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 "ColorCache.h"
  17 #include "FontLoader.h"
  18 #include "Menus.h"
  19
  20 #include "Buffer.h"
  21 #include "BufferList.h"
  22 #include "BufferParams.h"
  23 #include "BufferView.h"
  24 #include "CoordCache.h"
  25 #include "Cursor.h"
  26 #include "Font.h"
  27 #include "FuncRequest.h"
  28 #include "GuiApplication.h"
  29 #include "GuiCompleter.h"
  30 #include "GuiKeySymbol.h"
  31 #include "GuiPainter.h"
  32 #include "GuiView.h"
  33 #include "KeySymbol.h"
  34 #include "Language.h"
  35 #include "LyXFunc.h"
  36 #include "LyXRC.h"
  37 #include "LyXVC.h"
  38 #include "MetricsInfo.h"
  39 #include "qt_helpers.h"
  40 #include "Text.h"
  41 #include "version.h"
  42
  43 #include "graphics/GraphicsImage.h"
  44 #include "graphics/GraphicsLoader.h"
  45
  46 #include "support/convert.h"
  47 #include "support/debug.h"
  48 #include "support/gettext.h"
  49 #include "support/FileName.h"
  50
  51 #include "frontends/Application.h"
  52 #include "frontends/FontMetrics.h"
  53 #include "frontends/WorkAreaManager.h"
  54
  55 #include <QContextMenuEvent>
  56 #include <QInputContext>
  57 #include <QHelpEvent>
  58 #ifdef Q_WS_MACX
  59 #include <QMacStyle>
  60 #endif
  61 #include <QMainWindow>
  62 #include <QMenu>
  63 #include <QPainter>
  64 #include <QPalette>
  65 #include <QPixmapCache>
  66 #include <QScrollBar>
  67 #include <QTimer>
  68 #include <QToolButton>
  69 #include <QToolTip>
  70 #include <QMenuBar>
  71
  72 #include <boost/bind.hpp>
  73
  74 #include <cmath>
  75
  76 #ifdef Q_WS_X11
  77 #include <QX11Info>
  78 extern "C" int XEventsQueued(Display *display, int mode);
  79 #endif
  80
  81 #ifdef Q_WS_WIN
  82 int const CursorWidth = 2;
  83 #else
  84 int const CursorWidth = 1;
  85 #endif
  86 int const TabIndicatorWidth = 3;
  87
  88 #undef KeyPress
  89 #undef NoModifier
  90
  91 using namespace std;
  92 using namespace lyx::support;
  93
  94 namespace lyx {
  95
  96
  97 /// return the LyX mouse button state from Qt's
  98 static mouse_button::state q_button_state(Qt::MouseButton button)
  99 {
 100         mouse_button::state b = mouse_button::none;
 101         switch (button) {
 102                 case Qt::LeftButton:
 103                         b = mouse_button::button1;
 104                         break;
 105                 case Qt::MidButton:
 106                         b = mouse_button::button2;
 107                         break;
 108                 case Qt::RightButton:
 109                         b = mouse_button::button3;
 110                         break;
 111                 default:
 112                         break;
 113         }
 114         return b;
 115 }
 116
 117
 118 /// return the LyX mouse button state from Qt's
 119 mouse_button::state q_motion_state(Qt::MouseButtons state)
 120 {
 121         mouse_button::state b = mouse_button::none;
 122         if (state & Qt::LeftButton)
 123                 b |= mouse_button::button1;
 124         if (state & Qt::MidButton)
 125                 b |= mouse_button::button2;
 126         if (state & Qt::RightButton)
 127                 b |= mouse_button::button3;
 128         return b;
 129 }
 130
 131
 132 namespace frontend {
 133
 134 class CursorWidget {
 135 public:
 136         CursorWidget() {}
 137
 138         void draw(QPainter & painter)
 139         {
 140                 if (!show_ || !rect_.isValid())
 141                         return;
 142
 143                 int y = rect_.top();
 144                 int l = x_ - rect_.left();
 145                 int r = rect_.right() - x_;
 146                 int bot = rect_.bottom();
 147
 148                 // draw vertica linel
 149                 painter.fillRect(x_, y, CursorWidth, rect_.height(), color_);
 150
 151                 // draw RTL/LTR indication
 152                 painter.setPen(color_);
 153                 if (l_shape_) {
 154                         if (rtl_)
 155                                 painter.drawLine(x_, bot, x_ - l, bot);
 156                         else
 157                                 painter.drawLine(x_, bot, x_ + CursorWidth + r, bot);
 158                 }
 159
 160                 // draw completion triangle
 161                 if (completable_) {
 162                         int m = y + rect_.height() / 2;
 163                         int d = TabIndicatorWidth - 1;
 164                         if (rtl_) {
 165                                 painter.drawLine(x_ - 1, m - d, x_ - 1 - d, m);
 166                                 painter.drawLine(x_ - 1, m + d, x_ - 1 - d, m);
 167                         } else {
 168                                 painter.drawLine(x_ + CursorWidth, m - d, x_ + CursorWidth + d, m);
 169                                 painter.drawLine(x_ + CursorWidth, m + d, x_ + CursorWidth + d, m);
 170                         }
 171                 }
 172         }
 173
 174         void update(int x, int y, int h, bool l_shape,
 175                 bool rtl, bool completable)
 176         {
 177                 color_ = guiApp->colorCache().get(Color_cursor);
 178                 l_shape_ = l_shape;
 179                 rtl_ = rtl;
 180                 completable_ = completable;
 181                 x_ = x;
 182
 183                 // extension to left and right
 184                 int l = 0;
 185                 int r = 0;
 186
 187                 // RTL/LTR indication
 188                 if (l_shape_) {
 189                         if (rtl)
 190                                 l += h / 3;
 191                         else
 192                                 r += h / 3;
 193                 }
 194
 195                 // completion triangle
 196                 if (completable_) {
 197                         if (rtl)
 198                                 l = max(l, TabIndicatorWidth);
 199                         else
 200                                 r = max(r, TabIndicatorWidth);
 201                 }
 202
 203                 // compute overall rectangle
 204                 rect_ = QRect(x - l, y, CursorWidth + r + l, h);
 205         }
 206
 207         void show(bool set_show = true) { show_ = set_show; }
 208         void hide() { show_ = false; }
 209
 210         QRect const & rect() { return rect_; }
 211
 212 private:
 213         /// cursor is in RTL or LTR text
 214         bool rtl_;
 215         /// indication for RTL or LTR
 216         bool l_shape_;
 217         /// triangle to show that a completion is available
 218         bool completable_;
 219         ///
 220         bool show_;
 221         ///
 222         QColor color_;
 223         /// rectangle, possibly with l_shape and completion triangle
 224         QRect rect_;
 225         /// x position (were the vertical line is drawn)
 226         int x_;
 227 };
 228
 229
 230 // This is a 'heartbeat' generating synthetic mouse move events when the
 231 // cursor is at the top or bottom edge of the viewport. One scroll per 0.2 s
 232 SyntheticMouseEvent::SyntheticMouseEvent()
 233         : timeout(200), restart_timeout(true),
 234           x_old(-1), y_old(-1), scrollbar_value_old(-1.0)
 235 {}
 236
 237
 238 GuiWorkArea::GuiWorkArea(QWidget *)
 239         : buffer_view_(0), lyx_view_(0),
 240         cursor_visible_(false),
 241         need_resize_(false), schedule_redraw_(false),
 242         preedit_lines_(1), completer_(new GuiCompleter(this))
 243 {
 244 }
 245
 246
 247 GuiWorkArea::GuiWorkArea(Buffer & buffer, GuiView & gv)
 248         : buffer_view_(0), lyx_view_(0),
 249         cursor_visible_(false),
 250         need_resize_(false), schedule_redraw_(false),
 251         preedit_lines_(1), completer_(new GuiCompleter(this))
 252 {
 253         setGuiView(gv);
 254         setBuffer(buffer);
 255         init();
 256 }
 257
 258
 259 void GuiWorkArea::init()
 260 {
 261         // Setup the signals
 262         connect(&cursor_timeout_, SIGNAL(timeout()),
 263                 this, SLOT(toggleCursor()));
 264
 265         int const time = QApplication::cursorFlashTime() / 2;
 266         if (time > 0) {
 267                 cursor_timeout_.setInterval(time);
 268                 cursor_timeout_.start();
 269         } else {
 270                 // let's initialize this just to be safe
 271                 cursor_timeout_.setInterval(500);
 272         }
 273
 274         screen_ = QPixmap(viewport()->width(), viewport()->height());
 275         cursor_ = new frontend::CursorWidget();
 276         cursor_->hide();
 277
 278         setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 279         setAcceptDrops(true);
 280         setMouseTracking(true);
 281         setMinimumSize(100, 70);
 282         setFrameStyle(QFrame::NoFrame);
 283         updateWindowTitle();
 284
 285         viewport()->setAutoFillBackground(false);
 286         // We don't need double-buffering nor SystemBackground on
 287         // the viewport because we have our own backing pixmap.
