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 "LyX.h"
  36 #include "LyXRC.h"
  37 #include "LyXVC.h"
  38 #include "qt_helpers.h"
  39 #include "Text.h"
  40 #include "TextMetrics.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 "support/bind.h"
  73
  74 #include <cmath>
  75
  76 #ifdef Q_WS_WIN
  77 int const CursorWidth = 2;
  78 #else
  79 int const CursorWidth = 1;
  80 #endif
  81 int const TabIndicatorWidth = 3;
  82
  83 #undef KeyPress
  84 #undef NoModifier
  85
  86 using namespace std;
  87 using namespace lyx::support;
  88
  89 namespace lyx {
  90
  91
  92 /// return the LyX mouse button state from Qt's
  93 static mouse_button::state q_button_state(Qt::MouseButton button)
  94 {
  95         mouse_button::state b = mouse_button::none;
  96         switch (button) {
  97                 case Qt::LeftButton:
  98                         b = mouse_button::button1;
  99                         break;
 100                 case Qt::MidButton:
 101                         b = mouse_button::button2;
 102                         break;
 103                 case Qt::RightButton:
 104                         b = mouse_button::button3;
 105                         break;
 106                 default:
 107                         break;
 108         }
 109         return b;
 110 }
 111
 112
 113 /// return the LyX mouse button state from Qt's
 114 mouse_button::state q_motion_state(Qt::MouseButtons state)
 115 {
 116         mouse_button::state b = mouse_button::none;
 117         if (state & Qt::LeftButton)
 118                 b |= mouse_button::button1;
 119         if (state & Qt::MidButton)
 120                 b |= mouse_button::button2;
 121         if (state & Qt::RightButton)
 122                 b |= mouse_button::button3;
 123         return b;
 124 }
 125
 126
 127 namespace frontend {
 128
 129 class CursorWidget {
 130 public:
 131         CursorWidget() {}
 132
 133         void draw(QPainter & painter)
 134         {
 135                 if (!show_ || !rect_.isValid())
 136                         return;
 137
 138                 int y = rect_.top();
 139                 int l = x_ - rect_.left();
 140                 int r = rect_.right() - x_;
 141                 int bot = rect_.bottom();
 142
 143                 // draw vertica linel
 144                 painter.fillRect(x_, y, CursorWidth, rect_.height(), color_);
 145
 146                 // draw RTL/LTR indication
 147                 painter.setPen(color_);
 148                 if (l_shape_) {
 149                         if (rtl_)
 150                                 painter.drawLine(x_, bot, x_ - l, bot);
 151                         else
 152                                 painter.drawLine(x_, bot, x_ + CursorWidth + r, bot);
 153                 }
 154
 155                 // draw completion triangle
 156                 if (completable_) {
 157                         int m = y + rect_.height() / 2;
 158                         int d = TabIndicatorWidth - 1;
 159                         if (rtl_) {
 160                                 painter.drawLine(x_ - 1, m - d, x_ - 1 - d, m);
 161                                 painter.drawLine(x_ - 1, m + d, x_ - 1 - d, m);
 162                         } else {
 163                                 painter.drawLine(x_ + CursorWidth, m - d, x_ + CursorWidth + d, m);
 164                                 painter.drawLine(x_ + CursorWidth, m + d, x_ + CursorWidth + d, m);
 165                         }
 166                 }
 167         }
 168
 169         void update(int x, int y, int h, bool l_shape,
 170                 bool rtl, bool completable)
 171         {
 172                 color_ = guiApp->colorCache().get(Color_cursor);
 173                 l_shape_ = l_shape;
 174                 rtl_ = rtl;
 175                 completable_ = completable;
 176                 x_ = x;
 177
 178                 // extension to left and right
 179                 int l = 0;
 180                 int r = 0;
 181
 182                 // RTL/LTR indication
 183                 if (l_shape_) {
 184                         if (rtl)
 185                                 l += h / 3;
 186                         else
 187                                 r += h / 3;
 188                 }
 189
 190                 // completion triangle
 191                 if (completable_) {
 192                         if (rtl)
 193                                 l = max(l, TabIndicatorWidth);
 194                         else
 195                                 r = max(r, TabIndicatorWidth);
 196                 }
 197
 198                 // compute overall rectangle
 199                 rect_ = QRect(x - l, y, CursorWidth + r + l, h);
 200         }
 201
 202         void show(bool set_show = true) { show_ = set_show; }
 203         void hide() { show_ = false; }
 204
 205         QRect const & rect() { return rect_; }
 206
 207 private:
 208         /// cursor is in RTL or LTR text
 209         bool rtl_;
 210         /// indication for RTL or LTR
 211         bool l_shape_;
 212         /// triangle to show that a completion is available
 213         bool completable_;
 214         ///
 215         bool show_;
 216         ///
 217         QColor color_;
 218         /// rectangle, possibly with l_shape and completion triangle
 219         QRect rect_;
 220         /// x position (were the vertical line is drawn)
 221         int x_;
 222 };
 223
 224
 225 // This is a 'heartbeat' generating synthetic mouse move events when the
 226 // cursor is at the top or bottom edge of the viewport. One scroll per 0.2 s
 227 SyntheticMouseEvent::SyntheticMouseEvent()
 228         : timeout(200), restart_timeout(true)
 229 {}
 230
 231
 232 GuiWorkArea::GuiWorkArea(QWidget *)
 233         : buffer_view_(0), lyx_view_(0),
 234         cursor_visible_(false),
 235         need_resize_(false), schedule_redraw_(false),
 236         preedit_lines_(1), completer_(new GuiCompleter(this, this)),
 237         context_target_pos_()
 238 {
 239 }
 240
 241
 242 GuiWorkArea::GuiWorkArea(Buffer & buffer, GuiView & gv)
 243         : buffer_view_(0), read_only_(buffer.isReadonly()), lyx_view_(0),
 244         cursor_visible_(false),
 245         need_resize_(false), schedule_redraw_(false),
 246         preedit_lines_(1), completer_(new GuiCompleter(this, this)),
 247         context_target_pos_()
 248 {
 249         setGuiView(gv);
 250         setBuffer(buffer);
 251         init();
 252 }
 253
 254
 255 void GuiWorkArea::init()
 256 {
 257         // Setup the signals
 258         connect(&cursor_timeout_, SIGNAL(timeout()),
 259                 this, SLOT(toggleCursor()));
 260
 261         int const time = QApplication::cursorFlashTime() / 2;
 262         if (time > 0) {
 263                 cursor_timeout_.setInterval(time);
 264                 cursor_timeout_.start();
 265         } else {
 266                 // let's initialize this just to be safe
 267                 cursor_timeout_.setInterval(500);
 268         }
 269
 270         screen_ = QPixmap(viewport()->width(), viewport()->height());
 271         // With Qt4.5 a mouse event will happen before the first paint event
 272         // so make sure that the buffer view has an up to date metrics.
 273         buffer_view_->resize(viewport()->width(), viewport()->height());
 274         cursor_ = new frontend::CursorWidget();
 275         cursor_->hide();
 276
 277         setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 278         setAcceptDrops(true);
 279         setMouseTracking(true);
 280         setMinimumSize(100, 70);
 281         setFrameStyle(QFrame::NoFrame);
 282         updateWindowTitle();
 283
 284         viewport()->setAutoFillBackground(false);
 285         // We don't need double-buffering nor SystemBackground on
 286         // the viewport because we have our own backing pixmap.
 287         viewport()->setAttribute(Qt::WA_NoSystemBackground);
 288
 289         setFocusPolicy(Qt::StrongFocus);
 290
 291         viewport()->setCursor(Qt::IBeamCursor);
 292
 293         synthetic_mouse_event_.timeout.timeout.connect(
 294                 bind(&GuiWorkArea::generateSyntheticMouseEvent,
 295                                         this));
 296
 297         // Initialize the vertical Scroll Bar
 298         QObject::connect(verticalScrollBar(), SIGNAL(valueChanged(int)),
 299                 this, SLOT(scrollTo(int)));
 300
 301         LYXERR(Debug::GUI, "viewport width: " << viewport()->width()
 302                 << "  viewport height: " << viewport()->height());
 303
 304         // Enables input methods for asian languages.
 305         // Must be set when creating custom text editing widgets.
 306         setAttribute(Qt::WA_InputMethodEnabled, true);
 307
 308         dialog_mode_ = false;
 309 }
 310
 311
 312 GuiWorkArea::~GuiWorkArea()
 313 {
 314         buffer_view_->buffer().workAreaManager().remove(this);
 315         delete buffer_view_;
 316         delete cursor_;
 317         // Completer has a QObject parent and is thus automatically destroyed.
