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 void GuiWorkArea::setFullScreen(bool full_screen)
 261 {
 262         buffer_view_->setFullScreen(full_screen);
 263         if (full_screen) {
 264                 setFrameStyle(QFrame::NoFrame);
 265                 if (lyxrc.full_screen_scrollbar)
 266                         setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 267         } else {
 268                 setFrameStyle(QFrame::Box);
 269                 setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
 270         }
 271 }
 272
 273
 274 BufferView & GuiWorkArea::bufferView()
 275 {
 276         return *buffer_view_;
 277 }
 278
 279
 280 BufferView const & GuiWorkArea::bufferView() const
 281 {
 282         return *buffer_view_;
 283 }
 284
 285
 286 void GuiWorkArea::stopBlinkingCursor()
 287 {
 288         cursor_timeout_.stop();
 289         hideCursor();
 290 }
 291
 292
 293 void GuiWorkArea::startBlinkingCursor()
 294 {
 295         showCursor();
 296         //we're not supposed to cache this value.
 297         int const time = QApplication::cursorFlashTime() / 2;
 298         if (time <= 0)
 299                 return;
 300         cursor_timeout_.setInterval(time);
 301         cursor_timeout_.start();
 302 }
 303
 304
 305 void GuiWorkArea::redraw()
 306 {
 307         if (!isVisible())
 308                 // No need to redraw in this case.
 309                 return;
 310
 311         // No need to do anything if this is the current view. The BufferView
 312         // metrics are already up to date.
 313         if (lyx_view_ != guiApp->currentView()) {
 314                 // FIXME: it would be nice to optimize for the off-screen case.
 315                 buffer_view_->updateMetrics();
 316                 buffer_view_->cursor().fixIfBroken();
 317         }
 318
 319         // update cursor position, because otherwise it has to wait until
 320         // the blinking interval is over
 321         if (cursor_visible_) {
 322                 hideCursor();
 323                 showCursor();
 324         }
 325
 326         LYXERR(Debug::WORKAREA, "WorkArea::redraw screen");
 327         updateScreen();
 328         update(0, 0, viewport()->width(), viewport()->height());
 329
 330         /// \warning: scrollbar updating *must* be done after the BufferView is drawn
 331         /// because \c BufferView::updateScrollbar() is called in \c BufferView::draw().
 332         updateScrollbar();
 333         lyx_view_->updateStatusBar();
 334
 335         if (lyxerr.debugging(Debug::WORKAREA))
 336                 buffer_view_->coordCache().dump();
 337 }
 338
 339
 340 void GuiWorkArea::processKeySym(KeySymbol const & key, KeyModifier mod)
 341 {
 342         // In order to avoid bad surprise in the middle of an operation,
 343         // we better stop the blinking cursor...
 344         // the cursor gets restarted in GuiView::restartCursor()
 345         stopBlinkingCursor();
 346
 347         theLyXFunc().setLyXView(lyx_view_);
 348         theLyXFunc().processKeySym(key, mod);
 349
 350 }
 351
 352
 353 void GuiWorkArea::dispatch(FuncRequest const & cmd0, KeyModifier mod)
 354 {
 355         // Handle drag&drop
 356         if (cmd0.action == LFUN_FILE_OPEN) {
 357                 lyx_view_->dispatch(cmd0);
 358                 return;
 359         }
 360
 361         theLyXFunc().setLyXView(lyx_view_);
 362
 363         FuncRequest cmd;
 364
 365         if (cmd0.action == LFUN_MOUSE_PRESS) {
 366                 if (mod == ShiftModifier)
 367                         cmd = FuncRequest(cmd0, "region-select");
 368                 else if (mod == ControlModifier)
 369                         cmd = FuncRequest(cmd0, "paragraph-select");
 370                 else
 371                         cmd = cmd0;
 372         }
 373         else
 374                 cmd = cmd0;
 375
 376         bool const notJustMovingTheMouse =
 377                 cmd.action != LFUN_MOUSE_MOTION || cmd.button() != mouse_button::none;
 378
 379         // In order to avoid bad surprise in the middle of an operation, we better stop
 380         // the blinking cursor.
