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 "ColorCache.h"
  17 #include "FontLoader.h"
  18 #include "Menus.h"
  19
  20 #include "Buffer.h"
  21 #include "BufferParams.h"
  22 #include "BufferView.h"
  23 #include "CoordCache.h"
  24 #include "Cursor.h"
  25 #include "Font.h"
  26 #include "FuncRequest.h"
  27 #include "GuiApplication.h"
  28 #include "GuiCompleter.h"
  29 #include "GuiKeySymbol.h"
  30 #include "GuiPainter.h"
  31 #include "GuiView.h"
  32 #include "KeySymbol.h"
  33 #include "Language.h"
  34 #include "LyXFunc.h"
  35 #include "LyXRC.h"
  36 #include "LyXVC.h"
  37 #include "MetricsInfo.h"
  38 #include "qt_helpers.h"
  39 #include "Text.h"
  40 #include "version.h"
  41
  42 #include "graphics/GraphicsImage.h"
  43 #include "graphics/GraphicsLoader.h"
  44
  45 #include "support/debug.h"
  46 #include "support/gettext.h"
  47 #include "support/FileName.h"
  48
  49 #include "frontends/Application.h"
  50 #include "frontends/FontMetrics.h"
  51 #include "frontends/WorkAreaManager.h"
  52
  53 #include <QContextMenuEvent>
  54 #include <QInputContext>
  55 #include <QHelpEvent>
  56 #ifdef Q_WS_MACX
  57 #include <QMacStyle>
  58 #endif
  59 #include <QMainWindow>
  60 #include <QMenu>
  61 #include <QPainter>
  62 #include <QPalette>
  63 #include <QPixmapCache>
  64 #include <QScrollBar>
  65 #include <QTimer>
  66 #include <QToolButton>
  67 #include <QToolTip>
  68 #include <QMenuBar>
  69
  70 #include <boost/bind.hpp>
  71
  72 #include <cmath>
  73
  74 #ifdef Q_WS_X11
  75 #include <QX11Info>
  76 extern "C" int XEventsQueued(Display *display, int mode);
  77 #endif
  78
  79 #ifdef Q_WS_WIN
  80 int const CursorWidth = 2;
  81 #else
  82 int const CursorWidth = 1;
  83 #endif
  84 int const TabIndicatorWidth = 3;
  85
  86 #undef KeyPress
  87 #undef NoModifier
  88
  89 using namespace std;
  90 using namespace lyx::support;
  91
  92 namespace lyx {
  93
  94
  95 /// return the LyX mouse button state from Qt's
  96 static mouse_button::state q_button_state(Qt::MouseButton button)
  97 {
  98         mouse_button::state b = mouse_button::none;
  99         switch (button) {
 100                 case Qt::LeftButton:
 101                         b = mouse_button::button1;
 102                         break;
 103                 case Qt::MidButton:
 104                         b = mouse_button::button2;
 105                         break;
 106                 case Qt::RightButton:
 107                         b = mouse_button::button3;
 108                         break;
 109                 default:
 110                         break;
 111         }
 112         return b;
 113 }
 114
 115
 116 /// return the LyX mouse button state from Qt's
 117 mouse_button::state q_motion_state(Qt::MouseButtons state)
 118 {
 119         mouse_button::state b = mouse_button::none;
 120         if (state & Qt::LeftButton)
 121                 b |= mouse_button::button1;
 122         if (state & Qt::MidButton)
 123                 b |= mouse_button::button2;
 124         if (state & Qt::RightButton)
 125                 b |= mouse_button::button3;
 126         return b;
 127 }
 128
 129
 130 namespace frontend {
 131
 132 class CursorWidget {
 133 public:
 134         CursorWidget() {}
 135
 136         void draw(QPainter & painter)
 137         {
 138                 if (!show_ || !rect_.isValid())
 139                         return;
 140
 141                 int y = rect_.top();
 142                 int l = x_ - rect_.left();
 143                 int r = rect_.right() - x_;
 144                 int bot = rect_.bottom();
 145
 146                 // draw vertica linel
 147                 painter.fillRect(x_, y, CursorWidth, rect_.height(), color_);
 148
 149                 // draw RTL/LTR indication
 150                 painter.setPen(color_);
 151                 if (l_shape_) {
 152                         if (rtl_)
 153                                 painter.drawLine(x_, bot, x_ - l, bot);
 154                         else
 155                                 painter.drawLine(x_, bot, x_ + CursorWidth + r, bot);
 156                 }
 157
 158                 // draw completion triangle
 159                 if (completable_) {
 160                         int m = y + rect_.height() / 2;
 161                         int d = TabIndicatorWidth - 1;
 162                         if (rtl_) {
 163                                 painter.drawLine(x_ - 1, m - d, x_ - 1 - d, m);
 164                                 painter.drawLine(x_ - 1, m + d, x_ - 1 - d, m);
 165                         } else {
 166                                 painter.drawLine(x_ + CursorWidth, m - d, x_ + CursorWidth + d, m);
 167                                 painter.drawLine(x_ + CursorWidth, m + d, x_ + CursorWidth + d, m);
 168                         }
 169                 }
 170         }
 171
 172         void update(int x, int y, int h, bool l_shape,
 173                 bool rtl, bool completable)
 174         {
 175                 color_ = guiApp->colorCache().get(Color_cursor);
 176                 l_shape_ = l_shape;
 177                 rtl_ = rtl;
 178                 completable_ = completable;
 179                 x_ = x;
 180
 181                 // extension to left and right
 182                 int l = 0;
 183                 int r = 0;
 184
 185                 // RTL/LTR indication
 186                 if (l_shape_) {
 187                         if (rtl)
 188                                 l += h / 3;
 189                         else
 190                                 r += h / 3;
 191                 }
 192
 193                 // completion triangle
 194                 if (completable_) {
 195                         if (rtl)
 196                                 l = max(l, TabIndicatorWidth);
 197                         else
 198                                 r = max(r, TabIndicatorWidth);
 199                 }
 200
 201                 // compute overall rectangle
 202                 rect_ = QRect(x - l, y, CursorWidth + r + l, h);
 203         }
 204
 205         void show(bool set_show = true) { show_ = set_show; }
 206         void hide() { show_ = false; }
 207
 208         QRect const & rect() { return rect_; }
 209
 210 private:
 211         /// cursor is in RTL or LTR text
 212         bool rtl_;
 213         /// indication for RTL or LTR
 214         bool l_shape_;
 215         /// triangle to show that a completion is available
 216         bool completable_;
 217         ///
 218         bool show_;
 219         ///
 220         QColor color_;
 221         /// rectangle, possibly with l_shape and completion triangle
 222         QRect rect_;
 223         /// x position (were the vertical line is drawn)
 224         int x_;
 225 };
 226
 227
 228 // This is a 'heartbeat' generating synthetic mouse move events when the
 229 // cursor is at the top or bottom edge of the viewport. One scroll per 0.2 s
 230 SyntheticMouseEvent::SyntheticMouseEvent()
 231         : timeout(200), restart_timeout(true),
 232           x_old(-1), y_old(-1), scrollbar_value_old(-1.0)
 233 {}
 234
 235
 236
 237 GuiWorkArea::GuiWorkArea(Buffer & buffer, GuiView & lv)
 238         : buffer_view_(new BufferView(buffer)), lyx_view_(&lv),
 239         cursor_visible_(false),
 240         need_resize_(false), schedule_redraw_(false),
 241         preedit_lines_(1), completer_(new GuiCompleter(this))
 242 {
 243         buffer.workAreaManager().add(this);
 244         // Setup the signals
 245         connect(&cursor_timeout_, SIGNAL(timeout()),
 246                 this, SLOT(toggleCursor()));
 247
 248         int const time = QApplication::cursorFlashTime() / 2;
 249         if (time > 0) {
 250                 cursor_timeout_.setInterval(time);
 251                 cursor_timeout_.start();
 252         } else {
 253                 // let's initialize this just to be safe
 254                 cursor_timeout_.setInterval(500);
 255         }
 256
 257         screen_ = QPixmap(viewport()->width(), viewport()->height());
 258         cursor_ = new frontend::CursorWidget();
 259         cursor_->hide();
 260
 261         // HACK: Prevents an additional redraw when the scrollbar pops up
 262         // which regularily happens on documents with more than one page.
