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/debug.h"
  47 #include "support/gettext.h"
  48 #include "support/FileName.h"
  49
  50 #include "frontends/Application.h"
  51 #include "frontends/FontMetrics.h"
  52 #include "frontends/WorkAreaManager.h"
  53
  54 #include <QContextMenuEvent>
  55 #include <QInputContext>
  56 #include <QHelpEvent>
  57 #ifdef Q_WS_MACX
  58 #include <QMacStyle>
  59 #endif
  60 #include <QMainWindow>
  61 #include <QMenu>
  62 #include <QPainter>
  63 #include <QPalette>
  64 #include <QPixmapCache>
  65 #include <QScrollBar>
  66 #include <QTimer>
  67 #include <QToolButton>
  68 #include <QToolTip>
  69 #include <QMenuBar>
  70
  71 #include <boost/bind.hpp>
  72
  73 #include <cmath>
  74
  75 #ifdef Q_WS_X11
  76 #include <QX11Info>
  77 extern "C" int XEventsQueued(Display *display, int mode);
  78 #endif
  79
  80 #ifdef Q_WS_WIN
  81 int const CursorWidth = 2;
  82 #else
  83 int const CursorWidth = 1;
  84 #endif
  85 int const TabIndicatorWidth = 3;
  86
  87 #undef KeyPress
  88 #undef NoModifier
  89
  90 using namespace std;
  91 using namespace lyx::support;
  92
  93 namespace lyx {
  94
  95
  96 /// return the LyX mouse button state from Qt's
  97 static mouse_button::state q_button_state(Qt::MouseButton button)
  98 {
  99         mouse_button::state b = mouse_button::none;
 100         switch (button) {
 101                 case Qt::LeftButton:
 102                         b = mouse_button::button1;
 103                         break;
 104                 case Qt::MidButton:
 105                         b = mouse_button::button2;
 106                         break;
 107                 case Qt::RightButton:
 108                         b = mouse_button::button3;
 109                         break;
 110                 default:
 111                         break;
 112         }
 113         return b;
 114 }
 115
 116
 117 /// return the LyX mouse button state from Qt's
 118 mouse_button::state q_motion_state(Qt::MouseButtons state)
 119 {
 120         mouse_button::state b = mouse_button::none;
 121         if (state & Qt::LeftButton)
 122                 b |= mouse_button::button1;
 123         if (state & Qt::MidButton)
 124                 b |= mouse_button::button2;
 125         if (state & Qt::RightButton)
 126                 b |= mouse_button::button3;
 127         return b;
 128 }
 129
 130
 131 namespace frontend {
 132
 133 class CursorWidget {
 134 public:
 135         CursorWidget() {}
 136
 137         void draw(QPainter & painter)
 138         {
 139                 if (!show_ || !rect_.isValid())
 140                         return;
 141
 142                 int y = rect_.top();
 143                 int l = x_ - rect_.left();
 144                 int r = rect_.right() - x_;
 145                 int bot = rect_.bottom();
 146
 147                 // draw vertica linel
 148                 painter.fillRect(x_, y, CursorWidth, rect_.height(), color_);
 149
 150                 // draw RTL/LTR indication
 151                 painter.setPen(color_);
 152                 if (l_shape_) {
 153                         if (rtl_)
 154                                 painter.drawLine(x_, bot, x_ - l, bot);
 155                         else
 156                                 painter.drawLine(x_, bot, x_ + CursorWidth + r, bot);
 157                 }
 158
 159                 // draw completion triangle
 160                 if (completable_) {
 161                         int m = y + rect_.height() / 2;
 162                         int d = TabIndicatorWidth - 1;
 163                         if (rtl_) {
 164                                 painter.drawLine(x_ - 1, m - d, x_ - 1 - d, m);
 165                                 painter.drawLine(x_ - 1, m + d, x_ - 1 - d, m);
 166                         } else {
 167                                 painter.drawLine(x_ + CursorWidth, m - d, x_ + CursorWidth + d, m);
 168                                 painter.drawLine(x_ + CursorWidth, m + d, x_ + CursorWidth + d, m);
 169                         }
 170                 }
 171         }
 172
 173         void update(int x, int y, int h, bool l_shape,
 174                 bool rtl, bool completable)
 175         {
 176                 color_ = guiApp->colorCache().get(Color_cursor);
 177                 l_shape_ = l_shape;
 178                 rtl_ = rtl;
 179                 completable_ = completable;
 180                 x_ = x;
 181
 182                 // extension to left and right
 183                 int l = 0;
 184                 int r = 0;
 185
 186                 // RTL/LTR indication
 187                 if (l_shape_) {
 188                         if (rtl)
 189                                 l += h / 3;
 190                         else
 191                                 r += h / 3;
 192                 }
 193
 194                 // completion triangle
 195                 if (completable_) {
 196                         if (rtl)
 197                                 l = max(l, TabIndicatorWidth);
 198                         else
 199                                 r = max(r, TabIndicatorWidth);
 200                 }
 201
 202                 // compute overall rectangle
 203                 rect_ = QRect(x - l, y, CursorWidth + r + l, h);
 204         }
 205
 206         void show(bool set_show = true) { show_ = set_show; }
 207         void hide() { show_ = false; }
 208
 209         QRect const & rect() { return rect_; }
 210
 211 private:
 212         /// cursor is in RTL or LTR text
 213         bool rtl_;
 214         /// indication for RTL or LTR
 215         bool l_shape_;
 216         /// triangle to show that a completion is available
 217         bool completable_;
 218         ///
 219         bool show_;
 220         ///
 221         QColor color_;
 222         /// rectangle, possibly with l_shape and completion triangle
 223         QRect rect_;
 224         /// x position (were the vertical line is drawn)
 225         int x_;
 226 };
 227
 228
 229 // This is a 'heartbeat' generating synthetic mouse move events when the
 230 // cursor is at the top or bottom edge of the viewport. One scroll per 0.2 s
 231 SyntheticMouseEvent::SyntheticMouseEvent()
 232         : timeout(200), restart_timeout(true),
 233           x_old(-1), y_old(-1), scrollbar_value_old(-1.0)
 234 {}
 235
 236
 237 GuiWorkArea::GuiWorkArea(QWidget *)
 238         : buffer_view_(0), lyx_view_(0),
 239         cursor_visible_(false),
 240         need_resize_(false), schedule_redraw_(false),
 241         preedit_lines_(1), completer_(new GuiCompleter(this))
 242 {
 243 }
 244
 245
 246 GuiWorkArea::GuiWorkArea(Buffer & buffer, GuiView & gv)
 247         : buffer_view_(0), lyx_view_(0),
 248         cursor_visible_(false),
 249         need_resize_(false), schedule_redraw_(false),
 250         preedit_lines_(1), completer_(new GuiCompleter(this))
 251 {
 252         setGuiView(gv);
 253         setBuffer(buffer);
 254         init();
 255 }
 256
 257
 258 void GuiWorkArea::init()
 259 {
 260         // Setup the signals
 261         connect(&cursor_timeout_, SIGNAL(timeout()),
 262                 this, SLOT(toggleCursor()));
 263
 264         int const time = QApplication::cursorFlashTime() / 2;
 265         if (time > 0) {
 266                 cursor_timeout_.setInterval(time);
 267                 cursor_timeout_.start();
 268         } else {
 269                 // let's initialize this just to be safe
 270                 cursor_timeout_.setInterval(500);
 271         }
 272
 273         screen_ = QPixmap(viewport()->width(), viewport()->height());
 274         cursor_ = new frontend::CursorWidget();
 275         cursor_->hide();
 276
 277         setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 278         setAcceptDrops(true);
 279         setMouseTracking(true);
 280         setMinimumSize(100, 70);
 281         setFrameStyle(QFrame::NoFrame);
 282         updateWindowTitle();
 283
 284         viewport()->setAutoFillBackground(false);
 285         // We don't need double-buffering nor SystemBackground on
 286         // the viewport because we have our own backing pixmap.
