/* This file is (c) 2008-2012 Konstantin Isakov <ikm@goldendict.org>
 * Part of GoldenDict. Licensed under GPLv3 or later, see the LICENSE file */

#include "scanpopup.hh"
#include "folding.hh"
#include <QCursor>
#include <QPixmap>
#include <QBitmap>
#include <QMenu>
#include <QMouseEvent>
#if (QT_VERSION < QT_VERSION_CHECK(6,0,0))
#include <QDesktopWidget>
#include <QStringList>
#endif
#include "gddebug.hh"
#include "gestures.hh"

#ifdef Q_OS_MAC
#include "macos/macmouseover.hh"
#define MouseOver MacMouseOver
#endif
#include "base_type.hh"

/// We use different window flags under Windows and X11 due to slight differences
/// in their behavior on those platforms.
static const Qt::WindowFlags defaultUnpinnedWindowFlags =

#if defined (Q_OS_WIN)
Qt::Tool | Qt::FramelessWindowHint | Qt::WindowStaysOnTopHint
#else
Qt::Popup
#endif
;

static const Qt::WindowFlags pinnedWindowFlags =
#ifdef HAVE_X11
/// With the Qt::Dialog flag, scan popup is always on top of the main window
/// on Linux/X11 with Qt 4, Qt 5 since version 5.12.1 (QTBUG-74309).
/// Qt::Window allows to use the scan popup and the main window independently.
Qt::Window
#else
Qt::Dialog
#endif
;

#ifdef HAVE_X11
static bool ownsClipboardMode( QClipboard::Mode mode )
{
  const QClipboard & clipboard = *QApplication::clipboard();
  switch( mode )
  {
    case QClipboard::Clipboard:
      return clipboard.ownsClipboard();
    case QClipboard::Selection:
      return clipboard.ownsSelection();
    case QClipboard::FindBuffer:
      return clipboard.ownsFindBuffer();
  }

  gdWarning( "Unknown clipboard mode: %d\n", static_cast< int >( mode ) );
  return false;
}
#endif

ScanPopup::ScanPopup( QWidget * parent,
                      Config::Class & cfg_,
                      ArticleNetworkAccessManager & articleNetMgr,
                      AudioPlayerPtr const & audioPlayer_,
                      std::vector< sptr< Dictionary::Class > > const & allDictionaries_,
                      Instances::Groups const & groups_,
                      History & history_ ):
  QMainWindow( parent ),
  cfg( cfg_ ),
  allDictionaries( allDictionaries_ ),
  groups( groups_ ),
  history( history_ ),
  escapeAction( this ),
  switchExpandModeAction( this ),
  focusTranslateLineAction( this ),
  openSearchAction( this ),
  wordFinder( this ),
  dictionaryBar( this, configEvents, cfg.editDictionaryCommandLine, cfg.preferences.maxDictionaryRefsInContextMenu ),
  hideTimer( this )
{
  ui.setupUi( this );

  openSearchAction.setShortcut( QKeySequence( "Ctrl+F" ) );

  if( layoutDirection() == Qt::RightToLeft )
  {
    // Adjust button icons for Right-To-Left layout
    ui.goBackButton->setIcon( QIcon( ":/icons/next.svg" ) );
    ui.goForwardButton->setIcon( QIcon( ":/icons/previous.svg" ) );
  }

  mainStatusBar = new MainStatusBar( this );

  ui.queryError->hide();

  definition = new ArticleView( ui.outerFrame, articleNetMgr, audioPlayer_,
                                allDictionaries, groups, true, cfg,
                                openSearchAction,
                                ui.translateBox->translateLine(),
                                dictionaryBar.toggleViewAction()
                                );

  connect( definition, &ArticleView::inspectSignal, this, &ScanPopup::inspectElementWhenPinned );
  connect( definition, &ArticleView::forceAddWordToHistory, this, &ScanPopup::forceAddWordToHistory );
  connect( this, &ScanPopup::closeMenu, definition, &ArticleView::closePopupMenu );
  connect( definition, &ArticleView::sendWordToHistory, this, &ScanPopup::sendWordToHistory );
  connect( definition, &ArticleView::typingEvent, this, &ScanPopup::typingEvent );

  wordListDefaultFont      = ui.translateBox->wordList()->font();
  translateLineDefaultFont = ui.translateBox->font();
  groupListDefaultFont = ui.groupList->font();

  ui.mainLayout->addWidget( definition );

  ui.translateBox->wordList()->attachFinder( &wordFinder );
  ui.translateBox->wordList()->setFocusPolicy(Qt::ClickFocus);
  ui.translateBox->translateLine()->installEventFilter( this );
  definition->installEventFilter(this);
  this->installEventFilter(this);

  connect( ui.translateBox->translateLine(), &QLineEdit::textChanged, this, &ScanPopup::translateInputChanged );

  connect( ui.translateBox->translateLine(), &QLineEdit::returnPressed, this, &ScanPopup::translateInputFinished );

  connect( ui.translateBox->wordList(), &QListWidget::itemClicked, this, &ScanPopup::wordListItemActivated );

  connect( ui.translateBox->wordList(),
    SIGNAL( itemDoubleClicked( QListWidgetItem * ) ),
    this,
    SLOT( wordListItemActivated( QListWidgetItem * ) ) );

  connect( ui.translateBox->wordList(), &WordList::statusBarMessage, this, &ScanPopup::showStatusBarMessage );

  ui.pronounceButton->setDisabled( true );

  ui.groupList->fill( groups );
  ui.groupList->setCurrentGroup( cfg.lastPopupGroupId );

  dictionaryBar.setFloatable( false );

