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 std::endl;
  74 using std::min;
  75 using std::max;
  76 using std::string;
  77
  78 namespace lyx {
  79
  80 using support::FileName;
  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         // disable context menu for the scrollbar
 235         verticalScrollBar()->setContextMenuPolicy(Qt::NoContextMenu);
 236
 237         // PageStep only depends on the viewport height.
 238         verticalScrollBar()->setPageStep(viewport()->height());
 239
 240         LYXERR(Debug::GUI, "viewport width: " << viewport()->width()
 241                 << "  viewport height: " << viewport()->height());
 242
 243         // Enables input methods for asian languages.
 244         // Must be set when creating custom text editing widgets.
 245         setAttribute(Qt::WA_InputMethodEnabled, true);
 246 }
 247
 248
 249
 250 GuiWorkArea::~GuiWorkArea()
 251 {
 252         buffer_view_->buffer().workAreaManager().remove(this);
 253         delete buffer_view_;
 254 }
 255
 256
 257 void GuiWorkArea::close()
 258 {
 259         lyx_view_->removeWorkArea(this);
 260 }
 261
 262
 263 BufferView & GuiWorkArea::bufferView()
 264 {
 265         return *buffer_view_;
 266 }
 267
 268
 269 BufferView const & GuiWorkArea::bufferView() const
 270 {
 271         return *buffer_view_;
 272 }
 273
 274
 275 void GuiWorkArea::stopBlinkingCursor()
 276 {
 277         cursor_timeout_.stop();
 278         hideCursor();
 279 }
 280
 281
 282 void GuiWorkArea::startBlinkingCursor()
 283 {
 284         showCursor();
 285         cursor_timeout_.start();
 286 }
 287
 288
 289 void GuiWorkArea::redraw()
 290 {
 291         if (!isVisible())
 292                 // No need to redraw in this case.
 293                 return;
 294
 295         // No need to do anything if this is the current view. The BufferView
 296         // metrics are already up to date.
 297         if (lyx_view_ != guiApp->currentView()) {
 298                 // FIXME: it would be nice to optimize for the off-screen case.
 299                 buffer_view_->updateMetrics();
 300                 buffer_view_->cursor().fixIfBroken();
 301         }
 302
 303         updateScrollbar();
 304
 305         // update cursor position, because otherwise it has to wait until
 306         // the blinking interval is over
 307         if (cursor_visible_) {
 308                 hideCursor();
 309                 showCursor();
 310         }
 311
 312         LYXERR(Debug::WORKAREA, "WorkArea::redraw screen");
 313         updateScreen();
 314         update(0, 0, viewport()->width(), viewport()->height());
 315
 316         lyx_view_->updateStatusBar();
 317
 318         if (lyxerr.debugging(Debug::WORKAREA))
 319                 buffer_view_->coordCache().dump();
 320 }
 321
 322
 323 void GuiWorkArea::processKeySym(KeySymbol const & key, KeyModifier mod)
 324 {
 325         // In order to avoid bad surprise in the middle of an operation,
 326         // we better stop the blinking cursor.
 327         stopBlinkingCursor();
 328
 329         theLyXFunc().setLyXView(lyx_view_);
 330         theLyXFunc().processKeySym(key, mod);
 331 }
 332
 333
 334 void GuiWorkArea::dispatch(FuncRequest const & cmd0, KeyModifier mod)
 335 {
 336         // Handle drag&drop
 337         if (cmd0.action == LFUN_FILE_OPEN) {
 338                 lyx_view_->dispatch(cmd0);
 339                 return;
 340         }
 341
 342         theLyXFunc().setLyXView(lyx_view_);
 343
 344         FuncRequest cmd;
 345
 346         if (cmd0.action == LFUN_MOUSE_PRESS) {
 347                 if (mod == ShiftModifier)
 348                         cmd = FuncRequest(cmd0, "region-select");
 349                 else if (mod == ControlModifier)
 350                         cmd = FuncRequest(cmd0, "paragraph-select");
 351                 else
 352                         cmd = cmd0;
 353         }
 354         else
 355                 cmd = cmd0;
 356
 357         // In order to avoid bad surprise in the middle of an operation, we better stop
 358         // the blinking cursor.
