src/frontends/qt4/GuiWorkArea.cpp

   1 /**
   2  * \file GuiWorkArea.cpp
   3  * This file is part of LyX, the document processor.
   4  * Licence details can be found in the file COPYING.
   5  *
   6  * \author John Levon
   7  * \author Abdelrazak Younes
   8  *
   9  * Full author contact details are available in file CREDITS.
  10  */
  11
  12 #include <config.h>
  13
  14 #include "GuiWorkArea.h"
  15
  16 #include "Buffer.h"
  17 #include "BufferParams.h"
  18 #include "BufferView.h"
  19 #include "CoordCache.h"
  20 #include "Cursor.h"
  21 #include "Font.h"
  22 #include "FuncRequest.h"
  23 #include "GuiApplication.h"
  24 #include "GuiKeySymbol.h"
  25 #include "GuiPainter.h"
  26 #include "GuiView.h"
  27 #include "KeySymbol.h"
  28 #include "Language.h"
  29 #include "LyXFunc.h"
  30 #include "LyXRC.h"
  31 #include "MetricsInfo.h"
  32 #include "qt_helpers.h"
  33 #include "version.h"
  34
  35 #include "graphics/GraphicsImage.h"
  36 #include "graphics/GraphicsLoader.h"
  37
  38 #include "support/debug.h"
  39 #include "support/gettext.h"
  40 #include "support/FileName.h"
  41 #include "support/ForkedCalls.h"
  42
  43 #include "frontends/Application.h"
  44 #include "frontends/FontMetrics.h"
  45 #include "frontends/WorkAreaManager.h"
  46
  47 #include <QInputContext>
  48 #include <QLayout>
  49 #include <QMainWindow>
  50 #include <QPainter>
  51 #include <QToolButton>
  52 #include <QPalette>
  53 #include <QScrollBar>
  54 #include <QTabBar>
  55 #include <QTimer>
  56
  57 #include <boost/bind.hpp>
  58
  59 #ifdef Q_WS_X11
  60 #include <QX11Info>
  61 extern "C" int XEventsQueued(Display *display, int mode);
  62 #endif
  63
  64 #ifdef Q_WS_WIN
  65 int const CursorWidth = 2;
  66 #else
  67 int const CursorWidth = 1;
  68 #endif
  69
  70 #undef KeyPress
  71 #undef NoModifier
  72
  73 using namespace std;
  74
  75 namespace lyx {
  76
  77 using support::FileName;
  78
  79
  80 /// return the LyX mouse button state from Qt's
  81 static mouse_button::state q_button_state(Qt::MouseButton button)
  82 {
  83         mouse_button::state b = mouse_button::none;
  84         switch (button) {
  85                 case Qt::LeftButton:
  86                         b = mouse_button::button1;
  87                         break;
  88                 case Qt::MidButton:
  89                         b = mouse_button::button2;
  90                         break;
  91                 case Qt::RightButton:
  92                         b = mouse_button::button3;
  93                         break;
  94                 default:
  95                         break;
  96         }
  97         return b;
  98 }
  99
 100
 101 /// return the LyX mouse button state from Qt's
 102 mouse_button::state q_motion_state(Qt::MouseButtons state)
 103 {
 104         mouse_button::state b = mouse_button::none;
 105         if (state & Qt::LeftButton)
 106                 b |= mouse_button::button1;
 107         if (state & Qt::MidButton)
 108                 b |= mouse_button::button2;
 109         if (state & Qt::RightButton)
 110                 b |= mouse_button::button3;
 111         return b;
 112 }
 113
 114
 115 namespace frontend {
 116
 117 class CursorWidget {
 118 public:
 119         CursorWidget() {}
 120
 121         void draw(QPainter & painter)
 122         {
 123                 if (show_ && rect_.isValid()) {
 124                         switch (shape_) {
 125                         case L_SHAPE:
 126                                 painter.fillRect(rect_.x(), rect_.y(), CursorWidth, rect_.height(), color_);
 127                                 painter.setPen(color_);
 128                                 painter.drawLine(rect_.bottomLeft().x() + CursorWidth, rect_.bottomLeft().y(),
 129                                                                                                  rect_.bottomRight().x(), rect_.bottomLeft().y());
 130                                 break;
 131
 132                         case REVERSED_L_SHAPE:
 133                                 painter.fillRect(rect_.x() + rect_.height() / 3, rect_.y(), CursorWidth, rect_.height(), color_);
 134                                 painter.setPen(color_);
 135                                 painter.drawLine(rect_.bottomRight().x() - CursorWidth, rect_.bottomLeft().y(),
 136                                                                                                          rect_.bottomLeft().x(), rect_.bottomLeft().y());
 137                                 break;
 138
 139                         default:
 140                                 painter.fillRect(rect_, color_);
 141                                 break;
 142                         }
 143                 }
 144         }
 145
 146         void update(int x, int y, int h, CursorShape shape)
 147         {
 148                 color_ = guiApp->colorCache().get(Color_cursor);
