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 "Buffer.h"
  17 #include "BufferParams.h"
  18 #include "BufferView.h"
  19 #include "CoordCache.h"
  20 #include "Cursor.h"
  21 #include "Font.h"
  22 #include "FuncRequest.h"
  23 #include "GuiApplication.h"
  24 #include "GuiKeySymbol.h"
  25 #include "GuiPainter.h"
  26 #include "GuiPopupMenu.h"
  27 #include "GuiView.h"
  28 #include "KeySymbol.h"
  29 #include "Language.h"
  30 #include "LyXFunc.h"
  31 #include "LyXRC.h"
  32 #include "MetricsInfo.h"
  33 #include "qt_helpers.h"
  34 #include "version.h"
  35
  36 #include "graphics/GraphicsImage.h"
  37 #include "graphics/GraphicsLoader.h"
  38
  39 #include "support/debug.h"
  40 #include "support/gettext.h"
  41 #include "support/FileName.h"
  42
  43 #include "frontends/Application.h"
  44 #include "frontends/FontMetrics.h"
  45 #include "frontends/WorkAreaManager.h"
  46
  47 #include <QContextMenuEvent>
  48 #include <QInputContext>
  49 #include <QHelpEvent>
  50 #include <QMainWindow>
  51 #include <QPainter>
  52 #include <QPalette>
  53 #include <QScrollBar>
  54 #include <QTabBar>
  55 #include <QTimer>
  56 #include <QToolButton>
  57 #include <QToolTip>
  58
  59 #include <boost/bind.hpp>
  60
  61 #ifdef Q_WS_X11
  62 #include <QX11Info>
  63 extern "C" int XEventsQueued(Display *display, int mode);
  64 #endif
  65
  66 #ifdef Q_WS_WIN
  67 int const CursorWidth = 2;
  68 #else
  69 int const CursorWidth = 1;
  70 #endif
  71
  72 #undef KeyPress
  73 #undef NoModifier
  74
  75 using namespace std;
  76 using namespace lyx::support;
  77
  78 namespace lyx {
  79
  80
  81 /// return the LyX mouse button state from Qt's
  82 static mouse_button::state q_button_state(Qt::MouseButton button)
  83 {
  84         mouse_button::state b = mouse_button::none;
  85         switch (button) {
  86                 case Qt::LeftButton:
  87                         b = mouse_button::button1;
  88                         break;
  89                 case Qt::MidButton:
  90                         b = mouse_button::button2;
  91                         break;
  92                 case Qt::RightButton:
  93                         b = mouse_button::button3;
  94                         break;
  95                 default:
  96                         break;
  97         }
  98         return b;
  99 }
 100
 101
 102 /// return the LyX mouse button state from Qt's
 103 mouse_button::state q_motion_state(Qt::MouseButtons state)
 104 {
 105         mouse_button::state b = mouse_button::none;
 106         if (state & Qt::LeftButton)
 107                 b |= mouse_button::button1;
 108         if (state & Qt::MidButton)
 109                 b |= mouse_button::button2;
 110         if (state & Qt::RightButton)
 111                 b |= mouse_button::button3;
 112         return b;
 113 }
 114
 115
 116 namespace frontend {
 117
 118 class CursorWidget {
 119 public:
 120         CursorWidget() {}
 121
 122         void draw(QPainter & painter)
 123         {
 124                 if (show_ && rect_.isValid()) {
 125                         switch (shape_) {
 126                         case L_SHAPE:
 127                                 painter.fillRect(rect_.x(), rect_.y(), CursorWidth, rect_.height(), color_);
 128                                 painter.setPen(color_);
 129                                 painter.drawLine(rect_.bottomLeft().x() + CursorWidth, rect_.bottomLeft().y(),
 130                                                                                                  rect_.bottomRight().x(), rect_.bottomLeft().y());
 131                                 break;
 132
 133                         case REVERSED_L_SHAPE:
 134                                 painter.fillRect(rect_.x() + rect_.height() / 3, rect_.y(), CursorWidth, rect_.height(), color_);
 135                                 painter.setPen(color_);
 136                                 painter.drawLine(rect_.bottomRight().x() - CursorWidth, rect_.bottomLeft().y(),
 137                                                                                                          rect_.bottomLeft().x(), rect_.bottomLeft().y());
 138                                 break;
 139
 140                         default:
 141                                 painter.fillRect(rect_, color_);
 142                                 break;
 143                         }
 144                 }
 145         }
 146
 147         void update(int x, int y, int h, CursorShape shape)
 148         {
 149                 color_ = guiApp->colorCache().get(Color_cursor);
 150                 shape_ = shape;
 151                 switch (shape) {
 152                 case L_SHAPE:
 153                         rect_ = QRect(x, y, CursorWidth + h / 3, h);
 154                         break;
 155                 case REVERSED_L_SHAPE:
 156                         rect_ = QRect(x - h / 3, y, CursorWidth + h / 3, h);
 157                         break;
 158                 default:
 159                         rect_ = QRect(x, y, CursorWidth, h);
 160                         break;
 161                 }
 162         }
 163
