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