace std;
  82 using namespace lyx::support;
  83
  84 namespace lyx {
  85
  86
  87 /// return the LyX mouse button state from Qt's
  88 static mouse_button::state q_button_state(Qt::MouseButton button)
  89 {
  90         mouse_button::state b = mouse_button::none;
  91         switch (button) {
  92                 case Qt::LeftButton:
  93                         b = mouse_button::button1;
  94                         break;
  95                 case Qt::MidButton:
  96                         b = mouse_button::button2;
  97                         break;
  98                 case Qt::RightButton:
  99                         b = mouse_button::button3;
 100                         break;
 101                 default:
 102                         break;
 103         }
 104         return b;
 105 }
 106
 107
 108 /// return the LyX mouse button state from Qt's
 109 mouse_button::state q_motion_state(Qt::MouseButtons state)
 110 {
 111         mouse_button::state b = mouse_button::none;
 112         if (state & Qt::LeftButton)
 113                 b |= mouse_button::button1;
 114         if (state & Qt::MidButton)
 115                 b |= mouse_button::button2;
 116         if (state & Qt::RightButton)
 117                 b |= mouse_button::button3;
 118         return b;
 119 }
 120
 121
 122 namespace frontend {
 123
 124 class CursorWidget {
 125 public:
 126         CursorWidget() {}
 127
 128         void draw(QPainter & painter)
 129         {
 130                 if (!show_ || !rect_.isValid())
 131                         return;
 132
 133                 int y = rect_.top();
 134                 int l = x_ - rect_.left();
 135                 int r = rect_.right() - x_;
 136                 int bot = rect_.bottom();
 137
 138                 // draw vertica linel
 139                 painter.fillRect(x_, y, CursorWidth, rect_.height(), color_);
 140
 141                 // draw RTL/LTR indication
 142                 painter.setPen(color_);
 143                 if (l_shape_) {
 144                         if (rtl_)
 145                                 painter.drawLine(x_, bot, x_ - l, bot);
 146                         else
 147                                 painter.drawLine(x_, bot, x_ + CursorWidth + r, bot);
 148                 }
 149
 150                 // draw completion triangle
 151                 if (completable_) {
 152                         int m = y + rect_.height() / 2;
 153                         int d = TabIndicatorWidth - 1;
 154                         if (rtl_) {
 155                                 painter.drawLine(x_ - 1, m - d, x_ - 1 - d, m);
 156                                 painter.drawLine(x_ - 1, m + d, x_ - 1 - d, m);
 157                         } else {
 158                                 painter.drawLine(x_ + CursorWidth, m - d, x_ + CursorWidth + d, m);
 159                                 painter.drawLine(x_ + CursorWidth, m + d, x_ + CursorWidth + d, m);
 160                         }
 161                 }
 162         }
 163
 164         void update(int x, int y, int h, bool l_shape,
 165                 bool rtl, bool completable)
 166         {
 167                 color_ = guiApp->colorCache().get(Color_cursor);
 168                 l_shape_ = l_shape;
 169                 rtl_ = rtl;
 170                 completable_ = completable;
 171                 x_ = x;
 172
 173                 // extension to left and right
 174                 int l = 0;
 175                 int r = 0;
 176
 177                 // RTL/LTR indication
 178                 if (l_shape_) {
 179                         if (rtl)
 180                                 l += h / 3;
 181                         else
 182                                 r += h / 3;
 183                 }
 184
 185                 // completion triangle
 186                 if (completable_) {
 187                         if (rtl)
 188                                 l = max(l, TabIndicatorWidth);
 189                         else
 190                                 r = max(r, TabIndicatorWidth);
 191                 }
 192
 193                 // compute overall rectangle
 194                 rect_ = QRect(x - l, y, CursorWidth + r + l, h);
 195         }
 196
 197         void show(bool set_show = true) { show_ = set_show; }
 198         void hide() { show_ = false; }
 199
 200         QRect const & rect() { return rect_; }
 201
 202 private:
 203         /// cursor is in RTL or LTR text
 204         bool rtl_;
 205         /// indication for RTL or LTR
 206         bool l_shape_;
 207         /// triangle to show that a completion is available
 208         bool completable_;
 209         ///
 210         bool show_;
 211         ///
 212         QColor color_;
 213         /// rectangle, possibly with l_shape and completion triangle
 214         QRect rect_;
 215         /// x position (were the vertical line is drawn)
 216         int x_;
 217 };
 218
 219
 220 // This is a 'heartbeat' generating synthetic mouse move events when the
 221 // cursor is at the top or bottom edge of the viewport. One scroll per 0.2 s
 222 SyntheticMouseEvent::SyntheticMouseEvent()
 223         : timeout(200), restart_timeout(true),
 224           x_old(-1), y_old(-1), scrollbar_value_old(-1.0)
 225 {}
 226
 227
 228
 229 GuiWorkArea::GuiWorkArea(Buffer & buffer, GuiView & lv)
 230         : buffer_view_(new BufferView(buffer)), lyx_view_(&lv),
 231         cursor_visible_(false),
 232         need_resize_(false), schedule_redraw_(false),
 233         preedit_lines_(1), completer_(new GuiCompleter(this))
 234 {
 235         buffer.workAreaManager().add(this);
 236         // Setup the signals
 237         connect(&cursor_timeout_, SIGNAL(timeout()),
 238                 this, SLOT(toggleCursor()));
 239
 240         int const time = QApplication::cursorFlashTime() / 2;
 241         if (time > 0) {
 242                 cursor_timeout_.setInterval(time);
 243                 cursor_timeout_.start();
 244         } else {
 245                 // let's initialize this just to be safe
 246                 cursor_timeout_.setInterval(500);
 247         }
 248
 249         screen_ = QPixmap(viewport()->width(), viewport()->height());
 250         cursor_ = new frontend::CursorWidget();
 251         cursor_->hide();
 252
 253         // HACK: Prevents an additional redraw when the scrollbar pops up
 254         // which regularily happens on documents with more than one page.
 255         // The policy  should be set to "Qt::ScrollBarAsNeeded" soon.
 256         // Since we have no geometry information yet, we assume that
 257         // a document needs a scrollbar if there is more then four
 258         // paragraph in the outermost text.
 259         if (buffer.text().paragraphs().size() > 4)
 260                 setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
 261         QTimer::singleShot(50, this, SLOT(fixVerticalScrollBar()));
 262
 263
 264         setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 265         setAcceptDrops(true);
 266         setMouseTracking(true);
 267         setMinimumSize(100, 70);
 268 #ifdef Q_WS_MACX
 269         setFrameStyle(QFrame::NoFrame);
 270 #else
 271         setFrameStyle(QFrame::Box);
 272 #endif
 273         updateWindowTitle();
 274
 275         viewport()->setAutoFillBackground(false);
 276         // We don't need double-buffering nor SystemBackground on
 277         // the viewport because we have our own backing pixmap.
