src/frontends/qt4/GuiWorkArea.cpp

   1 /**
   2  * \file GuiWorkArea.cpp
   3  * This file is part of LyX, the document processor.
   4  * Licence details can be found in the file COPYING.
   5  *
   6  * \author John Levon
   7  * \author Abdelrazak Younes
   8  *
   9  * Full author contact details are available in file CREDITS.
  10  */
  11
  12 #include <config.h>
  13
  14 #include "GuiWorkArea.h"
  15
  16 #include "Buffer.h"
  17 #include "BufferParams.h"
  18 #include "BufferView.h"
  19 #include "CoordCache.h"
  20 #include "Cursor.h"
  21 #include "Font.h"
  22 #include "FuncRequest.h"
  23 #include "GuiApplication.h"
  24 #include "GuiKeySymbol.h"
  25 #include "GuiPainter.h"
  26 #include "GuiPopupMenu.h"
  27 #include "GuiView.h"
  28 #include "KeySymbol.h"
  29 #include "Language.h"
  30 #include "LyXFunc.h"
  31 #include "LyXRC.h"
  32 #include "MetricsInfo.h"
  33 #include "qt_helpers.h"
  34 #include "version.h"
  35
  36 #include "graphics/GraphicsImage.h"
  37 #include "graphics/GraphicsLoader.h"
  38
  39 #include "support/debug.h"
  40 #include "support/gettext.h"
  41 #include "support/FileName.h"
  42
  43 #include "frontends/Application.h"
  44 #include "frontends/FontMetrics.h"
  45 #include "frontends/WorkAreaManager.h"
  46
  47 #include <QContextMenuEvent>
  48 #include <QInputContext>
  49 #include <QHelpEvent>
  50 #include <QMainWindow>
  51 #include <QPainter>
  52 #include <QPalette>
  53 #include <QScrollBar>
  54 #include <QTabBar>
  55 #include <QTimer>
  56 #include <QToolButton>
  57 #include <QToolTip>
  58
  59 #include <boost/bind.hpp>
  60
  61 #ifdef Q_WS_X11
  62 #include <QX11Info>
  63 extern "C" int XEventsQueued(Display *display, int mode);
  64 #endif
  65
  66 #ifdef Q_WS_WIN
  67 int const CursorWidth = 2;
  68 #else
  69 int const CursorWidth = 1;
  70 #endif
  71
  72 #undef KeyPress
  73 #undef NoModifier
  74
  75 using namespace std;
  76 using namespace lyx::support;
  77
  78 namespace lyx {
  79
  80
  81 /// return the LyX mouse button state from Qt's
  82 static mouse_button::state q_button_state(Qt::MouseButton button)
  83 {
  84         mouse_button::state b = mouse_button::none;
  85         switch (button) {
  86                 case Qt::LeftButton:
  87                         b = mouse_button::button1;
  88                         break;
  89                 case Qt::MidButton:
  90                         b = mouse_button::button2;
  91                         break;
  92                 case Qt::RightButton:
  93                         b = mouse_button::button3;
  94                         break;
  95                 default:
  96                         break;
  97         }
  98         return b;
  99 }
 100
 101
 102 /// return the LyX mouse button state from Qt's
 103 mouse_button::state q_motion_state(Qt::MouseButtons state)
 104 {
 105         mouse_button::state b = mouse_button::none;
 106         if (state & Qt::LeftButton)
 107                 b |= mouse_button::button1;
 108         if (state & Qt::MidButton)
 109                 b |= mouse_button::button2;
 110         if (state & Qt::RightButton)
 111                 b |= mouse_button::button3;
 112         return b;
 113 }
 114
 115
 116 namespace frontend {
 117
 118 class CursorWidget {
 119 public:
 120         CursorWidget() {}
 121
 122         void draw(QPainter & painter)
 123         {
 124                 if (show_ && rect_.isValid()) {
 125                         switch (shape_) {
 126                         case L_SHAPE:
 127                                 painter.fillRect(rect_.x(), rect_.y(), CursorWidth, rect_.height(), color_);
 128                                 painter.setPen(color_);
 129                                 painter.drawLine(rect_.bottomLeft().x() + CursorWidth, rect_.bottomLeft().y(),
 130                                                                                                  rect_.bottomRight().x(), rect_.bottomLeft().y());
 131                                 break;
 132
 133                         case REVERSED_L_SHAPE:
 134                                 painter.fillRect(rect_.x() + rect_.height() / 3, rect_.y(), CursorWidth, rect_.height(), color_);
 135                                 painter.setPen(color_);
 136                                 painter.drawLine(rect_.bottomRight().x() - CursorWidth, rect_.bottomLeft().y(),
 137                                                                                                          rect_.bottomLeft().x(), rect_.bottomLeft().y());
 138                                 break;
 139
 140                         default:
 141                                 painter.fillRect(rect_, color_);
 142                                 break;
 143                         }
 144                 }
 145         }
 146
 147         void update(int x, int y, int h, CursorShape shape)
 148         {
 149                 color_ = guiApp->colorCache().get(Color_cursor);
 150                 shape_ = shape;
 151                 switch (shape) {
 152                 case L_SHAPE:
 153                         rect_ = QRect(x, y, CursorWidth + h / 3, h);
 154                         break;
 155                 case REVERSED_L_SHAPE:
 156                         rect_ = QRect(x - h / 3, y, CursorWidth + h / 3, h);
 157                         break;
 158                 default:
 159                         rect_ = QRect(x, y, CursorWidth, h);
 160                         break;
 161                 }
 162         }
 163
 164         void show(bool set_show = true) { show_ = set_show; }
 165         void hide() { show_ = false; }
 166
