src/frontends/qt4/GuiWorkArea.cpp

   1 /**
   2  * \file GuiWorkArea.cpp
   3  * This file is part of LyX, the document processor.
   4  * Licence details can be found in the file COPYING.
   5  *
   6  * \author John Levon
   7  * \author Abdelrazak Younes
   8  *
   9  * Full author contact details are available in file CREDITS.
  10  */
  11
  12 #include <config.h>
  13
  14 #include "GuiWorkArea.h"
  15
  16 #include "Buffer.h"
  17 #include "BufferParams.h"
  18 #include "BufferView.h"
  19 #include "CoordCache.h"
  20 #include "Cursor.h"
  21 #include "Font.h"
  22 #include "FuncRequest.h"
  23 #include "GuiApplication.h"
  24 #include "GuiKeySymbol.h"
  25 #include "GuiPainter.h"
  26 #include "GuiPopupMenu.h"
  27 #include "GuiView.h"
  28 #include "KeySymbol.h"
  29 #include "Language.h"
  30 #include "LyXFunc.h"
  31 #include "LyXRC.h"
  32 #include "MetricsInfo.h"
  33 #include "qt_helpers.h"
  34 #include "version.h"
  35
  36 #include "graphics/GraphicsImage.h"
  37 #include "graphics/GraphicsLoader.h"
  38
  39 #include "support/debug.h"
  40 #include "support/gettext.h"
  41 #include "support/FileName.h"
  42 #include "support/ForkedCalls.h"
  43
  44 #include "frontends/Application.h"
  45 #include "frontends/FontMetrics.h"
  46 #include "frontends/WorkAreaManager.h"
  47
  48 #include <QContextMenuEvent>
  49 #include <QInputContext>
  50 #include <QHelpEvent>
  51 #include <QLayout>
  52 #include <QMainWindow>
  53 #include <QPainter>
  54 #include <QPalette>
  55 #include <QScrollBar>
  56 #include <QTabBar>
  57 #include <QTimer>
  58 #include <QToolButton>
  59 #include <QToolTip>
  60
  61 #include <boost/bind.hpp>
  62
  63 #ifdef Q_WS_X11
  64 #include <QX11Info>
  65 extern "C" int XEventsQueued(Display *display, int mode);
  66 #endif
  67
  68 #ifdef Q_WS_WIN
  69 int const CursorWidth = 2;
  70 #else
  71 int const CursorWidth = 1;
  72 #endif
  73
  74 #undef KeyPress
  75 #undef NoModifier
  76
  77 using namespace std;
  78 using namespace lyx::support;
  79
  80 namespace lyx {
  81
  82
  83 /// return the LyX mouse button state from Qt's
  84 static mouse_button::state q_button_state(Qt::MouseButton button)
  85 {
  86         mouse_button::state b = mouse_button::none;
  87         switch (button) {
  88                 case Qt::LeftButton:
  89                         b = mouse_button::button1;
  90                         break;
  91                 case Qt::MidButton:
  92                         b = mouse_button::button2;
  93                         break;
  94                 case Qt::RightButton:
  95                         b = mouse_button::button3;
  96                         break;
  97                 default:
  98                         break;
  99         }
 100         return b;
 101 }
 102
 103
 104 /// return the LyX mouse button state from Qt's
 105 mouse_button::state q_motion_state(Qt::MouseButtons state)
 106 {
 107         mouse_button::state b = mouse_button::none;
 108         if (state & Qt::LeftButton)
 109                 b |= mouse_button::button1;
 110         if (state & Qt::MidButton)
 111                 b |= mouse_button::button2;
 112         if (state & Qt::RightButton)
 113                 b |= mouse_button::button3;
 114         return b;
 115 }
 116
 117
 118 namespace frontend {
 119
 120 class CursorWidget {
 121 public:
 122         CursorWidget() {}
 123
 124         void draw(QPainter & painter)
 125         {
 126                 if (show_ && rect_.isValid()) {
 127                         switch (shape_) {
 128                         case L_SHAPE:
 129                                 painter.fillRect(rect_.x(), rect_.y(), CursorWidth, rect_.height(), color_);
 130                                 painter.setPen(color_);
 131                                 painter.drawLine(rect_.bottomLeft().x() + CursorWidth, rect_.bottomLeft().y(),
 132                                                                                                  rect_.bottomRight().x(), rect_.bottomLeft().y());
 133                                 break;
 134
 135                         case REVERSED_L_SHAPE:
 136                                 painter.fillRect(rect_.x() + rect_.height() / 3, rect_.y(), CursorWidth, rect_.height(), color_);
 137                                 painter.setPen(color_);
 138                                 painter.drawLine(rect_.bottomRight().x() - CursorWidth, rect_.bottomLeft().y(),
 139                                                                                                          rect_.bottomLeft().x(), rect_.bottomLeft().y());
 140                                 break;
 141
 142                         default:
 143                                 painter.fillRect(rect_, color_);
 144                                 break;
 145                         }
 146                 }
 147         }
 148
 149         void update(int x, int y, int h, CursorShape shape)
 150         {
 151                 color_ = guiApp->colorCache().get(Color_cursor);
 152                 shape_ = shape;
 153                 switch (shape) {
 154                 case L_SHAPE:
