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 "GuiKeySymbol.h"
  25 #include "GuiPainter.h"
  26 #include "GuiView.h"
  27 #include "KeySymbol.h"
  28 #include "Language.h"
  29 #include "LyXFunc.h"
  30 #include "LyXRC.h"
  31 #include "MetricsInfo.h"
  32 #include "qt_helpers.h"
  33 #include "Text.h"
  34 #include "version.h"
  35
  36 #include "graphics/GraphicsImage.h"
  37 #include "graphics/GraphicsLoader.h"
  38
  39 #include "support/debug.h"
  40 #include "support/gettext.h"
  41 #include "support/FileName.h"
  42
  43 #include "frontends/Application.h"
  44 #include "frontends/FontMetrics.h"
  45 #include "frontends/WorkAreaManager.h"
  46
  47 #include <QContextMenuEvent>
  48 #include <QInputContext>
  49 #include <QHelpEvent>
  50 #ifdef Q_WS_MACX
  51 #include <QMacStyle>
  52 #endif
  53 #include <QMainWindow>
  54 #include <QMenu>
  55 #include <QPainter>
  56 #include <QPalette>
  57 #include <QPixmapCache>
  58 #include <QScrollBar>
  59 #include <QTimer>
  60 #include <QToolButton>
  61 #include <QToolTip>
  62
  63 #include <boost/bind.hpp>
  64
  65 #ifdef Q_WS_X11
  66 #include <QX11Info>
  67 extern "C" int XEventsQueued(Display *display, int mode);
  68 #endif
  69
  70 #ifdef Q_WS_WIN
  71 int const CursorWidth = 2;
  72 #else
  73 int const CursorWidth = 1;
  74 #endif
  75 int const TabIndicatorWidth = 3;
  76
  77 #undef KeyPress
  78 #undef NoModifier
  79
  80 using namespace std;
  81 using namespace lyx::support;
  82
  83 namespace lyx {
  84
  85
  86 /// return the LyX mouse button state from Qt's
  87 static mouse_button::state q_button_state(Qt::MouseButton button)
  88 {
  89         mouse_button::state b = mouse_button::none;
  90         switch (button) {
  91                 case Qt::LeftButton:
  92                         b = mouse_button::button1;
  93                         break;
  94                 case Qt::MidButton:
  95                         b = mouse_button::button2;
  96                         break;
  97                 case Qt::RightButton:
  98                         b = mouse_button::button3;
  99                         break;
 100                 default:
 101                         break;
 102         }
 103         return b;
 104 }
 105
 106
 107 /// return the LyX mouse button state from Qt's
 108 mouse_button::state q_motion_state(Qt::MouseButtons state)
 109 {
 110         mouse_button::state b = mouse_button::none;
 111         if (state & Qt::LeftButton)
 112                 b |= mouse_button::button1;
 113         if (state & Qt::MidButton)
 114                 b |= mouse_button::button2;
 115         if (state & Qt::RightButton)
 116                 b |= mouse_button::button3;
 117         return b;
 118 }
 119
 120
 121 namespace frontend {
 122
 123 class CursorWidget {
 124 public:
 125         CursorWidget() {}
 126
 127         void draw(QPainter & painter)
 128         {
 129                 if (!show_ || !rect_.isValid())
 130                         return;
 131
 132                 int y = rect_.top();
 133                 int l = x_ - rect_.left();
 134                 int r = rect_.right() - x_;
 135                 int bot = rect_.bottom();
 136
 137                 // draw vertica linel
 138                 painter.fillRect(x_, y, CursorWidth, rect_.height(), color_);
 139
 140                 // draw RTL/LTR indication
 141                 painter.setPen(color_);
 142                 if (l_shape_) {
 143                         if (rtl_)
 144                                 painter.drawLine(x_, bot, x_ - l, bot);
 145                         else
 146                                 painter.drawLine(x_, bot, x_ + CursorWidth + r, bot);
 147                 }
 148
 149                 // draw completion triangle
 150                 if (completable_) {
 151                         int m = y + rect_.height() / 2;
 152                         int d = TabIndicatorWidth - 1;
 153                         if (rtl_) {
 154                                 painter.drawLine(x_ - 1, m - d, x_ - 1 - d, m);
 155                                 painter.drawLine(x_ - 1, m + d, x_ - 1 - d, m);
 156                         } else {
 157                                 painter.drawLine(x_ + CursorWidth, m - d, x_ + CursorWidth + d, m);
 158                                 painter.drawLine(x_ + CursorWidth, m + d, x_ + CursorWidth + d, m);
 159                         }
 160                 }
 161         }
 162
 163         void update(int x, int y, int h, bool l_shape,
 164                 bool rtl, bool completable)
 165         {
 166                 color_ = guiApp->colorCache().get(Color_cursor);
 167                 l_shape_ = l_shape;
 168                 rtl_ = rtl;
 169                 completable_ = completable;
 170                 x_ = x;
 171
