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(),
 128                                         CursorWidth, rect_.height(), color_);
 129                                 painter.setPen(color_);
 130                                 painter.drawLine(rect_.bottomLeft().x() + CursorWidth,
 131                                         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(),
 137                                         CursorWidth, rect_.height(), color_);
 138                                 painter.setPen(color_);
 139                                 painter.drawLine(rect_.bottomRight().x() - CursorWidth,
 140                                         rect_.bottomLeft().y(),
 141                                         rect_.bottomLeft().x(), rect_.bottomLeft().y());
 142                                 break;
 143
 144                         default:
 145                                 painter.fillRect(rect_, color_);
 146                                 break;
 147                         }
 148                 }
 149         }
 150
 151         void update(int x, int y, int h, CursorShape shape)
 152         {
 153                 color_ = guiApp->colorCache().get(Color_cursor);
 154                 shape_ = shape;
 155                 switch (shape) {
 156                 case L_SHAPE:
 157                         rect_ = QRect(x, y, CursorWidth + h / 3, h);
 158                         break;
 159                 case REVERSED_L_SHAPE:
 160                         rect_ = QRect(x - h / 3, y, CursorWidth + h / 3, h);
 161                         break;
 162                 default:
 163                         rect_ = QRect(x, y, CursorWidth, h);
 164                         break;
 165                 }
 166         }
 167
 168         void show(bool set_show = true) { show_ = set_show; }
 169         void hide() { show_ = false; }
 170
 171         QRect const & rect() { return rect_; }
 172
 173 private:
 174         ///
 175         CursorShape shape_;
 176         ///
 177         bool show_;
 178         ///
 179         QColor color_;
 180         ///
 181         QRect rect_;
 182 };
 183
 184
 185 // This is a 'heartbeat' generating synthetic mouse move events when the
 186 // cursor is at the top or bottom edge of the viewport. One scroll per 0.2 s
 187 SyntheticMouseEvent::SyntheticMouseEvent()
 188         : timeout(200), restart_timeout(true),
 189           x_old(-1), y_old(-1), scrollbar_value_old(-1.0)
 190 {}
 191
 192
 193
 194 GuiWorkArea::GuiWorkArea(Buffer & buffer, GuiView & lv)
 195         : buffer_view_(new BufferView(buffer)), lyx_view_(&lv),
 196         cursor_visible_(false),
 197         need_resize_(false), schedule_redraw_(false),
 198         preedit_lines_(1), completer_(this)
 199 {
 200         buffer.workAreaManager().add(this);
 201         // Setup the signals
 202         connect(&cursor_timeout_, SIGNAL(timeout()),
 203                 this, SLOT(toggleCursor()));
 204
 205         int const time = QApplication::cursorFlashTime() / 2;
 206         if (time > 0) {
 207                 cursor_timeout_.setInterval(time);
 208                 cursor_timeout_.start();
 209         } else
 210                 // let's initialize this just to be safe
 211                 cursor_timeout_.setInterval(500);
 212
 213         screen_ = QPixmap(viewport()->width(), viewport()->height());
 214         cursor_ = new frontend::CursorWidget();
 215         cursor_->hide();
 216
 217         setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 218         setAcceptDrops(true);
 219         setMouseTracking(true);
 220         setMinimumSize(100, 70);
 221         updateWindowTitle();
 222
 223         viewport()->setAutoFillBackground(false);
 224         // We don't need double-buffering nor SystemBackground on
 225         // the viewport because we have our own backing pixmap.
 226         viewport()->setAttribute(Qt::WA_NoSystemBackground);
 227
 228         setFocusPolicy(Qt::WheelFocus);
 229
 230         viewport()->setCursor(Qt::IBeamCursor);
 231
 232         synthetic_mouse_event_.timeout.timeout.connect(
 233                 boost::bind(&GuiWorkArea::generateSyntheticMouseEvent,
 234                                         this));
 235
 236         // Initialize the vertical Scroll Bar
 237         QObject::connect(verticalScrollBar(), SIGNAL(valueChanged(int)),
 238                 this, SLOT(scrollTo(int)));
 239
 240         LYXERR(Debug::GUI, "viewport width: " << viewport()->width()
 241                 << "  viewport height: " << viewport()->height());
 242
 243         // Enables input methods for asian languages.
 244         // Must be set when creating custom text editing widgets.
 245         setAttribute(Qt::WA_InputMethodEnabled, true);
 246 }
 247
 248
 249 GuiWorkArea::~GuiWorkArea()
 250 {
 251         buffer_view_->buffer().workAreaManager().remove(this);
 252         delete buffer_view_;
 253         delete cursor_;
 254 }
 255
 256
 257 void GuiWorkArea::close()
 258 {
 259         lyx_view_->removeWorkArea(this);
 260 }
 261
 262
 263 void GuiWorkArea::setFullScreen(bool full_screen)
 264 {
 265         buffer_view_->setFullScreen(full_screen);
 266         if (full_screen) {
 267                 setFrameStyle(QFrame::NoFrame);
 268                 if (lyxrc.full_screen_scrollbar)
 269                         setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 270         } else {
 271                 setFrameStyle(QFrame::Box);
 272                 setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
 273         }
 274 }
 275
 276
 277 BufferView & GuiWorkArea::bufferView()
 278 {
 279         return *buffer_view_;
 280 }
 281
 282
 283 BufferView const & GuiWorkArea::bufferView() const
 284 {
 285         return *buffer_view_;
 286 }
 287
 288
 289 void GuiWorkArea::stopBlinkingCursor()
 290 {
 291         cursor_timeout_.stop();
 292         hideCursor();
 293 }
 294
 295
 296 void GuiWorkArea::startBlinkingCursor()
 297 {
 298         showCursor();
 299         //we're not supposed to cache this value.
