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         lyx_view_->updateStatusBar();
 327
 328         if (lyxerr.debugging(Debug::WORKAREA))
 329                 buffer_view_->coordCache().dump();
 330 }
 331
 332
 333 void GuiWorkArea::processKeySym(KeySymbol const & key, KeyModifier mod)
 334 {
 335         // In order to avoid bad surprise in the middle of an operation,
 336         // we better stop the blinking cursor.
 337         stopBlinkingCursor();
 338
 339         theLyXFunc().setLyXView(lyx_view_);
 340         theLyXFunc().processKeySym(key, mod);
 341 }
 342
 343
 344 void GuiWorkArea::dispatch(FuncRequest const & cmd0, KeyModifier mod)
 345 {
 346         // Handle drag&drop
 347         if (cmd0.action == LFUN_FILE_OPEN) {
 348                 lyx_view_->dispatch(cmd0);
 349                 return;
 350         }
 351
 352         theLyXFunc().setLyXView(lyx_view_);
 353
 354         FuncRequest cmd;
 355
 356         if (cmd0.action == LFUN_MOUSE_PRESS) {
 357                 if (mod == ShiftModifier)
 358                         cmd = FuncRequest(cmd0, "region-select");
 359                 else if (mod == ControlModifier)
 360                         cmd = FuncRequest(cmd0, "paragraph-select");
 361                 else
 362                         cmd = cmd0;
 363         }
 364         else
 365                 cmd = cmd0;
 366
 367         // In order to avoid bad surprise in the middle of an operation, we better stop
 368         // the blinking cursor.
 369         if (!(cmd.action == LFUN_MOUSE_MOTION
 370                 && cmd.button() == mouse_button::none))
 371                 stopBlinkingCursor();
 372
 373         buffer_view_->mouseEventDispatch(cmd);
 374
 375         // Skip these when selecting
 376         if (cmd.action != LFUN_MOUSE_MOTION) {
 377                 lyx_view_->updateLayoutList();
 378                 lyx_view_->updateToolbars();
 379         }
 380
 381         // GUI tweaks except with mouse motion with no button pressed.
 382         if (!(cmd.action == LFUN_MOUSE_MOTION
 383                 && cmd.button() == mouse_button::none)) {
 384                 // Slight hack: this is only called currently when we
 385                 // clicked somewhere, so we force through the display
 386                 // of the new status here.
 387                 lyx_view_->clearMessage();
 388
 389                 // Show the cursor immediately after any operation.
 390                 startBlinkingCursor();
 391         }
 392 }
 393
 394
 395 void GuiWorkArea::resizeBufferView()
 396 {
 397         // WARNING: Please don't put any code that will trigger a repaint here!
 398         // We are already inside a paint event.
 399         lyx_view_->setBusy(true);
 400         buffer_view_->resize(viewport()->width(), viewport()->height());
 401         lyx_view_->updateLayoutList();
 402         lyx_view_->setBusy(false);
 403         need_resize_ = false;
 404 }
 405
 406
 407 void GuiWorkArea::showCursor()
 408 {
 409         if (cursor_visible_)
 410                 return;
 411
 412         CursorShape shape = BAR_SHAPE;
 413
 414         Font const & realfont = buffer_view_->cursor().real_current_font;
 415         BufferParams const & bp = buffer_view_->buffer().params();
 416         bool const samelang = realfont.language() == bp.language;
 417         bool const isrtl = realfont.isVisibleRightToLeft();
 418
 419         if (!samelang || isrtl != bp.language->rightToLeft()) {
 420                 shape = L_SHAPE;
 421                 if (isrtl)
 422                         shape = REVERSED_L_SHAPE;
 423         }
 424
 425         // The ERT language hack needs fixing up
 426         if (realfont.language() == latex_language)
 427                 shape = BAR_SHAPE;
 428
 429         Font const font = buffer_view_->cursor().getFont();
 430         FontMetrics const & fm = theFontMetrics(font);
 431         int const asc = fm.maxAscent();
 432         int const des = fm.maxDescent();
 433         int h = asc + des;
 434         int x = 0;
 435         int y = 0;
 436         buffer_view_->cursor().getPos(x, y);
 437         y -= asc;
 438
 439         // if it doesn't touch the screen, don't try to show it
 440         if (y + h < 0 || y >= viewport()->height())
 441                 return;
 442
 443         cursor_visible_ = true;
 444         showCursor(x, y, h, shape);
 445 }
 446
 447
 448 void GuiWorkArea::hideCursor()
 449 {
 450         if (!cursor_visible_)
 451                 return;
 452
 453         cursor_visible_ = false;
 454         removeCursor();
 455 }
 456
 457
 458 void GuiWorkArea::toggleCursor()
 459 {
 460         if (cursor_visible_)
 461                 hideCursor();
 462         else
 463                 showCursor();
 464
 465         // Use this opportunity to deal with any child processes that
 466         // have finished but are waiting to communicate this fact
 467         // to the rest of LyX.
