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For the really simple lists, Qt offers the QStringListModel. Because lists of items are often kept in QStringList objects in Qt applications, it s nice to have a model that takes a string list and works with all views. Listing 5-8 shows how the QStringList object list is created and populated. A QStringListModel is created, and the list is set with setStringList(const QStringList&). Finally, the list is used in the list view. Listing 5-8. Using the QStringListModel to populate a QListView QListView list; QStringListModel model; QStringList strings; strings << "Huey" << "Dewey" << "Louie"; model.setStringList( strings ); list.setModel( &model );

You will notice, in Figure 7-4, the object named RSSFeed. It is used by the operation getFeed. RSSFeed represents the XML returned by the operation getFeed about the current feed used by the block. Figure 7-5 shows the RSS block being connected to the News Reader block. After the getItems operation has been selected and configured the object that will be sent to the News Reader through the connection will be the RSSItem object.

You should at least read lots of war stories about how intrusions have occurred, whether from security alerts or on popular blogs; then you will know ahead of time to forearm your code against the same kinds of disasters Plus, such accounts are also quite entertaining if you like to learn the details of how systems work and to learn about the unending cleverness of those who want to subvert them..

Being able to show models through existing views can be useful, but sometimes you need to be able to customize the views to your own needs. There are two approaches to this: either build a delegate from the QAbstractItemDelegate class or create a completely custom view from the QAbstractItemView class. Creating a delegate is the easiest approach, so start there. The views shipped with Qt all use delegates to draw and edit its items. By creating a delegate for drawing a row or a column or all items in a view you can usually get the look and feel that you need.

attention to the topic of catching network errors as we go forward through this book, especially in the chapters of this first section, with their emphasis on low-level networking. And for our final point, we reach the topic that will occupy us for the rest of this first section of the book: the fact that the socket() interface used in search4.py is not, in fact, the lowest protocol level in play when you make this request to Google! Just as our example has network protocols operating above the level above raw sockets, so also there are protocols down beneath the sockets abstraction that Python cannot see because your operating system manages them instead. The layers operating below the socket() API are the following: The Transmission Control Protocol (TCP), which sockets use to support network conversations between two programs The Internet Protocol (IP), which knows how to send small messages call packets between different computers The link layer, at the very bottom, which consists of network hardware devices like Ethernet ports and wireless cards, which can send physical messages between directly-linked computers

Start by creating a delegate to show integer values as a bar. The delegate can be seen in action in the table view shown in Figure 5-5. The bars range from 0 100, where 0 is just a thin line in blue, and 100 is a full green bar. If the value exceeds 100, the bar turns red to indicate that it is out of range.

Through the rest of this chapter, and in the two chapters that follow, we will explore these lowest protocol levels. We will start by examining the IP level, and then proceed in the following chapters to see how two quite different protocols UDP and TCP support the two basic kinds of conversation that are possible between applications on a pair of Internet-connected hosts.

Figure 5-5. The BarDelegate class is used to show integer values as bars. Because it is a delegate for showing bars, the new class is called BarDelegate and is built on the QAbstractItemDelegate class. The abstract item delegate class is the base class of all delegates. The class declaration is shown in Listing 5-9. The code can be considered a boilerplate for all delegates managing the showing of values because both methods to override are clearly stated in the documentation for the QAbstractItemDelegate base class. The purpose of the method is easy to guess from its name. The paint(QPainter*, const QStyleOptionViewItem&, const QModelIndex&) method draws the item, whereas sizeHint(const QStyleOptionViewItem&, const QmodelIndex&) indicates how large the each item wants to be.

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