src/frontends/qt4/GuiWorkArea.cpp

   1 /**
   2  * \file GuiWorkArea.cpp
   3  * This file is part of LyX, the document processor.
   4  * Licence details can be found in the file COPYING.
   5  *
   6  * \author John Levon
   7  * \author Abdelrazak Younes
   8  *
   9  * Full author contact details are available in file CREDITS.
  10  */
  11
  12 #include <config.h>
  13
  14 #include "GuiWorkArea.h"
  15
  16 #include "Buffer.h"
  17 #include "BufferParams.h"
  18 #include "BufferView.h"
  19 #include "CoordCache.h"
  20 #include "Cursor.h"
  21 #include "Font.h"
  22 #include "FuncRequest.h"
  23 #include "GuiApplication.h"
  24 #include "GuiCompleter.h"
  25 #include "GuiKeySymbol.h"
  26 #include "GuiPainter.h"
  27 #include "GuiView.h"
  28 #include "KeySymbol.h"
  29 #include "Language.h"
  30 #include "LyXFunc.h"
  31 #include "LyXRC.h"
  32 #include "MetricsInfo.h"
  33 #include "qt_helpers.h"
  34 #include "Text.h"
  35 #include "version.h"
  36
  37 #include "graphics/GraphicsImage.h"
  38 #include "graphics/GraphicsLoader.h"
  39
  40 #include "support/debug.h"
  41 #include "support/gettext.h"
  42 #include "support/FileName.h"
  43
  44 #include "frontends/Application.h"
  45 #include "frontends/FontMetrics.h"
  46 #include "frontends/WorkAreaManager.h"
  47
  48 #include <QContextMenuEvent>
  49 #include <QInputContext>
  50 #include <QHelpEvent>
  51 #ifdef Q_WS_MACX
  52 #include <QMacStyle>
  53 #endif
  54 #include <QMainWindow>
  55 #include <QMenu>
  56 #include <QPainter>
  57 #include <QPalette>
  58 #include <QPixmapCache>
  59 #include <QScrollBar>
  60 #include <QTimer>
  61 #include <QToolButton>
  62 #include <QToolTip>
  63
  64 #include <boost/bind.hpp>
  65
  66 #ifdef Q_WS_X11
  67 #include <QX11Info>
  68 extern "C" int XEventsQueued(Display *display, int mode);
  69 #endif
  70
  71 #ifdef Q_WS_WIN
  72 int const CursorWidth = 2;
  73 #else
  74 int const CursorWidth = 1;
  75 #endif
  76 int const TabIndicatorWidth = 3;
  77
  78 #undef KeyPress
  79 #undef NoModifier
  80
  81 using namespace std;
  82 using namespace lyx::support;
  83
  84 namespace lyx {
  85
  86
  87 /// return the LyX mouse button state from Qt's
  88 static mouse_button::state q_button_state(Qt::MouseButton button)
  89 {
  90         mouse_button::state b = mouse_button::none;
  91         switch (button) {
  92                 case Qt::LeftButton:
  93                         b = mouse_button::button1;
  94                         break;
  95                 case Qt::MidButton:
  96                         b = mouse_button::button2;
  97                         break;
  98                 case Qt::RightButton:
  99                         b = mouse_button::button3;
 100                         break;
 101                 default:
 102                         break;
 103         }
 104         return b;
 105 }
 106
 107
 108 /// return the LyX mouse button state from Qt's
 109 mouse_button::state q_motion_state(Qt::MouseButtons state)
 110 {
 111         mouse_button::state b = mouse_button::none;
 112         if (state & Qt::LeftButton)
 113                 b |= mouse_button::button1;
 114         if (state & Qt::MidButton)
 115                 b |= mouse_button::button2;
 116         if (state & Qt::RightButton)
 117                 b |= mouse_button::button3;
 118         return b;
 119 }
 120
 121
 122 namespace frontend {
 123
 124 class CursorWidget {
 125 public:
 126         CursorWidget() {}
 127
 128         void draw(QPainter & painter)
 129         {
 130                 if (!show_ || !rect_.isValid())
 131                         return;
 132
 133                 int y = rect_.top();
 134                 int l = x_ - rect_.left();
 135                 int r = rect_.right() - x_;
 136                 int bot = rect_.bottom();
 137
 138                 // draw vertica linel
 139                 painter.fillRect(x_, y, CursorWidth, rect_.height(), color_);
 140
 141                 // draw RTL/LTR indication
 142                 painter.setPen(color_);
 143                 if (l_shape_) {
 144                         if (rtl_)
 145                                 painter.drawLine(x_, bot, x_ - l, bot);
 146                         else
 147                                 painter.drawLine(x_, bot, x_ + CursorWidth + r, bot);
 148                 }
 149
 150                 // draw completion triangle
 151                 if (completable_) {
 152                         int m = y + rect_.height() / 2;
 153                         int d = TabIndicatorWidth - 1;
 154                         if (rtl_) {
 155                                 painter.drawLine(x_ - 1, m - d, x_ - 1 - d, m);
 156                                 painter.drawLine(x_ - 1, m + d, x_ - 1 - d, m);
 157                         } else {
 158                                 painter.drawLine(x_ + CursorWidth, m - d, x_ + CursorWidth + d, m);
 159                                 painter.drawLine(x_ + CursorWidth, m + d, x_ + CursorWidth + d, m);
 160                         }
 161                 }
 162         }
 163
 164         void update(int x, int y, int h, bool l_shape,
 165                 bool rtl, bool completable)
 166         {
 167                 color_ = guiApp->colorCache().get(Color_cursor);
 168                 l_shape_ = l_shape;
 169                 rtl_ = rtl;
 170                 completable_ = completable;
 171                 x_ = x;
 172
 173                 // extension to left and right
 174                 int l = 0;
 175                 int r = 0;
 176
 177                 // RTL/LTR indication
 178                 if (l_shape_) {
 179                         if (rtl)
 180                                 l += h / 3;
 181                         else
 182                                 r += h / 3;
 183                 }
 184
 185                 // completion triangle
 186                 if (completable_) {
 187                         if (rtl)
 188                                 l = max(l, TabIndicatorWidth);
 189                         else
 190                                 r = max(r, TabIndicatorWidth);
 191                 }
 192
 193                 // compute overall rectangle
 194                 rect_ = QRect(x - l, y, CursorWidth + r + l, h);
 195         }
 196
 197         void show(bool set_show = true) { show_ = set_show; }
 198         void hide() { show_ = false; }
 199
 200         QRect const & rect() { return rect_; }
 201
 202 private:
 203         /// cursor is in RTL or LTR text
 204         bool rtl_;
 205         /// indication for RTL or LTR
 206         bool l_shape_;
 207         /// triangle to show that a completion is available
 208         bool completable_;
 209         ///
 210         bool show_;
 211         ///
 212         QColor color_;
 213         /// rectangle, possibly with l_shape and completion triangle
 214         QRect rect_;
 215         /// x position (were the vertical line is drawn)
 216         int x_;
 217 };
 218
 219
 220 // This is a 'heartbeat' generating synthetic mouse move events when the
 221 // cursor is at the top or bottom edge of the viewport. One scroll per 0.2 s
 222 SyntheticMouseEvent::SyntheticMouseEvent()
 223         : timeout(200), restart_timeout(true),
 224           x_old(-1), y_old(-1), scrollbar_value_old(-1.0)
 225 {}
 226
 227
 228
 229 GuiWorkArea::GuiWorkArea(Buffer & buffer, GuiView & lv)
 230         : buffer_view_(new BufferView(buffer)), lyx_view_(&lv),
 231         cursor_visible_(false),
 232         need_resize_(false), schedule_redraw_(false),
 233         preedit_lines_(1), completer_(new GuiCompleter(this))
 234 {
 235         buffer.workAreaManager().add(this);
 236         // Setup the signals
 237         connect(&cursor_timeout_, SIGNAL(timeout()),
 238                 this, SLOT(toggleCursor()));
 239
 240         int const time = QApplication::cursorFlashTime() / 2;
 241         if (time > 0) {
 242                 cursor_timeout_.setInterval(time);
 243                 cursor_timeout_.start();
 244         } else {
 245                 // let's initialize this just to be safe
 246                 cursor_timeout_.setInterval(500);
 247         }
 248
 249         screen_ = QPixmap(viewport()->width(), viewport()->height());
 250         cursor_ = new frontend::CursorWidget();
 251         cursor_->hide();
 252
 253         // HACK: Prevents an additional redraw when the scrollbar pops up
 254         // which regularily happens on documents with more than one page.