 149                 shape_ = shape;
 150                 switch (shape) {
 151                 case L_SHAPE:
 152                         rect_ = QRect(x, y, CursorWidth + h / 3, h);
 153                         break;
 154                 case REVERSED_L_SHAPE:
 155                         rect_ = QRect(x - h / 3, y, CursorWidth + h / 3, h);
 156                         break;
 157                 default:
 158                         rect_ = QRect(x, y, CursorWidth, h);
 159                         break;
 160                 }
 161         }
 162
 163         void show(bool set_show = true) { show_ = set_show; }
 164         void hide() { show_ = false; }
 165
 166         QRect const & rect() { return rect_; }
 167
 168 private:
 169         ///
 170         CursorShape shape_;
 171         ///
 172         bool show_;
 173         ///
 174         QColor color_;
 175         ///
 176         QRect rect_;
 177 };
 178
 179
 180 // This is a 'heartbeat' generating synthetic mouse move events when the
 181 // cursor is at the top or bottom edge of the viewport. One scroll per 0.2 s
 182 SyntheticMouseEvent::SyntheticMouseEvent()
 183         : timeout(200), restart_timeout(true),
 184           x_old(-1), y_old(-1), scrollbar_value_old(-1.0)
 185 {}
 186
 187
 188
 189 GuiWorkArea::GuiWorkArea(Buffer & buffer, GuiView & lv)
 190         : buffer_view_(new BufferView(buffer)), lyx_view_(&lv),
 191           cursor_visible_(false),
 192     need_resize_(false), schedule_redraw_(false),
 193                 preedit_lines_(1)
 194 {
 195         buffer.workAreaManager().add(this);
 196         // Setup the signals
 197         cursor_timeout_.setInterval(400);
 198         connect(&cursor_timeout_, SIGNAL(timeout()),
 199                 this, SLOT(toggleCursor()));
 200
 201         cursor_timeout_.start();
 202
 203         screen_ = QPixmap(viewport()->width(), viewport()->height());
 204         cursor_ = new frontend::CursorWidget();
 205         cursor_->hide();
 206
 207         setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
 208         setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 209         setAcceptDrops(true);
 210         setMouseTracking(true);
 211         setMinimumSize(100, 70);
 212         updateWindowTitle();
 213
 214         viewport()->setAutoFillBackground(false);
 215         // We don't need double-buffering nor SystemBackground on
 216         // the viewport because we have our own backing pixmap.
 217         viewport()->setAttribute(Qt::WA_NoSystemBackground);
 218
 219         setFocusPolicy(Qt::WheelFocus);
 220
 221         viewport()->setCursor(Qt::IBeamCursor);
 222
 223         synthetic_mouse_event_.timeout.timeout.connect(
 224                 boost::bind(&GuiWorkArea::generateSyntheticMouseEvent,
 225                                         this));
 226
 227         // Initialize the vertical Scroll Bar
 228         QObject::connect(verticalScrollBar(), SIGNAL(actionTriggered(int)),
 229                 this, SLOT(adjustViewWithScrollBar(int)));
 230
 231         // disable context menu for the scrollbar
 232         verticalScrollBar()->setContextMenuPolicy(Qt::NoContextMenu);
 233
 234         // PageStep only depends on the viewport height.
 235         verticalScrollBar()->setPageStep(viewport()->height());
 236
 237         LYXERR(Debug::GUI, "viewport width: " << viewport()->width()
 238                 << "  viewport height: " << viewport()->height());
 239
 240         // Enables input methods for asian languages.
 241         // Must be set when creating custom text editing widgets.
 242         setAttribute(Qt::WA_InputMethodEnabled, true);
 243 }
 244
 245
 246
 247 GuiWorkArea::~GuiWorkArea()
 248 {
 249         buffer_view_->buffer().workAreaManager().remove(this);
 250         delete buffer_view_;
 251         delete cursor_;
 252 }
 253
 254
 255 void GuiWorkArea::close()
 256 {
 257         lyx_view_->removeWorkArea(this);
 258 }
 259
 260
 261 BufferView & GuiWorkArea::bufferView()
 262 {
 263         return *buffer_view_;
 264 }
 265
 266
 267 BufferView const & GuiWorkArea::bufferView() const
 268 {
 269         return *buffer_view_;
 270 }
 271
 272
 273 void GuiWorkArea::stopBlinkingCursor()
 274 {
 275         cursor_timeout_.stop();
 276         hideCursor();
 277 }
 278
 279
 280 void GuiWorkArea::startBlinkingCursor()
 281 {
 282         showCursor();
 283         cursor_timeout_.start();
 284 }
 285
 286
 287 void GuiWorkArea::redraw()
 288 {
 289         if (!isVisible())
 290                 // No need to redraw in this case.
 291                 return;
 292
 293         // No need to do anything if this is the current view. The BufferView
 294         // metrics are already up to date.
 295         if (lyx_view_ != guiApp->currentView()) {
 296                 // FIXME: it would be nice to optimize for the off-screen case.