 318         // See #4758.
 319         // delete completer_;
 320 }
 321
 322
 323 void GuiWorkArea::setGuiView(GuiView & gv)
 324 {
 325         lyx_view_ = &gv;
 326 }
 327
 328
 329 void GuiWorkArea::setBuffer(Buffer & buffer)
 330 {
 331         delete buffer_view_;
 332         buffer_view_ = new BufferView(buffer);
 333         buffer.workAreaManager().add(this);
 334
 335         // HACK: Prevents an additional redraw when the scrollbar pops up
 336         // which regularily happens on documents with more than one page.
 337         // The policy  should be set to "Qt::ScrollBarAsNeeded" soon.
 338         // Since we have no geometry information yet, we assume that
 339         // a document needs a scrollbar if there is more then four
 340         // paragraph in the outermost text.
 341         if (buffer.text().paragraphs().size() > 4)
 342                 setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
 343         QTimer::singleShot(50, this, SLOT(fixVerticalScrollBar()));
 344 }
 345
 346
 347 void GuiWorkArea::fixVerticalScrollBar()
 348 {
 349         if (!isFullScreen())
 350                 setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
 351 }
 352
 353
 354 void GuiWorkArea::close()
 355 {
 356         lyx_view_->removeWorkArea(this);
 357 }
 358
 359
 360 void GuiWorkArea::setFullScreen(bool full_screen)
 361 {
 362         buffer_view_->setFullScreen(full_screen);
 363         setFrameStyle(QFrame::NoFrame);
 364         if (full_screen) {
 365                 setFrameStyle(QFrame::NoFrame);
 366                 if (lyxrc.full_screen_scrollbar)
 367                         setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 368         } else
 369                 setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
 370 }
 371
 372
 373 BufferView & GuiWorkArea::bufferView()
 374 {
 375         return *buffer_view_;
 376 }
 377
 378
 379 BufferView const & GuiWorkArea::bufferView() const
 380 {
 381         return *buffer_view_;
 382 }
 383
 384
 385 void GuiWorkArea::stopBlinkingCursor()
 386 {
 387         cursor_timeout_.stop();
 388         hideCursor();
 389 }
 390
 391
 392 void GuiWorkArea::startBlinkingCursor()
 393 {
 394         // do not show the cursor if the view is busy
 395         if (view().busy())
 396                 return;
 397
 398         Point p;
 399         int h = 0;
 400         buffer_view_->cursorPosAndHeight(p, h);
 401         // Don't start blinking if the cursor isn't on screen.
 402         if (!buffer_view_->cursorInView(p, h))
 403                 return;
 404
 405         showCursor();
 406
 407         //we're not supposed to cache this value.
 408         int const time = QApplication::cursorFlashTime() / 2;
 409         if (time <= 0)
 410                 return;
 411         cursor_timeout_.setInterval(time);
 412         cursor_timeout_.start();
 413 }
 414
 415
 416 void GuiWorkArea::redraw(bool update_metrics)
 417 {
 418         if (!isVisible())
 419                 // No need to redraw in this case.
 420                 return;
 421
 422         // No need to do anything if this is the current view. The BufferView
 423         // metrics are already up to date.
 424         if (update_metrics || lyx_view_ != guiApp->currentView()
 425                 || lyx_view_->currentWorkArea() != this) {
 426                 // FIXME: it would be nice to optimize for the off-screen case.
 427                 buffer_view_->updateMetrics();
 428                 buffer_view_->cursor().fixIfBroken();
 429         }
 430
 431         // update cursor position, because otherwise it has to wait until
 432         // the blinking interval is over
 433         if (cursor_visible_) {
 434                 hideCursor();
 435                 showCursor();
 436         }
 437
 438         LYXERR(Debug::WORKAREA, "WorkArea::redraw screen");
 439         updateScreen();
 440         update(0, 0, viewport()->width(), viewport()->height());
 441
 442         /// \warning: scrollbar updating *must* be done after the BufferView is drawn
 443         /// because \c BufferView::updateScrollbar() is called in \c BufferView::draw().
 444         updateScrollbar();
 445         lyx_view_->updateStatusBar();
 446
 447         if (lyxerr.debugging(Debug::WORKAREA))
 448                 buffer_view_->coordCache().dump();
 449
 450         setReadOnly(buffer_view_->buffer().isReadonly());
 451 }
 452
 453
 454 void GuiWorkArea::processKeySym(KeySymbol const & key, KeyModifier mod)
 455 {
 456         if (lyx_view_->isFullScreen() && lyx_view_->menuBar()->isVisible()
 457                 && lyxrc.full_screen_menubar) {
 458                 // FIXME HACK: we should not have to do this here. See related comment
 459                 // in GuiView::event() (QEvent::ShortcutOverride)
 460                 lyx_view_->menuBar()->hide();
 461         }
 462
 463         // In order to avoid bad surprise in the middle of an operation,
 464         // we better stop the blinking cursor...
 465         // the cursor gets restarted in GuiView::restartCursor()
 466         stopBlinkingCursor();
 467         guiApp->processKeySym(key, mod);
 468 }
 469
 470
 471 void GuiWorkArea::dispatch(FuncRequest const & cmd0, KeyModifier mod)
 472 {
 473         // Handle drag&drop
 474         if (cmd0.action() == LFUN_FILE_OPEN) {
 475                 DispatchResult dr;
 476                 lyx_view_->dispatch(cmd0, dr);
 477                 return;
 478         }
 479
 480         FuncRequest cmd;
 481
 482         if (cmd0.action() == LFUN_MOUSE_PRESS) {
 483                 if (mod == ShiftModifier)
 484                         cmd = FuncRequest(cmd0, "region-select");
 485                 else if (mod == ControlModifier)
 486                         cmd = FuncRequest(cmd0, "paragraph-select");
 487                 else
 488                         cmd = cmd0;
 489         }
 490         else
 491                 cmd = cmd0;
 492
 493         bool const notJustMovingTheMouse =
 494                 cmd.action() != LFUN_MOUSE_MOTION || cmd.button() != mouse_button::none;
 495
 496         // In order to avoid bad surprise in the middle of an operation, we better stop
 497         // the blinking cursor.
 498         if (notJustMovingTheMouse)
 499                 stopBlinkingCursor();
 500
 501         buffer_view_->mouseEventDispatch(cmd);
 502
 503         // Skip these when selecting
 504         if (cmd.action() != LFUN_MOUSE_MOTION) {
 505                 completer_->updateVisibility(false, false);
 506                 lyx_view_->updateDialogs();
 507                 lyx_view_->updateStatusBar();
 508         }
 509
 510         // GUI tweaks except with mouse motion with no button pressed.
 511         if (notJustMovingTheMouse) {
 512                 // Slight hack: this is only called currently when we
 513                 // clicked somewhere, so we force through the display
 514                 // of the new status here.
 515                 lyx_view_->clearMessage();
 516
 517                 // Show the cursor immediately after any operation
 518                 startBlinkingCursor();
 519         }
 520 }
 521
 522
 523 void GuiWorkArea::resizeBufferView()
 524 {
 525         // WARNING: Please don't put any code that will trigger a repaint here!
 526         // We are already inside a paint event.
 527         lyx_view_->setBusy(true);
 528         Point p;
 529         int h = 0;
 530         buffer_view_->cursorPosAndHeight(p, h);
 531         bool const cursor_in_view = buffer_view_->cursorInView(p, h);
 532         buffer_view_->resize(viewport()->width(), viewport()->height());
 533         if (cursor_in_view)
 534                 buffer_view_->scrollToCursor();
 535         updateScreen();
 536
 537         // Update scrollbars which might have changed due different
 538         // BufferView dimension. This is especially important when the
 539         // BufferView goes from zero-size to the real-size for the first time,
 540         // as the scrollbar paramters are then set for the first time.
