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 int const TabIndicatorWidth = 4;
  72
  73 #undef KeyPress
  74 #undef NoModifier
  75
  76 using namespace std;
  77 using namespace lyx::support;
  78
  79 namespace lyx {
  80
  81
  82 /// return the LyX mouse button state from Qt's
  83 static mouse_button::state q_button_state(Qt::MouseButton button)
  84 {
  85         mouse_button::state b = mouse_button::none;
  86         switch (button) {
  87                 case Qt::LeftButton:
  88                         b = mouse_button::button1;
  89                         break;
  90                 case Qt::MidButton:
  91                         b = mouse_button::button2;
  92                         break;
  93                 case Qt::RightButton:
  94                         b = mouse_button::button3;
  95                         break;
  96                 default:
  97                         break;
  98         }
  99         return b;
 100 }
 101
 102
 103 /// return the LyX mouse button state from Qt's
 104 mouse_button::state q_motion_state(Qt::MouseButtons state)
 105 {
 106         mouse_button::state b = mouse_button::none;
 107         if (state & Qt::LeftButton)
 108                 b |= mouse_button::button1;
 109         if (state & Qt::MidButton)
 110                 b |= mouse_button::button2;
 111         if (state & Qt::RightButton)
 112                 b |= mouse_button::button3;
 113         return b;
 114 }
 115
 116
 117 namespace frontend {
 118
 119 class CursorWidget {
 120 public:
 121         CursorWidget() {}
 122
 123         void draw(QPainter & painter)
 124         {
 125                 if (!show_ || !rect_.isValid())
 126                         return;
 127
 128                 int l = x_ - rect_.left();
 129                 int r = rect_.right() - x_;
 130                 int h = rect_.height();
 131
 132                 painter.fillRect(x_, y_, CursorWidth, h, color_);
 133                 painter.setPen(color_);
 134                 if (l_shape_) {
 135                         if (rtl_)
 136                                 painter.drawLine(x_, y_ + h, x_ - l, y_ + h);
 137                         else
 138                                 painter.drawLine(x_ + CursorWidth, y_ + h,
 139                                         x_ + CursorWidth + r, y_ + h);
 140                 }
 141
 142                 if (completable_) {
 143                         int m = y_ + h / 2;
 144                         int d = TabIndicatorWidth - 1;
 145                         if (rtl_) {
 146                                 painter.drawLine(x_ - 1 , m - d, x_ - d - 1, m);
 147                                 painter.drawLine(x_ - 1 , m + d, x_ - d - 1, m);
 148                         } else {
 149                                 painter.drawLine(x_ + CursorWidth , m - d, x_ + d + CursorWidth, m);
 150                                 painter.drawLine(x_ + CursorWidth , m + d, x_ + d + CursorWidth, m);
 151                         }
 152                 }
 153         }
 154
 155         void update(int x, int y, int h, bool l_shape,
 156                 bool rtl, bool completable)
 157         {
 158                 color_ = guiApp->colorCache().get(Color_cursor);
 159                 l_shape_ = l_shape;
 160                 rtl_ = rtl;
 161                 completable_ = completable;
 162                 x_ = x;
 163                 y_ = y;
 164                 int l = 0;
 165                 int r = 0;
 166
 167                 if (l_shape_) {
 168                         if (rtl)
 169                                 l += h / 3;
 170                         else
 171                                 r += h / 3;
 172                 }
 173
 174                 if (completable_) {
 175                         if (rtl)
 176                                 l = max(r, TabIndicatorWidth);
 177                         else
 178                                 r = max(l, TabIndicatorWidth);
 179                 }
 180
 181                 rect_ = QRect(x - l, y, CursorWidth + r + l, h);
 182         }
 183
 184         void show(bool set_show = true) { show_ = set_show; }
 185         void hide() { show_ = false; }
 186
 187         QRect const & rect() { return rect_; }
 188
 189 private:
 190         ///
 191         bool rtl_;
 192         ///
 193         bool l_shape_;
 194         ///
 195         bool completable_;
 196         ///
 197         bool show_;
 198         ///
 199         QColor color_;
 200         ///
 201         QRect rect_;
 202         ///
 203         int x_;
 204         ///
 205         int y_;
 206 };
 207
 208
 209 // This is a 'heartbeat' generating synthetic mouse move events when the
 210 // cursor is at the top or bottom edge of the viewport. One scroll per 0.2 s
 211 SyntheticMouseEvent::SyntheticMouseEvent()
 212         : timeout(200), restart_timeout(true),
 213           x_old(-1), y_old(-1), scrollbar_value_old(-1.0)
 214 {}
 215
 216
 217
 218 GuiWorkArea::GuiWorkArea(Buffer & buffer, GuiView & lv)
 219         : buffer_view_(new BufferView(buffer)), lyx_view_(&lv),
 220         cursor_visible_(false),
 221         need_resize_(false), schedule_redraw_(false),
 222         preedit_lines_(1), completer_(this)
 223 {
 224         buffer.workAreaManager().add(this);
 225         // Setup the signals
 226         connect(&cursor_timeout_, SIGNAL(timeout()),
 227                 this, SLOT(toggleCursor()));
 228
 229         int const time = QApplication::cursorFlashTime() / 2;
 230         if (time > 0) {
 231                 cursor_timeout_.setInterval(time);
 232                 cursor_timeout_.start();
 233         } else
 234                 // let's initialize this just to be safe
 235                 cursor_timeout_.setInterval(500);
 236
 237         screen_ = QPixmap(viewport()->width(), viewport()->height());
 238         cursor_ = new frontend::CursorWidget();
 239         cursor_->hide();
 240
 241         setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 242         setAcceptDrops(true);
 243         setMouseTracking(true);
 244         setMinimumSize(100, 70);
 245         updateWindowTitle();
 246
 247         viewport()->setAutoFillBackground(false);
 248         // We don't need double-buffering nor SystemBackground on
 249         // the viewport because we have our own backing pixmap.