 287         viewport()->setAttribute(Qt::WA_NoSystemBackground);
 288
 289         setFocusPolicy(Qt::StrongFocus);
 290
 291         viewport()->setCursor(Qt::IBeamCursor);
 292
 293         synthetic_mouse_event_.timeout.timeout.connect(
 294                 boost::bind(&GuiWorkArea::generateSyntheticMouseEvent,
 295                                         this));
 296
 297         // Initialize the vertical Scroll Bar
 298         QObject::connect(verticalScrollBar(), SIGNAL(valueChanged(int)),
 299                 this, SLOT(scrollTo(int)));
 300
 301         LYXERR(Debug::GUI, "viewport width: " << viewport()->width()
 302                 << "  viewport height: " << viewport()->height());
 303
 304         // Enables input methods for asian languages.
 305         // Must be set when creating custom text editing widgets.
 306         setAttribute(Qt::WA_InputMethodEnabled, true);
 307
 308         dialog_mode_ = false;
 309 }
 310
 311
 312 GuiWorkArea::~GuiWorkArea()
 313 {
 314         buffer_view_->buffer().workAreaManager().remove(this);
 315         delete buffer_view_;
 316         delete cursor_;
 317         // Completer has a QObject parent and is thus automatically destroyed.
 318         // delete completer_;
 319 }
 320
 321
 322 void GuiWorkArea::setGuiView(GuiView & gv)
 323 {
 324         lyx_view_ = &gv;
 325 }
 326
 327
 328 void GuiWorkArea::setBuffer(Buffer & buffer)
 329 {
 330         delete buffer_view_;
 331         buffer_view_ = new BufferView(buffer),
 332         buffer.workAreaManager().add(this);
 333
 334         // HACK: Prevents an additional redraw when the scrollbar pops up
 335         // which regularily happens on documents with more than one page.
 336         // The policy  should be set to "Qt::ScrollBarAsNeeded" soon.
 337         // Since we have no geometry information yet, we assume that
 338         // a document needs a scrollbar if there is more then four
 339         // paragraph in the outermost text.
 340         if (buffer.text().paragraphs().size() > 4)
 341                 setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
 342         QTimer::singleShot(50, this, SLOT(fixVerticalScrollBar()));
 343 }
 344
 345
 346 void GuiWorkArea::fixVerticalScrollBar()
 347 {
 348         if (!isFullScreen())
 349                 setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
 350 }
 351
 352
 353 void GuiWorkArea::close()
 354 {
 355         lyx_view_->removeWorkArea(this);
 356 }
 357
 358
 359 void GuiWorkArea::setFullScreen(bool full_screen)
 360 {
 361         buffer_view_->setFullScreen(full_screen);
 362         if (full_screen) {
 363                 setFrameStyle(QFrame::NoFrame);
 364                 if (lyxrc.full_screen_scrollbar)
 365                         setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 366         } else {
 367 #ifdef Q_WS_MACX
 368                 setFrameStyle(QFrame::NoFrame);
 369 #else
 370                 setFrameStyle(QFrame::Box);
 371 #endif
 372                 setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
 373         }
 374 }
 375
 376
 377 BufferView & GuiWorkArea::bufferView()
 378 {
 379         return *buffer_view_;
 380 }
 381
 382
 383 BufferView const & GuiWorkArea::bufferView() const
 384 {
 385         return *buffer_view_;
 386 }
 387
 388
 389 void GuiWorkArea::stopBlinkingCursor()
 390 {
 391         cursor_timeout_.stop();
 392         hideCursor();
 393 }
 394
 395
 396 void GuiWorkArea::startBlinkingCursor()
 397 {
 398         showCursor();
 399         //we're not supposed to cache this value.
 400         int const time = QApplication::cursorFlashTime() / 2;
 401         if (time <= 0)
 402                 return;
 403         cursor_timeout_.setInterval(time);
 404         cursor_timeout_.start();
 405 }
 406
 407
 408 void GuiWorkArea::redraw()
 409 {
 410         if (!isVisible())
 411                 // No need to redraw in this case.
 412                 return;
 413
 414         // No need to do anything if this is the current view. The BufferView
 415         // metrics are already up to date.
 416         if (lyx_view_ != guiApp->currentView()
 417                 || lyx_view_->currentWorkArea() != this) {
 418                 // FIXME: it would be nice to optimize for the off-screen case.
 419                 buffer_view_->updateMetrics();
 420                 buffer_view_->cursor().fixIfBroken();
 421         }
 422
 423         // update cursor position, because otherwise it has to wait until
 424         // the blinking interval is over
 425         if (cursor_visible_) {
 426                 hideCursor();
 427                 showCursor();
 428         }
 429
 430         LYXERR(Debug::WORKAREA, "WorkArea::redraw screen");
 431         updateScreen();
 432         update(0, 0, viewport()->width(), viewport()->height());
 433
 434         /// \warning: scrollbar updating *must* be done after the BufferView is drawn
 435         /// because \c BufferView::updateScrollbar() is called in \c BufferView::draw().
 436         updateScrollbar();
 437         lyx_view_->updateStatusBar();
 438
 439         if (lyxerr.debugging(Debug::WORKAREA))
 440                 buffer_view_->coordCache().dump();
 441 }
 442
 443
 444 void GuiWorkArea::processKeySym(KeySymbol const & key, KeyModifier mod)
 445 {
 446         if (lyx_view_->isFullScreen() && lyx_view_->menuBar()->isVisible()) {
 447                 // FIXME HACK: we should not have to do this here. See related comment
 448                 // in GuiView::event() (QEvent::ShortcutOverride)
 449                 lyx_view_->menuBar()->hide();
 450         }
 451
 452         // In order to avoid bad surprise in the middle of an operation,
 453         // we better stop the blinking cursor...
 454         // the cursor gets restarted in GuiView::restartCursor()
 455         stopBlinkingCursor();
 456
 457         theLyXFunc().setLyXView(lyx_view_);
 458         theLyXFunc().processKeySym(key, mod);
 459 }
 460
 461
 462 void GuiWorkArea::dispatch(FuncRequest const & cmd0, KeyModifier mod)
 463 {
 464         // Handle drag&drop
 465         if (cmd0.action == LFUN_FILE_OPEN) {
 466                 lyx_view_->dispatch(cmd0);
 467                 return;
 468         }
 469
 470         theLyXFunc().setLyXView(lyx_view_);
 471
 472         FuncRequest cmd;
 473
 474         if (cmd0.action == LFUN_MOUSE_PRESS) {
 475                 if (mod == ShiftModifier)
 476                         cmd = FuncRequest(cmd0, "region-select");
 477                 else if (mod == ControlModifier)
 478                         cmd = FuncRequest(cmd0, "paragraph-select");
 479                 else
 480                         cmd = cmd0;
 481         }
 482         else
 483                 cmd = cmd0;
 484
 485         bool const notJustMovingTheMouse =
 486                 cmd.action != LFUN_MOUSE_MOTION || cmd.button() != mouse_button::none;
 487
 488         // In order to avoid bad surprise in the middle of an operation, we better stop
 489         // the blinking cursor.
 490         if (notJustMovingTheMouse)
 491                 stopBlinkingCursor();
 492
 493         buffer_view_->mouseEventDispatch(cmd);
 494
 495         // Skip these when selecting
 496         if (cmd.action != LFUN_MOUSE_MOTION) {
 497                 completer_->updateVisibility(false, false);
 498                 lyx_view_->updateDialogs();
 499                 lyx_view_->updateStatusBar();
 500         }
 501
 502         // GUI tweaks except with mouse motion with no button pressed.
 503         if (notJustMovingTheMouse) {
 504                 // Slight hack: this is only called currently when we
 505                 // clicked somewhere, so we force through the display
 506                 // of the new status here.
 507                 lyx_view_->clearMessage();
 508
 509                 // Show the cursor immediately after any operation
 510                 startBlinkingCursor();
 511         }
 512 }
 513
 514
 515 void GuiWorkArea::resizeBufferView()
 516 {
 517         // WARNING: Please don't put any code that will trigger a repaint here!
 518         // We are already inside a paint event.