 288         viewport()->setAttribute(Qt::WA_NoSystemBackground);
 289
 290         setFocusPolicy(Qt::StrongFocus);
 291
 292         viewport()->setCursor(Qt::IBeamCursor);
 293
 294         synthetic_mouse_event_.timeout.timeout.connect(
 295                 boost::bind(&GuiWorkArea::generateSyntheticMouseEvent,
 296                                         this));
 297
 298         // Initialize the vertical Scroll Bar
 299         QObject::connect(verticalScrollBar(), SIGNAL(valueChanged(int)),
 300                 this, SLOT(scrollTo(int)));
 301
 302         LYXERR(Debug::GUI, "viewport width: " << viewport()->width()
 303                 << "  viewport height: " << viewport()->height());
 304
 305         // Enables input methods for asian languages.
 306         // Must be set when creating custom text editing widgets.
 307         setAttribute(Qt::WA_InputMethodEnabled, true);
 308
 309         dialog_mode_ = false;
 310 }
 311
 312
 313 GuiWorkArea::~GuiWorkArea()
 314 {
 315         buffer_view_->buffer().workAreaManager().remove(this);
 316         delete buffer_view_;
 317         delete cursor_;
 318         // Completer has a QObject parent and is thus automatically destroyed.
 319         // delete completer_;
 320 }
 321
 322
 323 void GuiWorkArea::setGuiView(GuiView & gv)
 324 {
 325         lyx_view_ = &gv;
 326 }
 327
 328
 329 void GuiWorkArea::setBuffer(Buffer & buffer)
 330 {
 331         delete buffer_view_;
 332         buffer_view_ = new BufferView(buffer),
 333         buffer.workAreaManager().add(this);
 334
 335         // HACK: Prevents an additional redraw when the scrollbar pops up
 336         // which regularily happens on documents with more than one page.
 337         // The policy  should be set to "Qt::ScrollBarAsNeeded" soon.
 338         // Since we have no geometry information yet, we assume that
 339         // a document needs a scrollbar if there is more then four
 340         // paragraph in the outermost text.
 341         if (buffer.text().paragraphs().size() > 4)
 342                 setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
 343         QTimer::singleShot(50, this, SLOT(fixVerticalScrollBar()));
 344 }
 345
 346
 347 void GuiWorkArea::fixVerticalScrollBar()
 348 {
 349         if (!isFullScreen())
 350                 setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
 351 }
 352
 353
 354 void GuiWorkArea::close()
 355 {
 356         lyx_view_->removeWorkArea(this);
 357 }
 358
 359
 360 void GuiWorkArea::setFullScreen(bool full_screen)
 361 {
 362         buffer_view_->setFullScreen(full_screen);
 363         if (full_screen) {
 364                 setFrameStyle(QFrame::NoFrame);
 365                 if (lyxrc.full_screen_scrollbar)
 366                         setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 367         } else {
 368 #ifdef Q_WS_MACX
 369                 setFrameStyle(QFrame::NoFrame);
 370 #else
 371                 setFrameStyle(QFrame::Box);
 372 #endif
 373                 setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
 374         }
 375 }
 376
 377
 378 BufferView & GuiWorkArea::bufferView()
 379 {
 380         return *buffer_view_;
 381 }
 382
 383
 384 BufferView const & GuiWorkArea::bufferView() const
 385 {
 386         return *buffer_view_;
 387 }
 388
 389
 390 void GuiWorkArea::stopBlinkingCursor()
 391 {
 392         cursor_timeout_.stop();
 393         hideCursor();
 394 }
 395
 396
 397 void GuiWorkArea::startBlinkingCursor()
 398 {
 399         showCursor();
 400         //we're not supposed to cache this value.
 401         int const time = QApplication::cursorFlashTime() / 2;
 402         if (time <= 0)
 403                 return;
 404         cursor_timeout_.setInterval(time);
 405         cursor_timeout_.start();
 406 }
 407
 408
 409 void GuiWorkArea::redraw()
 410 {
 411         if (!isVisible())
 412                 // No need to redraw in this case.
 413                 return;
 414
 415         // No need to do anything if this is the current view. The BufferView
 416         // metrics are already up to date.
 417         if (lyx_view_ != guiApp->currentView()
 418                 || lyx_view_->currentWorkArea() != this) {
 419                 // FIXME: it would be nice to optimize for the off-screen case.
 420                 buffer_view_->updateMetrics();
 421                 buffer_view_->cursor().fixIfBroken();
 422         }
 423
 424         // update cursor position, because otherwise it has to wait until
 425         // the blinking interval is over
 426         if (cursor_visible_) {
 427                 hideCursor();
 428                 showCursor();
 429         }
 430
 431         LYXERR(Debug::WORKAREA, "WorkArea::redraw screen");
 432         updateScreen();
 433         update(0, 0, viewport()->width(), viewport()->height());
 434
 435         /// \warning: scrollbar updating *must* be done after the BufferView is drawn
 436         /// because \c BufferView::updateScrollbar() is called in \c BufferView::draw().
 437         updateScrollbar();
 438         lyx_view_->updateStatusBar();
 439
 440         if (lyxerr.debugging(Debug::WORKAREA))
 441                 buffer_view_->coordCache().dump();
 442 }
 443
 444
 445 void GuiWorkArea::processKeySym(KeySymbol const & key, KeyModifier mod)
 446 {
 447         if (lyx_view_->isFullScreen() && lyx_view_->menuBar()->isVisible()) {
 448                 // FIXME HACK: we should not have to do this here. See related comment
 449                 // in GuiView::event() (QEvent::ShortcutOverride)
 450                 lyx_view_->menuBar()->hide();
 451         }
 452
 453         // In order to avoid bad surprise in the middle of an operation,
 454         // we better stop the blinking cursor...
 455         // the cursor gets restarted in GuiView::restartCursor()
 456         stopBlinkingCursor();
 457
 458         theLyXFunc().setLyXView(lyx_view_);
 459         theLyXFunc().processKeySym(key, mod);
 460 }
 461
 462
 463 void GuiWorkArea::dispatch(FuncRequest const & cmd0, KeyModifier mod)
 464 {
 465         // Handle drag&drop
 466         if (cmd0.action == LFUN_FILE_OPEN) {
 467                 lyx_view_->dispatch(cmd0);
 468                 return;
 469         }
 470
 471         theLyXFunc().setLyXView(lyx_view_);
 472
 473         FuncRequest cmd;
 474
 475         if (cmd0.action == LFUN_MOUSE_PRESS) {
 476                 if (mod == ShiftModifier)
 477                         cmd = FuncRequest(cmd0, "region-select");
 478                 else if (mod == ControlModifier)
 479                         cmd = FuncRequest(cmd0, "paragraph-select");
 480                 else
 481                         cmd = cmd0;
 482         }
 483         else
 484                 cmd = cmd0;
 485
 486         bool const notJustMovingTheMouse =
 487                 cmd.action != LFUN_MOUSE_MOTION || cmd.button() != mouse_button::none;
 488
 489         // In order to avoid bad surprise in the middle of an operation, we better stop
 490         // the blinking cursor.
