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/Dialogs.h"  // only used in setReadOnly
  45 #include "frontends/FontMetrics.h"
  46 #include "frontends/WorkAreaManager.h"
  47
  48 #include <QInputContext>
  49 #include <QLayout>
  50 #include <QMainWindow>
  51 #include <QPainter>
  52 #include <QToolButton>
  53 #include <QPalette>
  54 #include <QScrollBar>
  55 #include <QTabBar>
  56 #include <QTimer>
  57
  58 #include <boost/bind.hpp>
  59 #include <boost/current_function.hpp>
  60
  61 #ifdef Q_WS_X11
  62 #include <QX11Info>
  63 extern "C" int XEventsQueued(Display *display, int mode);
  64 #endif
  65
  66 #ifdef Q_WS_WIN
  67 int const CursorWidth = 2;
  68 #else
  69 int const CursorWidth = 1;
  70 #endif
  71
  72 #undef KeyPress
  73 #undef NoModifier
  74
  75 using std::endl;
  76 using std::min;
  77 using std::max;
  78 using std::string;
  79
  80 namespace lyx {
  81
  82 using support::FileName;
  83 using support::ForkedcallsController;
  84
  85
  86 /// return the LyX mouse button state from Qt's
  87 static mouse_button::state q_button_state(Qt::MouseButton button)
  88 {
  89         mouse_button::state b = mouse_button::none;
  90         switch (button) {
  91                 case Qt::LeftButton:
  92                         b = mouse_button::button1;
  93                         break;
  94                 case Qt::MidButton:
  95                         b = mouse_button::button2;
  96                         break;
  97                 case Qt::RightButton:
  98                         b = mouse_button::button3;
  99                         break;
 100                 default:
 101                         break;
 102         }
 103         return b;
 104 }
 105
 106
 107 /// return the LyX mouse button state from Qt's
 108 mouse_button::state q_motion_state(Qt::MouseButtons state)
 109 {
 110         mouse_button::state b = mouse_button::none;
 111         if (state & Qt::LeftButton)
 112                 b |= mouse_button::button1;
 113         if (state & Qt::MidButton)
 114                 b |= mouse_button::button2;
 115         if (state & Qt::RightButton)
 116                 b |= mouse_button::button3;
 117         return b;
 118 }
 119
 120
 121 namespace frontend {
 122
 123 class CursorWidget {
 124 public:
 125         CursorWidget() {}
 126
 127         void draw(QPainter & painter)
 128         {
 129                 if (show_ && rect_.isValid()) {
 130                         switch (shape_) {
 131                         case L_SHAPE:
 132                                 painter.fillRect(rect_.x(), rect_.y(), CursorWidth, rect_.height(), color_);
 133                                 painter.setPen(color_);
 134                                 painter.drawLine(rect_.bottomLeft().x() + CursorWidth, rect_.bottomLeft().y(),
 135                                                                                                  rect_.bottomRight().x(), rect_.bottomLeft().y());
 136                                 break;
 137
 138                         case REVERSED_L_SHAPE:
 139                                 painter.fillRect(rect_.x() + rect_.height() / 3, rect_.y(), CursorWidth, rect_.height(), color_);
 140                                 painter.setPen(color_);
 141                                 painter.drawLine(rect_.bottomRight().x() - CursorWidth, rect_.bottomLeft().y(),
 142                                                                                                          rect_.bottomLeft().x(), rect_.bottomLeft().y());
 143                                 break;
 144
 145                         default:
 146                                 painter.fillRect(rect_, color_);
 147                                 break;
 148                         }
 149                 }
 150         }
 151
 152         void update(int x, int y, int h, CursorShape shape)
 153         {
 154                 color_ = guiApp->colorCache().get(Color_cursor);
 155                 shape_ = shape;
 156                 switch (shape) {
 157                 case L_SHAPE:
 158                         rect_ = QRect(x, y, CursorWidth + h / 3, h);
 159                         break;
 160                 case REVERSED_L_SHAPE:
 161                         rect_ = QRect(x - h / 3, y, CursorWidth + h / 3, h);
 162                         break;
 163                 default:
 164                         rect_ = QRect(x, y, CursorWidth, h);
 165                         break;
 166                 }
 167         }
 168
 169         void show(bool set_show = true) { show_ = set_show; }
 170         void hide() { show_ = false; }
 171
 172         QRect const & rect() { return rect_; }
 173
 174 private:
 175         ///
 176         CursorShape shape_;
 177         ///
 178         bool show_;
 179         ///
 180         QColor color_;
 181         ///
 182         QRect rect_;
 183 };
 184
 185
 186 // This is a 'heartbeat' generating synthetic mouse move events when the
 187 // cursor is at the top or bottom edge of the viewport. One scroll per 0.2 s
 188 SyntheticMouseEvent::SyntheticMouseEvent()
 189         : timeout(200), restart_timeout(true),
 190           x_old(-1), y_old(-1), scrollbar_value_old(-1.0)
 191 {}
 192
 193
 194
 195 // All the below connection objects are needed because of a bug in some
 196 // versions of GCC (<=2.96 are on the suspects list.) By having and assigning
 197 // to these connections we avoid a segfault upon startup, and also at exit.
