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         // See #4758.
 325         // delete completer_;
 326 }
 327
 328
 329 void GuiWorkArea::setGuiView(GuiView & gv)
 330 {
 331         lyx_view_ = &gv;
 332 }
 333
 334
 335 void GuiWorkArea::setBuffer(Buffer & buffer)
 336 {
 337         delete buffer_view_;
 338         buffer_view_ = new BufferView(buffer);
 339         buffer.workAreaManager().add(this);
 340
 341         // HACK: Prevents an additional redraw when the scrollbar pops up
 342         // which regularily happens on documents with more than one page.
 343         // The policy  should be set to "Qt::ScrollBarAsNeeded" soon.
 344         // Since we have no geometry information yet, we assume that
 345         // a document needs a scrollbar if there is more then four
 346         // paragraph in the outermost text.
 347         if (buffer.text().paragraphs().size() > 4)
 348                 setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
 349         QTimer::singleShot(50, this, SLOT(fixVerticalScrollBar()));
 350 }
 351
 352
 353 void GuiWorkArea::fixVerticalScrollBar()
 354 {
 355         if (!isFullScreen())
 356                 setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
 357 }
 358
 359
 360 void GuiWorkArea::close()
 361 {
 362         lyx_view_->removeWorkArea(this);
 363 }
 364
 365
 366 void GuiWorkArea::setFullScreen(bool full_screen)
 367 {
 368         buffer_view_->setFullScreen(full_screen);
 369         setFrameStyle(QFrame::NoFrame);
 370         if (full_screen) {
 371                 setFrameStyle(QFrame::NoFrame);
 372                 if (lyxrc.full_screen_scrollbar)
 373                         setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 374         } else
 375                 setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
 376 }
 377
 378
 379 BufferView & GuiWorkArea::bufferView()
 380 {
 381         return *buffer_view_;
 382 }
 383
 384
 385 BufferView const & GuiWorkArea::bufferView() const
 386 {
 387         return *buffer_view_;
 388 }
 389
 390
 391 void GuiWorkArea::stopBlinkingCursor()
 392 {
 393         cursor_timeout_.stop();
 394         hideCursor();
 395 }
 396
 397
 398 void GuiWorkArea::startBlinkingCursor()
 399 {
 400         showCursor();
 401         //we're not supposed to cache this value.
 402         int const time = QApplication::cursorFlashTime() / 2;
 403         if (time <= 0)
 404                 return;
 405         cursor_timeout_.setInterval(time);
 406         cursor_timeout_.start();
 407 }
 408
 409
 410 void GuiWorkArea::redraw(bool update_metrics)
 411 {
 412         if (!isVisible())
 413                 // No need to redraw in this case.
 414                 return;
 415
 416         // No need to do anything if this is the current view. The BufferView
 417         // metrics are already up to date.
 418         if (update_metrics || lyx_view_ != guiApp->currentView()
 419                 || lyx_view_->currentWorkArea() != this) {
 420                 // FIXME: it would be nice to optimize for the off-screen case.
 421                 buffer_view_->updateMetrics();
 422                 buffer_view_->cursor().fixIfBroken();
 423         }
 424
 425         // update cursor position, because otherwise it has to wait until
 426         // the blinking interval is over
 427         if (cursor_visible_) {
 428                 hideCursor();
 429                 showCursor();
 430         }
 431
 432         LYXERR(Debug::WORKAREA, "WorkArea::redraw screen");
 433         updateScreen();
 434         update(0, 0, viewport()->width(), viewport()->height());
 435
 436         /// \warning: scrollbar updating *must* be done after the BufferView is drawn
 437         /// because \c BufferView::updateScrollbar() is called in \c BufferView::draw().
 438         updateScrollbar();
 439         lyx_view_->updateStatusBar();
 440
 441         if (lyxerr.debugging(Debug::WORKAREA))
 442                 buffer_view_->coordCache().dump();
 443 }
 444
 445
 446 void GuiWorkArea::processKeySym(KeySymbol const & key, KeyModifier mod)
 447 {
 448         if (lyx_view_->isFullScreen() && lyx_view_->menuBar()->isVisible()
 449                 && lyxrc.full_screen_menubar) {
 450                 // FIXME HACK: we should not have to do this here. See related comment
 451                 // in GuiView::event() (QEvent::ShortcutOverride)
 452                 lyx_view_->menuBar()->hide();
 453         }
 454
 455         // In order to avoid bad surprise in the middle of an operation,
 456         // we better stop the blinking cursor...
 457         // the cursor gets restarted in GuiView::restartCursor()
 458         stopBlinkingCursor();
 459         guiApp->processKeySym(key, mod);
 460 }
 461
 462
 463 void GuiWorkArea::dispatch(FuncRequest const & cmd0, KeyModifier mod)
 464 {
 465         // Handle drag&drop
 466         if (cmd0.action == LFUN_FILE_OPEN) {
 467                 lyx_view_->dispatch(cmd0);
 468                 return;
 469         }
 470
 471         FuncRequest cmd;
 472
 473         if (cmd0.action == LFUN_MOUSE_PRESS) {
 474                 if (mod == ShiftModifier)
 475                         cmd = FuncRequest(cmd0, "region-select");
 476                 else if (mod == ControlModifier)
 477                         cmd = FuncRequest(cmd0, "paragraph-select");
 478                 else
 479                         cmd = cmd0;
 480         }
 481         else
 482                 cmd = cmd0;
 483
 484         bool const notJustMovingTheMouse =
 485                 cmd.action != LFUN_MOUSE_MOTION || cmd.button() != mouse_button::none;
 486
 487         // In order to avoid bad surprise in the middle of an operation, we better stop
 488         // the blinking cursor.
 489         if (notJustMovingTheMouse)
 490                 stopBlinkingCursor();
 491
 492         buffer_view_->mouseEventDispatch(cmd);
 493
 494         // Skip these when selecting
 495         if (cmd.action != LFUN_MOUSE_MOTION) {
 496                 completer_->updateVisibility(false, false);
 497                 lyx_view_->updateDialogs();
 498                 lyx_view_->updateStatusBar();
 499         }
 500
 501         // GUI tweaks except with mouse motion with no button pressed.
 502         if (notJustMovingTheMouse) {
 503                 // Slight hack: this is only called currently when we
 504                 // clicked somewhere, so we force through the display
 505                 // of the new status here.
 506                 lyx_view_->clearMessage();
 507
 508                 // Show the cursor immediately after any operation
 509                 startBlinkingCursor();
 510         }
 511 }
 512
 513
 514 void GuiWorkArea::resizeBufferView()
 515 {
 516         // WARNING: Please don't put any code that will trigger a repaint here!
 517         // We are already inside a paint event.
 518         lyx_view_->setBusy(true);
 519         Point p;
 520         int h = 0;
 521         buffer_view_->cursorPosAndHeight(p, h);
 522         bool const cursor_in_view = buffer_view_->cursorInView(p, h);
 523         buffer_view_->resize(viewport()->width(), viewport()->height());
 524         if (cursor_in_view)
 525                 buffer_view_->scrollToCursor();
 526         updateScreen();
 527
 528         // Update scrollbars which might have changed due different
 529         // BufferView dimension. This is especially important when the
 530         // BufferView goes from zero-size to the real-size for the first time,
 531         // as the scrollbar paramters are then set for the first time.
