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
  43 #include "frontends/Application.h"
  44 #include "frontends/FontMetrics.h"
  45 #include "frontends/WorkAreaManager.h"
  46
  47 #include <QContextMenuEvent>
  48 #include <QInputContext>
  49 #include <QHelpEvent>
  50 #include <QMainWindow>
  51 #include <QPainter>
  52 #include <QPalette>
  53 #include <QScrollBar>
  54 #include <QTabBar>
  55 #include <QTimer>
  56 #include <QToolButton>
  57 #include <QToolTip>
  58
  59 #include <boost/bind.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 namespace std;
  76 using namespace lyx::support;
  77
  78 namespace lyx {
  79
  80
  81 /// return the LyX mouse button state from Qt's
  82 static mouse_button::state q_button_state(Qt::MouseButton button)
  83 {
  84         mouse_button::state b = mouse_button::none;
  85         switch (button) {
  86                 case Qt::LeftButton:
  87                         b = mouse_button::button1;
  88                         break;
  89                 case Qt::MidButton:
  90                         b = mouse_button::button2;
  91                         break;
  92                 case Qt::RightButton:
  93                         b = mouse_button::button3;
  94                         break;
  95                 default:
  96                         break;
  97         }
  98         return b;
  99 }
 100
 101
 102 /// return the LyX mouse button state from Qt's
 103 mouse_button::state q_motion_state(Qt::MouseButtons state)
 104 {
 105         mouse_button::state b = mouse_button::none;
 106         if (state & Qt::LeftButton)
 107                 b |= mouse_button::button1;
 108         if (state & Qt::MidButton)
 109                 b |= mouse_button::button2;
 110         if (state & Qt::RightButton)
 111                 b |= mouse_button::button3;
 112         return b;
 113 }
 114
 115
 116 namespace frontend {
 117
 118 class CursorWidget {
 119 public:
 120         CursorWidget() {}
 121
 122         void draw(QPainter & painter)
 123         {
 124                 if (show_ && rect_.isValid()) {
 125                         switch (shape_) {
 126                         case L_SHAPE:
 127                                 painter.fillRect(rect_.x(), rect_.y(), CursorWidth, rect_.height(), color_);
 128                                 painter.setPen(color_);
 129                                 painter.drawLine(rect_.bottomLeft().x() + CursorWidth, rect_.bottomLeft().y(),
 130                                                                                                  rect_.bottomRight().x(), rect_.bottomLeft().y());
 131                                 break;
 132
 133                         case REVERSED_L_SHAPE:
 134                                 painter.fillRect(rect_.x() + rect_.height() / 3, rect_.y(), CursorWidth, rect_.height(), color_);
 135                                 painter.setPen(color_);
 136                                 painter.drawLine(rect_.bottomRight().x() - CursorWidth, rect_.bottomLeft().y(),
 137                                                                                                          rect_.bottomLeft().x(), rect_.bottomLeft().y());
 138                                 break;
 139
 140                         default:
 141                                 painter.fillRect(rect_, color_);
 142                                 break;
 143                         }
 144                 }
 145         }
 146
 147         void update(int x, int y, int h, CursorShape shape)
 148         {
 149                 color_ = guiApp->colorCache().get(Color_cursor);
 150                 shape_ = shape;
 151                 switch (shape) {
 152                 case L_SHAPE:
 153                         rect_ = QRect(x, y, CursorWidth + h / 3, h);
 154                         break;
 155                 case REVERSED_L_SHAPE:
 156                         rect_ = QRect(x - h / 3, y, CursorWidth + h / 3, h);
 157                         break;
 158                 default:
 159                         rect_ = QRect(x, y, CursorWidth, h);
 160                         break;
 161                 }
 162         }
 163
 164         void show(bool set_show = true) { show_ = set_show; }
 165         void hide() { show_ = false; }
 166
 167         QRect const & rect() { return rect_; }
 168
 169 private:
 170         ///
 171         CursorShape shape_;
 172         ///
 173         bool show_;
 174         ///
 175         QColor color_;
 176         ///
 177         QRect rect_;
 178 };
 179
 180
 181 // This is a 'heartbeat' generating synthetic mouse move events when the
 182 // cursor is at the top or bottom edge of the viewport. One scroll per 0.2 s
 183 SyntheticMouseEvent::SyntheticMouseEvent()
 184         : timeout(200), restart_timeout(true),
 185           x_old(-1), y_old(-1), scrollbar_value_old(-1.0)
 186 {}
 187
 188
 189
 190 GuiWorkArea::GuiWorkArea(Buffer & buffer, GuiView & lv)
 191         : buffer_view_(new BufferView(buffer)), lyx_view_(&lv),
 192           cursor_visible_(false),
 193     need_resize_(false), schedule_redraw_(false),
 194                 preedit_lines_(1)
 195 {
 196         buffer.workAreaManager().add(this);
 197         // Setup the signals
 198         connect(&cursor_timeout_, SIGNAL(timeout()),
 199                 this, SLOT(toggleCursor()));
 200
 201         int const time = QApplication::cursorFlashTime() / 2;
 202         if (time > 0) {
 203                 cursor_timeout_.setInterval(time);
 204                 cursor_timeout_.start();
 205         } else
 206                 // let's initialize this just to be safe
 207                 cursor_timeout_.setInterval(500);
 208
 209         screen_ = QPixmap(viewport()->width(), viewport()->height());
 210         cursor_ = new frontend::CursorWidget();
 211         cursor_->hide();
 212
 213         setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 214         setAcceptDrops(true);
 215         setMouseTracking(true);
 216         setMinimumSize(100, 70);
 217         updateWindowTitle();
 218
 219         viewport()->setAutoFillBackground(false);
 220         // We don't need double-buffering nor SystemBackground on
 221         // the viewport because we have our own backing pixmap.
