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 <QToolButton>
  43 #include <QPalette>
  44 #include <QScrollBar>
  45 #include <QTabBar>
  46 #include <QTimer>
  47
  48 #include <boost/bind.hpp>
  49 #include <boost/current_function.hpp>
  50
  51 #ifdef Q_WS_X11
  52 #include <QX11Info>
  53 extern "C" int XEventsQueued(Display *display, int mode);
  54 #endif
  55
  56 #ifdef Q_WS_WIN
  57 int const CursorWidth = 2;
  58 #else
  59 int const CursorWidth = 1;
  60 #endif
  61
  62 #undef KeyPress
  63 #undef NoModifier
  64
  65 using std::endl;
  66 using std::string;
  67
  68 namespace lyx {
  69
  70 using support::FileName;
  71
  72 /// return the LyX mouse button state from Qt's
  73 static mouse_button::state q_button_state(Qt::MouseButton button)
  74 {
  75         mouse_button::state b = mouse_button::none;
  76         switch (button) {
  77                 case Qt::LeftButton:
  78                         b = mouse_button::button1;
  79                         break;
  80                 case Qt::MidButton:
  81                         b = mouse_button::button2;
  82                         break;
  83                 case Qt::RightButton:
  84                         b = mouse_button::button3;
  85                         break;
  86                 default:
  87                         break;
  88         }
  89         return b;
  90 }
  91
  92
  93 /// return the LyX mouse button state from Qt's
  94 mouse_button::state q_motion_state(Qt::MouseButtons state)
  95 {
  96         mouse_button::state b = mouse_button::none;
  97         if (state & Qt::LeftButton)
  98                 b |= mouse_button::button1;
  99         if (state & Qt::MidButton)
 100                 b |= mouse_button::button2;
 101         if (state & Qt::RightButton)
 102                 b |= mouse_button::button3;
 103         return b;
 104 }
 105
 106
 107 namespace frontend {
 108
 109 class CursorWidget {
 110 public:
 111         CursorWidget() {}
 112
 113         void draw(QPainter & painter)
 114         {
 115                 if (show_ && rect_.isValid()) {
 116                         switch (shape_) {
 117                         case L_SHAPE:
 118                                 painter.fillRect(rect_.x(), rect_.y(), CursorWidth, rect_.height(), color_);
 119                                 painter.setPen(color_);
 120                                 painter.drawLine(rect_.bottomLeft().x() + CursorWidth, rect_.bottomLeft().y(),
 121                                                                                                  rect_.bottomRight().x(), rect_.bottomLeft().y());
 122                                 break;
 123
 124                         case REVERSED_L_SHAPE:
 125                                 painter.fillRect(rect_.x() + rect_.height() / 3, rect_.y(), CursorWidth, rect_.height(), color_);
 126                                 painter.setPen(color_);
 127                                 painter.drawLine(rect_.bottomRight().x() - CursorWidth, rect_.bottomLeft().y(),
 128                                                                                                          rect_.bottomLeft().x(), rect_.bottomLeft().y());
 129                                 break;
 130
 131                         default:
 132                                 painter.fillRect(rect_, color_);
 133                                 break;
 134                         }
 135                 }
 136         }
 137
 138         void update(int x, int y, int h, CursorShape shape)
 139         {
 140                 color_ = guiApp->colorCache().get(Color::cursor);
 141                 shape_ = shape;
 142                 switch (shape) {
 143                 case L_SHAPE:
 144                         rect_ = QRect(x, y, CursorWidth + h / 3, h);
 145                         break;
 146                 case REVERSED_L_SHAPE:
 147                         rect_ = QRect(x - h / 3, y, CursorWidth + h / 3, h);
 148                         break;
 149                 default:
 150                         rect_ = QRect(x, y, CursorWidth, h);
 151                         break;
 152                 }
 153         }
 154
 155         void show(bool set_show = true) { show_ = set_show; }
 156         void hide() { show_ = false; }
 157
 158         QRect const & rect() { return rect_; }
 159
 160 private:
 161         ///
 162         CursorShape shape_;
 163         ///
 164         bool show_;
 165         ///
 166         QColor color_;
 167         ///
 168         QRect rect_;
 169 };
 170
 171
 172 // This is a 'heartbeat' generating synthetic mouse move events when the
 173 // cursor is at the top or bottom edge of the viewport. One scroll per 0.2 s
 174 SyntheticMouseEvent::SyntheticMouseEvent()
 175         : timeout(200), restart_timeout(true),
 176           x_old(-1), y_old(-1), scrollbar_value_old(-1.0)
 177 {}
 178
 179
 180 GuiWorkArea::GuiWorkArea(Buffer & buf, LyXView & lv)
 181         : WorkArea(buf, lv), need_resize_(false), schedule_redraw_(false),
 182           preedit_lines_(1)
 183 {
 184         screen_ = QPixmap(viewport()->width(), viewport()->height());
 185         cursor_ = new frontend::CursorWidget();
 186         cursor_->hide();
 187
 188         setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
 189         setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 190         setAcceptDrops(true);
 191         setMouseTracking(true);
 192         setMinimumSize(100, 70);
 193
 194         viewport()->setAutoFillBackground(false);
 195         // We don't need double-buffering nor SystemBackground on
 196         // the viewport because we have our own backing pixmap.
