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         theLyXFunc().setLyXView(lyx_view_);
 415         theLyXFunc().processKeySym(key, mod);
 416 }
 417
 418
 419 void GuiWorkArea::dispatch(FuncRequest const & cmd0, KeyModifier mod)
 420 {
 421         // Handle drag&drop
 422         if (cmd0.action == LFUN_FILE_OPEN) {
 423                 lyx_view_->dispatch(cmd0);
 424                 return;
 425         }
 426
 427         theLyXFunc().setLyXView(lyx_view_);
 428
 429         FuncRequest cmd;
 430
 431         if (cmd0.action == LFUN_MOUSE_PRESS) {
 432                 if (mod == ShiftModifier)
 433                         cmd = FuncRequest(cmd0, "region-select");
 434                 else if (mod == ControlModifier)
 435                         cmd = FuncRequest(cmd0, "paragraph-select");
 436                 else
 437                         cmd = cmd0;
 438         }
 439         else
 440                 cmd = cmd0;
 441
 442         bool const notJustMovingTheMouse =
 443                 cmd.action != LFUN_MOUSE_MOTION || cmd.button() != mouse_button::none;
 444
 445         // In order to avoid bad surprise in the middle of an operation, we better stop
 446         // the blinking cursor.
 447         if (notJustMovingTheMouse)
 448                 stopBlinkingCursor();
 449
 450         buffer_view_->mouseEventDispatch(cmd);
 451
 452         // Skip these when selecting
 453         if (cmd.action != LFUN_MOUSE_MOTION) {
 454                 completer_->updateVisibility(false, false);
 455                 lyx_view_->updateDialogs();
 456         }
 457
 458         // GUI tweaks except with mouse motion with no button pressed.
 459         if (notJustMovingTheMouse) {
 460                 // Slight hack: this is only called currently when we
 461                 // clicked somewhere, so we force through the display
 462                 // of the new status here.
 463                 lyx_view_->clearMessage();
 464
 465                 // Show the cursor immediately after any operation
 466                 startBlinkingCursor();
 467         }
 468 }
 469
 470
 471 void GuiWorkArea::resizeBufferView()
 472 {
 473         // WARNING: Please don't put any code that will trigger a repaint here!
 474         // We are already inside a paint event.
 475         lyx_view_->setBusy(true);
 476         buffer_view_->resize(viewport()->width(), viewport()->height());
 477         updateScreen();
 478
 479         // Update scrollbars which might have changed due different
 480         // BufferView dimension. This is especially important when the
 481         // BufferView goes from zero-size to the real-size for the first time,
 482         // as the scrollbar paramters are then set for the first time.
 483         updateScrollbar();
 484
 485         lyx_view_->updateLayoutList();
 486         lyx_view_->setBusy(false);
 487         need_resize_ = false;
 488 }
 489
 490
 491 void GuiWorkArea::showCursor()
 492 {
 493         if (cursor_visible_)
 494                 return;
 495
 496         // RTL or not RTL
 497         bool l_shape = false;
 498         Font const & realfont = buffer_view_->cursor().real_current_font;
 499         BufferParams const & bp = buffer_view_->buffer().params();
 500         bool const samelang = realfont.language() == bp.language;
 501         bool const isrtl = realfont.isVisibleRightToLeft();
 502
 503         if (!samelang || isrtl != bp.language->rightToLeft())
 504                 l_shape = true;
 505
 506         // The ERT language hack needs fixing up
 507         if (realfont.language() == latex_language)
 508                 l_shape = false;
 509
 510         Font const font = buffer_view_->cursor().getFont();
 511         FontMetrics const & fm = theFontMetrics(font);
 512         int const asc = fm.maxAscent();
 513         int const des = fm.maxDescent();
 514         int h = asc + des;
 515         int x = 0;
 516         int y = 0;
 517         Cursor & cur = buffer_view_->cursor();
 518         cur.getPos(x, y);
 519         y -= asc;
 520
 521         // if it doesn't touch the screen, don't try to show it
 522         bool cursorInView = true;
 523         if (y + h < 0 || y >= viewport()->height())
 524                 cursorInView = false;
 525
 526         // show cursor on screen
 527         bool completable = cur.inset().showCompletionCursor()
 528                 && completer_->completionAvailable()
 529                 && !completer_->popupVisible()
 530                 && !completer_->inlineVisible();
 531         if (cursorInView) {
 532                 cursor_visible_ = true;
 533                 showCursor(x, y, h, l_shape, isrtl, completable);
 534         }
 535 }
 536
 537
 538 void GuiWorkArea::hideCursor()
 539 {
 540         if (!cursor_visible_)
 541                 return;
 542
 543         cursor_visible_ = false;
 544         removeCursor();
 545 }
 546
 547
 548 void GuiWorkArea::toggleCursor()
 549 {
 550         if (cursor_visible_)
 551                 hideCursor();
 552         else
 553                 showCursor();
 554 }
 555
 556
 557 void GuiWorkArea::updateScrollbar()
 558 {
 559         ScrollbarParameters const & scroll_ = buffer_view_->scrollbarParameters();
 560
 561         // Block the scrollbar signal to prevent recursive signal/slot calling.
