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 "GuiView.h"
  29 #include "KeySymbol.h"
  30 #include "Language.h"
  31 #include "LyXFunc.h"
  32 #include "LyXRC.h"
  33 #include "MetricsInfo.h"
  34 #include "qt_helpers.h"
  35 #include "version.h"
  36
  37 #include "graphics/GraphicsImage.h"
  38 #include "graphics/GraphicsLoader.h"
  39
  40 #include "support/FileName.h"
  41 #include "support/ForkedcallsController.h"
  42
  43 #include "frontends/Application.h"
  44 #include "frontends/Dialogs.h"  // only used in setReadOnly
  45 #include "frontends/FontMetrics.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
 203 GuiWorkArea::GuiWorkArea(Buffer & buffer, GuiView & lv)
 204         : buffer_view_(new BufferView(buffer)), lyx_view_(&lv),
 205           cursor_visible_(false), cursor_timeout_(400),
 206     need_resize_(false), schedule_redraw_(false),
 207                 preedit_lines_(1)
 208 {
 209         buffer.workAreaManager().add(this);
 210         // Setup the signals
 211         timecon = cursor_timeout_.timeout
 212                 .connect(boost::bind(&GuiWorkArea::toggleCursor, this));
 213
 214         cursor_timeout_.start();
 215
 216         screen_ = QPixmap(viewport()->width(), viewport()->height());
 217         cursor_ = new frontend::CursorWidget();
 218         cursor_->hide();
 219
 220         setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
 221         setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 222         setAcceptDrops(true);
 223         setMouseTracking(true);
 224         setMinimumSize(100, 70);
 225         updateWindowTitle();
 226
 227         viewport()->setAutoFillBackground(false);
 228         // We don't need double-buffering nor SystemBackground on
 229         // the viewport because we have our own backing pixmap.
 230         viewport()->setAttribute(Qt::WA_NoSystemBackground);
 231
 232         setFocusPolicy(Qt::WheelFocus);
 233
 234         viewport()->setCursor(Qt::IBeamCursor);
 235
 236         synthetic_mouse_event_.timeout.timeout.connect(
 237                 boost::bind(&GuiWorkArea::generateSyntheticMouseEvent,
 238                                         this));
 239
 240         // Initialize the vertical Scroll Bar
 241         QObject::connect(verticalScrollBar(), SIGNAL(actionTriggered(int)),
 242                 this, SLOT(adjustViewWithScrollBar(int)));
 243
 244         // disable context menu for the scrollbar
 245         verticalScrollBar()->setContextMenuPolicy(Qt::NoContextMenu);
 246
 247         // PageStep only depends on the viewport height.
 248         verticalScrollBar()->setPageStep(viewport()->height());
 249
 250         LYXERR(Debug::GUI) << BOOST_CURRENT_FUNCTION
 251                 << "\n Area width\t" << width()
 252                 << "\n Area height\t" << height()
 253                 << "\n viewport width\t" << viewport()->width()
 254                 << "\n viewport height\t" << viewport()->height()
 255                 << endl;
 256
 257         // Enables input methods for asian languages.
 258         // Must be set when creating custom text editing widgets.
 259         setAttribute(Qt::WA_InputMethodEnabled, true);
 260 }
 261
 262
 263
 264 GuiWorkArea::~GuiWorkArea()
 265 {
 266         buffer_view_->buffer().workAreaManager().remove(this);
 267         delete buffer_view_;
 268 }
 269
 270
 271 void GuiWorkArea::close()
 272 {
 273         lyx_view_->removeWorkArea(this);
 274 }
 275
 276
 277 BufferView & GuiWorkArea::bufferView()
 278 {
 279         return *buffer_view_;
 280 }
 281
 282
 283 BufferView const & GuiWorkArea::bufferView() const
 284 {
 285         return *buffer_view_;
 286 }
 287
 288
 289 void GuiWorkArea::stopBlinkingCursor()
 290 {
 291         cursor_timeout_.stop();
 292         hideCursor();
 293 }
 294
 295
 296 void GuiWorkArea::startBlinkingCursor()
 297 {
 298         showCursor();
 299         cursor_timeout_.restart();
 300 }
 301
 302
 303 void GuiWorkArea::redraw()
 304 {
 305         if (!isVisible())
 306                 // No need to redraw in this case.
 307                 return;
 308
 309         // No need to do anything if this is the current view. The BufferView
 310         // metrics are already up to date.
