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 "Cursor.h"
  26 #include "debug.h"
  27 #include "FuncRequest.h"
  28 #include "LyXFunc.h"
  29 #include "LyXRC.h"
  30 #include "version.h"
  31
  32 #include "graphics/GraphicsImage.h"
  33 #include "graphics/GraphicsLoader.h"
  34
  35 #include <QInputContext>
  36 #include <QLayout>
  37 #include <QMainWindow>
  38 #include <QPainter>
  39 #include <QToolButton>
  40 #include <QPalette>
  41 #include <QScrollBar>
  42 #include <QTabBar>
  43 #include <QTimer>
  44
  45 #include <boost/current_function.hpp>
  46 #include <boost/bind.hpp>
  47
  48 #ifdef Q_WS_X11
  49 #include <QX11Info>
  50 extern "C" int XEventsQueued(Display *display, int mode);
  51 #endif
  52
  53 #ifdef Q_WS_WIN
  54 int const CursorWidth = 2;
  55 #else
  56 int const CursorWidth = 1;
  57 #endif
  58
  59 #undef KeyPress
  60 #undef NoModifier
  61
  62 using std::endl;
  63 using std::string;
  64
  65 namespace lyx {
  66
  67 using support::FileName;
  68
  69 /// return the LyX mouse button state from Qt's
  70 static mouse_button::state q_button_state(Qt::MouseButton button)
  71 {
  72         mouse_button::state b = mouse_button::none;
  73         switch (button) {
  74                 case Qt::LeftButton:
  75                         b = mouse_button::button1;
  76                         break;
  77                 case Qt::MidButton:
  78                         b = mouse_button::button2;
  79                         break;
  80                 case Qt::RightButton:
  81                         b = mouse_button::button3;
  82                         break;
  83                 default:
  84                         break;
  85         }
  86         return b;
  87 }
  88
  89
  90 /// return the LyX mouse button state from Qt's
  91 mouse_button::state q_motion_state(Qt::MouseButtons state)
  92 {
  93         mouse_button::state b = mouse_button::none;
  94         if (state & Qt::LeftButton)
  95                 b |= mouse_button::button1;
  96         if (state & Qt::MidButton)
  97                 b |= mouse_button::button2;
  98         if (state & Qt::RightButton)
  99                 b |= mouse_button::button3;
 100         return b;
 101 }
 102
 103
 104 namespace frontend {
 105
 106 class CursorWidget {
 107 public:
 108         CursorWidget() {}
 109
 110         void draw(QPainter & painter)
 111         {
 112                 if (show_ && rect_.isValid()) {
 113                         switch (shape_) {
 114                         case L_SHAPE:
 115                                 painter.fillRect(rect_.x(), rect_.y(), CursorWidth, rect_.height(), color_);
 116                                 painter.setPen(color_);
 117                                 painter.drawLine(rect_.bottomLeft().x() + CursorWidth, rect_.bottomLeft().y(),
 118                                                                                                  rect_.bottomRight().x(), rect_.bottomLeft().y());
 119                                 break;
 120
 121                         case REVERSED_L_SHAPE:
 122                                 painter.fillRect(rect_.x() + rect_.height() / 3, rect_.y(), CursorWidth, rect_.height(), color_);
 123                                 painter.setPen(color_);
 124                                 painter.drawLine(rect_.bottomRight().x() - CursorWidth, rect_.bottomLeft().y(),
 125                                                                                                          rect_.bottomLeft().x(), rect_.bottomLeft().y());
 126                                 break;
 127
 128                         default:
 129                                 painter.fillRect(rect_, color_);
 130                                 break;
 131                         }
 132                 }
 133         }
 134
 135         void update(int x, int y, int h, CursorShape shape)
 136         {
 137                 color_ = guiApp->colorCache().get(Color_cursor);
 138                 shape_ = shape;
 139                 switch (shape) {
 140                 case L_SHAPE:
 141                         rect_ = QRect(x, y, CursorWidth + h / 3, h);
 142                         break;
 143                 case REVERSED_L_SHAPE:
 144                         rect_ = QRect(x - h / 3, y, CursorWidth + h / 3, h);
 145                         break;
 146                 default:
 147                         rect_ = QRect(x, y, CursorWidth, h);