 491         if (notJustMovingTheMouse)
 492                 stopBlinkingCursor();
 493
 494         buffer_view_->mouseEventDispatch(cmd);
 495
 496         // Skip these when selecting
 497         if (cmd.action != LFUN_MOUSE_MOTION) {
 498                 completer_->updateVisibility(false, false);
 499                 lyx_view_->updateDialogs();
 500                 lyx_view_->updateStatusBar();
 501         }
 502
 503         // GUI tweaks except with mouse motion with no button pressed.
 504         if (notJustMovingTheMouse) {
 505                 // Slight hack: this is only called currently when we
 506                 // clicked somewhere, so we force through the display
 507                 // of the new status here.
 508                 lyx_view_->clearMessage();
 509
 510                 // Show the cursor immediately after any operation
 511                 startBlinkingCursor();
 512         }
 513 }
 514
 515
 516 void GuiWorkArea::resizeBufferView()
 517 {
 518         // WARNING: Please don't put any code that will trigger a repaint here!
 519         // We are already inside a paint event.
 520         lyx_view_->setBusy(true);
 521         Point p;
 522         int h = 0;
 523         buffer_view_->cursorPosAndHeight(p, h);
 524         bool const cursor_in_view = buffer_view_->cursorInView(p, h);
 525         buffer_view_->resize(viewport()->width(), viewport()->height());
 526         if (cursor_in_view)
 527                 buffer_view_->scrollToCursor();
 528         updateScreen();
 529
 530         // Update scrollbars which might have changed due different
 531         // BufferView dimension. This is especially important when the
 532         // BufferView goes from zero-size to the real-size for the first time,
 533         // as the scrollbar paramters are then set for the first time.
 534         updateScrollbar();
 535
 536         lyx_view_->updateLayoutList();
 537         lyx_view_->setBusy(false);
 538         need_resize_ = false;
 539 }
 540
 541
 542 void GuiWorkArea::showCursor()
 543 {
 544         if (cursor_visible_)
 545                 return;
 546
 547         // RTL or not RTL
 548         bool l_shape = false;
 549         Font const & realfont = buffer_view_->cursor().real_current_font;
 550         BufferParams const & bp = buffer_view_->buffer().params();
 551         bool const samelang = realfont.language() == bp.language;
 552         bool const isrtl = realfont.isVisibleRightToLeft();
 553
 554         if (!samelang || isrtl != bp.language->rightToLeft())
 555                 l_shape = true;
 556
 557         // The ERT language hack needs fixing up
 558         if (realfont.language() == latex_language)
 559                 l_shape = false;
 560
 561         Point p;
 562         int h = 0;
 563         buffer_view_->cursorPosAndHeight(p, h);
 564         // show cursor on screen
 565         Cursor & cur = buffer_view_->cursor();
 566         bool completable = cur.inset().showCompletionCursor()
 567                 && completer_->completionAvailable()
 568                 && !completer_->popupVisible()
 569                 && !completer_->inlineVisible();
 570         if (buffer_view_->cursorInView(p, h)) {
 571                 cursor_visible_ = true;
 572                 showCursor(p.x_, p.y_, h, l_shape, isrtl, completable);
 573         }
 574 }
 575
 576
 577 void GuiWorkArea::hideCursor()
 578 {
 579         if (!cursor_visible_)
 580                 return;
 581
 582         cursor_visible_ = false;
 583         removeCursor();
 584 }
 585
 586
 587 void GuiWorkArea::toggleCursor()
 588 {
 589         if (cursor_visible_)
 590                 hideCursor();
 591         else
 592                 showCursor();
 593 }
 594
 595
 596 void GuiWorkArea::updateScrollbar()
 597 {
 598         ScrollbarParameters const & scroll_ = buffer_view_->scrollbarParameters();
 599         // WARNING: don't touch at the scrollbar value like this:
 600         //   verticalScrollBar()->setValue(scroll_.position);
 601         // because this would cause a recursive signal/slot calling with
 602         // GuiWorkArea::scrollTo
 603         verticalScrollBar()->setRange(scroll_.min, scroll_.max);
 604         verticalScrollBar()->setPageStep(scroll_.page_step);
 605         verticalScrollBar()->setSingleStep(scroll_.single_step);
 606         verticalScrollBar()->setSliderPosition(scroll_.position);
 607 }
 608
 609
 610 void GuiWorkArea::scrollTo(int value)
 611 {
 612         stopBlinkingCursor();
 613         buffer_view_->scrollDocView(value);
 614
 615         if (lyxrc.cursor_follows_scrollbar) {
 616                 buffer_view_->setCursorFromScrollbar();
 617                 lyx_view_->updateLayoutList();
 618         }
 619         // Show the cursor immediately after any operation.
 620         startBlinkingCursor();
 621         QApplication::syncX();
 622 }
 623
 624
 625 bool GuiWorkArea::event(QEvent * e)
 626 {
 627         switch (e->type()) {
 628         case QEvent::ToolTip: {
 629                 QHelpEvent * helpEvent = static_cast<QHelpEvent *>(e);
 630                 if (lyxrc.use_tooltip) {
 631                         QPoint pos = helpEvent->pos();
 632                         if (pos.x() < viewport()->width()) {
 633                                 QString s = toqstr(buffer_view_->toolTip(pos.x(), pos.y()));
 634                                 QToolTip::showText(helpEvent->globalPos(), s);
 635                         }
 636                         else
 637                                 QToolTip::hideText();
 638                 }
 639                 // Don't forget to accept the event!
 640                 e->accept();
 641                 return true;
 642         }
 643
 644         case QEvent::ShortcutOverride: {
 645                 // We catch this event in order to catch the Tab or Shift+Tab key press
 646                 // which are otherwise reserved to focus switching between controls
 647                 // within a dialog.
 648                 QKeyEvent * ke = static_cast<QKeyEvent*>(e);
 649                 if ((ke->key() != Qt::Key_Tab && ke->key() != Qt::Key_Backtab)
 650                         || ke->modifiers() & Qt::ControlModifier)
 651                         return QAbstractScrollArea::event(e);
 652                 keyPressEvent(ke);
 653                 return true;
 654         }
 655
 656         default:
 657                 return QAbstractScrollArea::event(e);
 658         }
 659         return false;
 660 }
 661
 662
 663 void GuiWorkArea::contextMenuEvent(QContextMenuEvent * e)
 664 {
 665         QPoint pos = e->pos();
 666         docstring name = buffer_view_->contextMenu(pos.x(), pos.y());
 667         if (name.empty()) {
 668                 QAbstractScrollArea::contextMenuEvent(e);
 669                 return;
 670         }
 671         QMenu * menu = guiApp->menus().menu(toqstr(name), *lyx_view_);
 672         if (!menu) {
 673                 QAbstractScrollArea::contextMenuEvent(e);
 674                 return;
 675         }
 676         // Position the menu to the right.
 677         // FIXME: menu position should be different for RTL text.