 155                         rect_ = QRect(x, y, CursorWidth + h / 3, h);
 156                         break;
 157                 case REVERSED_L_SHAPE:
 158                         rect_ = QRect(x - h / 3, y, CursorWidth + h / 3, h);
 159                         break;
 160                 default:
 161                         rect_ = QRect(x, y, CursorWidth, h);
 162                         break;
 163                 }
 164         }
 165
 166         void show(bool set_show = true) { show_ = set_show; }
 167         void hide() { show_ = false; }
 168
 169         QRect const & rect() { return rect_; }
 170
 171 private:
 172         ///
 173         CursorShape shape_;
 174         ///
 175         bool show_;
 176         ///
 177         QColor color_;
 178         ///
 179         QRect rect_;
 180 };
 181
 182
 183 // This is a 'heartbeat' generating synthetic mouse move events when the
 184 // cursor is at the top or bottom edge of the viewport. One scroll per 0.2 s
 185 SyntheticMouseEvent::SyntheticMouseEvent()
 186         : timeout(200), restart_timeout(true),
 187           x_old(-1), y_old(-1), scrollbar_value_old(-1.0)
 188 {}
 189
 190
 191
 192 GuiWorkArea::GuiWorkArea(Buffer & buffer, GuiView & lv)
 193         : buffer_view_(new BufferView(buffer)), lyx_view_(&lv),
 194           cursor_visible_(false),
 195     need_resize_(false), schedule_redraw_(false),
 196                 preedit_lines_(1)
 197 {
 198         buffer.workAreaManager().add(this);
 199         // Setup the signals
 200         cursor_timeout_.setInterval(400);
 201         connect(&cursor_timeout_, SIGNAL(timeout()),
 202                 this, SLOT(toggleCursor()));
 203
 204         cursor_timeout_.start();
 205
 206         screen_ = QPixmap(viewport()->width(), viewport()->height());
 207         cursor_ = new frontend::CursorWidget();
 208         cursor_->hide();
 209
 210         setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 211         setAcceptDrops(true);
 212         setMouseTracking(true);
 213         setMinimumSize(100, 70);
 214         updateWindowTitle();
 215
 216         viewport()->setAutoFillBackground(false);
 217         // We don't need double-buffering nor SystemBackground on
 218         // the viewport because we have our own backing pixmap.
 219         viewport()->setAttribute(Qt::WA_NoSystemBackground);
 220
 221         setFocusPolicy(Qt::WheelFocus);
 222
 223         viewport()->setCursor(Qt::IBeamCursor);
 224
 225         synthetic_mouse_event_.timeout.timeout.connect(
 226                 boost::bind(&GuiWorkArea::generateSyntheticMouseEvent,
 227                                         this));
 228
 229         // Initialize the vertical Scroll Bar
 230         QObject::connect(verticalScrollBar(), SIGNAL(valueChanged(int)),
 231                 this, SLOT(scrollTo(int)));
 232
 233         LYXERR(Debug::GUI, "viewport width: " << viewport()->width()
 234                 << "  viewport height: " << viewport()->height());
 235
 236         // Enables input methods for asian languages.
 237         // Must be set when creating custom text editing widgets.
 238         setAttribute(Qt::WA_InputMethodEnabled, true);
 239 }
 240
 241
 242
 243 GuiWorkArea::~GuiWorkArea()
 244 {
 245         buffer_view_->buffer().workAreaManager().remove(this);
 246         delete buffer_view_;
 247         delete cursor_;
 248 }
 249
 250
 251 void GuiWorkArea::close()
 252 {
 253         lyx_view_->removeWorkArea(this);
 254 }
 255
 256
 257 BufferView & GuiWorkArea::bufferView()
 258 {
 259         return *buffer_view_;
 260 }
 261
 262
 263 BufferView const & GuiWorkArea::bufferView() const
 264 {
 265         return *buffer_view_;
 266 }
 267
 268
 269 void GuiWorkArea::stopBlinkingCursor()
 270 {
 271         cursor_timeout_.stop();
 272         hideCursor();
 273 }
 274
 275
 276 void GuiWorkArea::startBlinkingCursor()
 277 {
 278         showCursor();
 279         cursor_timeout_.start();
 280 }
 281
 282
 283 void GuiWorkArea::redraw()
 284 {
 285         if (!isVisible())
 286                 // No need to redraw in this case.
 287                 return;
 288
 289         // No need to do anything if this is the current view. The BufferView
 290         // metrics are already up to date.
 291         if (lyx_view_ != guiApp->currentView()) {
 292                 // FIXME: it would be nice to optimize for the off-screen case.
 293                 buffer_view_->updateMetrics();
 294                 buffer_view_->cursor().fixIfBroken();
 295         }
 296
 297         // update cursor position, because otherwise it has to wait until
 298         // the blinking interval is over
 299         if (cursor_visible_) {
 300                 hideCursor();
 301                 showCursor();
 302         }
 303
 304         LYXERR(Debug::WORKAREA, "WorkArea::redraw screen");
 305         updateScreen();
 306         update(0, 0, viewport()->width(), viewport()->height());
 307
 308         /// \warning: scrollbar updating *must* be done after the BufferView is drawn
 309         /// because \c BufferView::updateScrollbar() is called in \c BufferView::draw().
