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, this)),
 243         context_target_pos_()
 244 {
 245 }
 246
 247
 248 GuiWorkArea::GuiWorkArea(Buffer & buffer, GuiView & gv)
 249         : buffer_view_(0), read_only_(buffer.isReadonly()), lyx_view_(0),
 250         cursor_visible_(false),
 251         need_resize_(false), schedule_redraw_(false),
 252         preedit_lines_(1), completer_(new GuiCompleter(this, 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         setReadOnly(buffer_view_->buffer().isReadonly());
 445 }
 446
 447
 448 void GuiWorkArea::processKeySym(KeySymbol const & key, KeyModifier mod)
 449 {
 450         if (lyx_view_->isFullScreen() && lyx_view_->menuBar()->isVisible()
 451                 && lyxrc.full_screen_menubar) {
 452                 // FIXME HACK: we should not have to do this here. See related comment
 453                 // in GuiView::event() (QEvent::ShortcutOverride)
 454                 lyx_view_->menuBar()->hide();
 455         }
 456
 457         // In order to avoid bad surprise in the middle of an operation,
 458         // we better stop the blinking cursor...
 459         // the cursor gets restarted in GuiView::restartCursor()
 460         stopBlinkingCursor();
 461         guiApp->processKeySym(key, mod);
 462 }
 463
 464
 465 void GuiWorkArea::dispatch(FuncRequest const & cmd0, KeyModifier mod)
 466 {
 467         // Handle drag&drop
 468         if (cmd0.action == LFUN_FILE_OPEN) {
 469                 lyx_view_->dispatch(cmd0);
 470                 return;
 471         }
 472
 473         FuncRequest cmd;
 474
 475         if (cmd0.action == LFUN_MOUSE_PRESS) {
 476                 if (mod == ShiftModifier)
 477                         cmd = FuncRequest(cmd0, "region-select");
 478                 else if (mod == ControlModifier)
 479                         cmd = FuncRequest(cmd0, "paragraph-select");
 480                 else
 481                         cmd = cmd0;
 482         }
 483         else
 484                 cmd = cmd0;
 485
 486         bool const notJustMovingTheMouse =
 487                 cmd.action != LFUN_MOUSE_MOTION || cmd.button() != mouse_button::none;
 488
 489         // In order to avoid bad surprise in the middle of an operation, we better stop
 490         // the blinking cursor.
 491         if (notJustMovingTheMouse)
 492                 stopBlinkingCursor();
 493
 494         buffer_view_->mouseEventDispatch(cmd);
 495
 496         // Skip these when selecting
 497         if (cmd.action != LFUN_MOUSE_MOTION) {
 498                 completer_->updateVisibility(false, false);
 499                 lyx_view_->updateDialogs();
 500                 lyx_view_->updateStatusBar();
 501         }
 502
 503         // GUI tweaks except with mouse motion with no button pressed.
 504         if (notJustMovingTheMouse) {
 505                 // Slight hack: this is only called currently when we
 506                 // clicked somewhere, so we force through the display
 507                 // of the new status here.
 508                 lyx_view_->clearMessage();
 509
 510                 // Show the cursor immediately after any operation
 511                 startBlinkingCursor();
 512         }
 513 }
 514
 515
 516 void GuiWorkArea::resizeBufferView()
 517 {
 518         // WARNING: Please don't put any code that will trigger a repaint here!
 519         // We are already inside a paint event.
 520         lyx_view_->setBusy(true);
 521         Point p;
 522         int h = 0;
 523         buffer_view_->cursorPosAndHeight(p, h);
 524         bool const cursor_in_view = buffer_view_->cursorInView(p, h);
 525         buffer_view_->resize(viewport()->width(), viewport()->height());
 526         if (cursor_in_view)
 527                 buffer_view_->scrollToCursor();
 528         updateScreen();
 529
 530         // Update scrollbars which might have changed due different
 531         // BufferView dimension. This is especially important when the
 532         // BufferView goes from zero-size to the real-size for the first time,
 533         // as the scrollbar paramters are then set for the first time.