 250         viewport()->setAttribute(Qt::WA_NoSystemBackground);
 251
 252         setFocusPolicy(Qt::WheelFocus);
 253
 254         viewport()->setCursor(Qt::IBeamCursor);
 255
 256         synthetic_mouse_event_.timeout.timeout.connect(
 257                 boost::bind(&GuiWorkArea::generateSyntheticMouseEvent,
 258                                         this));
 259
 260         // Initialize the vertical Scroll Bar
 261         QObject::connect(verticalScrollBar(), SIGNAL(valueChanged(int)),
 262                 this, SLOT(scrollTo(int)));
 263
 264         LYXERR(Debug::GUI, "viewport width: " << viewport()->width()
 265                 << "  viewport height: " << viewport()->height());
 266
 267         // Enables input methods for asian languages.
 268         // Must be set when creating custom text editing widgets.
 269         setAttribute(Qt::WA_InputMethodEnabled, true);
 270 }
 271
 272
 273 GuiWorkArea::~GuiWorkArea()
 274 {
 275         buffer_view_->buffer().workAreaManager().remove(this);
 276         delete buffer_view_;
 277         delete cursor_;
 278 }
 279
 280
 281 void GuiWorkArea::close()
 282 {
 283         lyx_view_->removeWorkArea(this);
 284 }
 285
 286
 287 void GuiWorkArea::setFullScreen(bool full_screen)
 288 {
 289         buffer_view_->setFullScreen(full_screen);
 290         if (full_screen) {
 291                 setFrameStyle(QFrame::NoFrame);
 292                 if (lyxrc.full_screen_scrollbar)
 293                         setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 294         } else {
 295                 setFrameStyle(QFrame::Box);
 296                 setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
 297         }
 298 }
 299
 300
 301 BufferView & GuiWorkArea::bufferView()
 302 {
 303         return *buffer_view_;
 304 }
 305
 306
 307 BufferView const & GuiWorkArea::bufferView() const
 308 {
 309         return *buffer_view_;
 310 }
 311
 312
 313 void GuiWorkArea::stopBlinkingCursor()
 314 {
 315         cursor_timeout_.stop();
 316         hideCursor();
 317 }
 318
 319
 320 void GuiWorkArea::startBlinkingCursor()
 321 {
 322         showCursor();
 323         //we're not supposed to cache this value.
 324         int const time = QApplication::cursorFlashTime() / 2;
 325         if (time <= 0)
 326                 return;
 327         cursor_timeout_.setInterval(time);
 328         cursor_timeout_.start();
 329 }
 330
 331
 332 void GuiWorkArea::redraw()
 333 {
 334         if (!isVisible())
 335                 // No need to redraw in this case.
 336                 return;
 337
 338         // No need to do anything if this is the current view. The BufferView
 339         // metrics are already up to date.
 340         if (lyx_view_ != guiApp->currentView()
 341                 || lyx_view_->currentWorkArea() != this) {
 342                 // FIXME: it would be nice to optimize for the off-screen case.
 343                 buffer_view_->updateMetrics();
 344                 buffer_view_->cursor().fixIfBroken();
 345         }
 346
 347         // update cursor position, because otherwise it has to wait until
 348         // the blinking interval is over
 349         if (cursor_visible_) {
 350                 hideCursor();
 351                 showCursor();
 352         }
 353
 354         LYXERR(Debug::WORKAREA, "WorkArea::redraw screen");
 355         updateScreen();
 356         update(0, 0, viewport()->width(), viewport()->height());
 357
 358         /// \warning: scrollbar updating *must* be done after the BufferView is drawn
 359         /// because \c BufferView::updateScrollbar() is called in \c BufferView::draw().
 360         updateScrollbar();
 361         lyx_view_->updateStatusBar();
 362
 363         if (lyxerr.debugging(Debug::WORKAREA))
 364                 buffer_view_->coordCache().dump();
 365 }
 366
 367
 368 void GuiWorkArea::processKeySym(KeySymbol const & key, KeyModifier mod)
 369 {
 370         // In order to avoid bad surprise in the middle of an operation,
 371         // we better stop the blinking cursor...
 372         // the cursor gets restarted in GuiView::restartCursor()
 373         stopBlinkingCursor();
 374
 375         theLyXFunc().setLyXView(lyx_view_);
 376         theLyXFunc().processKeySym(key, mod);
 377
 378 }
 379
 380
 381 void GuiWorkArea::dispatch(FuncRequest const & cmd0, KeyModifier mod)
 382 {
 383         // Handle drag&drop
 384         if (cmd0.action == LFUN_FILE_OPEN) {
 385                 lyx_view_->dispatch(cmd0);
 386                 return;
 387         }
 388
 389         theLyXFunc().setLyXView(lyx_view_);
 390
 391         FuncRequest cmd;
 392
 393         if (cmd0.action == LFUN_MOUSE_PRESS) {
 394                 if (mod == ShiftModifier)
 395                         cmd = FuncRequest(cmd0, "region-select");
 396                 else if (mod == ControlModifier)
 397                         cmd = FuncRequest(cmd0, "paragraph-select");
 398                 else
 399                         cmd = cmd0;
 400         }
 401         else
 402                 cmd = cmd0;
 403
 404         bool const notJustMovingTheMouse =
 405                 cmd.action != LFUN_MOUSE_MOTION || cmd.button() != mouse_button::none;
 406
 407         // In order to avoid bad surprise in the middle of an operation, we better stop
 408         // the blinking cursor.