 678         menu->exec(e->globalPos());
 679         e->accept();
 680 }
 681
 682
 683 void GuiWorkArea::focusInEvent(QFocusEvent * e)
 684 {
 685         /*
 686         LYXERR(Debug::DEBUG, "GuiWorkArea::focusInEvent(): " << this << std::endl);
 687         GuiWorkArea * old_gwa = theGuiApp()->currentView()->currentWorkArea();
 688         if (old_gwa)
 689                 old_gwa->stopBlinkingCursor();
 690         lyx_view_->setCurrentWorkArea(this);
 691         */
 692
 693         if (lyx_view_->currentWorkArea() != this)
 694                 lyx_view_->setCurrentWorkArea(this);
 695
 696         startBlinkingCursor();
 697         QAbstractScrollArea::focusInEvent(e);
 698 }
 699
 700
 701 void GuiWorkArea::focusOutEvent(QFocusEvent * e)
 702 {
 703         LYXERR(Debug::DEBUG, "GuiWorkArea::focusOutEvent(): " << this << std::endl);
 704         stopBlinkingCursor();
 705         QAbstractScrollArea::focusOutEvent(e);
 706 }
 707
 708
 709 void GuiWorkArea::mousePressEvent(QMouseEvent * e)
 710 {
 711         if (dc_event_.active && dc_event_ == *e) {
 712                 dc_event_.active = false;
 713                 FuncRequest cmd(LFUN_MOUSE_TRIPLE, e->x(), e->y(),
 714                         q_button_state(e->button()));
 715                 dispatch(cmd);
 716                 e->accept();
 717                 return;
 718         }
 719
 720         inputContext()->reset();
 721
 722         FuncRequest const cmd(LFUN_MOUSE_PRESS, e->x(), e->y(),
 723                 q_button_state(e->button()));
 724         dispatch(cmd, q_key_state(e->modifiers()));
 725         e->accept();
 726 }
 727
 728
 729 void GuiWorkArea::mouseReleaseEvent(QMouseEvent * e)
 730 {
 731         if (synthetic_mouse_event_.timeout.running())
 732                 synthetic_mouse_event_.timeout.stop();
 733
 734         FuncRequest const cmd(LFUN_MOUSE_RELEASE, e->x(), e->y(),
 735                               q_button_state(e->button()));
 736         dispatch(cmd);
 737         e->accept();
 738 }
 739
 740
 741 void GuiWorkArea::mouseMoveEvent(QMouseEvent * e)
 742 {
 743         // we kill the triple click if we move
 744         doubleClickTimeout();
 745         FuncRequest cmd(LFUN_MOUSE_MOTION, e->x(), e->y(),
 746                 q_motion_state(e->buttons()));
 747
 748         e->accept();
 749
 750         // If we're above or below the work area...
 751         if (e->y() <= 20 || e->y() >= viewport()->height() - 20) {
 752                 // Make sure only a synthetic event can cause a page scroll,
 753                 // so they come at a steady rate:
 754                 if (e->y() <= 20)
 755                         // _Force_ a scroll up:
 756                         cmd.y = -40;
 757                 else
 758                         cmd.y = viewport()->height();
 759                 // Store the event, to be handled when the timeout expires.
 760                 synthetic_mouse_event_.cmd = cmd;
 761
 762                 if (synthetic_mouse_event_.timeout.running())
 763                         // Discard the event. Note that it _may_ be handled
 764                         // when the timeout expires if
 765                         // synthetic_mouse_event_.cmd has not been overwritten.
 766                         // Ie, when the timeout expires, we handle the
 767                         // most recent event but discard all others that
 768                         // occurred after the one used to start the timeout
 769                         // in the first place.
 770                         return;
 771
 772                 synthetic_mouse_event_.restart_timeout = true;
 773                 synthetic_mouse_event_.timeout.start();
 774                 // Fall through to handle this event...
 775
 776         } else if (synthetic_mouse_event_.timeout.running()) {
 777                 // Store the event, to be possibly handled when the timeout
 778                 // expires.
 779                 // Once the timeout has expired, normal control is returned
 780                 // to mouseMoveEvent (restart_timeout = false).
 781                 // This results in a much smoother 'feel' when moving the
 782                 // mouse back into the work area.
 783                 synthetic_mouse_event_.cmd = cmd;
 784                 synthetic_mouse_event_.restart_timeout = false;
 785                 return;
 786         }
 787
 788         // Has anything changed on-screen since the last QMouseEvent
 789         // was received?
 790         double const scrollbar_value = verticalScrollBar()->value();
 791         if (e->x() == synthetic_mouse_event_.x_old
 792                 && e->y() == synthetic_mouse_event_.y_old
 793                 && scrollbar_value == synthetic_mouse_event_.scrollbar_value_old) {
 794                 // Nothing changed on-screen since the last QMouseEvent.
 795                 return;
 796         }
 797
 798         // Yes something has changed. Store the params used to check this.
 799         synthetic_mouse_event_.x_old = e->x();
 800         synthetic_mouse_event_.y_old = e->y();
 801         synthetic_mouse_event_.scrollbar_value_old = scrollbar_value;
 802
 803         // ... and dispatch the event to the LyX core.
 804         dispatch(cmd);
 805 }
 806
 807
 808 void GuiWorkArea::wheelEvent(QWheelEvent * ev)
 809 {
 810         // Wheel rotation by one notch results in a delta() of 120 (see
 811         // documentation of QWheelEvent)
 812         int const delta = ev->delta() / 120;
 813         if (ev->modifiers() & Qt::ControlModifier) {
 814                 docstring arg = convert<docstring>(5 * delta);
 815                 lyx::dispatch(FuncRequest(LFUN_BUFFER_ZOOM_IN, arg));
 816                 return;
 817         }
 818
 819         // Take into account the desktop wide settings.
 820         int const lines = qApp->wheelScrollLines();
 821         int const page_step = verticalScrollBar()->pageStep();
 822         // Test if the wheel mouse is set to one screen at a time.
 823         int scroll_value = lines > page_step
 824                 ? page_step : lines * verticalScrollBar()->singleStep();
 825
 826         // Take into account the rotation.
 827         scroll_value *= delta;
 828
 829         // Take into account user preference.
 830         scroll_value *= lyxrc.mouse_wheel_speed;
 831         LYXERR(Debug::SCROLLING, "wheelScrollLines = " << lines
 832                         << " delta = " << delta << " scroll_value = " << scroll_value
 833                         << " page_step = " << page_step);
 834         // Now scroll.
 835         verticalScrollBar()->setValue(verticalScrollBar()->value() - scroll_value);
 836
 837         ev->accept();
 838 }
 839
 840
 841 void GuiWorkArea::generateSyntheticMouseEvent()
 842 {
 843         // Set things off to generate the _next_ 'pseudo' event.
 844         if (synthetic_mouse_event_.restart_timeout)
 845                 synthetic_mouse_event_.timeout.start();
 846
 847         // Has anything changed on-screen since the last timeout signal
 848         // was received?
 849         double const scrollbar_value = verticalScrollBar()->value();
 850         if (scrollbar_value != synthetic_mouse_event_.scrollbar_value_old) {
 851                 // Yes it has. Store the params used to check this.
 852                 synthetic_mouse_event_.scrollbar_value_old = scrollbar_value;
 853
 854                 // ... and dispatch the event to the LyX core.
 855                 dispatch(synthetic_mouse_event_.cmd);
 856         }
 857 }
 858
 859
 860 void GuiWorkArea::keyPressEvent(QKeyEvent * ev)
 861 {
 862         // Do not process here some keys if dialog_mode_ is set
 863         if (dialog_mode_
 864                 && (ev->modifiers() == Qt::NoModifier
 865                     || ev->modifiers() == Qt::ShiftModifier)
 866                 && (ev->key() == Qt::Key_Escape
 867                     || ev->key() == Qt::Key_Enter
 868                     || ev->key() == Qt::Key_Return)
 869             ) {
 870                 ev->ignore();
 871                 return;
 872         }
 873
 874         // intercept some keys if completion popup is visible
 875         if (completer_->popupVisible()) {
 876                 switch (ev->key()) {
 877                 case Qt::Key_Enter:
 878                 case Qt::Key_Return:
 879                         completer_->activate();
 880                         ev->accept();
 881                         return;
 882                 }
 883         }
 884
 885         // do nothing if there are other events
 886         // (the auto repeated events come too fast)
 887         // \todo FIXME: remove hard coded Qt keys, process the key binding
 888 #ifdef Q_WS_X11
 889         if (XEventsQueued(QX11Info::display(), 0) > 1 && ev->isAutoRepeat()
 890                         && (Qt::Key_PageDown || Qt::Key_PageUp)) {
 891                 LYXERR(Debug::KEY, "system is busy: scroll key event ignored");
 892                 ev->ignore();
 893                 return;
 894         }
 895 #endif
 896
 897         LYXERR(Debug::KEY, " count: " << ev->count() << " text: " << ev->text()
 898                 << " isAutoRepeat: " << ev->isAutoRepeat() << " key: " << ev->key());
 899
 900         KeySymbol sym;
 901         setKeySymbol(&sym, ev);
 902         processKeySym(sym, q_key_state(ev->modifiers()));
 903         ev->accept();
 904 }
 905
 906
 907 void GuiWorkArea::doubleClickTimeout()
 908 {
 909         dc_event_.active = false;
 910 }
 911
 912
 913 void GuiWorkArea::mouseDoubleClickEvent(QMouseEvent * ev)
 914 {
 915         dc_event_ = DoubleClick(ev);
 916         QTimer::singleShot(QApplication::doubleClickInterval(), this,
 917                            SLOT(doubleClickTimeout()));
 918         FuncRequest cmd(LFUN_MOUSE_DOUBLE,
 919                         ev->x(), ev->y(),
 920                         q_button_state(ev->button()));
 921         dispatch(cmd);
 922         ev->accept();
 923 }
 924
 925
 926 void GuiWorkArea::resizeEvent(QResizeEvent * ev)
 927 {
 928         QAbstractScrollArea::resizeEvent(ev);
 929         need_resize_ = true;
 930         ev->accept();
 931 }
 932
 933
 934 void GuiWorkArea::update(int x, int y, int w, int h)
 935 {
 936         viewport()->repaint(x, y, w, h);
 937 }
 938
 939
 940 void GuiWorkArea::paintEvent(QPaintEvent * ev)
 941 {
 942         QRect const rc = ev->rect();
 943         // LYXERR(Debug::PAINTING, "paintEvent begin: x: " << rc.x()
 944         //      << " y: " << rc.y() << " w: " << rc.width() << " h: " << rc.height());
 945
 946         if (need_resize_) {
 947                 screen_ = QPixmap(viewport()->width(), viewport()->height());
 948                 resizeBufferView();
 949                 hideCursor();
 950                 showCursor();
 951         }
 952
 953         QPainter pain(viewport());
 954         pain.drawPixmap(rc, screen_, rc);
 955         cursor_->draw(pain);
 956         ev->accept();
 957 }
 958
 959
 960 void GuiWorkArea::updateScreen()
 961 {
 962         GuiPainter pain(&screen_);
 963         buffer_view_->draw(pain);
 964 }
 965
 966
 967 void GuiWorkArea::showCursor(int x, int y, int h,
 968         bool l_shape, bool rtl, bool completable)
 969 {
 970         if (schedule_redraw_) {
 971                 // This happens when a graphic conversion is finished. As we don't know
 972                 // the size of the new graphics, it's better the update everything.
