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
 254         // Enables input methods for asian languages.
 255         // Must be set when creating custom text editing widgets.
 256         setAttribute(Qt::WA_InputMethodEnabled, true);
 257 }
 258
 259
 260
 261 GuiWorkArea::~GuiWorkArea()
 262 {
 263         buffer_view_->buffer().workAreaManager().remove(this);
 264         delete buffer_view_;
 265 }
 266
 267
 268 void GuiWorkArea::close()
 269 {
 270         lyx_view_->removeWorkArea(this);
 271 }
 272
 273
 274 BufferView & GuiWorkArea::bufferView()
 275 {
 276         return *buffer_view_;
 277 }
 278
 279
 280 BufferView const & GuiWorkArea::bufferView() const
 281 {
 282         return *buffer_view_;
 283 }
 284
 285
 286 void GuiWorkArea::stopBlinkingCursor()
 287 {
 288         cursor_timeout_.stop();
 289         hideCursor();
 290 }
 291
 292
 293 void GuiWorkArea::startBlinkingCursor()
 294 {
 295         showCursor();
 296         cursor_timeout_.restart();
 297 }
 298
 299
 300 void GuiWorkArea::redraw()
 301 {
 302         if (!isVisible())
 303                 // No need to redraw in this case.
 304                 return;
 305
 306         // No need to do anything if this is the current view. The BufferView
 307         // metrics are already up to date.
 308         if (lyx_view_ != theApp()->currentView()) {
 309                 // FIXME: it would be nice to optimize for the off-screen case.
 310                 buffer_view_->updateMetrics();
 311                 buffer_view_->cursor().fixIfBroken();
 312         }
 313
 314         updateScrollbar();
 315
 316         // update cursor position, because otherwise it has to wait until
 317         // the blinking interval is over
 318         if (cursor_visible_) {
 319                 hideCursor();
 320                 showCursor();
 321         }
 322
 323         LYXERR(Debug::WORKAREA, "WorkArea::redraw screen");
 324         updateScreen();
 325         update(0, 0, viewport()->width(), viewport()->height());
 326
 327         if (lyxerr.debugging(Debug::WORKAREA))
 328                 buffer_view_->coordCache().dump();
 329 }
 330
 331
 332 void GuiWorkArea::processKeySym(KeySymbol const & key, KeyModifier mod)
 333 {
 334         // In order to avoid bad surprise in the middle of an operation,
 335         // we better stop the blinking cursor.
 336         stopBlinkingCursor();
 337
 338         theLyXFunc().setLyXView(lyx_view_);
 339         theLyXFunc().processKeySym(key, mod);
 340 }
 341
 342
 343 void GuiWorkArea::dispatch(FuncRequest const & cmd0, KeyModifier mod)
 344 {
 345         // Handle drag&drop
 346         if (cmd0.action == LFUN_FILE_OPEN) {
 347                 lyx_view_->dispatch(cmd0);
 348                 return;
 349         }
 350
 351         theLyXFunc().setLyXView(lyx_view_);
 352
 353         FuncRequest cmd;
 354
 355         if (cmd0.action == LFUN_MOUSE_PRESS) {
 356                 if (mod == ShiftModifier)
 357                         cmd = FuncRequest(cmd0, "region-select");
 358                 else if (mod == ControlModifier)
 359                         cmd = FuncRequest(cmd0, "paragraph-select");
 360                 else
 361                         cmd = cmd0;
 362         }
 363         else
 364                 cmd = cmd0;
 365
 366         // In order to avoid bad surprise in the middle of an operation, we better stop
 367         // the blinking cursor.
 368         if (!(cmd.action == LFUN_MOUSE_MOTION
 369                 && cmd.button() == mouse_button::none))
 370                 stopBlinkingCursor();
 371
 372         buffer_view_->mouseEventDispatch(cmd);
 373
 374         // Skip these when selecting
 375         if (cmd.action != LFUN_MOUSE_MOTION) {
 376                 lyx_view_->updateLayoutChoice(false);
 377                 lyx_view_->updateToolbars();
 378         }
 379
 380         // GUI tweaks except with mouse motion with no button pressed.
