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