 197         viewport()->setAttribute(Qt::WA_NoSystemBackground);
 198
 199         setFocusPolicy(Qt::WheelFocus);
 200
 201         viewport()->setCursor(Qt::IBeamCursor);
 202
 203         synthetic_mouse_event_.timeout.timeout.connect(
 204                 boost::bind(&GuiWorkArea::generateSyntheticMouseEvent,
 205                             this));
 206
 207         // Initialize the vertical Scroll Bar
 208         QObject::connect(verticalScrollBar(), SIGNAL(actionTriggered(int)),
 209                 this, SLOT(adjustViewWithScrollBar(int)));
 210
 211         // disable context menu for the scrollbar
 212         verticalScrollBar()->setContextMenuPolicy(Qt::NoContextMenu);
 213
 214         // PageStep only depends on the viewport height.
 215         verticalScrollBar()->setPageStep(viewport()->height());
 216
 217         LYXERR(Debug::GUI) << BOOST_CURRENT_FUNCTION
 218                 << "\n Area width\t" << width()
 219                 << "\n Area height\t" << height()
 220                 << "\n viewport width\t" << viewport()->width()
 221                 << "\n viewport height\t" << viewport()->height()
 222                 << endl;
 223
 224         // Enables input methods for asian languages.
 225         // Must be set when creating custom text editing widgets.
 226         setAttribute(Qt::WA_InputMethodEnabled, true);
 227 }
 228
 229
 230 void GuiWorkArea::setScrollbarParams(int h, int scroll_pos, int scroll_line_step)
 231 {
 232         if (verticalScrollBarPolicy() != Qt::ScrollBarAlwaysOn)
 233                 setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
 234
 235         verticalScrollBar()->setTracking(false);
 236
 237         // do what cursor movement does (some grey)
 238         h += height() / 4;
 239         int scroll_max_ = std::max(0, h - height());
 240
 241         verticalScrollBar()->setRange(0, scroll_max_);
 242         verticalScrollBar()->setSliderPosition(scroll_pos);
 243         verticalScrollBar()->setSingleStep(scroll_line_step);
 244         verticalScrollBar()->setValue(scroll_pos);
 245
 246         verticalScrollBar()->setTracking(true);
 247 }
 248
 249
 250 void GuiWorkArea::adjustViewWithScrollBar(int action)
 251 {
 252         stopBlinkingCursor();
 253         if (action == QAbstractSlider::SliderPageStepAdd)
 254                 buffer_view_->scrollDown(viewport()->height());
 255         else if (action == QAbstractSlider::SliderPageStepSub)
 256                 buffer_view_->scrollUp(viewport()->height());
 257         else
 258                 buffer_view_->scrollDocView(verticalScrollBar()->sliderPosition());
 259
 260         if (lyxrc.cursor_follows_scrollbar) {
 261                 buffer_view_->setCursorFromScrollbar();
 262                 lyx_view_->updateLayoutChoice();
 263         }
 264         // Show the cursor immediately after any operation.