 255         // The policy  should be set to "Qt::ScrollBarAsNeeded" soon.
 256         // Since we have no geometry information yet, we assume that
 257         // a document needs a scrollbar if there is more then four
 258         // paragraph in the outermost text.
 259         if (buffer.text().paragraphs().size() > 4)
 260                 setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
 261         QTimer::singleShot(50, this, SLOT(fixVerticalScrollBar()));
 262
 263
 264         setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 265         setAcceptDrops(true);
 266         setMouseTracking(true);
 267         setMinimumSize(100, 70);
 268 #ifdef Q_WS_MACX
 269         setFrameStyle(QFrame::NoFrame);
 270 #else
 271         setFrameStyle(QFrame::Box);
 272 #endif
 273         updateWindowTitle();
 274
 275         viewport()->setAutoFillBackground(false);
 276         // We don't need double-buffering nor SystemBackground on
 277         // the viewport because we have our own backing pixmap.
 278         viewport()->setAttribute(Qt::WA_NoSystemBackground);
 279
 280         setFocusPolicy(Qt::WheelFocus);
 281
 282         viewport()->setCursor(Qt::IBeamCursor);
 283
 284         synthetic_mouse_event_.timeout.timeout.connect(
 285                 boost::bind(&GuiWorkArea::generateSyntheticMouseEvent,
 286                                         this));
 287
 288         // Initialize the vertical Scroll Bar
 289         QObject::connect(verticalScrollBar(), SIGNAL(valueChanged(int)),
 290                 this, SLOT(scrollTo(int)));
 291
 292         LYXERR(Debug::GUI, "viewport width: " << viewport()->width()
 293                 << "  viewport height: " << viewport()->height());
 294
 295         // Enables input methods for asian languages.
 296         // Must be set when creating custom text editing widgets.
 297         setAttribute(Qt::WA_InputMethodEnabled, true);
 298 }
 299
 300
 301 GuiWorkArea::~GuiWorkArea()
 302 {
 303         buffer_view_->buffer().workAreaManager().remove(this);
 304         delete buffer_view_;
 305         delete cursor_;
 306 }
 307
 308
 309 void GuiWorkArea::fixVerticalScrollBar()
 310 {
 311         if (!isFullScreen())
 312                 setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
 313 }
 314
 315
 316 void GuiWorkArea::close()
 317 {
 318         lyx_view_->removeWorkArea(this);
 319 }
 320
 321
 322 void GuiWorkArea::setFullScreen(bool full_screen)
 323 {
 324         buffer_view_->setFullScreen(full_screen);
 325         if (full_screen) {
 326                 setFrameStyle(QFrame::NoFrame);
 327                 if (lyxrc.full_screen_scrollbar)
 328                         setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 329         } else {
 330 #ifdef Q_WS_MACX
 331                 setFrameStyle(QFrame::NoFrame);
 332 #else
 333                 setFrameStyle(QFrame::Box);
 334 #endif
 335                 setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
 336         }
 337 }
 338
 339
 340 BufferView & GuiWorkArea::bufferView()
 341 {
 342         return *buffer_view_;
 343 }
 344
 345
 346 BufferView const & GuiWorkArea::bufferView() const
 347 {
 348         return *buffer_view_;
 349 }
 350
 351
 352 void GuiWorkArea::stopBlinkingCursor()
 353 {
 354         cursor_timeout_.stop();
 355         hideCursor();
 356 }
 357
 358
 359 void GuiWorkArea::startBlinkingCursor()
 360 {
 361         showCursor();
 362         //we're not supposed to cache this value.
 363         int const time = QApplication::cursorFlashTime() / 2;
 364         if (time <= 0)
 365                 return;
 366         cursor_timeout_.setInterval(time);
 367         cursor_timeout_.start();
 368 }
 369
 370
 371 void GuiWorkArea::redraw()
 372 {
 373         if (!isVisible())
 374                 // No need to redraw in this case.
 375                 return;
 376
 377         // No need to do anything if this is the current view. The BufferView
 378         // metrics are already up to date.
 379         if (lyx_view_ != guiApp->currentView()
 380                 || lyx_view_->currentWorkArea() != this) {
 381                 // FIXME: it would be nice to optimize for the off-screen case.
 382                 buffer_view_->updateMetrics();
 383                 buffer_view_->cursor().fixIfBroken();
 384         }
 385
 386         // update cursor position, because otherwise it has to wait until
 387         // the blinking interval is over
 388         if (cursor_visible_) {
 389                 hideCursor();
 390                 showCursor();
 391         }
 392
 393         LYXERR(Debug::WORKAREA, "WorkArea::redraw screen");
 394         updateScreen();
 395         update(0, 0, viewport()->width(), viewport()->height());
 396
 397         /// \warning: scrollbar updating *must* be done after the BufferView is drawn
 398         /// because \c BufferView::updateScrollbar() is called in \c BufferView::draw().
 399         updateScrollbar();
 400         lyx_view_->updateStatusBar();
 401
 402         if (lyxerr.debugging(Debug::WORKAREA))
 403                 buffer_view_->coordCache().dump();
 404 }
 405
 406
 407 void GuiWorkArea::processKeySym(KeySymbol const & key, KeyModifier mod)
 408 {
 409         // In order to avoid bad surprise in the middle of an operation,
 410         // we better stop the blinking cursor...
 411         // the cursor gets restarted in GuiView::restartCursor()
 412         stopBlinkingCursor();
 413
 414         if (lyx_view_->isFullScreen() && lyx_view_->menuBar()->isVisible()) {
 415                 // FIXME: we should not have to do this here. See related comment in
 416                 // GuiView::event().
 417                 lyx_view_->menuBar()->hide();
 418         }
 419
 420         theLyXFunc().setLyXView(lyx_view_);
 421         theLyXFunc().processKeySym(key, mod);
 422 }
 423
 424
 425 void GuiWorkArea::dispatch(FuncRequest const & cmd0, KeyModifier mod)
 426 {
 427         // Handle drag&drop
 428         if (cmd0.action == LFUN_FILE_OPEN) {
 429                 lyx_view_->dispatch(cmd0);
 430                 return;
 431         }
 432
 433         theLyXFunc().setLyXView(lyx_view_);
 434
 435         FuncRequest cmd;
 436
 437         if (cmd0.action == LFUN_MOUSE_PRESS) {
 438                 if (mod == ShiftModifier)
 439                         cmd = FuncRequest(cmd0, "region-select");
 440                 else if (mod == ControlModifier)
 441                         cmd = FuncRequest(cmd0, "paragraph-select");
 442                 else
 443                         cmd = cmd0;
 444         }
 445         else
 446                 cmd = cmd0;
 447
 448         bool const notJustMovingTheMouse =
 449                 cmd.action != LFUN_MOUSE_MOTION || cmd.button() != mouse_button::none;
 450
 451         // In order to avoid bad surprise in the middle of an operation, we better stop
 452         // the blinking cursor.
