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 "debug.h"
  22 #include "Font.h"
  23 #include "FuncRequest.h"
  24 #include "gettext.h"
  25 #include "GuiApplication.h"
  26 #include "GuiKeySymbol.h"
  27 #include "GuiPainter.h"
  28 #include "GuiView.h"
  29 #include "KeySymbol.h"
  30 #include "Language.h"
  31 #include "LyXFunc.h"
  32 #include "LyXRC.h"
  33 #include "MetricsInfo.h"
  34 #include "qt_helpers.h"
  35 #include "version.h"
  36
  37 #include "graphics/GraphicsImage.h"
  38 #include "graphics/GraphicsLoader.h"
  39
  40 #include "support/FileName.h"
  41 #include "support/ForkedcallsController.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 using support::ForkedcallsController;
  83
  84
  85 /// return the LyX mouse button state from Qt's
  86 static mouse_button::state q_button_state(Qt::MouseButton button)
  87 {
  88         mouse_button::state b = mouse_button::none;
  89         switch (button) {
  90                 case Qt::LeftButton:
  91                         b = mouse_button::button1;
  92                         break;
  93                 case Qt::MidButton:
  94                         b = mouse_button::button2;
  95                         break;
  96                 case Qt::RightButton:
  97                         b = mouse_button::button3;
  98                         break;
  99                 default:
 100                         break;
 101         }
 102         return b;
 103 }
 104
 105
 106 /// return the LyX mouse button state from Qt's
 107 mouse_button::state q_motion_state(Qt::MouseButtons state)
 108 {
 109         mouse_button::state b = mouse_button::none;
 110         if (state & Qt::LeftButton)
 111                 b |= mouse_button::button1;
 112         if (state & Qt::MidButton)
 113                 b |= mouse_button::button2;
 114         if (state & Qt::RightButton)
 115                 b |= mouse_button::button3;
 116         return b;
 117 }
 118
 119
 120 namespace frontend {
 121
 122 class CursorWidget {
 123 public:
 124         CursorWidget() {}
 125
 126         void draw(QPainter & painter)
 127         {
 128                 if (show_ && rect_.isValid()) {
 129                         switch (shape_) {
 130                         case L_SHAPE:
 131                                 painter.fillRect(rect_.x(), rect_.y(), CursorWidth, rect_.height(), color_);
 132                                 painter.setPen(color_);
 133                                 painter.drawLine(rect_.bottomLeft().x() + CursorWidth, rect_.bottomLeft().y(),
 134                                                                                                  rect_.bottomRight().x(), rect_.bottomLeft().y());
 135                                 break;
 136
 137                         case REVERSED_L_SHAPE:
 138                                 painter.fillRect(rect_.x() + rect_.height() / 3, rect_.y(), CursorWidth, rect_.height(), color_);
 139                                 painter.setPen(color_);
 140                                 painter.drawLine(rect_.bottomRight().x() - CursorWidth, rect_.bottomLeft().y(),
 141                                                                                                          rect_.bottomLeft().x(), rect_.bottomLeft().y());
 142                                 break;
 143
 144                         default:
 145                                 painter.fillRect(rect_, color_);
 146                                 break;
 147                         }
 148                 }
 149         }
 150
 151         void update(int x, int y, int h, CursorShape shape)
 152         {
 153                 color_ = guiApp->colorCache().get(Color_cursor);
 154                 shape_ = shape;
 155                 switch (shape) {
 156                 case L_SHAPE:
 157                         rect_ = QRect(x, y, CursorWidth + h / 3, h);
 158                         break;
 159                 case REVERSED_L_SHAPE:
 160                         rect_ = QRect(x - h / 3, y, CursorWidth + h / 3, h);
 161                         break;
 162                 default:
 163                         rect_ = QRect(x, y, CursorWidth, h);
 164                         break;
 165                 }
 166         }
 167
 168         void show(bool set_show = true) { show_ = set_show; }
 169         void hide() { show_ = false; }
 170
 171         QRect const & rect() { return rect_; }
 172
 173 private:
 174         ///
 175         CursorShape shape_;
 176         ///
 177         bool show_;
 178         ///
 179         QColor color_;
 180         ///
 181         QRect rect_;
 182 };
 183
 184
 185 // This is a 'heartbeat' generating synthetic mouse move events when the
 186 // cursor is at the top or bottom edge of the viewport. One scroll per 0.2 s
 187 SyntheticMouseEvent::SyntheticMouseEvent()
 188         : timeout(200), restart_timeout(true),
 189           x_old(-1), y_old(-1), scrollbar_value_old(-1.0)
 190 {}
 191
 192
 193
 194 // All the below connection objects are needed because of a bug in some
 195 // versions of GCC (<=2.96 are on the suspects list.) By having and assigning
 196 // to these connections we avoid a segfault upon startup, and also at exit.