 311         if (lyx_view_ != theApp()->currentView()) {
 312                 // FIXME: it would be nice to optimize for the off-screen case.
 313                 buffer_view_->updateMetrics();
 314                 buffer_view_->cursor().fixIfBroken();
 315         }
 316
 317         updateScrollbar();
 318
 319         // update cursor position, because otherwise it has to wait until
 320         // the blinking interval is over
 321         if (cursor_visible_) {
 322                 hideCursor();
 323                 showCursor();
 324         }
 325
 326         ViewMetricsInfo const & vi = buffer_view_->viewMetricsInfo();
 327
 328         LYXERR(Debug::WORKAREA) << "WorkArea::redraw screen" << endl;
 329
 330         int const ymin = std::max(vi.y1, 0);
 331         int const ymax = vi.p2 < vi.size - 1 ? vi.y2 : height();
 332
 333         expose(0, ymin, width(), ymax - ymin);
 334
 335         //LYXERR(Debug::WORKAREA)
 336         //<< "  ymin = " << ymin << "  width() = " << width()
 337 //              << "  ymax-ymin = " << ymax-ymin << std::endl;
 338
 339         if (lyxerr.debugging(Debug::WORKAREA))
 340                 buffer_view_->coordCache().dump();
 341 }
 342
 343
 344 void GuiWorkArea::processKeySym(KeySymbol const & key, KeyModifier mod)
 345 {
 346         // In order to avoid bad surprise in the middle of an operation,
 347         // we better stop the blinking cursor.
 348         stopBlinkingCursor();
 349
 350         theLyXFunc().setLyXView(lyx_view_);
 351         theLyXFunc().processKeySym(key, mod);
 352 }
 353
 354
 355 void GuiWorkArea::dispatch(FuncRequest const & cmd0, KeyModifier mod)
 356 {
 357         // Handle drag&drop
 358         if (cmd0.action == LFUN_FILE_OPEN) {
 359                 lyx_view_->dispatch(cmd0);
 360                 return;
 361         }
 362
 363         theLyXFunc().setLyXView(lyx_view_);
 364
 365         FuncRequest cmd;
 366
 367         if (cmd0.action == LFUN_MOUSE_PRESS) {
 368                 if (mod == ShiftModifier)
 369                         cmd = FuncRequest(cmd0, "region-select");
 370                 else if (mod == ControlModifier)
 371                         cmd = FuncRequest(cmd0, "paragraph-select");
 372                 else
 373                         cmd = cmd0;
 374         }
 375         else
 376                 cmd = cmd0;
 377
 378         // In order to avoid bad surprise in the middle of an operation, we better stop
 379         // the blinking cursor.
 380         if (!(cmd.action == LFUN_MOUSE_MOTION
 381                 && cmd.button() == mouse_button::none))
 382                 stopBlinkingCursor();
 383
 384         buffer_view_->mouseEventDispatch(cmd);
 385
 386         // Skip these when selecting
 387         if (cmd.action != LFUN_MOUSE_MOTION) {
 388                 lyx_view_->updateLayoutChoice(false);
 389                 lyx_view_->updateToolbars();
 390         }
 391
 392         // GUI tweaks except with mouse motion with no button pressed.
 393         if (!(cmd.action == LFUN_MOUSE_MOTION
 394                 && cmd.button() == mouse_button::none)) {
 395                 // Slight hack: this is only called currently when we
 396                 // clicked somewhere, so we force through the display
 397                 // of the new status here.
 398                 lyx_view_->clearMessage();
 399
 400                 // Show the cursor immediately after any operation.
 401                 startBlinkingCursor();
 402         }
 403 }
 404
 405
 406 void GuiWorkArea::resizeBufferView()
 407 {
 408         // WARNING: Please don't put any code that will trigger a repaint here!
 409         // We are already inside a paint event.