 562         verticalScrollBar()->blockSignals(true);
 563         verticalScrollBar()->setRange(scroll_.min, scroll_.max);
 564         verticalScrollBar()->setPageStep(scroll_.page_step);
 565         verticalScrollBar()->setSingleStep(scroll_.single_step);
 566         verticalScrollBar()->setValue(scroll_.position);
 567         verticalScrollBar()->setSliderPosition(scroll_.position);
 568         verticalScrollBar()->blockSignals(false);
 569 }
 570
 571
 572 void GuiWorkArea::scrollTo(int value)
 573 {
 574         stopBlinkingCursor();
 575         buffer_view_->scrollDocView(value);
 576
 577         if (lyxrc.cursor_follows_scrollbar) {
 578                 buffer_view_->setCursorFromScrollbar();
 579                 lyx_view_->updateLayoutList();
 580         }
 581         // Show the cursor immediately after any operation.
 582         startBlinkingCursor();
 583         QApplication::syncX();
 584 }
 585
 586
 587 bool GuiWorkArea::event(QEvent * e)
 588 {
 589         switch (e->type()) {
 590         case QEvent::ToolTip: {
 591                 QHelpEvent * helpEvent = static_cast<QHelpEvent *>(e);
 592                 if (lyxrc.use_tooltip) {
 593                         QPoint pos = helpEvent->pos();
 594                         if (pos.x() < viewport()->width()) {
 595                                 QString s = toqstr(buffer_view_->toolTip(pos.x(), pos.y()));
 596                                 QToolTip::showText(helpEvent->globalPos(), s);
 597                         }
 598                         else
 599                                 QToolTip::hideText();
 600                 }
 601                 // Don't forget to accept the event!
 602                 e->accept();
 603                 return true;
 604         }
 605
 606         case QEvent::ShortcutOverride: {
 607                 // We catch this event in order to catch the Tab or Shift+Tab key press
 608                 // which are otherwise reserved to focus switching between controls
 609                 // within a dialog.
 610                 QKeyEvent * ke = static_cast<QKeyEvent*>(e);
 611                 if ((ke->key() != Qt::Key_Tab && ke->key() != Qt::Key_Backtab)
 612                         || ke->modifiers() & Qt::ControlModifier)
 613                         return QAbstractScrollArea::event(e);
 614                 keyPressEvent(ke);
 615                 return true;
 616         }
 617
 618         default:
 619                 return QAbstractScrollArea::event(e);
 620         }
 621         return false;
 622 }
 623
 624
 625 void GuiWorkArea::contextMenuEvent(QContextMenuEvent * e)
 626 {
 627         QPoint pos = e->pos();
 628         docstring name = buffer_view_->contextMenu(pos.x(), pos.y());
 629         if (name.empty()) {
 630                 QAbstractScrollArea::contextMenuEvent(e);
 631                 return;
 632         }
 633         QMenu * menu = guiApp->menus().menu(toqstr(name), *lyx_view_);
 634         if (!menu) {
 635                 QAbstractScrollArea::contextMenuEvent(e);
 636                 return;
 637         }
 638         // Position the menu to the right.
 639         // FIXME: menu position should be different for RTL text.
 640         menu->exec(e->globalPos());
 641         e->accept();
 642 }
 643
 644
 645 void GuiWorkArea::focusInEvent(QFocusEvent * e)
 646 {
 647         if (lyx_view_->currentWorkArea() != this)
 648                 lyx_view_->setCurrentWorkArea(this);
 649
 650         // Repaint the whole screen.
 651         // Note: this is different from redraw() as only the backing pixmap
 652         // will be redrawn, which is cheap.
 653         viewport()->repaint();
 654
 655         startBlinkingCursor();
 656         QAbstractScrollArea::focusInEvent(e);
 657 }
 658
 659
 660 void GuiWorkArea::focusOutEvent(QFocusEvent * e)
 661 {
 662         stopBlinkingCursor();
 663         QAbstractScrollArea::focusOutEvent(e);
 664 }
 665
 666
 667 void GuiWorkArea::mousePressEvent(QMouseEvent * e)
 668 {
 669         if (dc_event_.active && dc_event_ == *e) {
 670                 dc_event_.active = false;
 671                 FuncRequest cmd(LFUN_MOUSE_TRIPLE, e->x(), e->y(),
 672                         q_button_state(e->button()));
 673                 dispatch(cmd);
 674                 e->accept();
 675                 return;
 676         }
 677
 678         inputContext()->reset();
 679
 680         FuncRequest const cmd(LFUN_MOUSE_PRESS, e->x(), e->y(),
 681                 q_button_state(e->button()));
 682         dispatch(cmd, q_key_state(e->modifiers()));
 683         e->accept();
 684 }
 685
 686
 687 void GuiWorkArea::mouseReleaseEvent(QMouseEvent * e)
 688 {
 689         if (synthetic_mouse_event_.timeout.running())
 690                 synthetic_mouse_event_.timeout.stop();
 691
 692         FuncRequest const cmd(LFUN_MOUSE_RELEASE, e->x(), e->y(),
 693                               q_button_state(e->button()));
 694         dispatch(cmd);
 695         e->accept();
 696 }
 697
 698
 699 void GuiWorkArea::mouseMoveEvent(QMouseEvent * e)
 700 {
 701         // we kill the triple click if we move
 702         doubleClickTimeout();
 703         FuncRequest cmd(LFUN_MOUSE_MOTION, e->x(), e->y(),
 704                 q_motion_state(e->buttons()));
 705
 706         e->accept();
 707
 708         // If we're above or below the work area...