 197 // (Lgb)
 198
 199 static boost::signals::connection timecon;
 200
 201
 202 GuiWorkArea::GuiWorkArea(Buffer & buffer, GuiView & lv)
 203         : buffer_view_(new BufferView(buffer)), lyx_view_(&lv),
 204           cursor_visible_(false), cursor_timeout_(400),
 205     need_resize_(false), schedule_redraw_(false),
 206                 preedit_lines_(1)
 207 {
 208         buffer.workAreaManager().add(this);
 209         // Setup the signals
 210         timecon = cursor_timeout_.timeout
 211                 .connect(boost::bind(&GuiWorkArea::toggleCursor, this));
 212
 213         cursor_timeout_.start();
 214
 215         screen_ = QPixmap(viewport()->width(), viewport()->height());
 216         cursor_ = new frontend::CursorWidget();
 217         cursor_->hide();
 218
 219         setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
 220         setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 221         setAcceptDrops(true);
 222         setMouseTracking(true);
 223         setMinimumSize(100, 70);
 224         updateWindowTitle();
 225
 226         viewport()->setAutoFillBackground(false);
 227         // We don't need double-buffering nor SystemBackground on
 228         // the viewport because we have our own backing pixmap.
 229         viewport()->setAttribute(Qt::WA_NoSystemBackground);
 230
 231         setFocusPolicy(Qt::WheelFocus);
 232
 233         viewport()->setCursor(Qt::IBeamCursor);
 234
 235         synthetic_mouse_event_.timeout.timeout.connect(
 236                 boost::bind(&GuiWorkArea::generateSyntheticMouseEvent,
 237                                         this));
 238
 239         // Initialize the vertical Scroll Bar
 240         QObject::connect(verticalScrollBar(), SIGNAL(actionTriggered(int)),
 241                 this, SLOT(adjustViewWithScrollBar(int)));
 242
 243         // disable context menu for the scrollbar
 244         verticalScrollBar()->setContextMenuPolicy(Qt::NoContextMenu);
 245
 246         // PageStep only depends on the viewport height.
 247         verticalScrollBar()->setPageStep(viewport()->height());
 248
 249         LYXERR(Debug::GUI, BOOST_CURRENT_FUNCTION
 250                 << "\n viewport width\t" << viewport()->width()
 251                 << "\n viewport height\t" << viewport()->height());
 252
 253         // Enables input methods for asian languages.
 254         // Must be set when creating custom text editing widgets.
 255         setAttribute(Qt::WA_InputMethodEnabled, true);
 256 }
 257
 258
 259
 260 GuiWorkArea::~GuiWorkArea()
 261 {
 262         buffer_view_->buffer().workAreaManager().remove(this);
 263         delete buffer_view_;
 264 }
 265
 266
 267 void GuiWorkArea::close()
 268 {
 269         lyx_view_->removeWorkArea(this);
 270 }
 271
 272
 273 BufferView & GuiWorkArea::bufferView()
 274 {
 275         return *buffer_view_;
 276 }
 277
 278
 279 BufferView const & GuiWorkArea::bufferView() const
 280 {
 281         return *buffer_view_;
 282 }
 283
 284
 285 void GuiWorkArea::stopBlinkingCursor()
 286 {
 287         cursor_timeout_.stop();
 288         hideCursor();
 289 }
 290
 291
 292 void GuiWorkArea::startBlinkingCursor()
 293 {
 294         showCursor();
 295         cursor_timeout_.restart();
 296 }
 297
 298
 299 void GuiWorkArea::redraw()
 300 {
 301         if (!isVisible())
 302                 // No need to redraw in this case.
 303                 return;
 304
 305         // No need to do anything if this is the current view. The BufferView
 306         // metrics are already up to date.
 307         if (lyx_view_ != guiApp->currentView()) {
 308                 // FIXME: it would be nice to optimize for the off-screen case.
 309                 buffer_view_->updateMetrics();
 310                 buffer_view_->cursor().fixIfBroken();
 311         }
 312
 313         updateScrollbar();
 314
 315         // update cursor position, because otherwise it has to wait until
 316         // the blinking interval is over
 317         if (cursor_visible_) {
 318                 hideCursor();
 319                 showCursor();
 320         }
 321
 322         LYXERR(Debug::WORKAREA, "WorkArea::redraw screen");
 323         updateScreen();
 324         update(0, 0, viewport()->width(), viewport()->height());
 325
 326         if (lyxerr.debugging(Debug::WORKAREA))
 327                 buffer_view_->coordCache().dump();
 328 }
 329
 330
 331 void GuiWorkArea::processKeySym(KeySymbol const & key, KeyModifier mod)
 332 {
 333         // In order to avoid bad surprise in the middle of an operation,
 334         // we better stop the blinking cursor.