 409         if (notJustMovingTheMouse)
 410                 stopBlinkingCursor();
 411
 412         buffer_view_->mouseEventDispatch(cmd);
 413
 414         // Skip these when selecting
 415         if (cmd.action != LFUN_MOUSE_MOTION) {
 416                 completer_.updateVisibility(false, false);
 417                 lyx_view_->updateLayoutList();
 418                 lyx_view_->updateToolbars();
 419         }
 420
 421         // GUI tweaks except with mouse motion with no button pressed.
 422         if (notJustMovingTheMouse) {
 423                 // Slight hack: this is only called currently when we
 424                 // clicked somewhere, so we force through the display
 425                 // of the new status here.
 426                 lyx_view_->clearMessage();
 427
 428                 // Show the cursor immediately after any operation
 429                 startBlinkingCursor();
 430         }
 431 }
 432
 433
 434 void GuiWorkArea::resizeBufferView()
 435 {
 436         // WARNING: Please don't put any code that will trigger a repaint here!
 437         // We are already inside a paint event.
 438         lyx_view_->setBusy(true);
 439         buffer_view_->resize(viewport()->width(), viewport()->height());
 440         updateScreen();
 441
 442         // Update scrollbars which might have changed due different
 443         // BufferView dimension. This is especially important when the
 444         // BufferView goes from zero-size to the real-size for the first time,
 445         // as the scrollbar paramters are then set for the first time.
 446         updateScrollbar();
 447
 448         lyx_view_->updateLayoutList();
 449         lyx_view_->setBusy(false);
 450         need_resize_ = false;
 451 }
 452
 453
 454 void GuiWorkArea::showCursor()
 455 {
 456         if (cursor_visible_)
 457                 return;
 458
 459         // RTL or not RTL
 460         bool l_shape = false;
 461         Font const & realfont = buffer_view_->cursor().real_current_font;
 462         BufferParams const & bp = buffer_view_->buffer().params();
 463         bool const samelang = realfont.language() == bp.language;
 464         bool const isrtl = realfont.isVisibleRightToLeft();
 465
 466         if (!samelang || isrtl != bp.language->rightToLeft())
 467                 l_shape = true;
 468
 469         // The ERT language hack needs fixing up
 470         if (realfont.language() == latex_language)
 471                 l_shape = false;
 472
 473         Font const font = buffer_view_->cursor().getFont();
 474         FontMetrics const & fm = theFontMetrics(font);
 475         int const asc = fm.maxAscent();
 476         int const des = fm.maxDescent();
 477         int h = asc + des;
 478         int x = 0;
 479         int y = 0;
 480         Cursor & cur = buffer_view_->cursor();
 481         cur.getPos(x, y);
 482         y -= asc;
 483
 484         // if it doesn't touch the screen, don't try to show it
 485         bool cursorInView = true;
 486         if (y + h < 0 || y >= viewport()->height())
 487                 cursorInView = false;
 488
 489         // show cursor on screen
 490         bool completable = completer_.completionAvailable();
 491         if (cursorInView) {
 492                 cursor_visible_ = true;
 493                 showCursor(x, y, h, l_shape, isrtl, completable);
 494         }
 495 }
 496
 497
 498 void GuiWorkArea::hideCursor()
 499 {
 500         if (!cursor_visible_)
 501                 return;
 502
 503         cursor_visible_ = false;
 504         removeCursor();
 505 }
 506
 507
 508 void GuiWorkArea::toggleCursor()
 509 {
 510         if (cursor_visible_)
 511                 hideCursor();
 512         else
 513                 showCursor();
 514 }
 515
 516
 517 void GuiWorkArea::updateScrollbar()
 518 {
 519         ScrollbarParameters const & scroll_ = buffer_view_->scrollbarParameters();
 520
 521         verticalScrollBar()->setRange(scroll_.min, scroll_.max);
 522         verticalScrollBar()->setPageStep(scroll_.page_step);
 523         verticalScrollBar()->setSingleStep(scroll_.single_step);
 524         // Block the scrollbar signal to prevent recursive signal/slot calling.
 525         verticalScrollBar()->blockSignals(true);
 526         verticalScrollBar()->setValue(scroll_.position);
 527         verticalScrollBar()->setSliderPosition(scroll_.position);
 528         verticalScrollBar()->blockSignals(false);
 529 }
 530
 531
 532 void GuiWorkArea::scrollTo(int value)
 533 {
 534         stopBlinkingCursor();
 535         buffer_view_->scrollDocView(value);
 536
 537         if (lyxrc.cursor_follows_scrollbar) {
 538                 buffer_view_->setCursorFromScrollbar();
 539                 lyx_view_->updateLayoutList();
 540         }
 541         // Show the cursor immediately after any operation.
 542         startBlinkingCursor();
 543         QApplication::syncX();
 544 }
 545
 546
 547 bool GuiWorkArea::event(QEvent * e)
 548 {
 549         switch (e->type()) {
 550         case QEvent::ToolTip: {
 551                 QHelpEvent * helpEvent = static_cast<QHelpEvent *>(e);
 552                 if (lyxrc.use_tooltip) {
 553                         QPoint pos = helpEvent->pos();
 554                         if (pos.x() < viewport()->width()) {
 555                                 QString s = toqstr(buffer_view_->toolTip(pos.x(), pos.y()));
 556                                 QToolTip::showText(helpEvent->globalPos(), s);
 557                         }
 558                         else
 559                                 QToolTip::hideText();
 560                 }
 561                 // Don't forget to accept the event!
