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 #include "GuiWorkArea_Private.h"
  16
  17 #include "ColorCache.h"
  18 #include "FontLoader.h"
  19 #include "Menus.h"
  20
  21 #include "Buffer.h"
  22 #include "BufferList.h"
  23 #include "BufferParams.h"
  24 #include "BufferView.h"
  25 #include "CoordCache.h"
  26 #include "Cursor.h"
  27 #include "Font.h"
  28 #include "FuncRequest.h"
  29 #include "GuiApplication.h"
  30 #include "GuiCompleter.h"
  31 #include "GuiKeySymbol.h"
  32 #include "GuiPainter.h"
  33 #include "GuiView.h"
  34 #include "KeySymbol.h"
  35 #include "Language.h"
  36 #include "LyX.h"
  37 #include "LyXRC.h"
  38 #include "LyXVC.h"
  39 #include "qt_helpers.h"
  40 #include "Text.h"
  41 #include "TextMetrics.h"
  42 #include "version.h"
  43
  44 #include "graphics/GraphicsImage.h"
  45 #include "graphics/GraphicsLoader.h"
  46
  47 #include "support/convert.h"
  48 #include "support/debug.h"
  49 #include "support/gettext.h"
  50 #include "support/FileName.h"
  51 #include "support/lassert.h"
  52
  53 #include "frontends/Application.h"
  54 #include "frontends/FontMetrics.h"
  55 #include "frontends/WorkAreaManager.h"
  56
  57 #include <QContextMenuEvent>
  58 #include <QInputContext>
  59 #include <QHelpEvent>
  60 #ifdef Q_WS_MACX
  61 #include <QMacStyle>
  62 #endif
  63 #include <QMainWindow>
  64 #include <QMenu>
  65 #include <QPainter>
  66 #include <QPalette>
  67 #include <QPixmapCache>
  68 #include <QScrollBar>
  69 #include <QTimer>
  70 #include <QToolButton>
  71 #include <QToolTip>
  72 #include <QMenuBar>
  73
  74 #include "support/bind.h"
  75
  76 #include <cmath>
  77
  78 int const TabIndicatorWidth = 3;
  79
  80 #undef KeyPress
  81 #undef NoModifier
  82
  83 using namespace std;
  84 using namespace lyx::support;
  85
  86 namespace lyx {
  87
  88
  89 /// return the LyX mouse button state from Qt's
  90 static mouse_button::state q_button_state(Qt::MouseButton button)
  91 {
  92         mouse_button::state b = mouse_button::none;
  93         switch (button) {
  94                 case Qt::LeftButton:
  95                         b = mouse_button::button1;
  96                         break;
  97                 case Qt::MidButton:
  98                         b = mouse_button::button2;
  99                         break;
 100                 case Qt::RightButton:
 101                         b = mouse_button::button3;
 102                         break;
 103                 default:
 104                         break;
 105         }
 106         return b;
 107 }
 108
 109
 110 /// return the LyX mouse button state from Qt's
 111 mouse_button::state q_motion_state(Qt::MouseButtons state)
 112 {
 113         mouse_button::state b = mouse_button::none;
 114         if (state & Qt::LeftButton)
 115                 b |= mouse_button::button1;
 116         if (state & Qt::MidButton)
 117                 b |= mouse_button::button2;
 118         if (state & Qt::RightButton)
 119                 b |= mouse_button::button3;
 120         return b;
 121 }
 122
 123
 124 namespace frontend {
 125
 126 class CursorWidget {
 127 public:
 128         CursorWidget() {
 129                 recomputeWidth();
 130         }
 131
 132         void draw(QPainter & painter)
 133         {
 134                 if (!show_ || !rect_.isValid())
 135                         return;
 136
 137                 int y = rect_.top();
 138                 int l = x_ - rect_.left();
 139                 int r = rect_.right() - x_;
 140                 int bot = rect_.bottom();
 141
 142                 // draw vertical line
 143                 painter.fillRect(x_, y, cursor_width_, rect_.height(), color_);
 144
 145                 // draw RTL/LTR indication
 146                 painter.setPen(color_);
 147                 if (l_shape_) {
 148                         if (rtl_)
 149                                 painter.drawLine(x_, bot, x_ - l, bot);
 150                         else
 151                                 painter.drawLine(x_, bot, x_ + cursor_width_ + r, bot);
 152                 }
 153
 154                 // draw completion triangle
 155                 if (completable_) {
 156                         int m = y + rect_.height() / 2;
 157                         int d = TabIndicatorWidth - 1;
 158                         if (rtl_) {
 159                                 painter.drawLine(x_ - 1, m - d, x_ - 1 - d, m);
 160                                 painter.drawLine(x_ - 1, m + d, x_ - 1 - d, m);
 161                         } else {
 162                                 painter.drawLine(x_ + cursor_width_, m - d, x_ + cursor_width_ + d, m);
 163                                 painter.drawLine(x_ + cursor_width_, m + d, x_ + cursor_width_ + d, m);
 164                         }
 165                 }
 166         }
 167
 168         void update(int x, int y, int h, bool l_shape,
 169                 bool rtl, bool completable)
 170         {
 171                 color_ = guiApp->colorCache().get(Color_cursor);
 172                 l_shape_ = l_shape;
 173                 rtl_ = rtl;
 174                 completable_ = completable;
 175                 x_ = x;
 176
 177                 // extension to left and right
 178                 int l = 0;
 179                 int r = 0;
 180
 181                 // RTL/LTR indication
 182                 if (l_shape_) {
 183                         if (rtl)
 184                                 l += h / 3;
 185                         else
 186                                 r += h / 3;
 187                 }
 188
 189                 // completion triangle
 190                 if (completable_) {
 191                         if (rtl)
 192                                 l = max(l, TabIndicatorWidth);
 193                         else
 194                                 r = max(r, TabIndicatorWidth);
 195                 }
 196
 197                 // compute overall rectangle
 198                 rect_ = QRect(x - l, y, cursor_width_ + r + l, h);
 199         }
 200
 201         void show(bool set_show = true) { show_ = set_show; }
 202         void hide() { show_ = false; }
 203         int cursorWidth() const { return cursor_width_; }
 204         void recomputeWidth() {
 205                 cursor_width_ = lyxrc.cursor_width
 206                         ? lyxrc.cursor_width
 207                         : 1 + int((lyxrc.zoom + 50) / 200.0);
 208         }
 209
 210         QRect const & rect() { return rect_; }
 211
 212 private:
 213         /// cursor is in RTL or LTR text
 214         bool rtl_;
 215         /// indication for RTL or LTR
 216         bool l_shape_;
 217         /// triangle to show that a completion is available
 218         bool completable_;
 219         ///
 220         bool show_;
 221         ///
 222         QColor color_;
 223         /// rectangle, possibly with l_shape and completion triangle
 224         QRect rect_;
 225         /// x position (were the vertical line is drawn)
 226         int x_;
 227
 228         int cursor_width_;
 229 };
 230
 231
 232 // This is a 'heartbeat' generating synthetic mouse move events when the
 233 // cursor is at the top or bottom edge of the viewport. One scroll per 0.2 s
 234 SyntheticMouseEvent::SyntheticMouseEvent()
 235         : timeout(200), restart_timeout(true)
 236 {}
 237
 238
 239 GuiWorkArea::Private::Private(GuiWorkArea * parent)
 240 : p(parent), buffer_view_(0), lyx_view_(0), cursor_visible_(false),
 241 need_resize_(false), schedule_redraw_(false), preedit_lines_(1),
 242 completer_(new GuiCompleter(p, p))
 243 {
 244 }
 245
 246
 247 GuiWorkArea::GuiWorkArea(QWidget * /* w */)
 248 : d(new Private(this))
 249 {
 250 }
 251
 252
 253 GuiWorkArea::GuiWorkArea(Buffer & buffer, GuiView & gv)
 254 : d(new Private(this))
 255 {
 256         setGuiView(gv);
 257         setBuffer(buffer);
 258         init();
 259 }
 260
 261
 262 void GuiWorkArea::init()
 263 {
 264         // Setup the signals
 265         connect(&d->cursor_timeout_, SIGNAL(timeout()),
 266                 this, SLOT(toggleCursor()));
 267
 268         int const time = QApplication::cursorFlashTime() / 2;
 269         if (time > 0) {
 270                 d->cursor_timeout_.setInterval(time);
 271                 d->cursor_timeout_.start();
 272         } else {
 273                 // let's initialize this just to be safe
 274                 d->cursor_timeout_.setInterval(500);
 275         }
 276
 277         d->resetScreen();
 278         // With Qt4.5 a mouse event will happen before the first paint event
 279         // so make sure that the buffer view has an up to date metrics.
 280         d->buffer_view_->resize(viewport()->width(), viewport()->height());
 281         d->cursor_ = new frontend::CursorWidget();
 282         d->cursor_->hide();
 283
 284         setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 285         setAcceptDrops(true);
 286         setMouseTracking(true);
 287         setMinimumSize(100, 70);
 288         setFrameStyle(QFrame::NoFrame);
 289         updateWindowTitle();
 290
 291         viewport()->setAutoFillBackground(false);
 292         // We don't need double-buffering nor SystemBackground on
 293         // the viewport because we have our own backing pixmap.
