src/frontends/qt4/GuiWorkArea.cpp

   1 /**
   2  * \file GuiWorkArea.cpp
   3  * This file is part of LyX, the document processor.
   4  * Licence details can be found in the file COPYING.
   5  *
   6  * \author John Levon
   7  * \author Abdelrazak Younes
   8  *
   9  * Full author contact details are available in file CREDITS.
  10  */
  11
  12 #include <config.h>
  13
  14 #include "GuiWorkArea.h"
  15
  16 #include "Buffer.h"
  17 #include "BufferParams.h"
  18 #include "BufferView.h"
  19 #include "CoordCache.h"
  20 #include "Cursor.h"
  21 #include "Font.h"
  22 #include "FuncRequest.h"
  23 #include "GuiApplication.h"
  24 #include "GuiKeySymbol.h"
  25 #include "GuiPainter.h"
  26 #include "GuiPopupMenu.h"
  27 #include "GuiView.h"
  28 #include "KeySymbol.h"
  29 #include "Language.h"
  30 #include "LyXFunc.h"
  31 #include "LyXRC.h"
  32 #include "MetricsInfo.h"
  33 #include "qt_helpers.h"
  34 #include "version.h"
  35
  36 #include "graphics/GraphicsImage.h"
  37 #include "graphics/GraphicsLoader.h"
  38
  39 #include "support/debug.h"
  40 #include "support/gettext.h"
  41 #include "support/FileName.h"
  42 #include "support/ForkedCalls.h"
  43
  44 #include "frontends/Application.h"
  45 #include "frontends/FontMetrics.h"
  46 #include "frontends/WorkAreaManager.h"
  47
  48 #include <QContextMenuEvent>
  49 #include <QInputContext>
  50 #include <QHelpEvent>
  51 #include <QLayout>
  52 #include <QMainWindow>
  53 #include <QPainter>
  54 #include <QPalette>
  55 #include <QScrollBar>
  56 #include <QTabBar>
  57 #include <QTimer>
  58 #include <QToolButton>
  59
  60 #include <boost/bind.hpp>
  61
  62 #ifdef Q_WS_X11
  63 #include <QX11Info>
  64 extern "C" int XEventsQueued(Display *display, int mode);
  65 #endif
  66
  67 #ifdef Q_WS_WIN
  68 int const CursorWidth = 2;
  69 #else
  70 int const CursorWidth = 1;
  71 #endif
  72
  73 #undef KeyPress
  74 #undef NoModifier
  75
  76 using namespace std;
  77 using namespace lyx::support;
  78
  79 namespace lyx {
  80
  81
  82 /// return the LyX mouse button state from Qt's
  83 static mouse_button::state q_button_state(Qt::MouseButton button)
  84 {
  85         mouse_button::state b = mouse_button::none;
  86         switch (button) {
  87                 case Qt::LeftButton:
  88                         b = mouse_button::button1;
  89                         break;
  90                 case Qt::MidButton:
  91                         b = mouse_button::button2;
  92                         break;
  93                 case Qt::RightButton:
  94                         b = mouse_button::button3;
  95                         break;
  96                 default:
  97                         break;
  98         }
  99         return b;
 100 }
 101
 102
 103 /// return the LyX mouse button state from Qt's
 104 mouse_button::state q_motion_state(Qt::MouseButtons state)
 105 {
 106         mouse_button::state b = mouse_button::none;
 107         if (state & Qt::LeftButton)
 108                 b |= mouse_button::button1;
 109         if (state & Qt::MidButton)
 110                 b |= mouse_button::button2;
 111         if (state & Qt::RightButton)
 112                 b |= mouse_button::button3;
 113         return b;
 114 }
 115
 116
 117 namespace frontend {
 118
 119 class CursorWidget {
 120 public:
 121         CursorWidget() {}
 122
 123         void draw(QPainter & painter)
 124         {
 125                 if (show_ && rect_.isValid()) {
 126                         switch (shape_) {
 127                         case L_SHAPE:
 128                                 painter.fillRect(rect_.x(), rect_.y(), CursorWidth, rect_.height(), color_);
 129                                 painter.setPen(color_);
 130                                 painter.drawLine(rect_.bottomLeft().x() + CursorWidth, rect_.bottomLeft().y(),
 131                                                                                                  rect_.bottomRight().x(), rect_.bottomLeft().y());
 132                                 break;
 133
 134                         case REVERSED_L_SHAPE:
 135                                 painter.fillRect(rect_.x() + rect_.height() / 3, rect_.y(), CursorWidth, rect_.height(), color_);
 136                                 painter.setPen(color_);
 137                                 painter.drawLine(rect_.bottomRight().x() - CursorWidth, rect_.bottomLeft().y(),
 138                                                                                                          rect_.bottomLeft().x(), rect_.bottomLeft().y());
 139                                 break;
 140
 141                         default:
 142                                 painter.fillRect(rect_, color_);
 143                                 break;
 144                         }
 145                 }
 146         }
 147
 148         void update(int x, int y, int h, CursorShape shape)
 149         {