 519         lyx_view_->setBusy(true);
 520         Point p;
 521         int h = 0;
 522         buffer_view_->cursorPosAndHeight(p, h);
 523         bool const cursor_in_view = buffer_view_->cursorInView(p, h);
 524         buffer_view_->resize(viewport()->width(), viewport()->height());
 525         if (cursor_in_view)
 526                 buffer_view_->scrollToCursor();
 527         updateScreen();
 528
 529         // Update scrollbars which might have changed due different
 530         // BufferView dimension. This is especially important when the
 531         // BufferView goes from zero-size to the real-size for the first time,
 532         // as the scrollbar paramters are then set for the first time.
 533         updateScrollbar();
 534
 535         lyx_view_->updateLayoutList();
 536         lyx_view_->setBusy(false);
 537         need_resize_ = false;
 538 }
 539
 540
 541 void GuiWorkArea::showCursor()
 542 {
 543         if (cursor_visible_)
 544                 return;
 545
 546         // RTL or not RTL
 547         bool l_shape = false;
 548         Font const & realfont = buffer_view_->cursor().real_current_font;
 549         BufferParams const & bp = buffer_view_->buffer().params();
 550         bool const samelang = realfont.language() == bp.language;
 551         bool const isrtl = realfont.isVisibleRightToLeft();
 552
 553         if (!samelang || isrtl != bp.language->rightToLeft())
 554                 l_shape = true;
 555
 556         // The ERT language hack needs fixing up
 557         if (realfont.language() == latex_language)
 558                 l_shape = false;
 559
 560         Point p;
 561         int h = 0;
 562         buffer_view_->cursorPosAndHeight(p, h);
 563         // show cursor on screen
 564         Cursor & cur = buffer_view_->cursor();
 565         bool completable = cur.inset().showCompletionCursor()
 566                 && completer_->completionAvailable()
 567                 && !completer_->popupVisible()
 568                 && !completer_->inlineVisible();
 569         if (buffer_view_->cursorInView(p, h)) {
 570                 cursor_visible_ = true;
 571                 showCursor(p.x_, p.y_, h, l_shape, isrtl, completable);
 572         }
 573 }
 574
 575
 576 void GuiWorkArea::hideCursor()
 577 {
 578         if (!cursor_visible_)
 579                 return;
 580
 581         cursor_visible_ = false;
 582         removeCursor();
 583 }
 584
 585
 586 void GuiWorkArea::toggleCursor()
 587 {
 588         if (cursor_visible_)
 589                 hideCursor();
 590         else
 591                 showCursor();
 592 }
 593
 594
 595 void GuiWorkArea::updateScrollbar()
 596 {
 597         ScrollbarParameters const & scroll_ = buffer_view_->scrollbarParameters();
 598         // WARNING: don't touch at the scrollbar value like this:
 599         //   verticalScrollBar()->setValue(scroll_.position);
 600         // because this would cause a recursive signal/slot calling with
 601         // GuiWorkArea::scrollTo
 602         verticalScrollBar()->setRange(scroll_.min, scroll_.max);
 603         verticalScrollBar()->setPageStep(scroll_.page_step);
 604         verticalScrollBar()->setSingleStep(scroll_.single_step);
 605         verticalScrollBar()->setSliderPosition(scroll_.position);
 606 }
 607
 608
 609 void GuiWorkArea::scrollTo(int value)
 610 {
 611         stopBlinkingCursor();
 612         buffer_view_->scrollDocView(value);
 613
 614         if (lyxrc.cursor_follows_scrollbar) {
 615                 buffer_view_->setCursorFromScrollbar();
 616                 lyx_view_->updateLayoutList();
 617         }
 618         // Show the cursor immediately after any operation.
 619         startBlinkingCursor();
 620         QApplication::syncX();
 621 }
 622
 623
 624 bool GuiWorkArea::event(QEvent * e)
 625 {
 626         switch (e->type()) {
 627         case QEvent::ToolTip: {
 628                 QHelpEvent * helpEvent = static_cast<QHelpEvent *>(e);
 629                 if (lyxrc.use_tooltip) {
 630                         QPoint pos = helpEvent->pos();
 631                         if (pos.x() < viewport()->width()) {
 632                                 QString s = toqstr(buffer_view_->toolTip(pos.x(), pos.y()));
 633                                 QToolTip::showText(helpEvent->globalPos(), s);
 634                         }
 635                         else
 636                                 QToolTip::hideText();
 637                 }
 638                 // Don't forget to accept the event!
 639                 e->accept();
 640                 return true;
 641         }
 642
 643         case QEvent::ShortcutOverride: {
 644                 // We catch this event in order to catch the Tab or Shift+Tab key press
 645                 // which are otherwise reserved to focus switching between controls
 646                 // within a dialog.
 647                 QKeyEvent * ke = static_cast<QKeyEvent*>(e);
 648                 if ((ke->key() != Qt::Key_Tab && ke->key() != Qt::Key_Backtab)
 649                         || ke->modifiers() & Qt::ControlModifier)
 650                         return QAbstractScrollArea::event(e);
 651                 keyPressEvent(ke);
 652                 return true;
 653         }
 654
 655         default:
 656                 return QAbstractScrollArea::event(e);
 657         }
 658         return false;
 659 }
 660
 661
 662 void GuiWorkArea::contextMenuEvent(QContextMenuEvent * e)
 663 {
 664         QPoint pos = e->pos();
 665         docstring name = buffer_view_->contextMenu(pos.x(), pos.y());
 666         if (name.empty()) {
 667                 QAbstractScrollArea::contextMenuEvent(e);
 668                 return;
 669         }
 670         QMenu * menu = guiApp->menus().menu(toqstr(name), *lyx_view_);
 671         if (!menu) {
 672                 QAbstractScrollArea::contextMenuEvent(e);
 673                 return;
 674         }
 675         // Position the menu to the right.
 676         // FIXME: menu position should be different for RTL text.
 677         menu->exec(e->globalPos());
 678         e->accept();
 679 }
 680
 681
 682 void GuiWorkArea::focusInEvent(QFocusEvent * e)
 683 {
 684         /*
 685         LYXERR(Debug::DEBUG, "GuiWorkArea::focusInEvent(): " << this << std::endl);
 686         GuiWorkArea * old_gwa = theGuiApp()->currentView()->currentWorkArea();
 687         if (old_gwa)
 688                 old_gwa->stopBlinkingCursor();
 689         lyx_view_->setCurrentWorkArea(this);
 690         */
 691
 692         if (lyx_view_->currentWorkArea() != this)
 693                 lyx_view_->setCurrentWorkArea(this);
 694
 695         startBlinkingCursor();
 696         QAbstractScrollArea::focusInEvent(e);
 697 }
 698
 699
 700 void GuiWorkArea::focusOutEvent(QFocusEvent * e)
 701 {
 702         LYXERR(Debug::DEBUG, "GuiWorkArea::focusOutEvent(): " << this << std::endl);
 703         stopBlinkingCursor();
 704         QAbstractScrollArea::focusOutEvent(e);
 705 }
 706
 707
 708 void GuiWorkArea::mousePressEvent(QMouseEvent * e)
 709 {
 710         if (dc_event_.active && dc_event_ == *e) {
 711                 dc_event_.active = false;
 712                 FuncRequest cmd(LFUN_MOUSE_TRIPLE, e->x(), e->y(),
 713                         q_button_state(e->button()));
 714                 dispatch(cmd);
 715                 e->accept();
 716                 return;
 717         }
 718
 719         inputContext()->reset();
 720
 721         FuncRequest const cmd(LFUN_MOUSE_PRESS, e->x(), e->y(),
 722                 q_button_state(e->button()));
 723         dispatch(cmd, q_key_state(e->modifiers()));
 724         e->accept();
 725 }
 726
 727
 728 void GuiWorkArea::mouseReleaseEvent(QMouseEvent * e)
 729 {
 730         if (synthetic_mouse_event_.timeout.running())
 731                 synthetic_mouse_event_.timeout.stop();
 732
 733         FuncRequest const cmd(LFUN_MOUSE_RELEASE, e->x(), e->y(),
 734                               q_button_state(e->button()));
 735         dispatch(cmd);
 736         e->accept();
 737 }
 738
 739
 740 void GuiWorkArea::mouseMoveEvent(QMouseEvent * e)
 741 {
 742         // we kill the triple click if we move
 743         doubleClickTimeout();
 744         FuncRequest cmd(LFUN_MOUSE_MOTION, e->x(), e->y(),
 745                 q_motion_state(e->buttons()));
 746
 747         e->accept();
 748
 749         // If we're above or below the work area...