 300         int const time = QApplication::cursorFlashTime() / 2;
 301         if (time <= 0)
 302                 return;
 303         cursor_timeout_.setInterval(time);
 304         cursor_timeout_.start();
 305 }
 306
 307
 308 void GuiWorkArea::redraw()
 309 {
 310         if (!isVisible())
 311                 // No need to redraw in this case.
 312                 return;
 313
 314         // No need to do anything if this is the current view. The BufferView
 315         // metrics are already up to date.
 316         if (lyx_view_ != guiApp->currentView()
 317                 || lyx_view_->currentWorkArea() != this) {
 318                 // FIXME: it would be nice to optimize for the off-screen case.
 319                 buffer_view_->updateMetrics();
 320                 buffer_view_->cursor().fixIfBroken();
 321         }
 322
 323         // update cursor position, because otherwise it has to wait until
 324         // the blinking interval is over
 325         if (cursor_visible_) {
 326                 hideCursor();
 327                 showCursor();
 328         }
 329
 330         LYXERR(Debug::WORKAREA, "WorkArea::redraw screen");
 331         updateScreen();
 332         update(0, 0, viewport()->width(), viewport()->height());
 333
 334         /// \warning: scrollbar updating *must* be done after the BufferView is drawn
 335         /// because \c BufferView::updateScrollbar() is called in \c BufferView::draw().
 336         updateScrollbar();
 337         lyx_view_->updateStatusBar();
 338
 339         if (lyxerr.debugging(Debug::WORKAREA))
 340                 buffer_view_->coordCache().dump();
 341 }
 342
 343
 344 void GuiWorkArea::processKeySym(KeySymbol const & key, KeyModifier mod)
 345 {
 346         // In order to avoid bad surprise in the middle of an operation,
 347         // we better stop the blinking cursor...
 348         // the cursor gets restarted in GuiView::restartCursor()
 349         stopBlinkingCursor();
 350
 351         theLyXFunc().setLyXView(lyx_view_);
 352         theLyXFunc().processKeySym(key, mod);
 353
 354 }
 355
 356
 357 void GuiWorkArea::dispatch(FuncRequest const & cmd0, KeyModifier mod)
 358 {
 359         // Handle drag&drop
 360         if (cmd0.action == LFUN_FILE_OPEN) {
 361                 lyx_view_->dispatch(cmd0);
 362                 return;
 363         }
 364
 365         theLyXFunc().setLyXView(lyx_view_);
 366
 367         FuncRequest cmd;
 368
 369         if (cmd0.action == LFUN_MOUSE_PRESS) {
 370                 if (mod == ShiftModifier)
 371                         cmd = FuncRequest(cmd0, "region-select");
 372                 else if (mod == ControlModifier)
 373                         cmd = FuncRequest(cmd0, "paragraph-select");
 374                 else
 375                         cmd = cmd0;
 376         }
 377         else
 378                 cmd = cmd0;
 379
 380         bool const notJustMovingTheMouse =
 381                 cmd.action != LFUN_MOUSE_MOTION || cmd.button() != mouse_button::none;
 382
 383         // In order to avoid bad surprise in the middle of an operation, we better stop
 384         // the blinking cursor.
 385         if (notJustMovingTheMouse)
 386                 stopBlinkingCursor();
 387
 388         buffer_view_->mouseEventDispatch(cmd);
 389
 390         // Skip these when selecting
 391         if (cmd.action != LFUN_MOUSE_MOTION) {
 392                 completer_.updateVisibility(false, false);
 393                 lyx_view_->updateLayoutList();
 394                 lyx_view_->updateToolbars();
 395         }
 396
 397         // GUI tweaks except with mouse motion with no button pressed.
 398         if (notJustMovingTheMouse) {
 399                 // Slight hack: this is only called currently when we
 400                 // clicked somewhere, so we force through the display
 401                 // of the new status here.
 402                 lyx_view_->clearMessage();
 403
 404                 // Show the cursor immediately after any operation
 405                 startBlinkingCursor();
 406         }
 407 }
 408
 409
 410 void GuiWorkArea::resizeBufferView()
 411 {
 412         // WARNING: Please don't put any code that will trigger a repaint here!
 413         // We are already inside a paint event.
 414         lyx_view_->setBusy(true);
 415         buffer_view_->resize(viewport()->width(), viewport()->height());
 416         updateScreen();
 417
 418         // Update scrollbars which might have changed due different
 419         // BufferView dimension. This is especially important when the
 420         // BufferView goes from zero-size to the real-size for the first time,
 421         // as the scrollbar paramters are then set for the first time.
