src/frontends/qt4/GuiWorkArea.cpp

   1 /**
   2  * \file GuiWorkArea.cpp
   3  * This file is part of LyX, the document processor.
   4  * Licence details can be found in the file COPYING.
   5  *
   6  * \author John Levon
   7  * \author Abdelrazak Younes
   8  *
   9  * Full author contact details are available in file CREDITS.
  10  */
  11
  12 #include <config.h>
  13
  14 #include "GuiWorkArea.h"
  15
  16 #include "Buffer.h"
  17 #include "BufferParams.h"
  18 #include "BufferView.h"
  19 #include "CoordCache.h"
  20 #include "Cursor.h"
  21 #include "Font.h"
  22 #include "FuncRequest.h"
  23 #include "GuiApplication.h"
  24 #include "GuiKeySymbol.h"
  25 #include "GuiPainter.h"
  26 #include "GuiPopupMenu.h"
  27 #include "GuiView.h"
  28 #include "KeySymbol.h"
  29 #include "Language.h"
  30 #include "LyXFunc.h"
  31 #include "LyXRC.h"
  32 #include "MetricsInfo.h"
  33 #include "qt_helpers.h"
  34 #include "version.h"
  35
  36 #include "graphics/GraphicsImage.h"
  37 #include "graphics/GraphicsLoader.h"
  38
  39 #include "support/debug.h"
  40 #include "support/gettext.h"
  41 #include "support/FileName.h"
  42 #include "support/ForkedCalls.h"
  43
  44 #include "frontends/Application.h"
  45 #include "frontends/FontMetrics.h"
  46 #include "frontends/WorkAreaManager.h"
  47
  48 #include <QContextMenuEvent>
  49 #include <QInputContext>
  50 #include <QHelpEvent>
  51 #include <QLayout>
  52 #include <QMainWindow>
  53 #include <QPainter>
  54 #include <QPalette>
  55 #include <QScrollBar>
  56 #include <QTabBar>
  57 #include <QTimer>
  58 #include <QToolButton>
  59 #include <QToolTip>
  60
  61 #include <boost/bind.hpp>
  62
  63 #ifdef Q_WS_X11
  64 #include <QX11Info>
  65 extern "C" int XEventsQueued(Display *display, int mode);
  66 #endif
  67
  68 #ifdef Q_WS_WIN
  69 int const CursorWidth = 2;
  70 #else
  71 int const CursorWidth = 1;
  72 #endif
  73
  74 #undef KeyPress
  75 #undef NoModifier
  76
  77 using namespace std;
  78 using namespace lyx::support;
  79
  80 namespace lyx {
  81
  82
  83 /// return the LyX mouse button state from Qt's
  84 static mouse_button::state q_button_state(Qt::MouseButton button)
  85 {
  86         mouse_button::state b = mouse_button::none;
  87         switch (button) {
  88                 case Qt::LeftButton:
  89                         b = mouse_button::button1;
  90                         break;
  91                 case Qt::MidButton:
  92                         b = mouse_button::button2;
  93                         break;
  94                 case Qt::RightButton:
  95                         b = mouse_button::button3;
  96                         break;
  97                 default:
  98                         break;
  99         }
 100         return b;
 101 }
 102
 103
 104 /// return the LyX mouse button state from Qt's
 105 mouse_button::state q_motion_state(Qt::MouseButtons state)
 106 {
 107         mouse_button::state b = mouse_button::none;
 108         if (state & Qt::LeftButton)
 109                 b |= mouse_button::button1;
 110         if (state & Qt::MidButton)
 111                 b |= mouse_button::button2;
 112         if (state & Qt::RightButton)
 113                 b |= mouse_button::button3;
 114         return b;
 115 }
 116
 117
 118 namespace frontend {
 119
 120 class CursorWidget {
 121 public:
 122         CursorWidget() {}
 123
 124         void draw(QPainter & painter)
 125         {
 126                 if (show_ && rect_.isValid()) {
 127                         switch (shape_) {
 128                         case L_SHAPE:
 129                                 painter.fillRect(rect_.x(), rect_.y(), CursorWidth, rect_.height(), color_);
 130                                 painter.setPen(color_);
 131                                 painter.drawLine(rect_.bottomLeft().x() + CursorWidth, rect_.bottomLeft().y(),
 132                                                                                                  rect_.bottomRight().x(), rect_.bottomLeft().y());
 133                                 break;
 134
 135                         case REVERSED_L_SHAPE:
 136                                 painter.fillRect(rect_.x() + rect_.height() / 3, rect_.y(), CursorWidth, rect_.height(), color_);
 137                                 painter.setPen(color_);
 138                                 painter.drawLine(rect_.bottomRight().x() - CursorWidth, rect_.bottomLeft().y(),
 139                                                                                                          rect_.bottomLeft().x(), rect_.bottomLeft().y());
 140                                 break;
 141
 142                         default:
 143                                 painter.fillRect(rect_, color_);
 144                                 break;
 145                         }
 146                 }
 147         }
 148
 149         void update(int x, int y, int h, CursorShape shape)
 150         {
 151                 color_ = guiApp->colorCache().get(Color_cursor);
 152                 shape_ = shape;
 153                 switch (shape) {
 154                 case L_SHAPE:
 155                         rect_ = QRect(x, y, CursorWidth + h / 3, h);
 156                         break;
 157                 case REVERSED_L_SHAPE:
 158                         rect_ = QRect(x - h / 3, y, CursorWidth + h / 3, h);
 159                         break;
 160                 default:
 161                         rect_ = QRect(x, y, CursorWidth, h);
 162                         break;
 163                 }
 164         }
 165
 166         void show(bool set_show = true) { show_ = set_show; }
 167         void hide() { show_ = false; }
 168
 169         QRect const & rect() { return rect_; }
 170
 171 private:
 172         ///
 173         CursorShape shape_;
 174         ///
 175         bool show_;
 176         ///
 177         QColor color_;
 178         ///
 179         QRect rect_;
 180 };
 181
 182
 183 // This is a 'heartbeat' generating synthetic mouse move events when the
 184 // cursor is at the top or bottom edge of the viewport. One scroll per 0.2 s
 185 SyntheticMouseEvent::SyntheticMouseEvent()
 186         : timeout(200), restart_timeout(true),
 187           x_old(-1), y_old(-1), scrollbar_value_old(-1.0)
 188 {}
 189
 190
 191
 192 GuiWorkArea::GuiWorkArea(Buffer & buffer, GuiView & lv)
 193         : buffer_view_(new BufferView(buffer)), lyx_view_(&lv),
 194           cursor_visible_(false),
 195     need_resize_(false), schedule_redraw_(false),
 196                 preedit_lines_(1)
 197 {
 198         buffer.workAreaManager().add(this);
 199         // Setup the signals
 200         cursor_timeout_.setInterval(400);
 201         connect(&cursor_timeout_, SIGNAL(timeout()),
 202                 this, SLOT(toggleCursor()));
 203
 204         cursor_timeout_.start();
 205
 206         screen_ = QPixmap(viewport()->width(), viewport()->height());
 207         cursor_ = new frontend::CursorWidget();
 208         cursor_->hide();
 209
 210         setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
 211         setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 212         setAcceptDrops(true);
 213         setMouseTracking(true);
 214         setMinimumSize(100, 70);
 215         updateWindowTitle();
 216
 217         viewport()->setAutoFillBackground(false);
 218         // We don't need double-buffering nor SystemBackground on
 219         // the viewport because we have our own backing pixmap.
 220         viewport()->setAttribute(Qt::WA_NoSystemBackground);
 221
 222         setFocusPolicy(Qt::WheelFocus);
 223
 224         viewport()->setCursor(Qt::IBeamCursor);
 225
 226         synthetic_mouse_event_.timeout.timeout.connect(
 227                 boost::bind(&GuiWorkArea::generateSyntheticMouseEvent,
 228                                         this));
 229
 230         // Initialize the vertical Scroll Bar
 231         QObject::connect(verticalScrollBar(), SIGNAL(actionTriggered(int)),
 232                 this, SLOT(adjustViewWithScrollBar(int)));
 233
 234         // disable context menu for the scrollbar
 235         verticalScrollBar()->setContextMenuPolicy(Qt::NoContextMenu);
 236
 237         // PageStep only depends on the viewport height.
 238         verticalScrollBar()->setPageStep(viewport()->height());
 239
 240         LYXERR(Debug::GUI, "viewport width: " << viewport()->width()
 241                 << "  viewport height: " << viewport()->height());
 242
 243         // Enables input methods for asian languages.
 244         // Must be set when creating custom text editing widgets.
 245         setAttribute(Qt::WA_InputMethodEnabled, true);
 246 }
 247
 248
 249
 250 GuiWorkArea::~GuiWorkArea()
 251 {
 252         buffer_view_->buffer().workAreaManager().remove(this);
 253         delete buffer_view_;
 254         delete cursor_;
 255 }
 256
 257
 258 void GuiWorkArea::close()
 259 {
 260         lyx_view_->removeWorkArea(this);
 261 }
 262
 263
 264 BufferView & GuiWorkArea::bufferView()
 265 {
 266         return *buffer_view_;
 267 }
 268
 269
 270 BufferView const & GuiWorkArea::bufferView() const
 271 {
 272         return *buffer_view_;
 273 }
 274
 275
 276 void GuiWorkArea::stopBlinkingCursor()
 277 {
 278         cursor_timeout_.stop();
 279         hideCursor();
 280 }
 281
 282
 283 void GuiWorkArea::startBlinkingCursor()
 284 {
 285         showCursor();
 286         cursor_timeout_.start();
 287 }
 288
 289
 290 void GuiWorkArea::redraw()
 291 {
 292         if (!isVisible())
 293                 // No need to redraw in this case.
 294                 return;
 295
 296         // No need to do anything if this is the current view. The BufferView
 297         // metrics are already up to date.
 298         if (lyx_view_ != guiApp->currentView()) {
 299                 // FIXME: it would be nice to optimize for the off-screen case.
 300                 buffer_view_->updateMetrics();
 301                 buffer_view_->cursor().fixIfBroken();
 302         }
 303
 304         // update cursor position, because otherwise it has to wait until
 305         // the blinking interval is over
 306         if (cursor_visible_) {
 307                 hideCursor();
 308                 showCursor();
 309         }
 310
 311         LYXERR(Debug::WORKAREA, "WorkArea::redraw screen");
 312         updateScreen();
 313         update(0, 0, viewport()->width(), viewport()->height());
 314
 315         /// \warning: scrollbar updating *must* be done after the BufferView is drawn
 316         /// because \c BufferView::updateScrollbar() is called in \c BufferView::draw().