 198 // (Lgb)
 199
 200 static boost::signals::connection timecon;
 201
 202
 203 GuiWorkArea::GuiWorkArea(Buffer & buffer, GuiView & lv)
 204         : buffer_view_(new BufferView(buffer)), lyx_view_(&lv),
 205           cursor_visible_(false), cursor_timeout_(400),
 206     need_resize_(false), schedule_redraw_(false),
 207                 preedit_lines_(1)
 208 {
 209         buffer.workAreaManager().add(this);
 210         // Setup the signals
 211         timecon = cursor_timeout_.timeout
 212                 .connect(boost::bind(&GuiWorkArea::toggleCursor, this));
 213
 214         cursor_timeout_.start();
 215
 216         screen_ = QPixmap(viewport()->width(), viewport()->height());
 217         cursor_ = new frontend::CursorWidget();
 218         cursor_->hide();
 219
 220         setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
 221         setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 222         setAcceptDrops(true);
 223         setMouseTracking(true);
 224         setMinimumSize(100, 70);
 225         updateWindowTitle();
 226
 227         viewport()->setAutoFillBackground(false);
 228         // We don't need double-buffering nor SystemBackground on
 229         // the viewport because we have our own backing pixmap.
 230         viewport()->setAttribute(Qt::WA_NoSystemBackground);
 231
 232         setFocusPolicy(Qt::WheelFocus);
 233
 234         viewport()->setCursor(Qt::IBeamCursor);
 235
 236         synthetic_mouse_event_.timeout.timeout.connect(
 237                 boost::bind(&GuiWorkArea::generateSyntheticMouseEvent,
 238                                         this));
 239
 240         // Initialize the vertical Scroll Bar
 241         QObject::connect(verticalScrollBar(), SIGNAL(actionTriggered(int)),
 242                 this, SLOT(adjustViewWithScrollBar(int)));
 243
 244         // disable context menu for the scrollbar
 245         verticalScrollBar()->setContextMenuPolicy(Qt::NoContextMenu);
 246
 247         // PageStep only depends on the viewport height.
 248         verticalScrollBar()->setPageStep(viewport()->height());
 249
 250         LYXERR(Debug::GUI) << BOOST_CURRENT_FUNCTION
 251                 << "\n viewport width\t" << viewport()->width()
 252                 << "\n viewport height\t" << viewport()->height()
 253                 << endl;
 254
 255         // Enables input methods for asian languages.
 256         // Must be set when creating custom text editing widgets.
 257         setAttribute(Qt::WA_InputMethodEnabled, true);
 258 }
 259
 260
 261
 262 GuiWorkArea::~GuiWorkArea()
 263 {
 264         buffer_view_->buffer().workAreaManager().remove(this);
 265         delete buffer_view_;
 266 }
 267
 268
 269 void GuiWorkArea::close()
 270 {
 271         lyx_view_->removeWorkArea(this);
 272 }
 273
 274
 275 BufferView & GuiWorkArea::bufferView()
 276 {
 277         return *buffer_view_;
 278 }
 279
 280
 281 BufferView const & GuiWorkArea::bufferView() const
 282 {
 283         return *buffer_view_;
 284 }
 285
 286
 287 void GuiWorkArea::stopBlinkingCursor()
 288 {
 289         cursor_timeout_.stop();
 290         hideCursor();
 291 }
 292
 293
 294 void GuiWorkArea::startBlinkingCursor()
 295 {
 296         showCursor();
 297         cursor_timeout_.restart();
 298 }
 299
 300
 301 void GuiWorkArea::redraw()
 302 {
 303         if (!isVisible())
 304                 // No need to redraw in this case.
 305                 return;
 306
 307         // No need to do anything if this is the current view. The BufferView
 308         // metrics are already up to date.
 309         if (lyx_view_ != theApp()->currentView()) {
 310                 // FIXME: it would be nice to optimize for the off-screen case.
 311                 buffer_view_->updateMetrics();
 312                 buffer_view_->cursor().fixIfBroken();
 313         }
 314
 315         updateScrollbar();
 316
 317         // update cursor position, because otherwise it has to wait until
 318         // the blinking interval is over
 319         if (cursor_visible_) {
 320                 hideCursor();
 321                 showCursor();
 322         }
 323
 324         ViewMetricsInfo const & vi = buffer_view_->viewMetricsInfo();
 325
 326         LYXERR(Debug::WORKAREA) << "WorkArea::redraw screen" << endl;
 327
 328         int const ymin = std::max(vi.y1, 0);
 329         int const ymax = vi.p2 < vi.size - 1 ? vi.y2 : viewport()->height();
 330
 331         updateScreen();
 332         update(0, ymin, viewport()->width(), ymax - ymin);
 333
 334         //LYXERR(Debug::WORKAREA)
 335         //<< "  ymin = " << ymin << "  width() = " << width()
 336 //              << "  ymax-ymin = " << ymax-ymin << std::endl;
 337
 338         if (lyxerr.debugging(Debug::WORKAREA))
 339                 buffer_view_->coordCache().dump();
 340 }
 341
 342
 343 void GuiWorkArea::processKeySym(KeySymbol const & key, KeyModifier mod)
 344 {
 345         // In order to avoid bad surprise in the middle of an operation,
 346         // we better stop the blinking cursor.