 562                 e->accept();
 563                 return true;
 564         }
 565
 566         case QEvent::ShortcutOverride: {
 567                 // We catch this event in order to catch the Tab or Shift+Tab key press
 568                 // which are otherwise reserved to focus switching between controls
 569                 // within a dialog.
 570                 QKeyEvent * ke = static_cast<QKeyEvent*>(e);
 571                 if ((ke->key() != Qt::Key_Tab && ke->key() != Qt::Key_Backtab)
 572                         || ke->modifiers() & Qt::ControlModifier)
 573                         return QAbstractScrollArea::event(e);
 574                 keyPressEvent(ke);
 575                 return true;
 576         }
 577
 578         default:
 579                 return QAbstractScrollArea::event(e);
 580         }
 581         return false;
 582 }
 583
 584
 585 void GuiWorkArea::contextMenuEvent(QContextMenuEvent * e)
 586 {
 587         QPoint pos = e->pos();
 588         docstring name = buffer_view_->contextMenu(pos.x(), pos.y());
 589         if (name.empty()) {
 590                 QAbstractScrollArea::contextMenuEvent(e);
 591                 return;
 592         }
 593         QMenu * menu = guiApp->menus().menu(toqstr(name));
 594         if (!menu) {
 595                 QAbstractScrollArea::contextMenuEvent(e);
 596                 return;
 597         }
 598         // Position the menu to the right.
 599         // FIXME: menu position should be different for RTL text.
 600         menu->exec(e->globalPos());
 601         e->accept();
 602 }
 603
 604
 605 void GuiWorkArea::focusInEvent(QFocusEvent * e)
 606 {
 607         lyx_view_->setCurrentWorkArea(this);
 608         // Repaint the whole screen.
 609         // Note: this is different from redraw() as only the backing pixmap
 610         // will be redrawn, which is cheap.
 611         viewport()->repaint();
 612
 613         startBlinkingCursor();
 614         QAbstractScrollArea::focusInEvent(e);
 615 }
 616
 617
 618 void GuiWorkArea::focusOutEvent(QFocusEvent * e)
 619 {
 620         stopBlinkingCursor();
 621         QAbstractScrollArea::focusOutEvent(e);
 622 }
 623
 624
 625 void GuiWorkArea::mousePressEvent(QMouseEvent * e)
 626 {
 627         if (dc_event_.active && dc_event_ == *e) {
 628                 dc_event_.active = false;
 629                 FuncRequest cmd(LFUN_MOUSE_TRIPLE, e->x(), e->y(),
 630                         q_button_state(e->button()));
 631                 dispatch(cmd);
 632                 e->accept();
 633                 return;
 634         }
 635
 636         inputContext()->reset();
 637
 638         FuncRequest const cmd(LFUN_MOUSE_PRESS, e->x(), e->y(),
 639                 q_button_state(e->button()));
 640         dispatch(cmd, q_key_state(e->modifiers()));
 641         e->accept();
 642 }
 643
 644
 645 void GuiWorkArea::mouseReleaseEvent(QMouseEvent * e)
 646 {
 647         if (synthetic_mouse_event_.timeout.running())
 648                 synthetic_mouse_event_.timeout.stop();
 649
 650         FuncRequest const cmd(LFUN_MOUSE_RELEASE, e->x(), e->y(),
 651                               q_button_state(e->button()));
 652         dispatch(cmd);
 653         e->accept();
 654 }
 655
 656
 657 void GuiWorkArea::mouseMoveEvent(QMouseEvent * e)
 658 {
 659         // we kill the triple click if we move
 660         doubleClickTimeout();
 661         FuncRequest cmd(LFUN_MOUSE_MOTION, e->x(), e->y(),
 662                 q_motion_state(e->buttons()));
 663
 664         e->accept();
 665
 666         // If we're above or below the work area...
 667         if (e->y() <= 20 || e->y() >= viewport()->height() - 20) {
 668                 // Make sure only a synthetic event can cause a page scroll,
 669                 // so they come at a steady rate:
 670                 if (e->y() <= 20)
 671                         // _Force_ a scroll up:
 672                         cmd.y = -40;
 673                 else
 674                         cmd.y = viewport()->height();
 675                 // Store the event, to be handled when the timeout expires.
 676                 synthetic_mouse_event_.cmd = cmd;
 677
 678                 if (synthetic_mouse_event_.timeout.running())
 679                         // Discard the event. Note that it _may_ be handled
 680                         // when the timeout expires if
 681                         // synthetic_mouse_event_.cmd has not been overwritten.
 682                         // Ie, when the timeout expires, we handle the
 683                         // most recent event but discard all others that
 684                         // occurred after the one used to start the timeout
 685                         // in the first place.
 686                         return;
 687
 688                 synthetic_mouse_event_.restart_timeout = true;
 689                 synthetic_mouse_event_.timeout.start();
 690                 // Fall through to handle this event...
 691
 692         } else if (synthetic_mouse_event_.timeout.running()) {
 693                 // Store the event, to be possibly handled when the timeout
 694                 // expires.
 695                 // Once the timeout has expired, normal control is returned
 696                 // to mouseMoveEvent (restart_timeout = false).
 697                 // This results in a much smoother 'feel' when moving the
 698                 // mouse back into the work area.
 699                 synthetic_mouse_event_.cmd = cmd;
 700                 synthetic_mouse_event_.restart_timeout = false;
 701                 return;
 702         }
 703
 704         // Has anything changed on-screen since the last QMouseEvent
 705         // was received?