 297                 buffer_view_->updateMetrics();
 298                 buffer_view_->cursor().fixIfBroken();
 299         }
 300
 301         updateScrollbar();
 302
 303         // update cursor position, because otherwise it has to wait until
 304         // the blinking interval is over
 305         if (cursor_visible_) {
 306                 hideCursor();
 307                 showCursor();
 308         }
 309
 310         LYXERR(Debug::WORKAREA, "WorkArea::redraw screen");
 311         updateScreen();
 312         update(0, 0, viewport()->width(), viewport()->height());
 313
 314         lyx_view_->updateStatusBar();
 315
 316         if (lyxerr.debugging(Debug::WORKAREA))
 317                 buffer_view_->coordCache().dump();
 318 }
 319
 320
 321 void GuiWorkArea::processKeySym(KeySymbol const & key, KeyModifier mod)
 322 {
 323         // In order to avoid bad surprise in the middle of an operation,
 324         // we better stop the blinking cursor.
 325         stopBlinkingCursor();
 326
 327         theLyXFunc().setLyXView(lyx_view_);
 328         theLyXFunc().processKeySym(key, mod);
 329 }
 330
 331
 332 void GuiWorkArea::dispatch(FuncRequest const & cmd0, KeyModifier mod)
 333 {
 334         // Handle drag&drop
 335         if (cmd0.action == LFUN_FILE_OPEN) {
 336                 lyx_view_->dispatch(cmd0);
 337                 return;
 338         }
 339
 340         theLyXFunc().setLyXView(lyx_view_);
 341
 342         FuncRequest cmd;
 343
 344         if (cmd0.action == LFUN_MOUSE_PRESS) {
 345                 if (mod == ShiftModifier)
 346                         cmd = FuncRequest(cmd0, "region-select");
 347                 else if (mod == ControlModifier)
 348                         cmd = FuncRequest(cmd0, "paragraph-select");
 349                 else
 350                         cmd = cmd0;
 351         }
 352         else
 353                 cmd = cmd0;
 354
 355         // In order to avoid bad surprise in the middle of an operation, we better stop
 356         // the blinking cursor.
 357         if (!(cmd.action == LFUN_MOUSE_MOTION
 358                 && cmd.button() == mouse_button::none))
 359                 stopBlinkingCursor();
 360
 361         buffer_view_->mouseEventDispatch(cmd);
 362
 363         // Skip these when selecting
 364         if (cmd.action != LFUN_MOUSE_MOTION) {
 365                 lyx_view_->updateLayoutList();
 366                 lyx_view_->updateToolbars();
 367         }
 368
 369         // GUI tweaks except with mouse motion with no button pressed.
 370         if (!(cmd.action == LFUN_MOUSE_MOTION
 371                 && cmd.button() == mouse_button::none)) {
 372                 // Slight hack: this is only called currently when we
 373                 // clicked somewhere, so we force through the display
 374                 // of the new status here.
 375                 lyx_view_->clearMessage();
 376
 377                 // Show the cursor immediately after any operation.
 378                 startBlinkingCursor();
 379         }
 380 }
 381
 382
 383 void GuiWorkArea::resizeBufferView()
 384 {
 385         // WARNING: Please don't put any code that will trigger a repaint here!
 386         // We are already inside a paint event.
 387         lyx_view_->setBusy(true);
 388         buffer_view_->resize(viewport()->width(), viewport()->height());
 389         lyx_view_->updateLayoutList();
 390         lyx_view_->setBusy(false);
 391         need_resize_ = false;
 392 }
 393
 394
 395 void GuiWorkArea::showCursor()
 396 {
 397         if (cursor_visible_)
 398                 return;
 399
 400         CursorShape shape = BAR_SHAPE;
 401
 402         Font const & realfont = buffer_view_->cursor().real_current_font;
 403         BufferParams const & bp = buffer_view_->buffer().params();
 404         bool const samelang = realfont.language() == bp.language;
 405         bool const isrtl = realfont.isVisibleRightToLeft();
 406
 407         if (!samelang || isrtl != bp.language->rightToLeft()) {
 408                 shape = L_SHAPE;
 409                 if (isrtl)
 410                         shape = REVERSED_L_SHAPE;
 411         }
 412
 413         // The ERT language hack needs fixing up
 414         if (realfont.language() == latex_language)
 415                 shape = BAR_SHAPE;
 416
 417         Font const font = buffer_view_->cursor().getFont();
 418         FontMetrics const & fm = theFontMetrics(font);
 419         int const asc = fm.maxAscent();
 420         int const des = fm.maxDescent();
 421         int h = asc + des;
 422         int x = 0;
 423         int y = 0;
 424         buffer_view_->cursor().getPos(x, y);
 425         y -= asc;
 426
 427         // if it doesn't touch the screen, don't try to show it
 428         if (y + h < 0 || y >= viewport()->height())
 429                 return;
 430
 431         cursor_visible_ = true;
 432         showCursor(x, y, h, shape);
 433 }
 434
 435
 436 void GuiWorkArea::hideCursor()
 437 {
 438         if (!cursor_visible_)
 439                 return;
 440
 441         cursor_visible_ = false;
 442         removeCursor();
 443 }
 444
 445
 446 void GuiWorkArea::toggleCursor()
 447 {
 448         if (cursor_visible_)
 449                 hideCursor();
 450         else
 451                 showCursor();
 452
 453         // Use this opportunity to deal with any child processes that
 454         // have finished but are waiting to communicate this fact
 455         // to the rest of LyX.
