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 "debug.h"
  22 #include "Font.h"
  23 #include "FuncRequest.h"
  24 #include "gettext.h"
  25 #include "GuiApplication.h"
  26 #include "GuiKeySymbol.h"
  27 #include "GuiPainter.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/FileName.h"
  40 #include "support/ForkedcallsController.h"
  41
  42 #include "frontends/Application.h"
  43 #include "frontends/Dialogs.h"  // only used in setReadOnly
  44 #include "frontends/FontMetrics.h"
  45 #include "frontends/LyXView.h"
  46 #include "frontends/WorkAreaManager.h"
  47
  48 #include <QInputContext>
  49 #include <QLayout>
  50 #include <QMainWindow>
  51 #include <QPainter>
  52 #include <QToolButton>
  53 #include <QPalette>
  54 #include <QScrollBar>
  55 #include <QTabBar>
  56 #include <QTimer>
  57
  58 #include <boost/bind.hpp>
  59 #include <boost/current_function.hpp>
  60
  61 #ifdef Q_WS_X11
  62 #include <QX11Info>
  63 extern "C" int XEventsQueued(Display *display, int mode);
  64 #endif
  65
  66 #ifdef Q_WS_WIN
  67 int const CursorWidth = 2;
  68 #else
  69 int const CursorWidth = 1;
  70 #endif
  71
  72 #undef KeyPress
  73 #undef NoModifier
  74
  75 using std::endl;
  76 using std::min;
  77 using std::max;
  78 using std::string;
  79
  80 namespace lyx {
  81
  82 using support::FileName;
  83 using support::ForkedcallsController;
  84
  85
  86 /// return the LyX mouse button state from Qt's
  87 static mouse_button::state q_button_state(Qt::MouseButton button)
  88 {
  89         mouse_button::state b = mouse_button::none;
  90         switch (button) {
  91                 case Qt::LeftButton:
  92                         b = mouse_button::button1;
  93                         break;
  94                 case Qt::MidButton:
  95                         b = mouse_button::button2;
  96                         break;
  97                 case Qt::RightButton:
  98                         b = mouse_button::button3;
  99                         break;
 100                 default:
 101                         break;
 102         }
 103         return b;
 104 }
 105
 106
 107 /// return the LyX mouse button state from Qt's
 108 mouse_button::state q_motion_state(Qt::MouseButtons state)
 109 {
 110         mouse_button::state b = mouse_button::none;
 111         if (state & Qt::LeftButton)
 112                 b |= mouse_button::button1;
 113         if (state & Qt::MidButton)
 114                 b |= mouse_button::button2;
 115         if (state & Qt::RightButton)
 116                 b |= mouse_button::button3;
 117         return b;
 118 }
 119
 120
 121 namespace frontend {
 122
 123 class CursorWidget {
 124 public:
 125         CursorWidget() {}
 126
 127         void draw(QPainter & painter)
 128         {
 129                 if (show_ && rect_.isValid()) {
 130                         switch (shape_) {
 131                         case L_SHAPE:
 132                                 painter.fillRect(rect_.x(), rect_.y(), CursorWidth, rect_.height(), color_);
 133                                 painter.setPen(color_);
 134                                 painter.drawLine(rect_.bottomLeft().x() + CursorWidth, rect_.bottomLeft().y(),
 135                                                                                                  rect_.bottomRight().x(), rect_.bottomLeft().y());
 136                                 break;
 137
 138                         case REVERSED_L_SHAPE:
 139                                 painter.fillRect(rect_.x() + rect_.height() / 3, rect_.y(), CursorWidth, rect_.height(), color_);
 140                                 painter.setPen(color_);
 141                                 painter.drawLine(rect_.bottomRight().x() - CursorWidth, rect_.bottomLeft().y(),
 142                                                                                                          rect_.bottomLeft().x(), rect_.bottomLeft().y());
 143                                 break;
 144
 145                         default:
 146                                 painter.fillRect(rect_, color_);
 147                                 break;
 148                         }
 149                 }
 150         }
 151
 152         void update(int x, int y, int h, CursorShape shape)
 153         {
 154                 color_ = guiApp->colorCache().get(Color_cursor);
 155                 shape_ = shape;
 156                 switch (shape) {
 157                 case L_SHAPE:
 158                         rect_ = QRect(x, y, CursorWidth + h / 3, h);
 159                         break;
 160                 case REVERSED_L_SHAPE:
 161                         rect_ = QRect(x - h / 3, y, CursorWidth + h / 3, h);
 162                         break;
 163                 default:
 164                         rect_ = QRect(x, y, CursorWidth, h);
 165                         break;
 166                 }
 167         }
 168
 169         void show(bool set_show = true) { show_ = set_show; }
 170         void hide() { show_ = false; }
 171
 172         QRect const & rect() { return rect_; }
 173
 174 private:
 175         ///
 176         CursorShape shape_;
 177         ///
 178         bool show_;
 179         ///
 180         QColor color_;
 181         ///
 182         QRect rect_;
 183 };
 184
 185
 186 // This is a 'heartbeat' generating synthetic mouse move events when the
 187 // cursor is at the top or bottom edge of the viewport. One scroll per 0.2 s
 188 SyntheticMouseEvent::SyntheticMouseEvent()
 189         : timeout(200), restart_timeout(true),
 190           x_old(-1), y_old(-1), scrollbar_value_old(-1.0)
 191 {}
 192
 193
 194
 195 // All the below connection objects are needed because of a bug in some
 196 // versions of GCC (<=2.96 are on the suspects list.) By having and assigning
 197 // to these connections we avoid a segfault upon startup, and also at exit.