 222         viewport()->setAttribute(Qt::WA_NoSystemBackground);
 223
 224         setFocusPolicy(Qt::WheelFocus);
 225
 226         viewport()->setCursor(Qt::IBeamCursor);
 227
 228         synthetic_mouse_event_.timeout.timeout.connect(
 229                 boost::bind(&GuiWorkArea::generateSyntheticMouseEvent,
 230                                         this));
 231
 232         // Initialize the vertical Scroll Bar
 233         QObject::connect(verticalScrollBar(), SIGNAL(valueChanged(int)),
 234                 this, SLOT(scrollTo(int)));
 235
 236         LYXERR(Debug::GUI, "viewport width: " << viewport()->width()
 237                 << "  viewport height: " << viewport()->height());
 238
 239         // Enables input methods for asian languages.
 240         // Must be set when creating custom text editing widgets.
 241         setAttribute(Qt::WA_InputMethodEnabled, true);
 242 }
 243
 244
 245
 246 GuiWorkArea::~GuiWorkArea()
 247 {
 248         buffer_view_->buffer().workAreaManager().remove(this);
 249         delete buffer_view_;
 250         delete cursor_;
 251 }
 252
 253
 254 void GuiWorkArea::close()
 255 {
 256         lyx_view_->removeWorkArea(this);
 257 }
 258
 259
 260 void GuiWorkArea::setFullScreen(bool full_screen)
 261 {
 262         buffer_view_->setFullScreen(full_screen);
 263         if (full_screen) {
 264                 setFrameStyle(QFrame::NoFrame);
 265                 if (lyxrc.full_screen_scrollbar)
 266                         setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 267         } else {
 268                 setFrameStyle(QFrame::Box);
 269                 setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
 270         }
 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         //we're not supposed to cache this value.
 297         int const time = QApplication::cursorFlashTime() / 2;
 298         if (time <= 0)
 299                 return;
 300         cursor_timeout_.setInterval(time);
 301         cursor_timeout_.start();
 302 }
 303
 304
 305 void GuiWorkArea::redraw()
 306 {
 307         if (!isVisible())
 308                 // No need to redraw in this case.
 309                 return;
 310
 311         // No need to do anything if this is the current view. The BufferView
 312         // metrics are already up to date.
 313         if (lyx_view_ != guiApp->currentView()
 314                 || lyx_view_->currentWorkArea() != this) {
 315                 // FIXME: it would be nice to optimize for the off-screen case.
 316                 buffer_view_->updateMetrics();
 317                 buffer_view_->cursor().fixIfBroken();
 318         }
 319
 320         // update cursor position, because otherwise it has to wait until
 321         // the blinking interval is over
 322         if (cursor_visible_) {
 323                 hideCursor();
 324                 showCursor();
 325         }
 326
 327         LYXERR(Debug::WORKAREA, "WorkArea::redraw screen");
 328         updateScreen();
 329         update(0, 0, viewport()->width(), viewport()->height());
 330
 331         /// \warning: scrollbar updating *must* be done after the BufferView is drawn
 332         /// because \c BufferView::updateScrollbar() is called in \c BufferView::draw().
 333         updateScrollbar();
 334         lyx_view_->updateStatusBar();
 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         // the cursor gets restarted in GuiView::restartCursor()
 346         stopBlinkingCursor();
 347
 348         theLyXFunc().setLyXView(lyx_view_);
 349         theLyXFunc().processKeySym(key, mod);
 350
 351 }
 352
 353
 354 void GuiWorkArea::dispatch(FuncRequest const & cmd0, KeyModifier mod)
 355 {
 356         // Handle drag&drop
 357         if (cmd0.action == LFUN_FILE_OPEN) {
 358                 lyx_view_->dispatch(cmd0);
 359                 return;
 360         }
 361
 362         theLyXFunc().setLyXView(lyx_view_);
 363
 364         FuncRequest cmd;
 365
 366         if (cmd0.action == LFUN_MOUSE_PRESS) {
 367                 if (mod == ShiftModifier)
 368                         cmd = FuncRequest(cmd0, "region-select");
 369                 else if (mod == ControlModifier)
 370                         cmd = FuncRequest(cmd0, "paragraph-select");
 371                 else
 372                         cmd = cmd0;
 373         }
 374         else
 375                 cmd = cmd0;
 376
 377         bool const notJustMovingTheMouse =
 378                 cmd.action != LFUN_MOUSE_MOTION || cmd.button() != mouse_button::none;
 379
 380         // In order to avoid bad surprise in the middle of an operation, we better stop
 381         // the blinking cursor.