 706         double const scrollbar_value = verticalScrollBar()->value();
 707         if (e->x() == synthetic_mouse_event_.x_old
 708                 && e->y() == synthetic_mouse_event_.y_old
 709                 && scrollbar_value == synthetic_mouse_event_.scrollbar_value_old) {
 710                 // Nothing changed on-screen since the last QMouseEvent.
 711                 return;
 712         }
 713
 714         // Yes something has changed. Store the params used to check this.
 715         synthetic_mouse_event_.x_old = e->x();
 716         synthetic_mouse_event_.y_old = e->y();
 717         synthetic_mouse_event_.scrollbar_value_old = scrollbar_value;
 718
 719         // ... and dispatch the event to the LyX core.
 720         dispatch(cmd);
 721 }
 722
 723
 724 void GuiWorkArea::wheelEvent(QWheelEvent * e)
 725 {
 726         // Wheel rotation by one notch results in a delta() of 120 (see
 727         // documentation of QWheelEvent)
 728         double const lines = qApp->wheelScrollLines()
 729                 * lyxrc.mouse_wheel_speed
 730                 * e->delta() / 120.0;
 731         LYXERR(Debug::SCROLLING, "wheelScrollLines = " << qApp->wheelScrollLines()
 732                 << " delta = " << e->delta()
 733                 << " lines = " << lines);
 734         verticalScrollBar()->setValue(verticalScrollBar()->value() -
 735                 int(lines *  verticalScrollBar()->singleStep()));
 736         e->accept();
 737 }
 738
 739
 740 void GuiWorkArea::generateSyntheticMouseEvent()
 741 {
 742         // Set things off to generate the _next_ 'pseudo' event.
 743         if (synthetic_mouse_event_.restart_timeout)
 744                 synthetic_mouse_event_.timeout.start();
 745
 746         // Has anything changed on-screen since the last timeout signal
 747         // was received?
 748         double const scrollbar_value = verticalScrollBar()->value();
 749         if (scrollbar_value != synthetic_mouse_event_.scrollbar_value_old) {
 750                 // Yes it has. Store the params used to check this.
 751                 synthetic_mouse_event_.scrollbar_value_old = scrollbar_value;
 752
 753                 // ... and dispatch the event to the LyX core.
 754                 dispatch(synthetic_mouse_event_.cmd);
 755         }
 756 }
 757
 758
 759 void GuiWorkArea::keyPressEvent(QKeyEvent * ev)
 760 {
 761         // intercept some keys if completion popup is visible
 762         if (completer_.popupVisible()) {
 763                 switch (ev->key()) {
 764                 case Qt::Key_Enter:
 765                 case Qt::Key_Return:
 766                         completer_.activate();
 767                         ev->accept();
 768                         return;
 769                 }
 770         }
 771
 772         // intercept keys for the completion
 773         if (ev->key() == Qt::Key_Tab) {
 774                 completer_.tab();
 775                 ev->accept();
 776                 return;
 777         }
 778
 779         if (completer_.popupVisible() && ev->key() == Qt::Key_Escape) {
 780                 completer_.hidePopup();
 781                 ev->accept();
 782                 return;
 783         }
 784
 785         if (completer_.inlineVisible() && ev->key() == Qt::Key_Escape) {
 786                 completer_.hideInline();
 787                 ev->accept();
 788                 return;
 789         }
 790
 791         // do nothing if there are other events
 792         // (the auto repeated events come too fast)
 793         // \todo FIXME: remove hard coded Qt keys, process the key binding
 794 #ifdef Q_WS_X11
 795         if (XEventsQueued(QX11Info::display(), 0) > 1 && ev->isAutoRepeat()
 796                         && (Qt::Key_PageDown || Qt::Key_PageUp)) {
 797                 LYXERR(Debug::KEY, "system is busy: scroll key event ignored");
 798                 ev->ignore();
 799                 return;
 800         }
 801 #endif
 802
 803         LYXERR(Debug::KEY, " count: " << ev->count()
 804                 << " text: " << fromqstr(ev->text())
 805                 << " isAutoRepeat: " << ev->isAutoRepeat() << " key: " << ev->key());
 806
 807         KeySymbol sym;
 808         setKeySymbol(&sym, ev);
 809         processKeySym(sym, q_key_state(ev->modifiers()));
 810         ev->accept();
 811 }
 812
 813
 814 void GuiWorkArea::doubleClickTimeout()
 815 {
 816         dc_event_.active = false;
 817 }
 818
 819
 820 void GuiWorkArea::mouseDoubleClickEvent(QMouseEvent * ev)
 821 {
 822         dc_event_ = DoubleClick(ev);
 823         QTimer::singleShot(QApplication::doubleClickInterval(), this,
 824                            SLOT(doubleClickTimeout()));
 825         FuncRequest cmd(LFUN_MOUSE_DOUBLE,
 826                         ev->x(), ev->y(),
 827                         q_button_state(ev->button()));
 828         dispatch(cmd);
 829         ev->accept();
 830 }
 831
 832
 833 void GuiWorkArea::resizeEvent(QResizeEvent * ev)
 834 {
 835         QAbstractScrollArea::resizeEvent(ev);
 836         need_resize_ = true;
 837         ev->accept();
 838 }
 839
 840
 841 void GuiWorkArea::update(int x, int y, int w, int h)
 842 {
 843         viewport()->repaint(x, y, w, h);
 844 }
 845
 846
 847 void GuiWorkArea::paintEvent(QPaintEvent * ev)
 848 {
 849         QRect const rc = ev->rect();
 850         // LYXERR(Debug::PAINTING, "paintEvent begin: x: " << rc.x()
 851         //      << " y: " << rc.y() << " w: " << rc.width() << " h: " << rc.height());
 852
 853         if (need_resize_) {
 854                 screen_ = QPixmap(viewport()->width(), viewport()->height());
 855                 resizeBufferView();
 856                 hideCursor();
 857                 showCursor();
 858         }
 859
 860         QPainter pain(viewport());
 861         pain.drawPixmap(rc, screen_, rc);
 862         cursor_->draw(pain);
 863         ev->accept();
 864 }
 865
 866
 867 void GuiWorkArea::updateScreen()
 868 {
 869         GuiPainter pain(&screen_);
 870         buffer_view_->draw(pain);
 871 }
 872
 873
 874 void GuiWorkArea::showCursor(int x, int y, int h,
 875         bool l_shape, bool rtl, bool completable)
 876 {
 877         if (schedule_redraw_) {
 878                 buffer_view_->updateMetrics();
 879                 updateScreen();
 880                 viewport()->update(QRect(0, 0, viewport()->width(), viewport()->height()));
 881                 schedule_redraw_ = false;
 882                 // Show the cursor immediately after the update.