 359         if (!(cmd.action == LFUN_MOUSE_MOTION
 360                 && cmd.button() == mouse_button::none))
 361                 stopBlinkingCursor();
 362
 363         buffer_view_->mouseEventDispatch(cmd);
 364
 365         // Skip these when selecting
 366         if (cmd.action != LFUN_MOUSE_MOTION) {
 367                 lyx_view_->updateLayoutList();
 368                 lyx_view_->updateToolbars();
 369         }
 370
 371         // GUI tweaks except with mouse motion with no button pressed.
 372         if (!(cmd.action == LFUN_MOUSE_MOTION
 373                 && cmd.button() == mouse_button::none)) {
 374                 // Slight hack: this is only called currently when we
 375                 // clicked somewhere, so we force through the display
 376                 // of the new status here.
 377                 lyx_view_->clearMessage();
 378
 379                 // Show the cursor immediately after any operation.
 380                 startBlinkingCursor();
 381         }
 382 }
 383
 384
 385 void GuiWorkArea::resizeBufferView()
 386 {
 387         // WARNING: Please don't put any code that will trigger a repaint here!
 388         // We are already inside a paint event.
 389         lyx_view_->setBusy(true);
 390         buffer_view_->resize(viewport()->width(), viewport()->height());
 391         lyx_view_->updateLayoutList();
 392         lyx_view_->setBusy(false);
 393         need_resize_ = false;
 394 }
 395
 396
 397 void GuiWorkArea::showCursor()
 398 {
 399         if (cursor_visible_)
 400                 return;
 401
 402         CursorShape shape = BAR_SHAPE;
 403
 404         Font const & realfont = buffer_view_->cursor().real_current_font;
 405         BufferParams const & bp = buffer_view_->buffer().params();
 406         bool const samelang = realfont.language() == bp.language;
 407         bool const isrtl = realfont.isVisibleRightToLeft();
 408
 409         if (!samelang || isrtl != bp.language->rightToLeft()) {
 410                 shape = L_SHAPE;
 411                 if (isrtl)
 412                         shape = REVERSED_L_SHAPE;
 413         }
 414
 415         // The ERT language hack needs fixing up
 416         if (realfont.language() == latex_language)
 417                 shape = BAR_SHAPE;
 418
 419         Font const font = buffer_view_->cursor().getFont();
 420         FontMetrics const & fm = theFontMetrics(font);
 421         int const asc = fm.maxAscent();
 422         int const des = fm.maxDescent();
 423         int h = asc + des;
 424         int x = 0;
 425         int y = 0;
 426         buffer_view_->cursor().getPos(x, y);
 427         y -= asc;
 428
 429         // if it doesn't touch the screen, don't try to show it
 430         if (y + h < 0 || y >= viewport()->height())
 431                 return;
 432
 433         cursor_visible_ = true;
 434         showCursor(x, y, h, shape);
 435 }
 436
 437
 438 void GuiWorkArea::hideCursor()
 439 {
 440         if (!cursor_visible_)
 441                 return;
 442
 443         cursor_visible_ = false;
 444         removeCursor();
 445 }
 446
 447
 448 void GuiWorkArea::toggleCursor()
 449 {
 450         if (cursor_visible_)
 451                 hideCursor();
 452         else
 453                 showCursor();
 454
 455         // Use this opportunity to deal with any child processes that
 456         // have finished but are waiting to communicate this fact
 457         // to the rest of LyX.