 310         updateScrollbar();
 311         lyx_view_->updateStatusBar();
 312
 313         if (lyxerr.debugging(Debug::WORKAREA))
 314                 buffer_view_->coordCache().dump();
 315 }
 316
 317
 318 void GuiWorkArea::processKeySym(KeySymbol const & key, KeyModifier mod)
 319 {
 320         // In order to avoid bad surprise in the middle of an operation,
 321         // we better stop the blinking cursor.
 322         stopBlinkingCursor();
 323
 324         theLyXFunc().setLyXView(lyx_view_);
 325         theLyXFunc().processKeySym(key, mod);
 326 }
 327
 328
 329 void GuiWorkArea::dispatch(FuncRequest const & cmd0, KeyModifier mod)
 330 {
 331         // Handle drag&drop
 332         if (cmd0.action == LFUN_FILE_OPEN) {
 333                 lyx_view_->dispatch(cmd0);
 334                 return;
 335         }
 336
 337         theLyXFunc().setLyXView(lyx_view_);
 338
 339         FuncRequest cmd;
 340
 341         if (cmd0.action == LFUN_MOUSE_PRESS) {
 342                 if (mod == ShiftModifier)
 343                         cmd = FuncRequest(cmd0, "region-select");
 344                 else if (mod == ControlModifier)
 345                         cmd = FuncRequest(cmd0, "paragraph-select");
 346                 else
 347                         cmd = cmd0;
 348         }
 349         else
 350                 cmd = cmd0;
 351
 352         // In order to avoid bad surprise in the middle of an operation, we better stop
 353         // the blinking cursor.
 354         if (!(cmd.action == LFUN_MOUSE_MOTION
 355                 && cmd.button() == mouse_button::none))
 356                 stopBlinkingCursor();
 357
 358         buffer_view_->mouseEventDispatch(cmd);
 359
 360         // Skip these when selecting
 361         if (cmd.action != LFUN_MOUSE_MOTION) {
 362                 lyx_view_->updateLayoutList();
 363                 lyx_view_->updateToolbars();
 364         }
 365
 366         // GUI tweaks except with mouse motion with no button pressed.
 367         if (!(cmd.action == LFUN_MOUSE_MOTION
 368                 && cmd.button() == mouse_button::none)) {
 369                 // Slight hack: this is only called currently when we
 370                 // clicked somewhere, so we force through the display
 371                 // of the new status here.
 372                 lyx_view_->clearMessage();
 373
 374                 // Show the cursor immediately after any operation.
 375                 startBlinkingCursor();
 376         }
 377 }
 378
 379
 380 void GuiWorkArea::resizeBufferView()
 381 {
 382         // WARNING: Please don't put any code that will trigger a repaint here!
 383         // We are already inside a paint event.
 384         lyx_view_->setBusy(true);
 385         buffer_view_->resize(viewport()->width(), viewport()->height());
 386         lyx_view_->updateLayoutList();
 387         lyx_view_->setBusy(false);
 388         need_resize_ = false;
 389 }
 390
 391
 392 void GuiWorkArea::showCursor()
 393 {
 394         if (cursor_visible_)
 395                 return;
 396
 397         CursorShape shape = BAR_SHAPE;
 398
 399         Font const & realfont = buffer_view_->cursor().real_current_font;
 400         BufferParams const & bp = buffer_view_->buffer().params();
 401         bool const samelang = realfont.language() == bp.language;
 402         bool const isrtl = realfont.isVisibleRightToLeft();
 403
 404         if (!samelang || isrtl != bp.language->rightToLeft()) {
 405                 shape = L_SHAPE;
 406                 if (isrtl)
 407                         shape = REVERSED_L_SHAPE;
 408         }
 409
 410         // The ERT language hack needs fixing up
 411         if (realfont.language() == latex_language)
 412                 shape = BAR_SHAPE;
 413
 414         Font const font = buffer_view_->cursor().getFont();
 415         FontMetrics const & fm = theFontMetrics(font);
 416         int const asc = fm.maxAscent();
 417         int const des = fm.maxDescent();
 418         int h = asc + des;
 419         int x = 0;
 420         int y = 0;
 421         buffer_view_->cursor().getPos(x, y);
 422         y -= asc;
 423
 424         // if it doesn't touch the screen, don't try to show it
 425         if (y + h < 0 || y >= viewport()->height())
 426                 return;
 427
 428         cursor_visible_ = true;
 429         showCursor(x, y, h, shape);
 430 }
 431
 432
 433 void GuiWorkArea::hideCursor()
 434 {
 435         if (!cursor_visible_)
 436                 return;
 437
 438         cursor_visible_ = false;
 439         removeCursor();
 440 }
 441
 442
 443 void GuiWorkArea::toggleCursor()
 444 {
 445         if (cursor_visible_)
 446                 hideCursor();
 447         else
 448                 showCursor();
 449
 450         // Use this opportunity to deal with any child processes that
 451         // have finished but are waiting to communicate this fact
 452         // to the rest of LyX.
 453         ForkedCallsController::handleCompletedProcesses();
 454 }
 455
 456
 457 void GuiWorkArea::updateScrollbar()
 458 {
 459         ScrollbarParameters const & scroll_ = buffer_view_->scrollbarParameters();
 460
 461         verticalScrollBar()->setRange(scroll_.min, scroll_.max);
 462         verticalScrollBar()->setPageStep(scroll_.page_step);
 463         verticalScrollBar()->setSingleStep(scroll_.single_step);
 464         // Block the scrollbar signal to prevent recursive signal/slot calling.