 381         if (notJustMovingTheMouse)
 382                 stopBlinkingCursor();
 383
 384         buffer_view_->mouseEventDispatch(cmd);
 385
 386         // Skip these when selecting
 387         if (cmd.action != LFUN_MOUSE_MOTION) {
 388                 lyx_view_->updateLayoutList();
 389                 lyx_view_->updateToolbars();
 390         }
 391
 392         // GUI tweaks except with mouse motion with no button pressed.
 393         if (notJustMovingTheMouse) {
 394                 // Slight hack: this is only called currently when we
 395                 // clicked somewhere, so we force through the display
 396                 // of the new status here.
 397                 lyx_view_->clearMessage();
 398
 399                 // Show the cursor immediately after any operation
 400                 startBlinkingCursor();
 401         }
 402 }
 403
 404
 405 void GuiWorkArea::resizeBufferView()
 406 {
 407         // WARNING: Please don't put any code that will trigger a repaint here!
 408         // We are already inside a paint event.
 409         lyx_view_->setBusy(true);
 410         buffer_view_->resize(viewport()->width(), viewport()->height());
 411         updateScreen();
 412
 413         // Update scrollbars which might have changed due different
 414         // BufferView dimension. This is especially important when the
 415         // BufferView goes from zero-size to the real-size for the first time,
 416         // as the scrollbar paramters are then set for the first time.
 417         updateScrollbar();
 418
 419         lyx_view_->updateLayoutList();
 420         lyx_view_->setBusy(false);
 421         need_resize_ = false;
 422 }
 423
 424
 425 void GuiWorkArea::showCursor()
 426 {
 427         if (cursor_visible_)
 428                 return;
 429
 430         CursorShape shape = BAR_SHAPE;
 431
 432         Font const & realfont = buffer_view_->cursor().real_current_font;
 433         BufferParams const & bp = buffer_view_->buffer().params();
 434         bool const samelang = realfont.language() == bp.language;
 435         bool const isrtl = realfont.isVisibleRightToLeft();
 436
 437         if (!samelang || isrtl != bp.language->rightToLeft()) {
 438                 shape = L_SHAPE;
 439                 if (isrtl)
 440                         shape = REVERSED_L_SHAPE;
 441         }
 442
 443         // The ERT language hack needs fixing up
 444         if (realfont.language() == latex_language)
 445                 shape = BAR_SHAPE;
 446
 447         Font const font = buffer_view_->cursor().getFont();
 448         FontMetrics const & fm = theFontMetrics(font);
 449         int const asc = fm.maxAscent();
 450         int const des = fm.maxDescent();
 451         int h = asc + des;
 452         int x = 0;
 453         int y = 0;
 454         buffer_view_->cursor().getPos(x, y);
 455         y -= asc;
 456
 457         // if it doesn't touch the screen, don't try to show it
 458         if (y + h < 0 || y >= viewport()->height())
 459                 return;
 460
 461         cursor_visible_ = true;
 462         showCursor(x, y, h, shape);
 463 }
 464
 465
 466 void GuiWorkArea::hideCursor()
 467 {
 468         if (!cursor_visible_)
 469                 return;
 470
 471         cursor_visible_ = false;
 472         removeCursor();
 473 }
 474
 475
 476 void GuiWorkArea::toggleCursor()
 477 {
 478         if (cursor_visible_)
 479                 hideCursor();
 480         else
 481                 showCursor();
 482 }
 483
 484
 485 void GuiWorkArea::updateScrollbar()
 486 {
 487         ScrollbarParameters const & scroll_ = buffer_view_->scrollbarParameters();
 488
 489         verticalScrollBar()->setRange(scroll_.min, scroll_.max);
 490         verticalScrollBar()->setPageStep(scroll_.page_step);
 491         verticalScrollBar()->setSingleStep(scroll_.single_step);
 492         // Block the scrollbar signal to prevent recursive signal/slot calling.
 493         verticalScrollBar()->blockSignals(true);
 494         verticalScrollBar()->setValue(scroll_.position);
 495         verticalScrollBar()->setSliderPosition(scroll_.position);
 496         verticalScrollBar()->blockSignals(false);
 497 }
 498
 499
 500 void GuiWorkArea::scrollTo(int value)
 501 {
 502         stopBlinkingCursor();
 503         buffer_view_->scrollDocView(value);
 504
 505         if (lyxrc.cursor_follows_scrollbar) {
 506                 buffer_view_->setCursorFromScrollbar();
 507                 lyx_view_->updateLayoutList();
 508         }
 509         // Show the cursor immediately after any operation.