 382         if (notJustMovingTheMouse)
 383                 stopBlinkingCursor();
 384
 385         buffer_view_->mouseEventDispatch(cmd);
 386
 387         // Skip these when selecting
 388         if (cmd.action != LFUN_MOUSE_MOTION) {
 389                 lyx_view_->updateLayoutList();
 390                 lyx_view_->updateToolbars();
 391         }
 392
 393         // GUI tweaks except with mouse motion with no button pressed.
 394         if (notJustMovingTheMouse) {
 395                 // Slight hack: this is only called currently when we
 396                 // clicked somewhere, so we force through the display
 397                 // of the new status here.
 398                 lyx_view_->clearMessage();
 399
 400                 // Show the cursor immediately after any operation
 401                 startBlinkingCursor();
 402         }
 403 }
 404
 405
 406 void GuiWorkArea::resizeBufferView()
 407 {
 408         // WARNING: Please don't put any code that will trigger a repaint here!
 409         // We are already inside a paint event.
 410         lyx_view_->setBusy(true);
 411         buffer_view_->resize(viewport()->width(), viewport()->height());
 412         updateScreen();
 413
 414         // Update scrollbars which might have changed due different
 415         // BufferView dimension. This is especially important when the
 416         // BufferView goes from zero-size to the real-size for the first time,
 417         // as the scrollbar paramters are then set for the first time.
 418         updateScrollbar();
 419
 420         lyx_view_->updateLayoutList();
 421         lyx_view_->setBusy(false);
 422         need_resize_ = false;
 423 }
 424
 425
 426 void GuiWorkArea::showCursor()
 427 {
 428         if (cursor_visible_)
 429                 return;
 430
 431         CursorShape shape = BAR_SHAPE;
 432
 433         Font const & realfont = buffer_view_->cursor().real_current_font;
 434         BufferParams const & bp = buffer_view_->buffer().params();
 435         bool const samelang = realfont.language() == bp.language;
 436         bool const isrtl = realfont.isVisibleRightToLeft();
 437
 438         if (!samelang || isrtl != bp.language->rightToLeft()) {
 439                 shape = L_SHAPE;
 440                 if (isrtl)
 441                         shape = REVERSED_L_SHAPE;
 442         }
 443
 444         // The ERT language hack needs fixing up
 445         if (realfont.language() == latex_language)
 446                 shape = BAR_SHAPE;
 447
 448         Font const font = buffer_view_->cursor().getFont();
 449         FontMetrics const & fm = theFontMetrics(font);
 450         int const asc = fm.maxAscent();
 451         int const des = fm.maxDescent();
 452         int h = asc + des;
 453         int x = 0;
 454         int y = 0;
 455         buffer_view_->cursor().getPos(x, y);
 456         y -= asc;
 457
 458         // if it doesn't touch the screen, don't try to show it
 459         if (y + h < 0 || y >= viewport()->height())
 460                 return;
 461
 462         cursor_visible_ = true;
 463         showCursor(x, y, h, shape);
 464 }
 465
 466
 467 void GuiWorkArea::hideCursor()
 468 {
 469         if (!cursor_visible_)
 470                 return;
 471
 472         cursor_visible_ = false;
 473         removeCursor();
 474 }
 475
 476
 477 void GuiWorkArea::toggleCursor()
 478 {
 479         if (cursor_visible_)
 480                 hideCursor();
 481         else
 482                 showCursor();
 483 }
 484
 485
 486 void GuiWorkArea::updateScrollbar()
 487 {
 488         ScrollbarParameters const & scroll_ = buffer_view_->scrollbarParameters();
 489
 490         verticalScrollBar()->setRange(scroll_.min, scroll_.max);
 491         verticalScrollBar()->setPageStep(scroll_.page_step);
 492         verticalScrollBar()->setSingleStep(scroll_.single_step);
 493         // Block the scrollbar signal to prevent recursive signal/slot calling.
 494         verticalScrollBar()->blockSignals(true);
 495         verticalScrollBar()->setValue(scroll_.position);
 496         verticalScrollBar()->setSliderPosition(scroll_.position);
 497         verticalScrollBar()->blockSignals(false);
 498 }
 499
 500
 501 void GuiWorkArea::scrollTo(int value)
 502 {
 503         stopBlinkingCursor();
 504         buffer_view_->scrollDocView(value);
 505
 506         if (lyxrc.cursor_follows_scrollbar) {
 507                 buffer_view_->setCursorFromScrollbar();
 508                 lyx_view_->updateLayoutList();
 509         }
 510         // Show the cursor immediately after any operation.