 458         support::ForkedCallsController::handleCompletedProcesses();
 459 }
 460
 461
 462 void GuiWorkArea::updateScrollbar()
 463 {
 464         verticalScrollBar()->setTracking(false);
 465
 466         buffer_view_->updateScrollbar();
 467         ScrollbarParameters const & scroll_ = buffer_view_->scrollbarParameters();
 468
 469         // do what cursor movement does (some grey)
 470         int const h = scroll_.height + viewport()->height() / 4;
 471         int scroll_max_ = std::max(0, h - viewport()->height());
 472
 473         verticalScrollBar()->setRange(0, scroll_max_);
 474         verticalScrollBar()->setSliderPosition(scroll_.position);
 475         verticalScrollBar()->setSingleStep(scroll_.lineScrollHeight);
 476         verticalScrollBar()->setValue(scroll_.position);
 477
 478         verticalScrollBar()->setTracking(true);
 479 }
 480
 481
 482 void GuiWorkArea::adjustViewWithScrollBar(int action)
 483 {
 484         stopBlinkingCursor();
 485         if (action == QAbstractSlider::SliderPageStepAdd)
 486                 buffer_view_->scrollDown(viewport()->height());
 487         else if (action == QAbstractSlider::SliderPageStepSub)
 488                 buffer_view_->scrollUp(viewport()->height());
 489         else
 490                 buffer_view_->scrollDocView(verticalScrollBar()->sliderPosition());
 491
 492         if (lyxrc.cursor_follows_scrollbar) {
 493                 buffer_view_->setCursorFromScrollbar();
 494                 lyx_view_->updateLayoutList();
 495         }
 496         // Show the cursor immediately after any operation.
 497         startBlinkingCursor();
 498         QApplication::syncX();
 499 }
 500
 501
 502 void GuiWorkArea::focusInEvent(QFocusEvent * /*event*/)
 503 {
 504         // Repaint the whole screen.
 505         // Note: this is different from redraw() as only the backing pixmap
 506         // will be redrawn, which is cheap.
 507         viewport()->repaint();
 508
 509         startBlinkingCursor();
 510 }
 511
 512
 513 void GuiWorkArea::focusOutEvent(QFocusEvent * /*event*/)
 514 {
 515         stopBlinkingCursor();
 516 }
 517
 518
 519 void GuiWorkArea::mousePressEvent(QMouseEvent * e)
 520 {
 521         if (dc_event_.active && dc_event_ == *e) {
 522                 dc_event_.active = false;
 523                 FuncRequest cmd(LFUN_MOUSE_TRIPLE, e->x(), e->y(),
 524                         q_button_state(e->button()));
 525                 dispatch(cmd);
 526                 return;
 527         }
 528
 529         inputContext()->reset();
 530
 531         FuncRequest const cmd(LFUN_MOUSE_PRESS, e->x(), e->y(),
 532                 q_button_state(e->button()));
 533         dispatch(cmd, q_key_state(e->modifiers()));
 534 }
 535
 536
 537 void GuiWorkArea::mouseReleaseEvent(QMouseEvent * e)
 538 {
 539         if (synthetic_mouse_event_.timeout.running())
 540                 synthetic_mouse_event_.timeout.stop();
 541
 542         FuncRequest const cmd(LFUN_MOUSE_RELEASE, e->x(), e->y(),
 543                               q_button_state(e->button()));
 544         dispatch(cmd);
 545 }
 546
 547
 548 void GuiWorkArea::mouseMoveEvent(QMouseEvent * e)
 549 {
 550         // we kill the triple click if we move
 551         doubleClickTimeout();
 552         FuncRequest cmd(LFUN_MOUSE_MOTION, e->x(), e->y(),
 553                               q_motion_state(e->buttons()));
 554
 555         // If we're above or below the work area...
 556         if (e->y() <= 20 || e->y() >= viewport()->height() - 20) {
 557                 // Make sure only a synthetic event can cause a page scroll,
 558                 // so they come at a steady rate:
 559                 if (e->y() <= 20)
 560                         // _Force_ a scroll up:
 561                         cmd.y = -40;
 562                 else
 563                         cmd.y = viewport()->height();
 564                 // Store the event, to be handled when the timeout expires.
 565                 synthetic_mouse_event_.cmd = cmd;
 566
 567                 if (synthetic_mouse_event_.timeout.running())
 568                         // Discard the event. Note that it _may_ be handled
 569                         // when the timeout expires if
 570                         // synthetic_mouse_event_.cmd has not been overwritten.