 198 // (Lgb)
 199
 200 static boost::signals::connection timecon;
 201
 202 // HACK: FIXME
 203 WorkArea::~WorkArea() {}
 204
 205
 206 GuiWorkArea::GuiWorkArea(Buffer & buffer, LyXView & lv)
 207         : buffer_view_(new BufferView(buffer)), lyx_view_(&lv),
 208           cursor_visible_(false), cursor_timeout_(400),
 209     need_resize_(false), schedule_redraw_(false),
 210                 preedit_lines_(1)
 211 {
 212         buffer.workAreaManager().add(this);
 213         // Setup the signals
 214         timecon = cursor_timeout_.timeout
 215                 .connect(boost::bind(&GuiWorkArea::toggleCursor, this));
 216
 217         cursor_timeout_.start();
 218
 219         screen_ = QPixmap(viewport()->width(), viewport()->height());
 220         cursor_ = new frontend::CursorWidget();
 221         cursor_->hide();
 222
 223         setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
 224         setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 225         setAcceptDrops(true);
 226         setMouseTracking(true);
 227         setMinimumSize(100, 70);
 228         updateWindowTitle();
 229
 230         viewport()->setAutoFillBackground(false);
 231         // We don't need double-buffering nor SystemBackground on
 232         // the viewport because we have our own backing pixmap.
 233         viewport()->setAttribute(Qt::WA_NoSystemBackground);
 234
 235         setFocusPolicy(Qt::WheelFocus);
 236
 237         viewport()->setCursor(Qt::IBeamCursor);
 238
 239         synthetic_mouse_event_.timeout.timeout.connect(
 240                 boost::bind(&GuiWorkArea::generateSyntheticMouseEvent,
 241                                         this));
 242
 243         // Initialize the vertical Scroll Bar
 244         QObject::connect(verticalScrollBar(), SIGNAL(actionTriggered(int)),
 245                 this, SLOT(adjustViewWithScrollBar(int)));
 246
 247         // disable context menu for the scrollbar
 248         verticalScrollBar()->setContextMenuPolicy(Qt::NoContextMenu);
 249
 250         // PageStep only depends on the viewport height.
 251         verticalScrollBar()->setPageStep(viewport()->height());
 252
 253         LYXERR(Debug::GUI) << BOOST_CURRENT_FUNCTION
 254                 << "\n Area width\t" << width()
 255                 << "\n Area height\t" << height()
 256                 << "\n viewport width\t" << viewport()->width()
 257                 << "\n viewport height\t" << viewport()->height()
 258                 << endl;
 259
 260         // Enables input methods for asian languages.
 261         // Must be set when creating custom text editing widgets.
 262         setAttribute(Qt::WA_InputMethodEnabled, true);
 263 }
 264
 265
 266
 267 GuiWorkArea::~GuiWorkArea()
 268 {
 269         buffer_view_->buffer().workAreaManager().remove(this);
 270         delete buffer_view_;
 271 }
 272
 273
 274 void GuiWorkArea::close()
 275 {
 276         lyx_view_->removeWorkArea(this);
 277 }
 278
 279
 280 BufferView & GuiWorkArea::bufferView()
 281 {
 282         return *buffer_view_;
 283 }
 284
 285
 286 BufferView const & GuiWorkArea::bufferView() const
 287 {
 288         return *buffer_view_;
 289 }
 290
 291
 292 void GuiWorkArea::stopBlinkingCursor()
 293 {
 294         cursor_timeout_.stop();
 295         hideCursor();
 296 }
 297
 298
 299 void GuiWorkArea::startBlinkingCursor()
 300 {
 301         showCursor();
 302         cursor_timeout_.restart();
 303 }
 304
 305
 306 void GuiWorkArea::redraw()
 307 {
 308         if (!isVisible())
 309                 // No need to redraw in this case.
 310                 return;
 311
 312         // No need to do anything if this is the current view. The BufferView
 313         // metrics are already up to date.
 314         if (lyx_view_ != theApp()->currentView()) {
 315                 // FIXME: it would be nice to optimize for the off-screen case.
