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_MAC
  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
 399 void GuiWorkArea::dispatch(FuncRequest const & cmd0, KeyModifier mod)
 400 {
 401         // Handle drag&drop
 402         if (cmd0.action == LFUN_FILE_OPEN) {
 403                 lyx_view_->dispatch(cmd0);
 404                 return;
 405         }
 406
 407         theLyXFunc().setLyXView(lyx_view_);
 408
 409         FuncRequest cmd;
 410
 411         if (cmd0.action == LFUN_MOUSE_PRESS) {
 412                 if (mod == ShiftModifier)
 413                         cmd = FuncRequest(cmd0, "region-select");
 414                 else if (mod == ControlModifier)
 415                         cmd = FuncRequest(cmd0, "paragraph-select");
 416                 else
 417                         cmd = cmd0;
 418         }
 419         else
 420                 cmd = cmd0;
 421
 422         bool const notJustMovingTheMouse =
 423                 cmd.action != LFUN_MOUSE_MOTION || cmd.button() != mouse_button::none;
 424
 425         // In order to avoid bad surprise in the middle of an operation, we better stop
 426         // the blinking cursor.
 427         if (notJustMovingTheMouse)
 428                 stopBlinkingCursor();
 429
 430         buffer_view_->mouseEventDispatch(cmd);
 431
 432         // Skip these when selecting
 433         if (cmd.action != LFUN_MOUSE_MOTION) {
 434                 completer_.updateVisibility(false, false);
 435                 lyx_view_->updateLayoutList();
 436                 lyx_view_->updateToolbars();
 437         }
 438
 439         // GUI tweaks except with mouse motion with no button pressed.
 440         if (notJustMovingTheMouse) {
 441                 // Slight hack: this is only called currently when we
 442                 // clicked somewhere, so we force through the display
 443                 // of the new status here.
 444                 lyx_view_->clearMessage();
 445
 446                 // Show the cursor immediately after any operation
 447                 startBlinkingCursor();
 448         }
 449 }
 450
 451
 452 void GuiWorkArea::resizeBufferView()
 453 {
 454         // WARNING: Please don't put any code that will trigger a repaint here!
 455         // We are already inside a paint event.
 456         lyx_view_->setBusy(true);
 457         buffer_view_->resize(viewport()->width(), viewport()->height());
 458         updateScreen();
 459
 460         // Update scrollbars which might have changed due different
 461         // BufferView dimension. This is especially important when the
 462         // BufferView goes from zero-size to the real-size for the first time,
 463         // as the scrollbar paramters are then set for the first time.
 464         updateScrollbar();
 465
 466         lyx_view_->updateLayoutList();
 467         lyx_view_->setBusy(false);
 468         need_resize_ = false;
 469 }
 470
 471
 472 void GuiWorkArea::showCursor()
 473 {
 474         if (cursor_visible_)
 475                 return;
 476
 477         // RTL or not RTL
 478         bool l_shape = false;
 479         Font const & realfont = buffer_view_->cursor().real_current_font;
 480         BufferParams const & bp = buffer_view_->buffer().params();
 481         bool const samelang = realfont.language() == bp.language;
 482         bool const isrtl = realfont.isVisibleRightToLeft();
 483
 484         if (!samelang || isrtl != bp.language->rightToLeft())
 485                 l_shape = true;
 486
 487         // The ERT language hack needs fixing up
 488         if (realfont.language() == latex_language)
 489                 l_shape = false;
 490
 491         Font const font = buffer_view_->cursor().getFont();
 492         FontMetrics const & fm = theFontMetrics(font);
 493         int const asc = fm.maxAscent();
 494         int const des = fm.maxDescent();
 495         int h = asc + des;
 496         int x = 0;
 497         int y = 0;
 498         Cursor & cur = buffer_view_->cursor();
 499         cur.getPos(x, y);
 500         y -= asc;
 501
 502         // if it doesn't touch the screen, don't try to show it
 503         bool cursorInView = true;
 504         if (y + h < 0 || y >= viewport()->height())
 505                 cursorInView = false;
 506
 507         // show cursor on screen
 508         bool completable = cur.inset().showCompletionCursor()
 509                 && completer_.completionAvailable()
 510                 && !completer_.popupVisible()
 511                 && !completer_.inlineVisible();
 512         if (cursorInView) {
 513                 cursor_visible_ = true;
 514                 showCursor(x, y, h, l_shape, isrtl, completable);
 515         }
 516 }
 517
 518
 519 void GuiWorkArea::hideCursor()
 520 {
 521         if (!cursor_visible_)
 522                 return;
 523
 524         cursor_visible_ = false;
 525         removeCursor();
 526 }
 527
 528
 529 void GuiWorkArea::toggleCursor()
 530 {
 531         if (cursor_visible_)
 532                 hideCursor();
 533         else
 534                 showCursor();
 535 }
 536
 537
 538 void GuiWorkArea::updateScrollbar()
 539 {
 540         ScrollbarParameters const & scroll_ = buffer_view_->scrollbarParameters();
 541
 542         verticalScrollBar()->setRange(scroll_.min, scroll_.max);
 543         verticalScrollBar()->setPageStep(scroll_.page_step);
 544         verticalScrollBar()->setSingleStep(scroll_.single_step);
 545         // Block the scrollbar signal to prevent recursive signal/slot calling.