 511         startBlinkingCursor();
 512         QApplication::syncX();
 513 }
 514
 515
 516 bool GuiWorkArea::event(QEvent * e)
 517 {
 518         switch (e->type()) {
 519         case QEvent::ToolTip: {
 520                 QHelpEvent * helpEvent = static_cast<QHelpEvent *>(e);
 521                 if (lyxrc.use_tooltip) {
 522                         QPoint pos = helpEvent->pos();
 523                         if (pos.x() < viewport()->width()) {
 524                                 QString s = toqstr(buffer_view_->toolTip(pos.x(), pos.y()));
 525                                 QToolTip::showText(helpEvent->globalPos(), s);
 526                         }
 527                         else
 528                                 QToolTip::hideText();
 529                 }
 530                 // Don't forget to accept the event!
 531                 e->accept();
 532                 return true;
 533         }
 534
 535         case QEvent::ShortcutOverride: {
 536                 // We catch this event in order to catch the Tab or Shift+Tab key press
 537                 // which are otherwise reserved to focus switching between controls
 538                 // within a dialog.
 539                 QKeyEvent * ke = static_cast<QKeyEvent*>(e);
 540                 if ((ke->key() != Qt::Key_Tab && ke->key() != Qt::Key_Backtab)
 541                         || ke->modifiers() & Qt::ControlModifier)
 542                         return QAbstractScrollArea::event(e);
 543                 keyPressEvent(ke);
 544                 return true;
 545         }
 546
 547         default:
 548                 return QAbstractScrollArea::event(e);
 549         }
 550         return false;
 551 }
 552
 553
 554 void GuiWorkArea::contextMenuEvent(QContextMenuEvent * e)
 555 {
 556         QPoint pos = e->pos();
 557         docstring name = buffer_view_->contextMenu(pos.x(), pos.y());
 558         if (name.empty()) {
 559                 QAbstractScrollArea::contextMenuEvent(e);
 560                 return;
 561         }
 562         QMenu * menu = guiApp->menus().menu(toqstr(name));
 563         if (!menu) {
 564                 QAbstractScrollArea::contextMenuEvent(e);
 565                 return;
 566         }
 567         // Position the menu to the right.
 568         // FIXME: menu position should be different for RTL text.
 569         menu->exec(e->globalPos());
 570         e->accept();
 571 }
 572
 573
 574 void GuiWorkArea::focusInEvent(QFocusEvent * /*event*/)
 575 {
 576         lyx_view_->setCurrentWorkArea(this);
 577         // Repaint the whole screen.
 578         // Note: this is different from redraw() as only the backing pixmap
 579         // will be redrawn, which is cheap.
 580         viewport()->repaint();
 581
 582         startBlinkingCursor();
 583 }
 584
 585
 586 void GuiWorkArea::focusOutEvent(QFocusEvent * /*event*/)
 587 {
 588         stopBlinkingCursor();
 589 }
 590
 591
 592 void GuiWorkArea::mousePressEvent(QMouseEvent * e)
 593 {
 594         if (dc_event_.active && dc_event_ == *e) {
 595                 dc_event_.active = false;
 596                 FuncRequest cmd(LFUN_MOUSE_TRIPLE, e->x(), e->y(),
 597                         q_button_state(e->button()));
 598                 dispatch(cmd);
 599                 return;
 600         }
 601
 602         inputContext()->reset();
 603
 604         FuncRequest const cmd(LFUN_MOUSE_PRESS, e->x(), e->y(),
 605                 q_button_state(e->button()));
 606         dispatch(cmd, q_key_state(e->modifiers()));
 607 }
 608
 609
 610 void GuiWorkArea::mouseReleaseEvent(QMouseEvent * e)
 611 {
 612         if (synthetic_mouse_event_.timeout.running())
 613                 synthetic_mouse_event_.timeout.stop();
 614
 615         FuncRequest const cmd(LFUN_MOUSE_RELEASE, e->x(), e->y(),
 616                               q_button_state(e->button()));
 617         dispatch(cmd);
 618 }
 619
 620
 621 void GuiWorkArea::mouseMoveEvent(QMouseEvent * e)
 622 {
 623         // we kill the triple click if we move
 624         doubleClickTimeout();
 625         FuncRequest cmd(LFUN_MOUSE_MOTION, e->x(), e->y(),
 626                 q_motion_state(e->buttons()));
 627
 628         // If we're above or below the work area...
 629         if (e->y() <= 20 || e->y() >= viewport()->height() - 20) {
 630                 // Make sure only a synthetic event can cause a page scroll,
 631                 // so they come at a steady rate:
 632                 if (e->y() <= 20)
 633                         // _Force_ a scroll up:
 634                         cmd.y = -40;
 635                 else
 636                         cmd.y = viewport()->height();
 637                 // Store the event, to be handled when the timeout expires.
 638                 synthetic_mouse_event_.cmd = cmd;
 639
 640                 if (synthetic_mouse_event_.timeout.running())
 641                         // Discard the event. Note that it _may_ be handled
 642                         // when the timeout expires if
 643                         // synthetic_mouse_event_.cmd has not been overwritten.
 644                         // Ie, when the timeout expires, we handle the
 645                         // most recent event but discard all others that
 646                         // occurred after the one used to start the timeout
 647                         // in the first place.
 648                         return;
 649
 650                 synthetic_mouse_event_.restart_timeout = true;
 651                 synthetic_mouse_event_.timeout.start();
 652                 // Fall through to handle this event...
