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), completer_(this)
 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 GuiWorkArea::~GuiWorkArea()
 246 {
 247         buffer_view_->buffer().workAreaManager().remove(this);
 248         delete buffer_view_;
 249         delete cursor_;
 250 }
 251
 252
 253 void GuiWorkArea::close()
 254 {
 255         lyx_view_->removeWorkArea(this);
 256 }
 257
 258
 259 void GuiWorkArea::setFullScreen(bool full_screen)
 260 {
 261         buffer_view_->setFullScreen(full_screen);
 262         if (full_screen) {
 263                 setFrameStyle(QFrame::NoFrame);
 264                 if (lyxrc.full_screen_scrollbar)
 265                         setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 266         } else {
 267                 setFrameStyle(QFrame::Box);
 268                 setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
 269         }
 270 }
 271
 272
 273 BufferView & GuiWorkArea::bufferView()
 274 {
 275         return *buffer_view_;
 276 }
 277
 278
 279 BufferView const & GuiWorkArea::bufferView() const
 280 {
 281         return *buffer_view_;
 282 }
 283
 284
 285 void GuiWorkArea::stopBlinkingCursor()
 286 {
 287         cursor_timeout_.stop();
 288         hideCursor();
 289 }
 290
 291
 292 void GuiWorkArea::startBlinkingCursor()
 293 {
 294         showCursor();
 295         //we're not supposed to cache this value.
 296         int const time = QApplication::cursorFlashTime() / 2;
 297         if (time <= 0)
 298                 return;
 299         cursor_timeout_.setInterval(time);
 300         cursor_timeout_.start();
 301 }
 302
 303
 304 void GuiWorkArea::redraw()
 305 {
 306         if (!isVisible())
 307                 // No need to redraw in this case.
 308                 return;
 309
 310         // No need to do anything if this is the current view. The BufferView
 311         // metrics are already up to date.
 312         if (lyx_view_ != guiApp->currentView()
 313                 || lyx_view_->currentWorkArea() != this) {
 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                 completer_.updateVisibility(false, false);
 389                 lyx_view_->updateLayoutList();
 390                 lyx_view_->updateToolbars();
 391         }
 392
 393         // GUI tweaks except with mouse motion with no button pressed.
 394         if (notJustMovingTheMouse) {
 395                 // Slight hack: this is only called currently when we
 396                 // clicked somewhere, so we force through the display
 397                 // of the new status here.
 398                 lyx_view_->clearMessage();
 399
 400                 // Show the cursor immediately after any operation
 401                 startBlinkingCursor();
 402         }
 403 }
 404
 405
 406 void GuiWorkArea::resizeBufferView()
 407 {
 408         // WARNING: Please don't put any code that will trigger a repaint here!
 409         // We are already inside a paint event.
 410         lyx_view_->setBusy(true);
 411         buffer_view_->resize(viewport()->width(), viewport()->height());
 412         updateScreen();
 413
 414         // Update scrollbars which might have changed due different
 415         // BufferView dimension. This is especially important when the
 416         // BufferView goes from zero-size to the real-size for the first time,
 417         // as the scrollbar paramters are then set for the first time.