 546         verticalScrollBar()->blockSignals(true);
 547         verticalScrollBar()->setValue(scroll_.position);
 548         verticalScrollBar()->setSliderPosition(scroll_.position);
 549         verticalScrollBar()->blockSignals(false);
 550 }
 551
 552
 553 void GuiWorkArea::scrollTo(int value)
 554 {
 555         stopBlinkingCursor();
 556         buffer_view_->scrollDocView(value);
 557
 558         if (lyxrc.cursor_follows_scrollbar) {
 559                 buffer_view_->setCursorFromScrollbar();
 560                 lyx_view_->updateLayoutList();
 561         }
 562         // Show the cursor immediately after any operation.
 563         startBlinkingCursor();
 564         QApplication::syncX();
 565 }
 566
 567
 568 bool GuiWorkArea::event(QEvent * e)
 569 {
 570         switch (e->type()) {
 571         case QEvent::ToolTip: {
 572                 QHelpEvent * helpEvent = static_cast<QHelpEvent *>(e);
 573                 if (lyxrc.use_tooltip) {
 574                         QPoint pos = helpEvent->pos();
 575                         if (pos.x() < viewport()->width()) {
 576                                 QString s = toqstr(buffer_view_->toolTip(pos.x(), pos.y()));
 577                                 QToolTip::showText(helpEvent->globalPos(), s);
 578                         }
 579                         else
 580                                 QToolTip::hideText();
 581                 }
 582                 // Don't forget to accept the event!
 583                 e->accept();
 584                 return true;
 585         }
 586
 587         case QEvent::ShortcutOverride: {
 588                 // We catch this event in order to catch the Tab or Shift+Tab key press
 589                 // which are otherwise reserved to focus switching between controls
 590                 // within a dialog.
 591                 QKeyEvent * ke = static_cast<QKeyEvent*>(e);
 592                 if ((ke->key() != Qt::Key_Tab && ke->key() != Qt::Key_Backtab)
 593                         || ke->modifiers() & Qt::ControlModifier)
 594                         return QAbstractScrollArea::event(e);
 595                 keyPressEvent(ke);
 596                 return true;
 597         }
 598
 599         default:
 600                 return QAbstractScrollArea::event(e);
 601         }
 602         return false;
 603 }
 604
 605
 606 void GuiWorkArea::contextMenuEvent(QContextMenuEvent * e)
 607 {
 608         QPoint pos = e->pos();
 609         docstring name = buffer_view_->contextMenu(pos.x(), pos.y());
 610         if (name.empty()) {
 611                 QAbstractScrollArea::contextMenuEvent(e);
 612                 return;
 613         }
 614         QMenu * menu = guiApp->menus().menu(toqstr(name), *lyx_view_);
 615         if (!menu) {
 616                 QAbstractScrollArea::contextMenuEvent(e);
 617                 return;
 618         }
 619         // Position the menu to the right.
 620         // FIXME: menu position should be different for RTL text.
 621         menu->exec(e->globalPos());
 622         e->accept();
 623 }
 624
 625
 626 void GuiWorkArea::focusInEvent(QFocusEvent * e)
 627 {
 628         if (lyx_view_->currentWorkArea() != this)
 629                 lyx_view_->setCurrentWorkArea(this);
 630
 631         // Repaint the whole screen.
 632         // Note: this is different from redraw() as only the backing pixmap
 633         // will be redrawn, which is cheap.
 634         viewport()->repaint();
 635
 636         startBlinkingCursor();
 637         QAbstractScrollArea::focusInEvent(e);
 638 }
 639
 640
 641 void GuiWorkArea::focusOutEvent(QFocusEvent * e)
 642 {
 643         stopBlinkingCursor();
 644         QAbstractScrollArea::focusOutEvent(e);
 645 }
 646
 647
 648 void GuiWorkArea::mousePressEvent(QMouseEvent * e)
 649 {
 650         if (dc_event_.active && dc_event_ == *e) {
 651                 dc_event_.active = false;
 652                 FuncRequest cmd(LFUN_MOUSE_TRIPLE, e->x(), e->y(),
 653                         q_button_state(e->button()));
 654                 dispatch(cmd);
 655                 e->accept();
 656                 return;
 657         }
 658
 659         inputContext()->reset();
 660
 661         FuncRequest const cmd(LFUN_MOUSE_PRESS, e->x(), e->y(),
 662                 q_button_state(e->button()));
 663         dispatch(cmd, q_key_state(e->modifiers()));
 664         e->accept();
 665 }
 666
 667
 668 void GuiWorkArea::mouseReleaseEvent(QMouseEvent * e)
 669 {
 670         if (synthetic_mouse_event_.timeout.running())
 671                 synthetic_mouse_event_.timeout.stop();
 672
 673         FuncRequest const cmd(LFUN_MOUSE_RELEASE, e->x(), e->y(),
 674                               q_button_state(e->button()));
 675         dispatch(cmd);
 676         e->accept();
 677 }
 678
 679
 680 void GuiWorkArea::mouseMoveEvent(QMouseEvent * e)
 681 {
 682         // we kill the triple click if we move
 683         doubleClickTimeout();
 684         FuncRequest cmd(LFUN_MOUSE_MOTION, e->x(), e->y(),
 685                 q_motion_state(e->buttons()));
 686
 687         e->accept();
 688
 689         // If we're above or below the work area...