 653
 654         } else if (synthetic_mouse_event_.timeout.running()) {
 655                 // Store the event, to be possibly handled when the timeout
 656                 // expires.
 657                 // Once the timeout has expired, normal control is returned
 658                 // to mouseMoveEvent (restart_timeout = false).
 659                 // This results in a much smoother 'feel' when moving the
 660                 // mouse back into the work area.
 661                 synthetic_mouse_event_.cmd = cmd;
 662                 synthetic_mouse_event_.restart_timeout = false;
 663                 return;
 664         }
 665
 666         // Has anything changed on-screen since the last QMouseEvent
 667         // was received?
 668         double const scrollbar_value = verticalScrollBar()->value();
 669         if (e->x() == synthetic_mouse_event_.x_old
 670                 && e->y() == synthetic_mouse_event_.y_old
 671                 && scrollbar_value == synthetic_mouse_event_.scrollbar_value_old) {
 672                 // Nothing changed on-screen since the last QMouseEvent.
 673                 return;
 674         }
 675
 676         // Yes something has changed. Store the params used to check this.
 677         synthetic_mouse_event_.x_old = e->x();
 678         synthetic_mouse_event_.y_old = e->y();
 679         synthetic_mouse_event_.scrollbar_value_old = scrollbar_value;
 680
 681         // ... and dispatch the event to the LyX core.
 682         dispatch(cmd);
 683 }
 684
 685
 686 void GuiWorkArea::wheelEvent(QWheelEvent * e)
 687 {
 688         // Wheel rotation by one notch results in a delta() of 120 (see
 689         // documentation of QWheelEvent)
 690         double const lines = qApp->wheelScrollLines()
 691                 * lyxrc.mouse_wheel_speed
 692                 * e->delta() / 120.0;
 693         LYXERR(Debug::SCROLLING, "wheelScrollLines = " << qApp->wheelScrollLines()
 694                 << " delta = " << e->delta()
 695                 << " lines = " << lines);
 696         verticalScrollBar()->setValue(verticalScrollBar()->value() -
 697                 int(lines *  verticalScrollBar()->singleStep()));
 698 }
 699
 700
 701 void GuiWorkArea::generateSyntheticMouseEvent()
 702 {
 703         // Set things off to generate the _next_ 'pseudo' event.
 704         if (synthetic_mouse_event_.restart_timeout)
 705                 synthetic_mouse_event_.timeout.start();
 706
 707         // Has anything changed on-screen since the last timeout signal
 708         // was received?
 709         double const scrollbar_value = verticalScrollBar()->value();
 710         if (scrollbar_value != synthetic_mouse_event_.scrollbar_value_old) {
 711                 // Yes it has. Store the params used to check this.
 712                 synthetic_mouse_event_.scrollbar_value_old = scrollbar_value;
 713
 714                 // ... and dispatch the event to the LyX core.
 715                 dispatch(synthetic_mouse_event_.cmd);
 716         }
 717 }
 718
 719
 720 void GuiWorkArea::keyPressEvent(QKeyEvent * ev)
 721 {
 722         // do nothing if there are other events
 723         // (the auto repeated events come too fast)
 724         // \todo FIXME: remove hard coded Qt keys, process the key binding
 725 #ifdef Q_WS_X11
 726         if (XEventsQueued(QX11Info::display(), 0) > 1 && ev->isAutoRepeat()
 727                         && (Qt::Key_PageDown || Qt::Key_PageUp)) {
 728                 LYXERR(Debug::KEY, "system is busy: scroll key event ignored");
 729                 ev->ignore();
 730                 return;
 731         }
 732 #endif
 733
 734         LYXERR(Debug::KEY, " count: " << ev->count()
 735                 << " text: " << fromqstr(ev->text())
 736                 << " isAutoRepeat: " << ev->isAutoRepeat() << " key: " << ev->key());
 737
 738         KeySymbol sym;
 739         setKeySymbol(&sym, ev);
 740         processKeySym(sym, q_key_state(ev->modifiers()));
 741         ev->accept();
 742 }
 743
 744
 745 void GuiWorkArea::doubleClickTimeout()
 746 {
 747         dc_event_.active = false;
 748 }
 749
 750
 751 void GuiWorkArea::mouseDoubleClickEvent(QMouseEvent * ev)
 752 {
 753         dc_event_ = DoubleClick(ev);
 754         QTimer::singleShot(QApplication::doubleClickInterval(), this,
 755                            SLOT(doubleClickTimeout()));
 756         FuncRequest cmd(LFUN_MOUSE_DOUBLE,
 757                         ev->x(), ev->y(),
 758                         q_button_state(ev->button()));
 759         dispatch(cmd);
 760 }
 761
 762
 763 void GuiWorkArea::resizeEvent(QResizeEvent * ev)
 764 {
 765         QAbstractScrollArea::resizeEvent(ev);
 766         need_resize_ = true;
 767 }
 768
 769
 770 void GuiWorkArea::update(int x, int y, int w, int h)
 771 {
 772         viewport()->repaint(x, y, w, h);
 773 }
 774
 775
 776 void GuiWorkArea::paintEvent(QPaintEvent * ev)
 777 {
 778         QRect const rc = ev->rect();
 779         // LYXERR(Debug::PAINTING, "paintEvent begin: x: " << rc.x()
 780         //      << " y: " << rc.y() << " w: " << rc.width() << " h: " << rc.height());
 781
 782         if (need_resize_) {
 783                 screen_ = QPixmap(viewport()->width(), viewport()->height());
 784                 resizeBufferView();
 785                 hideCursor();
 786                 showCursor();
 787         }
 788
 789         QPainter pain(viewport());
 790         pain.drawPixmap(rc, screen_, rc);
 791         cursor_->draw(pain);
 792 }
 793
 794
 795 void GuiWorkArea::updateScreen()
 796 {
 797         GuiPainter pain(&screen_);
 798         buffer_view_->draw(pain);
 799 }
 800
 801
 802 void GuiWorkArea::showCursor(int x, int y, int h, CursorShape shape)
 803 {
 804         if (schedule_redraw_) {
 805                 buffer_view_->updateMetrics();
 806                 updateScreen();
 807                 viewport()->update(QRect(0, 0, viewport()->width(), viewport()->height()));
 808                 schedule_redraw_ = false;
 809                 // Show the cursor immediately after the update.