 418         updateScrollbar();
 419
 420         lyx_view_->updateLayoutList();
 421         lyx_view_->setBusy(false);
 422         need_resize_ = false;
 423 }
 424
 425
 426 void GuiWorkArea::showCursor()
 427 {
 428         if (cursor_visible_)
 429                 return;
 430
 431         CursorShape shape = BAR_SHAPE;
 432
 433         Font const & realfont = buffer_view_->cursor().real_current_font;
 434         BufferParams const & bp = buffer_view_->buffer().params();
 435         bool const samelang = realfont.language() == bp.language;
 436         bool const isrtl = realfont.isVisibleRightToLeft();
 437
 438         if (!samelang || isrtl != bp.language->rightToLeft()) {
 439                 shape = L_SHAPE;
 440                 if (isrtl)
 441                         shape = REVERSED_L_SHAPE;
 442         }
 443
 444         // The ERT language hack needs fixing up
 445         if (realfont.language() == latex_language)
 446                 shape = BAR_SHAPE;
 447
 448         Font const font = buffer_view_->cursor().getFont();
 449         FontMetrics const & fm = theFontMetrics(font);
 450         int const asc = fm.maxAscent();
 451         int const des = fm.maxDescent();
 452         int h = asc + des;
 453         int x = 0;
 454         int y = 0;
 455         Cursor & cur = buffer_view_->cursor();
 456         cur.getPos(x, y);
 457         y -= asc;
 458
 459         // if it doesn't touch the screen, don't try to show it
 460         bool cursorInView = true;
 461         if (y + h < 0 || y >= viewport()->height())
 462                 cursorInView = false;
 463
 464         // show cursor on screen
 465         if (cursorInView) {
 466                 cursor_visible_ = true;
 467                 showCursor(x, y, h, shape);
 468         }
 469 }
 470
 471
 472 void GuiWorkArea::hideCursor()
 473 {
 474         if (!cursor_visible_)
 475                 return;
 476
 477         cursor_visible_ = false;
 478         removeCursor();
 479 }
 480
 481
 482 void GuiWorkArea::toggleCursor()
 483 {
 484         if (cursor_visible_)
 485                 hideCursor();
 486         else
 487                 showCursor();
 488 }
 489
 490
 491 void GuiWorkArea::updateScrollbar()
 492 {
 493         ScrollbarParameters const & scroll_ = buffer_view_->scrollbarParameters();
 494
 495         verticalScrollBar()->setRange(scroll_.min, scroll_.max);
 496         verticalScrollBar()->setPageStep(scroll_.page_step);
 497         verticalScrollBar()->setSingleStep(scroll_.single_step);
 498         // Block the scrollbar signal to prevent recursive signal/slot calling.
 499         verticalScrollBar()->blockSignals(true);
 500         verticalScrollBar()->setValue(scroll_.position);
 501         verticalScrollBar()->setSliderPosition(scroll_.position);
 502         verticalScrollBar()->blockSignals(false);
 503 }
 504
 505
 506 void GuiWorkArea::scrollTo(int value)
 507 {
 508         stopBlinkingCursor();
 509         buffer_view_->scrollDocView(value);
 510
 511         if (lyxrc.cursor_follows_scrollbar) {
 512                 buffer_view_->setCursorFromScrollbar();
 513                 lyx_view_->updateLayoutList();
 514         }
 515         // Show the cursor immediately after any operation.
 516         startBlinkingCursor();
 517         QApplication::syncX();
 518 }
 519
 520
 521 bool GuiWorkArea::event(QEvent * e)
 522 {
 523         switch (e->type()) {
 524         case QEvent::ToolTip: {
 525                 QHelpEvent * helpEvent = static_cast<QHelpEvent *>(e);
 526                 if (lyxrc.use_tooltip) {
 527                         QPoint pos = helpEvent->pos();
 528                         if (pos.x() < viewport()->width()) {
 529                                 QString s = toqstr(buffer_view_->toolTip(pos.x(), pos.y()));
 530                                 QToolTip::showText(helpEvent->globalPos(), s);
 531                         }
 532                         else
 533                                 QToolTip::hideText();
 534                 }
 535                 // Don't forget to accept the event!
 536                 e->accept();
 537                 return true;
 538         }
 539
 540         case QEvent::ShortcutOverride: {
 541                 // We catch this event in order to catch the Tab or Shift+Tab key press
 542                 // which are otherwise reserved to focus switching between controls
 543                 // within a dialog.
 544                 QKeyEvent * ke = static_cast<QKeyEvent*>(e);
 545                 if ((ke->key() != Qt::Key_Tab && ke->key() != Qt::Key_Backtab)
 546                         || ke->modifiers() & Qt::ControlModifier)
 547                         return QAbstractScrollArea::event(e);
 548                 keyPressEvent(ke);
 549                 return true;
 550         }
 551
 552         default:
 553                 return QAbstractScrollArea::event(e);
 554         }
 555         return false;
 556 }
 557
 558
 559 void GuiWorkArea::contextMenuEvent(QContextMenuEvent * e)
 560 {
 561         QPoint pos = e->pos();
 562         docstring name = buffer_view_->contextMenu(pos.x(), pos.y());
 563         if (name.empty()) {
 564                 QAbstractScrollArea::contextMenuEvent(e);
 565                 return;
 566         }
 567         QMenu * menu = guiApp->menus().menu(toqstr(name));
 568         if (!menu) {
 569                 QAbstractScrollArea::contextMenuEvent(e);
 570                 return;
 571         }
 572         // Position the menu to the right.