 335         stopBlinkingCursor();
 336
 337         theLyXFunc().setLyXView(lyx_view_);
 338         theLyXFunc().processKeySym(key, mod);
 339 }
 340
 341
 342 void GuiWorkArea::dispatch(FuncRequest const & cmd0, KeyModifier mod)
 343 {
 344         // Handle drag&drop
 345         if (cmd0.action == LFUN_FILE_OPEN) {
 346                 lyx_view_->dispatch(cmd0);
 347                 return;
 348         }
 349
 350         theLyXFunc().setLyXView(lyx_view_);
 351
 352         FuncRequest cmd;
 353
 354         if (cmd0.action == LFUN_MOUSE_PRESS) {
 355                 if (mod == ShiftModifier)
 356                         cmd = FuncRequest(cmd0, "region-select");
 357                 else if (mod == ControlModifier)
 358                         cmd = FuncRequest(cmd0, "paragraph-select");
 359                 else
 360                         cmd = cmd0;
 361         }
 362         else
 363                 cmd = cmd0;
 364
 365         // In order to avoid bad surprise in the middle of an operation, we better stop
 366         // the blinking cursor.
 367         if (!(cmd.action == LFUN_MOUSE_MOTION
 368                 && cmd.button() == mouse_button::none))
 369                 stopBlinkingCursor();
 370
 371         buffer_view_->mouseEventDispatch(cmd);
 372
 373         // Skip these when selecting
 374         if (cmd.action != LFUN_MOUSE_MOTION) {
 375                 lyx_view_->updateLayoutChoice(false);
 376                 lyx_view_->updateToolbars();
 377         }
 378
 379         // GUI tweaks except with mouse motion with no button pressed.
 380         if (!(cmd.action == LFUN_MOUSE_MOTION
 381                 && cmd.button() == mouse_button::none)) {
 382                 // Slight hack: this is only called currently when we
 383                 // clicked somewhere, so we force through the display
 384                 // of the new status here.
 385                 lyx_view_->clearMessage();
 386
 387                 // Show the cursor immediately after any operation.
 388                 startBlinkingCursor();
 389         }
 390 }
 391
 392
 393 void GuiWorkArea::resizeBufferView()
 394 {
 395         // WARNING: Please don't put any code that will trigger a repaint here!
 396         // We are already inside a paint event.
 397         lyx_view_->setBusy(true);
 398         buffer_view_->resize(viewport()->width(), viewport()->height());
 399         lyx_view_->updateLayoutChoice(false);
 400         lyx_view_->setBusy(false);
 401         need_resize_ = false;
 402 }
 403
 404
 405 void GuiWorkArea::showCursor()
 406 {
 407         if (cursor_visible_)
 408                 return;
 409
 410         CursorShape shape = BAR_SHAPE;
 411
 412         Font const & realfont = buffer_view_->cursor().real_current_font;
 413         BufferParams const & bp = buffer_view_->buffer().params();
 414         bool const samelang = realfont.language() == bp.language;
 415         bool const isrtl = realfont.isVisibleRightToLeft();
 416
 417         if (!samelang || isrtl != bp.language->rightToLeft()) {
 418                 shape = L_SHAPE;
 419                 if (isrtl)
 420                         shape = REVERSED_L_SHAPE;
 421         }
 422
 423         // The ERT language hack needs fixing up
 424         if (realfont.language() == latex_language)
 425                 shape = BAR_SHAPE;
 426
 427         Font const font = buffer_view_->cursor().getFont();
 428         FontMetrics const & fm = theFontMetrics(font);
 429         int const asc = fm.maxAscent();
 430         int const des = fm.maxDescent();
 431         int h = asc + des;
 432         int x = 0;
 433         int y = 0;
 434         buffer_view_->cursor().getPos(x, y);
 435         y -= asc;
 436
 437         // if it doesn't touch the screen, don't try to show it
 438         if (y + h < 0 || y >= viewport()->height())
 439                 return;
 440
 441         cursor_visible_ = true;
 442         showCursor(x, y, h, shape);
 443 }
 444
 445
 446 void GuiWorkArea::hideCursor()
 447 {
 448         if (!cursor_visible_)
 449                 return;
 450
 451         cursor_visible_ = false;
 452         removeCursor();
 453 }
 454
 455
 456 void GuiWorkArea::toggleCursor()
 457 {
 458         if (cursor_visible_)
 459                 hideCursor();
 460         else
 461                 showCursor();
 462
 463         // Use this opportunity to deal with any child processes that
 464         // have finished but are waiting to communicate this fact
 465         // to the rest of LyX.