 172                 // extension to left and right
 173                 int l = 0;
 174                 int r = 0;
 175
 176                 // RTL/LTR indication
 177                 if (l_shape_) {
 178                         if (rtl)
 179                                 l += h / 3;
 180                         else
 181                                 r += h / 3;
 182                 }
 183
 184                 // completion triangle
 185                 if (completable_) {
 186                         if (rtl)
 187                                 l = max(l, TabIndicatorWidth);
 188                         else
 189                                 r = max(r, TabIndicatorWidth);
 190                 }
 191
 192                 // compute overall rectangle
 193                 rect_ = QRect(x - l, y, CursorWidth + r + l, h);
 194         }
 195
 196         void show(bool set_show = true) { show_ = set_show; }
 197         void hide() { show_ = false; }
 198
 199         QRect const & rect() { return rect_; }
 200
 201 private:
 202         /// cursor is in RTL or LTR text
 203         bool rtl_;
 204         /// indication for RTL or LTR
 205         bool l_shape_;
 206         /// triangle to show that a completion is available
 207         bool completable_;
 208         ///
 209         bool show_;
 210         ///
 211         QColor color_;
 212         /// rectangle, possibly with l_shape and completion triangle
 213         QRect rect_;
 214         /// x position (were the vertical line is drawn)
 215         int x_;
 216 };
 217
 218
 219 // This is a 'heartbeat' generating synthetic mouse move events when the
 220 // cursor is at the top or bottom edge of the viewport. One scroll per 0.2 s
 221 SyntheticMouseEvent::SyntheticMouseEvent()
 222         : timeout(200), restart_timeout(true),
 223           x_old(-1), y_old(-1), scrollbar_value_old(-1.0)
 224 {}
 225
 226
 227
 228 GuiWorkArea::GuiWorkArea(Buffer & buffer, GuiView & lv)
 229         : buffer_view_(new BufferView(buffer)), lyx_view_(&lv),
 230         cursor_visible_(false),
 231         need_resize_(false), schedule_redraw_(false),
 232         preedit_lines_(1), completer_(this)
 233 {
 234         buffer.workAreaManager().add(this);
 235         // Setup the signals
 236         connect(&cursor_timeout_, SIGNAL(timeout()),
 237                 this, SLOT(toggleCursor()));
 238
 239         int const time = QApplication::cursorFlashTime() / 2;
 240         if (time > 0) {
 241                 cursor_timeout_.setInterval(time);
 242                 cursor_timeout_.start();
 243         } else {
 244                 // let's initialize this just to be safe
 245                 cursor_timeout_.setInterval(500);
 246         }
 247
 248         screen_ = QPixmap(viewport()->width(), viewport()->height());
 249         cursor_ = new frontend::CursorWidget();
 250         cursor_->hide();
 251
 252         // HACK: Prevents an additional redraw when the scrollbar pops up
 253         // which regularily happens on documents with more than one page.
 254         // The policy  should be set to "Qt::ScrollBarAsNeeded" soon.
 255         // Since we have no geometry information yet, we assume that
 256         // a document needs a scrollbar if there is more then four
 257         // paragraph in the outermost text.
 258         if (buffer.text().paragraphs().size() > 4)
 259                 setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
 260         QTimer::singleShot(50, this, SLOT(fixVerticalScrollBar()));
 261
 262
 263         setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 264         setAcceptDrops(true);
 265         setMouseTracking(true);
 266         setMinimumSize(100, 70);
 267 #ifdef Q_WS_MACX
 268         setFrameStyle(QFrame::NoFrame);
 269 #else
 270         setFrameStyle(QFrame::Box);
 271 #endif
 272         updateWindowTitle();
 273
 274         viewport()->setAutoFillBackground(false);
 275         // We don't need double-buffering nor SystemBackground on
 276         // the viewport because we have our own backing pixmap.
 277         viewport()->setAttribute(Qt::WA_NoSystemBackground);
 278
 279         setFocusPolicy(Qt::WheelFocus);
 280
 281         viewport()->setCursor(Qt::IBeamCursor);
 282
 283         synthetic_mouse_event_.timeout.timeout.connect(
 284                 boost::bind(&GuiWorkArea::generateSyntheticMouseEvent,
 285                                         this));
 286
 287         // Initialize the vertical Scroll Bar
 288         QObject::connect(verticalScrollBar(), SIGNAL(valueChanged(int)),
 289                 this, SLOT(scrollTo(int)));
 290
 291         LYXERR(Debug::GUI, "viewport width: " << viewport()->width()
 292                 << "  viewport height: " << viewport()->height());
 293
 294         // Enables input methods for asian languages.