 381         if (!(cmd.action == LFUN_MOUSE_MOTION
 382                 && cmd.button() == mouse_button::none)) {
 383                 // Slight hack: this is only called currently when we
 384                 // clicked somewhere, so we force through the display
 385                 // of the new status here.
 386                 lyx_view_->clearMessage();
 387
 388                 // Show the cursor immediately after any operation.
 389                 startBlinkingCursor();
 390         }
 391 }
 392
 393
 394 void GuiWorkArea::resizeBufferView()
 395 {
 396         // WARNING: Please don't put any code that will trigger a repaint here!
 397         // We are already inside a paint event.
 398         lyx_view_->setBusy(true);
 399         buffer_view_->resize(viewport()->width(), viewport()->height());
 400         lyx_view_->updateLayoutChoice(false);
 401         lyx_view_->setBusy(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         if (verticalScrollBarPolicy() != Qt::ScrollBarAlwaysOn)
 476                 setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
 477         verticalScrollBar()->setTracking(false);
 478
 479         buffer_view_->updateScrollbar();
 480         ScrollbarParameters const & scroll_ = buffer_view_->scrollbarParameters();
 481
 482         // do what cursor movement does (some grey)
 483         int const h = scroll_.height + viewport()->height() / 4;
 484         int scroll_max_ = std::max(0, h - viewport()->height());
 485
 486         verticalScrollBar()->setRange(0, scroll_max_);
 487         verticalScrollBar()->setSliderPosition(scroll_.position);
 488         verticalScrollBar()->setSingleStep(scroll_.lineScrollHeight);
 489         verticalScrollBar()->setValue(scroll_.position);
 490
 491         verticalScrollBar()->setTracking(true);
 492 }
 493
 494
 495 void GuiWorkArea::adjustViewWithScrollBar(int action)
 496 {
 497         stopBlinkingCursor();
 498         if (action == QAbstractSlider::SliderPageStepAdd)
 499                 buffer_view_->scrollDown(viewport()->height());
 500         else if (action == QAbstractSlider::SliderPageStepSub)
 501                 buffer_view_->scrollUp(viewport()->height());
 502         else
 503                 buffer_view_->scrollDocView(verticalScrollBar()->sliderPosition());
 504
 505         if (lyxrc.cursor_follows_scrollbar) {
 506                 buffer_view_->setCursorFromScrollbar();
 507                 lyx_view_->updateLayoutChoice(false);
 508         }
 509         // Show the cursor immediately after any operation.
 510         startBlinkingCursor();
 511         QApplication::syncX();
 512 }
 513
 514
 515 void GuiWorkArea::focusInEvent(QFocusEvent * /*event*/)
 516 {
 517         // Repaint the whole screen.
 518         // Note: this is different from redraw() as only the backing pixmap
 519         // will be redrawn, which is cheap.
 520         viewport()->repaint();
 521
 522         startBlinkingCursor();
 523 }
 524
 525
 526 void GuiWorkArea::focusOutEvent(QFocusEvent * /*event*/)
 527 {
 528         stopBlinkingCursor();
 529 }
 530
 531
 532 void GuiWorkArea::mousePressEvent(QMouseEvent * e)
 533 {
 534         if (dc_event_.active && dc_event_ == *e) {
 535                 dc_event_.active = false;
 536                 FuncRequest cmd(LFUN_MOUSE_TRIPLE, e->x(), e->y(),
 537                         q_button_state(e->button()));
 538                 dispatch(cmd);
 539                 return;
 540         }
 541
 542         inputContext()->reset();
 543
 544         FuncRequest const cmd(LFUN_MOUSE_PRESS, e->x(), e->y(),
 545                 q_button_state(e->button()));
 546         dispatch(cmd, q_key_state(e->modifiers()));
 547 }
 548
 549
 550 void GuiWorkArea::mouseReleaseEvent(QMouseEvent * e)
 551 {
 552         if (synthetic_mouse_event_.timeout.running())
 553                 synthetic_mouse_event_.timeout.stop();
 554
 555         FuncRequest const cmd(LFUN_MOUSE_RELEASE, e->x(), e->y(),
 556                               q_button_state(e->button()));
 557         dispatch(cmd);
 558 }
 559
 560
 561 void GuiWorkArea::mouseMoveEvent(QMouseEvent * e)
 562 {
 563         // we kill the triple click if we move
 564         doubleClickTimeout();
 565         FuncRequest cmd(LFUN_MOUSE_MOTION, e->x(), e->y(),
 566                               q_motion_state(e->buttons()));
 567
 568         // If we're above or below the work area...