 532         updateScrollbar();
 533
 534         lyx_view_->updateLayoutList();
 535         lyx_view_->setBusy(false);
 536         need_resize_ = false;
 537 }
 538
 539
 540 void GuiWorkArea::showCursor()
 541 {
 542         if (cursor_visible_)
 543                 return;
 544
 545         // RTL or not RTL
 546         bool l_shape = false;
 547         Font const & realfont = buffer_view_->cursor().real_current_font;
 548         BufferParams const & bp = buffer_view_->buffer().params();
 549         bool const samelang = realfont.language() == bp.language;
 550         bool const isrtl = realfont.isVisibleRightToLeft();
 551
 552         if (!samelang || isrtl != bp.language->rightToLeft())
 553                 l_shape = true;
 554
 555         // The ERT language hack needs fixing up
 556         if (realfont.language() == latex_language)
 557                 l_shape = false;
 558
 559         Point p;
 560         int h = 0;
 561         buffer_view_->cursorPosAndHeight(p, h);
 562         // show cursor on screen
 563         Cursor & cur = buffer_view_->cursor();
 564         bool completable = cur.inset().showCompletionCursor()
 565                 && completer_->completionAvailable()
 566                 && !completer_->popupVisible()
 567                 && !completer_->inlineVisible();
 568         if (buffer_view_->cursorInView(p, h)) {
 569                 cursor_visible_ = true;
 570                 showCursor(p.x_, p.y_, h, l_shape, isrtl, completable);
 571         }
 572 }
 573
 574
 575 void GuiWorkArea::hideCursor()
 576 {
 577         if (!cursor_visible_)
 578                 return;
 579
 580         cursor_visible_ = false;
 581         removeCursor();
 582 }
 583
 584
 585 void GuiWorkArea::toggleCursor()
 586 {
 587         if (cursor_visible_)
 588                 hideCursor();
 589         else
 590                 showCursor();
 591 }
 592
 593
 594 void GuiWorkArea::updateScrollbar()
 595 {
 596         ScrollbarParameters const & scroll_ = buffer_view_->scrollbarParameters();
 597         // WARNING: don't touch at the scrollbar value like this:
 598         //   verticalScrollBar()->setValue(scroll_.position);
 599         // because this would cause a recursive signal/slot calling with
 600         // GuiWorkArea::scrollTo
 601         verticalScrollBar()->setRange(scroll_.min, scroll_.max);
 602         verticalScrollBar()->setPageStep(scroll_.page_step);
 603         verticalScrollBar()->setSingleStep(scroll_.single_step);
 604         verticalScrollBar()->setSliderPosition(scroll_.position);
 605 }
 606
 607
 608 void GuiWorkArea::scrollTo(int value)
 609 {
 610         stopBlinkingCursor();
 611         buffer_view_->scrollDocView(value);
 612
 613         if (lyxrc.cursor_follows_scrollbar) {
 614                 buffer_view_->setCursorFromScrollbar();
 615                 lyx_view_->updateLayoutList();
 616         }
 617         // Show the cursor immediately after any operation.
 618         startBlinkingCursor();
 619         QApplication::syncX();
 620 }
 621
 622
 623 bool GuiWorkArea::event(QEvent * e)
 624 {
 625         switch (e->type()) {
 626         case QEvent::ToolTip: {
 627                 QHelpEvent * helpEvent = static_cast<QHelpEvent *>(e);
 628                 if (lyxrc.use_tooltip) {
 629                         QPoint pos = helpEvent->pos();
 630                         if (pos.x() < viewport()->width()) {
 631                                 QString s = toqstr(buffer_view_->toolTip(pos.x(), pos.y()));
 632                                 QToolTip::showText(helpEvent->globalPos(), s);
 633                         }
 634                         else
 635                                 QToolTip::hideText();
 636                 }
 637                 // Don't forget to accept the event!
 638                 e->accept();
 639                 return true;
 640         }
 641
 642         case QEvent::ShortcutOverride: {
 643                 // We catch this event in order to catch the Tab or Shift+Tab key press
 644                 // which are otherwise reserved to focus switching between controls
 645                 // within a dialog.
 646                 QKeyEvent * ke = static_cast<QKeyEvent*>(e);
 647                 if ((ke->key() != Qt::Key_Tab && ke->key() != Qt::Key_Backtab)
 648                         || ke->modifiers() & Qt::ControlModifier)
 649                         return QAbstractScrollArea::event(e);
 650                 keyPressEvent(ke);
 651                 return true;
 652         }
 653
 654         default:
 655                 return QAbstractScrollArea::event(e);
 656         }
 657         return false;
 658 }
 659
 660
 661 void GuiWorkArea::contextMenuEvent(QContextMenuEvent * e)
 662 {
 663         QPoint pos;
 664         if (e->reason() == QContextMenuEvent::Mouse)
 665                 // the position is set on mouse press
 666                 pos = context_target_pos_;
 667         else
 668                 pos = e->pos();
 669         Cursor const & cur = buffer_view_->cursor();
 670         if (e->reason() == QContextMenuEvent::Keyboard && cur.inTexted()) {
 671                 // Do not access the context menu of math right in front of before
 672                 // the cursor. This does not work when the cursor is in text.
 673                 Inset * inset = cur.paragraph().getInset(cur.pos());
 674                 if (inset && inset->asInsetMath())
 675                         --pos.rx();
 676                 else if (cur.pos() > 0) {
 677                         Inset * inset = cur.paragraph().getInset(cur.pos() - 1);
 678                         if (inset)
 679                                 ++pos.rx();
 680                 }
 681         }
 682         docstring name = buffer_view_->contextMenu(pos.x(), pos.y());
 683         if (name.empty()) {
 684                 QAbstractScrollArea::contextMenuEvent(e);
 685                 return;
 686         }
 687         QMenu * menu = guiApp->menus().menu(toqstr(name), *lyx_view_);
 688         if (!menu) {
 689                 QAbstractScrollArea::contextMenuEvent(e);
 690                 return;
 691         }
 692         // Position the menu to the right.
 693         // FIXME: menu position should be different for RTL text.