 295         // Must be set when creating custom text editing widgets.
 296         setAttribute(Qt::WA_InputMethodEnabled, true);
 297 }
 298
 299
 300 GuiWorkArea::~GuiWorkArea()
 301 {
 302         buffer_view_->buffer().workAreaManager().remove(this);
 303         delete buffer_view_;
 304         delete cursor_;
 305 }
 306
 307
 308 void GuiWorkArea::fixVerticalScrollBar()
 309 {
 310         if (!isFullScreen())
 311                 setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
 312 }
 313
 314
 315 void GuiWorkArea::close()
 316 {
 317         lyx_view_->removeWorkArea(this);
 318 }
 319
 320
 321 void GuiWorkArea::setFullScreen(bool full_screen)
 322 {
 323         buffer_view_->setFullScreen(full_screen);
 324         if (full_screen) {
 325                 setFrameStyle(QFrame::NoFrame);
 326                 if (lyxrc.full_screen_scrollbar)
 327                         setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 328         } else {
 329 #ifdef Q_WS_MACX
 330                 setFrameStyle(QFrame::NoFrame);
 331 #else
 332                 setFrameStyle(QFrame::Box);
 333 #endif
 334                 setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
 335         }
 336 }
 337
 338
 339 BufferView & GuiWorkArea::bufferView()
 340 {
 341         return *buffer_view_;
 342 }
 343
 344
 345 BufferView const & GuiWorkArea::bufferView() const
 346 {
 347         return *buffer_view_;
 348 }
 349
 350
 351 void GuiWorkArea::stopBlinkingCursor()
 352 {
 353         cursor_timeout_.stop();
 354         hideCursor();
 355 }
 356
 357
 358 void GuiWorkArea::startBlinkingCursor()
 359 {
 360         showCursor();
 361         //we're not supposed to cache this value.
 362         int const time = QApplication::cursorFlashTime() / 2;
 363         if (time <= 0)
 364                 return;
 365         cursor_timeout_.setInterval(time);
 366         cursor_timeout_.start();
 367 }
 368
 369
 370 void GuiWorkArea::redraw()
 371 {
 372         if (!isVisible())
 373                 // No need to redraw in this case.
 374                 return;
 375
 376         // No need to do anything if this is the current view. The BufferView
 377         // metrics are already up to date.
 378         if (lyx_view_ != guiApp->currentView()
 379                 || lyx_view_->currentWorkArea() != this) {
 380                 // FIXME: it would be nice to optimize for the off-screen case.
 381                 buffer_view_->updateMetrics();
 382                 buffer_view_->cursor().fixIfBroken();
 383         }
 384
 385         // update cursor position, because otherwise it has to wait until
 386         // the blinking interval is over
 387         if (cursor_visible_) {
 388                 hideCursor();
 389                 showCursor();
 390         }
 391
 392         LYXERR(Debug::WORKAREA, "WorkArea::redraw screen");
 393         updateScreen();
 394         update(0, 0, viewport()->width(), viewport()->height());
 395
 396         /// \warning: scrollbar updating *must* be done after the BufferView is drawn
 397         /// because \c BufferView::updateScrollbar() is called in \c BufferView::draw().
 398         updateScrollbar();
 399         lyx_view_->updateStatusBar();
 400
 401         if (lyxerr.debugging(Debug::WORKAREA))
 402                 buffer_view_->coordCache().dump();
 403 }
 404
 405
 406 void GuiWorkArea::processKeySym(KeySymbol const & key, KeyModifier mod)
 407 {
 408         // In order to avoid bad surprise in the middle of an operation,
 409         // we better stop the blinking cursor...