 569         if (e->y() <= 20 || e->y() >= viewport()->height() - 20) {
 570                 // Make sure only a synthetic event can cause a page scroll,
 571                 // so they come at a steady rate:
 572                 if (e->y() <= 20)
 573                         // _Force_ a scroll up:
 574                         cmd.y = -40;
 575                 else
 576                         cmd.y = viewport()->height();
 577                 // Store the event, to be handled when the timeout expires.
 578                 synthetic_mouse_event_.cmd = cmd;
 579
 580                 if (synthetic_mouse_event_.timeout.running())
 581                         // Discard the event. Note that it _may_ be handled
 582                         // when the timeout expires if
 583                         // synthetic_mouse_event_.cmd has not been overwritten.
 584                         // Ie, when the timeout expires, we handle the
 585                         // most recent event but discard all others that
 586                         // occurred after the one used to start the timeout
 587                         // in the first place.
 588                         return;
 589                 else {
 590                         synthetic_mouse_event_.restart_timeout = true;
 591                         synthetic_mouse_event_.timeout.start();
 592                         // Fall through to handle this event...
 593                 }
 594
 595         } else if (synthetic_mouse_event_.timeout.running()) {
 596                 // Store the event, to be possibly handled when the timeout
 597                 // expires.
 598                 // Once the timeout has expired, normal control is returned
 599                 // to mouseMoveEvent (restart_timeout = false).
 600                 // This results in a much smoother 'feel' when moving the
 601                 // mouse back into the work area.
 602                 synthetic_mouse_event_.cmd = cmd;
 603                 synthetic_mouse_event_.restart_timeout = false;
 604                 return;
 605         }
 606
 607         // Has anything changed on-screen since the last QMouseEvent
 608         // was received?
 609         double const scrollbar_value = verticalScrollBar()->value();
 610         if (e->x() != synthetic_mouse_event_.x_old ||
 611             e->y() != synthetic_mouse_event_.y_old ||
 612             scrollbar_value != synthetic_mouse_event_.scrollbar_value_old) {
 613                 // Yes it has. Store the params used to check this.
 614                 synthetic_mouse_event_.x_old = e->x();
 615                 synthetic_mouse_event_.y_old = e->y();
 616                 synthetic_mouse_event_.scrollbar_value_old = scrollbar_value;
 617
 618                 // ... and dispatch the event to the LyX core.
 619                 dispatch(cmd);
 620         }
 621 }
 622
 623
 624 void GuiWorkArea::wheelEvent(QWheelEvent * e)
 625 {
 626         // Wheel rotation by one notch results in a delta() of 120 (see
 627         // documentation of QWheelEvent)
 628         int const lines = qApp->wheelScrollLines() * e->delta() / 120;
 629         verticalScrollBar()->setValue(verticalScrollBar()->value() -
 630                         lines *  verticalScrollBar()->singleStep());
 631         adjustViewWithScrollBar();
 632 }
 633
 634
 635 void GuiWorkArea::generateSyntheticMouseEvent()
 636 {
 637 // Set things off to generate the _next_ 'pseudo' event.
 638         if (synthetic_mouse_event_.restart_timeout)
 639                 synthetic_mouse_event_.timeout.start();
 640
 641         // Has anything changed on-screen since the last timeout signal
 642         // was received?
 643         double const scrollbar_value = verticalScrollBar()->value();
 644         if (scrollbar_value != synthetic_mouse_event_.scrollbar_value_old) {
 645                 // Yes it has. Store the params used to check this.
 646                 synthetic_mouse_event_.scrollbar_value_old = scrollbar_value;
 647
 648                 // ... and dispatch the event to the LyX core.
