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 "GuiApplication.h"
  17 #include "GuiPainter.h"
  18 #include "GuiKeySymbol.h"
  19 #include "qt_helpers.h"
  20
  21 #include "frontends/LyXView.h"
  22
  23 #include "Buffer.h"
  24 #include "BufferView.h"
  25 #include "Color.h"
  26 #include "Cursor.h"
  27 #include "debug.h"
  28 #include "FuncRequest.h"
  29 #include "LyXFunc.h"
  30 #include "LyXRC.h"
  31 #include "version.h"
  32
  33 #include "support/filetools.h" // LibFileSearch
  34
  35 #include "graphics/GraphicsImage.h"
  36 #include "graphics/GraphicsLoader.h"
  37
  38 #include <QInputContext>
  39 #include <QLayout>
  40 #include <QMainWindow>
  41 #include <QPainter>
  42 #include <QPushButton>
  43 #include <QScrollBar>
  44 #include <QTabBar>
  45 #include <QTimer>
  46
  47 #include <boost/bind.hpp>
  48 #include <boost/current_function.hpp>
  49
  50 #ifdef Q_WS_X11
  51 #include <QX11Info>
  52 extern "C" int XEventsQueued(Display *display, int mode);
  53 #endif
  54
  55 #ifdef Q_WS_WIN
  56 int const CursorWidth = 2;
  57 #else
  58 int const CursorWidth = 1;
  59 #endif
  60
  61 #undef KeyPress
  62 #undef NoModifier
  63
  64 using std::endl;
  65 using std::string;
  66
  67 namespace lyx {
  68
  69 using support::FileName;
  70
  71 /// return the LyX mouse button state from Qt's
  72 static mouse_button::state q_button_state(Qt::MouseButton button)
  73 {
  74         mouse_button::state b = mouse_button::none;
  75         switch (button) {
  76                 case Qt::LeftButton:
  77                         b = mouse_button::button1;
  78                         break;
  79                 case Qt::MidButton:
  80                         b = mouse_button::button2;
  81                         break;
  82                 case Qt::RightButton:
  83                         b = mouse_button::button3;
  84                         break;
  85                 default:
  86                         break;
  87         }
  88         return b;
  89 }
  90
  91
  92 /// return the LyX mouse button state from Qt's
  93 mouse_button::state q_motion_state(Qt::MouseButtons state)
  94 {
  95         mouse_button::state b = mouse_button::none;
  96         if (state & Qt::LeftButton)
  97                 b |= mouse_button::button1;
  98         if (state & Qt::MidButton)
  99                 b |= mouse_button::button2;
 100         if (state & Qt::RightButton)
 101                 b |= mouse_button::button3;
 102         return b;
 103 }
 104
 105
 106 namespace frontend {
 107
 108 class CursorWidget {
 109 public:
 110         CursorWidget() {}
 111
 112         void draw(QPainter & painter)
 113         {
 114                 if (show_ && rect_.isValid()) {
 115                         switch (shape_) {
 116                         case L_SHAPE:
 117                                 painter.fillRect(rect_.x(), rect_.y(), CursorWidth, rect_.height(), color_);
 118                                 painter.setPen(color_);
 119                                 painter.drawLine(rect_.bottomLeft().x() + CursorWidth, rect_.bottomLeft().y(),
 120                                                                                                  rect_.bottomRight().x(), rect_.bottomLeft().y());
 121                                 break;
 122
 123                         case REVERSED_L_SHAPE:
 124                                 painter.fillRect(rect_.x() + rect_.height() / 3, rect_.y(), CursorWidth, rect_.height(), color_);
 125                                 painter.setPen(color_);
 126                                 painter.drawLine(rect_.bottomRight().x() - CursorWidth, rect_.bottomLeft().y(),
 127                                                                                                          rect_.bottomLeft().x(), rect_.bottomLeft().y());
 128                                 break;
 129
 130                         default:
 131                                 painter.fillRect(rect_, color_);
 132                                 break;
 133                         }
 134                 }
 135         }
 136
 137         void update(int x, int y, int h, CursorShape shape)
 138         {
 139                 color_ = guiApp->colorCache().get(Color::cursor);
 140                 shape_ = shape;
 141                 switch (shape) {
 142                 case L_SHAPE:
 143                         rect_ = QRect(x, y, CursorWidth + h / 3, h);
 144                         break;
 145                 case REVERSED_L_SHAPE:
 146                         rect_ = QRect(x - h / 3, y, CursorWidth + h / 3, h);
