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 #include <boost/current_function.hpp>
  59
  60 #ifdef Q_WS_X11
  61 #include <QX11Info>
  62 extern "C" int XEventsQueued(Display *display, int mode);
  63 #endif
  64
  65 #ifdef Q_WS_WIN
  66 int const CursorWidth = 2;
  67 #else
  68 int const CursorWidth = 1;
  69 #endif
  70
  71 #undef KeyPress
  72 #undef NoModifier
  73
  74 using std::endl;
  75 using std::min;
  76 using std::max;
  77 using std::string;
  78
  79 namespace lyx {
  80
  81 using support::FileName;
  82
  83
  84 /// return the LyX mouse button state from Qt's
  85 static mouse_button::state q_button_state(Qt::MouseButton button)
  86 {
  87         mouse_button::state b = mouse_button::none;
  88         switch (button) {
  89                 case Qt::LeftButton:
  90                         b = mouse_button::button1;
  91                         break;
  92                 case Qt::MidButton:
  93                         b = mouse_button::button2;
  94                         break;
  95                 case Qt::RightButton:
  96                         b = mouse_button::button3;
  97                         break;
  98                 default:
  99                         break;
 100         }
 101         return b;
 102 }
 103
 104
 105 /// return the LyX mouse button state from Qt's
 106 mouse_button::state q_motion_state(Qt::MouseButtons state)
 107 {
 108         mouse_button::state b = mouse_button::none;
 109         if (state & Qt::LeftButton)
 110                 b |= mouse_button::button1;
 111         if (state & Qt::MidButton)
 112                 b |= mouse_button::button2;
 113         if (state & Qt::RightButton)
 114                 b |= mouse_button::button3;
 115         return b;
 116 }
 117
 118
 119 namespace frontend {
 120
 121 class CursorWidget {
 122 public:
 123         CursorWidget() {}
 124
 125         void draw(QPainter & painter)
 126         {
 127                 if (show_ && rect_.isValid()) {
 128                         switch (shape_) {
 129                         case L_SHAPE:
 130                                 painter.fillRect(rect_.x(), rect_.y(), CursorWidth, rect_.height(), color_);
 131                                 painter.setPen(color_);
 132                                 painter.drawLine(rect_.bottomLeft().x() + CursorWidth, rect_.bottomLeft().y(),
 133                                                                                                  rect_.bottomRight().x(), rect_.bottomLeft().y());
 134                                 break;
 135
 136                         case REVERSED_L_SHAPE:
 137                                 painter.fillRect(rect_.x() + rect_.height() / 3, rect_.y(), CursorWidth, rect_.height(), color_);
 138                                 painter.setPen(color_);
 139                                 painter.drawLine(rect_.bottomRight().x() - CursorWidth, rect_.bottomLeft().y(),
 140                                                                                                          rect_.bottomLeft().x(), rect_.bottomLeft().y());
 141                                 break;
 142
 143                         default:
 144                                 painter.fillRect(rect_, color_);
 145                                 break;
 146                         }
 147                 }
 148         }
 149
 150         void update(int x, int y, int h, CursorShape shape)
 151         {
 152                 color_ = guiApp->colorCache().get(Color_cursor);
 153                 shape_ = shape;
 154                 switch (shape) {
 155                 case L_SHAPE:
 156                         rect_ = QRect(x, y, CursorWidth + h / 3, h);
 157                         break;
 158                 case REVERSED_L_SHAPE:
 159                         rect_ = QRect(x - h / 3, y, CursorWidth + h / 3, h);
 160                         break;
 161                 default:
 162                         rect_ = QRect(x, y, CursorWidth, h);
 163                         break;
 164                 }
 165         }
 166
 167         void show(bool set_show = true) { show_ = set_show; }
 168         void hide() { show_ = false; }
 169
 170         QRect const & rect() { return rect_; }
 171
 172 private:
 173         ///
 174         CursorShape shape_;
 175         ///
 176         bool show_;
 177         ///
 178         QColor color_;
 179         ///
 180         QRect rect_;
 181 };
 182
 183
 184 // This is a 'heartbeat' generating synthetic mouse move events when the
 185 // cursor is at the top or bottom edge of the viewport. One scroll per 0.2 s
 186 SyntheticMouseEvent::SyntheticMouseEvent()
 187         : timeout(200), restart_timeout(true),
 188           x_old(-1), y_old(-1), scrollbar_value_old(-1.0)
 189 {}
 190
 191
 192
 193 GuiWorkArea::GuiWorkArea(Buffer & buffer, GuiView & lv)
 194         : buffer_view_(new BufferView(buffer)), lyx_view_(&lv),
 195           cursor_visible_(false),
 196     need_resize_(false), schedule_redraw_(false),
 197                 preedit_lines_(1)
 198 {
 199         buffer.workAreaManager().add(this);
 200         // Setup the signals
 201         cursor_timeout_.setInterval(400);
 202         connect(&cursor_timeout_, SIGNAL(timeout()),
 203                 this, SLOT(toggleCursor()));
 204
 205         cursor_timeout_.start();
 206
 207         screen_ = QPixmap(viewport()->width(), viewport()->height());
 208         cursor_ = new frontend::CursorWidget();
 209         cursor_->hide();
 210
 211         setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
 212         setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 213         setAcceptDrops(true);
 214         setMouseTracking(true);
 215         setMinimumSize(100, 70);
 216         updateWindowTitle();
 217
 218         viewport()->setAutoFillBackground(false);
 219         // We don't need double-buffering nor SystemBackground on
 220         // the viewport because we have our own backing pixmap.