 883                 hideCursor();
 884                 toggleCursor();
 885                 return;
 886         }
 887
 888         cursor_->update(x, y, h, l_shape, rtl, completable);
 889         cursor_->show();
 890         viewport()->update(cursor_->rect());
 891 }
 892
 893
 894 void GuiWorkArea::removeCursor()
 895 {
 896         cursor_->hide();
 897         //if (!qApp->focusWidget())
 898                 viewport()->update(cursor_->rect());
 899 }
 900
 901
 902 void GuiWorkArea::inputMethodEvent(QInputMethodEvent * e)
 903 {
 904         QString const & commit_string = e->commitString();
 905         docstring const & preedit_string
 906                 = qstring_to_ucs4(e->preeditString());
 907
 908         if (!commit_string.isEmpty()) {
 909
 910                 LYXERR(Debug::KEY, "preeditString: " << fromqstr(e->preeditString())
 911                         << " commitString: " << fromqstr(e->commitString()));
 912
 913                 int key = 0;
 914
 915                 // FIXME Iwami 04/01/07: we should take care also of UTF16 surrogates here.
 916                 for (int i = 0; i != commit_string.size(); ++i) {
 917                         QKeyEvent ev(QEvent::KeyPress, key, Qt::NoModifier, commit_string[i]);
 918                         keyPressEvent(&ev);
 919                 }
 920         }
 921
 922         // Hide the cursor during the kana-kanji transformation.
 923         if (preedit_string.empty())
 924                 startBlinkingCursor();
 925         else
 926                 stopBlinkingCursor();
 927
 928         // last_width : for checking if last preedit string was/wasn't empty.
 929         static bool last_width = false;
 930         if (!last_width && preedit_string.empty()) {
 931                 // if last_width is last length of preedit string.
 932                 e->accept();
 933                 return;
 934         }
 935
 936         GuiPainter pain(&screen_);
 937         buffer_view_->updateMetrics();
 938         buffer_view_->draw(pain);
 939         FontInfo font = buffer_view_->cursor().getFont().fontInfo();
 940         FontMetrics const & fm = theFontMetrics(font);
 941         int height = fm.maxHeight();
 942         int cur_x = cursor_->rect().left();
 943         int cur_y = cursor_->rect().bottom();
 944
 945         // redraw area of preedit string.
 946         update(0, cur_y - height, viewport()->width(),
 947                 (height + 1) * preedit_lines_);
 948
 949         if (preedit_string.empty()) {
 950                 last_width = false;
 951                 preedit_lines_ = 1;
 952                 e->accept();
 953                 return;
 954         }
 955         last_width = true;
 956
 957         // att : stores an IM attribute.
 958         QList<QInputMethodEvent::Attribute> const & att = e->attributes();
 959
 960         // get attributes of input method cursor.
 961         // cursor_pos : cursor position in preedit string.
 962         size_t cursor_pos = 0;
 963         bool cursor_is_visible = false;
 964         for (int i = 0; i != att.size(); ++i) {
 965                 if (att.at(i).type == QInputMethodEvent::Cursor) {
 966                         cursor_pos = att.at(i).start;
 967                         cursor_is_visible = att.at(i).length != 0;
 968                         break;
 969                 }
 970         }
 971
 972         size_t preedit_length = preedit_string.length();
 973
 974         // get position of selection in input method.
 975         // FIXME: isn't there a way to do this simplier?
 976         // rStart : cursor position in selected string in IM.
 977         size_t rStart = 0;
 978         // rLength : selected string length in IM.
 979         size_t rLength = 0;
 980         if (cursor_pos < preedit_length) {
 981                 for (int i = 0; i != att.size(); ++i) {
 982                         if (att.at(i).type == QInputMethodEvent::TextFormat) {
 983                                 if (att.at(i).start <= int(cursor_pos)
 984                                         && int(cursor_pos) < att.at(i).start + att.at(i).length) {
 985                                                 rStart = att.at(i).start;
 986                                                 rLength = att.at(i).length;
 987                                                 if (!cursor_is_visible)
 988                                                         cursor_pos += rLength;
 989                                                 break;
 990                                 }
 991                         }
 992                 }
 993         }
 994         else {
 995                 rStart = cursor_pos;
 996                 rLength = 0;
 997         }
 998
 999         int const right_margin = buffer_view_->rightMargin();
1000         Painter::preedit_style ps;
1001         // Most often there would be only one line:
1002         preedit_lines_ = 1;
1003         for (size_t pos = 0; pos != preedit_length; ++pos) {
1004                 char_type const typed_char = preedit_string[pos];
1005                 // reset preedit string style
1006                 ps = Painter::preedit_default;
1007
1008                 // if we reached the right extremity of the screen, go to next line.