 465         verticalScrollBar()->blockSignals(true);
 466         verticalScrollBar()->setValue(scroll_.position);
 467         verticalScrollBar()->setSliderPosition(scroll_.position);
 468         verticalScrollBar()->blockSignals(false);
 469 }
 470
 471
 472 void GuiWorkArea::scrollTo(int value)
 473 {
 474         stopBlinkingCursor();
 475         buffer_view_->scrollDocView(value);
 476
 477         if (lyxrc.cursor_follows_scrollbar) {
 478                 buffer_view_->setCursorFromScrollbar();
 479                 lyx_view_->updateLayoutList();
 480         }
 481         // Show the cursor immediately after any operation.
 482         startBlinkingCursor();
 483         QApplication::syncX();
 484 }
 485
 486
 487 bool GuiWorkArea::event(QEvent * e)
 488 {
 489         switch (e->type()) {
 490         case QEvent::ToolTip: {
 491                 QHelpEvent * helpEvent = static_cast<QHelpEvent *>(e);
 492                 if (lyxrc.use_tooltip) {
 493                         QPoint pos = helpEvent->pos();
 494                         if (pos.x() < viewport()->width()) {
 495                                 QString s = toqstr(buffer_view_->toolTip(pos.x(), pos.y()));
 496                                 QToolTip::showText(helpEvent->globalPos(), s);
 497                         }
 498                         else
 499                                 QToolTip::hideText();
 500                 }
 501                 // Don't forget to accept the event!
 502                 e->accept();
 503                 return true;
 504         }
 505
 506         case QEvent::ShortcutOverride: {
 507                 // We catch this event in order to catch the Tab or Shift+Tab key press
 508                 // which are otherwise reserved to focus switching between controls
 509                 // within a dialog.
 510                 QKeyEvent * ke = static_cast<QKeyEvent*>(e);
 511                 if ((ke->key() != Qt::Key_Tab && ke->key() != Qt::Key_Backtab)
 512                         || ke->modifiers() & Qt::ControlModifier)
 513                         return QAbstractScrollArea::event(e);
 514                 keyPressEvent(ke);
 515                 return true;
 516         }
 517
 518         default:
 519                 return QAbstractScrollArea::event(e);
 520         }
 521         return false;
 522 }
 523
 524
 525 void GuiWorkArea::contextMenuEvent(QContextMenuEvent * e)
 526 {
 527         QPoint pos = e->pos();
 528         docstring name = buffer_view_->contextMenu(pos.x(), pos.y());
 529         if (name.empty()) {
 530                 QAbstractScrollArea::contextMenuEvent(e);
 531                 return;
 532         }
 533         QMenu * menu = guiApp->menus().menu(toqstr(name));
 534         if (!menu) {
 535                 QAbstractScrollArea::contextMenuEvent(e);
 536                 return;
 537         }
 538         // Position the menu to the right.
 539         // FIXME: menu position should be different for RTL text.
 540         pos.rx() += menu->width();
 541         // FIXME: correct vertical position of the menu WRT screen espace.
 542         //pos.ry() += menu->height();
 543         menu->exec(pos);
 544         e->accept();
 545 }
 546
 547
 548 void GuiWorkArea::focusInEvent(QFocusEvent * /*event*/)
 549 {
 550         // Repaint the whole screen.
 551         // Note: this is different from redraw() as only the backing pixmap
 552         // will be redrawn, which is cheap.
 553         viewport()->repaint();
 554
 555         startBlinkingCursor();
 556 }
 557
 558
 559 void GuiWorkArea::focusOutEvent(QFocusEvent * /*event*/)
 560 {
 561         stopBlinkingCursor();
 562 }
 563
 564
 565 void GuiWorkArea::mousePressEvent(QMouseEvent * e)
 566 {
 567         if (dc_event_.active && dc_event_ == *e) {
 568                 dc_event_.active = false;
 569                 FuncRequest cmd(LFUN_MOUSE_TRIPLE, e->x(), e->y(),
 570                         q_button_state(e->button()));
 571                 dispatch(cmd);
 572                 return;
 573         }
 574
 575         inputContext()->reset();
 576
 577         FuncRequest const cmd(LFUN_MOUSE_PRESS, e->x(), e->y(),
 578                 q_button_state(e->button()));
 579         dispatch(cmd, q_key_state(e->modifiers()));
 580 }
 581
 582
 583 void GuiWorkArea::mouseReleaseEvent(QMouseEvent * e)
 584 {
 585         if (synthetic_mouse_event_.timeout.running())
 586                 synthetic_mouse_event_.timeout.stop();
 587
 588         FuncRequest const cmd(LFUN_MOUSE_RELEASE, e->x(), e->y(),
 589                               q_button_state(e->button()));
 590         dispatch(cmd);
 591 }
 592
 593
 594 void GuiWorkArea::mouseMoveEvent(QMouseEvent * e)
 595 {
 596         // we kill the triple click if we move
 597         doubleClickTimeout();
 598         FuncRequest cmd(LFUN_MOUSE_MOTION, e->x(), e->y(),
 599                               q_motion_state(e->buttons()));
 600
 601         // If we're above or below the work area...