 150                 color_ = guiApp->colorCache().get(Color_cursor);
 151                 shape_ = shape;
 152                 switch (shape) {
 153                 case L_SHAPE:
 154                         rect_ = QRect(x, y, CursorWidth + h / 3, h);
 155                         break;
 156                 case REVERSED_L_SHAPE:
 157                         rect_ = QRect(x - h / 3, y, CursorWidth + h / 3, h);
 158                         break;
 159                 default:
 160                         rect_ = QRect(x, y, CursorWidth, h);
 161                         break;
 162                 }
 163         }
 164
 165         void show(bool set_show = true) { show_ = set_show; }
 166         void hide() { show_ = false; }
 167
 168         QRect const & rect() { return rect_; }
 169
 170 private:
 171         ///
 172         CursorShape shape_;
 173         ///
 174         bool show_;
 175         ///
 176         QColor color_;
 177         ///
 178         QRect rect_;
 179 };
 180
 181
 182 // This is a 'heartbeat' generating synthetic mouse move events when the
 183 // cursor is at the top or bottom edge of the viewport. One scroll per 0.2 s
 184 SyntheticMouseEvent::SyntheticMouseEvent()
 185         : timeout(200), restart_timeout(true),
 186           x_old(-1), y_old(-1), scrollbar_value_old(-1.0)
 187 {}
 188
 189
 190
 191 GuiWorkArea::GuiWorkArea(Buffer & buffer, GuiView & lv)
 192         : buffer_view_(new BufferView(buffer)), lyx_view_(&lv),
 193           cursor_visible_(false),
 194     need_resize_(false), schedule_redraw_(false),
 195                 preedit_lines_(1)
 196 {
 197         buffer.workAreaManager().add(this);
 198         // Setup the signals
 199         cursor_timeout_.setInterval(400);
 200         connect(&cursor_timeout_, SIGNAL(timeout()),
 201                 this, SLOT(toggleCursor()));
 202
 203         cursor_timeout_.start();
 204
 205         screen_ = QPixmap(viewport()->width(), viewport()->height());
 206         cursor_ = new frontend::CursorWidget();
 207         cursor_->hide();
 208
 209         setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
 210         setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 211         setAcceptDrops(true);
 212         setMouseTracking(true);
 213         setMinimumSize(100, 70);
 214         updateWindowTitle();
 215
 216         viewport()->setAutoFillBackground(false);
 217         // We don't need double-buffering nor SystemBackground on
 218         // the viewport because we have our own backing pixmap.
 219         viewport()->setAttribute(Qt::WA_NoSystemBackground);
 220
 221         setFocusPolicy(Qt::WheelFocus);
 222
 223         viewport()->setCursor(Qt::IBeamCursor);
 224
 225         synthetic_mouse_event_.timeout.timeout.connect(
 226                 boost::bind(&GuiWorkArea::generateSyntheticMouseEvent,
 227                                         this));
 228
 229         // Initialize the vertical Scroll Bar
 230         QObject::connect(verticalScrollBar(), SIGNAL(actionTriggered(int)),
 231                 this, SLOT(adjustViewWithScrollBar(int)));
 232
 233         // disable context menu for the scrollbar
 234         verticalScrollBar()->setContextMenuPolicy(Qt::NoContextMenu);
 235
 236         // PageStep only depends on the viewport height.
 237         verticalScrollBar()->setPageStep(viewport()->height());
 238
 239         LYXERR(Debug::GUI, "viewport width: " << viewport()->width()
 240                 << "  viewport height: " << viewport()->height());
 241
 242         // Enables input methods for asian languages.
 243         // Must be set when creating custom text editing widgets.
 244         setAttribute(Qt::WA_InputMethodEnabled, true);
 245 }
 246
 247
 248
 249 GuiWorkArea::~GuiWorkArea()
 250 {
 251         buffer_view_->buffer().workAreaManager().remove(this);
 252         delete buffer_view_;
 253         delete cursor_;
 254 }
 255
 256
 257 void GuiWorkArea::close()
 258 {
 259         lyx_view_->removeWorkArea(this);
 260 }
 261
 262
 263 BufferView & GuiWorkArea::bufferView()
 264 {
 265         return *buffer_view_;
 266 }
 267
 268
 269 BufferView const & GuiWorkArea::bufferView() const
 270 {
 271         return *buffer_view_;
 272 }
 273
 274
 275 void GuiWorkArea::stopBlinkingCursor()
 276 {
 277         cursor_timeout_.stop();
 278         hideCursor();
 279 }
 280
 281
 282 void GuiWorkArea::startBlinkingCursor()
 283 {
 284         showCursor();
 285         cursor_timeout_.start();
 286 }
 287
 288
 289 void GuiWorkArea::redraw()
 290 {
 291         if (!isVisible())
 292                 // No need to redraw in this case.
 293                 return;
 294
 295         // No need to do anything if this is the current view. The BufferView
 296         // metrics are already up to date.
 297         if (lyx_view_ != guiApp->currentView()) {
 298                 // FIXME: it would be nice to optimize for the off-screen case.