 147                         break;
 148                 default:
 149                         rect_ = QRect(x, y, CursorWidth, h);
 150                         break;
 151                 }
 152         }
 153
 154         void show(bool set_show = true) { show_ = set_show; }
 155         void hide() { show_ = false; }
 156
 157         QRect const & rect() { return rect_; }
 158
 159 private:
 160         ///
 161         CursorShape shape_;
 162         ///
 163         bool show_;
 164         ///
 165         QColor color_;
 166         ///
 167         QRect rect_;
 168 };
 169
 170
 171 // This is a 'heartbeat' generating synthetic mouse move events when the
 172 // cursor is at the top or bottom edge of the viewport. One scroll per 0.2 s
 173 SyntheticMouseEvent::SyntheticMouseEvent()
 174         : timeout(200), restart_timeout(true),
 175           x_old(-1), y_old(-1), scrollbar_value_old(-1.0)
 176 {}
 177
 178
 179 GuiWorkArea::GuiWorkArea(Buffer & buf, LyXView & lv)
 180         : WorkArea(buf, lv), need_resize_(false), schedule_redraw_(false),
 181           preedit_lines_(1)
 182 {
 183         screen_ = QPixmap(viewport()->width(), viewport()->height());
 184         cursor_ = new frontend::CursorWidget();
 185         cursor_->hide();
 186
 187         setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
 188         setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 189         setAcceptDrops(true);
 190         setMouseTracking(true);
 191         setMinimumSize(100, 70);
 192
 193         viewport()->setAutoFillBackground(false);
 194         // We don't need double-buffering nor SystemBackground on
 195         // the viewport because we have our own backing pixmap.
 196         viewport()->setAttribute(Qt::WA_NoSystemBackground);
 197
 198         setFocusPolicy(Qt::WheelFocus);
 199
 200         viewport()->setCursor(Qt::IBeamCursor);
 201
 202         synthetic_mouse_event_.timeout.timeout.connect(
 203                 boost::bind(&GuiWorkArea::generateSyntheticMouseEvent,
 204                             this));
 205
 206         // Initialize the vertical Scroll Bar
 207         QObject::connect(verticalScrollBar(), SIGNAL(actionTriggered(int)),
 208                 this, SLOT(adjustViewWithScrollBar(int)));
 209
 210         // disable context menu for the scrollbar
 211         verticalScrollBar()->setContextMenuPolicy(Qt::NoContextMenu);
 212
 213         // PageStep only depends on the viewport height.
 214         verticalScrollBar()->setPageStep(viewport()->height());
 215
 216         LYXERR(Debug::GUI) << BOOST_CURRENT_FUNCTION
 217                 << "\n Area width\t" << width()
 218                 << "\n Area height\t" << height()
 219                 << "\n viewport width\t" << viewport()->width()
 220                 << "\n viewport height\t" << viewport()->height()
 221                 << endl;
 222
 223         // Enables input methods for asian languages.
 224         // Must be set when creating custom text editing widgets.
 225         setAttribute(Qt::WA_InputMethodEnabled, true);
 226 }
 227
 228
 229 void GuiWorkArea::setScrollbarParams(int h, int scroll_pos, int scroll_line_step)
 230 {
 231         if (verticalScrollBarPolicy() != Qt::ScrollBarAlwaysOn)
 232                 setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
 233
 234         verticalScrollBar()->setTracking(false);
 235
 236         // do what cursor movement does (some grey)
 237         h += height() / 4;
 238         int scroll_max_ = std::max(0, h - height());
 239
 240         verticalScrollBar()->setRange(0, scroll_max_);
 241         verticalScrollBar()->setSliderPosition(scroll_pos);
 242         verticalScrollBar()->setSingleStep(scroll_line_step);
 243         verticalScrollBar()->setValue(scroll_pos);
 244
 245         verticalScrollBar()->setTracking(true);
 246 }
 247
 248
 249 void GuiWorkArea::adjustViewWithScrollBar(int action)
 250 {
 251         stopBlinkingCursor();
 252         if (action == QAbstractSlider::SliderPageStepAdd)
 253                 buffer_view_->scrollDown(viewport()->height());
 254         else if (action == QAbstractSlider::SliderPageStepSub)
 255                 buffer_view_->scrollUp(viewport()->height());
 256         else
 257                 buffer_view_->scrollDocView(verticalScrollBar()->sliderPosition());
 258
 259         if (lyxrc.cursor_follows_scrollbar) {
 260                 buffer_view_->setCursorFromScrollbar();
 261                 lyx_view_->updateLayoutChoice();
 262         }
 263         // Show the cursor immediately after any operation.