 410         lyx_view_->setBusy(true);
 411         buffer_view_->resize(width(), height());
 412         lyx_view_->updateLayoutChoice(false);
 413         lyx_view_->setBusy(false);
 414 }
 415
 416
 417 void GuiWorkArea::updateScrollbar()
 418 {
 419         buffer_view_->updateScrollbar();
 420         ScrollbarParameters const & scroll_ = buffer_view_->scrollbarParameters();
 421         setScrollbarParams(scroll_.height, scroll_.position,
 422                 scroll_.lineScrollHeight);
 423 }
 424
 425
 426 void GuiWorkArea::showCursor()
 427 {
 428         if (cursor_visible_)
 429                 return;
 430
 431         CursorShape shape = BAR_SHAPE;
 432
 433         Font const & realfont = buffer_view_->cursor().real_current_font;
 434         BufferParams const & bp = buffer_view_->buffer().params();
 435         bool const samelang = realfont.language() == bp.language;
 436         bool const isrtl = realfont.isVisibleRightToLeft();
 437
 438         if (!samelang || isrtl != bp.language->rightToLeft()) {
 439                 shape = L_SHAPE;
 440                 if (isrtl)
 441                         shape = REVERSED_L_SHAPE;
 442         }
 443
 444         // The ERT language hack needs fixing up
 445         if (realfont.language() == latex_language)
 446                 shape = BAR_SHAPE;
 447
 448         Font const font = buffer_view_->cursor().getFont();
 449         FontMetrics const & fm = theFontMetrics(font);
 450         int const asc = fm.maxAscent();
 451         int const des = fm.maxDescent();
 452         int h = asc + des;
 453         int x = 0;
 454         int y = 0;
 455         buffer_view_->cursor().getPos(x, y);
 456         y -= asc;
 457
 458         // if it doesn't touch the screen, don't try to show it
 459         if (y + h < 0 || y >= height())
 460                 return;
 461
 462         cursor_visible_ = true;
 463         showCursor(x, y, h, shape);
 464 }
 465
 466
 467 void GuiWorkArea::hideCursor()
 468 {
 469         if (!cursor_visible_)
 470                 return;
 471
 472         cursor_visible_ = false;
 473         removeCursor();
 474 }
 475
 476
 477 void GuiWorkArea::toggleCursor()
 478 {
 479         if (cursor_visible_)
 480                 hideCursor();
 481         else
 482                 showCursor();
 483
 484         // Use this opportunity to deal with any child processes that
 485         // have finished but are waiting to communicate this fact
 486         // to the rest of LyX.
 487         ForkedcallsController & fcc = ForkedcallsController::get();
 488         fcc.handleCompletedProcesses();
 489
 490         cursor_timeout_.restart();
 491 }
 492
 493
 494 void GuiWorkArea::setScrollbarParams(int h, int scroll_pos, int scroll_line_step)
 495 {
 496         if (verticalScrollBarPolicy() != Qt::ScrollBarAlwaysOn)
 497                 setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
 498
 499         verticalScrollBar()->setTracking(false);
 500
 501         // do what cursor movement does (some grey)
 502         h += height() / 4;
 503         int scroll_max_ = std::max(0, h - height());
 504
 505         verticalScrollBar()->setRange(0, scroll_max_);
 506         verticalScrollBar()->setSliderPosition(scroll_pos);
 507         verticalScrollBar()->setSingleStep(scroll_line_step);
 508         verticalScrollBar()->setValue(scroll_pos);
 509
 510         verticalScrollBar()->setTracking(true);
 511 }
 512
 513
 514 void GuiWorkArea::adjustViewWithScrollBar(int action)
 515 {
 516         stopBlinkingCursor();
 517         if (action == QAbstractSlider::SliderPageStepAdd)
 518                 buffer_view_->scrollDown(viewport()->height());
 519         else if (action == QAbstractSlider::SliderPageStepSub)
 520                 buffer_view_->scrollUp(viewport()->height());
 521         else
 522                 buffer_view_->scrollDocView(verticalScrollBar()->sliderPosition());
 523
 524         if (lyxrc.cursor_follows_scrollbar) {
 525                 buffer_view_->setCursorFromScrollbar();
 526                 lyx_view_->updateLayoutChoice(false);
 527         }
 528         // Show the cursor immediately after any operation.
 529         startBlinkingCursor();
 530         QApplication::syncX();
 531 }
 532
 533
 534 void GuiWorkArea::focusInEvent(QFocusEvent * /*event*/)
 535 {
 536         // Repaint the whole screen.
 537         // Note: this is different from redraw() as only the backing pixmap
 538         // will be redrawn, which is cheap.