 299                 buffer_view_->updateMetrics();
 300                 buffer_view_->cursor().fixIfBroken();
 301         }
 302
 303         // update cursor position, because otherwise it has to wait until
 304         // the blinking interval is over
 305         if (cursor_visible_) {
 306                 hideCursor();
 307                 showCursor();
 308         }
 309
 310         LYXERR(Debug::WORKAREA, "WorkArea::redraw screen");
 311         updateScreen();
 312         update(0, 0, viewport()->width(), viewport()->height());
 313
 314         /// \warning: scrollbar updating *must* be done after the BufferView is drawn
 315         /// because \c BufferView::updateScrollbar() is called in \c BufferView::draw().
 316         updateScrollbar();
 317         lyx_view_->updateStatusBar();
 318
 319         if (lyxerr.debugging(Debug::WORKAREA))
 320                 buffer_view_->coordCache().dump();
 321 }
 322
 323
 324 void GuiWorkArea::processKeySym(KeySymbol const & key, KeyModifier mod)
 325 {
 326         // In order to avoid bad surprise in the middle of an operation,
 327         // we better stop the blinking cursor.
 328         stopBlinkingCursor();
 329
 330         theLyXFunc().setLyXView(lyx_view_);
 331         theLyXFunc().processKeySym(key, mod);
 332 }
 333
 334
 335 void GuiWorkArea::dispatch(FuncRequest const & cmd0, KeyModifier mod)
 336 {
 337         // Handle drag&drop
 338         if (cmd0.action == LFUN_FILE_OPEN) {
 339                 lyx_view_->dispatch(cmd0);
 340                 return;
 341         }
 342
 343         theLyXFunc().setLyXView(lyx_view_);
 344
 345         FuncRequest cmd;
 346
 347         if (cmd0.action == LFUN_MOUSE_PRESS) {
 348                 if (mod == ShiftModifier)
 349                         cmd = FuncRequest(cmd0, "region-select");
 350                 else if (mod == ControlModifier)
 351                         cmd = FuncRequest(cmd0, "paragraph-select");
 352                 else
 353                         cmd = cmd0;
 354         }
 355         else
 356                 cmd = cmd0;
 357
 358         // In order to avoid bad surprise in the middle of an operation, we better stop
 359         // the blinking cursor.
 360         if (!(cmd.action == LFUN_MOUSE_MOTION
 361                 && cmd.button() == mouse_button::none))
 362                 stopBlinkingCursor();
 363
 364         buffer_view_->mouseEventDispatch(cmd);
 365
 366         // Skip these when selecting
 367         if (cmd.action != LFUN_MOUSE_MOTION) {
 368                 lyx_view_->updateLayoutList();
 369                 lyx_view_->updateToolbars();
 370         }
 371
 372         // GUI tweaks except with mouse motion with no button pressed.
 373         if (!(cmd.action == LFUN_MOUSE_MOTION
 374                 && cmd.button() == mouse_button::none)) {
 375                 // Slight hack: this is only called currently when we
 376                 // clicked somewhere, so we force through the display
 377                 // of the new status here.
 378                 lyx_view_->clearMessage();
 379
 380                 // Show the cursor immediately after any operation.
 381                 startBlinkingCursor();
 382         }
 383 }
 384
 385
 386 void GuiWorkArea::resizeBufferView()
 387 {
 388         // WARNING: Please don't put any code that will trigger a repaint here!
 389         // We are already inside a paint event.
 390         lyx_view_->setBusy(true);
 391         buffer_view_->resize(viewport()->width(), viewport()->height());
 392         lyx_view_->updateLayoutList();
 393         lyx_view_->setBusy(false);
 394         need_resize_ = false;
 395 }
 396
 397
 398 void GuiWorkArea::showCursor()
 399 {
 400         if (cursor_visible_)
 401                 return;
 402
 403         CursorShape shape = BAR_SHAPE;
 404
 405         Font const & realfont = buffer_view_->cursor().real_current_font;
 406         BufferParams const & bp = buffer_view_->buffer().params();
 407         bool const samelang = realfont.language() == bp.language;
 408         bool const isrtl = realfont.isVisibleRightToLeft();
 409
 410         if (!samelang || isrtl != bp.language->rightToLeft()) {
 411                 shape = L_SHAPE;
 412                 if (isrtl)
 413                         shape = REVERSED_L_SHAPE;
 414         }
 415
 416         // The ERT language hack needs fixing up
 417         if (realfont.language() == latex_language)
 418                 shape = BAR_SHAPE;
 419
 420         Font const font = buffer_view_->cursor().getFont();
 421         FontMetrics const & fm = theFontMetrics(font);
 422         int const asc = fm.maxAscent();
 423         int const des = fm.maxDescent();
 424         int h = asc + des;
 425         int x = 0;
 426         int y = 0;
 427         buffer_view_->cursor().getPos(x, y);
 428         y -= asc;
 429
 430         // if it doesn't touch the screen, don't try to show it
 431         if (y + h < 0 || y >= viewport()->height())
 432                 return;
 433
 434         cursor_visible_ = true;
 435         showCursor(x, y, h, shape);
 436 }
 437
 438
 439 void GuiWorkArea::hideCursor()
 440 {
 441         if (!cursor_visible_)
 442                 return;
 443
 444         cursor_visible_ = false;
 445         removeCursor();
 446 }
 447
 448
 449 void GuiWorkArea::toggleCursor()
 450 {
 451         if (cursor_visible_)
 452                 hideCursor();
 453         else
 454                 showCursor();
 455
 456         // Use this opportunity to deal with any child processes that
 457         // have finished but are waiting to communicate this fact
 458         // to the rest of LyX.