 468         ForkedcallsController & fcc = ForkedcallsController::get();
 469         fcc.handleCompletedProcesses();
 470
 471         cursor_timeout_.restart();
 472 }
 473
 474
 475 void GuiWorkArea::updateScrollbar()
 476 {
 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_->updateLayoutList();
 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         }
 730
 731         QPainter pain(viewport());
 732         pain.drawPixmap(rc, screen_, rc);
 733         cursor_->draw(pain);
 734 }
 735
 736
 737 void GuiWorkArea::updateScreen()
 738 {
 739         GuiPainter pain(&screen_);
 740         buffer_view_->draw(pain);
 741 }
 742
 743
 744 void GuiWorkArea::showCursor(int x, int y, int h, CursorShape shape)
 745 {
 746         if (schedule_redraw_) {
 747                 buffer_view_->updateMetrics();
 748                 updateScreen();
 749                 viewport()->update(QRect(0, 0, viewport()->width(), viewport()->height()));
 750                 schedule_redraw_ = false;
 751                 // Show the cursor immediately after the update.
 752                 hideCursor();
 753                 toggleCursor();
 754                 return;
 755         }
 756
 757         cursor_->update(x, y, h, shape);
 758         cursor_->show();
 759         viewport()->update(cursor_->rect());
 760 }
 761
 762
 763 void GuiWorkArea::removeCursor()
 764 {
 765         cursor_->hide();
 766         //if (!qApp->focusWidget())
 767                 viewport()->update(cursor_->rect());
 768 }
 769
 770
 771 void GuiWorkArea::inputMethodEvent(QInputMethodEvent * e)
 772 {
 773         QString const & commit_string = e->commitString();
 774         docstring const & preedit_string
 775                 = qstring_to_ucs4(e->preeditString());
 776
 777         if (!commit_string.isEmpty()) {
 778
 779                 LYXERR(Debug::KEY, BOOST_CURRENT_FUNCTION
 780                         << " preeditString =" << fromqstr(e->preeditString())
 781                         << " commitString  =" << fromqstr(e->commitString()));
 782
 783                 int key = 0;
 784
 785                 // FIXME Iwami 04/01/07: we should take care also of UTF16 surrogates here.
 786                 for (int i = 0; i < commit_string.size(); ++i) {
 787                         QKeyEvent ev(QEvent::KeyPress, key, Qt::NoModifier, commit_string[i]);
 788                         keyPressEvent(&ev);
 789                 }
 790         }
 791
 792         // Hide the cursor during the kana-kanji transformation.
 793         if (preedit_string.empty())
 794                 startBlinkingCursor();
 795         else
 796                 stopBlinkingCursor();
 797
 798         // last_width : for checking if last preedit string was/wasn't empty.
 799         static bool last_width = false;
 800         if (!last_width && preedit_string.empty()) {
 801                 // if last_width is last length of preedit string.