 148                         break;
 149                 }
 150         }
 151
 152         void show(bool set_show = true) { show_ = set_show; }
 153         void hide() { show_ = false; }
 154
 155         QRect const & rect() { return rect_; }
 156
 157 private:
 158         ///
 159         CursorShape shape_;
 160         ///
 161         bool show_;
 162         ///
 163         QColor color_;
 164         ///
 165         QRect rect_;
 166 };
 167
 168
 169 // This is a 'heartbeat' generating synthetic mouse move events when the
 170 // cursor is at the top or bottom edge of the viewport. One scroll per 0.2 s
 171 SyntheticMouseEvent::SyntheticMouseEvent()
 172         : timeout(200), restart_timeout(true),
 173           x_old(-1), y_old(-1), scrollbar_value_old(-1.0)
 174 {}
 175
 176
 177 GuiWorkArea::GuiWorkArea(Buffer & buf, LyXView & lv)
 178         : WorkArea(buf, lv), need_resize_(false), schedule_redraw_(false),
 179           preedit_lines_(1)
 180 {
 181         screen_ = QPixmap(viewport()->width(), viewport()->height());
 182         cursor_ = new frontend::CursorWidget();
 183         cursor_->hide();
 184
 185         setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
 186         setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 187         setAcceptDrops(true);
 188         setMouseTracking(true);
 189         setMinimumSize(100, 70);
 190
 191         viewport()->setAutoFillBackground(false);
 192         // We don't need double-buffering nor SystemBackground on
 193         // the viewport because we have our own backing pixmap.
 194         viewport()->setAttribute(Qt::WA_NoSystemBackground);
 195
 196         setFocusPolicy(Qt::WheelFocus);
 197
 198         viewport()->setCursor(Qt::IBeamCursor);
 199
 200         synthetic_mouse_event_.timeout.timeout.connect(
 201                 boost::bind(&GuiWorkArea::generateSyntheticMouseEvent,
 202                             this));
 203
 204         // Initialize the vertical Scroll Bar
 205         QObject::connect(verticalScrollBar(), SIGNAL(actionTriggered(int)),
 206                 this, SLOT(adjustViewWithScrollBar(int)));
 207
 208         // disable context menu for the scrollbar
 209         verticalScrollBar()->setContextMenuPolicy(Qt::NoContextMenu);
 210
 211         // PageStep only depends on the viewport height.
 212         verticalScrollBar()->setPageStep(viewport()->height());
 213
 214         LYXERR(Debug::GUI) << BOOST_CURRENT_FUNCTION
 215                 << "\n Area width\t" << width()
 216                 << "\n Area height\t" << height()
 217                 << "\n viewport width\t" << viewport()->width()
 218                 << "\n viewport height\t" << viewport()->height()
 219                 << endl;
 220
 221         // Enables input methods for asian languages.
 222         // Must be set when creating custom text editing widgets.
 223         setAttribute(Qt::WA_InputMethodEnabled, true);
 224 }
 225
 226
 227 void GuiWorkArea::setScrollbarParams(int h, int scroll_pos, int scroll_line_step)
 228 {
 229         if (verticalScrollBarPolicy() != Qt::ScrollBarAlwaysOn)
 230                 setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
 231
 232         verticalScrollBar()->setTracking(false);
 233
 234         // do what cursor movement does (some grey)
 235         h += height() / 4;
 236         int scroll_max_ = std::max(0, h - height());
 237
 238         verticalScrollBar()->setRange(0, scroll_max_);
 239         verticalScrollBar()->setSliderPosition(scroll_pos);
 240         verticalScrollBar()->setSingleStep(scroll_line_step);
 241         verticalScrollBar()->setValue(scroll_pos);
 242
 243         verticalScrollBar()->setTracking(true);
 244 }
 245
 246
 247 void GuiWorkArea::adjustViewWithScrollBar(int action)
 248 {
 249         stopBlinkingCursor();
 250         if (action == QAbstractSlider::SliderPageStepAdd)
 251                 buffer_view_->scrollDown(viewport()->height());
 252         else if (action == QAbstractSlider::SliderPageStepSub)
 253                 buffer_view_->scrollUp(viewport()->height());
 254         else
 255                 buffer_view_->scrollDocView(verticalScrollBar()->sliderPosition());
 256
 257         if (lyxrc.cursor_follows_scrollbar) {
 258                 buffer_view_->setCursorFromScrollbar();
 259                 lyx_view_->updateLayoutChoice();
 260         }
 261         // Show the cursor immediately after any operation.