 264         startBlinkingCursor();
 265         QApplication::syncX();
 266 }
 267
 268
 269 void GuiWorkArea::focusInEvent(QFocusEvent * /*event*/)
 270 {
 271         // Repaint the whole screen.
 272         // Note: this is different from redraw() as only the backing pixmap
 273         // will be redrawn, which is cheap.
 274         viewport()->repaint();
 275
 276         startBlinkingCursor();
 277 }
 278
 279
 280 void GuiWorkArea::focusOutEvent(QFocusEvent * /*event*/)
 281 {
 282         stopBlinkingCursor();
 283 }
 284
 285
 286 void GuiWorkArea::mousePressEvent(QMouseEvent * e)
 287 {
 288         if (dc_event_.active && dc_event_ == *e) {
 289                 dc_event_.active = false;
 290                 FuncRequest cmd(LFUN_MOUSE_TRIPLE,
 291                         e->x(), e->y(),
 292                         q_button_state(e->button()));
 293                 dispatch(cmd);
 294                 return;
 295         }
 296
 297         inputContext()->reset();
 298
 299         FuncRequest const cmd(LFUN_MOUSE_PRESS, e->x(), e->y(),
 300                 q_button_state(e->button()));
 301         dispatch(cmd, q_key_state(e->modifiers()));
 302 }
 303
 304
 305 void GuiWorkArea::mouseReleaseEvent(QMouseEvent * e)
 306 {
 307         if (synthetic_mouse_event_.timeout.running())
 308                 synthetic_mouse_event_.timeout.stop();
 309
 310         FuncRequest const cmd(LFUN_MOUSE_RELEASE, e->x(), e->y(),
 311                               q_button_state(e->button()));
 312         dispatch(cmd);
 313 }
 314
 315
 316 void GuiWorkArea::mouseMoveEvent(QMouseEvent * e)
 317 {
 318         // we kill the triple click if we move
 319         doubleClickTimeout();
 320         FuncRequest cmd(LFUN_MOUSE_MOTION, e->x(), e->y(),
 321                               q_motion_state(e->buttons()));
 322
 323         // If we're above or below the work area...
 324         if (e->y() <= 20 || e->y() >= viewport()->height() - 20) {
 325                 // Make sure only a synthetic event can cause a page scroll,
 326                 // so they come at a steady rate:
 327                 if (e->y() <= 20)
 328                         // _Force_ a scroll up:
 329                         cmd.y = -40;
 330                 else
 331                         cmd.y = viewport()->height();
 332                 // Store the event, to be handled when the timeout expires.
 333                 synthetic_mouse_event_.cmd = cmd;
 334
 335                 if (synthetic_mouse_event_.timeout.running())
 336                         // Discard the event. Note that it _may_ be handled
 337                         // when the timeout expires if
 338                         // synthetic_mouse_event_.cmd has not been overwritten.
 339                         // Ie, when the timeout expires, we handle the
 340                         // most recent event but discard all others that
 341                         // occurred after the one used to start the timeout
 342                         // in the first place.
 343                         return;
 344                 else {
 345                         synthetic_mouse_event_.restart_timeout = true;
 346                         synthetic_mouse_event_.timeout.start();
 347                         // Fall through to handle this event...
 348                 }
 349
 350         } else if (synthetic_mouse_event_.timeout.running()) {
 351                 // Store the event, to be possibly handled when the timeout
 352                 // expires.
 353                 // Once the timeout has expired, normal control is returned
 354                 // to mouseMoveEvent (restart_timeout = false).
 355                 // This results in a much smoother 'feel' when moving the
 356                 // mouse back into the work area.
