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Once the RSS and News Reader blocks are connected, clicking the wrench icon to configure the News Reader block reveals what s shown in Figure 7-6: the source is the RSS block, and the headline, date, content, and fullStoryUrl operation input fields of the News Reader block s addNewsItem function are associated with the respective title, publishedDate, description, and link fields from the RSS block.

Both networking, which occurs when you connect several computers together so that they can communicate, and internetworking, which links adjacent networks together to form a much larger system like the Internet, are essentially just elaborate schemes to allow resource sharing All sorts of things in a computer, of course, need to be shared: disk drives, memory, and the CPU are all carefully guarded by the operating system so that the individual programs running on your computer can access those resources without stepping on each other s toes The network is yet another resource that the operating system needs to protect so that programs can communicate with one another without interfering with other conversations that happen to be occurring on the same network.

Listing 5-9. The class declaration of the custom delegate class BarDelegate : public QAbstractItemDelegate { public: BarDelegate( QObject *parent = 0 ); void paint( QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index ) const; QSize sizeHint( const QStyleOptionViewItem &option, const QModelIndex &index ) const; }; The sizeHint method is shown in Listing 5-10. It simply returns a size that is large enough yet doesn t exceed the size limitations. Remember that this is just a hint; the real size can be changed by Qt for layout issues or by the user by adjusting the size of rows and columns. Listing 5-10. Returning a size hint for the custom delegate QSize BarDelegate::sizeHint( const QStyleOptionViewItem &option, const QModelIndex &index ) const { return QSize( 45, 15 ); } The sizeHint method is very straightforward; the paint method is more interesting (see Listing 5-11). The first if statement checks whether the item is selected by testing the state of the style option. (Style options are used to control the appearance of everything in Qt applications.) The styling system responsible for making Qt applications look like native applications uses style option objects for palettes, areas, visual states, and everything else that affects the appearance of objects on the screen. There are numerous style object classes almost one for every graphical element. All inherit the QStyleOption class. Listing 5-11. Painting the value for the custom delegate void BarDelegate::paint( QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index ) const { if( option.state & QStyle::State_Selected ) painter->fillRect( option.rect, option.palette.highlight() ); int value = index.model()->data( index, Qt::DisplayRole ).toInt(); double factor = (double)value/100.0; painter->save(); if( factor > 1 ) {

The physical networking devices that your computer uses to communicate like Ethernet cards, wireless transmitters, and USB ports are themselves each designed with an elaborate ability to share a single physical medium among many different devices that want to communicate A dozen Ethernet cards might be plugged into the same hub; thirty wireless cards might be sharing the same radio channel; and a DSL modem uses frequency-domain multiplexing, a fundamental concept in electrical engineering, to keep its own digital signals from interfering with the analog signals sent down the line when you talk on the telephone The fundamental unit of sharing among network devices the currency, if you will, in which they trade is the packet A packet is a binary string whose length might range from a few bytes to a few thousand bytes, which is transmitted as a single unit between network devices.

painter->setBrush( Qt::red ); factor = 1; } else painter->setBrush( QColor( 0, (int)(factor*255), 255-(int)(factor*255) ) ); painter->setPen( Qt::black ); painter->drawRect( optionrectx()+2, optionrecty()+2, (int)(factor*(optionrectwidth()-5)), optionrectheight()-5 ); painter->restore(); } If the style option indicates that the item is selected, the background is filled with the platform s selected background color that you also get from the style option For drawing, use the QPainter object and the fillRect(const QRect&, const QBrush&) method that fills a given rectangle The next line picks the value from the model and converts it to an integer The code requests the value with the DisplayRole for the index Each model item can have data for several different roles, but the value to be shown has the DisplayRole The value is returned as a QVariant.

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