 262         startBlinkingCursor();
 263         QApplication::syncX();
 264 }
 265
 266
 267 void GuiWorkArea::focusInEvent(QFocusEvent * /*event*/)
 268 {
 269         // Repaint the whole screen.
 270         // Note: this is different from redraw() as only the backing pixmap
 271         // will be redrawn, which is cheap.
 272         viewport()->repaint();
 273
 274         startBlinkingCursor();
 275 }
 276
 277
 278 void GuiWorkArea::focusOutEvent(QFocusEvent * /*event*/)
 279 {
 280         stopBlinkingCursor();
 281 }
 282
 283
 284 void GuiWorkArea::mousePressEvent(QMouseEvent * e)
 285 {
 286         if (dc_event_.active && dc_event_ == *e) {
 287                 dc_event_.active = false;
 288                 FuncRequest cmd(LFUN_MOUSE_TRIPLE, e->x(), e->y(),
 289                         q_button_state(e->button()));
 290                 dispatch(cmd);
 291                 return;
 292         }
 293
 294         inputContext()->reset();
 295
 296         FuncRequest const cmd(LFUN_MOUSE_PRESS, e->x(), e->y(),
 297                 q_button_state(e->button()));
 298         dispatch(cmd, q_key_state(e->modifiers()));
 299 }
 300
 301
 302 void GuiWorkArea::mouseReleaseEvent(QMouseEvent * e)
 303 {
 304         if (synthetic_mouse_event_.timeout.running())
 305                 synthetic_mouse_event_.timeout.stop();
 306
 307         FuncRequest const cmd(LFUN_MOUSE_RELEASE, e->x(), e->y(),
 308                               q_button_state(e->button()));
 309         dispatch(cmd);
 310 }
 311
 312
 313 void GuiWorkArea::mouseMoveEvent(QMouseEvent * e)
 314 {
 315         // we kill the triple click if we move
 316         doubleClickTimeout();
 317         FuncRequest cmd(LFUN_MOUSE_MOTION, e->x(), e->y(),
 318                               q_motion_state(e->buttons()));
 319
 320         // If we're above or below the work area...
 321         if (e->y() <= 20 || e->y() >= viewport()->height() - 20) {
 322                 // Make sure only a synthetic event can cause a page scroll,
 323                 // so they come at a steady rate:
 324                 if (e->y() <= 20)
 325                         // _Force_ a scroll up:
 326                         cmd.y = -40;
 327                 else
 328                         cmd.y = viewport()->height();
 329                 // Store the event, to be handled when the timeout expires.
 330                 synthetic_mouse_event_.cmd = cmd;
 331
 332                 if (synthetic_mouse_event_.timeout.running())
 333                         // Discard the event. Note that it _may_ be handled
 334                         // when the timeout expires if
 335                         // synthetic_mouse_event_.cmd has not been overwritten.
 336                         // Ie, when the timeout expires, we handle the
 337                         // most recent event but discard all others that
 338                         // occurred after the one used to start the timeout
 339                         // in the first place.
 340                         return;
 341                 else {
 342                         synthetic_mouse_event_.restart_timeout = true;
 343                         synthetic_mouse_event_.timeout.start();
 344                         // Fall through to handle this event...
 345                 }
 346
 347         } else if (synthetic_mouse_event_.timeout.running()) {
 348                 // Store the event, to be possibly handled when the timeout
 349                 // expires.
 350                 // Once the timeout has expired, normal control is returned
 351                 // to mouseMoveEvent (restart_timeout = false).
 352                 // This results in a much smoother 'feel' when moving the
 353                 // mouse back into the work area.
 354                 synthetic_mouse_event_.cmd = cmd;
 355                 synthetic_mouse_event_.restart_timeout = false;
 356                 return;
 357         }
 358
 359         // Has anything changed on-screen since the last QMouseEvent
 360         // was received?