 294         viewport()->setAttribute(Qt::WA_NoSystemBackground);
 295
 296         setFocusPolicy(Qt::StrongFocus);
 297
 298         d->setCursorShape(Qt::IBeamCursor);
 299
 300         d->synthetic_mouse_event_.timeout.timeout.connect(
 301                 bind(&GuiWorkArea::generateSyntheticMouseEvent,
 302                                         this));
 303
 304         // Initialize the vertical Scroll Bar
 305         QObject::connect(verticalScrollBar(), SIGNAL(valueChanged(int)),
 306                 this, SLOT(scrollTo(int)));
 307
 308         LYXERR(Debug::GUI, "viewport width: " << viewport()->width()
 309                 << "  viewport height: " << viewport()->height());
 310
 311         // Enables input methods for asian languages.
 312         // Must be set when creating custom text editing widgets.
 313         setAttribute(Qt::WA_InputMethodEnabled, true);
 314
 315         d->dialog_mode_ = false;
 316 }
 317
 318
 319 GuiWorkArea::~GuiWorkArea()
 320 {
 321         d->buffer_view_->buffer().workAreaManager().remove(this);
 322         delete d->buffer_view_;
 323         delete d->cursor_;
 324         // Completer has a QObject parent and is thus automatically destroyed.
 325         // See #4758.
 326         // delete completer_;
 327         delete d;
 328 }
 329
 330
 331 Qt::CursorShape GuiWorkArea::cursorShape() const
 332 {
 333         return viewport()->cursor().shape();
 334 }
 335
 336
 337 void GuiWorkArea::Private::setCursorShape(Qt::CursorShape shape)
 338 {
 339         p->viewport()->setCursor(shape);
 340 }
 341
 342
 343 void GuiWorkArea::Private::updateCursorShape()
 344 {
 345         setCursorShape(buffer_view_->clickableInset()
 346                 ? Qt::PointingHandCursor : Qt::IBeamCursor);
 347 }
 348
 349
 350 void GuiWorkArea::setGuiView(GuiView & gv)
 351 {
 352         d->lyx_view_ = &gv;
 353 }
 354
 355
 356 void GuiWorkArea::setBuffer(Buffer & buffer)
 357 {
 358         delete d->buffer_view_;
 359         d->buffer_view_ = new BufferView(buffer);
 360         buffer.workAreaManager().add(this);
 361
 362         // HACK: Prevents an additional redraw when the scrollbar pops up
 363         // which regularily happens on documents with more than one page.
 364         // The policy  should be set to "Qt::ScrollBarAsNeeded" soon.
 365         // Since we have no geometry information yet, we assume that
 366         // a document needs a scrollbar if there is more then four
 367         // paragraph in the outermost text.
 368         if (buffer.text().paragraphs().size() > 4)
 369                 setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
 370         QTimer::singleShot(50, this, SLOT(fixVerticalScrollBar()));
 371 }
 372
 373
 374 void GuiWorkArea::fixVerticalScrollBar()
 375 {
 376         if (!isFullScreen())
 377                 setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
 378 }
 379
 380
 381 void GuiWorkArea::close()
 382 {
 383         d->lyx_view_->removeWorkArea(this);
 384 }
 385
 386
 387 void GuiWorkArea::setFullScreen(bool full_screen)
 388 {
 389         d->buffer_view_->setFullScreen(full_screen);
 390         setFrameStyle(QFrame::NoFrame);
 391         if (full_screen) {
 392                 setFrameStyle(QFrame::NoFrame);
 393                 if (lyxrc.full_screen_scrollbar)
 394                         setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 395         } else
 396                 setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
 397 }
 398
 399
 400 BufferView & GuiWorkArea::bufferView()
 401 {
 402         return *d->buffer_view_;
 403 }
 404
 405
 406 BufferView const & GuiWorkArea::bufferView() const
 407 {
 408         return *d->buffer_view_;
 409 }
 410
 411
 412 void GuiWorkArea::stopBlinkingCursor()
 413 {
 414         d->cursor_timeout_.stop();
 415         d->hideCursor();
 416 }
 417
 418
 419 void GuiWorkArea::startBlinkingCursor()
 420 {
 421         // do not show the cursor if the view is busy
 422         if (view().busy())
 423                 return;
 424
 425         Point p;
 426         int h = 0;
 427         d->buffer_view_->cursorPosAndHeight(p, h);
 428         // Don't start blinking if the cursor isn't on screen.
 429         if (!d->buffer_view_->cursorInView(p, h))
 430                 return;
 431
 432         d->showCursor();
 433
 434         //we're not supposed to cache this value.
 435         int const time = QApplication::cursorFlashTime() / 2;
 436         if (time <= 0)
 437                 return;
 438         d->cursor_timeout_.setInterval(time);
 439         d->cursor_timeout_.start();
 440 }
 441
 442
 443 void GuiWorkArea::redraw(bool update_metrics)
 444 {
 445         if (!isVisible())
 446                 // No need to redraw in this case.
 447                 return;
 448
 449         // No need to do anything if this is the current view. The BufferView
 450         // metrics are already up to date.
 451         if (update_metrics || d->lyx_view_ != guiApp->currentView()
 452                 || d->lyx_view_->currentWorkArea() != this) {
 453                 // FIXME: it would be nice to optimize for the off-screen case.
 454                 d->buffer_view_->cursor().fixIfBroken();
 455                 d->buffer_view_->updateMetrics();
 456                 d->buffer_view_->cursor().fixIfBroken();
 457         }
 458
 459         // update cursor position, because otherwise it has to wait until
 460         // the blinking interval is over
 461         if (d->cursor_visible_) {
 462                 d->hideCursor();
 463                 d->showCursor();
 464         }
 465
 466         LYXERR(Debug::WORKAREA, "WorkArea::redraw screen");
 467         d->updateScreen();
 468         update(0, 0, viewport()->width(), viewport()->height());
 469
 470         /// \warning: scrollbar updating *must* be done after the BufferView is drawn
 471         /// because \c BufferView::updateScrollbar() is called in \c BufferView::draw().
 472         d->updateScrollbar();
 473         d->lyx_view_->updateStatusBar();
 474
 475         if (lyxerr.debugging(Debug::WORKAREA))
 476                 d->buffer_view_->coordCache().dump();
 477
 478         updateWindowTitle();
 479
 480         d->updateCursorShape();
 481 }
 482
 483
 484 void GuiWorkArea::processKeySym(KeySymbol const & key, KeyModifier mod)
 485 {
 486         if (d->lyx_view_->isFullScreen() && d->lyx_view_->menuBar()->isVisible()
 487                 && lyxrc.full_screen_menubar) {
 488                 // FIXME HACK: we should not have to do this here. See related comment
 489                 // in GuiView::event() (QEvent::ShortcutOverride)
 490                 d->lyx_view_->menuBar()->hide();
 491         }
 492
 493         // In order to avoid bad surprise in the middle of an operation,
 494         // we better stop the blinking cursor...
 495         // the cursor gets restarted in GuiView::restartCursor()
 496         stopBlinkingCursor();
 497         guiApp->processKeySym(key, mod);
 498 }
 499
 500
 501 void GuiWorkArea::Private::dispatch(FuncRequest const & cmd0, KeyModifier mod)
 502 {
 503         // Handle drag&drop
 504         if (cmd0.action() == LFUN_FILE_OPEN) {
 505                 DispatchResult dr;
 506                 lyx_view_->dispatch(cmd0, dr);
 507                 return;
 508         }
 509
 510         FuncRequest cmd;
 511
 512         if (cmd0.action() == LFUN_MOUSE_PRESS) {
 513                 if (mod == ShiftModifier)
 514                         cmd = FuncRequest(cmd0, "region-select");
 515                 else if (mod == ControlModifier)
 516                         cmd = FuncRequest(cmd0, "paragraph-select");
 517                 else
 518                         cmd = cmd0;
 519         }
 520         else
 521                 cmd = cmd0;
 522
 523         bool const notJustMovingTheMouse =
 524                 cmd.action() != LFUN_MOUSE_MOTION || cmd.button() != mouse_button::none;
 525
 526         // In order to avoid bad surprise in the middle of an operation, we better stop
 527         // the blinking cursor.
 528         if (notJustMovingTheMouse)
 529                 p->stopBlinkingCursor();
 530
 531         buffer_view_->mouseEventDispatch(cmd);
 532
 533         // Skip these when selecting
 534         if (cmd.action() != LFUN_MOUSE_MOTION) {
 535                 completer_->updateVisibility(false, false);
 536                 lyx_view_->updateDialogs();
 537                 lyx_view_->updateStatusBar();
 538         }
 539
 540         // GUI tweaks except with mouse motion with no button pressed.
 541         if (notJustMovingTheMouse) {
 542                 // Slight hack: this is only called currently when we
 543                 // clicked somewhere, so we force through the display
 544                 // of the new status here.
 545                 lyx_view_->clearMessage();
 546
 547                 // Show the cursor immediately after any operation
 548                 p->startBlinkingCursor();
 549         }
 550
 551         updateCursorShape();
 552 }
 553
 554
 555 void GuiWorkArea::Private::resizeBufferView()
 556 {
 557         // WARNING: Please don't put any code that will trigger a repaint here!
 558         // We are already inside a paint event.