 539         viewport()->repaint();
 540
 541         startBlinkingCursor();
 542 }
 543
 544
 545 void GuiWorkArea::focusOutEvent(QFocusEvent * /*event*/)
 546 {
 547         stopBlinkingCursor();
 548 }
 549
 550
 551 void GuiWorkArea::mousePressEvent(QMouseEvent * e)
 552 {
 553         if (dc_event_.active && dc_event_ == *e) {
 554                 dc_event_.active = false;
 555                 FuncRequest cmd(LFUN_MOUSE_TRIPLE, e->x(), e->y(),
 556                         q_button_state(e->button()));
 557                 dispatch(cmd);
 558                 return;
 559         }
 560
 561         inputContext()->reset();
 562
 563         FuncRequest const cmd(LFUN_MOUSE_PRESS, e->x(), e->y(),
 564                 q_button_state(e->button()));
 565         dispatch(cmd, q_key_state(e->modifiers()));
 566 }
 567
 568
 569 void GuiWorkArea::mouseReleaseEvent(QMouseEvent * e)
 570 {
 571         if (synthetic_mouse_event_.timeout.running())
 572                 synthetic_mouse_event_.timeout.stop();
 573
 574         FuncRequest const cmd(LFUN_MOUSE_RELEASE, e->x(), e->y(),
 575                               q_button_state(e->button()));
 576         dispatch(cmd);
 577 }
 578
 579
 580 void GuiWorkArea::mouseMoveEvent(QMouseEvent * e)
 581 {
 582         // we kill the triple click if we move
 583         doubleClickTimeout();
 584         FuncRequest cmd(LFUN_MOUSE_MOTION, e->x(), e->y(),
 585                               q_motion_state(e->buttons()));
 586
 587         // If we're above or below the work area...
 588         if (e->y() <= 20 || e->y() >= viewport()->height() - 20) {
 589                 // Make sure only a synthetic event can cause a page scroll,
 590                 // so they come at a steady rate:
 591                 if (e->y() <= 20)
 592                         // _Force_ a scroll up:
 593                         cmd.y = -40;
 594                 else
 595                         cmd.y = viewport()->height();
 596                 // Store the event, to be handled when the timeout expires.
 597                 synthetic_mouse_event_.cmd = cmd;
 598
 599                 if (synthetic_mouse_event_.timeout.running())
 600                         // Discard the event. Note that it _may_ be handled
 601                         // when the timeout expires if
 602                         // synthetic_mouse_event_.cmd has not been overwritten.
 603                         // Ie, when the timeout expires, we handle the
 604                         // most recent event but discard all others that
 605                         // occurred after the one used to start the timeout
 606                         // in the first place.
 607                         return;
 608                 else {
 609                         synthetic_mouse_event_.restart_timeout = true;
 610                         synthetic_mouse_event_.timeout.start();
 611                         // Fall through to handle this event...
 612                 }
 613
 614         } else if (synthetic_mouse_event_.timeout.running()) {
 615                 // Store the event, to be possibly handled when the timeout
 616                 // expires.
 617                 // Once the timeout has expired, normal control is returned
 618                 // to mouseMoveEvent (restart_timeout = false).
 619                 // This results in a much smoother 'feel' when moving the
 620                 // mouse back into the work area.
 621                 synthetic_mouse_event_.cmd = cmd;
 622                 synthetic_mouse_event_.restart_timeout = false;
 623                 return;
 624         }
 625
 626         // Has anything changed on-screen since the last QMouseEvent
 627         // was received?
 628         double const scrollbar_value = verticalScrollBar()->value();
 629         if (e->x() != synthetic_mouse_event_.x_old ||
 630             e->y() != synthetic_mouse_event_.y_old ||
 631             scrollbar_value != synthetic_mouse_event_.scrollbar_value_old) {
 632                 // Yes it has. Store the params used to check this.
 633                 synthetic_mouse_event_.x_old = e->x();
 634                 synthetic_mouse_event_.y_old = e->y();
 635                 synthetic_mouse_event_.scrollbar_value_old = scrollbar_value;
 636
 637                 // ... and dispatch the event to the LyX core.
 638                 dispatch(cmd);
 639         }
 640 }
 641
 642
 643 void GuiWorkArea::wheelEvent(QWheelEvent * e)
 644 {
 645         // Wheel rotation by one notch results in a delta() of 120 (see
 646         // documentation of QWheelEvent)
 647         int const lines = qApp->wheelScrollLines() * e->delta() / 120;
 648         verticalScrollBar()->setValue(verticalScrollBar()->value() -
 649                         lines *  verticalScrollBar()->singleStep());
 650         adjustViewWithScrollBar();
 651 }
 652
 653
 654 void GuiWorkArea::generateSyntheticMouseEvent()
 655 {
 656 // Set things off to generate the _next_ 'pseudo' event.