 690         if (e->y() <= 20 || e->y() >= viewport()->height() - 20) {
 691                 // Make sure only a synthetic event can cause a page scroll,
 692                 // so they come at a steady rate:
 693                 if (e->y() <= 20)
 694                         // _Force_ a scroll up:
 695                         cmd.y = -40;
 696                 else
 697                         cmd.y = viewport()->height();
 698                 // Store the event, to be handled when the timeout expires.
 699                 synthetic_mouse_event_.cmd = cmd;
 700
 701                 if (synthetic_mouse_event_.timeout.running())
 702                         // Discard the event. Note that it _may_ be handled
 703                         // when the timeout expires if
 704                         // synthetic_mouse_event_.cmd has not been overwritten.
 705                         // Ie, when the timeout expires, we handle the
 706                         // most recent event but discard all others that
 707                         // occurred after the one used to start the timeout
 708                         // in the first place.
 709                         return;
 710
 711                 synthetic_mouse_event_.restart_timeout = true;
 712                 synthetic_mouse_event_.timeout.start();
 713                 // Fall through to handle this event...
 714
 715         } else if (synthetic_mouse_event_.timeout.running()) {
 716                 // Store the event, to be possibly handled when the timeout
 717                 // expires.
 718                 // Once the timeout has expired, normal control is returned
 719                 // to mouseMoveEvent (restart_timeout = false).
 720                 // This results in a much smoother 'feel' when moving the
 721                 // mouse back into the work area.
 722                 synthetic_mouse_event_.cmd = cmd;
 723                 synthetic_mouse_event_.restart_timeout = false;
 724                 return;
 725         }
 726
 727         // Has anything changed on-screen since the last QMouseEvent
 728         // was received?
 729         double const scrollbar_value = verticalScrollBar()->value();
 730         if (e->x() == synthetic_mouse_event_.x_old
 731                 && e->y() == synthetic_mouse_event_.y_old
 732                 && scrollbar_value == synthetic_mouse_event_.scrollbar_value_old) {
 733                 // Nothing changed on-screen since the last QMouseEvent.
 734                 return;
 735         }
 736
 737         // Yes something has changed. Store the params used to check this.
 738         synthetic_mouse_event_.x_old = e->x();
 739         synthetic_mouse_event_.y_old = e->y();
 740         synthetic_mouse_event_.scrollbar_value_old = scrollbar_value;
 741
 742         // ... and dispatch the event to the LyX core.
 743         dispatch(cmd);
 744 }
 745
 746
 747 void GuiWorkArea::wheelEvent(QWheelEvent * ev)
 748 {
 749         // Wheel rotation by one notch results in a delta() of 120 (see
 750         // documentation of QWheelEvent)
 751         int delta = ev->delta() / 120;
 752         if (ev->modifiers() & Qt::ControlModifier) {
 753                 lyxrc.zoom -= 5 * delta;
 754                 if (lyxrc.zoom < 10)
 755                         lyxrc.zoom = 10;
 756                 // The global QPixmapCache is used in GuiPainter to cache text
 757                 // painting so we must reset it.
 758                 QPixmapCache::clear();
 759                 guiApp->fontLoader().update();
 760                 lyx::dispatch(FuncRequest(LFUN_SCREEN_FONT_UPDATE));
 761         } else {
 762                 double const lines = qApp->wheelScrollLines()
 763                         * lyxrc.mouse_wheel_speed * delta;
 764                 LYXERR(Debug::SCROLLING, "wheelScrollLines = " << qApp->wheelScrollLines()
 765                         << " delta = " << ev->delta() << " lines = " << lines);
 766                 verticalScrollBar()->setValue(verticalScrollBar()->value() -
 767                         int(lines *  verticalScrollBar()->singleStep()));
 768         }
 769         ev->accept();
 770 }
 771
 772
 773 void GuiWorkArea::generateSyntheticMouseEvent()
 774 {
 775         // Set things off to generate the _next_ 'pseudo' event.
 776         if (synthetic_mouse_event_.restart_timeout)
 777                 synthetic_mouse_event_.timeout.start();
 778
 779         // Has anything changed on-screen since the last timeout signal
 780         // was received?
 781         double const scrollbar_value = verticalScrollBar()->value();
 782         if (scrollbar_value != synthetic_mouse_event_.scrollbar_value_old) {
 783                 // Yes it has. Store the params used to check this.
 784                 synthetic_mouse_event_.scrollbar_value_old = scrollbar_value;
 785
 786                 // ... and dispatch the event to the LyX core.