 571                         // Ie, when the timeout expires, we handle the
 572                         // most recent event but discard all others that
 573                         // occurred after the one used to start the timeout
 574                         // in the first place.
 575                         return;
 576                 else {
 577                         synthetic_mouse_event_.restart_timeout = true;
 578                         synthetic_mouse_event_.timeout.start();
 579                         // Fall through to handle this event...
 580                 }
 581
 582         } else if (synthetic_mouse_event_.timeout.running()) {
 583                 // Store the event, to be possibly handled when the timeout
 584                 // expires.
 585                 // Once the timeout has expired, normal control is returned
 586                 // to mouseMoveEvent (restart_timeout = false).
 587                 // This results in a much smoother 'feel' when moving the
 588                 // mouse back into the work area.
 589                 synthetic_mouse_event_.cmd = cmd;
 590                 synthetic_mouse_event_.restart_timeout = false;
 591                 return;
 592         }
 593
 594         // Has anything changed on-screen since the last QMouseEvent
 595         // was received?
 596         double const scrollbar_value = verticalScrollBar()->value();
 597         if (e->x() != synthetic_mouse_event_.x_old ||
 598             e->y() != synthetic_mouse_event_.y_old ||
 599             scrollbar_value != synthetic_mouse_event_.scrollbar_value_old) {
 600                 // Yes it has. Store the params used to check this.
 601                 synthetic_mouse_event_.x_old = e->x();
 602                 synthetic_mouse_event_.y_old = e->y();
 603                 synthetic_mouse_event_.scrollbar_value_old = scrollbar_value;
 604
 605                 // ... and dispatch the event to the LyX core.
 606                 dispatch(cmd);
 607         }
 608 }
 609
 610
 611 void GuiWorkArea::wheelEvent(QWheelEvent * e)
 612 {
 613         // Wheel rotation by one notch results in a delta() of 120 (see
 614         // documentation of QWheelEvent)
 615         int const lines = qApp->wheelScrollLines() * e->delta() / 120;
 616         verticalScrollBar()->setValue(verticalScrollBar()->value() -
 617                         lines *  verticalScrollBar()->singleStep());
 618         adjustViewWithScrollBar();
 619 }
 620
 621
 622 void GuiWorkArea::generateSyntheticMouseEvent()
 623 {
 624 // Set things off to generate the _next_ 'pseudo' event.
 625         if (synthetic_mouse_event_.restart_timeout)
 626                 synthetic_mouse_event_.timeout.start();
 627
 628         // Has anything changed on-screen since the last timeout signal
 629         // was received?
 630         double const scrollbar_value = verticalScrollBar()->value();
 631         if (scrollbar_value != synthetic_mouse_event_.scrollbar_value_old) {
 632                 // Yes it has. Store the params used to check this.
 633                 synthetic_mouse_event_.scrollbar_value_old = scrollbar_value;
 634
 635                 // ... and dispatch the event to the LyX core.