 357                 synthetic_mouse_event_.cmd = cmd;
 358                 synthetic_mouse_event_.restart_timeout = false;
 359                 return;
 360         }
 361
 362         // Has anything changed on-screen since the last QMouseEvent
 363         // was received?
 364         double const scrollbar_value = verticalScrollBar()->value();
 365         if (e->x() != synthetic_mouse_event_.x_old ||
 366             e->y() != synthetic_mouse_event_.y_old ||
 367             scrollbar_value != synthetic_mouse_event_.scrollbar_value_old) {
 368                 // Yes it has. Store the params used to check this.
 369                 synthetic_mouse_event_.x_old = e->x();
 370                 synthetic_mouse_event_.y_old = e->y();
 371                 synthetic_mouse_event_.scrollbar_value_old = scrollbar_value;
 372
 373                 // ... and dispatch the event to the LyX core.
 374                 dispatch(cmd);
 375         }
 376 }
 377
 378
 379 void GuiWorkArea::wheelEvent(QWheelEvent * e)
 380 {
 381         // Wheel rotation by one notch results in a delta() of 120 (see
 382         // documentation of QWheelEvent)
 383         int const lines = qApp->wheelScrollLines() * e->delta() / 120;
 384         verticalScrollBar()->setValue(verticalScrollBar()->value() -
 385                         lines *  verticalScrollBar()->singleStep());
 386         adjustViewWithScrollBar();
 387 }
 388
 389
 390 void GuiWorkArea::generateSyntheticMouseEvent()
 391 {
 392 // Set things off to generate the _next_ 'pseudo' event.
 393         if (synthetic_mouse_event_.restart_timeout)
 394                 synthetic_mouse_event_.timeout.start();
 395
 396         // Has anything changed on-screen since the last timeout signal
 397         // was received?
 398         double const scrollbar_value = verticalScrollBar()->value();
 399         if (scrollbar_value != synthetic_mouse_event_.scrollbar_value_old) {
 400                 // Yes it has. Store the params used to check this.
 401                 synthetic_mouse_event_.scrollbar_value_old = scrollbar_value;
 402
 403                 // ... and dispatch the event to the LyX core.
 404                 dispatch(synthetic_mouse_event_.cmd);
 405         }
 406 }
 407
 408
 409 void GuiWorkArea::keyPressEvent(QKeyEvent * ev)
 410 {
 411         // do nothing if there are other events
 412         // (the auto repeated events come too fast)
 413         // \todo FIXME: remove hard coded Qt keys, process the key binding
 414 #ifdef Q_WS_X11
 415         if (XEventsQueued(QX11Info::display(), 0) > 1 && ev->isAutoRepeat()
 416                         && (Qt::Key_PageDown || Qt::Key_PageUp)) {
 417                 LYXERR(Debug::KEY)
 418                         << BOOST_CURRENT_FUNCTION << endl
 419                         << "system is busy: scroll key event ignored" << endl;
 420                 ev->ignore();
 421                 return;
 422         }
 423 #endif
 424
 425         LYXERR(Debug::KEY) << BOOST_CURRENT_FUNCTION
 426                 << " count=" << ev->count()
 427                 << " text=" << fromqstr(ev->text())
 428                 << " isAutoRepeat=" << ev->isAutoRepeat()
 429                 << " key=" << ev->key()
 430                 << endl;
 431
 432         KeySymbol sym;
 433         setKeySymbol(&sym, ev);
 434         processKeySym(sym, q_key_state(ev->modifiers()));
 435 }
 436
 437
 438 void GuiWorkArea::doubleClickTimeout()
 439 {
 440         dc_event_.active = false;
 441 }
 442
 443
 444 void GuiWorkArea::mouseDoubleClickEvent(QMouseEvent * ev)
 445 {
 446         dc_event_ = double_click(ev);
 447         QTimer::singleShot(QApplication::doubleClickInterval(), this,
 448                            SLOT(doubleClickTimeout()));
 449         FuncRequest cmd(LFUN_MOUSE_DOUBLE,
 450                         ev->x(), ev->y(),
 451                         q_button_state(ev->button()));
 452         dispatch(cmd);
 453 }
 454
 455
 456 void GuiWorkArea::resizeEvent(QResizeEvent * ev)
 457 {
 458         QAbstractScrollArea::resizeEvent(ev);
 459         need_resize_ = true;
 460 }
 461
 462
 463 void GuiWorkArea::update(int x, int y, int w, int h)