 787                 dispatch(synthetic_mouse_event_.cmd);
 788         }
 789 }
 790
 791
 792 void GuiWorkArea::keyPressEvent(QKeyEvent * ev)
 793 {
 794         // intercept some keys if completion popup is visible
 795         if (completer_.popupVisible()) {
 796                 switch (ev->key()) {
 797                 case Qt::Key_Enter:
 798                 case Qt::Key_Return:
 799                         completer_.activate();
 800                         ev->accept();
 801                         return;
 802                 }
 803         }
 804
 805         // intercept keys for the completion
 806         if (ev->key() == Qt::Key_Tab) {
 807                 completer_.tab();
 808                 ev->accept();
 809                 return;
 810         }
 811
 812         if (completer_.popupVisible() && ev->key() == Qt::Key_Escape) {
 813                 completer_.hidePopup();
 814                 ev->accept();
 815                 return;
 816         }
 817
 818         if (completer_.inlineVisible() && ev->key() == Qt::Key_Escape) {
 819                 completer_.hideInline();
 820                 ev->accept();
 821                 return;
 822         }
 823
 824         // do nothing if there are other events
 825         // (the auto repeated events come too fast)
 826         // \todo FIXME: remove hard coded Qt keys, process the key binding
 827 #ifdef Q_WS_X11
 828         if (XEventsQueued(QX11Info::display(), 0) > 1 && ev->isAutoRepeat()
 829                         && (Qt::Key_PageDown || Qt::Key_PageUp)) {
 830                 LYXERR(Debug::KEY, "system is busy: scroll key event ignored");
 831                 ev->ignore();
 832                 return;
 833         }
 834 #endif
 835
 836         LYXERR(Debug::KEY, " count: " << ev->count()
 837                 << " text: " << fromqstr(ev->text())
 838                 << " isAutoRepeat: " << ev->isAutoRepeat() << " key: " << ev->key());
 839
 840         KeySymbol sym;
 841         setKeySymbol(&sym, ev);
 842         processKeySym(sym, q_key_state(ev->modifiers()));
 843         ev->accept();
 844 }
 845
 846
 847 void GuiWorkArea::doubleClickTimeout()
 848 {
 849         dc_event_.active = false;
 850 }
 851
 852
 853 void GuiWorkArea::mouseDoubleClickEvent(QMouseEvent * ev)
 854 {
 855         dc_event_ = DoubleClick(ev);
 856         QTimer::singleShot(QApplication::doubleClickInterval(), this,
 857                            SLOT(doubleClickTimeout()));
 858         FuncRequest cmd(LFUN_MOUSE_DOUBLE,
 859                         ev->x(), ev->y(),
 860                         q_button_state(ev->button()));
 861         dispatch(cmd);
 862         ev->accept();
 863 }
 864
 865
 866 void GuiWorkArea::resizeEvent(QResizeEvent * ev)
 867 {
 868         QAbstractScrollArea::resizeEvent(ev);
 869         need_resize_ = true;
 870         ev->accept();
 871 }
 872
 873
 874 void GuiWorkArea::update(int x, int y, int w, int h)
 875 {
 876         viewport()->repaint(x, y, w, h);
 877 }
 878
 879
 880 void GuiWorkArea::paintEvent(QPaintEvent * ev)
 881 {
 882         QRect const rc = ev->rect();
 883         // LYXERR(Debug::PAINTING, "paintEvent begin: x: " << rc.x()
 884         //      << " y: " << rc.y() << " w: " << rc.width() << " h: " << rc.height());
 885
 886         if (need_resize_) {
 887                 screen_ = QPixmap(viewport()->width(), viewport()->height());
 888                 resizeBufferView();
 889                 hideCursor();
 890                 showCursor();
 891         }
 892
 893         QPainter pain(viewport());
 894         pain.drawPixmap(rc, screen_, rc);
 895         cursor_->draw(pain);
 896         ev->accept();
 897 }
 898
 899
 900 void GuiWorkArea::updateScreen()
 901 {
 902         GuiPainter pain(&screen_);
 903         buffer_view_->draw(pain);
 904 }
 905
 906
 907 void GuiWorkArea::showCursor(int x, int y, int h,
 908         bool l_shape, bool rtl, bool completable)
 909 {
 910         if (schedule_redraw_) {
 911                 buffer_view_->updateMetrics();
 912                 updateScreen();
 913                 viewport()->update(QRect(0, 0, viewport()->width(), viewport()->height()));
 914                 schedule_redraw_ = false;
 915                 // Show the cursor immediately after the update.
 916                 hideCursor();
 917                 toggleCursor();
 918                 return;
 919         }
 920
 921         cursor_->update(x, y, h, l_shape, rtl, completable);
 922         cursor_->show();
 923         viewport()->update(cursor_->rect());
 924 }
 925
 926
 927 void GuiWorkArea::removeCursor()
 928 {
 929         cursor_->hide();
 930         //if (!qApp->focusWidget())
 931                 viewport()->update(cursor_->rect());
 932 }
 933
 934
 935 void GuiWorkArea::inputMethodEvent(QInputMethodEvent * e)
 936 {
 937         QString const & commit_string = e->commitString();
 938         docstring const & preedit_string
 939                 = qstring_to_ucs4(e->preeditString());
 940
 941         if (!commit_string.isEmpty()) {
 942
 943                 LYXERR(Debug::KEY, "preeditString: " << fromqstr(e->preeditString())
 944                         << " commitString: " << fromqstr(e->commitString()));
 945
 946                 int key = 0;
 947
 948                 // FIXME Iwami 04/01/07: we should take care also of UTF16 surrogates here.