 466         ForkedcallsController & fcc = ForkedcallsController::get();
 467         fcc.handleCompletedProcesses();
 468
 469         cursor_timeout_.restart();
 470 }
 471
 472
 473 void GuiWorkArea::updateScrollbar()
 474 {
 475         verticalScrollBar()->setTracking(false);
 476
 477         buffer_view_->updateScrollbar();
 478         ScrollbarParameters const & scroll_ = buffer_view_->scrollbarParameters();
 479
 480         // do what cursor movement does (some grey)
 481         int const h = scroll_.height + viewport()->height() / 4;
 482         int scroll_max_ = std::max(0, h - viewport()->height());
 483
 484         verticalScrollBar()->setRange(0, scroll_max_);
 485         verticalScrollBar()->setSliderPosition(scroll_.position);
 486         verticalScrollBar()->setSingleStep(scroll_.lineScrollHeight);
 487         verticalScrollBar()->setValue(scroll_.position);
 488
 489         verticalScrollBar()->setTracking(true);
 490 }
 491
 492
 493 void GuiWorkArea::adjustViewWithScrollBar(int action)
 494 {
 495         stopBlinkingCursor();
 496         if (action == QAbstractSlider::SliderPageStepAdd)
 497                 buffer_view_->scrollDown(viewport()->height());
 498         else if (action == QAbstractSlider::SliderPageStepSub)
 499                 buffer_view_->scrollUp(viewport()->height());
 500         else
 501                 buffer_view_->scrollDocView(verticalScrollBar()->sliderPosition());
 502
 503         if (lyxrc.cursor_follows_scrollbar) {
 504                 buffer_view_->setCursorFromScrollbar();
 505                 lyx_view_->updateLayoutChoice(false);
 506         }
 507         // Show the cursor immediately after any operation.
 508         startBlinkingCursor();
 509         QApplication::syncX();
 510 }
 511
 512
 513 void GuiWorkArea::focusInEvent(QFocusEvent * /*event*/)
 514 {
 515         // Repaint the whole screen.
 516         // Note: this is different from redraw() as only the backing pixmap
 517         // will be redrawn, which is cheap.
 518         viewport()->repaint();
 519
 520         startBlinkingCursor();
 521 }
 522
 523
 524 void GuiWorkArea::focusOutEvent(QFocusEvent * /*event*/)
 525 {
 526         stopBlinkingCursor();
 527 }
 528
 529
 530 void GuiWorkArea::mousePressEvent(QMouseEvent * e)
 531 {
 532         if (dc_event_.active && dc_event_ == *e) {
 533                 dc_event_.active = false;
 534                 FuncRequest cmd(LFUN_MOUSE_TRIPLE, e->x(), e->y(),
 535                         q_button_state(e->button()));
 536                 dispatch(cmd);
 537                 return;
 538         }
 539
 540         inputContext()->reset();
 541
 542         FuncRequest const cmd(LFUN_MOUSE_PRESS, e->x(), e->y(),
 543                 q_button_state(e->button()));
 544         dispatch(cmd, q_key_state(e->modifiers()));
 545 }
 546
 547
 548 void GuiWorkArea::mouseReleaseEvent(QMouseEvent * e)
 549 {
 550         if (synthetic_mouse_event_.timeout.running())
 551                 synthetic_mouse_event_.timeout.stop();
 552
 553         FuncRequest const cmd(LFUN_MOUSE_RELEASE, e->x(), e->y(),
 554                               q_button_state(e->button()));
 555         dispatch(cmd);
 556 }
 557
 558
 559 void GuiWorkArea::mouseMoveEvent(QMouseEvent * e)
 560 {
 561         // we kill the triple click if we move
 562         doubleClickTimeout();
 563         FuncRequest cmd(LFUN_MOUSE_MOTION, e->x(), e->y(),
 564                               q_motion_state(e->buttons()));
 565
 566         // If we're above or below the work area...
 567         if (e->y() <= 20 || e->y() >= viewport()->height() - 20) {
 568                 // Make sure only a synthetic event can cause a page scroll,
 569                 // so they come at a steady rate:
 570                 if (e->y() <= 20)
 571                         // _Force_ a scroll up:
 572                         cmd.y = -40;
 573                 else
 574                         cmd.y = viewport()->height();
 575                 // Store the event, to be handled when the timeout expires.
 576                 synthetic_mouse_event_.cmd = cmd;
 577
 578                 if (synthetic_mouse_event_.timeout.running())
 579                         // Discard the event. Note that it _may_ be handled
 580                         // when the timeout expires if
 581                         // synthetic_mouse_event_.cmd has not been overwritten.
 582                         // Ie, when the timeout expires, we handle the
 583                         // most recent event but discard all others that
 584                         // occurred after the one used to start the timeout
 585                         // in the first place.
 586                         return;
 587                 else {
 588                         synthetic_mouse_event_.restart_timeout = true;
 589                         synthetic_mouse_event_.timeout.start();
 590                         // Fall through to handle this event...
 591                 }
 592
 593         } else if (synthetic_mouse_event_.timeout.running()) {
 594                 // Store the event, to be possibly handled when the timeout
 595                 // expires.
 596                 // Once the timeout has expired, normal control is returned
 597                 // to mouseMoveEvent (restart_timeout = false).
 598                 // This results in a much smoother 'feel' when moving the
 599                 // mouse back into the work area.
