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