 422         updateScrollbar();
 423
 424         lyx_view_->updateLayoutList();
 425         lyx_view_->setBusy(false);
 426         need_resize_ = false;
 427 }
 428
 429
 430 void GuiWorkArea::showCursor()
 431 {
 432         if (cursor_visible_)
 433                 return;
 434
 435         CursorShape shape = BAR_SHAPE;
 436
 437         Font const & realfont = buffer_view_->cursor().real_current_font;
 438         BufferParams const & bp = buffer_view_->buffer().params();
 439         bool const samelang = realfont.language() == bp.language;
 440         bool const isrtl = realfont.isVisibleRightToLeft();
 441
 442         if (!samelang || isrtl != bp.language->rightToLeft()) {
 443                 shape = L_SHAPE;
 444                 if (isrtl)
 445                         shape = REVERSED_L_SHAPE;
 446         }
 447
 448         // The ERT language hack needs fixing up
 449         if (realfont.language() == latex_language)
 450                 shape = BAR_SHAPE;
 451
 452         Font const font = buffer_view_->cursor().getFont();
 453         FontMetrics const & fm = theFontMetrics(font);
 454         int const asc = fm.maxAscent();
 455         int const des = fm.maxDescent();
 456         int h = asc + des;
 457         int x = 0;
 458         int y = 0;
 459         Cursor & cur = buffer_view_->cursor();
 460         cur.getPos(x, y);
 461         y -= asc;
 462
 463         // if it doesn't touch the screen, don't try to show it
 464         bool cursorInView = true;
 465         if (y + h < 0 || y >= viewport()->height())
 466                 cursorInView = false;
 467
 468         // show cursor on screen
 469         if (cursorInView) {
 470                 cursor_visible_ = true;
 471                 showCursor(x, y, h, shape);
 472         }
 473 }
 474
 475
 476 void GuiWorkArea::hideCursor()
 477 {
 478         if (!cursor_visible_)
 479                 return;
 480
 481         cursor_visible_ = false;
 482         removeCursor();
 483 }
 484
 485
 486 void GuiWorkArea::toggleCursor()
 487 {
 488         if (cursor_visible_)
 489                 hideCursor();
 490         else
 491                 showCursor();
 492 }
 493
 494
 495 void GuiWorkArea::updateScrollbar()
 496 {
 497         ScrollbarParameters const & scroll_ = buffer_view_->scrollbarParameters();
 498
 499         verticalScrollBar()->setRange(scroll_.min, scroll_.max);
 500         verticalScrollBar()->setPageStep(scroll_.page_step);
 501         verticalScrollBar()->setSingleStep(scroll_.single_step);
 502         // Block the scrollbar signal to prevent recursive signal/slot calling.
 503         verticalScrollBar()->blockSignals(true);
 504         verticalScrollBar()->setValue(scroll_.position);
 505         verticalScrollBar()->setSliderPosition(scroll_.position);
 506         verticalScrollBar()->blockSignals(false);
 507 }
 508
 509
 510 void GuiWorkArea::scrollTo(int value)
 511 {
 512         stopBlinkingCursor();
 513         buffer_view_->scrollDocView(value);
 514
 515         if (lyxrc.cursor_follows_scrollbar) {
 516                 buffer_view_->setCursorFromScrollbar();
 517                 lyx_view_->updateLayoutList();
 518         }
 519         // Show the cursor immediately after any operation.
 520         startBlinkingCursor();
 521         QApplication::syncX();
 522 }
 523
 524
 525 bool GuiWorkArea::event(QEvent * e)
 526 {
 527         switch (e->type()) {
 528         case QEvent::ToolTip: {
 529                 QHelpEvent * helpEvent = static_cast<QHelpEvent *>(e);
 530                 if (lyxrc.use_tooltip) {
 531                         QPoint pos = helpEvent->pos();
 532                         if (pos.x() < viewport()->width()) {
 533                                 QString s = toqstr(buffer_view_->toolTip(pos.x(), pos.y()));
 534                                 QToolTip::showText(helpEvent->globalPos(), s);
 535                         }
 536                         else
 537                                 QToolTip::hideText();
 538                 }
 539                 // Don't forget to accept the event!
 540                 e->accept();
 541                 return true;
 542         }
 543
 544         case QEvent::ShortcutOverride: {
 545                 // We catch this event in order to catch the Tab or Shift+Tab key press
 546                 // which are otherwise reserved to focus switching between controls
 547                 // within a dialog.
 548                 QKeyEvent * ke = static_cast<QKeyEvent*>(e);
 549                 if ((ke->key() != Qt::Key_Tab && ke->key() != Qt::Key_Backtab)
 550                         || ke->modifiers() & Qt::ControlModifier)
 551                         return QAbstractScrollArea::event(e);
 552                 keyPressEvent(ke);
 553                 return true;
 554         }
 555
 556         default:
 557                 return QAbstractScrollArea::event(e);
 558         }
 559         return false;
 560 }
 561
 562
 563 void GuiWorkArea::contextMenuEvent(QContextMenuEvent * e)
 564 {
 565         QPoint pos = e->pos();
 566         docstring name = buffer_view_->contextMenu(pos.x(), pos.y());
 567         if (name.empty()) {
 568                 QAbstractScrollArea::contextMenuEvent(e);
 569                 return;
 570         }
 571         QMenu * menu = guiApp->menus().menu(toqstr(name));
 572         if (!menu) {
 573                 QAbstractScrollArea::contextMenuEvent(e);
 574                 return;
 575         }
 576         // Position the menu to the right.