 263         // The policy  should be set to "Qt::ScrollBarAsNeeded" soon.
 264         // Since we have no geometry information yet, we assume that
 265         // a document needs a scrollbar if there is more then four
 266         // paragraph in the outermost text.
 267         if (buffer.text().paragraphs().size() > 4)
 268                 setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
 269         QTimer::singleShot(50, this, SLOT(fixVerticalScrollBar()));
 270
 271
 272         setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 273         setAcceptDrops(true);
 274         setMouseTracking(true);
 275         setMinimumSize(100, 70);
 276 #ifdef Q_WS_MACX
 277         setFrameStyle(QFrame::NoFrame);
 278 #else
 279         setFrameStyle(QFrame::Box);
 280 #endif
 281         updateWindowTitle();
 282
 283         viewport()->setAutoFillBackground(false);
 284         // We don't need double-buffering nor SystemBackground on
 285         // the viewport because we have our own backing pixmap.
 286         viewport()->setAttribute(Qt::WA_NoSystemBackground);
 287
 288         setFocusPolicy(Qt::WheelFocus);
 289
 290         viewport()->setCursor(Qt::IBeamCursor);
 291
 292         synthetic_mouse_event_.timeout.timeout.connect(
 293                 boost::bind(&GuiWorkArea::generateSyntheticMouseEvent,
 294                                         this));
 295
 296         // Initialize the vertical Scroll Bar
 297         QObject::connect(verticalScrollBar(), SIGNAL(valueChanged(int)),
 298                 this, SLOT(scrollTo(int)));
 299
 300         LYXERR(Debug::GUI, "viewport width: " << viewport()->width()
 301                 << "  viewport height: " << viewport()->height());
 302
 303         // Enables input methods for asian languages.
 304         // Must be set when creating custom text editing widgets.
 305         setAttribute(Qt::WA_InputMethodEnabled, true);
 306 }
 307
 308
 309 GuiWorkArea::~GuiWorkArea()
 310 {
 311         buffer_view_->buffer().workAreaManager().remove(this);
 312         delete buffer_view_;
 313         delete cursor_;
 314         // Completer has a QObject parent and is thus automatically destroyed.
 315         // delete completer_;
 316 }
 317
 318
 319 void GuiWorkArea::fixVerticalScrollBar()
 320 {
 321         if (!isFullScreen())
 322                 setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
 323 }
 324
 325
 326 void GuiWorkArea::close()
 327 {
 328         lyx_view_->removeWorkArea(this);
 329 }
 330
 331
 332 void GuiWorkArea::setFullScreen(bool full_screen)
 333 {
 334         buffer_view_->setFullScreen(full_screen);
 335         if (full_screen) {
 336                 setFrameStyle(QFrame::NoFrame);
 337                 if (lyxrc.full_screen_scrollbar)
 338                         setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 339         } else {
 340 #ifdef Q_WS_MACX
 341                 setFrameStyle(QFrame::NoFrame);
 342 #else
 343                 setFrameStyle(QFrame::Box);
 344 #endif
 345                 setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
 346         }
 347 }
 348
 349
 350 BufferView & GuiWorkArea::bufferView()
 351 {
 352         return *buffer_view_;
 353 }
 354
 355
 356 BufferView const & GuiWorkArea::bufferView() const
 357 {
 358         return *buffer_view_;
 359 }
 360
 361
 362 void GuiWorkArea::stopBlinkingCursor()
 363 {
 364         cursor_timeout_.stop();
 365         hideCursor();
 366 }
 367
 368
 369 void GuiWorkArea::startBlinkingCursor()
 370 {
 371         showCursor();
 372         //we're not supposed to cache this value.
 373         int const time = QApplication::cursorFlashTime() / 2;
 374         if (time <= 0)
 375                 return;
 376         cursor_timeout_.setInterval(time);
 377         cursor_timeout_.start();
 378 }
 379
 380
 381 void GuiWorkArea::redraw()
 382 {
 383         if (!isVisible())
 384                 // No need to redraw in this case.
 385                 return;
 386
 387         // No need to do anything if this is the current view. The BufferView
 388         // metrics are already up to date.
 389         if (lyx_view_ != guiApp->currentView()
 390                 || lyx_view_->currentWorkArea() != this) {
 391                 // FIXME: it would be nice to optimize for the off-screen case.
 392                 buffer_view_->updateMetrics();
 393                 buffer_view_->cursor().fixIfBroken();
 394         }
 395
 396         // update cursor position, because otherwise it has to wait until
 397         // the blinking interval is over
 398         if (cursor_visible_) {
 399                 hideCursor();
 400                 showCursor();
 401         }
 402
 403         LYXERR(Debug::WORKAREA, "WorkArea::redraw screen");
 404         updateScreen();
 405         update(0, 0, viewport()->width(), viewport()->height());
 406
 407         /// \warning: scrollbar updating *must* be done after the BufferView is drawn
 408         /// because \c BufferView::updateScrollbar() is called in \c BufferView::draw().
 409         updateScrollbar();
 410         lyx_view_->updateStatusBar();
 411
 412         if (lyxerr.debugging(Debug::WORKAREA))
 413                 buffer_view_->coordCache().dump();
 414 }
 415
 416
 417 void GuiWorkArea::processKeySym(KeySymbol const & key, KeyModifier mod)
 418 {
 419         if (lyx_view_->isFullScreen() && lyx_view_->menuBar()->isVisible()) {
 420                 // FIXME HACK: we should not have to do this here. See related comment
 421                 // in GuiView::event() (QEvent::ShortcutOverride)
 422                 lyx_view_->menuBar()->hide();
 423         }
 424
 425         // In order to avoid bad surprise in the middle of an operation,
 426         // we better stop the blinking cursor...
 427         // the cursor gets restarted in GuiView::restartCursor()
 428         stopBlinkingCursor();
 429
 430         theLyXFunc().setLyXView(lyx_view_);
 431         theLyXFunc().processKeySym(key, mod);
 432 }
 433
 434
 435 void GuiWorkArea::dispatch(FuncRequest const & cmd0, KeyModifier mod)
 436 {
 437         // Handle drag&drop
 438         if (cmd0.action == LFUN_FILE_OPEN) {
 439                 lyx_view_->dispatch(cmd0);
 440                 return;
 441         }
 442
 443         theLyXFunc().setLyXView(lyx_view_);
 444
 445         FuncRequest cmd;
 446
 447         if (cmd0.action == LFUN_MOUSE_PRESS) {
 448                 if (mod == ShiftModifier)
 449                         cmd = FuncRequest(cmd0, "region-select");
 450                 else if (mod == ControlModifier)
 451                         cmd = FuncRequest(cmd0, "paragraph-select");
 452                 else
 453                         cmd = cmd0;
 454         }
 455         else
 456                 cmd = cmd0;
 457
 458         bool const notJustMovingTheMouse =
 459                 cmd.action != LFUN_MOUSE_MOTION || cmd.button() != mouse_button::none;
 460
 461         // In order to avoid bad surprise in the middle of an operation, we better stop
 462         // the blinking cursor.