 949                 for (int i = 0; i != commit_string.size(); ++i) {
 950                         QKeyEvent ev(QEvent::KeyPress, key, Qt::NoModifier, commit_string[i]);
 951                         keyPressEvent(&ev);
 952                 }
 953         }
 954
 955         // Hide the cursor during the kana-kanji transformation.
 956         if (preedit_string.empty())
 957                 startBlinkingCursor();
 958         else
 959                 stopBlinkingCursor();
 960
 961         // last_width : for checking if last preedit string was/wasn't empty.
 962         static bool last_width = false;
 963         if (!last_width && preedit_string.empty()) {
 964                 // if last_width is last length of preedit string.
 965                 e->accept();
 966                 return;
 967         }
 968
 969         GuiPainter pain(&screen_);
 970         buffer_view_->updateMetrics();
 971         buffer_view_->draw(pain);
 972         FontInfo font = buffer_view_->cursor().getFont().fontInfo();
 973         FontMetrics const & fm = theFontMetrics(font);
 974         int height = fm.maxHeight();
 975         int cur_x = cursor_->rect().left();
 976         int cur_y = cursor_->rect().bottom();
 977
 978         // redraw area of preedit string.
 979         update(0, cur_y - height, viewport()->width(),
 980                 (height + 1) * preedit_lines_);
 981
 982         if (preedit_string.empty()) {
 983                 last_width = false;
 984                 preedit_lines_ = 1;
 985                 e->accept();
 986                 return;
 987         }
 988         last_width = true;
 989
 990         // att : stores an IM attribute.
 991         QList<QInputMethodEvent::Attribute> const & att = e->attributes();
 992
 993         // get attributes of input method cursor.
 994         // cursor_pos : cursor position in preedit string.
 995         size_t cursor_pos = 0;
 996         bool cursor_is_visible = false;
 997         for (int i = 0; i != att.size(); ++i) {
 998                 if (att.at(i).type == QInputMethodEvent::Cursor) {
 999                         cursor_pos = att.at(i).start;
1000                         cursor_is_visible = att.at(i).length != 0;
1001                         break;
1002                 }
1003         }
1004
1005         size_t preedit_length = preedit_string.length();
1006
1007         // get position of selection in input method.
1008         // FIXME: isn't there a way to do this simplier?
1009         // rStart : cursor position in selected string in IM.
1010         size_t rStart = 0;
1011         // rLength : selected string length in IM.
1012         size_t rLength = 0;
1013         if (cursor_pos < preedit_length) {
1014                 for (int i = 0; i != att.size(); ++i) {
1015                         if (att.at(i).type == QInputMethodEvent::TextFormat) {
1016                                 if (att.at(i).start <= int(cursor_pos)
1017                                         && int(cursor_pos) < att.at(i).start + att.at(i).length) {
1018                                                 rStart = att.at(i).start;
1019                                                 rLength = att.at(i).length;
1020                                                 if (!cursor_is_visible)
1021                                                         cursor_pos += rLength;
1022                                                 break;
1023                                 }
1024                         }
1025                 }
1026         }
1027         else {
1028                 rStart = cursor_pos;
1029                 rLength = 0;
1030         }
1031
1032         int const right_margin = buffer_view_->rightMargin();
1033         Painter::preedit_style ps;
1034         // Most often there would be only one line:
1035         preedit_lines_ = 1;
1036         for (size_t pos = 0; pos != preedit_length; ++pos) {
1037                 char_type const typed_char = preedit_string[pos];
1038                 // reset preedit string style
1039                 ps = Painter::preedit_default;
1040
1041                 // if we reached the right extremity of the screen, go to next line.
1042                 if (cur_x + fm.width(typed_char) > viewport()->width() - right_margin) {
1043                         cur_x = right_margin;
1044                         cur_y += height + 1;
1045                         ++preedit_lines_;
1046                 }
1047                 // preedit strings are displayed with dashed underline
1048                 // and partial strings are displayed white on black indicating
1049                 // that we are in selecting mode in the input method.
1050                 // FIXME: rLength == preedit_length is not a changing condition
1051                 // FIXME: should be put out of the loop.
1052                 if (pos >= rStart
1053                         && pos < rStart + rLength
1054                         && !(cursor_pos < rLength && rLength == preedit_length))
1055                         ps = Painter::preedit_selecting;
1056
1057                 if (pos == cursor_pos
1058                         && (cursor_pos < rLength && rLength == preedit_length))
1059                         ps = Painter::preedit_cursor;
1060
1061                 // draw one character and update cur_x.
1062                 cur_x += pain.preeditText(cur_x, cur_y, typed_char, font, ps);
1063         }
1064
1065         // update the preedit string screen area.
1066         update(0, cur_y - preedit_lines_*height, viewport()->width(),
1067                 (height + 1) * preedit_lines_);
1068
1069         // Don't forget to accept the event!