 510         startBlinkingCursor();
 511         QApplication::syncX();
 512 }
 513
 514
 515 bool GuiWorkArea::event(QEvent * e)
 516 {
 517         switch (e->type()) {
 518         case QEvent::ToolTip: {
 519                 QHelpEvent * helpEvent = static_cast<QHelpEvent *>(e);
 520                 if (lyxrc.use_tooltip) {
 521                         QPoint pos = helpEvent->pos();
 522                         if (pos.x() < viewport()->width()) {
 523                                 QString s = toqstr(buffer_view_->toolTip(pos.x(), pos.y()));
 524                                 QToolTip::showText(helpEvent->globalPos(), s);
 525                         }
 526                         else
 527                                 QToolTip::hideText();
 528                 }
 529                 // Don't forget to accept the event!
 530                 e->accept();
 531                 return true;
 532         }
 533
 534         case QEvent::ShortcutOverride: {
 535                 // We catch this event in order to catch the Tab or Shift+Tab key press
 536                 // which are otherwise reserved to focus switching between controls
 537                 // within a dialog.
 538                 QKeyEvent * ke = static_cast<QKeyEvent*>(e);
 539                 if ((ke->key() != Qt::Key_Tab && ke->key() != Qt::Key_Backtab)
 540                         || ke->modifiers() & Qt::ControlModifier)
 541                         return QAbstractScrollArea::event(e);
 542                 keyPressEvent(ke);
 543                 return true;
 544         }
 545
 546         default:
 547                 return QAbstractScrollArea::event(e);
 548         }
 549         return false;
 550 }
 551
 552
 553 void GuiWorkArea::contextMenuEvent(QContextMenuEvent * e)
 554 {
 555         QPoint pos = e->pos();
 556         docstring name = buffer_view_->contextMenu(pos.x(), pos.y());
 557         if (name.empty()) {
 558                 QAbstractScrollArea::contextMenuEvent(e);
 559                 return;
 560         }
 561         QMenu * menu = guiApp->menus().menu(toqstr(name));
 562         if (!menu) {
 563                 QAbstractScrollArea::contextMenuEvent(e);
 564                 return;
 565         }
 566         // Position the menu to the right.
 567         // FIXME: menu position should be different for RTL text.
 568         menu->exec(e->globalPos());
 569         e->accept();
 570 }
 571
 572
 573 void GuiWorkArea::focusInEvent(QFocusEvent * /*event*/)
 574 {
 575         // Repaint the whole screen.
 576         // Note: this is different from redraw() as only the backing pixmap
 577         // will be redrawn, which is cheap.
 578         viewport()->repaint();
 579
 580         startBlinkingCursor();
 581 }
 582
 583
 584 void GuiWorkArea::focusOutEvent(QFocusEvent * /*event*/)
 585 {
 586         stopBlinkingCursor();
 587 }
 588
 589
 590 void GuiWorkArea::mousePressEvent(QMouseEvent * e)
 591 {
 592         if (dc_event_.active && dc_event_ == *e) {
 593                 dc_event_.active = false;
 594                 FuncRequest cmd(LFUN_MOUSE_TRIPLE, e->x(), e->y(),
 595                         q_button_state(e->button()));
 596                 dispatch(cmd);
 597                 return;
 598         }
 599
 600         inputContext()->reset();
 601
 602         FuncRequest const cmd(LFUN_MOUSE_PRESS, e->x(), e->y(),
 603                 q_button_state(e->button()));
 604         dispatch(cmd, q_key_state(e->modifiers()));
 605 }
 606
 607
 608 void GuiWorkArea::mouseReleaseEvent(QMouseEvent * e)
 609 {
 610         if (synthetic_mouse_event_.timeout.running())
 611                 synthetic_mouse_event_.timeout.stop();
 612
 613         FuncRequest const cmd(LFUN_MOUSE_RELEASE, e->x(), e->y(),
 614                               q_button_state(e->button()));
 615         dispatch(cmd);
 616 }
 617
 618
 619 void GuiWorkArea::mouseMoveEvent(QMouseEvent * e)
 620 {
 621         // we kill the triple click if we move
 622         doubleClickTimeout();
 623         FuncRequest cmd(LFUN_MOUSE_MOTION, e->x(), e->y(),
 624                 q_motion_state(e->buttons()));
 625
 626         // If we're above or below the work area...
