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         setCursorShape(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 Qt::CursorShape GuiWorkArea::cursorShape() const
 324 {
 325         return viewport()->cursor().shape();
 326 }
 327
 328 void GuiWorkArea::setCursorShape(Qt::CursorShape shape)
 329 {
 330         viewport()->setCursor(shape);
 331 }
 332
 333 void GuiWorkArea::setGuiView(GuiView & gv)
 334 {
 335         lyx_view_ = &gv;
 336 }
 337
 338
 339 void GuiWorkArea::setBuffer(Buffer & buffer)
 340 {
 341         delete buffer_view_;
 342         buffer_view_ = new BufferView(buffer);
 343         buffer.workAreaManager().add(this);
 344
 345         // HACK: Prevents an additional redraw when the scrollbar pops up
 346         // which regularily happens on documents with more than one page.
 347         // The policy  should be set to "Qt::ScrollBarAsNeeded" soon.
 348         // Since we have no geometry information yet, we assume that
 349         // a document needs a scrollbar if there is more then four
 350         // paragraph in the outermost text.
 351         if (buffer.text().paragraphs().size() > 4)
 352                 setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
 353         QTimer::singleShot(50, this, SLOT(fixVerticalScrollBar()));
 354 }
 355
 356
 357 void GuiWorkArea::fixVerticalScrollBar()
 358 {
 359         if (!isFullScreen())
 360                 setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
 361 }
 362
 363
 364 void GuiWorkArea::close()
 365 {
 366         lyx_view_->removeWorkArea(this);
 367 }
 368
 369
 370 void GuiWorkArea::setFullScreen(bool full_screen)
 371 {
 372         buffer_view_->setFullScreen(full_screen);
 373         setFrameStyle(QFrame::NoFrame);
 374         if (full_screen) {
 375                 setFrameStyle(QFrame::NoFrame);
 376                 if (lyxrc.full_screen_scrollbar)
 377                         setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 378         } else
 379                 setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
 380 }
 381
 382
 383 BufferView & GuiWorkArea::bufferView()
 384 {
 385         return *buffer_view_;
 386 }
 387
 388
 389 BufferView const & GuiWorkArea::bufferView() const
 390 {
 391         return *buffer_view_;
 392 }
 393
 394
 395 void GuiWorkArea::stopBlinkingCursor()
 396 {
 397         cursor_timeout_.stop();
 398         hideCursor();
 399 }
 400
 401
 402 void GuiWorkArea::startBlinkingCursor()
 403 {
 404         // do not show the cursor if the view is busy
 405         if (view().busy())
 406                 return;
 407
 408         Point p;
 409         int h = 0;
 410         buffer_view_->cursorPosAndHeight(p, h);
 411         // Don't start blinking if the cursor isn't on screen.
 412         if (!buffer_view_->cursorInView(p, h))
 413                 return;
 414
 415         showCursor();
 416
 417         //we're not supposed to cache this value.
 418         int const time = QApplication::cursorFlashTime() / 2;
 419         if (time <= 0)
 420                 return;
 421         cursor_timeout_.setInterval(time);
 422         cursor_timeout_.start();
 423 }
 424
 425
 426 void GuiWorkArea::redraw(bool update_metrics)
 427 {
 428         if (!isVisible())
 429                 // No need to redraw in this case.
 430                 return;
 431
 432         // No need to do anything if this is the current view. The BufferView
 433         // metrics are already up to date.
 434         if (update_metrics || lyx_view_ != guiApp->currentView()
 435                 || lyx_view_->currentWorkArea() != this) {
 436                 // FIXME: it would be nice to optimize for the off-screen case.
 437                 buffer_view_->updateMetrics();
 438                 buffer_view_->cursor().fixIfBroken();
 439         }
 440
 441         // update cursor position, because otherwise it has to wait until
 442         // the blinking interval is over
 443         if (cursor_visible_) {
 444                 hideCursor();
 445                 showCursor();
 446         }
 447
 448         LYXERR(Debug::WORKAREA, "WorkArea::redraw screen");
 449         updateScreen();
 450         update(0, 0, viewport()->width(), viewport()->height());
 451
 452         /// \warning: scrollbar updating *must* be done after the BufferView is drawn
 453         /// because \c BufferView::updateScrollbar() is called in \c BufferView::draw().
 454         updateScrollbar();
 455         lyx_view_->updateStatusBar();
 456
 457         if (lyxerr.debugging(Debug::WORKAREA))
 458                 buffer_view_->coordCache().dump();
 459
 460         setReadOnly(buffer_view_->buffer().isReadonly());
 461 }
 462
 463
 464 void GuiWorkArea::processKeySym(KeySymbol const & key, KeyModifier mod)
 465 {
 466         if (lyx_view_->isFullScreen() && lyx_view_->menuBar()->isVisible()
 467                 && lyxrc.full_screen_menubar) {
 468                 // FIXME HACK: we should not have to do this here. See related comment
 469                 // in GuiView::event() (QEvent::ShortcutOverride)
 470                 lyx_view_->menuBar()->hide();
 471         }
 472
 473         // In order to avoid bad surprise in the middle of an operation,
 474         // we better stop the blinking cursor...
 475         // the cursor gets restarted in GuiView::restartCursor()
 476         stopBlinkingCursor();
 477         guiApp->processKeySym(key, mod);
 478 }
 479
 480
 481 void GuiWorkArea::dispatch(FuncRequest const & cmd0, KeyModifier mod)
 482 {
 483         // Handle drag&drop
 484         if (cmd0.action() == LFUN_FILE_OPEN) {
 485                 DispatchResult dr;
 486                 lyx_view_->dispatch(cmd0, dr);
 487                 return;
 488         }
 489
 490         FuncRequest cmd;
 491
 492         if (cmd0.action() == LFUN_MOUSE_PRESS) {
 493                 if (mod == ShiftModifier)
 494                         cmd = FuncRequest(cmd0, "region-select");
 495                 else if (mod == ControlModifier)
 496                         cmd = FuncRequest(cmd0, "paragraph-select");
 497                 else
 498                         cmd = cmd0;
 499         }
 500         else
 501                 cmd = cmd0;
 502
 503         bool const notJustMovingTheMouse =
 504                 cmd.action() != LFUN_MOUSE_MOTION || cmd.button() != mouse_button::none;
 505
 506         // In order to avoid bad surprise in the middle of an operation, we better stop
 507         // the blinking cursor.
 508         if (notJustMovingTheMouse)
 509                 stopBlinkingCursor();
 510
 511         buffer_view_->mouseEventDispatch(cmd);
 512
 513         // Skip these when selecting
 514         if (cmd.action() != LFUN_MOUSE_MOTION) {
 515                 completer_->updateVisibility(false, false);
 516                 lyx_view_->updateDialogs();
 517                 lyx_view_->updateStatusBar();
 518         }
 519
 520         // GUI tweaks except with mouse motion with no button pressed.
 521         if (notJustMovingTheMouse) {
 522                 // Slight hack: this is only called currently when we
 523                 // clicked somewhere, so we force through the display
 524                 // of the new status here.
 525                 lyx_view_->clearMessage();
 526
 527                 // Show the cursor immediately after any operation
 528                 startBlinkingCursor();
 529         }
 530
 531         setCursorShape(buffer_view_->clickableInset()
 532                 ? Qt::PointingHandCursor : Qt::IBeamCursor);
 533 }
 534
 535
 536 void GuiWorkArea::resizeBufferView()
 537 {
 538         // WARNING: Please don't put any code that will trigger a repaint here!
 539         // We are already inside a paint event.
