src/frontends/qt4/GuiWorkArea.cpp

   1 /**
   2  * \file GuiWorkArea.cpp
   3  * This file is part of LyX, the document processor.
   4  * Licence details can be found in the file COPYING.
   5  *
   6  * \author John Levon
   7  * \author Abdelrazak Younes
   8  *
   9  * Full author contact details are available in file CREDITS.
  10  */
  11
  12 #include <config.h>
  13
  14 #include "GuiWorkArea.h"
  15
  16 #include "ColorCache.h"
  17 #include "FontLoader.h"
  18 #include "Menus.h"
  19
  20 #include "Buffer.h"
  21 #include "BufferList.h"
  22 #include "BufferParams.h"
  23 #include "BufferView.h"
  24 #include "CoordCache.h"
  25 #include "Cursor.h"
  26 #include "Font.h"
  27 #include "FuncRequest.h"
  28 #include "GuiApplication.h"
  29 #include "GuiCompleter.h"
  30 #include "GuiKeySymbol.h"
  31 #include "GuiPainter.h"
  32 #include "GuiView.h"
  33 #include "KeySymbol.h"
  34 #include "Language.h"
  35 #include "LyXFunc.h"
  36 #include "LyXRC.h"
  37 #include "LyXVC.h"
  38 #include "MetricsInfo.h"
  39 #include "qt_helpers.h"
  40 #include "Text.h"
  41 #include "version.h"
  42
  43 #include "graphics/GraphicsImage.h"
  44 #include "graphics/GraphicsLoader.h"
  45
  46 #include "support/convert.h"
  47 #include "support/debug.h"
  48 #include "support/gettext.h"
  49 #include "support/FileName.h"
  50
  51 #include "frontends/Application.h"
  52 #include "frontends/FontMetrics.h"
  53 #include "frontends/WorkAreaManager.h"
  54
  55 #include <QContextMenuEvent>
  56 #include <QInputContext>
  57 #include <QHelpEvent>
  58 #ifdef Q_WS_MACX
  59 #include <QMacStyle>
  60 #endif
  61 #include <QMainWindow>
  62 #include <QMenu>
  63 #include <QPainter>
  64 #include <QPalette>
  65 #include <QPixmapCache>
  66 #include <QScrollBar>
  67 #include <QTimer>
  68 #include <QToolButton>
  69 #include <QToolTip>
  70 #include <QMenuBar>
  71
  72 #include <boost/bind.hpp>
  73
  74 #include <cmath>
  75
  76 #ifdef Q_WS_X11
  77 #include <QX11Info>
  78 extern "C" int XEventsQueued(Display *display, int mode);
  79 #endif
  80
  81 #ifdef Q_WS_WIN
  82 int const CursorWidth = 2;
  83 #else
  84 int const CursorWidth = 1;
  85 #endif
  86 int const TabIndicatorWidth = 3;
  87
  88 #undef KeyPress
  89 #undef NoModifier
  90
  91 using namespace std;
  92 using namespace lyx::support;
  93
  94 namespace lyx {
  95
  96
  97 /// return the LyX mouse button state from Qt's
  98 static mouse_button::state q_button_state(Qt::MouseButton button)
  99 {
 100         mouse_button::state b = mouse_button::none;
 101         switch (button) {
 102                 case Qt::LeftButton:
 103                         b = mouse_button::button1;
 104                         break;
 105                 case Qt::MidButton:
 106                         b = mouse_button::button2;
 107                         break;
 108                 case Qt::RightButton:
 109                         b = mouse_button::button3;
 110                         break;
 111                 default:
 112                         break;
 113         }
 114         return b;
 115 }
 116
 117
 118 /// return the LyX mouse button state from Qt's
 119 mouse_button::state q_motion_state(Qt::MouseButtons state)
 120 {
 121         mouse_button::state b = mouse_button::none;
 122         if (state & Qt::LeftButton)
 123                 b |= mouse_button::button1;
 124         if (state & Qt::MidButton)
 125                 b |= mouse_button::button2;
 126         if (state & Qt::RightButton)
 127                 b |= mouse_button::button3;
 128         return b;
 129 }
 130
 131
 132 namespace frontend {
 133
 134 class CursorWidget {
 135 public:
 136         CursorWidget() {}
 137
 138         void draw(QPainter & painter)
 139         {
 140                 if (!show_ || !rect_.isValid())
 141                         return;
 142
 143                 int y = rect_.top();
 144                 int l = x_ - rect_.left();
 145                 int r = rect_.right() - x_;
 146                 int bot = rect_.bottom();
 147
 148                 // draw vertica linel
 149                 painter.fillRect(x_, y, CursorWidth, rect_.height(), color_);
 150
 151                 // draw RTL/LTR indication
 152                 painter.setPen(color_);
 153                 if (l_shape_) {
 154                         if (rtl_)
 155                                 painter.drawLine(x_, bot, x_ - l, bot);
 156                         else
 157                                 painter.drawLine(x_, bot, x_ + CursorWidth + r, bot);
 158                 }
 159
 160                 // draw completion triangle
 161                 if (completable_) {
 162                         int m = y + rect_.height() / 2;
 163                         int d = TabIndicatorWidth - 1;
 164                         if (rtl_) {
 165                                 painter.drawLine(x_ - 1, m - d, x_ - 1 - d, m);
 166                                 painter.drawLine(x_ - 1, m + d, x_ - 1 - d, m);
 167                         } else {
 168                                 painter.drawLine(x_ + CursorWidth, m - d, x_ + CursorWidth + d, m);
 169                                 painter.drawLine(x_ + CursorWidth, m + d, x_ + CursorWidth + d, m);
 170                         }
 171                 }
 172         }
 173
 174         void update(int x, int y, int h, bool l_shape,
 175                 bool rtl, bool completable)
 176         {
 177                 color_ = guiApp->colorCache().get(Color_cursor);
 178                 l_shape_ = l_shape;
 179                 rtl_ = rtl;
 180                 completable_ = completable;
 181                 x_ = x;
 182
 183                 // extension to left and right
 184                 int l = 0;
 185                 int r = 0;
 186
 187                 // RTL/LTR indication
 188                 if (l_shape_) {
 189                         if (rtl)
 190                                 l += h / 3;
 191                         else
 192                                 r += h / 3;
 193                 }
 194
 195                 // completion triangle
 196                 if (completable_) {
 197                         if (rtl)
 198                                 l = max(l, TabIndicatorWidth);
 199                         else
 200                                 r = max(r, TabIndicatorWidth);
 201                 }
 202
 203                 // compute overall rectangle
 204                 rect_ = QRect(x - l, y, CursorWidth + r + l, h);
 205         }
 206
 207         void show(bool set_show = true) { show_ = set_show; }
 208         void hide() { show_ = false; }
 209
 210         QRect const & rect() { return rect_; }
 211
 212 private:
 213         /// cursor is in RTL or LTR text
 214         bool rtl_;
 215         /// indication for RTL or LTR
 216         bool l_shape_;
 217         /// triangle to show that a completion is available
 218         bool completable_;
 219         ///
 220         bool show_;
 221         ///
 222         QColor color_;
 223         /// rectangle, possibly with l_shape and completion triangle
 224         QRect rect_;
 225         /// x position (were the vertical line is drawn)
 226         int x_;
 227 };
 228
 229
 230 // This is a 'heartbeat' generating synthetic mouse move events when the
 231 // cursor is at the top or bottom edge of the viewport. One scroll per 0.2 s
 232 SyntheticMouseEvent::SyntheticMouseEvent()
 233         : timeout(200), restart_timeout(true),
 234           x_old(-1), y_old(-1), min_scrollbar_old(-1), max_scrollbar_old(-1)
 235 {}
 236
 237
 238 GuiWorkArea::GuiWorkArea(QWidget *)
 239         : buffer_view_(0), lyx_view_(0),
 240         cursor_visible_(false),
 241         need_resize_(false), schedule_redraw_(false),
 242         preedit_lines_(1), completer_(new GuiCompleter(this)),
 243         context_target_pos_()
 244 {
 245 }
 246
 247
 248 GuiWorkArea::GuiWorkArea(Buffer & buffer, GuiView & gv)
 249         : buffer_view_(0), lyx_view_(0),
 250         cursor_visible_(false),
 251         need_resize_(false), schedule_redraw_(false),
 252         preedit_lines_(1), completer_(new GuiCompleter(this)),
 253         context_target_pos_()
 254 {
 255         setGuiView(gv);
 256         setBuffer(buffer);
 257         init();
 258 }
 259
 260
 261 void GuiWorkArea::init()
 262 {
 263         // Setup the signals
 264         connect(&cursor_timeout_, SIGNAL(timeout()),
 265                 this, SLOT(toggleCursor()));
 266
 267         int const time = QApplication::cursorFlashTime() / 2;
 268         if (time > 0) {
 269                 cursor_timeout_.setInterval(time);
 270                 cursor_timeout_.start();
 271         } else {
 272                 // let's initialize this just to be safe
 273                 cursor_timeout_.setInterval(500);
 274         }
 275
 276         screen_ = QPixmap(viewport()->width(), viewport()->height());
 277         // With Qt4.5 a mouse event will happen before the first paint event
 278         // so make sure that the buffer view has an up to date metrics.