 541         updateScrollbar();
 542
 543         lyx_view_->updateLayoutList();
 544         lyx_view_->setBusy(false);
 545         need_resize_ = false;
 546 }
 547
 548
 549 void GuiWorkArea::showCursor()
 550 {
 551         if (cursor_visible_)
 552                 return;
 553
 554         Point p;
 555         int h = 0;
 556         buffer_view_->cursorPosAndHeight(p, h);
 557         if (!buffer_view_->cursorInView(p, h))
 558                 return;
 559
 560         // RTL or not RTL
 561         bool l_shape = false;
 562         Font const & realfont = buffer_view_->cursor().real_current_font;
 563         BufferParams const & bp = buffer_view_->buffer().params();
 564         bool const samelang = realfont.language() == bp.language;
 565         bool const isrtl = realfont.isVisibleRightToLeft();
 566
 567         if (!samelang || isrtl != bp.language->rightToLeft())
 568                 l_shape = true;
 569
 570         // The ERT language hack needs fixing up
 571         if (realfont.language() == latex_language)
 572                 l_shape = false;
 573
 574         // show cursor on screen
 575         Cursor & cur = buffer_view_->cursor();
 576         bool completable = cur.inset().showCompletionCursor()
 577                 && completer_->completionAvailable()
 578                 && !completer_->popupVisible()
 579                 && !completer_->inlineVisible();
 580         cursor_visible_ = true;
 581         showCursor(p.x_, p.y_, h, l_shape, isrtl, completable);
 582 }
 583
 584
 585 void GuiWorkArea::hideCursor()
 586 {
 587         if (!cursor_visible_)
 588                 return;
 589
 590         cursor_visible_ = false;
 591         removeCursor();
 592 }
 593
 594
 595 void GuiWorkArea::toggleCursor()
 596 {
 597         if (cursor_visible_)
 598                 hideCursor();
 599         else
 600                 showCursor();
 601 }
 602
 603
 604 void GuiWorkArea::updateScrollbar()
 605 {
 606         ScrollbarParameters const & scroll_ = buffer_view_->scrollbarParameters();
 607         // WARNING: don't touch at the scrollbar value like this:
 608         //   verticalScrollBar()->setValue(scroll_.position);
 609         // because this would cause a recursive signal/slot calling with
 610         // GuiWorkArea::scrollTo
 611         verticalScrollBar()->setRange(scroll_.min, scroll_.max);
 612         verticalScrollBar()->setPageStep(scroll_.page_step);
 613         verticalScrollBar()->setSingleStep(scroll_.single_step);
 614         verticalScrollBar()->setSliderPosition(scroll_.position);
 615 }
 616
 617
 618 void GuiWorkArea::scrollTo(int value)
 619 {
 620         stopBlinkingCursor();
 621         buffer_view_->scrollDocView(value, true);
 622
 623         if (lyxrc.cursor_follows_scrollbar) {
 624                 buffer_view_->setCursorFromScrollbar();
 625                 lyx_view_->updateLayoutList();
 626         }
 627         // Show the cursor immediately after any operation.
 628         startBlinkingCursor();
 629         QApplication::syncX();
 630 }
 631
 632
 633 bool GuiWorkArea::event(QEvent * e)
 634 {
 635         switch (e->type()) {
 636         case QEvent::ToolTip: {
 637                 QHelpEvent * helpEvent = static_cast<QHelpEvent *>(e);
 638                 if (lyxrc.use_tooltip) {
 639                         QPoint pos = helpEvent->pos();
 640                         if (pos.x() < viewport()->width()) {
 641                                 QString s = toqstr(buffer_view_->toolTip(pos.x(), pos.y()));
 642                                 QToolTip::showText(helpEvent->globalPos(), s);
 643                         }
 644                         else
 645                                 QToolTip::hideText();
 646                 }
 647                 // Don't forget to accept the event!
 648                 e->accept();
 649                 return true;
 650         }
 651
 652         case QEvent::ShortcutOverride: {
 653                 // We catch this event in order to catch the Tab or Shift+Tab key press
 654                 // which are otherwise reserved to focus switching between controls
 655                 // within a dialog.
 656                 QKeyEvent * ke = static_cast<QKeyEvent*>(e);
 657                 if ((ke->key() != Qt::Key_Tab && ke->key() != Qt::Key_Backtab)
 658                         || ke->modifiers() & Qt::ControlModifier)
 659                         return QAbstractScrollArea::event(e);
 660                 keyPressEvent(ke);
 661                 return true;
 662         }
 663
 664         default:
 665                 return QAbstractScrollArea::event(e);
 666         }
 667         return false;
 668 }
 669
 670
 671 void GuiWorkArea::contextMenuEvent(QContextMenuEvent * e)
 672 {
 673         QPoint pos;
 674         if (e->reason() == QContextMenuEvent::Mouse)
 675                 // the position is set on mouse press
 676                 pos = context_target_pos_;
 677         else
 678                 pos = e->pos();
 679         Cursor const & cur = buffer_view_->cursor();
 680         if (e->reason() == QContextMenuEvent::Keyboard && cur.inTexted()) {
 681                 // Do not access the context menu of math right in front of before
 682                 // the cursor. This does not work when the cursor is in text.
 683                 Inset * inset = cur.paragraph().getInset(cur.pos());
 684                 if (inset && inset->asInsetMath())
 685                         --pos.rx();
 686                 else if (cur.pos() > 0) {
 687                         Inset * inset = cur.paragraph().getInset(cur.pos() - 1);
 688                         if (inset)
 689                                 ++pos.rx();
 690                 }
 691         }
 692         docstring name = buffer_view_->contextMenu(pos.x(), pos.y());
 693         if (name.empty()) {
 694                 QAbstractScrollArea::contextMenuEvent(e);
 695                 return;
 696         }
 697         QMenu * menu = guiApp->menus().menu(toqstr(name), *lyx_view_);
 698         if (!menu) {
 699                 QAbstractScrollArea::contextMenuEvent(e);
 700                 return;
 701         }
 702         // Position the menu to the right.
 703         // FIXME: menu position should be different for RTL text.
 704         menu->exec(e->globalPos());
 705         e->accept();
 706 }
 707
 708
 709 void GuiWorkArea::focusInEvent(QFocusEvent * e)
 710 {
 711         LYXERR(Debug::DEBUG, "GuiWorkArea::focusInEvent(): " << this << endl);
 712         if (lyx_view_->currentWorkArea() != this)
 713                 lyx_view_->setCurrentWorkArea(this);
 714
 715         startBlinkingCursor();
 716         QAbstractScrollArea::focusInEvent(e);
 717 }
 718
 719
 720 void GuiWorkArea::focusOutEvent(QFocusEvent * e)
 721 {
 722         LYXERR(Debug::DEBUG, "GuiWorkArea::focusOutEvent(): " << this << endl);
 723         stopBlinkingCursor();
 724         QAbstractScrollArea::focusOutEvent(e);
 725 }
 726
 727
 728 void GuiWorkArea::mousePressEvent(QMouseEvent * e)
 729 {
 730         if (dc_event_.active && dc_event_ == *e) {
 731                 dc_event_.active = false;
 732                 FuncRequest cmd(LFUN_MOUSE_TRIPLE, e->x(), e->y(),
 733                         q_button_state(e->button()));
 734                 dispatch(cmd);
 735                 e->accept();
 736                 return;
 737         }
 738
 739         if (e->button() == Qt::RightButton)
 740                 context_target_pos_ = e->pos();
 741
 742         inputContext()->reset();
 743
 744         FuncRequest const cmd(LFUN_MOUSE_PRESS, e->x(), e->y(),
 745                 q_button_state(e->button()));
 746         dispatch(cmd, q_key_state(e->modifiers()));
 747         e->accept();
 748 }
 749
 750
 751 void GuiWorkArea::mouseReleaseEvent(QMouseEvent * e)
 752 {
 753         if (synthetic_mouse_event_.timeout.running())
 754                 synthetic_mouse_event_.timeout.stop();
 755
 756         FuncRequest const cmd(LFUN_MOUSE_RELEASE, e->x(), e->y(),
 757                               q_button_state(e->button()));
 758         dispatch(cmd);
 759         e->accept();
 760 }
 761
 762
 763 void GuiWorkArea::mouseMoveEvent(QMouseEvent * e)
 764 {
 765         // we kill the triple click if we move
 766         doubleClickTimeout();
 767         FuncRequest cmd(LFUN_MOUSE_MOTION, e->x(), e->y(),
 768                 q_motion_state(e->buttons()));
 769
 770         e->accept();
 771
 772         // If we're above or below the work area...
 773         if ((e->y() <= 20 || e->y() >= viewport()->height() - 20)
 774                         && e->buttons() == mouse_button::button1) {
 775                 // Make sure only a synthetic event can cause a page scroll,
 776                 // so they come at a steady rate:
 777                 if (e->y() <= 20)
 778                         // _Force_ a scroll up:
 779                         cmd.set_y(e->y() - 21);
 780                 else
 781                         cmd.set_y(e->y() + 21);
 782                 // Store the event, to be handled when the timeout expires.
