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