 649                 dispatch(synthetic_mouse_event_.cmd);
 650         }
 651 }
 652
 653
 654 void GuiWorkArea::keyPressEvent(QKeyEvent * ev)
 655 {
 656         // do nothing if there are other events
 657         // (the auto repeated events come too fast)
 658         // \todo FIXME: remove hard coded Qt keys, process the key binding
 659 #ifdef Q_WS_X11
 660         if (XEventsQueued(QX11Info::display(), 0) > 1 && ev->isAutoRepeat()
 661                         && (Qt::Key_PageDown || Qt::Key_PageUp)) {
 662                 LYXERR(Debug::KEY, BOOST_CURRENT_FUNCTION
 663                         << "\nsystem is busy: scroll key event ignored");
 664                 ev->ignore();
 665                 return;
 666         }
 667 #endif
 668
 669         LYXERR(Debug::KEY, BOOST_CURRENT_FUNCTION
 670                 << " count=" << ev->count()
 671                 << " text=" << fromqstr(ev->text())
 672                 << " isAutoRepeat=" << ev->isAutoRepeat()
 673                 << " key=" << ev->key());
 674
 675         KeySymbol sym;
 676         setKeySymbol(&sym, ev);
 677         processKeySym(sym, q_key_state(ev->modifiers()));
 678 }
 679
 680
 681 void GuiWorkArea::doubleClickTimeout()
 682 {
 683         dc_event_.active = false;
 684 }
 685
 686
 687 void GuiWorkArea::mouseDoubleClickEvent(QMouseEvent * ev)
 688 {
 689         dc_event_ = DoubleClick(ev);
 690         QTimer::singleShot(QApplication::doubleClickInterval(), this,
 691                            SLOT(doubleClickTimeout()));
 692         FuncRequest cmd(LFUN_MOUSE_DOUBLE,
 693                         ev->x(), ev->y(),
 694                         q_button_state(ev->button()));
 695         dispatch(cmd);
 696 }
 697
 698
 699 void GuiWorkArea::resizeEvent(QResizeEvent * ev)
 700 {
 701         QAbstractScrollArea::resizeEvent(ev);
 702         need_resize_ = true;
 703 }
 704
 705
 706 void GuiWorkArea::update(int x, int y, int w, int h)
 707 {
 708         viewport()->repaint(x, y, w, h);
 709 }
 710
 711
 712 void GuiWorkArea::paintEvent(QPaintEvent * ev)
 713 {
 714         QRect const rc = ev->rect();
 715         /*
 716         LYXERR(Debug::PAINTING) << "paintEvent begin: x: " << rc.x()
 717                 << " y: " << rc.y()
 718                 << " w: " << rc.width()
 719                 << " h: " << rc.height() << endl;
 720         */
 721
 722         if (need_resize_) {
 723                 verticalScrollBar()->setPageStep(viewport()->height());
 724                 screen_ = QPixmap(viewport()->width(), viewport()->height());
 725                 resizeBufferView();
 726                 updateScreen();
 727                 hideCursor();
 728                 showCursor();
 729                 need_resize_ = false;
 730         }
 731
 732         QPainter pain(viewport());
 733         pain.drawPixmap(rc, screen_, rc);
 734         cursor_->draw(pain);
 735 }
 736
 737
 738 void GuiWorkArea::updateScreen()
 739 {
 740         GuiPainter pain(&screen_);
 741         verticalScrollBar()->show();
 742         buffer_view_->draw(pain);
 743 }
 744
 745
 746 void GuiWorkArea::showCursor(int x, int y, int h, CursorShape shape)
 747 {
 748         if (schedule_redraw_) {
 749                 buffer_view_->updateMetrics();
 750                 updateScreen();
 751                 viewport()->update(QRect(0, 0, viewport()->width(), viewport()->height()));
 752                 schedule_redraw_ = false;
 753                 // Show the cursor immediately after the update.