 534         updateScrollbar();
 535
 536         lyx_view_->updateLayoutList();
 537         lyx_view_->setBusy(false);
 538         need_resize_ = false;
 539 }
 540
 541
 542 void GuiWorkArea::showCursor()
 543 {
 544         if (cursor_visible_)
 545                 return;
 546
 547         // RTL or not RTL
 548         bool l_shape = false;
 549         Font const & realfont = buffer_view_->cursor().real_current_font;
 550         BufferParams const & bp = buffer_view_->buffer().params();
 551         bool const samelang = realfont.language() == bp.language;
 552         bool const isrtl = realfont.isVisibleRightToLeft();
 553
 554         if (!samelang || isrtl != bp.language->rightToLeft())
 555                 l_shape = true;
 556
 557         // The ERT language hack needs fixing up
 558         if (realfont.language() == latex_language)
 559                 l_shape = false;
 560
 561         Point p;
 562         int h = 0;
 563         buffer_view_->cursorPosAndHeight(p, h);
 564         // show cursor on screen
 565         Cursor & cur = buffer_view_->cursor();
 566         bool completable = cur.inset().showCompletionCursor()
 567                 && completer_->completionAvailable()
 568                 && !completer_->popupVisible()
 569                 && !completer_->inlineVisible();
 570         if (buffer_view_->cursorInView(p, h)) {
 571                 cursor_visible_ = true;
 572                 showCursor(p.x_, p.y_, h, l_shape, isrtl, completable);
 573         }
 574 }
 575
 576
 577 void GuiWorkArea::hideCursor()
 578 {
 579         if (!cursor_visible_)
 580                 return;
 581
 582         cursor_visible_ = false;
 583         removeCursor();
 584 }
 585
 586
 587 void GuiWorkArea::toggleCursor()
 588 {
 589         if (cursor_visible_)
 590                 hideCursor();
 591         else
 592                 showCursor();
 593 }
 594
 595
 596 void GuiWorkArea::updateScrollbar()
 597 {
 598         ScrollbarParameters const & scroll_ = buffer_view_->scrollbarParameters();
 599         // WARNING: don't touch at the scrollbar value like this:
 600         //   verticalScrollBar()->setValue(scroll_.position);
 601         // because this would cause a recursive signal/slot calling with
 602         // GuiWorkArea::scrollTo
 603         verticalScrollBar()->setRange(scroll_.min, scroll_.max);
 604         verticalScrollBar()->setPageStep(scroll_.page_step);
 605         verticalScrollBar()->setSingleStep(scroll_.single_step);
 606         verticalScrollBar()->setSliderPosition(scroll_.position);
 607 }
 608
 609
 610 void GuiWorkArea::scrollTo(int value)
 611 {
 612         stopBlinkingCursor();
 613         buffer_view_->scrollDocView(value);
 614
 615         if (lyxrc.cursor_follows_scrollbar) {
 616                 buffer_view_->setCursorFromScrollbar();
 617                 lyx_view_->updateLayoutList();
 618         }
 619         // Show the cursor immediately after any operation.
 620         startBlinkingCursor();
 621         QApplication::syncX();
 622 }
 623
 624
 625 bool GuiWorkArea::event(QEvent * e)
 626 {
 627         switch (e->type()) {
 628         case QEvent::ToolTip: {
 629                 QHelpEvent * helpEvent = static_cast<QHelpEvent *>(e);
 630                 if (lyxrc.use_tooltip) {
 631                         QPoint pos = helpEvent->pos();
 632                         if (pos.x() < viewport()->width()) {
 633                                 QString s = toqstr(buffer_view_->toolTip(pos.x(), pos.y()));
 634                                 QToolTip::showText(helpEvent->globalPos(), s);
 635                         }
 636                         else
 637                                 QToolTip::hideText();
 638                 }
 639                 // Don't forget to accept the event!
 640                 e->accept();
 641                 return true;
 642         }
 643
 644         case QEvent::ShortcutOverride: {
 645                 // We catch this event in order to catch the Tab or Shift+Tab key press
 646                 // which are otherwise reserved to focus switching between controls
 647                 // within a dialog.
 648                 QKeyEvent * ke = static_cast<QKeyEvent*>(e);
 649                 if ((ke->key() != Qt::Key_Tab && ke->key() != Qt::Key_Backtab)
 650                         || ke->modifiers() & Qt::ControlModifier)
 651                         return QAbstractScrollArea::event(e);
 652                 keyPressEvent(ke);
 653                 return true;
 654         }
 655
 656         default:
 657                 return QAbstractScrollArea::event(e);
 658         }
 659         return false;
 660 }
 661
 662
 663 void GuiWorkArea::contextMenuEvent(QContextMenuEvent * e)
 664 {
 665         QPoint pos;
 666         if (e->reason() == QContextMenuEvent::Mouse)
 667                 // the position is set on mouse press
 668                 pos = context_target_pos_;
 669         else
 670                 pos = e->pos();
 671         Cursor const & cur = buffer_view_->cursor();
 672         if (e->reason() == QContextMenuEvent::Keyboard && cur.inTexted()) {
 673                 // Do not access the context menu of math right in front of before
 674                 // the cursor. This does not work when the cursor is in text.
 675                 Inset * inset = cur.paragraph().getInset(cur.pos());
 676                 if (inset && inset->asInsetMath())
 677                         --pos.rx();
 678                 else if (cur.pos() > 0) {
 679                         Inset * inset = cur.paragraph().getInset(cur.pos() - 1);
 680                         if (inset)
 681                                 ++pos.rx();
 682                 }
 683         }
 684         docstring name = buffer_view_->contextMenu(pos.x(), pos.y());
 685         if (name.empty()) {
 686                 QAbstractScrollArea::contextMenuEvent(e);
 687                 return;
 688         }
 689         QMenu * menu = guiApp->menus().menu(toqstr(name), *lyx_view_);
 690         if (!menu) {
 691                 QAbstractScrollArea::contextMenuEvent(e);
 692                 return;
 693         }
 694         // Position the menu to the right.
 695         // FIXME: menu position should be different for RTL text.