 577         // FIXME: menu position should be different for RTL text.
 578         menu->exec(e->globalPos());
 579         e->accept();
 580 }
 581
 582
 583 void GuiWorkArea::focusInEvent(QFocusEvent * e)
 584 {
 585         lyx_view_->setCurrentWorkArea(this);
 586         // Repaint the whole screen.
 587         // Note: this is different from redraw() as only the backing pixmap
 588         // will be redrawn, which is cheap.
 589         viewport()->repaint();
 590
 591         startBlinkingCursor();
 592         QAbstractScrollArea::focusInEvent(e);
 593 }
 594
 595
 596 void GuiWorkArea::focusOutEvent(QFocusEvent * e)
 597 {
 598         stopBlinkingCursor();
 599         QAbstractScrollArea::focusOutEvent(e);
 600 }
 601
 602
 603 void GuiWorkArea::mousePressEvent(QMouseEvent * e)
 604 {
 605         if (dc_event_.active && dc_event_ == *e) {
 606                 dc_event_.active = false;
 607                 FuncRequest cmd(LFUN_MOUSE_TRIPLE, e->x(), e->y(),
 608                         q_button_state(e->button()));
 609                 dispatch(cmd);
 610                 e->accept();
 611                 return;
 612         }
 613
 614         inputContext()->reset();
 615
 616         FuncRequest const cmd(LFUN_MOUSE_PRESS, e->x(), e->y(),
 617                 q_button_state(e->button()));
 618         dispatch(cmd, q_key_state(e->modifiers()));
 619         e->accept();
 620 }
 621
 622
 623 void GuiWorkArea::mouseReleaseEvent(QMouseEvent * e)
 624 {
 625         if (synthetic_mouse_event_.timeout.running())
 626                 synthetic_mouse_event_.timeout.stop();
 627
 628         FuncRequest const cmd(LFUN_MOUSE_RELEASE, e->x(), e->y(),
 629                               q_button_state(e->button()));
 630         dispatch(cmd);
 631         e->accept();
 632 }
 633
 634
 635 void GuiWorkArea::mouseMoveEvent(QMouseEvent * e)
 636 {
 637         // we kill the triple click if we move
 638         doubleClickTimeout();
 639         FuncRequest cmd(LFUN_MOUSE_MOTION, e->x(), e->y(),
 640                 q_motion_state(e->buttons()));
 641
 642         e->accept();
 643
 644         // If we're above or below the work area...
 645         if (e->y() <= 20 || e->y() >= viewport()->height() - 20) {
 646                 // Make sure only a synthetic event can cause a page scroll,
 647                 // so they come at a steady rate:
 648                 if (e->y() <= 20)
 649                         // _Force_ a scroll up:
 650                         cmd.y = -40;
 651                 else
 652                         cmd.y = viewport()->height();
 653                 // Store the event, to be handled when the timeout expires.
 654                 synthetic_mouse_event_.cmd = cmd;
 655
 656                 if (synthetic_mouse_event_.timeout.running())
 657                         // Discard the event. Note that it _may_ be handled
 658                         // when the timeout expires if
 659                         // synthetic_mouse_event_.cmd has not been overwritten.
 660                         // Ie, when the timeout expires, we handle the
 661                         // most recent event but discard all others that
 662                         // occurred after the one used to start the timeout
 663                         // in the first place.
 664                         return;
 665
 666                 synthetic_mouse_event_.restart_timeout = true;
 667                 synthetic_mouse_event_.timeout.start();
 668                 // Fall through to handle this event...
 669
 670         } else if (synthetic_mouse_event_.timeout.running()) {
 671                 // Store the event, to be possibly handled when the timeout
 672                 // expires.
 673                 // Once the timeout has expired, normal control is returned
 674                 // to mouseMoveEvent (restart_timeout = false).
 675                 // This results in a much smoother 'feel' when moving the
 676                 // mouse back into the work area.
 677                 synthetic_mouse_event_.cmd = cmd;
 678                 synthetic_mouse_event_.restart_timeout = false;
 679                 return;
 680         }
 681
 682         // Has anything changed on-screen since the last QMouseEvent
 683         // was received?
 684         double const scrollbar_value = verticalScrollBar()->value();
 685         if (e->x() == synthetic_mouse_event_.x_old
 686                 && e->y() == synthetic_mouse_event_.y_old
 687                 && scrollbar_value == synthetic_mouse_event_.scrollbar_value_old) {
 688                 // Nothing changed on-screen since the last QMouseEvent.
 689                 return;
 690         }
 691
 692         // Yes something has changed. Store the params used to check this.
 693         synthetic_mouse_event_.x_old = e->x();
 694         synthetic_mouse_event_.y_old = e->y();
 695         synthetic_mouse_event_.scrollbar_value_old = scrollbar_value;
 696
 697         // ... and dispatch the event to the LyX core.