 783                 synthetic_mouse_event_.cmd = cmd;
 784
 785                 if (synthetic_mouse_event_.timeout.running()) {
 786                         // Discard the event. Note that it _may_ be handled
 787                         // when the timeout expires if
 788                         // synthetic_mouse_event_.cmd has not been overwritten.
 789                         // Ie, when the timeout expires, we handle the
 790                         // most recent event but discard all others that
 791                         // occurred after the one used to start the timeout
 792                         // in the first place.
 793                         return;
 794                 }
 795
 796                 synthetic_mouse_event_.restart_timeout = true;
 797                 synthetic_mouse_event_.timeout.start();
 798                 // Fall through to handle this event...
 799
 800         } else if (synthetic_mouse_event_.timeout.running()) {
 801                 // Store the event, to be possibly handled when the timeout
 802                 // expires.
 803                 // Once the timeout has expired, normal control is returned
 804                 // to mouseMoveEvent (restart_timeout = false).
 805                 // This results in a much smoother 'feel' when moving the
 806                 // mouse back into the work area.
 807                 synthetic_mouse_event_.cmd = cmd;
 808                 synthetic_mouse_event_.restart_timeout = false;
 809                 return;
 810         }
 811         dispatch(cmd);
 812 }
 813
 814
 815 void GuiWorkArea::wheelEvent(QWheelEvent * ev)
 816 {
 817         // Wheel rotation by one notch results in a delta() of 120 (see
 818         // documentation of QWheelEvent)
 819         int const delta = ev->delta() / 120;
 820         if (ev->modifiers() & Qt::ControlModifier) {
 821                 docstring arg = convert<docstring>(5 * delta);
 822                 lyx::dispatch(FuncRequest(LFUN_BUFFER_ZOOM_IN, arg));
 823                 return;
 824         }
 825
 826         // Take into account the desktop wide settings.
 827         int const lines = qApp->wheelScrollLines();
 828         int const page_step = verticalScrollBar()->pageStep();
 829         // Test if the wheel mouse is set to one screen at a time.
 830         int scroll_value = lines > page_step
 831                 ? page_step : lines * verticalScrollBar()->singleStep();
 832
 833         // Take into account the rotation.
 834         scroll_value *= delta;
 835
 836         // Take into account user preference.
 837         scroll_value = int(scroll_value * lyxrc.mouse_wheel_speed);
 838         LYXERR(Debug::SCROLLING, "wheelScrollLines = " << lines
 839                         << " delta = " << delta << " scroll_value = " << scroll_value
 840                         << " page_step = " << page_step);
 841         // Now scroll.
 842         verticalScrollBar()->setValue(verticalScrollBar()->value() - scroll_value);
 843
 844         ev->accept();
 845 }
 846
 847
 848 void GuiWorkArea::generateSyntheticMouseEvent()
 849 {
 850         int const e_y = synthetic_mouse_event_.cmd.y();
 851         int const wh = buffer_view_->workHeight();
 852         bool const up = e_y < 0;
 853         bool const down = e_y > wh;
 854
 855         // Set things off to generate the _next_ 'pseudo' event.
 856         int step = 50;
 857         if (synthetic_mouse_event_.restart_timeout) {
 858                 // This is some magic formulae to determine the speed
 859                 // of scrolling related to the position of the mouse.
 860                 int time = 200;
 861                 if (up || down) {
 862                         int dist = up ? -e_y : e_y - wh;
 863                         time = max(min(200, 250000 / (dist * dist)), 1) ;
 864
 865                         if (time < 40) {
 866                                 step = 80000 / (time * time);
 867                                 time = 40;
 868                         }
 869                 }
 870                 synthetic_mouse_event_.timeout.setTimeout(time);
 871                 synthetic_mouse_event_.timeout.start();
 872         }
 873
 874         // Can we scroll further ?
 875         int const value = verticalScrollBar()->value();
 876         if (value == verticalScrollBar()->maximum()
 877                   || value == verticalScrollBar()->minimum()) {
 878                 synthetic_mouse_event_.timeout.stop();
 879                 return;
 880         }
 881
 882         // Scroll
 883         if (step <= 2 * wh) {
 884                 buffer_view_->scroll(up ? -step : step);
 885                 buffer_view_->updateMetrics();
 886         } else {
 887                 buffer_view_->scrollDocView(value + up ? -step : step, false);
 888         }
 889
 890         // In which paragraph do we have to set the cursor ?
 891         Cursor & cur = buffer_view_->cursor();
 892         TextMetrics const & tm = buffer_view_->textMetrics(cur.text());
 893
 894         pair<pit_type, const ParagraphMetrics *> p = up ? tm.first() : tm.last();
 895         ParagraphMetrics const & pm = *p.second;
 896         pit_type const pit = p.first;
 897
 898         if (pm.rows().empty())
 899                 return;
 900
 901         // Find the row at which we set the cursor.
 902         RowList::const_iterator rit = pm.rows().begin();
 903         RowList::const_iterator rlast = pm.rows().end();
 904         int yy = pm.position() - pm.ascent();
 905         for (--rlast; rit != rlast; ++rit) {
 906                 int h = rit->height();
 907                 if ((up && yy + h > 0)
 908                           || (!up && yy + h > wh - defaultRowHeight()))
 909                         break;
 910                 yy += h;
 911         }
 912
 913         // Find the position of the cursor
 914         bool bound;
 915         int x = synthetic_mouse_event_.cmd.x();
 916         pos_type const pos = rit->pos() + tm.getColumnNearX(pit, *rit, x, bound);
 917
 918         // Set the cursor
 919         cur.pit() = pit;
 920         cur.pos() = pos;
 921         cur.boundary(bound);
 922
 923         buffer_view_->buffer().changed(false);
 924         return;
 925 }
 926
 927
 928 void GuiWorkArea::keyPressEvent(QKeyEvent * ev)
 929 {
 930         // Do not process here some keys if dialog_mode_ is set
 931         if (dialog_mode_
 932                 && (ev->modifiers() == Qt::NoModifier
 933                     || ev->modifiers() == Qt::ShiftModifier)
 934                 && (ev->key() == Qt::Key_Escape
 935                     || ev->key() == Qt::Key_Enter
 936                     || ev->key() == Qt::Key_Return)
 937             ) {
 938                 ev->ignore();
 939                 return;
 940         }
 941
 942         // intercept some keys if completion popup is visible
 943         if (completer_->popupVisible()) {
 944                 switch (ev->key()) {
 945                 case Qt::Key_Enter:
 946                 case Qt::Key_Return:
 947                         completer_->activate();
 948                         ev->accept();
 949                         return;
 950                 }
 951         }
 952
 953         // do nothing if there are other events
 954         // (the auto repeated events come too fast)
 955         // it looks like this is only needed on X11
 956 #ifdef Q_WS_X11
 957         if (qApp->hasPendingEvents() && ev->isAutoRepeat()) {
 958                 LYXERR(Debug::KEY, "system is busy: keyPress event ignored");
 959                 ev->ignore();
 960                 return;
 961         }
 962 #endif
 963
 964         LYXERR(Debug::KEY, " count: " << ev->count() << " text: " << ev->text()
 965                 << " isAutoRepeat: " << ev->isAutoRepeat() << " key: " << ev->key());
 966
 967         KeySymbol sym;
 968         setKeySymbol(&sym, ev);
 969         if (sym.isOK()) {
 970                 processKeySym(sym, q_key_state(ev->modifiers()));
 971                 ev->accept();
 972         } else {
 973                 ev->ignore();
 974         }
 975 }
 976
 977
 978 void GuiWorkArea::doubleClickTimeout()
 979 {
 980         dc_event_.active = false;
 981 }
 982
 983
 984 void GuiWorkArea::mouseDoubleClickEvent(QMouseEvent * ev)
 985 {
 986         dc_event_ = DoubleClick(ev);
 987         QTimer::singleShot(QApplication::doubleClickInterval(), this,
 988                            SLOT(doubleClickTimeout()));
 989         FuncRequest cmd(LFUN_MOUSE_DOUBLE,
 990                         ev->x(), ev->y(),
 991                         q_button_state(ev->button()));
 992         dispatch(cmd);
 993         ev->accept();
 994 }
 995
 996
 997 void GuiWorkArea::resizeEvent(QResizeEvent * ev)
 998 {
 999         QAbstractScrollArea::resizeEvent(ev);
1000         need_resize_ = true;
1001         ev->accept();
1002 }
1003
1004
1005 void GuiWorkArea::update(int x, int y, int w, int h)
1006 {
1007         viewport()->repaint(x, y, w, h);
1008 }
1009
1010
1011 void GuiWorkArea::paintEvent(QPaintEvent * ev)
1012 {
1013         QRect const rc = ev->rect();
1014         // LYXERR(Debug::PAINTING, "paintEvent begin: x: " << rc.x()
1015         //      << " y: " << rc.y() << " w: " << rc.width() << " h: " << rc.height());
1016
1017         if (need_resize_) {
1018                 screen_ = QPixmap(viewport()->width(), viewport()->height());
1019                 resizeBufferView();
1020                 if (cursor_visible_) {
1021                         hideCursor();
1022                         showCursor();
1023                 }
1024         }
1025
1026         QPainter pain(viewport());
1027         pain.drawPixmap(rc, screen_, rc);
1028         cursor_->draw(pain);
1029         ev->accept();
1030 }
1031
1032
1033 void GuiWorkArea::updateScreen()
1034 {
1035         GuiPainter pain(&screen_);
1036         buffer_view_->draw(pain);
1037 }
1038
1039
1040 void GuiWorkArea::showCursor(int x, int y, int h,
1041         bool l_shape, bool rtl, bool completable)
1042 {
1043         if (schedule_redraw_) {
1044                 // This happens when a graphic conversion is finished. As we don't know
1045                 // the size of the new graphics, it's better the update everything.