 559         lyx_view_->setBusy(true);
 560         Point point;
 561         int h = 0;
 562         buffer_view_->cursorPosAndHeight(point, h);
 563         bool const cursor_in_view = buffer_view_->cursorInView(point, h);
 564         buffer_view_->resize(p->viewport()->width(), p->viewport()->height());
 565         if (cursor_in_view)
 566                 buffer_view_->scrollToCursor();
 567         updateScreen();
 568
 569         // Update scrollbars which might have changed due different
 570         // BufferView dimension. This is especially important when the
 571         // BufferView goes from zero-size to the real-size for the first time,
 572         // as the scrollbar paramters are then set for the first time.
 573         updateScrollbar();
 574
 575         lyx_view_->updateLayoutList();
 576         lyx_view_->setBusy(false);
 577         need_resize_ = false;
 578 }
 579
 580
 581 void GuiWorkArea::Private::showCursor()
 582 {
 583         if (cursor_visible_)
 584                 return;
 585
 586         Point p;
 587         int h = 0;
 588         buffer_view_->cursorPosAndHeight(p, h);
 589         if (!buffer_view_->cursorInView(p, h))
 590                 return;
 591
 592         // RTL or not RTL
 593         bool l_shape = false;
 594         Font const & realfont = buffer_view_->cursor().real_current_font;
 595         BufferParams const & bp = buffer_view_->buffer().params();
 596         bool const samelang = realfont.language() == bp.language;
 597         bool const isrtl = realfont.isVisibleRightToLeft();
 598
 599         if (!samelang || isrtl != bp.language->rightToLeft())
 600                 l_shape = true;
 601
 602         // The ERT language hack needs fixing up
 603         if (realfont.language() == latex_language)
 604                 l_shape = false;
 605
 606         // show cursor on screen
 607         Cursor & cur = buffer_view_->cursor();
 608         bool completable = cur.inset().showCompletionCursor()
 609                 && completer_->completionAvailable()
 610                 && !completer_->popupVisible()
 611                 && !completer_->inlineVisible();
 612         cursor_visible_ = true;
 613         cursor_->recomputeWidth();
 614         showCursor(p.x_, p.y_, h, l_shape, isrtl, completable);
 615 }
 616
 617
 618 void GuiWorkArea::Private::hideCursor()
 619 {
 620         if (!cursor_visible_)
 621                 return;
 622
 623         cursor_visible_ = false;
 624         removeCursor();
 625 }
 626
 627
 628 void GuiWorkArea::toggleCursor()
 629 {
 630         if (d->cursor_visible_)
 631                 d->hideCursor();
 632         else
 633                 d->showCursor();
 634 }
 635
 636
 637 void GuiWorkArea::Private::updateScrollbar()
 638 {
 639         ScrollbarParameters const & scroll_ = buffer_view_->scrollbarParameters();
 640         // WARNING: don't touch at the scrollbar value like this:
 641         //   verticalScrollBar()->setValue(scroll_.position);
 642         // because this would cause a recursive signal/slot calling with
 643         // GuiWorkArea::scrollTo
 644         p->verticalScrollBar()->setRange(scroll_.min, scroll_.max);
 645         p->verticalScrollBar()->setPageStep(scroll_.page_step);
 646         p->verticalScrollBar()->setSingleStep(scroll_.single_step);
 647         p->verticalScrollBar()->setSliderPosition(scroll_.position);
 648 }
 649
 650
 651 void GuiWorkArea::scrollTo(int value)
 652 {
 653         stopBlinkingCursor();
 654         d->buffer_view_->scrollDocView(value, true);
 655
 656         if (lyxrc.cursor_follows_scrollbar) {
 657                 d->buffer_view_->setCursorFromScrollbar();
 658                 d->lyx_view_->updateLayoutList();
 659         }
 660         // Show the cursor immediately after any operation.
 661         startBlinkingCursor();
 662         QApplication::syncX();
 663 }
 664
 665
 666 bool GuiWorkArea::event(QEvent * e)
 667 {
 668         switch (e->type()) {
 669         case QEvent::ToolTip: {
 670                 QHelpEvent * helpEvent = static_cast<QHelpEvent *>(e);
 671                 if (lyxrc.use_tooltip) {
 672                         QPoint pos = helpEvent->pos();
 673                         if (pos.x() < viewport()->width()) {
 674                                 QString s = toqstr(d->buffer_view_->toolTip(pos.x(), pos.y()));
 675                                 QToolTip::showText(helpEvent->globalPos(), s);
 676                         }
 677                         else
 678                                 QToolTip::hideText();
 679                 }
 680                 // Don't forget to accept the event!
 681                 e->accept();
 682                 return true;
 683         }
 684
 685         case QEvent::ShortcutOverride: {
 686                 // We catch this event in order to catch the Tab or Shift+Tab key press
 687                 // which are otherwise reserved to focus switching between controls
 688                 // within a dialog.
 689                 QKeyEvent * ke = static_cast<QKeyEvent*>(e);
 690                 if ((ke->key() == Qt::Key_Tab && ke->modifiers() == Qt::NoModifier)
 691                         || (ke->key() == Qt::Key_Backtab && (
 692                                 ke->modifiers() == Qt::ShiftModifier
 693                                 || ke->modifiers() == Qt::NoModifier))) {
 694                         keyPressEvent(ke);
 695                         return true;
 696                 }
 697                 return QAbstractScrollArea::event(e);
 698         }
 699
 700         default:
 701                 return QAbstractScrollArea::event(e);
 702         }
 703         return false;
 704 }
 705
 706
 707 void GuiWorkArea::contextMenuEvent(QContextMenuEvent * e)
 708 {
 709         docstring name;
 710         if (e->reason() == QContextMenuEvent::Mouse)
 711                 // the menu name is set on mouse press
 712                 name = d->context_menu_name_;
 713         else {
 714                 QPoint pos = e->pos();
 715                 Cursor const & cur = d->buffer_view_->cursor();
 716                 if (e->reason() == QContextMenuEvent::Keyboard && cur.inTexted()) {
 717                         // Do not access the context menu of math right in front of before
 718                         // the cursor. This does not work when the cursor is in text.
 719                         Inset * inset = cur.paragraph().getInset(cur.pos());
 720                         if (inset && inset->asInsetMath())
 721                                 --pos.rx();
 722                         else if (cur.pos() > 0) {
 723                                 Inset * inset = cur.paragraph().getInset(cur.pos() - 1);
 724                                 if (inset)
 725                                         ++pos.rx();
 726                         }
 727                 }
 728                 name = d->buffer_view_->contextMenu(pos.x(), pos.y());
 729         }
 730
 731         if (name.empty()) {
 732                 QAbstractScrollArea::contextMenuEvent(e);
 733                 return;
 734         }
 735         // always show mnemonics when the keyboard is used to show the context menu
 736         // FIXME: This should be fixed in Qt itself
 737         bool const keyboard = (e->reason() == QContextMenuEvent::Keyboard);
 738         QMenu * menu = guiApp->menus().menu(toqstr(name), *d->lyx_view_, keyboard);
 739         if (!menu) {
 740                 QAbstractScrollArea::contextMenuEvent(e);
 741                 return;
 742         }
 743         // Position the menu to the right.
 744         // FIXME: menu position should be different for RTL text.
 745         menu->exec(e->globalPos());
 746         e->accept();
 747 }
 748
 749
 750 void GuiWorkArea::focusInEvent(QFocusEvent * e)
 751 {
 752         LYXERR(Debug::DEBUG, "GuiWorkArea::focusInEvent(): " << this << endl);
 753         if (d->lyx_view_->currentWorkArea() != this)
 754                 d->lyx_view_->setCurrentWorkArea(this);
 755
 756         startBlinkingCursor();
 757         QAbstractScrollArea::focusInEvent(e);
 758 }
 759
 760
 761 void GuiWorkArea::focusOutEvent(QFocusEvent * e)
 762 {
 763         LYXERR(Debug::DEBUG, "GuiWorkArea::focusOutEvent(): " << this << endl);
 764         stopBlinkingCursor();
 765         QAbstractScrollArea::focusOutEvent(e);
 766 }
 767
 768
 769 void GuiWorkArea::mousePressEvent(QMouseEvent * e)
 770 {
 771         if (d->dc_event_.active && d->dc_event_ == *e) {
 772                 d->dc_event_.active = false;
 773                 FuncRequest cmd(LFUN_MOUSE_TRIPLE, e->x(), e->y(),
 774                         q_button_state(e->button()));
 775                 d->dispatch(cmd);
 776                 e->accept();
 777                 return;
 778         }
 779
 780         inputContext()->reset();
 781
 782         FuncRequest const cmd(LFUN_MOUSE_PRESS, e->x(), e->y(),
 783                 q_button_state(e->button()));
 784         d->dispatch(cmd, q_key_state(e->modifiers()));
 785
 786         // Save the context menu on mouse press, because also the mouse
 787         // cursor is set on mouse press. Afterwards, we can either release
 788         // the mousebutton somewhere else, or the cursor might have moved
 789         // due to the DEPM. We need to do this after the mouse has been
 790         // set in dispatch(), because the selection state might change.