 698         dispatch(cmd);
 699 }
 700
 701
 702 void GuiWorkArea::wheelEvent(QWheelEvent * e)
 703 {
 704         // Wheel rotation by one notch results in a delta() of 120 (see
 705         // documentation of QWheelEvent)
 706         double const lines = qApp->wheelScrollLines()
 707                 * lyxrc.mouse_wheel_speed
 708                 * e->delta() / 120.0;
 709         LYXERR(Debug::SCROLLING, "wheelScrollLines = " << qApp->wheelScrollLines()
 710                 << " delta = " << e->delta()
 711                 << " lines = " << lines);
 712         verticalScrollBar()->setValue(verticalScrollBar()->value() -
 713                 int(lines *  verticalScrollBar()->singleStep()));
 714         e->accept();
 715 }
 716
 717
 718 void GuiWorkArea::generateSyntheticMouseEvent()
 719 {
 720         // Set things off to generate the _next_ 'pseudo' event.
 721         if (synthetic_mouse_event_.restart_timeout)
 722                 synthetic_mouse_event_.timeout.start();
 723
 724         // Has anything changed on-screen since the last timeout signal
 725         // was received?
 726         double const scrollbar_value = verticalScrollBar()->value();
 727         if (scrollbar_value != synthetic_mouse_event_.scrollbar_value_old) {
 728                 // Yes it has. Store the params used to check this.
 729                 synthetic_mouse_event_.scrollbar_value_old = scrollbar_value;
 730
 731                 // ... and dispatch the event to the LyX core.
 732                 dispatch(synthetic_mouse_event_.cmd);
 733         }
 734 }
 735
 736
 737 void GuiWorkArea::keyPressEvent(QKeyEvent * ev)
 738 {
 739         // intercept some keys if completion popup is visible
 740         if (completer_.popupVisible()) {
 741                 switch (ev->key()) {
 742                 case Qt::Key_Enter:
 743                 case Qt::Key_Return:
 744                         completer_.activate();
 745                         ev->accept();
 746                         return;
 747                 }
 748         }
 749
 750         // intercept keys for the completion
 751         if (ev->key() == Qt::Key_Tab) {
 752                 completer_.tab();
 753                 ev->accept();
 754                 return;
 755         }
 756
 757         if (completer_.popupVisible() && ev->key() == Qt::Key_Escape) {
 758                 completer_.hidePopup();
 759                 ev->accept();
 760                 return;
 761         }
 762
 763         if (completer_.inlineVisible() && ev->key() == Qt::Key_Escape) {
 764                 completer_.hideInline();
 765                 ev->accept();
 766                 return;
 767         }
 768
 769         // do nothing if there are other events
 770         // (the auto repeated events come too fast)
 771         // \todo FIXME: remove hard coded Qt keys, process the key binding
 772 #ifdef Q_WS_X11
 773         if (XEventsQueued(QX11Info::display(), 0) > 1 && ev->isAutoRepeat()
 774                         && (Qt::Key_PageDown || Qt::Key_PageUp)) {
 775                 LYXERR(Debug::KEY, "system is busy: scroll key event ignored");
 776                 ev->ignore();
 777                 return;
 778         }
 779 #endif
 780
 781         LYXERR(Debug::KEY, " count: " << ev->count()
 782                 << " text: " << fromqstr(ev->text())
 783                 << " isAutoRepeat: " << ev->isAutoRepeat() << " key: " << ev->key());
 784
 785         KeySymbol sym;
 786         setKeySymbol(&sym, ev);
 787         processKeySym(sym, q_key_state(ev->modifiers()));
 788         ev->accept();
 789 }
 790
 791
 792 void GuiWorkArea::doubleClickTimeout()
 793 {
 794         dc_event_.active = false;
 795 }
 796
 797
 798 void GuiWorkArea::mouseDoubleClickEvent(QMouseEvent * ev)
 799 {
 800         dc_event_ = DoubleClick(ev);
 801         QTimer::singleShot(QApplication::doubleClickInterval(), this,
 802                            SLOT(doubleClickTimeout()));
 803         FuncRequest cmd(LFUN_MOUSE_DOUBLE,
 804                         ev->x(), ev->y(),
 805                         q_button_state(ev->button()));
 806         dispatch(cmd);
 807         ev->accept();
 808 }
 809
 810
 811 void GuiWorkArea::resizeEvent(QResizeEvent * ev)
 812 {
 813         QAbstractScrollArea::resizeEvent(ev);
 814         need_resize_ = true;
 815         ev->accept();
 816 }
 817
 818
 819 void GuiWorkArea::update(int x, int y, int w, int h)
 820 {
 821         viewport()->repaint(x, y, w, h);
 822 }
 823
 824
 825 void GuiWorkArea::paintEvent(QPaintEvent * ev)
 826 {
 827         QRect const rc = ev->rect();
 828         // LYXERR(Debug::PAINTING, "paintEvent begin: x: " << rc.x()
 829         //      << " y: " << rc.y() << " w: " << rc.width() << " h: " << rc.height());
 830
 831         if (need_resize_) {
 832                 screen_ = QPixmap(viewport()->width(), viewport()->height());
 833                 resizeBufferView();
 834                 hideCursor();
 835                 showCursor();
 836         }
 837
 838         QPainter pain(viewport());
 839         pain.drawPixmap(rc, screen_, rc);
 840         cursor_->draw(pain);
 841         ev->accept();
 842 }
 843
 844
 845 void GuiWorkArea::updateScreen()
 846 {
 847         GuiPainter pain(&screen_);
 848         buffer_view_->draw(pain);
 849 }
 850
 851
 852 void GuiWorkArea::showCursor(int x, int y, int h, CursorShape shape)
 853 {
 854         if (schedule_redraw_) {
 855                 buffer_view_->updateMetrics();
 856                 updateScreen();
 857                 viewport()->update(QRect(0, 0, viewport()->width(), viewport()->height()));
 858                 schedule_redraw_ = false;
 859                 // Show the cursor immediately after the update.