 317         updateScrollbar();
 318         lyx_view_->updateStatusBar();
 319
 320         if (lyxerr.debugging(Debug::WORKAREA))
 321                 buffer_view_->coordCache().dump();
 322 }
 323
 324
 325 void GuiWorkArea::processKeySym(KeySymbol const & key, KeyModifier mod)
 326 {
 327         // In order to avoid bad surprise in the middle of an operation,
 328         // we better stop the blinking cursor.
 329         stopBlinkingCursor();
 330
 331         theLyXFunc().setLyXView(lyx_view_);
 332         theLyXFunc().processKeySym(key, mod);
 333 }
 334
 335
 336 void GuiWorkArea::dispatch(FuncRequest const & cmd0, KeyModifier mod)
 337 {
 338         // Handle drag&drop
 339         if (cmd0.action == LFUN_FILE_OPEN) {
 340                 lyx_view_->dispatch(cmd0);
 341                 return;
 342         }
 343
 344         theLyXFunc().setLyXView(lyx_view_);
 345
 346         FuncRequest cmd;
 347
 348         if (cmd0.action == LFUN_MOUSE_PRESS) {
 349                 if (mod == ShiftModifier)
 350                         cmd = FuncRequest(cmd0, "region-select");
 351                 else if (mod == ControlModifier)
 352                         cmd = FuncRequest(cmd0, "paragraph-select");
 353                 else
 354                         cmd = cmd0;
 355         }
 356         else
 357                 cmd = cmd0;
 358
 359         // In order to avoid bad surprise in the middle of an operation, we better stop
 360         // the blinking cursor.
 361         if (!(cmd.action == LFUN_MOUSE_MOTION
 362                 && cmd.button() == mouse_button::none))
 363                 stopBlinkingCursor();
 364
 365         buffer_view_->mouseEventDispatch(cmd);
 366
 367         // Skip these when selecting
 368         if (cmd.action != LFUN_MOUSE_MOTION) {
 369                 lyx_view_->updateLayoutList();
 370                 lyx_view_->updateToolbars();
 371         }
 372
 373         // GUI tweaks except with mouse motion with no button pressed.
 374         if (!(cmd.action == LFUN_MOUSE_MOTION
 375                 && cmd.button() == mouse_button::none)) {
 376                 // Slight hack: this is only called currently when we
 377                 // clicked somewhere, so we force through the display
 378                 // of the new status here.
 379                 lyx_view_->clearMessage();
 380
 381                 // Show the cursor immediately after any operation.
 382                 startBlinkingCursor();
 383         }
 384 }
 385
 386
 387 void GuiWorkArea::resizeBufferView()
 388 {
 389         // WARNING: Please don't put any code that will trigger a repaint here!
 390         // We are already inside a paint event.
 391         lyx_view_->setBusy(true);
 392         buffer_view_->resize(viewport()->width(), viewport()->height());
 393         lyx_view_->updateLayoutList();
 394         lyx_view_->setBusy(false);
 395         need_resize_ = false;
 396 }
 397
 398
 399 void GuiWorkArea::showCursor()
 400 {
 401         if (cursor_visible_)
 402                 return;
 403
 404         CursorShape shape = BAR_SHAPE;
 405
 406         Font const & realfont = buffer_view_->cursor().real_current_font;
 407         BufferParams const & bp = buffer_view_->buffer().params();
 408         bool const samelang = realfont.language() == bp.language;
 409         bool const isrtl = realfont.isVisibleRightToLeft();
 410
 411         if (!samelang || isrtl != bp.language->rightToLeft()) {
 412                 shape = L_SHAPE;
 413                 if (isrtl)
 414                         shape = REVERSED_L_SHAPE;
 415         }
 416
 417         // The ERT language hack needs fixing up
 418         if (realfont.language() == latex_language)
 419                 shape = BAR_SHAPE;
 420
 421         Font const font = buffer_view_->cursor().getFont();
 422         FontMetrics const & fm = theFontMetrics(font);
 423         int const asc = fm.maxAscent();
 424         int const des = fm.maxDescent();
 425         int h = asc + des;
 426         int x = 0;
 427         int y = 0;
 428         buffer_view_->cursor().getPos(x, y);
 429         y -= asc;
 430
 431         // if it doesn't touch the screen, don't try to show it
 432         if (y + h < 0 || y >= viewport()->height())
 433                 return;
 434
 435         cursor_visible_ = true;
 436         showCursor(x, y, h, shape);
 437 }
 438
 439
 440 void GuiWorkArea::hideCursor()
 441 {
 442         if (!cursor_visible_)
 443                 return;
 444
 445         cursor_visible_ = false;
 446         removeCursor();
 447 }
 448
 449
 450 void GuiWorkArea::toggleCursor()
 451 {
 452         if (cursor_visible_)
 453                 hideCursor();
 454         else
 455                 showCursor();
 456
 457         // Use this opportunity to deal with any child processes that
 458         // have finished but are waiting to communicate this fact
 459         // to the rest of LyX.