 540         lyx_view_->setBusy(true);
 541         Point p;
 542         int h = 0;
 543         buffer_view_->cursorPosAndHeight(p, h);
 544         bool const cursor_in_view = buffer_view_->cursorInView(p, h);
 545         buffer_view_->resize(viewport()->width(), viewport()->height());
 546         if (cursor_in_view)
 547                 buffer_view_->scrollToCursor();
 548         updateScreen();
 549
 550         // Update scrollbars which might have changed due different
 551         // BufferView dimension. This is especially important when the
 552         // BufferView goes from zero-size to the real-size for the first time,
 553         // as the scrollbar paramters are then set for the first time.
 554         updateScrollbar();
 555
 556         lyx_view_->updateLayoutList();
 557         lyx_view_->setBusy(false);
 558         need_resize_ = false;
 559 }
 560
 561
 562 void GuiWorkArea::showCursor()
 563 {
 564         if (cursor_visible_)
 565                 return;
 566
 567         Point p;
 568         int h = 0;
 569         buffer_view_->cursorPosAndHeight(p, h);
 570         if (!buffer_view_->cursorInView(p, h))
 571                 return;
 572
 573         // RTL or not RTL
 574         bool l_shape = false;
 575         Font const & realfont = buffer_view_->cursor().real_current_font;
 576         BufferParams const & bp = buffer_view_->buffer().params();
 577         bool const samelang = realfont.language() == bp.language;
 578         bool const isrtl = realfont.isVisibleRightToLeft();
 579
 580         if (!samelang || isrtl != bp.language->rightToLeft())
 581                 l_shape = true;
 582
 583         // The ERT language hack needs fixing up
 584         if (realfont.language() == latex_language)
 585                 l_shape = false;
 586
 587         // show cursor on screen
 588         Cursor & cur = buffer_view_->cursor();
 589         bool completable = cur.inset().showCompletionCursor()
 590                 && completer_->completionAvailable()
 591                 && !completer_->popupVisible()
 592                 && !completer_->inlineVisible();
 593         cursor_visible_ = true;
 594         showCursor(p.x_, p.y_, h, l_shape, isrtl, completable);
 595 }
 596
 597
 598 void GuiWorkArea::hideCursor()
 599 {
 600         if (!cursor_visible_)
 601                 return;
 602
 603         cursor_visible_ = false;
 604         removeCursor();
 605 }
 606
 607
 608 void GuiWorkArea::toggleCursor()
 609 {
 610         if (cursor_visible_)
 611                 hideCursor();
 612         else
 613                 showCursor();
 614 }
 615
 616
 617 void GuiWorkArea::updateScrollbar()
 618 {
 619         ScrollbarParameters const & scroll_ = buffer_view_->scrollbarParameters();
 620         // WARNING: don't touch at the scrollbar value like this:
 621         //   verticalScrollBar()->setValue(scroll_.position);
 622         // because this would cause a recursive signal/slot calling with
 623         // GuiWorkArea::scrollTo
 624         verticalScrollBar()->setRange(scroll_.min, scroll_.max);
 625         verticalScrollBar()->setPageStep(scroll_.page_step);
 626         verticalScrollBar()->setSingleStep(scroll_.single_step);
 627         verticalScrollBar()->setSliderPosition(scroll_.position);
 628 }
 629
 630
 631 void GuiWorkArea::scrollTo(int value)
 632 {
 633         stopBlinkingCursor();
 634         buffer_view_->scrollDocView(value, true);
 635
 636         if (lyxrc.cursor_follows_scrollbar) {
 637                 buffer_view_->setCursorFromScrollbar();
 638                 lyx_view_->updateLayoutList();
 639         }
 640         // Show the cursor immediately after any operation.
 641         startBlinkingCursor();
 642         QApplication::syncX();
 643 }
 644
 645
 646 bool GuiWorkArea::event(QEvent * e)
 647 {
 648         switch (e->type()) {
 649         case QEvent::ToolTip: {
 650                 QHelpEvent * helpEvent = static_cast<QHelpEvent *>(e);
 651                 if (lyxrc.use_tooltip) {
 652                         QPoint pos = helpEvent->pos();
 653                         if (pos.x() < viewport()->width()) {
 654                                 QString s = toqstr(buffer_view_->toolTip(pos.x(), pos.y()));
 655                                 QToolTip::showText(helpEvent->globalPos(), s);
 656                         }
 657                         else
 658                                 QToolTip::hideText();
 659                 }
 660                 // Don't forget to accept the event!
 661                 e->accept();
 662                 return true;
 663         }
 664
 665         case QEvent::ShortcutOverride: {
 666                 // We catch this event in order to catch the Tab or Shift+Tab key press
 667                 // which are otherwise reserved to focus switching between controls
 668                 // within a dialog.
 669                 QKeyEvent * ke = static_cast<QKeyEvent*>(e);
 670                 if ((ke->key() == Qt::Key_Tab && ke->modifiers() == Qt::NoModifier)
 671                         || (ke->key() == Qt::Key_Backtab && (
 672                                 ke->modifiers() == Qt::ShiftModifier
 673                                 || ke->modifiers() == Qt::NoModifier))) {
 674                         keyPressEvent(ke);
 675                         return true;
 676                 }
 677                 return QAbstractScrollArea::event(e);
 678         }
 679
 680         default:
 681                 return QAbstractScrollArea::event(e);
 682         }
 683         return false;
 684 }
 685
 686
 687 void GuiWorkArea::contextMenuEvent(QContextMenuEvent * e)
 688 {
 689         QPoint pos;
 690         if (e->reason() == QContextMenuEvent::Mouse)
 691                 // the position is set on mouse press
 692                 pos = context_target_pos_;
 693         else
 694                 pos = e->pos();
 695         Cursor const & cur = buffer_view_->cursor();
 696         if (e->reason() == QContextMenuEvent::Keyboard && cur.inTexted()) {
 697                 // Do not access the context menu of math right in front of before
 698                 // the cursor. This does not work when the cursor is in text.
 699                 Inset * inset = cur.paragraph().getInset(cur.pos());
 700                 if (inset && inset->asInsetMath())
 701                         --pos.rx();
 702                 else if (cur.pos() > 0) {
 703                         Inset * inset = cur.paragraph().getInset(cur.pos() - 1);
 704                         if (inset)
 705                                 ++pos.rx();
 706                 }
 707         }
 708         docstring name = buffer_view_->contextMenu(pos.x(), pos.y());
 709         if (name.empty()) {
 710                 QAbstractScrollArea::contextMenuEvent(e);
 711                 return;
 712         }
 713         QMenu * menu = guiApp->menus().menu(toqstr(name), *lyx_view_);
 714         if (!menu) {
 715                 QAbstractScrollArea::contextMenuEvent(e);
 716                 return;
 717         }
 718         // Position the menu to the right.
 719         // FIXME: menu position should be different for RTL text.