 278         viewport()->setAttribute(Qt::WA_NoSystemBackground);
 279
 280         setFocusPolicy(Qt::WheelFocus);
 281
 282         viewport()->setCursor(Qt::IBeamCursor);
 283
 284         synthetic_mouse_event_.timeout.timeout.connect(
 285                 boost::bind(&GuiWorkArea::generateSyntheticMouseEvent,
 286                                         this));
 287
 288         // Initialize the vertical Scroll Bar
 289         QObject::connect(verticalScrollBar(), SIGNAL(valueChanged(int)),
 290                 this, SLOT(scrollTo(int)));
 291
 292         LYXERR(Debug::GUI, "viewport width: " << viewport()->width()
 293                 << "  viewport height: " << viewport()->height());
 294
 295         // Enables input methods for asian languages.
 296         // Must be set when creating custom text editing widgets.
 297         setAttribute(Qt::WA_InputMethodEnabled, true);
 298 }
 299
 300
 301 GuiWorkArea::~GuiWorkArea()
 302 {
 303         buffer_view_->buffer().workAreaManager().remove(this);
 304         delete buffer_view_;
 305         delete cursor_;
 306 }
 307
 308
 309 void GuiWorkArea::fixVerticalScrollBar()
 310 {
 311         if (!isFullScreen())
 312                 setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
 313 }
 314
 315
 316 void GuiWorkArea::close()
 317 {
 318         lyx_view_->removeWorkArea(this);
 319 }
 320
 321
 322 void GuiWorkArea::setFullScreen(bool full_screen)
 323 {
 324         buffer_view_->setFullScreen(full_screen);
 325         if (full_screen) {
 326                 setFrameStyle(QFrame::NoFrame);
 327                 if (lyxrc.full_screen_scrollbar)
 328                         setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 329         } else {
 330 #ifdef Q_WS_MACX
 331                 setFrameStyle(QFrame::NoFrame);
 332 #else
 333                 setFrameStyle(QFrame::Box);
 334 #endif
 335                 setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
 336         }
 337 }
 338
 339
 340 BufferView & GuiWorkArea::bufferView()
 341 {
 342         return *buffer_view_;
 343 }
 344
 345
 346 BufferView const & GuiWorkArea::bufferView() const
 347 {
 348         return *buffer_view_;
 349 }
 350
 351
 352 void GuiWorkArea::stopBlinkingCursor()
 353 {
 354         cursor_timeout_.stop();
 355         hideCursor();
 356 }
 357
 358
 359 void GuiWorkArea::startBlinkingCursor()
 360 {
 361         showCursor();
 362         //we're not supposed to cache this value.
 363         int const time = QApplication::cursorFlashTime() / 2;
 364         if (time <= 0)
 365                 return;
 366         cursor_timeout_.setInterval(time);
 367         cursor_timeout_.start();
 368 }
 369
 370
 371 void GuiWorkArea::redraw()
 372 {
 373         if (!isVisible())
 374                 // No need to redraw in this case.
 375                 return;
 376
 377         // No need to do anything if this is the current view. The BufferView
 378         // metrics are already up to date.
 379         if (lyx_view_ != guiApp->currentView()
 380                 || lyx_view_->currentWorkArea() != this) {
 381                 // FIXME: it would be nice to optimize for the off-screen case.
 382                 buffer_view_->updateMetrics();
 383                 buffer_view_->cursor().fixIfBroken();
 384         }
 385
 386         // update cursor position, because otherwise it has to wait until
 387         // the blinking interval is over
 388         if (cursor_visible_) {
 389                 hideCursor();
 390                 showCursor();
 391         }
 392
 393         LYXERR(Debug::WORKAREA, "WorkArea::redraw screen");
 394         updateScreen();
 395         update(0, 0, viewport()->width(), viewport()->height());
 396
 397         /// \warning: scrollbar updating *must* be done after the BufferView is drawn
 398         /// because \c BufferView::updateScrollbar() is called in \c BufferView::draw().
 399         updateScrollbar();
 400         lyx_view_->updateStatusBar();
 401
 402         if (lyxerr.debugging(Debug::WORKAREA))
 403                 buffer_view_->coordCache().dump();
 404 }
 405
 406
 407 void GuiWorkArea::processKeySym(KeySymbol const & key, KeyModifier mod)
 408 {
 409         // In order to avoid bad surprise in the middle of an operation,
 410         // we better stop the blinking cursor...
 411         // the cursor gets restarted in GuiView::restartCursor()
 412         stopBlinkingCursor();
 413
 414         theLyXFunc().setLyXView(lyx_view_);
 415         theLyXFunc().processKeySym(key, mod);
 416 }
 417
 418
 419 void GuiWorkArea::dispatch(FuncRequest const & cmd0, KeyModifier mod)
 420 {
 421         // Handle drag&drop
 422         if (cmd0.action == LFUN_FILE_OPEN) {
 423                 lyx_view_->dispatch(cmd0);
 424                 return;
 425         }
 426
 427         theLyXFunc().setLyXView(lyx_view_);
 428
 429         FuncRequest cmd;
 430
 431         if (cmd0.action == LFUN_MOUSE_PRESS) {
 432                 if (mod == ShiftModifier)
 433                         cmd = FuncRequest(cmd0, "region-select");
 434                 else if (mod == ControlModifier)
 435                         cmd = FuncRequest(cmd0, "paragraph-select");
 436                 else
 437                         cmd = cmd0;
 438         }
 439         else
 440                 cmd = cmd0;
 441
 442         bool const notJustMovingTheMouse =
 443                 cmd.action != LFUN_MOUSE_MOTION || cmd.button() != mouse_button::none;
 444
 445         // In order to avoid bad surprise in the middle of an operation, we better stop
 446         // the blinking cursor.
 447         if (notJustMovingTheMouse)
 448                 stopBlinkingCursor();
 449
 450         buffer_view_->mouseEventDispatch(cmd);
 451
 452         // Skip these when selecting
 453         if (cmd.action != LFUN_MOUSE_MOTION) {
 454                 completer_->updateVisibility(false, false);
 455                 lyx_view_->updateLayoutList();
 456                 lyx_view_->updateToolbars();
 457         }
 458
 459         // GUI tweaks except with mouse motion with no button pressed.