 694         menu->exec(e->globalPos());
 695         e->accept();
 696 }
 697
 698
 699 void GuiWorkArea::focusInEvent(QFocusEvent * e)
 700 {
 701         /*
 702         LYXERR(Debug::DEBUG, "GuiWorkArea::focusInEvent(): " << this << std::endl);
 703         GuiWorkArea * old_gwa = theGuiApp()->currentView()->currentWorkArea();
 704         if (old_gwa)
 705                 old_gwa->stopBlinkingCursor();
 706         lyx_view_->setCurrentWorkArea(this);
 707         */
 708
 709         if (lyx_view_->currentWorkArea() != this)
 710                 lyx_view_->setCurrentWorkArea(this);
 711
 712         startBlinkingCursor();
 713         QAbstractScrollArea::focusInEvent(e);
 714 }
 715
 716
 717 void GuiWorkArea::focusOutEvent(QFocusEvent * e)
 718 {
 719         LYXERR(Debug::DEBUG, "GuiWorkArea::focusOutEvent(): " << this << std::endl);
 720         stopBlinkingCursor();
 721         QAbstractScrollArea::focusOutEvent(e);
 722 }
 723
 724
 725 void GuiWorkArea::mousePressEvent(QMouseEvent * e)
 726 {
 727         if (dc_event_.active && dc_event_ == *e) {
 728                 dc_event_.active = false;
 729                 FuncRequest cmd(LFUN_MOUSE_TRIPLE, e->x(), e->y(),
 730                         q_button_state(e->button()));
 731                 dispatch(cmd);
 732                 e->accept();
 733                 return;
 734         }
 735
 736         if (e->button() == Qt::RightButton)
 737                 context_target_pos_ = e->pos();
 738
 739         inputContext()->reset();
 740
 741         FuncRequest const cmd(LFUN_MOUSE_PRESS, e->x(), e->y(),
 742                 q_button_state(e->button()));
 743         dispatch(cmd, q_key_state(e->modifiers()));
 744         e->accept();
 745 }
 746
 747
 748 void GuiWorkArea::mouseReleaseEvent(QMouseEvent * e)
 749 {
 750         if (synthetic_mouse_event_.timeout.running())
 751                 synthetic_mouse_event_.timeout.stop();
 752
 753         FuncRequest const cmd(LFUN_MOUSE_RELEASE, e->x(), e->y(),
 754                               q_button_state(e->button()));
 755         dispatch(cmd);
 756         e->accept();
 757 }
 758
 759
 760 void GuiWorkArea::mouseMoveEvent(QMouseEvent * e)
 761 {
 762         // we kill the triple click if we move
 763         doubleClickTimeout();
 764         FuncRequest cmd(LFUN_MOUSE_MOTION, e->x(), e->y(),
 765                 q_motion_state(e->buttons()));
 766
 767         e->accept();
 768
 769         // If we're above or below the work area...
 770         if (e->y() <= 20 || e->y() >= viewport()->height() - 20) {
 771                 // Make sure only a synthetic event can cause a page scroll,
 772                 // so they come at a steady rate:
 773                 if (e->y() <= 20)
 774                         // _Force_ a scroll up:
 775                         cmd.y = -40;
 776                 else
 777                         cmd.y = viewport()->height();
 778                 // Store the event, to be handled when the timeout expires.
 779                 synthetic_mouse_event_.cmd = cmd;
 780
 781                 if (synthetic_mouse_event_.timeout.running())
 782                         // Discard the event. Note that it _may_ be handled
 783                         // when the timeout expires if
 784                         // synthetic_mouse_event_.cmd has not been overwritten.
 785                         // Ie, when the timeout expires, we handle the
 786                         // most recent event but discard all others that
 787                         // occurred after the one used to start the timeout
 788                         // in the first place.
 789                         return;
 790
 791                 synthetic_mouse_event_.restart_timeout = true;
 792                 synthetic_mouse_event_.timeout.start();
 793                 // Fall through to handle this event...
 794
 795         } else if (synthetic_mouse_event_.timeout.running()) {
 796                 // Store the event, to be possibly handled when the timeout
 797                 // expires.
 798                 // Once the timeout has expired, normal control is returned
 799                 // to mouseMoveEvent (restart_timeout = false).
 800                 // This results in a much smoother 'feel' when moving the
 801                 // mouse back into the work area.
 802                 synthetic_mouse_event_.cmd = cmd;
 803                 synthetic_mouse_event_.restart_timeout = false;
 804                 return;
 805         }
 806
 807         // Has anything changed on-screen since the last QMouseEvent
 808         // was received?
 809         if (e->x() == synthetic_mouse_event_.x_old
 810                 && e->y() == synthetic_mouse_event_.y_old
 811                 && synthetic_mouse_event_.min_scrollbar_old == verticalScrollBar()->minimum()
 812                 && synthetic_mouse_event_.max_scrollbar_old == verticalScrollBar()->maximum()) {
 813                 // Nothing changed on-screen since the last QMouseEvent.
 814                 return;
 815         }
 816
 817         // Yes something has changed. Store the params used to check this.
 818         synthetic_mouse_event_.x_old = e->x();
 819         synthetic_mouse_event_.y_old = e->y();
 820         synthetic_mouse_event_.min_scrollbar_old = verticalScrollBar()->minimum();
 821         synthetic_mouse_event_.max_scrollbar_old = verticalScrollBar()->maximum();
 822
 823         // ... and dispatch the event to the LyX core.
 824         dispatch(cmd);
 825 }
 826
 827
 828 void GuiWorkArea::wheelEvent(QWheelEvent * ev)
 829 {
 830         // Wheel rotation by one notch results in a delta() of 120 (see
 831         // documentation of QWheelEvent)
 832         int const delta = ev->delta() / 120;
 833         if (ev->modifiers() & Qt::ControlModifier) {
 834                 docstring arg = convert<docstring>(5 * delta);
 835                 lyx::dispatch(FuncRequest(LFUN_BUFFER_ZOOM_IN, arg));
 836                 return;
 837         }
 838
 839         // Take into account the desktop wide settings.
 840         int const lines = qApp->wheelScrollLines();
 841         int const page_step = verticalScrollBar()->pageStep();
 842         // Test if the wheel mouse is set to one screen at a time.
 843         int scroll_value = lines > page_step
 844                 ? page_step : lines * verticalScrollBar()->singleStep();
 845
 846         // Take into account the rotation.
 847         scroll_value *= delta;
 848
 849         // Take into account user preference.
 850         scroll_value = int(scroll_value * lyxrc.mouse_wheel_speed);
 851         LYXERR(Debug::SCROLLING, "wheelScrollLines = " << lines
 852                         << " delta = " << delta << " scroll_value = " << scroll_value
 853                         << " page_step = " << page_step);
 854         // Now scroll.
 855         verticalScrollBar()->setValue(verticalScrollBar()->value() - scroll_value);
 856
 857         ev->accept();
 858 }
 859
 860
 861 void GuiWorkArea::generateSyntheticMouseEvent()
 862 {
 863         // Set things off to generate the _next_ 'pseudo' event.
 864         if (synthetic_mouse_event_.restart_timeout)
 865                 synthetic_mouse_event_.timeout.start();
 866
 867         // Has anything changed on-screen since the last timeout signal
 868         // was received?
 869         int const min_scrollbar = verticalScrollBar()->minimum();
 870         int const max_scrollbar = verticalScrollBar()->maximum();
 871         if (min_scrollbar == synthetic_mouse_event_.min_scrollbar_old
 872                 && max_scrollbar == synthetic_mouse_event_.max_scrollbar_old) {
 873                 return;
 874         }
 875         // Yes it has. Store the params used to check this.
 876         synthetic_mouse_event_.min_scrollbar_old = min_scrollbar;
 877         synthetic_mouse_event_.max_scrollbar_old = max_scrollbar;
 878         // ... and dispatch the event to the LyX core.