 709         if (e->y() <= 20 || e->y() >= viewport()->height() - 20) {
 710                 // Make sure only a synthetic event can cause a page scroll,
 711                 // so they come at a steady rate:
 712                 if (e->y() <= 20)
 713                         // _Force_ a scroll up:
 714                         cmd.y = -40;
 715                 else
 716                         cmd.y = viewport()->height();
 717                 // Store the event, to be handled when the timeout expires.
 718                 synthetic_mouse_event_.cmd = cmd;
 719
 720                 if (synthetic_mouse_event_.timeout.running())
 721                         // Discard the event. Note that it _may_ be handled
 722                         // when the timeout expires if
 723                         // synthetic_mouse_event_.cmd has not been overwritten.
 724                         // Ie, when the timeout expires, we handle the
 725                         // most recent event but discard all others that
 726                         // occurred after the one used to start the timeout
 727                         // in the first place.
 728                         return;
 729
 730                 synthetic_mouse_event_.restart_timeout = true;
 731                 synthetic_mouse_event_.timeout.start();
 732                 // Fall through to handle this event...
 733
 734         } else if (synthetic_mouse_event_.timeout.running()) {
 735                 // Store the event, to be possibly handled when the timeout
 736                 // expires.
 737                 // Once the timeout has expired, normal control is returned
 738                 // to mouseMoveEvent (restart_timeout = false).
 739                 // This results in a much smoother 'feel' when moving the
 740                 // mouse back into the work area.
 741                 synthetic_mouse_event_.cmd = cmd;
 742                 synthetic_mouse_event_.restart_timeout = false;
 743                 return;
 744         }
 745
 746         // Has anything changed on-screen since the last QMouseEvent
 747         // was received?
 748         double const scrollbar_value = verticalScrollBar()->value();
 749         if (e->x() == synthetic_mouse_event_.x_old
 750                 && e->y() == synthetic_mouse_event_.y_old
 751                 && scrollbar_value == synthetic_mouse_event_.scrollbar_value_old) {
 752                 // Nothing changed on-screen since the last QMouseEvent.
 753                 return;
 754         }
 755
 756         // Yes something has changed. Store the params used to check this.
 757         synthetic_mouse_event_.x_old = e->x();
 758         synthetic_mouse_event_.y_old = e->y();
 759         synthetic_mouse_event_.scrollbar_value_old = scrollbar_value;
 760
 761         // ... and dispatch the event to the LyX core.
 762         dispatch(cmd);
 763 }
 764
 765
 766 void GuiWorkArea::wheelEvent(QWheelEvent * ev)
 767 {
 768         // Wheel rotation by one notch results in a delta() of 120 (see
 769         // documentation of QWheelEvent)
 770         int delta = ev->delta() / 120;
 771         if (ev->modifiers() & Qt::ControlModifier) {
 772                 lyxrc.zoom -= 5 * delta;
 773                 if (lyxrc.zoom < 10)
 774                         lyxrc.zoom = 10;
 775                 // The global QPixmapCache is used in GuiPainter to cache text
 776                 // painting so we must reset it.
 777                 QPixmapCache::clear();
 778                 guiApp->fontLoader().update();
 779                 lyx::dispatch(FuncRequest(LFUN_SCREEN_FONT_UPDATE));
 780         } else {
 781                 double const lines = qApp->wheelScrollLines()
 782                         * lyxrc.mouse_wheel_speed * delta;
 783                 LYXERR(Debug::SCROLLING, "wheelScrollLines = " << qApp->wheelScrollLines()
 784                         << " delta = " << ev->delta() << " lines = " << lines);
 785                 verticalScrollBar()->setValue(verticalScrollBar()->value() -
 786                         int(lines *  verticalScrollBar()->singleStep()));
 787         }
 788         ev->accept();
 789 }
 790
 791
 792 void GuiWorkArea::generateSyntheticMouseEvent()
 793 {
 794         // Set things off to generate the _next_ 'pseudo' event.
 795         if (synthetic_mouse_event_.restart_timeout)
 796                 synthetic_mouse_event_.timeout.start();
 797
 798         // Has anything changed on-screen since the last timeout signal
 799         // was received?
 800         double const scrollbar_value = verticalScrollBar()->value();
 801         if (scrollbar_value != synthetic_mouse_event_.scrollbar_value_old) {
 802                 // Yes it has. Store the params used to check this.
 803                 synthetic_mouse_event_.scrollbar_value_old = scrollbar_value;
 804
 805                 // ... and dispatch the event to the LyX core.