 361         double const scrollbar_value = verticalScrollBar()->value();
 362         if (e->x() != synthetic_mouse_event_.x_old ||
 363             e->y() != synthetic_mouse_event_.y_old ||
 364             scrollbar_value != synthetic_mouse_event_.scrollbar_value_old) {
 365                 // Yes it has. Store the params used to check this.
 366                 synthetic_mouse_event_.x_old = e->x();
 367                 synthetic_mouse_event_.y_old = e->y();
 368                 synthetic_mouse_event_.scrollbar_value_old = scrollbar_value;
 369
 370                 // ... and dispatch the event to the LyX core.
 371                 dispatch(cmd);
 372         }
 373 }
 374
 375
 376 void GuiWorkArea::wheelEvent(QWheelEvent * e)
 377 {
 378         // Wheel rotation by one notch results in a delta() of 120 (see
 379         // documentation of QWheelEvent)
 380         int const lines = qApp->wheelScrollLines() * e->delta() / 120;
 381         verticalScrollBar()->setValue(verticalScrollBar()->value() -
 382                         lines *  verticalScrollBar()->singleStep());
 383         adjustViewWithScrollBar();
 384 }
 385
 386
 387 void GuiWorkArea::generateSyntheticMouseEvent()
 388 {
 389 // Set things off to generate the _next_ 'pseudo' event.
 390         if (synthetic_mouse_event_.restart_timeout)
 391                 synthetic_mouse_event_.timeout.start();
 392
 393         // Has anything changed on-screen since the last timeout signal
 394         // was received?
 395         double const scrollbar_value = verticalScrollBar()->value();
 396         if (scrollbar_value != synthetic_mouse_event_.scrollbar_value_old) {
 397                 // Yes it has. Store the params used to check this.
 398                 synthetic_mouse_event_.scrollbar_value_old = scrollbar_value;
 399
 400                 // ... and dispatch the event to the LyX core.
 401                 dispatch(synthetic_mouse_event_.cmd);
 402         }
 403 }
 404
 405
 406 void GuiWorkArea::keyPressEvent(QKeyEvent * ev)
 407 {
 408         // do nothing if there are other events
 409         // (the auto repeated events come too fast)
 410         // \todo FIXME: remove hard coded Qt keys, process the key binding
 411 #ifdef Q_WS_X11
 412         if (XEventsQueued(QX11Info::display(), 0) > 1 && ev->isAutoRepeat()
 413                         && (Qt::Key_PageDown || Qt::Key_PageUp)) {
 414                 LYXERR(Debug::KEY)
 415                         << BOOST_CURRENT_FUNCTION << endl
 416                         << "system is busy: scroll key event ignored" << endl;
 417                 ev->ignore();
 418                 return;
 419         }
 420 #endif
 421
 422         LYXERR(Debug::KEY) << BOOST_CURRENT_FUNCTION
 423                 << " count=" << ev->count()
 424                 << " text=" << fromqstr(ev->text())
 425                 << " isAutoRepeat=" << ev->isAutoRepeat()
 426                 << " key=" << ev->key()
 427                 << endl;
 428
 429         KeySymbol sym;
 430         setKeySymbol(&sym, ev);
 431         processKeySym(sym, q_key_state(ev->modifiers()));
 432 }
 433
 434
 435 void GuiWorkArea::doubleClickTimeout()
 436 {
 437         dc_event_.active = false;
 438 }
 439
 440
 441 void GuiWorkArea::mouseDoubleClickEvent(QMouseEvent * ev)
 442 {
 443         dc_event_ = double_click(ev);
 444         QTimer::singleShot(QApplication::doubleClickInterval(), this,
 445                            SLOT(doubleClickTimeout()));
 446         FuncRequest cmd(LFUN_MOUSE_DOUBLE,
 447                         ev->x(), ev->y(),
 448                         q_button_state(ev->button()));
 449         dispatch(cmd);
 450 }
 451
 452
 453 void GuiWorkArea::resizeEvent(QResizeEvent * ev)
 454 {
 455         QAbstractScrollArea::resizeEvent(ev);
 456         need_resize_ = true;
 457 }
 458
 459
 460 void GuiWorkArea::update(int x, int y, int w, int h)
 461 {
 462         viewport()->repaint(x, y, w, h);
 463 }
 464
 465
 466 void GuiWorkArea::paintEvent(QPaintEvent * ev)