 316                 buffer_view_->updateMetrics();
 317                 buffer_view_->cursor().fixIfBroken();
 318         }
 319
 320         updateScrollbar();
 321
 322         // update cursor position, because otherwise it has to wait until
 323         // the blinking interval is over
 324         if (cursor_visible_) {
 325                 hideCursor();
 326                 showCursor();
 327         }
 328
 329         ViewMetricsInfo const & vi = buffer_view_->viewMetricsInfo();
 330
 331         LYXERR(Debug::WORKAREA) << "WorkArea::redraw screen" << endl;
 332
 333         int const ymin = std::max(vi.y1, 0);
 334         int const ymax = vi.p2 < vi.size - 1 ? vi.y2 : height();
 335
 336         expose(0, ymin, width(), ymax - ymin);
 337
 338         //LYXERR(Debug::WORKAREA)
 339         //<< "  ymin = " << ymin << "  width() = " << width()
 340 //              << "  ymax-ymin = " << ymax-ymin << std::endl;
 341
 342         if (lyxerr.debugging(Debug::WORKAREA))
 343                 buffer_view_->coordCache().dump();
 344 }
 345
 346
 347 void GuiWorkArea::processKeySym(KeySymbol const & key, KeyModifier mod)
 348 {
 349         // In order to avoid bad surprise in the middle of an operation,
 350         // we better stop the blinking cursor.
 351         stopBlinkingCursor();
 352
 353         theLyXFunc().setLyXView(lyx_view_);
 354         theLyXFunc().processKeySym(key, mod);
 355 }
 356
 357
 358 void GuiWorkArea::dispatch(FuncRequest const & cmd0, KeyModifier mod)
 359 {
 360         // Handle drag&drop
 361         if (cmd0.action == LFUN_FILE_OPEN) {
 362                 lyx_view_->dispatch(cmd0);
 363                 return;
 364         }
 365
 366         theLyXFunc().setLyXView(lyx_view_);
 367
 368         FuncRequest cmd;
 369
 370         if (cmd0.action == LFUN_MOUSE_PRESS) {
 371                 if (mod == ShiftModifier)
 372                         cmd = FuncRequest(cmd0, "region-select");
 373                 else if (mod == ControlModifier)
 374                         cmd = FuncRequest(cmd0, "paragraph-select");
 375                 else
 376                         cmd = cmd0;
 377         }
 378         else
 379                 cmd = cmd0;
 380
 381         // In order to avoid bad surprise in the middle of an operation, we better stop
 382         // the blinking cursor.
 383         if (!(cmd.action == LFUN_MOUSE_MOTION
 384                 && cmd.button() == mouse_button::none))
 385                 stopBlinkingCursor();
 386
 387         buffer_view_->mouseEventDispatch(cmd);
 388
 389         // Skip these when selecting
 390         if (cmd.action != LFUN_MOUSE_MOTION) {
 391                 lyx_view_->updateLayoutChoice(false);
 392                 lyx_view_->updateToolbars();
 393         }
 394
 395         // GUI tweaks except with mouse motion with no button pressed.
 396         if (!(cmd.action == LFUN_MOUSE_MOTION
 397                 && cmd.button() == mouse_button::none)) {
 398                 // Slight hack: this is only called currently when we
 399                 // clicked somewhere, so we force through the display
 400                 // of the new status here.
 401                 lyx_view_->clearMessage();
 402
 403                 // Show the cursor immediately after any operation.
 404                 startBlinkingCursor();
 405         }
 406 }
 407
 408
 409 void GuiWorkArea::resizeBufferView()
 410 {
 411         // WARNING: Please don't put any code that will trigger a repaint here!
 412         // We are already inside a paint event.
 413         lyx_view_->setBusy(true);
 414         buffer_view_->resize(width(), height());
 415         lyx_view_->updateLayoutChoice(false);
 416         lyx_view_->setBusy(false);
 417 }
 418
 419
 420 void GuiWorkArea::updateScrollbar()
 421 {
 422         buffer_view_->updateScrollbar();
 423         ScrollbarParameters const & scroll_ = buffer_view_->scrollbarParameters();
 424         setScrollbarParams(scroll_.height, scroll_.position,
 425                 scroll_.lineScrollHeight);
 426 }
 427
 428
 429 void GuiWorkArea::showCursor()
 430 {
 431         if (cursor_visible_)
 432                 return;
 433
 434         CursorShape shape = BAR_SHAPE;
 435
 436         Font const & realfont = buffer_view_->cursor().real_current_font;
 437         BufferParams const & bp = buffer_view_->buffer().params();
 438         bool const samelang = realfont.language() == bp.language;
 439         bool const isrtl = realfont.isVisibleRightToLeft();
 440
 441         if (!samelang || isrtl != bp.language->rightToLeft()) {
 442                 shape = L_SHAPE;
 443                 if (isrtl)
 444                         shape = REVERSED_L_SHAPE;
 445         }
 446
 447         // The ERT language hack needs fixing up
 448         if (realfont.language() == latex_language)
 449                 shape = BAR_SHAPE;
 450
 451         Font const font = buffer_view_->cursor().getFont();
 452         FontMetrics const & fm = theFontMetrics(font);
 453         int const asc = fm.maxAscent();
 454         int const des = fm.maxDescent();
 455         int h = asc + des;
 456         int x = 0;
 457         int y = 0;
 458         buffer_view_->cursor().getPos(x, y);
 459         y -= asc;
 460
 461         // if it doesn't touch the screen, don't try to show it
 462         if (y + h < 0 || y >= height())
 463                 return;
 464
 465         cursor_visible_ = true;
 466         showCursor(x, y, h, shape);
 467 }
 468
 469
 470 void GuiWorkArea::hideCursor()
 471 {
 472         if (!cursor_visible_)
 473                 return;
 474
 475         cursor_visible_ = false;
 476         removeCursor();
 477 }
 478
 479
 480 void GuiWorkArea::toggleCursor()
 481 {
 482         if (cursor_visible_)
 483                 hideCursor();
 484         else
 485                 showCursor();
 486
 487         // Use this opportunity to deal with any child processes that
 488         // have finished but are waiting to communicate this fact
 489         // to the rest of LyX.