 754                 hideCursor();
 755                 toggleCursor();
 756                 return;
 757         }
 758
 759         cursor_->update(x, y, h, shape);
 760         cursor_->show();
 761         viewport()->update(cursor_->rect());
 762 }
 763
 764
 765 void GuiWorkArea::removeCursor()
 766 {
 767         cursor_->hide();
 768         //if (!qApp->focusWidget())
 769                 viewport()->update(cursor_->rect());
 770 }
 771
 772
 773 void GuiWorkArea::inputMethodEvent(QInputMethodEvent * e)
 774 {
 775         QString const & commit_string = e->commitString();
 776         docstring const & preedit_string
 777                 = qstring_to_ucs4(e->preeditString());
 778
 779         if (!commit_string.isEmpty()) {
 780
 781                 LYXERR(Debug::KEY, BOOST_CURRENT_FUNCTION
 782                         << " preeditString =" << fromqstr(e->preeditString())
 783                         << " commitString  =" << fromqstr(e->commitString()));
 784
 785                 int key = 0;
 786
 787                 // FIXME Iwami 04/01/07: we should take care also of UTF16 surrogates here.
 788                 for (int i = 0; i < commit_string.size(); ++i) {
 789                         QKeyEvent ev(QEvent::KeyPress, key, Qt::NoModifier, commit_string[i]);
 790                         keyPressEvent(&ev);
 791                 }
 792         }
 793
 794         // Hide the cursor during the kana-kanji transformation.
 795         if (preedit_string.empty())
 796                 startBlinkingCursor();
 797         else
 798                 stopBlinkingCursor();
 799
 800         // last_width : for checking if last preedit string was/wasn't empty.
 801         static bool last_width = false;
 802         if (!last_width && preedit_string.empty()) {
 803                 // if last_width is last length of preedit string.
 804                 e->accept();
 805                 return;
 806         }
 807
 808         GuiPainter pain(&screen_);
 809         buffer_view_->updateMetrics();
 810         buffer_view_->draw(pain);
 811         FontInfo font = buffer_view_->cursor().getFont().fontInfo();
 812         FontMetrics const & fm = theFontMetrics(font);
 813         int height = fm.maxHeight();
 814         int cur_x = cursor_->rect().left();
 815         int cur_y = cursor_->rect().bottom();
 816
 817         // redraw area of preedit string.
 818         update(0, cur_y - height, viewport()->width(),
 819                 (height + 1) * preedit_lines_);
 820
 821         if (preedit_string.empty()) {
 822                 last_width = false;
 823                 preedit_lines_ = 1;
 824                 e->accept();
 825                 return;
 826         }
 827         last_width = true;
 828
 829         // att : stores an IM attribute.
 830         QList<QInputMethodEvent::Attribute> const & att = e->attributes();
 831
 832         // get attributes of input method cursor.
 833         // cursor_pos : cursor position in preedit string.
 834         size_t cursor_pos = 0;
 835         bool cursor_is_visible = false;
 836         for (int i = 0; i < att.size(); ++i) {
 837                 if (att.at(i).type == QInputMethodEvent::Cursor) {
 838                         cursor_pos = att.at(i).start;
 839                         cursor_is_visible = att.at(i).length != 0;
 840                         break;
 841                 }
 842         }
 843
 844         size_t preedit_length = preedit_string.length();
 845
 846         // get position of selection in input method.
 847         // FIXME: isn't there a way to do this simplier?
 848         // rStart : cursor position in selected string in IM.
 849         size_t rStart = 0;
 850         // rLength : selected string length in IM.
 851         size_t rLength = 0;
 852         if (cursor_pos < preedit_length) {
 853                 for (int i = 0; i < att.size(); ++i) {
 854                         if (att.at(i).type == QInputMethodEvent::TextFormat) {
 855                                 if (att.at(i).start <= int(cursor_pos)
 856                                         && int(cursor_pos) < att.at(i).start + att.at(i).length) {
 857                                                 rStart = att.at(i).start;
 858                                                 rLength = att.at(i).length;
 859                                                 if (!cursor_is_visible)
 860                                                         cursor_pos += rLength;
 861                                                 break;
 862                                 }
 863                         }
 864                 }
 865         }
 866         else {
 867                 rStart = cursor_pos;
 868                 rLength = 0;
 869         }
 870
 871         int const right_margin = rightMargin();
 872         Painter::preedit_style ps;
 873         // Most often there would be only one line:
 874         preedit_lines_ = 1;
 875         for (size_t pos = 0; pos != preedit_length; ++pos) {
 876                 char_type const typed_char = preedit_string[pos];
 877                 // reset preedit string style
 878                 ps = Painter::preedit_default;
 879
 880                 // if we reached the right extremity of the screen, go to next line.