 879         dispatch(synthetic_mouse_event_.cmd);
 880 }
 881
 882
 883 void GuiWorkArea::keyPressEvent(QKeyEvent * ev)
 884 {
 885         // Do not process here some keys if dialog_mode_ is set
 886         if (dialog_mode_
 887                 && (ev->modifiers() == Qt::NoModifier
 888                     || ev->modifiers() == Qt::ShiftModifier)
 889                 && (ev->key() == Qt::Key_Escape
 890                     || ev->key() == Qt::Key_Enter
 891                     || ev->key() == Qt::Key_Return)
 892             ) {
 893                 ev->ignore();
 894                 return;
 895         }
 896
 897         // intercept some keys if completion popup is visible
 898         if (completer_->popupVisible()) {
 899                 switch (ev->key()) {
 900                 case Qt::Key_Enter:
 901                 case Qt::Key_Return:
 902                         completer_->activate();
 903                         ev->accept();
 904                         return;
 905                 }
 906         }
 907
 908         // do nothing if there are other events
 909         // (the auto repeated events come too fast)
 910         // \todo FIXME: remove hard coded Qt keys, process the key binding
 911 #ifdef Q_WS_X11
 912         if (XEventsQueued(QX11Info::display(), 0) > 1 && ev->isAutoRepeat()
 913                         && (Qt::Key_PageDown || Qt::Key_PageUp)) {
 914                 LYXERR(Debug::KEY, "system is busy: scroll key event ignored");
 915                 ev->ignore();
 916                 return;
 917         }
 918 #endif
 919
 920         LYXERR(Debug::KEY, " count: " << ev->count() << " text: " << ev->text()
 921                 << " isAutoRepeat: " << ev->isAutoRepeat() << " key: " << ev->key());
 922
 923         KeySymbol sym;
 924         setKeySymbol(&sym, ev);
 925         if (sym.isOK()) {
 926                 processKeySym(sym, q_key_state(ev->modifiers()));
 927                 ev->accept();
 928         } else {
 929                 ev->ignore();
 930         }
 931 }
 932
 933
 934 void GuiWorkArea::doubleClickTimeout()
 935 {
 936         dc_event_.active = false;
 937 }
 938
 939
 940 void GuiWorkArea::mouseDoubleClickEvent(QMouseEvent * ev)
 941 {
 942         dc_event_ = DoubleClick(ev);
 943         QTimer::singleShot(QApplication::doubleClickInterval(), this,
 944                            SLOT(doubleClickTimeout()));
 945         FuncRequest cmd(LFUN_MOUSE_DOUBLE,
 946                         ev->x(), ev->y(),
 947                         q_button_state(ev->button()));
 948         dispatch(cmd);
 949         ev->accept();
 950 }
 951
 952
 953 void GuiWorkArea::resizeEvent(QResizeEvent * ev)
 954 {
 955         QAbstractScrollArea::resizeEvent(ev);
 956         need_resize_ = true;
 957         ev->accept();
 958 }
 959
 960
 961 void GuiWorkArea::update(int x, int y, int w, int h)
 962 {
 963         viewport()->repaint(x, y, w, h);
 964 }
 965
 966
 967 void GuiWorkArea::paintEvent(QPaintEvent * ev)
 968 {
 969         QRect const rc = ev->rect();
 970         // LYXERR(Debug::PAINTING, "paintEvent begin: x: " << rc.x()
 971         //      << " y: " << rc.y() << " w: " << rc.width() << " h: " << rc.height());
 972
 973         if (need_resize_) {
 974                 screen_ = QPixmap(viewport()->width(), viewport()->height());
 975                 resizeBufferView();
 976                 if (cursor_visible_) {
 977                         hideCursor();
 978                         showCursor();
 979                 }
 980         }
 981
 982         QPainter pain(viewport());
 983         pain.drawPixmap(rc, screen_, rc);
 984         cursor_->draw(pain);
 985         ev->accept();
 986 }
 987
 988
 989 void GuiWorkArea::updateScreen()
 990 {
 991         GuiPainter pain(&screen_);
 992         buffer_view_->draw(pain);
 993 }
 994
 995
 996 void GuiWorkArea::showCursor(int x, int y, int h,
 997         bool l_shape, bool rtl, bool completable)
 998 {
 999         if (schedule_redraw_) {
1000                 // This happens when a graphic conversion is finished. As we don't know
1001                 // the size of the new graphics, it's better the update everything.
1002                 // We can't use redraw() here because this would trigger a infinite
1003                 // recursive loop with showCursor().
1004                 buffer_view_->resize(viewport()->width(), viewport()->height());
1005                 updateScreen();
1006                 updateScrollbar();
1007                 viewport()->update(QRect(0, 0, viewport()->width(), viewport()->height()));
1008                 schedule_redraw_ = false;
1009                 // Show the cursor immediately after the update.
1010                 hideCursor();
1011                 toggleCursor();
1012                 return;
1013         }
1014
1015         cursor_->update(x, y, h, l_shape, rtl, completable);
1016         cursor_->show();
1017         viewport()->update(cursor_->rect());
1018 }
1019
1020
1021 void GuiWorkArea::removeCursor()
1022 {
1023         cursor_->hide();
1024         //if (!qApp->focusWidget())
1025                 viewport()->update(cursor_->rect());
1026 }
1027
1028
1029 void GuiWorkArea::inputMethodEvent(QInputMethodEvent * e)
1030 {
1031         QString const & commit_string = e->commitString();
1032         docstring const & preedit_string
1033                 = qstring_to_ucs4(e->preeditString());
1034
1035         if (!commit_string.isEmpty()) {
1036
1037                 LYXERR(Debug::KEY, "preeditString: " << e->preeditString()
1038                         << " commitString: " << e->commitString());
1039
1040                 int key = 0;
1041
1042                 // FIXME Iwami 04/01/07: we should take care also of UTF16 surrogates here.
1043                 for (int i = 0; i != commit_string.size(); ++i) {
1044                         QKeyEvent ev(QEvent::KeyPress, key, Qt::NoModifier, commit_string[i]);
1045                         keyPressEvent(&ev);
1046                 }
1047         }
1048
1049         // Hide the cursor during the kana-kanji transformation.
1050         if (preedit_string.empty())
1051                 startBlinkingCursor();
1052         else
1053                 stopBlinkingCursor();
1054
1055         // last_width : for checking if last preedit string was/wasn't empty.
1056         static bool last_width = false;
1057         if (!last_width && preedit_string.empty()) {
1058                 // if last_width is last length of preedit string.
1059                 e->accept();
1060                 return;
1061         }
1062
1063         GuiPainter pain(&screen_);
1064         buffer_view_->updateMetrics();
1065         buffer_view_->draw(pain);
1066         FontInfo font = buffer_view_->cursor().getFont().fontInfo();
1067         FontMetrics const & fm = theFontMetrics(font);
1068         int height = fm.maxHeight();
1069         int cur_x = cursor_->rect().left();
1070         int cur_y = cursor_->rect().bottom();
1071
1072         // redraw area of preedit string.
1073         update(0, cur_y - height, viewport()->width(),
1074                 (height + 1) * preedit_lines_);
1075
1076         if (preedit_string.empty()) {
1077                 last_width = false;
1078                 preedit_lines_ = 1;
1079                 e->accept();
1080                 return;
1081         }
1082         last_width = true;
1083
1084         // att : stores an IM attribute.