  Instances::Group const * igrp = groups.findGroup( cfg.lastPopupGroupId );
  if( cfg.lastPopupGroupId == Instances::Group::AllGroupId )
  {
    if( igrp )
      igrp->checkMutedDictionaries( &cfg.popupMutedDictionaries );
    dictionaryBar.setMutedDictionaries( &cfg.popupMutedDictionaries );
  }
  else
  {
    Config::Group * grp = cfg.getGroup( cfg.lastPopupGroupId );
    if( igrp && grp )
      igrp->checkMutedDictionaries( &grp->popupMutedDictionaries );
    dictionaryBar.setMutedDictionaries( grp ? &grp->popupMutedDictionaries : 0 );
  }

  addToolBar( Qt::RightToolBarArea, &dictionaryBar );

  connect( &dictionaryBar, SIGNAL(editGroupRequested()),
           this, SLOT(editGroupRequested()) );
  connect( this, &ScanPopup::closeMenu, &dictionaryBar, &DictionaryBar::closePopupMenu );
  connect( &dictionaryBar, &DictionaryBar::showDictionaryInfo, this, &ScanPopup::showDictionaryInfo );
  connect( &dictionaryBar, &DictionaryBar::openDictionaryFolder, this, &ScanPopup::openDictionaryFolder );

  pinnedGeometry = cfg.popupWindowGeometry;
  if( cfg.popupWindowGeometry.size() )
    restoreGeometry( cfg.popupWindowGeometry );

  if ( cfg.popupWindowState.size() )
    restoreState( cfg.popupWindowState, 1 );

  ui.onTopButton->setChecked( cfg.popupWindowAlwaysOnTop );
  ui.onTopButton->setVisible( cfg.pinPopupWindow );
  connect( ui.onTopButton, &QAbstractButton::clicked, this, &ScanPopup::alwaysOnTopClicked );

  ui.pinButton->setChecked( cfg.pinPopupWindow );

  if ( cfg.pinPopupWindow )
  {
    dictionaryBar.setMovable( true );
    Qt::WindowFlags flags = pinnedWindowFlags;
    if( cfg.popupWindowAlwaysOnTop )
      flags |= Qt::WindowStaysOnTopHint;
    setWindowFlags( flags );
#ifdef Q_OS_MACOS
    setAttribute(Qt::WA_MacAlwaysShowToolWindow);
#endif
  }
  else
  {
    dictionaryBar.setMovable( false );
    setWindowFlags( unpinnedWindowFlags() );
#ifdef Q_OS_MACOS
    setAttribute(Qt::WA_MacAlwaysShowToolWindow, false);
#endif
  }

  connect( &configEvents, &Config::Events::mutedDictionariesChanged, this, &ScanPopup::mutedDictionariesChanged );

  definition->focus();

  #if 0 // Experimental code to give window a non-rectangular shape (i.e.
        // balloon) using a colorkey mask.
  QPixmap pixMask( size() );
  render( &pixMask );

  setMask( pixMask.createMaskFromColor( QColor( 255, 0, 0 ) ) );

  // This helps against flickering
  setAttribute( Qt::WA_NoSystemBackground );
  #endif

  escapeAction.setShortcut( QKeySequence( "Esc" ) );
  addAction( &escapeAction );
  connect( &escapeAction, &QAction::triggered, this, &ScanPopup::escapePressed );

  focusTranslateLineAction.setShortcutContext( Qt::WidgetWithChildrenShortcut );
  addAction( &focusTranslateLineAction );
  focusTranslateLineAction.setShortcuts( QList< QKeySequence >() <<
                                         QKeySequence( "Alt+D" ) <<
                                         QKeySequence( "Ctrl+L" ) );

  connect( &focusTranslateLineAction, &QAction::triggered, this, &ScanPopup::focusTranslateLine );

  QAction * const focusArticleViewAction = new QAction( this );
  focusArticleViewAction->setShortcutContext( Qt::WidgetWithChildrenShortcut );
  focusArticleViewAction->setShortcut( QKeySequence( "Ctrl+N" ) );
  addAction( focusArticleViewAction );
  connect( focusArticleViewAction, &QAction::triggered, definition, &ArticleView::focus );

  switchExpandModeAction.setShortcuts( QList< QKeySequence >() <<
                                       QKeySequence( Qt::CTRL | Qt::Key_8 ) <<
                                       QKeySequence( Qt::CTRL | Qt::Key_Asterisk ) <<
                                       QKeySequence( Qt::CTRL | Qt::SHIFT | Qt::Key_8 ) );

  addAction( &switchExpandModeAction );
  connect( &switchExpandModeAction, &QAction::triggered, this, &ScanPopup::switchExpandOptionalPartsMode );

  connect( ui.groupList, &QComboBox::currentIndexChanged,
           this, &ScanPopup::currentGroupChanged);

  connect( &wordFinder, &WordFinder::finished, this, &ScanPopup::prefixMatchFinished );

  connect( ui.pinButton, &QAbstractButton::clicked, this, &ScanPopup::pinButtonClicked );

  connect( definition, &ArticleView::pageLoaded, this, &ScanPopup::pageLoaded );

  connect( definition, &ArticleView::statusBarMessage, this, &ScanPopup::showStatusBarMessage );

  connect( definition, &ArticleView::titleChanged, this, &ScanPopup::titleChanged );