 459         ForkedCallsController::handleCompletedProcesses();
 460 }
 461
 462
 463 void GuiWorkArea::updateScrollbar()
 464 {
 465         verticalScrollBar()->setTracking(false);
 466
 467         ScrollbarParameters const & scroll_ = buffer_view_->scrollbarParameters();
 468
 469         // do what cursor movement does (some grey)
 470         int const h = scroll_.height + viewport()->height() / 4;
 471         int scroll_max_ = max(0, h - viewport()->height());
 472
 473         verticalScrollBar()->setRange(0, scroll_max_);
 474         verticalScrollBar()->setSliderPosition(scroll_.position);
 475         verticalScrollBar()->setSingleStep(scroll_.lineScrollHeight);
 476         verticalScrollBar()->setValue(scroll_.position);
 477
 478         verticalScrollBar()->setTracking(true);
 479 }
 480
 481
 482 void GuiWorkArea::adjustViewWithScrollBar(int action)
 483 {
 484         stopBlinkingCursor();
 485         if (action == QAbstractSlider::SliderPageStepAdd)
 486                 buffer_view_->scrollDown(viewport()->height());
 487         else if (action == QAbstractSlider::SliderPageStepSub)
 488                 buffer_view_->scrollUp(viewport()->height());
 489         else
 490                 buffer_view_->scrollDocView(verticalScrollBar()->sliderPosition());
 491
 492         if (lyxrc.cursor_follows_scrollbar) {
 493                 buffer_view_->setCursorFromScrollbar();
 494                 lyx_view_->updateLayoutList();
 495         }
 496         // Show the cursor immediately after any operation.
 497         startBlinkingCursor();
 498         QApplication::syncX();
 499 }
 500
 501
 502 bool GuiWorkArea::event(QEvent * e)
 503 {
 504     if (e->type() == QEvent::ToolTip) {
 505          QHelpEvent * helpEvent = static_cast<QHelpEvent *>(e);
 506                  QPoint pos = helpEvent->pos();
 507                  if (pos.x() < viewport()->width()) {
 508                          QString s = toqstr(buffer_view_->toolTip(pos.x(), pos.y()));
 509                  QToolTip::showText(helpEvent->globalPos(), s);
 510                  }
 511          else
 512              QToolTip::hideText();
 513      }
 514      return QAbstractScrollArea::event(e);
 515 }
 516
 517
 518 void GuiWorkArea::contextMenuEvent(QContextMenuEvent * e)
 519 {
 520         QPoint pos = e->pos();
 521         Menu const & menu = buffer_view_->contextMenu(pos.x(), pos.y());
 522         LYXERR(Debug::GUI, "context menu resquested: " << menu.name());
 523
 524         // FIXME: do something with GuiPopupMenu and MenuBackend.
 525         // Some cleanups of GuiPopupMenu and GuiMenubar are needed
 526         // before!
 527         QAbstractScrollArea::contextMenuEvent(e);
 528 }
 529
 530
 531 void GuiWorkArea::focusInEvent(QFocusEvent * /*event*/)
 532 {
 533         // Repaint the whole screen.
 534         // Note: this is different from redraw() as only the backing pixmap
 535         // will be redrawn, which is cheap.
 536         viewport()->repaint();
 537
 538         startBlinkingCursor();
 539 }
 540
 541
 542 void GuiWorkArea::focusOutEvent(QFocusEvent * /*event*/)
 543 {
 544         stopBlinkingCursor();
 545 }
 546
 547
 548 void GuiWorkArea::mousePressEvent(QMouseEvent * e)
 549 {
 550         if (dc_event_.active && dc_event_ == *e) {
 551                 dc_event_.active = false;
 552                 FuncRequest cmd(LFUN_MOUSE_TRIPLE, e->x(), e->y(),
 553                         q_button_state(e->button()));
 554                 dispatch(cmd);
 555                 return;
 556         }
 557
 558         inputContext()->reset();
 559
 560         FuncRequest const cmd(LFUN_MOUSE_PRESS, e->x(), e->y(),
 561                 q_button_state(e->button()));
 562         dispatch(cmd, q_key_state(e->modifiers()));
 563 }
 564
 565
 566 void GuiWorkArea::mouseReleaseEvent(QMouseEvent * e)
 567 {
 568         if (synthetic_mouse_event_.timeout.running())
 569                 synthetic_mouse_event_.timeout.stop();
 570
 571         FuncRequest const cmd(LFUN_MOUSE_RELEASE, e->x(), e->y(),
 572                               q_button_state(e->button()));
 573         dispatch(cmd);
 574 }
 575
 576
 577 void GuiWorkArea::mouseMoveEvent(QMouseEvent * e)
 578 {
 579         // we kill the triple click if we move
 580         doubleClickTimeout();
 581         FuncRequest cmd(LFUN_MOUSE_MOTION, e->x(), e->y(),
 582                               q_motion_state(e->buttons()));
 583
 584         // If we're above or below the work area...