 802                 e->accept();
 803                 return;
 804         }
 805
 806         GuiPainter pain(&screen_);
 807         buffer_view_->updateMetrics();
 808         buffer_view_->draw(pain);
 809         FontInfo font = buffer_view_->cursor().getFont().fontInfo();
 810         FontMetrics const & fm = theFontMetrics(font);
 811         int height = fm.maxHeight();
 812         int cur_x = cursor_->rect().left();
 813         int cur_y = cursor_->rect().bottom();
 814
 815         // redraw area of preedit string.
 816         update(0, cur_y - height, viewport()->width(),
 817                 (height + 1) * preedit_lines_);
 818
 819         if (preedit_string.empty()) {
 820                 last_width = false;
 821                 preedit_lines_ = 1;
 822                 e->accept();
 823                 return;
 824         }
 825         last_width = true;
 826
 827         // att : stores an IM attribute.
 828         QList<QInputMethodEvent::Attribute> const & att = e->attributes();
 829
 830         // get attributes of input method cursor.
 831         // cursor_pos : cursor position in preedit string.
 832         size_t cursor_pos = 0;
 833         bool cursor_is_visible = false;
 834         for (int i = 0; i < att.size(); ++i) {
 835                 if (att.at(i).type == QInputMethodEvent::Cursor) {
 836                         cursor_pos = att.at(i).start;
 837                         cursor_is_visible = att.at(i).length != 0;
 838                         break;
 839                 }
 840         }
 841
 842         size_t preedit_length = preedit_string.length();
 843
 844         // get position of selection in input method.
 845         // FIXME: isn't there a way to do this simplier?
 846         // rStart : cursor position in selected string in IM.
 847         size_t rStart = 0;
 848         // rLength : selected string length in IM.
 849         size_t rLength = 0;
 850         if (cursor_pos < preedit_length) {
 851                 for (int i = 0; i < att.size(); ++i) {
 852                         if (att.at(i).type == QInputMethodEvent::TextFormat) {
 853                                 if (att.at(i).start <= int(cursor_pos)
 854                                         && int(cursor_pos) < att.at(i).start + att.at(i).length) {
 855                                                 rStart = att.at(i).start;
 856                                                 rLength = att.at(i).length;
 857                                                 if (!cursor_is_visible)
 858                                                         cursor_pos += rLength;
 859                                                 break;
 860                                 }
 861                         }
 862                 }
 863         }
 864         else {
 865                 rStart = cursor_pos;
 866                 rLength = 0;
 867         }
 868
 869         int const right_margin = rightMargin();
 870         Painter::preedit_style ps;
 871         // Most often there would be only one line:
 872         preedit_lines_ = 1;
 873         for (size_t pos = 0; pos != preedit_length; ++pos) {
 874                 char_type const typed_char = preedit_string[pos];
 875                 // reset preedit string style
 876                 ps = Painter::preedit_default;
 877
 878                 // if we reached the right extremity of the screen, go to next line.
 879                 if (cur_x + fm.width(typed_char) > viewport()->width() - right_margin) {
 880                         cur_x = right_margin;
 881                         cur_y += height + 1;
 882                         ++preedit_lines_;
 883                 }
 884                 // preedit strings are displayed with dashed underline
 885                 // and partial strings are displayed white on black indicating
 886                 // that we are in selecting mode in the input method.
 887                 // FIXME: rLength == preedit_length is not a changing condition
 888                 // FIXME: should be put out of the loop.
 889                 if (pos >= rStart
 890                         && pos < rStart + rLength
 891                         && !(cursor_pos < rLength && rLength == preedit_length))
 892                         ps = Painter::preedit_selecting;
 893
 894                 if (pos == cursor_pos
 895                         && (cursor_pos < rLength && rLength == preedit_length))
 896                         ps = Painter::preedit_cursor;
 897
 898                 // draw one character and update cur_x.
 899                 cur_x += pain.preeditText(cur_x, cur_y, typed_char, font, ps);
 900         }
 901
 902         // update the preedit string screen area.