1046                 // We can't use redraw() here because this would trigger a infinite
1047                 // recursive loop with showCursor().
1048                 buffer_view_->resize(viewport()->width(), viewport()->height());
1049                 updateScreen();
1050                 updateScrollbar();
1051                 viewport()->update(QRect(0, 0, viewport()->width(), viewport()->height()));
1052                 schedule_redraw_ = false;
1053                 // Show the cursor immediately after the update.
1054                 hideCursor();
1055                 toggleCursor();
1056                 return;
1057         }
1058
1059         cursor_->update(x, y, h, l_shape, rtl, completable);
1060         cursor_->show();
1061         viewport()->update(cursor_->rect());
1062 }
1063
1064
1065 void GuiWorkArea::removeCursor()
1066 {
1067         cursor_->hide();
1068         //if (!qApp->focusWidget())
1069                 viewport()->update(cursor_->rect());
1070 }
1071
1072
1073 void GuiWorkArea::inputMethodEvent(QInputMethodEvent * e)
1074 {
1075         QString const & commit_string = e->commitString();
1076         docstring const & preedit_string
1077                 = qstring_to_ucs4(e->preeditString());
1078
1079         if (!commit_string.isEmpty()) {
1080
1081                 LYXERR(Debug::KEY, "preeditString: " << e->preeditString()
1082                         << " commitString: " << e->commitString());
1083
1084                 int key = 0;
1085
1086                 // FIXME Iwami 04/01/07: we should take care also of UTF16 surrogates here.
1087                 for (int i = 0; i != commit_string.size(); ++i) {
1088                         QKeyEvent ev(QEvent::KeyPress, key, Qt::NoModifier, commit_string[i]);
1089                         keyPressEvent(&ev);
1090                 }
1091         }
1092
1093         // Hide the cursor during the kana-kanji transformation.
1094         if (preedit_string.empty())
1095                 startBlinkingCursor();
1096         else
1097                 stopBlinkingCursor();
1098
1099         // last_width : for checking if last preedit string was/wasn't empty.
1100         static bool last_width = false;
1101         if (!last_width && preedit_string.empty()) {
1102                 // if last_width is last length of preedit string.
1103                 e->accept();
1104                 return;
1105         }
1106
1107         GuiPainter pain(&screen_);
1108         buffer_view_->updateMetrics();
1109         buffer_view_->draw(pain);
1110         FontInfo font = buffer_view_->cursor().getFont().fontInfo();
1111         FontMetrics const & fm = theFontMetrics(font);
1112         int height = fm.maxHeight();
1113         int cur_x = cursor_->rect().left();
1114         int cur_y = cursor_->rect().bottom();
1115
1116         // redraw area of preedit string.
1117         update(0, cur_y - height, viewport()->width(),
1118                 (height + 1) * preedit_lines_);
1119
1120         if (preedit_string.empty()) {
1121                 last_width = false;
1122                 preedit_lines_ = 1;
1123                 e->accept();
1124                 return;
1125         }
1126         last_width = true;
1127
1128         // att : stores an IM attribute.
1129         QList<QInputMethodEvent::Attribute> const & att = e->attributes();
1130
1131         // get attributes of input method cursor.
1132         // cursor_pos : cursor position in preedit string.
1133         size_t cursor_pos = 0;
1134         bool cursor_is_visible = false;
1135         for (int i = 0; i != att.size(); ++i) {
1136                 if (att.at(i).type == QInputMethodEvent::Cursor) {
1137                         cursor_pos = att.at(i).start;
1138                         cursor_is_visible = att.at(i).length != 0;
1139                         break;
1140                 }
1141         }
1142
1143         size_t preedit_length = preedit_string.length();
1144
1145         // get position of selection in input method.
1146         // FIXME: isn't there a way to do this simplier?
1147         // rStart : cursor position in selected string in IM.
1148         size_t rStart = 0;
1149         // rLength : selected string length in IM.
1150         size_t rLength = 0;
1151         if (cursor_pos < preedit_length) {
1152                 for (int i = 0; i != att.size(); ++i) {
1153                         if (att.at(i).type == QInputMethodEvent::TextFormat) {
1154                                 if (att.at(i).start <= int(cursor_pos)
1155                                         && int(cursor_pos) < att.at(i).start + att.at(i).length) {
1156                                                 rStart = att.at(i).start;
1157                                                 rLength = att.at(i).length;
1158                                                 if (!cursor_is_visible)
1159                                                         cursor_pos += rLength;
1160                                                 break;
1161                                 }
1162                         }
1163                 }
1164         }
1165         else {
1166                 rStart = cursor_pos;
1167                 rLength = 0;
1168         }
1169
1170         int const right_margin = buffer_view_->rightMargin();
1171         Painter::preedit_style ps;
1172         // Most often there would be only one line:
1173         preedit_lines_ = 1;
1174         for (size_t pos = 0; pos != preedit_length; ++pos) {
1175                 char_type const typed_char = preedit_string[pos];
1176                 // reset preedit string style
1177                 ps = Painter::preedit_default;
1178
1179                 // if we reached the right extremity of the screen, go to next line.
1180                 if (cur_x + fm.width(typed_char) > viewport()->width() - right_margin) {
1181                         cur_x = right_margin;
1182                         cur_y += height + 1;
1183                         ++preedit_lines_;
1184                 }
1185                 // preedit strings are displayed with dashed underline
1186                 // and partial strings are displayed white on black indicating
1187                 // that we are in selecting mode in the input method.
1188                 // FIXME: rLength == preedit_length is not a changing condition
1189                 // FIXME: should be put out of the loop.
1190                 if (pos >= rStart
1191                         && pos < rStart + rLength
1192                         && !(cursor_pos < rLength && rLength == preedit_length))
1193                         ps = Painter::preedit_selecting;
1194
1195                 if (pos == cursor_pos
1196                         && (cursor_pos < rLength && rLength == preedit_length))
1197                         ps = Painter::preedit_cursor;
1198
1199                 // draw one character and update cur_x.
1200                 cur_x += pain.preeditText(cur_x, cur_y, typed_char, font, ps);
1201         }
1202
1203         // update the preedit string screen area.
1204         update(0, cur_y - preedit_lines_*height, viewport()->width(),
1205                 (height + 1) * preedit_lines_);
1206
1207         // Don't forget to accept the event!
1208         e->accept();
1209 }
1210
1211
1212 QVariant GuiWorkArea::inputMethodQuery(Qt::InputMethodQuery query) const
1213 {
1214         QRect cur_r(0, 0, 0, 0);
1215         switch (query) {
1216                 // this is the CJK-specific composition window position and
1217                 // the context menu position when the menu key is pressed.
1218                 case Qt::ImMicroFocus:
1219                         cur_r = cursor_->rect();
1220                         if (preedit_lines_ != 1)
1221                                 cur_r.moveLeft(10);
1222                         cur_r.moveBottom(cur_r.bottom()
1223                                 + cur_r.height() * (preedit_lines_ - 1));
1224                         // return lower right of cursor in LyX.