 696         menu->exec(e->globalPos());
 697         e->accept();
 698 }
 699
 700
 701 void GuiWorkArea::focusInEvent(QFocusEvent * e)
 702 {
 703         LYXERR(Debug::DEBUG, "GuiWorkArea::focusInEvent(): " << this << endl);
 704         if (lyx_view_->currentWorkArea() != this)
 705                 lyx_view_->setCurrentWorkArea(this);
 706
 707         startBlinkingCursor();
 708         QAbstractScrollArea::focusInEvent(e);
 709 }
 710
 711
 712 void GuiWorkArea::focusOutEvent(QFocusEvent * e)
 713 {
 714         LYXERR(Debug::DEBUG, "GuiWorkArea::focusOutEvent(): " << this << endl);
 715         stopBlinkingCursor();
 716         QAbstractScrollArea::focusOutEvent(e);
 717 }
 718
 719
 720 void GuiWorkArea::mousePressEvent(QMouseEvent * e)
 721 {
 722         if (dc_event_.active && dc_event_ == *e) {
 723                 dc_event_.active = false;
 724                 FuncRequest cmd(LFUN_MOUSE_TRIPLE, e->x(), e->y(),
 725                         q_button_state(e->button()));
 726                 dispatch(cmd);
 727                 e->accept();
 728                 return;
 729         }
 730
 731         if (e->button() == Qt::RightButton)
 732                 context_target_pos_ = e->pos();
 733
 734         inputContext()->reset();
 735
 736         FuncRequest const cmd(LFUN_MOUSE_PRESS, e->x(), e->y(),
 737                 q_button_state(e->button()));
 738         dispatch(cmd, q_key_state(e->modifiers()));
 739         e->accept();
 740 }
 741
 742
 743 void GuiWorkArea::mouseReleaseEvent(QMouseEvent * e)
 744 {
 745         if (synthetic_mouse_event_.timeout.running())
 746                 synthetic_mouse_event_.timeout.stop();
 747
 748         FuncRequest const cmd(LFUN_MOUSE_RELEASE, e->x(), e->y(),
 749                               q_button_state(e->button()));
 750         dispatch(cmd);
 751         e->accept();
 752 }
 753
 754
 755 void GuiWorkArea::mouseMoveEvent(QMouseEvent * e)
 756 {
 757         // we kill the triple click if we move
 758         doubleClickTimeout();
 759         FuncRequest cmd(LFUN_MOUSE_MOTION, e->x(), e->y(),
 760                 q_motion_state(e->buttons()));
 761
 762         e->accept();
 763
 764         // If we're above or below the work area...
 765         if (e->y() <= 20 || e->y() >= viewport()->height() - 20) {
 766                 // Make sure only a synthetic event can cause a page scroll,
 767                 // so they come at a steady rate:
 768                 if (e->y() <= 20)
 769                         // _Force_ a scroll up:
 770                         cmd.y = -40;
 771                 else
 772                         cmd.y = viewport()->height();
 773                 // Store the event, to be handled when the timeout expires.
 774                 synthetic_mouse_event_.cmd = cmd;
 775
 776                 if (synthetic_mouse_event_.timeout.running())
 777                         // Discard the event. Note that it _may_ be handled
 778                         // when the timeout expires if
 779                         // synthetic_mouse_event_.cmd has not been overwritten.
 780                         // Ie, when the timeout expires, we handle the
 781                         // most recent event but discard all others that
 782                         // occurred after the one used to start the timeout
 783                         // in the first place.
 784                         return;
 785
 786                 synthetic_mouse_event_.restart_timeout = true;
 787                 synthetic_mouse_event_.timeout.start();
 788                 // Fall through to handle this event...
 789
 790         } else if (synthetic_mouse_event_.timeout.running()) {
 791                 // Store the event, to be possibly handled when the timeout
 792                 // expires.
 793                 // Once the timeout has expired, normal control is returned
 794                 // to mouseMoveEvent (restart_timeout = false).
 795                 // This results in a much smoother 'feel' when moving the
 796                 // mouse back into the work area.
 797                 synthetic_mouse_event_.cmd = cmd;
 798                 synthetic_mouse_event_.restart_timeout = false;
 799                 return;
 800         }
 801
 802         // Has anything changed on-screen since the last QMouseEvent
 803         // was received?
 804         if (e->x() == synthetic_mouse_event_.x_old
 805                 && e->y() == synthetic_mouse_event_.y_old
 806                 && synthetic_mouse_event_.min_scrollbar_old == verticalScrollBar()->minimum()
 807                 && synthetic_mouse_event_.max_scrollbar_old == verticalScrollBar()->maximum()) {
 808                 // Nothing changed on-screen since the last QMouseEvent.
 809                 return;
 810         }
 811
 812         // Yes something has changed. Store the params used to check this.
 813         synthetic_mouse_event_.x_old = e->x();
 814         synthetic_mouse_event_.y_old = e->y();
 815         synthetic_mouse_event_.min_scrollbar_old = verticalScrollBar()->minimum();
 816         synthetic_mouse_event_.max_scrollbar_old = verticalScrollBar()->maximum();
 817
 818         // ... and dispatch the event to the LyX core.