 347         stopBlinkingCursor();
 348
 349         theLyXFunc().setLyXView(lyx_view_);
 350         theLyXFunc().processKeySym(key, mod);
 351 }
 352
 353
 354 void GuiWorkArea::dispatch(FuncRequest const & cmd0, KeyModifier mod)
 355 {
 356         // Handle drag&drop
 357         if (cmd0.action == LFUN_FILE_OPEN) {
 358                 lyx_view_->dispatch(cmd0);
 359                 return;
 360         }
 361
 362         theLyXFunc().setLyXView(lyx_view_);
 363
 364         FuncRequest cmd;
 365
 366         if (cmd0.action == LFUN_MOUSE_PRESS) {
 367                 if (mod == ShiftModifier)
 368                         cmd = FuncRequest(cmd0, "region-select");
 369                 else if (mod == ControlModifier)
 370                         cmd = FuncRequest(cmd0, "paragraph-select");
 371                 else
 372                         cmd = cmd0;
 373         }
 374         else
 375                 cmd = cmd0;
 376
 377         // In order to avoid bad surprise in the middle of an operation, we better stop
 378         // the blinking cursor.
 379         if (!(cmd.action == LFUN_MOUSE_MOTION
 380                 && cmd.button() == mouse_button::none))
 381                 stopBlinkingCursor();
 382
 383         buffer_view_->mouseEventDispatch(cmd);
 384
 385         // Skip these when selecting
 386         if (cmd.action != LFUN_MOUSE_MOTION) {
 387                 lyx_view_->updateLayoutChoice(false);
 388                 lyx_view_->updateToolbars();
 389         }
 390
 391         // GUI tweaks except with mouse motion with no button pressed.
 392         if (!(cmd.action == LFUN_MOUSE_MOTION
 393                 && cmd.button() == mouse_button::none)) {
 394                 // Slight hack: this is only called currently when we
 395                 // clicked somewhere, so we force through the display
 396                 // of the new status here.
 397                 lyx_view_->clearMessage();
 398
 399                 // Show the cursor immediately after any operation.
 400                 startBlinkingCursor();
 401         }
 402 }
 403
 404
 405 void GuiWorkArea::resizeBufferView()
 406 {
 407         // WARNING: Please don't put any code that will trigger a repaint here!
 408         // We are already inside a paint event.
 409         lyx_view_->setBusy(true);
 410         buffer_view_->resize(viewport()->width(), viewport()->height());
 411         lyx_view_->updateLayoutChoice(false);
 412         lyx_view_->setBusy(false);
 413 }
 414
 415
 416 void GuiWorkArea::showCursor()
 417 {
 418         if (cursor_visible_)
 419                 return;
 420
 421         CursorShape shape = BAR_SHAPE;
 422
 423         Font const & realfont = buffer_view_->cursor().real_current_font;
 424         BufferParams const & bp = buffer_view_->buffer().params();
 425         bool const samelang = realfont.language() == bp.language;
 426         bool const isrtl = realfont.isVisibleRightToLeft();
 427
 428         if (!samelang || isrtl != bp.language->rightToLeft()) {
 429                 shape = L_SHAPE;
 430                 if (isrtl)
 431                         shape = REVERSED_L_SHAPE;
 432         }
 433
 434         // The ERT language hack needs fixing up
 435         if (realfont.language() == latex_language)
 436                 shape = BAR_SHAPE;
 437
 438         Font const font = buffer_view_->cursor().getFont();
 439         FontMetrics const & fm = theFontMetrics(font);
 440         int const asc = fm.maxAscent();
 441         int const des = fm.maxDescent();
 442         int h = asc + des;
 443         int x = 0;
 444         int y = 0;
 445         buffer_view_->cursor().getPos(x, y);
 446         y -= asc;
 447
 448         // if it doesn't touch the screen, don't try to show it
 449         if (y + h < 0 || y >= viewport()->height())
 450                 return;
 451
 452         cursor_visible_ = true;
 453         showCursor(x, y, h, shape);
 454 }
 455
 456
 457 void GuiWorkArea::hideCursor()
 458 {
 459         if (!cursor_visible_)
 460                 return;
 461
 462         cursor_visible_ = false;
 463         removeCursor();
 464 }
 465
 466
 467 void GuiWorkArea::toggleCursor()
 468 {
 469         if (cursor_visible_)
 470                 hideCursor();
 471         else
 472                 showCursor();
 473
 474         // Use this opportunity to deal with any child processes that
 475         // have finished but are waiting to communicate this fact
 476         // to the rest of LyX.
