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Because the widget is painted by the code, the paintEvent needs to be reimplemented. You will also need to reimplement the wheelEvent because you want to listen to mouse wheel activity. I chose to add a heightForWidth function, which will be used to keep the widget square, and a sizeHint method that gives it a nice starting size. All this is summarized in the class declaration shown in Listing 6-19. Listing 6-19. The class declaration of the CircleBar widget class class CircleBar : public QWidget { Q_OBJECT public: CircleBar( int value = 0, QWidget *parent = 0 ); int value() const; int heightForWidth( int ) const; QSize sizeHint() const; public slots: void setValue( int ); signals: void valueChanged( int ); protected: void paintEvent( QPaintEvent* ); void wheelEvent( QWheelEvent* ); private: int m_value; }; The constructor of the CircleBar class shown in Listing 6-20 starts by initializing the internal value that is kept in the m_value member. It also creates a new size policy that is preferred in both directions and tells the layout management system to listen to the heightForWidth method. Listing 6-20. The constructor of the CircleBar widget CircleBar::CircleBar( int value, QWidget *parent ) : QWidget( parent ) { m_value = value; QSizePolicy policy( QSizePolicy::Preferred, QSizePolicy::Preferred ); policy.setHeightForWidth( true ); setSizePolicy( policy ); }

Sometimes it is useful to be able to cache template calls to speed up performance As you ve seen, the render_mako() function has a number of options to support this, each of which defaults to None if it is not specified: cache_key: This is the key to cache this copy of the template under cache_type: This is the cache type Valid options are dbm, file, memory, database, or memcached cache_expire: This is the time in seconds to cache this template with this cache_key Or use never to designate that the cache should never expire These options are then used, along with the template name, to cache the result of the call to the render_template() function I ve just described The caching functionality comes from the Beaker package and is described in detail at http://docspylonshqcom/cachinghtml.

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ryptography is the study of how to mathematically encode and decode messages The objective of this chapter and the next is to show you how to use cryptography as a tool to achieve some of the security goals we discussed in 1 A cryptographic primitive is an algorithm that can be used to, for example, encode or decode a message In this chapter and the next, you ll see how to use cryptographic primitives to achieve authentication, confidentiality, and message integrity Our focus will be to show how cryptographic primitives can be used to achieve security goals That is, we will focus on applied cryptography, and how to put cryptographic primitives to practical use Using cryptographic primitives correctly is tricky business When used correctly, cryptographic primitives can help improve the security of a software application.

The size policy is accompanied by the heightForWidth(int) method and the sizeHint method returning the preferred widget size. The implementation of these methods is shown in Listing 6-21. The heightForWidth method takes a width as argument and returns the wanted height to the layout manager. The implementation used in the CircleBar class returns the given width as height, resulting in a square widget. Listing 6-21. The size handling methods int CircleBar::heightForWidth( int width ) const { return width; } QSize CircleBar::sizeHint() const { return QSize( 100, 100 ); } The methods for handing the values value() and setValue are shown in Listing 6-22. The value method is simple it simply returns m_value. The setValue method limits the value to the range 0 100 before checking whether a change has taken place. If so, m_value is updated before a call to update is made and the valueChanged signal is emitted. By calling update(), a repaint event is triggered, which causes a call to paintEvent. Remember that you can t draw the widget outside the paintEvent method. Instead, call update and then handle the painting from the paintEvent method. Listing 6-22. Handing the value of the CircleBar widget int CircleBar::value() const { return m_value; } void CircleBar::setValue( int value ) { if( value < 0 ) value = 0; if( value > 100 ) value = 100; if( m_value == value ) return; m_value = value;

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