 750         if (e->y() <= 20 || e->y() >= viewport()->height() - 20) {
 751                 // Make sure only a synthetic event can cause a page scroll,
 752                 // so they come at a steady rate:
 753                 if (e->y() <= 20)
 754                         // _Force_ a scroll up:
 755                         cmd.y = -40;
 756                 else
 757                         cmd.y = viewport()->height();
 758                 // Store the event, to be handled when the timeout expires.
 759                 synthetic_mouse_event_.cmd = cmd;
 760
 761                 if (synthetic_mouse_event_.timeout.running())
 762                         // Discard the event. Note that it _may_ be handled
 763                         // when the timeout expires if
 764                         // synthetic_mouse_event_.cmd has not been overwritten.
 765                         // Ie, when the timeout expires, we handle the
 766                         // most recent event but discard all others that
 767                         // occurred after the one used to start the timeout
 768                         // in the first place.
 769                         return;
 770
 771                 synthetic_mouse_event_.restart_timeout = true;
 772                 synthetic_mouse_event_.timeout.start();
 773                 // Fall through to handle this event...
 774
 775         } else if (synthetic_mouse_event_.timeout.running()) {
 776                 // Store the event, to be possibly handled when the timeout
 777                 // expires.
 778                 // Once the timeout has expired, normal control is returned
 779                 // to mouseMoveEvent (restart_timeout = false).
 780                 // This results in a much smoother 'feel' when moving the
 781                 // mouse back into the work area.
 782                 synthetic_mouse_event_.cmd = cmd;
 783                 synthetic_mouse_event_.restart_timeout = false;
 784                 return;
 785         }
 786
 787         // Has anything changed on-screen since the last QMouseEvent
 788         // was received?
 789         double const scrollbar_value = verticalScrollBar()->value();
 790         if (e->x() == synthetic_mouse_event_.x_old
 791                 && e->y() == synthetic_mouse_event_.y_old
 792                 && scrollbar_value == synthetic_mouse_event_.scrollbar_value_old) {
 793                 // Nothing changed on-screen since the last QMouseEvent.
 794                 return;
 795         }
 796
 797         // Yes something has changed. Store the params used to check this.
 798         synthetic_mouse_event_.x_old = e->x();
 799         synthetic_mouse_event_.y_old = e->y();
 800         synthetic_mouse_event_.scrollbar_value_old = scrollbar_value;
 801
 802         // ... and dispatch the event to the LyX core.
 803         dispatch(cmd);
 804 }
 805
 806
 807 void GuiWorkArea::wheelEvent(QWheelEvent * ev)
 808 {
 809         // Wheel rotation by one notch results in a delta() of 120 (see
 810         // documentation of QWheelEvent)
 811         int const delta = ev->delta() / 120;
 812         if (ev->modifiers() & Qt::ControlModifier) {
 813                 lyxrc.zoom += 5 * delta;
 814                 if (lyxrc.zoom < 10)
 815                         lyxrc.zoom = 10;
 816                 // The global QPixmapCache is used in GuiPainter to cache text
 817                 // painting so we must reset it.
 818                 QPixmapCache::clear();
 819                 guiApp->fontLoader().update();
 820                 ev->accept();
 821                 lyx::dispatch(FuncRequest(LFUN_SCREEN_FONT_UPDATE));
 822                 return;
 823         }
 824
 825         // Take into account the desktop wide settings.
 826         int const lines = qApp->wheelScrollLines();
 827         int const page_step = verticalScrollBar()->pageStep();
 828         // Test if the wheel mouse is set to one screen at a time.
 829         int scroll_value = lines > page_step
 830                 ? page_step : lines * verticalScrollBar()->singleStep();
 831
 832         // Take into account the rotation.
 833         scroll_value *= delta;
 834
 835         // Take into account user preference.
 836         scroll_value *= lyxrc.mouse_wheel_speed;
 837         LYXERR(Debug::SCROLLING, "wheelScrollLines = " << lines
 838                         << " delta = " << delta << " scroll_value = " << scroll_value
 839                         << " page_step = " << page_step);
 840         // Now scroll.
 841         verticalScrollBar()->setValue(verticalScrollBar()->value() - scroll_value);
 842
 843         ev->accept();
 844 }
 845
 846
 847 void GuiWorkArea::generateSyntheticMouseEvent()
 848 {
 849         // Set things off to generate the _next_ 'pseudo' event.
 850         if (synthetic_mouse_event_.restart_timeout)
 851                 synthetic_mouse_event_.timeout.start();
 852
 853         // Has anything changed on-screen since the last timeout signal
 854         // was received?
 855         double const scrollbar_value = verticalScrollBar()->value();
 856         if (scrollbar_value != synthetic_mouse_event_.scrollbar_value_old) {
 857                 // Yes it has. Store the params used to check this.
 858                 synthetic_mouse_event_.scrollbar_value_old = scrollbar_value;
 859
 860                 // ... and dispatch the event to the LyX core.
 861                 dispatch(synthetic_mouse_event_.cmd);
 862         }
 863 }
 864
 865
 866 void GuiWorkArea::keyPressEvent(QKeyEvent * ev)
 867 {
 868         // Do not process here some keys if dialog_mode_ is set
 869         if (dialog_mode_
 870                 && (ev->modifiers() == Qt::NoModifier
 871                     || ev->modifiers() == Qt::ShiftModifier)
 872                 && (ev->key() == Qt::Key_Escape
 873                     || ev->key() == Qt::Key_Enter
 874                     || ev->key() == Qt::Key_Return)
 875             ) {
 876                 ev->ignore();
 877                 return;
 878         }
 879
 880         // intercept some keys if completion popup is visible
 881         if (completer_->popupVisible()) {
 882                 switch (ev->key()) {
 883                 case Qt::Key_Enter:
 884                 case Qt::Key_Return:
 885                         completer_->activate();
 886                         ev->accept();
 887                         return;
 888                 }
 889         }
 890
 891         // do nothing if there are other events
 892         // (the auto repeated events come too fast)
 893         // \todo FIXME: remove hard coded Qt keys, process the key binding
 894 #ifdef Q_WS_X11
 895         if (XEventsQueued(QX11Info::display(), 0) > 1 && ev->isAutoRepeat()
 896                         && (Qt::Key_PageDown || Qt::Key_PageUp)) {
 897                 LYXERR(Debug::KEY, "system is busy: scroll key event ignored");
 898                 ev->ignore();
 899                 return;
 900         }
 901 #endif
 902
 903         LYXERR(Debug::KEY, " count: " << ev->count() << " text: " << ev->text()
 904                 << " isAutoRepeat: " << ev->isAutoRepeat() << " key: " << ev->key());
 905
 906         KeySymbol sym;
 907         setKeySymbol(&sym, ev);
 908         processKeySym(sym, q_key_state(ev->modifiers()));
 909         ev->accept();
 910 }
 911
 912
 913 void GuiWorkArea::doubleClickTimeout()
 914 {
 915         dc_event_.active = false;
 916 }
 917
 918
 919 void GuiWorkArea::mouseDoubleClickEvent(QMouseEvent * ev)
 920 {
 921         dc_event_ = DoubleClick(ev);
 922         QTimer::singleShot(QApplication::doubleClickInterval(), this,
 923                            SLOT(doubleClickTimeout()));
 924         FuncRequest cmd(LFUN_MOUSE_DOUBLE,
 925                         ev->x(), ev->y(),
 926                         q_button_state(ev->button()));
 927         dispatch(cmd);
 928         ev->accept();
 929 }
 930
 931
 932 void GuiWorkArea::resizeEvent(QResizeEvent * ev)
 933 {
 934         QAbstractScrollArea::resizeEvent(ev);
 935         need_resize_ = true;
 936         ev->accept();
 937 }
 938
 939
 940 void GuiWorkArea::update(int x, int y, int w, int h)
 941 {
 942         viewport()->repaint(x, y, w, h);
 943 }
 944
 945
 946 void GuiWorkArea::paintEvent(QPaintEvent * ev)
 947 {
 948         QRect const rc = ev->rect();
 949         // LYXERR(Debug::PAINTING, "paintEvent begin: x: " << rc.x()
 950         //      << " y: " << rc.y() << " w: " << rc.width() << " h: " << rc.height());
 951
 952         if (need_resize_) {
 953                 screen_ = QPixmap(viewport()->width(), viewport()->height());
 954                 resizeBufferView();
 955                 hideCursor();
 956                 showCursor();
 957         }
 958
 959         QPainter pain(viewport());
 960         pain.drawPixmap(rc, screen_, rc);
 961         cursor_->draw(pain);
 962         ev->accept();
 963 }
 964
 965
 966 void GuiWorkArea::updateScreen()
 967 {
 968         GuiPainter pain(&screen_);
 969         buffer_view_->draw(pain);
 970 }
 971
 972
 973 void GuiWorkArea::showCursor(int x, int y, int h,
 974         bool l_shape, bool rtl, bool completable)
 975 {
 976         if (schedule_redraw_) {
 977                 // This happens when a graphic conversion is finished. As we don't know
 978                 // the size of the new graphics, it's better the update everything.