 819         dispatch(cmd);
 820 }
 821
 822
 823 void GuiWorkArea::wheelEvent(QWheelEvent * ev)
 824 {
 825         // Wheel rotation by one notch results in a delta() of 120 (see
 826         // documentation of QWheelEvent)
 827         int const delta = ev->delta() / 120;
 828         if (ev->modifiers() & Qt::ControlModifier) {
 829                 docstring arg = convert<docstring>(5 * delta);
 830                 lyx::dispatch(FuncRequest(LFUN_BUFFER_ZOOM_IN, arg));
 831                 return;
 832         }
 833
 834         // Take into account the desktop wide settings.
 835         int const lines = qApp->wheelScrollLines();
 836         int const page_step = verticalScrollBar()->pageStep();
 837         // Test if the wheel mouse is set to one screen at a time.
 838         int scroll_value = lines > page_step
 839                 ? page_step : lines * verticalScrollBar()->singleStep();
 840
 841         // Take into account the rotation.
 842         scroll_value *= delta;
 843
 844         // Take into account user preference.
 845         scroll_value = int(scroll_value * lyxrc.mouse_wheel_speed);
 846         LYXERR(Debug::SCROLLING, "wheelScrollLines = " << lines
 847                         << " delta = " << delta << " scroll_value = " << scroll_value
 848                         << " page_step = " << page_step);
 849         // Now scroll.
 850         verticalScrollBar()->setValue(verticalScrollBar()->value() - scroll_value);
 851
 852         ev->accept();
 853 }
 854
 855
 856 void GuiWorkArea::generateSyntheticMouseEvent()
 857 {
 858         // Set things off to generate the _next_ 'pseudo' event.
 859         if (synthetic_mouse_event_.restart_timeout)
 860                 synthetic_mouse_event_.timeout.start();
 861
 862         // Has anything changed on-screen since the last timeout signal
 863         // was received?
 864         int const min_scrollbar = verticalScrollBar()->minimum();
 865         int const max_scrollbar = verticalScrollBar()->maximum();
 866         if (min_scrollbar == synthetic_mouse_event_.min_scrollbar_old
 867                 && max_scrollbar == synthetic_mouse_event_.max_scrollbar_old) {
 868                 return;
 869         }
 870         // Yes it has. Store the params used to check this.
 871         synthetic_mouse_event_.min_scrollbar_old = min_scrollbar;
 872         synthetic_mouse_event_.max_scrollbar_old = max_scrollbar;
 873         // ... and dispatch the event to the LyX core.
 874         dispatch(synthetic_mouse_event_.cmd);
 875 }
 876
 877
 878 void GuiWorkArea::keyPressEvent(QKeyEvent * ev)
 879 {
 880         // Do not process here some keys if dialog_mode_ is set
 881         if (dialog_mode_
 882                 && (ev->modifiers() == Qt::NoModifier
 883                     || ev->modifiers() == Qt::ShiftModifier)
 884                 && (ev->key() == Qt::Key_Escape
 885                     || ev->key() == Qt::Key_Enter
 886                     || ev->key() == Qt::Key_Return)
 887             ) {
 888                 ev->ignore();
 889                 return;
 890         }
 891
 892         // intercept some keys if completion popup is visible
 893         if (completer_->popupVisible()) {
 894                 switch (ev->key()) {
 895                 case Qt::Key_Enter:
 896                 case Qt::Key_Return:
 897                         completer_->activate();
 898                         ev->accept();
 899                         return;
 900                 }
 901         }
 902
 903         // do nothing if there are other events
 904         // (the auto repeated events come too fast)
 905         // \todo FIXME: remove hard coded Qt keys, process the key binding
 906 #ifdef Q_WS_X11
 907         if (XEventsQueued(QX11Info::display(), 0) > 1 && ev->isAutoRepeat()
 908                         && (Qt::Key_PageDown || Qt::Key_PageUp)) {
 909                 LYXERR(Debug::KEY, "system is busy: scroll key event ignored");
 910                 ev->ignore();
 911                 return;
 912         }
 913 #endif
 914
 915         LYXERR(Debug::KEY, " count: " << ev->count() << " text: " << ev->text()
 916                 << " isAutoRepeat: " << ev->isAutoRepeat() << " key: " << ev->key());
 917
 918         KeySymbol sym;
 919         setKeySymbol(&sym, ev);
 920         if (sym.isOK()) {
 921                 processKeySym(sym, q_key_state(ev->modifiers()));
 922                 ev->accept();
 923         } else {
 924                 ev->ignore();
 925         }
 926 }
 927
 928
 929 void GuiWorkArea::doubleClickTimeout()
 930 {
 931         dc_event_.active = false;
 932 }
 933
 934
 935 void GuiWorkArea::mouseDoubleClickEvent(QMouseEvent * ev)
 936 {
 937         dc_event_ = DoubleClick(ev);
 938         QTimer::singleShot(QApplication::doubleClickInterval(), this,
 939                            SLOT(doubleClickTimeout()));
 940         FuncRequest cmd(LFUN_MOUSE_DOUBLE,
 941                         ev->x(), ev->y(),
 942                         q_button_state(ev->button()));
 943         dispatch(cmd);
 944         ev->accept();
 945 }
 946
 947
 948 void GuiWorkArea::resizeEvent(QResizeEvent * ev)
 949 {
 950         QAbstractScrollArea::resizeEvent(ev);
 951         need_resize_ = true;
 952         ev->accept();
 953 }
 954
 955
 956 void GuiWorkArea::update(int x, int y, int w, int h)
 957 {
 958         viewport()->repaint(x, y, w, h);
 959 }
 960
 961
 962 void GuiWorkArea::paintEvent(QPaintEvent * ev)
 963 {
 964         QRect const rc = ev->rect();
 965         // LYXERR(Debug::PAINTING, "paintEvent begin: x: " << rc.x()
 966         //      << " y: " << rc.y() << " w: " << rc.width() << " h: " << rc.height());
 967
 968         if (need_resize_) {
 969                 screen_ = QPixmap(viewport()->width(), viewport()->height());
 970                 resizeBufferView();
 971                 if (cursor_visible_) {
 972                         hideCursor();
 973                         showCursor();
 974                 }
 975         }
 976
 977         QPainter pain(viewport());
 978         pain.drawPixmap(rc, screen_, rc);
 979         cursor_->draw(pain);
 980         ev->accept();
 981 }
 982
 983
 984 void GuiWorkArea::updateScreen()
 985 {
 986         GuiPainter pain(&screen_);
 987         buffer_view_->draw(pain);
 988 }
 989
 990
 991 void GuiWorkArea::showCursor(int x, int y, int h,
 992         bool l_shape, bool rtl, bool completable)
 993 {
 994         if (schedule_redraw_) {
 995                 // This happens when a graphic conversion is finished. As we don't know
 996                 // the size of the new graphics, it's better the update everything.