 410         // the cursor gets restarted in GuiView::restartCursor()
 411         stopBlinkingCursor();
 412
 413         theLyXFunc().setLyXView(lyx_view_);
 414         theLyXFunc().processKeySym(key, mod);
 415 }
 416
 417
 418 void GuiWorkArea::dispatch(FuncRequest const & cmd0, KeyModifier mod)
 419 {
 420         // Handle drag&drop
 421         if (cmd0.action == LFUN_FILE_OPEN) {
 422                 lyx_view_->dispatch(cmd0);
 423                 return;
 424         }
 425
 426         theLyXFunc().setLyXView(lyx_view_);
 427
 428         FuncRequest cmd;
 429
 430         if (cmd0.action == LFUN_MOUSE_PRESS) {
 431                 if (mod == ShiftModifier)
 432                         cmd = FuncRequest(cmd0, "region-select");
 433                 else if (mod == ControlModifier)
 434                         cmd = FuncRequest(cmd0, "paragraph-select");
 435                 else
 436                         cmd = cmd0;
 437         }
 438         else
 439                 cmd = cmd0;
 440
 441         bool const notJustMovingTheMouse =
 442                 cmd.action != LFUN_MOUSE_MOTION || cmd.button() != mouse_button::none;
 443
 444         // In order to avoid bad surprise in the middle of an operation, we better stop
 445         // the blinking cursor.
 446         if (notJustMovingTheMouse)
 447                 stopBlinkingCursor();
 448
 449         buffer_view_->mouseEventDispatch(cmd);
 450
 451         // Skip these when selecting
 452         if (cmd.action != LFUN_MOUSE_MOTION) {
 453                 completer_.updateVisibility(false, false);
 454                 lyx_view_->updateLayoutList();
 455                 lyx_view_->updateToolbars();
 456         }
 457
 458         // GUI tweaks except with mouse motion with no button pressed.
 459         if (notJustMovingTheMouse) {
 460                 // Slight hack: this is only called currently when we
 461                 // clicked somewhere, so we force through the display
 462                 // of the new status here.
 463                 lyx_view_->clearMessage();
 464
 465                 // Show the cursor immediately after any operation
 466                 startBlinkingCursor();
 467         }
 468 }
 469
 470
 471 void GuiWorkArea::resizeBufferView()
 472 {
 473         // WARNING: Please don't put any code that will trigger a repaint here!
 474         // We are already inside a paint event.
 475         lyx_view_->setBusy(true);
 476         buffer_view_->resize(viewport()->width(), viewport()->height());
 477         updateScreen();
 478
 479         // Update scrollbars which might have changed due different
 480         // BufferView dimension. This is especially important when the
 481         // BufferView goes from zero-size to the real-size for the first time,
 482         // as the scrollbar paramters are then set for the first time.
 483         updateScrollbar();
 484
 485         lyx_view_->updateLayoutList();
 486         lyx_view_->setBusy(false);
 487         need_resize_ = false;
 488 }
 489
 490
 491 void GuiWorkArea::showCursor()
 492 {
 493         if (cursor_visible_)
 494                 return;
 495
 496         // RTL or not RTL
 497         bool l_shape = false;
 498         Font const & realfont = buffer_view_->cursor().real_current_font;
 499         BufferParams const & bp = buffer_view_->buffer().params();
 500         bool const samelang = realfont.language() == bp.language;
 501         bool const isrtl = realfont.isVisibleRightToLeft();
 502
 503         if (!samelang || isrtl != bp.language->rightToLeft())
 504                 l_shape = true;
 505
 506         // The ERT language hack needs fixing up
 507         if (realfont.language() == latex_language)
 508                 l_shape = false;
 509
 510         Font const font = buffer_view_->cursor().getFont();
 511         FontMetrics const & fm = theFontMetrics(font);
 512         int const asc = fm.maxAscent();
 513         int const des = fm.maxDescent();
 514         int h = asc + des;
 515         int x = 0;
 516         int y = 0;
 517         Cursor & cur = buffer_view_->cursor();
 518         cur.getPos(x, y);
 519         y -= asc;
 520
 521         // if it doesn't touch the screen, don't try to show it
 522         bool cursorInView = true;
 523         if (y + h < 0 || y >= viewport()->height())
 524                 cursorInView = false;
 525
 526         // show cursor on screen
 527         bool completable = cur.inset().showCompletionCursor()
 528                 && completer_.completionAvailable()
 529                 && !completer_.popupVisible()
 530                 && !completer_.inlineVisible();
 531         if (cursorInView) {
 532                 cursor_visible_ = true;
 533                 showCursor(x, y, h, l_shape, isrtl, completable);
 534         }
 535 }
 536
 537
 538 void GuiWorkArea::hideCursor()
 539 {
 540         if (!cursor_visible_)
 541                 return;
 542
 543         cursor_visible_ = false;
 544         removeCursor();
 545 }
 546
 547
 548 void GuiWorkArea::toggleCursor()
 549 {
 550         if (cursor_visible_)
 551                 hideCursor();
 552         else
 553                 showCursor();
 554 }
 555
 556
 557 void GuiWorkArea::updateScrollbar()
 558 {
 559         ScrollbarParameters const & scroll_ = buffer_view_->scrollbarParameters();
 560
 561         verticalScrollBar()->setRange(scroll_.min, scroll_.max);
 562         verticalScrollBar()->setPageStep(scroll_.page_step);
 563         verticalScrollBar()->setSingleStep(scroll_.single_step);
 564         // Block the scrollbar signal to prevent recursive signal/slot calling.