 460         if (notJustMovingTheMouse) {
 461                 // Slight hack: this is only called currently when we
 462                 // clicked somewhere, so we force through the display
 463                 // of the new status here.
 464                 lyx_view_->clearMessage();
 465
 466                 // Show the cursor immediately after any operation
 467                 startBlinkingCursor();
 468         }
 469 }
 470
 471
 472 void GuiWorkArea::resizeBufferView()
 473 {
 474         // WARNING: Please don't put any code that will trigger a repaint here!
 475         // We are already inside a paint event.
 476         lyx_view_->setBusy(true);
 477         buffer_view_->resize(viewport()->width(), viewport()->height());
 478         updateScreen();
 479
 480         // Update scrollbars which might have changed due different
 481         // BufferView dimension. This is especially important when the
 482         // BufferView goes from zero-size to the real-size for the first time,
 483         // as the scrollbar paramters are then set for the first time.
 484         updateScrollbar();
 485
 486         lyx_view_->updateLayoutList();
 487         lyx_view_->setBusy(false);
 488         need_resize_ = false;
 489 }
 490
 491
 492 void GuiWorkArea::showCursor()
 493 {
 494         if (cursor_visible_)
 495                 return;
 496
 497         // RTL or not RTL
 498         bool l_shape = false;
 499         Font const & realfont = buffer_view_->cursor().real_current_font;
 500         BufferParams const & bp = buffer_view_->buffer().params();
 501         bool const samelang = realfont.language() == bp.language;
 502         bool const isrtl = realfont.isVisibleRightToLeft();
 503
 504         if (!samelang || isrtl != bp.language->rightToLeft())
 505                 l_shape = true;
 506
 507         // The ERT language hack needs fixing up
 508         if (realfont.language() == latex_language)
 509                 l_shape = false;
 510
 511         Font const font = buffer_view_->cursor().getFont();
 512         FontMetrics const & fm = theFontMetrics(font);
 513         int const asc = fm.maxAscent();
 514         int const des = fm.maxDescent();
 515         int h = asc + des;
 516         int x = 0;
 517         int y = 0;
 518         Cursor & cur = buffer_view_->cursor();
 519         cur.getPos(x, y);
 520         y -= asc;
 521
 522         // if it doesn't touch the screen, don't try to show it
 523         bool cursorInView = true;
 524         if (y + h < 0 || y >= viewport()->height())
 525                 cursorInView = false;
 526
 527         // show cursor on screen
 528         bool completable = cur.inset().showCompletionCursor()
 529                 && completer_->completionAvailable()
 530                 && !completer_->popupVisible()
 531                 && !completer_->inlineVisible();
 532         if (cursorInView) {
 533                 cursor_visible_ = true;
 534                 showCursor(x, y, h, l_shape, isrtl, completable);
 535         }
 536 }
 537
 538
 539 void GuiWorkArea::hideCursor()
 540 {
 541         if (!cursor_visible_)
 542                 return;
 543
 544         cursor_visible_ = false;
 545         removeCursor();
 546 }
 547
 548
 549 void GuiWorkArea::toggleCursor()
 550 {
 551         if (cursor_visible_)
 552                 hideCursor();
 553         else
 554                 showCursor();
 555 }
 556
 557
 558 void GuiWorkArea::updateScrollbar()
 559 {
 560         ScrollbarParameters const & scroll_ = buffer_view_->scrollbarParameters();
 561
 562         // Block the scrollbar signal to prevent recursive signal/slot calling.
 563         verticalScrollBar()->blockSignals(true);
 564         verticalScrollBar()->setRange(scroll_.min, scroll_.max);
 565         verticalScrollBar()->setPageStep(scroll_.page_step);
 566         verticalScrollBar()->setSingleStep(scroll_.single_step);
 567         verticalScrollBar()->setValue(scroll_.position);
 568         verticalScrollBar()->setSliderPosition(scroll_.position);
 569         verticalScrollBar()->blockSignals(false);
 570 }
 571
 572
 573 void GuiWorkArea::scrollTo(int value)
 574 {
 575         stopBlinkingCursor();
 576         buffer_view_->scrollDocView(value);
 577
 578         if (lyxrc.cursor_follows_scrollbar) {
 579                 buffer_view_->setCursorFromScrollbar();
 580                 lyx_view_->updateLayoutList();
 581         }
 582         // Show the cursor immediately after any operation.
 583         startBlinkingCursor();
 584         QApplication::syncX();
 585 }
 586
 587
 588 bool GuiWorkArea::event(QEvent * e)
 589 {
 590         switch (e->type()) {
 591         case QEvent::ToolTip: {
 592                 QHelpEvent * helpEvent = static_cast<QHelpEvent *>(e);
 593                 if (lyxrc.use_tooltip) {
 594                         QPoint pos = helpEvent->pos();
 595                         if (pos.x() < viewport()->width()) {
 596                                 QString s = toqstr(buffer_view_->toolTip(pos.x(), pos.y()));
 597                                 QToolTip::showText(helpEvent->globalPos(), s);
 598                         }
 599                         else
 600                                 QToolTip::hideText();
 601                 }
 602                 // Don't forget to accept the event!
 603                 e->accept();
 604                 return true;
 605         }
 606
 607         case QEvent::ShortcutOverride: {
 608                 // We catch this event in order to catch the Tab or Shift+Tab key press
 609                 // which are otherwise reserved to focus switching between controls
 610                 // within a dialog.
 611                 QKeyEvent * ke = static_cast<QKeyEvent*>(e);
 612                 if ((ke->key() != Qt::Key_Tab && ke->key() != Qt::Key_Backtab)
 613                         || ke->modifiers() & Qt::ControlModifier)
 614                         return QAbstractScrollArea::event(e);
 615                 keyPressEvent(ke);
 616                 return true;
 617         }
 618
 619         default:
 620                 return QAbstractScrollArea::event(e);
 621         }
 622         return false;
 623 }
 624
 625
 626 void GuiWorkArea::contextMenuEvent(QContextMenuEvent * e)
 627 {
 628         QPoint pos = e->pos();
 629         docstring name = buffer_view_->contextMenu(pos.x(), pos.y());
 630         if (name.empty()) {
 631                 QAbstractScrollArea::contextMenuEvent(e);
 632                 return;
 633         }
 634         QMenu * menu = guiApp->menus().menu(toqstr(name), *lyx_view_);
 635         if (!menu) {
 636                 QAbstractScrollArea::contextMenuEvent(e);
 637                 return;
 638         }
 639         // Position the menu to the right.
 640         // FIXME: menu position should be different for RTL text.