 477         ForkedcallsController & fcc = ForkedcallsController::get();
 478         fcc.handleCompletedProcesses();
 479
 480         cursor_timeout_.restart();
 481 }
 482
 483
 484 void GuiWorkArea::updateScrollbar()
 485 {
 486         if (verticalScrollBarPolicy() != Qt::ScrollBarAlwaysOn)
 487                 setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
 488         verticalScrollBar()->setTracking(false);
 489
 490         buffer_view_->updateScrollbar();
 491         ScrollbarParameters const & scroll_ = buffer_view_->scrollbarParameters();
 492
 493         // do what cursor movement does (some grey)
 494         int const h = scroll_.height + viewport()->height() / 4;
 495         int scroll_max_ = std::max(0, h - viewport()->height());
 496
 497         verticalScrollBar()->setRange(0, scroll_max_);
 498         verticalScrollBar()->setSliderPosition(scroll_.position);
 499         verticalScrollBar()->setSingleStep(scroll_.lineScrollHeight);
 500         verticalScrollBar()->setValue(scroll_.position);
 501
 502         verticalScrollBar()->setTracking(true);
 503 }
 504
 505
 506 void GuiWorkArea::adjustViewWithScrollBar(int action)
 507 {
 508         stopBlinkingCursor();
 509         if (action == QAbstractSlider::SliderPageStepAdd)
 510                 buffer_view_->scrollDown(viewport()->height());
 511         else if (action == QAbstractSlider::SliderPageStepSub)
 512                 buffer_view_->scrollUp(viewport()->height());
 513         else
 514                 buffer_view_->scrollDocView(verticalScrollBar()->sliderPosition());
 515
 516         if (lyxrc.cursor_follows_scrollbar) {
 517                 buffer_view_->setCursorFromScrollbar();
 518                 lyx_view_->updateLayoutChoice(false);
 519         }
 520         // Show the cursor immediately after any operation.
 521         startBlinkingCursor();
 522         QApplication::syncX();
 523 }
 524
 525
 526 void GuiWorkArea::focusInEvent(QFocusEvent * /*event*/)
 527 {
 528         // Repaint the whole screen.
 529         // Note: this is different from redraw() as only the backing pixmap
 530         // will be redrawn, which is cheap.
 531         viewport()->repaint();
 532
 533         startBlinkingCursor();
 534 }
 535
 536
 537 void GuiWorkArea::focusOutEvent(QFocusEvent * /*event*/)
 538 {
 539         stopBlinkingCursor();
 540 }
 541
 542
 543 void GuiWorkArea::mousePressEvent(QMouseEvent * e)
 544 {
 545         if (dc_event_.active && dc_event_ == *e) {
 546                 dc_event_.active = false;
 547                 FuncRequest cmd(LFUN_MOUSE_TRIPLE, e->x(), e->y(),
 548                         q_button_state(e->button()));
 549                 dispatch(cmd);
 550                 return;
 551         }
 552
 553         inputContext()->reset();
 554
 555         FuncRequest const cmd(LFUN_MOUSE_PRESS, e->x(), e->y(),
 556                 q_button_state(e->button()));
 557         dispatch(cmd, q_key_state(e->modifiers()));
 558 }
 559
 560
 561 void GuiWorkArea::mouseReleaseEvent(QMouseEvent * e)
 562 {
 563         if (synthetic_mouse_event_.timeout.running())
 564                 synthetic_mouse_event_.timeout.stop();
 565
 566         FuncRequest const cmd(LFUN_MOUSE_RELEASE, e->x(), e->y(),
 567                               q_button_state(e->button()));
 568         dispatch(cmd);
 569 }
 570
 571
 572 void GuiWorkArea::mouseMoveEvent(QMouseEvent * e)
 573 {
 574         // we kill the triple click if we move
 575         doubleClickTimeout();
 576         FuncRequest cmd(LFUN_MOUSE_MOTION, e->x(), e->y(),
 577                               q_motion_state(e->buttons()));
 578
 579         // If we're above or below the work area...
 580         if (e->y() <= 20 || e->y() >= viewport()->height() - 20) {
 581                 // Make sure only a synthetic event can cause a page scroll,
 582                 // so they come at a steady rate:
 583                 if (e->y() <= 20)
 584                         // _Force_ a scroll up:
 585                         cmd.y = -40;
 586                 else
 587                         cmd.y = viewport()->height();
 588                 // Store the event, to be handled when the timeout expires.
 589                 synthetic_mouse_event_.cmd = cmd;
 590
 591                 if (synthetic_mouse_event_.timeout.running())
 592                         // Discard the event. Note that it _may_ be handled
 593                         // when the timeout expires if
 594                         // synthetic_mouse_event_.cmd has not been overwritten.