 565         verticalScrollBar()->blockSignals(true);
 566         verticalScrollBar()->setValue(scroll_.position);
 567         verticalScrollBar()->setSliderPosition(scroll_.position);
 568         verticalScrollBar()->blockSignals(false);
 569 }
 570
 571
 572 void GuiWorkArea::scrollTo(int value)
 573 {
 574         stopBlinkingCursor();
 575         buffer_view_->scrollDocView(value);
 576
 577         if (lyxrc.cursor_follows_scrollbar) {
 578                 buffer_view_->setCursorFromScrollbar();
 579                 lyx_view_->updateLayoutList();
 580         }
 581         // Show the cursor immediately after any operation.
 582         startBlinkingCursor();
 583         QApplication::syncX();
 584 }
 585
 586
 587 bool GuiWorkArea::event(QEvent * e)
 588 {
 589         switch (e->type()) {
 590         case QEvent::ToolTip: {
 591                 QHelpEvent * helpEvent = static_cast<QHelpEvent *>(e);
 592                 if (lyxrc.use_tooltip) {
 593                         QPoint pos = helpEvent->pos();
 594                         if (pos.x() < viewport()->width()) {
 595                                 QString s = toqstr(buffer_view_->toolTip(pos.x(), pos.y()));
 596                                 QToolTip::showText(helpEvent->globalPos(), s);
 597                         }
 598                         else
 599                                 QToolTip::hideText();
 600                 }
 601                 // Don't forget to accept the event!
 602                 e->accept();
 603                 return true;
 604         }
 605
 606         case QEvent::ShortcutOverride: {
 607                 // We catch this event in order to catch the Tab or Shift+Tab key press
 608                 // which are otherwise reserved to focus switching between controls
 609                 // within a dialog.
 610                 QKeyEvent * ke = static_cast<QKeyEvent*>(e);
 611                 if ((ke->key() != Qt::Key_Tab && ke->key() != Qt::Key_Backtab)
 612                         || ke->modifiers() & Qt::ControlModifier)
 613                         return QAbstractScrollArea::event(e);
 614                 keyPressEvent(ke);
 615                 return true;
 616         }
 617
 618         default:
 619                 return QAbstractScrollArea::event(e);
 620         }
 621         return false;
 622 }
 623
 624
 625 void GuiWorkArea::contextMenuEvent(QContextMenuEvent * e)
 626 {
 627         QPoint pos = e->pos();
 628         docstring name = buffer_view_->contextMenu(pos.x(), pos.y());
 629         if (name.empty()) {
 630                 QAbstractScrollArea::contextMenuEvent(e);
 631                 return;
 632         }
 633         QMenu * menu = guiApp->menus().menu(toqstr(name), *lyx_view_);
 634         if (!menu) {
 635                 QAbstractScrollArea::contextMenuEvent(e);
 636                 return;
 637         }
 638         // Position the menu to the right.
 639         // FIXME: menu position should be different for RTL text.
 640         menu->exec(e->globalPos());
 641         e->accept();
 642 }
 643
 644
 645 void GuiWorkArea::focusInEvent(QFocusEvent * e)
 646 {
 647         if (lyx_view_->currentWorkArea() != this)
 648                 lyx_view_->setCurrentWorkArea(this);
 649
 650         // Repaint the whole screen.
 651         // Note: this is different from redraw() as only the backing pixmap
 652         // will be redrawn, which is cheap.