 641         menu->exec(e->globalPos());
 642         e->accept();
 643 }
 644
 645
 646 void GuiWorkArea::focusInEvent(QFocusEvent * e)
 647 {
 648         if (lyx_view_->currentWorkArea() != this)
 649                 lyx_view_->setCurrentWorkArea(this);
 650
 651         // Repaint the whole screen.
 652         // Note: this is different from redraw() as only the backing pixmap
 653         // will be redrawn, which is cheap.
 654         viewport()->repaint();
 655
 656         startBlinkingCursor();
 657         QAbstractScrollArea::focusInEvent(e);
 658 }
 659
 660
 661 void GuiWorkArea::focusOutEvent(QFocusEvent * e)
 662 {
 663         stopBlinkingCursor();
 664         QAbstractScrollArea::focusOutEvent(e);
 665 }
 666
 667
 668 void GuiWorkArea::mousePressEvent(QMouseEvent * e)
 669 {
 670         if (dc_event_.active && dc_event_ == *e) {
 671                 dc_event_.active = false;
 672                 FuncRequest cmd(LFUN_MOUSE_TRIPLE, e->x(), e->y(),
 673                         q_button_state(e->button()));
 674                 dispatch(cmd);
 675                 e->accept();
 676                 return;
 677         }
 678
 679         inputContext()->reset();
 680
 681         FuncRequest const cmd(LFUN_MOUSE_PRESS, e->x(), e->y(),
 682                 q_button_state(e->button()));
 683         dispatch(cmd, q_key_state(e->modifiers()));
 684         e->accept();
 685 }
 686
 687
 688 void GuiWorkArea::mouseReleaseEvent(QMouseEvent * e)
 689 {
 690         if (synthetic_mouse_event_.timeout.running())
 691                 synthetic_mouse_event_.timeout.stop();
 692
 693         FuncRequest const cmd(LFUN_MOUSE_RELEASE, e->x(), e->y(),
 694                               q_button_state(e->button()));
 695         dispatch(cmd);
 696         e->accept();
 697 }
 698
 699
 700 void GuiWorkArea::mouseMoveEvent(QMouseEvent * e)
 701 {
 702         // we kill the triple click if we move
 703         doubleClickTimeout();
 704         FuncRequest cmd(LFUN_MOUSE_MOTION, e->x(), e->y(),
 705                 q_motion_state(e->buttons()));
 706
 707         e->accept();
 708
 709         // If we're above or below the work area...
 710         if (e->y() <= 20 || e->y() >= viewport()->height() - 20) {
 711                 // Make sure only a synthetic event can cause a page scroll,
 712                 // so they come at a steady rate:
 713                 if (e->y() <= 20)
 714                         // _Force_ a scroll up:
 715                         cmd.y = -40;
 716                 else
 717                         cmd.y = viewport()->height();
 718                 // Store the event, to be handled when the timeout expires.
 719                 synthetic_mouse_event_.cmd = cmd;
 720
 721                 if (synthetic_mouse_event_.timeout.running())
 722                         // Discard the event. Note that it _may_ be handled
 723                         // when the timeout expires if
 724                         // synthetic_mouse_event_.cmd has not been overwritten.
 725                         // Ie, when the timeout expires, we handle the
 726                         // most recent event but discard all others that
 727                         // occurred after the one used to start the timeout
 728                         // in the first place.
 729                         return;
 730
 731                 synthetic_mouse_event_.restart_timeout = true;
 732                 synthetic_mouse_event_.timeout.start();
 733                 // Fall through to handle this event...
 734
 735         } else if (synthetic_mouse_event_.timeout.running()) {
 736                 // Store the event, to be possibly handled when the timeout
 737                 // expires.
 738                 // Once the timeout has expired, normal control is returned
 739                 // to mouseMoveEvent (restart_timeout = false).
 740                 // This results in a much smoother 'feel' when moving the
 741                 // mouse back into the work area.
 742                 synthetic_mouse_event_.cmd = cmd;
 743                 synthetic_mouse_event_.restart_timeout = false;
 744                 return;
 745         }
 746
 747         // Has anything changed on-screen since the last QMouseEvent
 748         // was received?
 749         double const scrollbar_value = verticalScrollBar()->value();
 750         if (e->x() == synthetic_mouse_event_.x_old
 751                 && e->y() == synthetic_mouse_event_.y_old
 752                 && scrollbar_value == synthetic_mouse_event_.scrollbar_value_old) {
 753                 // Nothing changed on-screen since the last QMouseEvent.
 754                 return;
 755         }
 756
 757         // Yes something has changed. Store the params used to check this.
 758         synthetic_mouse_event_.x_old = e->x();
 759         synthetic_mouse_event_.y_old = e->y();
 760         synthetic_mouse_event_.scrollbar_value_old = scrollbar_value;
 761
 762         // ... and dispatch the event to the LyX core.
 763         dispatch(cmd);
 764 }
 765
 766
 767 void GuiWorkArea::wheelEvent(QWheelEvent * ev)
 768 {
 769         // Wheel rotation by one notch results in a delta() of 120 (see
 770         // documentation of QWheelEvent)
 771         int delta = ev->delta() / 120;
 772         if (ev->modifiers() & Qt::ControlModifier) {
 773                 lyxrc.zoom -= 5 * delta;
 774                 if (lyxrc.zoom < 10)
 775                         lyxrc.zoom = 10;
 776                 // The global QPixmapCache is used in GuiPainter to cache text
 777                 // painting so we must reset it.
 778                 QPixmapCache::clear();
 779                 guiApp->fontLoader().update();
 780                 lyx::dispatch(FuncRequest(LFUN_SCREEN_FONT_UPDATE));
 781         } else {
 782                 double const lines = qApp->wheelScrollLines()
 783                         * lyxrc.mouse_wheel_speed * delta;
 784                 LYXERR(Debug::SCROLLING, "wheelScrollLines = " << qApp->wheelScrollLines()
 785                         << " delta = " << ev->delta() << " lines = " << lines);
 786                 verticalScrollBar()->setValue(verticalScrollBar()->value() -
 787                         int(lines *  verticalScrollBar()->singleStep()));
 788         }
 789         ev->accept();
 790 }
 791
 792
 793 void GuiWorkArea::generateSyntheticMouseEvent()
 794 {
 795         // Set things off to generate the _next_ 'pseudo' event.
 796         if (synthetic_mouse_event_.restart_timeout)
 797                 synthetic_mouse_event_.timeout.start();
 798
 799         // Has anything changed on-screen since the last timeout signal
 800         // was received?
