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