 860                 hideCursor();
 861                 toggleCursor();
 862                 return;
 863         }
 864
 865         cursor_->update(x, y, h, shape);
 866         cursor_->show();
 867         viewport()->update(cursor_->rect());
 868 }
 869
 870
 871 void GuiWorkArea::removeCursor()
 872 {
 873         cursor_->hide();
 874         //if (!qApp->focusWidget())
 875                 viewport()->update(cursor_->rect());
 876 }
 877
 878
 879 void GuiWorkArea::inputMethodEvent(QInputMethodEvent * e)
 880 {
 881         QString const & commit_string = e->commitString();
 882         docstring const & preedit_string
 883                 = qstring_to_ucs4(e->preeditString());
 884
 885         if (!commit_string.isEmpty()) {
 886
 887                 LYXERR(Debug::KEY, "preeditString: " << fromqstr(e->preeditString())
 888                         << " commitString: " << fromqstr(e->commitString()));
 889
 890                 int key = 0;
 891
 892                 // FIXME Iwami 04/01/07: we should take care also of UTF16 surrogates here.
 893                 for (int i = 0; i != commit_string.size(); ++i) {
 894                         QKeyEvent ev(QEvent::KeyPress, key, Qt::NoModifier, commit_string[i]);
 895                         keyPressEvent(&ev);
 896                 }
 897         }
 898
 899         // Hide the cursor during the kana-kanji transformation.
 900         if (preedit_string.empty())
 901                 startBlinkingCursor();
 902         else
 903                 stopBlinkingCursor();
 904
 905         // last_width : for checking if last preedit string was/wasn't empty.
 906         static bool last_width = false;
 907         if (!last_width && preedit_string.empty()) {
 908                 // if last_width is last length of preedit string.
 909                 e->accept();
 910                 return;
 911         }
 912
 913         GuiPainter pain(&screen_);
 914         buffer_view_->updateMetrics();
 915         buffer_view_->draw(pain);
 916         FontInfo font = buffer_view_->cursor().getFont().fontInfo();
 917         FontMetrics const & fm = theFontMetrics(font);
 918         int height = fm.maxHeight();
 919         int cur_x = cursor_->rect().left();
 920         int cur_y = cursor_->rect().bottom();
 921
 922         // redraw area of preedit string.
 923         update(0, cur_y - height, viewport()->width(),
 924                 (height + 1) * preedit_lines_);
 925
 926         if (preedit_string.empty()) {
 927                 last_width = false;
 928                 preedit_lines_ = 1;
 929                 e->accept();
 930                 return;
 931         }
 932         last_width = true;
 933
 934         // att : stores an IM attribute.
 935         QList<QInputMethodEvent::Attribute> const & att = e->attributes();
 936
 937         // get attributes of input method cursor.
 938         // cursor_pos : cursor position in preedit string.
 939         size_t cursor_pos = 0;
 940         bool cursor_is_visible = false;
 941         for (int i = 0; i != att.size(); ++i) {
 942                 if (att.at(i).type == QInputMethodEvent::Cursor) {
 943                         cursor_pos = att.at(i).start;
 944                         cursor_is_visible = att.at(i).length != 0;
 945                         break;
 946                 }
 947         }
 948
 949         size_t preedit_length = preedit_string.length();
 950
 951         // get position of selection in input method.
 952         // FIXME: isn't there a way to do this simplier?
 953         // rStart : cursor position in selected string in IM.
 954         size_t rStart = 0;
 955         // rLength : selected string length in IM.
 956         size_t rLength = 0;
 957         if (cursor_pos < preedit_length) {
 958                 for (int i = 0; i != att.size(); ++i) {
 959                         if (att.at(i).type == QInputMethodEvent::TextFormat) {
 960                                 if (att.at(i).start <= int(cursor_pos)
 961                                         && int(cursor_pos) < att.at(i).start + att.at(i).length) {
 962                                                 rStart = att.at(i).start;
 963                                                 rLength = att.at(i).length;
 964                                                 if (!cursor_is_visible)
 965                                                         cursor_pos += rLength;
 966                                                 break;
 967                                 }
 968                         }
 969                 }
 970         }
 971         else {
 972                 rStart = cursor_pos;
 973                 rLength = 0;
 974         }
 975
 976         int const right_margin = buffer_view_->rightMargin();
 977         Painter::preedit_style ps;
 978         // Most often there would be only one line:
 979         preedit_lines_ = 1;
 980         for (size_t pos = 0; pos != preedit_length; ++pos) {
 981                 char_type const typed_char = preedit_string[pos];
 982                 // reset preedit string style
 983                 ps = Painter::preedit_default;
 984
 985                 // if we reached the right extremity of the screen, go to next line.
 986                 if (cur_x + fm.width(typed_char) > viewport()->width() - right_margin) {
 987                         cur_x = right_margin;
 988                         cur_y += height + 1;
 989                         ++preedit_lines_;
 990                 }
 991                 // preedit strings are displayed with dashed underline
 992                 // and partial strings are displayed white on black indicating
 993                 // that we are in selecting mode in the input method.