 164         void show(bool set_show = true) { show_ = set_show; }
 165         void hide() { show_ = false; }
 166
 167         QRect const & rect() { return rect_; }
 168
 169 private:
 170         ///
 171         CursorShape shape_;
 172         ///
 173         bool show_;
 174         ///
 175         QColor color_;
 176         ///
 177         QRect rect_;
 178 };
 179
 180
 181 // This is a 'heartbeat' generating synthetic mouse move events when the
 182 // cursor is at the top or bottom edge of the viewport. One scroll per 0.2 s
 183 SyntheticMouseEvent::SyntheticMouseEvent()
 184         : timeout(200), restart_timeout(true),
 185           x_old(-1), y_old(-1), scrollbar_value_old(-1.0)
 186 {}
 187
 188
 189
 190 GuiWorkArea::GuiWorkArea(Buffer & buffer, GuiView & lv)
 191         : buffer_view_(new BufferView(buffer)), lyx_view_(&lv),
 192           cursor_visible_(false),
 193     need_resize_(false), schedule_redraw_(false),
 194                 preedit_lines_(1)
 195 {
 196         buffer.workAreaManager().add(this);
 197         // Setup the signals
 198         connect(&cursor_timeout_, SIGNAL(timeout()),
 199                 this, SLOT(toggleCursor()));
 200
 201         int const time = QApplication::cursorFlashTime() / 2;
 202         if (time > 0) {
 203                 cursor_timeout_.setInterval(time);
 204                 cursor_timeout_.start();
 205         } else
 206                 // let's initialize this just to be safe
 207                 cursor_timeout_.setInterval(500);
 208
 209         screen_ = QPixmap(viewport()->width(), viewport()->height());
 210         cursor_ = new frontend::CursorWidget();
 211         cursor_->hide();
 212
 213         setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 214         setAcceptDrops(true);
 215         setMouseTracking(true);
 216         setMinimumSize(100, 70);
 217         updateWindowTitle();
 218
 219         viewport()->setAutoFillBackground(false);
 220         // We don't need double-buffering nor SystemBackground on
 221         // the viewport because we have our own backing pixmap.
 222         viewport()->setAttribute(Qt::WA_NoSystemBackground);
 223
 224         setFocusPolicy(Qt::WheelFocus);
 225
 226         viewport()->setCursor(Qt::IBeamCursor);
 227
 228         synthetic_mouse_event_.timeout.timeout.connect(
 229                 boost::bind(&GuiWorkArea::generateSyntheticMouseEvent,
 230                                         this));
 231
 232         // Initialize the vertical Scroll Bar
 233         QObject::connect(verticalScrollBar(), SIGNAL(valueChanged(int)),
 234                 this, SLOT(scrollTo(int)));
 235
 236         LYXERR(Debug::GUI, "viewport width: " << viewport()->width()
 237                 << "  viewport height: " << viewport()->height());
 238
 239         // Enables input methods for asian languages.
 240         // Must be set when creating custom text editing widgets.
 241         setAttribute(Qt::WA_InputMethodEnabled, true);
 242 }
 243
 244
 245
 246 GuiWorkArea::~GuiWorkArea()
 247 {
 248         buffer_view_->buffer().workAreaManager().remove(this);
 249         delete buffer_view_;
 250         delete cursor_;
 251 }
 252
 253
 254 void GuiWorkArea::close()
 255 {
 256         lyx_view_->removeWorkArea(this);
 257 }
 258
 259
 260 BufferView & GuiWorkArea::bufferView()
 261 {
 262         return *buffer_view_;
 263 }
 264
 265
 266 BufferView const & GuiWorkArea::bufferView() const
 267 {
 268         return *buffer_view_;
 269 }
 270
 271
 272 void GuiWorkArea::stopBlinkingCursor()
 273 {
 274         cursor_timeout_.stop();
 275         hideCursor();
 276 }
 277
 278
 279 void GuiWorkArea::startBlinkingCursor()
 280 {
 281         showCursor();
 282         //we're not supposed to cache this value.
 283         int const time = QApplication::cursorFlashTime() / 2;
 284         if (time <= 0)
 285                 return;
 286         cursor_timeout_.setInterval(time);
 287         cursor_timeout_.start();
 288 }
 289
 290
 291 void GuiWorkArea::redraw()
 292 {
 293         if (!isVisible())
 294                 // No need to redraw in this case.
 295                 return;
 296
 297         // No need to do anything if this is the current view. The BufferView
 298         // metrics are already up to date.
 299         if (lyx_view_ != guiApp->currentView()) {
 300                 // FIXME: it would be nice to optimize for the off-screen case.
 301                 buffer_view_->updateMetrics();
 302                 buffer_view_->cursor().fixIfBroken();
 303         }
 304
 305         // update cursor position, because otherwise it has to wait until
 306         // the blinking interval is over
 307         if (cursor_visible_) {
 308                 hideCursor();
 309                 showCursor();
 310         }
 311
 312         LYXERR(Debug::WORKAREA, "WorkArea::redraw screen");
 313         updateScreen();
 314         update(0, 0, viewport()->width(), viewport()->height());
 315
 316         /// \warning: scrollbar updating *must* be done after the BufferView is drawn
 317         /// because \c BufferView::updateScrollbar() is called in \c BufferView::draw().