 167         QRect const & rect() { return rect_; }
 168
 169 private:
 170         ///
 171         CursorShape shape_;
 172         ///
 173         bool show_;
 174         ///
 175         QColor color_;
 176         ///
 177         QRect rect_;
 178 };
 179
 180
 181 // This is a 'heartbeat' generating synthetic mouse move events when the
 182 // cursor is at the top or bottom edge of the viewport. One scroll per 0.2 s
 183 SyntheticMouseEvent::SyntheticMouseEvent()
 184         : timeout(200), restart_timeout(true),
 185           x_old(-1), y_old(-1), scrollbar_value_old(-1.0)
 186 {}
 187
 188
 189
 190 GuiWorkArea::GuiWorkArea(Buffer & buffer, GuiView & lv)
 191         : buffer_view_(new BufferView(buffer)), lyx_view_(&lv),
 192           cursor_visible_(false),
 193     need_resize_(false), schedule_redraw_(false),
 194                 preedit_lines_(1)
 195 {
 196         buffer.workAreaManager().add(this);
 197         // Setup the signals
 198         connect(&cursor_timeout_, SIGNAL(timeout()),
 199                 this, SLOT(toggleCursor()));
 200
 201         int const time = QApplication::cursorFlashTime() / 2;
 202         if (time > 0) {
 203                 cursor_timeout_.setInterval(time);
 204                 cursor_timeout_.start();
 205         } else
 206                 // let's initialize this just to be safe
 207                 cursor_timeout_.setInterval(500);
 208
 209         screen_ = QPixmap(viewport()->width(), viewport()->height());
 210         cursor_ = new frontend::CursorWidget();
 211         cursor_->hide();
 212
 213         setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 214         setAcceptDrops(true);
 215         setMouseTracking(true);
 216         setMinimumSize(100, 70);
 217         updateWindowTitle();
 218
 219         viewport()->setAutoFillBackground(false);
 220         // We don't need double-buffering nor SystemBackground on
 221         // the viewport because we have our own backing pixmap.
 222         viewport()->setAttribute(Qt::WA_NoSystemBackground);
 223
 224         setFocusPolicy(Qt::WheelFocus);
 225
 226         viewport()->setCursor(Qt::IBeamCursor);
 227
 228         synthetic_mouse_event_.timeout.timeout.connect(
 229                 boost::bind(&GuiWorkArea::generateSyntheticMouseEvent,
 230                                         this));
 231
 232         // Initialize the vertical Scroll Bar
 233         QObject::connect(verticalScrollBar(), SIGNAL(valueChanged(int)),
 234                 this, SLOT(scrollTo(int)));
 235
 236         LYXERR(Debug::GUI, "viewport width: " << viewport()->width()
 237                 << "  viewport height: " << viewport()->height());
 238
 239         // Enables input methods for asian languages.
 240         // Must be set when creating custom text editing widgets.
 241         setAttribute(Qt::WA_InputMethodEnabled, true);
 242 }
 243
 244
 245
 246 GuiWorkArea::~GuiWorkArea()
 247 {
 248         buffer_view_->buffer().workAreaManager().remove(this);
 249         delete buffer_view_;
 250         delete cursor_;
 251 }
 252
 253
 254 void GuiWorkArea::close()
 255 {
 256         lyx_view_->removeWorkArea(this);
 257 }
 258
 259
 260 void GuiWorkArea::setFullScreen(bool full_screen)
 261 {
 262         buffer_view_->setFullScreen(full_screen);
 263         if (full_screen) {
 264                 setFrameStyle(QFrame::NoFrame);
 265                 if (lyxrc.full_screen_scrollbar)
 266                         setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 267         } else {
 268                 setFrameStyle(QFrame::Box);
 269                 setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
 270         }
 271 }
 272
 273
 274 BufferView & GuiWorkArea::bufferView()
 275 {
 276         return *buffer_view_;
 277 }
 278
 279
 280 BufferView const & GuiWorkArea::bufferView() const
 281 {
 282         return *buffer_view_;
 283 }
 284
 285
 286 void GuiWorkArea::stopBlinkingCursor()
 287 {
 288         cursor_timeout_.stop();
 289         hideCursor();
 290 }
 291
 292
 293 void GuiWorkArea::startBlinkingCursor()
 294 {
 295         showCursor();
 296         //we're not supposed to cache this value.
 297         int const time = QApplication::cursorFlashTime() / 2;
 298         if (time <= 0)
 299                 return;
 300         cursor_timeout_.setInterval(time);
 301         cursor_timeout_.start();
 302 }
 303
 304
 305 void GuiWorkArea::redraw()
 306 {
 307         if (!isVisible())
 308                 // No need to redraw in this case.
 309                 return;
 310
 311         // No need to do anything if this is the current view. The BufferView
 312         // metrics are already up to date.
 313         if (lyx_view_ != guiApp->currentView()
 314                 || lyx_view_->currentWorkArea() != this) {
 315                 // FIXME: it would be nice to optimize for the off-screen case.
 316                 buffer_view_->updateMetrics();
 317                 buffer_view_->cursor().fixIfBroken();
 318         }
 319
 320         // update cursor position, because otherwise it has to wait until
 321         // the blinking interval is over
 322         if (cursor_visible_) {
 323                 hideCursor();
 324                 showCursor();
 325         }
 326
 327         LYXERR(Debug::WORKAREA, "WorkArea::redraw screen");
 328         updateScreen();
 329         update(0, 0, viewport()->width(), viewport()->height());
 330
 331         /// \warning: scrollbar updating *must* be done after the BufferView is drawn
 332         /// because \c BufferView::updateScrollbar() is called in \c BufferView::draw().