 997                 // We can't use redraw() here because this would trigger a infinite
 998                 // recursive loop with showCursor().
 999                 buffer_view_->resize(viewport()->width(), viewport()->height());
1000                 updateScreen();
1001                 updateScrollbar();
1002                 viewport()->update(QRect(0, 0, viewport()->width(), viewport()->height()));
1003                 schedule_redraw_ = false;
1004                 // Show the cursor immediately after the update.
1005                 hideCursor();
1006                 toggleCursor();
1007                 return;
1008         }
1009
1010         cursor_->update(x, y, h, l_shape, rtl, completable);
1011         cursor_->show();
1012         viewport()->update(cursor_->rect());
1013 }
1014
1015
1016 void GuiWorkArea::removeCursor()
1017 {
1018         cursor_->hide();
1019         //if (!qApp->focusWidget())
1020                 viewport()->update(cursor_->rect());
1021 }
1022
1023
1024 void GuiWorkArea::inputMethodEvent(QInputMethodEvent * e)
1025 {
1026         QString const & commit_string = e->commitString();
1027         docstring const & preedit_string
1028                 = qstring_to_ucs4(e->preeditString());
1029
1030         if (!commit_string.isEmpty()) {
1031
1032                 LYXERR(Debug::KEY, "preeditString: " << e->preeditString()
1033                         << " commitString: " << e->commitString());
1034
1035                 int key = 0;
1036
1037                 // FIXME Iwami 04/01/07: we should take care also of UTF16 surrogates here.
1038                 for (int i = 0; i != commit_string.size(); ++i) {
1039                         QKeyEvent ev(QEvent::KeyPress, key, Qt::NoModifier, commit_string[i]);
1040                         keyPressEvent(&ev);
1041                 }
1042         }
1043
1044         // Hide the cursor during the kana-kanji transformation.
1045         if (preedit_string.empty())
1046                 startBlinkingCursor();
1047         else
1048                 stopBlinkingCursor();
1049
1050         // last_width : for checking if last preedit string was/wasn't empty.
1051         static bool last_width = false;
1052         if (!last_width && preedit_string.empty()) {
1053                 // if last_width is last length of preedit string.
1054                 e->accept();
1055                 return;
1056         }
1057
1058         GuiPainter pain(&screen_);
1059         buffer_view_->updateMetrics();
1060         buffer_view_->draw(pain);
1061         FontInfo font = buffer_view_->cursor().getFont().fontInfo();
1062         FontMetrics const & fm = theFontMetrics(font);
1063         int height = fm.maxHeight();
1064         int cur_x = cursor_->rect().left();
1065         int cur_y = cursor_->rect().bottom();
1066
1067         // redraw area of preedit string.
1068         update(0, cur_y - height, viewport()->width(),
1069                 (height + 1) * preedit_lines_);
1070
1071         if (preedit_string.empty()) {
1072                 last_width = false;
1073                 preedit_lines_ = 1;
1074                 e->accept();
1075                 return;
1076         }
1077         last_width = true;
1078
1079         // att : stores an IM attribute.
1080         QList<QInputMethodEvent::Attribute> const & att = e->attributes();
1081
1082         // get attributes of input method cursor.
1083         // cursor_pos : cursor position in preedit string.
1084         size_t cursor_pos = 0;
1085         bool cursor_is_visible = false;
1086         for (int i = 0; i != att.size(); ++i) {
1087                 if (att.at(i).type == QInputMethodEvent::Cursor) {
1088                         cursor_pos = att.at(i).start;
1089                         cursor_is_visible = att.at(i).length != 0;
1090                         break;
1091                 }
1092         }
1093
1094         size_t preedit_length = preedit_string.length();
1095
1096         // get position of selection in input method.