 657         if (synthetic_mouse_event_.restart_timeout)
 658                 synthetic_mouse_event_.timeout.start();
 659
 660         // Has anything changed on-screen since the last timeout signal
 661         // was received?
 662         double const scrollbar_value = verticalScrollBar()->value();
 663         if (scrollbar_value != synthetic_mouse_event_.scrollbar_value_old) {
 664                 // Yes it has. Store the params used to check this.
 665                 synthetic_mouse_event_.scrollbar_value_old = scrollbar_value;
 666
 667                 // ... and dispatch the event to the LyX core.
 668                 dispatch(synthetic_mouse_event_.cmd);
 669         }
 670 }
 671
 672
 673 void GuiWorkArea::keyPressEvent(QKeyEvent * ev)
 674 {
 675         // do nothing if there are other events
 676         // (the auto repeated events come too fast)
 677         // \todo FIXME: remove hard coded Qt keys, process the key binding
 678 #ifdef Q_WS_X11
 679         if (XEventsQueued(QX11Info::display(), 0) > 1 && ev->isAutoRepeat()
 680                         && (Qt::Key_PageDown || Qt::Key_PageUp)) {
 681                 LYXERR(Debug::KEY)
 682                         << BOOST_CURRENT_FUNCTION << endl
 683                         << "system is busy: scroll key event ignored" << endl;
 684                 ev->ignore();
 685                 return;
 686         }
 687 #endif
 688
 689         LYXERR(Debug::KEY) << BOOST_CURRENT_FUNCTION
 690                 << " count=" << ev->count()
 691                 << " text=" << fromqstr(ev->text())
 692                 << " isAutoRepeat=" << ev->isAutoRepeat()
 693                 << " key=" << ev->key()
 694                 << endl;
 695
 696         KeySymbol sym;
 697         setKeySymbol(&sym, ev);
 698         processKeySym(sym, q_key_state(ev->modifiers()));
 699 }
 700
 701
 702 void GuiWorkArea::doubleClickTimeout()
 703 {
 704         dc_event_.active = false;
 705 }
 706
 707
 708 void GuiWorkArea::mouseDoubleClickEvent(QMouseEvent * ev)
 709 {
 710         dc_event_ = DoubleClick(ev);
 711         QTimer::singleShot(QApplication::doubleClickInterval(), this,
 712                            SLOT(doubleClickTimeout()));
 713         FuncRequest cmd(LFUN_MOUSE_DOUBLE,
 714                         ev->x(), ev->y(),
 715                         q_button_state(ev->button()));
 716         dispatch(cmd);
 717 }
 718
 719
 720 void GuiWorkArea::resizeEvent(QResizeEvent * ev)
 721 {
 722         QAbstractScrollArea::resizeEvent(ev);
 723         need_resize_ = true;
 724 }
 725
 726
 727 void GuiWorkArea::update(int x, int y, int w, int h)
 728 {
 729         viewport()->repaint(x, y, w, h);
 730 }
 731
 732
 733 void GuiWorkArea::paintEvent(QPaintEvent * ev)
 734 {
 735         QRect const rc = ev->rect();
 736         /*
 737         LYXERR(Debug::PAINTING) << "paintEvent begin: x: " << rc.x()
 738                 << " y: " << rc.y()
 739                 << " w: " << rc.width()
 740                 << " h: " << rc.height() << endl;
 741         */
 742
 743         if (need_resize_) {
 744                 verticalScrollBar()->setPageStep(viewport()->height());
 745                 screen_ = QPixmap(viewport()->width(), viewport()->height());
 746                 resizeBufferView();
 747                 updateScreen();
 748                 hideCursor();
 749                 showCursor();
 750                 need_resize_ = false;
 751         }
 752
 753         QPainter pain(viewport());
 754         pain.drawPixmap(rc, screen_, rc);
 755         cursor_->draw(pain);
 756 }
 757
 758
 759 void GuiWorkArea::expose(int x, int y, int w, int h)
 760 {
 761         updateScreen();
 762         update(x, y, w, h);
 763 }
 764
 765
 766 void GuiWorkArea::updateScreen()
 767 {
 768         GuiPainter pain(&screen_);
 769         verticalScrollBar()->show();
 770         buffer_view_->draw(pain);
 771 }
 772
 773
 774 void GuiWorkArea::showCursor(int x, int y, int h, CursorShape shape)
 775 {
 776         if (schedule_redraw_) {
 777                 buffer_view_->updateMetrics();
 778                 updateScreen();
 779                 viewport()->update(QRect(0, 0, viewport()->width(), viewport()->height()));
 780                 schedule_redraw_ = false;
 781                 // Show the cursor immediately after the update.