 463         if (notJustMovingTheMouse)
 464                 stopBlinkingCursor();
 465
 466         buffer_view_->mouseEventDispatch(cmd);
 467
 468         // Skip these when selecting
 469         if (cmd.action != LFUN_MOUSE_MOTION) {
 470                 completer_->updateVisibility(false, false);
 471                 lyx_view_->updateDialogs();
 472                 lyx_view_->updateStatusBar();
 473         }
 474
 475         // GUI tweaks except with mouse motion with no button pressed.
 476         if (notJustMovingTheMouse) {
 477                 // Slight hack: this is only called currently when we
 478                 // clicked somewhere, so we force through the display
 479                 // of the new status here.
 480                 lyx_view_->clearMessage();
 481
 482                 // Show the cursor immediately after any operation
 483                 startBlinkingCursor();
 484         }
 485 }
 486
 487
 488 void GuiWorkArea::resizeBufferView()
 489 {
 490         // WARNING: Please don't put any code that will trigger a repaint here!
 491         // We are already inside a paint event.
 492         lyx_view_->setBusy(true);
 493         buffer_view_->resize(viewport()->width(), viewport()->height());
 494         updateScreen();
 495
 496         // Update scrollbars which might have changed due different
 497         // BufferView dimension. This is especially important when the
 498         // BufferView goes from zero-size to the real-size for the first time,
 499         // as the scrollbar paramters are then set for the first time.
 500         updateScrollbar();
 501
 502         lyx_view_->updateLayoutList();
 503         lyx_view_->setBusy(false);
 504         need_resize_ = false;
 505 }
 506
 507
 508 void GuiWorkArea::showCursor()
 509 {
 510         if (cursor_visible_)
 511                 return;
 512
 513         // RTL or not RTL
 514         bool l_shape = false;
 515         Font const & realfont = buffer_view_->cursor().real_current_font;
 516         BufferParams const & bp = buffer_view_->buffer().params();
 517         bool const samelang = realfont.language() == bp.language;
 518         bool const isrtl = realfont.isVisibleRightToLeft();
 519
 520         if (!samelang || isrtl != bp.language->rightToLeft())
 521                 l_shape = true;
 522
 523         // The ERT language hack needs fixing up
 524         if (realfont.language() == latex_language)
 525                 l_shape = false;
 526
 527         Font const font = buffer_view_->cursor().getFont();
 528         FontMetrics const & fm = theFontMetrics(font);
 529         int const asc = fm.maxAscent();
 530         int const des = fm.maxDescent();
 531         int h = asc + des;
 532         int x = 0;
 533         int y = 0;
 534         Cursor & cur = buffer_view_->cursor();
 535         cur.getPos(x, y);
 536         y -= asc;
 537
 538         // if it doesn't touch the screen, don't try to show it
 539         bool cursorInView = true;
 540         if (y + h < 0 || y >= viewport()->height())
 541                 cursorInView = false;
 542
 543         // show cursor on screen
 544         bool completable = cur.inset().showCompletionCursor()
 545                 && completer_->completionAvailable()
 546                 && !completer_->popupVisible()
 547                 && !completer_->inlineVisible();
 548         if (cursorInView) {
 549                 cursor_visible_ = true;
 550                 showCursor(x, y, h, l_shape, isrtl, completable);
 551         }
 552 }
 553
 554
 555 void GuiWorkArea::hideCursor()
 556 {
 557         if (!cursor_visible_)
 558                 return;
 559
 560         cursor_visible_ = false;
 561         removeCursor();
 562 }
 563
 564
 565 void GuiWorkArea::toggleCursor()
 566 {
 567         if (cursor_visible_)
 568                 hideCursor();
 569         else
 570                 showCursor();
 571 }
 572
 573
 574 void GuiWorkArea::updateScrollbar()
 575 {
 576         ScrollbarParameters const & scroll_ = buffer_view_->scrollbarParameters();
 577         // WARNING: don't touch at the scrollbar value like this:
 578         //   verticalScrollBar()->setValue(scroll_.position);
 579         // because this would cause a recursive signal/slot calling with
 580         // GuiWorkArea::scrollTo
 581         verticalScrollBar()->setRange(scroll_.min, scroll_.max);
 582         verticalScrollBar()->setPageStep(scroll_.page_step);
 583         verticalScrollBar()->setSingleStep(scroll_.single_step);
 584         verticalScrollBar()->setSliderPosition(scroll_.position);
 585 }
 586
 587
 588 void GuiWorkArea::scrollTo(int value)
 589 {
 590         stopBlinkingCursor();
 591         buffer_view_->scrollDocView(value);
 592
 593         if (lyxrc.cursor_follows_scrollbar) {
 594                 buffer_view_->setCursorFromScrollbar();
 595                 lyx_view_->updateLayoutList();
 596         }
 597         // Show the cursor immediately after any operation.
 598         startBlinkingCursor();
 599         QApplication::syncX();
 600 }
 601
 602
 603 bool GuiWorkArea::event(QEvent * e)
 604 {
 605         switch (e->type()) {
 606         case QEvent::ToolTip: {
 607                 QHelpEvent * helpEvent = static_cast<QHelpEvent *>(e);
 608                 if (lyxrc.use_tooltip) {
 609                         QPoint pos = helpEvent->pos();
 610                         if (pos.x() < viewport()->width()) {
 611                                 QString s = toqstr(buffer_view_->toolTip(pos.x(), pos.y()));
 612                                 QToolTip::showText(helpEvent->globalPos(), s);
 613                         }
 614                         else
 615                                 QToolTip::hideText();
 616                 }
 617                 // Don't forget to accept the event!
 618                 e->accept();
 619                 return true;
 620         }
 621
 622         case QEvent::ShortcutOverride: {
 623                 // We catch this event in order to catch the Tab or Shift+Tab key press
 624                 // which are otherwise reserved to focus switching between controls
 625                 // within a dialog.
 626                 QKeyEvent * ke = static_cast<QKeyEvent*>(e);
 627                 if ((ke->key() != Qt::Key_Tab && ke->key() != Qt::Key_Backtab)
 628                         || ke->modifiers() & Qt::ControlModifier)
 629                         return QAbstractScrollArea::event(e);
 630                 keyPressEvent(ke);
 631                 return true;
 632         }
 633
 634         default:
 635                 return QAbstractScrollArea::event(e);
 636         }
 637         return false;
 638 }
 639
 640
 641 void GuiWorkArea::contextMenuEvent(QContextMenuEvent * e)
 642 {
 643         QPoint pos = e->pos();
 644         docstring name = buffer_view_->contextMenu(pos.x(), pos.y());
 645         if (name.empty()) {
 646                 QAbstractScrollArea::contextMenuEvent(e);
 647                 return;
 648         }
 649         QMenu * menu = guiApp->menus().menu(toqstr(name), *lyx_view_);
 650         if (!menu) {
 651                 QAbstractScrollArea::contextMenuEvent(e);
 652                 return;
 653         }
 654         // Position the menu to the right.
 655         // FIXME: menu position should be different for RTL text.