1097         // FIXME: isn't there a way to do this simplier?
1098         // rStart : cursor position in selected string in IM.
1099         size_t rStart = 0;
1100         // rLength : selected string length in IM.
1101         size_t rLength = 0;
1102         if (cursor_pos < preedit_length) {
1103                 for (int i = 0; i != att.size(); ++i) {
1104                         if (att.at(i).type == QInputMethodEvent::TextFormat) {
1105                                 if (att.at(i).start <= int(cursor_pos)
1106                                         && int(cursor_pos) < att.at(i).start + att.at(i).length) {
1107                                                 rStart = att.at(i).start;
1108                                                 rLength = att.at(i).length;
1109                                                 if (!cursor_is_visible)
1110                                                         cursor_pos += rLength;
1111                                                 break;
1112                                 }
1113                         }
1114                 }
1115         }
1116         else {
1117                 rStart = cursor_pos;
1118                 rLength = 0;
1119         }
1120
1121         int const right_margin = buffer_view_->rightMargin();
1122         Painter::preedit_style ps;
1123         // Most often there would be only one line:
1124         preedit_lines_ = 1;
1125         for (size_t pos = 0; pos != preedit_length; ++pos) {
1126                 char_type const typed_char = preedit_string[pos];
1127                 // reset preedit string style
1128                 ps = Painter::preedit_default;
1129
1130                 // if we reached the right extremity of the screen, go to next line.
1131                 if (cur_x + fm.width(typed_char) > viewport()->width() - right_margin) {
1132                         cur_x = right_margin;
1133                         cur_y += height + 1;
1134                         ++preedit_lines_;
1135                 }
1136                 // preedit strings are displayed with dashed underline
1137                 // and partial strings are displayed white on black indicating
1138                 // that we are in selecting mode in the input method.
1139                 // FIXME: rLength == preedit_length is not a changing condition
1140                 // FIXME: should be put out of the loop.
1141                 if (pos >= rStart
1142                         && pos < rStart + rLength
1143                         && !(cursor_pos < rLength && rLength == preedit_length))
1144                         ps = Painter::preedit_selecting;
1145
1146                 if (pos == cursor_pos
1147                         && (cursor_pos < rLength && rLength == preedit_length))
1148                         ps = Painter::preedit_cursor;
1149
1150                 // draw one character and update cur_x.
1151                 cur_x += pain.preeditText(cur_x, cur_y, typed_char, font, ps);
1152         }
1153
1154         // update the preedit string screen area.
1155         update(0, cur_y - preedit_lines_*height, viewport()->width(),
1156                 (height + 1) * preedit_lines_);
1157
1158         // Don't forget to accept the event!
1159         e->accept();
1160 }
1161
1162
1163 QVariant GuiWorkArea::inputMethodQuery(Qt::InputMethodQuery query) const
1164 {
1165         QRect cur_r(0, 0, 0, 0);
1166         switch (query) {
1167                 // this is the CJK-specific composition window position and
1168                 // the context menu position when the menu key is pressed.
1169                 case Qt::ImMicroFocus:
1170                         cur_r = cursor_->rect();
1171                         if (preedit_lines_ != 1)
1172                                 cur_r.moveLeft(10);
1173                         cur_r.moveBottom(cur_r.bottom()
1174                                 + cur_r.height() * (preedit_lines_ - 1));
1175                         // return lower right of cursor in LyX.
1176                         return cur_r;
1177                 default:
1178                         return QWidget::inputMethodQuery(query);
1179         }
1180 }
1181
1182
1183 void GuiWorkArea::updateWindowTitle()
1184 {
1185         docstring maximize_title;
1186         docstring minimize_title;
1187
1188         Buffer & buf = buffer_view_->buffer();
1189         FileName const fileName = buf.fileName();
1190         if (!fileName.empty()) {
1191                 maximize_title = fileName.displayName(30);
1192                 minimize_title = from_utf8(fileName.onlyFileName());
1193                 if (buf.lyxvc().inUse()) {
1194                         if (buf.lyxvc().locker().empty())
1195                                 maximize_title +=  _(" (version control)");
1196                         else
1197                                 maximize_title +=  _(" (version control, locking)");
1198                 }
1199                 if (!buf.isClean()) {
1200                         maximize_title += _(" (changed)");
1201                         minimize_title += char_type('*');
1202                 }
1203                 if (buf.isReadonly())
1204                         maximize_title += _(" (read only)");
1205         }
1206
1207         QString title = windowTitle();
1208         QString new_title = toqstr(maximize_title);
1209         if (title == new_title)
1210                 return;