 279         buffer_view_->resize(viewport()->width(), viewport()->height());
 280         cursor_ = new frontend::CursorWidget();
 281         cursor_->hide();
 282
 283         setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 284         setAcceptDrops(true);
 285         setMouseTracking(true);
 286         setMinimumSize(100, 70);
 287         setFrameStyle(QFrame::NoFrame);
 288         updateWindowTitle();
 289
 290         viewport()->setAutoFillBackground(false);
 291         // We don't need double-buffering nor SystemBackground on
 292         // the viewport because we have our own backing pixmap.
 293         viewport()->setAttribute(Qt::WA_NoSystemBackground);
 294
 295         setFocusPolicy(Qt::StrongFocus);
 296
 297         viewport()->setCursor(Qt::IBeamCursor);
 298
 299         synthetic_mouse_event_.timeout.timeout.connect(
 300                 boost::bind(&GuiWorkArea::generateSyntheticMouseEvent,
 301                                         this));
 302
 303         // Initialize the vertical Scroll Bar
 304         QObject::connect(verticalScrollBar(), SIGNAL(valueChanged(int)),
 305                 this, SLOT(scrollTo(int)));
 306
 307         LYXERR(Debug::GUI, "viewport width: " << viewport()->width()
 308                 << "  viewport height: " << viewport()->height());
 309
 310         // Enables input methods for asian languages.
 311         // Must be set when creating custom text editing widgets.
 312         setAttribute(Qt::WA_InputMethodEnabled, true);
 313
 314         dialog_mode_ = false;
 315 }
 316
 317
 318 GuiWorkArea::~GuiWorkArea()
 319 {
 320         buffer_view_->buffer().workAreaManager().remove(this);
 321         delete buffer_view_;
 322         delete cursor_;
 323         // Completer has a QObject parent and is thus automatically destroyed.
 324         // delete completer_;
 325 }
 326
 327
 328 void GuiWorkArea::setGuiView(GuiView & gv)
 329 {
 330         lyx_view_ = &gv;
 331 }
 332
 333
 334 void GuiWorkArea::setBuffer(Buffer & buffer)
 335 {
 336         delete buffer_view_;
 337         buffer_view_ = new BufferView(buffer),
 338         buffer.workAreaManager().add(this);
 339
 340         // HACK: Prevents an additional redraw when the scrollbar pops up
 341         // which regularily happens on documents with more than one page.
 342         // The policy  should be set to "Qt::ScrollBarAsNeeded" soon.
 343         // Since we have no geometry information yet, we assume that
 344         // a document needs a scrollbar if there is more then four
 345         // paragraph in the outermost text.
 346         if (buffer.text().paragraphs().size() > 4)
 347                 setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
 348         QTimer::singleShot(50, this, SLOT(fixVerticalScrollBar()));
 349 }
 350
 351
 352 void GuiWorkArea::fixVerticalScrollBar()
 353 {
 354         if (!isFullScreen())
 355                 setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
 356 }
 357
 358
 359 void GuiWorkArea::close()
 360 {
 361         lyx_view_->removeWorkArea(this);
 362 }
 363
 364
 365 void GuiWorkArea::setFullScreen(bool full_screen)
 366 {
 367         buffer_view_->setFullScreen(full_screen);
 368         setFrameStyle(QFrame::NoFrame);
 369         if (full_screen) {
 370                 setFrameStyle(QFrame::NoFrame);
 371                 if (lyxrc.full_screen_scrollbar)
 372                         setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 373         } else
 374                 setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
 375 }
 376
 377
 378 BufferView & GuiWorkArea::bufferView()
 379 {
 380         return *buffer_view_;
 381 }
 382
 383
 384 BufferView const & GuiWorkArea::bufferView() const
 385 {
 386         return *buffer_view_;
 387 }
 388
 389
 390 void GuiWorkArea::stopBlinkingCursor()
 391 {
 392         cursor_timeout_.stop();
 393         hideCursor();
 394 }
 395
 396
 397 void GuiWorkArea::startBlinkingCursor()
 398 {
 399         showCursor();
 400         //we're not supposed to cache this value.
 401         int const time = QApplication::cursorFlashTime() / 2;
 402         if (time <= 0)
 403                 return;
 404         cursor_timeout_.setInterval(time);
 405         cursor_timeout_.start();
 406 }
 407
 408
 409 void GuiWorkArea::redraw()
 410 {
 411         if (!isVisible())
 412                 // No need to redraw in this case.
 413                 return;
 414
 415         // No need to do anything if this is the current view. The BufferView
 416         // metrics are already up to date.
 417         if (lyx_view_ != guiApp->currentView()
 418                 || lyx_view_->currentWorkArea() != this) {
 419                 // FIXME: it would be nice to optimize for the off-screen case.
 420                 buffer_view_->updateMetrics();
 421                 buffer_view_->cursor().fixIfBroken();
 422         }
 423
 424         // update cursor position, because otherwise it has to wait until
 425         // the blinking interval is over
 426         if (cursor_visible_) {
 427                 hideCursor();
 428                 showCursor();
 429         }
 430
 431         LYXERR(Debug::WORKAREA, "WorkArea::redraw screen");
 432         updateScreen();
 433         update(0, 0, viewport()->width(), viewport()->height());
 434
 435         /// \warning: scrollbar updating *must* be done after the BufferView is drawn
 436         /// because \c BufferView::updateScrollbar() is called in \c BufferView::draw().
 437         updateScrollbar();
 438         lyx_view_->updateStatusBar();
 439
 440         if (lyxerr.debugging(Debug::WORKAREA))
 441                 buffer_view_->coordCache().dump();
 442 }
 443
 444
 445 void GuiWorkArea::processKeySym(KeySymbol const & key, KeyModifier mod)
 446 {
 447         if (lyx_view_->isFullScreen() && lyx_view_->menuBar()->isVisible()
 448                 && lyxrc.full_screen_menubar) {
 449                 // FIXME HACK: we should not have to do this here. See related comment
 450                 // in GuiView::event() (QEvent::ShortcutOverride)
 451                 lyx_view_->menuBar()->hide();
 452         }
 453
 454         // In order to avoid bad surprise in the middle of an operation,
 455         // we better stop the blinking cursor...
 456         // the cursor gets restarted in GuiView::restartCursor()
 457         stopBlinkingCursor();
 458         guiApp->processKeySym(key, mod);
 459 }
 460
 461
 462 void GuiWorkArea::dispatch(FuncRequest const & cmd0, KeyModifier mod)
 463 {
 464         // Handle drag&drop
 465         if (cmd0.action == LFUN_FILE_OPEN) {
 466                 lyx_view_->dispatch(cmd0);
 467                 return;
 468         }
 469
 470         FuncRequest cmd;
 471
 472         if (cmd0.action == LFUN_MOUSE_PRESS) {
 473                 if (mod == ShiftModifier)
 474                         cmd = FuncRequest(cmd0, "region-select");
 475                 else if (mod == ControlModifier)
 476                         cmd = FuncRequest(cmd0, "paragraph-select");
 477                 else
 478                         cmd = cmd0;
 479         }
 480         else
 481                 cmd = cmd0;
 482
 483         bool const notJustMovingTheMouse =
 484                 cmd.action != LFUN_MOUSE_MOTION || cmd.button() != mouse_button::none;
 485
 486         // In order to avoid bad surprise in the middle of an operation, we better stop
 487         // the blinking cursor.
 488         if (notJustMovingTheMouse)
 489                 stopBlinkingCursor();
 490
 491         buffer_view_->mouseEventDispatch(cmd);
 492
 493         // Skip these when selecting
 494         if (cmd.action != LFUN_MOUSE_MOTION) {
 495                 completer_->updateVisibility(false, false);
 496                 lyx_view_->updateDialogs();
 497                 lyx_view_->updateStatusBar();
 498         }
 499
 500         // GUI tweaks except with mouse motion with no button pressed.