 656         menu->exec(e->globalPos());
 657         e->accept();
 658 }
 659
 660
 661 void GuiWorkArea::focusInEvent(QFocusEvent * e)
 662 {
 663         if (lyx_view_->currentWorkArea() != this)
 664                 lyx_view_->setCurrentWorkArea(this);
 665
 666         startBlinkingCursor();
 667         QAbstractScrollArea::focusInEvent(e);
 668 }
 669
 670
 671 void GuiWorkArea::focusOutEvent(QFocusEvent * e)
 672 {
 673         stopBlinkingCursor();
 674         QAbstractScrollArea::focusOutEvent(e);
 675 }
 676
 677
 678 void GuiWorkArea::mousePressEvent(QMouseEvent * e)
 679 {
 680         if (dc_event_.active && dc_event_ == *e) {
 681                 dc_event_.active = false;
 682                 FuncRequest cmd(LFUN_MOUSE_TRIPLE, e->x(), e->y(),
 683                         q_button_state(e->button()));
 684                 dispatch(cmd);
 685                 e->accept();
 686                 return;
 687         }
 688
 689         inputContext()->reset();
 690
 691         FuncRequest const cmd(LFUN_MOUSE_PRESS, e->x(), e->y(),
 692                 q_button_state(e->button()));
 693         dispatch(cmd, q_key_state(e->modifiers()));
 694         e->accept();
 695 }
 696
 697
 698 void GuiWorkArea::mouseReleaseEvent(QMouseEvent * e)
 699 {
 700         if (synthetic_mouse_event_.timeout.running())
 701                 synthetic_mouse_event_.timeout.stop();
 702
 703         FuncRequest const cmd(LFUN_MOUSE_RELEASE, e->x(), e->y(),
 704                               q_button_state(e->button()));
 705         dispatch(cmd);
 706         e->accept();
 707 }
 708
 709
 710 void GuiWorkArea::mouseMoveEvent(QMouseEvent * e)
 711 {
 712         // we kill the triple click if we move
 713         doubleClickTimeout();
 714         FuncRequest cmd(LFUN_MOUSE_MOTION, e->x(), e->y(),
 715                 q_motion_state(e->buttons()));
 716
 717         e->accept();
 718
 719         // If we're above or below the work area...
 720         if (e->y() <= 20 || e->y() >= viewport()->height() - 20) {
 721                 // Make sure only a synthetic event can cause a page scroll,
 722                 // so they come at a steady rate:
 723                 if (e->y() <= 20)
 724                         // _Force_ a scroll up:
 725                         cmd.y = -40;
 726                 else
 727                         cmd.y = viewport()->height();
 728                 // Store the event, to be handled when the timeout expires.
 729                 synthetic_mouse_event_.cmd = cmd;
 730
 731                 if (synthetic_mouse_event_.timeout.running())
 732                         // Discard the event. Note that it _may_ be handled
 733                         // when the timeout expires if
 734                         // synthetic_mouse_event_.cmd has not been overwritten.
 735                         // Ie, when the timeout expires, we handle the
 736                         // most recent event but discard all others that
 737                         // occurred after the one used to start the timeout
 738                         // in the first place.
 739                         return;
 740
 741                 synthetic_mouse_event_.restart_timeout = true;
 742                 synthetic_mouse_event_.timeout.start();
 743                 // Fall through to handle this event...
 744
 745         } else if (synthetic_mouse_event_.timeout.running()) {
 746                 // Store the event, to be possibly handled when the timeout
 747                 // expires.
 748                 // Once the timeout has expired, normal control is returned
 749                 // to mouseMoveEvent (restart_timeout = false).
 750                 // This results in a much smoother 'feel' when moving the
 751                 // mouse back into the work area.
 752                 synthetic_mouse_event_.cmd = cmd;
 753                 synthetic_mouse_event_.restart_timeout = false;
 754                 return;
 755         }
 756
 757         // Has anything changed on-screen since the last QMouseEvent
 758         // was received?
 759         double const scrollbar_value = verticalScrollBar()->value();
 760         if (e->x() == synthetic_mouse_event_.x_old
 761                 && e->y() == synthetic_mouse_event_.y_old
 762                 && scrollbar_value == synthetic_mouse_event_.scrollbar_value_old) {
 763                 // Nothing changed on-screen since the last QMouseEvent.
 764                 return;
 765         }
 766
 767         // Yes something has changed. Store the params used to check this.
 768         synthetic_mouse_event_.x_old = e->x();
 769         synthetic_mouse_event_.y_old = e->y();
 770         synthetic_mouse_event_.scrollbar_value_old = scrollbar_value;
 771
 772         // ... and dispatch the event to the LyX core.
 773         dispatch(cmd);
 774 }
 775
 776
 777 void GuiWorkArea::wheelEvent(QWheelEvent * ev)
 778 {
 779         // Wheel rotation by one notch results in a delta() of 120 (see
 780         // documentation of QWheelEvent)
 781         int const delta = ev->delta() / 120;
 782         if (ev->modifiers() & Qt::ControlModifier) {
 783                 lyxrc.zoom += 5 * delta;
 784                 if (lyxrc.zoom < 10)
 785                         lyxrc.zoom = 10;
 786                 // The global QPixmapCache is used in GuiPainter to cache text
 787                 // painting so we must reset it.
 788                 QPixmapCache::clear();
 789                 guiApp->fontLoader().update();
 790                 ev->accept();
 791                 lyx::dispatch(FuncRequest(LFUN_SCREEN_FONT_UPDATE));
 792                 return;
 793         }
 794
 795         // Take into account the desktop wide settings.
 796         int const lines = qApp->wheelScrollLines();
 797         int const page_step = verticalScrollBar()->pageStep();
 798         // Test if the wheel mouse is set to one screen at a time.
 799         int scroll_value = lines > page_step
 800                 ? page_step : lines * verticalScrollBar()->singleStep();
 801
 802         // Take into account the rotation.
 803         scroll_value *= delta;
 804
 805         // Take into account user preference.
 806         scroll_value *= lyxrc.mouse_wheel_speed;
 807         LYXERR(Debug::SCROLLING, "wheelScrollLines = " << lines
 808                         << " delta = " << delta << " scroll_value = " << scroll_value
 809                         << " page_step = " << page_step);
 810         // Now scroll.
 811         verticalScrollBar()->setValue(verticalScrollBar()->value() - scroll_value);
 812
 813         ev->accept();
 814 }
 815
 816
 817 void GuiWorkArea::generateSyntheticMouseEvent()
 818 {
 819         // Set things off to generate the _next_ 'pseudo' event.
 820         if (synthetic_mouse_event_.restart_timeout)
 821                 synthetic_mouse_event_.timeout.start();
 822
 823         // Has anything changed on-screen since the last timeout signal
 824         // was received?
 825         double const scrollbar_value = verticalScrollBar()->value();
 826         if (scrollbar_value != synthetic_mouse_event_.scrollbar_value_old) {
 827                 // Yes it has. Store the params used to check this.
 828                 synthetic_mouse_event_.scrollbar_value_old = scrollbar_value;
 829
 830                 // ... and dispatch the event to the LyX core.