 585         if (e->y() <= 20 || e->y() >= viewport()->height() - 20) {
 586                 // Make sure only a synthetic event can cause a page scroll,
 587                 // so they come at a steady rate:
 588                 if (e->y() <= 20)
 589                         // _Force_ a scroll up:
 590                         cmd.y = -40;
 591                 else
 592                         cmd.y = viewport()->height();
 593                 // Store the event, to be handled when the timeout expires.
 594                 synthetic_mouse_event_.cmd = cmd;
 595
 596                 if (synthetic_mouse_event_.timeout.running())
 597                         // Discard the event. Note that it _may_ be handled
 598                         // when the timeout expires if
 599                         // synthetic_mouse_event_.cmd has not been overwritten.
 600                         // Ie, when the timeout expires, we handle the
 601                         // most recent event but discard all others that
 602                         // occurred after the one used to start the timeout
 603                         // in the first place.
 604                         return;
 605                 else {
 606                         synthetic_mouse_event_.restart_timeout = true;
 607                         synthetic_mouse_event_.timeout.start();
 608                         // Fall through to handle this event...
 609                 }
 610
 611         } else if (synthetic_mouse_event_.timeout.running()) {
 612                 // Store the event, to be possibly handled when the timeout
 613                 // expires.
 614                 // Once the timeout has expired, normal control is returned
 615                 // to mouseMoveEvent (restart_timeout = false).
 616                 // This results in a much smoother 'feel' when moving the
 617                 // mouse back into the work area.
 618                 synthetic_mouse_event_.cmd = cmd;
 619                 synthetic_mouse_event_.restart_timeout = false;
 620                 return;
 621         }
 622
 623         // Has anything changed on-screen since the last QMouseEvent
 624         // was received?
 625         double const scrollbar_value = verticalScrollBar()->value();
 626         if (e->x() != synthetic_mouse_event_.x_old ||
 627             e->y() != synthetic_mouse_event_.y_old ||
 628             scrollbar_value != synthetic_mouse_event_.scrollbar_value_old) {
 629                 // Yes it has. Store the params used to check this.
 630                 synthetic_mouse_event_.x_old = e->x();
 631                 synthetic_mouse_event_.y_old = e->y();
 632                 synthetic_mouse_event_.scrollbar_value_old = scrollbar_value;
 633
 634                 // ... and dispatch the event to the LyX core.
 635                 dispatch(cmd);
 636         }
 637 }
 638
 639
 640 void GuiWorkArea::wheelEvent(QWheelEvent * e)
 641 {
 642         // Wheel rotation by one notch results in a delta() of 120 (see
 643         // documentation of QWheelEvent)
 644         int const lines = qApp->wheelScrollLines() * e->delta() / 120;
 645         verticalScrollBar()->setValue(verticalScrollBar()->value() -
 646                         lines *  verticalScrollBar()->singleStep());
 647         adjustViewWithScrollBar();
 648 }
 649
 650
 651 void GuiWorkArea::generateSyntheticMouseEvent()
 652 {
 653 // Set things off to generate the _next_ 'pseudo' event.
 654         if (synthetic_mouse_event_.restart_timeout)
 655                 synthetic_mouse_event_.timeout.start();
 656
 657         // Has anything changed on-screen since the last timeout signal
 658         // was received?
 659         double const scrollbar_value = verticalScrollBar()->value();
 660         if (scrollbar_value != synthetic_mouse_event_.scrollbar_value_old) {
 661                 // Yes it has. Store the params used to check this.
 662                 synthetic_mouse_event_.scrollbar_value_old = scrollbar_value;
 663
 664                 // ... and dispatch the event to the LyX core.