 467 {
 468         QRect const rc = ev->rect();
 469         /*
 470         LYXERR(Debug::PAINTING) << "paintEvent begin: x: " << rc.x()
 471                 << " y: " << rc.y()
 472                 << " w: " << rc.width()
 473                 << " h: " << rc.height() << endl;
 474         */
 475
 476         if (need_resize_) {
 477                 verticalScrollBar()->setPageStep(viewport()->height());
 478                 screen_ = QPixmap(viewport()->width(), viewport()->height());
 479                 resizeBufferView();
 480                 updateScreen();
 481                 WorkArea::hideCursor();
 482                 WorkArea::showCursor();
 483                 need_resize_ = false;
 484         }
 485
 486         QPainter pain(viewport());
 487         pain.drawPixmap(rc, screen_, rc);
 488         cursor_->draw(pain);
 489 }
 490
 491
 492 void GuiWorkArea::expose(int x, int y, int w, int h)
 493 {
 494         updateScreen();
 495         update(x, y, w, h);
 496 }
 497
 498
 499 void GuiWorkArea::updateScreen()
 500 {
 501         GuiPainter pain(&screen_);
 502         verticalScrollBar()->show();
 503         buffer_view_->draw(pain);
 504 }
 505
 506
 507 void GuiWorkArea::showCursor(int x, int y, int h, CursorShape shape)
 508 {
 509         if (schedule_redraw_) {
 510                 buffer_view_->updateMetrics(false);
 511                 updateScreen();
 512                 viewport()->update(QRect(0, 0, viewport()->width(), viewport()->height()));
 513                 schedule_redraw_ = false;
 514                 // Show the cursor immediately after the update.
 515                 hideCursor();
 516                 toggleCursor();
 517                 return;
 518         }
 519
 520         cursor_->update(x, y, h, shape);
 521         cursor_->show();
 522         viewport()->update(cursor_->rect());
 523 }
 524
 525
 526 void GuiWorkArea::removeCursor()
 527 {
 528         cursor_->hide();
 529         //if (!qApp->focusWidget())
 530                 viewport()->update(cursor_->rect());
 531 }
 532
 533
 534 void GuiWorkArea::inputMethodEvent(QInputMethodEvent * e)
 535 {
 536         QString const & commit_string = e->commitString();
 537         docstring const & preedit_string
 538                 = qstring_to_ucs4(e->preeditString());
 539
 540         if (!commit_string.isEmpty()) {
 541
 542                 LYXERR(Debug::KEY) << BOOST_CURRENT_FUNCTION
 543                         << " preeditString =" << fromqstr(e->preeditString())
 544                         << " commitString  =" << fromqstr(e->commitString())
 545                         << endl;
 546
 547                 int key = 0;
 548
 549                 // FIXME Iwami 04/01/07: we should take care also of UTF16 surrogates here.
 550                 for (int i = 0; i < commit_string.size(); ++i) {
 551                         QKeyEvent ev(QEvent::KeyPress, key, Qt::NoModifier, commit_string[i]);
 552                         keyPressEvent(&ev);
 553                 }
 554         }
 555
 556         // Hide the cursor during the kana-kanji transformation.
 557         if (preedit_string.empty())
 558                 startBlinkingCursor();
 559         else
 560                 stopBlinkingCursor();
 561
 562         // last_width : for checking if last preedit string was/wasn't empty.
 563         static bool last_width = false;
 564         if (!last_width && preedit_string.empty()) {
 565                 // if last_width is last length of preedit string.
 566                 e->accept();
 567                 return;
 568         }
 569
 570         GuiPainter pain(&screen_);
 571         buffer_view_->updateMetrics(false);
 572         buffer_view_->draw(pain);
 573         Font font = buffer_view_->cursor().getFont();
 574         FontMetrics const & fm = theFontMetrics(font);
 575         int height = fm.maxHeight();
 576         int cur_x = cursor_->rect().left();
 577         int cur_y = cursor_->rect().bottom();
 578
 579         // redraw area of preedit string.