 602         if (e->y() <= 20 || e->y() >= viewport()->height() - 20) {
 603                 // Make sure only a synthetic event can cause a page scroll,
 604                 // so they come at a steady rate:
 605                 if (e->y() <= 20)
 606                         // _Force_ a scroll up:
 607                         cmd.y = -40;
 608                 else
 609                         cmd.y = viewport()->height();
 610                 // Store the event, to be handled when the timeout expires.
 611                 synthetic_mouse_event_.cmd = cmd;
 612
 613                 if (synthetic_mouse_event_.timeout.running())
 614                         // Discard the event. Note that it _may_ be handled
 615                         // when the timeout expires if
 616                         // synthetic_mouse_event_.cmd has not been overwritten.
 617                         // Ie, when the timeout expires, we handle the
 618                         // most recent event but discard all others that
 619                         // occurred after the one used to start the timeout
 620                         // in the first place.
 621                         return;
 622                 else {
 623                         synthetic_mouse_event_.restart_timeout = true;
 624                         synthetic_mouse_event_.timeout.start();
 625                         // Fall through to handle this event...
 626                 }
 627
 628         } else if (synthetic_mouse_event_.timeout.running()) {
 629                 // Store the event, to be possibly handled when the timeout
 630                 // expires.
 631                 // Once the timeout has expired, normal control is returned
 632                 // to mouseMoveEvent (restart_timeout = false).
 633                 // This results in a much smoother 'feel' when moving the
 634                 // mouse back into the work area.
 635                 synthetic_mouse_event_.cmd = cmd;
 636                 synthetic_mouse_event_.restart_timeout = false;
 637                 return;
 638         }
 639
 640         // Has anything changed on-screen since the last QMouseEvent
 641         // was received?
 642         double const scrollbar_value = verticalScrollBar()->value();
 643         if (e->x() != synthetic_mouse_event_.x_old ||
 644             e->y() != synthetic_mouse_event_.y_old ||
 645             scrollbar_value != synthetic_mouse_event_.scrollbar_value_old) {
 646                 // Yes it has. Store the params used to check this.
 647                 synthetic_mouse_event_.x_old = e->x();
 648                 synthetic_mouse_event_.y_old = e->y();
 649                 synthetic_mouse_event_.scrollbar_value_old = scrollbar_value;
 650
 651                 // ... and dispatch the event to the LyX core.
 652                 dispatch(cmd);
 653         }
 654 }
 655
 656
 657 void GuiWorkArea::wheelEvent(QWheelEvent * e)
 658 {
 659         // Wheel rotation by one notch results in a delta() of 120 (see
 660         // documentation of QWheelEvent)
 661         double const lines = qApp->wheelScrollLines()
 662                 * lyxrc.mouse_wheel_speed
 663                 * e->delta() / 120.0;
 664         lyxerr << "wheelScrollLines = " << qApp->wheelScrollLines()
 665                 << " delta = " << e->delta()
 666                 << " lines = " << lines
 667                 << std::endl;
 668         verticalScrollBar()->setValue(verticalScrollBar()->value() -
 669                 int(lines *  verticalScrollBar()->singleStep()));
 670 }
 671
 672
 673 void GuiWorkArea::generateSyntheticMouseEvent()
 674 {
 675 // Set things off to generate the _next_ 'pseudo' event.
 676         if (synthetic_mouse_event_.restart_timeout)
 677                 synthetic_mouse_event_.timeout.start();
 678
 679         // Has anything changed on-screen since the last timeout signal
 680         // was received?
 681         double const scrollbar_value = verticalScrollBar()->value();
 682         if (scrollbar_value != synthetic_mouse_event_.scrollbar_value_old) {
 683                 // Yes it has. Store the params used to check this.
 684                 synthetic_mouse_event_.scrollbar_value_old = scrollbar_value;
 685
 686                 // ... and dispatch the event to the LyX core.