 973                 // We can't use redraw() here because this would trigger a infinite
 974                 // recursive loop with showCursor().
 975                 buffer_view_->resize(viewport()->width(), viewport()->height());
 976                 updateScreen();
 977                 updateScrollbar();
 978                 viewport()->update(QRect(0, 0, viewport()->width(), viewport()->height()));
 979                 schedule_redraw_ = false;
 980                 // Show the cursor immediately after the update.
 981                 hideCursor();
 982                 toggleCursor();
 983                 return;
 984         }
 985
 986         cursor_->update(x, y, h, l_shape, rtl, completable);
 987         cursor_->show();
 988         viewport()->update(cursor_->rect());
 989 }
 990
 991
 992 void GuiWorkArea::removeCursor()
 993 {
 994         cursor_->hide();
 995         //if (!qApp->focusWidget())
 996                 viewport()->update(cursor_->rect());
 997 }
 998
 999
1000 void GuiWorkArea::inputMethodEvent(QInputMethodEvent * e)
1001 {
1002         QString const & commit_string = e->commitString();
1003         docstring const & preedit_string
1004                 = qstring_to_ucs4(e->preeditString());
1005
1006         if (!commit_string.isEmpty()) {
1007
1008                 LYXERR(Debug::KEY, "preeditString: " << e->preeditString()
1009                         << " commitString: " << e->commitString());
1010
1011                 int key = 0;
1012
1013                 // FIXME Iwami 04/01/07: we should take care also of UTF16 surrogates here.
1014                 for (int i = 0; i != commit_string.size(); ++i) {
1015                         QKeyEvent ev(QEvent::KeyPress, key, Qt::NoModifier, commit_string[i]);
1016                         keyPressEvent(&ev);
1017                 }
1018         }
1019
1020         // Hide the cursor during the kana-kanji transformation.
1021         if (preedit_string.empty())
1022                 startBlinkingCursor();
1023         else
1024                 stopBlinkingCursor();
1025
1026         // last_width : for checking if last preedit string was/wasn't empty.
1027         static bool last_width = false;
1028         if (!last_width && preedit_string.empty()) {
1029                 // if last_width is last length of preedit string.
1030                 e->accept();
1031                 return;
1032         }
1033
1034         GuiPainter pain(&screen_);
1035         buffer_view_->updateMetrics();
1036         buffer_view_->draw(pain);
1037         FontInfo font = buffer_view_->cursor().getFont().fontInfo();
1038         FontMetrics const & fm = theFontMetrics(font);
1039         int height = fm.maxHeight();
1040         int cur_x = cursor_->rect().left();
1041         int cur_y = cursor_->rect().bottom();
1042
1043         // redraw area of preedit string.
1044         update(0, cur_y - height, viewport()->width(),
1045                 (height + 1) * preedit_lines_);
1046
1047         if (preedit_string.empty()) {
1048                 last_width = false;
1049                 preedit_lines_ = 1;
1050                 e->accept();
1051                 return;
1052         }
1053         last_width = true;
1054
1055         // att : stores an IM attribute.
1056         QList<QInputMethodEvent::Attribute> const & att = e->attributes();
1057
1058         // get attributes of input method cursor.
1059         // cursor_pos : cursor position in preedit string.
1060         size_t cursor_pos = 0;
1061         bool cursor_is_visible = false;
1062         for (int i = 0; i != att.size(); ++i) {
1063                 if (att.at(i).type == QInputMethodEvent::Cursor) {
1064                         cursor_pos = att.at(i).start;
1065                         cursor_is_visible = att.at(i).length != 0;
1066                         break;
1067                 }
1068         }
1069
1070         size_t preedit_length = preedit_string.length();
1071
1072         // get position of selection in input method.
1073         // FIXME: isn't there a way to do this simplier?
1074         // rStart : cursor position in selected string in IM.
1075         size_t rStart = 0;
1076         // rLength : selected string length in IM.
1077         size_t rLength = 0;
1078         if (cursor_pos < preedit_length) {
1079                 for (int i = 0; i != att.size(); ++i) {
1080                         if (att.at(i).type == QInputMethodEvent::TextFormat) {
1081                                 if (att.at(i).start <= int(cursor_pos)
1082                                         && int(cursor_pos) < att.at(i).start + att.at(i).length) {
1083                                                 rStart = att.at(i).start;
1084                                                 rLength = att.at(i).length;
1085                                                 if (!cursor_is_visible)
1086                                                         cursor_pos += rLength;
1087                                                 break;
1088                                 }
1089                         }
1090                 }
1091         }
1092         else {
1093                 rStart = cursor_pos;
1094                 rLength = 0;
1095         }
1096
1097         int const right_margin = buffer_view_->rightMargin();
1098         Painter::preedit_style ps;
1099         // Most often there would be only one line:
1100         preedit_lines_ = 1;
1101         for (size_t pos = 0; pos != preedit_length; ++pos) {
1102                 char_type const typed_char = preedit_string[pos];
1103                 // reset preedit string style
1104                 ps = Painter::preedit_default;
1105
1106                 // if we reached the right extremity of the screen, go to next line.
1107                 if (cur_x + fm.width(typed_char) > viewport()->width() - right_margin) {
1108                         cur_x = right_margin;
1109                         cur_y += height + 1;
1110                         ++preedit_lines_;
1111                 }
1112                 // preedit strings are displayed with dashed underline
1113                 // and partial strings are displayed white on black indicating
1114                 // that we are in selecting mode in the input method.
1115                 // FIXME: rLength == preedit_length is not a changing condition
1116                 // FIXME: should be put out of the loop.
1117                 if (pos >= rStart
1118                         && pos < rStart + rLength
1119                         && !(cursor_pos < rLength && rLength == preedit_length))
1120                         ps = Painter::preedit_selecting;
1121
1122                 if (pos == cursor_pos
1123                         && (cursor_pos < rLength && rLength == preedit_length))
1124                         ps = Painter::preedit_cursor;
1125
1126                 // draw one character and update cur_x.