 318         updateScrollbar();
 319         lyx_view_->updateStatusBar();
 320
 321         if (lyxerr.debugging(Debug::WORKAREA))
 322                 buffer_view_->coordCache().dump();
 323 }
 324
 325
 326 void GuiWorkArea::processKeySym(KeySymbol const & key, KeyModifier mod)
 327 {
 328         // In order to avoid bad surprise in the middle of an operation,
 329         // we better stop the blinking cursor...
 330         // the cursor gets restarted in GuiView::restartCursor()
 331         stopBlinkingCursor();
 332
 333         theLyXFunc().setLyXView(lyx_view_);
 334         theLyXFunc().processKeySym(key, mod);
 335
 336 }
 337
 338
 339 void GuiWorkArea::dispatch(FuncRequest const & cmd0, KeyModifier mod)
 340 {
 341         // Handle drag&drop
 342         if (cmd0.action == LFUN_FILE_OPEN) {
 343                 lyx_view_->dispatch(cmd0);
 344                 return;
 345         }
 346
 347         theLyXFunc().setLyXView(lyx_view_);
 348
 349         FuncRequest cmd;
 350
 351         if (cmd0.action == LFUN_MOUSE_PRESS) {
 352                 if (mod == ShiftModifier)
 353                         cmd = FuncRequest(cmd0, "region-select");
 354                 else if (mod == ControlModifier)
 355                         cmd = FuncRequest(cmd0, "paragraph-select");
 356                 else
 357                         cmd = cmd0;
 358         }
 359         else
 360                 cmd = cmd0;
 361
 362         bool const notJustMovingTheMouse =
 363                 cmd.action != LFUN_MOUSE_MOTION || cmd.button() != mouse_button::none;
 364
 365         // In order to avoid bad surprise in the middle of an operation, we better stop
 366         // the blinking cursor.
 367         if (notJustMovingTheMouse)
 368                 stopBlinkingCursor();
 369
 370         buffer_view_->mouseEventDispatch(cmd);
 371
 372         // Skip these when selecting
 373         if (cmd.action != LFUN_MOUSE_MOTION) {
 374                 lyx_view_->updateLayoutList();
 375                 lyx_view_->updateToolbars();
 376         }
 377
 378         // GUI tweaks except with mouse motion with no button pressed.
 379         if (notJustMovingTheMouse) {
 380                 // Slight hack: this is only called currently when we
 381                 // clicked somewhere, so we force through the display
 382                 // of the new status here.
 383                 lyx_view_->clearMessage();
 384
 385                 // Show the cursor immediately after any operation
 386                 startBlinkingCursor();
 387         }
 388 }
 389
 390
 391 void GuiWorkArea::resizeBufferView()
 392 {
 393         // WARNING: Please don't put any code that will trigger a repaint here!
 394         // We are already inside a paint event.
 395         lyx_view_->setBusy(true);
 396         buffer_view_->resize(viewport()->width(), viewport()->height());
 397         lyx_view_->updateLayoutList();
 398         lyx_view_->setBusy(false);
 399         need_resize_ = false;
 400 }
 401
 402
 403 void GuiWorkArea::showCursor()
 404 {
 405         if (cursor_visible_)
 406                 return;
 407
 408         CursorShape shape = BAR_SHAPE;
 409
 410         Font const & realfont = buffer_view_->cursor().real_current_font;
 411         BufferParams const & bp = buffer_view_->buffer().params();
 412         bool const samelang = realfont.language() == bp.language;
 413         bool const isrtl = realfont.isVisibleRightToLeft();
 414
 415         if (!samelang || isrtl != bp.language->rightToLeft()) {
 416                 shape = L_SHAPE;
 417                 if (isrtl)
 418                         shape = REVERSED_L_SHAPE;
 419         }
 420
 421         // The ERT language hack needs fixing up
 422         if (realfont.language() == latex_language)
 423                 shape = BAR_SHAPE;
 424
 425         Font const font = buffer_view_->cursor().getFont();
 426         FontMetrics const & fm = theFontMetrics(font);
 427         int const asc = fm.maxAscent();
 428         int const des = fm.maxDescent();
 429         int h = asc + des;
 430         int x = 0;
 431         int y = 0;
 432         buffer_view_->cursor().getPos(x, y);
 433         y -= asc;
 434
 435         // if it doesn't touch the screen, don't try to show it
 436         if (y + h < 0 || y >= viewport()->height())
 437                 return;
 438
 439         cursor_visible_ = true;
 440         showCursor(x, y, h, shape);
 441 }
 442
 443
 444 void GuiWorkArea::hideCursor()
 445 {
 446         if (!cursor_visible_)
 447                 return;
 448
 449         cursor_visible_ = false;
 450         removeCursor();
 451 }
 452
 453
 454 void GuiWorkArea::toggleCursor()
 455 {
 456         if (cursor_visible_)
 457                 hideCursor();
 458         else
 459                 showCursor();
 460 }
 461
 462
 463 void GuiWorkArea::updateScrollbar()
 464 {
 465         ScrollbarParameters const & scroll_ = buffer_view_->scrollbarParameters();
 466
 467         verticalScrollBar()->setRange(scroll_.min, scroll_.max);
 468         verticalScrollBar()->setPageStep(scroll_.page_step);
 469         verticalScrollBar()->setSingleStep(scroll_.single_step);
 470         // Block the scrollbar signal to prevent recursive signal/slot calling.
