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         connect(&cursor_timeout_, SIGNAL(timeout()),
 201                 this, SLOT(toggleCursor()));
 202
 203         int const time = QApplication::cursorFlashTime() / 2;
 204         if (time > 0) {
 205                 cursor_timeout_.setInterval(time);
 206                 cursor_timeout_.start();
 207         } else
 208                 // let's initialize this just to be safe
 209                 cursor_timeout_.setInterval(500);
 210
 211         general_timer_.setInterval(500);
 212         connect(&general_timer_, SIGNAL(timeout()),
 213                 this, SLOT(handleRegularEvents()));
 214         startGeneralTimer();
 215
 216         screen_ = QPixmap(viewport()->width(), viewport()->height());
 217         cursor_ = new frontend::CursorWidget();
 218         cursor_->hide();
 219
 220         setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 221         setAcceptDrops(true);
 222         setMouseTracking(true);
 223         setMinimumSize(100, 70);
 224         updateWindowTitle();
 225
 226         viewport()->setAutoFillBackground(false);
 227         // We don't need double-buffering nor SystemBackground on
 228         // the viewport because we have our own backing pixmap.
 229         viewport()->setAttribute(Qt::WA_NoSystemBackground);
 230
 231         setFocusPolicy(Qt::WheelFocus);
 232
 233         viewport()->setCursor(Qt::IBeamCursor);
 234
 235         synthetic_mouse_event_.timeout.timeout.connect(
 236                 boost::bind(&GuiWorkArea::generateSyntheticMouseEvent,
 237                                         this));
 238
 239         // Initialize the vertical Scroll Bar
 240         QObject::connect(verticalScrollBar(), SIGNAL(valueChanged(int)),
 241                 this, SLOT(scrollTo(int)));
 242
 243         LYXERR(Debug::GUI, "viewport width: " << viewport()->width()
 244                 << "  viewport height: " << viewport()->height());
 245
 246         // Enables input methods for asian languages.
 247         // Must be set when creating custom text editing widgets.
 248         setAttribute(Qt::WA_InputMethodEnabled, true);
 249 }
 250
 251
 252
 253 GuiWorkArea::~GuiWorkArea()
 254 {
 255         buffer_view_->buffer().workAreaManager().remove(this);
 256         delete buffer_view_;
 257         delete cursor_;
 258 }
 259
 260
 261 void GuiWorkArea::close()
 262 {
 263         lyx_view_->removeWorkArea(this);
 264 }
 265
 266
 267 BufferView & GuiWorkArea::bufferView()
 268 {
 269         return *buffer_view_;
 270 }
 271
 272
 273 BufferView const & GuiWorkArea::bufferView() const
 274 {
 275         return *buffer_view_;
 276 }
 277
 278
 279 void GuiWorkArea::stopBlinkingCursor()
 280 {
 281         cursor_timeout_.stop();
 282         hideCursor();
 283 }
 284
 285
 286 void GuiWorkArea::startBlinkingCursor()
 287 {
 288         showCursor();
 289         //we're not supposed to cache this value.
 290         int const time = QApplication::cursorFlashTime() / 2;
 291         if (time <= 0)
 292                 return;
 293         cursor_timeout_.setInterval(time);
 294         cursor_timeout_.start();
 295 }
 296
 297
 298 void GuiWorkArea::redraw()
 299 {
 300         if (!isVisible())
 301                 // No need to redraw in this case.
 302                 return;
 303
 304         // No need to do anything if this is the current view. The BufferView
 305         // metrics are already up to date.
 306         if (lyx_view_ != guiApp->currentView()) {
 307                 // FIXME: it would be nice to optimize for the off-screen case.
 308                 buffer_view_->updateMetrics();
 309                 buffer_view_->cursor().fixIfBroken();
 310         }
 311
 312         // update cursor position, because otherwise it has to wait until
 313         // the blinking interval is over
 314         if (cursor_visible_) {
 315                 hideCursor();
 316                 showCursor();
 317         }
 318
 319         LYXERR(Debug::WORKAREA, "WorkArea::redraw screen");
 320         updateScreen();
 321         update(0, 0, viewport()->width(), viewport()->height());
 322
 323         /// \warning: scrollbar updating *must* be done after the BufferView is drawn
 324         /// because \c BufferView::updateScrollbar() is called in \c BufferView::draw().
 325         updateScrollbar();
 326         lyx_view_->updateStatusBar();
 327
 328         if (lyxerr.debugging(Debug::WORKAREA))
 329                 buffer_view_->coordCache().dump();
 330 }
 331
 332
 333 void GuiWorkArea::processKeySym(KeySymbol const & key, KeyModifier mod)
 334 {
 335         // In order to avoid bad surprise in the middle of an operation,
 336         // we better stop the blinking cursor...