1127                 cur_x += pain.preeditText(cur_x, cur_y, typed_char, font, ps);
1128         }
1129
1130         // update the preedit string screen area.
1131         update(0, cur_y - preedit_lines_*height, viewport()->width(),
1132                 (height + 1) * preedit_lines_);
1133
1134         // Don't forget to accept the event!
1135         e->accept();
1136 }
1137
1138
1139 QVariant GuiWorkArea::inputMethodQuery(Qt::InputMethodQuery query) const
1140 {
1141         QRect cur_r(0, 0, 0, 0);
1142         switch (query) {
1143                 // this is the CJK-specific composition window position.
1144                 case Qt::ImMicroFocus:
1145                         cur_r = cursor_->rect();
1146                         if (preedit_lines_ != 1)
1147                                 cur_r.moveLeft(10);
1148                         cur_r.moveBottom(cur_r.bottom() + cur_r.height() * preedit_lines_);
1149                         // return lower right of cursor in LyX.
1150                         return cur_r;
1151                 default:
1152                         return QWidget::inputMethodQuery(query);
1153         }
1154 }
1155
1156
1157 void GuiWorkArea::updateWindowTitle()
1158 {
1159         docstring maximize_title;
1160         docstring minimize_title;
1161
1162         Buffer & buf = buffer_view_->buffer();
1163         FileName const fileName = buf.fileName();
1164         if (!fileName.empty()) {
1165                 maximize_title = fileName.displayName(30);
1166                 minimize_title = from_utf8(fileName.onlyFileName());
1167                 if (buf.lyxvc().inUse()) {
1168                         if (buf.lyxvc().locker().empty())
1169                                 maximize_title +=  _(" (version control)");
1170                         else
1171                                 maximize_title +=  _(" (version control, locking)");
1172                 }
1173                 if (!buf.isClean()) {
1174                         maximize_title += _(" (changed)");
1175                         minimize_title += char_type('*');
1176                 }
1177                 if (buf.isReadonly())
1178                         maximize_title += _(" (read only)");
1179         }
1180
1181         QString title = windowTitle();
1182         QString new_title = toqstr(maximize_title);
1183         if (title == new_title)
1184                 return;
1185
1186         QWidget::setWindowTitle(new_title);
1187         QWidget::setWindowIconText(toqstr(minimize_title));
1188         titleChanged(this);
1189 }
1190
1191
1192 void GuiWorkArea::setReadOnly(bool)
1193 {
1194         updateWindowTitle();
1195         if (this == lyx_view_->currentWorkArea())
1196                 lyx_view_->updateDialogs();
1197 }
1198
1199
1200 bool GuiWorkArea::isFullScreen()
1201 {
1202         return lyx_view_ && lyx_view_->isFullScreen();
1203 }
1204
1205
1206 ////////////////////////////////////////////////////////////////////
1207 //
1208 // EmbeddedWorkArea
1209 //
1210 ////////////////////////////////////////////////////////////////////
1211
1212
1213 EmbeddedWorkArea::EmbeddedWorkArea(QWidget * w): GuiWorkArea(w)
1214 {
1215         buffer_ = theBufferList().newBuffer(
1216                 support::FileName::tempName().absFilename() + "_embedded.internal");
1217         buffer_->setUnnamed(true);
1218         buffer_->setFullyLoaded(true);
1219         setBuffer(*buffer_);
1220         setDialogMode(true);
1221 }
1222
1223
1224 EmbeddedWorkArea::~EmbeddedWorkArea()
1225 {
1226         // No need to destroy buffer and bufferview here, because it is done
1227         // in theBuffeerList() destruction loop at application exit
1228 }
1229
1230
1231 void EmbeddedWorkArea::closeEvent(QCloseEvent * ev)
1232 {
1233         disable();
1234         GuiWorkArea::closeEvent(ev);
1235 }
1236
1237
1238 void EmbeddedWorkArea::hideEvent(QHideEvent * ev)
1239 {
1240         disable();
1241         GuiWorkArea::hideEvent(ev);
1242 }
1243
1244
1245 void EmbeddedWorkArea::disable()
1246 {
1247         stopBlinkingCursor();
1248         if (view().currentWorkArea() != this)
1249                 return;
1250         LASSERT(view().currentMainWorkArea(), /* */);
1251         view().setCurrentWorkArea(view().currentMainWorkArea());
1252 }
1253
1254 ////////////////////////////////////////////////////////////////////
1255 //
1256 // TabWorkArea
1257 //
1258 ////////////////////////////////////////////////////////////////////
1259
1260 #ifdef Q_WS_MACX
1261 class NoTabFrameMacStyle : public QMacStyle {
1262 public:
1263         ///
1264         QRect subElementRect(SubElement element, const QStyleOption * option,
1265                              const QWidget * widget = 0) const
1266         {
1267                 QRect rect = QMacStyle::subElementRect(element, option, widget);
1268                 bool noBar = static_cast<QTabWidget const *>(widget)->count() <= 1;
1269
1270                 // The Qt Mac style puts the contents into a 3 pixel wide box
1271                 // which looks very ugly and not like other Mac applications.
1272                 // Hence we remove this here, and moreover the 16 pixel round
1273                 // frame above if the tab bar is hidden.
1274                 if (element == QStyle::SE_TabWidgetTabContents) {
1275                         rect.adjust(- rect.left(), 0, rect.left(), 0);
1276                         if (noBar)
1277                                 rect.setTop(0);
1278                 }
1279
1280                 return rect;
1281         }
1282 };
1283
1284 NoTabFrameMacStyle noTabFrameMacStyle;
1285 #endif
1286
1287
1288 TabWorkArea::TabWorkArea(QWidget * parent)
1289         : QTabWidget(parent), clicked_tab_(-1)
1290 {
1291 #ifdef Q_WS_MACX
1292         setStyle(&noTabFrameMacStyle);
1293 #endif
1294
1295         QPalette pal = palette();
1296         pal.setColor(QPalette::Active, QPalette::Button,
1297                 pal.color(QPalette::Active, QPalette::Window));
1298         pal.setColor(QPalette::Disabled, QPalette::Button,
1299                 pal.color(QPalette::Disabled, QPalette::Window));
1300         pal.setColor(QPalette::Inactive, QPalette::Button,
1301                 pal.color(QPalette::Inactive, QPalette::Window));
1302
1303         QObject::connect(this, SIGNAL(currentChanged(int)),
1304                 this, SLOT(on_currentTabChanged(int)));
1305
1306         closeBufferButton = new QToolButton(this);
1307         closeBufferButton->setPalette(pal);
1308         // FIXME: rename the icon to closebuffer.png
1309         closeBufferButton->setIcon(QIcon(getPixmap("images/", "closetab", "png")));
1310         closeBufferButton->setText("Close File");
1311         closeBufferButton->setAutoRaise(true);
1312         closeBufferButton->setCursor(Qt::ArrowCursor);
1313         closeBufferButton->setToolTip(qt_("Close File"));
1314         closeBufferButton->setEnabled(true);
1315         QObject::connect(closeBufferButton, SIGNAL(clicked()),
1316                 this, SLOT(closeCurrentBuffer()));
1317         setCornerWidget(closeBufferButton, Qt::TopRightCorner);
1318
1319         // setup drag'n'drop
1320         QTabBar* tb = new DragTabBar;
1321         connect(tb, SIGNAL(tabMoveRequested(int, int)),
1322                 this, SLOT(moveTab(int, int)));
1323         tb->setElideMode(Qt::ElideNone);
1324         setTabBar(tb);
1325
1326         // make us responsible for the context menu of the tabbar
1327         tb->setContextMenuPolicy(Qt::CustomContextMenu);
1328         connect(tb, SIGNAL(customContextMenuRequested(const QPoint &)),
1329                 this, SLOT(showContextMenu(const QPoint &)));
1330
1331         setUsesScrollButtons(true);
1332 }
1333
1334
1335 void TabWorkArea::setFullScreen(bool full_screen)
1336 {
1337         for (int i = 0; i != count(); ++i) {
1338                 if (GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i)))
1339                         wa->setFullScreen(full_screen);
1340         }
1341
1342         if (lyxrc.full_screen_tabbar)
1343                 showBar(!full_screen && count()>1);
1344 }
1345
1346
1347 void TabWorkArea::showBar(bool show)
1348 {
1349         tabBar()->setEnabled(show);
1350         tabBar()->setVisible(show);
1351         closeBufferButton->setVisible(show);
1352 }
1353
1354
1355 GuiWorkArea * TabWorkArea::currentWorkArea()
1356 {
1357         if (count() == 0)
1358                 return 0;
1359
1360         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(currentWidget());
1361         LASSERT(wa, /**/);
1362         return wa;
1363 }
1364
1365
1366 GuiWorkArea * TabWorkArea::workArea(Buffer & buffer)
1367 {
1368         for (int i = 0; i != count(); ++i) {
1369                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i));
1370                 LASSERT(wa, return 0);
1371                 if (&wa->bufferView().buffer() == &buffer)
1372                         return wa;
1373         }
1374         return 0;
1375 }
1376
1377
1378 void TabWorkArea::closeAll()
1379 {
1380         while (count()) {
1381                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(0));
1382                 LASSERT(wa, /**/);
1383                 removeTab(0);
1384                 delete wa;
1385         }
1386 }
1387
1388
1389 bool TabWorkArea::setCurrentWorkArea(GuiWorkArea * work_area)
1390 {
1391         LASSERT(work_area, /**/);
1392         int index = indexOf(work_area);
1393         if (index == -1)
1394                 return false;
1395
1396         if (index == currentIndex())
1397                 // Make sure the work area is up to date.