 831                 dispatch(synthetic_mouse_event_.cmd);
 832         }
 833 }
 834
 835
 836 void GuiWorkArea::keyPressEvent(QKeyEvent * ev)
 837 {
 838         // intercept some keys if completion popup is visible
 839         if (completer_->popupVisible()) {
 840                 switch (ev->key()) {
 841                 case Qt::Key_Enter:
 842                 case Qt::Key_Return:
 843                         completer_->activate();
 844                         ev->accept();
 845                         return;
 846                 }
 847         }
 848
 849         // intercept keys for the completion
 850         if (ev->key() == Qt::Key_Tab) {
 851                 completer_->tab();
 852                 ev->accept();
 853                 return;
 854         }
 855
 856         if (completer_->popupVisible() && ev->key() == Qt::Key_Escape) {
 857                 completer_->hidePopup();
 858                 ev->accept();
 859                 return;
 860         }
 861
 862         if (completer_->inlineVisible() && ev->key() == Qt::Key_Escape) {
 863                 completer_->hideInline();
 864                 ev->accept();
 865                 return;
 866         }
 867
 868         // do nothing if there are other events
 869         // (the auto repeated events come too fast)
 870         // \todo FIXME: remove hard coded Qt keys, process the key binding
 871 #ifdef Q_WS_X11
 872         if (XEventsQueued(QX11Info::display(), 0) > 1 && ev->isAutoRepeat()
 873                         && (Qt::Key_PageDown || Qt::Key_PageUp)) {
 874                 LYXERR(Debug::KEY, "system is busy: scroll key event ignored");
 875                 ev->ignore();
 876                 return;
 877         }
 878 #endif
 879
 880         LYXERR(Debug::KEY, " count: " << ev->count() << " text: " << ev->text()
 881                 << " isAutoRepeat: " << ev->isAutoRepeat() << " key: " << ev->key());
 882
 883         KeySymbol sym;
 884         setKeySymbol(&sym, ev);
 885         processKeySym(sym, q_key_state(ev->modifiers()));
 886         ev->accept();
 887 }
 888
 889
 890 void GuiWorkArea::doubleClickTimeout()
 891 {
 892         dc_event_.active = false;
 893 }
 894
 895
 896 void GuiWorkArea::mouseDoubleClickEvent(QMouseEvent * ev)
 897 {
 898         dc_event_ = DoubleClick(ev);
 899         QTimer::singleShot(QApplication::doubleClickInterval(), this,
 900                            SLOT(doubleClickTimeout()));
 901         FuncRequest cmd(LFUN_MOUSE_DOUBLE,
 902                         ev->x(), ev->y(),
 903                         q_button_state(ev->button()));
 904         dispatch(cmd);
 905         ev->accept();
 906 }
 907
 908
 909 void GuiWorkArea::resizeEvent(QResizeEvent * ev)
 910 {
 911         QAbstractScrollArea::resizeEvent(ev);
 912         need_resize_ = true;
 913         ev->accept();
 914 }
 915
 916
 917 void GuiWorkArea::update(int x, int y, int w, int h)
 918 {
 919         viewport()->repaint(x, y, w, h);
 920 }
 921
 922
 923 void GuiWorkArea::paintEvent(QPaintEvent * ev)
 924 {
 925         QRect const rc = ev->rect();
 926         // LYXERR(Debug::PAINTING, "paintEvent begin: x: " << rc.x()
 927         //      << " y: " << rc.y() << " w: " << rc.width() << " h: " << rc.height());
 928
 929         if (need_resize_) {
 930                 screen_ = QPixmap(viewport()->width(), viewport()->height());
 931                 resizeBufferView();
 932                 hideCursor();
 933                 showCursor();
 934         }
 935
 936         QPainter pain(viewport());
 937         pain.drawPixmap(rc, screen_, rc);
 938         cursor_->draw(pain);
 939         ev->accept();
 940 }
 941
 942
 943 void GuiWorkArea::updateScreen()
 944 {
 945         GuiPainter pain(&screen_);
 946         buffer_view_->draw(pain);
 947 }
 948
 949
 950 void GuiWorkArea::showCursor(int x, int y, int h,
 951         bool l_shape, bool rtl, bool completable)
 952 {
 953         if (schedule_redraw_) {
 954                 // This happens when a graphic conversion is finished. As we don't know
 955                 // the size of the new graphics, it's better the update everything.
 956                 // We can't use redraw() here because this would trigger a infinite
 957                 // recursive loop with showCursor().
 958                 buffer_view_->resize(viewport()->width(), viewport()->height());
 959                 updateScreen();
 960                 updateScrollbar();
 961                 viewport()->update(QRect(0, 0, viewport()->width(), viewport()->height()));
 962                 schedule_redraw_ = false;
 963                 // Show the cursor immediately after the update.
 964                 hideCursor();
 965                 toggleCursor();
 966                 return;
 967         }
 968
 969         cursor_->update(x, y, h, l_shape, rtl, completable);
 970         cursor_->show();
 971         viewport()->update(cursor_->rect());
 972 }
 973
 974
 975 void GuiWorkArea::removeCursor()
 976 {
 977         cursor_->hide();
 978         //if (!qApp->focusWidget())
 979                 viewport()->update(cursor_->rect());
 980 }
 981
 982
 983 void GuiWorkArea::inputMethodEvent(QInputMethodEvent * e)
 984 {
 985         QString const & commit_string = e->commitString();
 986         docstring const & preedit_string
 987                 = qstring_to_ucs4(e->preeditString());
 988
 989         if (!commit_string.isEmpty()) {
 990
 991                 LYXERR(Debug::KEY, "preeditString: " << e->preeditString()
 992                         << " commitString: " << e->commitString());
 993
 994                 int key = 0;
 995
 996                 // FIXME Iwami 04/01/07: we should take care also of UTF16 surrogates here.
 997                 for (int i = 0; i != commit_string.size(); ++i) {
 998                         QKeyEvent ev(QEvent::KeyPress, key, Qt::NoModifier, commit_string[i]);
 999                         keyPressEvent(&ev);
1000                 }
1001         }
1002
1003         // Hide the cursor during the kana-kanji transformation.
1004         if (preedit_string.empty())
1005                 startBlinkingCursor();
1006         else
1007                 stopBlinkingCursor();
1008
1009         // last_width : for checking if last preedit string was/wasn't empty.
1010         static bool last_width = false;
1011         if (!last_width && preedit_string.empty()) {
1012                 // if last_width is last length of preedit string.
1013                 e->accept();
1014                 return;
1015         }
1016
1017         GuiPainter pain(&screen_);
1018         buffer_view_->updateMetrics();
1019         buffer_view_->draw(pain);
1020         FontInfo font = buffer_view_->cursor().getFont().fontInfo();
1021         FontMetrics const & fm = theFontMetrics(font);
1022         int height = fm.maxHeight();
1023         int cur_x = cursor_->rect().left();
1024         int cur_y = cursor_->rect().bottom();
1025
1026         // redraw area of preedit string.
1027         update(0, cur_y - height, viewport()->width(),
1028                 (height + 1) * preedit_lines_);
1029
1030         if (preedit_string.empty()) {
1031                 last_width = false;
1032                 preedit_lines_ = 1;
1033                 e->accept();
1034                 return;
1035         }
1036         last_width = true;
1037
1038         // att : stores an IM attribute.
1039         QList<QInputMethodEvent::Attribute> const & att = e->attributes();
1040
1041         // get attributes of input method cursor.
1042         // cursor_pos : cursor position in preedit string.
1043         size_t cursor_pos = 0;
1044         bool cursor_is_visible = false;
1045         for (int i = 0; i != att.size(); ++i) {
1046                 if (att.at(i).type == QInputMethodEvent::Cursor) {
1047                         cursor_pos = att.at(i).start;
1048                         cursor_is_visible = att.at(i).length != 0;
1049                         break;
1050                 }
1051         }
1052
1053         size_t preedit_length = preedit_string.length();
1054
1055         // get position of selection in input method.
1056         // FIXME: isn't there a way to do this simplier?
1057         // rStart : cursor position in selected string in IM.
1058         size_t rStart = 0;
1059         // rLength : selected string length in IM.
1060         size_t rLength = 0;
1061         if (cursor_pos < preedit_length) {
1062                 for (int i = 0; i != att.size(); ++i) {
1063                         if (att.at(i).type == QInputMethodEvent::TextFormat) {
1064                                 if (att.at(i).start <= int(cursor_pos)
1065                                         && int(cursor_pos) < att.at(i).start + att.at(i).length) {
1066                                                 rStart = att.at(i).start;
1067                                                 rLength = att.at(i).length;
1068                                                 if (!cursor_is_visible)
1069                                                         cursor_pos += rLength;
1070                                                 break;
1071                                 }
1072                         }
1073                 }
1074         }
1075         else {
1076                 rStart = cursor_pos;
1077                 rLength = 0;
1078         }
1079
1080         int const right_margin = buffer_view_->rightMargin();
1081         Painter::preedit_style ps;
1082         // Most often there would be only one line:
1083         preedit_lines_ = 1;
1084         for (size_t pos = 0; pos != preedit_length; ++pos) {
1085                 char_type const typed_char = preedit_string[pos];
1086                 // reset preedit string style
1087                 ps = Painter::preedit_default;
1088
1089                 // if we reached the right extremity of the screen, go to next line.