1085         QList<QInputMethodEvent::Attribute> const & att = e->attributes();
1086
1087         // get attributes of input method cursor.
1088         // cursor_pos : cursor position in preedit string.
1089         size_t cursor_pos = 0;
1090         bool cursor_is_visible = false;
1091         for (int i = 0; i != att.size(); ++i) {
1092                 if (att.at(i).type == QInputMethodEvent::Cursor) {
1093                         cursor_pos = att.at(i).start;
1094                         cursor_is_visible = att.at(i).length != 0;
1095                         break;
1096                 }
1097         }
1098
1099         size_t preedit_length = preedit_string.length();
1100
1101         // get position of selection in input method.
1102         // FIXME: isn't there a way to do this simplier?
1103         // rStart : cursor position in selected string in IM.
1104         size_t rStart = 0;
1105         // rLength : selected string length in IM.
1106         size_t rLength = 0;
1107         if (cursor_pos < preedit_length) {
1108                 for (int i = 0; i != att.size(); ++i) {
1109                         if (att.at(i).type == QInputMethodEvent::TextFormat) {
1110                                 if (att.at(i).start <= int(cursor_pos)
1111                                         && int(cursor_pos) < att.at(i).start + att.at(i).length) {
1112                                                 rStart = att.at(i).start;
1113                                                 rLength = att.at(i).length;
1114                                                 if (!cursor_is_visible)
1115                                                         cursor_pos += rLength;
1116                                                 break;
1117                                 }
1118                         }
1119                 }
1120         }
1121         else {
1122                 rStart = cursor_pos;
1123                 rLength = 0;
1124         }
1125
1126         int const right_margin = buffer_view_->rightMargin();
1127         Painter::preedit_style ps;
1128         // Most often there would be only one line:
1129         preedit_lines_ = 1;
1130         for (size_t pos = 0; pos != preedit_length; ++pos) {
1131                 char_type const typed_char = preedit_string[pos];
1132                 // reset preedit string style
1133                 ps = Painter::preedit_default;
1134
1135                 // if we reached the right extremity of the screen, go to next line.
1136                 if (cur_x + fm.width(typed_char) > viewport()->width() - right_margin) {
1137                         cur_x = right_margin;
1138                         cur_y += height + 1;
1139                         ++preedit_lines_;
1140                 }
1141                 // preedit strings are displayed with dashed underline
1142                 // and partial strings are displayed white on black indicating
1143                 // that we are in selecting mode in the input method.
1144                 // FIXME: rLength == preedit_length is not a changing condition
1145                 // FIXME: should be put out of the loop.
1146                 if (pos >= rStart
1147                         && pos < rStart + rLength
1148                         && !(cursor_pos < rLength && rLength == preedit_length))
1149                         ps = Painter::preedit_selecting;
1150
1151                 if (pos == cursor_pos
1152                         && (cursor_pos < rLength && rLength == preedit_length))
1153                         ps = Painter::preedit_cursor;
1154
1155                 // draw one character and update cur_x.
1156                 cur_x += pain.preeditText(cur_x, cur_y, typed_char, font, ps);
1157         }
1158
1159         // update the preedit string screen area.
1160         update(0, cur_y - preedit_lines_*height, viewport()->width(),
1161                 (height + 1) * preedit_lines_);
1162
1163         // Don't forget to accept the event!
1164         e->accept();
1165 }
1166
1167
1168 QVariant GuiWorkArea::inputMethodQuery(Qt::InputMethodQuery query) const
1169 {
1170         QRect cur_r(0, 0, 0, 0);
1171         switch (query) {
1172                 // this is the CJK-specific composition window position and
1173                 // the context menu position when the menu key is pressed.
1174                 case Qt::ImMicroFocus:
1175                         cur_r = cursor_->rect();
1176                         if (preedit_lines_ != 1)
1177                                 cur_r.moveLeft(10);
1178                         cur_r.moveBottom(cur_r.bottom()
1179                                 + cur_r.height() * (preedit_lines_ - 1));
1180                         // return lower right of cursor in LyX.
1181                         return cur_r;
1182                 default:
1183                         return QWidget::inputMethodQuery(query);
1184         }
1185 }
1186
1187
1188 void GuiWorkArea::updateWindowTitle()
1189 {
1190         docstring maximize_title;
1191         docstring minimize_title;
1192
1193         Buffer & buf = buffer_view_->buffer();
1194         FileName const fileName = buf.fileName();
1195         if (!fileName.empty()) {
1196                 maximize_title = fileName.displayName(30);
1197                 minimize_title = from_utf8(fileName.onlyFileName());
1198                 if (buf.lyxvc().inUse()) {
1199                         if (buf.lyxvc().locker().empty())
1200                                 maximize_title +=  _(" (version control)");
1201                         else
1202                                 maximize_title +=  _(" (version control, locking)");
1203                 }
1204                 if (!buf.isClean()) {
1205                         maximize_title += _(" (changed)");
1206                         minimize_title += char_type('*');
1207                 }
1208                 if (buf.isReadonly())
1209                         maximize_title += _(" (read only)");
1210         }
1211
1212         QString title = windowTitle();
1213         QString new_title = toqstr(maximize_title);
1214         if (title == new_title)
1215                 return;
1216
1217         QWidget::setWindowTitle(new_title);
1218         QWidget::setWindowIconText(toqstr(minimize_title));
1219         titleChanged(this);
1220 }
1221
1222
1223 void GuiWorkArea::setReadOnly(bool)
1224 {
1225         updateWindowTitle();
1226         if (this == lyx_view_->currentWorkArea())
1227                 lyx_view_->updateDialogs();
1228 }
1229
1230
1231 bool GuiWorkArea::isFullScreen()
1232 {
1233         return lyx_view_ && lyx_view_->isFullScreen();
1234 }
1235
1236
1237 ////////////////////////////////////////////////////////////////////
1238 //
1239 // EmbeddedWorkArea
1240 //
1241 ////////////////////////////////////////////////////////////////////
1242
1243
1244 EmbeddedWorkArea::EmbeddedWorkArea(QWidget * w): GuiWorkArea(w)
1245 {
1246         buffer_ = theBufferList().newBuffer(
1247                 support::FileName::tempName().absFilename() + "_embedded.internal");
1248         buffer_->setUnnamed(true);
1249         buffer_->setFullyLoaded(true);
1250         setBuffer(*buffer_);
1251         setDialogMode(true);
1252 }
1253
1254
1255 EmbeddedWorkArea::~EmbeddedWorkArea()
1256 {
1257         // No need to destroy buffer and bufferview here, because it is done
1258         // in theBuffeerList() destruction loop at application exit
1259 }
1260
1261
1262 void EmbeddedWorkArea::closeEvent(QCloseEvent * ev)
1263 {
1264         disable();
1265         GuiWorkArea::closeEvent(ev);
1266 }
1267
1268
1269 void EmbeddedWorkArea::hideEvent(QHideEvent * ev)
1270 {
1271         disable();
1272         GuiWorkArea::hideEvent(ev);
1273 }
1274
1275
1276 void EmbeddedWorkArea::disable()
1277 {
1278         stopBlinkingCursor();
1279         if (view().currentWorkArea() != this)
1280                 return;
1281         // No problem if currentMainWorkArea() is 0 (setCurrentWorkArea()
1282         // tolerates it and shows the background logo), what happens if
1283         // an EmbeddedWorkArea is closed after closing all document WAs
1284         view().setCurrentWorkArea(view().currentMainWorkArea());
1285 }
1286
1287 ////////////////////////////////////////////////////////////////////
1288 //
1289 // TabWorkArea
1290 //
1291 ////////////////////////////////////////////////////////////////////
1292
1293 #ifdef Q_WS_MACX
1294 class NoTabFrameMacStyle : public QMacStyle {
1295 public:
1296         ///
1297         QRect subElementRect(SubElement element, const QStyleOption * option,
1298                              const QWidget * widget = 0) const
1299         {
1300                 QRect rect = QMacStyle::subElementRect(element, option, widget);
1301                 bool noBar = static_cast<QTabWidget const *>(widget)->count() <= 1;
1302
1303                 // The Qt Mac style puts the contents into a 3 pixel wide box
1304                 // which looks very ugly and not like other Mac applications.