 453         if (notJustMovingTheMouse)
 454                 stopBlinkingCursor();
 455
 456         buffer_view_->mouseEventDispatch(cmd);
 457
 458         // Skip these when selecting
 459         if (cmd.action != LFUN_MOUSE_MOTION) {
 460                 completer_->updateVisibility(false, false);
 461                 lyx_view_->updateDialogs();
 462         }
 463
 464         // GUI tweaks except with mouse motion with no button pressed.
 465         if (notJustMovingTheMouse) {
 466                 // Slight hack: this is only called currently when we
 467                 // clicked somewhere, so we force through the display
 468                 // of the new status here.
 469                 lyx_view_->clearMessage();
 470
 471                 // Show the cursor immediately after any operation
 472                 startBlinkingCursor();
 473         }
 474 }
 475
 476
 477 void GuiWorkArea::resizeBufferView()
 478 {
 479         // WARNING: Please don't put any code that will trigger a repaint here!
 480         // We are already inside a paint event.
 481         lyx_view_->setBusy(true);
 482         buffer_view_->resize(viewport()->width(), viewport()->height());
 483         updateScreen();
 484
 485         // Update scrollbars which might have changed due different
 486         // BufferView dimension. This is especially important when the
 487         // BufferView goes from zero-size to the real-size for the first time,
 488         // as the scrollbar paramters are then set for the first time.
 489         updateScrollbar();
 490
 491         lyx_view_->updateLayoutList();
 492         lyx_view_->setBusy(false);
 493         need_resize_ = false;
 494 }
 495
 496
 497 void GuiWorkArea::showCursor()
 498 {
 499         if (cursor_visible_)
 500                 return;
 501
 502         // RTL or not RTL
 503         bool l_shape = false;
 504         Font const & realfont = buffer_view_->cursor().real_current_font;
 505         BufferParams const & bp = buffer_view_->buffer().params();
 506         bool const samelang = realfont.language() == bp.language;
 507         bool const isrtl = realfont.isVisibleRightToLeft();
 508
 509         if (!samelang || isrtl != bp.language->rightToLeft())
 510                 l_shape = true;
 511
 512         // The ERT language hack needs fixing up
 513         if (realfont.language() == latex_language)
 514                 l_shape = false;
 515
 516         Font const font = buffer_view_->cursor().getFont();
 517         FontMetrics const & fm = theFontMetrics(font);
 518         int const asc = fm.maxAscent();
 519         int const des = fm.maxDescent();
 520         int h = asc + des;
 521         int x = 0;
 522         int y = 0;
 523         Cursor & cur = buffer_view_->cursor();
 524         cur.getPos(x, y);
 525         y -= asc;
 526
 527         // if it doesn't touch the screen, don't try to show it
 528         bool cursorInView = true;
 529         if (y + h < 0 || y >= viewport()->height())
 530                 cursorInView = false;
 531
 532         // show cursor on screen
 533         bool completable = cur.inset().showCompletionCursor()
 534                 && completer_->completionAvailable()
 535                 && !completer_->popupVisible()
 536                 && !completer_->inlineVisible();
 537         if (cursorInView) {
 538                 cursor_visible_ = true;
 539                 showCursor(x, y, h, l_shape, isrtl, completable);
 540         }
 541 }
 542
 543
 544 void GuiWorkArea::hideCursor()
 545 {
 546         if (!cursor_visible_)
 547                 return;
 548
 549         cursor_visible_ = false;
 550         removeCursor();
 551 }
 552
 553
 554 void GuiWorkArea::toggleCursor()
 555 {
 556         if (cursor_visible_)
 557                 hideCursor();
 558         else
 559                 showCursor();
 560 }
 561
 562
 563 void GuiWorkArea::updateScrollbar()
 564 {
 565         ScrollbarParameters const & scroll_ = buffer_view_->scrollbarParameters();
 566
 567         // Block the scrollbar signal to prevent recursive signal/slot calling.
 568         verticalScrollBar()->blockSignals(true);
 569         verticalScrollBar()->setRange(scroll_.min, scroll_.max);
 570         verticalScrollBar()->setPageStep(scroll_.page_step);
 571         verticalScrollBar()->setSingleStep(scroll_.single_step);
 572         verticalScrollBar()->setValue(scroll_.position);
 573         verticalScrollBar()->setSliderPosition(scroll_.position);
 574         verticalScrollBar()->blockSignals(false);
 575 }
 576
 577
 578 void GuiWorkArea::scrollTo(int value)
 579 {
 580         stopBlinkingCursor();
 581         buffer_view_->scrollDocView(value);
 582
 583         if (lyxrc.cursor_follows_scrollbar) {
 584                 buffer_view_->setCursorFromScrollbar();
 585                 lyx_view_->updateLayoutList();
 586         }
 587         // Show the cursor immediately after any operation.
 588         startBlinkingCursor();
 589         QApplication::syncX();
 590 }
 591
 592
 593 bool GuiWorkArea::event(QEvent * e)
 594 {
 595         switch (e->type()) {
 596         case QEvent::ToolTip: {
 597                 QHelpEvent * helpEvent = static_cast<QHelpEvent *>(e);
 598                 if (lyxrc.use_tooltip) {
 599                         QPoint pos = helpEvent->pos();
 600                         if (pos.x() < viewport()->width()) {
 601                                 QString s = toqstr(buffer_view_->toolTip(pos.x(), pos.y()));
 602                                 QToolTip::showText(helpEvent->globalPos(), s);
 603                         }
 604                         else
 605                                 QToolTip::hideText();
 606                 }
 607                 // Don't forget to accept the event!
 608                 e->accept();
 609                 return true;
 610         }
 611
 612         case QEvent::ShortcutOverride: {
 613                 // We catch this event in order to catch the Tab or Shift+Tab key press
 614                 // which are otherwise reserved to focus switching between controls
 615                 // within a dialog.
 616                 QKeyEvent * ke = static_cast<QKeyEvent*>(e);
 617                 if ((ke->key() != Qt::Key_Tab && ke->key() != Qt::Key_Backtab)
 618                         || ke->modifiers() & Qt::ControlModifier)
 619                         return QAbstractScrollArea::event(e);
 620                 keyPressEvent(ke);
 621                 return true;
 622         }
 623
 624         default:
 625                 return QAbstractScrollArea::event(e);
 626         }
 627         return false;
 628 }
 629
 630
 631 void GuiWorkArea::contextMenuEvent(QContextMenuEvent * e)
 632 {
 633         QPoint pos = e->pos();
 634         docstring name = buffer_view_->contextMenu(pos.x(), pos.y());
 635         if (name.empty()) {
 636                 QAbstractScrollArea::contextMenuEvent(e);
 637                 return;
 638         }
 639         QMenu * menu = guiApp->menus().menu(toqstr(name), *lyx_view_);
 640         if (!menu) {
 641                 QAbstractScrollArea::contextMenuEvent(e);
 642                 return;
 643         }
 644         // Position the menu to the right.
 645         // FIXME: menu position should be different for RTL text.
 646         menu->exec(e->globalPos());
 647         e->accept();
 648 }
 649
 650
 651 void GuiWorkArea::focusInEvent(QFocusEvent * e)
 652 {
 653         if (lyx_view_->currentWorkArea() != this)
 654                 lyx_view_->setCurrentWorkArea(this);
 655
 656         // Repaint the whole screen.
 657         // Note: this is different from redraw() as only the backing pixmap
 658         // will be redrawn, which is cheap.
