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These are relatively minor changes. A more ambitious view could link to a style that changes the control template that s used for the ListView, modifying it much more dramatically. This is where you begin to see the benefits of the view model. By changing a single property in the ListView, you can apply a combination of related settings through two styles. The TileView style that applies to the ListViewItem changes a few other details. It sets the padding and content alignment and, most important, sets the DataTemplate that s used to display content. Here s the full markup for this style: <Style x:Key="{ComponentResourceKey TypeInTargetAssembly={x:Type local:TileView}, ResourceId=TileViewItem}" TargetType="{x:Type ListViewItem}" BasedOn="{StaticResource {x:Type ListBoxItem}}"> <Setter Property="Padding" Value="3"/> <Setter Property="HorizontalContentAlignment" Value="Center"></Setter> <Setter Property="ContentTemplate" Value="{Binding Path=View.ItemTemplate, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type ListView} }}"></Setter> </Style> Remember that to ensure maximum flexibility, the TileView is designed to use a data template that s supplied by the developer. To apply this template, the TileView style needs to retrieve the TileView object (using the ListView.View property) and then pull the data template from the TileView.ItemTemplate property. This step is performed using a binding expression that searches up the element tree (using the FindAncestor RelativeSource mode) until it finds the containing ListView.

Figure 4-7. The xmldap.org identity selector On first use, there are no information cards stored, so the user is prompted to create or import a new card. The xmldap.org identity selector has support for both personal/self-issued cards and managed cards, as shown in Figure 4-8.

Note Rather than setting the ListViewItem.ContentTemplate property, you could achieve the same result by

Once you ve built your view class and the supporting styles, you re ready to put them to use in a ListView control. To use a custom view, you simply need to set the ListView.View property to an instance of your view object, as shown here: <ListView Name="lstProducts"> <ListView.View> <TileView ... > </ListView.View> </ListView>

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However, this example demonstrates a ListView that can switch between three views. As a result, you need to instantiate three distinct view objects. The easiest way to manage this is to define each view object separately in the Windows.Resources collection. You can then load the view you want when the user makes a selection from the ComboBox control, by using this code: private void lstView_SelectionChanged(object sender, SelectionChangedEventArgs e) { ComboBoxItem selectedItem = (ComboBoxItem)lstView.SelectedItem; lstProducts.View = (ViewBase)this.FindResource(selectedItem.Content); } The first view is simple enough it uses the familiar GridView class that you considered earlier to create a multicolumn display. Here s the markup it uses: <GridView x:Key="GridView"> <GridView.Columns> <GridViewColumn Header="Name" DisplayMemberBinding="{Binding Path=ModelName}" /> <GridViewColumn Header="Model" DisplayMemberBinding="{Binding Path=ModelNumber}" /> <GridViewColumn Header="Price" DisplayMemberBinding="{Binding Path=UnitCost, StringFormat={}{0:C}}" /> </GridView.Columns> </GridView> The two TileView objects are more interesting. Both of them supply a template to determine what the tile looks like. The ImageView (shown in Figure 22-3) uses a StackPanel that stacks the product image above the product title: <local:TileView x:Key="ImageView"> <local:TileView.ItemTemplate> <DataTemplate> <StackPanel Width="150" VerticalAlignment="Top"> <Image Source="{Binding Path=ProductImagePath, Converter={StaticResource ImagePathConverter}}"> </Image> <TextBlock TextWrapping="Wrap" HorizontalAlignment="Center" Text="{Binding Path=ModelName}"></TextBlock> </StackPanel> </DataTemplate> </local:TileView.ItemTemplate> </local:TileView> The ImageDetailView uses a two-column grid. A small version of the image is placed on the left, and more detailed information is placed on the right. The second column is placed into a shared size group so that all the items have the same width (as determined by the largest text value). <local:TileView x:Key="ImageDetailView"> <local:TileView.ItemTemplate> <DataTemplate> <Grid> <Grid.ColumnDefinitions> <ColumnDefinition Width="Auto"></ColumnDefinition>

<ColumnDefinition Width="Auto" SharedSizeGroup="Col2"></ColumnDefinition> </Grid.ColumnDefinitions> <Image Margin="5" Width="100" Source="{Binding Path=ProductImagePath, Converter={StaticResource ImagePathConverter}}"> </Image> <StackPanel Grid.Column="1" VerticalAlignment="Center"> <TextBlock FontWeight="Bold" Text="{Binding Path=ModelName}"></TextBlock> <TextBlock Text="{Binding Path=ModelNumber}"></TextBlock> <TextBlock Text="{Binding Path=UnitCost, StringFormat={}{0:C}}"> </TextBlock> </StackPanel> </Grid> </DataTemplate> </local:TileView.ItemTemplate> </local:TileView> This is undoubtedly more code than you wanted to generate to create a ListView with multiple viewing options. However, the example is now complete, and you can easily create additional views (based on the TileView class) that supply different item templates and give you even more viewing options.

Figure 4-8. xmldap.org s identity selector includes managed card support. Next, the user must specify the card location, as shown in Figure 4-9.

Plain Old CLR Objects, and their vanilla properties, are perfectly acceptable binding sources. Although added functionality will be required of our POCOs to support features like change notification POCOs are used for ViewModel implementation throughout this book. Databinding is acceptable on the properties, subproperties, and indexers of objects. You can even supply the object itself as the binding source, which, as we will see, is much more useful than it first appears.

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