 801         double const scrollbar_value = verticalScrollBar()->value();
 802         if (scrollbar_value != synthetic_mouse_event_.scrollbar_value_old) {
 803                 // Yes it has. Store the params used to check this.
 804                 synthetic_mouse_event_.scrollbar_value_old = scrollbar_value;
 805
 806                 // ... and dispatch the event to the LyX core.
 807                 dispatch(synthetic_mouse_event_.cmd);
 808         }
 809 }
 810
 811
 812 void GuiWorkArea::keyPressEvent(QKeyEvent * ev)
 813 {
 814         // intercept some keys if completion popup is visible
 815         if (completer_->popupVisible()) {
 816                 switch (ev->key()) {
 817                 case Qt::Key_Enter:
 818                 case Qt::Key_Return:
 819                         completer_->activate();
 820                         ev->accept();
 821                         return;
 822                 }
 823         }
 824
 825         // intercept keys for the completion
 826         if (ev->key() == Qt::Key_Tab) {
 827                 completer_->tab();
 828                 ev->accept();
 829                 return;
 830         }
 831
 832         if (completer_->popupVisible() && ev->key() == Qt::Key_Escape) {
 833                 completer_->hidePopup();
 834                 ev->accept();
 835                 return;
 836         }
 837
 838         if (completer_->inlineVisible() && ev->key() == Qt::Key_Escape) {
 839                 completer_->hideInline();
 840                 ev->accept();
 841                 return;
 842         }
 843
 844         // do nothing if there are other events
 845         // (the auto repeated events come too fast)
 846         // \todo FIXME: remove hard coded Qt keys, process the key binding
 847 #ifdef Q_WS_X11
 848         if (XEventsQueued(QX11Info::display(), 0) > 1 && ev->isAutoRepeat()
 849                         && (Qt::Key_PageDown || Qt::Key_PageUp)) {
 850                 LYXERR(Debug::KEY, "system is busy: scroll key event ignored");
 851                 ev->ignore();
 852                 return;
 853         }
 854 #endif
 855
 856         LYXERR(Debug::KEY, " count: " << ev->count() << " text: " << ev->text()
 857                 << " isAutoRepeat: " << ev->isAutoRepeat() << " key: " << ev->key());
 858
 859         KeySymbol sym;
 860         setKeySymbol(&sym, ev);
 861         processKeySym(sym, q_key_state(ev->modifiers()));
 862         ev->accept();
 863 }
 864
 865
 866 void GuiWorkArea::doubleClickTimeout()
 867 {
 868         dc_event_.active = false;
 869 }
 870
 871
 872 void GuiWorkArea::mouseDoubleClickEvent(QMouseEvent * ev)
 873 {
 874         dc_event_ = DoubleClick(ev);
 875         QTimer::singleShot(QApplication::doubleClickInterval(), this,
 876                            SLOT(doubleClickTimeout()));
 877         FuncRequest cmd(LFUN_MOUSE_DOUBLE,
 878                         ev->x(), ev->y(),
 879                         q_button_state(ev->button()));
 880         dispatch(cmd);
 881         ev->accept();
 882 }
 883
 884
 885 void GuiWorkArea::resizeEvent(QResizeEvent * ev)
 886 {
 887         QAbstractScrollArea::resizeEvent(ev);
 888         need_resize_ = true;
 889         ev->accept();
 890 }
 891
 892
 893 void GuiWorkArea::update(int x, int y, int w, int h)
 894 {
 895         viewport()->repaint(x, y, w, h);
 896 }
 897
 898
 899 void GuiWorkArea::paintEvent(QPaintEvent * ev)
 900 {
 901         QRect const rc = ev->rect();
 902         // LYXERR(Debug::PAINTING, "paintEvent begin: x: " << rc.x()
 903         //      << " y: " << rc.y() << " w: " << rc.width() << " h: " << rc.height());
 904
 905         if (need_resize_) {
 906                 screen_ = QPixmap(viewport()->width(), viewport()->height());
 907                 resizeBufferView();
 908                 hideCursor();
 909                 showCursor();
 910         }
 911
 912         QPainter pain(viewport());
 913         pain.drawPixmap(rc, screen_, rc);
 914         cursor_->draw(pain);
 915         ev->accept();
 916 }
 917
 918
 919 void GuiWorkArea::updateScreen()
 920 {
 921         GuiPainter pain(&screen_);
 922         buffer_view_->draw(pain);
 923 }
 924
 925
 926 void GuiWorkArea::showCursor(int x, int y, int h,
 927         bool l_shape, bool rtl, bool completable)
 928 {
 929         if (schedule_redraw_) {
 930                 buffer_view_->updateMetrics();
 931                 updateScreen();
 932                 viewport()->update(QRect(0, 0, viewport()->width(), viewport()->height()));
 933                 schedule_redraw_ = false;
 934                 // Show the cursor immediately after the update.
 935                 hideCursor();
 936                 toggleCursor();
 937                 return;
 938         }
 939
 940         cursor_->update(x, y, h, l_shape, rtl, completable);
 941         cursor_->show();
 942         viewport()->update(cursor_->rect());
 943 }
 944
 945
 946 void GuiWorkArea::removeCursor()
 947 {
 948         cursor_->hide();
 949         //if (!qApp->focusWidget())
 950                 viewport()->update(cursor_->rect());
 951 }
 952
 953
 954 void GuiWorkArea::inputMethodEvent(QInputMethodEvent * e)
 955 {
 956         QString const & commit_string = e->commitString();
 957         docstring const & preedit_string
 958                 = qstring_to_ucs4(e->preeditString());
 959
 960         if (!commit_string.isEmpty()) {
 961
 962                 LYXERR(Debug::KEY, "preeditString: " << e->preeditString()
 963                         << " commitString: " << e->commitString());
 964
 965                 int key = 0;
 966
 967                 // FIXME Iwami 04/01/07: we should take care also of UTF16 surrogates here.
 968                 for (int i = 0; i != commit_string.size(); ++i) {
 969                         QKeyEvent ev(QEvent::KeyPress, key, Qt::NoModifier, commit_string[i]);
 970                         keyPressEvent(&ev);
 971                 }
 972         }
 973
 974         // Hide the cursor during the kana-kanji transformation.
 975         if (preedit_string.empty())
 976                 startBlinkingCursor();
 977         else
 978                 stopBlinkingCursor();
 979
 980         // last_width : for checking if last preedit string was/wasn't empty.
 981         static bool last_width = false;
 982         if (!last_width && preedit_string.empty()) {
 983                 // if last_width is last length of preedit string.
