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