 791         if (e->button() == Qt::RightButton)
 792                 d->context_menu_name_ = d->buffer_view_->contextMenu(e->x(), e->y());
 793
 794         e->accept();
 795 }
 796
 797
 798 void GuiWorkArea::mouseReleaseEvent(QMouseEvent * e)
 799 {
 800         if (d->synthetic_mouse_event_.timeout.running())
 801                 d->synthetic_mouse_event_.timeout.stop();
 802
 803         FuncRequest const cmd(LFUN_MOUSE_RELEASE, e->x(), e->y(),
 804                               q_button_state(e->button()));
 805         d->dispatch(cmd);
 806         e->accept();
 807 }
 808
 809
 810 void GuiWorkArea::mouseMoveEvent(QMouseEvent * e)
 811 {
 812         // we kill the triple click if we move
 813         doubleClickTimeout();
 814         FuncRequest cmd(LFUN_MOUSE_MOTION, e->x(), e->y(),
 815                 q_motion_state(e->buttons()));
 816
 817         e->accept();
 818
 819         // If we're above or below the work area...
 820         if ((e->y() <= 20 || e->y() >= viewport()->height() - 20)
 821                         && e->buttons() == mouse_button::button1) {
 822                 // Make sure only a synthetic event can cause a page scroll,
 823                 // so they come at a steady rate:
 824                 if (e->y() <= 20)
 825                         // _Force_ a scroll up:
 826                         cmd.set_y(e->y() - 21);
 827                 else
 828                         cmd.set_y(e->y() + 21);
 829                 // Store the event, to be handled when the timeout expires.
 830                 d->synthetic_mouse_event_.cmd = cmd;
 831
 832                 if (d->synthetic_mouse_event_.timeout.running()) {
 833                         // Discard the event. Note that it _may_ be handled
 834                         // when the timeout expires if
 835                         // synthetic_mouse_event_.cmd has not been overwritten.
 836                         // Ie, when the timeout expires, we handle the
 837                         // most recent event but discard all others that
 838                         // occurred after the one used to start the timeout
 839                         // in the first place.
 840                         return;
 841                 }
 842
 843                 d->synthetic_mouse_event_.restart_timeout = true;
 844                 d->synthetic_mouse_event_.timeout.start();
 845                 // Fall through to handle this event...
 846
 847         } else if (d->synthetic_mouse_event_.timeout.running()) {
 848                 // Store the event, to be possibly handled when the timeout
 849                 // expires.
 850                 // Once the timeout has expired, normal control is returned
 851                 // to mouseMoveEvent (restart_timeout = false).
 852                 // This results in a much smoother 'feel' when moving the
 853                 // mouse back into the work area.
 854                 d->synthetic_mouse_event_.cmd = cmd;
 855                 d->synthetic_mouse_event_.restart_timeout = false;
 856                 return;
 857         }
 858         d->dispatch(cmd);
 859 }
 860
 861
 862 void GuiWorkArea::wheelEvent(QWheelEvent * ev)
 863 {
 864         // Wheel rotation by one notch results in a delta() of 120 (see
 865         // documentation of QWheelEvent)
 866         double const delta = ev->delta() / 120.0;
 867         bool zoom = false;
 868         switch (lyxrc.scroll_wheel_zoom) {
 869         case LyXRC::SCROLL_WHEEL_ZOOM_CTRL:
 870                 zoom = ev->modifiers() & Qt::ControlModifier;
 871                 zoom &= !(ev->modifiers() & (Qt::ShiftModifier | Qt::AltModifier));
 872                 break;
 873         case LyXRC::SCROLL_WHEEL_ZOOM_SHIFT:
 874                 zoom = ev->modifiers() & Qt::ShiftModifier;
 875                 zoom &= !(ev->modifiers() & (Qt::ControlModifier | Qt::AltModifier));
 876                 break;
 877         case LyXRC::SCROLL_WHEEL_ZOOM_ALT:
 878                 zoom = ev->modifiers() & Qt::AltModifier;
 879                 zoom &= !(ev->modifiers() & (Qt::ShiftModifier | Qt::ControlModifier));
 880                 break;
 881         case LyXRC::SCROLL_WHEEL_ZOOM_OFF:
 882                 break;
 883         }
 884         if (zoom) {
 885                 docstring arg = convert<docstring>(int(5 * delta));
 886                 lyx::dispatch(FuncRequest(LFUN_BUFFER_ZOOM_IN, arg));
 887                 return;
 888         }
 889
 890         // Take into account the desktop wide settings.
 891         int const lines = qApp->wheelScrollLines();
 892         int const page_step = verticalScrollBar()->pageStep();
 893         // Test if the wheel mouse is set to one screen at a time.
 894         int scroll_value = lines > page_step
 895                 ? page_step : lines * verticalScrollBar()->singleStep();
 896
 897         // Take into account the rotation and the user preferences.
 898         scroll_value = int(scroll_value * delta * lyxrc.mouse_wheel_speed);
 899         LYXERR(Debug::SCROLLING, "wheelScrollLines = " << lines
 900                         << " delta = " << delta << " scroll_value = " << scroll_value
 901                         << " page_step = " << page_step);
 902         // Now scroll.
 903         verticalScrollBar()->setValue(verticalScrollBar()->value() - scroll_value);
 904
 905         ev->accept();
 906 }
 907
 908
 909 void GuiWorkArea::generateSyntheticMouseEvent()
 910 {
 911         int const e_y = d->synthetic_mouse_event_.cmd.y();
 912         int const wh = d->buffer_view_->workHeight();
 913         bool const up = e_y < 0;
 914         bool const down = e_y > wh;
 915
 916         // Set things off to generate the _next_ 'pseudo' event.
 917         int step = 50;
 918         if (d->synthetic_mouse_event_.restart_timeout) {
 919                 // This is some magic formulae to determine the speed
 920                 // of scrolling related to the position of the mouse.
 921                 int time = 200;
 922                 if (up || down) {
 923                         int dist = up ? -e_y : e_y - wh;
 924                         time = max(min(200, 250000 / (dist * dist)), 1) ;
 925
 926                         if (time < 40) {
 927                                 step = 80000 / (time * time);
 928                                 time = 40;
 929                         }
 930                 }
 931                 d->synthetic_mouse_event_.timeout.setTimeout(time);
 932                 d->synthetic_mouse_event_.timeout.start();
 933         }
 934
 935         // Can we scroll further ?
 936         int const value = verticalScrollBar()->value();
 937         if (value == verticalScrollBar()->maximum()
 938                   || value == verticalScrollBar()->minimum()) {
 939                 d->synthetic_mouse_event_.timeout.stop();
 940                 return;
 941         }
 942
 943         // Scroll
 944         if (step <= 2 * wh) {
 945                 d->buffer_view_->scroll(up ? -step : step);
 946                 d->buffer_view_->updateMetrics();
 947         } else {
 948                 d->buffer_view_->scrollDocView(value + up ? -step : step, false);
 949         }
 950
 951         // In which paragraph do we have to set the cursor ?
 952         Cursor & cur = d->buffer_view_->cursor();
 953         // FIXME: we don't know howto handle math.
 954         Text * text = cur.text();
 955         if (!text)
 956                 return;
 957         TextMetrics const & tm = d->buffer_view_->textMetrics(text);
 958
 959         pair<pit_type, const ParagraphMetrics *> pp = up ? tm.first() : tm.last();
 960         ParagraphMetrics const & pm = *pp.second;
 961         pit_type const pit = pp.first;
 962
 963         if (pm.rows().empty())
 964                 return;
 965
 966         // Find the row at which we set the cursor.