 460         ForkedCallsController::handleCompletedProcesses();
 461 }
 462
 463
 464 void GuiWorkArea::updateScrollbar()
 465 {
 466         verticalScrollBar()->setTracking(false);
 467
 468         ScrollbarParameters const & scroll_ = buffer_view_->scrollbarParameters();
 469
 470         // do what cursor movement does (some grey)
 471         int const h = scroll_.height + viewport()->height() / 4;
 472         int scroll_max_ = max(0, h - viewport()->height());
 473
 474         verticalScrollBar()->setRange(0, scroll_max_);
 475         verticalScrollBar()->setSliderPosition(scroll_.position);
 476         verticalScrollBar()->setSingleStep(scroll_.lineScrollHeight);
 477         verticalScrollBar()->setValue(scroll_.position);
 478
 479         verticalScrollBar()->setTracking(true);
 480 }
 481
 482
 483 void GuiWorkArea::adjustViewWithScrollBar(int action)
 484 {
 485         stopBlinkingCursor();
 486         if (action == QAbstractSlider::SliderPageStepAdd)
 487                 buffer_view_->scrollDown(viewport()->height());
 488         else if (action == QAbstractSlider::SliderPageStepSub)
 489                 buffer_view_->scrollUp(viewport()->height());
 490         else
 491                 buffer_view_->scrollDocView(verticalScrollBar()->sliderPosition());
 492
 493         if (lyxrc.cursor_follows_scrollbar) {
 494                 buffer_view_->setCursorFromScrollbar();
 495                 lyx_view_->updateLayoutList();
 496         }
 497         // Show the cursor immediately after any operation.
 498         startBlinkingCursor();
 499         QApplication::syncX();
 500 }
 501
 502
 503 bool GuiWorkArea::event(QEvent * e)
 504 {
 505     if (e->type() == QEvent::ToolTip) {
 506          QHelpEvent * helpEvent = static_cast<QHelpEvent *>(e);
 507                  QPoint pos = helpEvent->pos();
 508                  if (pos.x() < viewport()->width()) {
 509                          QString s = toqstr(buffer_view_->toolTip(pos.x(), pos.y()));
 510                  QToolTip::showText(helpEvent->globalPos(), s);
 511                  }
 512          else
 513              QToolTip::hideText();
 514      }
 515      return QAbstractScrollArea::event(e);
 516 }
 517
 518
 519 void GuiWorkArea::contextMenuEvent(QContextMenuEvent * e)
 520 {
 521         QPoint pos = e->pos();
 522         docstring name = buffer_view_->contextMenu(pos.x(), pos.y());
 523         if (name.empty()) {
 524                 QAbstractScrollArea::contextMenuEvent(e);
 525                 return;
 526         }
 527         QMenu * menu = guiApp->menus().menu(toqstr(name));
 528         if (!menu) {
 529                 QAbstractScrollArea::contextMenuEvent(e);
 530                 return;
 531         }
 532         // Position the menu to the right.
 533         // FIXME: menu position should be different for RTL text.
 534         pos.rx() += menu->width();
 535         // FIXME: correct vertical position of the menu WRT screen espace.
 536         //pos.ry() += menu->height();
 537         menu->exec(pos);
 538         QAbstractScrollArea::contextMenuEvent(e);
 539 }
 540
 541
 542 void GuiWorkArea::focusInEvent(QFocusEvent * /*event*/)
 543 {
 544         // Repaint the whole screen.
 545         // Note: this is different from redraw() as only the backing pixmap
 546         // will be redrawn, which is cheap.
 547         viewport()->repaint();
 548
 549         startBlinkingCursor();
 550 }
 551
 552
 553 void GuiWorkArea::focusOutEvent(QFocusEvent * /*event*/)
 554 {
 555         stopBlinkingCursor();
 556 }
 557
 558
 559 void GuiWorkArea::mousePressEvent(QMouseEvent * e)
 560 {
 561         if (dc_event_.active && dc_event_ == *e) {
 562                 dc_event_.active = false;
 563                 FuncRequest cmd(LFUN_MOUSE_TRIPLE, e->x(), e->y(),
 564                         q_button_state(e->button()));
 565                 dispatch(cmd);
 566                 return;
 567         }
 568
 569         inputContext()->reset();
 570
 571         FuncRequest const cmd(LFUN_MOUSE_PRESS, e->x(), e->y(),
 572                 q_button_state(e->button()));
 573         dispatch(cmd, q_key_state(e->modifiers()));
 574 }
 575
 576
 577 void GuiWorkArea::mouseReleaseEvent(QMouseEvent * e)
 578 {
 579         if (synthetic_mouse_event_.timeout.running())
 580                 synthetic_mouse_event_.timeout.stop();
 581
 582         FuncRequest const cmd(LFUN_MOUSE_RELEASE, e->x(), e->y(),
 583                               q_button_state(e->button()));
 584         dispatch(cmd);
 585 }
 586
 587
 588 void GuiWorkArea::mouseMoveEvent(QMouseEvent * e)
 589 {
 590         // we kill the triple click if we move
 591         doubleClickTimeout();
 592         FuncRequest cmd(LFUN_MOUSE_MOTION, e->x(), e->y(),
 593                               q_motion_state(e->buttons()));
 594
 595         // If we're above or below the work area...