 636                 dispatch(synthetic_mouse_event_.cmd);
 637         }
 638 }
 639
 640
 641 void GuiWorkArea::keyPressEvent(QKeyEvent * ev)
 642 {
 643         // do nothing if there are other events
 644         // (the auto repeated events come too fast)
 645         // \todo FIXME: remove hard coded Qt keys, process the key binding
 646 #ifdef Q_WS_X11
 647         if (XEventsQueued(QX11Info::display(), 0) > 1 && ev->isAutoRepeat()
 648                         && (Qt::Key_PageDown || Qt::Key_PageUp)) {
 649                 LYXERR(Debug::KEY, "system is busy: scroll key event ignored");
 650                 ev->ignore();
 651                 return;
 652         }
 653 #endif
 654
 655         LYXERR(Debug::KEY, " count: " << ev->count()
 656                 << " text: " << fromqstr(ev->text())
 657                 << " isAutoRepeat: " << ev->isAutoRepeat() << " key: " << ev->key());
 658
 659         KeySymbol sym;
 660         setKeySymbol(&sym, ev);
 661         processKeySym(sym, q_key_state(ev->modifiers()));
 662 }
 663
 664
 665 void GuiWorkArea::doubleClickTimeout()
 666 {
 667         dc_event_.active = false;
 668 }
 669
 670
 671 void GuiWorkArea::mouseDoubleClickEvent(QMouseEvent * ev)
 672 {
 673         dc_event_ = DoubleClick(ev);
 674         QTimer::singleShot(QApplication::doubleClickInterval(), this,
 675                            SLOT(doubleClickTimeout()));
 676         FuncRequest cmd(LFUN_MOUSE_DOUBLE,
 677                         ev->x(), ev->y(),
 678                         q_button_state(ev->button()));
 679         dispatch(cmd);
 680 }
 681
 682
 683 void GuiWorkArea::resizeEvent(QResizeEvent * ev)
 684 {
 685         QAbstractScrollArea::resizeEvent(ev);
 686         need_resize_ = true;
 687 }
 688
 689
 690 void GuiWorkArea::update(int x, int y, int w, int h)
 691 {
 692         viewport()->repaint(x, y, w, h);
 693 }
 694
 695
 696 void GuiWorkArea::paintEvent(QPaintEvent * ev)
 697 {
 698         QRect const rc = ev->rect();
 699         // LYXERR(Debug::PAINTING, "paintEvent begin: x: " << rc.x()
 700         //      << " y: " << rc.y() << " w: " << rc.width() << " h: " << rc.height());
 701
 702         if (need_resize_) {
 703                 verticalScrollBar()->setPageStep(viewport()->height());
 704                 screen_ = QPixmap(viewport()->width(), viewport()->height());
 705                 resizeBufferView();
 706                 updateScreen();
 707                 hideCursor();
 708                 showCursor();
 709         }
 710
 711         QPainter pain(viewport());
 712         pain.drawPixmap(rc, screen_, rc);
 713         cursor_->draw(pain);
 714 }
 715
 716
 717 void GuiWorkArea::updateScreen()
 718 {
 719         GuiPainter pain(&screen_);
 720         buffer_view_->draw(pain);
 721 }
 722
 723
 724 void GuiWorkArea::showCursor(int x, int y, int h, CursorShape shape)
 725 {
 726         if (schedule_redraw_) {
 727                 buffer_view_->updateMetrics();
 728                 updateScreen();
 729                 viewport()->update(QRect(0, 0, viewport()->width(), viewport()->height()));
 730                 schedule_redraw_ = false;
 731                 // Show the cursor immediately after the update.
 732                 hideCursor();
 733                 toggleCursor();
 734                 return;
 735         }
 736
 737         cursor_->update(x, y, h, shape);
 738         cursor_->show();
 739         viewport()->update(cursor_->rect());
 740 }
 741
 742
 743 void GuiWorkArea::removeCursor()
 744 {
 745         cursor_->hide();
 746         //if (!qApp->focusWidget())
 747                 viewport()->update(cursor_->rect());
 748 }
 749
 750
 751 void GuiWorkArea::inputMethodEvent(QInputMethodEvent * e)
 752 {
 753         QString const & commit_string = e->commitString();
 754         docstring const & preedit_string
 755                 = qstring_to_ucs4(e->preeditString());
 756
 757         if (!commit_string.isEmpty()) {
 758
 759                 LYXERR(Debug::KEY, "preeditString: " << fromqstr(e->preeditString())
 760                         << " commitString: " << fromqstr(e->commitString()));
 761
 762                 int key = 0;
 763
 764                 // FIXME Iwami 04/01/07: we should take care also of UTF16 surrogates here.
 765                 for (int i = 0; i != commit_string.size(); ++i) {
 766                         QKeyEvent ev(QEvent::KeyPress, key, Qt::NoModifier, commit_string[i]);
 767                         keyPressEvent(&ev);
 768                 }
 769         }
 770
 771         // Hide the cursor during the kana-kanji transformation.
 772         if (preedit_string.empty())
 773                 startBlinkingCursor();
 774         else
 775                 stopBlinkingCursor();
 776
 777         // last_width : for checking if last preedit string was/wasn't empty.