 501         if (notJustMovingTheMouse) {
 502                 // Slight hack: this is only called currently when we
 503                 // clicked somewhere, so we force through the display
 504                 // of the new status here.
 505                 lyx_view_->clearMessage();
 506
 507                 // Show the cursor immediately after any operation
 508                 startBlinkingCursor();
 509         }
 510 }
 511
 512
 513 void GuiWorkArea::resizeBufferView()
 514 {
 515         // WARNING: Please don't put any code that will trigger a repaint here!
 516         // We are already inside a paint event.
 517         lyx_view_->setBusy(true);
 518         Point p;
 519         int h = 0;
 520         buffer_view_->cursorPosAndHeight(p, h);
 521         bool const cursor_in_view = buffer_view_->cursorInView(p, h);
 522         buffer_view_->resize(viewport()->width(), viewport()->height());
 523         if (cursor_in_view)
 524                 buffer_view_->scrollToCursor();
 525         updateScreen();
 526
 527         // Update scrollbars which might have changed due different
 528         // BufferView dimension. This is especially important when the
 529         // BufferView goes from zero-size to the real-size for the first time,
 530         // as the scrollbar paramters are then set for the first time.
 531         updateScrollbar();
 532
 533         lyx_view_->updateLayoutList();
 534         lyx_view_->setBusy(false);
 535         need_resize_ = false;
 536 }
 537
 538
 539 void GuiWorkArea::showCursor()
 540 {
 541         if (cursor_visible_)
 542                 return;
 543
 544         // RTL or not RTL
 545         bool l_shape = false;
 546         Font const & realfont = buffer_view_->cursor().real_current_font;
 547         BufferParams const & bp = buffer_view_->buffer().params();
 548         bool const samelang = realfont.language() == bp.language;
 549         bool const isrtl = realfont.isVisibleRightToLeft();
 550
 551         if (!samelang || isrtl != bp.language->rightToLeft())
 552                 l_shape = true;
 553
 554         // The ERT language hack needs fixing up
 555         if (realfont.language() == latex_language)
 556                 l_shape = false;
 557
 558         Point p;
 559         int h = 0;
 560         buffer_view_->cursorPosAndHeight(p, h);
 561         // show cursor on screen
 562         Cursor & cur = buffer_view_->cursor();
 563         bool completable = cur.inset().showCompletionCursor()
 564                 && completer_->completionAvailable()
 565                 && !completer_->popupVisible()
 566                 && !completer_->inlineVisible();
 567         if (buffer_view_->cursorInView(p, h)) {
 568                 cursor_visible_ = true;
 569                 showCursor(p.x_, p.y_, h, l_shape, isrtl, completable);
 570         }
 571 }
 572
 573
 574 void GuiWorkArea::hideCursor()
 575 {
 576         if (!cursor_visible_)
 577                 return;
 578
 579         cursor_visible_ = false;
 580         removeCursor();
 581 }
 582
 583
 584 void GuiWorkArea::toggleCursor()
 585 {
 586         if (cursor_visible_)
 587                 hideCursor();
 588         else
 589                 showCursor();
 590 }
 591
 592
 593 void GuiWorkArea::updateScrollbar()
 594 {
 595         ScrollbarParameters const & scroll_ = buffer_view_->scrollbarParameters();
 596         // WARNING: don't touch at the scrollbar value like this:
 597         //   verticalScrollBar()->setValue(scroll_.position);
 598         // because this would cause a recursive signal/slot calling with
 599         // GuiWorkArea::scrollTo
 600         verticalScrollBar()->setRange(scroll_.min, scroll_.max);
 601         verticalScrollBar()->setPageStep(scroll_.page_step);
 602         verticalScrollBar()->setSingleStep(scroll_.single_step);
 603         verticalScrollBar()->setSliderPosition(scroll_.position);
 604 }
 605
 606
 607 void GuiWorkArea::scrollTo(int value)
 608 {
 609         stopBlinkingCursor();
 610         buffer_view_->scrollDocView(value);
 611
 612         if (lyxrc.cursor_follows_scrollbar) {
 613                 buffer_view_->setCursorFromScrollbar();
 614                 lyx_view_->updateLayoutList();
 615         }
 616         // Show the cursor immediately after any operation.
 617         startBlinkingCursor();
 618         QApplication::syncX();
 619 }
 620
 621
 622 bool GuiWorkArea::event(QEvent * e)
 623 {
 624         switch (e->type()) {
 625         case QEvent::ToolTip: {
 626                 QHelpEvent * helpEvent = static_cast<QHelpEvent *>(e);
 627                 if (lyxrc.use_tooltip) {
 628                         QPoint pos = helpEvent->pos();
 629                         if (pos.x() < viewport()->width()) {
 630                                 QString s = toqstr(buffer_view_->toolTip(pos.x(), pos.y()));
 631                                 QToolTip::showText(helpEvent->globalPos(), s);
 632                         }
 633                         else
 634                                 QToolTip::hideText();
 635                 }
 636                 // Don't forget to accept the event!
 637                 e->accept();
 638                 return true;
 639         }
 640
 641         case QEvent::ShortcutOverride: {
 642                 // We catch this event in order to catch the Tab or Shift+Tab key press
 643                 // which are otherwise reserved to focus switching between controls
 644                 // within a dialog.
 645                 QKeyEvent * ke = static_cast<QKeyEvent*>(e);
 646                 if ((ke->key() != Qt::Key_Tab && ke->key() != Qt::Key_Backtab)
 647                         || ke->modifiers() & Qt::ControlModifier)
 648                         return QAbstractScrollArea::event(e);
 649                 keyPressEvent(ke);
 650                 return true;
 651         }
 652
 653         default:
 654                 return QAbstractScrollArea::event(e);
 655         }
 656         return false;
 657 }
 658
 659
 660 void GuiWorkArea::contextMenuEvent(QContextMenuEvent * e)
 661 {
 662         QPoint pos;
 663         if (e->reason() == QContextMenuEvent::Mouse)
 664                 // the position is set on mouse press
 665                 pos = context_target_pos_;
 666         else
 667                 pos = e->pos();
 668         Cursor const & cur = buffer_view_->cursor();
 669         if (e->reason() == QContextMenuEvent::Keyboard && cur.inTexted()) {
 670                 // Do not access the context menu of math right in front of before
 671                 // the cursor. This does not work when the cursor is in text.
 672                 Inset * inset = cur.paragraph().getInset(cur.pos());
 673                 if (inset && inset->asInsetMath())
 674                         --pos.rx();
 675                 else if (cur.pos() > 0) {
 676                         Inset * inset = cur.paragraph().getInset(cur.pos() - 1);
 677                         if (inset)
 678                                 ++pos.rx();
 679                 }
 680         }
 681         docstring name = buffer_view_->contextMenu(pos.x(), pos.y());
 682         if (name.empty()) {
 683                 QAbstractScrollArea::contextMenuEvent(e);
 684                 return;
 685         }
 686         QMenu * menu = guiApp->menus().menu(toqstr(name), *lyx_view_);
 687         if (!menu) {
 688                 QAbstractScrollArea::contextMenuEvent(e);
 689                 return;
 690         }
 691         // Position the menu to the right.
 692         // FIXME: menu position should be different for RTL text.