 627         if (e->y() <= 20 || e->y() >= viewport()->height() - 20) {
 628                 // Make sure only a synthetic event can cause a page scroll,
 629                 // so they come at a steady rate:
 630                 if (e->y() <= 20)
 631                         // _Force_ a scroll up:
 632                         cmd.y = -40;
 633                 else
 634                         cmd.y = viewport()->height();
 635                 // Store the event, to be handled when the timeout expires.
 636                 synthetic_mouse_event_.cmd = cmd;
 637
 638                 if (synthetic_mouse_event_.timeout.running())
 639                         // Discard the event. Note that it _may_ be handled
 640                         // when the timeout expires if
 641                         // synthetic_mouse_event_.cmd has not been overwritten.
 642                         // Ie, when the timeout expires, we handle the
 643                         // most recent event but discard all others that
 644                         // occurred after the one used to start the timeout
 645                         // in the first place.
 646                         return;
 647
 648                 synthetic_mouse_event_.restart_timeout = true;
 649                 synthetic_mouse_event_.timeout.start();
 650                 // Fall through to handle this event...
 651
 652         } else if (synthetic_mouse_event_.timeout.running()) {
 653                 // Store the event, to be possibly handled when the timeout
 654                 // expires.
 655                 // Once the timeout has expired, normal control is returned
 656                 // to mouseMoveEvent (restart_timeout = false).
 657                 // This results in a much smoother 'feel' when moving the
 658                 // mouse back into the work area.
 659                 synthetic_mouse_event_.cmd = cmd;
 660                 synthetic_mouse_event_.restart_timeout = false;
 661                 return;
 662         }
 663
 664         // Has anything changed on-screen since the last QMouseEvent
 665         // was received?
 666         double const scrollbar_value = verticalScrollBar()->value();
 667         if (e->x() == synthetic_mouse_event_.x_old
 668                 && e->y() == synthetic_mouse_event_.y_old
 669                 && scrollbar_value == synthetic_mouse_event_.scrollbar_value_old) {
 670                 // Nothing changed on-screen since the last QMouseEvent.
 671                 return;
 672         }
 673
 674         // Yes something has changed. Store the params used to check this.
 675         synthetic_mouse_event_.x_old = e->x();
 676         synthetic_mouse_event_.y_old = e->y();
 677         synthetic_mouse_event_.scrollbar_value_old = scrollbar_value;
 678
 679         // ... and dispatch the event to the LyX core.
 680         dispatch(cmd);
 681 }
 682
 683
 684 void GuiWorkArea::wheelEvent(QWheelEvent * e)
 685 {
 686         // Wheel rotation by one notch results in a delta() of 120 (see
 687         // documentation of QWheelEvent)
 688         double const lines = qApp->wheelScrollLines()
 689                 * lyxrc.mouse_wheel_speed
 690                 * e->delta() / 120.0;
 691         LYXERR(Debug::SCROLLING, "wheelScrollLines = " << qApp->wheelScrollLines()
 692                 << " delta = " << e->delta()
 693                 << " lines = " << lines);
 694         verticalScrollBar()->setValue(verticalScrollBar()->value() -
 695                 int(lines *  verticalScrollBar()->singleStep()));
 696 }
 697
 698
 699 void GuiWorkArea::generateSyntheticMouseEvent()
 700 {
 701         // Set things off to generate the _next_ 'pseudo' event.
 702         if (synthetic_mouse_event_.restart_timeout)
 703                 synthetic_mouse_event_.timeout.start();
 704
 705         // Has anything changed on-screen since the last timeout signal
 706         // was received?
 707         double const scrollbar_value = verticalScrollBar()->value();
 708         if (scrollbar_value != synthetic_mouse_event_.scrollbar_value_old) {
 709                 // Yes it has. Store the params used to check this.
 710                 synthetic_mouse_event_.scrollbar_value_old = scrollbar_value;
 711
 712                 // ... and dispatch the event to the LyX core.