 687                 dispatch(synthetic_mouse_event_.cmd);
 688         }
 689 }
 690
 691
 692 void GuiWorkArea::keyPressEvent(QKeyEvent * ev)
 693 {
 694         // do nothing if there are other events
 695         // (the auto repeated events come too fast)
 696         // \todo FIXME: remove hard coded Qt keys, process the key binding
 697 #ifdef Q_WS_X11
 698         if (XEventsQueued(QX11Info::display(), 0) > 1 && ev->isAutoRepeat()
 699                         && (Qt::Key_PageDown || Qt::Key_PageUp)) {
 700                 LYXERR(Debug::KEY, "system is busy: scroll key event ignored");
 701                 ev->ignore();
 702                 return;
 703         }
 704 #endif
 705
 706         LYXERR(Debug::KEY, " count: " << ev->count()
 707                 << " text: " << fromqstr(ev->text())
 708                 << " isAutoRepeat: " << ev->isAutoRepeat() << " key: " << ev->key());
 709
 710         KeySymbol sym;
 711         setKeySymbol(&sym, ev);
 712         processKeySym(sym, q_key_state(ev->modifiers()));
 713         ev->accept();
 714 }
 715
 716
 717 void GuiWorkArea::doubleClickTimeout()
 718 {
 719         dc_event_.active = false;
 720 }
 721
 722
 723 void GuiWorkArea::mouseDoubleClickEvent(QMouseEvent * ev)
 724 {
 725         dc_event_ = DoubleClick(ev);
 726         QTimer::singleShot(QApplication::doubleClickInterval(), this,
 727                            SLOT(doubleClickTimeout()));
 728         FuncRequest cmd(LFUN_MOUSE_DOUBLE,
 729                         ev->x(), ev->y(),
 730                         q_button_state(ev->button()));
 731         dispatch(cmd);
 732 }
 733
 734
 735 void GuiWorkArea::resizeEvent(QResizeEvent * ev)
 736 {
 737         QAbstractScrollArea::resizeEvent(ev);
 738         need_resize_ = true;
 739 }
 740
 741
 742 void GuiWorkArea::update(int x, int y, int w, int h)
 743 {
 744         viewport()->repaint(x, y, w, h);
 745 }
 746
 747
 748 void GuiWorkArea::paintEvent(QPaintEvent * ev)
 749 {
 750         QRect const rc = ev->rect();
 751         // LYXERR(Debug::PAINTING, "paintEvent begin: x: " << rc.x()
 752         //      << " y: " << rc.y() << " w: " << rc.width() << " h: " << rc.height());
 753
 754         if (need_resize_) {
 755                 screen_ = QPixmap(viewport()->width(), viewport()->height());
 756                 resizeBufferView();
 757                 updateScreen();
 758                 hideCursor();
 759                 showCursor();
 760         }
 761
 762         QPainter pain(viewport());
 763         pain.drawPixmap(rc, screen_, rc);
 764         cursor_->draw(pain);
 765 }
 766
 767
 768 void GuiWorkArea::updateScreen()
 769 {
 770         GuiPainter pain(&screen_);
 771         buffer_view_->draw(pain);
 772 }
 773
 774
 775 void GuiWorkArea::showCursor(int x, int y, int h, CursorShape shape)
 776 {
 777         if (schedule_redraw_) {
 778                 buffer_view_->updateMetrics();
 779                 updateScreen();
 780                 viewport()->update(QRect(0, 0, viewport()->width(), viewport()->height()));
 781                 schedule_redraw_ = false;
 782                 // Show the cursor immediately after the update.
 783                 hideCursor();
 784                 toggleCursor();
 785                 return;
 786         }
 787
 788         cursor_->update(x, y, h, shape);
 789         cursor_->show();
 790         viewport()->update(cursor_->rect());
 791 }
 792
 793
 794 void GuiWorkArea::removeCursor()
 795 {
 796         cursor_->hide();
 797         //if (!qApp->focusWidget())
 798                 viewport()->update(cursor_->rect());
 799 }
 800
 801
 802 void GuiWorkArea::inputMethodEvent(QInputMethodEvent * e)
 803 {
 804         QString const & commit_string = e->commitString();
 805         docstring const & preedit_string
 806                 = qstring_to_ucs4(e->preeditString());
 807
 808         if (!commit_string.isEmpty()) {
 809
 810                 LYXERR(Debug::KEY, "preeditString: " << fromqstr(e->preeditString())
 811                         << " commitString: " << fromqstr(e->commitString()));
 812
 813                 int key = 0;
 814
 815                 // FIXME Iwami 04/01/07: we should take care also of UTF16 surrogates here.
 816                 for (int i = 0; i != commit_string.size(); ++i) {
 817                         QKeyEvent ev(QEvent::KeyPress, key, Qt::NoModifier, commit_string[i]);
 818                         keyPressEvent(&ev);
 819                 }
 820         }
 821
 822         // Hide the cursor during the kana-kanji transformation.
 823         if (preedit_string.empty())
 824                 startBlinkingCursor();
 825         else
 826                 stopBlinkingCursor();
 827
 828         // last_width : for checking if last preedit string was/wasn't empty.
 829         static bool last_width = false;
 830         if (!last_width && preedit_string.empty()) {
 831                 // if last_width is last length of preedit string.
 832                 e->accept();
 833                 return;
 834         }
 835
 836         GuiPainter pain(&screen_);
 837         buffer_view_->updateMetrics();
 838         buffer_view_->draw(pain);
 839         FontInfo font = buffer_view_->cursor().getFont().fontInfo();
 840         FontMetrics const & fm = theFontMetrics(font);
 841         int height = fm.maxHeight();
 842         int cur_x = cursor_->rect().left();
 843         int cur_y = cursor_->rect().bottom();
 844
 845         // redraw area of preedit string.
 846         update(0, cur_y - height, viewport()->width(),
 847                 (height + 1) * preedit_lines_);
 848
 849         if (preedit_string.empty()) {
 850                 last_width = false;
 851                 preedit_lines_ = 1;
 852                 e->accept();
 853                 return;
 854         }
 855         last_width = true;
 856
 857         // att : stores an IM attribute.
 858         QList<QInputMethodEvent::Attribute> const & att = e->attributes();
 859
 860         // get attributes of input method cursor.
 861         // cursor_pos : cursor position in preedit string.
 862         size_t cursor_pos = 0;
 863         bool cursor_is_visible = false;
 864         for (int i = 0; i != att.size(); ++i) {
 865                 if (att.at(i).type == QInputMethodEvent::Cursor) {
 866                         cursor_pos = att.at(i).start;
 867                         cursor_is_visible = att.at(i).length != 0;
 868                         break;
 869                 }
 870         }
 871
 872         size_t preedit_length = preedit_string.length();
 873
 874         // get position of selection in input method.