 806                 dispatch(synthetic_mouse_event_.cmd);
 807         }
 808 }
 809
 810
 811 void GuiWorkArea::keyPressEvent(QKeyEvent * ev)
 812 {
 813         // intercept some keys if completion popup is visible
 814         if (completer_->popupVisible()) {
 815                 switch (ev->key()) {
 816                 case Qt::Key_Enter:
 817                 case Qt::Key_Return:
 818                         completer_->activate();
 819                         ev->accept();
 820                         return;
 821                 }
 822         }
 823
 824         // intercept keys for the completion
 825         if (ev->key() == Qt::Key_Tab) {
 826                 completer_->tab();
 827                 ev->accept();
 828                 return;
 829         }
 830
 831         if (completer_->popupVisible() && ev->key() == Qt::Key_Escape) {
 832                 completer_->hidePopup();
 833                 ev->accept();
 834                 return;
 835         }
 836
 837         if (completer_->inlineVisible() && ev->key() == Qt::Key_Escape) {
 838                 completer_->hideInline();
 839                 ev->accept();
 840                 return;
 841         }
 842
 843         // do nothing if there are other events
 844         // (the auto repeated events come too fast)
 845         // \todo FIXME: remove hard coded Qt keys, process the key binding
 846 #ifdef Q_WS_X11
 847         if (XEventsQueued(QX11Info::display(), 0) > 1 && ev->isAutoRepeat()
 848                         && (Qt::Key_PageDown || Qt::Key_PageUp)) {
 849                 LYXERR(Debug::KEY, "system is busy: scroll key event ignored");
 850                 ev->ignore();
 851                 return;
 852         }
 853 #endif
 854
 855         LYXERR(Debug::KEY, " count: " << ev->count() << " text: " << ev->text()
 856                 << " isAutoRepeat: " << ev->isAutoRepeat() << " key: " << ev->key());
 857
 858         KeySymbol sym;
 859         setKeySymbol(&sym, ev);
 860         processKeySym(sym, q_key_state(ev->modifiers()));
 861         ev->accept();
 862 }
 863
 864
 865 void GuiWorkArea::doubleClickTimeout()
 866 {
 867         dc_event_.active = false;
 868 }
 869
 870
 871 void GuiWorkArea::mouseDoubleClickEvent(QMouseEvent * ev)
 872 {
 873         dc_event_ = DoubleClick(ev);
 874         QTimer::singleShot(QApplication::doubleClickInterval(), this,
 875                            SLOT(doubleClickTimeout()));
 876         FuncRequest cmd(LFUN_MOUSE_DOUBLE,
 877                         ev->x(), ev->y(),
 878                         q_button_state(ev->button()));
 879         dispatch(cmd);
 880         ev->accept();
 881 }
 882
 883
 884 void GuiWorkArea::resizeEvent(QResizeEvent * ev)
 885 {
 886         QAbstractScrollArea::resizeEvent(ev);
 887         need_resize_ = true;
 888         ev->accept();
 889 }
 890
 891
 892 void GuiWorkArea::update(int x, int y, int w, int h)
 893 {
 894         viewport()->repaint(x, y, w, h);
 895 }
 896
 897
 898 void GuiWorkArea::paintEvent(QPaintEvent * ev)
 899 {
 900         QRect const rc = ev->rect();
 901         // LYXERR(Debug::PAINTING, "paintEvent begin: x: " << rc.x()
 902         //      << " y: " << rc.y() << " w: " << rc.width() << " h: " << rc.height());
 903
 904         if (need_resize_) {
 905                 screen_ = QPixmap(viewport()->width(), viewport()->height());
 906                 resizeBufferView();
 907                 hideCursor();
 908                 showCursor();
 909         }
 910
 911         QPainter pain(viewport());
 912         pain.drawPixmap(rc, screen_, rc);
 913         cursor_->draw(pain);
 914         ev->accept();
 915 }
 916
 917
 918 void GuiWorkArea::updateScreen()
 919 {
 920         GuiPainter pain(&screen_);
 921         buffer_view_->draw(pain);
 922 }
 923
 924
 925 void GuiWorkArea::showCursor(int x, int y, int h,
 926         bool l_shape, bool rtl, bool completable)
 927 {
 928         if (schedule_redraw_) {
 929                 buffer_view_->updateMetrics();
 930                 updateScreen();
 931                 viewport()->update(QRect(0, 0, viewport()->width(), viewport()->height()));
 932                 schedule_redraw_ = false;
 933                 // Show the cursor immediately after the update.
 934                 hideCursor();
 935                 toggleCursor();
 936                 return;
 937         }
 938
 939         cursor_->update(x, y, h, l_shape, rtl, completable);
 940         cursor_->show();
 941         viewport()->update(cursor_->rect());
 942 }
 943
 944
 945 void GuiWorkArea::removeCursor()
 946 {
 947         cursor_->hide();
 948         //if (!qApp->focusWidget())
 949                 viewport()->update(cursor_->rect());
 950 }
 951
 952
 953 void GuiWorkArea::inputMethodEvent(QInputMethodEvent * e)
 954 {
 955         QString const & commit_string = e->commitString();
 956         docstring const & preedit_string
 957                 = qstring_to_ucs4(e->preeditString());
 958
 959         if (!commit_string.isEmpty()) {
 960
 961                 LYXERR(Debug::KEY, "preeditString: " << e->preeditString()
 962                         << " commitString: " << e->commitString());
 963
 964                 int key = 0;
 965
 966                 // FIXME Iwami 04/01/07: we should take care also of UTF16 surrogates here.
 967                 for (int i = 0; i != commit_string.size(); ++i) {
 968                         QKeyEvent ev(QEvent::KeyPress, key, Qt::NoModifier, commit_string[i]);
 969                         keyPressEvent(&ev);
 970                 }
 971         }
 972
 973         // Hide the cursor during the kana-kanji transformation.
 974         if (preedit_string.empty())
 975                 startBlinkingCursor();
 976         else
 977                 stopBlinkingCursor();
 978
 979         // last_width : for checking if last preedit string was/wasn't empty.
 980         static bool last_width = false;
 981         if (!last_width && preedit_string.empty()) {
 982                 // if last_width is last length of preedit string.