 221         viewport()->setAttribute(Qt::WA_NoSystemBackground);
 222
 223         setFocusPolicy(Qt::WheelFocus);
 224
 225         viewport()->setCursor(Qt::IBeamCursor);
 226
 227         synthetic_mouse_event_.timeout.timeout.connect(
 228                 boost::bind(&GuiWorkArea::generateSyntheticMouseEvent,
 229                                         this));
 230
 231         // Initialize the vertical Scroll Bar
 232         QObject::connect(verticalScrollBar(), SIGNAL(actionTriggered(int)),
 233                 this, SLOT(adjustViewWithScrollBar(int)));
 234
 235         // disable context menu for the scrollbar
 236         verticalScrollBar()->setContextMenuPolicy(Qt::NoContextMenu);
 237
 238         // PageStep only depends on the viewport height.
 239         verticalScrollBar()->setPageStep(viewport()->height());
 240
 241         LYXERR(Debug::GUI, BOOST_CURRENT_FUNCTION
 242                 << "\n viewport width\t" << viewport()->width()
 243                 << "\n viewport height\t" << viewport()->height());
 244
 245         // Enables input methods for asian languages.
 246         // Must be set when creating custom text editing widgets.
 247         setAttribute(Qt::WA_InputMethodEnabled, true);
 248 }
 249
 250
 251
 252 GuiWorkArea::~GuiWorkArea()
 253 {
 254         buffer_view_->buffer().workAreaManager().remove(this);
 255         delete buffer_view_;
 256 }
 257
 258
 259 void GuiWorkArea::close()
 260 {
 261         lyx_view_->removeWorkArea(this);
 262 }
 263
 264
 265 BufferView & GuiWorkArea::bufferView()
 266 {
 267         return *buffer_view_;
 268 }
 269
 270
 271 BufferView const & GuiWorkArea::bufferView() const
 272 {
 273         return *buffer_view_;
 274 }
 275
 276
 277 void GuiWorkArea::stopBlinkingCursor()
 278 {
 279         cursor_timeout_.stop();
 280         hideCursor();
 281 }
 282
 283
 284 void GuiWorkArea::startBlinkingCursor()
 285 {
 286         showCursor();
 287         cursor_timeout_.start();
 288 }
 289
 290
 291 void GuiWorkArea::redraw()
 292 {
 293         if (!isVisible())
 294                 // No need to redraw in this case.
 295                 return;
 296
 297         // No need to do anything if this is the current view. The BufferView
 298         // metrics are already up to date.
 299         if (lyx_view_ != guiApp->currentView()) {
 300                 // FIXME: it would be nice to optimize for the off-screen case.
 301                 buffer_view_->updateMetrics();
 302                 buffer_view_->cursor().fixIfBroken();
 303         }
 304
 305         updateScrollbar();
 306
 307         // update cursor position, because otherwise it has to wait until
 308         // the blinking interval is over
 309         if (cursor_visible_) {
 310                 hideCursor();
 311                 showCursor();
 312         }
 313
 314         LYXERR(Debug::WORKAREA, "WorkArea::redraw screen");
 315         updateScreen();
 316         update(0, 0, viewport()->width(), viewport()->height());
 317
 318         lyx_view_->updateStatusBar();
 319
 320         if (lyxerr.debugging(Debug::WORKAREA))
 321                 buffer_view_->coordCache().dump();
 322 }
 323
 324
 325 void GuiWorkArea::processKeySym(KeySymbol const & key, KeyModifier mod)
 326 {
 327         // In order to avoid bad surprise in the middle of an operation,
 328         // we better stop the blinking cursor.
