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