 600                 synthetic_mouse_event_.cmd = cmd;
 601                 synthetic_mouse_event_.restart_timeout = false;
 602                 return;
 603         }
 604
 605         // Has anything changed on-screen since the last QMouseEvent
 606         // was received?
 607         double const scrollbar_value = verticalScrollBar()->value();
 608         if (e->x() != synthetic_mouse_event_.x_old ||
 609             e->y() != synthetic_mouse_event_.y_old ||
 610             scrollbar_value != synthetic_mouse_event_.scrollbar_value_old) {
 611                 // Yes it has. Store the params used to check this.
 612                 synthetic_mouse_event_.x_old = e->x();
 613                 synthetic_mouse_event_.y_old = e->y();
 614                 synthetic_mouse_event_.scrollbar_value_old = scrollbar_value;
 615
 616                 // ... and dispatch the event to the LyX core.
 617                 dispatch(cmd);
 618         }
 619 }
 620
 621
 622 void GuiWorkArea::wheelEvent(QWheelEvent * e)
 623 {
 624         // Wheel rotation by one notch results in a delta() of 120 (see
 625         // documentation of QWheelEvent)
 626         int const lines = qApp->wheelScrollLines() * e->delta() / 120;
 627         verticalScrollBar()->setValue(verticalScrollBar()->value() -
 628                         lines *  verticalScrollBar()->singleStep());
 629         adjustViewWithScrollBar();
 630 }
 631
 632
 633 void GuiWorkArea::generateSyntheticMouseEvent()
 634 {
 635 // Set things off to generate the _next_ 'pseudo' event.
 636         if (synthetic_mouse_event_.restart_timeout)
 637                 synthetic_mouse_event_.timeout.start();
 638
 639         // Has anything changed on-screen since the last timeout signal
 640         // was received?
 641         double const scrollbar_value = verticalScrollBar()->value();
 642         if (scrollbar_value != synthetic_mouse_event_.scrollbar_value_old) {
 643                 // Yes it has. Store the params used to check this.
 644                 synthetic_mouse_event_.scrollbar_value_old = scrollbar_value;
 645
 646                 // ... and dispatch the event to the LyX core.
 647                 dispatch(synthetic_mouse_event_.cmd);
 648         }
 649 }
 650
 651
 652 void GuiWorkArea::keyPressEvent(QKeyEvent * ev)
 653 {
 654         // do nothing if there are other events
 655         // (the auto repeated events come too fast)
 656         // \todo FIXME: remove hard coded Qt keys, process the key binding
 657 #ifdef Q_WS_X11
 658         if (XEventsQueued(QX11Info::display(), 0) > 1 && ev->isAutoRepeat()
 659                         && (Qt::Key_PageDown || Qt::Key_PageUp)) {
 660                 LYXERR(Debug::KEY, BOOST_CURRENT_FUNCTION
 661                         << "\nsystem is busy: scroll key event ignored");
 662                 ev->ignore();
 663                 return;
 664         }
 665 #endif
 666
 667         LYXERR(Debug::KEY, BOOST_CURRENT_FUNCTION
 668                 << " count=" << ev->count()
 669                 << " text=" << fromqstr(ev->text())
 670                 << " isAutoRepeat=" << ev->isAutoRepeat()
 671                 << " key=" << ev->key());
 672
 673         KeySymbol sym;
 674         setKeySymbol(&sym, ev);
 675         processKeySym(sym, q_key_state(ev->modifiers()));
 676 }
 677
 678
 679 void GuiWorkArea::doubleClickTimeout()
 680 {
 681         dc_event_.active = false;
 682 }
 683
 684
 685 void GuiWorkArea::mouseDoubleClickEvent(QMouseEvent * ev)
 686 {
 687         dc_event_ = DoubleClick(ev);
 688         QTimer::singleShot(QApplication::doubleClickInterval(), this,
 689                            SLOT(doubleClickTimeout()));
 690         FuncRequest cmd(LFUN_MOUSE_DOUBLE,
 691                         ev->x(), ev->y(),
 692                         q_button_state(ev->button()));
 693         dispatch(cmd);
 694 }
 695
 696
 697 void GuiWorkArea::resizeEvent(QResizeEvent * ev)
 698 {
 699         QAbstractScrollArea::resizeEvent(ev);
 700         need_resize_ = true;
 701 }
 702
 703
 704 void GuiWorkArea::update(int x, int y, int w, int h)
 705 {
 706         viewport()->repaint(x, y, w, h);
 707 }
 708
 709
 710 void GuiWorkArea::paintEvent(QPaintEvent * ev)
 711 {
 712         QRect const rc = ev->rect();
 713         /*
 714         LYXERR(Debug::PAINTING) << "paintEvent begin: x: " << rc.x()
 715                 << " y: " << rc.y()
 716                 << " w: " << rc.width()
 717                 << " h: " << rc.height() << endl;
 718         */
 719
 720         if (need_resize_) {
 721                 verticalScrollBar()->setPageStep(viewport()->height());
 722                 screen_ = QPixmap(viewport()->width(), viewport()->height());
 723                 resizeBufferView();
 724                 updateScreen();
 725                 hideCursor();
 726                 showCursor();
 727         }
 728
 729         QPainter pain(viewport());
 730         pain.drawPixmap(rc, screen_, rc);
 731         cursor_->draw(pain);
 732 }
 733
 734
 735 void GuiWorkArea::updateScreen()
 736 {
 737         GuiPainter pain(&screen_);
 738         buffer_view_->draw(pain);
 739 }
 740
 741
 742 void GuiWorkArea::showCursor(int x, int y, int h, CursorShape shape)
 743 {
 744         if (schedule_redraw_) {
 745                 buffer_view_->updateMetrics();
 746                 updateScreen();
 747                 viewport()->update(QRect(0, 0, viewport()->width(), viewport()->height()));
 748                 schedule_redraw_ = false;
 749                 // Show the cursor immediately after the update.
