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