 265         startBlinkingCursor();
 266         QApplication::syncX();
 267 }
 268
 269
 270 void GuiWorkArea::focusInEvent(QFocusEvent * /*event*/)
 271 {
 272         // Repaint the whole screen.
 273         // Note: this is different from redraw() as only the backing pixmap
 274         // will be redrawn, which is cheap.
 275         viewport()->repaint();
 276
 277         startBlinkingCursor();
 278 }
 279
 280
 281 void GuiWorkArea::focusOutEvent(QFocusEvent * /*event*/)
 282 {
 283         stopBlinkingCursor();
 284 }
 285
 286
 287 void GuiWorkArea::mousePressEvent(QMouseEvent * e)
 288 {
 289         if (dc_event_.active && dc_event_ == *e) {
 290                 dc_event_.active = false;
 291                 FuncRequest cmd(LFUN_MOUSE_TRIPLE,
 292                         e->x(), e->y(),
 293                         q_button_state(e->button()));
 294                 dispatch(cmd);
 295                 return;
 296         }
 297
 298         inputContext()->reset();
 299
 300         FuncRequest const cmd(LFUN_MOUSE_PRESS, e->x(), e->y(),
 301                 q_button_state(e->button()));
 302         dispatch(cmd, q_key_state(e->modifiers()));
 303 }
 304
 305
 306 void GuiWorkArea::mouseReleaseEvent(QMouseEvent * e)
 307 {
 308         if (synthetic_mouse_event_.timeout.running())
 309                 synthetic_mouse_event_.timeout.stop();
 310
 311         FuncRequest const cmd(LFUN_MOUSE_RELEASE, e->x(), e->y(),
 312                               q_button_state(e->button()));
 313         dispatch(cmd);
 314 }
 315
 316
 317 void GuiWorkArea::mouseMoveEvent(QMouseEvent * e)
 318 {
 319         // we kill the triple click if we move
 320         doubleClickTimeout();
 321         FuncRequest cmd(LFUN_MOUSE_MOTION, e->x(), e->y(),
 322                               q_motion_state(e->buttons()));
 323
 324         // If we're above or below the work area...
 325         if (e->y() <= 20 || e->y() >= viewport()->height() - 20) {
 326                 // Make sure only a synthetic event can cause a page scroll,
 327                 // so they come at a steady rate:
 328                 if (e->y() <= 20)
 329                         // _Force_ a scroll up:
 330                         cmd.y = -40;
 331                 else
 332                         cmd.y = viewport()->height();
 333                 // Store the event, to be handled when the timeout expires.
 334                 synthetic_mouse_event_.cmd = cmd;
 335
 336                 if (synthetic_mouse_event_.timeout.running())
 337                         // Discard the event. Note that it _may_ be handled
 338                         // when the timeout expires if
 339                         // synthetic_mouse_event_.cmd has not been overwritten.
 340                         // Ie, when the timeout expires, we handle the
 341                         // most recent event but discard all others that
 342                         // occurred after the one used to start the timeout
 343                         // in the first place.
 344                         return;
 345                 else {
 346                         synthetic_mouse_event_.restart_timeout = true;
 347                         synthetic_mouse_event_.timeout.start();
 348                         // Fall through to handle this event...
 349                 }
 350
 351         } else if (synthetic_mouse_event_.timeout.running()) {
 352                 // Store the event, to be possibly handled when the timeout
 353                 // expires.
 354                 // Once the timeout has expired, normal control is returned
 355                 // to mouseMoveEvent (restart_timeout = false).
 356                 // This results in a much smoother 'feel' when moving the
 357                 // mouse back into the work area.
 358                 synthetic_mouse_event_.cmd = cmd;
 359                 synthetic_mouse_event_.restart_timeout = false;
 360                 return;
 361         }
 362
 363         // Has anything changed on-screen since the last QMouseEvent
 364         // was received?
 365         double const scrollbar_value = verticalScrollBar()->value();
 366         if (e->x() != synthetic_mouse_event_.x_old ||
 367             e->y() != synthetic_mouse_event_.y_old ||
 368             scrollbar_value != synthetic_mouse_event_.scrollbar_value_old) {
 369                 // Yes it has. Store the params used to check this.