 573         // FIXME: menu position should be different for RTL text.
 574         menu->exec(e->globalPos());
 575         e->accept();
 576 }
 577
 578
 579 void GuiWorkArea::focusInEvent(QFocusEvent * e)
 580 {
 581         lyx_view_->setCurrentWorkArea(this);
 582         // Repaint the whole screen.
 583         // Note: this is different from redraw() as only the backing pixmap
 584         // will be redrawn, which is cheap.
 585         viewport()->repaint();
 586
 587         startBlinkingCursor();
 588         QAbstractScrollArea::focusInEvent(e);
 589 }
 590
 591
 592 void GuiWorkArea::focusOutEvent(QFocusEvent * e)
 593 {
 594         stopBlinkingCursor();
 595         QAbstractScrollArea::focusOutEvent(e);
 596 }
 597
 598
 599 void GuiWorkArea::mousePressEvent(QMouseEvent * e)
 600 {
 601         if (dc_event_.active && dc_event_ == *e) {
 602                 dc_event_.active = false;
 603                 FuncRequest cmd(LFUN_MOUSE_TRIPLE, e->x(), e->y(),
 604                         q_button_state(e->button()));
 605                 dispatch(cmd);
 606                 e->accept();
 607                 return;
 608         }
 609
 610         inputContext()->reset();
 611
 612         FuncRequest const cmd(LFUN_MOUSE_PRESS, e->x(), e->y(),
 613                 q_button_state(e->button()));
 614         dispatch(cmd, q_key_state(e->modifiers()));
 615         e->accept();
 616 }
 617
 618
 619 void GuiWorkArea::mouseReleaseEvent(QMouseEvent * e)
 620 {
 621         if (synthetic_mouse_event_.timeout.running())
 622                 synthetic_mouse_event_.timeout.stop();
 623
 624         FuncRequest const cmd(LFUN_MOUSE_RELEASE, e->x(), e->y(),
 625                               q_button_state(e->button()));
 626         dispatch(cmd);
 627         e->accept();
 628 }
 629
 630
 631 void GuiWorkArea::mouseMoveEvent(QMouseEvent * e)
 632 {
 633         // we kill the triple click if we move
 634         doubleClickTimeout();
 635         FuncRequest cmd(LFUN_MOUSE_MOTION, e->x(), e->y(),
 636                 q_motion_state(e->buttons()));
 637
 638         e->accept();
 639
 640         // If we're above or below the work area...
 641         if (e->y() <= 20 || e->y() >= viewport()->height() - 20) {
 642                 // Make sure only a synthetic event can cause a page scroll,
 643                 // so they come at a steady rate:
 644                 if (e->y() <= 20)
 645                         // _Force_ a scroll up:
 646                         cmd.y = -40;
 647                 else
 648                         cmd.y = viewport()->height();
 649                 // Store the event, to be handled when the timeout expires.
 650                 synthetic_mouse_event_.cmd = cmd;
 651
 652                 if (synthetic_mouse_event_.timeout.running())
 653                         // Discard the event. Note that it _may_ be handled
 654                         // when the timeout expires if
 655                         // synthetic_mouse_event_.cmd has not been overwritten.
 656                         // Ie, when the timeout expires, we handle the
 657                         // most recent event but discard all others that
 658                         // occurred after the one used to start the timeout
 659                         // in the first place.
 660                         return;
 661
 662                 synthetic_mouse_event_.restart_timeout = true;
 663                 synthetic_mouse_event_.timeout.start();
 664                 // Fall through to handle this event...
 665
 666         } else if (synthetic_mouse_event_.timeout.running()) {
 667                 // Store the event, to be possibly handled when the timeout
 668                 // expires.
 669                 // Once the timeout has expired, normal control is returned
 670                 // to mouseMoveEvent (restart_timeout = false).
 671                 // This results in a much smoother 'feel' when moving the
 672                 // mouse back into the work area.
 673                 synthetic_mouse_event_.cmd = cmd;
 674                 synthetic_mouse_event_.restart_timeout = false;
 675                 return;
 676         }
 677
 678         // Has anything changed on-screen since the last QMouseEvent
 679         // was received?
 680         double const scrollbar_value = verticalScrollBar()->value();
 681         if (e->x() == synthetic_mouse_event_.x_old
 682                 && e->y() == synthetic_mouse_event_.y_old
 683                 && scrollbar_value == synthetic_mouse_event_.scrollbar_value_old) {
 684                 // Nothing changed on-screen since the last QMouseEvent.