 490         ForkedcallsController & fcc = ForkedcallsController::get();
 491         fcc.handleCompletedProcesses();
 492
 493         cursor_timeout_.restart();
 494 }
 495
 496
 497 void GuiWorkArea::setScrollbarParams(int h, int scroll_pos, int scroll_line_step)
 498 {
 499         if (verticalScrollBarPolicy() != Qt::ScrollBarAlwaysOn)
 500                 setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
 501
 502         verticalScrollBar()->setTracking(false);
 503
 504         // do what cursor movement does (some grey)
 505         h += height() / 4;
 506         int scroll_max_ = std::max(0, h - height());
 507
 508         verticalScrollBar()->setRange(0, scroll_max_);
 509         verticalScrollBar()->setSliderPosition(scroll_pos);
 510         verticalScrollBar()->setSingleStep(scroll_line_step);
 511         verticalScrollBar()->setValue(scroll_pos);
 512
 513         verticalScrollBar()->setTracking(true);
 514 }
 515
 516
 517 void GuiWorkArea::adjustViewWithScrollBar(int action)
 518 {
 519         stopBlinkingCursor();
 520         if (action == QAbstractSlider::SliderPageStepAdd)
 521                 buffer_view_->scrollDown(viewport()->height());
 522         else if (action == QAbstractSlider::SliderPageStepSub)
 523                 buffer_view_->scrollUp(viewport()->height());
 524         else
 525                 buffer_view_->scrollDocView(verticalScrollBar()->sliderPosition());
 526
 527         if (lyxrc.cursor_follows_scrollbar) {
 528                 buffer_view_->setCursorFromScrollbar();
 529                 lyx_view_->updateLayoutChoice(false);
 530         }
 531         // Show the cursor immediately after any operation.
 532         startBlinkingCursor();
 533         QApplication::syncX();
 534 }
 535
 536
 537 void GuiWorkArea::focusInEvent(QFocusEvent * /*event*/)
 538 {
 539         // Repaint the whole screen.
 540         // Note: this is different from redraw() as only the backing pixmap
 541         // will be redrawn, which is cheap.
 542         viewport()->repaint();
 543
 544         startBlinkingCursor();
 545 }
 546
 547
 548 void GuiWorkArea::focusOutEvent(QFocusEvent * /*event*/)
 549 {
 550         stopBlinkingCursor();
 551 }
 552
 553
 554 void GuiWorkArea::mousePressEvent(QMouseEvent * e)
 555 {
 556         if (dc_event_.active && dc_event_ == *e) {
 557                 dc_event_.active = false;
 558                 FuncRequest cmd(LFUN_MOUSE_TRIPLE, e->x(), e->y(),
 559                         q_button_state(e->button()));
 560                 dispatch(cmd);
 561                 return;
 562         }
 563
 564         inputContext()->reset();
 565
 566         FuncRequest const cmd(LFUN_MOUSE_PRESS, e->x(), e->y(),
 567                 q_button_state(e->button()));
 568         dispatch(cmd, q_key_state(e->modifiers()));
 569 }
 570
 571
 572 void GuiWorkArea::mouseReleaseEvent(QMouseEvent * e)
 573 {
 574         if (synthetic_mouse_event_.timeout.running())
 575                 synthetic_mouse_event_.timeout.stop();
 576
 577         FuncRequest const cmd(LFUN_MOUSE_RELEASE, e->x(), e->y(),
 578                               q_button_state(e->button()));
 579         dispatch(cmd);
 580 }
 581
 582
 583 void GuiWorkArea::mouseMoveEvent(QMouseEvent * e)
 584 {
 585         // we kill the triple click if we move
 586         doubleClickTimeout();
 587         FuncRequest cmd(LFUN_MOUSE_MOTION, e->x(), e->y(),
 588                               q_motion_state(e->buttons()));
 589
 590         // If we're above or below the work area...