1090                 if (cur_x + fm.width(typed_char) > viewport()->width() - right_margin) {
1091                         cur_x = right_margin;
1092                         cur_y += height + 1;
1093                         ++preedit_lines_;
1094                 }
1095                 // preedit strings are displayed with dashed underline
1096                 // and partial strings are displayed white on black indicating
1097                 // that we are in selecting mode in the input method.
1098                 // FIXME: rLength == preedit_length is not a changing condition
1099                 // FIXME: should be put out of the loop.
1100                 if (pos >= rStart
1101                         && pos < rStart + rLength
1102                         && !(cursor_pos < rLength && rLength == preedit_length))
1103                         ps = Painter::preedit_selecting;
1104
1105                 if (pos == cursor_pos
1106                         && (cursor_pos < rLength && rLength == preedit_length))
1107                         ps = Painter::preedit_cursor;
1108
1109                 // draw one character and update cur_x.
1110                 cur_x += pain.preeditText(cur_x, cur_y, typed_char, font, ps);
1111         }
1112
1113         // update the preedit string screen area.
1114         update(0, cur_y - preedit_lines_*height, viewport()->width(),
1115                 (height + 1) * preedit_lines_);
1116
1117         // Don't forget to accept the event!
1118         e->accept();
1119 }
1120
1121
1122 QVariant GuiWorkArea::inputMethodQuery(Qt::InputMethodQuery query) const
1123 {
1124         QRect cur_r(0,0,0,0);
1125         switch (query) {
1126                 // this is the CJK-specific composition window position.
1127                 case Qt::ImMicroFocus:
1128                         cur_r = cursor_->rect();
1129                         if (preedit_lines_ != 1)
1130                                 cur_r.moveLeft(10);
1131                         cur_r.moveBottom(cur_r.bottom() + cur_r.height() * preedit_lines_);
1132                         // return lower right of cursor in LyX.
1133                         return cur_r;
1134                 default:
1135                         return QWidget::inputMethodQuery(query);
1136         }
1137 }
1138
1139
1140 void GuiWorkArea::updateWindowTitle()
1141 {
1142         docstring maximize_title;
1143         docstring minimize_title;
1144
1145         Buffer & buf = buffer_view_->buffer();
1146         FileName const fileName = buf.fileName();
1147         if (!fileName.empty()) {
1148                 maximize_title = fileName.displayName(30);
1149                 minimize_title = from_utf8(fileName.onlyFileName());
1150                 if (buf.lyxvc().inUse())
1151                         maximize_title +=  _(" (version control)");
1152                 if (!buf.isClean()) {
1153                         maximize_title += _(" (changed)");
1154                         minimize_title += char_type('*');
1155                 }
1156                 if (buf.isReadonly())
1157                         maximize_title += _(" (read only)");
1158         }
1159
1160         QString title = windowTitle();
1161         QString new_title = toqstr(maximize_title);
1162         if (title == new_title)
1163                 return;
1164
1165         QWidget::setWindowTitle(new_title);
1166         QWidget::setWindowIconText(toqstr(minimize_title));
1167         titleChanged(this);
1168 }
1169
1170
1171 void GuiWorkArea::setReadOnly(bool)
1172 {
1173         updateWindowTitle();
1174         if (this == lyx_view_->currentWorkArea())
1175                 lyx_view_->updateDialogs();
1176 }
1177
1178
1179 bool GuiWorkArea::isFullScreen()
1180 {
1181         return lyx_view_ && lyx_view_->isFullScreen();
1182 }
1183
1184
1185 ////////////////////////////////////////////////////////////////////
1186 //
1187 // TabWorkArea
1188 //
1189 ////////////////////////////////////////////////////////////////////
1190
1191 #ifdef Q_WS_MACX
1192 class NoTabFrameMacStyle : public QMacStyle {
1193 public:
1194         ///
1195         QRect subElementRect(SubElement element, const QStyleOption * option,
1196                              const QWidget * widget = 0) const
1197         {
1198                 QRect rect = QMacStyle::subElementRect(element, option, widget);
1199                 bool noBar = static_cast<QTabWidget const *>(widget)->count() <= 1;
1200
1201                 // The Qt Mac style puts the contents into a 3 pixel wide box
1202                 // which looks very ugly and not like other Mac applications.
1203                 // Hence we remove this here, and moreover the 16 pixel round
1204                 // frame above if the tab bar is hidden.
1205                 if (element == QStyle::SE_TabWidgetTabContents) {
1206                         rect.adjust(- rect.left(), 0, rect.left(), 0);
1207                         if (noBar)
1208                                 rect.setTop(0);
1209                 }
1210
1211                 return rect;
1212         }
1213 };
1214
1215 NoTabFrameMacStyle noTabFrameMacStyle;
1216 #endif
1217
1218
1219 TabWorkArea::TabWorkArea(QWidget * parent)
1220         : QTabWidget(parent), clicked_tab_(-1)
1221 {
1222 #ifdef Q_WS_MACX
1223         setStyle(&noTabFrameMacStyle);
1224 #endif
1225
1226         QPalette pal = palette();
1227         pal.setColor(QPalette::Active, QPalette::Button,
1228                 pal.color(QPalette::Active, QPalette::Window));
1229         pal.setColor(QPalette::Disabled, QPalette::Button,
1230                 pal.color(QPalette::Disabled, QPalette::Window));
1231         pal.setColor(QPalette::Inactive, QPalette::Button,
1232                 pal.color(QPalette::Inactive, QPalette::Window));
1233
1234         QObject::connect(this, SIGNAL(currentChanged(int)),
1235                 this, SLOT(on_currentTabChanged(int)));
1236
1237         QToolButton * closeBufferButton = new QToolButton(this);
1238         closeBufferButton->setPalette(pal);
1239         // FIXME: rename the icon to closebuffer.png
1240         closeBufferButton->setIcon(QIcon(":/images/closetab.png"));
1241         closeBufferButton->setText("Close File");
1242         closeBufferButton->setAutoRaise(true);
1243         closeBufferButton->setCursor(Qt::ArrowCursor);
1244         closeBufferButton->setToolTip(qt_("Close File"));
1245         closeBufferButton->setEnabled(true);
1246         QObject::connect(closeBufferButton, SIGNAL(clicked()),
1247                 this, SLOT(closeCurrentBuffer()));
1248         setCornerWidget(closeBufferButton, Qt::TopRightCorner);
1249
1250         // setup drag'n'drop
1251         QTabBar* tb = new DragTabBar;
1252         connect(tb, SIGNAL(tabMoveRequested(int, int)),
1253                 this, SLOT(moveTab(int, int)));
1254         tb->setElideMode(Qt::ElideNone);
1255         setTabBar(tb);
1256
1257         // make us responsible for the context menu of the tabbar
1258         tb->setContextMenuPolicy(Qt::CustomContextMenu);
1259         connect(tb, SIGNAL(customContextMenuRequested(const QPoint &)),
1260                 this, SLOT(showContextMenu(const QPoint &)));
1261
1262         setUsesScrollButtons(true);
1263 }
1264
1265
1266 void TabWorkArea::setFullScreen(bool full_screen)
1267 {
1268         for (int i = 0; i != count(); ++i) {
1269                 if (GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i)))
1270                         wa->setFullScreen(full_screen);
1271         }
1272
1273         if (lyxrc.full_screen_tabbar)
1274                 showBar(!full_screen && count()>1);
1275 }
1276
1277
1278 void TabWorkArea::showBar(bool show)
1279 {
1280         tabBar()->setEnabled(show);
1281         tabBar()->setVisible(show);
1282 }
1283
1284
1285 GuiWorkArea * TabWorkArea::currentWorkArea()
1286 {
1287         if (count() == 0)
1288                 return 0;
1289
1290         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(currentWidget());
1291         LASSERT(wa, /**/);
1292         return wa;
1293 }
1294
1295
1296 GuiWorkArea * TabWorkArea::workArea(Buffer & buffer)
1297 {
1298         for (int i = 0; i != count(); ++i) {
1299                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i));
1300                 LASSERT(wa, return 0);
1301                 if (&wa->bufferView().buffer() == &buffer)
1302                         return wa;
1303         }
1304         return 0;
1305 }
1306
1307
1308 void TabWorkArea::closeAll()
1309 {
1310         while (count()) {
1311                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(0));
1312                 LASSERT(wa, /**/);
1313                 removeTab(0);
1314                 delete wa;
1315         }
1316 }
1317
1318
1319 bool TabWorkArea::setCurrentWorkArea(GuiWorkArea * work_area)
1320 {
1321         LASSERT(work_area, /**/);
1322         int index = indexOf(work_area);
1323         if (index == -1)
1324                 return false;
1325
1326         if (index == currentIndex())
1327                 // Make sure the work area is up to date.