 456         support::ForkedCallsController::handleCompletedProcesses();
 457 }
 458
 459
 460 void GuiWorkArea::updateScrollbar()
 461 {
 462         verticalScrollBar()->setTracking(false);
 463
 464         buffer_view_->updateScrollbar();
 465         ScrollbarParameters const & scroll_ = buffer_view_->scrollbarParameters();
 466
 467         // do what cursor movement does (some grey)
 468         int const h = scroll_.height + viewport()->height() / 4;
 469         int scroll_max_ = std::max(0, h - viewport()->height());
 470
 471         verticalScrollBar()->setRange(0, scroll_max_);
 472         verticalScrollBar()->setSliderPosition(scroll_.position);
 473         verticalScrollBar()->setSingleStep(scroll_.lineScrollHeight);
 474         verticalScrollBar()->setValue(scroll_.position);
 475
 476         verticalScrollBar()->setTracking(true);
 477 }
 478
 479
 480 void GuiWorkArea::adjustViewWithScrollBar(int action)
 481 {
 482         stopBlinkingCursor();
 483         if (action == QAbstractSlider::SliderPageStepAdd)
 484                 buffer_view_->scrollDown(viewport()->height());
 485         else if (action == QAbstractSlider::SliderPageStepSub)
 486                 buffer_view_->scrollUp(viewport()->height());
 487         else
 488                 buffer_view_->scrollDocView(verticalScrollBar()->sliderPosition());
 489
 490         if (lyxrc.cursor_follows_scrollbar) {
 491                 buffer_view_->setCursorFromScrollbar();
 492                 lyx_view_->updateLayoutList();
 493         }
 494         // Show the cursor immediately after any operation.
 495         startBlinkingCursor();
 496         QApplication::syncX();
 497 }
 498
 499
 500 void GuiWorkArea::focusInEvent(QFocusEvent * /*event*/)
 501 {
 502         // Repaint the whole screen.
 503         // Note: this is different from redraw() as only the backing pixmap
 504         // will be redrawn, which is cheap.
 505         viewport()->repaint();
 506
 507         startBlinkingCursor();
 508 }
 509
 510
 511 void GuiWorkArea::focusOutEvent(QFocusEvent * /*event*/)
 512 {
 513         stopBlinkingCursor();
 514 }
 515
 516
 517 void GuiWorkArea::mousePressEvent(QMouseEvent * e)
 518 {
 519         if (dc_event_.active && dc_event_ == *e) {
 520                 dc_event_.active = false;
 521                 FuncRequest cmd(LFUN_MOUSE_TRIPLE, e->x(), e->y(),
 522                         q_button_state(e->button()));
 523                 dispatch(cmd);
 524                 return;
 525         }
 526
 527         inputContext()->reset();
 528
 529         FuncRequest const cmd(LFUN_MOUSE_PRESS, e->x(), e->y(),
 530                 q_button_state(e->button()));
 531         dispatch(cmd, q_key_state(e->modifiers()));
 532 }
 533
 534
 535 void GuiWorkArea::mouseReleaseEvent(QMouseEvent * e)
 536 {
 537         if (synthetic_mouse_event_.timeout.running())
 538                 synthetic_mouse_event_.timeout.stop();
 539
 540         FuncRequest const cmd(LFUN_MOUSE_RELEASE, e->x(), e->y(),
 541                               q_button_state(e->button()));
 542         dispatch(cmd);
 543 }
 544
 545
 546 void GuiWorkArea::mouseMoveEvent(QMouseEvent * e)
 547 {
 548         // we kill the triple click if we move
 549         doubleClickTimeout();
 550         FuncRequest cmd(LFUN_MOUSE_MOTION, e->x(), e->y(),
 551                               q_motion_state(e->buttons()));
 552
 553         // If we're above or below the work area...
 554         if (e->y() <= 20 || e->y() >= viewport()->height() - 20) {
 555                 // Make sure only a synthetic event can cause a page scroll,
 556                 // so they come at a steady rate:
 557                 if (e->y() <= 20)
 558                         // _Force_ a scroll up:
 559                         cmd.y = -40;
 560                 else
 561                         cmd.y = viewport()->height();
 562                 // Store the event, to be handled when the timeout expires.
 563                 synthetic_mouse_event_.cmd = cmd;
 564
 565                 if (synthetic_mouse_event_.timeout.running())
 566                         // Discard the event. Note that it _may_ be handled
 567                         // when the timeout expires if
 568                         // synthetic_mouse_event_.cmd has not been overwritten.
 569                         // Ie, when the timeout expires, we handle the
 570                         // most recent event but discard all others that
 571                         // occurred after the one used to start the timeout
 572                         // in the first place.