 591         if (e->y() <= 20 || e->y() >= viewport()->height() - 20) {
 592                 // Make sure only a synthetic event can cause a page scroll,
 593                 // so they come at a steady rate:
 594                 if (e->y() <= 20)
 595                         // _Force_ a scroll up:
 596                         cmd.y = -40;
 597                 else
 598                         cmd.y = viewport()->height();
 599                 // Store the event, to be handled when the timeout expires.
 600                 synthetic_mouse_event_.cmd = cmd;
 601
 602                 if (synthetic_mouse_event_.timeout.running())
 603                         // Discard the event. Note that it _may_ be handled
 604                         // when the timeout expires if
 605                         // synthetic_mouse_event_.cmd has not been overwritten.
 606                         // Ie, when the timeout expires, we handle the
 607                         // most recent event but discard all others that
 608                         // occurred after the one used to start the timeout
 609                         // in the first place.
 610                         return;
 611                 else {
 612                         synthetic_mouse_event_.restart_timeout = true;
 613                         synthetic_mouse_event_.timeout.start();
 614                         // Fall through to handle this event...
 615                 }
 616
 617         } else if (synthetic_mouse_event_.timeout.running()) {
 618                 // Store the event, to be possibly handled when the timeout
 619                 // expires.
 620                 // Once the timeout has expired, normal control is returned
 621                 // to mouseMoveEvent (restart_timeout = false).
 622                 // This results in a much smoother 'feel' when moving the
 623                 // mouse back into the work area.
 624                 synthetic_mouse_event_.cmd = cmd;
 625                 synthetic_mouse_event_.restart_timeout = false;
 626                 return;
 627         }
 628
 629         // Has anything changed on-screen since the last QMouseEvent
 630         // was received?
 631         double const scrollbar_value = verticalScrollBar()->value();
 632         if (e->x() != synthetic_mouse_event_.x_old ||
 633             e->y() != synthetic_mouse_event_.y_old ||
 634             scrollbar_value != synthetic_mouse_event_.scrollbar_value_old) {
 635                 // Yes it has. Store the params used to check this.
 636                 synthetic_mouse_event_.x_old = e->x();
 637                 synthetic_mouse_event_.y_old = e->y();
 638                 synthetic_mouse_event_.scrollbar_value_old = scrollbar_value;
 639
 640                 // ... and dispatch the event to the LyX core.
 641                 dispatch(cmd);
 642         }
 643 }
 644
 645
 646 void GuiWorkArea::wheelEvent(QWheelEvent * e)
 647 {
 648         // Wheel rotation by one notch results in a delta() of 120 (see
 649         // documentation of QWheelEvent)
 650         int const lines = qApp->wheelScrollLines() * e->delta() / 120;
 651         verticalScrollBar()->setValue(verticalScrollBar()->value() -
 652                         lines *  verticalScrollBar()->singleStep());
 653         adjustViewWithScrollBar();
 654 }
 655
 656
 657 void GuiWorkArea::generateSyntheticMouseEvent()
 658 {
 659 // Set things off to generate the _next_ 'pseudo' event.
 660         if (synthetic_mouse_event_.restart_timeout)
 661                 synthetic_mouse_event_.timeout.start();
 662
 663         // Has anything changed on-screen since the last timeout signal
 664         // was received?
 665         double const scrollbar_value = verticalScrollBar()->value();
 666         if (scrollbar_value != synthetic_mouse_event_.scrollbar_value_old) {
 667                 // Yes it has. Store the params used to check this.
 668                 synthetic_mouse_event_.scrollbar_value_old = scrollbar_value;
 669
 670                 // ... and dispatch the event to the LyX core.