 713                 dispatch(synthetic_mouse_event_.cmd);
 714         }
 715 }
 716
 717
 718 void GuiWorkArea::keyPressEvent(QKeyEvent * ev)
 719 {
 720         // do nothing if there are other events
 721         // (the auto repeated events come too fast)
 722         // \todo FIXME: remove hard coded Qt keys, process the key binding
 723 #ifdef Q_WS_X11
 724         if (XEventsQueued(QX11Info::display(), 0) > 1 && ev->isAutoRepeat()
 725                         && (Qt::Key_PageDown || Qt::Key_PageUp)) {
 726                 LYXERR(Debug::KEY, "system is busy: scroll key event ignored");
 727                 ev->ignore();
 728                 return;
 729         }
 730 #endif
 731
 732         LYXERR(Debug::KEY, " count: " << ev->count()
 733                 << " text: " << fromqstr(ev->text())
 734                 << " isAutoRepeat: " << ev->isAutoRepeat() << " key: " << ev->key());
 735
 736         KeySymbol sym;
 737         setKeySymbol(&sym, ev);
 738         processKeySym(sym, q_key_state(ev->modifiers()));
 739         ev->accept();
 740 }
 741
 742
 743 void GuiWorkArea::doubleClickTimeout()
 744 {
 745         dc_event_.active = false;
 746 }
 747
 748
 749 void GuiWorkArea::mouseDoubleClickEvent(QMouseEvent * ev)
 750 {
 751         dc_event_ = DoubleClick(ev);
 752         QTimer::singleShot(QApplication::doubleClickInterval(), this,
 753                            SLOT(doubleClickTimeout()));
 754         FuncRequest cmd(LFUN_MOUSE_DOUBLE,
 755                         ev->x(), ev->y(),
 756                         q_button_state(ev->button()));
 757         dispatch(cmd);
 758 }
 759
 760
 761 void GuiWorkArea::resizeEvent(QResizeEvent * ev)
 762 {
 763         QAbstractScrollArea::resizeEvent(ev);
 764         need_resize_ = true;
 765 }
 766
 767
 768 void GuiWorkArea::update(int x, int y, int w, int h)
 769 {
 770         viewport()->repaint(x, y, w, h);
 771 }
 772
 773
 774 void GuiWorkArea::paintEvent(QPaintEvent * ev)
 775 {
 776         QRect const rc = ev->rect();
 777         // LYXERR(Debug::PAINTING, "paintEvent begin: x: " << rc.x()
 778         //      << " y: " << rc.y() << " w: " << rc.width() << " h: " << rc.height());
 779
 780         if (need_resize_) {
 781                 screen_ = QPixmap(viewport()->width(), viewport()->height());
 782                 resizeBufferView();
 783                 hideCursor();
 784                 showCursor();
 785         }
 786
 787         QPainter pain(viewport());
 788         pain.drawPixmap(rc, screen_, rc);
 789         cursor_->draw(pain);
 790 }
 791
 792
 793 void GuiWorkArea::updateScreen()
 794 {
 795         GuiPainter pain(&screen_);
 796         buffer_view_->draw(pain);
 797 }
 798
 799
 800 void GuiWorkArea::showCursor(int x, int y, int h, CursorShape shape)
 801 {
 802         if (schedule_redraw_) {
 803                 buffer_view_->updateMetrics();
 804                 updateScreen();
 805                 viewport()->update(QRect(0, 0, viewport()->width(), viewport()->height()));
 806                 schedule_redraw_ = false;
 807                 // Show the cursor immediately after the update.
 808                 hideCursor();
 809                 toggleCursor();
 810                 return;
 811         }
 812
 813         cursor_->update(x, y, h, shape);
 814         cursor_->show();
 815         viewport()->update(cursor_->rect());
 816 }
 817
 818
 819 void GuiWorkArea::removeCursor()
 820 {
 821         cursor_->hide();
 822         //if (!qApp->focusWidget())
 823                 viewport()->update(cursor_->rect());
 824 }
 825
 826
 827 void GuiWorkArea::inputMethodEvent(QInputMethodEvent * e)
 828 {
 829         QString const & commit_string = e->commitString();
 830         docstring const & preedit_string
 831                 = qstring_to_ucs4(e->preeditString());
 832
 833         if (!commit_string.isEmpty()) {
 834
 835                 LYXERR(Debug::KEY, "preeditString: " << fromqstr(e->preeditString())
 836                         << " commitString: " << fromqstr(e->commitString()));
 837
 838                 int key = 0;
 839
 840                 // FIXME Iwami 04/01/07: we should take care also of UTF16 surrogates here.