 471         verticalScrollBar()->blockSignals(true);
 472         verticalScrollBar()->setValue(scroll_.position);
 473         verticalScrollBar()->setSliderPosition(scroll_.position);
 474         verticalScrollBar()->blockSignals(false);
 475 }
 476
 477
 478 void GuiWorkArea::scrollTo(int value)
 479 {
 480         stopBlinkingCursor();
 481         buffer_view_->scrollDocView(value);
 482
 483         if (lyxrc.cursor_follows_scrollbar) {
 484                 buffer_view_->setCursorFromScrollbar();
 485                 lyx_view_->updateLayoutList();
 486         }
 487         // Show the cursor immediately after any operation.
 488         startBlinkingCursor();
 489         QApplication::syncX();
 490 }
 491
 492
 493 bool GuiWorkArea::event(QEvent * e)
 494 {
 495         switch (e->type()) {
 496         case QEvent::ToolTip: {
 497                 QHelpEvent * helpEvent = static_cast<QHelpEvent *>(e);
 498                 if (lyxrc.use_tooltip) {
 499                         QPoint pos = helpEvent->pos();
 500                         if (pos.x() < viewport()->width()) {
 501                                 QString s = toqstr(buffer_view_->toolTip(pos.x(), pos.y()));
 502                                 QToolTip::showText(helpEvent->globalPos(), s);
 503                         }
 504                         else
 505                                 QToolTip::hideText();
 506                 }
 507                 // Don't forget to accept the event!
 508                 e->accept();
 509                 return true;
 510         }
 511
 512         case QEvent::ShortcutOverride: {
 513                 // We catch this event in order to catch the Tab or Shift+Tab key press
 514                 // which are otherwise reserved to focus switching between controls
 515                 // within a dialog.
 516                 QKeyEvent * ke = static_cast<QKeyEvent*>(e);
 517                 if ((ke->key() != Qt::Key_Tab && ke->key() != Qt::Key_Backtab)
 518                         || ke->modifiers() & Qt::ControlModifier)
 519                         return QAbstractScrollArea::event(e);
 520                 keyPressEvent(ke);
 521                 return true;
 522         }
 523
 524         default:
 525                 return QAbstractScrollArea::event(e);
 526         }
 527         return false;
 528 }
 529
 530
 531 void GuiWorkArea::contextMenuEvent(QContextMenuEvent * e)
 532 {
 533         QPoint pos = e->pos();
 534         docstring name = buffer_view_->contextMenu(pos.x(), pos.y());
 535         if (name.empty()) {
 536                 QAbstractScrollArea::contextMenuEvent(e);
 537                 return;
 538         }
 539         QMenu * menu = guiApp->menus().menu(toqstr(name));
 540         if (!menu) {
 541                 QAbstractScrollArea::contextMenuEvent(e);
 542                 return;
 543         }
 544         // Position the menu to the right.
 545         // FIXME: menu position should be different for RTL text.
 546         menu->exec(e->globalPos());
 547         e->accept();
 548 }
 549
 550
 551 void GuiWorkArea::focusInEvent(QFocusEvent * /*event*/)
 552 {
 553         // Repaint the whole screen.
 554         // Note: this is different from redraw() as only the backing pixmap
 555         // will be redrawn, which is cheap.
 556         viewport()->repaint();
 557
 558         startBlinkingCursor();
 559 }
 560
 561
 562 void GuiWorkArea::focusOutEvent(QFocusEvent * /*event*/)
 563 {
 564         stopBlinkingCursor();
 565 }
 566
 567
 568 void GuiWorkArea::mousePressEvent(QMouseEvent * e)
 569 {
 570         if (dc_event_.active && dc_event_ == *e) {
 571                 dc_event_.active = false;
 572                 FuncRequest cmd(LFUN_MOUSE_TRIPLE, e->x(), e->y(),
 573                         q_button_state(e->button()));
 574                 dispatch(cmd);
 575                 return;
 576         }
 577
 578         inputContext()->reset();
 579
 580         FuncRequest const cmd(LFUN_MOUSE_PRESS, e->x(), e->y(),
 581                 q_button_state(e->button()));
 582         dispatch(cmd, q_key_state(e->modifiers()));
 583 }
 584
 585
 586 void GuiWorkArea::mouseReleaseEvent(QMouseEvent * e)
 587 {
 588         if (synthetic_mouse_event_.timeout.running())
 589                 synthetic_mouse_event_.timeout.stop();
 590
 591         FuncRequest const cmd(LFUN_MOUSE_RELEASE, e->x(), e->y(),
 592                               q_button_state(e->button()));
 593         dispatch(cmd);
 594 }
 595
 596
 597 void GuiWorkArea::mouseMoveEvent(QMouseEvent * e)
 598 {
 599         // we kill the triple click if we move
 600         doubleClickTimeout();
 601         FuncRequest cmd(LFUN_MOUSE_MOTION, e->x(), e->y(),
 602                 q_motion_state(e->buttons()));
 603
 604         // If we're above or below the work area...
 605         if (e->y() <= 20 || e->y() >= viewport()->height() - 20) {
 606                 // Make sure only a synthetic event can cause a page scroll,
 607                 // so they come at a steady rate:
 608                 if (e->y() <= 20)
 609                         // _Force_ a scroll up:
 610                         cmd.y = -40;
 611                 else
 612                         cmd.y = viewport()->height();
 613                 // Store the event, to be handled when the timeout expires.