 671                 dispatch(synthetic_mouse_event_.cmd);
 672         }
 673 }
 674
 675
 676 void GuiWorkArea::keyPressEvent(QKeyEvent * ev)
 677 {
 678         // do nothing if there are other events
 679         // (the auto repeated events come too fast)
 680         // \todo FIXME: remove hard coded Qt keys, process the key binding
 681 #ifdef Q_WS_X11
 682         if (XEventsQueued(QX11Info::display(), 0) > 1 && ev->isAutoRepeat()
 683                         && (Qt::Key_PageDown || Qt::Key_PageUp)) {
 684                 LYXERR(Debug::KEY)
 685                         << BOOST_CURRENT_FUNCTION << endl
 686                         << "system is busy: scroll key event ignored" << endl;
 687                 ev->ignore();
 688                 return;
 689         }
 690 #endif
 691
 692         LYXERR(Debug::KEY) << BOOST_CURRENT_FUNCTION
 693                 << " count=" << ev->count()
 694                 << " text=" << fromqstr(ev->text())
 695                 << " isAutoRepeat=" << ev->isAutoRepeat()
 696                 << " key=" << ev->key()
 697                 << endl;
 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         /*
 740         LYXERR(Debug::PAINTING) << "paintEvent begin: x: " << rc.x()
 741                 << " y: " << rc.y()
 742                 << " w: " << rc.width()
 743                 << " h: " << rc.height() << endl;
 744         */
 745
 746         if (need_resize_) {
 747                 verticalScrollBar()->setPageStep(viewport()->height());
 748                 screen_ = QPixmap(viewport()->width(), viewport()->height());
 749                 resizeBufferView();
 750                 updateScreen();
 751                 hideCursor();
 752                 showCursor();
 753                 need_resize_ = false;
 754         }
 755
 756         QPainter pain(viewport());
 757         pain.drawPixmap(rc, screen_, rc);
 758         cursor_->draw(pain);
 759 }
 760
 761
 762 void GuiWorkArea::expose(int x, int y, int w, int h)
 763 {
 764         updateScreen();
 765         update(x, y, w, h);
 766 }
 767
 768
 769 void GuiWorkArea::setWindowTitle(docstring const & t, docstring const & it)
 770 {
 771         QString title = windowTitle();
 772         QString new_title = toqstr(t);
 773         if (title == new_title)
 774                 return;
 775
 776         QWidget::setWindowTitle(new_title);
 777         QWidget::setWindowIconText(toqstr(it));
 778         titleChanged(this);
 779 }
 780
 781
 782 void GuiWorkArea::updateScreen()
 783 {
 784         GuiPainter pain(&screen_);
 785         verticalScrollBar()->show();
 786         buffer_view_->draw(pain);
 787 }
 788
 789
 790 void GuiWorkArea::showCursor(int x, int y, int h, CursorShape shape)
 791 {
 792         if (schedule_redraw_) {
 793                 buffer_view_->updateMetrics();
 794                 updateScreen();
 795                 viewport()->update(QRect(0, 0, viewport()->width(), viewport()->height()));
 796                 schedule_redraw_ = false;
 797                 // Show the cursor immediately after the update.
 798                 hideCursor();
 799                 toggleCursor();
 800                 return;
 801         }
 802
 803         cursor_->update(x, y, h, shape);
 804         cursor_->show();
 805         viewport()->update(cursor_->rect());
 806 }
 807
 808
 809 void GuiWorkArea::removeCursor()
 810 {
 811         cursor_->hide();
 812         //if (!qApp->focusWidget())
 813                 viewport()->update(cursor_->rect());
 814 }
 815
 816
 817 void GuiWorkArea::inputMethodEvent(QInputMethodEvent * e)
 818 {
 819         QString const & commit_string = e->commitString();
 820         docstring const & preedit_string
 821                 = qstring_to_ucs4(e->preeditString());
 822
 823         if (!commit_string.isEmpty()) {
 824
 825                 LYXERR(Debug::KEY) << BOOST_CURRENT_FUNCTION
 826                         << " preeditString =" << fromqstr(e->preeditString())
 827                         << " commitString  =" << fromqstr(e->commitString())
 828                         << endl;
 829
 830                 int key = 0;
 831
 832                 // FIXME Iwami 04/01/07: we should take care also of UTF16 surrogates here.
 833                 for (int i = 0; i < commit_string.size(); ++i) {
 834                         QKeyEvent ev(QEvent::KeyPress, key, Qt::NoModifier, commit_string[i]);
 835                         keyPressEvent(&ev);
 836                 }
 837         }
 838
 839         // Hide the cursor during the kana-kanji transformation.
 840         if (preedit_string.empty())
 841                 startBlinkingCursor();
 842         else
 843                 stopBlinkingCursor();
 844
 845         // last_width : for checking if last preedit string was/wasn't empty.
 846         static bool last_width = false;
 847         if (!last_width && preedit_string.empty()) {
 848                 // if last_width is last length of preedit string.
 849                 e->accept();
 850                 return;
 851         }
 852
 853         GuiPainter pain(&screen_);
 854         buffer_view_->updateMetrics();
 855         buffer_view_->draw(pain);
 856         FontInfo font = buffer_view_->cursor().getFont().fontInfo();
 857         FontMetrics const & fm = theFontMetrics(font);
 858         int height = fm.maxHeight();
 859         int cur_x = cursor_->rect().left();
 860         int cur_y = cursor_->rect().bottom();
 861
 862         // redraw area of preedit string.
 863         update(0, cur_y - height, GuiWorkArea::width(),
 864                 (height + 1) * preedit_lines_);
 865
 866         if (preedit_string.empty()) {
 867                 last_width = false;
 868                 preedit_lines_ = 1;
 869                 e->accept();
 870                 return;
 871         }
 872         last_width = true;
 873
 874         // att : stores an IM attribute.
 875         QList<QInputMethodEvent::Attribute> const & att = e->attributes();
 876
 877         // get attributes of input method cursor.
 878         // cursor_pos : cursor position in preedit string.