#ifdef Q_OS_MAC
  connect( &MouseOver::instance(),
    SIGNAL( hovered( QString const &, bool ) ),
    this,
    SLOT( mouseHovered( QString const &, bool ) ) );
#endif

  hideTimer.setSingleShot( true );
  hideTimer.setInterval( 400 );

  connect( &hideTimer, &QTimer::timeout, this, &ScanPopup::hideTimerExpired );

  mouseGrabPollTimer.setSingleShot( false );
  mouseGrabPollTimer.setInterval( 10 );
  connect( &mouseGrabPollTimer, &QTimer::timeout, this, &ScanPopup::mouseGrabPoll );
#ifdef Q_OS_MAC
  MouseOver::instance().setPreferencesPtr( &( cfg.preferences ) );
#endif
  ui.goBackButton->setEnabled( false );
  ui.goForwardButton->setEnabled( false );

  grabGesture( Gestures::GDPinchGestureType );
  grabGesture( Gestures::GDSwipeGestureType );

#ifdef HAVE_X11
  scanFlag = new ScanFlag( this );

  connect( scanFlag, &ScanFlag::requestScanPopup,
    this, [=]{
    translateWordFromSelection();
  });

  // Use delay show to prevent multiple popups while selection in progress
  selectionDelayTimer.setSingleShot( true );
  selectionDelayTimer.setInterval( 800 );

  connect( &selectionDelayTimer, &QTimer::timeout, this, &ScanPopup::translateWordFromSelection );
#endif

  applyZoomFactor();
  applyWordsZoomLevel();
}

void ScanPopup::refresh() {

  // TODO: GroupCombox's update should be moved inside GroupCombox

  // currentIndexChanged() signal is very trigger-happy. To avoid triggering
  // it, we disconnect it while we're clearing and filling back groups.
  disconnect( ui.groupList, &GroupComboBox::currentIndexChanged,
    this, &ScanPopup::currentGroupChanged );

  auto OldGroupID = ui.groupList->getCurrentGroup();

  // repopulate
  ui.groupList->clear();
  ui.groupList->fill( groups );

  ui.groupList->setCurrentGroup( OldGroupID ); // This does nothing if OldGroupID doesn't exist;

  ui.groupList->setVisible(!cfg.groups.empty());

  updateDictionaryBar();

  connect( ui.groupList, &GroupComboBox::currentIndexChanged,
    this, &ScanPopup::currentGroupChanged );
}


ScanPopup::~ScanPopup()
{
  saveConfigData();

  ungrabGesture( Gestures::GDPinchGestureType );
  ungrabGesture( Gestures::GDSwipeGestureType );
}

void ScanPopup::saveConfigData()
{
  // Save state, geometry and pin status
  cfg.popupWindowState = saveState( 1 );
  cfg.popupWindowGeometry = saveGeometry();
  cfg.pinPopupWindow = ui.pinButton->isChecked();
  cfg.popupWindowAlwaysOnTop = ui.onTopButton->isChecked();
}

void ScanPopup::inspectElementWhenPinned( QWebEnginePage * page ){
  if(cfg.pinPopupWindow)
    emit inspectSignal(page);
}

void ScanPopup::applyZoomFactor()
{
  definition->setZoomFactor( cfg.preferences.zoomFactor );
}

void ScanPopup::applyWordsZoomLevel()
{
  QFont font( wordListDefaultFont );
  int ps = font.pointSize();

  if ( cfg.preferences.wordsZoomLevel != 0 )
  {
    ps += cfg.preferences.wordsZoomLevel;
    if ( ps < 1 )
      ps = 1;
    font.setPointSize( ps );
  }

  if ( ui.translateBox->wordList()->font().pointSize() != ps )
    ui.translateBox->wordList()->setFont( font );

  font = translateLineDefaultFont;
  ps = font.pointSize();

  if ( cfg.preferences.wordsZoomLevel != 0 )
  {
    ps += cfg.preferences.wordsZoomLevel;
    if ( ps < 1 )
      ps = 1;
    font.setPointSize( ps );
  }

  if ( ui.translateBox->translateLine()->font().pointSize() != ps )
    ui.translateBox->translateLine()->setFont( font );

  font = groupListDefaultFont;
  ps = font.pointSize();

  if ( cfg.preferences.wordsZoomLevel != 0 )
  {
    ps += cfg.preferences.wordsZoomLevel;
    if ( ps < 1 )
      ps = 1;
    font.setPointSize( ps );
  }