 875         // FIXME: isn't there a way to do this simplier?
 876         // rStart : cursor position in selected string in IM.
 877         size_t rStart = 0;
 878         // rLength : selected string length in IM.
 879         size_t rLength = 0;
 880         if (cursor_pos < preedit_length) {
 881                 for (int i = 0; i != att.size(); ++i) {
 882                         if (att.at(i).type == QInputMethodEvent::TextFormat) {
 883                                 if (att.at(i).start <= int(cursor_pos)
 884                                         && int(cursor_pos) < att.at(i).start + att.at(i).length) {
 885                                                 rStart = att.at(i).start;
 886                                                 rLength = att.at(i).length;
 887                                                 if (!cursor_is_visible)
 888                                                         cursor_pos += rLength;
 889                                                 break;
 890                                 }
 891                         }
 892                 }
 893         }
 894         else {
 895                 rStart = cursor_pos;
 896                 rLength = 0;
 897         }
 898
 899         int const right_margin = rightMargin();
 900         Painter::preedit_style ps;
 901         // Most often there would be only one line:
 902         preedit_lines_ = 1;
 903         for (size_t pos = 0; pos != preedit_length; ++pos) {
 904                 char_type const typed_char = preedit_string[pos];
 905                 // reset preedit string style
 906                 ps = Painter::preedit_default;
 907
 908                 // if we reached the right extremity of the screen, go to next line.
 909                 if (cur_x + fm.width(typed_char) > viewport()->width() - right_margin) {
 910                         cur_x = right_margin;
 911                         cur_y += height + 1;
 912                         ++preedit_lines_;
 913                 }
 914                 // preedit strings are displayed with dashed underline
 915                 // and partial strings are displayed white on black indicating
 916                 // that we are in selecting mode in the input method.
 917                 // FIXME: rLength == preedit_length is not a changing condition
 918                 // FIXME: should be put out of the loop.
 919                 if (pos >= rStart
 920                         && pos < rStart + rLength
 921                         && !(cursor_pos < rLength && rLength == preedit_length))
 922                         ps = Painter::preedit_selecting;
 923
 924                 if (pos == cursor_pos
 925                         && (cursor_pos < rLength && rLength == preedit_length))
 926                         ps = Painter::preedit_cursor;
 927
 928                 // draw one character and update cur_x.
 929                 cur_x += pain.preeditText(cur_x, cur_y, typed_char, font, ps);
 930         }
 931
 932         // update the preedit string screen area.
 933         update(0, cur_y - preedit_lines_*height, viewport()->width(),
 934                 (height + 1) * preedit_lines_);
 935
 936         // Don't forget to accept the event!
 937         e->accept();
 938 }
 939
 940
 941 QVariant GuiWorkArea::inputMethodQuery(Qt::InputMethodQuery query) const
 942 {
 943         QRect cur_r(0,0,0,0);
 944         switch (query) {
 945                 // this is the CJK-specific composition window position.
 946                 case Qt::ImMicroFocus:
 947                         cur_r = cursor_->rect();
 948                         if (preedit_lines_ != 1)
 949                                 cur_r.moveLeft(10);
 950                         cur_r.moveBottom(cur_r.bottom() + cur_r.height() * preedit_lines_);
 951                         // return lower right of cursor in LyX.
 952                         return cur_r;
 953                 default:
 954                         return QWidget::inputMethodQuery(query);
 955         }
 956 }
 957
 958
 959 void GuiWorkArea::updateWindowTitle()
 960 {
 961         docstring maximize_title;
 962         docstring minimize_title;
 963
 964         Buffer & buf = buffer_view_->buffer();
 965         FileName const fileName = buf.fileName();
 966         if (!fileName.empty()) {
 967                 maximize_title = fileName.displayName(30);
 968                 minimize_title = from_utf8(fileName.onlyFileName());
 969                 if (!buf.isClean()) {
 970                         maximize_title += _(" (changed)");
 971                         minimize_title += char_type('*');
 972                 }
 973                 if (buf.isReadonly())
 974                         maximize_title += _(" (read only)");
 975         }
 976
 977         QString title = windowTitle();
 978         QString new_title = toqstr(maximize_title);
 979         if (title == new_title)
 980                 return;
 981
 982         QWidget::setWindowTitle(new_title);
 983         QWidget::setWindowIconText(toqstr(minimize_title));
 984         titleChanged(this);
 985 }
 986
 987
 988 void GuiWorkArea::setReadOnly(bool)
 989 {
 990         updateWindowTitle();
 991         if (this == lyx_view_->currentWorkArea())
 992                 lyx_view_->updateBufferDependent(false);
 993 }
 994
 995
 996 ////////////////////////////////////////////////////////////////////
 997 //