 659         viewport()->repaint();
 660
 661         startBlinkingCursor();
 662         QAbstractScrollArea::focusInEvent(e);
 663 }
 664
 665
 666 void GuiWorkArea::focusOutEvent(QFocusEvent * e)
 667 {
 668         stopBlinkingCursor();
 669         QAbstractScrollArea::focusOutEvent(e);
 670 }
 671
 672
 673 void GuiWorkArea::mousePressEvent(QMouseEvent * e)
 674 {
 675         if (dc_event_.active && dc_event_ == *e) {
 676                 dc_event_.active = false;
 677                 FuncRequest cmd(LFUN_MOUSE_TRIPLE, e->x(), e->y(),
 678                         q_button_state(e->button()));
 679                 dispatch(cmd);
 680                 e->accept();
 681                 return;
 682         }
 683
 684         inputContext()->reset();
 685
 686         FuncRequest const cmd(LFUN_MOUSE_PRESS, e->x(), e->y(),
 687                 q_button_state(e->button()));
 688         dispatch(cmd, q_key_state(e->modifiers()));
 689         e->accept();
 690 }
 691
 692
 693 void GuiWorkArea::mouseReleaseEvent(QMouseEvent * e)
 694 {
 695         if (synthetic_mouse_event_.timeout.running())
 696                 synthetic_mouse_event_.timeout.stop();
 697
 698         FuncRequest const cmd(LFUN_MOUSE_RELEASE, e->x(), e->y(),
 699                               q_button_state(e->button()));
 700         dispatch(cmd);
 701         e->accept();
 702 }
 703
 704
 705 void GuiWorkArea::mouseMoveEvent(QMouseEvent * e)
 706 {
 707         // we kill the triple click if we move
 708         doubleClickTimeout();
 709         FuncRequest cmd(LFUN_MOUSE_MOTION, e->x(), e->y(),
 710                 q_motion_state(e->buttons()));
 711
 712         e->accept();
 713
 714         // If we're above or below the work area...
 715         if (e->y() <= 20 || e->y() >= viewport()->height() - 20) {
 716                 // Make sure only a synthetic event can cause a page scroll,
 717                 // so they come at a steady rate:
 718                 if (e->y() <= 20)
 719                         // _Force_ a scroll up:
 720                         cmd.y = -40;
 721                 else
 722                         cmd.y = viewport()->height();
 723                 // Store the event, to be handled when the timeout expires.
 724                 synthetic_mouse_event_.cmd = cmd;
 725
 726                 if (synthetic_mouse_event_.timeout.running())
 727                         // Discard the event. Note that it _may_ be handled
 728                         // when the timeout expires if
 729                         // synthetic_mouse_event_.cmd has not been overwritten.
 730                         // Ie, when the timeout expires, we handle the
 731                         // most recent event but discard all others that
 732                         // occurred after the one used to start the timeout
 733                         // in the first place.
 734                         return;
 735
 736                 synthetic_mouse_event_.restart_timeout = true;
 737                 synthetic_mouse_event_.timeout.start();
 738                 // Fall through to handle this event...
 739
 740         } else if (synthetic_mouse_event_.timeout.running()) {
 741                 // Store the event, to be possibly handled when the timeout
 742                 // expires.
 743                 // Once the timeout has expired, normal control is returned
 744                 // to mouseMoveEvent (restart_timeout = false).
 745                 // This results in a much smoother 'feel' when moving the
 746                 // mouse back into the work area.
 747                 synthetic_mouse_event_.cmd = cmd;
 748                 synthetic_mouse_event_.restart_timeout = false;
 749                 return;
 750         }
 751
 752         // Has anything changed on-screen since the last QMouseEvent
 753         // was received?
 754         double const scrollbar_value = verticalScrollBar()->value();
 755         if (e->x() == synthetic_mouse_event_.x_old
 756                 && e->y() == synthetic_mouse_event_.y_old
 757                 && scrollbar_value == synthetic_mouse_event_.scrollbar_value_old) {
 758                 // Nothing changed on-screen since the last QMouseEvent.
 759                 return;
 760         }
 761
 762         // Yes something has changed. Store the params used to check this.
 763         synthetic_mouse_event_.x_old = e->x();
 764         synthetic_mouse_event_.y_old = e->y();
 765         synthetic_mouse_event_.scrollbar_value_old = scrollbar_value;
 766
 767         // ... and dispatch the event to the LyX core.
 768         dispatch(cmd);
 769 }
 770
 771
 772 void GuiWorkArea::wheelEvent(QWheelEvent * ev)
 773 {
 774         // Wheel rotation by one notch results in a delta() of 120 (see
 775         // documentation of QWheelEvent)
 776         int delta = ev->delta() / 120;
 777         if (ev->modifiers() & Qt::ControlModifier) {
 778                 lyxrc.zoom -= 5 * delta;
 779                 if (lyxrc.zoom < 10)
 780                         lyxrc.zoom = 10;
 781                 // The global QPixmapCache is used in GuiPainter to cache text
 782                 // painting so we must reset it.
 783                 QPixmapCache::clear();
 784                 guiApp->fontLoader().update();
 785                 lyx::dispatch(FuncRequest(LFUN_SCREEN_FONT_UPDATE));
 786         } else {
 787                 double const lines = qApp->wheelScrollLines()
 788                         * lyxrc.mouse_wheel_speed * delta;
 789                 LYXERR(Debug::SCROLLING, "wheelScrollLines = " << qApp->wheelScrollLines()
 790                         << " delta = " << ev->delta() << " lines = " << lines);
 791                 verticalScrollBar()->setValue(verticalScrollBar()->value() -
 792                         int(lines *  verticalScrollBar()->singleStep()));
 793         }
 794         ev->accept();
 795 }
 796
 797
 798 void GuiWorkArea::generateSyntheticMouseEvent()
 799 {
 800         // Set things off to generate the _next_ 'pseudo' event.
 801         if (synthetic_mouse_event_.restart_timeout)
 802                 synthetic_mouse_event_.timeout.start();
 803
 804         // Has anything changed on-screen since the last timeout signal
 805         // was received?
 806         double const scrollbar_value = verticalScrollBar()->value();
 807         if (scrollbar_value != synthetic_mouse_event_.scrollbar_value_old) {
 808                 // Yes it has. Store the params used to check this.
 809                 synthetic_mouse_event_.scrollbar_value_old = scrollbar_value;
 810
 811                 // ... and dispatch the event to the LyX core.
