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