 337         stopBlinkingCursor();
 338         // ...and the general timer.
 339         stopGeneralTimer();
 340
 341         theLyXFunc().setLyXView(lyx_view_);
 342         theLyXFunc().processKeySym(key, mod);
 343
 344         // the cursor gets restarted in GuiView::restartCursor()
 345         startGeneralTimer();
 346 }
 347
 348
 349 void GuiWorkArea::dispatch(FuncRequest const & cmd0, KeyModifier mod)
 350 {
 351         // Handle drag&drop
 352         if (cmd0.action == LFUN_FILE_OPEN) {
 353                 lyx_view_->dispatch(cmd0);
 354                 return;
 355         }
 356
 357         theLyXFunc().setLyXView(lyx_view_);
 358
 359         FuncRequest cmd;
 360
 361         if (cmd0.action == LFUN_MOUSE_PRESS) {
 362                 if (mod == ShiftModifier)
 363                         cmd = FuncRequest(cmd0, "region-select");
 364                 else if (mod == ControlModifier)
 365                         cmd = FuncRequest(cmd0, "paragraph-select");
 366                 else
 367                         cmd = cmd0;
 368         }
 369         else
 370                 cmd = cmd0;
 371
 372         bool const notJustMovingTheMouse =
 373                 cmd.action != LFUN_MOUSE_MOTION || cmd.button() != mouse_button::none;
 374
 375         // In order to avoid bad surprise in the middle of an operation, we better stop
 376         // the blinking cursor and the general timer
 377         if (notJustMovingTheMouse) {
 378                 stopBlinkingCursor();
 379                 stopGeneralTimer();
 380         }
 381
 382         buffer_view_->mouseEventDispatch(cmd);
 383
 384         // Skip these when selecting
 385         if (cmd.action != LFUN_MOUSE_MOTION) {
 386                 lyx_view_->updateLayoutList();
 387                 lyx_view_->updateToolbars();
 388         }
 389
 390         // GUI tweaks except with mouse motion with no button pressed.
 391         if (notJustMovingTheMouse) {
 392                 // Slight hack: this is only called currently when we
 393                 // clicked somewhere, so we force through the display
 394                 // of the new status here.
 395                 lyx_view_->clearMessage();
 396
 397                 // Show the cursor immediately after any operation
 398                 startBlinkingCursor();
 399                 startGeneralTimer();
 400         }
 401 }
 402
 403
 404 void GuiWorkArea::resizeBufferView()
 405 {
 406         // WARNING: Please don't put any code that will trigger a repaint here!
 407         // We are already inside a paint event.
 408         lyx_view_->setBusy(true);
 409         buffer_view_->resize(viewport()->width(), viewport()->height());
 410         lyx_view_->updateLayoutList();
 411         lyx_view_->setBusy(false);
 412         need_resize_ = false;
 413 }
 414
 415
 416 void GuiWorkArea::showCursor()
 417 {
 418         if (cursor_visible_)
 419                 return;
 420
 421         CursorShape shape = BAR_SHAPE;
 422
 423         Font const & realfont = buffer_view_->cursor().real_current_font;
 424         BufferParams const & bp = buffer_view_->buffer().params();
 425         bool const samelang = realfont.language() == bp.language;
 426         bool const isrtl = realfont.isVisibleRightToLeft();
 427
 428         if (!samelang || isrtl != bp.language->rightToLeft()) {
 429                 shape = L_SHAPE;
 430                 if (isrtl)
 431                         shape = REVERSED_L_SHAPE;
 432         }
 433
 434         // The ERT language hack needs fixing up
 435         if (realfont.language() == latex_language)
 436                 shape = BAR_SHAPE;
 437
 438         Font const font = buffer_view_->cursor().getFont();
 439         FontMetrics const & fm = theFontMetrics(font);
 440         int const asc = fm.maxAscent();
 441         int const des = fm.maxDescent();
 442         int h = asc + des;
 443         int x = 0;
 444         int y = 0;
 445         buffer_view_->cursor().getPos(x, y);
 446         y -= asc;
 447
 448         // if it doesn't touch the screen, don't try to show it
 449         if (y + h < 0 || y >= viewport()->height())
 450                 return;
 451
 452         cursor_visible_ = true;
 453         showCursor(x, y, h, shape);
 454 }
 455
 456
 457 void GuiWorkArea::hideCursor()
 458 {
 459         if (!cursor_visible_)
 460                 return;
 461
 462         cursor_visible_ = false;
 463         removeCursor();
 464 }
 465
 466
 467 void GuiWorkArea::toggleCursor()
 468 {
 469         if (cursor_visible_)
 470                 hideCursor();
 471         else
 472                 showCursor();
 473 }
 474
 475
 476 void GuiWorkArea::handleRegularEvents()
 477 {
 478         ForkedCallsController::handleCompletedProcesses();
 479 }
 480
 481
 482 void GuiWorkArea::updateScrollbar()
 483 {
 484         ScrollbarParameters const & scroll_ = buffer_view_->scrollbarParameters();
 485
 486         verticalScrollBar()->setRange(scroll_.min, scroll_.max);
 487         verticalScrollBar()->setPageStep(scroll_.page_step);
 488         verticalScrollBar()->setSingleStep(scroll_.single_step);
 489         // Block the scrollbar signal to prevent recursive signal/slot calling.