 841                 for (int i = 0; i != commit_string.size(); ++i) {
 842                         QKeyEvent ev(QEvent::KeyPress, key, Qt::NoModifier, commit_string[i]);
 843                         keyPressEvent(&ev);
 844                 }
 845         }
 846
 847         // Hide the cursor during the kana-kanji transformation.
 848         if (preedit_string.empty())
 849                 startBlinkingCursor();
 850         else
 851                 stopBlinkingCursor();
 852
 853         // last_width : for checking if last preedit string was/wasn't empty.
 854         static bool last_width = false;
 855         if (!last_width && preedit_string.empty()) {
 856                 // if last_width is last length of preedit string.
 857                 e->accept();
 858                 return;
 859         }
 860
 861         GuiPainter pain(&screen_);
 862         buffer_view_->updateMetrics();
 863         buffer_view_->draw(pain);
 864         FontInfo font = buffer_view_->cursor().getFont().fontInfo();
 865         FontMetrics const & fm = theFontMetrics(font);
 866         int height = fm.maxHeight();
 867         int cur_x = cursor_->rect().left();
 868         int cur_y = cursor_->rect().bottom();
 869
 870         // redraw area of preedit string.
 871         update(0, cur_y - height, viewport()->width(),
 872                 (height + 1) * preedit_lines_);
 873
 874         if (preedit_string.empty()) {
 875                 last_width = false;
 876                 preedit_lines_ = 1;
 877                 e->accept();
 878                 return;
 879         }
 880         last_width = true;
 881
 882         // att : stores an IM attribute.
 883         QList<QInputMethodEvent::Attribute> const & att = e->attributes();
 884
 885         // get attributes of input method cursor.
 886         // cursor_pos : cursor position in preedit string.
 887         size_t cursor_pos = 0;
 888         bool cursor_is_visible = false;
 889         for (int i = 0; i != att.size(); ++i) {
 890                 if (att.at(i).type == QInputMethodEvent::Cursor) {
 891                         cursor_pos = att.at(i).start;
 892                         cursor_is_visible = att.at(i).length != 0;
 893                         break;
 894                 }
 895         }
 896
 897         size_t preedit_length = preedit_string.length();
 898
 899         // get position of selection in input method.
 900         // FIXME: isn't there a way to do this simplier?
 901         // rStart : cursor position in selected string in IM.
 902         size_t rStart = 0;
 903         // rLength : selected string length in IM.
 904         size_t rLength = 0;
 905         if (cursor_pos < preedit_length) {
 906                 for (int i = 0; i != att.size(); ++i) {
 907                         if (att.at(i).type == QInputMethodEvent::TextFormat) {
 908                                 if (att.at(i).start <= int(cursor_pos)
 909                                         && int(cursor_pos) < att.at(i).start + att.at(i).length) {
 910                                                 rStart = att.at(i).start;
 911                                                 rLength = att.at(i).length;
 912                                                 if (!cursor_is_visible)
 913                                                         cursor_pos += rLength;
 914                                                 break;
 915                                 }
 916                         }
 917                 }
 918         }
 919         else {
 920                 rStart = cursor_pos;
 921                 rLength = 0;
 922         }
 923
 924         int const right_margin = buffer_view_->rightMargin();
 925         Painter::preedit_style ps;
 926         // Most often there would be only one line:
 927         preedit_lines_ = 1;
 928         for (size_t pos = 0; pos != preedit_length; ++pos) {
 929                 char_type const typed_char = preedit_string[pos];
 930                 // reset preedit string style
 931                 ps = Painter::preedit_default;
 932
 933                 // if we reached the right extremity of the screen, go to next line.
 934                 if (cur_x + fm.width(typed_char) > viewport()->width() - right_margin) {
 935                         cur_x = right_margin;
 936                         cur_y += height + 1;
 937                         ++preedit_lines_;
 938                 }
 939                 // preedit strings are displayed with dashed underline
 940                 // and partial strings are displayed white on black indicating
 941                 // that we are in selecting mode in the input method.
 942                 // FIXME: rLength == preedit_length is not a changing condition
 943                 // FIXME: should be put out of the loop.
 944                 if (pos >= rStart
 945                         && pos < rStart + rLength
 946                         && !(cursor_pos < rLength && rLength == preedit_length))
 947                         ps = Painter::preedit_selecting;
 948
 949                 if (pos == cursor_pos
 950                         && (cursor_pos < rLength && rLength == preedit_length))
 951                         ps = Painter::preedit_cursor;
 952
 953                 // draw one character and update cur_x.