 720         menu->exec(e->globalPos());
 721         e->accept();
 722 }
 723
 724
 725 void GuiWorkArea::focusInEvent(QFocusEvent * e)
 726 {
 727         LYXERR(Debug::DEBUG, "GuiWorkArea::focusInEvent(): " << this << endl);
 728         if (lyx_view_->currentWorkArea() != this)
 729                 lyx_view_->setCurrentWorkArea(this);
 730
 731         startBlinkingCursor();
 732         QAbstractScrollArea::focusInEvent(e);
 733 }
 734
 735
 736 void GuiWorkArea::focusOutEvent(QFocusEvent * e)
 737 {
 738         LYXERR(Debug::DEBUG, "GuiWorkArea::focusOutEvent(): " << this << endl);
 739         stopBlinkingCursor();
 740         QAbstractScrollArea::focusOutEvent(e);
 741 }
 742
 743
 744 void GuiWorkArea::mousePressEvent(QMouseEvent * e)
 745 {
 746         if (dc_event_.active && dc_event_ == *e) {
 747                 dc_event_.active = false;
 748                 FuncRequest cmd(LFUN_MOUSE_TRIPLE, e->x(), e->y(),
 749                         q_button_state(e->button()));
 750                 dispatch(cmd);
 751                 e->accept();
 752                 return;
 753         }
 754
 755         if (e->button() == Qt::RightButton)
 756                 context_target_pos_ = e->pos();
 757
 758         inputContext()->reset();
 759
 760         FuncRequest const cmd(LFUN_MOUSE_PRESS, e->x(), e->y(),
 761                 q_button_state(e->button()));
 762         dispatch(cmd, q_key_state(e->modifiers()));
 763         e->accept();
 764 }
 765
 766
 767 void GuiWorkArea::mouseReleaseEvent(QMouseEvent * e)
 768 {
 769         if (synthetic_mouse_event_.timeout.running())
 770                 synthetic_mouse_event_.timeout.stop();
 771
 772         FuncRequest const cmd(LFUN_MOUSE_RELEASE, e->x(), e->y(),
 773                               q_button_state(e->button()));
 774         dispatch(cmd);
 775         e->accept();
 776 }
 777
 778
 779 void GuiWorkArea::mouseMoveEvent(QMouseEvent * e)
 780 {
 781         // we kill the triple click if we move
 782         doubleClickTimeout();
 783         FuncRequest cmd(LFUN_MOUSE_MOTION, e->x(), e->y(),
 784                 q_motion_state(e->buttons()));
 785
 786         e->accept();
 787
 788         // If we're above or below the work area...
 789         if ((e->y() <= 20 || e->y() >= viewport()->height() - 20)
 790                         && e->buttons() == mouse_button::button1) {
 791                 // Make sure only a synthetic event can cause a page scroll,
 792                 // so they come at a steady rate:
 793                 if (e->y() <= 20)
 794                         // _Force_ a scroll up:
 795                         cmd.set_y(e->y() - 21);
 796                 else
 797                         cmd.set_y(e->y() + 21);
 798                 // Store the event, to be handled when the timeout expires.
 799                 synthetic_mouse_event_.cmd = cmd;
 800
 801                 if (synthetic_mouse_event_.timeout.running()) {
 802                         // Discard the event. Note that it _may_ be handled
 803                         // when the timeout expires if
 804                         // synthetic_mouse_event_.cmd has not been overwritten.
 805                         // Ie, when the timeout expires, we handle the
 806                         // most recent event but discard all others that
 807                         // occurred after the one used to start the timeout
 808                         // in the first place.
 809                         return;
 810                 }
 811
 812                 synthetic_mouse_event_.restart_timeout = true;
 813                 synthetic_mouse_event_.timeout.start();
 814                 // Fall through to handle this event...
 815
 816         } else if (synthetic_mouse_event_.timeout.running()) {
 817                 // Store the event, to be possibly handled when the timeout
 818                 // expires.
 819                 // Once the timeout has expired, normal control is returned
 820                 // to mouseMoveEvent (restart_timeout = false).
 821                 // This results in a much smoother 'feel' when moving the
 822                 // mouse back into the work area.
 823                 synthetic_mouse_event_.cmd = cmd;
 824                 synthetic_mouse_event_.restart_timeout = false;
 825                 return;
 826         }
 827         dispatch(cmd);
 828 }
 829
 830
 831 void GuiWorkArea::wheelEvent(QWheelEvent * ev)
 832 {
 833         // Wheel rotation by one notch results in a delta() of 120 (see
 834         // documentation of QWheelEvent)
 835         double const delta = ev->delta() / 120.0;
 836         bool zoom = false;
 837         switch (lyxrc.scroll_wheel_zoom) {
 838         case LyXRC::SCROLL_WHEEL_ZOOM_CTRL:
 839                 zoom = ev->modifiers() & Qt::ControlModifier;
 840                 zoom &= !(ev->modifiers() & (Qt::ShiftModifier | Qt::AltModifier));
 841                 break;
 842         case LyXRC::SCROLL_WHEEL_ZOOM_SHIFT:
 843                 zoom = ev->modifiers() & Qt::ShiftModifier;
 844                 zoom &= !(ev->modifiers() & (Qt::ControlModifier | Qt::AltModifier));
 845                 break;
 846         case LyXRC::SCROLL_WHEEL_ZOOM_ALT:
 847                 zoom = ev->modifiers() & Qt::AltModifier;
 848                 zoom &= !(ev->modifiers() & (Qt::ShiftModifier | Qt::ControlModifier));
 849                 break;
 850         case LyXRC::SCROLL_WHEEL_ZOOM_OFF:
 851                 break;
 852         }
 853         if (zoom) {
 854                 docstring arg = convert<docstring>(int(5 * delta));
 855                 lyx::dispatch(FuncRequest(LFUN_BUFFER_ZOOM_IN, arg));
 856                 return;
 857         }
 858
 859         // Take into account the desktop wide settings.
 860         int const lines = qApp->wheelScrollLines();
 861         int const page_step = verticalScrollBar()->pageStep();
 862         // Test if the wheel mouse is set to one screen at a time.
 863         int scroll_value = lines > page_step
 864                 ? page_step : lines * verticalScrollBar()->singleStep();
 865
 866         // Take into account the rotation and the user preferences.
 867         scroll_value = int(scroll_value * delta * lyxrc.mouse_wheel_speed);
 868         LYXERR(Debug::SCROLLING, "wheelScrollLines = " << lines
 869                         << " delta = " << delta << " scroll_value = " << scroll_value
 870                         << " page_step = " << page_step);
 871         // Now scroll.
 872         verticalScrollBar()->setValue(verticalScrollBar()->value() - scroll_value);
 873
 874         ev->accept();
 875 }
 876
 877
 878 void GuiWorkArea::generateSyntheticMouseEvent()
 879 {
 880         int const e_y = synthetic_mouse_event_.cmd.y();
 881         int const wh = buffer_view_->workHeight();
 882         bool const up = e_y < 0;
 883         bool const down = e_y > wh;
 884
 885         // Set things off to generate the _next_ 'pseudo' event.
 886         int step = 50;
 887         if (synthetic_mouse_event_.restart_timeout) {
 888                 // This is some magic formulae to determine the speed
 889                 // of scrolling related to the position of the mouse.
 890                 int time = 200;
 891                 if (up || down) {
 892                         int dist = up ? -e_y : e_y - wh;
 893                         time = max(min(200, 250000 / (dist * dist)), 1) ;
 894
 895                         if (time < 40) {
 896                                 step = 80000 / (time * time);
 897                                 time = 40;
 898                         }
 899                 }
 900                 synthetic_mouse_event_.timeout.setTimeout(time);
 901                 synthetic_mouse_event_.timeout.start();
 902         }
 903
 904         // Can we scroll further ?
 905         int const value = verticalScrollBar()->value();
 906         if (value == verticalScrollBar()->maximum()
 907                   || value == verticalScrollBar()->minimum()) {
 908                 synthetic_mouse_event_.timeout.stop();
 909                 return;
 910         }
 911
 912         // Scroll
 913         if (step <= 2 * wh) {
 914                 buffer_view_->scroll(up ? -step : step);
 915                 buffer_view_->updateMetrics();
 916         } else {
 917                 buffer_view_->scrollDocView(value + up ? -step : step, false);
 918         }
 919
 920         // In which paragraph do we have to set the cursor ?