 984                 e->accept();
 985                 return;
 986         }
 987
 988         GuiPainter pain(&screen_);
 989         buffer_view_->updateMetrics();
 990         buffer_view_->draw(pain);
 991         FontInfo font = buffer_view_->cursor().getFont().fontInfo();
 992         FontMetrics const & fm = theFontMetrics(font);
 993         int height = fm.maxHeight();
 994         int cur_x = cursor_->rect().left();
 995         int cur_y = cursor_->rect().bottom();
 996
 997         // redraw area of preedit string.
 998         update(0, cur_y - height, viewport()->width(),
 999                 (height + 1) * preedit_lines_);
1000
1001         if (preedit_string.empty()) {
1002                 last_width = false;
1003                 preedit_lines_ = 1;
1004                 e->accept();
1005                 return;
1006         }
1007         last_width = true;
1008
1009         // att : stores an IM attribute.
1010         QList<QInputMethodEvent::Attribute> const & att = e->attributes();
1011
1012         // get attributes of input method cursor.
1013         // cursor_pos : cursor position in preedit string.
1014         size_t cursor_pos = 0;
1015         bool cursor_is_visible = false;
1016         for (int i = 0; i != att.size(); ++i) {
1017                 if (att.at(i).type == QInputMethodEvent::Cursor) {
1018                         cursor_pos = att.at(i).start;
1019                         cursor_is_visible = att.at(i).length != 0;
1020                         break;
1021                 }
1022         }
1023
1024         size_t preedit_length = preedit_string.length();
1025
1026         // get position of selection in input method.
1027         // FIXME: isn't there a way to do this simplier?
1028         // rStart : cursor position in selected string in IM.
1029         size_t rStart = 0;
1030         // rLength : selected string length in IM.
1031         size_t rLength = 0;
1032         if (cursor_pos < preedit_length) {
1033                 for (int i = 0; i != att.size(); ++i) {
1034                         if (att.at(i).type == QInputMethodEvent::TextFormat) {
1035                                 if (att.at(i).start <= int(cursor_pos)
1036                                         && int(cursor_pos) < att.at(i).start + att.at(i).length) {
1037                                                 rStart = att.at(i).start;
1038                                                 rLength = att.at(i).length;
1039                                                 if (!cursor_is_visible)
1040                                                         cursor_pos += rLength;
1041                                                 break;
1042                                 }
1043                         }
1044                 }
1045         }
1046         else {
1047                 rStart = cursor_pos;
1048                 rLength = 0;
1049         }
1050
1051         int const right_margin = buffer_view_->rightMargin();
1052         Painter::preedit_style ps;
1053         // Most often there would be only one line:
1054         preedit_lines_ = 1;
1055         for (size_t pos = 0; pos != preedit_length; ++pos) {
1056                 char_type const typed_char = preedit_string[pos];
1057                 // reset preedit string style
1058                 ps = Painter::preedit_default;
1059
1060                 // if we reached the right extremity of the screen, go to next line.
1061                 if (cur_x + fm.width(typed_char) > viewport()->width() - right_margin) {
1062                         cur_x = right_margin;
1063                         cur_y += height + 1;
1064                         ++preedit_lines_;
1065                 }
1066                 // preedit strings are displayed with dashed underline
1067                 // and partial strings are displayed white on black indicating
1068                 // that we are in selecting mode in the input method.
1069                 // FIXME: rLength == preedit_length is not a changing condition
1070                 // FIXME: should be put out of the loop.
1071                 if (pos >= rStart
1072                         && pos < rStart + rLength
1073                         && !(cursor_pos < rLength && rLength == preedit_length))
1074                         ps = Painter::preedit_selecting;
1075
1076                 if (pos == cursor_pos
1077                         && (cursor_pos < rLength && rLength == preedit_length))
1078                         ps = Painter::preedit_cursor;
1079
1080                 // draw one character and update cur_x.
1081                 cur_x += pain.preeditText(cur_x, cur_y, typed_char, font, ps);
1082         }
1083
1084         // update the preedit string screen area.
1085         update(0, cur_y - preedit_lines_*height, viewport()->width(),
1086                 (height + 1) * preedit_lines_);
1087
1088         // Don't forget to accept the event!
1089         e->accept();
1090 }
1091
1092
1093 QVariant GuiWorkArea::inputMethodQuery(Qt::InputMethodQuery query) const
1094 {
1095         QRect cur_r(0,0,0,0);
1096         switch (query) {
1097                 // this is the CJK-specific composition window position.
1098                 case Qt::ImMicroFocus:
1099                         cur_r = cursor_->rect();
1100                         if (preedit_lines_ != 1)
1101                                 cur_r.moveLeft(10);
1102                         cur_r.moveBottom(cur_r.bottom() + cur_r.height() * preedit_lines_);
1103                         // return lower right of cursor in LyX.
1104                         return cur_r;
1105                 default:
1106                         return QWidget::inputMethodQuery(query);
1107         }
1108 }
1109
1110
1111 void GuiWorkArea::updateWindowTitle()
1112 {
1113         docstring maximize_title;
1114         docstring minimize_title;
1115
1116         Buffer & buf = buffer_view_->buffer();
1117         FileName const fileName = buf.fileName();
1118         if (!fileName.empty()) {
1119                 maximize_title = fileName.displayName(30);
1120                 minimize_title = from_utf8(fileName.onlyFileName());
1121                 if (!buf.isClean()) {
1122                         maximize_title += _(" (changed)");
1123                         minimize_title += char_type('*');
1124                 }
1125                 if (buf.isReadonly())
1126                         maximize_title += _(" (read only)");
1127         }
1128
1129         QString title = windowTitle();
1130         QString new_title = toqstr(maximize_title);
1131         if (title == new_title)
1132                 return;
1133
1134         QWidget::setWindowTitle(new_title);
1135         QWidget::setWindowIconText(toqstr(minimize_title));
1136         titleChanged(this);
1137 }
1138
1139
1140 void GuiWorkArea::setReadOnly(bool)
1141 {
1142         updateWindowTitle();
1143         if (this == lyx_view_->currentWorkArea())
1144                 lyx_view_->updateBufferDependent(false);
1145 }
1146
1147
1148 bool GuiWorkArea::isFullScreen()
1149 {
1150         return lyx_view_ && lyx_view_->isFullScreen();
1151 }
1152
1153
1154 ////////////////////////////////////////////////////////////////////
1155 //
1156 // TabWorkArea
1157 //
1158 ////////////////////////////////////////////////////////////////////
1159
1160 #ifdef Q_WS_MACX
1161 class NoTabFrameMacStyle : public QMacStyle {
1162 public:
1163         ///
1164         QRect subElementRect(SubElement element, const QStyleOption * option,
1165                              const QWidget * widget = 0) const
1166         {
1167                 QRect rect = QMacStyle::subElementRect(element, option, widget);
1168                 bool noBar = static_cast<QTabWidget const *>(widget)->count() <= 1;
1169
1170                 // The Qt Mac style puts the contents into a 3 pixel wide box
1171                 // which looks very ugly and not like other Mac applications.