 685                 return;
 686         }
 687
 688         // Yes something has changed. Store the params used to check this.
 689         synthetic_mouse_event_.x_old = e->x();
 690         synthetic_mouse_event_.y_old = e->y();
 691         synthetic_mouse_event_.scrollbar_value_old = scrollbar_value;
 692
 693         // ... and dispatch the event to the LyX core.
 694         dispatch(cmd);
 695 }
 696
 697
 698 void GuiWorkArea::wheelEvent(QWheelEvent * e)
 699 {
 700         // Wheel rotation by one notch results in a delta() of 120 (see
 701         // documentation of QWheelEvent)
 702         double const lines = qApp->wheelScrollLines()
 703                 * lyxrc.mouse_wheel_speed
 704                 * e->delta() / 120.0;
 705         LYXERR(Debug::SCROLLING, "wheelScrollLines = " << qApp->wheelScrollLines()
 706                 << " delta = " << e->delta()
 707                 << " lines = " << lines);
 708         verticalScrollBar()->setValue(verticalScrollBar()->value() -
 709                 int(lines *  verticalScrollBar()->singleStep()));
 710         e->accept();
 711 }
 712
 713
 714 void GuiWorkArea::generateSyntheticMouseEvent()
 715 {
 716         // Set things off to generate the _next_ 'pseudo' event.
 717         if (synthetic_mouse_event_.restart_timeout)
 718                 synthetic_mouse_event_.timeout.start();
 719
 720         // Has anything changed on-screen since the last timeout signal
 721         // was received?
 722         double const scrollbar_value = verticalScrollBar()->value();
 723         if (scrollbar_value != synthetic_mouse_event_.scrollbar_value_old) {
 724                 // Yes it has. Store the params used to check this.
 725                 synthetic_mouse_event_.scrollbar_value_old = scrollbar_value;
 726
 727                 // ... and dispatch the event to the LyX core.
 728                 dispatch(synthetic_mouse_event_.cmd);
 729         }
 730 }
 731
 732
 733 void GuiWorkArea::keyPressEvent(QKeyEvent * ev)
 734 {
 735         // intercept some keys if completion popup is visible
 736         if (completer_.popupVisible()) {
 737                 switch (ev->key()) {
 738                 case Qt::Key_Enter:
 739                 case Qt::Key_Return:
 740                         completer_.activate();
 741                         ev->accept();
 742                         return;
 743                 }
 744         }
 745
 746         // intercept keys for the completion
 747         if (ev->key() == Qt::Key_Tab) {
 748                 completer_.tab();
 749                 ev->accept();
 750                 return;
 751         }
 752
 753         if (completer_.popupVisible() && ev->key() == Qt::Key_Escape) {
 754                 completer_.hidePopup();
 755                 ev->accept();
 756                 return;
 757         }
 758
 759         if (completer_.inlineVisible() && ev->key() == Qt::Key_Escape) {
 760                 completer_.hideInline();
 761                 ev->accept();
 762                 return;
 763         }
 764
 765         // do nothing if there are other events
 766         // (the auto repeated events come too fast)
 767         // \todo FIXME: remove hard coded Qt keys, process the key binding
 768 #ifdef Q_WS_X11
 769         if (XEventsQueued(QX11Info::display(), 0) > 1 && ev->isAutoRepeat()
 770                         && (Qt::Key_PageDown || Qt::Key_PageUp)) {
 771                 LYXERR(Debug::KEY, "system is busy: scroll key event ignored");
 772                 ev->ignore();
 773                 return;
 774         }
 775 #endif
 776
 777         LYXERR(Debug::KEY, " count: " << ev->count()
 778                 << " text: " << fromqstr(ev->text())
 779                 << " isAutoRepeat: " << ev->isAutoRepeat() << " key: " << ev->key());
 780
 781         KeySymbol sym;
 782         setKeySymbol(&sym, ev);
 783         processKeySym(sym, q_key_state(ev->modifiers()));
 784         ev->accept();
 785 }
 786
 787
 788 void GuiWorkArea::doubleClickTimeout()
 789 {
 790         dc_event_.active = false;
 791 }
 792
 793
 794 void GuiWorkArea::mouseDoubleClickEvent(QMouseEvent * ev)
 795 {
 796         dc_event_ = DoubleClick(ev);