 573                         return;
 574                 else {
 575                         synthetic_mouse_event_.restart_timeout = true;
 576                         synthetic_mouse_event_.timeout.start();
 577                         // Fall through to handle this event...
 578                 }
 579
 580         } else if (synthetic_mouse_event_.timeout.running()) {
 581                 // Store the event, to be possibly handled when the timeout
 582                 // expires.
 583                 // Once the timeout has expired, normal control is returned
 584                 // to mouseMoveEvent (restart_timeout = false).
 585                 // This results in a much smoother 'feel' when moving the
 586                 // mouse back into the work area.
 587                 synthetic_mouse_event_.cmd = cmd;
 588                 synthetic_mouse_event_.restart_timeout = false;
 589                 return;
 590         }
 591
 592         // Has anything changed on-screen since the last QMouseEvent
 593         // was received?
 594         double const scrollbar_value = verticalScrollBar()->value();
 595         if (e->x() != synthetic_mouse_event_.x_old ||
 596             e->y() != synthetic_mouse_event_.y_old ||
 597             scrollbar_value != synthetic_mouse_event_.scrollbar_value_old) {
 598                 // Yes it has. Store the params used to check this.
 599                 synthetic_mouse_event_.x_old = e->x();
 600                 synthetic_mouse_event_.y_old = e->y();
 601                 synthetic_mouse_event_.scrollbar_value_old = scrollbar_value;
 602
 603                 // ... and dispatch the event to the LyX core.
 604                 dispatch(cmd);
 605         }
 606 }
 607
 608
 609 void GuiWorkArea::wheelEvent(QWheelEvent * e)
 610 {
 611         // Wheel rotation by one notch results in a delta() of 120 (see
 612         // documentation of QWheelEvent)
 613         int const lines = qApp->wheelScrollLines() * e->delta() / 120;
 614         verticalScrollBar()->setValue(verticalScrollBar()->value() -
 615                         lines *  verticalScrollBar()->singleStep());
 616         adjustViewWithScrollBar();
 617 }
 618
 619
 620 void GuiWorkArea::generateSyntheticMouseEvent()
 621 {
 622 // Set things off to generate the _next_ 'pseudo' event.
 623         if (synthetic_mouse_event_.restart_timeout)
 624                 synthetic_mouse_event_.timeout.start();
 625
 626         // Has anything changed on-screen since the last timeout signal
 627         // was received?
 628         double const scrollbar_value = verticalScrollBar()->value();
 629         if (scrollbar_value != synthetic_mouse_event_.scrollbar_value_old) {
 630                 // Yes it has. Store the params used to check this.
 631                 synthetic_mouse_event_.scrollbar_value_old = scrollbar_value;
 632
 633                 // ... and dispatch the event to the LyX core.
 634                 dispatch(synthetic_mouse_event_.cmd);
 635         }
 636 }
 637
 638
 639 void GuiWorkArea::keyPressEvent(QKeyEvent * ev)
 640 {
 641         // do nothing if there are other events
 642         // (the auto repeated events come too fast)
 643         // \todo FIXME: remove hard coded Qt keys, process the key binding
 644 #ifdef Q_WS_X11
 645         if (XEventsQueued(QX11Info::display(), 0) > 1 && ev->isAutoRepeat()
 646                         && (Qt::Key_PageDown || Qt::Key_PageUp)) {
 647                 LYXERR(Debug::KEY, "system is busy: scroll key event ignored");
 648                 ev->ignore();
 649                 return;
 650         }
 651 #endif
 652
 653         LYXERR(Debug::KEY, " count: " << ev->count()
 654                 << " text: " << fromqstr(ev->text())
 655                 << " isAutoRepeat: " << ev->isAutoRepeat() << " key: " << ev->key());
 656
 657         KeySymbol sym;
 658         setKeySymbol(&sym, ev);
 659         processKeySym(sym, q_key_state(ev->modifiers()));
 660 }
 661
 662
 663 void GuiWorkArea::doubleClickTimeout()
 664 {
 665         dc_event_.active = false;
 666 }
 667
 668
 669 void GuiWorkArea::mouseDoubleClickEvent(QMouseEvent * ev)
 670 {
 671         dc_event_ = DoubleClick(ev);
 672         QTimer::singleShot(QApplication::doubleClickInterval(), this,
 673                            SLOT(doubleClickTimeout()));
 674         FuncRequest cmd(LFUN_MOUSE_DOUBLE,
 675                         ev->x(), ev->y(),
 676                         q_button_state(ev->button()));
 677         dispatch(cmd);
 678 }
 679
 680
 681 void GuiWorkArea::resizeEvent(QResizeEvent * ev)
 682 {
 683         QAbstractScrollArea::resizeEvent(ev);
 684         need_resize_ = true;
 685 }
 686
 687
 688 void GuiWorkArea::update(int x, int y, int w, int h)
 689 {
 690         viewport()->repaint(x, y, w, h);
 691 }
 692
 693
 694 void GuiWorkArea::paintEvent(QPaintEvent * ev)
 695 {
 696         QRect const rc = ev->rect();
 697         // LYXERR(Debug::PAINTING, "paintEvent begin: x: " << rc.x()
 698         //      << " y: " << rc.y() << " w: " << rc.width() << " h: " << rc.height());
 699
 700         if (need_resize_) {
 701                 verticalScrollBar()->setPageStep(viewport()->height());
 702                 screen_ = QPixmap(viewport()->width(), viewport()->height());
 703                 resizeBufferView();
 704                 updateScreen();
 705                 hideCursor();
 706                 showCursor();
 707         }
 708
 709         QPainter pain(viewport());
 710         pain.drawPixmap(rc, screen_, rc);
 711         cursor_->draw(pain);
 712 }
 713
 714
 715 void GuiWorkArea::updateScreen()
 716 {
 717         GuiPainter pain(&screen_);
 718         buffer_view_->draw(pain);
 719 }
 720
 721
 722 void GuiWorkArea::showCursor(int x, int y, int h, CursorShape shape)
 723 {
 724         if (schedule_redraw_) {
 725                 buffer_view_->updateMetrics();
 726                 updateScreen();
 727                 viewport()->update(QRect(0, 0, viewport()->width(), viewport()->height()));
 728                 schedule_redraw_ = false;
 729                 // Show the cursor immediately after the update.
