src/frontends/qt4/GuiWorkArea.cpp

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