1225                         return cur_r;
1226                 default:
1227                         return QWidget::inputMethodQuery(query);
1228         }
1229 }
1230
1231
1232 void GuiWorkArea::updateWindowTitle()
1233 {
1234         docstring maximize_title;
1235         docstring minimize_title;
1236
1237         Buffer & buf = buffer_view_->buffer();
1238         FileName const fileName = buf.fileName();
1239         if (!fileName.empty()) {
1240                 maximize_title = fileName.displayName(30);
1241                 minimize_title = from_utf8(fileName.onlyFileName());
1242                 if (buf.lyxvc().inUse()) {
1243                         if (buf.lyxvc().locking())
1244                                 maximize_title +=  _(" (version control, locking)");
1245                         else
1246                                 maximize_title +=  _(" (version control)");
1247                 }
1248                 if (!buf.isClean()) {
1249                         maximize_title += _(" (changed)");
1250                         minimize_title += char_type('*');
1251                 }
1252                 if (buf.isReadonly())
1253                         maximize_title += _(" (read only)");
1254         }
1255
1256         QString title = windowTitle();
1257         QString new_title = toqstr(maximize_title);
1258         if (title == new_title)
1259                 return;
1260
1261         QWidget::setWindowTitle(new_title);
1262         QWidget::setWindowIconText(toqstr(minimize_title));
1263         titleChanged(this);
1264 }
1265
1266
1267 void GuiWorkArea::setReadOnly(bool read_only)
1268 {
1269         if (read_only_ == read_only)
1270                 return;
1271         read_only_ = read_only;
1272         updateWindowTitle();
1273         if (this == lyx_view_->currentWorkArea())
1274                 lyx_view_->updateDialogs();
1275 }
1276
1277
1278 bool GuiWorkArea::isFullScreen()
1279 {
1280         return lyx_view_ && lyx_view_->isFullScreen();
1281 }
1282
1283
1284 ////////////////////////////////////////////////////////////////////
1285 //
1286 // EmbeddedWorkArea
1287 //
1288 ////////////////////////////////////////////////////////////////////
1289
1290
1291 EmbeddedWorkArea::EmbeddedWorkArea(QWidget * w): GuiWorkArea(w)
1292 {
1293         buffer_ = theBufferList().newBuffer(
1294                 support::FileName::tempName().absFileName() + "_embedded.internal");
1295         buffer_->setUnnamed(true);
1296         buffer_->setFullyLoaded(true);
1297         setBuffer(*buffer_);
1298         setDialogMode(true);
1299 }
1300
1301
1302 EmbeddedWorkArea::~EmbeddedWorkArea()
1303 {
1304         // No need to destroy buffer and bufferview here, because it is done
1305         // in theBuffeerList() destruction loop at application exit
1306 }
1307
1308
1309 void EmbeddedWorkArea::closeEvent(QCloseEvent * ev)
1310 {
1311         disable();
1312         GuiWorkArea::closeEvent(ev);
1313 }
1314
1315
1316 void EmbeddedWorkArea::hideEvent(QHideEvent * ev)
1317 {
1318         disable();
1319         GuiWorkArea::hideEvent(ev);
1320 }
1321
1322
1323 QSize EmbeddedWorkArea::sizeHint () const
1324 {
1325         // FIXME(?):
1326         // GuiWorkArea sets the size to the screen's viewport
1327         // by returning a value this gets overridden
1328         // EmbeddedWorkArea is now sized to fit in the layout
1329         // of the parent, and has a minimum size set in GuiWorkArea
1330         // which is what we return here
1331         return QSize(100, 70);
1332 }
1333
1334
1335 void EmbeddedWorkArea::disable()
1336 {
1337         stopBlinkingCursor();
1338         if (view().currentWorkArea() != this)
1339                 return;
1340         // No problem if currentMainWorkArea() is 0 (setCurrentWorkArea()
1341         // tolerates it and shows the background logo), what happens if
1342         // an EmbeddedWorkArea is closed after closing all document WAs
1343         view().setCurrentWorkArea(view().currentMainWorkArea());
1344 }
1345
1346 ////////////////////////////////////////////////////////////////////
1347 //
1348 // TabWorkArea
1349 //
1350 ////////////////////////////////////////////////////////////////////
1351
1352 #ifdef Q_WS_MACX
1353 class NoTabFrameMacStyle : public QMacStyle {
1354 public:
1355         ///
1356         QRect subElementRect(SubElement element, const QStyleOption * option,
1357                              const QWidget * widget = 0) const
1358         {
1359                 QRect rect = QMacStyle::subElementRect(element, option, widget);
1360                 bool noBar = static_cast<QTabWidget const *>(widget)->count() <= 1;
1361
1362                 // The Qt Mac style puts the contents into a 3 pixel wide box
1363                 // which looks very ugly and not like other Mac applications.
1364                 // Hence we remove this here, and moreover the 16 pixel round
1365                 // frame above if the tab bar is hidden.
1366                 if (element == QStyle::SE_TabWidgetTabContents) {
1367                         rect.adjust(- rect.left(), 0, rect.left(), 0);
1368                         if (noBar)
1369                                 rect.setTop(0);
1370                 }
1371
1372                 return rect;
1373         }
1374 };
1375
1376 NoTabFrameMacStyle noTabFrameMacStyle;
1377 #endif
1378
1379
1380 TabWorkArea::TabWorkArea(QWidget * parent)
1381         : QTabWidget(parent), clicked_tab_(-1)
1382 {
1383 #ifdef Q_WS_MACX
1384         setStyle(&noTabFrameMacStyle);
1385 #endif
1386 #if QT_VERSION < 0x040500
1387         lyxrc.single_close_tab_button = true;
1388 #endif
1389
1390         QPalette pal = palette();
1391         pal.setColor(QPalette::Active, QPalette::Button,
1392                 pal.color(QPalette::Active, QPalette::Window));
1393         pal.setColor(QPalette::Disabled, QPalette::Button,
1394                 pal.color(QPalette::Disabled, QPalette::Window));
1395         pal.setColor(QPalette::Inactive, QPalette::Button,
1396                 pal.color(QPalette::Inactive, QPalette::Window));
1397
1398         QObject::connect(this, SIGNAL(currentChanged(int)),
1399                 this, SLOT(on_currentTabChanged(int)));
1400
1401         closeBufferButton = new QToolButton(this);
1402         closeBufferButton->setPalette(pal);
1403         // FIXME: rename the icon to closebuffer.png
1404         closeBufferButton->setIcon(QIcon(getPixmap("images/", "closetab", "png")));
1405         closeBufferButton->setText("Close File");
1406         closeBufferButton->setAutoRaise(true);
1407         closeBufferButton->setCursor(Qt::ArrowCursor);
1408         closeBufferButton->setToolTip(qt_("Close File"));
1409         closeBufferButton->setEnabled(true);
1410         QObject::connect(closeBufferButton, SIGNAL(clicked()),
1411                 this, SLOT(closeCurrentBuffer()));
1412         setCornerWidget(closeBufferButton, Qt::TopRightCorner);
1413
1414         // setup drag'n'drop
1415         QTabBar* tb = new DragTabBar;
1416         connect(tb, SIGNAL(tabMoveRequested(int, int)),
1417                 this, SLOT(moveTab(int, int)));
1418         tb->setElideMode(Qt::ElideNone);
1419         setTabBar(tb);
1420
1421         // make us responsible for the context menu of the tabbar
1422         tb->setContextMenuPolicy(Qt::CustomContextMenu);
1423         connect(tb, SIGNAL(customContextMenuRequested(const QPoint &)),
1424                 this, SLOT(showContextMenu(const QPoint &)));
1425 #if QT_VERSION >= 0x040500
1426         connect(tb, SIGNAL(tabCloseRequested(int)),
1427                 this, SLOT(closeTab(int)));
1428 #endif
1429
1430         setUsesScrollButtons(true);
1431 }
1432
1433
1434 void TabWorkArea::mouseDoubleClickEvent(QMouseEvent * event)
1435 {
1436         if (event->button() != Qt::LeftButton)
1437                 return;
1438
1439         // return early if double click on existing tabs
1440         for (int i = 0; i < count(); ++i)
1441                 if (tabBar()->tabRect(i).contains(event->pos()))
1442                         return;
1443
1444         dispatch(FuncRequest(LFUN_BUFFER_NEW));
1445 }
1446
1447
1448 void TabWorkArea::setFullScreen(bool full_screen)
1449 {
1450         for (int i = 0; i != count(); ++i) {
1451                 if (GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i)))
1452                         wa->setFullScreen(full_screen);
1453         }
1454
1455         if (lyxrc.full_screen_tabbar)
1456                 showBar(!full_screen && count() > 1);
1457 }
1458
1459
1460 void TabWorkArea::showBar(bool show)
1461 {
1462         tabBar()->setEnabled(show);
1463         tabBar()->setVisible(show);
1464         closeBufferButton->setVisible(show && lyxrc.single_close_tab_button);
1465 #if QT_VERSION >= 0x040500
1466         setTabsClosable(!lyxrc.single_close_tab_button);
1467 #endif
1468 }
1469
1470
1471 GuiWorkArea * TabWorkArea::currentWorkArea()
1472 {
1473         if (count() == 0)
1474                 return 0;
1475
1476         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(currentWidget());
1477         LASSERT(wa, /**/);
1478         return wa;
1479 }
1480
1481
1482 GuiWorkArea * TabWorkArea::workArea(Buffer & buffer)
1483 {
1484         // FIXME: this method doesn't work if we have more than work area
1485         // showing the same buffer.