 730                 hideCursor();
 731                 toggleCursor();
 732                 return;
 733         }
 734
 735         cursor_->update(x, y, h, shape);
 736         cursor_->show();
 737         viewport()->update(cursor_->rect());
 738 }
 739
 740
 741 void GuiWorkArea::removeCursor()
 742 {
 743         cursor_->hide();
 744         //if (!qApp->focusWidget())
 745                 viewport()->update(cursor_->rect());
 746 }
 747
 748
 749 void GuiWorkArea::inputMethodEvent(QInputMethodEvent * e)
 750 {
 751         QString const & commit_string = e->commitString();
 752         docstring const & preedit_string
 753                 = qstring_to_ucs4(e->preeditString());
 754
 755         if (!commit_string.isEmpty()) {
 756
 757                 LYXERR(Debug::KEY, "preeditString: " << fromqstr(e->preeditString())
 758                         << " commitString: " << fromqstr(e->commitString()));
 759
 760                 int key = 0;
 761
 762                 // FIXME Iwami 04/01/07: we should take care also of UTF16 surrogates here.
 763                 for (int i = 0; i != commit_string.size(); ++i) {
 764                         QKeyEvent ev(QEvent::KeyPress, key, Qt::NoModifier, commit_string[i]);
 765                         keyPressEvent(&ev);
 766                 }
 767         }
 768
 769         // Hide the cursor during the kana-kanji transformation.
 770         if (preedit_string.empty())
 771                 startBlinkingCursor();
 772         else
 773                 stopBlinkingCursor();
 774
 775         // last_width : for checking if last preedit string was/wasn't empty.
 776         static bool last_width = false;
 777         if (!last_width && preedit_string.empty()) {
 778                 // if last_width is last length of preedit string.
 779                 e->accept();
 780                 return;
 781         }
 782
 783         GuiPainter pain(&screen_);
 784         buffer_view_->updateMetrics();
 785         buffer_view_->draw(pain);
 786         FontInfo font = buffer_view_->cursor().getFont().fontInfo();
 787         FontMetrics const & fm = theFontMetrics(font);
 788         int height = fm.maxHeight();
 789         int cur_x = cursor_->rect().left();
 790         int cur_y = cursor_->rect().bottom();
 791
 792         // redraw area of preedit string.
 793         update(0, cur_y - height, viewport()->width(),
 794                 (height + 1) * preedit_lines_);
 795
 796         if (preedit_string.empty()) {
 797                 last_width = false;
 798                 preedit_lines_ = 1;
 799                 e->accept();
 800                 return;
 801         }
 802         last_width = true;
 803
 804         // att : stores an IM attribute.
 805         QList<QInputMethodEvent::Attribute> const & att = e->attributes();
 806
 807         // get attributes of input method cursor.
 808         // cursor_pos : cursor position in preedit string.
 809         size_t cursor_pos = 0;
 810         bool cursor_is_visible = false;
 811         for (int i = 0; i != att.size(); ++i) {
 812                 if (att.at(i).type == QInputMethodEvent::Cursor) {
 813                         cursor_pos = att.at(i).start;
 814                         cursor_is_visible = att.at(i).length != 0;
 815                         break;
 816                 }
 817         }
 818
 819         size_t preedit_length = preedit_string.length();
 820
 821         // get position of selection in input method.
 822         // FIXME: isn't there a way to do this simplier?
 823         // rStart : cursor position in selected string in IM.
 824         size_t rStart = 0;
 825         // rLength : selected string length in IM.