1009                 if (cur_x + fm.width(typed_char) > viewport()->width() - right_margin) {
1010                         cur_x = right_margin;
1011                         cur_y += height + 1;
1012                         ++preedit_lines_;
1013                 }
1014                 // preedit strings are displayed with dashed underline
1015                 // and partial strings are displayed white on black indicating
1016                 // that we are in selecting mode in the input method.
1017                 // FIXME: rLength == preedit_length is not a changing condition
1018                 // FIXME: should be put out of the loop.
1019                 if (pos >= rStart
1020                         && pos < rStart + rLength
1021                         && !(cursor_pos < rLength && rLength == preedit_length))
1022                         ps = Painter::preedit_selecting;
1023
1024                 if (pos == cursor_pos
1025                         && (cursor_pos < rLength && rLength == preedit_length))
1026                         ps = Painter::preedit_cursor;
1027
1028                 // draw one character and update cur_x.
1029                 cur_x += pain.preeditText(cur_x, cur_y, typed_char, font, ps);
1030         }
1031
1032         // update the preedit string screen area.
1033         update(0, cur_y - preedit_lines_*height, viewport()->width(),
1034                 (height + 1) * preedit_lines_);
1035
1036         // Don't forget to accept the event!
1037         e->accept();
1038 }
1039
1040
1041 QVariant GuiWorkArea::inputMethodQuery(Qt::InputMethodQuery query) const
1042 {
1043         QRect cur_r(0,0,0,0);
1044         switch (query) {
1045                 // this is the CJK-specific composition window position.
1046                 case Qt::ImMicroFocus:
1047                         cur_r = cursor_->rect();
1048                         if (preedit_lines_ != 1)
1049                                 cur_r.moveLeft(10);
1050                         cur_r.moveBottom(cur_r.bottom() + cur_r.height() * preedit_lines_);
1051                         // return lower right of cursor in LyX.
1052                         return cur_r;
1053                 default:
1054                         return QWidget::inputMethodQuery(query);
1055         }
1056 }
1057
1058
1059 void GuiWorkArea::updateWindowTitle()
1060 {
1061         docstring maximize_title;
1062         docstring minimize_title;
1063
1064         Buffer & buf = buffer_view_->buffer();
1065         FileName const fileName = buf.fileName();
1066         if (!fileName.empty()) {
1067                 maximize_title = fileName.displayName(30);
1068                 minimize_title = from_utf8(fileName.onlyFileName());
1069                 if (!buf.isClean()) {
1070                         maximize_title += _(" (changed)");
1071                         minimize_title += char_type('*');
1072                 }
1073                 if (buf.isReadonly())
1074                         maximize_title += _(" (read only)");
1075         }
1076
1077         QString title = windowTitle();
1078         QString new_title = toqstr(maximize_title);
1079         if (title == new_title)
1080                 return;
1081
1082         QWidget::setWindowTitle(new_title);
1083         QWidget::setWindowIconText(toqstr(minimize_title));
1084         titleChanged(this);
1085 }
1086
1087
1088 void GuiWorkArea::setReadOnly(bool)
1089 {
1090         updateWindowTitle();
1091         if (this == lyx_view_->currentWorkArea())
1092                 lyx_view_->updateBufferDependent(false);
1093 }
1094
1095
1096 bool GuiWorkArea::isFullScreen()
1097 {
1098         return lyx_view_ && lyx_view_->isFullScreen();
1099 }
1100
1101
1102 ////////////////////////////////////////////////////////////////////
1103 //
1104 // TabWorkArea
1105 //
1106 ////////////////////////////////////////////////////////////////////
1107
1108 TabWorkArea::TabWorkArea(QWidget * parent) : QTabWidget(parent)
1109 {
1110         QPalette pal = palette();
1111         pal.setColor(QPalette::Active, QPalette::Button,
1112                 pal.color(QPalette::Active, QPalette::Window));
1113         pal.setColor(QPalette::Disabled, QPalette::Button,
1114                 pal.color(QPalette::Disabled, QPalette::Window));
1115         pal.setColor(QPalette::Inactive, QPalette::Button,
1116                 pal.color(QPalette::Inactive, QPalette::Window));
1117
1118         QObject::connect(this, SIGNAL(currentChanged(int)),
1119                 this, SLOT(on_currentTabChanged(int)));
1120
1121         QToolButton * closeBufferButton = new QToolButton(this);
1122     closeBufferButton->setPalette(pal);
1123         // FIXME: rename the icon to closebuffer.png
1124         closeBufferButton->setIcon(QIcon(":/images/closetab.png"));
1125         closeBufferButton->setText("Close File");
1126         closeBufferButton->setAutoRaise(true);
1127         closeBufferButton->setCursor(Qt::ArrowCursor);
1128         closeBufferButton->setToolTip(qt_("Close File"));
1129         closeBufferButton->setEnabled(true);
1130         QObject::connect(closeBufferButton, SIGNAL(clicked()),
1131                 this, SLOT(closeCurrentBuffer()));
1132         setCornerWidget(closeBufferButton, Qt::TopRightCorner);
1133
1134         QToolButton * closeTabButton = new QToolButton(this);
1135     closeTabButton->setPalette(pal);
1136         closeTabButton->setIcon(QIcon(":/images/hidetab.png"));