 370                 synthetic_mouse_event_.x_old = e->x();
 371                 synthetic_mouse_event_.y_old = e->y();
 372                 synthetic_mouse_event_.scrollbar_value_old = scrollbar_value;
 373
 374                 // ... and dispatch the event to the LyX core.
 375                 dispatch(cmd);
 376         }
 377 }
 378
 379
 380 void GuiWorkArea::wheelEvent(QWheelEvent * e)
 381 {
 382         // Wheel rotation by one notch results in a delta() of 120 (see
 383         // documentation of QWheelEvent)
 384         int const lines = qApp->wheelScrollLines() * e->delta() / 120;
 385         verticalScrollBar()->setValue(verticalScrollBar()->value() -
 386                         lines *  verticalScrollBar()->singleStep());
 387         adjustViewWithScrollBar();
 388 }
 389
 390
 391 void GuiWorkArea::generateSyntheticMouseEvent()
 392 {
 393 // Set things off to generate the _next_ 'pseudo' event.
 394         if (synthetic_mouse_event_.restart_timeout)
 395                 synthetic_mouse_event_.timeout.start();
 396
 397         // Has anything changed on-screen since the last timeout signal
 398         // was received?
 399         double const scrollbar_value = verticalScrollBar()->value();
 400         if (scrollbar_value != synthetic_mouse_event_.scrollbar_value_old) {
 401                 // Yes it has. Store the params used to check this.
 402                 synthetic_mouse_event_.scrollbar_value_old = scrollbar_value;
 403
 404                 // ... and dispatch the event to the LyX core.
 405                 dispatch(synthetic_mouse_event_.cmd);
 406         }
 407 }
 408
 409
 410 void GuiWorkArea::keyPressEvent(QKeyEvent * ev)
 411 {
 412         // do nothing if there are other events
 413         // (the auto repeated events come too fast)
 414         // \todo FIXME: remove hard coded Qt keys, process the key binding
 415 #ifdef Q_WS_X11
 416         if (XEventsQueued(QX11Info::display(), 0) > 1 && ev->isAutoRepeat()
 417                         && (Qt::Key_PageDown || Qt::Key_PageUp)) {
 418                 LYXERR(Debug::KEY)
 419                         << BOOST_CURRENT_FUNCTION << endl
 420                         << "system is busy: scroll key event ignored" << endl;
 421                 ev->ignore();
 422                 return;
 423         }
 424 #endif
 425
 426         LYXERR(Debug::KEY) << BOOST_CURRENT_FUNCTION
 427                 << " count=" << ev->count()
 428                 << " text=" << fromqstr(ev->text())
 429                 << " isAutoRepeat=" << ev->isAutoRepeat()
 430                 << " key=" << ev->key()
 431                 << endl;
 432
 433         KeySymbol sym;
 434         setKeySymbol(&sym, ev);
 435         processKeySym(sym, q_key_state(ev->modifiers()));
 436 }
 437
 438
 439 void GuiWorkArea::doubleClickTimeout()
 440 {
 441         dc_event_.active = false;
 442 }
 443
 444
 445 void GuiWorkArea::mouseDoubleClickEvent(QMouseEvent * ev)
 446 {
 447         dc_event_ = double_click(ev);
 448         QTimer::singleShot(QApplication::doubleClickInterval(), this,
 449                            SLOT(doubleClickTimeout()));
 450         FuncRequest cmd(LFUN_MOUSE_DOUBLE,
 451                         ev->x(), ev->y(),
 452                         q_button_state(ev->button()));
 453         dispatch(cmd);
 454 }
 455
 456
 457 void GuiWorkArea::resizeEvent(QResizeEvent * ev)
 458 {
 459         QAbstractScrollArea::resizeEvent(ev);
 460         need_resize_ = true;
 461 }
 462
 463
 464 void GuiWorkArea::update(int x, int y, int w, int h)
 465 {
 466         viewport()->repaint(x, y, w, h);
 467 }
 468
 469
 470 void GuiWorkArea::paintEvent(QPaintEvent * ev)
 471 {
 472         QRect const rc = ev->rect();
 473         /*
 474         LYXERR(Debug::PAINTING) << "paintEvent begin: x: " << rc.x()
 475                 << " y: " << rc.y()
 476                 << " w: " << rc.width()
 477                 << " h: " << rc.height() << endl;
 478         */
 479
 480         if (need_resize_) {
 481                 verticalScrollBar()->setPageStep(viewport()->height());