 967         RowList::const_iterator rit = pm.rows().begin();
 968         RowList::const_iterator rlast = pm.rows().end();
 969         int yy = pm.position() - pm.ascent();
 970         for (--rlast; rit != rlast; ++rit) {
 971                 int h = rit->height();
 972                 if ((up && yy + h > 0)
 973                           || (!up && yy + h > wh - defaultRowHeight()))
 974                         break;
 975                 yy += h;
 976         }
 977
 978         // Find the position of the cursor
 979         bool bound;
 980         int x = d->synthetic_mouse_event_.cmd.x();
 981         pos_type const pos = rit->pos() + tm.getColumnNearX(pit, *rit, x, bound);
 982
 983         // Set the cursor
 984         cur.pit() = pit;
 985         cur.pos() = pos;
 986         cur.boundary(bound);
 987
 988         d->buffer_view_->buffer().changed(false);
 989         return;
 990 }
 991
 992
 993 void GuiWorkArea::keyPressEvent(QKeyEvent * ev)
 994 {
 995         // Do not process here some keys if dialog_mode_ is set
 996         if (d->dialog_mode_
 997                 && (ev->modifiers() == Qt::NoModifier
 998                     || ev->modifiers() == Qt::ShiftModifier)
 999                 && (ev->key() == Qt::Key_Escape
1000                     || ev->key() == Qt::Key_Enter
1001                     || ev->key() == Qt::Key_Return)
1002             ) {
1003                 ev->ignore();
1004                 return;
1005         }
1006
1007         // intercept some keys if completion popup is visible
1008         if (d->completer_->popupVisible()) {
1009                 switch (ev->key()) {
1010                 case Qt::Key_Enter:
1011                 case Qt::Key_Return:
1012                         d->completer_->activate();
1013                         ev->accept();
1014                         return;
1015                 }
1016         }
1017
1018         // do nothing if there are other events
1019         // (the auto repeated events come too fast)
1020         // it looks like this is only needed on X11
1021 #ifdef Q_WS_X11
1022         if (qApp->hasPendingEvents() && ev->isAutoRepeat()) {
1023                 switch (ev->key()) {
1024                 case Qt::Key_PageDown:
1025                 case Qt::Key_PageUp:
1026                 case Qt::Key_Left:
1027                 case Qt::Key_Right:
1028                 case Qt::Key_Up:
1029                 case Qt::Key_Down:
1030                         LYXERR(Debug::KEY, "system is busy: scroll key event ignored");
1031                         ev->ignore();
1032                         return;
1033                 }
1034         }
1035 #endif
1036
1037         KeyModifier m = q_key_state(ev->modifiers());
1038
1039         std::string str;
1040         if (m & ShiftModifier)
1041                 str += "Shift-";
1042         if (m & ControlModifier)
1043                 str += "Control-";
1044         if (m & AltModifier)
1045                 str += "Alt-";
1046         if (m & MetaModifier)
1047                 str += "Meta-";
1048
1049         LYXERR(Debug::KEY, " count: " << ev->count() << " text: " << ev->text()
1050                 << " isAutoRepeat: " << ev->isAutoRepeat() << " key: " << ev->key()
1051                 << " keyState: " << str);
1052
1053         KeySymbol sym;
1054         setKeySymbol(&sym, ev);
1055         if (sym.isOK()) {
1056                 processKeySym(sym, q_key_state(ev->modifiers()));
1057                 ev->accept();
1058         } else {
1059                 ev->ignore();
1060         }
1061 }
1062
1063
1064 void GuiWorkArea::doubleClickTimeout()
1065 {
1066         d->dc_event_.active = false;
1067 }
1068
1069
1070 void GuiWorkArea::mouseDoubleClickEvent(QMouseEvent * ev)
1071 {
1072         d->dc_event_ = DoubleClick(ev);
1073         QTimer::singleShot(QApplication::doubleClickInterval(), this,
1074                            SLOT(doubleClickTimeout()));
1075         FuncRequest cmd(LFUN_MOUSE_DOUBLE,
1076                         ev->x(), ev->y(),
1077                         q_button_state(ev->button()));
1078         d->dispatch(cmd);
1079         ev->accept();
1080 }
1081
1082
1083 void GuiWorkArea::resizeEvent(QResizeEvent * ev)
1084 {
1085         QAbstractScrollArea::resizeEvent(ev);
1086         d->need_resize_ = true;
1087         ev->accept();
1088 }
1089
1090
1091 void GuiWorkArea::Private::update(int x, int y, int w, int h)
1092 {
1093         p->viewport()->update(x, y, w, h);
1094 }
1095
1096
1097 void GuiWorkArea::paintEvent(QPaintEvent * ev)
1098 {
1099         QRect const rc = ev->rect();
1100         // LYXERR(Debug::PAINTING, "paintEvent begin: x: " << rc.x()
1101         //      << " y: " << rc.y() << " w: " << rc.width() << " h: " << rc.height());
1102
1103         if (d->need_resize_) {
1104                 d->resetScreen();
1105                 d->resizeBufferView();
1106                 if (d->cursor_visible_) {
1107                         d->hideCursor();
1108                         d->showCursor();
1109                 }
1110         }
1111
1112         QPainter pain(viewport());
1113 #ifdef USE_QIMAGE
1114         pain.drawImage(rc, d->screen_, rc);
1115 #else
1116         pain.drawPixmap(rc, d->screen_, rc);
1117 #endif
1118         d->cursor_->draw(pain);
1119         ev->accept();
1120 }
1121
1122
1123 void GuiWorkArea::Private::updateScreen()
1124 {
1125         GuiPainter pain(&screen_);
1126         buffer_view_->draw(pain);
1127 }
1128
1129
1130 void GuiWorkArea::Private::showCursor(int x, int y, int h,
1131         bool l_shape, bool rtl, bool completable)
1132 {
1133         if (schedule_redraw_) {
1134                 // This happens when a graphic conversion is finished. As we don't know
1135                 // the size of the new graphics, it's better the update everything.
1136                 // We can't use redraw() here because this would trigger a infinite
1137                 // recursive loop with showCursor().
1138                 buffer_view_->resize(p->viewport()->width(), p->viewport()->height());
1139                 updateScreen();
1140                 updateScrollbar();
1141                 p->viewport()->update(QRect(0, 0, p->viewport()->width(), p->viewport()->height()));
1142                 schedule_redraw_ = false;
1143                 // Show the cursor immediately after the update.
1144                 hideCursor();
1145                 p->toggleCursor();
1146                 return;
1147         }
1148
1149         cursor_->update(x, y, h, l_shape, rtl, completable);
1150         cursor_->show();
1151         p->viewport()->update(cursor_->rect());
1152 }
1153
1154
1155 void GuiWorkArea::Private::removeCursor()
1156 {
1157         cursor_->hide();
1158         //if (!qApp->focusWidget())
1159                 p->viewport()->update(cursor_->rect());
1160 }
1161
1162
1163 void GuiWorkArea::inputMethodEvent(QInputMethodEvent * e)
1164 {
1165         QString const & commit_string = e->commitString();
1166         docstring const & preedit_string
1167                 = qstring_to_ucs4(e->preeditString());
1168
1169         if (!commit_string.isEmpty()) {
1170
1171                 LYXERR(Debug::KEY, "preeditString: " << e->preeditString()
1172                         << " commitString: " << e->commitString());
1173
1174                 int key = 0;
1175
1176                 // FIXME Iwami 04/01/07: we should take care also of UTF16 surrogates here.
1177                 for (int i = 0; i != commit_string.size(); ++i) {
1178                         QKeyEvent ev(QEvent::KeyPress, key, Qt::NoModifier, commit_string[i]);
1179                         keyPressEvent(&ev);
1180                 }
1181         }
1182
1183         // Hide the cursor during the kana-kanji transformation.
1184         if (preedit_string.empty())
1185                 startBlinkingCursor();
1186         else
1187                 stopBlinkingCursor();
1188
1189         // last_width : for checking if last preedit string was/wasn't empty.
1190         static bool last_width = false;
1191         if (!last_width && preedit_string.empty()) {
1192                 // if last_width is last length of preedit string.
1193                 e->accept();
1194                 return;
1195         }
1196
1197         GuiPainter pain(&d->screen_);
1198         d->buffer_view_->updateMetrics();
1199         d->buffer_view_->draw(pain);
1200         FontInfo font = d->buffer_view_->cursor().getFont().fontInfo();
1201         FontMetrics const & fm = theFontMetrics(font);
1202         int height = fm.maxHeight();
1203         int cur_x = d->cursor_->rect().left();
1204         int cur_y = d->cursor_->rect().bottom();
1205
1206         // redraw area of preedit string.
1207         update(0, cur_y - height, viewport()->width(),
1208                 (height + 1) * d->preedit_lines_);
1209
1210         if (preedit_string.empty()) {
1211                 last_width = false;
1212                 d->preedit_lines_ = 1;
1213                 e->accept();
1214                 return;
1215         }
1216         last_width = true;
1217
1218         // att : stores an IM attribute.
1219         QList<QInputMethodEvent::Attribute> const & att = e->attributes();
1220
1221         // get attributes of input method cursor.
1222         // cursor_pos : cursor position in preedit string.
1223         size_t cursor_pos = 0;
1224         bool cursor_is_visible = false;
1225         for (int i = 0; i != att.size(); ++i) {
1226                 if (att.at(i).type == QInputMethodEvent::Cursor) {
1227                         cursor_pos = att.at(i).start;
1228                         cursor_is_visible = att.at(i).length != 0;
1229                         break;
1230                 }
1231         }
1232
1233         size_t preedit_length = preedit_string.length();
1234
1235         // get position of selection in input method.
1236         // FIXME: isn't there a way to do this simplier?
1237         // rStart : cursor position in selected string in IM.
1238         size_t rStart = 0;
1239         // rLength : selected string length in IM.
1240         size_t rLength = 0;
1241         if (cursor_pos < preedit_length) {
1242                 for (int i = 0; i != att.size(); ++i) {
1243                         if (att.at(i).type == QInputMethodEvent::TextFormat) {
1244                                 if (att.at(i).start <= int(cursor_pos)
1245                                         && int(cursor_pos) < att.at(i).start + att.at(i).length) {
1246                                                 rStart = att.at(i).start;
1247                                                 rLength = att.at(i).length;
1248                                                 if (!cursor_is_visible)
1249                                                         cursor_pos += rLength;
1250                                                 break;
1251                                 }
1252                         }
1253                 }
1254         }
1255         else {
1256                 rStart = cursor_pos;
1257                 rLength = 0;
1258         }
1259
1260         int const right_margin = d->buffer_view_->rightMargin();
1261         Painter::preedit_style ps;
1262         // Most often there would be only one line:
1263         d->preedit_lines_ = 1;
1264         for (size_t pos = 0; pos != preedit_length; ++pos) {
1265                 char_type const typed_char = preedit_string[pos];
1266                 // reset preedit string style
1267                 ps = Painter::preedit_default;
1268
1269                 // if we reached the right extremity of the screen, go to next line.
1270                 if (cur_x + fm.width(typed_char) > viewport()->width() - right_margin) {
1271                         cur_x = right_margin;
1272                         cur_y += height + 1;
1273                         ++d->preedit_lines_;
1274                 }
1275                 // preedit strings are displayed with dashed underline
1276                 // and partial strings are displayed white on black indicating
1277                 // that we are in selecting mode in the input method.