 595                         // Ie, when the timeout expires, we handle the
 596                         // most recent event but discard all others that
 597                         // occurred after the one used to start the timeout
 598                         // in the first place.
 599                         return;
 600                 else {
 601                         synthetic_mouse_event_.restart_timeout = true;
 602                         synthetic_mouse_event_.timeout.start();
 603                         // Fall through to handle this event...
 604                 }
 605
 606         } else if (synthetic_mouse_event_.timeout.running()) {
 607                 // Store the event, to be possibly handled when the timeout
 608                 // expires.
 609                 // Once the timeout has expired, normal control is returned
 610                 // to mouseMoveEvent (restart_timeout = false).
 611                 // This results in a much smoother 'feel' when moving the
 612                 // mouse back into the work area.
 613                 synthetic_mouse_event_.cmd = cmd;
 614                 synthetic_mouse_event_.restart_timeout = false;
 615                 return;
 616         }
 617
 618         // Has anything changed on-screen since the last QMouseEvent
 619         // was received?
 620         double const scrollbar_value = verticalScrollBar()->value();
 621         if (e->x() != synthetic_mouse_event_.x_old ||
 622             e->y() != synthetic_mouse_event_.y_old ||
 623             scrollbar_value != synthetic_mouse_event_.scrollbar_value_old) {
 624                 // Yes it has. Store the params used to check this.
 625                 synthetic_mouse_event_.x_old = e->x();
 626                 synthetic_mouse_event_.y_old = e->y();
 627                 synthetic_mouse_event_.scrollbar_value_old = scrollbar_value;
 628
 629                 // ... and dispatch the event to the LyX core.
 630                 dispatch(cmd);
 631         }
 632 }
 633
 634
 635 void GuiWorkArea::wheelEvent(QWheelEvent * e)
 636 {
 637         // Wheel rotation by one notch results in a delta() of 120 (see
 638         // documentation of QWheelEvent)
 639         int const lines = qApp->wheelScrollLines() * e->delta() / 120;
 640         verticalScrollBar()->setValue(verticalScrollBar()->value() -
 641                         lines *  verticalScrollBar()->singleStep());
 642         adjustViewWithScrollBar();
 643 }
 644
 645
 646 void GuiWorkArea::generateSyntheticMouseEvent()
 647 {
 648 // Set things off to generate the _next_ 'pseudo' event.
 649         if (synthetic_mouse_event_.restart_timeout)
 650                 synthetic_mouse_event_.timeout.start();
 651
 652         // Has anything changed on-screen since the last timeout signal
 653         // was received?
 654         double const scrollbar_value = verticalScrollBar()->value();
 655         if (scrollbar_value != synthetic_mouse_event_.scrollbar_value_old) {
 656                 // Yes it has. Store the params used to check this.
 657                 synthetic_mouse_event_.scrollbar_value_old = scrollbar_value;
 658
 659                 // ... and dispatch the event to the LyX core.
 660                 dispatch(synthetic_mouse_event_.cmd);
 661         }
 662 }
 663
 664
 665 void GuiWorkArea::keyPressEvent(QKeyEvent * ev)
 666 {
 667         // do nothing if there are other events
 668         // (the auto repeated events come too fast)
 669         // \todo FIXME: remove hard coded Qt keys, process the key binding
 670 #ifdef Q_WS_X11
 671         if (XEventsQueued(QX11Info::display(), 0) > 1 && ev->isAutoRepeat()
 672                         && (Qt::Key_PageDown || Qt::Key_PageUp)) {
 673                 LYXERR(Debug::KEY)
 674                         << BOOST_CURRENT_FUNCTION << endl
 675                         << "system is busy: scroll key event ignored" << endl;
 676                 ev->ignore();
 677                 return;
 678         }
 679 #endif
 680
 681         LYXERR(Debug::KEY) << BOOST_CURRENT_FUNCTION
 682                 << " count=" << ev->count()
 683                 << " text=" << fromqstr(ev->text())
 684                 << " isAutoRepeat=" << ev->isAutoRepeat()
 685                 << " key=" << ev->key()
 686                 << endl;
 687
 688         KeySymbol sym;
 689         setKeySymbol(&sym, ev);
 690         processKeySym(sym, q_key_state(ev->modifiers()));
 691 }
 692
 693
 694 void GuiWorkArea::doubleClickTimeout()
 695 {
 696         dc_event_.active = false;
 697 }
 698
 699
 700 void GuiWorkArea::mouseDoubleClickEvent(QMouseEvent * ev)
 701 {
 702         dc_event_ = DoubleClick(ev);
 703         QTimer::singleShot(QApplication::doubleClickInterval(), this,
 704                            SLOT(doubleClickTimeout()));
 705         FuncRequest cmd(LFUN_MOUSE_DOUBLE,
 706                         ev->x(), ev->y(),