 329         stopBlinkingCursor();
 330
 331         theLyXFunc().setLyXView(lyx_view_);
 332         theLyXFunc().processKeySym(key, mod);
 333 }
 334
 335
 336 void GuiWorkArea::dispatch(FuncRequest const & cmd0, KeyModifier mod)
 337 {
 338         // Handle drag&drop
 339         if (cmd0.action == LFUN_FILE_OPEN) {
 340                 lyx_view_->dispatch(cmd0);
 341                 return;
 342         }
 343
 344         theLyXFunc().setLyXView(lyx_view_);
 345
 346         FuncRequest cmd;
 347
 348         if (cmd0.action == LFUN_MOUSE_PRESS) {
 349                 if (mod == ShiftModifier)
 350                         cmd = FuncRequest(cmd0, "region-select");
 351                 else if (mod == ControlModifier)
 352                         cmd = FuncRequest(cmd0, "paragraph-select");
 353                 else
 354                         cmd = cmd0;
 355         }
 356         else
 357                 cmd = cmd0;
 358
 359         // In order to avoid bad surprise in the middle of an operation, we better stop
 360         // the blinking cursor.
 361         if (!(cmd.action == LFUN_MOUSE_MOTION
 362                 && cmd.button() == mouse_button::none))
 363                 stopBlinkingCursor();
 364
 365         buffer_view_->mouseEventDispatch(cmd);
 366
 367         // Skip these when selecting
 368         if (cmd.action != LFUN_MOUSE_MOTION) {
 369                 lyx_view_->updateLayoutList();
 370                 lyx_view_->updateToolbars();
 371         }
 372
 373         // GUI tweaks except with mouse motion with no button pressed.
 374         if (!(cmd.action == LFUN_MOUSE_MOTION
 375                 && cmd.button() == mouse_button::none)) {
 376                 // Slight hack: this is only called currently when we
 377                 // clicked somewhere, so we force through the display
 378                 // of the new status here.
 379                 lyx_view_->clearMessage();
 380
 381                 // Show the cursor immediately after any operation.
 382                 startBlinkingCursor();
 383         }
 384 }
 385
 386
 387 void GuiWorkArea::resizeBufferView()
 388 {
 389         // WARNING: Please don't put any code that will trigger a repaint here!
 390         // We are already inside a paint event.
 391         lyx_view_->setBusy(true);
 392         buffer_view_->resize(viewport()->width(), viewport()->height());
 393         lyx_view_->updateLayoutList();
 394         lyx_view_->setBusy(false);
 395         need_resize_ = false;
 396 }
 397
 398
 399 void GuiWorkArea::showCursor()
 400 {
 401         if (cursor_visible_)
 402                 return;
 403
 404         CursorShape shape = BAR_SHAPE;
 405
 406         Font const & realfont = buffer_view_->cursor().real_current_font;
 407         BufferParams const & bp = buffer_view_->buffer().params();
 408         bool const samelang = realfont.language() == bp.language;
 409         bool const isrtl = realfont.isVisibleRightToLeft();
 410
 411         if (!samelang || isrtl != bp.language->rightToLeft()) {
 412                 shape = L_SHAPE;
 413                 if (isrtl)
 414                         shape = REVERSED_L_SHAPE;
 415         }
 416
 417         // The ERT language hack needs fixing up
 418         if (realfont.language() == latex_language)
 419                 shape = BAR_SHAPE;
 420
 421         Font const font = buffer_view_->cursor().getFont();
 422         FontMetrics const & fm = theFontMetrics(font);
 423         int const asc = fm.maxAscent();
 424         int const des = fm.maxDescent();
 425         int h = asc + des;
 426         int x = 0;
 427         int y = 0;
 428         buffer_view_->cursor().getPos(x, y);
 429         y -= asc;
 430
 431         // if it doesn't touch the screen, don't try to show it
 432         if (y + h < 0 || y >= viewport()->height())
 433                 return;
 434
 435         cursor_visible_ = true;
 436         showCursor(x, y, h, shape);
 437 }
 438
 439
 440 void GuiWorkArea::hideCursor()
 441 {
 442         if (!cursor_visible_)
 443                 return;
 444
 445         cursor_visible_ = false;
 446         removeCursor();
 447 }
 448
 449
 450 void GuiWorkArea::toggleCursor()
 451 {
 452         if (cursor_visible_)
 453                 hideCursor();
 454         else
 455                 showCursor();
 456
 457         // Use this opportunity to deal with any child processes that
 458         // have finished but are waiting to communicate this fact
 459         // to the rest of LyX.