 782                 hideCursor();
 783                 toggleCursor();
 784                 return;
 785         }
 786
 787         cursor_->update(x, y, h, shape);
 788         cursor_->show();
 789         viewport()->update(cursor_->rect());
 790 }
 791
 792
 793 void GuiWorkArea::removeCursor()
 794 {
 795         cursor_->hide();
 796         //if (!qApp->focusWidget())
 797                 viewport()->update(cursor_->rect());
 798 }
 799
 800
 801 void GuiWorkArea::inputMethodEvent(QInputMethodEvent * e)
 802 {
 803         QString const & commit_string = e->commitString();
 804         docstring const & preedit_string
 805                 = qstring_to_ucs4(e->preeditString());
 806
 807         if (!commit_string.isEmpty()) {
 808
 809                 LYXERR(Debug::KEY) << BOOST_CURRENT_FUNCTION
 810                         << " preeditString =" << fromqstr(e->preeditString())
 811                         << " commitString  =" << fromqstr(e->commitString())
 812                         << endl;
 813
 814                 int key = 0;
 815
 816                 // FIXME Iwami 04/01/07: we should take care also of UTF16 surrogates here.
 817                 for (int i = 0; i < commit_string.size(); ++i) {
 818                         QKeyEvent ev(QEvent::KeyPress, key, Qt::NoModifier, commit_string[i]);
 819                         keyPressEvent(&ev);
 820                 }
 821         }
 822
 823         // Hide the cursor during the kana-kanji transformation.
 824         if (preedit_string.empty())
 825                 startBlinkingCursor();
 826         else
 827                 stopBlinkingCursor();
 828
 829         // last_width : for checking if last preedit string was/wasn't empty.
 830         static bool last_width = false;
 831         if (!last_width && preedit_string.empty()) {
 832                 // if last_width is last length of preedit string.
 833                 e->accept();
 834                 return;
 835         }
 836
 837         GuiPainter pain(&screen_);
 838         buffer_view_->updateMetrics();
 839         buffer_view_->draw(pain);
 840         FontInfo font = buffer_view_->cursor().getFont().fontInfo();
 841         FontMetrics const & fm = theFontMetrics(font);
 842         int height = fm.maxHeight();
 843         int cur_x = cursor_->rect().left();
 844         int cur_y = cursor_->rect().bottom();
 845
 846         // redraw area of preedit string.
 847         update(0, cur_y - height, GuiWorkArea::width(),
 848                 (height + 1) * preedit_lines_);
 849
 850         if (preedit_string.empty()) {
 851                 last_width = false;
 852                 preedit_lines_ = 1;
 853                 e->accept();
 854                 return;
 855         }
 856         last_width = true;
 857
 858         // att : stores an IM attribute.
 859         QList<QInputMethodEvent::Attribute> const & att = e->attributes();
 860
 861         // get attributes of input method cursor.
 862         // cursor_pos : cursor position in preedit string.
 863         size_t cursor_pos = 0;
 864         bool cursor_is_visible = false;
 865         for (int i = 0; i < att.size(); ++i) {
 866                 if (att.at(i).type == QInputMethodEvent::Cursor) {
 867                         cursor_pos = att.at(i).start;
 868                         cursor_is_visible = att.at(i).length != 0;
 869                         break;
 870                 }
 871         }
 872
 873         size_t preedit_length = preedit_string.length();
 874
 875         // get position of selection in input method.
 876         // FIXME: isn't there a way to do this simplier?
 877         // rStart : cursor position in selected string in IM.
 878         size_t rStart = 0;
 879         // rLength : selected string length in IM.
 880         size_t rLength = 0;
 881         if (cursor_pos < preedit_length) {
 882                 for (int i = 0; i < att.size(); ++i) {
 883                         if (att.at(i).type == QInputMethodEvent::TextFormat) {
 884                                 if (att.at(i).start <= int(cursor_pos)
 885                                         && int(cursor_pos) < att.at(i).start + att.at(i).length) {
 886                                                 rStart = att.at(i).start;
 887                                                 rLength = att.at(i).length;
 888                                                 if (!cursor_is_visible)
 889                                                         cursor_pos += rLength;
 890                                                 break;
 891                                 }
 892                         }
 893                 }
 894         }
 895         else {
 896                 rStart = cursor_pos;
 897                 rLength = 0;
 898         }
 899
 900         int const right_margin = rightMargin();
 901         Painter::preedit_style ps;
 902         // Most often there would be only one line:
 903         preedit_lines_ = 1;
 904         for (size_t pos = 0; pos != preedit_length; ++pos) {
 905                 char_type const typed_char = preedit_string[pos];
 906                 // reset preedit string style
 907                 ps = Painter::preedit_default;
 908
 909                 // if we reached the right extremity of the screen, go to next line.