 954                 cur_x += pain.preeditText(cur_x, cur_y, typed_char, font, ps);
 955         }
 956
 957         // update the preedit string screen area.
 958         update(0, cur_y - preedit_lines_*height, viewport()->width(),
 959                 (height + 1) * preedit_lines_);
 960
 961         // Don't forget to accept the event!
 962         e->accept();
 963 }
 964
 965
 966 QVariant GuiWorkArea::inputMethodQuery(Qt::InputMethodQuery query) const
 967 {
 968         QRect cur_r(0,0,0,0);
 969         switch (query) {
 970                 // this is the CJK-specific composition window position.
 971                 case Qt::ImMicroFocus:
 972                         cur_r = cursor_->rect();
 973                         if (preedit_lines_ != 1)
 974                                 cur_r.moveLeft(10);
 975                         cur_r.moveBottom(cur_r.bottom() + cur_r.height() * preedit_lines_);
 976                         // return lower right of cursor in LyX.
 977                         return cur_r;
 978                 default:
 979                         return QWidget::inputMethodQuery(query);
 980         }
 981 }
 982
 983
 984 void GuiWorkArea::updateWindowTitle()
 985 {
 986         docstring maximize_title;
 987         docstring minimize_title;
 988
 989         Buffer & buf = buffer_view_->buffer();
 990         FileName const fileName = buf.fileName();
 991         if (!fileName.empty()) {
 992                 maximize_title = fileName.displayName(30);
 993                 minimize_title = from_utf8(fileName.onlyFileName());
 994                 if (!buf.isClean()) {
 995                         maximize_title += _(" (changed)");
 996                         minimize_title += char_type('*');
 997                 }
 998                 if (buf.isReadonly())
 999                         maximize_title += _(" (read only)");
1000         }
1001
1002         QString title = windowTitle();
1003         QString new_title = toqstr(maximize_title);
1004         if (title == new_title)
1005                 return;
1006
1007         QWidget::setWindowTitle(new_title);
1008         QWidget::setWindowIconText(toqstr(minimize_title));
1009         titleChanged(this);
1010 }
1011
1012
1013 void GuiWorkArea::setReadOnly(bool)
1014 {
1015         updateWindowTitle();
1016         if (this == lyx_view_->currentWorkArea())
1017                 lyx_view_->updateBufferDependent(false);
1018 }
1019
1020
1021 ////////////////////////////////////////////////////////////////////
1022 //
1023 // TabWorkArea
1024 //
1025 ////////////////////////////////////////////////////////////////////
1026
1027 TabWorkArea::TabWorkArea(QWidget * parent) : QTabWidget(parent)
1028 {
1029         QPalette pal = palette();
1030         pal.setColor(QPalette::Active, QPalette::Button,
1031                 pal.color(QPalette::Active, QPalette::Window));
1032         pal.setColor(QPalette::Disabled, QPalette::Button,
1033                 pal.color(QPalette::Disabled, QPalette::Window));
1034         pal.setColor(QPalette::Inactive, QPalette::Button,
1035                 pal.color(QPalette::Inactive, QPalette::Window));
1036
1037         QToolButton * closeTabButton = new QToolButton(this);
1038     closeTabButton->setPalette(pal);
1039         closeTabButton->setIcon(QIcon(":/images/closetab.png"));
1040         closeTabButton->setText("Close");
1041         closeTabButton->setAutoRaise(true);
1042         closeTabButton->setCursor(Qt::ArrowCursor);
1043         closeTabButton->setToolTip(tr("Close tab"));
1044         closeTabButton->setEnabled(true);
1045
1046         QObject::connect(this, SIGNAL(currentChanged(int)),
1047                 this, SLOT(on_currentTabChanged(int)));
1048         QObject::connect(closeTabButton, SIGNAL(clicked()),
1049                 this, SLOT(closeCurrentTab()));
1050
1051         setCornerWidget(closeTabButton);
1052         setUsesScrollButtons(true);
1053 }
1054
1055
1056 void TabWorkArea::setFullScreen(bool full_screen)
1057 {
1058         for (int i = 0; i != count(); ++i) {
1059                 if (GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i)))
1060                         wa->setFullScreen(full_screen);