 464 {
 465         viewport()->repaint(x, y, w, h);
 466 }
 467
 468
 469 void GuiWorkArea::paintEvent(QPaintEvent * ev)
 470 {
 471         QRect const rc = ev->rect();
 472         /*
 473         LYXERR(Debug::PAINTING) << "paintEvent begin: x: " << rc.x()
 474                 << " y: " << rc.y()
 475                 << " w: " << rc.width()
 476                 << " h: " << rc.height() << endl;
 477         */
 478
 479         if (need_resize_) {
 480                 verticalScrollBar()->setPageStep(viewport()->height());
 481                 screen_ = QPixmap(viewport()->width(), viewport()->height());
 482                 resizeBufferView();
 483                 updateScreen();
 484                 WorkArea::hideCursor();
 485                 WorkArea::showCursor();
 486                 need_resize_ = false;
 487         }
 488
 489         QPainter pain(viewport());
 490         pain.drawPixmap(rc, screen_, rc);
 491         cursor_->draw(pain);
 492 }
 493
 494
 495 void GuiWorkArea::expose(int x, int y, int w, int h)
 496 {
 497         updateScreen();
 498         update(x, y, w, h);
 499 }
 500
 501
 502 void GuiWorkArea::updateScreen()
 503 {
 504         GuiPainter pain(&screen_);
 505         verticalScrollBar()->show();
 506         buffer_view_->draw(pain);
 507 }
 508
 509
 510 void GuiWorkArea::showCursor(int x, int y, int h, CursorShape shape)
 511 {
 512         if (schedule_redraw_) {
 513                 buffer_view_->updateMetrics(false);
 514                 updateScreen();
 515                 viewport()->update(QRect(0, 0, viewport()->width(), viewport()->height()));
 516                 schedule_redraw_ = false;
 517                 // Show the cursor immediately after the update.
 518                 hideCursor();
 519                 toggleCursor();
 520                 return;
 521         }
 522
 523         cursor_->update(x, y, h, shape);
 524         cursor_->show();
 525         viewport()->update(cursor_->rect());
 526 }
 527
 528
 529 void GuiWorkArea::removeCursor()
 530 {
 531         cursor_->hide();
 532         //if (!qApp->focusWidget())
 533                 viewport()->update(cursor_->rect());
 534 }
 535
 536
 537 void GuiWorkArea::inputMethodEvent(QInputMethodEvent * e)
 538 {
 539         QString const & commit_string = e->commitString();
 540         docstring const & preedit_string
 541                 = qstring_to_ucs4(e->preeditString());
 542
 543         if (!commit_string.isEmpty()) {
 544
 545                 LYXERR(Debug::KEY) << BOOST_CURRENT_FUNCTION
 546                         << " preeditString =" << fromqstr(e->preeditString())
 547                         << " commitString  =" << fromqstr(e->commitString())
 548                         << endl;
 549
 550                 int key = 0;
 551
 552                 // FIXME Iwami 04/01/07: we should take care also of UTF16 surrogates here.
 553                 for (int i = 0; i < commit_string.size(); ++i) {
 554                         QKeyEvent ev(QEvent::KeyPress, key, Qt::NoModifier, commit_string[i]);
 555                         keyPressEvent(&ev);
 556                 }
 557         }
 558
 559         // Hide the cursor during the kana-kanji transformation.
 560         if (preedit_string.empty())
 561                 startBlinkingCursor();
 562         else
 563                 stopBlinkingCursor();
 564
 565         // last_width : for checking if last preedit string was/wasn't empty.
 566         static bool last_width = false;
 567         if (!last_width && preedit_string.empty()) {
 568                 // if last_width is last length of preedit string.
 569                 e->accept();
 570                 return;
 571         }
 572
 573         GuiPainter pain(&screen_);
 574         buffer_view_->updateMetrics(false);
 575         buffer_view_->draw(pain);
 576         Font font = buffer_view_->cursor().getFont();
 577         FontMetrics const & fm = theFontMetrics(font);
 578         int height = fm.maxHeight();
 579         int cur_x = cursor_->rect().left();
 580         int cur_y = cursor_->rect().bottom();
 581
 582         // redraw area of preedit string.