 810                 hideCursor();
 811                 toggleCursor();
 812                 return;
 813         }
 814
 815         cursor_->update(x, y, h, shape);
 816         cursor_->show();
 817         viewport()->update(cursor_->rect());
 818 }
 819
 820
 821 void GuiWorkArea::removeCursor()
 822 {
 823         cursor_->hide();
 824         //if (!qApp->focusWidget())
 825                 viewport()->update(cursor_->rect());
 826 }
 827
 828
 829 void GuiWorkArea::inputMethodEvent(QInputMethodEvent * e)
 830 {
 831         QString const & commit_string = e->commitString();
 832         docstring const & preedit_string
 833                 = qstring_to_ucs4(e->preeditString());
 834
 835         if (!commit_string.isEmpty()) {
 836
 837                 LYXERR(Debug::KEY, "preeditString: " << fromqstr(e->preeditString())
 838                         << " commitString: " << fromqstr(e->commitString()));
 839
 840                 int key = 0;
 841
 842                 // FIXME Iwami 04/01/07: we should take care also of UTF16 surrogates here.
 843                 for (int i = 0; i != commit_string.size(); ++i) {
 844                         QKeyEvent ev(QEvent::KeyPress, key, Qt::NoModifier, commit_string[i]);
 845                         keyPressEvent(&ev);
 846                 }
 847         }
 848
 849         // Hide the cursor during the kana-kanji transformation.
 850         if (preedit_string.empty())
 851                 startBlinkingCursor();
 852         else
 853                 stopBlinkingCursor();
 854
 855         // last_width : for checking if last preedit string was/wasn't empty.
 856         static bool last_width = false;
 857         if (!last_width && preedit_string.empty()) {
 858                 // if last_width is last length of preedit string.
 859                 e->accept();
 860                 return;
 861         }
 862
 863         GuiPainter pain(&screen_);
 864         buffer_view_->updateMetrics();
 865         buffer_view_->draw(pain);
 866         FontInfo font = buffer_view_->cursor().getFont().fontInfo();
 867         FontMetrics const & fm = theFontMetrics(font);
 868         int height = fm.maxHeight();
 869         int cur_x = cursor_->rect().left();
 870         int cur_y = cursor_->rect().bottom();
 871
 872         // redraw area of preedit string.
 873         update(0, cur_y - height, viewport()->width(),
 874                 (height + 1) * preedit_lines_);
 875
 876         if (preedit_string.empty()) {
 877                 last_width = false;
 878                 preedit_lines_ = 1;
 879                 e->accept();
 880                 return;
 881         }
 882         last_width = true;
 883
 884         // att : stores an IM attribute.
 885         QList<QInputMethodEvent::Attribute> const & att = e->attributes();
 886
 887         // get attributes of input method cursor.
 888         // cursor_pos : cursor position in preedit string.
 889         size_t cursor_pos = 0;
 890         bool cursor_is_visible = false;
 891         for (int i = 0; i != att.size(); ++i) {
 892                 if (att.at(i).type == QInputMethodEvent::Cursor) {
 893                         cursor_pos = att.at(i).start;
 894                         cursor_is_visible = att.at(i).length != 0;
 895                         break;
 896                 }
 897         }
 898
 899         size_t preedit_length = preedit_string.length();
 900
 901         // get position of selection in input method.
 902         // FIXME: isn't there a way to do this simplier?
 903         // rStart : cursor position in selected string in IM.
 904         size_t rStart = 0;
 905         // rLength : selected string length in IM.