1278                 // FIXME: rLength == preedit_length is not a changing condition
1279                 // FIXME: should be put out of the loop.
1280                 if (pos >= rStart
1281                         && pos < rStart + rLength
1282                         && !(cursor_pos < rLength && rLength == preedit_length))
1283                         ps = Painter::preedit_selecting;
1284
1285                 if (pos == cursor_pos
1286                         && (cursor_pos < rLength && rLength == preedit_length))
1287                         ps = Painter::preedit_cursor;
1288
1289                 // draw one character and update cur_x.
1290                 cur_x += pain.preeditText(cur_x, cur_y, typed_char, font, ps);
1291         }
1292
1293         // update the preedit string screen area.
1294         update(0, cur_y - d->preedit_lines_*height, viewport()->width(),
1295                 (height + 1) * d->preedit_lines_);
1296
1297         // Don't forget to accept the event!
1298         e->accept();
1299 }
1300
1301
1302 QVariant GuiWorkArea::inputMethodQuery(Qt::InputMethodQuery query) const
1303 {
1304         QRect cur_r(0, 0, 0, 0);
1305         switch (query) {
1306                 // this is the CJK-specific composition window position and
1307                 // the context menu position when the menu key is pressed.
1308                 case Qt::ImMicroFocus:
1309                         cur_r = d->cursor_->rect();
1310                         if (d->preedit_lines_ != 1)
1311                                 cur_r.moveLeft(10);
1312                         cur_r.moveBottom(cur_r.bottom()
1313                                 + cur_r.height() * (d->preedit_lines_ - 1));
1314                         // return lower right of cursor in LyX.
1315                         return cur_r;
1316                 default:
1317                         return QWidget::inputMethodQuery(query);
1318         }
1319 }
1320
1321
1322 void GuiWorkArea::updateWindowTitle()
1323 {
1324         docstring maximize_title;
1325         docstring minimize_title;
1326
1327         Buffer const & buf = d->buffer_view_->buffer();
1328         FileName const file_name = buf.fileName();
1329         if (!file_name.empty()) {
1330                 maximize_title = file_name.displayName(130);
1331                 minimize_title = from_utf8(file_name.onlyFileName());
1332                 if (buf.lyxvc().inUse()) {
1333                         if (buf.lyxvc().locking())
1334                                 maximize_title +=  _(" (version control, locking)");
1335                         else
1336                                 maximize_title +=  _(" (version control)");
1337                 }
1338                 if (!buf.isClean()) {
1339                         maximize_title += _(" (changed)");
1340                         minimize_title += char_type('*');
1341                 }
1342                 if (buf.isReadonly())
1343                         maximize_title += _(" (read only)");
1344         }
1345
1346         QString const new_title = toqstr(maximize_title);
1347         if (new_title != windowTitle()) {
1348                 QWidget::setWindowTitle(new_title);
1349                 QWidget::setWindowIconText(toqstr(minimize_title));
1350                 titleChanged(this);
1351         }
1352 }
1353
1354
1355 bool GuiWorkArea::isFullScreen() const
1356 {
1357         return d->lyx_view_ && d->lyx_view_->isFullScreen();
1358 }
1359
1360
1361 void GuiWorkArea::scheduleRedraw()
1362 {
1363         d->schedule_redraw_ = true;
1364 }
1365
1366
1367 bool GuiWorkArea::inDialogMode() const
1368 {
1369         return d->dialog_mode_;
1370 }
1371
1372
1373 void GuiWorkArea::setDialogMode(bool mode)
1374 {
1375         d->dialog_mode_ = mode;
1376 }
1377
1378
1379 GuiCompleter & GuiWorkArea::completer()
1380 {
1381         return *d->completer_;
1382 }
1383
1384 GuiView const & GuiWorkArea::view() const
1385 {
1386         return *d->lyx_view_;
1387 }
1388
1389
1390 GuiView & GuiWorkArea::view()
1391 {
1392         return *d->lyx_view_;
1393 }
1394
1395 ////////////////////////////////////////////////////////////////////
1396 //
1397 // EmbeddedWorkArea
1398 //
1399 ////////////////////////////////////////////////////////////////////
1400
1401
1402 EmbeddedWorkArea::EmbeddedWorkArea(QWidget * w): GuiWorkArea(w)
1403 {
1404         buffer_ = theBufferList().newBuffer(
1405                 support::FileName::tempName().absFileName() + "_embedded.internal");
1406         buffer_->setUnnamed(true);
1407         buffer_->setFullyLoaded(true);
1408         setBuffer(*buffer_);
1409         setDialogMode(true);
1410 }
1411
1412
1413 EmbeddedWorkArea::~EmbeddedWorkArea()
1414 {
1415         // No need to destroy buffer and bufferview here, because it is done
1416         // in theBufferList() destruction loop at application exit
1417 }
1418
1419
1420 void EmbeddedWorkArea::closeEvent(QCloseEvent * ev)
1421 {
1422         disable();
1423         GuiWorkArea::closeEvent(ev);
1424 }
1425
1426
1427 void EmbeddedWorkArea::hideEvent(QHideEvent * ev)
1428 {
1429         disable();
1430         GuiWorkArea::hideEvent(ev);
1431 }
1432
1433
1434 QSize EmbeddedWorkArea::sizeHint () const
1435 {
1436         // FIXME(?):
1437         // GuiWorkArea sets the size to the screen's viewport
1438         // by returning a value this gets overridden
1439         // EmbeddedWorkArea is now sized to fit in the layout
1440         // of the parent, and has a minimum size set in GuiWorkArea
1441         // which is what we return here
1442         return QSize(100, 70);
1443 }
1444
1445
1446 void EmbeddedWorkArea::disable()
1447 {
1448         stopBlinkingCursor();
1449         if (view().currentWorkArea() != this)
1450                 return;
1451         // No problem if currentMainWorkArea() is 0 (setCurrentWorkArea()
1452         // tolerates it and shows the background logo), what happens if
1453         // an EmbeddedWorkArea is closed after closing all document WAs
1454         view().setCurrentWorkArea(view().currentMainWorkArea());
1455 }
1456
1457 ////////////////////////////////////////////////////////////////////
1458 //
1459 // TabWorkArea
1460 //
1461 ////////////////////////////////////////////////////////////////////
1462
1463 #ifdef Q_WS_MACX
1464 class NoTabFrameMacStyle : public QMacStyle {
1465 public:
1466         ///
1467         QRect subElementRect(SubElement element, const QStyleOption * option,
1468                              const QWidget * widget = 0) const
1469         {
1470                 QRect rect = QMacStyle::subElementRect(element, option, widget);
1471                 bool noBar = static_cast<QTabWidget const *>(widget)->count() <= 1;
1472
1473                 // The Qt Mac style puts the contents into a 3 pixel wide box
1474                 // which looks very ugly and not like other Mac applications.
1475                 // Hence we remove this here, and moreover the 16 pixel round
1476                 // frame above if the tab bar is hidden.