 490         verticalScrollBar()->blockSignals(true);
 491         verticalScrollBar()->setValue(scroll_.position);
 492         verticalScrollBar()->setSliderPosition(scroll_.position);
 493         verticalScrollBar()->blockSignals(false);
 494 }
 495
 496
 497 void GuiWorkArea::scrollTo(int value)
 498 {
 499         stopBlinkingCursor();
 500         buffer_view_->scrollDocView(value);
 501
 502         if (lyxrc.cursor_follows_scrollbar) {
 503                 buffer_view_->setCursorFromScrollbar();
 504                 lyx_view_->updateLayoutList();
 505         }
 506         // Show the cursor immediately after any operation.
 507         startBlinkingCursor();
 508         QApplication::syncX();
 509 }
 510
 511
 512 bool GuiWorkArea::event(QEvent * e)
 513 {
 514         switch (e->type()) {
 515         case QEvent::ToolTip: {
 516                 QHelpEvent * helpEvent = static_cast<QHelpEvent *>(e);
 517                 if (lyxrc.use_tooltip) {
 518                         QPoint pos = helpEvent->pos();
 519                         if (pos.x() < viewport()->width()) {
 520                                 QString s = toqstr(buffer_view_->toolTip(pos.x(), pos.y()));
 521                                 QToolTip::showText(helpEvent->globalPos(), s);
 522                         }
 523                         else
 524                                 QToolTip::hideText();
 525                 }
 526                 // Don't forget to accept the event!
 527                 e->accept();
 528                 return true;
 529         }
 530
 531         case QEvent::ShortcutOverride: {
 532                 // We catch this event in order to catch the Tab or Shift+Tab key press
 533                 // which are otherwise reserved to focus switching between controls
 534                 // within a dialog.
 535                 QKeyEvent * ke = static_cast<QKeyEvent*>(e);
 536                 if ((ke->key() != Qt::Key_Tab && ke->key() != Qt::Key_Backtab)
 537                         || ke->modifiers() & Qt::ControlModifier)
 538                         return QAbstractScrollArea::event(e);
 539                 keyPressEvent(ke);
 540                 return true;
 541         }
 542
 543         default:
 544                 return QAbstractScrollArea::event(e);
 545         }
 546         return false;
 547 }
 548
 549
 550 void GuiWorkArea::contextMenuEvent(QContextMenuEvent * e)
 551 {
 552         QPoint pos = e->pos();
 553         docstring name = buffer_view_->contextMenu(pos.x(), pos.y());
 554         if (name.empty()) {
 555                 QAbstractScrollArea::contextMenuEvent(e);
 556                 return;
 557         }
 558         QMenu * menu = guiApp->menus().menu(toqstr(name));
 559         if (!menu) {
 560                 QAbstractScrollArea::contextMenuEvent(e);
 561                 return;
 562         }
 563         // Position the menu to the right.
 564         // FIXME: menu position should be different for RTL text.
 565         pos.rx() += menu->width();
 566         // FIXME: correct vertical position of the menu WRT screen espace.
 567         //pos.ry() += menu->height();
 568         menu->exec(pos);
 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                 else {
 648                         synthetic_mouse_event_.restart_timeout = true;
 649                         synthetic_mouse_event_.timeout.start();
 650                         // Fall through to handle this event...
 651                 }
 652
 653         } else if (synthetic_mouse_event_.timeout.running()) {
 654                 // Store the event, to be possibly handled when the timeout
 655                 // expires.
 656                 // Once the timeout has expired, normal control is returned
 657                 // to mouseMoveEvent (restart_timeout = false).
 658                 // This results in a much smoother 'feel' when moving the
 659                 // mouse back into the work area.