 333         updateScrollbar();
 334         lyx_view_->updateStatusBar();
 335
 336         if (lyxerr.debugging(Debug::WORKAREA))
 337                 buffer_view_->coordCache().dump();
 338 }
 339
 340
 341 void GuiWorkArea::processKeySym(KeySymbol const & key, KeyModifier mod)
 342 {
 343         // In order to avoid bad surprise in the middle of an operation,
 344         // we better stop the blinking cursor...
 345         // the cursor gets restarted in GuiView::restartCursor()
 346         stopBlinkingCursor();
 347
 348         theLyXFunc().setLyXView(lyx_view_);
 349         theLyXFunc().processKeySym(key, mod);
 350
 351 }
 352
 353
 354 void GuiWorkArea::dispatch(FuncRequest const & cmd0, KeyModifier mod)
 355 {
 356         // Handle drag&drop
 357         if (cmd0.action == LFUN_FILE_OPEN) {
 358                 lyx_view_->dispatch(cmd0);
 359                 return;
 360         }
 361
 362         theLyXFunc().setLyXView(lyx_view_);
 363
 364         FuncRequest cmd;
 365
 366         if (cmd0.action == LFUN_MOUSE_PRESS) {
 367                 if (mod == ShiftModifier)
 368                         cmd = FuncRequest(cmd0, "region-select");
 369                 else if (mod == ControlModifier)
 370                         cmd = FuncRequest(cmd0, "paragraph-select");
 371                 else
 372                         cmd = cmd0;
 373         }
 374         else
 375                 cmd = cmd0;
 376
 377         bool const notJustMovingTheMouse =
 378                 cmd.action != LFUN_MOUSE_MOTION || cmd.button() != mouse_button::none;
 379
 380         // In order to avoid bad surprise in the middle of an operation, we better stop
 381         // the blinking cursor.
 382         if (notJustMovingTheMouse)
 383                 stopBlinkingCursor();
 384
 385         buffer_view_->mouseEventDispatch(cmd);
 386
 387         // Skip these when selecting
 388         if (cmd.action != LFUN_MOUSE_MOTION) {
 389                 lyx_view_->updateLayoutList();
 390                 lyx_view_->updateToolbars();
 391         }
 392
 393         // GUI tweaks except with mouse motion with no button pressed.
 394         if (notJustMovingTheMouse) {
 395                 // Slight hack: this is only called currently when we
 396                 // clicked somewhere, so we force through the display
 397                 // of the new status here.
 398                 lyx_view_->clearMessage();
 399
 400                 // Show the cursor immediately after any operation
 401                 startBlinkingCursor();
 402         }
 403 }
 404
 405
 406 void GuiWorkArea::resizeBufferView()
 407 {
 408         // WARNING: Please don't put any code that will trigger a repaint here!
 409         // We are already inside a paint event.
 410         lyx_view_->setBusy(true);
 411         buffer_view_->resize(viewport()->width(), viewport()->height());
 412         updateScreen();
 413
 414         // Update scrollbars which might have changed due different
 415         // BufferView dimension. This is especially important when the
 416         // BufferView goes from zero-size to the real-size for the first time,
 417         // as the scrollbar paramters are then set for the first time.
 418         updateScrollbar();
 419
 420         lyx_view_->updateLayoutList();
 421         lyx_view_->setBusy(false);
 422         need_resize_ = false;
 423 }
 424
 425
 426 void GuiWorkArea::showCursor()
 427 {
 428         if (cursor_visible_)
 429                 return;
 430
 431         CursorShape shape = BAR_SHAPE;
 432
 433         Font const & realfont = buffer_view_->cursor().real_current_font;
 434         BufferParams const & bp = buffer_view_->buffer().params();
 435         bool const samelang = realfont.language() == bp.language;
 436         bool const isrtl = realfont.isVisibleRightToLeft();
 437
 438         if (!samelang || isrtl != bp.language->rightToLeft()) {
 439                 shape = L_SHAPE;
 440                 if (isrtl)
 441                         shape = REVERSED_L_SHAPE;
 442         }
 443
 444         // The ERT language hack needs fixing up
 445         if (realfont.language() == latex_language)
 446                 shape = BAR_SHAPE;
 447
 448         Font const font = buffer_view_->cursor().getFont();
 449         FontMetrics const & fm = theFontMetrics(font);
 450         int const asc = fm.maxAscent();
 451         int const des = fm.maxDescent();
 452         int h = asc + des;
 453         int x = 0;
 454         int y = 0;
 455         buffer_view_->cursor().getPos(x, y);
 456         y -= asc;
 457
 458         // if it doesn't touch the screen, don't try to show it
 459         if (y + h < 0 || y >= viewport()->height())
 460                 return;
 461
 462         cursor_visible_ = true;
 463         showCursor(x, y, h, shape);
 464 }
 465
 466
 467 void GuiWorkArea::hideCursor()
 468 {
 469         if (!cursor_visible_)
 470                 return;
 471
 472         cursor_visible_ = false;
 473         removeCursor();
 474 }
 475
 476
 477 void GuiWorkArea::toggleCursor()
 478 {
 479         if (cursor_visible_)
 480                 hideCursor();
 481         else
 482                 showCursor();
 483 }
 484
 485
 486 void GuiWorkArea::updateScrollbar()
 487 {
 488         ScrollbarParameters const & scroll_ = buffer_view_->scrollbarParameters();
 489
 490         verticalScrollBar()->setRange(scroll_.min, scroll_.max);
 491         verticalScrollBar()->setPageStep(scroll_.page_step);
 492         verticalScrollBar()->setSingleStep(scroll_.single_step);
 493         // Block the scrollbar signal to prevent recursive signal/slot calling.
