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... </Button> </Grid> <Grid...> ... <TextBox x:Name="tbxTitle" Text="{Binding Path=CurrentNote.Title, Mode=TwoWay}" TextWrapping="NoWrap"...> ... </TextBox> <TextBox x:Name="tbxBody" Text="{Binding Path=CurrentNote.Body, Mode=TwoWay}" TextWrapping="Wrap" AcceptsReturn="True"...> ... </TextBox> </Grid> <controls:TreeView x:Name="NotesTree" ItemsSource="{Binding Path=NotesByDate, Mode=OneWay}" ItemTemplate="{StaticResource dtDateItem}"...> ... </controls:TreeView> <Grid ...> <Ellipse x:Name="signNoNetwork" Fill="#FFFF0000" Visibility="{Binding Path=NetworkOn,Mode=OneWay, Converter={StaticResource REF_BoolToVisibilityConverter}, ConverterParameter='reverse'}".../> <Ellipse x:Name="signNetworkOn" Fill="#FF75FF00" Visibility="{Binding Path=NetworkOn,Mode=OneWay, Converter={StaticResource REF_BoolToVisibilityConverter}}"... /> </Grid> </Grid> </UserControl> The first thing to note in the XAML in Listing 8-5 is that the DataContext for the top level UserControl is bound to the MainPage code-behind class using the RelativeSource.Self enumerated value. This allows the rest of the UI to bind to properties defined directly on the MainPage class, without having to resort to defining separate data-class types for the most part. For more details about RelativeSource binding, refer to 4. The TreeView control instance named NotesTree displays currently stored notes. NotesTree.ItemsSource is bound to a property named NotesByDate of type ObservableCollection<TreeNodeData>, where TreeNodeData is a data class representing a top-level item in the TreeView. Listing 8-6 shows the TreeNodeData class.

Listing 8-6. TreeNodeData Data Class in MainPage.xaml.cs //Represents a top level node (Date) in the tree view //with children nodes (Note) public class TreeNodeData : INotifyPropertyChanged { public event PropertyChangedEventHandler PropertyChanged; private DateTime _Date = default(DateTime); public DateTime Date { get { return _Date; } set { if (value != _Date) { _Date = value; if (PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs("Date")); } } } private ObservableCollection<Note> _Notes = default(ObservableCollection<Note>); public ObservableCollection<Note> Notes { get { return _Notes; } set { if (value != _Notes) { _Notes = value; if (PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs("Notes")); } } } }

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To build the menu bar in banner.zul, you simply declare a menubar component and its children, menuitem components. One thing to remember is that the style component could be used in any kind of UI component to define the component s style. In Listing 6-6, the style of the menu bar is defined directly within the style property of menubar. In addition, within each menuitem component, there are two properties: label sets the text on it, and href sets its corresponding hyperlink.

Note that the TreeNodeData class is hierarchical in nature, in that each instance contains a Date property that defines the data at that level and a Notes property of type ObservableCollection <Note> that defines the data collection for the sublevel Referring back to Listing 8-5, observe the use of the HierarchicalDataTemplate type to define the UI for the top-level nodes of NotesTree A HierarchicalDataTemplate is an extension of the data-template type meant to be used with hierarchical data sets such as the ones defined by a collection of TreeNodeData instances It provides for data-template chaining that lets you define a data template for multiple levels of a hierarchical data set In addition to binding a data item to a HierarchicalDataTemplate, you can set the ItemTemplate and ItemsSource properties of the template.

The HierarchicalDataTemplate then applies the data template in the ItemTemplate property to each element in the collection bound to the ItemsSource In the example, dtDateItem is a HierarchicalDataTemplate containing the necessary XAML to display the dates as the top-level nodes; it is bound to TreeNodeData, defined in Listing 8-6 The ItemTemplate property on dtDateItem is set to use the dtNoteItem data template, whereas its ItemsSource is bound to the TreeNodeDataNotes property This causes every Note instance in the Notes collection to use the dtNoteItem data template and be displayed as children to the corresponding date item in the TreeView Note that there is no system-enforced limit on this kind of chaining Unlike in the example, if you need more levels in the hierarchy and you have a data structure that supports such nesting, you can use additional HierarchicalDataTemplates as children.

When you reach a level at which you no longer need children items, you can resort to a simple DataTemplate The rest of the XAML is self-explanatory The buttons on the UI serve different functions that we look at a moment when we explore the codebehind The tbxTitle and tbxBody TextBoxes are bound to the Title and the Body properties of the CurrentNote property of the MainPage class, and the signNoNetwork and signNetworkOn ellipses are colored red and green and are both bound to the MainPageNetworkOn property to be made visible conditionally depending on the value of the NetworkOn property A ValueConverter converts bool to the Visibility type for these bindings Before we look at the main application codebehind, let s cover one more aspect of the sample.

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