 778         static bool last_width = false;
 779         if (!last_width && preedit_string.empty()) {
 780                 // if last_width is last length of preedit string.
 781                 e->accept();
 782                 return;
 783         }
 784
 785         GuiPainter pain(&screen_);
 786         buffer_view_->updateMetrics();
 787         buffer_view_->draw(pain);
 788         FontInfo font = buffer_view_->cursor().getFont().fontInfo();
 789         FontMetrics const & fm = theFontMetrics(font);
 790         int height = fm.maxHeight();
 791         int cur_x = cursor_->rect().left();
 792         int cur_y = cursor_->rect().bottom();
 793
 794         // redraw area of preedit string.
 795         update(0, cur_y - height, viewport()->width(),
 796                 (height + 1) * preedit_lines_);
 797
 798         if (preedit_string.empty()) {
 799                 last_width = false;
 800                 preedit_lines_ = 1;
 801                 e->accept();
 802                 return;
 803         }
 804         last_width = true;
 805
 806         // att : stores an IM attribute.
 807         QList<QInputMethodEvent::Attribute> const & att = e->attributes();
 808
 809         // get attributes of input method cursor.
 810         // cursor_pos : cursor position in preedit string.
 811         size_t cursor_pos = 0;
 812         bool cursor_is_visible = false;
 813         for (int i = 0; i != att.size(); ++i) {
 814                 if (att.at(i).type == QInputMethodEvent::Cursor) {
 815                         cursor_pos = att.at(i).start;
 816                         cursor_is_visible = att.at(i).length != 0;
 817                         break;
 818                 }
 819         }
 820
 821         size_t preedit_length = preedit_string.length();
 822
 823         // get position of selection in input method.
 824         // FIXME: isn't there a way to do this simplier?
 825         // rStart : cursor position in selected string in IM.
 826         size_t rStart = 0;
 827         // rLength : selected string length in IM.
 828         size_t rLength = 0;
 829         if (cursor_pos < preedit_length) {
 830                 for (int i = 0; i != att.size(); ++i) {
 831                         if (att.at(i).type == QInputMethodEvent::TextFormat) {
 832                                 if (att.at(i).start <= int(cursor_pos)
 833                                         && int(cursor_pos) < att.at(i).start + att.at(i).length) {
 834                                                 rStart = att.at(i).start;
 835                                                 rLength = att.at(i).length;
 836                                                 if (!cursor_is_visible)
 837                                                         cursor_pos += rLength;
 838                                                 break;
 839                                 }
 840                         }
 841                 }
 842         }
 843         else {
 844                 rStart = cursor_pos;
 845                 rLength = 0;
 846         }
 847
 848         int const right_margin = rightMargin();
 849         Painter::preedit_style ps;
 850         // Most often there would be only one line:
 851         preedit_lines_ = 1;
 852         for (size_t pos = 0; pos != preedit_length; ++pos) {
 853                 char_type const typed_char = preedit_string[pos];
 854                 // reset preedit string style
 855                 ps = Painter::preedit_default;
 856
 857                 // if we reached the right extremity of the screen, go to next line.
 858                 if (cur_x + fm.width(typed_char) > viewport()->width() - right_margin) {
 859                         cur_x = right_margin;
 860                         cur_y += height + 1;
 861                         ++preedit_lines_;
 862                 }
 863                 // preedit strings are displayed with dashed underline
 864                 // and partial strings are displayed white on black indicating
 865                 // that we are in selecting mode in the input method.
 866                 // FIXME: rLength == preedit_length is not a changing condition
 867                 // FIXME: should be put out of the loop.
 868                 if (pos >= rStart
 869                         && pos < rStart + rLength
 870                         && !(cursor_pos < rLength && rLength == preedit_length))
 871                         ps = Painter::preedit_selecting;
 872
 873                 if (pos == cursor_pos
 874                         && (cursor_pos < rLength && rLength == preedit_length))
 875                         ps = Painter::preedit_cursor;
 876
 877                 // draw one character and update cur_x.