1486         for (int i = 0; i != count(); ++i) {
1487                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i));
1488                 LASSERT(wa, return 0);
1489                 if (&wa->bufferView().buffer() == &buffer)
1490                         return wa;
1491         }
1492         return 0;
1493 }
1494
1495
1496 void TabWorkArea::closeAll()
1497 {
1498         while (count()) {
1499                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(0));
1500                 LASSERT(wa, /**/);
1501                 removeTab(0);
1502                 delete wa;
1503         }
1504 }
1505
1506
1507 bool TabWorkArea::setCurrentWorkArea(GuiWorkArea * work_area)
1508 {
1509         LASSERT(work_area, /**/);
1510         int index = indexOf(work_area);
1511         if (index == -1)
1512                 return false;
1513
1514         if (index == currentIndex())
1515                 // Make sure the work area is up to date.
1516                 on_currentTabChanged(index);
1517         else
1518                 // Switch to the work area.
1519                 setCurrentIndex(index);
1520         work_area->setFocus();
1521
1522         return true;
1523 }
1524
1525
1526 GuiWorkArea * TabWorkArea::addWorkArea(Buffer & buffer, GuiView & view)
1527 {
1528         GuiWorkArea * wa = new GuiWorkArea(buffer, view);
1529         wa->setUpdatesEnabled(false);
1530         // Hide tabbar if there's no tab (avoid a resize and a flashing tabbar
1531         // when hiding it again below).
1532         if (!(currentWorkArea() && currentWorkArea()->isFullScreen()))
1533                 showBar(count() > 0);
1534         addTab(wa, wa->windowTitle());
1535         QObject::connect(wa, SIGNAL(titleChanged(GuiWorkArea *)),
1536                 this, SLOT(updateTabTexts()));
1537         if (currentWorkArea() && currentWorkArea()->isFullScreen())
1538                 setFullScreen(true);
1539         else
1540                 // Hide tabbar if there's only one tab.
1541                 showBar(count() > 1);
1542
1543         updateTabTexts();
1544
1545         return wa;
1546 }
1547
1548
1549 bool TabWorkArea::removeWorkArea(GuiWorkArea * work_area)
1550 {
1551         LASSERT(work_area, return false);
1552         int index = indexOf(work_area);
1553         if (index == -1)
1554                 return false;
1555
1556         work_area->setUpdatesEnabled(false);
1557         removeTab(index);
1558         delete work_area;
1559
1560         if (count()) {
1561                 // make sure the next work area is enabled.
1562                 currentWidget()->setUpdatesEnabled(true);
1563                 if (currentWorkArea() && currentWorkArea()->isFullScreen())
1564                         setFullScreen(true);
1565                 else
1566                         // Show tabbar only if there's more than one tab.
1567                         showBar(count() > 1);
1568         } else
1569                 lastWorkAreaRemoved();
1570
1571         updateTabTexts();
1572
1573         return true;
1574 }
1575
1576
1577 void TabWorkArea::on_currentTabChanged(int i)
1578 {
1579         // returns e.g. on application destruction
1580         if (i == -1)
1581                 return;
1582         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i));
1583         LASSERT(wa, return);
1584         wa->setUpdatesEnabled(true);
1585         wa->redraw(true);
1586         wa->setFocus();
1587         ///
1588         currentWorkAreaChanged(wa);
1589
1590         LYXERR(Debug::GUI, "currentTabChanged " << i
1591                 << " File: " << wa->bufferView().buffer().absFileName());
1592 }
1593
1594
1595 void TabWorkArea::closeCurrentBuffer()
1596 {
1597         GuiWorkArea * wa;
1598         if (clicked_tab_ == -1)
1599                 wa = currentWorkArea();
1600         else {
1601                 wa = dynamic_cast<GuiWorkArea *>(widget(clicked_tab_));
1602                 LASSERT(wa, /**/);
1603         }
1604         wa->view().closeWorkArea(wa);
1605 }
1606
1607
1608 void TabWorkArea::hideCurrentTab()
1609 {
1610         GuiWorkArea * wa;
1611         if (clicked_tab_ == -1)
1612                 wa = currentWorkArea();
1613         else {
1614                 wa = dynamic_cast<GuiWorkArea *>(widget(clicked_tab_));
1615                 LASSERT(wa, /**/);
1616         }
1617         wa->view().hideWorkArea(wa);
1618 }
1619
1620
1621 void TabWorkArea::closeTab(int index)
1622 {
1623         on_currentTabChanged(index);
1624         GuiWorkArea * wa;
1625         if (index == -1)
1626                 wa = currentWorkArea();
1627         else {
1628                 wa = dynamic_cast<GuiWorkArea *>(widget(index));
1629                 LASSERT(wa, /**/);
1630         }
1631         wa->view().closeWorkArea(wa);
1632 }
1633
1634
1635 ///
1636 class DisplayPath {
1637 public:
1638         /// make vector happy
1639         DisplayPath() {}
1640         ///
1641         DisplayPath(int tab, FileName const & filename)
1642                 : tab_(tab)
1643         {
1644                 filename_ = (filename.extension() == "lyx") ?
1645                         toqstr(filename.onlyFileNameWithoutExt())
1646                         : toqstr(filename.onlyFileName());
1647                 postfix_ = toqstr(filename.absoluteFilePath()).
1648                         split("/", QString::SkipEmptyParts);
1649                 postfix_.pop_back();
1650                 abs_ = toqstr(filename.absoluteFilePath());
1651                 dottedPrefix_ = false;
1652         }
1653
1654         /// Absolute path for debugging.
1655         QString abs() const
1656         {
1657                 return abs_;
1658         }
1659         /// Add the first segment from the postfix or three dots to the prefix.
1660         /// Merge multiple dot tripples. In fact dots are added lazily, i.e. only
1661         /// when really needed.
1662         void shiftPathSegment(bool dotted)
1663         {
1664                 if (postfix_.count() <= 0)
1665                         return;
1666
1667                 if (!dotted) {
1668                         if (dottedPrefix_ && !prefix_.isEmpty())
1669                                 prefix_ += ".../";
1670                         prefix_ += postfix_.front() + "/";
1671                 }
1672                 dottedPrefix_ = dotted && !prefix_.isEmpty();
1673                 postfix_.pop_front();
1674         }
1675         ///
1676         QString displayString() const
1677         {
1678                 if (prefix_.isEmpty())
1679                         return filename_;
1680
1681                 bool dots = dottedPrefix_ || !postfix_.isEmpty();
1682                 return prefix_ + (dots ? ".../" : "") + filename_;
1683         }
1684         ///
1685         QString forecastPathString() const
1686         {
1687                 if (postfix_.count() == 0)
1688                         return displayString();
1689
1690                 return prefix_
1691                         + (dottedPrefix_ ? ".../" : "")
1692                         + postfix_.front() + "/";
1693         }
1694         ///
1695         bool final() const { return postfix_.empty(); }
1696         ///
1697         int tab() const { return tab_; }
1698
1699 private:
1700         ///
1701         QString prefix_;
1702         ///
1703         QStringList postfix_;
1704         ///
1705         QString filename_;
1706         ///
1707         QString abs_;
1708         ///
1709         int tab_;
1710         ///
1711         bool dottedPrefix_;
1712 };
1713
1714
1715 ///
1716 bool operator<(DisplayPath const & a, DisplayPath const & b)
1717 {
1718         return a.displayString() < b.displayString();
1719 }
1720
1721 ///
1722 bool operator==(DisplayPath const & a, DisplayPath const & b)
1723 {
1724         return a.displayString() == b.displayString();
1725 }
1726
1727
1728 void TabWorkArea::updateTabTexts()
1729 {
1730         size_t n = count();
1731         if (n == 0)
1732                 return;
1733         std::list<DisplayPath> paths;
1734         typedef std::list<DisplayPath>::iterator It;
1735
1736         // collect full names first: path into postfix, empty prefix and
1737         // filename without extension
1738         for (size_t i = 0; i < n; ++i) {
1739                 GuiWorkArea * i_wa = dynamic_cast<GuiWorkArea *>(widget(i));
1740                 FileName const fn = i_wa->bufferView().buffer().fileName();
1741                 paths.push_back(DisplayPath(i, fn));
1742         }
1743
1744         // go through path segments and see if it helps to make the path more unique
1745         bool somethingChanged = true;
1746         bool allFinal = false;
1747         while (somethingChanged && !allFinal) {
1748                 // adding path segments changes order
1749                 paths.sort();
1750
1751                 LYXERR(Debug::GUI, "updateTabTexts() iteration start");
1752                 somethingChanged = false;
1753                 allFinal = true;
1754
1755                 // find segments which are not unique (i.e. non-atomic)
1756                 It it = paths.begin();
1757                 It segStart = it;
1758                 QString segString = it->displayString();
1759                 for (; it != paths.end(); ++it) {
1760                         // look to the next item
1761                         It next = it;
1762                         ++next;
1763
1764                         // final?