 750                 hideCursor();
 751                 toggleCursor();
 752                 return;
 753         }
 754
 755         cursor_->update(x, y, h, shape);
 756         cursor_->show();
 757         viewport()->update(cursor_->rect());
 758 }
 759
 760
 761 void GuiWorkArea::removeCursor()
 762 {
 763         cursor_->hide();
 764         //if (!qApp->focusWidget())
 765                 viewport()->update(cursor_->rect());
 766 }
 767
 768
 769 void GuiWorkArea::inputMethodEvent(QInputMethodEvent * e)
 770 {
 771         QString const & commit_string = e->commitString();
 772         docstring const & preedit_string
 773                 = qstring_to_ucs4(e->preeditString());
 774
 775         if (!commit_string.isEmpty()) {
 776
 777                 LYXERR(Debug::KEY, BOOST_CURRENT_FUNCTION
 778                         << " preeditString =" << fromqstr(e->preeditString())
 779                         << " commitString  =" << fromqstr(e->commitString()));
 780
 781                 int key = 0;
 782
 783                 // FIXME Iwami 04/01/07: we should take care also of UTF16 surrogates here.
 784                 for (int i = 0; i < commit_string.size(); ++i) {
 785                         QKeyEvent ev(QEvent::KeyPress, key, Qt::NoModifier, commit_string[i]);
 786                         keyPressEvent(&ev);
 787                 }
 788         }
 789
 790         // Hide the cursor during the kana-kanji transformation.
 791         if (preedit_string.empty())
 792                 startBlinkingCursor();
 793         else
 794                 stopBlinkingCursor();
 795
 796         // last_width : for checking if last preedit string was/wasn't empty.
 797         static bool last_width = false;
 798         if (!last_width && preedit_string.empty()) {
 799                 // if last_width is last length of preedit string.
 800                 e->accept();
 801                 return;
 802         }
 803
 804         GuiPainter pain(&screen_);
 805         buffer_view_->updateMetrics();
 806         buffer_view_->draw(pain);
 807         FontInfo font = buffer_view_->cursor().getFont().fontInfo();
 808         FontMetrics const & fm = theFontMetrics(font);
 809         int height = fm.maxHeight();
 810         int cur_x = cursor_->rect().left();
 811         int cur_y = cursor_->rect().bottom();
 812
 813         // redraw area of preedit string.
 814         update(0, cur_y - height, viewport()->width(),
 815                 (height + 1) * preedit_lines_);
 816
 817         if (preedit_string.empty()) {
 818                 last_width = false;
 819                 preedit_lines_ = 1;
 820                 e->accept();
 821                 return;
 822         }
 823         last_width = true;
 824
 825         // att : stores an IM attribute.
 826         QList<QInputMethodEvent::Attribute> const & att = e->attributes();
 827
 828         // get attributes of input method cursor.
 829         // cursor_pos : cursor position in preedit string.
 830         size_t cursor_pos = 0;
 831         bool cursor_is_visible = false;
 832         for (int i = 0; i < att.size(); ++i) {
 833                 if (att.at(i).type == QInputMethodEvent::Cursor) {
 834                         cursor_pos = att.at(i).start;
 835                         cursor_is_visible = att.at(i).length != 0;
 836                         break;
 837                 }
 838         }
 839
 840         size_t preedit_length = preedit_string.length();
 841
 842         // get position of selection in input method.
 843         // FIXME: isn't there a way to do this simplier?
 844         // rStart : cursor position in selected string in IM.
 845         size_t rStart = 0;
 846         // rLength : selected string length in IM.