 460         support::ForkedCallsController::handleCompletedProcesses();
 461 }
 462
 463
 464 void GuiWorkArea::updateScrollbar()
 465 {
 466         verticalScrollBar()->setTracking(false);
 467
 468         buffer_view_->updateScrollbar();
 469         ScrollbarParameters const & scroll_ = buffer_view_->scrollbarParameters();
 470
 471         // do what cursor movement does (some grey)
 472         int const h = scroll_.height + viewport()->height() / 4;
 473         int scroll_max_ = std::max(0, h - viewport()->height());
 474
 475         verticalScrollBar()->setRange(0, scroll_max_);
 476         verticalScrollBar()->setSliderPosition(scroll_.position);
 477         verticalScrollBar()->setSingleStep(scroll_.lineScrollHeight);
 478         verticalScrollBar()->setValue(scroll_.position);
 479
 480         verticalScrollBar()->setTracking(true);
 481 }
 482
 483
 484 void GuiWorkArea::adjustViewWithScrollBar(int action)
 485 {
 486         stopBlinkingCursor();
 487         if (action == QAbstractSlider::SliderPageStepAdd)
 488                 buffer_view_->scrollDown(viewport()->height());
 489         else if (action == QAbstractSlider::SliderPageStepSub)
 490                 buffer_view_->scrollUp(viewport()->height());
 491         else
 492                 buffer_view_->scrollDocView(verticalScrollBar()->sliderPosition());
 493
 494         if (lyxrc.cursor_follows_scrollbar) {
 495                 buffer_view_->setCursorFromScrollbar();
 496                 lyx_view_->updateLayoutList();
 497         }
 498         // Show the cursor immediately after any operation.
 499         startBlinkingCursor();
 500         QApplication::syncX();
 501 }
 502
 503
 504 void GuiWorkArea::focusInEvent(QFocusEvent * /*event*/)
 505 {
 506         // Repaint the whole screen.
 507         // Note: this is different from redraw() as only the backing pixmap
 508         // will be redrawn, which is cheap.
 509         viewport()->repaint();
 510
 511         startBlinkingCursor();
 512 }
 513
 514
 515 void GuiWorkArea::focusOutEvent(QFocusEvent * /*event*/)
 516 {
 517         stopBlinkingCursor();
 518 }
 519
 520
 521 void GuiWorkArea::mousePressEvent(QMouseEvent * e)
 522 {
 523         if (dc_event_.active && dc_event_ == *e) {
 524                 dc_event_.active = false;
 525                 FuncRequest cmd(LFUN_MOUSE_TRIPLE, e->x(), e->y(),
 526                         q_button_state(e->button()));
 527                 dispatch(cmd);
 528                 return;
 529         }
 530
 531         inputContext()->reset();
 532
 533         FuncRequest const cmd(LFUN_MOUSE_PRESS, e->x(), e->y(),
 534                 q_button_state(e->button()));
 535         dispatch(cmd, q_key_state(e->modifiers()));
 536 }
 537
 538
 539 void GuiWorkArea::mouseReleaseEvent(QMouseEvent * e)
 540 {
 541         if (synthetic_mouse_event_.timeout.running())
 542                 synthetic_mouse_event_.timeout.stop();
 543
 544         FuncRequest const cmd(LFUN_MOUSE_RELEASE, e->x(), e->y(),
 545                               q_button_state(e->button()));
 546         dispatch(cmd);
 547 }
 548
 549
 550 void GuiWorkArea::mouseMoveEvent(QMouseEvent * e)
 551 {
 552         // we kill the triple click if we move
 553         doubleClickTimeout();
 554         FuncRequest cmd(LFUN_MOUSE_MOTION, e->x(), e->y(),
 555                               q_motion_state(e->buttons()));
 556
 557         // If we're above or below the work area...
 558         if (e->y() <= 20 || e->y() >= viewport()->height() - 20) {
 559                 // Make sure only a synthetic event can cause a page scroll,
 560                 // so they come at a steady rate:
 561                 if (e->y() <= 20)
 562                         // _Force_ a scroll up:
 563                         cmd.y = -40;
 564                 else
 565                         cmd.y = viewport()->height();
 566                 // Store the event, to be handled when the timeout expires.
 567                 synthetic_mouse_event_.cmd = cmd;
 568
 569                 if (synthetic_mouse_event_.timeout.running())
 570                         // Discard the event. Note that it _may_ be handled
 571                         // when the timeout expires if
 572                         // synthetic_mouse_event_.cmd has not been overwritten.
 573                         // Ie, when the timeout expires, we handle the
 574                         // most recent event but discard all others that
 575                         // occurred after the one used to start the timeout
 576                         // in the first place.
 577                         return;
 578                 else {
 579                         synthetic_mouse_event_.restart_timeout = true;
 580                         synthetic_mouse_event_.timeout.start();
 581                         // Fall through to handle this event...
 582                 }
 583
 584         } else if (synthetic_mouse_event_.timeout.running()) {
 585                 // Store the event, to be possibly handled when the timeout
 586                 // expires.
 587                 // Once the timeout has expired, normal control is returned
 588                 // to mouseMoveEvent (restart_timeout = false).
 589                 // This results in a much smoother 'feel' when moving the
 590                 // mouse back into the work area.
 591                 synthetic_mouse_event_.cmd = cmd;
 592                 synthetic_mouse_event_.restart_timeout = false;
 593                 return;
 594         }
 595
 596         // Has anything changed on-screen since the last QMouseEvent
 597         // was received?