 878                 cur_x += pain.preeditText(cur_x, cur_y, typed_char, font, ps);
 879         }
 880
 881         // update the preedit string screen area.
 882         update(0, cur_y - preedit_lines_*height, viewport()->width(),
 883                 (height + 1) * preedit_lines_);
 884
 885         // Don't forget to accept the event!
 886         e->accept();
 887 }
 888
 889
 890 QVariant GuiWorkArea::inputMethodQuery(Qt::InputMethodQuery query) const
 891 {
 892         QRect cur_r(0,0,0,0);
 893         switch (query) {
 894                 // this is the CJK-specific composition window position.
 895                 case Qt::ImMicroFocus:
 896                         cur_r = cursor_->rect();
 897                         if (preedit_lines_ != 1)
 898                                 cur_r.moveLeft(10);
 899                         cur_r.moveBottom(cur_r.bottom() + cur_r.height() * preedit_lines_);
 900                         // return lower right of cursor in LyX.
 901                         return cur_r;
 902                 default:
 903                         return QWidget::inputMethodQuery(query);
 904         }
 905 }
 906
 907
 908 void GuiWorkArea::updateWindowTitle()
 909 {
 910         docstring maximize_title;
 911         docstring minimize_title;
 912
 913         Buffer & buf = buffer_view_->buffer();
 914         FileName const fileName = buf.fileName();
 915         if (!fileName.empty()) {
 916                 maximize_title = fileName.displayName(30);
 917                 minimize_title = from_utf8(fileName.onlyFileName());
 918                 if (!buf.isClean()) {
 919                         maximize_title += _(" (changed)");
 920                         minimize_title += char_type('*');
 921                 }
 922                 if (buf.isReadonly())
 923                         maximize_title += _(" (read only)");
 924         }
 925
 926         QString title = windowTitle();
 927         QString new_title = toqstr(maximize_title);
 928         if (title == new_title)
 929                 return;
 930
 931         QWidget::setWindowTitle(new_title);
 932         QWidget::setWindowIconText(toqstr(minimize_title));
 933         titleChanged(this);
 934 }
 935
 936
 937 void GuiWorkArea::setReadOnly(bool)
 938 {
 939         updateWindowTitle();
 940         if (this == lyx_view_->currentWorkArea())
 941                 lyx_view_->updateBufferDependent(false);
 942 }
 943
 944
 945 ////////////////////////////////////////////////////////////////////
 946 //
 947 // TabWorkArea
 948 //
 949 ////////////////////////////////////////////////////////////////////
 950
 951 TabWorkArea::TabWorkArea(QWidget * parent) : QTabWidget(parent)
 952 {
 953         QPalette pal = palette();
 954         pal.setColor(QPalette::Active, QPalette::Button,
 955                 pal.color(QPalette::Active, QPalette::Window));
 956         pal.setColor(QPalette::Disabled, QPalette::Button,
 957                 pal.color(QPalette::Disabled, QPalette::Window));
 958         pal.setColor(QPalette::Inactive, QPalette::Button,
 959                 pal.color(QPalette::Inactive, QPalette::Window));
 960
 961         QToolButton * closeTabButton = new QToolButton(this);
 962     closeTabButton->setPalette(pal);
 963         closeTabButton->setIcon(QIcon(":/images/closetab.png"));
 964         closeTabButton->setText("Close");
 965         closeTabButton->setAutoRaise(true);
 966         closeTabButton->setCursor(Qt::ArrowCursor);
 967         closeTabButton->setToolTip(tr("Close tab"));
 968         closeTabButton->setEnabled(true);
 969
 970         QObject::connect(this, SIGNAL(currentChanged(int)),
 971                 this, SLOT(on_currentTabChanged(int)));
 972         QObject::connect(closeTabButton, SIGNAL(clicked()),
 973                 this, SLOT(closeCurrentTab()));
 974
 975         setCornerWidget(closeTabButton);
 976         setUsesScrollButtons(true);
 977 }
 978
 979
 980 void TabWorkArea::showBar(bool show)
