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// define easier access to LINQ methods let select f s = Sequence.Select(s, new Func<_,_>(f)) let where f s = Sequence.Where(s, new Func<_,_>(f)) let groupBy f s = Sequence.GroupBy(s, new Func<_,_>(f)) let orderBy f s = Sequence.OrderBy(s, new Func<_,_>(f)) let count s = Sequence.Count(s) Once these functions have been imported, they can easily be applied, typically using the pipe forward operator. The following example demonstrates this. It uses the LINQ library to query the string class and group the overloads of its nonstatic methods together. // query string methods using functions let namesByFunction = (type string).GetMethods() |> where (fun m -> not m.IsStatic) |> groupBy (fun m -> m.Name) |> select (fun m -> m.Key, count m) |> orderBy (fun (_, m) -> m) namesByFunction |> Seq.iter (fun (name, count) -> printfn "%s - %i" name count) The results are as follows: ToLowerInvariant - 1 TrimEnd - 1 GetHashCode - 1 TrimStart - 1 GetEnumerator - 1 GetType - 1 GetTypeCode - 1 ToUpperInvariant - 1 Clone - 1 CopyTo - 1 get_Length - 1 Insert - 1 get_Chars - 1 PadLeft - 2 CompareTo - 2 PadRight - 2 ToUpper - 2 ToLower - 2 ToString - 2 Trim - 2 Remove - 2 ToCharArray - 2 Substring - 2 IsNormalized - 2

Listing 5-15. Initializing the editor widget according to the model value void BarDelegate::setEditorData( QWidget *editor, const QModelIndex &index ) const { int value = index.model()->data( index, Qt::DisplayRole ).toInt(); static_cast<QSlider*>( editor )->setValue( value ); } The editor widget can be created, placed, and sized correctly, and then get initialized with the current value. The user can then edit the value in a meaningful way, but there is no way for the new value to get to the model. This is the task handled by setModelData(QWidget*, QAbstractItemModel*, const QModelIndex&). You can see the method in Listing 5-16. The code is fairly straightforward, even if it is slightly obscured by a cast. What happens is that the value from the editor widget is taken and used in a setData(const QModelIndex&, const QVariant&, int) call. The affected model index, index, is passed to the setModelData method as an argument, so there are no real hurdles left. Listing 5-16. Getting the value from the editor widget and updating the model void BarDelegate::setModelData( QWidget *editor, QAbstractItemModel *model, const QModelIndex &index ) const { model->setData( index, static_cast<QSlider*>( editor )->value() ); } The resulting application shows values as bars and enables the user to edit them using a slider. (Refer to Figure 5-6 for the running application.)

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been grassroots, word of mouth, done through Spread Firefox. It s been interesting because we ve seen about a dozen companies adopt the same model since then. There s GoTrillian.com, SpreadOpenOffice.org there are all these different copycat sites.

Livingston: Was there ever a point when you were really worried Ross: Not really. But I m making it seem like startups are so stress-free, and of

When you feel that you can t get to where you want by using the available views, delegates, or any other tricks, you face a situation in which you have to implement a view of your own. Figure 5-7 shows a table and a custom view showing the selected item. The custom view shows a single item at a time (or a text explaining it if more than one item is selected at a time). It is based around a QAbstractItemView and uses a QLabel for showing the text.

Normalize - 2 Replace - 2 IndexOfAny - 3 EndsWith - 3 Equals - 3 StartsWith - 3 LastIndexOfAny - 3 Split - 6 LastIndexOf - 9 IndexOf - 9

course that s just not true. It s just really freeing not to be . . . We weren t trying to strike it rich with Firefox. It s open source and it s free. We weren t trying to take over the world; we had kind of modest goals, and it was OK if it failed. We were a lot freer to make risky decisions. If you can afford to do things that way, it s just so much better. You re not thinking about venture capitalists or marketing or sales. Just product and users, all day every day.

Livingston: You were pretty young when you worked on Firefox. Was there anything you found you were better at than you thought Ross: I thought marketing was something that required a degree and formal

When implementing a custom view, you must provide implementations of a whole bunch of methods. Some methods are important; others just provide a valid return value. Which methods need a complex implementation largely depends on the type of view you are implementing. In Listing 5-17, you can see the class declaration of the custom view SingleItemView. All methods except updateText() are required because they are declared as pure abstract methods in QAbstractItemView.

The goal of LINQ to XML is to provide an XML object model that works well with LINQ s functional style of programming. Table 9-4 summarizes the important classes within this namespace. Table 9-4. A Summary of the Classes Provided by LINQ to XML

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