 998 // TabWorkArea
 999 //
1000 ////////////////////////////////////////////////////////////////////
1001
1002 TabWorkArea::TabWorkArea(QWidget * parent) : QTabWidget(parent)
1003 {
1004         QPalette pal = palette();
1005         pal.setColor(QPalette::Active, QPalette::Button,
1006                 pal.color(QPalette::Active, QPalette::Window));
1007         pal.setColor(QPalette::Disabled, QPalette::Button,
1008                 pal.color(QPalette::Disabled, QPalette::Window));
1009         pal.setColor(QPalette::Inactive, QPalette::Button,
1010                 pal.color(QPalette::Inactive, QPalette::Window));
1011
1012         QToolButton * closeTabButton = new QToolButton(this);
1013     closeTabButton->setPalette(pal);
1014         closeTabButton->setIcon(QIcon(":/images/closetab.png"));
1015         closeTabButton->setText("Close");
1016         closeTabButton->setAutoRaise(true);
1017         closeTabButton->setCursor(Qt::ArrowCursor);
1018         closeTabButton->setToolTip(tr("Close tab"));
1019         closeTabButton->setEnabled(true);
1020
1021         QObject::connect(this, SIGNAL(currentChanged(int)),
1022                 this, SLOT(on_currentTabChanged(int)));
1023         QObject::connect(closeTabButton, SIGNAL(clicked()),
1024                 this, SLOT(closeCurrentTab()));
1025
1026         setCornerWidget(closeTabButton);
1027         setUsesScrollButtons(true);
1028 }
1029
1030
1031 void TabWorkArea::showBar(bool show)
1032 {
1033         tabBar()->setEnabled(show);
1034         tabBar()->setVisible(show);
1035 }
1036
1037
1038 GuiWorkArea * TabWorkArea::currentWorkArea()
1039 {
1040         if (count() == 0)
1041                 return 0;
1042
1043         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(currentWidget());
1044         BOOST_ASSERT(wa);
1045         return wa;
1046 }
1047
1048
1049 GuiWorkArea * TabWorkArea::workArea(Buffer & buffer)
1050 {
1051         for (int i = 0; i != count(); ++i) {
1052                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i));
1053                 BOOST_ASSERT(wa);
1054                 if (&wa->bufferView().buffer() == &buffer)
1055                         return wa;
1056         }
1057         return 0;
1058 }
1059
1060
1061 void TabWorkArea::closeAll()
1062 {
1063         while (count()) {
1064                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(0));
1065                 BOOST_ASSERT(wa);
1066                 removeTab(0);
1067                 delete wa;
1068         }
1069 }
1070
1071
1072 bool TabWorkArea::setCurrentWorkArea(GuiWorkArea * work_area)
1073 {
1074         BOOST_ASSERT(work_area);
1075         int index = indexOf(work_area);
1076         if (index == -1)
1077                 return false;
1078
1079         if (index == currentIndex())
1080                 // Make sure the work area is up to date.
1081                 on_currentTabChanged(index);
1082         else
1083                 // Switch to the work area.
1084                 setCurrentIndex(index);
1085         work_area->setFocus();
1086
1087         return true;
1088 }
1089
1090
1091 GuiWorkArea * TabWorkArea::addWorkArea(Buffer & buffer, GuiView & view)
1092 {
1093         GuiWorkArea * wa = new GuiWorkArea(buffer, view);
1094         wa->setUpdatesEnabled(false);
1095         // Hide tabbar if there's no tab (avoid a resize and a flashing tabbar
1096         // when hiding it again below).
1097         showBar(count() > 0);
1098         addTab(wa, wa->windowTitle());
1099         QObject::connect(wa, SIGNAL(titleChanged(GuiWorkArea *)),
1100                 this, SLOT(updateTabText(GuiWorkArea *)));
1101         // Hide tabbar if there's only one tab.
1102         showBar(count() > 1);
1103         return wa;
1104 }
1105
1106
1107 bool TabWorkArea::removeWorkArea(GuiWorkArea * work_area)
1108 {
1109         BOOST_ASSERT(work_area);
1110         int index = indexOf(work_area);
1111         if (index == -1)
1112                 return false;
1113
1114         work_area->setUpdatesEnabled(false);
1115         removeTab(index);
1116         delete work_area;
1117
1118         if (count()) {
1119                 // make sure the next work area is enabled.
1120                 currentWidget()->setUpdatesEnabled(true);
1121                 // Hide tabbar if there's only one tab.
1122                 showBar(count() > 1);
1123         }
1124         return true;
1125 }
1126
1127
1128 void TabWorkArea::on_currentTabChanged(int i)
1129 {
1130         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i));
1131         BOOST_ASSERT(wa);
1132         BufferView & bv = wa->bufferView();
1133         bv.cursor().fixIfBroken();
1134         bv.updateMetrics();
1135         wa->setUpdatesEnabled(true);
1136         wa->redraw();
1137         wa->setFocus();
1138         ///
1139         currentWorkAreaChanged(wa);
1140
1141         LYXERR(Debug::GUI, "currentTabChanged " << i
1142                 << "File" << bv.buffer().absFileName());
1143 }
1144
1145
1146 void TabWorkArea::closeCurrentTab()
1147 {
1148         lyx::dispatch(FuncRequest(LFUN_BUFFER_CLOSE));
1149 }
1150
1151
1152 void TabWorkArea::updateTabText(GuiWorkArea * wa)
1153 {
1154         int const i = indexOf(wa);
1155         if (i < 0)
1156                 return;
1157         setTabText(i, wa->windowTitle());
1158 }
1159
1160 } // namespace frontend
1161 } // namespace lyx
1162
1163 #include "GuiWorkArea_moc.cpp"