 826         size_t rLength = 0;
 827         if (cursor_pos < preedit_length) {
 828                 for (int i = 0; i != att.size(); ++i) {
 829                         if (att.at(i).type == QInputMethodEvent::TextFormat) {
 830                                 if (att.at(i).start <= int(cursor_pos)
 831                                         && int(cursor_pos) < att.at(i).start + att.at(i).length) {
 832                                                 rStart = att.at(i).start;
 833                                                 rLength = att.at(i).length;
 834                                                 if (!cursor_is_visible)
 835                                                         cursor_pos += rLength;
 836                                                 break;
 837                                 }
 838                         }
 839                 }
 840         }
 841         else {
 842                 rStart = cursor_pos;
 843                 rLength = 0;
 844         }
 845
 846         int const right_margin = rightMargin();
 847         Painter::preedit_style ps;
 848         // Most often there would be only one line:
 849         preedit_lines_ = 1;
 850         for (size_t pos = 0; pos != preedit_length; ++pos) {
 851                 char_type const typed_char = preedit_string[pos];
 852                 // reset preedit string style
 853                 ps = Painter::preedit_default;
 854
 855                 // if we reached the right extremity of the screen, go to next line.
 856                 if (cur_x + fm.width(typed_char) > viewport()->width() - right_margin) {
 857                         cur_x = right_margin;
 858                         cur_y += height + 1;
 859                         ++preedit_lines_;
 860                 }
 861                 // preedit strings are displayed with dashed underline
 862                 // and partial strings are displayed white on black indicating
 863                 // that we are in selecting mode in the input method.
 864                 // FIXME: rLength == preedit_length is not a changing condition
 865                 // FIXME: should be put out of the loop.
 866                 if (pos >= rStart
 867                         && pos < rStart + rLength
 868                         && !(cursor_pos < rLength && rLength == preedit_length))
 869                         ps = Painter::preedit_selecting;
 870
 871                 if (pos == cursor_pos
 872                         && (cursor_pos < rLength && rLength == preedit_length))
 873                         ps = Painter::preedit_cursor;
 874
 875                 // draw one character and update cur_x.
 876                 cur_x += pain.preeditText(cur_x, cur_y, typed_char, font, ps);
 877         }
 878
 879         // update the preedit string screen area.
 880         update(0, cur_y - preedit_lines_*height, viewport()->width(),
 881                 (height + 1) * preedit_lines_);
 882
 883         // Don't forget to accept the event!
 884         e->accept();
 885 }
 886
 887
 888 QVariant GuiWorkArea::inputMethodQuery(Qt::InputMethodQuery query) const
 889 {
 890         QRect cur_r(0,0,0,0);
 891         switch (query) {
 892                 // this is the CJK-specific composition window position.
 893                 case Qt::ImMicroFocus:
 894                         cur_r = cursor_->rect();
 895                         if (preedit_lines_ != 1)
 896                                 cur_r.moveLeft(10);
 897                         cur_r.moveBottom(cur_r.bottom() + cur_r.height() * preedit_lines_);
 898                         // return lower right of cursor in LyX.
 899                         return cur_r;
 900                 default:
 901                         return QWidget::inputMethodQuery(query);
 902         }
 903 }
 904
 905
 906 void GuiWorkArea::updateWindowTitle()
 907 {
 908         docstring maximize_title;
 909         docstring minimize_title;
 910
 911         Buffer & buf = buffer_view_->buffer();
 912         FileName const fileName = buf.fileName();
 913         if (!fileName.empty()) {
 914                 maximize_title = fileName.displayName(30);
 915                 minimize_title = from_utf8(fileName.onlyFileName());
 916                 if (!buf.isClean()) {
 917                         maximize_title += _(" (changed)");
 918                         minimize_title += char_type('*');
 919                 }
 920                 if (buf.isReadonly())
 921                         maximize_title += _(" (read only)");
 922         }
 923
 924         QString title = windowTitle();
 925         QString new_title = toqstr(maximize_title);
 926         if (title == new_title)
 927                 return;
 928
 929         QWidget::setWindowTitle(new_title);
 930         QWidget::setWindowIconText(toqstr(minimize_title));
 931         titleChanged(this);
 932 }
 933
 934
 935 void GuiWorkArea::setReadOnly(bool)
 936 {
 937         updateWindowTitle();
 938         if (this == lyx_view_->currentWorkArea())
 939                 lyx_view_->updateBufferDependent(false);
 940 }
 941
 942
 943 ////////////////////////////////////////////////////////////////////
 944 //
 945 // TabWorkArea
 946 //
 947 ////////////////////////////////////////////////////////////////////
 948