 660                 synthetic_mouse_event_.cmd = cmd;
 661                 synthetic_mouse_event_.restart_timeout = false;
 662                 return;
 663         }
 664
 665         // Has anything changed on-screen since the last QMouseEvent
 666         // was received?
 667         double const scrollbar_value = verticalScrollBar()->value();
 668         if (e->x() != synthetic_mouse_event_.x_old ||
 669             e->y() != synthetic_mouse_event_.y_old ||
 670             scrollbar_value != synthetic_mouse_event_.scrollbar_value_old) {
 671                 // Yes it has. Store the params used to check this.
 672                 synthetic_mouse_event_.x_old = e->x();
 673                 synthetic_mouse_event_.y_old = e->y();
 674                 synthetic_mouse_event_.scrollbar_value_old = scrollbar_value;
 675
 676                 // ... and dispatch the event to the LyX core.
 677                 dispatch(cmd);
 678         }
 679 }
 680
 681
 682 void GuiWorkArea::wheelEvent(QWheelEvent * e)
 683 {
 684         // Wheel rotation by one notch results in a delta() of 120 (see
 685         // documentation of QWheelEvent)
 686         double const lines = qApp->wheelScrollLines()
 687                 * lyxrc.mouse_wheel_speed
 688                 * e->delta() / 120.0;
 689         lyxerr << "wheelScrollLines = " << qApp->wheelScrollLines()
 690                 << " delta = " << e->delta()
 691                 << " lines = " << lines
 692                 << std::endl;
 693         verticalScrollBar()->setValue(verticalScrollBar()->value() -
 694                 int(lines *  verticalScrollBar()->singleStep()));
 695 }
 696
 697
 698 void GuiWorkArea::generateSyntheticMouseEvent()
 699 {
 700 // Set things off to generate the _next_ 'pseudo' event.
 701         if (synthetic_mouse_event_.restart_timeout)
 702                 synthetic_mouse_event_.timeout.start();
 703
 704         // Has anything changed on-screen since the last timeout signal
 705         // was received?
 706         double const scrollbar_value = verticalScrollBar()->value();
 707         if (scrollbar_value != synthetic_mouse_event_.scrollbar_value_old) {
 708                 // Yes it has. Store the params used to check this.
 709                 synthetic_mouse_event_.scrollbar_value_old = scrollbar_value;
 710
 711                 // ... and dispatch the event to the LyX core.
 712                 dispatch(synthetic_mouse_event_.cmd);
 713         }
 714 }
 715
 716
 717 void GuiWorkArea::keyPressEvent(QKeyEvent * ev)
 718 {
 719         // do nothing if there are other events
 720         // (the auto repeated events come too fast)
 721         // \todo FIXME: remove hard coded Qt keys, process the key binding
 722 #ifdef Q_WS_X11
 723         if (XEventsQueued(QX11Info::display(), 0) > 1 && ev->isAutoRepeat()
 724                         && (Qt::Key_PageDown || Qt::Key_PageUp)) {
 725                 LYXERR(Debug::KEY, "system is busy: scroll key event ignored");
 726                 ev->ignore();
 727                 return;
 728         }
 729 #endif
 730
 731         LYXERR(Debug::KEY, " count: " << ev->count()
 732                 << " text: " << fromqstr(ev->text())
 733                 << " isAutoRepeat: " << ev->isAutoRepeat() << " key: " << ev->key());
 734
 735         KeySymbol sym;
 736         setKeySymbol(&sym, ev);
 737         processKeySym(sym, q_key_state(ev->modifiers()));
 738         ev->accept();
 739 }
 740
 741
 742 void GuiWorkArea::doubleClickTimeout()
 743 {
 744         dc_event_.active = false;
 745 }
 746
 747
 748 void GuiWorkArea::mouseDoubleClickEvent(QMouseEvent * ev)
 749 {
 750         dc_event_ = DoubleClick(ev);
 751         QTimer::singleShot(QApplication::doubleClickInterval(), this,
 752                            SLOT(doubleClickTimeout()));
 753         FuncRequest cmd(LFUN_MOUSE_DOUBLE,
 754                         ev->x(), ev->y(),
 755                         q_button_state(ev->button()));
 756         dispatch(cmd);
 757 }
 758
 759
 760 void GuiWorkArea::resizeEvent(QResizeEvent * ev)
 761 {
 762         QAbstractScrollArea::resizeEvent(ev);
 763         need_resize_ = true;
 764 }
 765
 766
 767 void GuiWorkArea::update(int x, int y, int w, int h)
 768 {
 769         viewport()->repaint(x, y, w, h);
 770 }
 771
 772
 773 void GuiWorkArea::paintEvent(QPaintEvent * ev)
 774 {
 775         QRect const rc = ev->rect();