 614                 synthetic_mouse_event_.cmd = cmd;
 615
 616                 if (synthetic_mouse_event_.timeout.running())
 617                         // Discard the event. Note that it _may_ be handled
 618                         // when the timeout expires if
 619                         // synthetic_mouse_event_.cmd has not been overwritten.
 620                         // Ie, when the timeout expires, we handle the
 621                         // most recent event but discard all others that
 622                         // occurred after the one used to start the timeout
 623                         // in the first place.
 624                         return;
 625
 626                 synthetic_mouse_event_.restart_timeout = true;
 627                 synthetic_mouse_event_.timeout.start();
 628                 // Fall through to handle this event...
 629
 630         } else if (synthetic_mouse_event_.timeout.running()) {
 631                 // Store the event, to be possibly handled when the timeout
 632                 // expires.
 633                 // Once the timeout has expired, normal control is returned
 634                 // to mouseMoveEvent (restart_timeout = false).
 635                 // This results in a much smoother 'feel' when moving the
 636                 // mouse back into the work area.
 637                 synthetic_mouse_event_.cmd = cmd;
 638                 synthetic_mouse_event_.restart_timeout = false;
 639                 return;
 640         }
 641
 642         // Has anything changed on-screen since the last QMouseEvent
 643         // was received?
 644         double const scrollbar_value = verticalScrollBar()->value();
 645         if (e->x() == synthetic_mouse_event_.x_old
 646                 && e->y() == synthetic_mouse_event_.y_old
 647                 && scrollbar_value == synthetic_mouse_event_.scrollbar_value_old) {
 648                 // Nothing changed on-screen since the last QMouseEvent.
 649                 return;
 650         }
 651
 652         // Yes something has changed. Store the params used to check this.
 653         synthetic_mouse_event_.x_old = e->x();
 654         synthetic_mouse_event_.y_old = e->y();
 655         synthetic_mouse_event_.scrollbar_value_old = scrollbar_value;
 656
 657         // ... and dispatch the event to the LyX core.
 658         dispatch(cmd);
 659 }
 660
 661
 662 void GuiWorkArea::wheelEvent(QWheelEvent * e)
 663 {
 664         // Wheel rotation by one notch results in a delta() of 120 (see
 665         // documentation of QWheelEvent)
 666         double const lines = qApp->wheelScrollLines()
 667                 * lyxrc.mouse_wheel_speed
 668                 * e->delta() / 120.0;
 669         LYXERR(Debug::SCROLLING, "wheelScrollLines = " << qApp->wheelScrollLines()
 670                 << " delta = " << e->delta()
 671                 << " lines = " << lines);
 672         verticalScrollBar()->setValue(verticalScrollBar()->value() -
 673                 int(lines *  verticalScrollBar()->singleStep()));
 674 }
 675
 676
 677 void GuiWorkArea::generateSyntheticMouseEvent()
 678 {
 679         // Set things off to generate the _next_ 'pseudo' event.
 680         if (synthetic_mouse_event_.restart_timeout)
 681                 synthetic_mouse_event_.timeout.start();
 682
 683         // Has anything changed on-screen since the last timeout signal
 684         // was received?
 685         double const scrollbar_value = verticalScrollBar()->value();
 686         if (scrollbar_value != synthetic_mouse_event_.scrollbar_value_old) {
 687                 // Yes it has. Store the params used to check this.
 688                 synthetic_mouse_event_.scrollbar_value_old = scrollbar_value;
 689
 690                 // ... and dispatch the event to the LyX core.
 691                 dispatch(synthetic_mouse_event_.cmd);
 692         }
 693 }
 694
 695
 696 void GuiWorkArea::keyPressEvent(QKeyEvent * ev)
 697 {
 698         // do nothing if there are other events
 699         // (the auto repeated events come too fast)
 700         // \todo FIXME: remove hard coded Qt keys, process the key binding
 701 #ifdef Q_WS_X11
 702         if (XEventsQueued(QX11Info::display(), 0) > 1 && ev->isAutoRepeat()
 703                         && (Qt::Key_PageDown || Qt::Key_PageUp)) {
 704                 LYXERR(Debug::KEY, "system is busy: scroll key event ignored");
 705                 ev->ignore();
 706                 return;
 707         }
 708 #endif
 709
 710         LYXERR(Debug::KEY, " count: " << ev->count()
 711                 << " text: " << fromqstr(ev->text())
 712                 << " isAutoRepeat: " << ev->isAutoRepeat() << " key: " << ev->key());
 713
 714         KeySymbol sym;
 715         setKeySymbol(&sym, ev);
 716         processKeySym(sym, q_key_state(ev->modifiers()));
 717         ev->accept();
 718 }
 719
 720
 721 void GuiWorkArea::doubleClickTimeout()
 722 {
 723         dc_event_.active = false;
 724 }
 725
 726
 727 void GuiWorkArea::mouseDoubleClickEvent(QMouseEvent * ev)
 728 {
 729         dc_event_ = DoubleClick(ev);
 730         QTimer::singleShot(QApplication::doubleClickInterval(), this,
 731                            SLOT(doubleClickTimeout()));
 732         FuncRequest cmd(LFUN_MOUSE_DOUBLE,
 733                         ev->x(), ev->y(),
 734                         q_button_state(ev->button()));
 735         dispatch(cmd);
 736 }
 737
 738
 739 void GuiWorkArea::resizeEvent(QResizeEvent * ev)
 740 {
 741         QAbstractScrollArea::resizeEvent(ev);
 742         need_resize_ = true;
 743 }
 744
 745
 746 void GuiWorkArea::update(int x, int y, int w, int h)
 747 {
 748         viewport()->repaint(x, y, w, h);
 749 }
 750
 751
 752 void GuiWorkArea::paintEvent(QPaintEvent * ev)
 753 {
 754         QRect const rc = ev->rect();
 755         // LYXERR(Debug::PAINTING, "paintEvent begin: x: " << rc.x()
 756         //      << " y: " << rc.y() << " w: " << rc.width() << " h: " << rc.height());
 757
 758         if (need_resize_) {
 759                 screen_ = QPixmap(viewport()->width(), viewport()->height());
 760                 resizeBufferView();
 761
 762                 // Update scrollbars which might have changed due different
 763                 // BufferView dimension. This is especially important when the
 764                 // BufferView goes from zero-size to the real-size for the first time,
 765                 // as the scrollbar paramters are then set for the first time.