1305                 // Hence we remove this here, and moreover the 16 pixel round
1306                 // frame above if the tab bar is hidden.
1307                 if (element == QStyle::SE_TabWidgetTabContents) {
1308                         rect.adjust(- rect.left(), 0, rect.left(), 0);
1309                         if (noBar)
1310                                 rect.setTop(0);
1311                 }
1312
1313                 return rect;
1314         }
1315 };
1316
1317 NoTabFrameMacStyle noTabFrameMacStyle;
1318 #endif
1319
1320
1321 TabWorkArea::TabWorkArea(QWidget * parent)
1322         : QTabWidget(parent), clicked_tab_(-1)
1323 {
1324 #ifdef Q_WS_MACX
1325         setStyle(&noTabFrameMacStyle);
1326 #endif
1327 #if QT_VERSION < 0x040500
1328         lyxrc.single_close_tab_button = true;
1329 #endif
1330
1331         QPalette pal = palette();
1332         pal.setColor(QPalette::Active, QPalette::Button,
1333                 pal.color(QPalette::Active, QPalette::Window));
1334         pal.setColor(QPalette::Disabled, QPalette::Button,
1335                 pal.color(QPalette::Disabled, QPalette::Window));
1336         pal.setColor(QPalette::Inactive, QPalette::Button,
1337                 pal.color(QPalette::Inactive, QPalette::Window));
1338
1339         QObject::connect(this, SIGNAL(currentChanged(int)),
1340                 this, SLOT(on_currentTabChanged(int)));
1341
1342         closeBufferButton = new QToolButton(this);
1343         closeBufferButton->setPalette(pal);
1344         // FIXME: rename the icon to closebuffer.png
1345         closeBufferButton->setIcon(QIcon(getPixmap("images/", "closetab", "png")));
1346         closeBufferButton->setText("Close File");
1347         closeBufferButton->setAutoRaise(true);
1348         closeBufferButton->setCursor(Qt::ArrowCursor);
1349         closeBufferButton->setToolTip(qt_("Close File"));
1350         closeBufferButton->setEnabled(true);
1351         QObject::connect(closeBufferButton, SIGNAL(clicked()),
1352                 this, SLOT(closeCurrentBuffer()));
1353         setCornerWidget(closeBufferButton, Qt::TopRightCorner);
1354
1355         // setup drag'n'drop
1356         QTabBar* tb = new DragTabBar;
1357         connect(tb, SIGNAL(tabMoveRequested(int, int)),
1358                 this, SLOT(moveTab(int, int)));
1359         tb->setElideMode(Qt::ElideNone);
1360         setTabBar(tb);
1361
1362         // make us responsible for the context menu of the tabbar
1363         tb->setContextMenuPolicy(Qt::CustomContextMenu);
1364         connect(tb, SIGNAL(customContextMenuRequested(const QPoint &)),
1365                 this, SLOT(showContextMenu(const QPoint &)));
1366 #if QT_VERSION >= 0x040500
1367         connect(tb, SIGNAL(tabCloseRequested(int)),
1368                 this, SLOT(closeTab(int)));
1369 #endif
1370
1371         setUsesScrollButtons(true);
1372 }
1373
1374
1375 void TabWorkArea::setFullScreen(bool full_screen)
1376 {
1377         for (int i = 0; i != count(); ++i) {
1378                 if (GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i)))
1379                         wa->setFullScreen(full_screen);
1380         }
1381
1382         if (lyxrc.full_screen_tabbar)
1383                 showBar(!full_screen && count() > 1);
1384 }
1385
1386
1387 void TabWorkArea::showBar(bool show)
1388 {
1389         tabBar()->setEnabled(show);
1390         tabBar()->setVisible(show);
1391         closeBufferButton->setVisible(show && lyxrc.single_close_tab_button);
1392 #if QT_VERSION >= 0x040500
1393         setTabsClosable(!lyxrc.single_close_tab_button);
1394 #endif
1395 }
1396
1397
1398 GuiWorkArea * TabWorkArea::currentWorkArea()
1399 {
1400         if (count() == 0)
1401                 return 0;
1402
1403         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(currentWidget());
1404         LASSERT(wa, /**/);
1405         return wa;
1406 }
1407
1408
1409 GuiWorkArea * TabWorkArea::workArea(Buffer & buffer)
1410 {
1411         for (int i = 0; i != count(); ++i) {
1412                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i));
1413                 LASSERT(wa, return 0);
1414                 if (&wa->bufferView().buffer() == &buffer)
1415                         return wa;
1416         }
1417         return 0;
1418 }
1419
1420
1421 void TabWorkArea::closeAll()
1422 {
1423         while (count()) {
1424                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(0));
1425                 LASSERT(wa, /**/);
1426                 removeTab(0);
1427                 delete wa;
1428         }
1429 }
1430
1431
1432 bool TabWorkArea::setCurrentWorkArea(GuiWorkArea * work_area)
1433 {
1434         LASSERT(work_area, /**/);
1435         int index = indexOf(work_area);
1436         if (index == -1)
1437                 return false;
1438
1439         if (index == currentIndex())
1440                 // Make sure the work area is up to date.
1441                 on_currentTabChanged(index);
1442         else
1443                 // Switch to the work area.
1444                 setCurrentIndex(index);
1445         work_area->setFocus();
1446
1447         return true;
1448 }
1449
1450
1451 GuiWorkArea * TabWorkArea::addWorkArea(Buffer & buffer, GuiView & view)
1452 {
1453         GuiWorkArea * wa = new GuiWorkArea(buffer, view);
1454         wa->setUpdatesEnabled(false);
1455         // Hide tabbar if there's no tab (avoid a resize and a flashing tabbar
1456         // when hiding it again below).
1457         if (!(currentWorkArea() && currentWorkArea()->isFullScreen()))
1458                 showBar(count() > 0);
1459         addTab(wa, wa->windowTitle());
1460         QObject::connect(wa, SIGNAL(titleChanged(GuiWorkArea *)),
1461                 this, SLOT(updateTabTexts()));
1462         if (currentWorkArea() && currentWorkArea()->isFullScreen())
1463                 setFullScreen(true);
1464         else
1465                 // Hide tabbar if there's only one tab.