 921         Cursor & cur = buffer_view_->cursor();
 922         TextMetrics const & tm = buffer_view_->textMetrics(cur.text());
 923
 924         pair<pit_type, const ParagraphMetrics *> p = up ? tm.first() : tm.last();
 925         ParagraphMetrics const & pm = *p.second;
 926         pit_type const pit = p.first;
 927
 928         if (pm.rows().empty())
 929                 return;
 930
 931         // Find the row at which we set the cursor.
 932         RowList::const_iterator rit = pm.rows().begin();
 933         RowList::const_iterator rlast = pm.rows().end();
 934         int yy = pm.position() - pm.ascent();
 935         for (--rlast; rit != rlast; ++rit) {
 936                 int h = rit->height();
 937                 if ((up && yy + h > 0)
 938                           || (!up && yy + h > wh - defaultRowHeight()))
 939                         break;
 940                 yy += h;
 941         }
 942
 943         // Find the position of the cursor
 944         bool bound;
 945         int x = synthetic_mouse_event_.cmd.x();
 946         pos_type const pos = rit->pos() + tm.getColumnNearX(pit, *rit, x, bound);
 947
 948         // Set the cursor
 949         cur.pit() = pit;
 950         cur.pos() = pos;
 951         cur.boundary(bound);
 952
 953         buffer_view_->buffer().changed(false);
 954         return;
 955 }
 956
 957
 958 void GuiWorkArea::keyPressEvent(QKeyEvent * ev)
 959 {
 960         // Do not process here some keys if dialog_mode_ is set
 961         if (dialog_mode_
 962                 && (ev->modifiers() == Qt::NoModifier
 963                     || ev->modifiers() == Qt::ShiftModifier)
 964                 && (ev->key() == Qt::Key_Escape
 965                     || ev->key() == Qt::Key_Enter
 966                     || ev->key() == Qt::Key_Return)
 967             ) {
 968                 ev->ignore();
 969                 return;
 970         }
 971
 972         // intercept some keys if completion popup is visible
 973         if (completer_->popupVisible()) {
 974                 switch (ev->key()) {
 975                 case Qt::Key_Enter:
 976                 case Qt::Key_Return:
 977                         completer_->activate();
 978                         ev->accept();
 979                         return;
 980                 }
 981         }
 982
 983         // do nothing if there are other events
 984         // (the auto repeated events come too fast)
 985         // it looks like this is only needed on X11
 986 #ifdef Q_WS_X11
 987         if (qApp->hasPendingEvents() && ev->isAutoRepeat()) {
 988                 LYXERR(Debug::KEY, "system is busy: keyPress event ignored");
 989                 ev->ignore();
 990                 return;
 991         }
 992 #endif
 993
 994         LYXERR(Debug::KEY, " count: " << ev->count() << " text: " << ev->text()
 995                 << " isAutoRepeat: " << ev->isAutoRepeat() << " key: " << ev->key());
 996
 997         KeySymbol sym;
 998         setKeySymbol(&sym, ev);
 999         if (sym.isOK()) {
1000                 processKeySym(sym, q_key_state(ev->modifiers()));
1001                 ev->accept();
1002         } else {
1003                 ev->ignore();
1004         }
1005 }
1006
1007
1008 void GuiWorkArea::doubleClickTimeout()
1009 {
1010         dc_event_.active = false;
1011 }
1012
1013
1014 void GuiWorkArea::mouseDoubleClickEvent(QMouseEvent * ev)
1015 {
1016         dc_event_ = DoubleClick(ev);
1017         QTimer::singleShot(QApplication::doubleClickInterval(), this,
1018                            SLOT(doubleClickTimeout()));
1019         FuncRequest cmd(LFUN_MOUSE_DOUBLE,
1020                         ev->x(), ev->y(),
1021                         q_button_state(ev->button()));
1022         dispatch(cmd);
1023         ev->accept();
1024 }
1025
1026
1027 void GuiWorkArea::resizeEvent(QResizeEvent * ev)
1028 {
1029         QAbstractScrollArea::resizeEvent(ev);
1030         need_resize_ = true;
1031         ev->accept();
1032 }
1033
1034
1035 void GuiWorkArea::update(int x, int y, int w, int h)
1036 {
1037         viewport()->repaint(x, y, w, h);
1038 }
1039
1040
1041 void GuiWorkArea::paintEvent(QPaintEvent * ev)
1042 {
1043         QRect const rc = ev->rect();
1044         // LYXERR(Debug::PAINTING, "paintEvent begin: x: " << rc.x()
1045         //      << " y: " << rc.y() << " w: " << rc.width() << " h: " << rc.height());
1046
1047         if (need_resize_) {
1048                 screen_ = QPixmap(viewport()->width(), viewport()->height());
1049                 resizeBufferView();
1050                 if (cursor_visible_) {
1051                         hideCursor();
1052                         showCursor();
1053                 }
1054         }
1055
1056         QPainter pain(viewport());
1057         pain.drawPixmap(rc, screen_, rc);
1058         cursor_->draw(pain);
1059         ev->accept();
1060 }
1061
1062
1063 void GuiWorkArea::updateScreen()
1064 {
1065         GuiPainter pain(&screen_);
1066         buffer_view_->draw(pain);
1067 }
1068
1069
1070 void GuiWorkArea::showCursor(int x, int y, int h,
1071         bool l_shape, bool rtl, bool completable)
1072 {
1073         if (schedule_redraw_) {
1074                 // This happens when a graphic conversion is finished. As we don't know
1075                 // the size of the new graphics, it's better the update everything.
1076                 // We can't use redraw() here because this would trigger a infinite
1077                 // recursive loop with showCursor().
1078                 buffer_view_->resize(viewport()->width(), viewport()->height());
1079                 updateScreen();
1080                 updateScrollbar();
1081                 viewport()->update(QRect(0, 0, viewport()->width(), viewport()->height()));
1082                 schedule_redraw_ = false;
1083                 // Show the cursor immediately after the update.
1084                 hideCursor();
1085                 toggleCursor();
1086                 return;
1087         }
1088
1089         cursor_->update(x, y, h, l_shape, rtl, completable);
1090         cursor_->show();
1091         viewport()->update(cursor_->rect());
1092 }
1093
1094
1095 void GuiWorkArea::removeCursor()
1096 {
1097         cursor_->hide();
1098         //if (!qApp->focusWidget())
1099                 viewport()->update(cursor_->rect());
1100 }
1101
1102
1103 void GuiWorkArea::inputMethodEvent(QInputMethodEvent * e)
1104 {
1105         QString const & commit_string = e->commitString();
1106         docstring const & preedit_string
1107                 = qstring_to_ucs4(e->preeditString());
1108
1109         if (!commit_string.isEmpty()) {
1110
1111                 LYXERR(Debug::KEY, "preeditString: " << e->preeditString()
1112                         << " commitString: " << e->commitString());
1113
1114                 int key = 0;
1115
1116                 // FIXME Iwami 04/01/07: we should take care also of UTF16 surrogates here.
1117                 for (int i = 0; i != commit_string.size(); ++i) {
1118                         QKeyEvent ev(QEvent::KeyPress, key, Qt::NoModifier, commit_string[i]);
1119                         keyPressEvent(&ev);
1120                 }
1121         }
1122
1123         // Hide the cursor during the kana-kanji transformation.
1124         if (preedit_string.empty())
1125                 startBlinkingCursor();
1126         else
1127                 stopBlinkingCursor();
1128
1129         // last_width : for checking if last preedit string was/wasn't empty.
1130         static bool last_width = false;
1131         if (!last_width && preedit_string.empty()) {
1132                 // if last_width is last length of preedit string.