 482                 screen_ = QPixmap(viewport()->width(), viewport()->height());
 483                 resizeBufferView();
 484                 updateScreen();
 485                 WorkArea::hideCursor();
 486                 WorkArea::showCursor();
 487                 need_resize_ = false;
 488         }
 489
 490         QPainter pain(viewport());
 491         pain.drawPixmap(rc, screen_, rc);
 492         cursor_->draw(pain);
 493 }
 494
 495
 496 void GuiWorkArea::expose(int x, int y, int w, int h)
 497 {
 498         updateScreen();
 499         update(x, y, w, h);
 500 }
 501
 502
 503 void GuiWorkArea::updateScreen()
 504 {
 505         GuiPainter pain(&screen_);
 506         verticalScrollBar()->show();
 507         buffer_view_->draw(pain);
 508 }
 509
 510
 511 void GuiWorkArea::showCursor(int x, int y, int h, CursorShape shape)
 512 {
 513         if (schedule_redraw_) {
 514                 buffer_view_->updateMetrics(false);
 515                 updateScreen();
 516                 viewport()->update(QRect(0, 0, viewport()->width(), viewport()->height()));
 517                 schedule_redraw_ = false;
 518                 // Show the cursor immediately after the update.
 519                 hideCursor();
 520                 toggleCursor();
 521                 return;
 522         }
 523
 524         cursor_->update(x, y, h, shape);
 525         cursor_->show();
 526         viewport()->update(cursor_->rect());
 527 }
 528
 529
 530 void GuiWorkArea::removeCursor()
 531 {
 532         cursor_->hide();
 533         //if (!qApp->focusWidget())
 534                 viewport()->update(cursor_->rect());
 535 }
 536
 537
 538 void GuiWorkArea::inputMethodEvent(QInputMethodEvent * e)
 539 {
 540         QString const & commit_string = e->commitString();
 541         docstring const & preedit_string
 542                 = qstring_to_ucs4(e->preeditString());
 543
 544         if (!commit_string.isEmpty()) {
 545
 546                 LYXERR(Debug::KEY) << BOOST_CURRENT_FUNCTION
 547                         << " preeditString =" << fromqstr(e->preeditString())
 548                         << " commitString  =" << fromqstr(e->commitString())
 549                         << endl;
 550
 551                 int key = 0;
 552
 553                 // FIXME Iwami 04/01/07: we should take care also of UTF16 surrogates here.
 554                 for (int i = 0; i < commit_string.size(); ++i) {
 555                         QKeyEvent ev(QEvent::KeyPress, key, Qt::NoModifier, commit_string[i]);
 556                         keyPressEvent(&ev);
 557                 }
 558         }
 559
 560         // Hide the cursor during the kana-kanji transformation.
 561         if (preedit_string.empty())
 562                 startBlinkingCursor();
 563         else
 564                 stopBlinkingCursor();
 565
 566         // last_width : for checking if last preedit string was/wasn't empty.
 567         static bool last_width = false;
 568         if (!last_width && preedit_string.empty()) {
 569                 // if last_width is last length of preedit string.
 570                 e->accept();
 571                 return;
 572         }
 573
 574         GuiPainter pain(&screen_);
 575         buffer_view_->updateMetrics(false);
 576         buffer_view_->draw(pain);
 577         Font font = buffer_view_->cursor().getFont();
 578         FontMetrics const & fm = theFontMetrics(font);
 579         int height = fm.maxHeight();
 580         int cur_x = cursor_->rect().left();
 581         int cur_y = cursor_->rect().bottom();
 582
 583         // redraw area of preedit string.
 584         update(0, cur_y - height, GuiWorkArea::width(),
 585                 (height + 1) * preedit_lines_);
 586
 587         if (preedit_string.empty()) {
 588                 last_width = false;
 589                 preedit_lines_ = 1;
 590                 e->accept();
 591                 return;
 592         }
 593         last_width = true;
 594
 595         // att : stores an IM attribute.
