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