 665                 dispatch(synthetic_mouse_event_.cmd);
 666         }
 667 }
 668
 669
 670 void GuiWorkArea::keyPressEvent(QKeyEvent * ev)
 671 {
 672         // do nothing if there are other events
 673         // (the auto repeated events come too fast)
 674         // \todo FIXME: remove hard coded Qt keys, process the key binding
 675 #ifdef Q_WS_X11
 676         if (XEventsQueued(QX11Info::display(), 0) > 1 && ev->isAutoRepeat()
 677                         && (Qt::Key_PageDown || Qt::Key_PageUp)) {
 678                 LYXERR(Debug::KEY, "system is busy: scroll key event ignored");
 679                 ev->ignore();
 680                 return;
 681         }
 682 #endif
 683
 684         LYXERR(Debug::KEY, " count: " << ev->count()
 685                 << " text: " << fromqstr(ev->text())
 686                 << " isAutoRepeat: " << ev->isAutoRepeat() << " key: " << ev->key());
 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         // LYXERR(Debug::PAINTING, "paintEvent begin: x: " << rc.x()
 729         //      << " y: " << rc.y() << " w: " << rc.width() << " h: " << rc.height());
 730
 731         if (need_resize_) {
 732                 verticalScrollBar()->setPageStep(viewport()->height());
 733                 screen_ = QPixmap(viewport()->width(), viewport()->height());
 734                 resizeBufferView();
 735                 updateScreen();
 736                 hideCursor();
 737                 showCursor();
 738         }
 739
 740         QPainter pain(viewport());
 741         pain.drawPixmap(rc, screen_, rc);
 742         cursor_->draw(pain);
 743 }
 744
 745
 746 void GuiWorkArea::updateScreen()
 747 {
 748         GuiPainter pain(&screen_);
 749         buffer_view_->draw(pain);
 750 }
 751
 752
 753 void GuiWorkArea::showCursor(int x, int y, int h, CursorShape shape)
 754 {
 755         if (schedule_redraw_) {
 756                 buffer_view_->updateMetrics();
 757                 updateScreen();
 758                 viewport()->update(QRect(0, 0, viewport()->width(), viewport()->height()));
 759                 schedule_redraw_ = false;
 760                 // Show the cursor immediately after the update.
 761                 hideCursor();
 762                 toggleCursor();
 763                 return;
 764         }
 765
 766         cursor_->update(x, y, h, shape);
 767         cursor_->show();
 768         viewport()->update(cursor_->rect());
 769 }
 770
 771
 772 void GuiWorkArea::removeCursor()
 773 {
 774         cursor_->hide();
 775         //if (!qApp->focusWidget())
 776                 viewport()->update(cursor_->rect());
 777 }
 778
 779
 780 void GuiWorkArea::inputMethodEvent(QInputMethodEvent * e)
 781 {
 782         QString const & commit_string = e->commitString();
 783         docstring const & preedit_string
 784                 = qstring_to_ucs4(e->preeditString());
 785
 786         if (!commit_string.isEmpty()) {
 787
 788                 LYXERR(Debug::KEY, "preeditString: " << fromqstr(e->preeditString())
 789                         << " commitString: " << fromqstr(e->commitString()));
 790
 791                 int key = 0;
 792
 793                 // FIXME Iwami 04/01/07: we should take care also of UTF16 surrogates here.
 794                 for (int i = 0; i != commit_string.size(); ++i) {
 795                         QKeyEvent ev(QEvent::KeyPress, key, Qt::NoModifier, commit_string[i]);
 796                         keyPressEvent(&ev);
 797                 }
 798         }
 799
 800         // Hide the cursor during the kana-kanji transformation.
 801         if (preedit_string.empty())
 802                 startBlinkingCursor();
 803         else
 804                 stopBlinkingCursor();
 805
 806         // last_width : for checking if last preedit string was/wasn't empty.
 807         static bool last_width = false;
 808         if (!last_width && preedit_string.empty()) {
 809                 // if last_width is last length of preedit string.
 810                 e->accept();
 811                 return;
 812         }
 813
 814         GuiPainter pain(&screen_);
 815         buffer_view_->updateMetrics();
 816         buffer_view_->draw(pain);
 817         FontInfo font = buffer_view_->cursor().getFont().fontInfo();
 818         FontMetrics const & fm = theFontMetrics(font);
 819         int height = fm.maxHeight();
 820         int cur_x = cursor_->rect().left();
 821         int cur_y = cursor_->rect().bottom();
 822
 823         // redraw area of preedit string.
 824         update(0, cur_y - height, viewport()->width(),
 825                 (height + 1) * preedit_lines_);
 826
 827         if (preedit_string.empty()) {
 828                 last_width = false;
 829                 preedit_lines_ = 1;
 830                 e->accept();
 831                 return;
 832         }
 833         last_width = true;
 834
 835         // att : stores an IM attribute.
 836         QList<QInputMethodEvent::Attribute> const & att = e->attributes();
 837
 838         // get attributes of input method cursor.
 839         // cursor_pos : cursor position in preedit string.
 840         size_t cursor_pos = 0;
 841         bool cursor_is_visible = false;
 842         for (int i = 0; i != att.size(); ++i) {
 843                 if (att.at(i).type == QInputMethodEvent::Cursor) {
 844                         cursor_pos = att.at(i).start;
 845                         cursor_is_visible = att.at(i).length != 0;
 846                         break;
 847                 }
 848         }
 849
 850         size_t preedit_length = preedit_string.length();
 851
 852         // get position of selection in input method.
 853         // FIXME: isn't there a way to do this simplier?
 854         // rStart : cursor position in selected string in IM.
 855         size_t rStart = 0;
 856         // rLength : selected string length in IM.