 812                 dispatch(synthetic_mouse_event_.cmd);
 813         }
 814 }
 815
 816
 817 void GuiWorkArea::keyPressEvent(QKeyEvent * ev)
 818 {
 819         // intercept some keys if completion popup is visible
 820         if (completer_->popupVisible()) {
 821                 switch (ev->key()) {
 822                 case Qt::Key_Enter:
 823                 case Qt::Key_Return:
 824                         completer_->activate();
 825                         ev->accept();
 826                         return;
 827                 }
 828         }
 829
 830         // intercept keys for the completion
 831         if (ev->key() == Qt::Key_Tab) {
 832                 completer_->tab();
 833                 ev->accept();
 834                 return;
 835         }
 836
 837         if (completer_->popupVisible() && ev->key() == Qt::Key_Escape) {
 838                 completer_->hidePopup();
 839                 ev->accept();
 840                 return;
 841         }
 842
 843         if (completer_->inlineVisible() && ev->key() == Qt::Key_Escape) {
 844                 completer_->hideInline();
 845                 ev->accept();
 846                 return;
 847         }
 848
 849         // do nothing if there are other events
 850         // (the auto repeated events come too fast)
 851         // \todo FIXME: remove hard coded Qt keys, process the key binding
 852 #ifdef Q_WS_X11
 853         if (XEventsQueued(QX11Info::display(), 0) > 1 && ev->isAutoRepeat()
 854                         && (Qt::Key_PageDown || Qt::Key_PageUp)) {
 855                 LYXERR(Debug::KEY, "system is busy: scroll key event ignored");
 856                 ev->ignore();
 857                 return;
 858         }
 859 #endif
 860
 861         LYXERR(Debug::KEY, " count: " << ev->count() << " text: " << ev->text()
 862                 << " isAutoRepeat: " << ev->isAutoRepeat() << " key: " << ev->key());
 863
 864         KeySymbol sym;
 865         setKeySymbol(&sym, ev);
 866         processKeySym(sym, q_key_state(ev->modifiers()));
 867         ev->accept();
 868 }
 869
 870
 871 void GuiWorkArea::doubleClickTimeout()
 872 {
 873         dc_event_.active = false;
 874 }
 875
 876
 877 void GuiWorkArea::mouseDoubleClickEvent(QMouseEvent * ev)
 878 {
 879         dc_event_ = DoubleClick(ev);
 880         QTimer::singleShot(QApplication::doubleClickInterval(), this,
 881                            SLOT(doubleClickTimeout()));
 882         FuncRequest cmd(LFUN_MOUSE_DOUBLE,
 883                         ev->x(), ev->y(),
 884                         q_button_state(ev->button()));
 885         dispatch(cmd);
 886         ev->accept();
 887 }
 888
 889
 890 void GuiWorkArea::resizeEvent(QResizeEvent * ev)
 891 {
 892         QAbstractScrollArea::resizeEvent(ev);
 893         need_resize_ = true;
 894         ev->accept();
 895 }
 896
 897
 898 void GuiWorkArea::update(int x, int y, int w, int h)
 899 {
 900         viewport()->repaint(x, y, w, h);
 901 }
 902
 903
 904 void GuiWorkArea::paintEvent(QPaintEvent * ev)
 905 {
 906         QRect const rc = ev->rect();
 907         // LYXERR(Debug::PAINTING, "paintEvent begin: x: " << rc.x()
 908         //      << " y: " << rc.y() << " w: " << rc.width() << " h: " << rc.height());
 909
 910         if (need_resize_) {
 911                 screen_ = QPixmap(viewport()->width(), viewport()->height());
 912                 resizeBufferView();
 913                 hideCursor();
 914                 showCursor();
 915         }
 916
 917         QPainter pain(viewport());
 918         pain.drawPixmap(rc, screen_, rc);
 919         cursor_->draw(pain);
 920         ev->accept();
 921 }
 922
 923
 924 void GuiWorkArea::updateScreen()
 925 {
 926         GuiPainter pain(&screen_);
 927         buffer_view_->draw(pain);
 928 }
 929
 930
 931 void GuiWorkArea::showCursor(int x, int y, int h,
 932         bool l_shape, bool rtl, bool completable)
 933 {
 934         if (schedule_redraw_) {
 935                 buffer_view_->updateMetrics();
 936                 updateScreen();
 937                 viewport()->update(QRect(0, 0, viewport()->width(), viewport()->height()));
 938                 schedule_redraw_ = false;
 939                 // Show the cursor immediately after the update.
 940                 hideCursor();
 941                 toggleCursor();
 942                 return;
 943         }
 944
 945         cursor_->update(x, y, h, l_shape, rtl, completable);
 946         cursor_->show();
 947         viewport()->update(cursor_->rect());
 948 }
 949
 950
 951 void GuiWorkArea::removeCursor()
 952 {
 953         cursor_->hide();
 954         //if (!qApp->focusWidget())
 955                 viewport()->update(cursor_->rect());
 956 }
 957
 958
 959 void GuiWorkArea::inputMethodEvent(QInputMethodEvent * e)
 960 {
 961         QString const & commit_string = e->commitString();
 962         docstring const & preedit_string
 963                 = qstring_to_ucs4(e->preeditString());
 964
 965         if (!commit_string.isEmpty()) {
 966
 967                 LYXERR(Debug::KEY, "preeditString: " << e->preeditString()
 968                         << " commitString: " << e->commitString());
 969
 970                 int key = 0;
 971
 972                 // FIXME Iwami 04/01/07: we should take care also of UTF16 surrogates here.
 973                 for (int i = 0; i != commit_string.size(); ++i) {
 974                         QKeyEvent ev(QEvent::KeyPress, key, Qt::NoModifier, commit_string[i]);
 975                         keyPressEvent(&ev);
 976                 }
 977         }
 978
 979         // Hide the cursor during the kana-kanji transformation.
 980         if (preedit_string.empty())
 981                 startBlinkingCursor();
 982         else
 983                 stopBlinkingCursor();
 984
 985         // last_width : for checking if last preedit string was/wasn't empty.
 986         static bool last_width = false;
 987         if (!last_width && preedit_string.empty()) {
 988                 // if last_width is last length of preedit string.
 989                 e->accept();
 990                 return;
 991         }
 992
 993         GuiPainter pain(&screen_);
 994         buffer_view_->updateMetrics();
 995         buffer_view_->draw(pain);
 996         FontInfo font = buffer_view_->cursor().getFont().fontInfo();
 997         FontMetrics const & fm = theFontMetrics(font);
 998         int height = fm.maxHeight();
 999         int cur_x = cursor_->rect().left();
1000         int cur_y = cursor_->rect().bottom();
1001
1002         // redraw area of preedit string.
1003         update(0, cur_y - height, viewport()->width(),
1004                 (height + 1) * preedit_lines_);
1005
1006         if (preedit_string.empty()) {
1007                 last_width = false;
1008                 preedit_lines_ = 1;
1009                 e->accept();
1010                 return;
1011         }
1012         last_width = true;
1013
1014         // att : stores an IM attribute.
1015         QList<QInputMethodEvent::Attribute> const & att = e->attributes();
1016
1017         // get attributes of input method cursor.
1018         // cursor_pos : cursor position in preedit string.
1019         size_t cursor_pos = 0;
1020         bool cursor_is_visible = false;
1021         for (int i = 0; i != att.size(); ++i) {
1022                 if (att.at(i).type == QInputMethodEvent::Cursor) {
1023                         cursor_pos = att.at(i).start;
1024                         cursor_is_visible = att.at(i).length != 0;
1025                         break;
1026                 }
1027         }
1028
1029         size_t preedit_length = preedit_string.length();
1030
1031         // get position of selection in input method.
1032         // FIXME: isn't there a way to do this simplier?
1033         // rStart : cursor position in selected string in IM.
1034         size_t rStart = 0;
1035         // rLength : selected string length in IM.
1036         size_t rLength = 0;
1037         if (cursor_pos < preedit_length) {
1038                 for (int i = 0; i != att.size(); ++i) {
1039                         if (att.at(i).type == QInputMethodEvent::TextFormat) {
1040                                 if (att.at(i).start <= int(cursor_pos)
1041                                         && int(cursor_pos) < att.at(i).start + att.at(i).length) {
1042                                                 rStart = att.at(i).start;
1043                                                 rLength = att.at(i).length;
1044                                                 if (!cursor_is_visible)
1045                                                         cursor_pos += rLength;
1046                                                 break;
1047                                 }
1048                         }
1049                 }
1050         }
1051         else {
1052                 rStart = cursor_pos;
1053                 rLength = 0;
1054         }
1055
1056         int const right_margin = buffer_view_->rightMargin();
1057         Painter::preedit_style ps;
1058         // Most often there would be only one line:
1059         preedit_lines_ = 1;
1060         for (size_t pos = 0; pos != preedit_length; ++pos) {
1061                 char_type const typed_char = preedit_string[pos];
1062                 // reset preedit string style
1063                 ps = Painter::preedit_default;
1064
1065                 // if we reached the right extremity of the screen, go to next line.