1477                 if (element == QStyle::SE_TabWidgetTabContents) {
1478                         rect.adjust(- rect.left(), 0, rect.left(), 0);
1479                         if (noBar)
1480                                 rect.setTop(0);
1481                 }
1482
1483                 return rect;
1484         }
1485 };
1486
1487 NoTabFrameMacStyle noTabFrameMacStyle;
1488 #endif
1489
1490
1491 TabWorkArea::TabWorkArea(QWidget * parent)
1492         : QTabWidget(parent), clicked_tab_(-1)
1493 {
1494 #ifdef Q_WS_MACX
1495         setStyle(&noTabFrameMacStyle);
1496 #endif
1497 #if QT_VERSION < 0x040500
1498         lyxrc.single_close_tab_button = true;
1499 #endif
1500
1501         QPalette pal = palette();
1502         pal.setColor(QPalette::Active, QPalette::Button,
1503                 pal.color(QPalette::Active, QPalette::Window));
1504         pal.setColor(QPalette::Disabled, QPalette::Button,
1505                 pal.color(QPalette::Disabled, QPalette::Window));
1506         pal.setColor(QPalette::Inactive, QPalette::Button,
1507                 pal.color(QPalette::Inactive, QPalette::Window));
1508
1509         QObject::connect(this, SIGNAL(currentChanged(int)),
1510                 this, SLOT(on_currentTabChanged(int)));
1511
1512         closeBufferButton = new QToolButton(this);
1513         closeBufferButton->setPalette(pal);
1514         // FIXME: rename the icon to closebuffer.png
1515         closeBufferButton->setIcon(QIcon(getPixmap("images/", "closetab", "png")));
1516         closeBufferButton->setText("Close File");
1517         closeBufferButton->setAutoRaise(true);
1518         closeBufferButton->setCursor(Qt::ArrowCursor);
1519         closeBufferButton->setToolTip(qt_("Close File"));
1520         closeBufferButton->setEnabled(true);
1521         QObject::connect(closeBufferButton, SIGNAL(clicked()),
1522                 this, SLOT(closeCurrentBuffer()));
1523         setCornerWidget(closeBufferButton, Qt::TopRightCorner);
1524
1525         // setup drag'n'drop
1526         QTabBar* tb = new DragTabBar;
1527         connect(tb, SIGNAL(tabMoveRequested(int, int)),
1528                 this, SLOT(moveTab(int, int)));
1529         tb->setElideMode(Qt::ElideNone);
1530         setTabBar(tb);
1531
1532         // make us responsible for the context menu of the tabbar
1533         tb->setContextMenuPolicy(Qt::CustomContextMenu);
1534         connect(tb, SIGNAL(customContextMenuRequested(const QPoint &)),
1535                 this, SLOT(showContextMenu(const QPoint &)));
1536 #if QT_VERSION >= 0x040500
1537         connect(tb, SIGNAL(tabCloseRequested(int)),
1538                 this, SLOT(closeTab(int)));
1539 #endif
1540
1541         setUsesScrollButtons(true);
1542 }
1543
1544
1545 void TabWorkArea::mouseDoubleClickEvent(QMouseEvent * event)
1546 {
1547         if (event->button() != Qt::LeftButton)
1548                 return;
1549
1550         // return early if double click on existing tabs
1551         for (int i = 0; i < count(); ++i)
1552                 if (tabBar()->tabRect(i).contains(event->pos()))
1553                         return;
1554
1555         dispatch(FuncRequest(LFUN_BUFFER_NEW));
1556 }
1557
1558
1559 void TabWorkArea::setFullScreen(bool full_screen)
1560 {
1561         for (int i = 0; i != count(); ++i) {
1562                 if (GuiWorkArea * wa = workArea(i))
1563                         wa->setFullScreen(full_screen);
1564         }
1565
1566         if (lyxrc.full_screen_tabbar)
1567                 showBar(!full_screen && count() > 1);
1568 }
1569
1570
1571 void TabWorkArea::showBar(bool show)
1572 {
1573         tabBar()->setEnabled(show);
1574         tabBar()->setVisible(show);
1575         closeBufferButton->setVisible(show && lyxrc.single_close_tab_button);
1576 #if QT_VERSION >= 0x040500
1577         setTabsClosable(!lyxrc.single_close_tab_button);
1578 #endif
1579 }
1580
1581
1582 GuiWorkArea * TabWorkArea::currentWorkArea()
1583 {
1584         if (count() == 0)
1585                 return 0;
1586
1587         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(currentWidget());
1588         LASSERT(wa, /**/);
1589         return wa;
1590 }
1591
1592
1593 GuiWorkArea * TabWorkArea::workArea(int index)
1594 {
1595         return dynamic_cast<GuiWorkArea *>(widget(index));
1596 }
1597
1598
1599 GuiWorkArea * TabWorkArea::workArea(Buffer & buffer)
1600 {
1601         // FIXME: this method doesn't work if we have more than work area
1602         // showing the same buffer.
1603         for (int i = 0; i != count(); ++i) {
1604                 GuiWorkArea * wa = workArea(i);
1605                 LASSERT(wa, return 0);
1606                 if (&wa->bufferView().buffer() == &buffer)
1607                         return wa;
1608         }
1609         return 0;
1610 }
1611
1612
1613 void TabWorkArea::closeAll()
1614 {
1615         while (count()) {
1616                 GuiWorkArea * wa = workArea(0);
1617                 LASSERT(wa, /**/);
1618                 removeTab(0);
1619                 delete wa;
1620         }
1621 }
1622
1623
1624 bool TabWorkArea::setCurrentWorkArea(GuiWorkArea * work_area)
1625 {
1626         LASSERT(work_area, /**/);
1627         int index = indexOf(work_area);
1628         if (index == -1)
1629                 return false;
1630
1631         if (index == currentIndex())
1632                 // Make sure the work area is up to date.
1633                 on_currentTabChanged(index);
1634         else
1635                 // Switch to the work area.
1636                 setCurrentIndex(index);
1637         work_area->setFocus();
1638
1639         return true;
1640 }
1641
1642
1643 GuiWorkArea * TabWorkArea::addWorkArea(Buffer & buffer, GuiView & view)
1644 {
1645         GuiWorkArea * wa = new GuiWorkArea(buffer, view);
1646         wa->setUpdatesEnabled(false);
1647         // Hide tabbar if there's no tab (avoid a resize and a flashing tabbar
1648         // when hiding it again below).
1649         if (!(currentWorkArea() && currentWorkArea()->isFullScreen()))
1650                 showBar(count() > 0);
1651         addTab(wa, wa->windowTitle());
1652         QObject::connect(wa, SIGNAL(titleChanged(GuiWorkArea *)),
1653                 this, SLOT(updateTabTexts()));
1654         if (currentWorkArea() && currentWorkArea()->isFullScreen())
1655                 setFullScreen(true);
1656         else
1657                 // Hide tabbar if there's only one tab.
1658                 showBar(count() > 1);
1659
1660         updateTabTexts();
1661
1662         return wa;
1663 }
1664
1665
1666 bool TabWorkArea::removeWorkArea(GuiWorkArea * work_area)
1667 {
1668         LASSERT(work_area, return false);
1669         int index = indexOf(work_area);
1670         if (index == -1)
1671                 return false;
1672
1673         work_area->setUpdatesEnabled(false);
1674         removeTab(index);
1675         delete work_area;
1676
1677         if (count()) {
1678                 // make sure the next work area is enabled.
1679                 currentWidget()->setUpdatesEnabled(true);
1680                 if (currentWorkArea() && currentWorkArea()->isFullScreen())
1681                         setFullScreen(true);
1682                 else
1683                         // Show tabbar only if there's more than one tab.
1684                         showBar(count() > 1);
1685         } else
1686                 lastWorkAreaRemoved();
1687
1688         updateTabTexts();
1689
1690         return true;
1691 }
1692
1693
1694 void TabWorkArea::on_currentTabChanged(int i)
1695 {
1696         // returns e.g. on application destruction
1697         if (i == -1)
1698                 return;
1699         GuiWorkArea * wa = workArea(i);
1700         LASSERT(wa, return);
1701         wa->setUpdatesEnabled(true);
1702         wa->redraw(true);
1703         wa->setFocus();
1704         ///
1705         currentWorkAreaChanged(wa);
1706
1707         LYXERR(Debug::GUI, "currentTabChanged " << i
1708                 << " File: " << wa->bufferView().buffer().absFileName());
1709 }
1710
1711
1712 void TabWorkArea::closeCurrentBuffer()
1713 {
1714         GuiWorkArea * wa;
1715         if (clicked_tab_ == -1)
1716                 wa = currentWorkArea();
1717         else {
1718                 wa = workArea(clicked_tab_);
1719                 LASSERT(wa, /**/);
1720         }
1721         wa->view().closeWorkArea(wa);
1722 }
1723
1724
1725 void TabWorkArea::hideCurrentTab()
1726 {
1727         GuiWorkArea * wa;
1728         if (clicked_tab_ == -1)
1729                 wa = currentWorkArea();
1730         else {
1731                 wa = workArea(clicked_tab_);
1732                 LASSERT(wa, /**/);
1733         }
1734         wa->view().hideWorkArea(wa);
1735 }
1736
1737
1738 void TabWorkArea::closeTab(int index)
1739 {
1740         on_currentTabChanged(index);
1741         GuiWorkArea * wa;
1742         if (index == -1)
1743                 wa = currentWorkArea();
1744         else {
1745                 wa = workArea(index);
1746                 LASSERT(wa, /**/);
1747         }
1748         wa->view().closeWorkArea(wa);
1749 }
1750
1751
1752 ///
1753 class DisplayPath {
1754 public:
1755         /// make vector happy
1756         DisplayPath() {}
1757         ///
1758         DisplayPath(int tab, FileName const & filename)
1759                 : tab_(tab)
1760         {
1761                 filename_ = (filename.extension() == "lyx") ?
1762                         toqstr(filename.onlyFileNameWithoutExt())
1763                         : toqstr(filename.onlyFileName());
1764                 postfix_ = toqstr(filename.absoluteFilePath()).
1765                         split("/", QString::SkipEmptyParts);
1766                 postfix_.pop_back();
1767                 abs_ = toqstr(filename.absoluteFilePath());
1768                 dottedPrefix_ = false;
1769         }
1770
1771         /// Absolute path for debugging.
1772         QString abs() const
1773         {
1774                 return abs_;
1775         }
1776         /// Add the first segment from the postfix or three dots to the prefix.
1777         /// Merge multiple dot tripples. In fact dots are added lazily, i.e. only
1778         /// when really needed.