 857         size_t rLength = 0;
 858         if (cursor_pos < preedit_length) {
 859                 for (int i = 0; i != att.size(); ++i) {
 860                         if (att.at(i).type == QInputMethodEvent::TextFormat) {
 861                                 if (att.at(i).start <= int(cursor_pos)
 862                                         && int(cursor_pos) < att.at(i).start + att.at(i).length) {
 863                                                 rStart = att.at(i).start;
 864                                                 rLength = att.at(i).length;
 865                                                 if (!cursor_is_visible)
 866                                                         cursor_pos += rLength;
 867                                                 break;
 868                                 }
 869                         }
 870                 }
 871         }
 872         else {
 873                 rStart = cursor_pos;
 874                 rLength = 0;
 875         }
 876
 877         int const right_margin = rightMargin();
 878         Painter::preedit_style ps;
 879         // Most often there would be only one line:
 880         preedit_lines_ = 1;
 881         for (size_t pos = 0; pos != preedit_length; ++pos) {
 882                 char_type const typed_char = preedit_string[pos];
 883                 // reset preedit string style
 884                 ps = Painter::preedit_default;
 885
 886                 // if we reached the right extremity of the screen, go to next line.
 887                 if (cur_x + fm.width(typed_char) > viewport()->width() - right_margin) {
 888                         cur_x = right_margin;
 889                         cur_y += height + 1;
 890                         ++preedit_lines_;
 891                 }
 892                 // preedit strings are displayed with dashed underline
 893                 // and partial strings are displayed white on black indicating
 894                 // that we are in selecting mode in the input method.
 895                 // FIXME: rLength == preedit_length is not a changing condition
 896                 // FIXME: should be put out of the loop.
 897                 if (pos >= rStart
 898                         && pos < rStart + rLength
 899                         && !(cursor_pos < rLength && rLength == preedit_length))
 900                         ps = Painter::preedit_selecting;
 901
 902                 if (pos == cursor_pos
 903                         && (cursor_pos < rLength && rLength == preedit_length))
 904                         ps = Painter::preedit_cursor;
 905
 906                 // draw one character and update cur_x.
 907                 cur_x += pain.preeditText(cur_x, cur_y, typed_char, font, ps);
 908         }
 909
 910         // update the preedit string screen area.
 911         update(0, cur_y - preedit_lines_*height, viewport()->width(),
 912                 (height + 1) * preedit_lines_);
 913
 914         // Don't forget to accept the event!
 915         e->accept();
 916 }
 917
 918
 919 QVariant GuiWorkArea::inputMethodQuery(Qt::InputMethodQuery query) const
 920 {
 921         QRect cur_r(0,0,0,0);
 922         switch (query) {
 923                 // this is the CJK-specific composition window position.
 924                 case Qt::ImMicroFocus:
 925                         cur_r = cursor_->rect();
 926                         if (preedit_lines_ != 1)
 927                                 cur_r.moveLeft(10);
 928                         cur_r.moveBottom(cur_r.bottom() + cur_r.height() * preedit_lines_);
 929                         // return lower right of cursor in LyX.
 930                         return cur_r;
 931                 default:
 932                         return QWidget::inputMethodQuery(query);
 933         }
 934 }
 935
 936
 937 void GuiWorkArea::updateWindowTitle()
 938 {
 939         docstring maximize_title;
 940         docstring minimize_title;
 941
 942         Buffer & buf = buffer_view_->buffer();
 943         FileName const fileName = buf.fileName();
 944         if (!fileName.empty()) {
 945                 maximize_title = fileName.displayName(30);
 946                 minimize_title = from_utf8(fileName.onlyFileName());
 947                 if (!buf.isClean()) {
 948                         maximize_title += _(" (changed)");
 949                         minimize_title += char_type('*');
 950                 }
 951                 if (buf.isReadonly())
 952                         maximize_title += _(" (read only)");
 953         }
 954
 955         QString title = windowTitle();
 956         QString new_title = toqstr(maximize_title);
 957         if (title == new_title)
 958                 return;
 959
 960         QWidget::setWindowTitle(new_title);
 961         QWidget::setWindowIconText(toqstr(minimize_title));
 962         titleChanged(this);
 963 }
 964
 965
 966 void GuiWorkArea::setReadOnly(bool)
 967 {
 968         updateWindowTitle();
 969         if (this == lyx_view_->currentWorkArea())
 970                 lyx_view_->updateBufferDependent(false);
 971 }
 972
 973
 974 ////////////////////////////////////////////////////////////////////
 975 //
 976 // TabWorkArea
 977 //
 978 ////////////////////////////////////////////////////////////////////
 979