1211
1212         QWidget::setWindowTitle(new_title);
1213         QWidget::setWindowIconText(toqstr(minimize_title));
1214         titleChanged(this);
1215 }
1216
1217
1218 void GuiWorkArea::setReadOnly(bool read_only)
1219 {
1220         if (read_only_ == read_only)
1221                 return;
1222         read_only_ = read_only;
1223         updateWindowTitle();
1224         if (this == lyx_view_->currentWorkArea())
1225                 lyx_view_->updateDialogs();
1226 }
1227
1228
1229 bool GuiWorkArea::isFullScreen()
1230 {
1231         return lyx_view_ && lyx_view_->isFullScreen();
1232 }
1233
1234
1235 ////////////////////////////////////////////////////////////////////
1236 //
1237 // EmbeddedWorkArea
1238 //
1239 ////////////////////////////////////////////////////////////////////
1240
1241
1242 EmbeddedWorkArea::EmbeddedWorkArea(QWidget * w): GuiWorkArea(w)
1243 {
1244         buffer_ = theBufferList().newBuffer(
1245                 support::FileName::tempName().absFilename() + "_embedded.internal");
1246         buffer_->setUnnamed(true);
1247         buffer_->setFullyLoaded(true);
1248         setBuffer(*buffer_);
1249         setDialogMode(true);
1250 }
1251
1252
1253 EmbeddedWorkArea::~EmbeddedWorkArea()
1254 {
1255         // No need to destroy buffer and bufferview here, because it is done
1256         // in theBuffeerList() destruction loop at application exit
1257 }
1258
1259
1260 void EmbeddedWorkArea::closeEvent(QCloseEvent * ev)
1261 {
1262         disable();
1263         GuiWorkArea::closeEvent(ev);
1264 }
1265
1266
1267 void EmbeddedWorkArea::hideEvent(QHideEvent * ev)
1268 {
1269         disable();
1270         GuiWorkArea::hideEvent(ev);
1271 }
1272
1273
1274 void EmbeddedWorkArea::disable()
1275 {
1276         stopBlinkingCursor();
1277         if (view().currentWorkArea() != this)
1278                 return;
1279         // No problem if currentMainWorkArea() is 0 (setCurrentWorkArea()
1280         // tolerates it and shows the background logo), what happens if
1281         // an EmbeddedWorkArea is closed after closing all document WAs
1282         view().setCurrentWorkArea(view().currentMainWorkArea());
1283 }
1284
1285 ////////////////////////////////////////////////////////////////////
1286 //
1287 // TabWorkArea
1288 //
1289 ////////////////////////////////////////////////////////////////////
1290
1291 #ifdef Q_WS_MACX
1292 class NoTabFrameMacStyle : public QMacStyle {
1293 public:
1294         ///
1295         QRect subElementRect(SubElement element, const QStyleOption * option,
1296                              const QWidget * widget = 0) const
1297         {
1298                 QRect rect = QMacStyle::subElementRect(element, option, widget);
1299                 bool noBar = static_cast<QTabWidget const *>(widget)->count() <= 1;
1300
1301                 // The Qt Mac style puts the contents into a 3 pixel wide box
1302                 // which looks very ugly and not like other Mac applications.
1303                 // Hence we remove this here, and moreover the 16 pixel round
1304                 // frame above if the tab bar is hidden.
1305                 if (element == QStyle::SE_TabWidgetTabContents) {
1306                         rect.adjust(- rect.left(), 0, rect.left(), 0);
1307                         if (noBar)
1308                                 rect.setTop(0);
1309                 }
1310
1311                 return rect;
1312         }
1313 };
1314
1315 NoTabFrameMacStyle noTabFrameMacStyle;
1316 #endif
1317
1318
1319 TabWorkArea::TabWorkArea(QWidget * parent)
1320         : QTabWidget(parent), clicked_tab_(-1)
1321 {
1322 #ifdef Q_WS_MACX
1323         setStyle(&noTabFrameMacStyle);
1324 #endif
1325 #if QT_VERSION < 0x040500
1326         lyxrc.single_close_tab_button = true;
1327 #endif
1328
1329         QPalette pal = palette();
1330         pal.setColor(QPalette::Active, QPalette::Button,
1331                 pal.color(QPalette::Active, QPalette::Window));
1332         pal.setColor(QPalette::Disabled, QPalette::Button,
1333                 pal.color(QPalette::Disabled, QPalette::Window));
1334         pal.setColor(QPalette::Inactive, QPalette::Button,
1335                 pal.color(QPalette::Inactive, QPalette::Window));
1336
1337         QObject::connect(this, SIGNAL(currentChanged(int)),
1338                 this, SLOT(on_currentTabChanged(int)));
1339
1340         closeBufferButton = new QToolButton(this);
1341         closeBufferButton->setPalette(pal);
1342         // FIXME: rename the icon to closebuffer.png
1343         closeBufferButton->setIcon(QIcon(getPixmap("images/", "closetab", "png")));
1344         closeBufferButton->setText("Close File");
1345         closeBufferButton->setAutoRaise(true);
1346         closeBufferButton->setCursor(Qt::ArrowCursor);
1347         closeBufferButton->setToolTip(qt_("Close File"));
1348         closeBufferButton->setEnabled(true);
1349         QObject::connect(closeBufferButton, SIGNAL(clicked()),
1350                 this, SLOT(closeCurrentBuffer()));
1351         setCornerWidget(closeBufferButton, Qt::TopRightCorner);
1352
1353         // setup drag'n'drop
1354         QTabBar* tb = new DragTabBar;
1355         connect(tb, SIGNAL(tabMoveRequested(int, int)),
1356                 this, SLOT(moveTab(int, int)));
1357         tb->setElideMode(Qt::ElideNone);
1358         setTabBar(tb);
1359