  if ( ui.groupList->font().pointSize() != ps )
  {
    disconnect( ui.groupList, &GroupComboBox::currentIndexChanged,
                this, &ScanPopup::currentGroupChanged );
    int n = ui.groupList->currentIndex();
    ui.groupList->clear();
    ui.groupList->setFont( font );
    ui.groupList->fill( groups );
    ui.groupList->setCurrentIndex( n );
    connect( ui.groupList, &GroupComboBox::currentIndexChanged,
                this, &ScanPopup::currentGroupChanged );
  }

  ui.outerFrame->layout()->activate();
}

Qt::WindowFlags ScanPopup::unpinnedWindowFlags() const
{
  return defaultUnpinnedWindowFlags;
}

void ScanPopup::translateWordFromClipboard()
{
	return translateWordFromClipboard(QClipboard::Clipboard);
}

void ScanPopup::translateWordFromSelection()
{
	return translateWordFromClipboard(QClipboard::Selection);
}

void ScanPopup::editGroupRequested()
{
  emit editGroupRequested( ui.groupList->getCurrentGroup() );
}

void ScanPopup::translateWordFromClipboard(QClipboard::Mode m)
{
  qDebug()<< "translating from clipboard or selection" ;

  QString subtype = "plain";

  QString str = QApplication::clipboard()->text( subtype, m);
  qDebug() << "clipboard data:" << str;
  translateWord( str );
}

void ScanPopup::translateWord( QString const & word )
{
  pendingInputPhrase = cfg.preferences.sanitizeInputPhrase( word );

  if ( !pendingInputPhrase.isValid() )
    return; // Nothing there

#ifdef HAVE_X11
  emit hideScanFlag();
#endif

  inputPhrase = pendingInputPhrase;
  engagePopup( false,
#ifdef Q_OS_WIN
      true // We only focus popup under Windows when activated via Ctrl+C+C
           // -- on Linux it already has an implicit focus
#else
      false
#endif
      );
}

void ScanPopup::mouseHovered( QString const & str, bool forcePopup )
{
  handleInputWord( str, forcePopup );
}

[[deprecated]]
void ScanPopup::handleInputWord( QString const & str, bool forcePopup )
{
  Config::InputPhrase sanitizedPhrase = cfg.preferences.sanitizeInputPhrase( str );

  if ( isVisible() && sanitizedPhrase == inputPhrase )
  {
    // Attempt to translate the same word we already have shown in scan popup.
    // Ignore it, as it is probably a spurious mouseover event.
    return;
  }

  pendingInputPhrase = sanitizedPhrase;


#ifdef HAVE_X11
  if ( cfg.preferences.showScanFlag ) {
    inputPhrase = pendingInputPhrase;
    emit showScanFlag();
    return;
  }
#endif

  inputPhrase = pendingInputPhrase;
  engagePopup( forcePopup );
}

#ifdef HAVE_X11
void ScanPopup::showEngagePopup()
{
  engagePopup(false);
}
#endif

void ScanPopup::engagePopup( bool forcePopup, bool giveFocus )
{
  if( cfg.preferences.scanToMainWindow && !forcePopup )
  {
    // Send translated word to main window istead of show popup
    emit sendPhraseToMainWindow( inputPhrase );
    return;
  }

  definition->setSelectionBySingleClick( cfg.preferences.selectWordBySingleClick );

  if ( !isVisible() )
  {
    // Need to show the window

    if ( !ui.pinButton->isChecked() )
    {
      // Decide where should the window land

      QPoint currentPos = QCursor::pos();

      auto screen = QGuiApplication::screenAt( currentPos );
      if ( !screen )
        return;

      QRect desktop = screen->geometry();

      QSize windowSize = geometry().size();

      int x, y;

      /// Try the to-the-right placement
      if ( currentPos.x() + 4 + windowSize.width() <= desktop.topRight().x() )
        x = currentPos.x() + 4;
      else
      /// Try the to-the-left placement
      if ( currentPos.x() - 4 - windowSize.width() >= desktop.x() )
        x = currentPos.x() - 4 - windowSize.width();
      else
      // Center it
        x = desktop.x() + ( desktop.width() - windowSize.width() ) / 2;

      /// Try the to-the-bottom placement
      if ( currentPos.y() + 15 + windowSize.height() <= desktop.bottomLeft().y() )
        y = currentPos.y() + 15;
      else
      /// Try the to-the-top placement
      if ( currentPos.y() - 15 - windowSize.height() >= desktop.y() )
        y = currentPos.y() - 15 - windowSize.height();
      else
      // Center it
        y = desktop.y() + ( desktop.height() - windowSize.height() ) / 2;

      move( x, y );
    }
    else
    {
      if( pinnedGeometry.size() > 0 )
        restoreGeometry( pinnedGeometry );
    }

    show();