 881                 if (cur_x + fm.width(typed_char) > viewport()->width() - right_margin) {
 882                         cur_x = right_margin;
 883                         cur_y += height + 1;
 884                         ++preedit_lines_;
 885                 }
 886                 // preedit strings are displayed with dashed underline
 887                 // and partial strings are displayed white on black indicating
 888                 // that we are in selecting mode in the input method.
 889                 // FIXME: rLength == preedit_length is not a changing condition
 890                 // FIXME: should be put out of the loop.
 891                 if (pos >= rStart
 892                         && pos < rStart + rLength
 893                         && !(cursor_pos < rLength && rLength == preedit_length))
 894                         ps = Painter::preedit_selecting;
 895
 896                 if (pos == cursor_pos
 897                         && (cursor_pos < rLength && rLength == preedit_length))
 898                         ps = Painter::preedit_cursor;
 899
 900                 // draw one character and update cur_x.
 901                 cur_x += pain.preeditText(cur_x, cur_y, typed_char, font, ps);
 902         }
 903
 904         // update the preedit string screen area.
 905         update(0, cur_y - preedit_lines_*height, viewport()->width(),
 906                 (height + 1) * preedit_lines_);
 907
 908         // Don't forget to accept the event!
 909         e->accept();
 910 }
 911
 912
 913 QVariant GuiWorkArea::inputMethodQuery(Qt::InputMethodQuery query) const
 914 {
 915         QRect cur_r(0,0,0,0);
 916         switch (query) {
 917                 // this is the CJK-specific composition window position.
 918                 case Qt::ImMicroFocus:
 919                         cur_r = cursor_->rect();
 920                         if (preedit_lines_ != 1)
 921                                 cur_r.moveLeft(10);
 922                         cur_r.moveBottom(cur_r.bottom() + cur_r.height() * preedit_lines_);
 923                         // return lower right of cursor in LyX.
 924                         return cur_r;
 925                 default:
 926                         return QWidget::inputMethodQuery(query);
 927         }
 928 }
 929
 930
 931 void GuiWorkArea::updateWindowTitle()
 932 {
 933         docstring maximize_title;
 934         docstring minimize_title;
 935
 936         Buffer & buf = buffer_view_->buffer();
 937         FileName const fileName = buf.fileName();
 938         if (!fileName.empty()) {
 939                 maximize_title = fileName.displayName(30);
 940                 minimize_title = from_utf8(fileName.onlyFileName());
 941                 if (!buf.isClean()) {
 942                         maximize_title += _(" (changed)");
 943                         minimize_title += char_type('*');
 944                 }
 945                 if (buf.isReadonly())
 946                         maximize_title += _(" (read only)");
 947         }
 948
 949         QString title = windowTitle();
 950         QString new_title = toqstr(maximize_title);
 951         if (title == new_title)
 952                 return;
 953
 954         QWidget::setWindowTitle(new_title);
 955         QWidget::setWindowIconText(toqstr(minimize_title));
 956         titleChanged(this);
 957 }
 958
 959
 960 void GuiWorkArea::setReadOnly(bool)
 961 {
 962         updateWindowTitle();
 963         if (this == lyx_view_->currentWorkArea())
 964                 lyx_view_->getDialogs().updateBufferDependent(false);
 965 }
 966
 967
 968 ////////////////////////////////////////////////////////////////////
 969 //
 970 // TabWorkArea
 971 //
 972 ////////////////////////////////////////////////////////////////////
 973
 974 TabWorkArea::TabWorkArea(QWidget * parent) : QTabWidget(parent)
 975 {
 976         QPalette pal = palette();
 977         pal.setColor(QPalette::Active, QPalette::Button,
 978                 pal.color(QPalette::Active, QPalette::Window));
 979         pal.setColor(QPalette::Disabled, QPalette::Button,
 980                 pal.color(QPalette::Disabled, QPalette::Window));
 981         pal.setColor(QPalette::Inactive, QPalette::Button,
