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In 11, you learned how styles allow you to reuse formatting with similar elements in different places Styles play much the same role with lists they allow you to apply a set of formatting characteristics to each of the individual items This is important, because WPF s data binding system generates list item objects automatically As a result, it s not so easy to apply the formatting you want to individual items The solution is the ItemContainerStyle property If the ItemContainerStyle is set, the list control will pass it down to each of its items, as the item is created In the case of a ListBox control, each item is represented by a ListBoxItem object (In a ComboBox, it s ComboBoxItem, and so on) Thus, any style you apply with the ListBoxItemContainerStyle property is used to set the properties of each ListBoxItem object.

Here s one of the simplest possible effects that you can achieve with the ListBoxItem It applies a blue-gray background to each item To make sure the individual items stand apart from each other (rather than having their backgrounds merge together, the style also adds some margin space: <ListBox Name="lstProducts" Margin="5" DisplayMemberPath="ModelName"> <ListBoxItemContainerStyle> <Style> <Setter Property="ListBoxItemBackground" Value="LightSteelBlue" /> <Setter Property="ListBoxItemMargin" Value="5" /> <Setter Property="ListBoxItemPadding" Value="5" /> </Style> </ListBoxItemContainerStyle> </ListBox> On its own, this isn t terribly interesting However, the style becomes a bit more polished with the addition of triggers In the following example, a property triggers changes the background color and adds a solid border when the ListBoxItemIsSelected property becomes true Figure 20-5 shows the result <ListBox Name="lstProducts" Margin="5" DisplayMemberPath="ModelName"> <ListBoxItemContainerStyle> <Style TargetType="{x:Type ListBoxItem}"> <Setter Property="Background" Value="LightSteelBlue" /> <Setter Property="Margin" Value="5" /> <Setter Property="Padding" Value="5" /> <Style.

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INotifyCollectionChanged is similar to the INotifyPropertyChanged interface, but it applies to collections of objects rather than a single property. INotifyCollectionChanged is part of the Systems.Collections.Specialized namespace, as of .NET Framework 3.0. The CollectionChanged event uses the NotifyCollectionChangedEventHandler delegate, which accepts a sender object and a NotifyCollectionChangedEventArgs instance. All are shown in Listing 4 9. Listing 4 9. The CollectionChanged Event, NotifyCollectionChangedEventHandler, and the CollectionChangedEventArgs event NotifyCollectionChangedEventHandler CollectionChanged public delegate void NotifyCollectionChangedEventHandler( Object sender, NotifyCollectionChangedEventArgs e ) Unlike a property, whose value is simply different from what it previously was, there are a number of ways that a collection can change. The event will be fired for any of the change types, and the manner in which the collection changes is dictated by the NotifyCollectionChangedEventArgs.Action property one of the values of the NotifyCollectionChangedAction enumeration (see Table 4 1). Table 4 1. The Values of the NotifyCollectionChangedAction Enumeration and Their Respective Meanings

Triggers> <Trigger Property="IsSelected" Value="True"> <Setter Property="Background" Value="DarkRed" /> <Setter Property="Foreground" Value="White" /> <Setter Property="BorderBrush" Value="Black" /> <Setter Property="BorderThickness" Value="1" /> </Trigger> </StyleTriggers> </Style> </ListBoxItemContainerStyle> </ListBox>.

You saw that CardSpace provides functionality on the client to create, store, and select cards In addition, you learned that WCF provides the ability to provide services that will trigger the CardSpace identity selector, as well as generate client applications that can interact with services that require certain claims be satisfied You also saw the support that was added in Internet Explorer 7 by Microsoft and learned of third-party support for other browsers such as Mozilla Firefox The result is that any website can generate HTML that triggers the identity selector on the server and processes CardSpacedelivered tokens With all that covered, it s now time to start writing some code You ll begin with using CardSpace with WCF in 4 and then move on to using it within the browser in 5.

For cleaner markup, this style uses the Style.TargetType property so that it can set properties without including the class name in each setter.

This use of triggers is particularly handy, because the ListBox doesn t provide any other way to apply targeted formatting to the selected item. In other words, if you don t use a style, you re stuck with the standard blue highlighting. Later in this chapter, when you use data templates to completely revamp data lists, you ll once again rely on the ItemContainerStyle to change the selected item effect.

The ItemContainerStyle is also important if you want to reach deep into a list control and change the control template that its items use. For example, you can use this technique to make every ListBoxItem display a radio button or a check box next to its item text. Figure 20-6 and Figure 20-7 show two examples one with a list filled with RadioButton elements (only one of which can be chosen at a time) and one with a list of CheckBox elements. The two solutions are similar, but the list with radio buttons is slightly easier to create.

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