#if defined( HAVE_X11 )
    // Ensure that the window always has focus on X11 with Qt::Tool flag.
    // This also often prevents the window from disappearing prematurely with Qt::Popup flag,
    // especially when combined with Qt::X11BypassWindowManagerHint flag.
    if ( !ui.pinButton->isChecked() )
      giveFocus = true;
#endif

    if ( giveFocus )
    {
      activateWindow();
      raise();
    }

    if ( !ui.pinButton->isChecked() )
    {
      mouseEnteredOnce = false;
      // Need to monitor the mouse so we know when to hide the window
      interceptMouse();
    }

    // This produced some funky mouse grip-related bugs so we commented it out
    //QApplication::processEvents(); // Make window appear immediately no matter what
  }
  else if( ui.pinButton->isChecked() ) {
    // Pinned-down window isn't always on top, so we need to raise it
    show();
    if( cfg.preferences.raiseWindowOnSearch ) {
      activateWindow();
      raise();
    }
  }
#if defined( HAVE_X11 )
  else if( ( windowFlags() & Qt::Tool ) == Qt::Tool && cfg.preferences.raiseWindowOnSearch ) {
    // Ensure that the window with Qt::Tool flag always has focus on X11.
    activateWindow();
    raise();
  }
#endif

  if ( ui.pinButton->isChecked() )
       setWindowTitle( tr( "%1 - %2" ).arg( elideInputWord(), "GoldenDict" ) );

  /// Too large strings make window expand which is probably not what user
  /// wants
  ui.translateBox->setText( Folding::escapeWildcardSymbols( inputPhrase.phrase ), false );
  translateBoxSuffix = inputPhrase.punctuationSuffix;

  showTranslationFor( inputPhrase );
}

QString ScanPopup::elideInputWord()
{
  QString const & inputWord = inputPhrase.phrase;
  return inputWord.size() > 32 ? inputWord.mid( 0, 32 ) + "..." : inputWord;
}
void ScanPopup::currentGroupChanged( int )
{
    cfg.lastPopupGroupId = ui.groupList->getCurrentGroup();
    Instances::Group const * igrp = groups.findGroup( cfg.lastPopupGroupId );
    if( cfg.lastPopupGroupId == Instances::Group::AllGroupId )
    {
      if( igrp )
        igrp->checkMutedDictionaries( &cfg.popupMutedDictionaries );
      dictionaryBar.setMutedDictionaries( &cfg.popupMutedDictionaries );
    }
    else
    {
      Config::Group * grp = cfg.getGroup( cfg.lastPopupGroupId );
      if( grp )
      {
        if( igrp )
          igrp->checkMutedDictionaries( &grp->popupMutedDictionaries );
        dictionaryBar.setMutedDictionaries( &grp->popupMutedDictionaries );
      }
      else
        dictionaryBar.setMutedDictionaries( 0 );
    }

  updateDictionaryBar();

  if ( isVisible() )
  {
    updateSuggestionList();
    translateInputFinished();
  }

  cfg.lastPopupGroupId = ui.groupList->getCurrentGroup();
}

void ScanPopup::wordListItemActivated( QListWidgetItem * item )
{
  showTranslationFor( Config::InputPhrase::fromPhrase( item->text() ) );
}

void ScanPopup::translateInputChanged( QString const & text )
{
  updateSuggestionList( text );
  translateBoxSuffix = QString();
}

void ScanPopup::updateSuggestionList()
{
  updateSuggestionList( ui.translateBox->translateLine()->text() );
}

void ScanPopup::updateSuggestionList( QString const & text )
{
  mainStatusBar->clearMessage();
  ui.translateBox->wordList()->setCurrentItem( 0, QItemSelectionModel::Clear );

  QString req = text.trimmed();

  if ( !req.size() )
  {
    // An empty request always results in an empty result
    wordFinder.cancel();
    ui.translateBox->wordList()->clear();
    ui.translateBox->wordList()->unsetCursor();

    // Reset the noResults mark if it's on right now
    if ( ui.translateBox->translateLine()->property( "noResults" ).toBool() )
    {
      auto translateLine=ui.translateBox->translateLine();
      translateLine->setProperty( "noResults", false );

      Utils::Widget::setNoResultColor( translateLine, false );
    }
    return;
  }

  ui.translateBox->wordList()->setCursor( Qt::WaitCursor );

  wordFinder.prefixMatch( req, getActiveDicts() );
}

void ScanPopup::translateInputFinished()
{
  inputPhrase.phrase = Folding::unescapeWildcardSymbols( ui.translateBox->translateLine()->text().trimmed() );
  inputPhrase.punctuationSuffix = translateBoxSuffix;
  showTranslationFor( inputPhrase );
}

void ScanPopup::showTranslationFor( Config::InputPhrase const & inputPhrase )
{
  ui.pronounceButton->setDisabled( true );

  unsigned groupId = ui.groupList->getCurrentGroup();
  definition->showDefinition( inputPhrase, groupId );
  definition->focus();
}

vector< sptr< Dictionary::Class > > const & ScanPopup::getActiveDicts()
{
  int current = ui.groupList->currentIndex();

  Q_ASSERT(0 <= current || current <= groups.size());

