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