 653         viewport()->repaint();
 654
 655         startBlinkingCursor();
 656         QAbstractScrollArea::focusInEvent(e);
 657 }
 658
 659
 660 void GuiWorkArea::focusOutEvent(QFocusEvent * e)
 661 {
 662         stopBlinkingCursor();
 663         QAbstractScrollArea::focusOutEvent(e);
 664 }
 665
 666
 667 void GuiWorkArea::mousePressEvent(QMouseEvent * e)
 668 {
 669         if (dc_event_.active && dc_event_ == *e) {
 670                 dc_event_.active = false;
 671                 FuncRequest cmd(LFUN_MOUSE_TRIPLE, e->x(), e->y(),
 672                         q_button_state(e->button()));
 673                 dispatch(cmd);
 674                 e->accept();
 675                 return;
 676         }
 677
 678         inputContext()->reset();
 679
 680         FuncRequest const cmd(LFUN_MOUSE_PRESS, e->x(), e->y(),
 681                 q_button_state(e->button()));
 682         dispatch(cmd, q_key_state(e->modifiers()));
 683         e->accept();
 684 }
 685
 686
 687 void GuiWorkArea::mouseReleaseEvent(QMouseEvent * e)
 688 {
 689         if (synthetic_mouse_event_.timeout.running())
 690                 synthetic_mouse_event_.timeout.stop();
 691
 692         FuncRequest const cmd(LFUN_MOUSE_RELEASE, e->x(), e->y(),
 693                               q_button_state(e->button()));
 694         dispatch(cmd);
 695         e->accept();
 696 }
 697
 698
 699 void GuiWorkArea::mouseMoveEvent(QMouseEvent * e)
 700 {
 701         // we kill the triple click if we move
 702         doubleClickTimeout();
 703         FuncRequest cmd(LFUN_MOUSE_MOTION, e->x(), e->y(),
 704                 q_motion_state(e->buttons()));
 705
 706         e->accept();
 707
 708         // If we're above or below the work area...
 709         if (e->y() <= 20 || e->y() >= viewport()->height() - 20) {
 710                 // Make sure only a synthetic event can cause a page scroll,
 711                 // so they come at a steady rate:
 712                 if (e->y() <= 20)
 713                         // _Force_ a scroll up:
 714                         cmd.y = -40;
 715                 else
 716                         cmd.y = viewport()->height();
 717                 // Store the event, to be handled when the timeout expires.
 718                 synthetic_mouse_event_.cmd = cmd;
 719
 720                 if (synthetic_mouse_event_.timeout.running())
 721                         // Discard the event. Note that it _may_ be handled
 722                         // when the timeout expires if
 723                         // synthetic_mouse_event_.cmd has not been overwritten.
 724                         // Ie, when the timeout expires, we handle the
 725                         // most recent event but discard all others that
 726                         // occurred after the one used to start the timeout
 727                         // in the first place.
 728                         return;
 729
 730                 synthetic_mouse_event_.restart_timeout = true;
 731                 synthetic_mouse_event_.timeout.start();
 732                 // Fall through to handle this event...
 733
 734         } else if (synthetic_mouse_event_.timeout.running()) {
 735                 // Store the event, to be possibly handled when the timeout
 736                 // expires.
 737                 // Once the timeout has expired, normal control is returned
 738                 // to mouseMoveEvent (restart_timeout = false).
 739                 // This results in a much smoother 'feel' when moving the
 740                 // mouse back into the work area.
 741                 synthetic_mouse_event_.cmd = cmd;
 742                 synthetic_mouse_event_.restart_timeout = false;
 743                 return;
 744         }
 745
 746         // Has anything changed on-screen since the last QMouseEvent
 747         // was received?
 748         double const scrollbar_value = verticalScrollBar()->value();
 749         if (e->x() == synthetic_mouse_event_.x_old
 750                 && e->y() == synthetic_mouse_event_.y_old
 751                 && scrollbar_value == synthetic_mouse_event_.scrollbar_value_old) {
 752                 // Nothing changed on-screen since the last QMouseEvent.
 753                 return;
 754         }
 755
 756         // Yes something has changed. Store the params used to check this.
 757         synthetic_mouse_event_.x_old = e->x();
 758         synthetic_mouse_event_.y_old = e->y();
 759         synthetic_mouse_event_.scrollbar_value_old = scrollbar_value;
 760
 761         // ... and dispatch the event to the LyX core.
 762         dispatch(cmd);
 763 }
 764
 765
 766 void GuiWorkArea::wheelEvent(QWheelEvent * ev)
 767 {
 768         // Wheel rotation by one notch results in a delta() of 120 (see
 769         // documentation of QWheelEvent)
 770         int delta = ev->delta() / 120;
 771         if (ev->modifiers() & Qt::ControlModifier) {
 772                 lyxrc.zoom -= 5 * delta;
 773                 if (lyxrc.zoom < 10)
 774                         lyxrc.zoom = 10;
 775                 // The global QPixmapCache is used in GuiPainter to cache text
 776                 // painting so we must reset it.