 596         if (e->y() <= 20 || e->y() >= viewport()->height() - 20) {
 597                 // Make sure only a synthetic event can cause a page scroll,
 598                 // so they come at a steady rate:
 599                 if (e->y() <= 20)
 600                         // _Force_ a scroll up:
 601                         cmd.y = -40;
 602                 else
 603                         cmd.y = viewport()->height();
 604                 // Store the event, to be handled when the timeout expires.
 605                 synthetic_mouse_event_.cmd = cmd;
 606
 607                 if (synthetic_mouse_event_.timeout.running())
 608                         // Discard the event. Note that it _may_ be handled
 609                         // when the timeout expires if
 610                         // synthetic_mouse_event_.cmd has not been overwritten.
 611                         // Ie, when the timeout expires, we handle the
 612                         // most recent event but discard all others that
 613                         // occurred after the one used to start the timeout
 614                         // in the first place.
 615                         return;
 616                 else {
 617                         synthetic_mouse_event_.restart_timeout = true;
 618                         synthetic_mouse_event_.timeout.start();
 619                         // Fall through to handle this event...
 620                 }
 621
 622         } else if (synthetic_mouse_event_.timeout.running()) {
 623                 // Store the event, to be possibly handled when the timeout
 624                 // expires.
 625                 // Once the timeout has expired, normal control is returned
 626                 // to mouseMoveEvent (restart_timeout = false).
 627                 // This results in a much smoother 'feel' when moving the
 628                 // mouse back into the work area.
 629                 synthetic_mouse_event_.cmd = cmd;
 630                 synthetic_mouse_event_.restart_timeout = false;
 631                 return;
 632         }
 633
 634         // Has anything changed on-screen since the last QMouseEvent
 635         // was received?
 636         double const scrollbar_value = verticalScrollBar()->value();
 637         if (e->x() != synthetic_mouse_event_.x_old ||
 638             e->y() != synthetic_mouse_event_.y_old ||
 639             scrollbar_value != synthetic_mouse_event_.scrollbar_value_old) {
 640                 // Yes it has. Store the params used to check this.
 641                 synthetic_mouse_event_.x_old = e->x();
 642                 synthetic_mouse_event_.y_old = e->y();
 643                 synthetic_mouse_event_.scrollbar_value_old = scrollbar_value;
 644
 645                 // ... and dispatch the event to the LyX core.
 646                 dispatch(cmd);
 647         }
 648 }
 649
 650
 651 void GuiWorkArea::wheelEvent(QWheelEvent * e)
 652 {
 653         // Wheel rotation by one notch results in a delta() of 120 (see
 654         // documentation of QWheelEvent)
 655         int const lines = qApp->wheelScrollLines() * e->delta() / 120;
 656         verticalScrollBar()->setValue(verticalScrollBar()->value() -
 657                         lines *  verticalScrollBar()->singleStep());
 658         adjustViewWithScrollBar();
 659 }
 660
 661
 662 void GuiWorkArea::generateSyntheticMouseEvent()
 663 {
 664 // Set things off to generate the _next_ 'pseudo' event.
 665         if (synthetic_mouse_event_.restart_timeout)
 666                 synthetic_mouse_event_.timeout.start();
 667
 668         // Has anything changed on-screen since the last timeout signal
 669         // was received?
 670         double const scrollbar_value = verticalScrollBar()->value();
 671         if (scrollbar_value != synthetic_mouse_event_.scrollbar_value_old) {
 672                 // Yes it has. Store the params used to check this.
 673                 synthetic_mouse_event_.scrollbar_value_old = scrollbar_value;
 674
 675                 // ... and dispatch the event to the LyX core.