 847         size_t rLength = 0;
 848         if (cursor_pos < preedit_length) {
 849                 for (int i = 0; i < att.size(); ++i) {
 850                         if (att.at(i).type == QInputMethodEvent::TextFormat) {
 851                                 if (att.at(i).start <= int(cursor_pos)
 852                                         && int(cursor_pos) < att.at(i).start + att.at(i).length) {
 853                                                 rStart = att.at(i).start;
 854                                                 rLength = att.at(i).length;
 855                                                 if (!cursor_is_visible)
 856                                                         cursor_pos += rLength;
 857                                                 break;
 858                                 }
 859                         }
 860                 }
 861         }
 862         else {
 863                 rStart = cursor_pos;
 864                 rLength = 0;
 865         }
 866
 867         int const right_margin = rightMargin();
 868         Painter::preedit_style ps;
 869         // Most often there would be only one line:
 870         preedit_lines_ = 1;
 871         for (size_t pos = 0; pos != preedit_length; ++pos) {
 872                 char_type const typed_char = preedit_string[pos];
 873                 // reset preedit string style
 874                 ps = Painter::preedit_default;
 875
 876                 // if we reached the right extremity of the screen, go to next line.
 877                 if (cur_x + fm.width(typed_char) > viewport()->width() - right_margin) {
 878                         cur_x = right_margin;
 879                         cur_y += height + 1;
 880                         ++preedit_lines_;
 881                 }
 882                 // preedit strings are displayed with dashed underline
 883                 // and partial strings are displayed white on black indicating
 884                 // that we are in selecting mode in the input method.
 885                 // FIXME: rLength == preedit_length is not a changing condition
 886                 // FIXME: should be put out of the loop.
 887                 if (pos >= rStart
 888                         && pos < rStart + rLength
 889                         && !(cursor_pos < rLength && rLength == preedit_length))
 890                         ps = Painter::preedit_selecting;
 891
 892                 if (pos == cursor_pos
 893                         && (cursor_pos < rLength && rLength == preedit_length))
 894                         ps = Painter::preedit_cursor;
 895
 896                 // draw one character and update cur_x.
 897                 cur_x += pain.preeditText(cur_x, cur_y, typed_char, font, ps);
 898         }
 899
 900         // update the preedit string screen area.
 901         update(0, cur_y - preedit_lines_*height, viewport()->width(),
 902                 (height + 1) * preedit_lines_);
 903
 904         // Don't forget to accept the event!
 905         e->accept();
 906 }
 907
 908
 909 QVariant GuiWorkArea::inputMethodQuery(Qt::InputMethodQuery query) const
 910 {
 911         QRect cur_r(0,0,0,0);
 912         switch (query) {
 913                 // this is the CJK-specific composition window position.
 914                 case Qt::ImMicroFocus:
 915                         cur_r = cursor_->rect();
 916                         if (preedit_lines_ != 1)
 917                                 cur_r.moveLeft(10);
 918                         cur_r.moveBottom(cur_r.bottom() + cur_r.height() * preedit_lines_);
 919                         // return lower right of cursor in LyX.
 920                         return cur_r;
 921                 default:
 922                         return QWidget::inputMethodQuery(query);
 923         }
 924 }
 925
 926
 927 void GuiWorkArea::updateWindowTitle()
 928 {
 929         docstring maximize_title;
 930         docstring minimize_title;
 931
 932         Buffer & buf = buffer_view_->buffer();
 933         FileName const fileName = buf.fileName();
 934         if (!fileName.empty()) {
 935                 maximize_title = fileName.displayName(30);
 936                 minimize_title = from_utf8(fileName.onlyFileName());
 937                 if (!buf.isClean()) {
 938                         maximize_title += _(" (changed)");
 939                         minimize_title += char_type('*');
 940                 }
 941                 if (buf.isReadonly())
 942                         maximize_title += _(" (read only)");
 943         }
 944
 945         QString title = windowTitle();
 946         QString new_title = toqstr(maximize_title);
 947         if (title == new_title)
 948                 return;
 949
 950         QWidget::setWindowTitle(new_title);
 951         QWidget::setWindowIconText(toqstr(minimize_title));
 952         titleChanged(this);
 953 }
 954
 955
 956 void GuiWorkArea::setReadOnly(bool)
 957 {
 958         updateWindowTitle();
 959         if (this == lyx_view_->currentWorkArea())
 960                 lyx_view_->updateBufferDependent(false);
 961 }
 962
 963
 964 ////////////////////////////////////////////////////////////////////
 965 //
 966 // TabWorkArea
 967 //
 968 ////////////////////////////////////////////////////////////////////
 969