 983                 e->accept();
 984                 return;
 985         }
 986
 987         GuiPainter pain(&screen_);
 988         buffer_view_->updateMetrics();
 989         buffer_view_->draw(pain);
 990         FontInfo font = buffer_view_->cursor().getFont().fontInfo();
 991         FontMetrics const & fm = theFontMetrics(font);
 992         int height = fm.maxHeight();
 993         int cur_x = cursor_->rect().left();
 994         int cur_y = cursor_->rect().bottom();
 995
 996         // redraw area of preedit string.
 997         update(0, cur_y - height, viewport()->width(),
 998                 (height + 1) * preedit_lines_);
 999
1000         if (preedit_string.empty()) {
1001                 last_width = false;
1002                 preedit_lines_ = 1;
1003                 e->accept();
1004                 return;
1005         }
1006         last_width = true;
1007
1008         // att : stores an IM attribute.
1009         QList<QInputMethodEvent::Attribute> const & att = e->attributes();
1010
1011         // get attributes of input method cursor.
1012         // cursor_pos : cursor position in preedit string.
1013         size_t cursor_pos = 0;
1014         bool cursor_is_visible = false;
1015         for (int i = 0; i != att.size(); ++i) {
1016                 if (att.at(i).type == QInputMethodEvent::Cursor) {
1017                         cursor_pos = att.at(i).start;
1018                         cursor_is_visible = att.at(i).length != 0;
1019                         break;
1020                 }
1021         }
1022
1023         size_t preedit_length = preedit_string.length();
1024
1025         // get position of selection in input method.
1026         // FIXME: isn't there a way to do this simplier?
1027         // rStart : cursor position in selected string in IM.
1028         size_t rStart = 0;
1029         // rLength : selected string length in IM.
1030         size_t rLength = 0;
1031         if (cursor_pos < preedit_length) {
1032                 for (int i = 0; i != att.size(); ++i) {
1033                         if (att.at(i).type == QInputMethodEvent::TextFormat) {
1034                                 if (att.at(i).start <= int(cursor_pos)
1035                                         && int(cursor_pos) < att.at(i).start + att.at(i).length) {
1036                                                 rStart = att.at(i).start;
1037                                                 rLength = att.at(i).length;
1038                                                 if (!cursor_is_visible)
1039                                                         cursor_pos += rLength;
1040                                                 break;
1041                                 }
1042                         }
1043                 }
1044         }
1045         else {
1046                 rStart = cursor_pos;
1047                 rLength = 0;
1048         }
1049
1050         int const right_margin = buffer_view_->rightMargin();
1051         Painter::preedit_style ps;
1052         // Most often there would be only one line:
1053         preedit_lines_ = 1;
1054         for (size_t pos = 0; pos != preedit_length; ++pos) {
1055                 char_type const typed_char = preedit_string[pos];
1056                 // reset preedit string style
1057                 ps = Painter::preedit_default;
1058
1059                 // if we reached the right extremity of the screen, go to next line.
1060                 if (cur_x + fm.width(typed_char) > viewport()->width() - right_margin) {
1061                         cur_x = right_margin;
1062                         cur_y += height + 1;
1063                         ++preedit_lines_;
1064                 }
1065                 // preedit strings are displayed with dashed underline
1066                 // and partial strings are displayed white on black indicating
1067                 // that we are in selecting mode in the input method.
1068                 // FIXME: rLength == preedit_length is not a changing condition
1069                 // FIXME: should be put out of the loop.
1070                 if (pos >= rStart
1071                         && pos < rStart + rLength
1072                         && !(cursor_pos < rLength && rLength == preedit_length))
1073                         ps = Painter::preedit_selecting;
1074
1075                 if (pos == cursor_pos
1076                         && (cursor_pos < rLength && rLength == preedit_length))
1077                         ps = Painter::preedit_cursor;
1078
1079                 // draw one character and update cur_x.
1080                 cur_x += pain.preeditText(cur_x, cur_y, typed_char, font, ps);
1081         }
1082
1083         // update the preedit string screen area.
1084         update(0, cur_y - preedit_lines_*height, viewport()->width(),
1085                 (height + 1) * preedit_lines_);
1086
1087         // Don't forget to accept the event!
1088         e->accept();
1089 }
1090
1091
1092 QVariant GuiWorkArea::inputMethodQuery(Qt::InputMethodQuery query) const
1093 {
1094         QRect cur_r(0,0,0,0);
1095         switch (query) {
1096                 // this is the CJK-specific composition window position.
1097                 case Qt::ImMicroFocus:
1098                         cur_r = cursor_->rect();
1099                         if (preedit_lines_ != 1)
1100                                 cur_r.moveLeft(10);
1101                         cur_r.moveBottom(cur_r.bottom() + cur_r.height() * preedit_lines_);
1102                         // return lower right of cursor in LyX.