1133                 e->accept();
1134                 return;
1135         }
1136
1137         GuiPainter pain(&screen_);
1138         buffer_view_->updateMetrics();
1139         buffer_view_->draw(pain);
1140         FontInfo font = buffer_view_->cursor().getFont().fontInfo();
1141         FontMetrics const & fm = theFontMetrics(font);
1142         int height = fm.maxHeight();
1143         int cur_x = cursor_->rect().left();
1144         int cur_y = cursor_->rect().bottom();
1145
1146         // redraw area of preedit string.
1147         update(0, cur_y - height, viewport()->width(),
1148                 (height + 1) * preedit_lines_);
1149
1150         if (preedit_string.empty()) {
1151                 last_width = false;
1152                 preedit_lines_ = 1;
1153                 e->accept();
1154                 return;
1155         }
1156         last_width = true;
1157
1158         // att : stores an IM attribute.
1159         QList<QInputMethodEvent::Attribute> const & att = e->attributes();
1160
1161         // get attributes of input method cursor.
1162         // cursor_pos : cursor position in preedit string.
1163         size_t cursor_pos = 0;
1164         bool cursor_is_visible = false;
1165         for (int i = 0; i != att.size(); ++i) {
1166                 if (att.at(i).type == QInputMethodEvent::Cursor) {
1167                         cursor_pos = att.at(i).start;
1168                         cursor_is_visible = att.at(i).length != 0;
1169                         break;
1170                 }
1171         }
1172
1173         size_t preedit_length = preedit_string.length();
1174
1175         // get position of selection in input method.
1176         // FIXME: isn't there a way to do this simplier?
1177         // rStart : cursor position in selected string in IM.
1178         size_t rStart = 0;
1179         // rLength : selected string length in IM.
1180         size_t rLength = 0;
1181         if (cursor_pos < preedit_length) {
1182                 for (int i = 0; i != att.size(); ++i) {
1183                         if (att.at(i).type == QInputMethodEvent::TextFormat) {
1184                                 if (att.at(i).start <= int(cursor_pos)
1185                                         && int(cursor_pos) < att.at(i).start + att.at(i).length) {
1186                                                 rStart = att.at(i).start;
1187                                                 rLength = att.at(i).length;
1188                                                 if (!cursor_is_visible)
1189                                                         cursor_pos += rLength;
1190                                                 break;
1191                                 }
1192                         }
1193                 }
1194         }
1195         else {
1196                 rStart = cursor_pos;
1197                 rLength = 0;
1198         }
1199
1200         int const right_margin = buffer_view_->rightMargin();
1201         Painter::preedit_style ps;
1202         // Most often there would be only one line:
1203         preedit_lines_ = 1;
1204         for (size_t pos = 0; pos != preedit_length; ++pos) {
1205                 char_type const typed_char = preedit_string[pos];
1206                 // reset preedit string style
1207                 ps = Painter::preedit_default;
1208
1209                 // if we reached the right extremity of the screen, go to next line.
1210                 if (cur_x + fm.width(typed_char) > viewport()->width() - right_margin) {
1211                         cur_x = right_margin;
1212                         cur_y += height + 1;
1213                         ++preedit_lines_;
1214                 }
1215                 // preedit strings are displayed with dashed underline
1216                 // and partial strings are displayed white on black indicating
1217                 // that we are in selecting mode in the input method.
1218                 // FIXME: rLength == preedit_length is not a changing condition
1219                 // FIXME: should be put out of the loop.
1220                 if (pos >= rStart
1221                         && pos < rStart + rLength
1222                         && !(cursor_pos < rLength && rLength == preedit_length))
1223                         ps = Painter::preedit_selecting;
1224
1225                 if (pos == cursor_pos
1226                         && (cursor_pos < rLength && rLength == preedit_length))
1227                         ps = Painter::preedit_cursor;
1228
1229                 // draw one character and update cur_x.
1230                 cur_x += pain.preeditText(cur_x, cur_y, typed_char, font, ps);
1231         }
1232
1233         // update the preedit string screen area.
1234         update(0, cur_y - preedit_lines_*height, viewport()->width(),
1235                 (height + 1) * preedit_lines_);
1236
1237         // Don't forget to accept the event!
1238         e->accept();
1239 }
1240
1241
1242 QVariant GuiWorkArea::inputMethodQuery(Qt::InputMethodQuery query) const
1243 {
1244         QRect cur_r(0, 0, 0, 0);
1245         switch (query) {
1246                 // this is the CJK-specific composition window position and
1247                 // the context menu position when the menu key is pressed.
1248                 case Qt::ImMicroFocus:
1249                         cur_r = cursor_->rect();
1250                         if (preedit_lines_ != 1)
1251                                 cur_r.moveLeft(10);
1252                         cur_r.moveBottom(cur_r.bottom()
1253                                 + cur_r.height() * (preedit_lines_ - 1));
1254                         // return lower right of cursor in LyX.
1255                         return cur_r;
1256                 default:
1257                         return QWidget::inputMethodQuery(query);
1258         }
1259 }
1260
1261
1262 void GuiWorkArea::updateWindowTitle()
1263 {
1264         docstring maximize_title;
1265         docstring minimize_title;
1266
1267         Buffer & buf = buffer_view_->buffer();
1268         FileName const fileName = buf.fileName();
1269         if (!fileName.empty()) {
1270                 maximize_title = fileName.displayName(30);
1271                 minimize_title = from_utf8(fileName.onlyFileName());
1272                 if (buf.lyxvc().inUse()) {
1273                         if (buf.lyxvc().locking())
1274                                 maximize_title +=  _(" (version control, locking)");
1275                         else
1276                                 maximize_title +=  _(" (version control)");
1277                 }
1278                 if (!buf.isClean()) {
1279                         maximize_title += _(" (changed)");
1280                         minimize_title += char_type('*');
1281                 }
1282                 if (buf.isReadonly())
1283                         maximize_title += _(" (read only)");
1284         }
1285
1286         QString title = windowTitle();
1287         QString new_title = toqstr(maximize_title);
1288         if (title == new_title)
1289                 return;
1290
1291         QWidget::setWindowTitle(new_title);
1292         QWidget::setWindowIconText(toqstr(minimize_title));
1293         titleChanged(this);
1294 }
1295
1296
1297 void GuiWorkArea::setReadOnly(bool read_only)
1298 {
1299         if (read_only_ == read_only)
1300                 return;
1301         read_only_ = read_only;
1302         updateWindowTitle();
1303         if (this == lyx_view_->currentWorkArea())
1304                 lyx_view_->updateDialogs();
1305 }
1306
1307
1308 bool GuiWorkArea::isFullScreen()
1309 {
1310         return lyx_view_ && lyx_view_->isFullScreen();
1311 }
1312
1313
1314 ////////////////////////////////////////////////////////////////////
1315 //
1316 // EmbeddedWorkArea
1317 //
1318 ////////////////////////////////////////////////////////////////////
1319
1320
1321 EmbeddedWorkArea::EmbeddedWorkArea(QWidget * w): GuiWorkArea(w)
1322 {
1323         buffer_ = theBufferList().newBuffer(
1324                 support::FileName::tempName().absFileName() + "_embedded.internal");
1325         buffer_->setUnnamed(true);
1326         buffer_->setFullyLoaded(true);
1327         setBuffer(*buffer_);
1328         setDialogMode(true);
1329 }
1330
1331
1332 EmbeddedWorkArea::~EmbeddedWorkArea()
1333 {
1334         // No need to destroy buffer and bufferview here, because it is done
1335         // in theBufferList() destruction loop at application exit
1336 }
1337
1338
1339 void EmbeddedWorkArea::closeEvent(QCloseEvent * ev)
1340 {
1341         disable();
1342         GuiWorkArea::closeEvent(ev);
1343 }
1344
1345
1346 void EmbeddedWorkArea::hideEvent(QHideEvent * ev)
1347 {
1348         disable();
1349         GuiWorkArea::hideEvent(ev);
1350 }
1351
1352
1353 QSize EmbeddedWorkArea::sizeHint () const
1354 {
1355         // FIXME(?):
1356         // GuiWorkArea sets the size to the screen's viewport
1357         // by returning a value this gets overridden
1358         // EmbeddedWorkArea is now sized to fit in the layout
1359         // of the parent, and has a minimum size set in GuiWorkArea
1360         // which is what we return here
1361         return QSize(100, 70);
1362 }
1363
1364
1365 void EmbeddedWorkArea::disable()
1366 {
1367         stopBlinkingCursor();
1368         if (view().currentWorkArea() != this)
1369                 return;
1370         // No problem if currentMainWorkArea() is 0 (setCurrentWorkArea()
1371         // tolerates it and shows the background logo), what happens if
1372         // an EmbeddedWorkArea is closed after closing all document WAs
1373         view().setCurrentWorkArea(view().currentMainWorkArea());
1374 }
1375
1376 ////////////////////////////////////////////////////////////////////
1377 //
1378 // TabWorkArea
1379 //
1380 ////////////////////////////////////////////////////////////////////
1381
1382 #ifdef Q_WS_MACX
1383 class NoTabFrameMacStyle : public QMacStyle {
1384 public:
1385         ///
1386         QRect subElementRect(SubElement element, const QStyleOption * option,
1387                              const QWidget * widget = 0) const
1388         {
1389                 QRect rect = QMacStyle::subElementRect(element, option, widget);
1390                 bool noBar = static_cast<QTabWidget const *>(widget)->count() <= 1;
1391
1392                 // The Qt Mac style puts the contents into a 3 pixel wide box
1393                 // which looks very ugly and not like other Mac applications.