 766                 updateScrollbar();
 767                 BOOST_ASSERT(need_resize_ == false);
 768
 769                 updateScreen();
 770                 hideCursor();
 771                 showCursor();
 772         }
 773
 774         QPainter pain(viewport());
 775         pain.drawPixmap(rc, screen_, rc);
 776         cursor_->draw(pain);
 777 }
 778
 779
 780 void GuiWorkArea::updateScreen()
 781 {
 782         GuiPainter pain(&screen_);
 783         buffer_view_->draw(pain);
 784 }
 785
 786
 787 void GuiWorkArea::showCursor(int x, int y, int h, CursorShape shape)
 788 {
 789         if (schedule_redraw_) {
 790                 buffer_view_->updateMetrics();
 791                 updateScreen();
 792                 viewport()->update(QRect(0, 0, viewport()->width(), viewport()->height()));
 793                 schedule_redraw_ = false;
 794                 // Show the cursor immediately after the update.
 795                 hideCursor();
 796                 toggleCursor();
 797                 return;
 798         }
 799
 800         cursor_->update(x, y, h, shape);
 801         cursor_->show();
 802         viewport()->update(cursor_->rect());
 803 }
 804
 805
 806 void GuiWorkArea::removeCursor()
 807 {
 808         cursor_->hide();
 809         //if (!qApp->focusWidget())
 810                 viewport()->update(cursor_->rect());
 811 }
 812
 813
 814 void GuiWorkArea::inputMethodEvent(QInputMethodEvent * e)
 815 {
 816         QString const & commit_string = e->commitString();
 817         docstring const & preedit_string
 818                 = qstring_to_ucs4(e->preeditString());
 819
 820         if (!commit_string.isEmpty()) {
 821
 822                 LYXERR(Debug::KEY, "preeditString: " << fromqstr(e->preeditString())
 823                         << " commitString: " << fromqstr(e->commitString()));
 824
 825                 int key = 0;
 826
 827                 // FIXME Iwami 04/01/07: we should take care also of UTF16 surrogates here.
 828                 for (int i = 0; i != commit_string.size(); ++i) {
 829                         QKeyEvent ev(QEvent::KeyPress, key, Qt::NoModifier, commit_string[i]);
 830                         keyPressEvent(&ev);
 831                 }
 832         }
 833
 834         // Hide the cursor during the kana-kanji transformation.
 835         if (preedit_string.empty())
 836                 startBlinkingCursor();
 837         else
 838                 stopBlinkingCursor();
 839
 840         // last_width : for checking if last preedit string was/wasn't empty.
 841         static bool last_width = false;
 842         if (!last_width && preedit_string.empty()) {
 843                 // if last_width is last length of preedit string.
 844                 e->accept();
 845                 return;
 846         }
 847
 848         GuiPainter pain(&screen_);
 849         buffer_view_->updateMetrics();
 850         buffer_view_->draw(pain);
 851         FontInfo font = buffer_view_->cursor().getFont().fontInfo();
 852         FontMetrics const & fm = theFontMetrics(font);
 853         int height = fm.maxHeight();
 854         int cur_x = cursor_->rect().left();
 855         int cur_y = cursor_->rect().bottom();
 856
 857         // redraw area of preedit string.
 858         update(0, cur_y - height, viewport()->width(),
 859                 (height + 1) * preedit_lines_);
 860
 861         if (preedit_string.empty()) {
 862                 last_width = false;
 863                 preedit_lines_ = 1;
 864                 e->accept();
 865                 return;
 866         }
 867         last_width = true;
 868
 869         // att : stores an IM attribute.
 870         QList<QInputMethodEvent::Attribute> const & att = e->attributes();
 871
 872         // get attributes of input method cursor.
 873         // cursor_pos : cursor position in preedit string.
 874         size_t cursor_pos = 0;
 875         bool cursor_is_visible = false;
 876         for (int i = 0; i != att.size(); ++i) {
 877                 if (att.at(i).type == QInputMethodEvent::Cursor) {
 878                         cursor_pos = att.at(i).start;
 879                         cursor_is_visible = att.at(i).length != 0;
 880                         break;
 881                 }
 882         }
 883
 884         size_t preedit_length = preedit_string.length();
 885
 886         // get position of selection in input method.