1103                         return cur_r;
1104                 default:
1105                         return QWidget::inputMethodQuery(query);
1106         }
1107 }
1108
1109
1110 void GuiWorkArea::updateWindowTitle()
1111 {
1112         docstring maximize_title;
1113         docstring minimize_title;
1114
1115         Buffer & buf = buffer_view_->buffer();
1116         FileName const fileName = buf.fileName();
1117         if (!fileName.empty()) {
1118                 maximize_title = fileName.displayName(30);
1119                 minimize_title = from_utf8(fileName.onlyFileName());
1120                 if (!buf.isClean()) {
1121                         maximize_title += _(" (changed)");
1122                         minimize_title += char_type('*');
1123                 }
1124                 if (buf.isReadonly())
1125                         maximize_title += _(" (read only)");
1126         }
1127
1128         QString title = windowTitle();
1129         QString new_title = toqstr(maximize_title);
1130         if (title == new_title)
1131                 return;
1132
1133         QWidget::setWindowTitle(new_title);
1134         QWidget::setWindowIconText(toqstr(minimize_title));
1135         titleChanged(this);
1136 }
1137
1138
1139 void GuiWorkArea::setReadOnly(bool)
1140 {
1141         updateWindowTitle();
1142         if (this == lyx_view_->currentWorkArea())
1143                 lyx_view_->updateDialogs();
1144 }
1145
1146
1147 bool GuiWorkArea::isFullScreen()
1148 {
1149         return lyx_view_ && lyx_view_->isFullScreen();
1150 }
1151
1152
1153 ////////////////////////////////////////////////////////////////////
1154 //
1155 // TabWorkArea
1156 //
1157 ////////////////////////////////////////////////////////////////////
1158
1159 #ifdef Q_WS_MACX
1160 class NoTabFrameMacStyle : public QMacStyle {
1161 public:
1162         ///
1163         QRect subElementRect(SubElement element, const QStyleOption * option,
1164                              const QWidget * widget = 0) const
1165         {
1166                 QRect rect = QMacStyle::subElementRect(element, option, widget);
1167                 bool noBar = static_cast<QTabWidget const *>(widget)->count() <= 1;
1168
1169                 // The Qt Mac style puts the contents into a 3 pixel wide box
1170                 // which looks very ugly and not like other Mac applications.
1171                 // Hence we remove this here, and moreover the 16 pixel round
1172                 // frame above if the tab bar is hidden.
1173                 if (element == QStyle::SE_TabWidgetTabContents) {
1174                         rect.adjust(- rect.left(), 0, rect.left(), 0);
1175                         if (noBar)
1176                                 rect.setTop(0);
1177                 }
1178
1179                 return rect;
1180         }
1181 };
1182
1183 NoTabFrameMacStyle noTabFrameMacStyle;
1184 #endif
1185
1186
1187 TabWorkArea::TabWorkArea(QWidget * parent)
1188         : QTabWidget(parent), clicked_tab_(-1)
1189 {
1190 #ifdef Q_WS_MACX
1191         setStyle(&noTabFrameMacStyle);
1192 #endif
1193
1194         QPalette pal = palette();
1195         pal.setColor(QPalette::Active, QPalette::Button,
1196                 pal.color(QPalette::Active, QPalette::Window));
1197         pal.setColor(QPalette::Disabled, QPalette::Button,
1198                 pal.color(QPalette::Disabled, QPalette::Window));
1199         pal.setColor(QPalette::Inactive, QPalette::Button,
1200                 pal.color(QPalette::Inactive, QPalette::Window));
1201
1202         QObject::connect(this, SIGNAL(currentChanged(int)),
1203                 this, SLOT(on_currentTabChanged(int)));
1204
1205         QToolButton * closeBufferButton = new QToolButton(this);
1206         closeBufferButton->setPalette(pal);
1207         // FIXME: rename the icon to closebuffer.png
1208         closeBufferButton->setIcon(QIcon(":/images/closetab.png"));
1209         closeBufferButton->setText("Close File");
1210         closeBufferButton->setAutoRaise(true);
1211         closeBufferButton->setCursor(Qt::ArrowCursor);
1212         closeBufferButton->setToolTip(qt_("Close File"));
1213         closeBufferButton->setEnabled(true);
1214         QObject::connect(closeBufferButton, SIGNAL(clicked()),
1215                 this, SLOT(closeCurrentBuffer()));
1216         setCornerWidget(closeBufferButton, Qt::TopRightCorner);
1217
1218         // setup drag'n'drop
1219         QTabBar* tb = new DragTabBar;
1220         connect(tb, SIGNAL(tabMoveRequested(int, int)),
1221                 this, SLOT(moveTab(int, int)));
1222         tb->setElideMode(Qt::ElideNone);
1223         setTabBar(tb);
1224
1225         // make us responsible for the context menu of the tabbar
1226         tb->setContextMenuPolicy(Qt::CustomContextMenu);
1227         connect(tb, SIGNAL(customContextMenuRequested(const QPoint &)),
1228                 this, SLOT(showContextMenu(const QPoint &)));
1229
1230         setUsesScrollButtons(true);
1231 }
1232
1233
1234 void TabWorkArea::setFullScreen(bool full_screen)
1235 {
1236         for (int i = 0; i != count(); ++i) {
1237                 if (GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i)))
1238                         wa->setFullScreen(full_screen);
1239         }
1240
1241         if (lyxrc.full_screen_tabbar)
1242                 showBar(!full_screen && count()>1);
1243 }
1244
1245
1246 void TabWorkArea::showBar(bool show)
1247 {
1248         tabBar()->setEnabled(show);
1249         tabBar()->setVisible(show);
1250 }
1251
1252
1253 GuiWorkArea * TabWorkArea::currentWorkArea()
1254 {
1255         if (count() == 0)
1256                 return 0;
1257
1258         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(currentWidget());
1259         LASSERT(wa, /**/);
1260         return wa;
1261 }
1262
1263
1264 GuiWorkArea * TabWorkArea::workArea(Buffer & buffer)
1265 {
1266         for (int i = 0; i != count(); ++i) {
1267                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i));
1268                 LASSERT(wa, return 0);
1269                 if (&wa->bufferView().buffer() == &buffer)
1270                         return wa;
1271         }
1272         return 0;
1273 }
1274
1275
1276 void TabWorkArea::closeAll()
1277 {
1278         while (count()) {
1279                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(0));
1280                 LASSERT(wa, /**/);
1281                 removeTab(0);
1282                 delete wa;
1283         }
1284 }
1285
1286
1287 bool TabWorkArea::setCurrentWorkArea(GuiWorkArea * work_area)
1288 {
1289         LASSERT(work_area, /**/);
1290         int index = indexOf(work_area);
1291         if (index == -1)
1292                 return false;
1293
1294         if (index == currentIndex())
1295                 // Make sure the work area is up to date.