 910                 if (cur_x + fm.width(typed_char) > GuiWorkArea::width() - right_margin) {
 911                         cur_x = right_margin;
 912                         cur_y += height + 1;
 913                         ++preedit_lines_;
 914                 }
 915                 // preedit strings are displayed with dashed underline
 916                 // and partial strings are displayed white on black indicating
 917                 // that we are in selecting mode in the input method.
 918                 // FIXME: rLength == preedit_length is not a changing condition
 919                 // FIXME: should be put out of the loop.
 920                 if (pos >= rStart
 921                         && pos < rStart + rLength
 922                         && !(cursor_pos < rLength && rLength == preedit_length))
 923                         ps = Painter::preedit_selecting;
 924
 925                 if (pos == cursor_pos
 926                         && (cursor_pos < rLength && rLength == preedit_length))
 927                         ps = Painter::preedit_cursor;
 928
 929                 // draw one character and update cur_x.
 930                 cur_x += pain.preeditText(cur_x, cur_y, typed_char, font, ps);
 931         }
 932
 933         // update the preedit string screen area.
 934         update(0, cur_y - preedit_lines_*height, GuiWorkArea::width(),
 935                 (height + 1) * preedit_lines_);
 936
 937         // Don't forget to accept the event!
 938         e->accept();
 939 }
 940
 941
 942 QVariant GuiWorkArea::inputMethodQuery(Qt::InputMethodQuery query) const
 943 {
 944         QRect cur_r(0,0,0,0);
 945         switch (query) {
 946                 // this is the CJK-specific composition window position.
 947                 case Qt::ImMicroFocus:
 948                         cur_r = cursor_->rect();
 949                         if (preedit_lines_ != 1)
 950                                 cur_r.moveLeft(10);
 951                         cur_r.moveBottom(cur_r.bottom() + cur_r.height() * preedit_lines_);
 952                         // return lower right of cursor in LyX.
 953                         return cur_r;
 954                 default:
 955                         return QWidget::inputMethodQuery(query);
 956         }
 957 }
 958
 959
 960 void GuiWorkArea::updateWindowTitle()
 961 {
 962         docstring maximize_title;
 963         docstring minimize_title;
 964
 965         Buffer & buf = buffer_view_->buffer();
 966         FileName const fileName = buf.fileName();
 967         if (!fileName.empty()) {
 968                 maximize_title = fileName.displayName(30);
 969                 minimize_title = from_utf8(fileName.onlyFileName());
 970                 if (!buf.isClean()) {
 971                         maximize_title += _(" (changed)");
 972                         minimize_title += char_type('*');
 973                 }
 974                 if (buf.isReadonly())
 975                         maximize_title += _(" (read only)");
 976         }
 977
 978         QString title = windowTitle();
 979         QString new_title = toqstr(maximize_title);
 980         if (title == new_title)
 981                 return;
 982
 983         QWidget::setWindowTitle(new_title);
 984         QWidget::setWindowIconText(toqstr(minimize_title));
 985         titleChanged(this);
 986 }
 987
 988
 989 void GuiWorkArea::setReadOnly(bool)
 990 {
 991         updateWindowTitle();
 992         if (this == lyx_view_->currentWorkArea())
 993                 lyx_view_->getDialogs().updateBufferDependent(false);
 994 }
 995
 996
 997 ////////////////////////////////////////////////////////////////////
 998 //
 999 // TabWorkArea
1000 //
1001 ////////////////////////////////////////////////////////////////////
1002
1003 TabWorkArea::TabWorkArea(QWidget * parent) : QTabWidget(parent)
1004 {
1005         QPalette pal = palette();
1006         pal.setColor(QPalette::Active, QPalette::Button,
1007                 pal.color(QPalette::Active, QPalette::Window));
1008         pal.setColor(QPalette::Disabled, QPalette::Button,
1009                 pal.color(QPalette::Disabled, QPalette::Window));
1010         pal.setColor(QPalette::Inactive, QPalette::Button,