 797         QTimer::singleShot(QApplication::doubleClickInterval(), this,
 798                            SLOT(doubleClickTimeout()));
 799         FuncRequest cmd(LFUN_MOUSE_DOUBLE,
 800                         ev->x(), ev->y(),
 801                         q_button_state(ev->button()));
 802         dispatch(cmd);
 803         ev->accept();
 804 }
 805
 806
 807 void GuiWorkArea::resizeEvent(QResizeEvent * ev)
 808 {
 809         QAbstractScrollArea::resizeEvent(ev);
 810         need_resize_ = true;
 811         ev->accept();
 812 }
 813
 814
 815 void GuiWorkArea::update(int x, int y, int w, int h)
 816 {
 817         viewport()->repaint(x, y, w, h);
 818 }
 819
 820
 821 void GuiWorkArea::paintEvent(QPaintEvent * ev)
 822 {
 823         QRect const rc = ev->rect();
 824         // LYXERR(Debug::PAINTING, "paintEvent begin: x: " << rc.x()
 825         //      << " y: " << rc.y() << " w: " << rc.width() << " h: " << rc.height());
 826
 827         if (need_resize_) {
 828                 screen_ = QPixmap(viewport()->width(), viewport()->height());
 829                 resizeBufferView();
 830                 hideCursor();
 831                 showCursor();
 832         }
 833
 834         QPainter pain(viewport());
 835         pain.drawPixmap(rc, screen_, rc);
 836         cursor_->draw(pain);
 837         ev->accept();
 838 }
 839
 840
 841 void GuiWorkArea::updateScreen()
 842 {
 843         GuiPainter pain(&screen_);
 844         buffer_view_->draw(pain);
 845 }
 846
 847
 848 void GuiWorkArea::showCursor(int x, int y, int h, CursorShape shape)
 849 {
 850         if (schedule_redraw_) {
 851                 buffer_view_->updateMetrics();
 852                 updateScreen();
 853                 viewport()->update(QRect(0, 0, viewport()->width(), viewport()->height()));
 854                 schedule_redraw_ = false;
 855                 // Show the cursor immediately after the update.
 856                 hideCursor();
 857                 toggleCursor();
 858                 return;
 859         }
 860
 861         cursor_->update(x, y, h, shape);
 862         cursor_->show();
 863         viewport()->update(cursor_->rect());
 864 }
 865
 866
 867 void GuiWorkArea::removeCursor()
 868 {
 869         cursor_->hide();
 870         //if (!qApp->focusWidget())
 871                 viewport()->update(cursor_->rect());
 872 }
 873
 874
 875 void GuiWorkArea::inputMethodEvent(QInputMethodEvent * e)
 876 {
 877         QString const & commit_string = e->commitString();
 878         docstring const & preedit_string
 879                 = qstring_to_ucs4(e->preeditString());
 880
 881         if (!commit_string.isEmpty()) {
 882
 883                 LYXERR(Debug::KEY, "preeditString: " << fromqstr(e->preeditString())
 884                         << " commitString: " << fromqstr(e->commitString()));
 885
 886                 int key = 0;
 887
 888                 // FIXME Iwami 04/01/07: we should take care also of UTF16 surrogates here.
 889                 for (int i = 0; i != commit_string.size(); ++i) {
 890                         QKeyEvent ev(QEvent::KeyPress, key, Qt::NoModifier, commit_string[i]);
 891                         keyPressEvent(&ev);
 892                 }
 893         }
 894
 895         // Hide the cursor during the kana-kanji transformation.
 896         if (preedit_string.empty())
 897                 startBlinkingCursor();
 898         else
 899                 stopBlinkingCursor();
 900
 901         // last_width : for checking if last preedit string was/wasn't empty.
 902         static bool last_width = false;
 903         if (!last_width && preedit_string.empty()) {
 904                 // if last_width is last length of preedit string.
 905                 e->accept();
 906                 return;
 907         }
 908
 909         GuiPainter pain(&screen_);
 910         buffer_view_->updateMetrics();
 911         buffer_view_->draw(pain);
 912         FontInfo font = buffer_view_->cursor().getFont().fontInfo();
 913         FontMetrics const & fm = theFontMetrics(font);
 914         int height = fm.maxHeight();
 915         int cur_x = cursor_->rect().left();
 916         int cur_y = cursor_->rect().bottom();
 917
 918         // redraw area of preedit string.