 598         double const scrollbar_value = verticalScrollBar()->value();
 599         if (e->x() != synthetic_mouse_event_.x_old ||
 600             e->y() != synthetic_mouse_event_.y_old ||
 601             scrollbar_value != synthetic_mouse_event_.scrollbar_value_old) {
 602                 // Yes it has. Store the params used to check this.
 603                 synthetic_mouse_event_.x_old = e->x();
 604                 synthetic_mouse_event_.y_old = e->y();
 605                 synthetic_mouse_event_.scrollbar_value_old = scrollbar_value;
 606
 607                 // ... and dispatch the event to the LyX core.
 608                 dispatch(cmd);
 609         }
 610 }
 611
 612
 613 void GuiWorkArea::wheelEvent(QWheelEvent * e)
 614 {
 615         // Wheel rotation by one notch results in a delta() of 120 (see
 616         // documentation of QWheelEvent)
 617         int const lines = qApp->wheelScrollLines() * e->delta() / 120;
 618         verticalScrollBar()->setValue(verticalScrollBar()->value() -
 619                         lines *  verticalScrollBar()->singleStep());
 620         adjustViewWithScrollBar();
 621 }
 622
 623
 624 void GuiWorkArea::generateSyntheticMouseEvent()
 625 {
 626 // Set things off to generate the _next_ 'pseudo' event.
 627         if (synthetic_mouse_event_.restart_timeout)
 628                 synthetic_mouse_event_.timeout.start();
 629
 630         // Has anything changed on-screen since the last timeout signal
 631         // was received?
 632         double const scrollbar_value = verticalScrollBar()->value();
 633         if (scrollbar_value != synthetic_mouse_event_.scrollbar_value_old) {
 634                 // Yes it has. Store the params used to check this.
 635                 synthetic_mouse_event_.scrollbar_value_old = scrollbar_value;
 636
 637                 // ... and dispatch the event to the LyX core.
 638                 dispatch(synthetic_mouse_event_.cmd);
 639         }
 640 }
 641
 642
 643 void GuiWorkArea::keyPressEvent(QKeyEvent * ev)
 644 {
 645         // do nothing if there are other events
 646         // (the auto repeated events come too fast)
 647         // \todo FIXME: remove hard coded Qt keys, process the key binding
 648 #ifdef Q_WS_X11
 649         if (XEventsQueued(QX11Info::display(), 0) > 1 && ev->isAutoRepeat()
 650                         && (Qt::Key_PageDown || Qt::Key_PageUp)) {
 651                 LYXERR(Debug::KEY, BOOST_CURRENT_FUNCTION
 652                         << "\nsystem is busy: scroll key event ignored");
 653                 ev->ignore();
 654                 return;
 655         }
 656 #endif
 657
 658         LYXERR(Debug::KEY, BOOST_CURRENT_FUNCTION
 659                 << " count=" << ev->count()
 660                 << " text=" << fromqstr(ev->text())
 661                 << " isAutoRepeat=" << ev->isAutoRepeat()
 662                 << " key=" << ev->key());
 663
 664         KeySymbol sym;
 665         setKeySymbol(&sym, ev);
 666         processKeySym(sym, q_key_state(ev->modifiers()));
 667 }
 668
 669
 670 void GuiWorkArea::doubleClickTimeout()
 671 {
 672         dc_event_.active = false;
 673 }
 674
 675
 676 void GuiWorkArea::mouseDoubleClickEvent(QMouseEvent * ev)
 677 {
 678         dc_event_ = DoubleClick(ev);
 679         QTimer::singleShot(QApplication::doubleClickInterval(), this,
 680                            SLOT(doubleClickTimeout()));
 681         FuncRequest cmd(LFUN_MOUSE_DOUBLE,
 682                         ev->x(), ev->y(),
 683                         q_button_state(ev->button()));
 684         dispatch(cmd);
 685 }
 686
 687
 688 void GuiWorkArea::resizeEvent(QResizeEvent * ev)
 689 {
 690         QAbstractScrollArea::resizeEvent(ev);
 691         need_resize_ = true;
 692 }
 693
 694
 695 void GuiWorkArea::update(int x, int y, int w, int h)
 696 {
 697         viewport()->repaint(x, y, w, h);
 698 }
 699
 700
 701 void GuiWorkArea::paintEvent(QPaintEvent * ev)
 702 {
 703         QRect const rc = ev->rect();
 704         /*
 705         LYXERR(Debug::PAINTING) << "paintEvent begin: x: " << rc.x()
 706                 << " y: " << rc.y()
 707                 << " w: " << rc.width()
 708                 << " h: " << rc.height() << endl;
 709         */
 710
 711         if (need_resize_) {
 712                 verticalScrollBar()->setPageStep(viewport()->height());
 713                 screen_ = QPixmap(viewport()->width(), viewport()->height());
 714                 resizeBufferView();
 715                 updateScreen();
 716                 hideCursor();
 717                 showCursor();
 718         }
 719
 720         QPainter pain(viewport());
 721         pain.drawPixmap(rc, screen_, rc);
 722         cursor_->draw(pain);
 723 }
 724
 725
 726 void GuiWorkArea::updateScreen()
 727 {
 728         GuiPainter pain(&screen_);
 729         buffer_view_->draw(pain);
 730 }
 731
 732
 733 void GuiWorkArea::showCursor(int x, int y, int h, CursorShape shape)
 734 {
 735         if (schedule_redraw_) {
 736                 buffer_view_->updateMetrics();
 737                 updateScreen();
 738                 viewport()->update(QRect(0, 0, viewport()->width(), viewport()->height()));
 739                 schedule_redraw_ = false;
 740                 // Show the cursor immediately after the update.