1011                 pal.color(QPalette::Inactive, QPalette::Window));
1012
1013         QToolButton * closeTabButton = new QToolButton(this);
1014     closeTabButton->setPalette(pal);
1015         closeTabButton->setIcon(QIcon(":/images/closetab.png"));
1016         closeTabButton->setText("Close");
1017         closeTabButton->setAutoRaise(true);
1018         closeTabButton->setCursor(Qt::ArrowCursor);
1019         closeTabButton->setToolTip(tr("Close tab"));
1020         closeTabButton->setEnabled(true);
1021
1022         QObject::connect(this, SIGNAL(currentChanged(int)),
1023                 this, SLOT(on_currentTabChanged(int)));
1024         QObject::connect(closeTabButton, SIGNAL(clicked()),
1025                 this, SLOT(closeCurrentTab()));
1026
1027         setCornerWidget(closeTabButton);
1028 #if QT_VERSION >= 0x040200
1029         setUsesScrollButtons(true);
1030 #endif
1031 }
1032
1033
1034 void TabWorkArea::showBar(bool show)
1035 {
1036         tabBar()->setVisible(show);
1037 }
1038
1039
1040 GuiWorkArea * TabWorkArea::currentWorkArea()
1041 {
1042         if (count() == 0)
1043                 return 0;
1044
1045         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(currentWidget());
1046         BOOST_ASSERT(wa);
1047         return wa;
1048 }
1049
1050
1051 GuiWorkArea * TabWorkArea::workArea(Buffer & buffer)
1052 {
1053         for (int i = 0; i != count(); ++i) {
1054                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i));
1055                 BOOST_ASSERT(wa);
1056                 if (&wa->bufferView().buffer() == &buffer)
1057                         return wa;
1058         }
1059         return 0;
1060 }
1061
1062
1063 void TabWorkArea::closeAll()
1064 {
1065         while (count()) {
1066                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(0));
1067                 BOOST_ASSERT(wa);
1068                 removeTab(0);
1069                 delete wa;
1070         }
1071 }
1072
1073
1074 bool TabWorkArea::setCurrentWorkArea(GuiWorkArea * work_area)
1075 {
1076         BOOST_ASSERT(work_area);
1077         int index = indexOf(work_area);
1078         if (index == -1)
1079                 return false;
1080
1081         if (index == currentIndex())
1082                 // Make sure the work area is up to date.
1083                 on_currentTabChanged(index);
1084         else
1085                 // Switch to the work area.
1086                 setCurrentIndex(index);
1087         work_area->setFocus();
1088
1089         return true;
1090 }
1091
1092
1093 bool TabWorkArea::removeWorkArea(GuiWorkArea * work_area)
1094 {
1095         BOOST_ASSERT(work_area);
1096         int index = indexOf(work_area);
1097         if (index == -1)
1098                 return false;
1099
1100         work_area->setUpdatesEnabled(false);
1101         removeTab(index);
1102         delete work_area;
1103
1104         if (count()) {
1105                 // make sure the next work area is enabled.
1106                 currentWidget()->setUpdatesEnabled(true);
1107                 // Hide tabbar if there's only one tab.
1108                 showBar(count() > 1);
1109         }
1110         return true;
1111 }
1112
1113
1114 void TabWorkArea::on_currentTabChanged(int i)
1115 {
1116         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i));
1117         BOOST_ASSERT(wa);
1118         BufferView & bv = wa->bufferView();
1119         bv.updateMetrics();
1120         bv.cursor().fixIfBroken();
1121         wa->setUpdatesEnabled(true);
1122         wa->redraw();
1123         wa->setFocus();
1124         ///
1125         currentWorkAreaChanged(wa);
1126
1127         LYXERR(Debug::GUI) << "currentTabChanged " << i
1128                 << "File" << bv.buffer().absFileName() << endl;
1129 }
1130
1131
1132 void TabWorkArea::closeCurrentTab()
1133 {
1134         lyx::dispatch(FuncRequest(LFUN_BUFFER_CLOSE));
1135 }
1136
1137
1138 void TabWorkArea::updateTabText(GuiWorkArea * wa)
1139 {
1140         int const i = indexOf(wa);
1141         if (i < 0)
1142                 return;
1143         setTabText(i, wa->windowTitle());
1144 }
1145
1146 } // namespace frontend
1147 } // namespace lyx
1148
1149 #include "GuiWorkArea_moc.cpp"