1466                 showBar(count() > 1);
1467
1468         updateTabTexts();
1469
1470         return wa;
1471 }
1472
1473
1474 bool TabWorkArea::removeWorkArea(GuiWorkArea * work_area)
1475 {
1476         LASSERT(work_area, return false);
1477         int index = indexOf(work_area);
1478         if (index == -1)
1479                 return false;
1480
1481         work_area->setUpdatesEnabled(false);
1482         removeTab(index);
1483         delete work_area;
1484
1485         if (count()) {
1486                 // make sure the next work area is enabled.
1487                 currentWidget()->setUpdatesEnabled(true);
1488                 if (currentWorkArea() && currentWorkArea()->isFullScreen())
1489                         setFullScreen(true);
1490                 else
1491                         // Show tabbar only if there's more than one tab.
1492                         showBar(count() > 1);
1493         } else
1494                 lastWorkAreaRemoved();
1495
1496         updateTabTexts();
1497
1498         return true;
1499 }
1500
1501
1502 void TabWorkArea::on_currentTabChanged(int i)
1503 {
1504         // returns e.g. on application destruction
1505         if (i == -1)
1506                 return;
1507         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i));
1508         LASSERT(wa, return);
1509         wa->setUpdatesEnabled(true);
1510         wa->redraw(true);
1511         wa->setFocus();
1512         ///
1513         currentWorkAreaChanged(wa);
1514
1515         LYXERR(Debug::GUI, "currentTabChanged " << i
1516                 << "File" << wa->bufferView().buffer().absFileName());
1517 }
1518
1519
1520 void TabWorkArea::closeCurrentBuffer()
1521 {
1522         GuiWorkArea * wa;
1523         if (clicked_tab_ == -1)
1524                 wa = currentWorkArea();
1525         else {
1526                 wa = dynamic_cast<GuiWorkArea *>(widget(clicked_tab_));
1527                 LASSERT(wa, /**/);
1528         }
1529         wa->view().closeWorkArea(wa);
1530 }
1531
1532
1533 void TabWorkArea::hideCurrentTab()
1534 {
1535         GuiWorkArea * wa;
1536         if (clicked_tab_ == -1)
1537                 wa = currentWorkArea();
1538         else {
1539                 wa = dynamic_cast<GuiWorkArea *>(widget(clicked_tab_));
1540                 LASSERT(wa, /**/);
1541         }
1542         wa->view().hideWorkArea(wa);
1543 }
1544
1545
1546 void TabWorkArea::closeTab(int index)
1547 {
1548         on_currentTabChanged(index);
1549         GuiWorkArea * wa;
1550         if (index == -1)
1551                 wa = currentWorkArea();
1552         else {
1553                 wa = dynamic_cast<GuiWorkArea *>(widget(index));
1554                 LASSERT(wa, /**/);
1555         }
1556         wa->view().closeWorkArea(wa);
1557 }
1558
1559
1560 ///
1561 class DisplayPath {
1562 public:
1563         /// make vector happy
1564         DisplayPath() {}
1565         ///
1566         DisplayPath(int tab, FileName const & filename)
1567                 : tab_(tab)
1568         {
1569                 filename_ = (filename.extension() == "lyx") ?
1570                         toqstr(filename.onlyFileNameWithoutExt())
1571                         : toqstr(filename.onlyFileName());
1572                 postfix_ = toqstr(filename.absoluteFilePath()).
1573                         split("/", QString::SkipEmptyParts);
1574                 postfix_.pop_back();
1575                 abs_ = toqstr(filename.absoluteFilePath());
1576                 dottedPrefix_ = false;
1577         }
1578
1579         /// Absolute path for debugging.
1580         QString abs() const
1581         {
1582                 return abs_;
1583         }
1584         /// Add the first segment from the postfix or three dots to the prefix.
1585         /// Merge multiple dot tripples. In fact dots are added lazily, i.e. only
1586         /// when really needed.
1587         void shiftPathSegment(bool dotted)
1588         {
1589                 if (postfix_.count() <= 0)
1590                         return;
1591
1592                 if (!dotted) {
1593                         if (dottedPrefix_ && !prefix_.isEmpty())
1594                                 prefix_ += ".../";
1595                         prefix_ += postfix_.front() + "/";
1596                 }
1597                 dottedPrefix_ = dotted && !prefix_.isEmpty();
1598                 postfix_.pop_front();
1599         }
1600         ///
1601         QString displayString() const
1602         {
1603                 if (prefix_.isEmpty())
1604                         return filename_;
1605
1606                 bool dots = dottedPrefix_ || !postfix_.isEmpty();
1607                 return prefix_ + (dots ? ".../" : "") + filename_;
1608         }
1609         ///
1610         QString forecastPathString() const
1611         {
1612                 if (postfix_.count() == 0)
1613                         return displayString();
1614
1615                 return prefix_
1616                         + (dottedPrefix_ ? ".../" : "")
1617                         + postfix_.front() + "/";
1618         }
1619         ///
1620         bool final() const { return postfix_.empty(); }
1621         ///
1622         int tab() const { return tab_; }
1623
1624 private:
1625         ///
1626         QString prefix_;
1627         ///
1628         QStringList postfix_;
1629         ///
1630         QString filename_;
1631         ///
1632         QString abs_;
1633         ///
1634         int tab_;
1635         ///
1636         bool dottedPrefix_;
1637 };
1638
1639
1640 ///
1641 bool operator<(DisplayPath const & a, DisplayPath const & b)
1642 {
1643         return a.displayString() < b.displayString();
1644 }
1645
1646 ///
1647 bool operator==(DisplayPath const & a, DisplayPath const & b)
1648 {
1649         return a.displayString() == b.displayString();
1650 }
1651
1652
1653 void TabWorkArea::updateTabTexts()
1654 {
1655         size_t n = count();
1656         if (n == 0)
1657                 return;
1658         std::list<DisplayPath> paths;
1659         typedef std::list<DisplayPath>::iterator It;
1660
1661         // collect full names first: path into postfix, empty prefix and
1662         // filename without extension
1663         for (size_t i = 0; i < n; ++i) {
1664                 GuiWorkArea * i_wa = dynamic_cast<GuiWorkArea *>(widget(i));
1665                 FileName const fn = i_wa->bufferView().buffer().fileName();
1666                 paths.push_back(DisplayPath(i, fn));
1667         }
1668
1669         // go through path segments and see if it helps to make the path more unique
1670         bool somethingChanged = true;
1671         bool allFinal = false;
1672         while (somethingChanged && !allFinal) {
1673                 // adding path segments changes order
1674                 paths.sort();
1675
1676                 LYXERR(Debug::GUI, "updateTabTexts() iteration start");
1677                 somethingChanged = false;
1678                 allFinal = true;
1679
1680                 // find segments which are not unique (i.e. non-atomic)
1681                 It it = paths.begin();
1682                 It segStart = it;
1683                 QString segString = it->displayString();
1684                 for (; it != paths.end(); ++it) {
1685                         // look to the next item
1686                         It next = it;
1687                         ++next;
1688
1689                         // final?
1690                         allFinal = allFinal && it->final();
1691
1692                         LYXERR(Debug::GUI, "it = " << it->abs()
1693                                << " => " << it->displayString());
1694
1695                         // still the same segment?