 981 {
 982         tabBar()->setEnabled(show);
 983         tabBar()->setVisible(show);
 984 }
 985
 986
 987 GuiWorkArea * TabWorkArea::currentWorkArea()
 988 {
 989         if (count() == 0)
 990                 return 0;
 991
 992         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(currentWidget());
 993         BOOST_ASSERT(wa);
 994         return wa;
 995 }
 996
 997
 998 GuiWorkArea * TabWorkArea::workArea(Buffer & buffer)
 999 {
1000         for (int i = 0; i != count(); ++i) {
1001                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i));
1002                 BOOST_ASSERT(wa);
1003                 if (&wa->bufferView().buffer() == &buffer)
1004                         return wa;
1005         }
1006         return 0;
1007 }
1008
1009
1010 void TabWorkArea::closeAll()
1011 {
1012         while (count()) {
1013                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(0));
1014                 BOOST_ASSERT(wa);
1015                 removeTab(0);
1016                 delete wa;
1017         }
1018 }
1019
1020
1021 bool TabWorkArea::setCurrentWorkArea(GuiWorkArea * work_area)
1022 {
1023         BOOST_ASSERT(work_area);
1024         int index = indexOf(work_area);
1025         if (index == -1)
1026                 return false;
1027
1028         if (index == currentIndex())
1029                 // Make sure the work area is up to date.
1030                 on_currentTabChanged(index);
1031         else
1032                 // Switch to the work area.
1033                 setCurrentIndex(index);
1034         work_area->setFocus();
1035
1036         return true;
1037 }
1038
1039
1040 GuiWorkArea * TabWorkArea::addWorkArea(Buffer & buffer, GuiView & view)
1041 {
1042         GuiWorkArea * wa = new GuiWorkArea(buffer, view);
1043         wa->setUpdatesEnabled(false);
1044         // Hide tabbar if there's no tab (avoid a resize and a flashing tabbar
1045         // when hiding it again below).
1046         showBar(count() > 0);
1047         addTab(wa, wa->windowTitle());
1048         QObject::connect(wa, SIGNAL(titleChanged(GuiWorkArea *)),
1049                 this, SLOT(updateTabText(GuiWorkArea *)));
1050         // Hide tabbar if there's only one tab.
1051         showBar(count() > 1);
1052         return wa;
1053 }
1054
1055
1056 bool TabWorkArea::removeWorkArea(GuiWorkArea * work_area)
1057 {
1058         BOOST_ASSERT(work_area);
1059         int index = indexOf(work_area);
1060         if (index == -1)
1061                 return false;
1062
1063         work_area->setUpdatesEnabled(false);
1064         removeTab(index);
1065         delete work_area;
1066
1067         if (count()) {
1068                 // make sure the next work area is enabled.
1069                 currentWidget()->setUpdatesEnabled(true);
1070                 // Hide tabbar if there's only one tab.
1071                 showBar(count() > 1);
1072         }
1073         return true;
1074 }
1075
1076
1077 void TabWorkArea::on_currentTabChanged(int i)
1078 {
1079         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i));
1080         BOOST_ASSERT(wa);
1081         BufferView & bv = wa->bufferView();
1082         bv.cursor().fixIfBroken();
1083         bv.updateMetrics();
1084         wa->setUpdatesEnabled(true);
1085         wa->redraw();
1086         wa->setFocus();
1087         ///
1088         currentWorkAreaChanged(wa);
1089
1090         LYXERR(Debug::GUI, "currentTabChanged " << i
1091                 << "File" << bv.buffer().absFileName());
1092 }
1093
1094
1095 void TabWorkArea::closeCurrentTab()
1096 {
1097         lyx::dispatch(FuncRequest(LFUN_BUFFER_CLOSE));
1098 }
1099
1100
1101 void TabWorkArea::updateTabText(GuiWorkArea * wa)
1102 {
1103         int const i = indexOf(wa);
1104         if (i < 0)
1105                 return;
1106         setTabText(i, wa->windowTitle());
1107 }
1108
1109 } // namespace frontend
1110 } // namespace lyx
1111
1112 #include "GuiWorkArea_moc.cpp"