 596         QList<QInputMethodEvent::Attribute> const & att = e->attributes();
 597
 598         // get attributes of input method cursor.
 599         // cursor_pos : cursor position in preedit string.
 600         size_t cursor_pos = 0;
 601         bool cursor_is_visible = false;
 602         for (int i = 0; i < att.size(); ++i) {
 603                 if (att.at(i).type == QInputMethodEvent::Cursor) {
 604                         cursor_pos = att.at(i).start;
 605                         cursor_is_visible = att.at(i).length != 0;
 606                         break;
 607                 }
 608         }
 609
 610         size_t preedit_length = preedit_string.length();
 611
 612         // get position of selection in input method.
 613         // FIXME: isn't there a way to do this simplier?
 614         // rStart : cursor position in selected string in IM.
 615         size_t rStart = 0;
 616         // rLength : selected string length in IM.
 617         size_t rLength = 0;
 618         if (cursor_pos < preedit_length) {
 619                 for (int i = 0; i < att.size(); ++i) {
 620                         if (att.at(i).type == QInputMethodEvent::TextFormat) {
 621                                 if (att.at(i).start <= int(cursor_pos)
 622                                         && int(cursor_pos) < att.at(i).start + att.at(i).length) {
 623                                                 rStart = att.at(i).start;
 624                                                 rLength = att.at(i).length;
 625                                                 if (!cursor_is_visible)
 626                                                         cursor_pos += rLength;
 627                                                 break;
 628                                 }
 629                         }
 630                 }
 631         }
 632         else {
 633                 rStart = cursor_pos;
 634                 rLength = 0;
 635         }
 636
 637         int const right_margin = rightMargin();
 638         Painter::preedit_style ps;
 639         // Most often there would be only one line:
 640         preedit_lines_ = 1;
 641         for (size_t pos = 0; pos != preedit_length; ++pos) {
 642                 char_type const typed_char = preedit_string[pos];
 643                 // reset preedit string style
 644                 ps = Painter::preedit_default;
 645
 646                 // if we reached the right extremity of the screen, go to next line.
 647                 if (cur_x + fm.width(typed_char) > GuiWorkArea::width() - right_margin) {
 648                         cur_x = right_margin;
 649                         cur_y += height + 1;
 650                         ++preedit_lines_;
 651                 }
 652                 // preedit strings are displayed with dashed underline
 653                 // and partial strings are displayed white on black indicating
 654                 // that we are in selecting mode in the input method.
 655                 // FIXME: rLength == preedit_length is not a changing condition
 656                 // FIXME: should be put out of the loop.
 657                 if (pos >= rStart
 658                         && pos < rStart + rLength
 659                         && !(cursor_pos < rLength && rLength == preedit_length))
 660                         ps = Painter::preedit_selecting;
 661
 662                 if (pos == cursor_pos
 663                         && (cursor_pos < rLength && rLength == preedit_length))
 664                         ps = Painter::preedit_cursor;
 665
 666                 // draw one character and update cur_x.
 667                 cur_x += pain.preeditText(cur_x, cur_y, typed_char, font, ps);
 668         }
 669
 670         // update the preedit string screen area.
 671         update(0, cur_y - preedit_lines_*height, GuiWorkArea::width(),
 672                 (height + 1) * preedit_lines_);
 673
 674         // Don't forget to accept the event!
 675         e->accept();
 676 }
 677
 678
 679 QVariant GuiWorkArea::inputMethodQuery(Qt::InputMethodQuery query) const
 680 {
 681         QRect cur_r(0,0,0,0);
 682         switch (query) {
 683                 // this is the CJK-specific composition window position.
 684                 case Qt::ImMicroFocus:
 685                         cur_r = cursor_->rect();
 686                         if (preedit_lines_ != 1)
 687                                 cur_r.moveLeft(10);
 688                         cur_r.moveBottom(cur_r.bottom() + cur_r.height() * preedit_lines_);
 689                         // return lower right of cursor in LyX.
 690                         return cur_r;
 691                 default:
 692                         return QWidget::inputMethodQuery(query);
 693         }
 694 }
 695
 696 ////////////////////////////////////////////////////////////////////
 697 // TabWorkArea implementation.