 980 TabWorkArea::TabWorkArea(QWidget * parent) : QTabWidget(parent)
 981 {
 982         QPalette pal = palette();
 983         pal.setColor(QPalette::Active, QPalette::Button,
 984                 pal.color(QPalette::Active, QPalette::Window));
 985         pal.setColor(QPalette::Disabled, QPalette::Button,
 986                 pal.color(QPalette::Disabled, QPalette::Window));
 987         pal.setColor(QPalette::Inactive, QPalette::Button,
 988                 pal.color(QPalette::Inactive, QPalette::Window));
 989
 990         QToolButton * closeTabButton = new QToolButton(this);
 991     closeTabButton->setPalette(pal);
 992         closeTabButton->setIcon(QIcon(":/images/closetab.png"));
 993         closeTabButton->setText("Close");
 994         closeTabButton->setAutoRaise(true);
 995         closeTabButton->setCursor(Qt::ArrowCursor);
 996         closeTabButton->setToolTip(tr("Close tab"));
 997         closeTabButton->setEnabled(true);
 998
 999         QObject::connect(this, SIGNAL(currentChanged(int)),
1000                 this, SLOT(on_currentTabChanged(int)));
1001         QObject::connect(closeTabButton, SIGNAL(clicked()),
1002                 this, SLOT(closeCurrentTab()));
1003
1004         setCornerWidget(closeTabButton);
1005         setUsesScrollButtons(true);
1006 }
1007
1008
1009 void TabWorkArea::showBar(bool show)
1010 {
1011         tabBar()->setEnabled(show);
1012         tabBar()->setVisible(show);
1013 }
1014
1015
1016 GuiWorkArea * TabWorkArea::currentWorkArea()
1017 {
1018         if (count() == 0)
1019                 return 0;
1020
1021         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(currentWidget());
1022         BOOST_ASSERT(wa);
1023         return wa;
1024 }
1025
1026
1027 GuiWorkArea * TabWorkArea::workArea(Buffer & buffer)
1028 {
1029         for (int i = 0; i != count(); ++i) {
1030                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i));
1031                 BOOST_ASSERT(wa);
1032                 if (&wa->bufferView().buffer() == &buffer)
1033                         return wa;
1034         }
1035         return 0;
1036 }
1037
1038
1039 void TabWorkArea::closeAll()
1040 {
1041         while (count()) {
1042                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(0));
1043                 BOOST_ASSERT(wa);
1044                 removeTab(0);
1045                 delete wa;
1046         }
1047 }
1048
1049
1050 bool TabWorkArea::setCurrentWorkArea(GuiWorkArea * work_area)
1051 {
1052         BOOST_ASSERT(work_area);
1053         int index = indexOf(work_area);
1054         if (index == -1)
1055                 return false;
1056
1057         if (index == currentIndex())
1058                 // Make sure the work area is up to date.
1059                 on_currentTabChanged(index);
1060         else
1061                 // Switch to the work area.
1062                 setCurrentIndex(index);
1063         work_area->setFocus();
1064
1065         return true;
1066 }
1067
1068
1069 GuiWorkArea * TabWorkArea::addWorkArea(Buffer & buffer, GuiView & view)
1070 {
1071         GuiWorkArea * wa = new GuiWorkArea(buffer, view);
1072         wa->setUpdatesEnabled(false);
1073         // Hide tabbar if there's no tab (avoid a resize and a flashing tabbar
1074         // when hiding it again below).
1075         showBar(count() > 0);
1076         addTab(wa, wa->windowTitle());
1077         QObject::connect(wa, SIGNAL(titleChanged(GuiWorkArea *)),
1078                 this, SLOT(updateTabText(GuiWorkArea *)));
1079         // Hide tabbar if there's only one tab.
1080         showBar(count() > 1);
1081         return wa;
1082 }
1083
1084
1085 bool TabWorkArea::removeWorkArea(GuiWorkArea * work_area)
1086 {
1087         BOOST_ASSERT(work_area);
1088         int index = indexOf(work_area);
1089         if (index == -1)
1090                 return false;
1091
1092         work_area->setUpdatesEnabled(false);
1093         removeTab(index);
1094         delete work_area;
1095
1096         if (count()) {
1097                 // make sure the next work area is enabled.
1098                 currentWidget()->setUpdatesEnabled(true);
1099                 // Hide tabbar if there's only one tab.
1100                 showBar(count() > 1);
1101         }
1102         return true;
1103 }
1104
1105
1106 void TabWorkArea::on_currentTabChanged(int i)
1107 {
1108         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i));
1109         BOOST_ASSERT(wa);
1110         BufferView & bv = wa->bufferView();
1111         bv.cursor().fixIfBroken();
1112         bv.updateMetrics();
1113         wa->setUpdatesEnabled(true);
1114         wa->redraw();
1115         wa->setFocus();
1116         ///
1117         currentWorkAreaChanged(wa);
1118
1119         LYXERR(Debug::GUI, "currentTabChanged " << i
1120                 << "File" << bv.buffer().absFileName());
1121 }
1122
1123
1124 void TabWorkArea::closeCurrentTab()
1125 {
1126         lyx::dispatch(FuncRequest(LFUN_BUFFER_CLOSE));
1127 }
1128
1129
1130 void TabWorkArea::updateTabText(GuiWorkArea * wa)
1131 {
1132         int const i = indexOf(wa);
1133         if (i < 0)
1134                 return;
1135         setTabText(i, wa->windowTitle());
1136 }
1137
1138 } // namespace frontend
1139 } // namespace lyx
1140
1141 #include "GuiWorkArea_moc.cpp"