 494         verticalScrollBar()->blockSignals(true);
 495         verticalScrollBar()->setValue(scroll_.position);
 496         verticalScrollBar()->setSliderPosition(scroll_.position);
 497         verticalScrollBar()->blockSignals(false);
 498 }
 499
 500
 501 void GuiWorkArea::scrollTo(int value)
 502 {
 503         stopBlinkingCursor();
 504         buffer_view_->scrollDocView(value);
 505
 506         if (lyxrc.cursor_follows_scrollbar) {
 507                 buffer_view_->setCursorFromScrollbar();
 508                 lyx_view_->updateLayoutList();
 509         }
 510         // Show the cursor immediately after any operation.
 511         startBlinkingCursor();
 512         QApplication::syncX();
 513 }
 514
 515
 516 bool GuiWorkArea::event(QEvent * e)
 517 {
 518         switch (e->type()) {
 519         case QEvent::ToolTip: {
 520                 QHelpEvent * helpEvent = static_cast<QHelpEvent *>(e);
 521                 if (lyxrc.use_tooltip) {
 522                         QPoint pos = helpEvent->pos();
 523                         if (pos.x() < viewport()->width()) {
 524                                 QString s = toqstr(buffer_view_->toolTip(pos.x(), pos.y()));
 525                                 QToolTip::showText(helpEvent->globalPos(), s);
 526                         }
 527                         else
 528                                 QToolTip::hideText();
 529                 }
 530                 // Don't forget to accept the event!
 531                 e->accept();
 532                 return true;
 533         }
 534
 535         case QEvent::ShortcutOverride: {
 536                 // We catch this event in order to catch the Tab or Shift+Tab key press
 537                 // which are otherwise reserved to focus switching between controls
 538                 // within a dialog.
 539                 QKeyEvent * ke = static_cast<QKeyEvent*>(e);
 540                 if ((ke->key() != Qt::Key_Tab && ke->key() != Qt::Key_Backtab)
 541                         || ke->modifiers() & Qt::ControlModifier)
 542                         return QAbstractScrollArea::event(e);
 543                 keyPressEvent(ke);
 544                 return true;
 545         }
 546
 547         default:
 548                 return QAbstractScrollArea::event(e);
 549         }
 550         return false;
 551 }
 552
 553
 554 void GuiWorkArea::contextMenuEvent(QContextMenuEvent * e)
 555 {
 556         QPoint pos = e->pos();
 557         docstring name = buffer_view_->contextMenu(pos.x(), pos.y());
 558         if (name.empty()) {
 559                 QAbstractScrollArea::contextMenuEvent(e);
 560                 return;
 561         }
 562         QMenu * menu = guiApp->menus().menu(toqstr(name));
 563         if (!menu) {
 564                 QAbstractScrollArea::contextMenuEvent(e);
 565                 return;
 566         }
 567         // Position the menu to the right.
 568         // FIXME: menu position should be different for RTL text.
 569         menu->exec(e->globalPos());
 570         e->accept();
 571 }
 572
 573
 574 void GuiWorkArea::focusInEvent(QFocusEvent * e)
 575 {
 576         lyx_view_->setCurrentWorkArea(this);
 577         // Repaint the whole screen.
 578         // Note: this is different from redraw() as only the backing pixmap
 579         // will be redrawn, which is cheap.
 580         viewport()->repaint();
 581
 582         startBlinkingCursor();
 583         QAbstractScrollArea::focusInEvent(e);
 584 }
 585
 586
 587 void GuiWorkArea::focusOutEvent(QFocusEvent * e)
 588 {
 589         stopBlinkingCursor();
 590         QAbstractScrollArea::focusOutEvent(e);
 591 }
 592
 593
 594 void GuiWorkArea::mousePressEvent(QMouseEvent * e)
 595 {
 596         if (dc_event_.active && dc_event_ == *e) {
 597                 dc_event_.active = false;
 598                 FuncRequest cmd(LFUN_MOUSE_TRIPLE, e->x(), e->y(),
 599                         q_button_state(e->button()));
 600                 dispatch(cmd);
 601                 e->accept();
 602                 return;
 603         }
 604
 605         inputContext()->reset();
 606
 607         FuncRequest const cmd(LFUN_MOUSE_PRESS, e->x(), e->y(),
 608                 q_button_state(e->button()));
 609         dispatch(cmd, q_key_state(e->modifiers()));
 610         e->accept();
 611 }
 612
 613
 614 void GuiWorkArea::mouseReleaseEvent(QMouseEvent * e)
 615 {
 616         if (synthetic_mouse_event_.timeout.running())
 617                 synthetic_mouse_event_.timeout.stop();
 618
 619         FuncRequest const cmd(LFUN_MOUSE_RELEASE, e->x(), e->y(),
 620                               q_button_state(e->button()));
 621         dispatch(cmd);
 622         e->accept();
 623 }
 624
 625
 626 void GuiWorkArea::mouseMoveEvent(QMouseEvent * e)
 627 {
 628         // we kill the triple click if we move
 629         doubleClickTimeout();
 630         FuncRequest cmd(LFUN_MOUSE_MOTION, e->x(), e->y(),
 631                 q_motion_state(e->buttons()));
 632
 633         e->accept();
 634
 635         // If we're above or below the work area...