1394                 // Hence we remove this here, and moreover the 16 pixel round
1395                 // frame above if the tab bar is hidden.
1396                 if (element == QStyle::SE_TabWidgetTabContents) {
1397                         rect.adjust(- rect.left(), 0, rect.left(), 0);
1398                         if (noBar)
1399                                 rect.setTop(0);
1400                 }
1401
1402                 return rect;
1403         }
1404 };
1405
1406 NoTabFrameMacStyle noTabFrameMacStyle;
1407 #endif
1408
1409
1410 TabWorkArea::TabWorkArea(QWidget * parent)
1411         : QTabWidget(parent), clicked_tab_(-1)
1412 {
1413 #ifdef Q_WS_MACX
1414         setStyle(&noTabFrameMacStyle);
1415 #endif
1416 #if QT_VERSION < 0x040500
1417         lyxrc.single_close_tab_button = true;
1418 #endif
1419
1420         QPalette pal = palette();
1421         pal.setColor(QPalette::Active, QPalette::Button,
1422                 pal.color(QPalette::Active, QPalette::Window));
1423         pal.setColor(QPalette::Disabled, QPalette::Button,
1424                 pal.color(QPalette::Disabled, QPalette::Window));
1425         pal.setColor(QPalette::Inactive, QPalette::Button,
1426                 pal.color(QPalette::Inactive, QPalette::Window));
1427
1428         QObject::connect(this, SIGNAL(currentChanged(int)),
1429                 this, SLOT(on_currentTabChanged(int)));
1430
1431         closeBufferButton = new QToolButton(this);
1432         closeBufferButton->setPalette(pal);
1433         // FIXME: rename the icon to closebuffer.png
1434         closeBufferButton->setIcon(QIcon(getPixmap("images/", "closetab", "png")));
1435         closeBufferButton->setText("Close File");
1436         closeBufferButton->setAutoRaise(true);
1437         closeBufferButton->setCursor(Qt::ArrowCursor);
1438         closeBufferButton->setToolTip(qt_("Close File"));
1439         closeBufferButton->setEnabled(true);
1440         QObject::connect(closeBufferButton, SIGNAL(clicked()),
1441                 this, SLOT(closeCurrentBuffer()));
1442         setCornerWidget(closeBufferButton, Qt::TopRightCorner);
1443
1444         // setup drag'n'drop
1445         QTabBar* tb = new DragTabBar;
1446         connect(tb, SIGNAL(tabMoveRequested(int, int)),
1447                 this, SLOT(moveTab(int, int)));
1448         tb->setElideMode(Qt::ElideNone);
1449         setTabBar(tb);
1450
1451         // make us responsible for the context menu of the tabbar
1452         tb->setContextMenuPolicy(Qt::CustomContextMenu);
1453         connect(tb, SIGNAL(customContextMenuRequested(const QPoint &)),
1454                 this, SLOT(showContextMenu(const QPoint &)));
1455 #if QT_VERSION >= 0x040500
1456         connect(tb, SIGNAL(tabCloseRequested(int)),
1457                 this, SLOT(closeTab(int)));
1458 #endif
1459
1460         setUsesScrollButtons(true);
1461 }
1462
1463
1464 void TabWorkArea::mouseDoubleClickEvent(QMouseEvent * event)
1465 {
1466         if (event->button() != Qt::LeftButton)
1467                 return;
1468
1469         // return early if double click on existing tabs
1470         for (int i = 0; i < count(); ++i)
1471                 if (tabBar()->tabRect(i).contains(event->pos()))
1472                         return;
1473
1474         dispatch(FuncRequest(LFUN_BUFFER_NEW));
1475 }
1476
1477
1478 void TabWorkArea::setFullScreen(bool full_screen)
1479 {
1480         for (int i = 0; i != count(); ++i) {
1481                 if (GuiWorkArea * wa = workArea(i))
1482                         wa->setFullScreen(full_screen);
1483         }
1484
1485         if (lyxrc.full_screen_tabbar)
1486                 showBar(!full_screen && count() > 1);
1487 }
1488
1489
1490 void TabWorkArea::showBar(bool show)
1491 {
1492         tabBar()->setEnabled(show);
1493         tabBar()->setVisible(show);
1494         closeBufferButton->setVisible(show && lyxrc.single_close_tab_button);
1495 #if QT_VERSION >= 0x040500
1496         setTabsClosable(!lyxrc.single_close_tab_button);
1497 #endif
1498 }
1499
1500
1501 GuiWorkArea * TabWorkArea::currentWorkArea()
1502 {
1503         if (count() == 0)
1504                 return 0;
1505
1506         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(currentWidget());
1507         LASSERT(wa, /**/);
1508         return wa;
1509 }
1510
1511
1512 GuiWorkArea * TabWorkArea::workArea(int index)
1513 {
1514         return dynamic_cast<GuiWorkArea *>(widget(index));
1515 }
1516
1517
1518 GuiWorkArea * TabWorkArea::workArea(Buffer & buffer)
1519 {
1520         // FIXME: this method doesn't work if we have more than work area
1521         // showing the same buffer.
1522         for (int i = 0; i != count(); ++i) {
1523                 GuiWorkArea * wa = workArea(i);
1524                 LASSERT(wa, return 0);
1525                 if (&wa->bufferView().buffer() == &buffer)
1526                         return wa;
1527         }
1528         return 0;
1529 }
1530
1531
1532 void TabWorkArea::closeAll()
1533 {
1534         while (count()) {
1535                 GuiWorkArea * wa = workArea(0);
1536                 LASSERT(wa, /**/);
1537                 removeTab(0);
1538                 delete wa;
1539         }
1540 }
1541
1542
1543 bool TabWorkArea::setCurrentWorkArea(GuiWorkArea * work_area)
1544 {
1545         LASSERT(work_area, /**/);
1546         int index = indexOf(work_area);
1547         if (index == -1)
1548                 return false;
1549
1550         if (index == currentIndex())
1551                 // Make sure the work area is up to date.