1172                 // Hence we remove this here, and moreover the 16 pixel round
1173                 // frame above if the tab bar is hidden.
1174                 if (element == QStyle::SE_TabWidgetTabContents) {
1175                         rect.adjust(- rect.left(), 0, rect.left(), 0);
1176                         if (noBar)
1177                                 rect.setTop(0);
1178                 }
1179
1180                 return rect;
1181         }
1182 };
1183
1184 NoTabFrameMacStyle noTabFrameMacStyle;
1185 #endif
1186
1187
1188 TabWorkArea::TabWorkArea(QWidget * parent)
1189         : QTabWidget(parent), clicked_tab_(-1)
1190 {
1191 #ifdef Q_WS_MACX
1192         setStyle(&noTabFrameMacStyle);
1193 #endif
1194
1195         QPalette pal = palette();
1196         pal.setColor(QPalette::Active, QPalette::Button,
1197                 pal.color(QPalette::Active, QPalette::Window));
1198         pal.setColor(QPalette::Disabled, QPalette::Button,
1199                 pal.color(QPalette::Disabled, QPalette::Window));
1200         pal.setColor(QPalette::Inactive, QPalette::Button,
1201                 pal.color(QPalette::Inactive, QPalette::Window));
1202
1203         QObject::connect(this, SIGNAL(currentChanged(int)),
1204                 this, SLOT(on_currentTabChanged(int)));
1205
1206         QToolButton * closeBufferButton = new QToolButton(this);
1207         closeBufferButton->setPalette(pal);
1208         // FIXME: rename the icon to closebuffer.png
1209         closeBufferButton->setIcon(QIcon(":/images/closetab.png"));
1210         closeBufferButton->setText("Close File");
1211         closeBufferButton->setAutoRaise(true);
1212         closeBufferButton->setCursor(Qt::ArrowCursor);
1213         closeBufferButton->setToolTip(qt_("Close File"));
1214         closeBufferButton->setEnabled(true);
1215         QObject::connect(closeBufferButton, SIGNAL(clicked()),
1216                 this, SLOT(closeCurrentBuffer()));
1217         setCornerWidget(closeBufferButton, Qt::TopRightCorner);
1218
1219         // setup drag'n'drop
1220         QTabBar* tb = new DragTabBar;
1221         connect(tb, SIGNAL(tabMoveRequested(int, int)),
1222                 this, SLOT(moveTab(int, int)));
1223         setTabBar(tb);
1224
1225         // make us responsible for the context menu of the tabbar
1226         tb->setContextMenuPolicy(Qt::CustomContextMenu);
1227         connect(tb, SIGNAL(customContextMenuRequested(const QPoint &)),
1228                 this, SLOT(showContextMenu(const QPoint &)));
1229
1230         setUsesScrollButtons(true);
1231 }
1232
1233
1234 void TabWorkArea::setFullScreen(bool full_screen)
1235 {
1236         for (int i = 0; i != count(); ++i) {
1237                 if (GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i)))
1238                         wa->setFullScreen(full_screen);
1239         }
1240
1241         if (lyxrc.full_screen_tabbar)
1242                 showBar(!full_screen && count()>1);
1243 }
1244
1245
1246 void TabWorkArea::showBar(bool show)
1247 {
1248         tabBar()->setEnabled(show);
1249         tabBar()->setVisible(show);
1250 }
1251
1252
1253 GuiWorkArea * TabWorkArea::currentWorkArea()
1254 {
1255         if (count() == 0)
1256                 return 0;
1257
1258         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(currentWidget());
1259         LASSERT(wa, /**/);
1260         return wa;
1261 }
1262
1263
1264 GuiWorkArea * TabWorkArea::workArea(Buffer & buffer)
1265 {
1266         for (int i = 0; i != count(); ++i) {
1267                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i));
1268                 LASSERT(wa, return 0);
1269                 if (&wa->bufferView().buffer() == &buffer)
1270                         return wa;
1271         }
1272         return 0;
1273 }
1274
1275
1276 void TabWorkArea::closeAll()
1277 {
1278         while (count()) {
1279                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(0));
1280                 LASSERT(wa, /**/);
1281                 removeTab(0);
1282                 delete wa;
1283         }
1284 }
1285
1286
1287 bool TabWorkArea::setCurrentWorkArea(GuiWorkArea * work_area)
1288 {
1289         LASSERT(work_area, /**/);
1290         int index = indexOf(work_area);
1291         if (index == -1)
1292                 return false;
1293
1294         if (index == currentIndex())
1295                 // Make sure the work area is up to date.
1296                 on_currentTabChanged(index);
1297         else
1298                 // Switch to the work area.
1299                 setCurrentIndex(index);
1300         work_area->setFocus();
1301
1302         return true;
1303 }
1304
1305
1306 GuiWorkArea * TabWorkArea::addWorkArea(Buffer & buffer, GuiView & view)
1307 {
1308         GuiWorkArea * wa = new GuiWorkArea(buffer, view);
1309         wa->setUpdatesEnabled(false);
1310         // Hide tabbar if there's no tab (avoid a resize and a flashing tabbar
1311         // when hiding it again below).
1312         if (!(currentWorkArea() && currentWorkArea()->isFullScreen()))
1313                 showBar(count() > 0);
1314         addTab(wa, wa->windowTitle());
1315         QObject::connect(wa, SIGNAL(titleChanged(GuiWorkArea *)),
1316                 this, SLOT(updateTabText(GuiWorkArea *)));
1317         if (currentWorkArea() && currentWorkArea()->isFullScreen())
1318                 setFullScreen(true);
1319         else
1320                 // Hide tabbar if there's only one tab.
1321                 showBar(count() > 1);
1322
1323         return wa;
1324 }
1325
1326
1327 bool TabWorkArea::removeWorkArea(GuiWorkArea * work_area)
1328 {
1329         LASSERT(work_area, return false);
1330         int index = indexOf(work_area);
1331         if (index == -1)
1332                 return false;
1333
1334         work_area->setUpdatesEnabled(false);
1335         removeTab(index);
1336         delete work_area;
1337
1338         if (count()) {
1339                 // make sure the next work area is enabled.