1296                 on_currentTabChanged(index);
1297         else
1298                 // Switch to the work area.
1299                 setCurrentIndex(index);
1300         work_area->setFocus();
1301
1302         return true;
1303 }
1304
1305
1306 GuiWorkArea * TabWorkArea::addWorkArea(Buffer & buffer, GuiView & view)
1307 {
1308         GuiWorkArea * wa = new GuiWorkArea(buffer, view);
1309         wa->setUpdatesEnabled(false);
1310         // Hide tabbar if there's no tab (avoid a resize and a flashing tabbar
1311         // when hiding it again below).
1312         if (!(currentWorkArea() && currentWorkArea()->isFullScreen()))
1313                 showBar(count() > 0);
1314         addTab(wa, wa->windowTitle());
1315         QObject::connect(wa, SIGNAL(titleChanged(GuiWorkArea *)),
1316                 this, SLOT(updateTabTexts()));
1317         if (currentWorkArea() && currentWorkArea()->isFullScreen())
1318                 setFullScreen(true);
1319         else
1320                 // Hide tabbar if there's only one tab.
1321                 showBar(count() > 1);
1322
1323         updateTabTexts();
1324
1325         return wa;
1326 }
1327
1328
1329 bool TabWorkArea::removeWorkArea(GuiWorkArea * work_area)
1330 {
1331         LASSERT(work_area, return false);
1332         int index = indexOf(work_area);
1333         if (index == -1)
1334                 return false;
1335
1336         work_area->setUpdatesEnabled(false);
1337         removeTab(index);
1338         delete work_area;
1339
1340         if (count()) {
1341                 // make sure the next work area is enabled.
1342                 currentWidget()->setUpdatesEnabled(true);
1343                 if (currentWorkArea() && currentWorkArea()->isFullScreen())
1344                         setFullScreen(true);
1345                 else
1346                         // Hide tabbar if there's only one tab.
1347                         showBar(count() > 1);
1348         } else {
1349                 lastWorkAreaRemoved();
1350         }
1351
1352         updateTabTexts();
1353
1354         return true;
1355 }
1356
1357
1358 void TabWorkArea::on_currentTabChanged(int i)
1359 {
1360         // returns e.g. on application destruction
1361         if (i == -1)
1362                 return;
1363         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i));
1364         LASSERT(wa, return);
1365         BufferView & bv = wa->bufferView();
1366         bv.cursor().fixIfBroken();
1367         bv.updateMetrics();
1368         wa->setUpdatesEnabled(true);
1369         wa->redraw();
1370         wa->setFocus();
1371         ///
1372         currentWorkAreaChanged(wa);
1373
1374         LYXERR(Debug::GUI, "currentTabChanged " << i
1375                 << "File" << bv.buffer().absFileName());
1376 }
1377
1378
1379 void TabWorkArea::closeCurrentBuffer()
1380 {
1381         if (clicked_tab_ != -1)
1382                 setCurrentIndex(clicked_tab_);
1383
1384         lyx::dispatch(FuncRequest(LFUN_BUFFER_CLOSE));
1385 }
1386
1387
1388 void TabWorkArea::closeCurrentTab()
1389 {
1390         if (clicked_tab_ == -1)
1391                 removeWorkArea(currentWorkArea());
1392         else {
1393                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(clicked_tab_));
1394                 LASSERT(wa, /**/);
1395                 removeWorkArea(wa);
1396         }
1397 }
1398
1399 ///
1400 class DisplayPath {
1401 public:
1402         /// make vector happy
1403         DisplayPath() {}
1404         ///
1405         DisplayPath(int tab, FileName const & filename)
1406                 : tab_(tab)
1407         {
1408                 filename_ = toqstr(filename.onlyFileNameWithoutExt());
1409                 postfix_ = toqstr(filename.absoluteFilePath()).
1410                         split("/", QString::SkipEmptyParts);
1411                 postfix_.pop_back();
1412                 abs_ = toqstr(filename.absoluteFilePath());
1413                 dottedPrefix_ = false;
1414         }
1415
1416         /// Absolute path for debugging.
1417         QString abs() const
1418         {
1419                 return abs_;
1420         }
1421         /// Add the first segment from the postfix or three dots to the prefix.
1422         /// Merge multiple dot tripples. In fact dots are added lazily, i.e. only
1423         /// when really needed.