 906         size_t rLength = 0;
 907         if (cursor_pos < preedit_length) {
 908                 for (int i = 0; i != att.size(); ++i) {
 909                         if (att.at(i).type == QInputMethodEvent::TextFormat) {
 910                                 if (att.at(i).start <= int(cursor_pos)
 911                                         && int(cursor_pos) < att.at(i).start + att.at(i).length) {
 912                                                 rStart = att.at(i).start;
 913                                                 rLength = att.at(i).length;
 914                                                 if (!cursor_is_visible)
 915                                                         cursor_pos += rLength;
 916                                                 break;
 917                                 }
 918                         }
 919                 }
 920         }
 921         else {
 922                 rStart = cursor_pos;
 923                 rLength = 0;
 924         }
 925
 926         int const right_margin = buffer_view_->rightMargin();
 927         Painter::preedit_style ps;
 928         // Most often there would be only one line:
 929         preedit_lines_ = 1;
 930         for (size_t pos = 0; pos != preedit_length; ++pos) {
 931                 char_type const typed_char = preedit_string[pos];
 932                 // reset preedit string style
 933                 ps = Painter::preedit_default;
 934
 935                 // if we reached the right extremity of the screen, go to next line.
 936                 if (cur_x + fm.width(typed_char) > viewport()->width() - right_margin) {
 937                         cur_x = right_margin;
 938                         cur_y += height + 1;
 939                         ++preedit_lines_;
 940                 }
 941                 // preedit strings are displayed with dashed underline
 942                 // and partial strings are displayed white on black indicating
 943                 // that we are in selecting mode in the input method.
 944                 // FIXME: rLength == preedit_length is not a changing condition
 945                 // FIXME: should be put out of the loop.
 946                 if (pos >= rStart
 947                         && pos < rStart + rLength
 948                         && !(cursor_pos < rLength && rLength == preedit_length))
 949                         ps = Painter::preedit_selecting;
 950
 951                 if (pos == cursor_pos
 952                         && (cursor_pos < rLength && rLength == preedit_length))
 953                         ps = Painter::preedit_cursor;
 954
 955                 // draw one character and update cur_x.
 956                 cur_x += pain.preeditText(cur_x, cur_y, typed_char, font, ps);
 957         }
 958
 959         // update the preedit string screen area.
 960         update(0, cur_y - preedit_lines_*height, viewport()->width(),
 961                 (height + 1) * preedit_lines_);
 962
 963         // Don't forget to accept the event!
 964         e->accept();
 965 }
 966
 967
 968 QVariant GuiWorkArea::inputMethodQuery(Qt::InputMethodQuery query) const
 969 {
 970         QRect cur_r(0,0,0,0);
 971         switch (query) {
 972                 // this is the CJK-specific composition window position.
 973                 case Qt::ImMicroFocus:
 974                         cur_r = cursor_->rect();
 975                         if (preedit_lines_ != 1)
 976                                 cur_r.moveLeft(10);
 977                         cur_r.moveBottom(cur_r.bottom() + cur_r.height() * preedit_lines_);
 978                         // return lower right of cursor in LyX.
 979                         return cur_r;
 980                 default:
 981                         return QWidget::inputMethodQuery(query);
 982         }
 983 }
 984
 985
 986 void GuiWorkArea::updateWindowTitle()
 987 {
 988         docstring maximize_title;
 989         docstring minimize_title;
 990
 991         Buffer & buf = buffer_view_->buffer();
 992         FileName const fileName = buf.fileName();
 993         if (!fileName.empty()) {
 994                 maximize_title = fileName.displayName(30);
 995                 minimize_title = from_utf8(fileName.onlyFileName());
 996                 if (!buf.isClean()) {
 997                         maximize_title += _(" (changed)");
 998                         minimize_title += char_type('*');
 999                 }
1000                 if (buf.isReadonly())
1001                         maximize_title += _(" (read only)");
1002         }
1003
1004         QString title = windowTitle();
1005         QString new_title = toqstr(maximize_title);
1006         if (title == new_title)
1007                 return;
1008
1009         QWidget::setWindowTitle(new_title);
1010         QWidget::setWindowIconText(toqstr(minimize_title));
1011         titleChanged(this);
1012 }
1013
1014
1015 void GuiWorkArea::setReadOnly(bool)
1016 {
1017         updateWindowTitle();
1018         if (this == lyx_view_->currentWorkArea())
1019                 lyx_view_->updateBufferDependent(false);
1020 }
1021
1022
1023 ////////////////////////////////////////////////////////////////////
1024 //
1025 // TabWorkArea
1026 //
1027 ////////////////////////////////////////////////////////////////////
1028
1029 TabWorkArea::TabWorkArea(QWidget * parent) : QTabWidget(parent)
1030 {
1031         QPalette pal = palette();
1032         pal.setColor(QPalette::Active, QPalette::Button,