 583         update(0, cur_y - height, GuiWorkArea::width(),
 584                 (height + 1) * preedit_lines_);
 585
 586         if (preedit_string.empty()) {
 587                 last_width = false;
 588                 preedit_lines_ = 1;
 589                 e->accept();
 590                 return;
 591         }
 592         last_width = true;
 593
 594         // att : stores an IM attribute.
 595         QList<QInputMethodEvent::Attribute> const & att = e->attributes();
 596
 597         // get attributes of input method cursor.
 598         // cursor_pos : cursor position in preedit string.
 599         size_t cursor_pos = 0;
 600         bool cursor_is_visible = false;
 601         for (int i = 0; i < att.size(); ++i) {
 602                 if (att.at(i).type == QInputMethodEvent::Cursor) {
 603                         cursor_pos = att.at(i).start;
 604                         cursor_is_visible = att.at(i).length != 0;
 605                         break;
 606                 }
 607         }
 608
 609         size_t preedit_length = preedit_string.length();
 610
 611         // get position of selection in input method.
 612         // FIXME: isn't there a way to do this simplier?
 613         // rStart : cursor position in selected string in IM.
 614         size_t rStart = 0;
 615         // rLength : selected string length in IM.
 616         size_t rLength = 0;
 617         if (cursor_pos < preedit_length) {
 618                 for (int i = 0; i < att.size(); ++i) {
 619                         if (att.at(i).type == QInputMethodEvent::TextFormat) {
 620                                 if (att.at(i).start <= int(cursor_pos)
 621                                         && int(cursor_pos) < att.at(i).start + att.at(i).length) {
 622                                                 rStart = att.at(i).start;
 623                                                 rLength = att.at(i).length;
 624                                                 if (!cursor_is_visible)
 625                                                         cursor_pos += rLength;
 626                                                 break;
 627                                 }
 628                         }
 629                 }
 630         }
 631         else {
 632                 rStart = cursor_pos;
 633                 rLength = 0;
 634         }
 635
 636         int const right_margin = rightMargin();
 637         Painter::preedit_style ps;
 638         // Most often there would be only one line:
 639         preedit_lines_ = 1;
 640         for (size_t pos = 0; pos != preedit_length; ++pos) {
 641                 char_type const typed_char = preedit_string[pos];
 642                 // reset preedit string style
 643                 ps = Painter::preedit_default;
 644
 645                 // if we reached the right extremity of the screen, go to next line.
 646                 if (cur_x + fm.width(typed_char) > GuiWorkArea::width() - right_margin) {
 647                         cur_x = right_margin;
 648                         cur_y += height + 1;
 649                         ++preedit_lines_;
 650                 }
 651                 // preedit strings are displayed with dashed underline
 652                 // and partial strings are displayed white on black indicating
 653                 // that we are in selecting mode in the input method.
 654                 // FIXME: rLength == preedit_length is not a changing condition
 655                 // FIXME: should be put out of the loop.
 656                 if (pos >= rStart
 657                         && pos < rStart + rLength
 658                         && !(cursor_pos < rLength && rLength == preedit_length))
 659                         ps = Painter::preedit_selecting;
 660
 661                 if (pos == cursor_pos
 662                         && (cursor_pos < rLength && rLength == preedit_length))
 663                         ps = Painter::preedit_cursor;
 664
 665                 // draw one character and update cur_x.
 666                 cur_x += pain.preeditText(cur_x, cur_y, typed_char, font, ps);
 667         }
 668
 669         // update the preedit string screen area.
 670         update(0, cur_y - preedit_lines_*height, GuiWorkArea::width(),
 671                 (height + 1) * preedit_lines_);
 672
 673         // Don't forget to accept the event!
 674         e->accept();
 675 }
 676
 677
 678 QVariant GuiWorkArea::inputMethodQuery(Qt::InputMethodQuery query) const
 679 {
 680         QRect cur_r(0,0,0,0);
 681         switch (query) {
 682                 // this is the CJK-specific composition window position.