1066                 if (cur_x + fm.width(typed_char) > viewport()->width() - right_margin) {
1067                         cur_x = right_margin;
1068                         cur_y += height + 1;
1069                         ++preedit_lines_;
1070                 }
1071                 // preedit strings are displayed with dashed underline
1072                 // and partial strings are displayed white on black indicating
1073                 // that we are in selecting mode in the input method.
1074                 // FIXME: rLength == preedit_length is not a changing condition
1075                 // FIXME: should be put out of the loop.
1076                 if (pos >= rStart
1077                         && pos < rStart + rLength
1078                         && !(cursor_pos < rLength && rLength == preedit_length))
1079                         ps = Painter::preedit_selecting;
1080
1081                 if (pos == cursor_pos
1082                         && (cursor_pos < rLength && rLength == preedit_length))
1083                         ps = Painter::preedit_cursor;
1084
1085                 // draw one character and update cur_x.
1086                 cur_x += pain.preeditText(cur_x, cur_y, typed_char, font, ps);
1087         }
1088
1089         // update the preedit string screen area.
1090         update(0, cur_y - preedit_lines_*height, viewport()->width(),
1091                 (height + 1) * preedit_lines_);
1092
1093         // Don't forget to accept the event!
1094         e->accept();
1095 }
1096
1097
1098 QVariant GuiWorkArea::inputMethodQuery(Qt::InputMethodQuery query) const
1099 {
1100         QRect cur_r(0,0,0,0);
1101         switch (query) {
1102                 // this is the CJK-specific composition window position.
1103                 case Qt::ImMicroFocus:
1104                         cur_r = cursor_->rect();
1105                         if (preedit_lines_ != 1)
1106                                 cur_r.moveLeft(10);
1107                         cur_r.moveBottom(cur_r.bottom() + cur_r.height() * preedit_lines_);
1108                         // return lower right of cursor in LyX.
1109                         return cur_r;
1110                 default:
1111                         return QWidget::inputMethodQuery(query);
1112         }
1113 }
1114
1115
1116 void GuiWorkArea::updateWindowTitle()
1117 {
1118         docstring maximize_title;
1119         docstring minimize_title;
1120
1121         Buffer & buf = buffer_view_->buffer();
1122         FileName const fileName = buf.fileName();
1123         if (!fileName.empty()) {
1124                 maximize_title = fileName.displayName(30);
1125                 minimize_title = from_utf8(fileName.onlyFileName());
1126                 if (!buf.isClean()) {
1127                         maximize_title += _(" (changed)");
1128                         minimize_title += char_type('*');
1129                 }
1130                 if (buf.isReadonly())
1131                         maximize_title += _(" (read only)");
1132         }
1133
1134         QString title = windowTitle();
1135         QString new_title = toqstr(maximize_title);
1136         if (title == new_title)
1137                 return;
1138
1139         QWidget::setWindowTitle(new_title);
1140         QWidget::setWindowIconText(toqstr(minimize_title));
1141         titleChanged(this);
1142 }
1143
1144
1145 void GuiWorkArea::setReadOnly(bool)
1146 {
1147         updateWindowTitle();
1148         if (this == lyx_view_->currentWorkArea())
1149                 lyx_view_->updateDialogs();
1150 }
1151
1152
1153 bool GuiWorkArea::isFullScreen()
1154 {
1155         return lyx_view_ && lyx_view_->isFullScreen();
1156 }
1157
1158
1159 ////////////////////////////////////////////////////////////////////
1160 //
1161 // TabWorkArea
1162 //
1163 ////////////////////////////////////////////////////////////////////
1164
1165 #ifdef Q_WS_MACX
1166 class NoTabFrameMacStyle : public QMacStyle {
1167 public:
1168         ///
1169         QRect subElementRect(SubElement element, const QStyleOption * option,
1170                              const QWidget * widget = 0) const
1171         {
1172                 QRect rect = QMacStyle::subElementRect(element, option, widget);
1173                 bool noBar = static_cast<QTabWidget const *>(widget)->count() <= 1;
1174
1175                 // The Qt Mac style puts the contents into a 3 pixel wide box
1176                 // which looks very ugly and not like other Mac applications.
1177                 // Hence we remove this here, and moreover the 16 pixel round
1178                 // frame above if the tab bar is hidden.
1179                 if (element == QStyle::SE_TabWidgetTabContents) {
1180                         rect.adjust(- rect.left(), 0, rect.left(), 0);
1181                         if (noBar)
1182                                 rect.setTop(0);
1183                 }
1184
1185                 return rect;
1186         }
1187 };
1188
1189 NoTabFrameMacStyle noTabFrameMacStyle;
1190 #endif
1191
1192
1193 TabWorkArea::TabWorkArea(QWidget * parent)
1194         : QTabWidget(parent), clicked_tab_(-1)
1195 {
1196 #ifdef Q_WS_MACX
1197         setStyle(&noTabFrameMacStyle);
1198 #endif
1199
1200         QPalette pal = palette();
1201         pal.setColor(QPalette::Active, QPalette::Button,
1202                 pal.color(QPalette::Active, QPalette::Window));
1203         pal.setColor(QPalette::Disabled, QPalette::Button,
1204                 pal.color(QPalette::Disabled, QPalette::Window));
1205         pal.setColor(QPalette::Inactive, QPalette::Button,
1206                 pal.color(QPalette::Inactive, QPalette::Window));
1207
1208         QObject::connect(this, SIGNAL(currentChanged(int)),
1209                 this, SLOT(on_currentTabChanged(int)));
1210
1211         QToolButton * closeBufferButton = new QToolButton(this);
1212         closeBufferButton->setPalette(pal);
1213         // FIXME: rename the icon to closebuffer.png
1214         closeBufferButton->setIcon(QIcon(":/images/closetab.png"));
1215         closeBufferButton->setText("Close File");
1216         closeBufferButton->setAutoRaise(true);
1217         closeBufferButton->setCursor(Qt::ArrowCursor);
1218         closeBufferButton->setToolTip(qt_("Close File"));
1219         closeBufferButton->setEnabled(true);
1220         QObject::connect(closeBufferButton, SIGNAL(clicked()),
1221                 this, SLOT(closeCurrentBuffer()));
1222         setCornerWidget(closeBufferButton, Qt::TopRightCorner);
1223
1224         // setup drag'n'drop
1225         QTabBar* tb = new DragTabBar;
1226         connect(tb, SIGNAL(tabMoveRequested(int, int)),
1227                 this, SLOT(moveTab(int, int)));
1228         tb->setElideMode(Qt::ElideNone);
1229         setTabBar(tb);
1230
1231         // make us responsible for the context menu of the tabbar
1232         tb->setContextMenuPolicy(Qt::CustomContextMenu);
1233         connect(tb, SIGNAL(customContextMenuRequested(const QPoint &)),
1234                 this, SLOT(showContextMenu(const QPoint &)));
1235
1236         setUsesScrollButtons(true);
1237 }
1238
1239
1240 void TabWorkArea::setFullScreen(bool full_screen)
1241 {
1242         for (int i = 0; i != count(); ++i) {
1243                 if (GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i)))
1244                         wa->setFullScreen(full_screen);
1245         }
1246
1247         if (lyxrc.full_screen_tabbar)
1248                 showBar(!full_screen && count()>1);
1249 }
1250
1251
1252 void TabWorkArea::showBar(bool show)
1253 {
1254         tabBar()->setEnabled(show);
1255         tabBar()->setVisible(show);
1256 }
1257
1258
1259 GuiWorkArea * TabWorkArea::currentWorkArea()
1260 {
1261         if (count() == 0)
1262                 return 0;
1263
1264         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(currentWidget());
1265         LASSERT(wa, /**/);
1266         return wa;
1267 }
1268
1269
1270 GuiWorkArea * TabWorkArea::workArea(Buffer & buffer)
1271 {
1272         for (int i = 0; i != count(); ++i) {
1273                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i));
1274                 LASSERT(wa, return 0);
1275                 if (&wa->bufferView().buffer() == &buffer)
1276                         return wa;
1277         }
1278         return 0;
1279 }
1280
1281
1282 void TabWorkArea::closeAll()
1283 {
1284         while (count()) {
1285                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(0));
1286                 LASSERT(wa, /**/);
1287                 removeTab(0);
1288                 delete wa;
1289         }
1290 }
1291
1292
1293 bool TabWorkArea::setCurrentWorkArea(GuiWorkArea * work_area)
1294 {
1295         LASSERT(work_area, /**/);
1296         int index = indexOf(work_area);
1297         if (index == -1)
1298                 return false;
1299
1300         if (index == currentIndex())
1301                 // Make sure the work area is up to date.