1398                 on_currentTabChanged(index);
1399         else
1400                 // Switch to the work area.
1401                 setCurrentIndex(index);
1402         work_area->setFocus();
1403
1404         return true;
1405 }
1406
1407
1408 GuiWorkArea * TabWorkArea::addWorkArea(Buffer & buffer, GuiView & view)
1409 {
1410         GuiWorkArea * wa = new GuiWorkArea(buffer, view);
1411         wa->setUpdatesEnabled(false);
1412         // Hide tabbar if there's no tab (avoid a resize and a flashing tabbar
1413         // when hiding it again below).
1414         if (!(currentWorkArea() && currentWorkArea()->isFullScreen()))
1415                 showBar(count() > 0);
1416         addTab(wa, wa->windowTitle());
1417         QObject::connect(wa, SIGNAL(titleChanged(GuiWorkArea *)),
1418                 this, SLOT(updateTabTexts()));
1419         if (currentWorkArea() && currentWorkArea()->isFullScreen())
1420                 setFullScreen(true);
1421         else
1422                 // Hide tabbar if there's only one tab.
1423                 showBar(count() > 1);
1424
1425         updateTabTexts();
1426
1427         return wa;
1428 }
1429
1430
1431 bool TabWorkArea::removeWorkArea(GuiWorkArea * work_area)
1432 {
1433         LASSERT(work_area, return false);
1434         int index = indexOf(work_area);
1435         if (index == -1)
1436                 return false;
1437
1438         work_area->setUpdatesEnabled(false);
1439         removeTab(index);
1440         delete work_area;
1441
1442         if (count()) {
1443                 // make sure the next work area is enabled.
1444                 currentWidget()->setUpdatesEnabled(true);
1445                 if (currentWorkArea() && currentWorkArea()->isFullScreen())
1446                         setFullScreen(true);
1447                 else
1448                         // Hide tabbar if there's only one tab.
1449                         showBar(count() > 1);
1450         } else {
1451                 lastWorkAreaRemoved();
1452         }
1453
1454         updateTabTexts();
1455
1456         return true;
1457 }
1458
1459
1460 void TabWorkArea::on_currentTabChanged(int i)
1461 {
1462         // returns e.g. on application destruction
1463         if (i == -1)
1464                 return;
1465         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i));
1466         LASSERT(wa, return);
1467         BufferView & bv = wa->bufferView();
1468         bv.cursor().fixIfBroken();
1469         bv.updateMetrics();
1470         wa->setUpdatesEnabled(true);
1471         wa->redraw();
1472         wa->setFocus();
1473         ///
1474         currentWorkAreaChanged(wa);
1475
1476         LYXERR(Debug::GUI, "currentTabChanged " << i
1477                 << "File" << bv.buffer().absFileName());
1478 }
1479
1480
1481 void TabWorkArea::closeCurrentBuffer()
1482 {
1483         if (clicked_tab_ != -1)
1484                 setCurrentIndex(clicked_tab_);
1485         else
1486                 // Before dispatching the LFUN we should be sure this
1487                 // is the current workarea.
1488                 currentWorkAreaChanged(currentWorkArea());
1489
1490         lyx::dispatch(FuncRequest(LFUN_BUFFER_CLOSE));
1491 }
1492
1493
1494 void TabWorkArea::closeCurrentTab()
1495 {
1496         if (clicked_tab_ == -1)
1497                 removeWorkArea(currentWorkArea());
1498         else {
1499                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(clicked_tab_));
1500                 LASSERT(wa, /**/);
1501                 removeWorkArea(wa);
1502         }
1503 }
1504
1505 ///
1506 class DisplayPath {
1507 public:
1508         /// make vector happy
1509         DisplayPath() {}
1510         ///
1511         DisplayPath(int tab, FileName const & filename)
1512                 : tab_(tab)
1513         {
1514                 filename_ = toqstr(filename.onlyFileNameWithoutExt());
1515                 postfix_ = toqstr(filename.absoluteFilePath()).
1516                         split("/", QString::SkipEmptyParts);
1517                 postfix_.pop_back();
1518                 abs_ = toqstr(filename.absoluteFilePath());
1519                 dottedPrefix_ = false;
1520         }
1521
1522         /// Absolute path for debugging.
1523         QString abs() const
1524         {
1525                 return abs_;
1526         }
1527         /// Add the first segment from the postfix or three dots to the prefix.
1528         /// Merge multiple dot tripples. In fact dots are added lazily, i.e. only
1529         /// when really needed.
1530         void shiftPathSegment(bool dotted)
1531         {
1532                 if (postfix_.count() <= 0)
1533                         return;
1534
1535                 if (!dotted) {
1536                         if (dottedPrefix_ && !prefix_.isEmpty())
1537                                 prefix_ += ".../";
1538                         prefix_ += postfix_.front() + "/";
1539                 }
1540                 dottedPrefix_ = dotted && !prefix_.isEmpty();
1541                 postfix_.pop_front();
1542         }
1543         ///
1544         QString displayString() const
1545         {
1546                 if (prefix_.isEmpty())
1547                         return filename_;
1548
1549                 bool dots = dottedPrefix_ || !postfix_.isEmpty();
1550                 return prefix_ + (dots ? ".../" : "") + filename_;
1551         }
1552         ///
1553         QString forecastPathString() const
1554         {
1555                 if (postfix_.count() == 0)
1556                         return displayString();
1557
1558                 return prefix_
1559                         + (dottedPrefix_ ? ".../" : "")
1560                         + postfix_.front() + "/";
1561         }
1562         ///
1563         bool final() const { return postfix_.empty(); }
1564         ///
1565         int tab() const { return tab_; }
1566
1567 private:
1568         ///
1569         QString prefix_;
1570         ///
1571         QStringList postfix_;
1572         ///
1573         QString filename_;
1574         ///
1575         QString abs_;
1576         ///
1577         int tab_;
1578         ///
1579         bool dottedPrefix_;
1580 };
1581
1582
1583 ///
1584 bool operator<(DisplayPath const & a, DisplayPath const & b)
1585 {
1586         return a.displayString() < b.displayString();
1587 }
1588
1589 ///
1590 bool operator==(DisplayPath const & a, DisplayPath const & b)
1591 {
1592         return a.displayString() == b.displayString();
1593 }
1594
1595
1596 void TabWorkArea::updateTabTexts()
1597 {
1598         size_t n = count();
1599         if (n == 0)
1600                 return;
1601         std::list<DisplayPath> paths;
1602         typedef std::list<DisplayPath>::iterator It;
1603
1604         // collect full names first: path into postfix, empty prefix and
1605         // filename without extension
1606         for (size_t i = 0; i < n; ++i) {
1607                 GuiWorkArea * i_wa = dynamic_cast<GuiWorkArea *>(widget(i));
1608                 FileName const fn = i_wa->bufferView().buffer().fileName();
1609                 paths.push_back(DisplayPath(i, fn));
1610         }
1611
1612         // go through path segments and see if it helps to make the path more unique
1613         bool somethingChanged = true;
1614         bool allFinal = false;
1615         while (somethingChanged && !allFinal) {
1616                 // adding path segments changes order
1617                 paths.sort();
1618
1619                 LYXERR(Debug::GUI, "updateTabTexts() iteration start");
1620                 somethingChanged = false;
1621                 allFinal = true;
1622
1623                 // find segments which are not unique (i.e. non-atomic)
1624                 It it = paths.begin();
1625                 It segStart = it;
1626                 QString segString = it->displayString();
1627                 for (; it != paths.end(); ++it) {
1628                         // look to the next item
1629                         It next = it;
1630                         ++next;
1631
1632                         // final?