 707                         q_button_state(ev->button()));
 708         dispatch(cmd);
 709 }
 710
 711
 712 void GuiWorkArea::resizeEvent(QResizeEvent * ev)
 713 {
 714         QAbstractScrollArea::resizeEvent(ev);
 715         need_resize_ = true;
 716 }
 717
 718
 719 void GuiWorkArea::update(int x, int y, int w, int h)
 720 {
 721         viewport()->repaint(x, y, w, h);
 722 }
 723
 724
 725 void GuiWorkArea::paintEvent(QPaintEvent * ev)
 726 {
 727         QRect const rc = ev->rect();
 728         /*
 729         LYXERR(Debug::PAINTING) << "paintEvent begin: x: " << rc.x()
 730                 << " y: " << rc.y()
 731                 << " w: " << rc.width()
 732                 << " h: " << rc.height() << endl;
 733         */
 734
 735         if (need_resize_) {
 736                 verticalScrollBar()->setPageStep(viewport()->height());
 737                 screen_ = QPixmap(viewport()->width(), viewport()->height());
 738                 resizeBufferView();
 739                 updateScreen();
 740                 hideCursor();
 741                 showCursor();
 742                 need_resize_ = false;
 743         }
 744
 745         QPainter pain(viewport());
 746         pain.drawPixmap(rc, screen_, rc);
 747         cursor_->draw(pain);
 748 }
 749
 750
 751 void GuiWorkArea::updateScreen()
 752 {
 753         GuiPainter pain(&screen_);
 754         verticalScrollBar()->show();
 755         buffer_view_->draw(pain);
 756 }
 757
 758
 759 void GuiWorkArea::showCursor(int x, int y, int h, CursorShape shape)
 760 {
 761         if (schedule_redraw_) {
 762                 buffer_view_->updateMetrics();
 763                 updateScreen();
 764                 viewport()->update(QRect(0, 0, viewport()->width(), viewport()->height()));
 765                 schedule_redraw_ = false;
 766                 // Show the cursor immediately after the update.
 767                 hideCursor();
 768                 toggleCursor();
 769                 return;
 770         }
 771
 772         cursor_->update(x, y, h, shape);
 773         cursor_->show();
 774         viewport()->update(cursor_->rect());
 775 }
 776
 777
 778 void GuiWorkArea::removeCursor()
 779 {
 780         cursor_->hide();
 781         //if (!qApp->focusWidget())
 782                 viewport()->update(cursor_->rect());
 783 }
 784
 785
 786 void GuiWorkArea::inputMethodEvent(QInputMethodEvent * e)
 787 {
 788         QString const & commit_string = e->commitString();
 789         docstring const & preedit_string
 790                 = qstring_to_ucs4(e->preeditString());
 791
 792         if (!commit_string.isEmpty()) {
 793
 794                 LYXERR(Debug::KEY) << BOOST_CURRENT_FUNCTION
 795                         << " preeditString =" << fromqstr(e->preeditString())
 796                         << " commitString  =" << fromqstr(e->commitString())
 797                         << endl;
 798
 799                 int key = 0;
 800
 801                 // FIXME Iwami 04/01/07: we should take care also of UTF16 surrogates here.
 802                 for (int i = 0; i < commit_string.size(); ++i) {
 803                         QKeyEvent ev(QEvent::KeyPress, key, Qt::NoModifier, commit_string[i]);
 804                         keyPressEvent(&ev);
 805                 }
 806         }
 807
 808         // Hide the cursor during the kana-kanji transformation.
 809         if (preedit_string.empty())
 810                 startBlinkingCursor();
 811         else
 812                 stopBlinkingCursor();
 813
 814         // last_width : for checking if last preedit string was/wasn't empty.
 815         static bool last_width = false;
 816         if (!last_width && preedit_string.empty()) {
 817                 // if last_width is last length of preedit string.
 818                 e->accept();
 819                 return;
 820         }
 821
 822         GuiPainter pain(&screen_);
 823         buffer_view_->updateMetrics();
 824         buffer_view_->draw(pain);
 825         FontInfo font = buffer_view_->cursor().getFont().fontInfo();
 826         FontMetrics const & fm = theFontMetrics(font);
 827         int height = fm.maxHeight();
 828         int cur_x = cursor_->rect().left();
 829         int cur_y = cursor_->rect().bottom();
 830
 831         // redraw area of preedit string.
 832         update(0, cur_y - height, viewport()->width(),
 833                 (height + 1) * preedit_lines_);
 834
 835         if (preedit_string.empty()) {
 836                 last_width = false;
 837                 preedit_lines_ = 1;
 838                 e->accept();
 839                 return;
 840         }
 841         last_width = true;
 842
 843         // att : stores an IM attribute.
 844         QList<QInputMethodEvent::Attribute> const & att = e->attributes();
 845
 846         // get attributes of input method cursor.
 847         // cursor_pos : cursor position in preedit string.