1302                 on_currentTabChanged(index);
1303         else
1304                 // Switch to the work area.
1305                 setCurrentIndex(index);
1306         work_area->setFocus();
1307
1308         return true;
1309 }
1310
1311
1312 GuiWorkArea * TabWorkArea::addWorkArea(Buffer & buffer, GuiView & view)
1313 {
1314         GuiWorkArea * wa = new GuiWorkArea(buffer, view);
1315         wa->setUpdatesEnabled(false);
1316         // Hide tabbar if there's no tab (avoid a resize and a flashing tabbar
1317         // when hiding it again below).
1318         if (!(currentWorkArea() && currentWorkArea()->isFullScreen()))
1319                 showBar(count() > 0);
1320         addTab(wa, wa->windowTitle());
1321         QObject::connect(wa, SIGNAL(titleChanged(GuiWorkArea *)),
1322                 this, SLOT(updateTabTexts()));
1323         if (currentWorkArea() && currentWorkArea()->isFullScreen())
1324                 setFullScreen(true);
1325         else
1326                 // Hide tabbar if there's only one tab.
1327                 showBar(count() > 1);
1328
1329         updateTabTexts();
1330
1331         return wa;
1332 }
1333
1334
1335 bool TabWorkArea::removeWorkArea(GuiWorkArea * work_area)
1336 {
1337         LASSERT(work_area, return false);
1338         int index = indexOf(work_area);
1339         if (index == -1)
1340                 return false;
1341
1342         work_area->setUpdatesEnabled(false);
1343         removeTab(index);
1344         delete work_area;
1345
1346         if (count()) {
1347                 // make sure the next work area is enabled.
1348                 currentWidget()->setUpdatesEnabled(true);
1349                 if (currentWorkArea() && currentWorkArea()->isFullScreen())
1350                         setFullScreen(true);
1351                 else
1352                         // Hide tabbar if there's only one tab.
1353                         showBar(count() > 1);
1354         } else {
1355                 lastWorkAreaRemoved();
1356         }
1357
1358         updateTabTexts();
1359
1360         return true;
1361 }
1362
1363
1364 void TabWorkArea::on_currentTabChanged(int i)
1365 {
1366         // returns e.g. on application destruction
1367         if (i == -1)
1368                 return;
1369         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i));
1370         LASSERT(wa, return);
1371         BufferView & bv = wa->bufferView();
1372         bv.cursor().fixIfBroken();
1373         bv.updateMetrics();
1374         wa->setUpdatesEnabled(true);
1375         wa->redraw();
1376         wa->setFocus();
1377         ///
1378         currentWorkAreaChanged(wa);
1379
1380         LYXERR(Debug::GUI, "currentTabChanged " << i
1381                 << "File" << bv.buffer().absFileName());
1382 }
1383
1384
1385 void TabWorkArea::closeCurrentBuffer()
1386 {
1387         if (clicked_tab_ != -1)
1388                 setCurrentIndex(clicked_tab_);
1389
1390         lyx::dispatch(FuncRequest(LFUN_BUFFER_CLOSE));
1391 }
1392
1393
1394 void TabWorkArea::closeCurrentTab()
1395 {
1396         if (clicked_tab_ == -1)
1397                 removeWorkArea(currentWorkArea());
1398         else {
1399                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(clicked_tab_));
1400                 LASSERT(wa, /**/);
1401                 removeWorkArea(wa);
1402         }
1403 }
1404
1405 ///
1406 class DisplayPath {
1407 public:
1408         /// make vector happy
1409         DisplayPath() {}
1410         ///
1411         DisplayPath(int tab, FileName const & filename)
1412                 : tab_(tab)
1413         {
1414                 filename_ = toqstr(filename.onlyFileNameWithoutExt());
1415                 postfix_ = toqstr(filename.absoluteFilePath()).
1416                         split("/", QString::SkipEmptyParts);
1417                 postfix_.pop_back();
1418                 abs_ = toqstr(filename.absoluteFilePath());
1419                 dottedPrefix_ = false;
1420         }
1421
1422         /// Absolute path for debugging.
1423         QString abs() const
1424         {
1425                 return abs_;
1426         }
1427         /// Add the first segment from the postfix or three dots to the prefix.
1428         /// Merge multiple dot tripples. In fact dots are added lazily, i.e. only
1429         /// when really needed.
1430         void shiftPathSegment(bool dotted)
1431         {
1432                 if (postfix_.count() <= 0)
1433                         return;
1434
1435                 if (!dotted) {
1436                         if (dottedPrefix_ && !prefix_.isEmpty())
1437                                 prefix_ += ".../";
1438                         prefix_ += postfix_.front() + "/";
1439                 }
1440                 dottedPrefix_ = dotted && !prefix_.isEmpty();
1441                 postfix_.pop_front();
1442         }
1443         ///
1444         QString displayString() const
1445         {
1446                 if (prefix_.isEmpty())
1447                         return filename_;
1448
1449                 bool dots = dottedPrefix_ || !postfix_.isEmpty();
1450                 return prefix_ + (dots ? ".../" : "") + filename_;
1451         }
1452         ///
1453         QString forecastPathString() const
1454         {
1455                 if (postfix_.count() == 0)
1456                         return displayString();
1457
1458                 return prefix_
1459                         + (dottedPrefix_ ? ".../" : "")
1460                         + postfix_.front() + "/";
1461         }
1462         ///
1463         bool final() const { return postfix_.empty(); }
1464         ///
1465         int tab() const { return tab_; }
1466
1467 private:
1468         ///
1469         QString prefix_;
1470         ///
1471         QStringList postfix_;
1472         ///
1473         QString filename_;
1474         ///
1475         QString abs_;
1476         ///
1477         int tab_;
1478         ///
1479         bool dottedPrefix_;
1480 };
1481
1482
1483 ///
1484 bool operator<(DisplayPath const & a, DisplayPath const & b)
1485 {
1486         return a.displayString() < b.displayString();
1487 }
1488
1489 ///
1490 bool operator==(DisplayPath const & a, DisplayPath const & b)
1491 {
1492         return a.displayString() == b.displayString();
1493 }
1494
1495
1496 void TabWorkArea::updateTabTexts()
1497 {
1498         size_t n = count();
1499         if (n == 0)
1500                 return;
1501         std::list<DisplayPath> paths;
1502         typedef std::list<DisplayPath>::iterator It;
1503
1504         // collect full names first: path into postfix, empty prefix and
1505         // filename without extension
1506         for (size_t i = 0; i < n; ++i) {
1507                 GuiWorkArea * i_wa = dynamic_cast<GuiWorkArea *>(widget(i));
1508                 FileName const fn = i_wa->bufferView().buffer().fileName();
1509                 paths.push_back(DisplayPath(i, fn));
1510         }
1511
1512         // go through path segments and see if it helps to make the path more unique
1513         bool somethingChanged = true;
1514         bool allFinal = false;
1515         while (somethingChanged && !allFinal) {
1516                 // adding path segments changes order
1517                 paths.sort();
1518
1519                 LYXERR(Debug::GUI, "updateTabTexts() iteration start");
1520                 somethingChanged = false;
1521                 allFinal = true;
1522
1523                 // find segments which are not unique (i.e. non-atomic)
1524                 It it = paths.begin();
1525                 It segStart = it;
1526                 QString segString = it->displayString();
1527                 for (; it != paths.end(); ++it) {
1528                         // look to the next item
1529                         It next = it;
1530                         ++next;
1531
1532                         // final?
