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