 979                 // We can't use redraw() here because this would trigger a infinite
 980                 // recursive loop with showCursor().
 981                 buffer_view_->resize(viewport()->width(), viewport()->height());
 982                 updateScreen();
 983                 updateScrollbar();
 984                 viewport()->update(QRect(0, 0, viewport()->width(), viewport()->height()));
 985                 schedule_redraw_ = false;
 986                 // Show the cursor immediately after the update.
 987                 hideCursor();
 988                 toggleCursor();
 989                 return;
 990         }
 991
 992         cursor_->update(x, y, h, l_shape, rtl, completable);
 993         cursor_->show();
 994         viewport()->update(cursor_->rect());
 995 }
 996
 997
 998 void GuiWorkArea::removeCursor()
 999 {
1000         cursor_->hide();
1001         //if (!qApp->focusWidget())
1002                 viewport()->update(cursor_->rect());
1003 }
1004
1005
1006 void GuiWorkArea::inputMethodEvent(QInputMethodEvent * e)
1007 {
1008         QString const & commit_string = e->commitString();
1009         docstring const & preedit_string
1010                 = qstring_to_ucs4(e->preeditString());
1011
1012         if (!commit_string.isEmpty()) {
1013
1014                 LYXERR(Debug::KEY, "preeditString: " << e->preeditString()
1015                         << " commitString: " << e->commitString());
1016
1017                 int key = 0;
1018
1019                 // FIXME Iwami 04/01/07: we should take care also of UTF16 surrogates here.
1020                 for (int i = 0; i != commit_string.size(); ++i) {
1021                         QKeyEvent ev(QEvent::KeyPress, key, Qt::NoModifier, commit_string[i]);
1022                         keyPressEvent(&ev);
1023                 }
1024         }
1025
1026         // Hide the cursor during the kana-kanji transformation.
1027         if (preedit_string.empty())
1028                 startBlinkingCursor();
1029         else
1030                 stopBlinkingCursor();
1031
1032         // last_width : for checking if last preedit string was/wasn't empty.
1033         static bool last_width = false;
1034         if (!last_width && preedit_string.empty()) {
1035                 // if last_width is last length of preedit string.
1036                 e->accept();
1037                 return;
1038         }
1039
1040         GuiPainter pain(&screen_);
1041         buffer_view_->updateMetrics();
1042         buffer_view_->draw(pain);
1043         FontInfo font = buffer_view_->cursor().getFont().fontInfo();
1044         FontMetrics const & fm = theFontMetrics(font);
1045         int height = fm.maxHeight();
1046         int cur_x = cursor_->rect().left();
1047         int cur_y = cursor_->rect().bottom();
1048
1049         // redraw area of preedit string.
1050         update(0, cur_y - height, viewport()->width(),
1051                 (height + 1) * preedit_lines_);
1052
1053         if (preedit_string.empty()) {
1054                 last_width = false;
1055                 preedit_lines_ = 1;
1056                 e->accept();
1057                 return;
1058         }
1059         last_width = true;
1060
1061         // att : stores an IM attribute.
1062         QList<QInputMethodEvent::Attribute> const & att = e->attributes();
1063
1064         // get attributes of input method cursor.
1065         // cursor_pos : cursor position in preedit string.
1066         size_t cursor_pos = 0;
1067         bool cursor_is_visible = false;
1068         for (int i = 0; i != att.size(); ++i) {
1069                 if (att.at(i).type == QInputMethodEvent::Cursor) {
1070                         cursor_pos = att.at(i).start;
1071                         cursor_is_visible = att.at(i).length != 0;
1072                         break;
1073                 }
1074         }
1075
1076         size_t preedit_length = preedit_string.length();
1077
1078         // get position of selection in input method.
1079         // FIXME: isn't there a way to do this simplier?
1080         // rStart : cursor position in selected string in IM.
1081         size_t rStart = 0;
1082         // rLength : selected string length in IM.
1083         size_t rLength = 0;
1084         if (cursor_pos < preedit_length) {
1085                 for (int i = 0; i != att.size(); ++i) {
1086                         if (att.at(i).type == QInputMethodEvent::TextFormat) {
1087                                 if (att.at(i).start <= int(cursor_pos)
1088                                         && int(cursor_pos) < att.at(i).start + att.at(i).length) {
1089                                                 rStart = att.at(i).start;
1090                                                 rLength = att.at(i).length;
1091                                                 if (!cursor_is_visible)
1092                                                         cursor_pos += rLength;
1093                                                 break;
1094                                 }
1095                         }
1096                 }
1097         }
1098         else {
1099                 rStart = cursor_pos;
1100                 rLength = 0;
1101         }
1102
1103         int const right_margin = buffer_view_->rightMargin();
1104         Painter::preedit_style ps;
1105         // Most often there would be only one line:
1106         preedit_lines_ = 1;
1107         for (size_t pos = 0; pos != preedit_length; ++pos) {
1108                 char_type const typed_char = preedit_string[pos];
1109                 // reset preedit string style
1110                 ps = Painter::preedit_default;
1111
1112                 // if we reached the right extremity of the screen, go to next line.
1113                 if (cur_x + fm.width(typed_char) > viewport()->width() - right_margin) {
1114                         cur_x = right_margin;
1115                         cur_y += height + 1;
1116                         ++preedit_lines_;
1117                 }
1118                 // preedit strings are displayed with dashed underline
1119                 // and partial strings are displayed white on black indicating
1120                 // that we are in selecting mode in the input method.
1121                 // FIXME: rLength == preedit_length is not a changing condition
1122                 // FIXME: should be put out of the loop.
1123                 if (pos >= rStart
1124                         && pos < rStart + rLength
1125                         && !(cursor_pos < rLength && rLength == preedit_length))
1126                         ps = Painter::preedit_selecting;
1127
1128                 if (pos == cursor_pos
1129                         && (cursor_pos < rLength && rLength == preedit_length))
1130                         ps = Painter::preedit_cursor;
1131
1132                 // draw one character and update cur_x.
1133                 cur_x += pain.preeditText(cur_x, cur_y, typed_char, font, ps);
1134         }
1135
1136         // update the preedit string screen area.
1137         update(0, cur_y - preedit_lines_*height, viewport()->width(),
1138                 (height + 1) * preedit_lines_);
1139
1140         // Don't forget to accept the event!