 676                 dispatch(synthetic_mouse_event_.cmd);
 677         }
 678 }
 679
 680
 681 void GuiWorkArea::keyPressEvent(QKeyEvent * ev)
 682 {
 683         // do nothing if there are other events
 684         // (the auto repeated events come too fast)
 685         // \todo FIXME: remove hard coded Qt keys, process the key binding
 686 #ifdef Q_WS_X11
 687         if (XEventsQueued(QX11Info::display(), 0) > 1 && ev->isAutoRepeat()
 688                         && (Qt::Key_PageDown || Qt::Key_PageUp)) {
 689                 LYXERR(Debug::KEY, "system is busy: scroll key event ignored");
 690                 ev->ignore();
 691                 return;
 692         }
 693 #endif
 694
 695         LYXERR(Debug::KEY, " count: " << ev->count()
 696                 << " text: " << fromqstr(ev->text())
 697                 << " isAutoRepeat: " << ev->isAutoRepeat() << " key: " << ev->key());
 698
 699         KeySymbol sym;
 700         setKeySymbol(&sym, ev);
 701         processKeySym(sym, q_key_state(ev->modifiers()));
 702 }
 703
 704
 705 void GuiWorkArea::doubleClickTimeout()
 706 {
 707         dc_event_.active = false;
 708 }
 709
 710
 711 void GuiWorkArea::mouseDoubleClickEvent(QMouseEvent * ev)
 712 {
 713         dc_event_ = DoubleClick(ev);
 714         QTimer::singleShot(QApplication::doubleClickInterval(), this,
 715                            SLOT(doubleClickTimeout()));
 716         FuncRequest cmd(LFUN_MOUSE_DOUBLE,
 717                         ev->x(), ev->y(),
 718                         q_button_state(ev->button()));
 719         dispatch(cmd);
 720 }
 721
 722
 723 void GuiWorkArea::resizeEvent(QResizeEvent * ev)
 724 {
 725         QAbstractScrollArea::resizeEvent(ev);
 726         need_resize_ = true;
 727 }
 728
 729
 730 void GuiWorkArea::update(int x, int y, int w, int h)
 731 {
 732         viewport()->repaint(x, y, w, h);
 733 }
 734
 735
 736 void GuiWorkArea::paintEvent(QPaintEvent * ev)
 737 {
 738         QRect const rc = ev->rect();
 739         // LYXERR(Debug::PAINTING, "paintEvent begin: x: " << rc.x()
 740         //      << " y: " << rc.y() << " w: " << rc.width() << " h: " << rc.height());
 741
 742         if (need_resize_) {
 743                 verticalScrollBar()->setPageStep(viewport()->height());
 744                 screen_ = QPixmap(viewport()->width(), viewport()->height());
 745                 resizeBufferView();
 746                 updateScreen();
 747                 hideCursor();
 748                 showCursor();
 749         }
 750
 751         QPainter pain(viewport());
 752         pain.drawPixmap(rc, screen_, rc);
 753         cursor_->draw(pain);
 754 }
 755
 756
 757 void GuiWorkArea::updateScreen()
 758 {
 759         GuiPainter pain(&screen_);
 760         buffer_view_->draw(pain);
 761 }
 762
 763
 764 void GuiWorkArea::showCursor(int x, int y, int h, CursorShape shape)
 765 {
 766         if (schedule_redraw_) {
 767                 buffer_view_->updateMetrics();
 768                 updateScreen();
 769                 viewport()->update(QRect(0, 0, viewport()->width(), viewport()->height()));
 770                 schedule_redraw_ = false;
 771                 // Show the cursor immediately after the update.
 772                 hideCursor();
 773                 toggleCursor();
 774                 return;
 775         }
 776
 777         cursor_->update(x, y, h, shape);
 778         cursor_->show();
 779         viewport()->update(cursor_->rect());
 780 }
 781
 782
 783 void GuiWorkArea::removeCursor()
 784 {
 785         cursor_->hide();
 786         //if (!qApp->focusWidget())
 787                 viewport()->update(cursor_->rect());
 788 }
 789
 790
 791 void GuiWorkArea::inputMethodEvent(QInputMethodEvent * e)
 792 {
 793         QString const & commit_string = e->commitString();
 794         docstring const & preedit_string
 795                 = qstring_to_ucs4(e->preeditString());
 796
 797         if (!commit_string.isEmpty()) {
 798
 799                 LYXERR(Debug::KEY, "preeditString: " << fromqstr(e->preeditString())
 800                         << " commitString: " << fromqstr(e->commitString()));
 801
 802                 int key = 0;
 803
 804                 // FIXME Iwami 04/01/07: we should take care also of UTF16 surrogates here.
 805                 for (int i = 0; i != commit_string.size(); ++i) {
 806                         QKeyEvent ev(QEvent::KeyPress, key, Qt::NoModifier, commit_string[i]);
 807                         keyPressEvent(&ev);
 808                 }
 809         }
 810
 811         // Hide the cursor during the kana-kanji transformation.
 812         if (preedit_string.empty())
 813                 startBlinkingCursor();
 814         else
 815                 stopBlinkingCursor();
 816
 817         // last_width : for checking if last preedit string was/wasn't empty.
 818         static bool last_width = false;
 819         if (!last_width && preedit_string.empty()) {
 820                 // if last_width is last length of preedit string.
 821                 e->accept();
 822                 return;
 823         }
 824
 825         GuiPainter pain(&screen_);
 826         buffer_view_->updateMetrics();
 827         buffer_view_->draw(pain);
 828         FontInfo font = buffer_view_->cursor().getFont().fontInfo();
 829         FontMetrics const & fm = theFontMetrics(font);
 830         int height = fm.maxHeight();
 831         int cur_x = cursor_->rect().left();
 832         int cur_y = cursor_->rect().bottom();
 833
 834         // redraw area of preedit string.
 835         update(0, cur_y - height, viewport()->width(),
 836                 (height + 1) * preedit_lines_);
 837
 838         if (preedit_string.empty()) {
 839                 last_width = false;
 840                 preedit_lines_ = 1;
 841                 e->accept();
 842                 return;
 843         }
 844         last_width = true;
 845
 846         // att : stores an IM attribute.
 847         QList<QInputMethodEvent::Attribute> const & att = e->attributes();
 848
 849         // get attributes of input method cursor.
 850         // cursor_pos : cursor position in preedit string.
 851         size_t cursor_pos = 0;
 852         bool cursor_is_visible = false;
 853         for (int i = 0; i != att.size(); ++i) {
 854                 if (att.at(i).type == QInputMethodEvent::Cursor) {
 855                         cursor_pos = att.at(i).start;
 856                         cursor_is_visible = att.at(i).length != 0;
 857                         break;
 858                 }
 859         }
 860
 861         size_t preedit_length = preedit_string.length();
 862
 863         // get position of selection in input method.