 949 TabWorkArea::TabWorkArea(QWidget * parent) : QTabWidget(parent)
 950 {
 951         QPalette pal = palette();
 952         pal.setColor(QPalette::Active, QPalette::Button,
 953                 pal.color(QPalette::Active, QPalette::Window));
 954         pal.setColor(QPalette::Disabled, QPalette::Button,
 955                 pal.color(QPalette::Disabled, QPalette::Window));
 956         pal.setColor(QPalette::Inactive, QPalette::Button,
 957                 pal.color(QPalette::Inactive, QPalette::Window));
 958
 959         QToolButton * closeTabButton = new QToolButton(this);
 960     closeTabButton->setPalette(pal);
 961         closeTabButton->setIcon(QIcon(":/images/closetab.png"));
 962         closeTabButton->setText("Close");
 963         closeTabButton->setAutoRaise(true);
 964         closeTabButton->setCursor(Qt::ArrowCursor);
 965         closeTabButton->setToolTip(tr("Close tab"));
 966         closeTabButton->setEnabled(true);
 967
 968         QObject::connect(this, SIGNAL(currentChanged(int)),
 969                 this, SLOT(on_currentTabChanged(int)));
 970         QObject::connect(closeTabButton, SIGNAL(clicked()),
 971                 this, SLOT(closeCurrentTab()));
 972
 973         setCornerWidget(closeTabButton);
 974         setUsesScrollButtons(true);
 975 }
 976
 977
 978 void TabWorkArea::showBar(bool show)
 979 {
 980         tabBar()->setEnabled(show);
 981         tabBar()->setVisible(show);
 982 }
 983
 984
 985 GuiWorkArea * TabWorkArea::currentWorkArea()
 986 {
 987         if (count() == 0)
 988                 return 0;
 989
 990         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(currentWidget());
 991         BOOST_ASSERT(wa);
 992         return wa;
 993 }
 994
 995
 996 GuiWorkArea * TabWorkArea::workArea(Buffer & buffer)
 997 {
 998         for (int i = 0; i != count(); ++i) {
 999                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i));
1000                 BOOST_ASSERT(wa);
1001                 if (&wa->bufferView().buffer() == &buffer)
1002                         return wa;
1003         }
1004         return 0;
1005 }
1006
1007
1008 void TabWorkArea::closeAll()
1009 {
1010         while (count()) {
1011                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(0));
1012                 BOOST_ASSERT(wa);
1013                 removeTab(0);
1014                 delete wa;
1015         }
1016 }
1017
1018
1019 bool TabWorkArea::setCurrentWorkArea(GuiWorkArea * work_area)
1020 {
1021         BOOST_ASSERT(work_area);
1022         int index = indexOf(work_area);
1023         if (index == -1)
1024                 return false;
1025
1026         if (index == currentIndex())
1027                 // Make sure the work area is up to date.
1028                 on_currentTabChanged(index);
1029         else
1030                 // Switch to the work area.
1031                 setCurrentIndex(index);
1032         work_area->setFocus();
1033
1034         return true;
1035 }
1036
1037
1038 GuiWorkArea * TabWorkArea::addWorkArea(Buffer & buffer, GuiView & view)
1039 {
1040         GuiWorkArea * wa = new GuiWorkArea(buffer, view);
1041         wa->setUpdatesEnabled(false);
1042         // Hide tabbar if there's no tab (avoid a resize and a flashing tabbar
1043         // when hiding it again below).
1044         showBar(count() > 0);
1045         addTab(wa, wa->windowTitle());
1046         QObject::connect(wa, SIGNAL(titleChanged(GuiWorkArea *)),
1047                 this, SLOT(updateTabText(GuiWorkArea *)));
1048         // Hide tabbar if there's only one tab.
1049         showBar(count() > 1);
1050         return wa;
1051 }
1052
1053
1054 bool TabWorkArea::removeWorkArea(GuiWorkArea * work_area)
1055 {
1056         BOOST_ASSERT(work_area);
1057         int index = indexOf(work_area);
1058         if (index == -1)
1059                 return false;
1060
1061         work_area->setUpdatesEnabled(false);
1062         removeTab(index);
1063         delete work_area;
1064
1065         if (count()) {
1066                 // make sure the next work area is enabled.
1067                 currentWidget()->setUpdatesEnabled(true);
1068                 // Hide tabbar if there's only one tab.
1069                 showBar(count() > 1);
1070         }
1071         return true;
1072 }
1073
1074
1075 void TabWorkArea::on_currentTabChanged(int i)
1076 {
1077         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i));
1078         BOOST_ASSERT(wa);
1079         BufferView & bv = wa->bufferView();
1080         bv.cursor().fixIfBroken();
1081         bv.updateMetrics();
1082         wa->setUpdatesEnabled(true);
1083         wa->redraw();
1084         wa->setFocus();
1085         ///
1086         currentWorkAreaChanged(wa);
1087
1088         LYXERR(Debug::GUI, "currentTabChanged " << i
1089                 << "File" << bv.buffer().absFileName());
1090 }
1091
1092
1093 void TabWorkArea::closeCurrentTab()
1094 {
1095         lyx::dispatch(FuncRequest(LFUN_BUFFER_CLOSE));
1096 }
1097
1098
1099 void TabWorkArea::updateTabText(GuiWorkArea * wa)
1100 {
1101         int const i = indexOf(wa);
1102         if (i < 0)
1103                 return;
1104         setTabText(i, wa->windowTitle());
1105 }
1106
1107 } // namespace frontend
1108 } // namespace lyx
1109
1110 #include "GuiWorkArea_moc.cpp"