 693         menu->exec(e->globalPos());
 694         e->accept();
 695 }
 696
 697
 698 void GuiWorkArea::focusInEvent(QFocusEvent * e)
 699 {
 700         /*
 701         LYXERR(Debug::DEBUG, "GuiWorkArea::focusInEvent(): " << this << std::endl);
 702         GuiWorkArea * old_gwa = theGuiApp()->currentView()->currentWorkArea();
 703         if (old_gwa)
 704                 old_gwa->stopBlinkingCursor();
 705         lyx_view_->setCurrentWorkArea(this);
 706         */
 707
 708         if (lyx_view_->currentWorkArea() != this)
 709                 lyx_view_->setCurrentWorkArea(this);
 710
 711         startBlinkingCursor();
 712         QAbstractScrollArea::focusInEvent(e);
 713 }
 714
 715
 716 void GuiWorkArea::focusOutEvent(QFocusEvent * e)
 717 {
 718         LYXERR(Debug::DEBUG, "GuiWorkArea::focusOutEvent(): " << this << std::endl);
 719         stopBlinkingCursor();
 720         QAbstractScrollArea::focusOutEvent(e);
 721 }
 722
 723
 724 void GuiWorkArea::mousePressEvent(QMouseEvent * e)
 725 {
 726         if (dc_event_.active && dc_event_ == *e) {
 727                 dc_event_.active = false;
 728                 FuncRequest cmd(LFUN_MOUSE_TRIPLE, e->x(), e->y(),
 729                         q_button_state(e->button()));
 730                 dispatch(cmd);
 731                 e->accept();
 732                 return;
 733         }
 734
 735         if (e->button() == Qt::RightButton)
 736                 context_target_pos_ = e->pos();
 737
 738         inputContext()->reset();
 739
 740         FuncRequest const cmd(LFUN_MOUSE_PRESS, e->x(), e->y(),
 741                 q_button_state(e->button()));
 742         dispatch(cmd, q_key_state(e->modifiers()));
 743         e->accept();
 744 }
 745
 746
 747 void GuiWorkArea::mouseReleaseEvent(QMouseEvent * e)
 748 {
 749         if (synthetic_mouse_event_.timeout.running())
 750                 synthetic_mouse_event_.timeout.stop();
 751
 752         FuncRequest const cmd(LFUN_MOUSE_RELEASE, e->x(), e->y(),
 753                               q_button_state(e->button()));
 754         dispatch(cmd);
 755         e->accept();
 756 }
 757
 758
 759 void GuiWorkArea::mouseMoveEvent(QMouseEvent * e)
 760 {
 761         // we kill the triple click if we move
 762         doubleClickTimeout();
 763         FuncRequest cmd(LFUN_MOUSE_MOTION, e->x(), e->y(),
 764                 q_motion_state(e->buttons()));
 765
 766         e->accept();
 767
 768         // If we're above or below the work area...
 769         if (e->y() <= 20 || e->y() >= viewport()->height() - 20) {
 770                 // Make sure only a synthetic event can cause a page scroll,
 771                 // so they come at a steady rate:
 772                 if (e->y() <= 20)
 773                         // _Force_ a scroll up:
 774                         cmd.y = -40;
 775                 else
 776                         cmd.y = viewport()->height();
 777                 // Store the event, to be handled when the timeout expires.
 778                 synthetic_mouse_event_.cmd = cmd;
 779
 780                 if (synthetic_mouse_event_.timeout.running())
 781                         // Discard the event. Note that it _may_ be handled
 782                         // when the timeout expires if
 783                         // synthetic_mouse_event_.cmd has not been overwritten.
 784                         // Ie, when the timeout expires, we handle the
 785                         // most recent event but discard all others that
 786                         // occurred after the one used to start the timeout
 787                         // in the first place.
 788                         return;
 789
 790                 synthetic_mouse_event_.restart_timeout = true;
 791                 synthetic_mouse_event_.timeout.start();
 792                 // Fall through to handle this event...
 793
 794         } else if (synthetic_mouse_event_.timeout.running()) {
 795                 // Store the event, to be possibly handled when the timeout
 796                 // expires.
 797                 // Once the timeout has expired, normal control is returned
 798                 // to mouseMoveEvent (restart_timeout = false).
 799                 // This results in a much smoother 'feel' when moving the
 800                 // mouse back into the work area.
 801                 synthetic_mouse_event_.cmd = cmd;
 802                 synthetic_mouse_event_.restart_timeout = false;
 803                 return;
 804         }
 805
 806         // Has anything changed on-screen since the last QMouseEvent
 807         // was received?
 808         if (e->x() == synthetic_mouse_event_.x_old
 809                 && e->y() == synthetic_mouse_event_.y_old
 810                 && synthetic_mouse_event_.min_scrollbar_old == verticalScrollBar()->minimum()
 811                 && synthetic_mouse_event_.max_scrollbar_old == verticalScrollBar()->maximum()) {
 812                 // Nothing changed on-screen since the last QMouseEvent.
 813                 return;
 814         }
 815
 816         // Yes something has changed. Store the params used to check this.
 817         synthetic_mouse_event_.x_old = e->x();
 818         synthetic_mouse_event_.y_old = e->y();
 819         synthetic_mouse_event_.min_scrollbar_old = verticalScrollBar()->minimum();
 820         synthetic_mouse_event_.max_scrollbar_old = verticalScrollBar()->maximum();
 821
 822         // ... and dispatch the event to the LyX core.
 823         dispatch(cmd);
 824 }
 825
 826
 827 void GuiWorkArea::wheelEvent(QWheelEvent * ev)
 828 {
 829         // Wheel rotation by one notch results in a delta() of 120 (see
 830         // documentation of QWheelEvent)
 831         int const delta = ev->delta() / 120;
 832         if (ev->modifiers() & Qt::ControlModifier) {
 833                 docstring arg = convert<docstring>(5 * delta);
 834                 lyx::dispatch(FuncRequest(LFUN_BUFFER_ZOOM_IN, arg));
 835                 return;
 836         }
 837
 838         // Take into account the desktop wide settings.
 839         int const lines = qApp->wheelScrollLines();
 840         int const page_step = verticalScrollBar()->pageStep();
 841         // Test if the wheel mouse is set to one screen at a time.
 842         int scroll_value = lines > page_step
 843                 ? page_step : lines * verticalScrollBar()->singleStep();
 844
 845         // Take into account the rotation.
 846         scroll_value *= delta;
 847
 848         // Take into account user preference.
 849         scroll_value *= lyxrc.mouse_wheel_speed;
 850         LYXERR(Debug::SCROLLING, "wheelScrollLines = " << lines
 851                         << " delta = " << delta << " scroll_value = " << scroll_value
 852                         << " page_step = " << page_step);
 853         // Now scroll.
 854         verticalScrollBar()->setValue(verticalScrollBar()->value() - scroll_value);
 855
 856         ev->accept();
 857 }
 858
 859
 860 void GuiWorkArea::generateSyntheticMouseEvent()
 861 {
 862         // Set things off to generate the _next_ 'pseudo' event.
 863         if (synthetic_mouse_event_.restart_timeout)
 864                 synthetic_mouse_event_.timeout.start();
 865
 866         // Has anything changed on-screen since the last timeout signal
 867         // was received?
 868         int const min_scrollbar = verticalScrollBar()->minimum();
 869         int const max_scrollbar = verticalScrollBar()->maximum();
 870         if (min_scrollbar == synthetic_mouse_event_.min_scrollbar_old
 871                 && max_scrollbar == synthetic_mouse_event_.max_scrollbar_old) {
 872                 return;
 873         }
 874         // Yes it has. Store the params used to check this.
 875         synthetic_mouse_event_.min_scrollbar_old = min_scrollbar;
 876         synthetic_mouse_event_.max_scrollbar_old = max_scrollbar;
 877         // ... and dispatch the event to the LyX core.
