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