 741                 hideCursor();
 742                 toggleCursor();
 743                 return;
 744         }
 745
 746         cursor_->update(x, y, h, shape);
 747         cursor_->show();
 748         viewport()->update(cursor_->rect());
 749 }
 750
 751
 752 void GuiWorkArea::removeCursor()
 753 {
 754         cursor_->hide();
 755         //if (!qApp->focusWidget())
 756                 viewport()->update(cursor_->rect());
 757 }
 758
 759
 760 void GuiWorkArea::inputMethodEvent(QInputMethodEvent * e)
 761 {
 762         QString const & commit_string = e->commitString();
 763         docstring const & preedit_string
 764                 = qstring_to_ucs4(e->preeditString());
 765
 766         if (!commit_string.isEmpty()) {
 767
 768                 LYXERR(Debug::KEY, BOOST_CURRENT_FUNCTION
 769                         << " preeditString =" << fromqstr(e->preeditString())
 770                         << " commitString  =" << fromqstr(e->commitString()));
 771
 772                 int key = 0;
 773
 774                 // FIXME Iwami 04/01/07: we should take care also of UTF16 surrogates here.
 775                 for (int i = 0; i < commit_string.size(); ++i) {
 776                         QKeyEvent ev(QEvent::KeyPress, key, Qt::NoModifier, commit_string[i]);
 777                         keyPressEvent(&ev);
 778                 }
 779         }
 780
 781         // Hide the cursor during the kana-kanji transformation.
 782         if (preedit_string.empty())
 783                 startBlinkingCursor();
 784         else
 785                 stopBlinkingCursor();
 786
 787         // last_width : for checking if last preedit string was/wasn't empty.
 788         static bool last_width = false;
 789         if (!last_width && preedit_string.empty()) {
 790                 // if last_width is last length of preedit string.
 791                 e->accept();
 792                 return;
 793         }
 794
 795         GuiPainter pain(&screen_);
 796         buffer_view_->updateMetrics();
 797         buffer_view_->draw(pain);
 798         FontInfo font = buffer_view_->cursor().getFont().fontInfo();
 799         FontMetrics const & fm = theFontMetrics(font);
 800         int height = fm.maxHeight();
 801         int cur_x = cursor_->rect().left();
 802         int cur_y = cursor_->rect().bottom();
 803
 804         // redraw area of preedit string.
 805         update(0, cur_y - height, viewport()->width(),
 806                 (height + 1) * preedit_lines_);
 807
 808         if (preedit_string.empty()) {
 809                 last_width = false;
 810                 preedit_lines_ = 1;
 811                 e->accept();
 812                 return;
 813         }
 814         last_width = true;
 815
 816         // att : stores an IM attribute.
 817         QList<QInputMethodEvent::Attribute> const & att = e->attributes();
 818
 819         // get attributes of input method cursor.
 820         // cursor_pos : cursor position in preedit string.
 821         size_t cursor_pos = 0;
 822         bool cursor_is_visible = false;
 823         for (int i = 0; i < att.size(); ++i) {
 824                 if (att.at(i).type == QInputMethodEvent::Cursor) {
 825                         cursor_pos = att.at(i).start;
 826                         cursor_is_visible = att.at(i).length != 0;
 827                         break;
 828                 }
 829         }
 830
 831         size_t preedit_length = preedit_string.length();
 832
 833         // get position of selection in input method.
 834         // FIXME: isn't there a way to do this simplier?
 835         // rStart : cursor position in selected string in IM.
 836         size_t rStart = 0;
 837         // rLength : selected string length in IM.