 887         // FIXME: isn't there a way to do this simplier?
 888         // rStart : cursor position in selected string in IM.
 889         size_t rStart = 0;
 890         // rLength : selected string length in IM.
 891         size_t rLength = 0;
 892         if (cursor_pos < preedit_length) {
 893                 for (int i = 0; i != att.size(); ++i) {
 894                         if (att.at(i).type == QInputMethodEvent::TextFormat) {
 895                                 if (att.at(i).start <= int(cursor_pos)
 896                                         && int(cursor_pos) < att.at(i).start + att.at(i).length) {
 897                                                 rStart = att.at(i).start;
 898                                                 rLength = att.at(i).length;
 899                                                 if (!cursor_is_visible)
 900                                                         cursor_pos += rLength;
 901                                                 break;
 902                                 }
 903                         }
 904                 }
 905         }
 906         else {
 907                 rStart = cursor_pos;
 908                 rLength = 0;
 909         }
 910
 911         int const right_margin = buffer_view_->rightMargin();
 912         Painter::preedit_style ps;
 913         // Most often there would be only one line:
 914         preedit_lines_ = 1;
 915         for (size_t pos = 0; pos != preedit_length; ++pos) {
 916                 char_type const typed_char = preedit_string[pos];
 917                 // reset preedit string style
 918                 ps = Painter::preedit_default;
 919
 920                 // if we reached the right extremity of the screen, go to next line.
 921                 if (cur_x + fm.width(typed_char) > viewport()->width() - right_margin) {
 922                         cur_x = right_margin;
 923                         cur_y += height + 1;
 924                         ++preedit_lines_;
 925                 }
 926                 // preedit strings are displayed with dashed underline
 927                 // and partial strings are displayed white on black indicating
 928                 // that we are in selecting mode in the input method.
 929                 // FIXME: rLength == preedit_length is not a changing condition
 930                 // FIXME: should be put out of the loop.
 931                 if (pos >= rStart
 932                         && pos < rStart + rLength
 933                         && !(cursor_pos < rLength && rLength == preedit_length))
 934                         ps = Painter::preedit_selecting;
 935
 936                 if (pos == cursor_pos
 937                         && (cursor_pos < rLength && rLength == preedit_length))
 938                         ps = Painter::preedit_cursor;
 939
 940                 // draw one character and update cur_x.
 941                 cur_x += pain.preeditText(cur_x, cur_y, typed_char, font, ps);
 942         }
 943
 944         // update the preedit string screen area.
 945         update(0, cur_y - preedit_lines_*height, viewport()->width(),
 946                 (height + 1) * preedit_lines_);
 947
 948         // Don't forget to accept the event!
 949         e->accept();
 950 }
 951
 952
 953 QVariant GuiWorkArea::inputMethodQuery(Qt::InputMethodQuery query) const
 954 {
 955         QRect cur_r(0,0,0,0);
 956         switch (query) {
 957                 // this is the CJK-specific composition window position.
 958                 case Qt::ImMicroFocus:
 959                         cur_r = cursor_->rect();
 960                         if (preedit_lines_ != 1)
 961                                 cur_r.moveLeft(10);
 962                         cur_r.moveBottom(cur_r.bottom() + cur_r.height() * preedit_lines_);
 963                         // return lower right of cursor in LyX.
 964                         return cur_r;
 965                 default:
 966                         return QWidget::inputMethodQuery(query);
 967         }
 968 }
 969
 970
 971 void GuiWorkArea::updateWindowTitle()
 972 {
 973         docstring maximize_title;
 974         docstring minimize_title;
 975
 976         Buffer & buf = buffer_view_->buffer();
 977         FileName const fileName = buf.fileName();
 978         if (!fileName.empty()) {
 979                 maximize_title = fileName.displayName(30);
 980                 minimize_title = from_utf8(fileName.onlyFileName());
 981                 if (!buf.isClean()) {
 982                         maximize_title += _(" (changed)");
 983                         minimize_title += char_type('*');
 984                 }
 985                 if (buf.isReadonly())
 986                         maximize_title += _(" (read only)");
 987         }
 988
 989         QString title = windowTitle();
 990         QString new_title = toqstr(maximize_title);
 991         if (title == new_title)
 992                 return;
 993
 994         QWidget::setWindowTitle(new_title);
 995         QWidget::setWindowIconText(toqstr(minimize_title));
 996         titleChanged(this);
 997 }
 998
 999
1000 void GuiWorkArea::setReadOnly(bool)
1001 {
1002         updateWindowTitle();
1003         if (this == lyx_view_->currentWorkArea())
1004                 lyx_view_->updateBufferDependent(false);
1005 }
1006
1007
1008 ////////////////////////////////////////////////////////////////////
1009 //