1328                 on_currentTabChanged(index);
1329         else
1330                 // Switch to the work area.
1331                 setCurrentIndex(index);
1332         work_area->setFocus();
1333
1334         return true;
1335 }
1336
1337
1338 GuiWorkArea * TabWorkArea::addWorkArea(Buffer & buffer, GuiView & view)
1339 {
1340         GuiWorkArea * wa = new GuiWorkArea(buffer, view);
1341         wa->setUpdatesEnabled(false);
1342         // Hide tabbar if there's no tab (avoid a resize and a flashing tabbar
1343         // when hiding it again below).
1344         if (!(currentWorkArea() && currentWorkArea()->isFullScreen()))
1345                 showBar(count() > 0);
1346         addTab(wa, wa->windowTitle());
1347         QObject::connect(wa, SIGNAL(titleChanged(GuiWorkArea *)),
1348                 this, SLOT(updateTabTexts()));
1349         if (currentWorkArea() && currentWorkArea()->isFullScreen())
1350                 setFullScreen(true);
1351         else
1352                 // Hide tabbar if there's only one tab.
1353                 showBar(count() > 1);
1354
1355         updateTabTexts();
1356
1357         return wa;
1358 }
1359
1360
1361 bool TabWorkArea::removeWorkArea(GuiWorkArea * work_area)
1362 {
1363         LASSERT(work_area, return false);
1364         int index = indexOf(work_area);
1365         if (index == -1)
1366                 return false;
1367
1368         work_area->setUpdatesEnabled(false);
1369         removeTab(index);
1370         delete work_area;
1371
1372         if (count()) {
1373                 // make sure the next work area is enabled.
1374                 currentWidget()->setUpdatesEnabled(true);
1375                 if (currentWorkArea() && currentWorkArea()->isFullScreen())
1376                         setFullScreen(true);
1377                 else
1378                         // Hide tabbar if there's only one tab.
1379                         showBar(count() > 1);
1380         } else {
1381                 lastWorkAreaRemoved();
1382         }
1383
1384         updateTabTexts();
1385
1386         return true;
1387 }
1388
1389
1390 void TabWorkArea::on_currentTabChanged(int i)
1391 {
1392         // returns e.g. on application destruction
1393         if (i == -1)
1394                 return;
1395         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i));
1396         LASSERT(wa, return);
1397         BufferView & bv = wa->bufferView();
1398         bv.cursor().fixIfBroken();
1399         bv.updateMetrics();
1400         wa->setUpdatesEnabled(true);
1401         wa->redraw();
1402         wa->setFocus();
1403         ///
1404         currentWorkAreaChanged(wa);
1405
1406         LYXERR(Debug::GUI, "currentTabChanged " << i
1407                 << "File" << bv.buffer().absFileName());
1408 }
1409
1410
1411 void TabWorkArea::closeCurrentBuffer()
1412 {
1413         if (clicked_tab_ != -1)
1414                 setCurrentIndex(clicked_tab_);
1415
1416         lyx::dispatch(FuncRequest(LFUN_BUFFER_CLOSE));
1417 }
1418
1419
1420 void TabWorkArea::closeCurrentTab()
1421 {
1422         if (clicked_tab_ == -1)
1423                 removeWorkArea(currentWorkArea());
1424         else {
1425                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(clicked_tab_));
1426                 LASSERT(wa, /**/);
1427                 removeWorkArea(wa);
1428         }
1429 }
1430
1431 ///
1432 class DisplayPath {
1433 public:
1434         /// make vector happy
1435         DisplayPath() {}
1436         ///
1437         DisplayPath(int tab, FileName const & filename)
1438                 : tab_(tab)
1439         {
1440                 filename_ = toqstr(filename.onlyFileNameWithoutExt());
1441                 postfix_ = toqstr(filename.absoluteFilePath()).
1442                         split("/", QString::SkipEmptyParts);
1443                 postfix_.pop_back();
1444                 abs_ = toqstr(filename.absoluteFilePath());
1445                 dottedPrefix_ = false;
1446         }
1447
1448         /// Absolute path for debugging.
1449         QString abs() const
1450         {
1451                 return abs_;
1452         }
1453         /// Add the first segment from the postfix or three dots to the prefix.
1454         /// Merge multiple dot tripples. In fact dots are added lazily, i.e. only
1455         /// when really needed.
1456         void shiftPathSegment(bool dotted)
1457         {
1458                 if (postfix_.count() <= 0)
1459                         return;
1460
1461                 if (!dotted) {
1462                         if (dottedPrefix_ && !prefix_.isEmpty())
1463                                 prefix_ += ".../";
1464                         prefix_ += postfix_.front() + "/";
1465                 }
1466                 dottedPrefix_ = dotted && !prefix_.isEmpty();
1467                 postfix_.pop_front();
1468         }
1469         ///
1470         QString displayString() const
1471         {
1472                 if (prefix_.isEmpty())
1473                         return filename_;
1474
1475                 bool dots = dottedPrefix_ || !postfix_.isEmpty();
1476                 return prefix_ + (dots ? ".../" : "") + filename_;
1477         }
1478         ///
1479         QString forecastPathString() const
1480         {
1481                 if (postfix_.count() == 0)
1482                         return displayString();
1483
1484                 return prefix_
1485                         + (dottedPrefix_ ? ".../" : "")
1486                         + postfix_.front() + "/";
1487         }
1488         ///
1489         bool final() const { return postfix_.empty(); }
1490         ///
1491         int tab() const { return tab_; }
1492
1493 private:
1494         ///
1495         QString prefix_;
1496         ///
1497         QStringList postfix_;
1498         ///
1499         QString filename_;
1500         ///
1501         QString abs_;
1502         ///
1503         int tab_;
1504         ///
1505         bool dottedPrefix_;
1506 };
1507
1508
1509 ///
1510 bool operator<(DisplayPath const & a, DisplayPath const & b)
1511 {
1512         return a.displayString() < b.displayString();
1513 }
1514
1515 ///
1516 bool operator==(DisplayPath const & a, DisplayPath const & b)
1517 {
1518         return a.displayString() == b.displayString();
1519 }
1520
1521
1522 void TabWorkArea::updateTabTexts()
1523 {
1524         size_t n = count();
1525         if (n == 0)
1526                 return;
1527         std::list<DisplayPath> paths;
1528         typedef std::list<DisplayPath>::iterator It;
1529
1530         // collect full names first: path into postfix, empty prefix and
1531         // filename without extension
1532         for (size_t i = 0; i < n; ++i) {
1533                 GuiWorkArea * i_wa = dynamic_cast<GuiWorkArea *>(widget(i));
1534                 FileName const fn = i_wa->bufferView().buffer().fileName();
1535                 paths.push_back(DisplayPath(i, fn));
1536         }
1537
1538         // go through path segments and see if it helps to make the path more unique
1539         bool somethingChanged = true;
1540         bool allFinal = false;
1541         while (somethingChanged && !allFinal) {
1542                 // adding path segments changes order
1543                 paths.sort();
1544
1545                 LYXERR(Debug::GUI, "updateTabTexts() iteration start");
1546                 somethingChanged = false;
1547                 allFinal = true;
1548
1549                 // find segments which are not unique (i.e. non-atomic)
1550                 It it = paths.begin();
1551                 It segStart = it;
1552                 QString segString = it->displayString();
1553                 for (; it != paths.end(); ++it) {
1554                         // look to the next item
1555                         It next = it;
1556                         ++next;
1557
1558                         // final?