1340                 currentWidget()->setUpdatesEnabled(true);
1341                 if (currentWorkArea() && currentWorkArea()->isFullScreen())
1342                         setFullScreen(true);
1343                 else
1344                         // Hide tabbar if there's only one tab.
1345                         showBar(count() > 1);
1346         } else {
1347                 lastWorkAreaRemoved();
1348         }
1349
1350         return true;
1351 }
1352
1353
1354 void TabWorkArea::on_currentTabChanged(int i)
1355 {
1356         // returns e.g. on application destruction
1357         if (i == -1)
1358                 return;
1359         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i));
1360         LASSERT(wa, return);
1361         BufferView & bv = wa->bufferView();
1362         bv.cursor().fixIfBroken();
1363         bv.updateMetrics();
1364         wa->setUpdatesEnabled(true);
1365         wa->redraw();
1366         wa->setFocus();
1367         ///
1368         currentWorkAreaChanged(wa);
1369
1370         LYXERR(Debug::GUI, "currentTabChanged " << i
1371                 << "File" << bv.buffer().absFileName());
1372 }
1373
1374
1375 void TabWorkArea::closeCurrentBuffer()
1376 {
1377         if (clicked_tab_ != -1)
1378                 setCurrentIndex(clicked_tab_);
1379
1380         lyx::dispatch(FuncRequest(LFUN_BUFFER_CLOSE));
1381 }
1382
1383
1384 void TabWorkArea::closeCurrentTab()
1385 {
1386         if (clicked_tab_ == -1)
1387                 removeWorkArea(currentWorkArea());
1388         else {
1389                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(clicked_tab_));
1390                 LASSERT(wa, /**/);
1391                 removeWorkArea(wa);
1392         }
1393 }
1394
1395
1396 void TabWorkArea::updateTabText(GuiWorkArea * wa)
1397 {
1398         int const i = indexOf(wa);
1399         if (i < 0)
1400                 return;
1401         setTabText(i, wa->windowTitle());
1402 }
1403
1404
1405 void TabWorkArea::showContextMenu(const QPoint & pos)
1406 {
1407         // which tab?
1408         clicked_tab_ = static_cast<DragTabBar *>(tabBar())->tabAt(pos);
1409         if (clicked_tab_ != -1) {
1410                 // show tab popup
1411                 QMenu popup;
1412                 popup.addAction(QIcon(":/images/hidetab.png"),
1413                          qt_("Hide tab"), this, SLOT(closeCurrentTab()));
1414                 popup.addAction(QIcon(":/images/closetab.png"),
1415                          qt_("Close tab"), this, SLOT(closeCurrentBuffer()));
1416                 popup.exec(tabBar()->mapToGlobal(pos));
1417
1418                 clicked_tab_ = -1;
1419         }
1420 }
1421
1422
1423 void TabWorkArea::moveTab(int fromIndex, int toIndex)
1424 {
1425         QWidget * w = widget(fromIndex);
1426         QIcon icon = tabIcon(fromIndex);
1427         QString text = tabText(fromIndex);
1428
1429         setCurrentIndex(fromIndex);
1430         removeTab(fromIndex);
1431         insertTab(toIndex, w, icon, text);
1432         setCurrentIndex(toIndex);
1433 }
1434
1435
1436 DragTabBar::DragTabBar(QWidget* parent)
1437         : QTabBar(parent)
1438 {
1439         setAcceptDrops(true);
1440 }
1441
1442
1443 #if QT_VERSION < 0x040300
1444 int DragTabBar::tabAt(QPoint const & position) const
1445 {
1446         const int max = count();
1447         for (int i = 0; i < max; ++i) {
1448                 if (tabRect(i).contains(position))
1449                         return i;
1450         }
1451         return -1;
1452 }
1453 #endif
1454
1455
1456 void DragTabBar::mousePressEvent(QMouseEvent * event)
1457 {
1458         if (event->button() == Qt::LeftButton)
1459                 dragStartPos_ = event->pos();
1460         QTabBar::mousePressEvent(event);
1461 }
1462
1463
1464 void DragTabBar::mouseMoveEvent(QMouseEvent * event)
1465 {
1466         // If the left button isn't pressed anymore then return
1467         if (!(event->buttons() & Qt::LeftButton))
1468                 return;
1469
1470         // If the distance is too small then return
1471         if ((event->pos() - dragStartPos_).manhattanLength()
1472             < QApplication::startDragDistance())
1473                 return;
1474
1475         // did we hit something after all?
1476         int tab = tabAt(dragStartPos_);
1477         if (tab == -1)
1478                 return;
1479
1480         // simulate button release to remove highlight from button
1481         int i = currentIndex();
1482         QMouseEvent me(QEvent::MouseButtonRelease, dragStartPos_,
1483                 event->button(), event->buttons(), 0);
1484         QTabBar::mouseReleaseEvent(&me);
1485         setCurrentIndex(i);
1486
1487         // initiate Drag
1488         QDrag * drag = new QDrag(this);
1489         QMimeData * mimeData = new QMimeData;
1490         // a crude way to distinguish tab-reodering drops from other ones
1491         mimeData->setData("action", "tab-reordering") ;
1492         drag->setMimeData(mimeData);
1493
1494 #if QT_VERSION >= 0x040300
1495         // get tab pixmap as cursor
1496         QRect r = tabRect(tab);
1497         QPixmap pixmap(r.size());
1498         render(&pixmap, - r.topLeft());
1499         drag->setPixmap(pixmap);
1500         drag->exec();
1501 #else
1502         drag->start(Qt::MoveAction);
1503 #endif
1504
1505 }
1506
1507
1508 void DragTabBar::dragEnterEvent(QDragEnterEvent * event)
1509 {
1510         // Only accept if it's an tab-reordering request
1511         QMimeData const * m = event->mimeData();
1512         QStringList formats = m->formats();
1513         if (formats.contains("action")
1514             && m->data("action") == "tab-reordering")
1515                 event->acceptProposedAction();
1516 }
1517
1518
1519 void DragTabBar::dropEvent(QDropEvent * event)
1520 {
1521         int fromIndex = tabAt(dragStartPos_);
1522         int toIndex = tabAt(event->pos());
1523
1524         // Tell interested objects that
1525         if (fromIndex != toIndex)
1526                 tabMoveRequested(fromIndex, toIndex);
1527         event->acceptProposedAction();
1528 }
1529
1530
1531 } // namespace frontend
1532 } // namespace lyx
1533
1534 #include "GuiWorkArea_moc.cpp"