 878         dispatch(synthetic_mouse_event_.cmd);
 879 }
 880
 881
 882 void GuiWorkArea::keyPressEvent(QKeyEvent * ev)
 883 {
 884         // Do not process here some keys if dialog_mode_ is set
 885         if (dialog_mode_
 886                 && (ev->modifiers() == Qt::NoModifier
 887                     || ev->modifiers() == Qt::ShiftModifier)
 888                 && (ev->key() == Qt::Key_Escape
 889                     || ev->key() == Qt::Key_Enter
 890                     || ev->key() == Qt::Key_Return)
 891             ) {
 892                 ev->ignore();
 893                 return;
 894         }
 895
 896         // intercept some keys if completion popup is visible
 897         if (completer_->popupVisible()) {
 898                 switch (ev->key()) {
 899                 case Qt::Key_Enter:
 900                 case Qt::Key_Return:
 901                         completer_->activate();
 902                         ev->accept();
 903                         return;
 904                 }
 905         }
 906
 907         // do nothing if there are other events
 908         // (the auto repeated events come too fast)
 909         // \todo FIXME: remove hard coded Qt keys, process the key binding
 910 #ifdef Q_WS_X11
 911         if (XEventsQueued(QX11Info::display(), 0) > 1 && ev->isAutoRepeat()
 912                         && (Qt::Key_PageDown || Qt::Key_PageUp)) {
 913                 LYXERR(Debug::KEY, "system is busy: scroll key event ignored");
 914                 ev->ignore();
 915                 return;
 916         }
 917 #endif
 918
 919         LYXERR(Debug::KEY, " count: " << ev->count() << " text: " << ev->text()
 920                 << " isAutoRepeat: " << ev->isAutoRepeat() << " key: " << ev->key());
 921
 922         KeySymbol sym;
 923         setKeySymbol(&sym, ev);
 924         if (sym.isOK()) {
 925                 processKeySym(sym, q_key_state(ev->modifiers()));
 926                 ev->accept();
 927         } else {
 928                 ev->ignore();
 929         }
 930 }
 931
 932
 933 void GuiWorkArea::doubleClickTimeout()
 934 {
 935         dc_event_.active = false;
 936 }
 937
 938
 939 void GuiWorkArea::mouseDoubleClickEvent(QMouseEvent * ev)
 940 {
 941         dc_event_ = DoubleClick(ev);
 942         QTimer::singleShot(QApplication::doubleClickInterval(), this,
 943                            SLOT(doubleClickTimeout()));
 944         FuncRequest cmd(LFUN_MOUSE_DOUBLE,
 945                         ev->x(), ev->y(),
 946                         q_button_state(ev->button()));
 947         dispatch(cmd);
 948         ev->accept();
 949 }
 950
 951
 952 void GuiWorkArea::resizeEvent(QResizeEvent * ev)
 953 {
 954         QAbstractScrollArea::resizeEvent(ev);
 955         need_resize_ = true;
 956         ev->accept();
 957 }
 958
 959
 960 void GuiWorkArea::update(int x, int y, int w, int h)
 961 {
 962         viewport()->repaint(x, y, w, h);
 963 }
 964
 965
 966 void GuiWorkArea::paintEvent(QPaintEvent * ev)
 967 {
 968         QRect const rc = ev->rect();
 969         // LYXERR(Debug::PAINTING, "paintEvent begin: x: " << rc.x()
 970         //      << " y: " << rc.y() << " w: " << rc.width() << " h: " << rc.height());
 971
 972         if (need_resize_) {
 973                 screen_ = QPixmap(viewport()->width(), viewport()->height());
 974                 resizeBufferView();
 975                 hideCursor();
 976                 showCursor();
 977         }
 978
 979         QPainter pain(viewport());
 980         pain.drawPixmap(rc, screen_, rc);
 981         cursor_->draw(pain);
 982         ev->accept();
 983 }
 984
 985
 986 void GuiWorkArea::updateScreen()
 987 {
 988         GuiPainter pain(&screen_);
 989         buffer_view_->draw(pain);
 990 }
 991
 992
 993 void GuiWorkArea::showCursor(int x, int y, int h,
 994         bool l_shape, bool rtl, bool completable)
 995 {
 996         if (schedule_redraw_) {
 997                 // This happens when a graphic conversion is finished. As we don't know
 998                 // the size of the new graphics, it's better the update everything.
 999                 // We can't use redraw() here because this would trigger a infinite
1000                 // recursive loop with showCursor().
1001                 buffer_view_->resize(viewport()->width(), viewport()->height());
1002                 updateScreen();
1003                 updateScrollbar();
1004                 viewport()->update(QRect(0, 0, viewport()->width(), viewport()->height()));
1005                 schedule_redraw_ = false;
1006                 // Show the cursor immediately after the update.
1007                 hideCursor();
1008                 toggleCursor();
1009                 return;
1010         }
1011
1012         cursor_->update(x, y, h, l_shape, rtl, completable);
1013         cursor_->show();
1014         viewport()->update(cursor_->rect());
1015 }
1016
1017
1018 void GuiWorkArea::removeCursor()
1019 {
1020         cursor_->hide();
1021         //if (!qApp->focusWidget())
1022                 viewport()->update(cursor_->rect());
1023 }
1024
1025
1026 void GuiWorkArea::inputMethodEvent(QInputMethodEvent * e)
1027 {
1028         QString const & commit_string = e->commitString();
1029         docstring const & preedit_string
1030                 = qstring_to_ucs4(e->preeditString());
1031
1032         if (!commit_string.isEmpty()) {
1033
1034                 LYXERR(Debug::KEY, "preeditString: " << e->preeditString()
1035                         << " commitString: " << e->commitString());
1036
1037                 int key = 0;
1038
1039                 // FIXME Iwami 04/01/07: we should take care also of UTF16 surrogates here.
1040                 for (int i = 0; i != commit_string.size(); ++i) {
1041                         QKeyEvent ev(QEvent::KeyPress, key, Qt::NoModifier, commit_string[i]);
1042                         keyPressEvent(&ev);
1043                 }
1044         }
1045
1046         // Hide the cursor during the kana-kanji transformation.
1047         if (preedit_string.empty())
1048                 startBlinkingCursor();
1049         else
1050                 stopBlinkingCursor();
1051
1052         // last_width : for checking if last preedit string was/wasn't empty.
1053         static bool last_width = false;
1054         if (!last_width && preedit_string.empty()) {
1055                 // if last_width is last length of preedit string.
1056                 e->accept();
1057                 return;
1058         }
1059
1060         GuiPainter pain(&screen_);
1061         buffer_view_->updateMetrics();
1062         buffer_view_->draw(pain);
1063         FontInfo font = buffer_view_->cursor().getFont().fontInfo();
1064         FontMetrics const & fm = theFontMetrics(font);
1065         int height = fm.maxHeight();
1066         int cur_x = cursor_->rect().left();
1067         int cur_y = cursor_->rect().bottom();
1068
1069         // redraw area of preedit string.
1070         update(0, cur_y - height, viewport()->width(),
1071                 (height + 1) * preedit_lines_);
1072
1073         if (preedit_string.empty()) {
1074                 last_width = false;
1075                 preedit_lines_ = 1;
1076                 e->accept();
1077                 return;
1078         }
1079         last_width = true;
1080
1081         // att : stores an IM attribute.
1082         QList<QInputMethodEvent::Attribute> const & att = e->attributes();
1083
1084         // get attributes of input method cursor.
1085         // cursor_pos : cursor position in preedit string.
1086         size_t cursor_pos = 0;
1087         bool cursor_is_visible = false;
1088         for (int i = 0; i != att.size(); ++i) {
1089                 if (att.at(i).type == QInputMethodEvent::Cursor) {
1090                         cursor_pos = att.at(i).start;
1091                         cursor_is_visible = att.at(i).length != 0;
1092                         break;
1093                 }
1094         }
1095
1096         size_t preedit_length = preedit_string.length();
1097
1098         // get position of selection in input method.
1099         // FIXME: isn't there a way to do this simplier?
1100         // rStart : cursor position in selected string in IM.
1101         size_t rStart = 0;
1102         // rLength : selected string length in IM.
1103         size_t rLength = 0;
1104         if (cursor_pos < preedit_length) {
1105                 for (int i = 0; i != att.size(); ++i) {
1106                         if (att.at(i).type == QInputMethodEvent::TextFormat) {
1107                                 if (att.at(i).start <= int(cursor_pos)
1108                                         && int(cursor_pos) < att.at(i).start + att.at(i).length) {
1109                                                 rStart = att.at(i).start;
1110                                                 rLength = att.at(i).length;
1111                                                 if (!cursor_is_visible)
1112                                                         cursor_pos += rLength;
1113                                                 break;
1114                                 }
1115                         }
1116                 }
1117         }
1118         else {
1119                 rStart = cursor_pos;
1120                 rLength = 0;
1121         }
1122
1123         int const right_margin = buffer_view_->rightMargin();
1124         Painter::preedit_style ps;
1125         // Most often there would be only one line:
1126         preedit_lines_ = 1;
1127         for (size_t pos = 0; pos != preedit_length; ++pos) {
1128                 char_type const typed_char = preedit_string[pos];
1129                 // reset preedit string style
1130                 ps = Painter::preedit_default;
1131
1132                 // if we reached the right extremity of the screen, go to next line.
1133                 if (cur_x + fm.width(typed_char) > viewport()->width() - right_margin) {
1134                         cur_x = right_margin;
1135                         cur_y += height + 1;
1136                         ++preedit_lines_;
1137                 }
1138                 // preedit strings are displayed with dashed underline
1139                 // and partial strings are displayed white on black indicating
1140                 // that we are in selecting mode in the input method.
1141                 // FIXME: rLength == preedit_length is not a changing condition
1142                 // FIXME: should be put out of the loop.
1143                 if (pos >= rStart
1144                         && pos < rStart + rLength
1145                         && !(cursor_pos < rLength && rLength == preedit_length))
1146                         ps = Painter::preedit_selecting;
1147
1148                 if (pos == cursor_pos
1149                         && (cursor_pos < rLength && rLength == preedit_length))
1150                         ps = Painter::preedit_cursor;
1151
1152                 // draw one character and update cur_x.
1153                 cur_x += pain.preeditText(cur_x, cur_y, typed_char, font, ps);
1154         }
1155
1156         // update the preedit string screen area.