1424         void shiftPathSegment(bool dotted)
1425         {
1426                 if (postfix_.count() <= 0)
1427                         return;
1428
1429                 if (!dotted) {
1430                         if (dottedPrefix_ && !prefix_.isEmpty())
1431                                 prefix_ += ".../";
1432                         prefix_ += postfix_.front() + "/";
1433                 }
1434                 dottedPrefix_ = dotted && !prefix_.isEmpty();
1435                 postfix_.pop_front();
1436         }
1437         ///
1438         QString displayString() const
1439         {
1440                 if (prefix_.isEmpty())
1441                         return filename_;
1442
1443                 bool dots = dottedPrefix_ || !postfix_.isEmpty();
1444                 return prefix_ + (dots ? ".../" : "") + filename_;
1445         }
1446         ///
1447         QString forecastPathString() const
1448         {
1449                 if (postfix_.count() == 0)
1450                         return displayString();
1451
1452                 return prefix_
1453                         + (dottedPrefix_ ? ".../" : "")
1454                         + postfix_.front() + "/";
1455         }
1456         ///
1457         bool final() const { return postfix_.empty(); }
1458         ///
1459         int tab() const { return tab_; }
1460
1461 private:
1462         ///
1463         QString prefix_;
1464         ///
1465         QStringList postfix_;
1466         ///
1467         QString filename_;
1468         ///
1469         QString abs_;
1470         ///
1471         int tab_;
1472         ///
1473         bool dottedPrefix_;
1474 };
1475
1476
1477 ///
1478 bool operator<(DisplayPath const & a, DisplayPath const & b)
1479 {
1480         return a.displayString() < b.displayString();
1481 }
1482
1483 ///
1484 bool operator==(DisplayPath const & a, DisplayPath const & b)
1485 {
1486         return a.displayString() == b.displayString();
1487 }
1488
1489
1490 void TabWorkArea::updateTabTexts()
1491 {
1492         size_t n = count();
1493         if (n == 0)
1494                 return;
1495         std::list<DisplayPath> paths;
1496         typedef std::list<DisplayPath>::iterator It;
1497
1498         // collect full names first: path into postfix, empty prefix and
1499         // filename without extension
1500         for (size_t i = 0; i < n; ++i) {
1501                 GuiWorkArea * i_wa = dynamic_cast<GuiWorkArea *>(widget(i));
1502                 FileName const fn = i_wa->bufferView().buffer().fileName();
1503                 paths.push_back(DisplayPath(i, fn));
1504         }
1505
1506         // go through path segments and see if it helps to make the path more unique
1507         bool somethingChanged = true;
1508         bool allFinal = false;
1509         while (somethingChanged && !allFinal) {
1510                 // adding path segments changes order
1511                 paths.sort();
1512
1513                 LYXERR(Debug::GUI, "updateTabTexts() iteration start");
1514                 somethingChanged = false;
1515                 allFinal = true;
1516
1517                 // find segments which are not unique (i.e. non-atomic)
1518                 It it = paths.begin();
1519                 It segStart = it;
1520                 QString segString = it->displayString();
1521                 for (; it != paths.end(); ++it) {
1522                         // look to the next item
1523                         It next = it;
1524                         ++next;
1525
1526                         // final?
1527                         allFinal = allFinal && it->final();
1528
1529                         LYXERR(Debug::GUI, "it = " << fromqstr(it->abs())
1530                                << " => " << fromqstr(it->displayString()));
1531
1532                         // still the same segment?
1533                         QString nextString;
1534                         if ((next != paths.end()
1535                              && (nextString = next->displayString()) == segString))
1536                                 continue;
1537                         LYXERR(Debug::GUI, "segment ended");
1538
1539                         // only a trivial one with one element?
1540                         if (it == segStart) {
1541                                 // start new segment
1542                                 segStart = next;
1543                                 segString = nextString;
1544                                 continue;
1545                         }
1546
1547                         // we found a non-atomic segment segStart <= sit <= it < next.
1548                         // Shift path segments and hope for the best
1549                         // that it makes the path more unique.
1550                         somethingChanged = true;
1551                         It sit = segStart;
1552                         QString dspString = sit->forecastPathString();
1553                         LYXERR(Debug::GUI, "first forecast found for "
1554                                << fromqstr(sit->abs())
1555                                << " => " << fromqstr(dspString));
1556                         ++sit;
1557                         bool moreUnique = false;
1558                         for (; sit != next; ++sit) {
1559                                 if (sit->forecastPathString() != dspString) {
1560                                         LYXERR(Debug::GUI, "different forecast found for "
1561                                                << fromqstr(sit->abs())
1562                                                << " => "
1563                                                << fromqstr(sit->forecastPathString()));
1564                                         moreUnique = true;
1565                                         break;
1566                                 }
1567                                 LYXERR(Debug::GUI, "same forecast found for "
1568                                         << fromqstr(sit->abs())
1569                                         << " => "
1570                                         << fromqstr(dspString));
1571                         }
1572
1573                         // if the path segment helped, add it. Otherwise add dots
1574                         bool dots = !moreUnique;
1575                         LYXERR(Debug::GUI, "using dots = " << dots);
1576                         for (sit = segStart; sit != next; ++sit) {
1577                                 sit->shiftPathSegment(dots);
1578                                 LYXERR(Debug::GUI, "shifting " << fromqstr(sit->abs())
1579                                        << " => "
1580                                        << fromqstr(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"