  Config::MutedDictionaries const * mutedDictionaries = dictionaryBar.getMutedDictionaries();

  if ( !dictionaryBar.toggleViewAction()->isChecked() || mutedDictionaries == nullptr ){
    return groups[current].dictionaries;
  }

  vector< sptr< Dictionary::Class > > const & activeDicts =
  groups[current].dictionaries;

  // Populate the special dictionariesUnmuted array with only unmuted
  // dictionaries

  dictionariesUnmuted.clear();
  dictionariesUnmuted.reserve( activeDicts.size() );

  for(const auto & activeDict : activeDicts){
    if ( !mutedDictionaries->contains(QString::fromStdString( activeDict->getId() ) ) ){
      dictionariesUnmuted.push_back( activeDict );
    }
  }

  return dictionariesUnmuted;
}

void ScanPopup::typingEvent( QString const & t )
{
  if ( t == "\n" || t == "\r" ) {
    focusTranslateLine();
  }
  else {
    ui.translateBox->translateLine()->clear();
    ui.translateBox->translateLine()->setFocus();
    ui.translateBox->setText( t, true );
    ui.translateBox->translateLine()->setCursorPosition( t.size() );
  }
}

bool ScanPopup::eventFilter( QObject * watched, QEvent * event )
{
  if ( watched == ui.translateBox->translateLine() && event->type() == QEvent::FocusIn )
  {
    const QFocusEvent * focusEvent = static_cast< QFocusEvent * >( event );

    // select all on mouse click
    if ( focusEvent->reason() == Qt::MouseFocusReason ) {
      QTimer::singleShot( 0, this, &ScanPopup::focusTranslateLine );
    }
    return false;
  }

  if ( mouseIntercepted )
  {
    // We're only interested in our events

    if ( event->type() == QEvent::MouseMove )
    {
      QMouseEvent * mouseEvent = ( QMouseEvent * ) event;
      reactOnMouseMove( mouseEvent->globalPos() );
    }
  }

  if ( event->type() == QEvent::KeyPress && watched != ui.translateBox->translateLine() ) {

    if ( const auto key_event = dynamic_cast< QKeyEvent * >(event);  key_event->modifiers() == Qt::NoModifier ) {
      const QString text = key_event->text();

      if ( Utils::ignoreKeyEvent( key_event ) ||
           key_event->key() == Qt::Key_Return ||
           key_event->key() == Qt::Key_Enter )
          return false; // Those key have other uses than to start typing
      // or don't make sense
      if ( !text.isEmpty() ) {
          typingEvent( text );
          return true;
      }
    }

  }

  return QMainWindow::eventFilter( watched, event );
}

void ScanPopup::reactOnMouseMove( QPoint const & p )
{
  if ( geometry().contains( p ) )
  {
//        GD_DPRINTF( "got inside\n" );

    hideTimer.stop();
    mouseEnteredOnce = true;
    uninterceptMouse();
  }
  else
  {
//        GD_DPRINTF( "outside\n" );
    // We're in grab mode and outside the window - calculate the
    // distance from it. We might want to hide it.

    // When the mouse has entered once, we don't allow it stayng outside,
    // but we give a grace period for it to return.
    int proximity = mouseEnteredOnce ? 0 : 60;

    // Note: watched == this ensures no other child objects popping out are
    // receiving this event, meaning there's basically nothing under the
    // cursor.
    if ( /*watched == this &&*/
         !frameGeometry().adjusted( -proximity, -proximity, proximity, proximity ).
         contains( p ) )
    {
      // We've way too far from the window -- hide the popup

      // If the mouse never entered the popup, hide the window instantly --
      // the user just moved the cursor further away from the window.

      if ( !mouseEnteredOnce )
        hideWindow();
      else
        hideTimer.start();
    }
  }
}

void ScanPopup::mousePressEvent( QMouseEvent * ev )
{
  // With mouse grabs, the press can occur anywhere on the screen, which
  // might mean hiding the window.

  if ( !frameGeometry().contains( ev->globalPos() ) )
  {
    hideWindow();

    return;
  }

  if ( ev->button() == Qt::LeftButton )
  {
    startPos = ev->globalPos();
    setCursor( Qt::ClosedHandCursor );
  }

  QMainWindow::mousePressEvent( ev );
}

void ScanPopup::mouseMoveEvent( QMouseEvent * event )
{
  if ( event->buttons() && cursor().shape() == Qt::ClosedHandCursor )
  {
    QPoint newPos = event->globalPos();

    QPoint delta = newPos - startPos;

    startPos = newPos;

    // Move the window

    move( pos() + delta );
  }

  QMainWindow::mouseMoveEvent( event );
}

void ScanPopup::mouseReleaseEvent( QMouseEvent * ev )
{
  unsetCursor();
  QMainWindow::mouseReleaseEvent( ev );
}

void ScanPopup::leaveEvent( QEvent * event )
{
  QMainWindow::leaveEvent( event );

  // We hide the popup when the mouse leaves it.