1533                         allFinal = allFinal && it->final();
1534
1535                         LYXERR(Debug::GUI, "it = " << it->abs()
1536                                << " => " << it->displayString());
1537
1538                         // still the same segment?
1539                         QString nextString;
1540                         if ((next != paths.end()
1541                              && (nextString = next->displayString()) == segString))
1542                                 continue;
1543                         LYXERR(Debug::GUI, "segment ended");
1544
1545                         // only a trivial one with one element?
1546                         if (it == segStart) {
1547                                 // start new segment
1548                                 segStart = next;
1549                                 segString = nextString;
1550                                 continue;
1551                         }
1552
1553                         // we found a non-atomic segment segStart <= sit <= it < next.
1554                         // Shift path segments and hope for the best
1555                         // that it makes the path more unique.
1556                         somethingChanged = true;
1557                         It sit = segStart;
1558                         QString dspString = sit->forecastPathString();
1559                         LYXERR(Debug::GUI, "first forecast found for "
1560                                << sit->abs() << " => " << dspString);
1561                         ++sit;
1562                         bool moreUnique = false;
1563                         for (; sit != next; ++sit) {
1564                                 if (sit->forecastPathString() != dspString) {
1565                                         LYXERR(Debug::GUI, "different forecast found for "
1566                                                 << sit->abs() << " => " << sit->forecastPathString());
1567                                         moreUnique = true;
1568                                         break;
1569                                 }
1570                                 LYXERR(Debug::GUI, "same forecast found for "
1571                                         << sit->abs() << " => " << dspString);
1572                         }
1573
1574                         // if the path segment helped, add it. Otherwise add dots
1575                         bool dots = !moreUnique;
1576                         LYXERR(Debug::GUI, "using dots = " << dots);
1577                         for (sit = segStart; sit != next; ++sit) {
1578                                 sit->shiftPathSegment(dots);
1579                                 LYXERR(Debug::GUI, "shifting "
1580                                         << sit->abs() << " => " << sit->displayString());
1581                         }
1582
1583                         // start new segment
1584                         segStart = next;
1585                         segString = nextString;
1586                 }
1587         }
1588
1589         // set new tab titles
1590         for (It it = paths.begin(); it != paths.end(); ++it) {
1591                 GuiWorkArea * i_wa = dynamic_cast<GuiWorkArea *>(widget(it->tab()));
1592                 Buffer & buf = i_wa->bufferView().buffer();
1593                 if (!buf.fileName().empty() && !buf.isClean())
1594                         setTabText(it->tab(), it->displayString() + "*");
1595                 else
1596                         setTabText(it->tab(), it->displayString());
1597         }
1598 }
1599
1600
1601 void TabWorkArea::showContextMenu(const QPoint & pos)
1602 {
1603         // which tab?
1604         clicked_tab_ = static_cast<DragTabBar *>(tabBar())->tabAt(pos);
1605         if (clicked_tab_ == -1)
1606                 return;
1607
1608         // show tab popup
1609         QMenu popup;
1610         popup.addAction(QIcon(":/images/hidetab.png"),
1611                 qt_("Hide tab"), this, SLOT(closeCurrentTab()));
1612         popup.addAction(QIcon(":/images/closetab.png"),
1613                 qt_("Close tab"), this, SLOT(closeCurrentBuffer()));
1614         popup.exec(tabBar()->mapToGlobal(pos));
1615
1616         clicked_tab_ = -1;
1617 }
1618
1619
1620 void TabWorkArea::moveTab(int fromIndex, int toIndex)
1621 {
1622         QWidget * w = widget(fromIndex);
1623         QIcon icon = tabIcon(fromIndex);
1624         QString text = tabText(fromIndex);
1625
1626         setCurrentIndex(fromIndex);
1627         removeTab(fromIndex);
1628         insertTab(toIndex, w, icon, text);
1629         setCurrentIndex(toIndex);
1630 }
1631
1632
1633 DragTabBar::DragTabBar(QWidget* parent)
1634         : QTabBar(parent)
1635 {
1636         setAcceptDrops(true);
1637 }
1638
1639
1640 #if QT_VERSION < 0x040300
1641 int DragTabBar::tabAt(QPoint const & position) const
1642 {
1643         const int max = count();
1644         for (int i = 0; i < max; ++i) {
1645                 if (tabRect(i).contains(position))
1646                         return i;
1647         }
1648         return -1;
1649 }
1650 #endif
1651
1652
1653 void DragTabBar::mousePressEvent(QMouseEvent * event)
1654 {
1655         if (event->button() == Qt::LeftButton)
1656                 dragStartPos_ = event->pos();
1657         QTabBar::mousePressEvent(event);
1658 }
1659
1660
1661 void DragTabBar::mouseMoveEvent(QMouseEvent * event)
1662 {
1663         // If the left button isn't pressed anymore then return
1664         if (!(event->buttons() & Qt::LeftButton))
1665                 return;
1666
1667         // If the distance is too small then return
1668         if ((event->pos() - dragStartPos_).manhattanLength()
1669             < QApplication::startDragDistance())
1670                 return;
1671
1672         // did we hit something after all?
1673         int tab = tabAt(dragStartPos_);
1674         if (tab == -1)
1675                 return;
1676
1677         // simulate button release to remove highlight from button
1678         int i = currentIndex();
1679         QMouseEvent me(QEvent::MouseButtonRelease, dragStartPos_,
1680                 event->button(), event->buttons(), 0);
1681         QTabBar::mouseReleaseEvent(&me);
1682         setCurrentIndex(i);
1683
1684         // initiate Drag
1685         QDrag * drag = new QDrag(this);
1686         QMimeData * mimeData = new QMimeData;
1687         // a crude way to distinguish tab-reodering drops from other ones
1688         mimeData->setData("action", "tab-reordering") ;
1689         drag->setMimeData(mimeData);
1690
1691 #if QT_VERSION >= 0x040300
1692         // get tab pixmap as cursor
1693         QRect r = tabRect(tab);
1694         QPixmap pixmap(r.size());
1695         render(&pixmap, - r.topLeft());
1696         drag->setPixmap(pixmap);
1697         drag->exec();
1698 #else
1699         drag->start(Qt::MoveAction);
1700 #endif
1701
1702 }
1703
1704
1705 void DragTabBar::dragEnterEvent(QDragEnterEvent * event)
1706 {
1707         // Only accept if it's an tab-reordering request
1708         QMimeData const * m = event->mimeData();
1709         QStringList formats = m->formats();
1710         if (formats.contains("action")
1711             && m->data("action") == "tab-reordering")
1712                 event->acceptProposedAction();
1713 }
1714
1715
1716 void DragTabBar::dropEvent(QDropEvent * event)
1717 {
1718         int fromIndex = tabAt(dragStartPos_);
1719         int toIndex = tabAt(event->pos());
1720
1721         // Tell interested objects that
1722         if (fromIndex != toIndex)
1723                 tabMoveRequested(fromIndex, toIndex);
1724         event->acceptProposedAction();
1725 }
1726
1727
1728 } // namespace frontend
1729 } // namespace lyx
1730
1731 #include "GuiWorkArea_moc.cpp"