1779         void shiftPathSegment(bool dotted)
1780         {
1781                 if (postfix_.count() <= 0)
1782                         return;
1783
1784                 if (!dotted) {
1785                         if (dottedPrefix_ && !prefix_.isEmpty())
1786                                 prefix_ += ".../";
1787                         prefix_ += postfix_.front() + "/";
1788                 }
1789                 dottedPrefix_ = dotted && !prefix_.isEmpty();
1790                 postfix_.pop_front();
1791         }
1792         ///
1793         QString displayString() const
1794         {
1795                 if (prefix_.isEmpty())
1796                         return filename_;
1797
1798                 bool dots = dottedPrefix_ || !postfix_.isEmpty();
1799                 return prefix_ + (dots ? ".../" : "") + filename_;
1800         }
1801         ///
1802         QString forecastPathString() const
1803         {
1804                 if (postfix_.count() == 0)
1805                         return displayString();
1806
1807                 return prefix_
1808                         + (dottedPrefix_ ? ".../" : "")
1809                         + postfix_.front() + "/";
1810         }
1811         ///
1812         bool final() const { return postfix_.empty(); }
1813         ///
1814         int tab() const { return tab_; }
1815
1816 private:
1817         ///
1818         QString prefix_;
1819         ///
1820         QStringList postfix_;
1821         ///
1822         QString filename_;
1823         ///
1824         QString abs_;
1825         ///
1826         int tab_;
1827         ///
1828         bool dottedPrefix_;
1829 };
1830
1831
1832 ///
1833 bool operator<(DisplayPath const & a, DisplayPath const & b)
1834 {
1835         return a.displayString() < b.displayString();
1836 }
1837
1838 ///
1839 bool operator==(DisplayPath const & a, DisplayPath const & b)
1840 {
1841         return a.displayString() == b.displayString();
1842 }
1843
1844
1845 void TabWorkArea::updateTabTexts()
1846 {
1847         size_t n = count();
1848         if (n == 0)
1849                 return;
1850         std::list<DisplayPath> paths;
1851         typedef std::list<DisplayPath>::iterator It;
1852
1853         // collect full names first: path into postfix, empty prefix and
1854         // filename without extension
1855         for (size_t i = 0; i < n; ++i) {
1856                 GuiWorkArea * i_wa = workArea(i);
1857                 FileName const fn = i_wa->bufferView().buffer().fileName();
1858                 paths.push_back(DisplayPath(i, fn));
1859         }
1860
1861         // go through path segments and see if it helps to make the path more unique
1862         bool somethingChanged = true;
1863         bool allFinal = false;
1864         while (somethingChanged && !allFinal) {
1865                 // adding path segments changes order
1866                 paths.sort();
1867
1868                 LYXERR(Debug::GUI, "updateTabTexts() iteration start");
1869                 somethingChanged = false;
1870                 allFinal = true;
1871
1872                 // find segments which are not unique (i.e. non-atomic)
1873                 It it = paths.begin();
1874                 It segStart = it;
1875                 QString segString = it->displayString();
1876                 for (; it != paths.end(); ++it) {
1877                         // look to the next item
1878                         It next = it;
1879                         ++next;
1880
1881                         // final?
1882                         allFinal = allFinal && it->final();
1883
1884                         LYXERR(Debug::GUI, "it = " << it->abs()
1885                                << " => " << it->displayString());
1886
1887                         // still the same segment?
1888                         QString nextString;
1889                         if ((next != paths.end()
1890                              && (nextString = next->displayString()) == segString))
1891                                 continue;
1892                         LYXERR(Debug::GUI, "segment ended");
1893
1894                         // only a trivial one with one element?
1895                         if (it == segStart) {
1896                                 // start new segment
1897                                 segStart = next;
1898                                 segString = nextString;
1899                                 continue;
1900                         }
1901
1902                         // we found a non-atomic segment segStart <= sit <= it < next.
1903                         // Shift path segments and hope for the best
1904                         // that it makes the path more unique.
1905                         somethingChanged = true;
1906                         It sit = segStart;
1907                         QString dspString = sit->forecastPathString();
1908                         LYXERR(Debug::GUI, "first forecast found for "
1909                                << sit->abs() << " => " << dspString);
1910                         ++sit;
1911                         bool moreUnique = false;
1912                         for (; sit != next; ++sit) {
1913                                 if (sit->forecastPathString() != dspString) {
1914                                         LYXERR(Debug::GUI, "different forecast found for "
1915                                                 << sit->abs() << " => " << sit->forecastPathString());
1916                                         moreUnique = true;
1917                                         break;
1918                                 }
1919                                 LYXERR(Debug::GUI, "same forecast found for "
1920                                         << sit->abs() << " => " << dspString);
1921                         }
1922
1923                         // if the path segment helped, add it. Otherwise add dots
1924                         bool dots = !moreUnique;
1925                         LYXERR(Debug::GUI, "using dots = " << dots);
1926                         for (sit = segStart; sit != next; ++sit) {
1927                                 sit->shiftPathSegment(dots);
1928                                 LYXERR(Debug::GUI, "shifting "
1929                                         << sit->abs() << " => " << sit->displayString());
1930                         }
1931
1932                         // start new segment
1933                         segStart = next;
1934                         segString = nextString;
1935                 }
1936         }
1937
1938         // set new tab titles
1939         for (It it = paths.begin(); it != paths.end(); ++it) {
1940                 int const tab_index = it->tab();
1941                 Buffer const & buf = workArea(tab_index)->bufferView().buffer();
1942                 QString tab_text = it->displayString();
1943                 if (!buf.fileName().empty() && !buf.isClean())
1944                         tab_text += "*";
1945                 setTabText(tab_index, tab_text);
1946                 setTabToolTip(tab_index, it->abs());
1947         }
1948 }
1949
1950
1951 void TabWorkArea::showContextMenu(const QPoint & pos)
1952 {
1953         // which tab?
1954         clicked_tab_ = static_cast<DragTabBar *>(tabBar())->tabAt(pos);
1955         if (clicked_tab_ == -1)
1956                 return;
1957
1958         // show tab popup
1959         QMenu popup;
1960         popup.addAction(QIcon(getPixmap("images/", "hidetab", "png")),
1961                 qt_("Hide tab"), this, SLOT(hideCurrentTab()));
1962         popup.addAction(QIcon(getPixmap("images/", "closetab", "png")),
1963                 qt_("Close tab"), this, SLOT(closeCurrentBuffer()));
1964         popup.exec(tabBar()->mapToGlobal(pos));
1965
1966         clicked_tab_ = -1;
1967 }
1968
1969
1970 void TabWorkArea::moveTab(int fromIndex, int toIndex)
1971 {
1972         QWidget * w = widget(fromIndex);
1973         QIcon icon = tabIcon(fromIndex);
1974         QString text = tabText(fromIndex);
1975
1976         setCurrentIndex(fromIndex);
1977         removeTab(fromIndex);
1978         insertTab(toIndex, w, icon, text);
1979         setCurrentIndex(toIndex);
1980 }
1981
1982
1983 DragTabBar::DragTabBar(QWidget* parent)
1984         : QTabBar(parent)
1985 {
1986         setAcceptDrops(true);
1987 #if QT_VERSION >= 0x040500
1988         setTabsClosable(!lyxrc.single_close_tab_button);
1989 #endif
1990 }
1991
1992
1993 #if QT_VERSION < 0x040300
1994 int DragTabBar::tabAt(QPoint const & position) const
1995 {
1996         const int max = count();
1997         for (int i = 0; i < max; ++i) {
1998                 if (tabRect(i).contains(position))
1999                         return i;
2000         }
2001         return -1;
2002 }
2003 #endif
2004
2005
2006 void DragTabBar::mousePressEvent(QMouseEvent * event)
2007 {
2008         if (event->button() == Qt::LeftButton)
2009                 dragStartPos_ = event->pos();
2010         QTabBar::mousePressEvent(event);
2011 }
2012
2013
2014 void DragTabBar::mouseMoveEvent(QMouseEvent * event)
2015 {
2016         // If the left button isn't pressed anymore then return
2017         if (!(event->buttons() & Qt::LeftButton))
2018                 return;
2019
2020         // If the distance is too small then return
2021         if ((event->pos() - dragStartPos_).manhattanLength()
2022             < QApplication::startDragDistance())
2023                 return;
2024
2025         // did we hit something after all?
2026         int tab = tabAt(dragStartPos_);
2027         if (tab == -1)
2028                 return;
2029
2030         // simulate button release to remove highlight from button
2031         int i = currentIndex();
2032         QMouseEvent me(QEvent::MouseButtonRelease, dragStartPos_,
2033                 event->button(), event->buttons(), 0);
2034         QTabBar::mouseReleaseEvent(&me);
2035         setCurrentIndex(i);
2036
2037         // initiate Drag
2038         QDrag * drag = new QDrag(this);
2039         QMimeData * mimeData = new QMimeData;
2040         // a crude way to distinguish tab-reodering drops from other ones
2041         mimeData->setData("action", "tab-reordering") ;
2042         drag->setMimeData(mimeData);
2043
2044 #if QT_VERSION >= 0x040300
2045         // get tab pixmap as cursor
2046         QRect r = tabRect(tab);
2047         QPixmap pixmap(r.size());
2048         render(&pixmap, - r.topLeft());
2049         drag->setPixmap(pixmap);
2050         drag->exec();
2051 #else
2052         drag->start(Qt::MoveAction);
2053 #endif
2054
2055 }
2056
2057
2058 void DragTabBar::dragEnterEvent(QDragEnterEvent * event)
2059 {
2060         // Only accept if it's an tab-reordering request
2061         QMimeData const * m = event->mimeData();
2062         QStringList formats = m->formats();
2063         if (formats.contains("action")
2064             && m->data("action") == "tab-reordering")
2065                 event->acceptProposedAction();
2066 }
2067
2068
2069 void DragTabBar::dropEvent(QDropEvent * event)
2070 {
2071         int fromIndex = tabAt(dragStartPos_);
2072         int toIndex = tabAt(event->pos());
2073
2074         // Tell interested objects that
2075         if (fromIndex != toIndex)
2076                 tabMoveRequested(fromIndex, toIndex);
2077         event->acceptProposedAction();
2078 }
2079
2080
2081 } // namespace frontend
2082 } // namespace lyx
2083
2084 #include "moc_GuiWorkArea.cpp"