 903         update(0, cur_y - preedit_lines_*height, viewport()->width(),
 904                 (height + 1) * preedit_lines_);
 905
 906         // Don't forget to accept the event!
 907         e->accept();
 908 }
 909
 910
 911 QVariant GuiWorkArea::inputMethodQuery(Qt::InputMethodQuery query) const
 912 {
 913         QRect cur_r(0,0,0,0);
 914         switch (query) {
 915                 // this is the CJK-specific composition window position.
 916                 case Qt::ImMicroFocus:
 917                         cur_r = cursor_->rect();
 918                         if (preedit_lines_ != 1)
 919                                 cur_r.moveLeft(10);
 920                         cur_r.moveBottom(cur_r.bottom() + cur_r.height() * preedit_lines_);
 921                         // return lower right of cursor in LyX.
 922                         return cur_r;
 923                 default:
 924                         return QWidget::inputMethodQuery(query);
 925         }
 926 }
 927
 928
 929 void GuiWorkArea::updateWindowTitle()
 930 {
 931         docstring maximize_title;
 932         docstring minimize_title;
 933
 934         Buffer & buf = buffer_view_->buffer();
 935         FileName const fileName = buf.fileName();
 936         if (!fileName.empty()) {
 937                 maximize_title = fileName.displayName(30);
 938                 minimize_title = from_utf8(fileName.onlyFileName());
 939                 if (!buf.isClean()) {
 940                         maximize_title += _(" (changed)");
 941                         minimize_title += char_type('*');
 942                 }
 943                 if (buf.isReadonly())
 944                         maximize_title += _(" (read only)");
 945         }
 946
 947         QString title = windowTitle();
 948         QString new_title = toqstr(maximize_title);
 949         if (title == new_title)
 950                 return;
 951
 952         QWidget::setWindowTitle(new_title);
 953         QWidget::setWindowIconText(toqstr(minimize_title));
 954         titleChanged(this);
 955 }
 956
 957
 958 void GuiWorkArea::setReadOnly(bool)
 959 {
 960         updateWindowTitle();
 961         if (this == lyx_view_->currentWorkArea())
 962                 lyx_view_->updateBufferDependent(false);
 963 }
 964
 965
 966 ////////////////////////////////////////////////////////////////////
 967 //
 968 // TabWorkArea
 969 //
 970 ////////////////////////////////////////////////////////////////////
 971
 972 TabWorkArea::TabWorkArea(QWidget * parent) : QTabWidget(parent)
 973 {
 974         QPalette pal = palette();
 975         pal.setColor(QPalette::Active, QPalette::Button,
 976                 pal.color(QPalette::Active, QPalette::Window));
 977         pal.setColor(QPalette::Disabled, QPalette::Button,
 978                 pal.color(QPalette::Disabled, QPalette::Window));
 979         pal.setColor(QPalette::Inactive, QPalette::Button,
 980                 pal.color(QPalette::Inactive, QPalette::Window));
 981
 982         QToolButton * closeTabButton = new QToolButton(this);
 983     closeTabButton->setPalette(pal);
 984         closeTabButton->setIcon(QIcon(":/images/closetab.png"));
 985         closeTabButton->setText("Close");
 986         closeTabButton->setAutoRaise(true);
 987         closeTabButton->setCursor(Qt::ArrowCursor);
 988         closeTabButton->setToolTip(tr("Close tab"));
 989         closeTabButton->setEnabled(true);
 990
 991         QObject::connect(this, SIGNAL(currentChanged(int)),
 992                 this, SLOT(on_currentTabChanged(int)));
 993         QObject::connect(closeTabButton, SIGNAL(clicked()),
 994                 this, SLOT(closeCurrentTab()));
 995
 996         setCornerWidget(closeTabButton);
 997         setUsesScrollButtons(true);
 998 }
 999
1000
1001 void TabWorkArea::showBar(bool show)
1002 {
1003         tabBar()->setEnabled(show);
1004         tabBar()->setVisible(show);
1005 }
1006
1007
1008 GuiWorkArea * TabWorkArea::currentWorkArea()
1009 {
1010         if (count() == 0)
1011                 return 0;
1012
1013         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(currentWidget());
1014         BOOST_ASSERT(wa);
1015         return wa;
1016 }
1017
1018
1019 GuiWorkArea * TabWorkArea::workArea(Buffer & buffer)
1020 {
1021         for (int i = 0; i != count(); ++i) {
1022                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i));
1023                 BOOST_ASSERT(wa);
1024                 if (&wa->bufferView().buffer() == &buffer)
1025                         return wa;
1026         }
1027         return 0;
1028 }
1029
1030
1031 void TabWorkArea::closeAll()
1032 {
1033         while (count()) {
1034                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(0));
1035                 BOOST_ASSERT(wa);
1036                 removeTab(0);
1037                 delete wa;
1038         }
1039 }
1040
1041
1042 bool TabWorkArea::setCurrentWorkArea(GuiWorkArea * work_area)
1043 {
1044         BOOST_ASSERT(work_area);
1045         int index = indexOf(work_area);
1046         if (index == -1)
1047                 return false;
1048
1049         if (index == currentIndex())
1050                 // Make sure the work area is up to date.