 919         update(0, cur_y - height, viewport()->width(),
 920                 (height + 1) * preedit_lines_);
 921
 922         if (preedit_string.empty()) {
 923                 last_width = false;
 924                 preedit_lines_ = 1;
 925                 e->accept();
 926                 return;
 927         }
 928         last_width = true;
 929
 930         // att : stores an IM attribute.
 931         QList<QInputMethodEvent::Attribute> const & att = e->attributes();
 932
 933         // get attributes of input method cursor.
 934         // cursor_pos : cursor position in preedit string.
 935         size_t cursor_pos = 0;
 936         bool cursor_is_visible = false;
 937         for (int i = 0; i != att.size(); ++i) {
 938                 if (att.at(i).type == QInputMethodEvent::Cursor) {
 939                         cursor_pos = att.at(i).start;
 940                         cursor_is_visible = att.at(i).length != 0;
 941                         break;
 942                 }
 943         }
 944
 945         size_t preedit_length = preedit_string.length();
 946
 947         // get position of selection in input method.
 948         // FIXME: isn't there a way to do this simplier?
 949         // rStart : cursor position in selected string in IM.
 950         size_t rStart = 0;
 951         // rLength : selected string length in IM.
 952         size_t rLength = 0;
 953         if (cursor_pos < preedit_length) {
 954                 for (int i = 0; i != att.size(); ++i) {
 955                         if (att.at(i).type == QInputMethodEvent::TextFormat) {
 956                                 if (att.at(i).start <= int(cursor_pos)
 957                                         && int(cursor_pos) < att.at(i).start + att.at(i).length) {
 958                                                 rStart = att.at(i).start;
 959                                                 rLength = att.at(i).length;
 960                                                 if (!cursor_is_visible)
 961                                                         cursor_pos += rLength;
 962                                                 break;
 963                                 }
 964                         }
 965                 }
 966         }
 967         else {
 968                 rStart = cursor_pos;
 969                 rLength = 0;
 970         }
 971
 972         int const right_margin = buffer_view_->rightMargin();
 973         Painter::preedit_style ps;
 974         // Most often there would be only one line:
 975         preedit_lines_ = 1;
 976         for (size_t pos = 0; pos != preedit_length; ++pos) {
 977                 char_type const typed_char = preedit_string[pos];
 978                 // reset preedit string style
 979                 ps = Painter::preedit_default;
 980
 981                 // if we reached the right extremity of the screen, go to next line.
 982                 if (cur_x + fm.width(typed_char) > viewport()->width() - right_margin) {
 983                         cur_x = right_margin;
 984                         cur_y += height + 1;
 985                         ++preedit_lines_;
 986                 }
 987                 // preedit strings are displayed with dashed underline
 988                 // and partial strings are displayed white on black indicating
 989                 // that we are in selecting mode in the input method.
 990                 // FIXME: rLength == preedit_length is not a changing condition
 991                 // FIXME: should be put out of the loop.
 992                 if (pos >= rStart
 993                         && pos < rStart + rLength
 994                         && !(cursor_pos < rLength && rLength == preedit_length))
 995                         ps = Painter::preedit_selecting;
 996
 997                 if (pos == cursor_pos
 998                         && (cursor_pos < rLength && rLength == preedit_length))
 999                         ps = Painter::preedit_cursor;
1000
1001                 // draw one character and update cur_x.
1002                 cur_x += pain.preeditText(cur_x, cur_y, typed_char, font, ps);
1003         }
1004
1005         // update the preedit string screen area.
1006         update(0, cur_y - preedit_lines_*height, viewport()->width(),
1007                 (height + 1) * preedit_lines_);
1008
1009         // Don't forget to accept the event!
1010         e->accept();
1011 }
1012
1013
1014 QVariant GuiWorkArea::inputMethodQuery(Qt::InputMethodQuery query) const
1015 {
1016         QRect cur_r(0,0,0,0);
1017         switch (query) {
1018                 // this is the CJK-specific composition window position.
1019                 case Qt::ImMicroFocus:
1020                         cur_r = cursor_->rect();
1021                         if (preedit_lines_ != 1)
1022                                 cur_r.moveLeft(10);
1023                         cur_r.moveBottom(cur_r.bottom() + cur_r.height() * preedit_lines_);
1024                         // return lower right of cursor in LyX.