 864         // FIXME: isn't there a way to do this simplier?
 865         // rStart : cursor position in selected string in IM.
 866         size_t rStart = 0;
 867         // rLength : selected string length in IM.
 868         size_t rLength = 0;
 869         if (cursor_pos < preedit_length) {
 870                 for (int i = 0; i != att.size(); ++i) {
 871                         if (att.at(i).type == QInputMethodEvent::TextFormat) {
 872                                 if (att.at(i).start <= int(cursor_pos)
 873                                         && int(cursor_pos) < att.at(i).start + att.at(i).length) {
 874                                                 rStart = att.at(i).start;
 875                                                 rLength = att.at(i).length;
 876                                                 if (!cursor_is_visible)
 877                                                         cursor_pos += rLength;
 878                                                 break;
 879                                 }
 880                         }
 881                 }
 882         }
 883         else {
 884                 rStart = cursor_pos;
 885                 rLength = 0;
 886         }
 887
 888         int const right_margin = rightMargin();
 889         Painter::preedit_style ps;
 890         // Most often there would be only one line:
 891         preedit_lines_ = 1;
 892         for (size_t pos = 0; pos != preedit_length; ++pos) {
 893                 char_type const typed_char = preedit_string[pos];
 894                 // reset preedit string style
 895                 ps = Painter::preedit_default;
 896
 897                 // if we reached the right extremity of the screen, go to next line.
 898                 if (cur_x + fm.width(typed_char) > viewport()->width() - right_margin) {
 899                         cur_x = right_margin;
 900                         cur_y += height + 1;
 901                         ++preedit_lines_;
 902                 }
 903                 // preedit strings are displayed with dashed underline
 904                 // and partial strings are displayed white on black indicating
 905                 // that we are in selecting mode in the input method.
 906                 // FIXME: rLength == preedit_length is not a changing condition
 907                 // FIXME: should be put out of the loop.
 908                 if (pos >= rStart
 909                         && pos < rStart + rLength
 910                         && !(cursor_pos < rLength && rLength == preedit_length))
 911                         ps = Painter::preedit_selecting;
 912
 913                 if (pos == cursor_pos
 914                         && (cursor_pos < rLength && rLength == preedit_length))
 915                         ps = Painter::preedit_cursor;
 916
 917                 // draw one character and update cur_x.
 918                 cur_x += pain.preeditText(cur_x, cur_y, typed_char, font, ps);
 919         }
 920
 921         // update the preedit string screen area.
 922         update(0, cur_y - preedit_lines_*height, viewport()->width(),
 923                 (height + 1) * preedit_lines_);
 924
 925         // Don't forget to accept the event!
 926         e->accept();
 927 }
 928
 929
 930 QVariant GuiWorkArea::inputMethodQuery(Qt::InputMethodQuery query) const
 931 {
 932         QRect cur_r(0,0,0,0);
 933         switch (query) {
 934                 // this is the CJK-specific composition window position.
 935                 case Qt::ImMicroFocus:
 936                         cur_r = cursor_->rect();
 937                         if (preedit_lines_ != 1)
 938                                 cur_r.moveLeft(10);
 939                         cur_r.moveBottom(cur_r.bottom() + cur_r.height() * preedit_lines_);
 940                         // return lower right of cursor in LyX.
 941                         return cur_r;
 942                 default:
 943                         return QWidget::inputMethodQuery(query);
 944         }
 945 }
 946
 947
 948 void GuiWorkArea::updateWindowTitle()
 949 {
 950         docstring maximize_title;
 951         docstring minimize_title;
 952
 953         Buffer & buf = buffer_view_->buffer();
 954         FileName const fileName = buf.fileName();
 955         if (!fileName.empty()) {
 956                 maximize_title = fileName.displayName(30);
 957                 minimize_title = from_utf8(fileName.onlyFileName());
 958                 if (!buf.isClean()) {
 959                         maximize_title += _(" (changed)");
 960                         minimize_title += char_type('*');
 961                 }
 962                 if (buf.isReadonly())
 963                         maximize_title += _(" (read only)");
 964         }
 965
 966         QString title = windowTitle();
 967         QString new_title = toqstr(maximize_title);
 968         if (title == new_title)
 969                 return;
 970
 971         QWidget::setWindowTitle(new_title);
 972         QWidget::setWindowIconText(toqstr(minimize_title));
 973         titleChanged(this);
 974 }
 975
 976
 977 void GuiWorkArea::setReadOnly(bool)
 978 {
 979         updateWindowTitle();
 980         if (this == lyx_view_->currentWorkArea())
 981                 lyx_view_->updateBufferDependent(false);
 982 }
 983
 984
 985 ////////////////////////////////////////////////////////////////////
 986 //