1633                         allFinal = allFinal && it->final();
1634
1635                         LYXERR(Debug::GUI, "it = " << it->abs()
1636                                << " => " << it->displayString());
1637
1638                         // still the same segment?
1639                         QString nextString;
1640                         if ((next != paths.end()
1641                              && (nextString = next->displayString()) == segString))
1642                                 continue;
1643                         LYXERR(Debug::GUI, "segment ended");
1644
1645                         // only a trivial one with one element?
1646                         if (it == segStart) {
1647                                 // start new segment
1648                                 segStart = next;
1649                                 segString = nextString;
1650                                 continue;
1651                         }
1652
1653                         // we found a non-atomic segment segStart <= sit <= it < next.
1654                         // Shift path segments and hope for the best
1655                         // that it makes the path more unique.
1656                         somethingChanged = true;
1657                         It sit = segStart;
1658                         QString dspString = sit->forecastPathString();
1659                         LYXERR(Debug::GUI, "first forecast found for "
1660                                << sit->abs() << " => " << dspString);
1661                         ++sit;
1662                         bool moreUnique = false;
1663                         for (; sit != next; ++sit) {
1664                                 if (sit->forecastPathString() != dspString) {
1665                                         LYXERR(Debug::GUI, "different forecast found for "
1666                                                 << sit->abs() << " => " << sit->forecastPathString());
1667                                         moreUnique = true;
1668                                         break;
1669                                 }
1670                                 LYXERR(Debug::GUI, "same forecast found for "
1671                                         << sit->abs() << " => " << dspString);
1672                         }
1673
1674                         // if the path segment helped, add it. Otherwise add dots
1675                         bool dots = !moreUnique;
1676                         LYXERR(Debug::GUI, "using dots = " << dots);
1677                         for (sit = segStart; sit != next; ++sit) {
1678                                 sit->shiftPathSegment(dots);
1679                                 LYXERR(Debug::GUI, "shifting "
1680                                         << sit->abs() << " => " << sit->displayString());
1681                         }
1682
1683                         // start new segment
1684                         segStart = next;
1685                         segString = nextString;
1686                 }
1687         }
1688
1689         // set new tab titles
1690         for (It it = paths.begin(); it != paths.end(); ++it) {
1691                 GuiWorkArea * i_wa = dynamic_cast<GuiWorkArea *>(widget(it->tab()));
1692                 Buffer & buf = i_wa->bufferView().buffer();
1693                 if (!buf.fileName().empty() && !buf.isClean())
1694                         setTabText(it->tab(), it->displayString() + "*");
1695                 else
1696                         setTabText(it->tab(), it->displayString());
1697         }
1698 }
1699
1700
1701 void TabWorkArea::showContextMenu(const QPoint & pos)
1702 {
1703         // which tab?
1704         clicked_tab_ = static_cast<DragTabBar *>(tabBar())->tabAt(pos);
1705         if (clicked_tab_ == -1)
1706                 return;
1707
1708         // show tab popup
1709         QMenu popup;
1710         popup.addAction(QIcon(getPixmap("images/", "hidetab", "png")),
1711                 qt_("Hide tab"), this, SLOT(closeCurrentTab()));
1712         popup.addAction(QIcon(getPixmap("images/", "closetab", "png")),
1713                 qt_("Close tab"), this, SLOT(closeCurrentBuffer()));
1714         popup.exec(tabBar()->mapToGlobal(pos));
1715
1716         clicked_tab_ = -1;
1717 }
1718
1719
1720 void TabWorkArea::moveTab(int fromIndex, int toIndex)
1721 {
1722         QWidget * w = widget(fromIndex);
1723         QIcon icon = tabIcon(fromIndex);
1724         QString text = tabText(fromIndex);
1725
1726         setCurrentIndex(fromIndex);
1727         removeTab(fromIndex);
1728         insertTab(toIndex, w, icon, text);
1729         setCurrentIndex(toIndex);
1730 }
1731
1732
1733 DragTabBar::DragTabBar(QWidget* parent)
1734         : QTabBar(parent)
1735 {
1736         setAcceptDrops(true);
1737 }
1738
1739
1740 #if QT_VERSION < 0x040300
1741 int DragTabBar::tabAt(QPoint const & position) const
1742 {
1743         const int max = count();
1744         for (int i = 0; i < max; ++i) {
1745                 if (tabRect(i).contains(position))
1746                         return i;
1747         }
1748         return -1;
1749 }
1750 #endif
1751
1752
1753 void DragTabBar::mousePressEvent(QMouseEvent * event)
1754 {
1755         if (event->button() == Qt::LeftButton)
1756                 dragStartPos_ = event->pos();
1757         QTabBar::mousePressEvent(event);
1758 }
1759
1760
1761 void DragTabBar::mouseMoveEvent(QMouseEvent * event)
1762 {
1763         // If the left button isn't pressed anymore then return
1764         if (!(event->buttons() & Qt::LeftButton))
1765                 return;
1766
1767         // If the distance is too small then return
1768         if ((event->pos() - dragStartPos_).manhattanLength()
1769             < QApplication::startDragDistance())
1770                 return;
1771
1772         // did we hit something after all?
1773         int tab = tabAt(dragStartPos_);
1774         if (tab == -1)
1775                 return;
1776
1777         // simulate button release to remove highlight from button
1778         int i = currentIndex();
1779         QMouseEvent me(QEvent::MouseButtonRelease, dragStartPos_,
1780                 event->button(), event->buttons(), 0);
1781         QTabBar::mouseReleaseEvent(&me);
1782         setCurrentIndex(i);
1783
1784         // initiate Drag
1785         QDrag * drag = new QDrag(this);
1786         QMimeData * mimeData = new QMimeData;
1787         // a crude way to distinguish tab-reodering drops from other ones
1788         mimeData->setData("action", "tab-reordering") ;
1789         drag->setMimeData(mimeData);
1790
1791 #if QT_VERSION >= 0x040300
1792         // get tab pixmap as cursor
1793         QRect r = tabRect(tab);
1794         QPixmap pixmap(r.size());
1795         render(&pixmap, - r.topLeft());
1796         drag->setPixmap(pixmap);
1797         drag->exec();
1798 #else
1799         drag->start(Qt::MoveAction);
1800 #endif
1801
1802 }
1803
1804
1805 void DragTabBar::dragEnterEvent(QDragEnterEvent * event)
1806 {
1807         // Only accept if it's an tab-reordering request
1808         QMimeData const * m = event->mimeData();
1809         QStringList formats = m->formats();
1810         if (formats.contains("action")
1811             && m->data("action") == "tab-reordering")
1812                 event->acceptProposedAction();
1813 }
1814
1815
1816 void DragTabBar::dropEvent(QDropEvent * event)
1817 {
1818         int fromIndex = tabAt(dragStartPos_);
1819         int toIndex = tabAt(event->pos());
1820
1821         // Tell interested objects that
1822         if (fromIndex != toIndex)
1823                 tabMoveRequested(fromIndex, toIndex);
1824         event->acceptProposedAction();
1825 }
1826
1827
1828 } // namespace frontend
1829 } // namespace lyx
1830
1831 #include "moc_GuiWorkArea.cpp"