1025                         return cur_r;
1026                 default:
1027                         return QWidget::inputMethodQuery(query);
1028         }
1029 }
1030
1031
1032 void GuiWorkArea::updateWindowTitle()
1033 {
1034         docstring maximize_title;
1035         docstring minimize_title;
1036
1037         Buffer & buf = buffer_view_->buffer();
1038         FileName const fileName = buf.fileName();
1039         if (!fileName.empty()) {
1040                 maximize_title = fileName.displayName(30);
1041                 minimize_title = from_utf8(fileName.onlyFileName());
1042                 if (!buf.isClean()) {
1043                         maximize_title += _(" (changed)");
1044                         minimize_title += char_type('*');
1045                 }
1046                 if (buf.isReadonly())
1047                         maximize_title += _(" (read only)");
1048         }
1049
1050         QString title = windowTitle();
1051         QString new_title = toqstr(maximize_title);
1052         if (title == new_title)
1053                 return;
1054
1055         QWidget::setWindowTitle(new_title);
1056         QWidget::setWindowIconText(toqstr(minimize_title));
1057         titleChanged(this);
1058 }
1059
1060
1061 void GuiWorkArea::setReadOnly(bool)
1062 {
1063         updateWindowTitle();
1064         if (this == lyx_view_->currentWorkArea())
1065                 lyx_view_->updateBufferDependent(false);
1066 }
1067
1068
1069 ////////////////////////////////////////////////////////////////////
1070 //
1071 // TabWorkArea
1072 //
1073 ////////////////////////////////////////////////////////////////////
1074
1075 TabWorkArea::TabWorkArea(QWidget * parent) : QTabWidget(parent)
1076 {
1077         QPalette pal = palette();
1078         pal.setColor(QPalette::Active, QPalette::Button,
1079                 pal.color(QPalette::Active, QPalette::Window));
1080         pal.setColor(QPalette::Disabled, QPalette::Button,
1081                 pal.color(QPalette::Disabled, QPalette::Window));
1082         pal.setColor(QPalette::Inactive, QPalette::Button,
1083                 pal.color(QPalette::Inactive, QPalette::Window));
1084
1085         QObject::connect(this, SIGNAL(currentChanged(int)),
1086                 this, SLOT(on_currentTabChanged(int)));
1087
1088         QToolButton * closeBufferButton = new QToolButton(this);
1089     closeBufferButton->setPalette(pal);
1090         // FIXME: rename the icon to closebuffer.png
1091         closeBufferButton->setIcon(QIcon(":/images/closetab.png"));
1092         closeBufferButton->setText("Close File");
1093         closeBufferButton->setAutoRaise(true);
1094         closeBufferButton->setCursor(Qt::ArrowCursor);
1095         closeBufferButton->setToolTip(qt_("Close File"));
1096         closeBufferButton->setEnabled(true);
1097         QObject::connect(closeBufferButton, SIGNAL(clicked()),
1098                 this, SLOT(closeCurrentBuffer()));
1099         setCornerWidget(closeBufferButton, Qt::TopRightCorner);
1100
1101         QToolButton * closeTabButton = new QToolButton(this);
1102     closeTabButton->setPalette(pal);
1103         closeTabButton->setIcon(QIcon(":/images/hidetab.png"));
1104         closeTabButton->setText("Hide tab");
1105         closeTabButton->setAutoRaise(true);
1106         closeTabButton->setCursor(Qt::ArrowCursor);
1107         closeTabButton->setToolTip(qt_("Hide tab"));
1108         closeTabButton->setEnabled(true);
1109         QObject::connect(closeTabButton, SIGNAL(clicked()),
1110                 this, SLOT(closeCurrentTab()));
1111         setCornerWidget(closeTabButton, Qt::TopLeftCorner);
1112
1113         setUsesScrollButtons(true);
1114 }
1115
1116
1117 void TabWorkArea::setFullScreen(bool full_screen)
1118 {
1119         for (int i = 0; i != count(); ++i) {
1120                 if (GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i)))
1121                         wa->setFullScreen(full_screen);
1122         }
1123
1124         if (lyxrc.full_screen_tabbar)
1125                 showBar(!full_screen && count()>1);
1126 }
1127
1128