 879         size_t cursor_pos = 0;
 880         bool cursor_is_visible = false;
 881         for (int i = 0; i < att.size(); ++i) {
 882                 if (att.at(i).type == QInputMethodEvent::Cursor) {
 883                         cursor_pos = att.at(i).start;
 884                         cursor_is_visible = att.at(i).length != 0;
 885                         break;
 886                 }
 887         }
 888
 889         size_t preedit_length = preedit_string.length();
 890
 891         // get position of selection in input method.
 892         // FIXME: isn't there a way to do this simplier?
 893         // rStart : cursor position in selected string in IM.
 894         size_t rStart = 0;
 895         // rLength : selected string length in IM.
 896         size_t rLength = 0;
 897         if (cursor_pos < preedit_length) {
 898                 for (int i = 0; i < att.size(); ++i) {
 899                         if (att.at(i).type == QInputMethodEvent::TextFormat) {
 900                                 if (att.at(i).start <= int(cursor_pos)
 901                                         && int(cursor_pos) < att.at(i).start + att.at(i).length) {
 902                                                 rStart = att.at(i).start;
 903                                                 rLength = att.at(i).length;
 904                                                 if (!cursor_is_visible)
 905                                                         cursor_pos += rLength;
 906                                                 break;
 907                                 }
 908                         }
 909                 }
 910         }
 911         else {
 912                 rStart = cursor_pos;
 913                 rLength = 0;
 914         }
 915
 916         int const right_margin = rightMargin();
 917         Painter::preedit_style ps;
 918         // Most often there would be only one line:
 919         preedit_lines_ = 1;
 920         for (size_t pos = 0; pos != preedit_length; ++pos) {
 921                 char_type const typed_char = preedit_string[pos];
 922                 // reset preedit string style
 923                 ps = Painter::preedit_default;
 924
 925                 // if we reached the right extremity of the screen, go to next line.
 926                 if (cur_x + fm.width(typed_char) > GuiWorkArea::width() - right_margin) {
 927                         cur_x = right_margin;
 928                         cur_y += height + 1;
 929                         ++preedit_lines_;
 930                 }
 931                 // preedit strings are displayed with dashed underline
 932                 // and partial strings are displayed white on black indicating
 933                 // that we are in selecting mode in the input method.
 934                 // FIXME: rLength == preedit_length is not a changing condition
 935                 // FIXME: should be put out of the loop.
 936                 if (pos >= rStart
 937                         && pos < rStart + rLength
 938                         && !(cursor_pos < rLength && rLength == preedit_length))
 939                         ps = Painter::preedit_selecting;
 940
 941                 if (pos == cursor_pos
 942                         && (cursor_pos < rLength && rLength == preedit_length))
 943                         ps = Painter::preedit_cursor;
 944
 945                 // draw one character and update cur_x.
 946                 cur_x += pain.preeditText(cur_x, cur_y, typed_char, font, ps);
 947         }
 948
 949         // update the preedit string screen area.
 950         update(0, cur_y - preedit_lines_*height, GuiWorkArea::width(),
 951                 (height + 1) * preedit_lines_);
 952
 953         // Don't forget to accept the event!
 954         e->accept();
 955 }
 956
 957
 958 QVariant GuiWorkArea::inputMethodQuery(Qt::InputMethodQuery query) const
 959 {
 960         QRect cur_r(0,0,0,0);
 961         switch (query) {
 962                 // this is the CJK-specific composition window position.
 963                 case Qt::ImMicroFocus:
 964                         cur_r = cursor_->rect();
 965                         if (preedit_lines_ != 1)
 966                                 cur_r.moveLeft(10);
 967                         cur_r.moveBottom(cur_r.bottom() + cur_r.height() * preedit_lines_);
 968                         // return lower right of cursor in LyX.