 848         size_t cursor_pos = 0;
 849         bool cursor_is_visible = false;
 850         for (int i = 0; i < att.size(); ++i) {
 851                 if (att.at(i).type == QInputMethodEvent::Cursor) {
 852                         cursor_pos = att.at(i).start;
 853                         cursor_is_visible = att.at(i).length != 0;
 854                         break;
 855                 }
 856         }
 857
 858         size_t preedit_length = preedit_string.length();
 859
 860         // get position of selection in input method.
 861         // FIXME: isn't there a way to do this simplier?
 862         // rStart : cursor position in selected string in IM.
 863         size_t rStart = 0;
 864         // rLength : selected string length in IM.
 865         size_t rLength = 0;
 866         if (cursor_pos < preedit_length) {
 867                 for (int i = 0; i < att.size(); ++i) {
 868                         if (att.at(i).type == QInputMethodEvent::TextFormat) {
 869                                 if (att.at(i).start <= int(cursor_pos)
 870                                         && int(cursor_pos) < att.at(i).start + att.at(i).length) {
 871                                                 rStart = att.at(i).start;
 872                                                 rLength = att.at(i).length;
 873                                                 if (!cursor_is_visible)
 874                                                         cursor_pos += rLength;
 875                                                 break;
 876                                 }
 877                         }
 878                 }
 879         }
 880         else {
 881                 rStart = cursor_pos;
 882                 rLength = 0;
 883         }
 884
 885         int const right_margin = rightMargin();
 886         Painter::preedit_style ps;
 887         // Most often there would be only one line:
 888         preedit_lines_ = 1;
 889         for (size_t pos = 0; pos != preedit_length; ++pos) {
 890                 char_type const typed_char = preedit_string[pos];
 891                 // reset preedit string style
 892                 ps = Painter::preedit_default;
 893
 894                 // if we reached the right extremity of the screen, go to next line.
 895                 if (cur_x + fm.width(typed_char) > viewport()->width() - right_margin) {
 896                         cur_x = right_margin;
 897                         cur_y += height + 1;
 898                         ++preedit_lines_;
 899                 }
 900                 // preedit strings are displayed with dashed underline
 901                 // and partial strings are displayed white on black indicating
 902                 // that we are in selecting mode in the input method.
 903                 // FIXME: rLength == preedit_length is not a changing condition
 904                 // FIXME: should be put out of the loop.
 905                 if (pos >= rStart
 906                         && pos < rStart + rLength
 907                         && !(cursor_pos < rLength && rLength == preedit_length))
 908                         ps = Painter::preedit_selecting;
 909
 910                 if (pos == cursor_pos
 911                         && (cursor_pos < rLength && rLength == preedit_length))
 912                         ps = Painter::preedit_cursor;
 913
 914                 // draw one character and update cur_x.
 915                 cur_x += pain.preeditText(cur_x, cur_y, typed_char, font, ps);
 916         }
 917
 918         // update the preedit string screen area.
 919         update(0, cur_y - preedit_lines_*height, viewport()->width(),
 920                 (height + 1) * preedit_lines_);
 921
 922         // Don't forget to accept the event!
 923         e->accept();
 924 }
 925
 926
 927 QVariant GuiWorkArea::inputMethodQuery(Qt::InputMethodQuery query) const
 928 {
 929         QRect cur_r(0,0,0,0);
 930         switch (query) {
 931                 // this is the CJK-specific composition window position.
 932                 case Qt::ImMicroFocus:
 933                         cur_r = cursor_->rect();
 934                         if (preedit_lines_ != 1)
 935                                 cur_r.moveLeft(10);
 936                         cur_r.moveBottom(cur_r.bottom() + cur_r.height() * preedit_lines_);
 937                         // return lower right of cursor in LyX.