 994                 // FIXME: rLength == preedit_length is not a changing condition
 995                 // FIXME: should be put out of the loop.
 996                 if (pos >= rStart
 997                         && pos < rStart + rLength
 998                         && !(cursor_pos < rLength && rLength == preedit_length))
 999                         ps = Painter::preedit_selecting;
1000
1001                 if (pos == cursor_pos
1002                         && (cursor_pos < rLength && rLength == preedit_length))
1003                         ps = Painter::preedit_cursor;
1004
1005                 // draw one character and update cur_x.
1006                 cur_x += pain.preeditText(cur_x, cur_y, typed_char, font, ps);
1007         }
1008
1009         // update the preedit string screen area.
1010         update(0, cur_y - preedit_lines_*height, viewport()->width(),
1011                 (height + 1) * preedit_lines_);
1012
1013         // Don't forget to accept the event!
1014         e->accept();
1015 }
1016
1017
1018 QVariant GuiWorkArea::inputMethodQuery(Qt::InputMethodQuery query) const
1019 {
1020         QRect cur_r(0,0,0,0);
1021         switch (query) {
1022                 // this is the CJK-specific composition window position.
1023                 case Qt::ImMicroFocus:
1024                         cur_r = cursor_->rect();
1025                         if (preedit_lines_ != 1)
1026                                 cur_r.moveLeft(10);
1027                         cur_r.moveBottom(cur_r.bottom() + cur_r.height() * preedit_lines_);
1028                         // return lower right of cursor in LyX.
1029                         return cur_r;
1030                 default:
1031                         return QWidget::inputMethodQuery(query);
1032         }
1033 }
1034
1035
1036 void GuiWorkArea::updateWindowTitle()
1037 {
1038         docstring maximize_title;
1039         docstring minimize_title;
1040
1041         Buffer & buf = buffer_view_->buffer();
1042         FileName const fileName = buf.fileName();
1043         if (!fileName.empty()) {
1044                 maximize_title = fileName.displayName(30);
1045                 minimize_title = from_utf8(fileName.onlyFileName());
1046                 if (!buf.isClean()) {
1047                         maximize_title += _(" (changed)");
1048                         minimize_title += char_type('*');
1049                 }
1050                 if (buf.isReadonly())
1051                         maximize_title += _(" (read only)");
1052         }
1053
1054         QString title = windowTitle();
1055         QString new_title = toqstr(maximize_title);
1056         if (title == new_title)
1057                 return;
1058
1059         QWidget::setWindowTitle(new_title);
1060         QWidget::setWindowIconText(toqstr(minimize_title));
1061         titleChanged(this);
1062 }
1063
1064
1065 void GuiWorkArea::setReadOnly(bool)
1066 {
1067         updateWindowTitle();
1068         if (this == lyx_view_->currentWorkArea())
1069                 lyx_view_->updateBufferDependent(false);
1070 }
1071
1072
1073 bool GuiWorkArea::isFullScreen()
1074 {
1075         return lyx_view_ && lyx_view_->isFullScreen();
1076 }
1077
1078
1079 ////////////////////////////////////////////////////////////////////
1080 //
1081 // TabWorkArea
1082 //
1083 ////////////////////////////////////////////////////////////////////
1084
1085 TabWorkArea::TabWorkArea(QWidget * parent) : QTabWidget(parent)
1086 {
1087         QPalette pal = palette();
1088         pal.setColor(QPalette::Active, QPalette::Button,
1089                 pal.color(QPalette::Active, QPalette::Window));
1090         pal.setColor(QPalette::Disabled, QPalette::Button,
1091                 pal.color(QPalette::Disabled, QPalette::Window));
1092         pal.setColor(QPalette::Inactive, QPalette::Button,
1093                 pal.color(QPalette::Inactive, QPalette::Window));
1094
1095         QObject::connect(this, SIGNAL(currentChanged(int)),
1096                 this, SLOT(on_currentTabChanged(int)));
1097
1098         QToolButton * closeBufferButton = new QToolButton(this);
1099     closeBufferButton->setPalette(pal);
1100         // FIXME: rename the icon to closebuffer.png
1101         closeBufferButton->setIcon(QIcon(":/images/closetab.png"));
1102         closeBufferButton->setText("Close File");
1103         closeBufferButton->setAutoRaise(true);
1104         closeBufferButton->setCursor(Qt::ArrowCursor);
1105         closeBufferButton->setToolTip(qt_("Close File"));
1106         closeBufferButton->setEnabled(true);
1107         QObject::connect(closeBufferButton, SIGNAL(clicked()),
1108                 this, SLOT(closeCurrentBuffer()));
1109         setCornerWidget(closeBufferButton, Qt::TopRightCorner);
1110
1111         QToolButton * closeTabButton = new QToolButton(this);
1112     closeTabButton->setPalette(pal);
1113         closeTabButton->setIcon(QIcon(":/images/hidetab.png"));
1114         closeTabButton->setText("Hide tab");
1115         closeTabButton->setAutoRaise(true);
1116         closeTabButton->setCursor(Qt::ArrowCursor);
1117         closeTabButton->setToolTip(qt_("Hide tab"));
1118         closeTabButton->setEnabled(true);