  // Combo-boxes seem to generate leave events for their parents when
  // unfolded, so we check coordinates as well.
  // If the dialog is pinned, we don't hide the popup.
  // If some mouse buttons are pressed, we don't hide the popup either,
  // since it indicates the move operation is underway.
  if ( !ui.pinButton->isChecked() && !geometry().contains( QCursor::pos() ) &&
       QApplication::mouseButtons() == Qt::NoButton )
  {
    hideTimer.start();
  }
}

#if (QT_VERSION >= QT_VERSION_CHECK(6,0,0))
void ScanPopup::enterEvent( QEnterEvent * event )
#else
void ScanPopup::enterEvent( QEvent * event )
#endif
{
  QMainWindow::enterEvent( event );

  if ( mouseEnteredOnce )
  {
    // We "enter" first time via our event filter. This seems to evade some
    // unexpected behavior under Windows.

    // If there was a countdown to hide the window, stop it.
    hideTimer.stop();
  }
}

void ScanPopup::requestWindowFocus()
{
  // One of the rare, actually working workarounds for requesting a user keyboard focus on X11,
  // works for Qt::Popup windows, exactly like our Scan Popup (in unpinned state).
  // Modern window managers actively resist to automatically focus pop-up windows.

}

void ScanPopup::showEvent( QShowEvent * ev )
{
  QMainWindow::showEvent( ev );

  QTimer::singleShot( 100, this, &ScanPopup::requestWindowFocus );

  if ( groups.size() <= 1 ) // Only the default group? Hide then.
    ui.groupList->hide();

  if ( ui.showDictionaryBar->isChecked() != dictionaryBar.isVisible() )
  {
    ui.showDictionaryBar->setChecked( dictionaryBar.isVisible() );
    updateDictionaryBar();
  }
}

void ScanPopup::closeEvent( QCloseEvent * ev )
{
  if( isVisible() && ui.pinButton->isChecked() )
    pinnedGeometry = saveGeometry();

  QMainWindow::closeEvent( ev );
}

void ScanPopup::moveEvent( QMoveEvent * ev )
{
  if( isVisible() && ui.pinButton->isChecked() )
    pinnedGeometry = saveGeometry();

  QMainWindow::moveEvent( ev );
}

void ScanPopup::prefixMatchFinished()
{
  // Check that there's a window there at all
  if ( isVisible() )
  {
    if ( wordFinder.getErrorString().size() )
    {
      ui.queryError->setToolTip( wordFinder.getErrorString() );
      ui.queryError->show();
    }
    else
      ui.queryError->hide();
  }
}

void ScanPopup::on_pronounceButton_clicked()
{
  definition->playSound();
}

void ScanPopup::pinButtonClicked( bool checked )
{
  if ( checked )
  {
    uninterceptMouse();

    ui.onTopButton->setVisible( true );
    Qt::WindowFlags flags = pinnedWindowFlags;
    if( ui.onTopButton->isChecked() )
      flags |= Qt::WindowStaysOnTopHint;
    setWindowFlags( flags );

#ifdef Q_OS_MACOS
    setAttribute(Qt::WA_MacAlwaysShowToolWindow);
#endif

    setWindowTitle( tr( "%1 - %2" ).arg( elideInputWord(), "GoldenDict" ) );
    dictionaryBar.setMovable( true );
    hideTimer.stop();
  }
  else
  {
    ui.onTopButton->setVisible( false );
    dictionaryBar.setMovable( false );
    setWindowFlags( unpinnedWindowFlags() );

#ifdef Q_OS_MACOS
    setAttribute(Qt::WA_MacAlwaysShowToolWindow, false);
#endif

    mouseEnteredOnce = true;
  }
  cfg.pinPopupWindow = checked;

  show();

  if( checked )
    pinnedGeometry = saveGeometry();
}

void ScanPopup::focusTranslateLine()
{
  if ( !isActiveWindow() )
    activateWindow();

  ui.translateBox->translateLine()->setFocus();
  ui.translateBox->translateLine()->selectAll();
}

void ScanPopup::on_showDictionaryBar_clicked( bool checked )
{
  dictionaryBar.setVisible( checked );
  updateDictionaryBar();
  definition->updateMutedContents();
}

void ScanPopup::hideTimerExpired()
{
  if ( isVisible() )
    hideWindow();
}

void ScanPopup::pageLoaded( ArticleView * )
{
  if( !isVisible() )
    return;
  auto pronounceBtn = ui.pronounceButton;
  definition->hasSound(
    [ pronounceBtn ]( bool has )
    {
      if( pronounceBtn )
        pronounceBtn->setDisabled( !has );
    } );

  updateBackForwardButtons();

  if ( cfg.preferences.pronounceOnLoadPopup )
    definition->playSound();
}

void ScanPopup::showStatusBarMessage( QString const & message, int timeout, QPixmap const & icon )
{
  mainStatusBar->showMessage( message, timeout, icon );
}

void ScanPopup::escapePressed()
{
  if ( !definition->closeSearch() )
    hideWindow();
}

void ScanPopup::hideWindow()
{
  uninterceptMouse();

  emit closeMenu();
  hideTimer.stop();
  unsetCursor();
  ui.translateBox->setPopupEnabled( false );
  ui.translateBox->translateLine()->deselect();
  hide();
}

void ScanPopup::interceptMouse()
{
  if ( !mouseIntercepted )
  {
    // We used to grab the mouse -- but this doesn't always work reliably
    // (e.g. doesn't work at all in Windows 7 for some reason). Therefore
    // we use a polling timer now.