 636         if (e->y() <= 20 || e->y() >= viewport()->height() - 20) {
 637                 // Make sure only a synthetic event can cause a page scroll,
 638                 // so they come at a steady rate:
 639                 if (e->y() <= 20)
 640                         // _Force_ a scroll up:
 641                         cmd.y = -40;
 642                 else
 643                         cmd.y = viewport()->height();
 644                 // Store the event, to be handled when the timeout expires.
 645                 synthetic_mouse_event_.cmd = cmd;
 646
 647                 if (synthetic_mouse_event_.timeout.running())
 648                         // Discard the event. Note that it _may_ be handled
 649                         // when the timeout expires if
 650                         // synthetic_mouse_event_.cmd has not been overwritten.
 651                         // Ie, when the timeout expires, we handle the
 652                         // most recent event but discard all others that
 653                         // occurred after the one used to start the timeout
 654                         // in the first place.
 655                         return;
 656
 657                 synthetic_mouse_event_.restart_timeout = true;
 658                 synthetic_mouse_event_.timeout.start();
 659                 // Fall through to handle this event...
 660
 661         } else if (synthetic_mouse_event_.timeout.running()) {
 662                 // Store the event, to be possibly handled when the timeout
 663                 // expires.
 664                 // Once the timeout has expired, normal control is returned
 665                 // to mouseMoveEvent (restart_timeout = false).
 666                 // This results in a much smoother 'feel' when moving the
 667                 // mouse back into the work area.
 668                 synthetic_mouse_event_.cmd = cmd;
 669                 synthetic_mouse_event_.restart_timeout = false;
 670                 return;
 671         }
 672
 673         // Has anything changed on-screen since the last QMouseEvent
 674         // was received?
 675         double const scrollbar_value = verticalScrollBar()->value();
 676         if (e->x() == synthetic_mouse_event_.x_old
 677                 && e->y() == synthetic_mouse_event_.y_old
 678                 && scrollbar_value == synthetic_mouse_event_.scrollbar_value_old) {
 679                 // Nothing changed on-screen since the last QMouseEvent.
 680                 return;
 681         }
 682
 683         // Yes something has changed. Store the params used to check this.
 684         synthetic_mouse_event_.x_old = e->x();
 685         synthetic_mouse_event_.y_old = e->y();
 686         synthetic_mouse_event_.scrollbar_value_old = scrollbar_value;
 687
 688         // ... and dispatch the event to the LyX core.
 689         dispatch(cmd);
 690 }
 691
 692
 693 void GuiWorkArea::wheelEvent(QWheelEvent * e)
 694 {
 695         // Wheel rotation by one notch results in a delta() of 120 (see
 696         // documentation of QWheelEvent)
 697         double const lines = qApp->wheelScrollLines()
 698                 * lyxrc.mouse_wheel_speed
 699                 * e->delta() / 120.0;
 700         LYXERR(Debug::SCROLLING, "wheelScrollLines = " << qApp->wheelScrollLines()
 701                 << " delta = " << e->delta()
 702                 << " lines = " << lines);
 703         verticalScrollBar()->setValue(verticalScrollBar()->value() -
 704                 int(lines *  verticalScrollBar()->singleStep()));
 705         e->accept();
 706 }
 707
 708
 709 void GuiWorkArea::generateSyntheticMouseEvent()
 710 {
 711         // Set things off to generate the _next_ 'pseudo' event.
 712         if (synthetic_mouse_event_.restart_timeout)
 713                 synthetic_mouse_event_.timeout.start();
 714
 715         // Has anything changed on-screen since the last timeout signal
 716         // was received?
 717         double const scrollbar_value = verticalScrollBar()->value();
 718         if (scrollbar_value != synthetic_mouse_event_.scrollbar_value_old) {
 719                 // Yes it has. Store the params used to check this.
 720                 synthetic_mouse_event_.scrollbar_value_old = scrollbar_value;
 721
 722                 // ... and dispatch the event to the LyX core.
 723                 dispatch(synthetic_mouse_event_.cmd);
 724         }
 725 }
 726
 727
 728 void GuiWorkArea::keyPressEvent(QKeyEvent * ev)
 729 {
 730         // do nothing if there are other events
 731         // (the auto repeated events come too fast)
 732         // \todo FIXME: remove hard coded Qt keys, process the key binding
 733 #ifdef Q_WS_X11
 734         if (XEventsQueued(QX11Info::display(), 0) > 1 && ev->isAutoRepeat()
 735                         && (Qt::Key_PageDown || Qt::Key_PageUp)) {
 736                 LYXERR(Debug::KEY, "system is busy: scroll key event ignored");
 737                 ev->ignore();
 738                 return;
 739         }
 740 #endif
 741
 742         LYXERR(Debug::KEY, " count: " << ev->count()
 743                 << " text: " << fromqstr(ev->text())
 744                 << " isAutoRepeat: " << ev->isAutoRepeat() << " key: " << ev->key());
 745
 746         KeySymbol sym;
 747         setKeySymbol(&sym, ev);
 748         processKeySym(sym, q_key_state(ev->modifiers()));
 749         ev->accept();
 750 }
 751
 752
 753 void GuiWorkArea::doubleClickTimeout()
 754 {
 755         dc_event_.active = false;
 756 }
 757
 758
 759 void GuiWorkArea::mouseDoubleClickEvent(QMouseEvent * ev)
 760 {
 761         dc_event_ = DoubleClick(ev);