 683                 case Qt::ImMicroFocus:
 684                         cur_r = cursor_->rect();
 685                         if (preedit_lines_ != 1)
 686                                 cur_r.moveLeft(10);
 687                         cur_r.moveBottom(cur_r.bottom() + cur_r.height() * preedit_lines_);
 688                         // return lower right of cursor in LyX.
 689                         return cur_r;
 690                 default:
 691                         return QWidget::inputMethodQuery(query);
 692         }
 693 }
 694
 695 ////////////////////////////////////////////////////////////////////
 696 // TabWorkArea implementation.
 697 ////////////////////////////////////////////////////////////////////
 698 TabWorkArea::TabWorkArea(QWidget * parent): QTabWidget(parent)
 699 {
 700         QPushButton * closeTabButton = new QPushButton(this);
 701         FileName const file = support::libFileSearch("images", "closetab", "png");
 702         if (!file.empty()) {
 703                 QPixmap pm(toqstr(file.absFilename()));
 704                 closeTabButton->setIcon(QIcon(pm));
 705                 closeTabButton->setMaximumSize(pm.size());
 706                 closeTabButton->setFlat(true);
 707         } else {
 708                 closeTabButton->setText("Close");
 709         }
 710         closeTabButton->setCursor(Qt::ArrowCursor);
 711         closeTabButton->setToolTip(tr("Close tab"));
 712         closeTabButton->setEnabled(true);
 713
 714         QObject::connect(this, SIGNAL(currentChanged(int)),
 715                 this, SLOT(on_currentTabChanged(int)));
 716         QObject::connect(closeTabButton, SIGNAL(clicked()),
 717                 this, SLOT(closeCurrentTab()));
 718
 719         setCornerWidget(closeTabButton);
 720 #if QT_VERSION >= 0x040200
 721         setUsesScrollButtons(true);
 722 #endif
 723 }
 724
 725
 726 void TabWorkArea::showBar(bool show)
 727 {
 728         tabBar()->setVisible(show);
 729 }
 730
 731
 732 void TabWorkArea::closeAll()
 733 {
 734         while (count()) {
 735                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(0));
 736                 BOOST_ASSERT(wa);
 737                 removeTab(0);
 738                 delete wa;
 739         }
 740 }
 741
 742
 743 bool TabWorkArea::setCurrentWorkArea(GuiWorkArea * work_area)
 744 {
 745         BOOST_ASSERT(work_area);
 746         int index = indexOf(work_area);
 747         if (index == -1)
 748                 return false;
 749
 750         if (index == currentIndex())
 751                 // Make sure the work area is up to date.
 752                 on_currentTabChanged(index);
 753         else
 754                 // Switch to the work area.
 755                 setCurrentIndex(index);
 756         work_area->setFocus();
 757
 758         return true;
 759 }
 760
 761
 762 bool TabWorkArea::removeWorkArea(GuiWorkArea * work_area)
 763 {
 764         BOOST_ASSERT(work_area);
 765         int index = indexOf(work_area);
 766         if (index == -1)
 767                 return false;
 768
 769         work_area->setUpdatesEnabled(false);
 770         removeTab(index);
 771         delete work_area;
 772
 773         if (count()) {
 774                 // make sure the next work area is enabled.
 775                 currentWidget()->setUpdatesEnabled(true);
 776                 // Hide tabbar if there's only one tab.
 777                 showBar(count() > 1);
 778         }
 779         return true;
 780 }
 781
 782
 783 void TabWorkArea::on_currentTabChanged(int i)
 784 {
 785         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i));
 786         BOOST_ASSERT(wa);
 787         BufferView & bv = wa->bufferView();
 788         bv.updateMetrics(false);
 789         bv.cursor().fixIfBroken();
 790         wa->setUpdatesEnabled(true);
 791         wa->redraw();
 792         wa->setFocus();
 793         ///
 794         currentWorkAreaChanged(wa);
 795
 796         LYXERR(Debug::GUI) << "currentTabChanged " << i
 797                 << "File" << bv.buffer().fileName() << endl;
 798 }
 799
 800
 801 void TabWorkArea::closeCurrentTab()
 802 {
 803         lyx::dispatch(FuncRequest(LFUN_BUFFER_CLOSE));
 804 }
 805
 806 } // namespace frontend
 807 } // namespace lyx
 808
 809 #include "GuiWorkArea_moc.cpp"