 838         size_t rLength = 0;
 839         if (cursor_pos < preedit_length) {
 840                 for (int i = 0; i < att.size(); ++i) {
 841                         if (att.at(i).type == QInputMethodEvent::TextFormat) {
 842                                 if (att.at(i).start <= int(cursor_pos)
 843                                         && int(cursor_pos) < att.at(i).start + att.at(i).length) {
 844                                                 rStart = att.at(i).start;
 845                                                 rLength = att.at(i).length;
 846                                                 if (!cursor_is_visible)
 847                                                         cursor_pos += rLength;
 848                                                 break;
 849                                 }
 850                         }
 851                 }
 852         }
 853         else {
 854                 rStart = cursor_pos;
 855                 rLength = 0;
 856         }
 857
 858         int const right_margin = rightMargin();
 859         Painter::preedit_style ps;
 860         // Most often there would be only one line:
 861         preedit_lines_ = 1;
 862         for (size_t pos = 0; pos != preedit_length; ++pos) {
 863                 char_type const typed_char = preedit_string[pos];
 864                 // reset preedit string style
 865                 ps = Painter::preedit_default;
 866
 867                 // if we reached the right extremity of the screen, go to next line.
 868                 if (cur_x + fm.width(typed_char) > viewport()->width() - right_margin) {
 869                         cur_x = right_margin;
 870                         cur_y += height + 1;
 871                         ++preedit_lines_;
 872                 }
 873                 // preedit strings are displayed with dashed underline
 874                 // and partial strings are displayed white on black indicating
 875                 // that we are in selecting mode in the input method.
 876                 // FIXME: rLength == preedit_length is not a changing condition
 877                 // FIXME: should be put out of the loop.
 878                 if (pos >= rStart
 879                         && pos < rStart + rLength
 880                         && !(cursor_pos < rLength && rLength == preedit_length))
 881                         ps = Painter::preedit_selecting;
 882
 883                 if (pos == cursor_pos
 884                         && (cursor_pos < rLength && rLength == preedit_length))
 885                         ps = Painter::preedit_cursor;
 886
 887                 // draw one character and update cur_x.
 888                 cur_x += pain.preeditText(cur_x, cur_y, typed_char, font, ps);
 889         }
 890
 891         // update the preedit string screen area.
 892         update(0, cur_y - preedit_lines_*height, viewport()->width(),
 893                 (height + 1) * preedit_lines_);
 894
 895         // Don't forget to accept the event!
 896         e->accept();
 897 }
 898
 899
 900 QVariant GuiWorkArea::inputMethodQuery(Qt::InputMethodQuery query) const
 901 {
 902         QRect cur_r(0,0,0,0);
 903         switch (query) {
 904                 // this is the CJK-specific composition window position.
 905                 case Qt::ImMicroFocus:
 906                         cur_r = cursor_->rect();
 907                         if (preedit_lines_ != 1)
 908                                 cur_r.moveLeft(10);
 909                         cur_r.moveBottom(cur_r.bottom() + cur_r.height() * preedit_lines_);
 910                         // return lower right of cursor in LyX.
 911                         return cur_r;
 912                 default:
 913                         return QWidget::inputMethodQuery(query);
 914         }
 915 }
 916
 917
 918 void GuiWorkArea::updateWindowTitle()
 919 {
 920         docstring maximize_title;
 921         docstring minimize_title;
 922
 923         Buffer & buf = buffer_view_->buffer();
 924         FileName const fileName = buf.fileName();
 925         if (!fileName.empty()) {
 926                 maximize_title = fileName.displayName(30);
 927                 minimize_title = from_utf8(fileName.onlyFileName());
 928                 if (!buf.isClean()) {
 929                         maximize_title += _(" (changed)");
 930                         minimize_title += char_type('*');
 931                 }
 932                 if (buf.isReadonly())
 933                         maximize_title += _(" (read only)");
 934         }
 935
 936         QString title = windowTitle();
 937         QString new_title = toqstr(maximize_title);
 938         if (title == new_title)
 939                 return;
 940
 941         QWidget::setWindowTitle(new_title);
 942         QWidget::setWindowIconText(toqstr(minimize_title));
 943         titleChanged(this);
 944 }
 945
 946
 947 void GuiWorkArea::setReadOnly(bool)
 948 {
 949         updateWindowTitle();
 950         if (this == lyx_view_->currentWorkArea())
 951                 lyx_view_->updateBufferDependent(false);
 952 }
 953
 954
 955 ////////////////////////////////////////////////////////////////////
 956 //
 957 // TabWorkArea
 958 //
 959 ////////////////////////////////////////////////////////////////////
 960
