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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 ) {

Livingston: Who was involved Ross: David Hyatt, Joe Hewitt who is now my partner on a new startup,

This class is used to fill a DataSet class with data from a relational database. An in-memory representation of a database that can contain tables and relationships between them; unlike the other class in this table, this class is concrete and can be used directly.

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Parakey and I were on the development side, with Brian Ryner and Asa Dotzler providing build and QA support. The project was like an afterthought for the first 6 months to a year, something we worked on at Denny s after work. I went back home to Miami, and we worked on it online for a while. Phoenix was basically a fork of the Mozilla code base that we controlled. We closed off access to the code, because we felt it was impossible to create anything consumer-oriented when you had a thousand Netscape people in search of revenue and a thousand open source geeks who shunned big business trying to reach consensus. We just wanted to close it off and do what we thought was the right thing. We went through a couple name changes, Mozilla offered us more support, and that s kind of how it all got started.

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.

Livingston: What were some of the other names Ross: It started off as Phoenix, and we quickly encountered trademark issues. It

The classes in Table 9-2, with the exception of System.Data.DataSet, are all abstract, so you must use concrete implementations of them. For example, here you create an instance of System.Data.SqlClient.SqlConnection, which is an implementation of System.Data.Common. DbConnection, which gives access to a SQL Server database: using (new SqlConnection(connectionString)) If you wanted to access an Oracle database, you would simply replace the SqlConnection class with the OracleConnection class. Table 9-3 summarizes some of the most popular libraries and namespaces that implement these classes, although this table is incomplete because the range of providers is large. Table 9-3. Database Providers for .NET

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