1696                         QString nextString;
1697                         if ((next != paths.end()
1698                              && (nextString = next->displayString()) == segString))
1699                                 continue;
1700                         LYXERR(Debug::GUI, "segment ended");
1701
1702                         // only a trivial one with one element?
1703                         if (it == segStart) {
1704                                 // start new segment
1705                                 segStart = next;
1706                                 segString = nextString;
1707                                 continue;
1708                         }
1709
1710                         // we found a non-atomic segment segStart <= sit <= it < next.
1711                         // Shift path segments and hope for the best
1712                         // that it makes the path more unique.
1713                         somethingChanged = true;
1714                         It sit = segStart;
1715                         QString dspString = sit->forecastPathString();
1716                         LYXERR(Debug::GUI, "first forecast found for "
1717                                << sit->abs() << " => " << dspString);
1718                         ++sit;
1719                         bool moreUnique = false;
1720                         for (; sit != next; ++sit) {
1721                                 if (sit->forecastPathString() != dspString) {
1722                                         LYXERR(Debug::GUI, "different forecast found for "
1723                                                 << sit->abs() << " => " << sit->forecastPathString());
1724                                         moreUnique = true;
1725                                         break;
1726                                 }
1727                                 LYXERR(Debug::GUI, "same forecast found for "
1728                                         << sit->abs() << " => " << dspString);
1729                         }
1730
1731                         // if the path segment helped, add it. Otherwise add dots
1732                         bool dots = !moreUnique;
1733                         LYXERR(Debug::GUI, "using dots = " << dots);
1734                         for (sit = segStart; sit != next; ++sit) {
1735                                 sit->shiftPathSegment(dots);
1736                                 LYXERR(Debug::GUI, "shifting "
1737                                         << sit->abs() << " => " << sit->displayString());
1738                         }
1739
1740                         // start new segment
1741                         segStart = next;
1742                         segString = nextString;
1743                 }
1744         }
1745
1746         // set new tab titles
1747         for (It it = paths.begin(); it != paths.end(); ++it) {
1748                 GuiWorkArea * i_wa = dynamic_cast<GuiWorkArea *>(widget(it->tab()));
1749                 Buffer & buf = i_wa->bufferView().buffer();
1750                 if (!buf.fileName().empty() && !buf.isClean())
1751                         setTabText(it->tab(), it->displayString() + "*");
1752                 else
1753                         setTabText(it->tab(), it->displayString());
1754         }
1755 }
1756
1757
1758 void TabWorkArea::showContextMenu(const QPoint & pos)
1759 {
1760         // which tab?
1761         clicked_tab_ = static_cast<DragTabBar *>(tabBar())->tabAt(pos);
1762         if (clicked_tab_ == -1)
1763                 return;
1764
1765         // show tab popup
1766         QMenu popup;
1767         popup.addAction(QIcon(getPixmap("images/", "hidetab", "png")),
1768                 qt_("Hide tab"), this, SLOT(hideCurrentTab()));
1769         popup.addAction(QIcon(getPixmap("images/", "closetab", "png")),
1770                 qt_("Close tab"), this, SLOT(closeCurrentBuffer()));
1771         popup.exec(tabBar()->mapToGlobal(pos));
1772
1773         clicked_tab_ = -1;
1774 }
1775
1776
1777 void TabWorkArea::moveTab(int fromIndex, int toIndex)
1778 {
1779         QWidget * w = widget(fromIndex);
1780         QIcon icon = tabIcon(fromIndex);
1781         QString text = tabText(fromIndex);
1782
1783         setCurrentIndex(fromIndex);
1784         removeTab(fromIndex);
1785         insertTab(toIndex, w, icon, text);
1786         setCurrentIndex(toIndex);
1787 }
1788
1789
1790 DragTabBar::DragTabBar(QWidget* parent)
1791         : QTabBar(parent)
1792 {
1793         setAcceptDrops(true);
1794 #if QT_VERSION >= 0x040500
1795         setTabsClosable(!lyxrc.single_close_tab_button);
1796 #endif
1797 }
1798
1799
1800 #if QT_VERSION < 0x040300
1801 int DragTabBar::tabAt(QPoint const & position) const
1802 {
1803         const int max = count();
1804         for (int i = 0; i < max; ++i) {
1805                 if (tabRect(i).contains(position))
1806                         return i;
1807         }
1808         return -1;
1809 }
1810 #endif
1811
1812
1813 void DragTabBar::mousePressEvent(QMouseEvent * event)
1814 {
1815         if (event->button() == Qt::LeftButton)
1816                 dragStartPos_ = event->pos();
1817         QTabBar::mousePressEvent(event);
1818 }
1819
1820
1821 void DragTabBar::mouseMoveEvent(QMouseEvent * event)
1822 {
1823         // If the left button isn't pressed anymore then return
1824         if (!(event->buttons() & Qt::LeftButton))
1825                 return;
1826
1827         // If the distance is too small then return
1828         if ((event->pos() - dragStartPos_).manhattanLength()
1829             < QApplication::startDragDistance())
1830                 return;
1831
1832         // did we hit something after all?
1833         int tab = tabAt(dragStartPos_);
1834         if (tab == -1)
1835                 return;
1836
1837         // simulate button release to remove highlight from button
1838         int i = currentIndex();
1839         QMouseEvent me(QEvent::MouseButtonRelease, dragStartPos_,
1840                 event->button(), event->buttons(), 0);
1841         QTabBar::mouseReleaseEvent(&me);
1842         setCurrentIndex(i);
1843
1844         // initiate Drag
1845         QDrag * drag = new QDrag(this);
1846         QMimeData * mimeData = new QMimeData;
1847         // a crude way to distinguish tab-reodering drops from other ones
1848         mimeData->setData("action", "tab-reordering") ;
1849         drag->setMimeData(mimeData);
1850
1851 #if QT_VERSION >= 0x040300
1852         // get tab pixmap as cursor
1853         QRect r = tabRect(tab);
1854         QPixmap pixmap(r.size());
1855         render(&pixmap, - r.topLeft());
1856         drag->setPixmap(pixmap);
1857         drag->exec();
1858 #else
1859         drag->start(Qt::MoveAction);
1860 #endif
1861
1862 }
1863
1864
1865 void DragTabBar::dragEnterEvent(QDragEnterEvent * event)
1866 {
1867         // Only accept if it's an tab-reordering request
1868         QMimeData const * m = event->mimeData();
1869         QStringList formats = m->formats();
1870         if (formats.contains("action")
1871             && m->data("action") == "tab-reordering")
1872                 event->acceptProposedAction();
1873 }
1874
1875
1876 void DragTabBar::dropEvent(QDropEvent * event)
1877 {
1878         int fromIndex = tabAt(dragStartPos_);
1879         int toIndex = tabAt(event->pos());
1880
1881         // Tell interested objects that
1882         if (fromIndex != toIndex)
1883                 tabMoveRequested(fromIndex, toIndex);
1884         event->acceptProposedAction();
1885 }
1886
1887
1888 } // namespace frontend
1889 } // namespace lyx
1890
1891 #include "moc_GuiWorkArea.cpp"