1010 // TabWorkArea
1011 //
1012 ////////////////////////////////////////////////////////////////////
1013
1014 TabWorkArea::TabWorkArea(QWidget * parent) : QTabWidget(parent)
1015 {
1016         QPalette pal = palette();
1017         pal.setColor(QPalette::Active, QPalette::Button,
1018                 pal.color(QPalette::Active, QPalette::Window));
1019         pal.setColor(QPalette::Disabled, QPalette::Button,
1020                 pal.color(QPalette::Disabled, QPalette::Window));
1021         pal.setColor(QPalette::Inactive, QPalette::Button,
1022                 pal.color(QPalette::Inactive, QPalette::Window));
1023
1024         QToolButton * closeTabButton = new QToolButton(this);
1025     closeTabButton->setPalette(pal);
1026         closeTabButton->setIcon(QIcon(":/images/closetab.png"));
1027         closeTabButton->setText("Close");
1028         closeTabButton->setAutoRaise(true);
1029         closeTabButton->setCursor(Qt::ArrowCursor);
1030         closeTabButton->setToolTip(tr("Close tab"));
1031         closeTabButton->setEnabled(true);
1032
1033         QObject::connect(this, SIGNAL(currentChanged(int)),
1034                 this, SLOT(on_currentTabChanged(int)));
1035         QObject::connect(closeTabButton, SIGNAL(clicked()),
1036                 this, SLOT(closeCurrentTab()));
1037
1038         setCornerWidget(closeTabButton);
1039         setUsesScrollButtons(true);
1040 }
1041
1042
1043 void TabWorkArea::showBar(bool show)
1044 {
1045         tabBar()->setEnabled(show);
1046         tabBar()->setVisible(show);
1047 }
1048
1049
1050 GuiWorkArea * TabWorkArea::currentWorkArea()
1051 {
1052         if (count() == 0)
1053                 return 0;
1054
1055         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(currentWidget());
1056         BOOST_ASSERT(wa);
1057         return wa;
1058 }
1059
1060
1061 GuiWorkArea * TabWorkArea::workArea(Buffer & buffer)
1062 {
1063         for (int i = 0; i != count(); ++i) {
1064                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i));
1065                 BOOST_ASSERT(wa);
1066                 if (&wa->bufferView().buffer() == &buffer)
1067                         return wa;
1068         }
1069         return 0;
1070 }
1071
1072
1073 void TabWorkArea::closeAll()
1074 {
1075         while (count()) {
1076                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(0));
1077                 BOOST_ASSERT(wa);
1078                 removeTab(0);
1079                 delete wa;
1080         }
1081 }
1082
1083
1084 bool TabWorkArea::setCurrentWorkArea(GuiWorkArea * work_area)
1085 {
1086         BOOST_ASSERT(work_area);
1087         int index = indexOf(work_area);
1088         if (index == -1)
1089                 return false;
1090
1091         if (index == currentIndex())
1092                 // Make sure the work area is up to date.
1093                 on_currentTabChanged(index);
1094         else
1095                 // Switch to the work area.
1096                 setCurrentIndex(index);
1097         work_area->setFocus();
1098
1099         return true;
1100 }
1101
1102
1103 GuiWorkArea * TabWorkArea::addWorkArea(Buffer & buffer, GuiView & view)
1104 {
1105         GuiWorkArea * wa = new GuiWorkArea(buffer, view);
1106         wa->setUpdatesEnabled(false);
1107         // Hide tabbar if there's no tab (avoid a resize and a flashing tabbar
1108         // when hiding it again below).
1109         showBar(count() > 0);
1110         addTab(wa, wa->windowTitle());
1111         QObject::connect(wa, SIGNAL(titleChanged(GuiWorkArea *)),
1112                 this, SLOT(updateTabText(GuiWorkArea *)));
1113         // Hide tabbar if there's only one tab.
1114         showBar(count() > 1);
1115         return wa;
1116 }
1117
1118
1119 bool TabWorkArea::removeWorkArea(GuiWorkArea * work_area)
1120 {
1121         BOOST_ASSERT(work_area);
1122         int index = indexOf(work_area);
1123         if (index == -1)
1124                 return false;
1125
1126         work_area->setUpdatesEnabled(false);
1127         removeTab(index);
1128         delete work_area;
1129
1130         if (count()) {
1131                 // make sure the next work area is enabled.
1132                 currentWidget()->setUpdatesEnabled(true);
1133                 // Hide tabbar if there's only one tab.
1134                 showBar(count() > 1);
1135         }
1136         return true;
1137 }
1138
1139
1140 void TabWorkArea::on_currentTabChanged(int i)
1141 {
1142         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i));
1143         BOOST_ASSERT(wa);
1144         BufferView & bv = wa->bufferView();
1145         bv.cursor().fixIfBroken();
1146         bv.updateMetrics();
1147         wa->setUpdatesEnabled(true);
1148         wa->redraw();
1149         wa->setFocus();
1150         ///
1151         currentWorkAreaChanged(wa);
1152
1153         LYXERR(Debug::GUI, "currentTabChanged " << i
1154                 << "File" << bv.buffer().absFileName());
1155 }
1156
1157
1158 void TabWorkArea::closeCurrentTab()
1159 {
1160         lyx::dispatch(FuncRequest(LFUN_BUFFER_CLOSE));
1161 }
1162
1163
1164 void TabWorkArea::updateTabText(GuiWorkArea * wa)
1165 {
1166         int const i = indexOf(wa);
1167         if (i < 0)
1168                 return;
1169         setTabText(i, wa->windowTitle());
1170 }
1171
1172 } // namespace frontend
1173 } // namespace lyx
1174
1175 #include "GuiWorkArea_moc.cpp"