1765                         allFinal = allFinal && it->final();
1766
1767                         LYXERR(Debug::GUI, "it = " << it->abs()
1768                                << " => " << it->displayString());
1769
1770                         // still the same segment?
1771                         QString nextString;
1772                         if ((next != paths.end()
1773                              && (nextString = next->displayString()) == segString))
1774                                 continue;
1775                         LYXERR(Debug::GUI, "segment ended");
1776
1777                         // only a trivial one with one element?
1778                         if (it == segStart) {
1779                                 // start new segment
1780                                 segStart = next;
1781                                 segString = nextString;
1782                                 continue;
1783                         }
1784
1785                         // we found a non-atomic segment segStart <= sit <= it < next.
1786                         // Shift path segments and hope for the best
1787                         // that it makes the path more unique.
1788                         somethingChanged = true;
1789                         It sit = segStart;
1790                         QString dspString = sit->forecastPathString();
1791                         LYXERR(Debug::GUI, "first forecast found for "
1792                                << sit->abs() << " => " << dspString);
1793                         ++sit;
1794                         bool moreUnique = false;
1795                         for (; sit != next; ++sit) {
1796                                 if (sit->forecastPathString() != dspString) {
1797                                         LYXERR(Debug::GUI, "different forecast found for "
1798                                                 << sit->abs() << " => " << sit->forecastPathString());
1799                                         moreUnique = true;
1800                                         break;
1801                                 }
1802                                 LYXERR(Debug::GUI, "same forecast found for "
1803                                         << sit->abs() << " => " << dspString);
1804                         }
1805
1806                         // if the path segment helped, add it. Otherwise add dots
1807                         bool dots = !moreUnique;
1808                         LYXERR(Debug::GUI, "using dots = " << dots);
1809                         for (sit = segStart; sit != next; ++sit) {
1810                                 sit->shiftPathSegment(dots);
1811                                 LYXERR(Debug::GUI, "shifting "
1812                                         << sit->abs() << " => " << sit->displayString());
1813                         }
1814
1815                         // start new segment
1816                         segStart = next;
1817                         segString = nextString;
1818                 }
1819         }
1820
1821         // set new tab titles
1822         for (It it = paths.begin(); it != paths.end(); ++it) {
1823                 GuiWorkArea * i_wa = dynamic_cast<GuiWorkArea *>(widget(it->tab()));
1824                 Buffer & buf = i_wa->bufferView().buffer();
1825                 if (!buf.fileName().empty() && !buf.isClean())
1826                         setTabText(it->tab(), it->displayString() + "*");
1827                 else
1828                         setTabText(it->tab(), it->displayString());
1829         }
1830 }
1831
1832
1833 void TabWorkArea::showContextMenu(const QPoint & pos)
1834 {
1835         // which tab?
1836         clicked_tab_ = static_cast<DragTabBar *>(tabBar())->tabAt(pos);
1837         if (clicked_tab_ == -1)
1838                 return;
1839
1840         // show tab popup
1841         QMenu popup;
1842         popup.addAction(QIcon(getPixmap("images/", "hidetab", "png")),
1843                 qt_("Hide tab"), this, SLOT(hideCurrentTab()));
1844         popup.addAction(QIcon(getPixmap("images/", "closetab", "png")),
1845                 qt_("Close tab"), this, SLOT(closeCurrentBuffer()));
1846         popup.exec(tabBar()->mapToGlobal(pos));
1847
1848         clicked_tab_ = -1;
1849 }
1850
1851
1852 void TabWorkArea::moveTab(int fromIndex, int toIndex)
1853 {
1854         QWidget * w = widget(fromIndex);
1855         QIcon icon = tabIcon(fromIndex);
1856         QString text = tabText(fromIndex);
1857
1858         setCurrentIndex(fromIndex);
1859         removeTab(fromIndex);
1860         insertTab(toIndex, w, icon, text);
1861         setCurrentIndex(toIndex);
1862 }
1863
1864
1865 DragTabBar::DragTabBar(QWidget* parent)
1866         : QTabBar(parent)
1867 {
1868         setAcceptDrops(true);
1869 #if QT_VERSION >= 0x040500
1870         setTabsClosable(!lyxrc.single_close_tab_button);
1871 #endif
1872 }
1873
1874
1875 #if QT_VERSION < 0x040300
1876 int DragTabBar::tabAt(QPoint const & position) const
1877 {
1878         const int max = count();
1879         for (int i = 0; i < max; ++i) {
1880                 if (tabRect(i).contains(position))
1881                         return i;
1882         }
1883         return -1;
1884 }
1885 #endif
1886
1887
1888 void DragTabBar::mousePressEvent(QMouseEvent * event)
1889 {
1890         if (event->button() == Qt::LeftButton)
1891                 dragStartPos_ = event->pos();
1892         QTabBar::mousePressEvent(event);
1893 }
1894
1895
1896 void DragTabBar::mouseMoveEvent(QMouseEvent * event)
1897 {
1898         // If the left button isn't pressed anymore then return
1899         if (!(event->buttons() & Qt::LeftButton))
1900                 return;
1901
1902         // If the distance is too small then return
1903         if ((event->pos() - dragStartPos_).manhattanLength()
1904             < QApplication::startDragDistance())
1905                 return;
1906
1907         // did we hit something after all?
1908         int tab = tabAt(dragStartPos_);
1909         if (tab == -1)
1910                 return;
1911
1912         // simulate button release to remove highlight from button
1913         int i = currentIndex();
1914         QMouseEvent me(QEvent::MouseButtonRelease, dragStartPos_,
1915                 event->button(), event->buttons(), 0);
1916         QTabBar::mouseReleaseEvent(&me);
1917         setCurrentIndex(i);
1918
1919         // initiate Drag
1920         QDrag * drag = new QDrag(this);
1921         QMimeData * mimeData = new QMimeData;
1922         // a crude way to distinguish tab-reodering drops from other ones
1923         mimeData->setData("action", "tab-reordering") ;
1924         drag->setMimeData(mimeData);
1925
1926 #if QT_VERSION >= 0x040300
1927         // get tab pixmap as cursor
1928         QRect r = tabRect(tab);
1929         QPixmap pixmap(r.size());
1930         render(&pixmap, - r.topLeft());
1931         drag->setPixmap(pixmap);
1932         drag->exec();
1933 #else
1934         drag->start(Qt::MoveAction);
1935 #endif
1936
1937 }
1938
1939
1940 void DragTabBar::dragEnterEvent(QDragEnterEvent * event)
1941 {
1942         // Only accept if it's an tab-reordering request
1943         QMimeData const * m = event->mimeData();
1944         QStringList formats = m->formats();
1945         if (formats.contains("action")
1946             && m->data("action") == "tab-reordering")
1947                 event->acceptProposedAction();
1948 }
1949
1950
1951 void DragTabBar::dropEvent(QDropEvent * event)
1952 {
1953         int fromIndex = tabAt(dragStartPos_);
1954         int toIndex = tabAt(event->pos());
1955
1956         // Tell interested objects that
1957         if (fromIndex != toIndex)
1958                 tabMoveRequested(fromIndex, toIndex);
1959         event->acceptProposedAction();
1960 }
1961
1962
1963 } // namespace frontend
1964 } // namespace lyx
1965
1966 #include "moc_GuiWorkArea.cpp"