1137         closeTabButton->setText("Hide tab");
1138         closeTabButton->setAutoRaise(true);
1139         closeTabButton->setCursor(Qt::ArrowCursor);
1140         closeTabButton->setToolTip(qt_("Hide tab"));
1141         closeTabButton->setEnabled(true);
1142         QObject::connect(closeTabButton, SIGNAL(clicked()),
1143                 this, SLOT(closeCurrentTab()));
1144         setCornerWidget(closeTabButton, Qt::TopLeftCorner);
1145
1146         setUsesScrollButtons(true);
1147 }
1148
1149
1150 void TabWorkArea::setFullScreen(bool full_screen)
1151 {
1152         for (int i = 0; i != count(); ++i) {
1153                 if (GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i)))
1154                         wa->setFullScreen(full_screen);
1155         }
1156
1157         if (lyxrc.full_screen_tabbar)
1158                 showBar(!full_screen && count()>1);
1159 }
1160
1161
1162 void TabWorkArea::showBar(bool show)
1163 {
1164         tabBar()->setEnabled(show);
1165         tabBar()->setVisible(show);
1166 }
1167
1168
1169 GuiWorkArea * TabWorkArea::currentWorkArea()
1170 {
1171         if (count() == 0)
1172                 return 0;
1173
1174         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(currentWidget());
1175         BOOST_ASSERT(wa);
1176         return wa;
1177 }
1178
1179
1180 GuiWorkArea * TabWorkArea::workArea(Buffer & buffer)
1181 {
1182         for (int i = 0; i != count(); ++i) {
1183                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i));
1184                 BOOST_ASSERT(wa);
1185                 if (&wa->bufferView().buffer() == &buffer)
1186                         return wa;
1187         }
1188         return 0;
1189 }
1190
1191
1192 void TabWorkArea::closeAll()
1193 {
1194         while (count()) {
1195                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(0));
1196                 BOOST_ASSERT(wa);
1197                 removeTab(0);
1198                 delete wa;
1199         }
1200 }
1201
1202
1203 bool TabWorkArea::setCurrentWorkArea(GuiWorkArea * work_area)
1204 {
1205         BOOST_ASSERT(work_area);
1206         int index = indexOf(work_area);
1207         if (index == -1)
1208                 return false;
1209
1210         if (index == currentIndex())
1211                 // Make sure the work area is up to date.
1212                 on_currentTabChanged(index);
1213         else
1214                 // Switch to the work area.
1215                 setCurrentIndex(index);
1216         work_area->setFocus();
1217
1218         return true;
1219 }
1220
1221
1222 GuiWorkArea * TabWorkArea::addWorkArea(Buffer & buffer, GuiView & view)
1223 {
1224         GuiWorkArea * wa = new GuiWorkArea(buffer, view);
1225         wa->setUpdatesEnabled(false);
1226         // Hide tabbar if there's no tab (avoid a resize and a flashing tabbar
1227         // when hiding it again below).
1228         if (!(currentWorkArea() && currentWorkArea()->isFullScreen()))
1229                 showBar(count() > 0);
1230         addTab(wa, wa->windowTitle());
1231         QObject::connect(wa, SIGNAL(titleChanged(GuiWorkArea *)),
1232                 this, SLOT(updateTabText(GuiWorkArea *)));
1233         if (currentWorkArea() && currentWorkArea()->isFullScreen())
1234                 setFullScreen(true);
1235         else
1236                 // Hide tabbar if there's only one tab.
1237                 showBar(count() > 1);
1238
1239         return wa;
1240 }
1241
1242
1243 bool TabWorkArea::removeWorkArea(GuiWorkArea * work_area)
1244 {
1245         BOOST_ASSERT(work_area);
1246         int index = indexOf(work_area);
1247         if (index == -1)
1248                 return false;
1249
1250         work_area->setUpdatesEnabled(false);
1251         removeTab(index);
1252         delete work_area;
1253
1254         if (count()) {
1255                 // make sure the next work area is enabled.
1256                 currentWidget()->setUpdatesEnabled(true);
1257                 if ((currentWorkArea() && currentWorkArea()->isFullScreen()))
1258                         setFullScreen(true);
1259                 else
1260                         // Hide tabbar if there's only one tab.
1261                         showBar(count() > 1);
1262         }
1263         return true;
1264 }
1265
1266
1267 void TabWorkArea::on_currentTabChanged(int i)
1268 {
1269         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i));
1270         BOOST_ASSERT(wa);
1271         BufferView & bv = wa->bufferView();
1272         bv.cursor().fixIfBroken();
1273         bv.updateMetrics();
1274         wa->setUpdatesEnabled(true);
1275         wa->redraw();
1276         wa->setFocus();
1277         ///
1278         currentWorkAreaChanged(wa);
1279
1280         LYXERR(Debug::GUI, "currentTabChanged " << i
1281                 << "File" << bv.buffer().absFileName());
1282 }
1283
1284
1285 void TabWorkArea::closeCurrentBuffer()
1286 {
1287         lyx::dispatch(FuncRequest(LFUN_BUFFER_CLOSE));
1288 }
1289
1290
1291 void TabWorkArea::closeCurrentTab()
1292 {
1293         removeWorkArea(currentWorkArea());
1294 }
1295
1296
1297 void TabWorkArea::updateTabText(GuiWorkArea * wa)
1298 {
1299         int const i = indexOf(wa);
1300         if (i < 0)
1301                 return;
1302         setTabText(i, wa->windowTitle());
1303 }
1304
1305 } // namespace frontend
1306 } // namespace lyx
1307
1308 #include "GuiWorkArea_moc.cpp"