1157         update(0, cur_y - preedit_lines_*height, viewport()->width(),
1158                 (height + 1) * preedit_lines_);
1159
1160         // Don't forget to accept the event!
1161         e->accept();
1162 }
1163
1164
1165 QVariant GuiWorkArea::inputMethodQuery(Qt::InputMethodQuery query) const
1166 {
1167         QRect cur_r(0, 0, 0, 0);
1168         switch (query) {
1169                 // this is the CJK-specific composition window position and
1170                 // the context menu position when the menu key is pressed.
1171                 case Qt::ImMicroFocus:
1172                         cur_r = cursor_->rect();
1173                         if (preedit_lines_ != 1)
1174                                 cur_r.moveLeft(10);
1175                         cur_r.moveBottom(cur_r.bottom()
1176                                 + cur_r.height() * (preedit_lines_ - 1));
1177                         // return lower right of cursor in LyX.
1178                         return cur_r;
1179                 default:
1180                         return QWidget::inputMethodQuery(query);
1181         }
1182 }
1183
1184
1185 void GuiWorkArea::updateWindowTitle()
1186 {
1187         docstring maximize_title;
1188         docstring minimize_title;
1189
1190         Buffer & buf = buffer_view_->buffer();
1191         FileName const fileName = buf.fileName();
1192         if (!fileName.empty()) {
1193                 maximize_title = fileName.displayName(30);
1194                 minimize_title = from_utf8(fileName.onlyFileName());
1195                 if (buf.lyxvc().inUse()) {
1196                         if (buf.lyxvc().locker().empty())
1197                                 maximize_title +=  _(" (version control)");
1198                         else
1199                                 maximize_title +=  _(" (version control, locking)");
1200                 }
1201                 if (!buf.isClean()) {
1202                         maximize_title += _(" (changed)");
1203                         minimize_title += char_type('*');
1204                 }
1205                 if (buf.isReadonly())
1206                         maximize_title += _(" (read only)");
1207         }
1208
1209         QString title = windowTitle();
1210         QString new_title = toqstr(maximize_title);
1211         if (title == new_title)
1212                 return;
1213
1214         QWidget::setWindowTitle(new_title);
1215         QWidget::setWindowIconText(toqstr(minimize_title));
1216         titleChanged(this);
1217 }
1218
1219
1220 void GuiWorkArea::setReadOnly(bool)
1221 {
1222         updateWindowTitle();
1223         if (this == lyx_view_->currentWorkArea())
1224                 lyx_view_->updateDialogs();
1225 }
1226
1227
1228 bool GuiWorkArea::isFullScreen()
1229 {
1230         return lyx_view_ && lyx_view_->isFullScreen();
1231 }
1232
1233
1234 ////////////////////////////////////////////////////////////////////
1235 //
1236 // EmbeddedWorkArea
1237 //
1238 ////////////////////////////////////////////////////////////////////
1239
1240
1241 EmbeddedWorkArea::EmbeddedWorkArea(QWidget * w): GuiWorkArea(w)
1242 {
1243         buffer_ = theBufferList().newBuffer(
1244                 support::FileName::tempName().absFilename() + "_embedded.internal");
1245         buffer_->setUnnamed(true);
1246         buffer_->setFullyLoaded(true);
1247         setBuffer(*buffer_);
1248         setDialogMode(true);
1249 }
1250
1251
1252 EmbeddedWorkArea::~EmbeddedWorkArea()
1253 {
1254         // No need to destroy buffer and bufferview here, because it is done
1255         // in theBuffeerList() destruction loop at application exit
1256 }
1257
1258
1259 void EmbeddedWorkArea::closeEvent(QCloseEvent * ev)
1260 {
1261         disable();
1262         GuiWorkArea::closeEvent(ev);
1263 }
1264
1265
1266 void EmbeddedWorkArea::hideEvent(QHideEvent * ev)
1267 {
1268         disable();
1269         GuiWorkArea::hideEvent(ev);
1270 }
1271
1272
1273 void EmbeddedWorkArea::disable()
1274 {
1275         stopBlinkingCursor();
1276         if (view().currentWorkArea() != this)
1277                 return;
1278         LASSERT(view().currentMainWorkArea(), /* */);
1279         view().setCurrentWorkArea(view().currentMainWorkArea());
1280 }
1281
1282 ////////////////////////////////////////////////////////////////////
1283 //
1284 // TabWorkArea
1285 //
1286 ////////////////////////////////////////////////////////////////////
1287
1288 #ifdef Q_WS_MACX
1289 class NoTabFrameMacStyle : public QMacStyle {
1290 public:
1291         ///
1292         QRect subElementRect(SubElement element, const QStyleOption * option,
1293                              const QWidget * widget = 0) const
1294         {
1295                 QRect rect = QMacStyle::subElementRect(element, option, widget);
1296                 bool noBar = static_cast<QTabWidget const *>(widget)->count() <= 1;
1297
1298                 // The Qt Mac style puts the contents into a 3 pixel wide box
1299                 // which looks very ugly and not like other Mac applications.
1300                 // Hence we remove this here, and moreover the 16 pixel round
1301                 // frame above if the tab bar is hidden.
1302                 if (element == QStyle::SE_TabWidgetTabContents) {
1303                         rect.adjust(- rect.left(), 0, rect.left(), 0);
1304                         if (noBar)
1305                                 rect.setTop(0);
1306                 }
1307
1308                 return rect;
1309         }
1310 };
1311
1312 NoTabFrameMacStyle noTabFrameMacStyle;
1313 #endif
1314
1315
1316 TabWorkArea::TabWorkArea(QWidget * parent)
1317         : QTabWidget(parent), clicked_tab_(-1)
1318 {
1319 #ifdef Q_WS_MACX
1320         setStyle(&noTabFrameMacStyle);
1321 #endif
1322 #if QT_VERSION < 0x040500
1323         lyxrc.single_close_tab_button = true;
1324 #endif
1325
1326         QPalette pal = palette();
1327         pal.setColor(QPalette::Active, QPalette::Button,
1328                 pal.color(QPalette::Active, QPalette::Window));
1329         pal.setColor(QPalette::Disabled, QPalette::Button,
1330                 pal.color(QPalette::Disabled, QPalette::Window));
1331         pal.setColor(QPalette::Inactive, QPalette::Button,
1332                 pal.color(QPalette::Inactive, QPalette::Window));
1333
1334         QObject::connect(this, SIGNAL(currentChanged(int)),
1335                 this, SLOT(on_currentTabChanged(int)));
1336
1337         closeBufferButton = new QToolButton(this);
1338         closeBufferButton->setPalette(pal);
1339         // FIXME: rename the icon to closebuffer.png
1340         closeBufferButton->setIcon(QIcon(getPixmap("images/", "closetab", "png")));
1341         closeBufferButton->setText("Close File");
1342         closeBufferButton->setAutoRaise(true);
1343         closeBufferButton->setCursor(Qt::ArrowCursor);
1344         closeBufferButton->setToolTip(qt_("Close File"));
1345         closeBufferButton->setEnabled(true);
1346         QObject::connect(closeBufferButton, SIGNAL(clicked()),
1347                 this, SLOT(closeCurrentBuffer()));
1348         setCornerWidget(closeBufferButton, Qt::TopRightCorner);
1349
1350         // setup drag'n'drop
1351         QTabBar* tb = new DragTabBar;
1352         connect(tb, SIGNAL(tabMoveRequested(int, int)),
1353                 this, SLOT(moveTab(int, int)));
1354         tb->setElideMode(Qt::ElideNone);
1355         setTabBar(tb);
1356
1357         // make us responsible for the context menu of the tabbar
1358         tb->setContextMenuPolicy(Qt::CustomContextMenu);
1359         connect(tb, SIGNAL(customContextMenuRequested(const QPoint &)),
1360                 this, SLOT(showContextMenu(const QPoint &)));
1361 #if QT_VERSION >= 0x040500
1362         connect(tb, SIGNAL(tabCloseRequested(int)),
1363                 this, SLOT(closeTab(int)));
1364 #endif
1365
1366         setUsesScrollButtons(true);
1367 }
1368
1369
1370 void TabWorkArea::setFullScreen(bool full_screen)
1371 {
1372         for (int i = 0; i != count(); ++i) {
1373                 if (GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i)))
1374                         wa->setFullScreen(full_screen);
1375         }
1376
1377         if (lyxrc.full_screen_tabbar)
1378                 showBar(!full_screen && count() > 1);
1379 }
1380
1381
1382 void TabWorkArea::showBar(bool show)
1383 {
1384         tabBar()->setEnabled(show);
1385         tabBar()->setVisible(show);
1386         closeBufferButton->setVisible(show && lyxrc.single_close_tab_button);
1387 #if QT_VERSION >= 0x040500
1388         setTabsClosable(!lyxrc.single_close_tab_button);
1389 #endif
1390 }
1391
1392
1393 GuiWorkArea * TabWorkArea::currentWorkArea()
1394 {
1395         if (count() == 0)
1396                 return 0;
1397
1398         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(currentWidget());
1399         LASSERT(wa, /**/);
1400         return wa;
1401 }
1402
1403
1404 GuiWorkArea * TabWorkArea::workArea(Buffer & buffer)
1405 {
1406         for (int i = 0; i != count(); ++i) {
1407                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i));
1408                 LASSERT(wa, return 0);
1409                 if (&wa->bufferView().buffer() == &buffer)
1410                         return wa;
1411         }
1412         return 0;
1413 }
1414
1415
1416 void TabWorkArea::closeAll()
1417 {
1418         while (count()) {
1419                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(0));
1420                 LASSERT(wa, /**/);
1421                 removeTab(0);
1422                 delete wa;
1423         }
1424 }
1425
1426
1427 bool TabWorkArea::setCurrentWorkArea(GuiWorkArea * work_area)
1428 {
1429         LASSERT(work_area, /**/);
1430         int index = indexOf(work_area);
1431         if (index == -1)
1432                 return false;
1433
1434         if (index == currentIndex())
1435                 // Make sure the work area is up to date.