1061         }
1062
1063         if (lyxrc.full_screen_tabbar)
1064                 showBar(!full_screen && count()>1);
1065 }
1066
1067
1068 void TabWorkArea::showBar(bool show)
1069 {
1070         tabBar()->setEnabled(show);
1071         tabBar()->setVisible(show);
1072 }
1073
1074
1075 GuiWorkArea * TabWorkArea::currentWorkArea()
1076 {
1077         if (count() == 0)
1078                 return 0;
1079
1080         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(currentWidget());
1081         BOOST_ASSERT(wa);
1082         return wa;
1083 }
1084
1085
1086 GuiWorkArea * TabWorkArea::workArea(Buffer & buffer)
1087 {
1088         for (int i = 0; i != count(); ++i) {
1089                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i));
1090                 BOOST_ASSERT(wa);
1091                 if (&wa->bufferView().buffer() == &buffer)
1092                         return wa;
1093         }
1094         return 0;
1095 }
1096
1097
1098 void TabWorkArea::closeAll()
1099 {
1100         while (count()) {
1101                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(0));
1102                 BOOST_ASSERT(wa);
1103                 removeTab(0);
1104                 delete wa;
1105         }
1106 }
1107
1108
1109 bool TabWorkArea::setCurrentWorkArea(GuiWorkArea * work_area)
1110 {
1111         BOOST_ASSERT(work_area);
1112         int index = indexOf(work_area);
1113         if (index == -1)
1114                 return false;
1115
1116         if (index == currentIndex())
1117                 // Make sure the work area is up to date.
1118                 on_currentTabChanged(index);
1119         else
1120                 // Switch to the work area.
1121                 setCurrentIndex(index);
1122         work_area->setFocus();
1123
1124         return true;
1125 }
1126
1127
1128 GuiWorkArea * TabWorkArea::addWorkArea(Buffer & buffer, GuiView & view)
1129 {
1130         GuiWorkArea * wa = new GuiWorkArea(buffer, view);
1131         wa->setUpdatesEnabled(false);
1132         // Hide tabbar if there's no tab (avoid a resize and a flashing tabbar
1133         // when hiding it again below).
1134         showBar(count() > 0);
1135         addTab(wa, wa->windowTitle());
1136         QObject::connect(wa, SIGNAL(titleChanged(GuiWorkArea *)),
1137                 this, SLOT(updateTabText(GuiWorkArea *)));
1138         // Hide tabbar if there's only one tab.
1139         showBar(count() > 1);
1140         return wa;
1141 }
1142
1143
1144 bool TabWorkArea::removeWorkArea(GuiWorkArea * work_area)
1145 {
1146         BOOST_ASSERT(work_area);
1147         int index = indexOf(work_area);
1148         if (index == -1)
1149                 return false;
1150
1151         work_area->setUpdatesEnabled(false);
1152         removeTab(index);
1153         delete work_area;
1154
1155         if (count()) {
1156                 // make sure the next work area is enabled.
1157                 currentWidget()->setUpdatesEnabled(true);
1158                 // Hide tabbar if there's only one tab.
1159                 showBar(count() > 1);
1160         }
1161         return true;
1162 }
1163
1164
1165 void TabWorkArea::on_currentTabChanged(int i)
1166 {
1167         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i));
1168         BOOST_ASSERT(wa);
1169         BufferView & bv = wa->bufferView();
1170         bv.cursor().fixIfBroken();
1171         bv.updateMetrics();
1172         wa->setUpdatesEnabled(true);
1173         wa->redraw();
1174         wa->setFocus();
1175         ///
1176         currentWorkAreaChanged(wa);
1177
1178         LYXERR(Debug::GUI, "currentTabChanged " << i
1179                 << "File" << bv.buffer().absFileName());
1180 }
1181
1182
1183 void TabWorkArea::closeCurrentTab()
1184 {
1185         lyx::dispatch(FuncRequest(LFUN_BUFFER_CLOSE));
1186 }
1187
1188
1189 void TabWorkArea::updateTabText(GuiWorkArea * wa)
1190 {
1191         int const i = indexOf(wa);
1192         if (i < 0)
1193                 return;
1194         setTabText(i, wa->windowTitle());
1195 }
1196
1197 } // namespace frontend
1198 } // namespace lyx
1199
1200 #include "GuiWorkArea_moc.cpp"