1552                 on_currentTabChanged(index);
1553         else
1554                 // Switch to the work area.
1555                 setCurrentIndex(index);
1556         work_area->setFocus();
1557
1558         return true;
1559 }
1560
1561
1562 GuiWorkArea * TabWorkArea::addWorkArea(Buffer & buffer, GuiView & view)
1563 {
1564         GuiWorkArea * wa = new GuiWorkArea(buffer, view);
1565         wa->setUpdatesEnabled(false);
1566         // Hide tabbar if there's no tab (avoid a resize and a flashing tabbar
1567         // when hiding it again below).
1568         if (!(currentWorkArea() && currentWorkArea()->isFullScreen()))
1569                 showBar(count() > 0);
1570         addTab(wa, wa->windowTitle());
1571         QObject::connect(wa, SIGNAL(titleChanged(GuiWorkArea *)),
1572                 this, SLOT(updateTabTexts()));
1573         if (currentWorkArea() && currentWorkArea()->isFullScreen())
1574                 setFullScreen(true);
1575         else
1576                 // Hide tabbar if there's only one tab.
1577                 showBar(count() > 1);
1578
1579         updateTabTexts();
1580
1581         return wa;
1582 }
1583
1584
1585 bool TabWorkArea::removeWorkArea(GuiWorkArea * work_area)
1586 {
1587         LASSERT(work_area, return false);
1588         int index = indexOf(work_area);
1589         if (index == -1)
1590                 return false;
1591
1592         work_area->setUpdatesEnabled(false);
1593         removeTab(index);
1594         delete work_area;
1595
1596         if (count()) {
1597                 // make sure the next work area is enabled.
1598                 currentWidget()->setUpdatesEnabled(true);
1599                 if (currentWorkArea() && currentWorkArea()->isFullScreen())
1600                         setFullScreen(true);
1601                 else
1602                         // Show tabbar only if there's more than one tab.
1603                         showBar(count() > 1);
1604         } else
1605                 lastWorkAreaRemoved();
1606
1607         updateTabTexts();
1608
1609         return true;
1610 }
1611
1612
1613 void TabWorkArea::on_currentTabChanged(int i)
1614 {
1615         // returns e.g. on application destruction
1616         if (i == -1)
1617                 return;
1618         GuiWorkArea * wa = workArea(i);
1619         LASSERT(wa, return);
1620         wa->setUpdatesEnabled(true);
1621         wa->redraw(true);
1622         wa->setFocus();
1623         ///
1624         currentWorkAreaChanged(wa);
1625
1626         LYXERR(Debug::GUI, "currentTabChanged " << i
1627                 << " File: " << wa->bufferView().buffer().absFileName());
1628 }
1629
1630
1631 void TabWorkArea::closeCurrentBuffer()
1632 {
1633         GuiWorkArea * wa;
1634         if (clicked_tab_ == -1)
1635                 wa = currentWorkArea();
1636         else {
1637                 wa = workArea(clicked_tab_);
1638                 LASSERT(wa, /**/);
1639         }
1640         wa->view().closeWorkArea(wa);
1641 }
1642
1643
1644 void TabWorkArea::hideCurrentTab()
1645 {
1646         GuiWorkArea * wa;
1647         if (clicked_tab_ == -1)
1648                 wa = currentWorkArea();
1649         else {
1650                 wa = workArea(clicked_tab_);
1651                 LASSERT(wa, /**/);
1652         }
1653         wa->view().hideWorkArea(wa);
1654 }
1655
1656
1657 void TabWorkArea::closeTab(int index)
1658 {
1659         on_currentTabChanged(index);
1660         GuiWorkArea * wa;
1661         if (index == -1)
1662                 wa = currentWorkArea();
1663         else {
1664                 wa = workArea(index);
1665                 LASSERT(wa, /**/);
1666         }
1667         wa->view().closeWorkArea(wa);
1668 }
1669
1670
1671 ///
1672 class DisplayPath {
1673 public:
1674         /// make vector happy
1675         DisplayPath() {}
1676         ///
1677         DisplayPath(int tab, FileName const & filename)
1678                 : tab_(tab)
1679         {
1680                 filename_ = (filename.extension() == "lyx") ?
1681                         toqstr(filename.onlyFileNameWithoutExt())
1682                         : toqstr(filename.onlyFileName());
1683                 postfix_ = toqstr(filename.absoluteFilePath()).
1684                         split("/", QString::SkipEmptyParts);
1685                 postfix_.pop_back();
1686                 abs_ = toqstr(filename.absoluteFilePath());
1687                 dottedPrefix_ = false;
1688         }
1689
1690         /// Absolute path for debugging.
1691         QString abs() const
1692         {
1693                 return abs_;
1694         }
1695         /// Add the first segment from the postfix or three dots to the prefix.
1696         /// Merge multiple dot tripples. In fact dots are added lazily, i.e. only
1697         /// when really needed.
1698         void shiftPathSegment(bool dotted)
1699         {
1700                 if (postfix_.count() <= 0)
1701                         return;
1702
1703                 if (!dotted) {
1704                         if (dottedPrefix_ && !prefix_.isEmpty())
1705                                 prefix_ += ".../";
1706                         prefix_ += postfix_.front() + "/";
1707                 }
1708                 dottedPrefix_ = dotted && !prefix_.isEmpty();
1709                 postfix_.pop_front();
1710         }
1711         ///
1712         QString displayString() const
1713         {
1714                 if (prefix_.isEmpty())
1715                         return filename_;
1716
1717                 bool dots = dottedPrefix_ || !postfix_.isEmpty();
1718                 return prefix_ + (dots ? ".../" : "") + filename_;
1719         }
1720         ///
1721         QString forecastPathString() const
1722         {
1723                 if (postfix_.count() == 0)
1724                         return displayString();
1725
1726                 return prefix_
1727                         + (dottedPrefix_ ? ".../" : "")
1728                         + postfix_.front() + "/";
1729         }
1730         ///
1731         bool final() const { return postfix_.empty(); }
1732         ///
1733         int tab() const { return tab_; }
1734
1735 private:
1736         ///
1737         QString prefix_;
1738         ///
1739         QStringList postfix_;
1740         ///
1741         QString filename_;
1742         ///
1743         QString abs_;
1744         ///
1745         int tab_;
1746         ///
1747         bool dottedPrefix_;
1748 };
1749
1750
1751 ///
1752 bool operator<(DisplayPath const & a, DisplayPath const & b)
1753 {
1754         return a.displayString() < b.displayString();
1755 }
1756
1757 ///
1758 bool operator==(DisplayPath const & a, DisplayPath const & b)
1759 {
1760         return a.displayString() == b.displayString();
1761 }
1762
1763
1764 void TabWorkArea::updateTabTexts()
1765 {
1766         size_t n = count();
1767         if (n == 0)
1768                 return;
1769         std::list<DisplayPath> paths;
1770         typedef std::list<DisplayPath>::iterator It;
1771
1772         // collect full names first: path into postfix, empty prefix and
1773         // filename without extension
1774         for (size_t i = 0; i < n; ++i) {
1775                 GuiWorkArea * i_wa = workArea(i);
1776                 FileName const fn = i_wa->bufferView().buffer().fileName();
1777                 paths.push_back(DisplayPath(i, fn));
1778         }
1779
1780         // go through path segments and see if it helps to make the path more unique
1781         bool somethingChanged = true;
1782         bool allFinal = false;
1783         while (somethingChanged && !allFinal) {
1784                 // adding path segments changes order
1785                 paths.sort();
1786
1787                 LYXERR(Debug::GUI, "updateTabTexts() iteration start");
1788                 somethingChanged = false;
1789                 allFinal = true;
1790
1791                 // find segments which are not unique (i.e. non-atomic)
1792                 It it = paths.begin();
1793                 It segStart = it;
1794                 QString segString = it->displayString();
1795                 for (; it != paths.end(); ++it) {
1796                         // look to the next item
1797                         It next = it;
1798                         ++next;
1799
1800                         // final?