 762         QTimer::singleShot(QApplication::doubleClickInterval(), this,
 763                            SLOT(doubleClickTimeout()));
 764         FuncRequest cmd(LFUN_MOUSE_DOUBLE,
 765                         ev->x(), ev->y(),
 766                         q_button_state(ev->button()));
 767         dispatch(cmd);
 768         ev->accept();
 769 }
 770
 771
 772 void GuiWorkArea::resizeEvent(QResizeEvent * ev)
 773 {
 774         QAbstractScrollArea::resizeEvent(ev);
 775         need_resize_ = true;
 776         ev->accept();
 777 }
 778
 779
 780 void GuiWorkArea::update(int x, int y, int w, int h)
 781 {
 782         viewport()->repaint(x, y, w, h);
 783 }
 784
 785
 786 void GuiWorkArea::paintEvent(QPaintEvent * ev)
 787 {
 788         QRect const rc = ev->rect();
 789         // LYXERR(Debug::PAINTING, "paintEvent begin: x: " << rc.x()
 790         //      << " y: " << rc.y() << " w: " << rc.width() << " h: " << rc.height());
 791
 792         if (need_resize_) {
 793                 screen_ = QPixmap(viewport()->width(), viewport()->height());
 794                 resizeBufferView();
 795                 hideCursor();
 796                 showCursor();
 797         }
 798
 799         QPainter pain(viewport());
 800         pain.drawPixmap(rc, screen_, rc);
 801         cursor_->draw(pain);
 802         ev->accept();
 803 }
 804
 805
 806 void GuiWorkArea::updateScreen()
 807 {
 808         GuiPainter pain(&screen_);
 809         buffer_view_->draw(pain);
 810 }
 811
 812
 813 void GuiWorkArea::showCursor(int x, int y, int h, CursorShape shape)
 814 {
 815         if (schedule_redraw_) {
 816                 buffer_view_->updateMetrics();
 817                 updateScreen();
 818                 viewport()->update(QRect(0, 0, viewport()->width(), viewport()->height()));
 819                 schedule_redraw_ = false;
 820                 // Show the cursor immediately after the update.
 821                 hideCursor();
 822                 toggleCursor();
 823                 return;
 824         }
 825
 826         cursor_->update(x, y, h, shape);
 827         cursor_->show();
 828         viewport()->update(cursor_->rect());
 829 }
 830
 831
 832 void GuiWorkArea::removeCursor()
 833 {
 834         cursor_->hide();
 835         //if (!qApp->focusWidget())
 836                 viewport()->update(cursor_->rect());
 837 }
 838
 839
 840 void GuiWorkArea::inputMethodEvent(QInputMethodEvent * e)
 841 {
 842         QString const & commit_string = e->commitString();
 843         docstring const & preedit_string
 844                 = qstring_to_ucs4(e->preeditString());
 845
 846         if (!commit_string.isEmpty()) {
 847
 848                 LYXERR(Debug::KEY, "preeditString: " << fromqstr(e->preeditString())
 849                         << " commitString: " << fromqstr(e->commitString()));
 850
 851                 int key = 0;
 852
 853                 // FIXME Iwami 04/01/07: we should take care also of UTF16 surrogates here.
 854                 for (int i = 0; i != commit_string.size(); ++i) {
 855                         QKeyEvent ev(QEvent::KeyPress, key, Qt::NoModifier, commit_string[i]);
 856                         keyPressEvent(&ev);
 857                 }
 858         }
 859
 860         // Hide the cursor during the kana-kanji transformation.
 861         if (preedit_string.empty())
 862                 startBlinkingCursor();
 863         else
 864                 stopBlinkingCursor();
 865
 866         // last_width : for checking if last preedit string was/wasn't empty.
 867         static bool last_width = false;
 868         if (!last_width && preedit_string.empty()) {
 869                 // if last_width is last length of preedit string.
 870                 e->accept();
 871                 return;
 872         }
 873
 874         GuiPainter pain(&screen_);
 875         buffer_view_->updateMetrics();
 876         buffer_view_->draw(pain);
 877         FontInfo font = buffer_view_->cursor().getFont().fontInfo();
 878         FontMetrics const & fm = theFontMetrics(font);
 879         int height = fm.maxHeight();
 880         int cur_x = cursor_->rect().left();
 881         int cur_y = cursor_->rect().bottom();
 882
 883         // redraw area of preedit string.
 884         update(0, cur_y - height, viewport()->width(),
 885                 (height + 1) * preedit_lines_);
 886
 887         if (preedit_string.empty()) {
 888                 last_width = false;
 889                 preedit_lines_ = 1;
 890                 e->accept();
 891                 return;
 892         }
 893         last_width = true;
 894
 895         // att : stores an IM attribute.
 896         QList<QInputMethodEvent::Attribute> const & att = e->attributes();
 897
 898         // get attributes of input method cursor.
 899         // cursor_pos : cursor position in preedit string.
 900         size_t cursor_pos = 0;
 901         bool cursor_is_visible = false;
 902         for (int i = 0; i != att.size(); ++i) {
 903                 if (att.at(i).type == QInputMethodEvent::Cursor) {
 904                         cursor_pos = att.at(i).start;
 905                         cursor_is_visible = att.at(i).length != 0;
 906                         break;
 907                 }
 908         }
 909
 910         size_t preedit_length = preedit_string.length();
 911
 912         // get position of selection in input method.
 913         // FIXME: isn't there a way to do this simplier?
 914         // rStart : cursor position in selected string in IM.
 915         size_t rStart = 0;
 916         // rLength : selected string length in IM.