1559                         allFinal = allFinal && it->final();
1560
1561                         LYXERR(Debug::GUI, "it = " << it->abs()
1562                                << " => " << it->displayString());
1563
1564                         // still the same segment?
1565                         QString nextString;
1566                         if ((next != paths.end()
1567                              && (nextString = next->displayString()) == segString))
1568                                 continue;
1569                         LYXERR(Debug::GUI, "segment ended");
1570
1571                         // only a trivial one with one element?
1572                         if (it == segStart) {
1573                                 // start new segment
1574                                 segStart = next;
1575                                 segString = nextString;
1576                                 continue;
1577                         }
1578
1579                         // we found a non-atomic segment segStart <= sit <= it < next.
1580                         // Shift path segments and hope for the best
1581                         // that it makes the path more unique.
1582                         somethingChanged = true;
1583                         It sit = segStart;
1584                         QString dspString = sit->forecastPathString();
1585                         LYXERR(Debug::GUI, "first forecast found for "
1586                                << sit->abs() << " => " << dspString);
1587                         ++sit;
1588                         bool moreUnique = false;
1589                         for (; sit != next; ++sit) {
1590                                 if (sit->forecastPathString() != dspString) {
1591                                         LYXERR(Debug::GUI, "different forecast found for "
1592                                                 << sit->abs() << " => " << sit->forecastPathString());
1593                                         moreUnique = true;
1594                                         break;
1595                                 }
1596                                 LYXERR(Debug::GUI, "same forecast found for "
1597                                         << sit->abs() << " => " << dspString);
1598                         }
1599
1600                         // if the path segment helped, add it. Otherwise add dots
1601                         bool dots = !moreUnique;
1602                         LYXERR(Debug::GUI, "using dots = " << dots);
1603                         for (sit = segStart; sit != next; ++sit) {
1604                                 sit->shiftPathSegment(dots);
1605                                 LYXERR(Debug::GUI, "shifting "
1606                                         << sit->abs() << " => " << sit->displayString());
1607                         }
1608
1609                         // start new segment
1610                         segStart = next;
1611                         segString = nextString;
1612                 }
1613         }
1614
1615         // set new tab titles
1616         for (It it = paths.begin(); it != paths.end(); ++it) {
1617                 GuiWorkArea * i_wa = dynamic_cast<GuiWorkArea *>(widget(it->tab()));
1618                 Buffer & buf = i_wa->bufferView().buffer();
1619                 if (!buf.fileName().empty() && !buf.isClean())
1620                         setTabText(it->tab(), it->displayString() + "*");
1621                 else
1622                         setTabText(it->tab(), it->displayString());
1623         }
1624 }
1625
1626
1627 void TabWorkArea::showContextMenu(const QPoint & pos)
1628 {
1629         // which tab?
1630         clicked_tab_ = static_cast<DragTabBar *>(tabBar())->tabAt(pos);
1631         if (clicked_tab_ == -1)
1632                 return;
1633
1634         // show tab popup
1635         QMenu popup;
1636         popup.addAction(QIcon(":/images/hidetab.png"),
1637                 qt_("Hide tab"), this, SLOT(closeCurrentTab()));
1638         popup.addAction(QIcon(":/images/closetab.png"),
1639                 qt_("Close tab"), this, SLOT(closeCurrentBuffer()));
1640         popup.exec(tabBar()->mapToGlobal(pos));
1641
1642         clicked_tab_ = -1;
1643 }
1644
1645
1646 void TabWorkArea::moveTab(int fromIndex, int toIndex)
1647 {
1648         QWidget * w = widget(fromIndex);
1649         QIcon icon = tabIcon(fromIndex);
1650         QString text = tabText(fromIndex);
1651
1652         setCurrentIndex(fromIndex);
1653         removeTab(fromIndex);
1654         insertTab(toIndex, w, icon, text);
1655         setCurrentIndex(toIndex);
1656 }
1657
1658
1659 DragTabBar::DragTabBar(QWidget* parent)
1660         : QTabBar(parent)
1661 {
1662         setAcceptDrops(true);
1663 }
1664
1665
1666 #if QT_VERSION < 0x040300
1667 int DragTabBar::tabAt(QPoint const & position) const
1668 {
1669         const int max = count();
1670         for (int i = 0; i < max; ++i) {
1671                 if (tabRect(i).contains(position))
1672                         return i;
1673         }
1674         return -1;
1675 }
1676 #endif
1677
1678
1679 void DragTabBar::mousePressEvent(QMouseEvent * event)
1680 {
1681         if (event->button() == Qt::LeftButton)
1682                 dragStartPos_ = event->pos();
1683         QTabBar::mousePressEvent(event);
1684 }
1685
1686
1687 void DragTabBar::mouseMoveEvent(QMouseEvent * event)
1688 {
1689         // If the left button isn't pressed anymore then return
1690         if (!(event->buttons() & Qt::LeftButton))
1691                 return;
1692
1693         // If the distance is too small then return
1694         if ((event->pos() - dragStartPos_).manhattanLength()
1695             < QApplication::startDragDistance())
1696                 return;
1697
1698         // did we hit something after all?
1699         int tab = tabAt(dragStartPos_);
1700         if (tab == -1)
1701                 return;
1702
1703         // simulate button release to remove highlight from button
1704         int i = currentIndex();
1705         QMouseEvent me(QEvent::MouseButtonRelease, dragStartPos_,
1706                 event->button(), event->buttons(), 0);
1707         QTabBar::mouseReleaseEvent(&me);
1708         setCurrentIndex(i);
1709
1710         // initiate Drag
1711         QDrag * drag = new QDrag(this);
1712         QMimeData * mimeData = new QMimeData;
1713         // a crude way to distinguish tab-reodering drops from other ones
1714         mimeData->setData("action", "tab-reordering") ;
1715         drag->setMimeData(mimeData);
1716
1717 #if QT_VERSION >= 0x040300
1718         // get tab pixmap as cursor
1719         QRect r = tabRect(tab);
1720         QPixmap pixmap(r.size());
1721         render(&pixmap, - r.topLeft());
1722         drag->setPixmap(pixmap);
1723         drag->exec();
1724 #else
1725         drag->start(Qt::MoveAction);
1726 #endif
1727
1728 }
1729
1730
1731 void DragTabBar::dragEnterEvent(QDragEnterEvent * event)
1732 {
1733         // Only accept if it's an tab-reordering request
1734         QMimeData const * m = event->mimeData();
1735         QStringList formats = m->formats();
1736         if (formats.contains("action")
1737             && m->data("action") == "tab-reordering")
1738                 event->acceptProposedAction();
1739 }
1740
1741
1742 void DragTabBar::dropEvent(QDropEvent * event)
1743 {
1744         int fromIndex = tabAt(dragStartPos_);
1745         int toIndex = tabAt(event->pos());
1746
1747         // Tell interested objects that
1748         if (fromIndex != toIndex)
1749                 tabMoveRequested(fromIndex, toIndex);
1750         event->acceptProposedAction();
1751 }
1752
1753
1754 } // namespace frontend
1755 } // namespace lyx
1756
1757 #include "GuiWorkArea_moc.cpp"