1141         e->accept();
1142 }
1143
1144
1145 QVariant GuiWorkArea::inputMethodQuery(Qt::InputMethodQuery query) const
1146 {
1147         QRect cur_r(0, 0, 0, 0);
1148         switch (query) {
1149                 // this is the CJK-specific composition window position.
1150                 case Qt::ImMicroFocus:
1151                         cur_r = cursor_->rect();
1152                         if (preedit_lines_ != 1)
1153                                 cur_r.moveLeft(10);
1154                         cur_r.moveBottom(cur_r.bottom() + cur_r.height() * preedit_lines_);
1155                         // return lower right of cursor in LyX.
1156                         return cur_r;
1157                 default:
1158                         return QWidget::inputMethodQuery(query);
1159         }
1160 }
1161
1162
1163 void GuiWorkArea::updateWindowTitle()
1164 {
1165         docstring maximize_title;
1166         docstring minimize_title;
1167
1168         Buffer & buf = buffer_view_->buffer();
1169         FileName const fileName = buf.fileName();
1170         if (!fileName.empty()) {
1171                 maximize_title = fileName.displayName(30);
1172                 minimize_title = from_utf8(fileName.onlyFileName());
1173                 if (buf.lyxvc().inUse()) {
1174                         if (buf.lyxvc().locker().empty())
1175                                 maximize_title +=  _(" (version control)");
1176                         else
1177                                 maximize_title +=  _(" (version control, locking)");
1178                 }
1179                 if (!buf.isClean()) {
1180                         maximize_title += _(" (changed)");
1181                         minimize_title += char_type('*');
1182                 }
1183                 if (buf.isReadonly())
1184                         maximize_title += _(" (read only)");
1185         }
1186
1187         QString title = windowTitle();
1188         QString new_title = toqstr(maximize_title);
1189         if (title == new_title)
1190                 return;
1191
1192         QWidget::setWindowTitle(new_title);
1193         QWidget::setWindowIconText(toqstr(minimize_title));
1194         titleChanged(this);
1195 }
1196
1197
1198 void GuiWorkArea::setReadOnly(bool)
1199 {
1200         updateWindowTitle();
1201         if (this == lyx_view_->currentWorkArea())
1202                 lyx_view_->updateDialogs();
1203 }
1204
1205
1206 bool GuiWorkArea::isFullScreen()
1207 {
1208         return lyx_view_ && lyx_view_->isFullScreen();
1209 }
1210
1211
1212 ////////////////////////////////////////////////////////////////////
1213 //
1214 // EmbeddedWorkArea
1215 //
1216 ////////////////////////////////////////////////////////////////////
1217
1218
1219 EmbeddedWorkArea::EmbeddedWorkArea(QWidget * w): GuiWorkArea(w)
1220 {
1221         buffer_ = theBufferList().newBuffer(
1222                 support::FileName::tempName().absFilename() + "_embedded.internal");
1223         buffer_->setUnnamed(true);
1224         buffer_->setFullyLoaded(true);
1225         setBuffer(*buffer_);
1226         setDialogMode(true);
1227 }
1228
1229
1230 EmbeddedWorkArea::~EmbeddedWorkArea()
1231 {
1232         // No need to destroy buffer and bufferview here, because it is done
1233         // in theBuffeerList() destruction loop at application exit
1234 }
1235
1236
1237 void EmbeddedWorkArea::closeEvent(QCloseEvent * ev)
1238 {
1239         disable();
1240         GuiWorkArea::closeEvent(ev);
1241 }
1242
1243
1244 void EmbeddedWorkArea::hideEvent(QHideEvent * ev)
1245 {
1246         disable();
1247         GuiWorkArea::hideEvent(ev);
1248 }
1249
1250
1251 void EmbeddedWorkArea::disable()
1252 {
1253         stopBlinkingCursor();
1254         if (view().currentWorkArea() != this)
1255                 return;
1256         LASSERT(view().currentMainWorkArea(), /* */);
1257         view().setCurrentWorkArea(view().currentMainWorkArea());
1258 }
1259
1260 ////////////////////////////////////////////////////////////////////
1261 //
1262 // TabWorkArea
1263 //
1264 ////////////////////////////////////////////////////////////////////
1265
1266 #ifdef Q_WS_MACX
1267 class NoTabFrameMacStyle : public QMacStyle {
1268 public:
1269         ///
1270         QRect subElementRect(SubElement element, const QStyleOption * option,
1271                              const QWidget * widget = 0) const
1272         {
1273                 QRect rect = QMacStyle::subElementRect(element, option, widget);
1274                 bool noBar = static_cast<QTabWidget const *>(widget)->count() <= 1;
1275
1276                 // The Qt Mac style puts the contents into a 3 pixel wide box
1277                 // which looks very ugly and not like other Mac applications.
1278                 // Hence we remove this here, and moreover the 16 pixel round
1279                 // frame above if the tab bar is hidden.
1280                 if (element == QStyle::SE_TabWidgetTabContents) {
1281                         rect.adjust(- rect.left(), 0, rect.left(), 0);
1282                         if (noBar)
1283                                 rect.setTop(0);
1284                 }
1285
1286                 return rect;
1287         }
1288 };
1289
1290 NoTabFrameMacStyle noTabFrameMacStyle;
1291 #endif
1292
1293
1294 TabWorkArea::TabWorkArea(QWidget * parent)
1295         : QTabWidget(parent), clicked_tab_(-1)
1296 {
1297 #ifdef Q_WS_MACX
1298         setStyle(&noTabFrameMacStyle);
1299 #endif
1300
1301         QPalette pal = palette();
1302         pal.setColor(QPalette::Active, QPalette::Button,
1303                 pal.color(QPalette::Active, QPalette::Window));
1304         pal.setColor(QPalette::Disabled, QPalette::Button,
1305                 pal.color(QPalette::Disabled, QPalette::Window));
1306         pal.setColor(QPalette::Inactive, QPalette::Button,
1307                 pal.color(QPalette::Inactive, QPalette::Window));
1308
1309         QObject::connect(this, SIGNAL(currentChanged(int)),
1310                 this, SLOT(on_currentTabChanged(int)));
1311
1312         closeBufferButton = new QToolButton(this);
1313         closeBufferButton->setPalette(pal);
1314         // FIXME: rename the icon to closebuffer.png
1315         closeBufferButton->setIcon(QIcon(getPixmap("images/", "closetab", "png")));
1316         closeBufferButton->setText("Close File");
1317         closeBufferButton->setAutoRaise(true);
1318         closeBufferButton->setCursor(Qt::ArrowCursor);
1319         closeBufferButton->setToolTip(qt_("Close File"));
1320         closeBufferButton->setEnabled(true);
1321         QObject::connect(closeBufferButton, SIGNAL(clicked()),
1322                 this, SLOT(closeCurrentBuffer()));
1323         setCornerWidget(closeBufferButton, Qt::TopRightCorner);
1324
1325         // setup drag'n'drop
1326         QTabBar* tb = new DragTabBar;
1327         connect(tb, SIGNAL(tabMoveRequested(int, int)),
1328                 this, SLOT(moveTab(int, int)));
1329         tb->setElideMode(Qt::ElideNone);
1330         setTabBar(tb);
1331
1332         // make us responsible for the context menu of the tabbar
1333         tb->setContextMenuPolicy(Qt::CustomContextMenu);
1334         connect(tb, SIGNAL(customContextMenuRequested(const QPoint &)),
1335                 this, SLOT(showContextMenu(const QPoint &)));
1336
1337         setUsesScrollButtons(true);
1338 }
1339
1340
1341 void TabWorkArea::setFullScreen(bool full_screen)
1342 {
1343         for (int i = 0; i != count(); ++i) {
1344                 if (GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i)))
1345                         wa->setFullScreen(full_screen);
1346         }
1347
1348         if (lyxrc.full_screen_tabbar)
1349                 showBar(!full_screen && count()>1);
1350 }
1351
1352
1353 void TabWorkArea::showBar(bool show)
1354 {
1355         tabBar()->setEnabled(show);
1356         tabBar()->setVisible(show);
1357         closeBufferButton->setVisible(show);
1358 }
1359
1360
1361 GuiWorkArea * TabWorkArea::currentWorkArea()
1362 {
1363         if (count() == 0)
1364                 return 0;
1365
1366         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(currentWidget());
1367         LASSERT(wa, /**/);
1368         return wa;
1369 }
1370
1371
1372 GuiWorkArea * TabWorkArea::workArea(Buffer & buffer)
1373 {
1374         for (int i = 0; i != count(); ++i) {
1375                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i));
1376                 LASSERT(wa, return 0);
1377                 if (&wa->bufferView().buffer() == &buffer)
1378                         return wa;
1379         }
1380         return 0;
1381 }
1382
1383
1384 void TabWorkArea::closeAll()
1385 {
1386         while (count()) {
1387                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(0));
1388                 LASSERT(wa, /**/);
1389                 removeTab(0);
1390                 delete wa;
1391         }
1392 }
1393
1394
1395 bool TabWorkArea::setCurrentWorkArea(GuiWorkArea * work_area)
1396 {
1397         LASSERT(work_area, /**/);
1398         int index = indexOf(work_area);
1399         if (index == -1)
1400                 return false;
1401
1402         if (index == currentIndex())
1403                 // Make sure the work area is up to date.