 777                 QPixmapCache::clear();
 778                 guiApp->fontLoader().update();
 779                 lyx::dispatch(FuncRequest(LFUN_SCREEN_FONT_UPDATE));
 780         } else {
 781                 double const lines = qApp->wheelScrollLines()
 782                         * lyxrc.mouse_wheel_speed * delta;
 783                 LYXERR(Debug::SCROLLING, "wheelScrollLines = " << qApp->wheelScrollLines()
 784                         << " delta = " << ev->delta() << " lines = " << lines);
 785                 verticalScrollBar()->setValue(verticalScrollBar()->value() -
 786                         int(lines *  verticalScrollBar()->singleStep()));
 787         }
 788         ev->accept();
 789 }
 790
 791
 792 void GuiWorkArea::generateSyntheticMouseEvent()
 793 {
 794         // Set things off to generate the _next_ 'pseudo' event.
 795         if (synthetic_mouse_event_.restart_timeout)
 796                 synthetic_mouse_event_.timeout.start();
 797
 798         // Has anything changed on-screen since the last timeout signal
 799         // was received?
 800         double const scrollbar_value = verticalScrollBar()->value();
 801         if (scrollbar_value != synthetic_mouse_event_.scrollbar_value_old) {
 802                 // Yes it has. Store the params used to check this.
 803                 synthetic_mouse_event_.scrollbar_value_old = scrollbar_value;
 804
 805                 // ... and dispatch the event to the LyX core.
 806                 dispatch(synthetic_mouse_event_.cmd);
 807         }
 808 }
 809
 810
 811 void GuiWorkArea::keyPressEvent(QKeyEvent * ev)
 812 {
 813         // intercept some keys if completion popup is visible
 814         if (completer_.popupVisible()) {
 815                 switch (ev->key()) {
 816                 case Qt::Key_Enter:
 817                 case Qt::Key_Return:
 818                         completer_.activate();
 819                         ev->accept();
 820                         return;
 821                 }
 822         }
 823
 824         // intercept keys for the completion
 825         if (ev->key() == Qt::Key_Tab) {
 826                 completer_.tab();
 827                 ev->accept();
 828                 return;
 829         }
 830
 831         if (completer_.popupVisible() && ev->key() == Qt::Key_Escape) {
 832                 completer_.hidePopup();
 833                 ev->accept();
 834                 return;
 835         }
 836
 837         if (completer_.inlineVisible() && ev->key() == Qt::Key_Escape) {
 838                 completer_.hideInline();
 839                 ev->accept();
 840                 return;
 841         }
 842
 843         // do nothing if there are other events
 844         // (the auto repeated events come too fast)
 845         // \todo FIXME: remove hard coded Qt keys, process the key binding
 846 #ifdef Q_WS_X11
 847         if (XEventsQueued(QX11Info::display(), 0) > 1 && ev->isAutoRepeat()
 848                         && (Qt::Key_PageDown || Qt::Key_PageUp)) {
 849                 LYXERR(Debug::KEY, "system is busy: scroll key event ignored");
 850                 ev->ignore();
 851                 return;
 852         }
 853 #endif
 854
 855         LYXERR(Debug::KEY, " count: " << ev->count()
 856                 << " text: " << fromqstr(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: " << fromqstr(e->preeditString())
 963                         << " commitString: " << fromqstr(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, /**/);
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, /**/);
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         return true;
1350 }
1351
1352
1353 void TabWorkArea::on_currentTabChanged(int i)
1354 {
1355         // returns e.g. on application destruction
1356         if (i == -1)
1357                 return;
1358         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i));
1359         LASSERT(wa, /**/);
1360         BufferView & bv = wa->bufferView();
1361         bv.cursor().fixIfBroken();
1362         bv.updateMetrics();
1363         wa->setUpdatesEnabled(true);
1364         wa->redraw();
1365         wa->setFocus();
1366         ///
1367         currentWorkAreaChanged(wa);
1368
1369         LYXERR(Debug::GUI, "currentTabChanged " << i
1370                 << "File" << bv.buffer().absFileName());
1371 }
1372
1373
1374 void TabWorkArea::closeCurrentBuffer()
1375 {
1376         if (clicked_tab_ != -1)
1377                 setCurrentIndex(clicked_tab_);
1378
1379         lyx::dispatch(FuncRequest(LFUN_BUFFER_CLOSE));
1380 }
1381
1382
1383 void TabWorkArea::closeCurrentTab()
1384 {
1385         if (clicked_tab_ == -1)
1386                 removeWorkArea(currentWorkArea());
1387         else {
1388                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(clicked_tab_));
1389                 LASSERT(wa, /**/);
1390                 removeWorkArea(wa);
1391         }
1392 }
1393
1394
1395 void TabWorkArea::updateTabText(GuiWorkArea * wa)
1396 {
1397         int const i = indexOf(wa);
1398         if (i < 0)
1399                 return;
1400         setTabText(i, wa->windowTitle());
1401 }
1402
1403
1404 void TabWorkArea::showContextMenu(const QPoint & pos)
1405 {
1406         // which tab?