1360         // make us responsible for the context menu of the tabbar
1361         tb->setContextMenuPolicy(Qt::CustomContextMenu);
1362         connect(tb, SIGNAL(customContextMenuRequested(const QPoint &)),
1363                 this, SLOT(showContextMenu(const QPoint &)));
1364 #if QT_VERSION >= 0x040500
1365         connect(tb, SIGNAL(tabCloseRequested(int)),
1366                 this, SLOT(closeTab(int)));
1367 #endif
1368
1369         setUsesScrollButtons(true);
1370 }
1371
1372
1373 void TabWorkArea::setFullScreen(bool full_screen)
1374 {
1375         for (int i = 0; i != count(); ++i) {
1376                 if (GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i)))
1377                         wa->setFullScreen(full_screen);
1378         }
1379
1380         if (lyxrc.full_screen_tabbar)
1381                 showBar(!full_screen && count() > 1);
1382 }
1383
1384
1385 void TabWorkArea::showBar(bool show)
1386 {
1387         tabBar()->setEnabled(show);
1388         tabBar()->setVisible(show);
1389         closeBufferButton->setVisible(show && lyxrc.single_close_tab_button);
1390 #if QT_VERSION >= 0x040500
1391         setTabsClosable(!lyxrc.single_close_tab_button);
1392 #endif
1393 }
1394
1395
1396 GuiWorkArea * TabWorkArea::currentWorkArea()
1397 {
1398         if (count() == 0)
1399                 return 0;
1400
1401         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(currentWidget());
1402         LASSERT(wa, /**/);
1403         return wa;
1404 }
1405
1406
1407 GuiWorkArea * TabWorkArea::workArea(Buffer & buffer)
1408 {
1409         for (int i = 0; i != count(); ++i) {
1410                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i));
1411                 LASSERT(wa, return 0);
1412                 if (&wa->bufferView().buffer() == &buffer)
1413                         return wa;
1414         }
1415         return 0;
1416 }
1417
1418
1419 void TabWorkArea::closeAll()
1420 {
1421         while (count()) {
1422                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(0));
1423                 LASSERT(wa, /**/);
1424                 removeTab(0);
1425                 delete wa;
1426         }
1427 }
1428
1429
1430 bool TabWorkArea::setCurrentWorkArea(GuiWorkArea * work_area)
1431 {
1432         LASSERT(work_area, /**/);
1433         int index = indexOf(work_area);
1434         if (index == -1)
1435                 return false;
1436
1437         if (index == currentIndex())
1438                 // Make sure the work area is up to date.
1439                 on_currentTabChanged(index);
1440         else
1441                 // Switch to the work area.
1442                 setCurrentIndex(index);
1443         work_area->setFocus();
1444
1445         return true;
1446 }
1447
1448
1449 GuiWorkArea * TabWorkArea::addWorkArea(Buffer & buffer, GuiView & view)
1450 {
1451         GuiWorkArea * wa = new GuiWorkArea(buffer, view);
1452         wa->setUpdatesEnabled(false);
1453         // Hide tabbar if there's no tab (avoid a resize and a flashing tabbar
1454         // when hiding it again below).
1455         if (!(currentWorkArea() && currentWorkArea()->isFullScreen()))
1456                 showBar(count() > 0);
1457         addTab(wa, wa->windowTitle());
1458         QObject::connect(wa, SIGNAL(titleChanged(GuiWorkArea *)),
1459                 this, SLOT(updateTabTexts()));
1460         if (currentWorkArea() && currentWorkArea()->isFullScreen())
1461                 setFullScreen(true);
1462         else
1463                 // Hide tabbar if there's only one tab.
1464                 showBar(count() > 1);
1465
1466         updateTabTexts();
1467
1468         return wa;
1469 }
1470
1471
1472 bool TabWorkArea::removeWorkArea(GuiWorkArea * work_area)
1473 {
1474         LASSERT(work_area, return false);
1475         int index = indexOf(work_area);
1476         if (index == -1)
1477                 return false;
1478
1479         work_area->setUpdatesEnabled(false);
1480         removeTab(index);
1481         delete work_area;
1482
1483         if (count()) {
1484                 // make sure the next work area is enabled.
1485                 currentWidget()->setUpdatesEnabled(true);
1486                 if (currentWorkArea() && currentWorkArea()->isFullScreen())
1487                         setFullScreen(true);
1488                 else
1489                         // Show tabbar only if there's more than one tab.
1490                         showBar(count() > 1);
1491         } else
1492                 lastWorkAreaRemoved();
1493
1494         updateTabTexts();
1495
1496         return true;
1497 }
1498
1499
1500 void TabWorkArea::on_currentTabChanged(int i)
1501 {
1502         // returns e.g. on application destruction
1503         if (i == -1)
1504                 return;
1505         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i));
1506         LASSERT(wa, return);
1507         wa->setUpdatesEnabled(true);
1508         wa->redraw(true);
1509         wa->setFocus();
1510         ///
1511         currentWorkAreaChanged(wa);
1512
1513         LYXERR(Debug::GUI, "currentTabChanged " << i
1514                 << " File: " << wa->bufferView().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::hideCurrentTab()
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().closeWorkArea(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(hideCurrentTab()));
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"