 982                 pal.color(QPalette::Inactive, QPalette::Window));
 983
 984         QToolButton * closeTabButton = new QToolButton(this);
 985     closeTabButton->setPalette(pal);
 986         closeTabButton->setIcon(QIcon(":/images/closetab.png"));
 987         closeTabButton->setText("Close");
 988         closeTabButton->setAutoRaise(true);
 989         closeTabButton->setCursor(Qt::ArrowCursor);
 990         closeTabButton->setToolTip(tr("Close tab"));
 991         closeTabButton->setEnabled(true);
 992
 993         QObject::connect(this, SIGNAL(currentChanged(int)),
 994                 this, SLOT(on_currentTabChanged(int)));
 995         QObject::connect(closeTabButton, SIGNAL(clicked()),
 996                 this, SLOT(closeCurrentTab()));
 997
 998         setCornerWidget(closeTabButton);
 999         setUsesScrollButtons(true);
1000 }
1001
1002
1003 void TabWorkArea::showBar(bool show)
1004 {
1005         tabBar()->setVisible(show);
1006 }
1007
1008
1009 GuiWorkArea * TabWorkArea::currentWorkArea()
1010 {
1011         if (count() == 0)
1012                 return 0;
1013
1014         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(currentWidget());
1015         BOOST_ASSERT(wa);
1016         return wa;
1017 }
1018
1019
1020 GuiWorkArea * TabWorkArea::workArea(Buffer & buffer)
1021 {
1022         for (int i = 0; i != count(); ++i) {
1023                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i));
1024                 BOOST_ASSERT(wa);
1025                 if (&wa->bufferView().buffer() == &buffer)
1026                         return wa;
1027         }
1028         return 0;
1029 }
1030
1031
1032 void TabWorkArea::closeAll()
1033 {
1034         while (count()) {
1035                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(0));
1036                 BOOST_ASSERT(wa);
1037                 removeTab(0);
1038                 delete wa;
1039         }
1040 }
1041
1042
1043 bool TabWorkArea::setCurrentWorkArea(GuiWorkArea * work_area)
1044 {
1045         BOOST_ASSERT(work_area);
1046         int index = indexOf(work_area);
1047         if (index == -1)
1048                 return false;
1049
1050         if (index == currentIndex())
1051                 // Make sure the work area is up to date.
1052                 on_currentTabChanged(index);
1053         else
1054                 // Switch to the work area.
1055                 setCurrentIndex(index);
1056         work_area->setFocus();
1057
1058         return true;
1059 }
1060
1061
1062 bool TabWorkArea::removeWorkArea(GuiWorkArea * work_area)
1063 {
1064         BOOST_ASSERT(work_area);
1065         int index = indexOf(work_area);
1066         if (index == -1)
1067                 return false;
1068
1069         work_area->setUpdatesEnabled(false);
1070         removeTab(index);
1071         delete work_area;
1072
1073         if (count()) {
1074                 // make sure the next work area is enabled.
1075                 currentWidget()->setUpdatesEnabled(true);
1076                 // Hide tabbar if there's only one tab.
1077                 showBar(count() > 1);
1078         }
1079         return true;
1080 }
1081
1082
1083 void TabWorkArea::on_currentTabChanged(int i)
1084 {
1085         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i));
1086         BOOST_ASSERT(wa);
1087         BufferView & bv = wa->bufferView();
1088         bv.updateMetrics();
1089         bv.cursor().fixIfBroken();
1090         wa->setUpdatesEnabled(true);
1091         wa->redraw();
1092         wa->setFocus();
1093         ///
1094         currentWorkAreaChanged(wa);
1095
1096         LYXERR(Debug::GUI, "currentTabChanged " << i
1097                 << "File" << bv.buffer().absFileName());
1098 }
1099
1100
1101 void TabWorkArea::closeCurrentTab()
1102 {
1103         lyx::dispatch(FuncRequest(LFUN_BUFFER_CLOSE));
1104 }
1105
1106
1107 void TabWorkArea::updateTabText(GuiWorkArea * wa)
1108 {
1109         int const i = indexOf(wa);
1110         if (i < 0)
1111                 return;
1112         setTabText(i, wa->windowTitle());
1113 }
1114
1115 } // namespace frontend
1116 } // namespace lyx
1117
1118 #include "GuiWorkArea_moc.cpp"