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