 969                         return cur_r;
 970                 default:
 971                         return QWidget::inputMethodQuery(query);
 972         }
 973 }
 974
 975
 976 void GuiWorkArea::updateWindowTitle()
 977 {
 978         docstring maximize_title;
 979         docstring minimize_title;
 980
 981         Buffer & buf = buffer_view_->buffer();
 982         FileName const fileName = buf.fileName();
 983         if (!fileName.empty()) {
 984                 maximize_title = fileName.displayName(30);
 985                 minimize_title = from_utf8(fileName.onlyFileName());
 986                 if (!buf.isClean()) {
 987                         maximize_title += _(" (changed)");
 988                         minimize_title += char_type('*');
 989                 }
 990                 if (buf.isReadonly())
 991                         maximize_title += _(" (read only)");
 992         }
 993
 994         setWindowTitle(maximize_title, minimize_title);
 995 }
 996
 997
 998 void GuiWorkArea::setReadOnly(bool)
 999 {
1000         updateWindowTitle();
1001         if (this == lyx_view_->currentWorkArea())
1002                 lyx_view_->getDialogs().updateBufferDependent(false);
1003 }
1004
1005
1006 ////////////////////////////////////////////////////////////////////
1007 //
1008 // TabWorkArea
1009 //
1010 ////////////////////////////////////////////////////////////////////
1011
1012 TabWorkArea::TabWorkArea(QWidget * parent) : QTabWidget(parent)
1013 {
1014         QPalette pal = palette();
1015         pal.setColor(QPalette::Active, QPalette::Button,
1016                 pal.color(QPalette::Active, QPalette::Window));
1017         pal.setColor(QPalette::Disabled, QPalette::Button,
1018                 pal.color(QPalette::Disabled, QPalette::Window));
1019         pal.setColor(QPalette::Inactive, QPalette::Button,
1020                 pal.color(QPalette::Inactive, QPalette::Window));
1021
1022         QToolButton * closeTabButton = new QToolButton(this);
1023     closeTabButton->setPalette(pal);
1024         closeTabButton->setIcon(QIcon(":/images/closetab.png"));
1025         closeTabButton->setText("Close");
1026         closeTabButton->setAutoRaise(true);
1027         closeTabButton->setCursor(Qt::ArrowCursor);
1028         closeTabButton->setToolTip(tr("Close tab"));
1029         closeTabButton->setEnabled(true);
1030
1031         QObject::connect(this, SIGNAL(currentChanged(int)),
1032                 this, SLOT(on_currentTabChanged(int)));
1033         QObject::connect(closeTabButton, SIGNAL(clicked()),
1034                 this, SLOT(closeCurrentTab()));
1035
1036         setCornerWidget(closeTabButton);
1037 #if QT_VERSION >= 0x040200
1038         setUsesScrollButtons(true);
1039 #endif
1040 }
1041
1042
1043 void TabWorkArea::showBar(bool show)
1044 {
1045         tabBar()->setVisible(show);
1046 }
1047
1048
1049 GuiWorkArea * TabWorkArea::currentWorkArea()
1050 {
1051         if (count() == 0)
1052                 return 0;
1053
1054         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(currentWidget());
1055         BOOST_ASSERT(wa);
1056         return wa;
1057 }
1058
1059
1060 GuiWorkArea * TabWorkArea::workArea(Buffer & buffer)
1061 {
1062         for (int i = 0; i != count(); ++i) {
1063                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i));
1064                 BOOST_ASSERT(wa);
1065                 if (&wa->bufferView().buffer() == &buffer)
1066                         return wa;
1067         }
1068         return 0;
1069 }
1070
1071
1072 void TabWorkArea::closeAll()
1073 {
1074         while (count()) {
1075                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(0));
1076                 BOOST_ASSERT(wa);
1077                 removeTab(0);
1078                 delete wa;
1079         }
1080 }
1081
1082
1083 bool TabWorkArea::setCurrentWorkArea(GuiWorkArea * work_area)
1084 {
1085         BOOST_ASSERT(work_area);
1086         int index = indexOf(work_area);
1087         if (index == -1)
1088                 return false;
1089
1090         if (index == currentIndex())
1091                 // Make sure the work area is up to date.
1092                 on_currentTabChanged(index);
1093         else
1094                 // Switch to the work area.
1095                 setCurrentIndex(index);
1096         work_area->setFocus();
1097
1098         return true;
1099 }
1100
1101
1102 bool TabWorkArea::removeWorkArea(GuiWorkArea * work_area)
1103 {
1104         BOOST_ASSERT(work_area);
1105         int index = indexOf(work_area);
1106         if (index == -1)
1107                 return false;
1108
1109         work_area->setUpdatesEnabled(false);
1110         removeTab(index);
1111         delete work_area;
1112
1113         if (count()) {
1114                 // make sure the next work area is enabled.
1115                 currentWidget()->setUpdatesEnabled(true);
1116                 // Hide tabbar if there's only one tab.
1117                 showBar(count() > 1);
1118         }
1119         return true;
1120 }
1121
1122
1123 void TabWorkArea::on_currentTabChanged(int i)
1124 {
1125         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i));
1126         BOOST_ASSERT(wa);
1127         BufferView & bv = wa->bufferView();
1128         bv.updateMetrics();
1129         bv.cursor().fixIfBroken();
1130         wa->setUpdatesEnabled(true);
1131         wa->redraw();
1132         wa->setFocus();
1133         ///
1134         currentWorkAreaChanged(wa);
1135
1136         LYXERR(Debug::GUI) << "currentTabChanged " << i
1137                 << "File" << bv.buffer().absFileName() << endl;
1138 }
1139
1140
1141 void TabWorkArea::closeCurrentTab()
1142 {
1143         lyx::dispatch(FuncRequest(LFUN_BUFFER_CLOSE));
1144 }
1145
1146
1147 void TabWorkArea::updateTabText(GuiWorkArea * wa)
1148 {
1149         int const i = indexOf(wa);
1150         if (i < 0)
1151                 return;
1152         setTabText(i, wa->windowTitle());
1153 }
1154
1155 } // namespace frontend
1156 } // namespace lyx
1157
1158 #include "GuiWorkArea_moc.cpp"