1436                 on_currentTabChanged(index);
1437         else
1438                 // Switch to the work area.
1439                 setCurrentIndex(index);
1440         work_area->setFocus();
1441
1442         return true;
1443 }
1444
1445
1446 GuiWorkArea * TabWorkArea::addWorkArea(Buffer & buffer, GuiView & view)
1447 {
1448         GuiWorkArea * wa = new GuiWorkArea(buffer, view);
1449         wa->setUpdatesEnabled(false);
1450         // Hide tabbar if there's no tab (avoid a resize and a flashing tabbar
1451         // when hiding it again below).
1452         if (!(currentWorkArea() && currentWorkArea()->isFullScreen()))
1453                 showBar(count() > 0);
1454         addTab(wa, wa->windowTitle());
1455         QObject::connect(wa, SIGNAL(titleChanged(GuiWorkArea *)),
1456                 this, SLOT(updateTabTexts()));
1457         if (currentWorkArea() && currentWorkArea()->isFullScreen())
1458                 setFullScreen(true);
1459         else
1460                 // Hide tabbar if there's only one tab.
1461                 showBar(count() > 1);
1462
1463         updateTabTexts();
1464
1465         return wa;
1466 }
1467
1468
1469 bool TabWorkArea::removeWorkArea(GuiWorkArea * work_area)
1470 {
1471         LASSERT(work_area, return false);
1472         int index = indexOf(work_area);
1473         if (index == -1)
1474                 return false;
1475
1476         work_area->setUpdatesEnabled(false);
1477         removeTab(index);
1478         delete work_area;
1479
1480         if (count()) {
1481                 // make sure the next work area is enabled.
1482                 currentWidget()->setUpdatesEnabled(true);
1483                 if (currentWorkArea() && currentWorkArea()->isFullScreen())
1484                         setFullScreen(true);
1485                 else
1486                         // Show tabbar only if there's more than one tab.
1487                         showBar(count() > 1);
1488         } else
1489                 lastWorkAreaRemoved();
1490
1491         updateTabTexts();
1492
1493         return true;
1494 }
1495
1496
1497 void TabWorkArea::on_currentTabChanged(int i)
1498 {
1499         // returns e.g. on application destruction
1500         if (i == -1)
1501                 return;
1502         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i));
1503         LASSERT(wa, return);
1504         BufferView & bv = wa->bufferView();
1505         bv.cursor().fixIfBroken();
1506         bv.updateMetrics();
1507         wa->setUpdatesEnabled(true);
1508         wa->redraw();
1509         wa->setFocus();
1510         ///
1511         currentWorkAreaChanged(wa);
1512
1513         LYXERR(Debug::GUI, "currentTabChanged " << i
1514                 << "File" << bv.buffer().absFileName());
1515 }
1516
1517
1518 void TabWorkArea::closeCurrentBuffer()
1519 {
1520         GuiWorkArea * wa;
1521         if (clicked_tab_ == -1)
1522                 wa = currentWorkArea();
1523         else {
1524                 wa = dynamic_cast<GuiWorkArea *>(widget(clicked_tab_));
1525                 LASSERT(wa, /**/);
1526         }
1527         wa->view().closeWorkArea(wa);
1528 }
1529
1530
1531 void TabWorkArea::closeCurrentTab()
1532 {
1533         GuiWorkArea * wa;
1534         if (clicked_tab_ == -1)
1535                 wa = currentWorkArea();
1536         else {
1537                 wa = dynamic_cast<GuiWorkArea *>(widget(clicked_tab_));
1538                 LASSERT(wa, /**/);
1539         }
1540         wa->view().hideWorkArea(wa);
1541 }
1542
1543
1544 void TabWorkArea::closeTab(int index)
1545 {
1546         on_currentTabChanged(index);
1547         GuiWorkArea * wa;
1548         if (index == -1)
1549                 wa = currentWorkArea();
1550         else {
1551                 wa = dynamic_cast<GuiWorkArea *>(widget(index));
1552                 LASSERT(wa, /**/);
1553         }
1554         wa->view().hideWorkArea(wa);
1555 }
1556
1557
1558 ///
1559 class DisplayPath {
1560 public:
1561         /// make vector happy
1562         DisplayPath() {}
1563         ///
1564         DisplayPath(int tab, FileName const & filename)
1565                 : tab_(tab)
1566         {
1567                 filename_ = (filename.extension() == "lyx") ?
1568                         toqstr(filename.onlyFileNameWithoutExt())
1569                         : toqstr(filename.onlyFileName());
1570                 postfix_ = toqstr(filename.absoluteFilePath()).
1571                         split("/", QString::SkipEmptyParts);
1572                 postfix_.pop_back();
1573                 abs_ = toqstr(filename.absoluteFilePath());
1574                 dottedPrefix_ = false;
1575         }
1576
1577         /// Absolute path for debugging.
1578         QString abs() const
1579         {
1580                 return abs_;
1581         }
1582         /// Add the first segment from the postfix or three dots to the prefix.
1583         /// Merge multiple dot tripples. In fact dots are added lazily, i.e. only
1584         /// when really needed.
1585         void shiftPathSegment(bool dotted)
1586         {
1587                 if (postfix_.count() <= 0)
1588                         return;
1589
1590                 if (!dotted) {
1591                         if (dottedPrefix_ && !prefix_.isEmpty())
1592                                 prefix_ += ".../";
1593                         prefix_ += postfix_.front() + "/";
1594                 }
1595                 dottedPrefix_ = dotted && !prefix_.isEmpty();
1596                 postfix_.pop_front();
1597         }
1598         ///
1599         QString displayString() const
1600         {
1601                 if (prefix_.isEmpty())
1602                         return filename_;
1603
1604                 bool dots = dottedPrefix_ || !postfix_.isEmpty();
1605                 return prefix_ + (dots ? ".../" : "") + filename_;
1606         }
1607         ///
1608         QString forecastPathString() const
1609         {
1610                 if (postfix_.count() == 0)
1611                         return displayString();
1612
1613                 return prefix_
1614                         + (dottedPrefix_ ? ".../" : "")
1615                         + postfix_.front() + "/";
1616         }
1617         ///
1618         bool final() const { return postfix_.empty(); }
1619         ///
1620         int tab() const { return tab_; }
1621
1622 private:
1623         ///
1624         QString prefix_;
1625         ///
1626         QStringList postfix_;
1627         ///
1628         QString filename_;
1629         ///
1630         QString abs_;
1631         ///
1632         int tab_;
1633         ///
1634         bool dottedPrefix_;
1635 };
1636
1637
1638 ///
1639 bool operator<(DisplayPath const & a, DisplayPath const & b)
1640 {
1641         return a.displayString() < b.displayString();
1642 }
1643
1644 ///
1645 bool operator==(DisplayPath const & a, DisplayPath const & b)
1646 {
1647         return a.displayString() == b.displayString();
1648 }
1649
1650
1651 void TabWorkArea::updateTabTexts()
1652 {
1653         size_t n = count();
1654         if (n == 0)
1655                 return;
1656         std::list<DisplayPath> paths;
1657         typedef std::list<DisplayPath>::iterator It;
1658
1659         // collect full names first: path into postfix, empty prefix and
1660         // filename without extension
1661         for (size_t i = 0; i < n; ++i) {
1662                 GuiWorkArea * i_wa = dynamic_cast<GuiWorkArea *>(widget(i));
1663                 FileName const fn = i_wa->bufferView().buffer().fileName();
1664                 paths.push_back(DisplayPath(i, fn));
1665         }
1666
1667         // go through path segments and see if it helps to make the path more unique
1668         bool somethingChanged = true;
1669         bool allFinal = false;
1670         while (somethingChanged && !allFinal) {
1671                 // adding path segments changes order
1672                 paths.sort();
1673
1674                 LYXERR(Debug::GUI, "updateTabTexts() iteration start");
1675                 somethingChanged = false;
1676                 allFinal = true;
1677
1678                 // find segments which are not unique (i.e. non-atomic)
1679                 It it = paths.begin();
1680                 It segStart = it;
1681                 QString segString = it->displayString();
1682                 for (; it != paths.end(); ++it) {
1683                         // look to the next item
1684                         It next = it;
1685                         ++next;
1686
1687                         // final?