 961 TabWorkArea::TabWorkArea(QWidget * parent) : QTabWidget(parent)
 962 {
 963         QPalette pal = palette();
 964         pal.setColor(QPalette::Active, QPalette::Button,
 965                 pal.color(QPalette::Active, QPalette::Window));
 966         pal.setColor(QPalette::Disabled, QPalette::Button,
 967                 pal.color(QPalette::Disabled, QPalette::Window));
 968         pal.setColor(QPalette::Inactive, QPalette::Button,
 969                 pal.color(QPalette::Inactive, QPalette::Window));
 970
 971         QToolButton * closeTabButton = new QToolButton(this);
 972     closeTabButton->setPalette(pal);
 973         closeTabButton->setIcon(QIcon(":/images/closetab.png"));
 974         closeTabButton->setText("Close");
 975         closeTabButton->setAutoRaise(true);
 976         closeTabButton->setCursor(Qt::ArrowCursor);
 977         closeTabButton->setToolTip(tr("Close tab"));
 978         closeTabButton->setEnabled(true);
 979
 980         QObject::connect(this, SIGNAL(currentChanged(int)),
 981                 this, SLOT(on_currentTabChanged(int)));
 982         QObject::connect(closeTabButton, SIGNAL(clicked()),
 983                 this, SLOT(closeCurrentTab()));
 984
 985         setCornerWidget(closeTabButton);
 986         setUsesScrollButtons(true);
 987 }
 988
 989
 990 void TabWorkArea::showBar(bool show)
 991 {
 992         tabBar()->setEnabled(show);
 993         tabBar()->setVisible(show);
 994 }
 995
 996
 997 GuiWorkArea * TabWorkArea::currentWorkArea()
 998 {
 999         if (count() == 0)
1000                 return 0;
1001
1002         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(currentWidget());
1003         BOOST_ASSERT(wa);
1004         return wa;
1005 }
1006
1007
1008 GuiWorkArea * TabWorkArea::workArea(Buffer & buffer)
1009 {
1010         for (int i = 0; i != count(); ++i) {
1011                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i));
1012                 BOOST_ASSERT(wa);
1013                 if (&wa->bufferView().buffer() == &buffer)
1014                         return wa;
1015         }
1016         return 0;
1017 }
1018
1019
1020 void TabWorkArea::closeAll()
1021 {
1022         while (count()) {
1023                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(0));
1024                 BOOST_ASSERT(wa);
1025                 removeTab(0);
1026                 delete wa;
1027         }
1028 }
1029
1030
1031 bool TabWorkArea::setCurrentWorkArea(GuiWorkArea * work_area)
1032 {
1033         BOOST_ASSERT(work_area);
1034         int index = indexOf(work_area);
1035         if (index == -1)
1036                 return false;
1037
1038         if (index == currentIndex())
1039                 // Make sure the work area is up to date.
1040                 on_currentTabChanged(index);
1041         else
1042                 // Switch to the work area.
1043                 setCurrentIndex(index);
1044         work_area->setFocus();
1045
1046         return true;
1047 }
1048
1049
1050 GuiWorkArea * TabWorkArea::addWorkArea(Buffer & buffer, GuiView & view)
1051 {
1052         GuiWorkArea * wa = new GuiWorkArea(buffer, view);
1053         wa->setUpdatesEnabled(false);
1054         // Hide tabbar if there's no tab (avoid a resize and a flashing tabbar
1055         // when hiding it again below).
1056         showBar(count() > 0);
1057         addTab(wa, wa->windowTitle());
1058         QObject::connect(wa, SIGNAL(titleChanged(GuiWorkArea *)),
1059                 this, SLOT(updateTabText(GuiWorkArea *)));
1060         // Hide tabbar if there's only one tab.
1061         showBar(count() > 1);
1062         return wa;
1063 }
1064
1065
1066 bool TabWorkArea::removeWorkArea(GuiWorkArea * work_area)
1067 {
1068         BOOST_ASSERT(work_area);
1069         int index = indexOf(work_area);
1070         if (index == -1)
1071                 return false;
1072
1073         work_area->setUpdatesEnabled(false);
1074         removeTab(index);
1075         delete work_area;
1076
1077         if (count()) {
1078                 // make sure the next work area is enabled.
1079                 currentWidget()->setUpdatesEnabled(true);
1080                 // Hide tabbar if there's only one tab.
1081                 showBar(count() > 1);
1082         }
1083         return true;
1084 }
1085
1086
1087 void TabWorkArea::on_currentTabChanged(int i)
1088 {
1089         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i));
1090         BOOST_ASSERT(wa);
1091         BufferView & bv = wa->bufferView();
1092         bv.cursor().fixIfBroken();
1093         bv.updateMetrics();
1094         wa->setUpdatesEnabled(true);
1095         wa->redraw();
1096         wa->setFocus();
1097         ///
1098         currentWorkAreaChanged(wa);
1099
1100         LYXERR(Debug::GUI, "currentTabChanged " << i
1101                 << "File" << bv.buffer().absFileName());
1102 }
1103
1104
1105 void TabWorkArea::closeCurrentTab()
1106 {
1107         lyx::dispatch(FuncRequest(LFUN_BUFFER_CLOSE));
1108 }
1109
1110
1111 void TabWorkArea::updateTabText(GuiWorkArea * wa)
1112 {
1113         int const i = indexOf(wa);
1114         if (i < 0)
1115                 return;
1116         setTabText(i, wa->windowTitle());
1117 }
1118
1119 } // namespace frontend
1120 } // namespace lyx
1121
1122 #include "GuiWorkArea_moc.cpp"