 938                         return cur_r;
 939                 default:
 940                         return QWidget::inputMethodQuery(query);
 941         }
 942 }
 943
 944
 945 void GuiWorkArea::updateWindowTitle()
 946 {
 947         docstring maximize_title;
 948         docstring minimize_title;
 949
 950         Buffer & buf = buffer_view_->buffer();
 951         FileName const fileName = buf.fileName();
 952         if (!fileName.empty()) {
 953                 maximize_title = fileName.displayName(30);
 954                 minimize_title = from_utf8(fileName.onlyFileName());
 955                 if (!buf.isClean()) {
 956                         maximize_title += _(" (changed)");
 957                         minimize_title += char_type('*');
 958                 }
 959                 if (buf.isReadonly())
 960                         maximize_title += _(" (read only)");
 961         }
 962
 963         QString title = windowTitle();
 964         QString new_title = toqstr(maximize_title);
 965         if (title == new_title)
 966                 return;
 967
 968         QWidget::setWindowTitle(new_title);
 969         QWidget::setWindowIconText(toqstr(minimize_title));
 970         titleChanged(this);
 971 }
 972
 973
 974 void GuiWorkArea::setReadOnly(bool)
 975 {
 976         updateWindowTitle();
 977         if (this == lyx_view_->currentWorkArea())
 978                 lyx_view_->getDialogs().updateBufferDependent(false);
 979 }
 980
 981
 982 ////////////////////////////////////////////////////////////////////
 983 //
 984 // TabWorkArea
 985 //
 986 ////////////////////////////////////////////////////////////////////
 987
 988 TabWorkArea::TabWorkArea(QWidget * parent) : QTabWidget(parent)
 989 {
 990         QPalette pal = palette();
 991         pal.setColor(QPalette::Active, QPalette::Button,
 992                 pal.color(QPalette::Active, QPalette::Window));
 993         pal.setColor(QPalette::Disabled, QPalette::Button,
 994                 pal.color(QPalette::Disabled, QPalette::Window));
 995         pal.setColor(QPalette::Inactive, QPalette::Button,
 996                 pal.color(QPalette::Inactive, QPalette::Window));
 997
 998         QToolButton * closeTabButton = new QToolButton(this);
 999     closeTabButton->setPalette(pal);
1000         closeTabButton->setIcon(QIcon(":/images/closetab.png"));
1001         closeTabButton->setText("Close");
1002         closeTabButton->setAutoRaise(true);
1003         closeTabButton->setCursor(Qt::ArrowCursor);
1004         closeTabButton->setToolTip(tr("Close tab"));
1005         closeTabButton->setEnabled(true);
1006
1007         QObject::connect(this, SIGNAL(currentChanged(int)),
1008                 this, SLOT(on_currentTabChanged(int)));
1009         QObject::connect(closeTabButton, SIGNAL(clicked()),
1010                 this, SLOT(closeCurrentTab()));
1011
1012         setCornerWidget(closeTabButton);
1013         setUsesScrollButtons(true);
1014 }
1015
1016
1017 void TabWorkArea::showBar(bool show)
1018 {
1019         tabBar()->setVisible(show);
1020 }
1021
1022
1023 GuiWorkArea * TabWorkArea::currentWorkArea()
1024 {
1025         if (count() == 0)
1026                 return 0;
1027
1028         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(currentWidget());
1029         BOOST_ASSERT(wa);
1030         return wa;
1031 }
1032
1033
1034 GuiWorkArea * TabWorkArea::workArea(Buffer & buffer)
1035 {
1036         for (int i = 0; i != count(); ++i) {
1037                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i));
1038                 BOOST_ASSERT(wa);
1039                 if (&wa->bufferView().buffer() == &buffer)
1040                         return wa;
1041         }
1042         return 0;
1043 }
1044
1045
1046 void TabWorkArea::closeAll()
1047 {
1048         while (count()) {
1049                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(0));
1050                 BOOST_ASSERT(wa);
1051                 removeTab(0);
1052                 delete wa;
1053         }
1054 }
1055
1056
1057 bool TabWorkArea::setCurrentWorkArea(GuiWorkArea * work_area)
1058 {
1059         BOOST_ASSERT(work_area);
1060         int index = indexOf(work_area);
1061         if (index == -1)
1062                 return false;
1063
1064         if (index == currentIndex())
1065                 // Make sure the work area is up to date.
1066                 on_currentTabChanged(index);
1067         else
1068                 // Switch to the work area.
1069                 setCurrentIndex(index);
1070         work_area->setFocus();
1071
1072         return true;
1073 }
1074
1075
1076 bool TabWorkArea::removeWorkArea(GuiWorkArea * work_area)
1077 {
1078         BOOST_ASSERT(work_area);
1079         int index = indexOf(work_area);
1080         if (index == -1)
1081                 return false;
1082
1083         work_area->setUpdatesEnabled(false);
1084         removeTab(index);
1085         delete work_area;
1086
1087         if (count()) {
1088                 // make sure the next work area is enabled.
1089                 currentWidget()->setUpdatesEnabled(true);
1090                 // Hide tabbar if there's only one tab.
1091                 showBar(count() > 1);
1092         }
1093         return true;
1094 }
1095
1096
1097 void TabWorkArea::on_currentTabChanged(int i)
1098 {
1099         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i));
1100         BOOST_ASSERT(wa);
1101         BufferView & bv = wa->bufferView();
1102         bv.updateMetrics();
1103         bv.cursor().fixIfBroken();
1104         wa->setUpdatesEnabled(true);
1105         wa->redraw();
1106         wa->setFocus();
1107         ///
1108         currentWorkAreaChanged(wa);
1109
1110         LYXERR(Debug::GUI) << "currentTabChanged " << i
1111                 << "File" << bv.buffer().absFileName() << endl;
1112 }
1113
1114
1115 void TabWorkArea::closeCurrentTab()
1116 {
1117         lyx::dispatch(FuncRequest(LFUN_BUFFER_CLOSE));
1118 }
1119
1120
1121 void TabWorkArea::updateTabText(GuiWorkArea * wa)
1122 {
1123         int const i = indexOf(wa);
1124         if (i < 0)
1125                 return;
1126         setTabText(i, wa->windowTitle());
1127 }
1128
1129 } // namespace frontend
1130 } // namespace lyx
1131
1132 #include "GuiWorkArea_moc.cpp"