//    grabMouse();
    mouseGrabPollTimer.start();

    qApp->installEventFilter( this );

    mouseIntercepted = true;
  }
}

void ScanPopup::mouseGrabPoll()
{
  if ( mouseIntercepted )
    reactOnMouseMove( QCursor::pos() );
}

void ScanPopup::uninterceptMouse()
{
  if ( mouseIntercepted )
  {
    qApp->removeEventFilter( this );
    mouseGrabPollTimer.stop();
//    releaseMouse();

    mouseIntercepted = false;
  }
}

void ScanPopup::updateDictionaryBar()
{
  if ( !dictionaryBar.toggleViewAction()->isChecked() )
    return; // It's not enabled, therefore hidden -- don't waste time

  unsigned currentId = ui.groupList->getCurrentGroup();
  Instances::Group const * grp = groups.findGroup( currentId );

  if ( grp ) // Should always be !0, but check as a safeguard
    dictionaryBar.setDictionaries( grp->dictionaries );

  if( currentId == Instances::Group::AllGroupId )
    dictionaryBar.setMutedDictionaries( &cfg.popupMutedDictionaries );
  else
  {
    Config::Group * grp = cfg.getGroup( currentId );
    dictionaryBar.setMutedDictionaries( grp ? &grp->popupMutedDictionaries : 0 );
  }

  setDictionaryIconSize();
}

void ScanPopup::mutedDictionariesChanged()
{
  updateSuggestionList();
  if ( dictionaryBar.toggleViewAction()->isChecked() )
    definition->updateMutedContents();
}

void ScanPopup::on_sendWordButton_clicked()
{
  if ( !isVisible() )
    return;
  if( !ui.pinButton->isChecked() )
  {
    definition->closeSearch();
    hideWindow();
  }
  emit sendPhraseToMainWindow( definition->getPhrase() );
}

void ScanPopup::on_sendWordToFavoritesButton_clicked()
{
  if ( !isVisible() )
    return;
  unsigned groupId   = ui.groupList->getCurrentGroup();
  auto current_exist = isWordPresentedInFavorites( definition->getTitle(), groupId );
  //if current_exist=false( not exist ),  after click ,the word should be in the favorite which is blueStar
  ui.sendWordToFavoritesButton->setIcon( !current_exist ? blueStarIcon : starIcon );
  emit sendWordToFavorites( definition->getTitle(), cfg.lastPopupGroupId, current_exist );
}

void ScanPopup::switchExpandOptionalPartsMode()
{
  if( isVisible() )
    emit switchExpandMode();
}

void ScanPopup::updateBackForwardButtons()
{
  ui.goBackButton->setEnabled(definition->canGoBack());
  ui.goForwardButton->setEnabled(definition->canGoForward());
}

void ScanPopup::on_goBackButton_clicked()
{
  definition->back();
}

void ScanPopup::on_goForwardButton_clicked()
{
  definition->forward();
}

void ScanPopup::setDictionaryIconSize()
{
  int extent = cfg.usingSmallIconsInToolbars ?
               QApplication::style()->pixelMetric( QStyle::PM_SmallIconSize ) :
               QApplication::style()->pixelMetric(QStyle::PM_ToolBarIconSize);
  dictionaryBar.setDictionaryIconSize( extent );
}

void ScanPopup::setGroupByName( QString const & name )
{
  int i;
  for( i = 0; i < ui.groupList->count(); i++ )
  {
    if( ui.groupList->itemText( i ) == name )
    {
      ui.groupList->setCurrentIndex( i );
      break;
    }
  }
  if( i >= ui.groupList->count() )
    gdWarning( "Group \"%s\" for popup window is not found\n", name.toUtf8().data() );
}

void ScanPopup::alwaysOnTopClicked( bool checked )
{
  bool wasVisible = isVisible();
  if( ui.pinButton->isChecked() )
  {
    Qt::WindowFlags flags = this->windowFlags();
    if( checked )
      setWindowFlags(flags | Qt::WindowStaysOnTopHint );
    else
      setWindowFlags(flags ^ Qt::WindowStaysOnTopHint );
    if( wasVisible )
      show();
  }
}

void ScanPopup::titleChanged( ArticleView *, QString const & title )
{
  unsigned groupId = ui.groupList->getCurrentGroup();

  // Set icon for "Add to Favorites" button
  ui.sendWordToFavoritesButton->setIcon( isWordPresentedInFavorites( title, groupId ) ?
                                         blueStarIcon : starIcon );
}

bool ScanPopup::isWordPresentedInFavorites( QString const & word, unsigned groupId ) const
{
  QString folder = GlobalBroadcaster::instance()->groupFolderMap[ groupId ];

  return GlobalBroadcaster::instance()->folderFavoritesMap[ folder ].contains( word );
}

#ifdef HAVE_X11
void ScanPopup::showScanFlag(){
  scanFlag->showScanFlag();
}

void ScanPopup::hideScanFlag(){
  scanFlag->hideWindow();
}
#endif