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Converting an old plugin to the new interface is easy. Just put the name in a QStringList before returning it from names and then ignore the filter name argument in the filter method. Extending an old plugin is almost as easy. Return several names from the names method and determine which filter to use in the filter method by using the filter name argument. The Flip filter covered in Listings 11-17 to 11-21 has been extended to support flipping both horizontally and vertically. The small change has been made in the names method shown in Listing 11-31. It now returns two QStrings, one for each filter. Listing 11-31. Returning several names using a QStringList QStringList Flip::names() const { return QStringList() << "Flip Horizontally" << "Flip Vertically"; } The filter method is shown in Listing 11-32. The highlighted line shows where the filter argument is evaluated to determine what to do. Notice that if an unexpected filter name is given, the filter will perform a vertical flip. Although it is probably not what the user expects, it will keep the application running so it is a good way to handle it because there is no specified solution to the problem. Perhaps an invalid QImage could have been returned instead, but the entire discussion is about how an application bug will show itself (so it is not worth wasting too much energy on the problem). Much better to ensure that there is no such bug in the application! Listing 11-32. The filter acts differently depending on the filter argument. QImage Flip::filter( const QString &filter, const QImage &image ) const { bool horizontally = (filter=="Flip Horizontally"); QImage result( image.width(), image.height(), image.format() ); for( int y=0; y<image.height(); ++y ) for( int x=0; x<image.width(); ++x ) result.setPixel( horizontally x:(image.width()-1-x),

Week number of the year (with Sunday as the first day of the week) as a decimal number [00,53]. All days in a new year preceding the first Sunday are considered to be in week 0. Weekday as a decimal number [0(Sunday),6]. Week number of the year (with Monday as the first day of the week) as a decimal number [00,53]. All days in a new year preceding the first Monday are considered to be in week 0. Locale s appropriate date representation. Locale s appropriate time representation. Year without century as a decimal number [00,99]. Year with century as a decimal number. Time zone name (no characters if no time zone exists). A literal % character.

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Key escrow techniques: Abelson et al 1998; Balenson et al 1994; Bellare and Goldwasser 1997; Blaze 2002; Denning 1995; Denning and Branstad 1996; Kilian and Leighton 1995; Knudsen and Pedersen 1996; Lenstra, Winkler, and Yacobi 1995; Nechvatal 1996; Shamir 1995; Walker 1994; Walker et al 1995 Digital signatures: Davies 1983; Davies and Price 1980; Davies and Price 1984; Matyas 1979; Merkle 1990; Mitchell, Piper, and Wild 1992; Rabin 1978; Rabin 1979; Rivest, Shamir, and Adelman 1978 Byzantine agreement protocol: Castro and Liskov 1999a; Castro and Liskov 1999b; Dolev et al.

Note How can you tell that the ToolTip event is sent as a QHelpEvent object Look at the documentation for the enum QEvent::Type; you ll see a list of all event types and the type of objects passed along such an event.

%x %X %y %Y %Z %%

After the event object has been cast into a QHelpEvent object, the rectangles for the four zones are set up. Then the tooltip is set depending on which rectangle contains the point returned by the pos() method of the QHelpEvent object. When the tooltip text has been set, do not mark the event as accepted. Instead call the default handler (because it knows how to show the actual tooltip) by calling the parent s handler QWidget::event. This is where all the non-ToolTip events go as well making sure that everything works as expected. Listing 9-5. Intercepting all ToolTip events and updating the tooltip text before passing it on to the default handler bool TipZones::event( QEvent *event ) { if( event->type() == QEvent::ToolTip ) { QHelpEvent *helpEvent = static_cast<QHelpEvent*>( event ); QRect redRect, greenRect, blueRect, yellowRect; redRect = QRect( 0, 0, width()/2, height()/2 ); greenRect = QRect( width()/2, 0, width()/2, height()/2 ); blueRect = QRect( 0, height()/2, width()/2, height()/2 ); yellowRect = QRect( width()/2, height()/2, width()/2, height()/2 ); if( redRect.contains( helpEvent->pos() ) ) setToolTip( tr("Red") ); else if( greenRect.contains( helpEvent->pos() ) ) setToolTip( tr("Green") ); else if( blueRect.contains( helpEvent->pos() ) ) setToolTip( tr("Blue") ); else setToolTip( tr("Yellow") ); } return QWidget::event( event ); }

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