1404                 on_currentTabChanged(index);
1405         else
1406                 // Switch to the work area.
1407                 setCurrentIndex(index);
1408         work_area->setFocus();
1409
1410         return true;
1411 }
1412
1413
1414 GuiWorkArea * TabWorkArea::addWorkArea(Buffer & buffer, GuiView & view)
1415 {
1416         GuiWorkArea * wa = new GuiWorkArea(buffer, view);
1417         wa->setUpdatesEnabled(false);
1418         // Hide tabbar if there's no tab (avoid a resize and a flashing tabbar
1419         // when hiding it again below).
1420         if (!(currentWorkArea() && currentWorkArea()->isFullScreen()))
1421                 showBar(count() > 0);
1422         addTab(wa, wa->windowTitle());
1423         QObject::connect(wa, SIGNAL(titleChanged(GuiWorkArea *)),
1424                 this, SLOT(updateTabTexts()));
1425         if (currentWorkArea() && currentWorkArea()->isFullScreen())
1426                 setFullScreen(true);
1427         else
1428                 // Hide tabbar if there's only one tab.
1429                 showBar(count() > 1);
1430
1431         updateTabTexts();
1432
1433         return wa;
1434 }
1435
1436
1437 bool TabWorkArea::removeWorkArea(GuiWorkArea * work_area)
1438 {
1439         LASSERT(work_area, return false);
1440         int index = indexOf(work_area);
1441         if (index == -1)
1442                 return false;
1443
1444         work_area->setUpdatesEnabled(false);
1445         removeTab(index);
1446         delete work_area;
1447
1448         if (count()) {
1449                 // make sure the next work area is enabled.
1450                 currentWidget()->setUpdatesEnabled(true);
1451                 if (currentWorkArea() && currentWorkArea()->isFullScreen())
1452                         setFullScreen(true);
1453                 else
1454                         // Hide tabbar if there's only one tab.
1455                         showBar(count() > 1);
1456         } else {
1457                 lastWorkAreaRemoved();
1458         }
1459
1460         updateTabTexts();
1461
1462         return true;
1463 }
1464
1465
1466 void TabWorkArea::on_currentTabChanged(int i)
1467 {
1468         // returns e.g. on application destruction
1469         if (i == -1)
1470                 return;
1471         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i));
1472         LASSERT(wa, return);
1473         BufferView & bv = wa->bufferView();
1474         bv.cursor().fixIfBroken();
1475         bv.updateMetrics();
1476         wa->setUpdatesEnabled(true);
1477         wa->redraw();
1478         wa->setFocus();
1479         ///
1480         currentWorkAreaChanged(wa);
1481
1482         LYXERR(Debug::GUI, "currentTabChanged " << i
1483                 << "File" << bv.buffer().absFileName());
1484 }
1485
1486
1487 void TabWorkArea::closeCurrentBuffer()
1488 {
1489         if (clicked_tab_ != -1)
1490                 setCurrentIndex(clicked_tab_);
1491         else
1492                 // Before dispatching the LFUN we should be sure this
1493                 // is the current workarea.
1494                 currentWorkAreaChanged(currentWorkArea());
1495
1496         lyx::dispatch(FuncRequest(LFUN_BUFFER_CLOSE));
1497 }
1498
1499
1500 void TabWorkArea::closeCurrentTab()
1501 {
1502         if (clicked_tab_ == -1)
1503                 removeWorkArea(currentWorkArea());
1504         else {
1505                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(clicked_tab_));
1506                 LASSERT(wa, /**/);
1507                 removeWorkArea(wa);
1508         }
1509 }
1510
1511 ///
1512 class DisplayPath {
1513 public:
1514         /// make vector happy
1515         DisplayPath() {}
1516         ///
1517         DisplayPath(int tab, FileName const & filename)
1518                 : tab_(tab)
1519         {
1520                 filename_ = toqstr(filename.onlyFileNameWithoutExt());
1521                 postfix_ = toqstr(filename.absoluteFilePath()).
1522                         split("/", QString::SkipEmptyParts);
1523                 postfix_.pop_back();
1524                 abs_ = toqstr(filename.absoluteFilePath());
1525                 dottedPrefix_ = false;
1526         }
1527
1528         /// Absolute path for debugging.
1529         QString abs() const
1530         {
1531                 return abs_;
1532         }
1533         /// Add the first segment from the postfix or three dots to the prefix.
1534         /// Merge multiple dot tripples. In fact dots are added lazily, i.e. only
1535         /// when really needed.
1536         void shiftPathSegment(bool dotted)
1537         {
1538                 if (postfix_.count() <= 0)
1539                         return;
1540
1541                 if (!dotted) {
1542                         if (dottedPrefix_ && !prefix_.isEmpty())
1543                                 prefix_ += ".../";
1544                         prefix_ += postfix_.front() + "/";
1545                 }
1546                 dottedPrefix_ = dotted && !prefix_.isEmpty();
1547                 postfix_.pop_front();
1548         }
1549         ///
1550         QString displayString() const
1551         {
1552                 if (prefix_.isEmpty())
1553                         return filename_;
1554
1555                 bool dots = dottedPrefix_ || !postfix_.isEmpty();
1556                 return prefix_ + (dots ? ".../" : "") + filename_;
1557         }
1558         ///
1559         QString forecastPathString() const
1560         {
1561                 if (postfix_.count() == 0)
1562                         return displayString();
1563
1564                 return prefix_
1565                         + (dottedPrefix_ ? ".../" : "")
1566                         + postfix_.front() + "/";
1567         }
1568         ///
1569         bool final() const { return postfix_.empty(); }
1570         ///
1571         int tab() const { return tab_; }
1572
1573 private:
1574         ///
1575         QString prefix_;
1576         ///
1577         QStringList postfix_;
1578         ///
1579         QString filename_;
1580         ///
1581         QString abs_;
1582         ///
1583         int tab_;
1584         ///
1585         bool dottedPrefix_;
1586 };
1587
1588
1589 ///
1590 bool operator<(DisplayPath const & a, DisplayPath const & b)
1591 {
1592         return a.displayString() < b.displayString();
1593 }
1594
1595 ///
1596 bool operator==(DisplayPath const & a, DisplayPath const & b)
1597 {
1598         return a.displayString() == b.displayString();
1599 }
1600
1601
1602 void TabWorkArea::updateTabTexts()
1603 {
1604         size_t n = count();
1605         if (n == 0)
1606                 return;
1607         std::list<DisplayPath> paths;
1608         typedef std::list<DisplayPath>::iterator It;
1609
1610         // collect full names first: path into postfix, empty prefix and
1611         // filename without extension
1612         for (size_t i = 0; i < n; ++i) {
1613                 GuiWorkArea * i_wa = dynamic_cast<GuiWorkArea *>(widget(i));
1614                 FileName const fn = i_wa->bufferView().buffer().fileName();
1615                 paths.push_back(DisplayPath(i, fn));
1616         }
1617
1618         // go through path segments and see if it helps to make the path more unique
1619         bool somethingChanged = true;
1620         bool allFinal = false;
1621         while (somethingChanged && !allFinal) {
1622                 // adding path segments changes order
1623                 paths.sort();
1624
1625                 LYXERR(Debug::GUI, "updateTabTexts() iteration start");
1626                 somethingChanged = false;
1627                 allFinal = true;
1628
1629                 // find segments which are not unique (i.e. non-atomic)
1630                 It it = paths.begin();
1631                 It segStart = it;
1632                 QString segString = it->displayString();
1633                 for (; it != paths.end(); ++it) {
1634                         // look to the next item
1635                         It next = it;
1636                         ++next;
1637
1638                         // final?