 698 ////////////////////////////////////////////////////////////////////
 699 TabWorkArea::TabWorkArea(QWidget * parent): QTabWidget(parent)
 700 {
 701         QPalette pal = palette();
 702         pal.setColor(QPalette::Active, QPalette::Button, pal.color(QPalette::Active, QPalette::Window));
 703         pal.setColor(QPalette::Disabled, QPalette::Button, pal.color(QPalette::Disabled, QPalette::Window));
 704         pal.setColor(QPalette::Inactive, QPalette::Button, pal.color(QPalette::Inactive, QPalette::Window));
 705
 706         QToolButton * closeTabButton = new QToolButton(this);
 707     closeTabButton->setPalette(pal);
 708         FileName const file = support::libFileSearch("images", "closetab", "png");
 709         if (!file.empty()) {
 710                 QPixmap pm(toqstr(file.absFilename()));
 711                 closeTabButton->setIcon(QIcon(pm));
 712         } else {
 713                 closeTabButton->setText("Close");
 714         }
 715         closeTabButton->setAutoRaise(true);
 716         closeTabButton->setCursor(Qt::ArrowCursor);
 717         closeTabButton->setToolTip(tr("Close tab"));
 718         closeTabButton->setEnabled(true);
 719
 720         QObject::connect(this, SIGNAL(currentChanged(int)),
 721                 this, SLOT(on_currentTabChanged(int)));
 722         QObject::connect(closeTabButton, SIGNAL(clicked()),
 723                 this, SLOT(closeCurrentTab()));
 724
 725         setCornerWidget(closeTabButton);
 726 #if QT_VERSION >= 0x040200
 727         setUsesScrollButtons(true);
 728 #endif
 729 }
 730
 731
 732 void TabWorkArea::showBar(bool show)
 733 {
 734         tabBar()->setVisible(show);
 735 }
 736
 737
 738 void TabWorkArea::closeAll()
 739 {
 740         while (count()) {
 741                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(0));
 742                 BOOST_ASSERT(wa);
 743                 removeTab(0);
 744                 delete wa;
 745         }
 746 }
 747
 748
 749 bool TabWorkArea::setCurrentWorkArea(GuiWorkArea * work_area)
 750 {
 751         BOOST_ASSERT(work_area);
 752         int index = indexOf(work_area);
 753         if (index == -1)
 754                 return false;
 755
 756         if (index == currentIndex())
 757                 // Make sure the work area is up to date.
 758                 on_currentTabChanged(index);
 759         else
 760                 // Switch to the work area.
 761                 setCurrentIndex(index);
 762         work_area->setFocus();
 763
 764         return true;
 765 }
 766
 767
 768 bool TabWorkArea::removeWorkArea(GuiWorkArea * work_area)
 769 {
 770         BOOST_ASSERT(work_area);
 771         int index = indexOf(work_area);
 772         if (index == -1)
 773                 return false;
 774
 775         work_area->setUpdatesEnabled(false);
 776         removeTab(index);
 777         delete work_area;
 778
 779         if (count()) {
 780                 // make sure the next work area is enabled.
 781                 currentWidget()->setUpdatesEnabled(true);
 782                 // Hide tabbar if there's only one tab.
 783                 showBar(count() > 1);
 784         }
 785         return true;
 786 }
 787
 788
 789 void TabWorkArea::on_currentTabChanged(int i)
 790 {
 791         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i));
 792         BOOST_ASSERT(wa);
 793         BufferView & bv = wa->bufferView();
 794         bv.updateMetrics(false);
 795         bv.cursor().fixIfBroken();
 796         wa->setUpdatesEnabled(true);
 797         wa->redraw();
 798         wa->setFocus();
 799         ///
 800         currentWorkAreaChanged(wa);
 801
 802         LYXERR(Debug::GUI) << "currentTabChanged " << i
 803                 << "File" << bv.buffer().fileName() << endl;
 804 }
 805
 806
 807 void TabWorkArea::closeCurrentTab()
 808 {
 809         lyx::dispatch(FuncRequest(LFUN_BUFFER_CLOSE));
 810 }
 811
 812 } // namespace frontend
 813 } // namespace lyx
 814
 815 #include "GuiWorkArea_moc.cpp"