1070         e->accept();
1071 }
1072
1073
1074 QVariant GuiWorkArea::inputMethodQuery(Qt::InputMethodQuery query) const
1075 {
1076         QRect cur_r(0,0,0,0);
1077         switch (query) {
1078                 // this is the CJK-specific composition window position.
1079                 case Qt::ImMicroFocus:
1080                         cur_r = cursor_->rect();
1081                         if (preedit_lines_ != 1)
1082                                 cur_r.moveLeft(10);
1083                         cur_r.moveBottom(cur_r.bottom() + cur_r.height() * preedit_lines_);
1084                         // return lower right of cursor in LyX.
1085                         return cur_r;
1086                 default:
1087                         return QWidget::inputMethodQuery(query);
1088         }
1089 }
1090
1091
1092 void GuiWorkArea::updateWindowTitle()
1093 {
1094         docstring maximize_title;
1095         docstring minimize_title;
1096
1097         Buffer & buf = buffer_view_->buffer();
1098         FileName const fileName = buf.fileName();
1099         if (!fileName.empty()) {
1100                 maximize_title = fileName.displayName(30);
1101                 minimize_title = from_utf8(fileName.onlyFileName());
1102                 if (!buf.isClean()) {
1103                         maximize_title += _(" (changed)");
1104                         minimize_title += char_type('*');
1105                 }
1106                 if (buf.isReadonly())
1107                         maximize_title += _(" (read only)");
1108         }
1109
1110         QString title = windowTitle();
1111         QString new_title = toqstr(maximize_title);
1112         if (title == new_title)
1113                 return;
1114
1115         QWidget::setWindowTitle(new_title);
1116         QWidget::setWindowIconText(toqstr(minimize_title));
1117         titleChanged(this);
1118 }
1119
1120
1121 void GuiWorkArea::setReadOnly(bool)
1122 {
1123         updateWindowTitle();
1124         if (this == lyx_view_->currentWorkArea())
1125                 lyx_view_->updateBufferDependent(false);
1126 }
1127
1128
1129 bool GuiWorkArea::isFullScreen()
1130 {
1131         return lyx_view_ && lyx_view_->isFullScreen();
1132 }
1133
1134
1135 ////////////////////////////////////////////////////////////////////
1136 //
1137 // TabWorkArea
1138 //
1139 ////////////////////////////////////////////////////////////////////
1140
1141 #ifdef Q_WS_MACX
1142 class NoTabFrameMacStyle : public QMacStyle {
1143 public:
1144         ///
1145         QRect subElementRect(SubElement element, const QStyleOption * option,
1146                              const QWidget * widget = 0 ) const
1147         {
1148                 QRect rect = QMacStyle::subElementRect(element, option, widget);
1149                 bool noBar = static_cast<QTabWidget const *>(widget)->count() <= 1;
1150
1151                 // The Qt Mac style puts the contents into a 3 pixel wide box
1152                 // which looks very ugly and not like other Mac applications.
1153                 // Hence we remove this here, and moreover the 16 pixel round
1154                 // frame above if the tab bar is hidden.
1155                 if (element == QStyle::SE_TabWidgetTabContents) {
1156                         rect.adjust(- rect.left(), 0, rect.left(), 0);
1157                         if (noBar)
1158                                 rect.setTop(0);
1159                 }
1160
1161                 return rect;
1162         }
1163 };
1164
1165 NoTabFrameMacStyle noTabFrameMacStyle;
1166 #endif
1167
1168
1169 TabWorkArea::TabWorkArea(QWidget * parent)
1170         : QTabWidget(parent), clicked_tab_(-1)
1171 {
1172 #ifdef Q_WS_MACX
1173         setStyle(&noTabFrameMacStyle);
1174 #endif
1175
1176         QPalette pal = palette();
1177         pal.setColor(QPalette::Active, QPalette::Button,
1178                 pal.color(QPalette::Active, QPalette::Window));
1179         pal.setColor(QPalette::Disabled, QPalette::Button,
1180                 pal.color(QPalette::Disabled, QPalette::Window));
1181         pal.setColor(QPalette::Inactive, QPalette::Button,
1182                 pal.color(QPalette::Inactive, QPalette::Window));
1183
1184         QObject::connect(this, SIGNAL(currentChanged(int)),
1185                 this, SLOT(on_currentTabChanged(int)));
1186
1187         QToolButton * closeBufferButton = new QToolButton(this);
1188         closeBufferButton->setPalette(pal);
1189         // FIXME: rename the icon to closebuffer.png
1190         closeBufferButton->setIcon(QIcon(":/images/closetab.png"));
1191         closeBufferButton->setText("Close File");
1192         closeBufferButton->setAutoRaise(true);
1193         closeBufferButton->setCursor(Qt::ArrowCursor);
1194         closeBufferButton->setToolTip(qt_("Close File"));
1195         closeBufferButton->setEnabled(true);
1196         QObject::connect(closeBufferButton, SIGNAL(clicked()),
1197                 this, SLOT(closeCurrentBuffer()));
1198         setCornerWidget(closeBufferButton, Qt::TopRightCorner);
1199
1200         // setup drag'n'drop
1201         QTabBar* tb = new DragTabBar;
1202         connect(tb, SIGNAL(tabMoveRequested(int, int)),
1203                 this, SLOT(moveTab(int, int)));
1204         setTabBar(tb);
1205
1206         // make us responsible for the context menu of the tabbar
1207         tb->setContextMenuPolicy(Qt::CustomContextMenu);
1208         connect(tb, SIGNAL(customContextMenuRequested(const QPoint &)),