1639                         allFinal = allFinal && it->final();
1640
1641                         LYXERR(Debug::GUI, "it = " << it->abs()
1642                                << " => " << it->displayString());
1643
1644                         // still the same segment?
1645                         QString nextString;
1646                         if ((next != paths.end()
1647                              && (nextString = next->displayString()) == segString))
1648                                 continue;
1649                         LYXERR(Debug::GUI, "segment ended");
1650
1651                         // only a trivial one with one element?
1652                         if (it == segStart) {
1653                                 // start new segment
1654                                 segStart = next;
1655                                 segString = nextString;
1656                                 continue;
1657                         }
1658
1659                         // we found a non-atomic segment segStart <= sit <= it < next.
1660                         // Shift path segments and hope for the best
1661                         // that it makes the path more unique.
1662                         somethingChanged = true;
1663                         It sit = segStart;
1664                         QString dspString = sit->forecastPathString();
1665                         LYXERR(Debug::GUI, "first forecast found for "
1666                                << sit->abs() << " => " << dspString);
1667                         ++sit;
1668                         bool moreUnique = false;
1669                         for (; sit != next; ++sit) {
1670                                 if (sit->forecastPathString() != dspString) {
1671                                         LYXERR(Debug::GUI, "different forecast found for "
1672                                                 << sit->abs() << " => " << sit->forecastPathString());
1673                                         moreUnique = true;
1674                                         break;
1675                                 }
1676                                 LYXERR(Debug::GUI, "same forecast found for "
1677                                         << sit->abs() << " => " << dspString);
1678                         }
1679
1680                         // if the path segment helped, add it. Otherwise add dots
1681                         bool dots = !moreUnique;
1682                         LYXERR(Debug::GUI, "using dots = " << dots);
1683                         for (sit = segStart; sit != next; ++sit) {
1684                                 sit->shiftPathSegment(dots);
1685                                 LYXERR(Debug::GUI, "shifting "
1686                                         << sit->abs() << " => " << sit->displayString());
1687                         }
1688
1689                         // start new segment
1690                         segStart = next;
1691                         segString = nextString;
1692                 }
1693         }
1694
1695         // set new tab titles
1696         for (It it = paths.begin(); it != paths.end(); ++it) {
1697                 GuiWorkArea * i_wa = dynamic_cast<GuiWorkArea *>(widget(it->tab()));
1698                 Buffer & buf = i_wa->bufferView().buffer();
1699                 if (!buf.fileName().empty() && !buf.isClean())
1700                         setTabText(it->tab(), it->displayString() + "*");
1701                 else
1702                         setTabText(it->tab(), it->displayString());
1703         }
1704 }
1705
1706
1707 void TabWorkArea::showContextMenu(const QPoint & pos)
1708 {
1709         // which tab?
1710         clicked_tab_ = static_cast<DragTabBar *>(tabBar())->tabAt(pos);
1711         if (clicked_tab_ == -1)
1712                 return;
1713
1714         // show tab popup
1715         QMenu popup;
1716         popup.addAction(QIcon(getPixmap("images/", "hidetab", "png")),
1717                 qt_("Hide tab"), this, SLOT(closeCurrentTab()));
1718         popup.addAction(QIcon(getPixmap("images/", "closetab", "png")),
1719                 qt_("Close tab"), this, SLOT(closeCurrentBuffer()));
1720         popup.exec(tabBar()->mapToGlobal(pos));
1721
1722         clicked_tab_ = -1;
1723 }
1724
1725
1726 void TabWorkArea::moveTab(int fromIndex, int toIndex)
1727 {
1728         QWidget * w = widget(fromIndex);
1729         QIcon icon = tabIcon(fromIndex);
1730         QString text = tabText(fromIndex);
1731
1732         setCurrentIndex(fromIndex);
1733         removeTab(fromIndex);
1734         insertTab(toIndex, w, icon, text);
1735         setCurrentIndex(toIndex);
1736 }
1737
1738
1739 DragTabBar::DragTabBar(QWidget* parent)
1740         : QTabBar(parent)
1741 {
1742         setAcceptDrops(true);
1743 }
1744
1745
1746 #if QT_VERSION < 0x040300
1747 int DragTabBar::tabAt(QPoint const & position) const
1748 {
1749         const int max = count();
1750         for (int i = 0; i < max; ++i) {
1751                 if (tabRect(i).contains(position))
1752                         return i;
1753         }
1754         return -1;
1755 }
1756 #endif
1757
1758
1759 void DragTabBar::mousePressEvent(QMouseEvent * event)
1760 {
1761         if (event->button() == Qt::LeftButton)
1762                 dragStartPos_ = event->pos();
1763         QTabBar::mousePressEvent(event);
1764 }
1765
1766
1767 void DragTabBar::mouseMoveEvent(QMouseEvent * event)
1768 {
1769         // If the left button isn't pressed anymore then return
1770         if (!(event->buttons() & Qt::LeftButton))
1771                 return;
1772
1773         // If the distance is too small then return
1774         if ((event->pos() - dragStartPos_).manhattanLength()
1775             < QApplication::startDragDistance())
1776                 return;
1777
1778         // did we hit something after all?
1779         int tab = tabAt(dragStartPos_);
1780         if (tab == -1)
1781                 return;
1782
1783         // simulate button release to remove highlight from button
1784         int i = currentIndex();
1785         QMouseEvent me(QEvent::MouseButtonRelease, dragStartPos_,
1786                 event->button(), event->buttons(), 0);
1787         QTabBar::mouseReleaseEvent(&me);
1788         setCurrentIndex(i);
1789
1790         // initiate Drag
1791         QDrag * drag = new QDrag(this);
1792         QMimeData * mimeData = new QMimeData;
1793         // a crude way to distinguish tab-reodering drops from other ones
1794         mimeData->setData("action", "tab-reordering") ;
1795         drag->setMimeData(mimeData);
1796
1797 #if QT_VERSION >= 0x040300
1798         // get tab pixmap as cursor
1799         QRect r = tabRect(tab);
1800         QPixmap pixmap(r.size());
1801         render(&pixmap, - r.topLeft());
1802         drag->setPixmap(pixmap);
1803         drag->exec();
1804 #else
1805         drag->start(Qt::MoveAction);
1806 #endif
1807
1808 }
1809
1810
1811 void DragTabBar::dragEnterEvent(QDragEnterEvent * event)
1812 {
1813         // Only accept if it's an tab-reordering request
1814         QMimeData const * m = event->mimeData();
1815         QStringList formats = m->formats();
1816         if (formats.contains("action")
1817             && m->data("action") == "tab-reordering")
1818                 event->acceptProposedAction();
1819 }
1820
1821
1822 void DragTabBar::dropEvent(QDropEvent * event)
1823 {
1824         int fromIndex = tabAt(dragStartPos_);
1825         int toIndex = tabAt(event->pos());
1826
1827         // Tell interested objects that
1828         if (fromIndex != toIndex)
1829                 tabMoveRequested(fromIndex, toIndex);
1830         event->acceptProposedAction();
1831 }
1832
1833
1834 } // namespace frontend
1835 } // namespace lyx
1836
1837 #include "moc_GuiWorkArea.cpp"