 970 TabWorkArea::TabWorkArea(QWidget * parent) : QTabWidget(parent)
 971 {
 972         QPalette pal = palette();
 973         pal.setColor(QPalette::Active, QPalette::Button,
 974                 pal.color(QPalette::Active, QPalette::Window));
 975         pal.setColor(QPalette::Disabled, QPalette::Button,
 976                 pal.color(QPalette::Disabled, QPalette::Window));
 977         pal.setColor(QPalette::Inactive, QPalette::Button,
 978                 pal.color(QPalette::Inactive, QPalette::Window));
 979
 980         QToolButton * closeTabButton = new QToolButton(this);
 981     closeTabButton->setPalette(pal);
 982         closeTabButton->setIcon(QIcon(":/images/closetab.png"));
 983         closeTabButton->setText("Close");
 984         closeTabButton->setAutoRaise(true);
 985         closeTabButton->setCursor(Qt::ArrowCursor);
 986         closeTabButton->setToolTip(tr("Close tab"));
 987         closeTabButton->setEnabled(true);
 988
 989         QObject::connect(this, SIGNAL(currentChanged(int)),
 990                 this, SLOT(on_currentTabChanged(int)));
 991         QObject::connect(closeTabButton, SIGNAL(clicked()),
 992                 this, SLOT(closeCurrentTab()));
 993
 994         setCornerWidget(closeTabButton);
 995         setUsesScrollButtons(true);
 996 }
 997
 998
 999 void TabWorkArea::showBar(bool show)
1000 {
1001         tabBar()->setEnabled(show);
1002         tabBar()->setVisible(show);
1003 }
1004
1005
1006 GuiWorkArea * TabWorkArea::currentWorkArea()
1007 {
1008         if (count() == 0)
1009                 return 0;
1010
1011         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(currentWidget());
1012         BOOST_ASSERT(wa);
1013         return wa;
1014 }
1015
1016
1017 GuiWorkArea * TabWorkArea::workArea(Buffer & buffer)
1018 {
1019         for (int i = 0; i != count(); ++i) {
1020                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i));
1021                 BOOST_ASSERT(wa);
1022                 if (&wa->bufferView().buffer() == &buffer)
1023                         return wa;
1024         }
1025         return 0;
1026 }
1027
1028
1029 void TabWorkArea::closeAll()
1030 {
1031         while (count()) {
1032                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(0));
1033                 BOOST_ASSERT(wa);
1034                 removeTab(0);
1035                 delete wa;
1036         }
1037 }
1038
1039
1040 bool TabWorkArea::setCurrentWorkArea(GuiWorkArea * work_area)
1041 {
1042         BOOST_ASSERT(work_area);
1043         int index = indexOf(work_area);
1044         if (index == -1)
1045                 return false;
1046
1047         if (index == currentIndex())
1048                 // Make sure the work area is up to date.
1049                 on_currentTabChanged(index);
1050         else
1051                 // Switch to the work area.
1052                 setCurrentIndex(index);
1053         work_area->setFocus();
1054
1055         return true;
1056 }
1057
1058
1059 GuiWorkArea * TabWorkArea::addWorkArea(Buffer & buffer, GuiView & view)
1060 {
1061         GuiWorkArea * wa = new GuiWorkArea(buffer, view);
1062         wa->setUpdatesEnabled(false);
1063         // Hide tabbar if there's no tab (avoid a resize and a flashing tabbar
1064         // when hiding it again below).
1065         showBar(count() > 0);
1066         addTab(wa, wa->windowTitle());
1067         QObject::connect(wa, SIGNAL(titleChanged(GuiWorkArea *)),
1068                 this, SLOT(updateTabText(GuiWorkArea *)));
1069         // Hide tabbar if there's only one tab.
1070         showBar(count() > 1);
1071         return wa;
1072 }
1073
1074
1075 bool TabWorkArea::removeWorkArea(GuiWorkArea * work_area)
1076 {
1077         BOOST_ASSERT(work_area);
1078         int index = indexOf(work_area);
1079         if (index == -1)
1080                 return false;
1081
1082         work_area->setUpdatesEnabled(false);
1083         removeTab(index);
1084         delete work_area;
1085
1086         if (count()) {
1087                 // make sure the next work area is enabled.
1088                 currentWidget()->setUpdatesEnabled(true);
1089                 // Hide tabbar if there's only one tab.
1090                 showBar(count() > 1);
1091         }
1092         return true;
1093 }
1094
1095
1096 void TabWorkArea::on_currentTabChanged(int i)
1097 {
1098         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i));
1099         BOOST_ASSERT(wa);
1100         BufferView & bv = wa->bufferView();
1101         bv.cursor().fixIfBroken();
1102         bv.updateMetrics();
1103         wa->setUpdatesEnabled(true);
1104         wa->redraw();
1105         wa->setFocus();
1106         ///
1107         currentWorkAreaChanged(wa);
1108
1109         LYXERR(Debug::GUI, "currentTabChanged " << i
1110                 << "File" << bv.buffer().absFileName());
1111 }
1112
1113
1114 void TabWorkArea::closeCurrentTab()
1115 {
1116         lyx::dispatch(FuncRequest(LFUN_BUFFER_CLOSE));
1117 }
1118
1119
1120 void TabWorkArea::updateTabText(GuiWorkArea * wa)
1121 {
1122         int const i = indexOf(wa);
1123         if (i < 0)
1124                 return;
1125         setTabText(i, wa->windowTitle());
1126 }
1127
1128 } // namespace frontend
1129 } // namespace lyx
1130
1131 #include "GuiWorkArea_moc.cpp"