 917         size_t rLength = 0;
 918         if (cursor_pos < preedit_length) {
 919                 for (int i = 0; i != att.size(); ++i) {
 920                         if (att.at(i).type == QInputMethodEvent::TextFormat) {
 921                                 if (att.at(i).start <= int(cursor_pos)
 922                                         && int(cursor_pos) < att.at(i).start + att.at(i).length) {
 923                                                 rStart = att.at(i).start;
 924                                                 rLength = att.at(i).length;
 925                                                 if (!cursor_is_visible)
 926                                                         cursor_pos += rLength;
 927                                                 break;
 928                                 }
 929                         }
 930                 }
 931         }
 932         else {
 933                 rStart = cursor_pos;
 934                 rLength = 0;
 935         }
 936
 937         int const right_margin = buffer_view_->rightMargin();
 938         Painter::preedit_style ps;
 939         // Most often there would be only one line:
 940         preedit_lines_ = 1;
 941         for (size_t pos = 0; pos != preedit_length; ++pos) {
 942                 char_type const typed_char = preedit_string[pos];
 943                 // reset preedit string style
 944                 ps = Painter::preedit_default;
 945
 946                 // if we reached the right extremity of the screen, go to next line.
 947                 if (cur_x + fm.width(typed_char) > viewport()->width() - right_margin) {
 948                         cur_x = right_margin;
 949                         cur_y += height + 1;
 950                         ++preedit_lines_;
 951                 }
 952                 // preedit strings are displayed with dashed underline
 953                 // and partial strings are displayed white on black indicating
 954                 // that we are in selecting mode in the input method.
 955                 // FIXME: rLength == preedit_length is not a changing condition
 956                 // FIXME: should be put out of the loop.
 957                 if (pos >= rStart
 958                         && pos < rStart + rLength
 959                         && !(cursor_pos < rLength && rLength == preedit_length))
 960                         ps = Painter::preedit_selecting;
 961
 962                 if (pos == cursor_pos
 963                         && (cursor_pos < rLength && rLength == preedit_length))
 964                         ps = Painter::preedit_cursor;
 965
 966                 // draw one character and update cur_x.
 967                 cur_x += pain.preeditText(cur_x, cur_y, typed_char, font, ps);
 968         }
 969
 970         // update the preedit string screen area.
 971         update(0, cur_y - preedit_lines_*height, viewport()->width(),
 972                 (height + 1) * preedit_lines_);
 973
 974         // Don't forget to accept the event!
 975         e->accept();
 976 }
 977
 978
 979 QVariant GuiWorkArea::inputMethodQuery(Qt::InputMethodQuery query) const
 980 {
 981         QRect cur_r(0,0,0,0);
 982         switch (query) {
 983                 // this is the CJK-specific composition window position.
 984                 case Qt::ImMicroFocus:
 985                         cur_r = cursor_->rect();
 986                         if (preedit_lines_ != 1)
 987                                 cur_r.moveLeft(10);
 988                         cur_r.moveBottom(cur_r.bottom() + cur_r.height() * preedit_lines_);
 989                         // return lower right of cursor in LyX.
 990                         return cur_r;
 991                 default:
 992                         return QWidget::inputMethodQuery(query);
 993         }
 994 }
 995
 996
 997 void GuiWorkArea::updateWindowTitle()
 998 {
 999         docstring maximize_title;
1000         docstring minimize_title;
1001
1002         Buffer & buf = buffer_view_->buffer();
1003         FileName const fileName = buf.fileName();
1004         if (!fileName.empty()) {
1005                 maximize_title = fileName.displayName(30);
1006                 minimize_title = from_utf8(fileName.onlyFileName());
1007                 if (!buf.isClean()) {
1008                         maximize_title += _(" (changed)");
1009                         minimize_title += char_type('*');
1010                 }
1011                 if (buf.isReadonly())
1012                         maximize_title += _(" (read only)");
1013         }
1014
1015         QString title = windowTitle();
1016         QString new_title = toqstr(maximize_title);
1017         if (title == new_title)
1018                 return;
1019
1020         QWidget::setWindowTitle(new_title);
1021         QWidget::setWindowIconText(toqstr(minimize_title));
1022         titleChanged(this);
1023 }
1024
1025
1026 void GuiWorkArea::setReadOnly(bool)
1027 {
1028         updateWindowTitle();
1029         if (this == lyx_view_->currentWorkArea())
1030                 lyx_view_->updateBufferDependent(false);
1031 }
1032
1033
1034 ////////////////////////////////////////////////////////////////////
1035 //
1036 // TabWorkArea
1037 //
1038 ////////////////////////////////////////////////////////////////////
1039
1040 TabWorkArea::TabWorkArea(QWidget * parent) : QTabWidget(parent)
1041 {
1042         QPalette pal = palette();
1043         pal.setColor(QPalette::Active, QPalette::Button,
1044                 pal.color(QPalette::Active, QPalette::Window));
1045         pal.setColor(QPalette::Disabled, QPalette::Button,
1046                 pal.color(QPalette::Disabled, QPalette::Window));
1047         pal.setColor(QPalette::Inactive, QPalette::Button,
1048                 pal.color(QPalette::Inactive, QPalette::Window));
1049
1050         QObject::connect(this, SIGNAL(currentChanged(int)),
1051                 this, SLOT(on_currentTabChanged(int)));
1052
1053         QToolButton * closeBufferButton = new QToolButton(this);
1054     closeBufferButton->setPalette(pal);
1055         // FIXME: rename the icon to closebuffer.png
1056         closeBufferButton->setIcon(QIcon(":/images/closetab.png"));
1057         closeBufferButton->setText("Close Buffer");
1058         closeBufferButton->setAutoRaise(true);
1059         closeBufferButton->setCursor(Qt::ArrowCursor);
1060         closeBufferButton->setToolTip(tr("Close Buffer"));
1061         closeBufferButton->setEnabled(true);
1062         QObject::connect(closeBufferButton, SIGNAL(clicked()),
1063                 this, SLOT(closeCurrentBuffer()));
1064         setCornerWidget(closeBufferButton, Qt::TopRightCorner);
1065
1066         QToolButton * closeTabButton = new QToolButton(this);
1067     closeTabButton->setPalette(pal);
1068         // FIXME: we need another icon for this.