1033                 pal.color(QPalette::Active, QPalette::Window));
1034         pal.setColor(QPalette::Disabled, QPalette::Button,
1035                 pal.color(QPalette::Disabled, QPalette::Window));
1036         pal.setColor(QPalette::Inactive, QPalette::Button,
1037                 pal.color(QPalette::Inactive, QPalette::Window));
1038
1039         QToolButton * closeTabButton = new QToolButton(this);
1040     closeTabButton->setPalette(pal);
1041         closeTabButton->setIcon(QIcon(":/images/closetab.png"));
1042         closeTabButton->setText("Close");
1043         closeTabButton->setAutoRaise(true);
1044         closeTabButton->setCursor(Qt::ArrowCursor);
1045         closeTabButton->setToolTip(tr("Close tab"));
1046         closeTabButton->setEnabled(true);
1047
1048         QObject::connect(this, SIGNAL(currentChanged(int)),
1049                 this, SLOT(on_currentTabChanged(int)));
1050         QObject::connect(closeTabButton, SIGNAL(clicked()),
1051                 this, SLOT(closeCurrentTab()));
1052
1053         setCornerWidget(closeTabButton);
1054         setUsesScrollButtons(true);
1055 }
1056
1057
1058 void TabWorkArea::setFullScreen(bool full_screen)
1059 {
1060         for (int i = 0; i != count(); ++i) {
1061                 if (GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i)))
1062                         wa->setFullScreen(full_screen);
1063         }
1064
1065         if (lyxrc.full_screen_tabbar)
1066                 showBar(!full_screen && count()>1);
1067 }
1068
1069
1070 void TabWorkArea::showBar(bool show)
1071 {
1072         tabBar()->setEnabled(show);
1073         tabBar()->setVisible(show);
1074 }
1075
1076
1077 GuiWorkArea * TabWorkArea::currentWorkArea()
1078 {
1079         if (count() == 0)
1080                 return 0;
1081
1082         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(currentWidget());
1083         BOOST_ASSERT(wa);
1084         return wa;
1085 }
1086
1087
1088 GuiWorkArea * TabWorkArea::workArea(Buffer & buffer)
1089 {
1090         for (int i = 0; i != count(); ++i) {
1091                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i));
1092                 BOOST_ASSERT(wa);
1093                 if (&wa->bufferView().buffer() == &buffer)
1094                         return wa;
1095         }
1096         return 0;
1097 }
1098
1099
1100 void TabWorkArea::closeAll()
1101 {
1102         while (count()) {
1103                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(0));
1104                 BOOST_ASSERT(wa);
1105                 removeTab(0);
1106                 delete wa;
1107         }
1108 }
1109
1110
1111 bool TabWorkArea::setCurrentWorkArea(GuiWorkArea * work_area)
1112 {
1113         BOOST_ASSERT(work_area);
1114         int index = indexOf(work_area);
1115         if (index == -1)
1116                 return false;
1117
1118         if (index == currentIndex())
1119                 // Make sure the work area is up to date.
1120                 on_currentTabChanged(index);
1121         else
1122                 // Switch to the work area.
1123                 setCurrentIndex(index);
1124         work_area->setFocus();
1125
1126         return true;
1127 }
1128
1129
1130 GuiWorkArea * TabWorkArea::addWorkArea(Buffer & buffer, GuiView & view)
1131 {
1132         GuiWorkArea * wa = new GuiWorkArea(buffer, view);
1133         wa->setUpdatesEnabled(false);
1134         // Hide tabbar if there's no tab (avoid a resize and a flashing tabbar
1135         // when hiding it again below).
1136         showBar(count() > 0);
1137         addTab(wa, wa->windowTitle());
1138         QObject::connect(wa, SIGNAL(titleChanged(GuiWorkArea *)),
1139                 this, SLOT(updateTabText(GuiWorkArea *)));
1140         // Hide tabbar if there's only one tab.
1141         showBar(count() > 1);
1142         return wa;
1143 }
1144
1145
1146 bool TabWorkArea::removeWorkArea(GuiWorkArea * work_area)
1147 {
1148         BOOST_ASSERT(work_area);
1149         int index = indexOf(work_area);
1150         if (index == -1)
1151                 return false;
1152
1153         work_area->setUpdatesEnabled(false);
1154         removeTab(index);
1155         delete work_area;
1156
1157         if (count()) {
1158                 // make sure the next work area is enabled.
1159                 currentWidget()->setUpdatesEnabled(true);
1160                 // Hide tabbar if there's only one tab.
1161                 showBar(count() > 1);
1162         }
1163         return true;
1164 }
1165
1166
1167 void TabWorkArea::on_currentTabChanged(int i)
1168 {
1169         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i));
1170         BOOST_ASSERT(wa);
1171         BufferView & bv = wa->bufferView();
1172         bv.cursor().fixIfBroken();
1173         bv.updateMetrics();
1174         wa->setUpdatesEnabled(true);
1175         wa->redraw();
1176         wa->setFocus();
1177         ///
1178         currentWorkAreaChanged(wa);
1179
1180         LYXERR(Debug::GUI, "currentTabChanged " << i
1181                 << "File" << bv.buffer().absFileName());
1182 }
1183
1184
1185 void TabWorkArea::closeCurrentTab()
1186 {
1187         lyx::dispatch(FuncRequest(LFUN_BUFFER_CLOSE));
1188 }
1189
1190
1191 void TabWorkArea::updateTabText(GuiWorkArea * wa)
1192 {
1193         int const i = indexOf(wa);
1194         if (i < 0)
1195                 return;
1196         setTabText(i, wa->windowTitle());
1197 }
1198
1199 } // namespace frontend
1200 } // namespace lyx
1201
1202 #include "GuiWorkArea_moc.cpp"