1407         clicked_tab_ = static_cast<DragTabBar *>(tabBar())->tabAt(pos);
1408         if (clicked_tab_ != -1) {
1409                 // show tab popup
1410                 QMenu popup;
1411                 popup.addAction(QIcon(":/images/hidetab.png"),
1412                          qt_("Hide tab"), this, SLOT(closeCurrentTab()));
1413                 popup.addAction(QIcon(":/images/closetab.png"),
1414                          qt_("Close tab"), this, SLOT(closeCurrentBuffer()));
1415                 popup.exec(tabBar()->mapToGlobal(pos));
1416
1417                 clicked_tab_ = -1;
1418         }
1419 }
1420
1421
1422 void TabWorkArea::moveTab(int fromIndex, int toIndex)
1423 {
1424         QWidget * w = widget(fromIndex);
1425         QIcon icon = tabIcon(fromIndex);
1426         QString text = tabText(fromIndex);
1427
1428         setCurrentIndex(fromIndex);
1429         removeTab(fromIndex);
1430         insertTab(toIndex, w, icon, text);
1431         setCurrentIndex(toIndex);
1432 }
1433
1434
1435 DragTabBar::DragTabBar(QWidget* parent)
1436         : QTabBar(parent)
1437 {
1438         setAcceptDrops(true);
1439 }
1440
1441
1442 #if QT_VERSION < 0x040300
1443 int DragTabBar::tabAt(QPoint const & position) const
1444 {
1445         const int max = count();
1446         for (int i = 0; i < max; ++i) {
1447                 if (tabRect(i).contains(position))
1448                         return i;
1449         }
1450         return -1;
1451 }
1452 #endif
1453
1454
1455 void DragTabBar::mousePressEvent(QMouseEvent * event)
1456 {
1457         if (event->button() == Qt::LeftButton)
1458                 dragStartPos_ = event->pos();
1459         QTabBar::mousePressEvent(event);
1460 }
1461
1462
1463 void DragTabBar::mouseMoveEvent(QMouseEvent * event)
1464 {
1465         // If the left button isn't pressed anymore then return
1466         if (!(event->buttons() & Qt::LeftButton))
1467                 return;
1468
1469         // If the distance is too small then return
1470         if ((event->pos() - dragStartPos_).manhattanLength()
1471             < QApplication::startDragDistance())
1472                 return;
1473
1474         // did we hit something after all?
1475         int tab = tabAt(dragStartPos_);
1476         if (tab == -1)
1477                 return;
1478
1479         // simulate button release to remove highlight from button
1480         int i = currentIndex();
1481         QMouseEvent me(QEvent::MouseButtonRelease, dragStartPos_,
1482                 event->button(), event->buttons(), 0);
1483         QTabBar::mouseReleaseEvent(&me);
1484         setCurrentIndex(i);
1485
1486         // initiate Drag
1487         QDrag * drag = new QDrag(this);
1488         QMimeData * mimeData = new QMimeData;
1489         // a crude way to distinguish tab-reodering drops from other ones
1490         mimeData->setData("action", "tab-reordering") ;
1491         drag->setMimeData(mimeData);
1492
1493 #if QT_VERSION >= 0x040300
1494         // get tab pixmap as cursor
1495         QRect r = tabRect(tab);
1496         QPixmap pixmap(r.size());
1497         render(&pixmap, - r.topLeft());
1498         drag->setPixmap(pixmap);
1499         drag->exec();
1500 #else
1501         drag->start(Qt::MoveAction);
1502 #endif
1503
1504 }
1505
1506
1507 void DragTabBar::dragEnterEvent(QDragEnterEvent * event)
1508 {
1509         // Only accept if it's an tab-reordering request
1510         QMimeData const * m = event->mimeData();
1511         QStringList formats = m->formats();
1512         if (formats.contains("action")
1513             && m->data("action") == "tab-reordering")
1514                 event->acceptProposedAction();
1515 }
1516
1517
1518 void DragTabBar::dropEvent(QDropEvent * event)
1519 {
1520         int fromIndex = tabAt(dragStartPos_);
1521         int toIndex = tabAt(event->pos());
1522
1523         // Tell interested objects that
1524         if (fromIndex != toIndex)
1525                 tabMoveRequested(fromIndex, toIndex);
1526         event->acceptProposedAction();
1527 }
1528
1529
1530 } // namespace frontend
1531 } // namespace lyx
1532
1533 #include "GuiWorkArea_moc.cpp"