 580         update(0, cur_y - height, GuiWorkArea::width(),
 581                 (height + 1) * preedit_lines_);
 582
 583         if (preedit_string.empty()) {
 584                 last_width = false;
 585                 preedit_lines_ = 1;
 586                 e->accept();
 587                 return;
 588         }
 589         last_width = true;
 590
 591         // att : stores an IM attribute.
 592         QList<QInputMethodEvent::Attribute> const & att = e->attributes();
 593
 594         // get attributes of input method cursor.
 595         // cursor_pos : cursor position in preedit string.
 596         size_t cursor_pos = 0;
 597         bool cursor_is_visible = false;
 598         for (int i = 0; i < att.size(); ++i) {
 599                 if (att.at(i).type == QInputMethodEvent::Cursor) {
 600                         cursor_pos = att.at(i).start;
 601                         cursor_is_visible = att.at(i).length != 0;
 602                         break;
 603                 }
 604         }
 605
 606         size_t preedit_length = preedit_string.length();
 607
 608         // get position of selection in input method.
 609         // FIXME: isn't there a way to do this simplier?
 610         // rStart : cursor position in selected string in IM.
 611         size_t rStart = 0;
 612         // rLength : selected string length in IM.
 613         size_t rLength = 0;
 614         if (cursor_pos < preedit_length) {
 615                 for (int i = 0; i < att.size(); ++i) {
 616                         if (att.at(i).type == QInputMethodEvent::TextFormat) {
 617                                 if (att.at(i).start <= int(cursor_pos)
 618                                         && int(cursor_pos) < att.at(i).start + att.at(i).length) {
 619                                                 rStart = att.at(i).start;
 620                                                 rLength = att.at(i).length;
 621                                                 if (!cursor_is_visible)
 622                                                         cursor_pos += rLength;
 623                                                 break;
 624                                 }
 625                         }
 626                 }
 627         }
 628         else {
 629                 rStart = cursor_pos;
 630                 rLength = 0;
 631         }
 632
 633         int const right_margin = rightMargin();
 634         Painter::preedit_style ps;
 635         // Most often there would be only one line:
 636         preedit_lines_ = 1;
 637         for (size_t pos = 0; pos != preedit_length; ++pos) {
 638                 char_type const typed_char = preedit_string[pos];
 639                 // reset preedit string style
 640                 ps = Painter::preedit_default;
 641
 642                 // if we reached the right extremity of the screen, go to next line.
 643                 if (cur_x + fm.width(typed_char) > GuiWorkArea::width() - right_margin) {
 644                         cur_x = right_margin;
 645                         cur_y += height + 1;
 646                         ++preedit_lines_;
 647                 }
 648                 // preedit strings are displayed with dashed underline
 649                 // and partial strings are displayed white on black indicating
 650                 // that we are in selecting mode in the input method.
 651                 // FIXME: rLength == preedit_length is not a changing condition
 652                 // FIXME: should be put out of the loop.
 653                 if (pos >= rStart
 654                         && pos < rStart + rLength
 655                         && !(cursor_pos < rLength && rLength == preedit_length))
 656                         ps = Painter::preedit_selecting;
 657
 658                 if (pos == cursor_pos
 659                         && (cursor_pos < rLength && rLength == preedit_length))
 660                         ps = Painter::preedit_cursor;
 661
 662                 // draw one character and update cur_x.
 663                 cur_x += pain.preeditText(cur_x, cur_y, typed_char, font, ps);
 664         }
 665
 666         // update the preedit string screen area.
 667         update(0, cur_y - preedit_lines_*height, GuiWorkArea::width(),
 668                 (height + 1) * preedit_lines_);
 669
 670         // Don't forget to accept the event!
 671         e->accept();
 672 }
 673
 674
 675 QVariant GuiWorkArea::inputMethodQuery(Qt::InputMethodQuery query) const
 676 {
 677         QRect cur_r(0,0,0,0);
 678         switch (query) {
 679                 // this is the CJK-specific composition window position.
 680                 case Qt::ImMicroFocus:
 681                         cur_r = cursor_->rect();
 682                         if (preedit_lines_ != 1)
 683                                 cur_r.moveLeft(10);
 684                         cur_r.moveBottom(cur_r.bottom() + cur_r.height() * preedit_lines_);
 685                         // return lower right of cursor in LyX.