1209                 this, SLOT(showContextMenu(const QPoint &)));
1210
1211         setUsesScrollButtons(true);
1212 }
1213
1214
1215 void TabWorkArea::setFullScreen(bool full_screen)
1216 {
1217         for (int i = 0; i != count(); ++i) {
1218                 if (GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i)))
1219                         wa->setFullScreen(full_screen);
1220         }
1221
1222         if (lyxrc.full_screen_tabbar)
1223                 showBar(!full_screen && count()>1);
1224 }
1225
1226
1227 void TabWorkArea::showBar(bool show)
1228 {
1229         tabBar()->setEnabled(show);
1230         tabBar()->setVisible(show);
1231 }
1232
1233
1234 GuiWorkArea * TabWorkArea::currentWorkArea()
1235 {
1236         if (count() == 0)
1237                 return 0;
1238
1239         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(currentWidget());
1240         BOOST_ASSERT(wa);
1241         return wa;
1242 }
1243
1244
1245 GuiWorkArea * TabWorkArea::workArea(Buffer & buffer)
1246 {
1247         for (int i = 0; i != count(); ++i) {
1248                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i));
1249                 BOOST_ASSERT(wa);
1250                 if (&wa->bufferView().buffer() == &buffer)
1251                         return wa;
1252         }
1253         return 0;
1254 }
1255
1256
1257 void TabWorkArea::closeAll()
1258 {
1259         while (count()) {
1260                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(0));
1261                 BOOST_ASSERT(wa);
1262                 removeTab(0);
1263                 delete wa;
1264         }
1265 }
1266
1267
1268 bool TabWorkArea::setCurrentWorkArea(GuiWorkArea * work_area)
1269 {
1270         BOOST_ASSERT(work_area);
1271         int index = indexOf(work_area);
1272         if (index == -1)
1273                 return false;
1274
1275         if (index == currentIndex())
1276                 // Make sure the work area is up to date.
1277                 on_currentTabChanged(index);
1278         else
1279                 // Switch to the work area.
1280                 setCurrentIndex(index);
1281         work_area->setFocus();
1282
1283         return true;
1284 }
1285
1286
1287 GuiWorkArea * TabWorkArea::addWorkArea(Buffer & buffer, GuiView & view)
1288 {
1289         GuiWorkArea * wa = new GuiWorkArea(buffer, view);
1290         wa->setUpdatesEnabled(false);
1291         // Hide tabbar if there's no tab (avoid a resize and a flashing tabbar
1292         // when hiding it again below).
1293         if (!(currentWorkArea() && currentWorkArea()->isFullScreen()))
1294                 showBar(count() > 0);
1295         addTab(wa, wa->windowTitle());
1296         QObject::connect(wa, SIGNAL(titleChanged(GuiWorkArea *)),
1297                 this, SLOT(updateTabText(GuiWorkArea *)));
1298         if (currentWorkArea() && currentWorkArea()->isFullScreen())
1299                 setFullScreen(true);
1300         else
1301                 // Hide tabbar if there's only one tab.
1302                 showBar(count() > 1);
1303
1304         return wa;
1305 }
1306
1307
1308 bool TabWorkArea::removeWorkArea(GuiWorkArea * work_area)
1309 {
1310         BOOST_ASSERT(work_area);
1311         int index = indexOf(work_area);
1312         if (index == -1)
1313                 return false;
1314
1315         work_area->setUpdatesEnabled(false);
1316         removeTab(index);
1317         delete work_area;
1318
1319         if (count()) {
1320                 // make sure the next work area is enabled.
1321                 currentWidget()->setUpdatesEnabled(true);
1322                 if ((currentWorkArea() && currentWorkArea()->isFullScreen()))
1323                         setFullScreen(true);
1324                 else
1325                         // Hide tabbar if there's only one tab.
1326                         showBar(count() > 1);
1327         } else
1328                 lastWorkAreaRemoved();
1329
1330         return true;
1331 }
1332
1333
1334 void TabWorkArea::on_currentTabChanged(int i)
1335 {
1336         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i));
1337         BOOST_ASSERT(wa);
1338         BufferView & bv = wa->bufferView();
1339         bv.cursor().fixIfBroken();
1340         bv.updateMetrics();
1341         wa->setUpdatesEnabled(true);
1342         wa->redraw();
1343         wa->setFocus();
1344         ///
1345         currentWorkAreaChanged(wa);
1346
1347         LYXERR(Debug::GUI, "currentTabChanged " << i
1348                 << "File" << bv.buffer().absFileName());
1349 }
1350
1351
1352 void TabWorkArea::closeCurrentBuffer()
1353 {
1354         if (clicked_tab_ != -1)
1355                 setCurrentIndex(clicked_tab_);
1356
1357         lyx::dispatch(FuncRequest(LFUN_BUFFER_CLOSE));
1358 }
1359
1360
1361 void TabWorkArea::closeCurrentTab()
1362 {
1363         if (clicked_tab_ == -1)
1364                 removeWorkArea(currentWorkArea());
1365         else {
1366                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(clicked_tab_));
1367                 BOOST_ASSERT(wa);
1368                 removeWorkArea(wa);
1369         }
1370 }
1371
1372
1373 void TabWorkArea::updateTabText(GuiWorkArea * wa)
1374 {
1375         int const i = indexOf(wa);
1376         if (i < 0)
1377                 return;
1378         setTabText(i, wa->windowTitle());
1379 }
1380
1381
1382 void TabWorkArea::showContextMenu(const QPoint & pos)
1383 {
1384         // which tab?