 987 // TabWorkArea
 988 //
 989 ////////////////////////////////////////////////////////////////////
 990
 991 TabWorkArea::TabWorkArea(QWidget * parent) : QTabWidget(parent)
 992 {
 993         QPalette pal = palette();
 994         pal.setColor(QPalette::Active, QPalette::Button,
 995                 pal.color(QPalette::Active, QPalette::Window));
 996         pal.setColor(QPalette::Disabled, QPalette::Button,
 997                 pal.color(QPalette::Disabled, QPalette::Window));
 998         pal.setColor(QPalette::Inactive, QPalette::Button,
 999                 pal.color(QPalette::Inactive, QPalette::Window));
1000
1001         QToolButton * closeTabButton = new QToolButton(this);
1002     closeTabButton->setPalette(pal);
1003         closeTabButton->setIcon(QIcon(":/images/closetab.png"));
1004         closeTabButton->setText("Close");
1005         closeTabButton->setAutoRaise(true);
1006         closeTabButton->setCursor(Qt::ArrowCursor);
1007         closeTabButton->setToolTip(tr("Close tab"));
1008         closeTabButton->setEnabled(true);
1009
1010         QObject::connect(this, SIGNAL(currentChanged(int)),
1011                 this, SLOT(on_currentTabChanged(int)));
1012         QObject::connect(closeTabButton, SIGNAL(clicked()),
1013                 this, SLOT(closeCurrentTab()));
1014
1015         setCornerWidget(closeTabButton);
1016         setUsesScrollButtons(true);
1017 }
1018
1019
1020 void TabWorkArea::showBar(bool show)
1021 {
1022         tabBar()->setEnabled(show);
1023         tabBar()->setVisible(show);
1024 }
1025
1026
1027 GuiWorkArea * TabWorkArea::currentWorkArea()
1028 {
1029         if (count() == 0)
1030                 return 0;
1031
1032         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(currentWidget());
1033         BOOST_ASSERT(wa);
1034         return wa;
1035 }
1036
1037
1038 GuiWorkArea * TabWorkArea::workArea(Buffer & buffer)
1039 {
1040         for (int i = 0; i != count(); ++i) {
1041                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i));
1042                 BOOST_ASSERT(wa);
1043                 if (&wa->bufferView().buffer() == &buffer)
1044                         return wa;
1045         }
1046         return 0;
1047 }
1048
1049
1050 void TabWorkArea::closeAll()
1051 {
1052         while (count()) {
1053                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(0));
1054                 BOOST_ASSERT(wa);
1055                 removeTab(0);
1056                 delete wa;
1057         }
1058 }
1059
1060
1061 bool TabWorkArea::setCurrentWorkArea(GuiWorkArea * work_area)
1062 {
1063         BOOST_ASSERT(work_area);
1064         int index = indexOf(work_area);
1065         if (index == -1)
1066                 return false;
1067
1068         if (index == currentIndex())
1069                 // Make sure the work area is up to date.
1070                 on_currentTabChanged(index);
1071         else
1072                 // Switch to the work area.
1073                 setCurrentIndex(index);
1074         work_area->setFocus();
1075
1076         return true;
1077 }
1078
1079
1080 GuiWorkArea * TabWorkArea::addWorkArea(Buffer & buffer, GuiView & view)
1081 {
1082         GuiWorkArea * wa = new GuiWorkArea(buffer, view);
1083         wa->setUpdatesEnabled(false);
1084         // Hide tabbar if there's no tab (avoid a resize and a flashing tabbar
1085         // when hiding it again below).
1086         showBar(count() > 0);
1087         addTab(wa, wa->windowTitle());
1088         QObject::connect(wa, SIGNAL(titleChanged(GuiWorkArea *)),
1089                 this, SLOT(updateTabText(GuiWorkArea *)));
1090         // Hide tabbar if there's only one tab.
1091         showBar(count() > 1);
1092         return wa;
1093 }
1094
1095
1096 bool TabWorkArea::removeWorkArea(GuiWorkArea * work_area)
1097 {
1098         BOOST_ASSERT(work_area);
1099         int index = indexOf(work_area);
1100         if (index == -1)
1101                 return false;
1102
1103         work_area->setUpdatesEnabled(false);
1104         removeTab(index);
1105         delete work_area;
1106
1107         if (count()) {
1108                 // make sure the next work area is enabled.
1109                 currentWidget()->setUpdatesEnabled(true);
1110                 // Hide tabbar if there's only one tab.
1111                 showBar(count() > 1);
1112         }
1113         return true;
1114 }
1115
1116
1117 void TabWorkArea::on_currentTabChanged(int i)
1118 {
1119         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i));
1120         BOOST_ASSERT(wa);
1121         BufferView & bv = wa->bufferView();
1122         bv.cursor().fixIfBroken();
1123         bv.updateMetrics();
1124         wa->setUpdatesEnabled(true);
1125         wa->redraw();
1126         wa->setFocus();
1127         ///
1128         currentWorkAreaChanged(wa);
1129
1130         LYXERR(Debug::GUI, "currentTabChanged " << i
1131                 << "File" << bv.buffer().absFileName());
1132 }
1133
1134
1135 void TabWorkArea::closeCurrentTab()
1136 {
1137         lyx::dispatch(FuncRequest(LFUN_BUFFER_CLOSE));
1138 }
1139
1140
1141 void TabWorkArea::updateTabText(GuiWorkArea * wa)
1142 {
1143         int const i = indexOf(wa);
1144         if (i < 0)
1145                 return;
1146         setTabText(i, wa->windowTitle());
1147 }
1148
1149 } // namespace frontend
1150 } // namespace lyx
1151
1152 #include "GuiWorkArea_moc.cpp"