 686                         return cur_r;
 687                 default:
 688                         return QWidget::inputMethodQuery(query);
 689         }
 690 }
 691
 692
 693 ////////////////////////////////////////////////////////////////////
 694 //
 695 // TabWorkArea
 696 //
 697 ////////////////////////////////////////////////////////////////////
 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         closeTabButton->setIcon(QIcon(":/images/closetab.png"));
 709         closeTabButton->setText("Close");
 710         closeTabButton->setAutoRaise(true);
 711         closeTabButton->setCursor(Qt::ArrowCursor);
 712         closeTabButton->setToolTip(tr("Close tab"));
 713         closeTabButton->setEnabled(true);
 714
 715         QObject::connect(this, SIGNAL(currentChanged(int)),
 716                 this, SLOT(on_currentTabChanged(int)));
 717         QObject::connect(closeTabButton, SIGNAL(clicked()),
 718                 this, SLOT(closeCurrentTab()));
 719
 720         setCornerWidget(closeTabButton);
 721 #if QT_VERSION >= 0x040200
 722         setUsesScrollButtons(true);
 723 #endif
 724 }
 725
 726
 727 void TabWorkArea::showBar(bool show)
 728 {
 729         tabBar()->setVisible(show);
 730 }
 731
 732
 733 GuiWorkArea * TabWorkArea::currentWorkArea()
 734 {
 735         if (count() == 0)
 736                 return 0;
 737
 738         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(currentWidget());
 739         BOOST_ASSERT(wa);
 740         return wa;
 741 }
 742
 743
 744 GuiWorkArea * TabWorkArea::workArea(Buffer & buffer)
 745 {
 746         for (int i = 0; i != count(); ++i) {
 747                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i));
 748                 BOOST_ASSERT(wa);
 749                 if (&wa->bufferView().buffer() == &buffer)
 750                         return wa;
 751         }
 752         return 0;
 753 }
 754
 755
 756 void TabWorkArea::closeAll()
 757 {
 758         while (count()) {
 759                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(0));
 760                 BOOST_ASSERT(wa);
 761                 removeTab(0);
 762                 delete wa;
 763         }
 764 }
 765
 766
 767 bool TabWorkArea::setCurrentWorkArea(GuiWorkArea * work_area)
 768 {
 769         BOOST_ASSERT(work_area);
 770         int index = indexOf(work_area);
 771         if (index == -1)
 772                 return false;
 773
 774         if (index == currentIndex())
 775                 // Make sure the work area is up to date.
 776                 on_currentTabChanged(index);
 777         else
 778                 // Switch to the work area.
 779                 setCurrentIndex(index);
 780         work_area->setFocus();
 781
 782         return true;
 783 }
 784
 785
 786 bool TabWorkArea::removeWorkArea(GuiWorkArea * work_area)
 787 {
 788         BOOST_ASSERT(work_area);
 789         int index = indexOf(work_area);
 790         if (index == -1)
 791                 return false;
 792
 793         work_area->setUpdatesEnabled(false);
 794         removeTab(index);
 795         delete work_area;
 796
 797         if (count()) {
 798                 // make sure the next work area is enabled.
 799                 currentWidget()->setUpdatesEnabled(true);
 800                 // Hide tabbar if there's only one tab.
 801                 showBar(count() > 1);
 802         }
 803         return true;
 804 }
 805
 806
 807 void TabWorkArea::on_currentTabChanged(int i)
 808 {
 809         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i));
 810         BOOST_ASSERT(wa);
 811         BufferView & bv = wa->bufferView();
 812         bv.updateMetrics(false);
 813         bv.cursor().fixIfBroken();
 814         wa->setUpdatesEnabled(true);
 815         wa->redraw();
 816         wa->setFocus();
 817         ///
 818         currentWorkAreaChanged(wa);
 819
 820         LYXERR(Debug::GUI) << "currentTabChanged " << i
 821                 << "File" << bv.buffer().absFileName() << endl;
 822 }
 823
 824
 825 void TabWorkArea::closeCurrentTab()
 826 {
 827         lyx::dispatch(FuncRequest(LFUN_BUFFER_CLOSE));
 828 }
 829
 830 } // namespace frontend
 831 } // namespace lyx
 832
 833 #include "GuiWorkArea_moc.cpp"