1688                         allFinal = allFinal && it->final();
1689
1690                         LYXERR(Debug::GUI, "it = " << it->abs()
1691                                << " => " << it->displayString());
1692
1693                         // still the same segment?
1694                         QString nextString;
1695                         if ((next != paths.end()
1696                              && (nextString = next->displayString()) == segString))
1697                                 continue;
1698                         LYXERR(Debug::GUI, "segment ended");
1699
1700                         // only a trivial one with one element?
1701                         if (it == segStart) {
1702                                 // start new segment
1703                                 segStart = next;
1704                                 segString = nextString;
1705                                 continue;
1706                         }
1707
1708                         // we found a non-atomic segment segStart <= sit <= it < next.
1709                         // Shift path segments and hope for the best
1710                         // that it makes the path more unique.
1711                         somethingChanged = true;
1712                         It sit = segStart;
1713                         QString dspString = sit->forecastPathString();
1714                         LYXERR(Debug::GUI, "first forecast found for "
1715                                << sit->abs() << " => " << dspString);
1716                         ++sit;
1717                         bool moreUnique = false;
1718                         for (; sit != next; ++sit) {
1719                                 if (sit->forecastPathString() != dspString) {
1720                                         LYXERR(Debug::GUI, "different forecast found for "
1721                                                 << sit->abs() << " => " << sit->forecastPathString());
1722                                         moreUnique = true;
1723                                         break;
1724                                 }
1725                                 LYXERR(Debug::GUI, "same forecast found for "
1726                                         << sit->abs() << " => " << dspString);
1727                         }
1728
1729                         // if the path segment helped, add it. Otherwise add dots
1730                         bool dots = !moreUnique;
1731                         LYXERR(Debug::GUI, "using dots = " << dots);
1732                         for (sit = segStart; sit != next; ++sit) {
1733                                 sit->shiftPathSegment(dots);
1734                                 LYXERR(Debug::GUI, "shifting "
1735                                         << sit->abs() << " => " << sit->displayString());
1736                         }
1737
1738                         // start new segment
1739                         segStart = next;
1740                         segString = nextString;
1741                 }
1742         }
1743
1744         // set new tab titles
1745         for (It it = paths.begin(); it != paths.end(); ++it) {
1746                 GuiWorkArea * i_wa = dynamic_cast<GuiWorkArea *>(widget(it->tab()));
1747                 Buffer & buf = i_wa->bufferView().buffer();
1748                 if (!buf.fileName().empty() && !buf.isClean())
1749                         setTabText(it->tab(), it->displayString() + "*");
1750                 else
1751                         setTabText(it->tab(), it->displayString());
1752         }
1753 }
1754
1755
1756 void TabWorkArea::showContextMenu(const QPoint & pos)
1757 {
1758         // which tab?
1759         clicked_tab_ = static_cast<DragTabBar *>(tabBar())->tabAt(pos);
1760         if (clicked_tab_ == -1)
1761                 return;
1762
1763         // show tab popup
1764         QMenu popup;
1765         popup.addAction(QIcon(getPixmap("images/", "hidetab", "png")),
1766                 qt_("Hide tab"), this, SLOT(closeCurrentTab()));
1767         popup.addAction(QIcon(getPixmap("images/", "closetab", "png")),
1768                 qt_("Close tab"), this, SLOT(closeCurrentBuffer()));
1769         popup.exec(tabBar()->mapToGlobal(pos));
1770
1771         clicked_tab_ = -1;
1772 }
1773
1774
1775 void TabWorkArea::moveTab(int fromIndex, int toIndex)
1776 {
1777         QWidget * w = widget(fromIndex);
1778         QIcon icon = tabIcon(fromIndex);
1779         QString text = tabText(fromIndex);
1780
1781         setCurrentIndex(fromIndex);
1782         removeTab(fromIndex);
1783         insertTab(toIndex, w, icon, text);
1784         setCurrentIndex(toIndex);
1785 }
1786
1787
1788 DragTabBar::DragTabBar(QWidget* parent)
1789         : QTabBar(parent)
1790 {
1791         setAcceptDrops(true);
1792 #if QT_VERSION >= 0x040500
1793         setTabsClosable(!lyxrc.single_close_tab_button);
1794 #endif
1795 }
1796
1797
1798 #if QT_VERSION < 0x040300
1799 int DragTabBar::tabAt(QPoint const & position) const
1800 {
1801         const int max = count();
1802         for (int i = 0; i < max; ++i) {
1803                 if (tabRect(i).contains(position))
1804                         return i;
1805         }
1806         return -1;
1807 }
1808 #endif
1809
1810
1811 void DragTabBar::mousePressEvent(QMouseEvent * event)
1812 {
1813         if (event->button() == Qt::LeftButton)
1814                 dragStartPos_ = event->pos();
1815         QTabBar::mousePressEvent(event);
1816 }
1817
1818
1819 void DragTabBar::mouseMoveEvent(QMouseEvent * event)
1820 {
1821         // If the left button isn't pressed anymore then return
1822         if (!(event->buttons() & Qt::LeftButton))
1823                 return;
1824
1825         // If the distance is too small then return
1826         if ((event->pos() - dragStartPos_).manhattanLength()
1827             < QApplication::startDragDistance())
1828                 return;
1829
1830         // did we hit something after all?
1831         int tab = tabAt(dragStartPos_);
1832         if (tab == -1)
1833                 return;
1834
1835         // simulate button release to remove highlight from button
1836         int i = currentIndex();
1837         QMouseEvent me(QEvent::MouseButtonRelease, dragStartPos_,
1838                 event->button(), event->buttons(), 0);
1839         QTabBar::mouseReleaseEvent(&me);
1840         setCurrentIndex(i);
1841
1842         // initiate Drag
1843         QDrag * drag = new QDrag(this);
1844         QMimeData * mimeData = new QMimeData;
1845         // a crude way to distinguish tab-reodering drops from other ones
1846         mimeData->setData("action", "tab-reordering") ;
1847         drag->setMimeData(mimeData);
1848
1849 #if QT_VERSION >= 0x040300
1850         // get tab pixmap as cursor
1851         QRect r = tabRect(tab);
1852         QPixmap pixmap(r.size());
1853         render(&pixmap, - r.topLeft());
1854         drag->setPixmap(pixmap);
1855         drag->exec();
1856 #else
1857         drag->start(Qt::MoveAction);
1858 #endif
1859
1860 }
1861
1862
1863 void DragTabBar::dragEnterEvent(QDragEnterEvent * event)
1864 {
1865         // Only accept if it's an tab-reordering request
1866         QMimeData const * m = event->mimeData();
1867         QStringList formats = m->formats();
1868         if (formats.contains("action")
1869             && m->data("action") == "tab-reordering")
1870                 event->acceptProposedAction();
1871 }
1872
1873
1874 void DragTabBar::dropEvent(QDropEvent * event)
1875 {
1876         int fromIndex = tabAt(dragStartPos_);
1877         int toIndex = tabAt(event->pos());
1878
1879         // Tell interested objects that
1880         if (fromIndex != toIndex)
1881                 tabMoveRequested(fromIndex, toIndex);
1882         event->acceptProposedAction();
1883 }
1884
1885
1886 } // namespace frontend
1887 } // namespace lyx
1888
1889 #include "moc_GuiWorkArea.cpp"