1385         clicked_tab_ = static_cast<DragTabBar *>(tabBar())->tabAt(pos);
1386         if (clicked_tab_ != -1) {
1387                 // show tab popup
1388                 QMenu popup;
1389                 popup.addAction(QIcon(":/images/hidetab.png"),
1390                          qt_("Hide tab"), this, SLOT(closeCurrentTab()));
1391                 popup.addAction(QIcon(":/images/closetab.png"),
1392                          qt_("Close tab"), this, SLOT(closeCurrentBuffer()));
1393                 popup.exec(tabBar()->mapToGlobal(pos));
1394
1395                 clicked_tab_ = -1;
1396         }
1397 }
1398
1399
1400 void TabWorkArea::moveTab(int fromIndex, int toIndex)
1401 {
1402         QWidget * w = widget(fromIndex);
1403         QIcon icon = tabIcon(fromIndex);
1404         QString text = tabText(fromIndex);
1405
1406         setCurrentIndex(fromIndex);
1407         removeTab(fromIndex);
1408         insertTab(toIndex, w, icon, text);
1409         setCurrentIndex(toIndex);
1410 }
1411
1412
1413 DragTabBar::DragTabBar(QWidget* parent)
1414         : QTabBar(parent)
1415 {
1416         setAcceptDrops(true);
1417 }
1418
1419
1420 #if QT_VERSION < 0x040300
1421 int DragTabBar::tabAt(QPoint const & position) const
1422 {
1423         const int max = count();
1424         for (int i = 0; i < max; ++i) {
1425                 if (tabRect(i).contains(position))
1426                         return i;
1427         }
1428         return -1;
1429 }
1430 #endif
1431
1432
1433 void DragTabBar::mousePressEvent(QMouseEvent * event)
1434 {
1435         if (event->button() == Qt::LeftButton)
1436                 dragStartPos_ = event->pos();
1437         QTabBar::mousePressEvent(event);
1438 }
1439
1440
1441 void DragTabBar::mouseMoveEvent(QMouseEvent * event)
1442 {
1443         // If the left button isn't pressed anymore then return
1444         if (!(event->buttons() & Qt::LeftButton))
1445                 return;
1446
1447         // If the distance is too small then return
1448         if ((event->pos() - dragStartPos_).manhattanLength()
1449             < QApplication::startDragDistance())
1450                 return;
1451
1452         // did we hit something after all?
1453         int tab = tabAt(dragStartPos_);
1454         if (tab == -1)
1455                 return;
1456
1457         // simulate button release to remove highlight from button
1458         int i = currentIndex();
1459         QMouseEvent me(QEvent::MouseButtonRelease, dragStartPos_,
1460                 event->button(), event->buttons(), 0);
1461         QTabBar::mouseReleaseEvent(&me);
1462         setCurrentIndex(i);
1463
1464         // initiate Drag
1465         QDrag * drag = new QDrag(this);
1466         QMimeData * mimeData = new QMimeData;
1467         // a crude way to distinguish tab-reodering drops from other ones
1468         mimeData->setData("action", "tab-reordering") ;
1469         drag->setMimeData(mimeData);
1470
1471 #if QT_VERSION >= 0x040300
1472         // get tab pixmap as cursor
1473         QRect r = tabRect(tab);
1474         QPixmap pixmap(r.size());
1475         render(&pixmap, - r.topLeft());
1476         drag->setPixmap(pixmap);
1477         drag->exec();
1478 #else
1479         drag->start(Qt::MoveAction);
1480 #endif
1481
1482 }
1483
1484
1485 void DragTabBar::dragEnterEvent(QDragEnterEvent * event)
1486 {
1487         // Only accept if it's an tab-reordering request
1488         QMimeData const * m = event->mimeData();
1489         QStringList formats = m->formats();
1490         if (formats.contains("action")
1491             && m->data("action") == "tab-reordering")
1492                 event->acceptProposedAction();
1493 }
1494
1495
1496 void DragTabBar::dropEvent(QDropEvent * event)
1497 {
1498         int fromIndex = tabAt(dragStartPos_);
1499         int toIndex = tabAt(event->pos());
1500
1501         // Tell interested objects that
1502         if (fromIndex != toIndex)
1503                 tabMoveRequested(fromIndex, toIndex);
1504         event->acceptProposedAction();
1505 }
1506
1507
1508 } // namespace frontend
1509 } // namespace lyx
1510
1511 #include "GuiWorkArea_moc.cpp"