1119         QObject::connect(closeTabButton, SIGNAL(clicked()),
1120                 this, SLOT(closeCurrentTab()));
1121         setCornerWidget(closeTabButton, Qt::TopLeftCorner);
1122
1123         setUsesScrollButtons(true);
1124 }
1125
1126
1127 void TabWorkArea::setFullScreen(bool full_screen)
1128 {
1129         for (int i = 0; i != count(); ++i) {
1130                 if (GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i)))
1131                         wa->setFullScreen(full_screen);
1132         }
1133
1134         if (lyxrc.full_screen_tabbar)
1135                 showBar(!full_screen && count()>1);
1136 }
1137
1138
1139 void TabWorkArea::showBar(bool show)
1140 {
1141         tabBar()->setEnabled(show);
1142         tabBar()->setVisible(show);
1143 }
1144
1145
1146 GuiWorkArea * TabWorkArea::currentWorkArea()
1147 {
1148         if (count() == 0)
1149                 return 0;
1150
1151         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(currentWidget());
1152         BOOST_ASSERT(wa);
1153         return wa;
1154 }
1155
1156
1157 GuiWorkArea * TabWorkArea::workArea(Buffer & buffer)
1158 {
1159         for (int i = 0; i != count(); ++i) {
1160                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i));
1161                 BOOST_ASSERT(wa);
1162                 if (&wa->bufferView().buffer() == &buffer)
1163                         return wa;
1164         }
1165         return 0;
1166 }
1167
1168
1169 void TabWorkArea::closeAll()
1170 {
1171         while (count()) {
1172                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(0));
1173                 BOOST_ASSERT(wa);
1174                 removeTab(0);
1175                 delete wa;
1176         }
1177 }
1178
1179
1180 bool TabWorkArea::setCurrentWorkArea(GuiWorkArea * work_area)
1181 {
1182         BOOST_ASSERT(work_area);
1183         int index = indexOf(work_area);
1184         if (index == -1)
1185                 return false;
1186
1187         if (index == currentIndex())
1188                 // Make sure the work area is up to date.
1189                 on_currentTabChanged(index);
1190         else
1191                 // Switch to the work area.
1192                 setCurrentIndex(index);
1193         work_area->setFocus();
1194
1195         return true;
1196 }
1197
1198
1199 GuiWorkArea * TabWorkArea::addWorkArea(Buffer & buffer, GuiView & view)
1200 {
1201         GuiWorkArea * wa = new GuiWorkArea(buffer, view);
1202         wa->setUpdatesEnabled(false);
1203         // Hide tabbar if there's no tab (avoid a resize and a flashing tabbar
1204         // when hiding it again below).
1205         if (!(currentWorkArea() && currentWorkArea()->isFullScreen()))
1206                 showBar(count() > 0);
1207         addTab(wa, wa->windowTitle());
1208         QObject::connect(wa, SIGNAL(titleChanged(GuiWorkArea *)),
1209                 this, SLOT(updateTabText(GuiWorkArea *)));
1210         if (currentWorkArea() && currentWorkArea()->isFullScreen())
1211                 setFullScreen(true);
1212         else
1213                 // Hide tabbar if there's only one tab.
1214                 showBar(count() > 1);
1215
1216         return wa;
1217 }
1218
1219
1220 bool TabWorkArea::removeWorkArea(GuiWorkArea * work_area)
1221 {
1222         BOOST_ASSERT(work_area);
1223         int index = indexOf(work_area);
1224         if (index == -1)
1225                 return false;
1226
1227         work_area->setUpdatesEnabled(false);
1228         removeTab(index);
1229         delete work_area;
1230
1231         if (count()) {
1232                 // make sure the next work area is enabled.
1233                 currentWidget()->setUpdatesEnabled(true);
1234                 if ((currentWorkArea() && currentWorkArea()->isFullScreen()))
1235                         setFullScreen(true);
1236                 else
1237                         // Hide tabbar if there's only one tab.
1238                         showBar(count() > 1);
1239         }
1240         return true;
1241 }
1242
1243
1244 void TabWorkArea::on_currentTabChanged(int i)
1245 {
1246         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i));
1247         BOOST_ASSERT(wa);
1248         BufferView & bv = wa->bufferView();
1249         bv.cursor().fixIfBroken();
1250         bv.updateMetrics();
1251         wa->setUpdatesEnabled(true);
1252         wa->redraw();
1253         wa->setFocus();
1254         ///
1255         currentWorkAreaChanged(wa);
1256
1257         LYXERR(Debug::GUI, "currentTabChanged " << i
1258                 << "File" << bv.buffer().absFileName());
1259 }
1260
1261
1262 void TabWorkArea::closeCurrentBuffer()
1263 {
1264         lyx::dispatch(FuncRequest(LFUN_BUFFER_CLOSE));
1265 }
1266
1267
1268 void TabWorkArea::closeCurrentTab()
1269 {
1270         removeWorkArea(currentWorkArea());
1271 }
1272
1273
1274 void TabWorkArea::updateTabText(GuiWorkArea * wa)
1275 {
1276         int const i = indexOf(wa);
1277         if (i < 0)
1278                 return;
1279         setTabText(i, wa->windowTitle());
1280 }
1281
1282 } // namespace frontend
1283 } // namespace lyx
1284
1285 #include "GuiWorkArea_moc.cpp"