 776         // LYXERR(Debug::PAINTING, "paintEvent begin: x: " << rc.x()
 777         //      << " y: " << rc.y() << " w: " << rc.width() << " h: " << rc.height());
 778
 779         if (need_resize_) {
 780                 screen_ = QPixmap(viewport()->width(), viewport()->height());
 781                 resizeBufferView();
 782                 updateScreen();
 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 = 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::showBar(bool show)
1057 {
1058         tabBar()->setEnabled(show);
1059         tabBar()->setVisible(show);
1060 }
1061
1062
1063 GuiWorkArea * TabWorkArea::currentWorkArea()
1064 {
1065         if (count() == 0)
1066                 return 0;
1067
1068         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(currentWidget());
1069         BOOST_ASSERT(wa);
1070         return wa;
1071 }
1072
1073
1074 GuiWorkArea * TabWorkArea::workArea(Buffer & buffer)
1075 {
1076         for (int i = 0; i != count(); ++i) {
1077                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i));
1078                 BOOST_ASSERT(wa);
1079                 if (&wa->bufferView().buffer() == &buffer)
1080                         return wa;
1081         }
1082         return 0;
1083 }
1084
1085
1086 void TabWorkArea::closeAll()
1087 {
1088         while (count()) {
1089                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(0));
1090                 BOOST_ASSERT(wa);
1091                 removeTab(0);
1092                 delete wa;
1093         }
1094 }
1095
1096
1097 bool TabWorkArea::setCurrentWorkArea(GuiWorkArea * work_area)
1098 {
1099         BOOST_ASSERT(work_area);
1100         int index = indexOf(work_area);
1101         if (index == -1)
1102                 return false;
1103
1104         if (index == currentIndex())
1105                 // Make sure the work area is up to date.
1106                 on_currentTabChanged(index);
1107         else
1108                 // Switch to the work area.
1109                 setCurrentIndex(index);
1110         work_area->setFocus();
1111
1112         return true;
1113 }
1114
1115
1116 GuiWorkArea * TabWorkArea::addWorkArea(Buffer & buffer, GuiView & view)
1117 {
1118         GuiWorkArea * wa = new GuiWorkArea(buffer, view);
1119         wa->setUpdatesEnabled(false);
1120         // Hide tabbar if there's no tab (avoid a resize and a flashing tabbar
1121         // when hiding it again below).
1122         showBar(count() > 0);
1123         addTab(wa, wa->windowTitle());
1124         QObject::connect(wa, SIGNAL(titleChanged(GuiWorkArea *)),
1125                 this, SLOT(updateTabText(GuiWorkArea *)));
1126         // Hide tabbar if there's only one tab.
1127         showBar(count() > 1);
1128         return wa;
1129 }
1130
1131
1132 bool TabWorkArea::removeWorkArea(GuiWorkArea * work_area)
1133 {
1134         BOOST_ASSERT(work_area);
1135         int index = indexOf(work_area);
1136         if (index == -1)
1137                 return false;
1138
1139         work_area->setUpdatesEnabled(false);
1140         removeTab(index);
1141         delete work_area;
1142
1143         if (count()) {
1144                 // make sure the next work area is enabled.
1145                 currentWidget()->setUpdatesEnabled(true);
1146                 // Hide tabbar if there's only one tab.
1147                 showBar(count() > 1);
1148         }
1149         return true;
1150 }
1151
1152
1153 void TabWorkArea::on_currentTabChanged(int i)
1154 {
1155         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i));
1156         BOOST_ASSERT(wa);
1157         BufferView & bv = wa->bufferView();
1158         bv.cursor().fixIfBroken();
1159         bv.updateMetrics();
1160         wa->setUpdatesEnabled(true);
1161         wa->redraw();
1162         wa->setFocus();
1163         ///
1164         currentWorkAreaChanged(wa);
1165
1166         LYXERR(Debug::GUI, "currentTabChanged " << i
1167                 << "File" << bv.buffer().absFileName());
1168 }
1169
1170
1171 void TabWorkArea::closeCurrentTab()
1172 {
1173         lyx::dispatch(FuncRequest(LFUN_BUFFER_CLOSE));
1174 }
1175
1176
1177 void TabWorkArea::updateTabText(GuiWorkArea * wa)
1178 {
1179         int const i = indexOf(wa);
1180         if (i < 0)
1181                 return;
1182         setTabText(i, wa->windowTitle());
1183 }
1184
1185 } // namespace frontend
1186 } // namespace lyx
1187
1188 #include "GuiWorkArea_moc.cpp"