1051                 on_currentTabChanged(index);
1052         else
1053                 // Switch to the work area.
1054                 setCurrentIndex(index);
1055         work_area->setFocus();
1056
1057         return true;
1058 }
1059
1060
1061 GuiWorkArea * TabWorkArea::addWorkArea(Buffer & buffer, GuiView & view)
1062 {
1063         GuiWorkArea * wa = new GuiWorkArea(buffer, view);
1064         wa->setUpdatesEnabled(false);
1065         // Hide tabbar if there's no tab (avoid a resize and a flashing tabbar
1066         // when hiding it again below).
1067         showBar(count() > 0);
1068         addTab(wa, wa->windowTitle());
1069         QObject::connect(wa, SIGNAL(titleChanged(GuiWorkArea *)),
1070                 this, SLOT(updateTabText(GuiWorkArea *)));
1071         // Hide tabbar if there's only one tab.
1072         showBar(count() > 1);
1073         return wa;
1074 }
1075
1076
1077 bool TabWorkArea::removeWorkArea(GuiWorkArea * work_area)
1078 {
1079         BOOST_ASSERT(work_area);
1080         int index = indexOf(work_area);
1081         if (index == -1)
1082                 return false;
1083
1084         work_area->setUpdatesEnabled(false);
1085         removeTab(index);
1086         delete work_area;
1087
1088         if (count()) {
1089                 // make sure the next work area is enabled.
1090                 currentWidget()->setUpdatesEnabled(true);
1091                 // Hide tabbar if there's only one tab.
1092                 showBar(count() > 1);
1093         }
1094         return true;
1095 }
1096
1097
1098 void TabWorkArea::on_currentTabChanged(int i)
1099 {
1100         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i));
1101         BOOST_ASSERT(wa);
1102         BufferView & bv = wa->bufferView();
1103         bv.cursor().fixIfBroken();
1104         bv.updateMetrics();
1105         wa->setUpdatesEnabled(true);
1106         wa->redraw();
1107         wa->setFocus();
1108         ///
1109         currentWorkAreaChanged(wa);
1110
1111         LYXERR(Debug::GUI, "currentTabChanged " << i
1112                 << "File" << bv.buffer().absFileName());
1113 }
1114
1115
1116 void TabWorkArea::closeCurrentTab()
1117 {
1118         lyx::dispatch(FuncRequest(LFUN_BUFFER_CLOSE));
1119 }
1120
1121
1122 void TabWorkArea::updateTabText(GuiWorkArea * wa)
1123 {
1124         int const i = indexOf(wa);
1125         if (i < 0)
1126                 return;
1127         setTabText(i, wa->windowTitle());
1128 }
1129
1130 } // namespace frontend
1131 } // namespace lyx
1132
1133 #include "GuiWorkArea_moc.cpp"