1129 void TabWorkArea::showBar(bool show)
1130 {
1131         tabBar()->setEnabled(show);
1132         tabBar()->setVisible(show);
1133 }
1134
1135
1136 GuiWorkArea * TabWorkArea::currentWorkArea()
1137 {
1138         if (count() == 0)
1139                 return 0;
1140
1141         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(currentWidget());
1142         BOOST_ASSERT(wa);
1143         return wa;
1144 }
1145
1146
1147 GuiWorkArea * TabWorkArea::workArea(Buffer & buffer)
1148 {
1149         for (int i = 0; i != count(); ++i) {
1150                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i));
1151                 BOOST_ASSERT(wa);
1152                 if (&wa->bufferView().buffer() == &buffer)
1153                         return wa;
1154         }
1155         return 0;
1156 }
1157
1158
1159 void TabWorkArea::closeAll()
1160 {
1161         while (count()) {
1162                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(0));
1163                 BOOST_ASSERT(wa);
1164                 removeTab(0);
1165                 delete wa;
1166         }
1167 }
1168
1169
1170 bool TabWorkArea::setCurrentWorkArea(GuiWorkArea * work_area)
1171 {
1172         BOOST_ASSERT(work_area);
1173         int index = indexOf(work_area);
1174         if (index == -1)
1175                 return false;
1176
1177         if (index == currentIndex())
1178                 // Make sure the work area is up to date.
1179                 on_currentTabChanged(index);
1180         else
1181                 // Switch to the work area.
1182                 setCurrentIndex(index);
1183         work_area->setFocus();
1184
1185         return true;
1186 }
1187
1188
1189 GuiWorkArea * TabWorkArea::addWorkArea(Buffer & buffer, GuiView & view)
1190 {
1191         GuiWorkArea * wa = new GuiWorkArea(buffer, view);
1192         wa->setUpdatesEnabled(false);
1193         // Hide tabbar if there's no tab (avoid a resize and a flashing tabbar
1194         // when hiding it again below).
1195         showBar(count() > 0);
1196         addTab(wa, wa->windowTitle());
1197         QObject::connect(wa, SIGNAL(titleChanged(GuiWorkArea *)),
1198                 this, SLOT(updateTabText(GuiWorkArea *)));
1199         // Hide tabbar if there's only one tab.
1200         showBar(count() > 1);
1201         return wa;
1202 }
1203
1204
1205 bool TabWorkArea::removeWorkArea(GuiWorkArea * work_area)
1206 {
1207         BOOST_ASSERT(work_area);
1208         int index = indexOf(work_area);
1209         if (index == -1)
1210                 return false;
1211
1212         work_area->setUpdatesEnabled(false);
1213         removeTab(index);
1214         delete work_area;
1215
1216         if (count()) {
1217                 // make sure the next work area is enabled.
1218                 currentWidget()->setUpdatesEnabled(true);
1219                 // Hide tabbar if there's only one tab.
1220                 showBar(count() > 1);
1221         }
1222         return true;
1223 }
1224
1225
1226 void TabWorkArea::on_currentTabChanged(int i)
1227 {
1228         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i));
1229         BOOST_ASSERT(wa);
1230         BufferView & bv = wa->bufferView();
1231         bv.cursor().fixIfBroken();
1232         bv.updateMetrics();
1233         wa->setUpdatesEnabled(true);
1234         wa->redraw();
1235         wa->setFocus();
1236         ///
1237         currentWorkAreaChanged(wa);
1238
1239         LYXERR(Debug::GUI, "currentTabChanged " << i
1240                 << "File" << bv.buffer().absFileName());
1241 }
1242
1243
1244 void TabWorkArea::closeCurrentBuffer()
1245 {
1246         lyx::dispatch(FuncRequest(LFUN_BUFFER_CLOSE));
1247 }
1248
1249
1250 void TabWorkArea::closeCurrentTab()
1251 {
1252         removeWorkArea(currentWorkArea());
1253 }
1254
1255
1256 void TabWorkArea::updateTabText(GuiWorkArea * wa)
1257 {
1258         int const i = indexOf(wa);
1259         if (i < 0)
1260                 return;
1261         setTabText(i, wa->windowTitle());
1262 }
1263
1264 } // namespace frontend
1265 } // namespace lyx
1266
1267 #include "GuiWorkArea_moc.cpp"