1069         closeTabButton->setIcon(QIcon(":/images/closetab.png"));
1070         closeTabButton->setText("Minimize Buffer");
1071         closeTabButton->setAutoRaise(true);
1072         closeTabButton->setCursor(Qt::ArrowCursor);
1073         closeTabButton->setToolTip(tr("Close tab"));
1074         closeTabButton->setEnabled(true);
1075         QObject::connect(closeTabButton, SIGNAL(clicked()),
1076                 this, SLOT(closeCurrentTab()));
1077         setCornerWidget(closeTabButton, Qt::TopLeftCorner);
1078
1079         setUsesScrollButtons(true);
1080 }
1081
1082
1083 void TabWorkArea::setFullScreen(bool full_screen)
1084 {
1085         for (int i = 0; i != count(); ++i) {
1086                 if (GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i)))
1087                         wa->setFullScreen(full_screen);
1088         }
1089
1090         if (lyxrc.full_screen_tabbar)
1091                 showBar(!full_screen && count()>1);
1092 }
1093
1094
1095 void TabWorkArea::showBar(bool show)
1096 {
1097         tabBar()->setEnabled(show);
1098         tabBar()->setVisible(show);
1099 }
1100
1101
1102 GuiWorkArea * TabWorkArea::currentWorkArea()
1103 {
1104         if (count() == 0)
1105                 return 0;
1106
1107         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(currentWidget());
1108         BOOST_ASSERT(wa);
1109         return wa;
1110 }
1111
1112
1113 GuiWorkArea * TabWorkArea::workArea(Buffer & buffer)
1114 {
1115         for (int i = 0; i != count(); ++i) {
1116                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i));
1117                 BOOST_ASSERT(wa);
1118                 if (&wa->bufferView().buffer() == &buffer)
1119                         return wa;
1120         }
1121         return 0;
1122 }
1123
1124
1125 void TabWorkArea::closeAll()
1126 {
1127         while (count()) {
1128                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(0));
1129                 BOOST_ASSERT(wa);
1130                 removeTab(0);
1131                 delete wa;
1132         }
1133 }
1134
1135
1136 bool TabWorkArea::setCurrentWorkArea(GuiWorkArea * work_area)
1137 {
1138         BOOST_ASSERT(work_area);
1139         int index = indexOf(work_area);
1140         if (index == -1)
1141                 return false;
1142
1143         if (index == currentIndex())
1144                 // Make sure the work area is up to date.
1145                 on_currentTabChanged(index);
1146         else
1147                 // Switch to the work area.
1148                 setCurrentIndex(index);
1149         work_area->setFocus();
1150
1151         return true;
1152 }
1153
1154
1155 GuiWorkArea * TabWorkArea::addWorkArea(Buffer & buffer, GuiView & view)
1156 {
1157         GuiWorkArea * wa = new GuiWorkArea(buffer, view);
1158         wa->setUpdatesEnabled(false);
1159         // Hide tabbar if there's no tab (avoid a resize and a flashing tabbar
1160         // when hiding it again below).
1161         showBar(count() > 0);
1162         addTab(wa, wa->windowTitle());
1163         QObject::connect(wa, SIGNAL(titleChanged(GuiWorkArea *)),
1164                 this, SLOT(updateTabText(GuiWorkArea *)));
1165         // Hide tabbar if there's only one tab.
1166         showBar(count() > 1);
1167         return wa;
1168 }
1169
1170
1171 bool TabWorkArea::removeWorkArea(GuiWorkArea * work_area)
1172 {
1173         BOOST_ASSERT(work_area);
1174         int index = indexOf(work_area);
1175         if (index == -1)
1176                 return false;
1177
1178         work_area->setUpdatesEnabled(false);
1179         removeTab(index);
1180         delete work_area;
1181
1182         if (count()) {
1183                 // make sure the next work area is enabled.
1184                 currentWidget()->setUpdatesEnabled(true);
1185                 // Hide tabbar if there's only one tab.
1186                 showBar(count() > 1);
1187         }
1188         return true;
1189 }
1190
1191
1192 void TabWorkArea::on_currentTabChanged(int i)
1193 {
1194         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i));
1195         BOOST_ASSERT(wa);
1196         BufferView & bv = wa->bufferView();
1197         bv.cursor().fixIfBroken();
1198         bv.updateMetrics();
1199         wa->setUpdatesEnabled(true);
1200         wa->redraw();
1201         wa->setFocus();
1202         ///
1203         currentWorkAreaChanged(wa);
1204
1205         LYXERR(Debug::GUI, "currentTabChanged " << i
1206                 << "File" << bv.buffer().absFileName());
1207 }
1208
1209
1210 void TabWorkArea::closeCurrentBuffer()
1211 {
1212         lyx::dispatch(FuncRequest(LFUN_BUFFER_CLOSE));
1213 }
1214
1215
1216 void TabWorkArea::closeCurrentTab()
1217 {
1218         removeWorkArea(currentWorkArea());
1219 }
1220
1221
1222 void TabWorkArea::updateTabText(GuiWorkArea * wa)
1223 {
1224         int const i = indexOf(wa);
1225         if (i < 0)
1226                 return;
1227         setTabText(i, wa->windowTitle());
1228 }
1229
1230 } // namespace frontend
1231 } // namespace lyx
1232
1233 #include "GuiWorkArea_moc.cpp"