1801                         allFinal = allFinal && it->final();
1802
1803                         LYXERR(Debug::GUI, "it = " << it->abs()
1804                                << " => " << it->displayString());
1805
1806                         // still the same segment?
1807                         QString nextString;
1808                         if ((next != paths.end()
1809                              && (nextString = next->displayString()) == segString))
1810                                 continue;
1811                         LYXERR(Debug::GUI, "segment ended");
1812
1813                         // only a trivial one with one element?
1814                         if (it == segStart) {
1815                                 // start new segment
1816                                 segStart = next;
1817                                 segString = nextString;
1818                                 continue;
1819                         }
1820
1821                         // we found a non-atomic segment segStart <= sit <= it < next.
1822                         // Shift path segments and hope for the best
1823                         // that it makes the path more unique.
1824                         somethingChanged = true;
1825                         It sit = segStart;
1826                         QString dspString = sit->forecastPathString();
1827                         LYXERR(Debug::GUI, "first forecast found for "
1828                                << sit->abs() << " => " << dspString);
1829                         ++sit;
1830                         bool moreUnique = false;
1831                         for (; sit != next; ++sit) {
1832                                 if (sit->forecastPathString() != dspString) {
1833                                         LYXERR(Debug::GUI, "different forecast found for "
1834                                                 << sit->abs() << " => " << sit->forecastPathString());
1835                                         moreUnique = true;
1836                                         break;
1837                                 }
1838                                 LYXERR(Debug::GUI, "same forecast found for "
1839                                         << sit->abs() << " => " << dspString);
1840                         }
1841
1842                         // if the path segment helped, add it. Otherwise add dots
1843                         bool dots = !moreUnique;
1844                         LYXERR(Debug::GUI, "using dots = " << dots);
1845                         for (sit = segStart; sit != next; ++sit) {
1846                                 sit->shiftPathSegment(dots);
1847                                 LYXERR(Debug::GUI, "shifting "
1848                                         << sit->abs() << " => " << sit->displayString());
1849                         }
1850
1851                         // start new segment
1852                         segStart = next;
1853                         segString = nextString;
1854                 }
1855         }
1856
1857         // set new tab titles
1858         for (It it = paths.begin(); it != paths.end(); ++it) {
1859                 GuiWorkArea * i_wa = workArea(it->tab());
1860                 Buffer & buf = i_wa->bufferView().buffer();
1861                 if (!buf.fileName().empty() && !buf.isClean())
1862                         setTabText(it->tab(), it->displayString() + "*");
1863                 else
1864                         setTabText(it->tab(), it->displayString());
1865         }
1866 }
1867
1868
1869 void TabWorkArea::showContextMenu(const QPoint & pos)
1870 {
1871         // which tab?
1872         clicked_tab_ = static_cast<DragTabBar *>(tabBar())->tabAt(pos);
1873         if (clicked_tab_ == -1)
1874                 return;
1875
1876         // show tab popup
1877         QMenu popup;
1878         popup.addAction(QIcon(getPixmap("images/", "hidetab", "png")),
1879                 qt_("Hide tab"), this, SLOT(hideCurrentTab()));
1880         popup.addAction(QIcon(getPixmap("images/", "closetab", "png")),
1881                 qt_("Close tab"), this, SLOT(closeCurrentBuffer()));
1882         popup.exec(tabBar()->mapToGlobal(pos));
1883
1884         clicked_tab_ = -1;
1885 }
1886
1887
1888 void TabWorkArea::moveTab(int fromIndex, int toIndex)
1889 {
1890         QWidget * w = widget(fromIndex);
1891         QIcon icon = tabIcon(fromIndex);
1892         QString text = tabText(fromIndex);
1893
1894         setCurrentIndex(fromIndex);
1895         removeTab(fromIndex);
1896         insertTab(toIndex, w, icon, text);
1897         setCurrentIndex(toIndex);
1898 }
1899
1900
1901 DragTabBar::DragTabBar(QWidget* parent)
1902         : QTabBar(parent)
1903 {
1904         setAcceptDrops(true);
1905 #if QT_VERSION >= 0x040500
1906         setTabsClosable(!lyxrc.single_close_tab_button);
1907 #endif
1908 }
1909
1910
1911 #if QT_VERSION < 0x040300
1912 int DragTabBar::tabAt(QPoint const & position) const
1913 {
1914         const int max = count();
1915         for (int i = 0; i < max; ++i) {
1916                 if (tabRect(i).contains(position))
1917                         return i;
1918         }
1919         return -1;
1920 }
1921 #endif
1922
1923
1924 void DragTabBar::mousePressEvent(QMouseEvent * event)
1925 {
1926         if (event->button() == Qt::LeftButton)
1927                 dragStartPos_ = event->pos();
1928         QTabBar::mousePressEvent(event);
1929 }
1930
1931
1932 void DragTabBar::mouseMoveEvent(QMouseEvent * event)
1933 {
1934         // If the left button isn't pressed anymore then return
1935         if (!(event->buttons() & Qt::LeftButton))
1936                 return;
1937
1938         // If the distance is too small then return
1939         if ((event->pos() - dragStartPos_).manhattanLength()
1940             < QApplication::startDragDistance())
1941                 return;
1942
1943         // did we hit something after all?
1944         int tab = tabAt(dragStartPos_);
1945         if (tab == -1)
1946                 return;
1947
1948         // simulate button release to remove highlight from button
1949         int i = currentIndex();
1950         QMouseEvent me(QEvent::MouseButtonRelease, dragStartPos_,
1951                 event->button(), event->buttons(), 0);
1952         QTabBar::mouseReleaseEvent(&me);
1953         setCurrentIndex(i);
1954
1955         // initiate Drag
1956         QDrag * drag = new QDrag(this);
1957         QMimeData * mimeData = new QMimeData;
1958         // a crude way to distinguish tab-reodering drops from other ones
1959         mimeData->setData("action", "tab-reordering") ;
1960         drag->setMimeData(mimeData);
1961
1962 #if QT_VERSION >= 0x040300
1963         // get tab pixmap as cursor
1964         QRect r = tabRect(tab);
1965         QPixmap pixmap(r.size());
1966         render(&pixmap, - r.topLeft());
1967         drag->setPixmap(pixmap);
1968         drag->exec();
1969 #else
1970         drag->start(Qt::MoveAction);
1971 #endif
1972
1973 }
1974
1975
1976 void DragTabBar::dragEnterEvent(QDragEnterEvent * event)
1977 {
1978         // Only accept if it's an tab-reordering request
1979         QMimeData const * m = event->mimeData();
1980         QStringList formats = m->formats();
1981         if (formats.contains("action")
1982             && m->data("action") == "tab-reordering")
1983                 event->acceptProposedAction();
1984 }
1985
1986
1987 void DragTabBar::dropEvent(QDropEvent * event)
1988 {
1989         int fromIndex = tabAt(dragStartPos_);
1990         int toIndex = tabAt(event->pos());
1991
1992         // Tell interested objects that
1993         if (fromIndex != toIndex)
1994                 tabMoveRequested(fromIndex, toIndex);
1995         event->acceptProposedAction();
1996 }
1997
1998
1999 } // namespace frontend
2000 } // namespace lyx
2001
2002 #include "moc_GuiWorkArea.cpp"