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The view model implements the INotifyProperty Changed interface indirectly through the Notification Object class from the Prism Library.
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Define your data bindings to the view model in the view s XAML.
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The following code example shows the DataContext attribute and some of the control definitions in the AppSettingsView.xaml file. Tailspin chose to use the ToggleSwitch control in place of a standard CheckBox control because it better conveys the idea of switching something on and off instead of selecting something. The Toggle Switch control is part of the Microsoft Silverlight Windows Phone Toolkit available on the Silverlight Toolkit CodePlex site (http:// silverlight.codeplex.com).
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XAML <phone:PhoneApplicationPage x:Class="TailSpin.PhoneClient.Views.AppSettingsView" DataContext="{Binding Source={StaticResource ViewModelLocator}, Path=AppSettingsViewModel}" > <TextBox Height="Auto" HorizontalAlignment="Stretch" Margin="0,28,0,0" Name="textBoxUsername" VerticalAlignment="Top" Width="Auto" Text="{Binding UserName, Mode=TwoWay}" Padding="0" BorderThickness="3"> <i:Interaction.Behaviors> <prism:UpdateTextBindingOnPropertyChanged/> </i:Interaction.Behaviors> </TextBox> <PasswordBox Height="Auto" HorizontalAlignment="Stretch" Margin="0,124,0,0" Name="passwordBoxPassword" VerticalAlignment="Top" Width="Auto" Password="{Binding Password, Mode=TwoWay}"> <i:Interaction.Behaviors> <prism:UpdatePasswordBindingOnPropertyChanged/> </i:Interaction.Behaviors> </PasswordBox> <toolkit:ToggleSwitch Header="Subscribe to Push Notifications" Margin="0,202,0,0" IsChecked="{Binding SubscribeToPushNotifications, Mode=TwoWay}" /> <ProgressBar Height="4" HorizontalAlignment="Stretch"
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The default binding mode value is OneWay, which is the setting used by the ProgressBar control. You need to change this to TwoWay if you want to send the changes back to the view model.
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Name="progressBar" VerticalAlignment="Bottom" IsIndeterminate= {Binding IsSyncing} />
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The view model class must implement the INotifyProperty Changed interface for automatic updates in the view to work. In the Tailspin client application, this interface is implemented by the View Model class that all the view models inherit from. A view model notifies a view of a changed property value by invoking one of the RaisePropertyChanged methods. The following code example shows how the AppSettingsViewModel view model class notifies the view that it should display the in-progress indicator to the user.
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C# public bool IsSyncing { get { return this.isSyncing; } set { this.isSyncing = value; this.RaisePropertyChanged(() => this.IsSyncing); } }
The RaiseProperty Changed method uses an expression for compiletime verification.
The code for the AppSettingsView page illustrates a solution to a common issue in Silverlight for the Windows Phone 7 platform. By default, the view does not notify the view model of property value changes until the control loses focus. For example, new content in the textBoxUserName control is lost if the user tries to save the settings before moving to another control. The UpdateTextBindingOn PropertyChanged behavior from the Prism Library ensures that the view always notifies the view model of any changes in the TextBox control as soon as they happen. The UpdatePasswordBindingOn PropertyChanged behavior does the same for the PasswordBox control. For more information, see the section, Handling Focus Events, later in this chapter. Data Binding and the Pivot Control The application uses the Pivot control to allow the user to view different filtered lists of surveys. Figure 5 shows the components in the mobile client application that relate to the Pivot control as it s used on the SurveyListView page.
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View
SurveyListView.xaml PivotControl control PivotItem control ListBox control Binding Binding PivotItem co ListBox co
View Model
SurveyListViewModel class
SelectedPivotIndex property ICollectionView properties for ListBox control bindings NewItems property FavoriteItems property ByLengthItems property LocalItems property
ViewModelLocator class DataContext
SurveyListViewModel property
figure 5 Using the Pivot control on the SurveyListView page
The following code example shows how the Pivot control on the SurveyListView page binds to the SelectedPivotIndex property of the SurveyListViewModel instance. This two-way binding determines which PivotItem control, and therefore which list of surveys, is displayed on the page. Remember, the ViewModelLocator class is responsible for locating the correct view model for a view.
XAML <phoneControls:Pivot Title="TAILSPIN SURVEYS" Name="homePivot" SelectedIndex="{Binding SelectedPivotIndex, Mode=TwoWay}" Visibility="{Binding SettingAreConfigured, Converter={StaticResource VisibilityConverter}}"> </phoneControls:PivotControl>
The following code example shows the definition of the Pivot Item control that holds a list of new surveys; it also shows how the ListBox control binds to the NewItems property in the view model.
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XAML <phoneControls:PivotItem Header="new"> <StackPanel Orientation="Vertical"> <ContentControl Template="{StaticResource NoItemsTextBlock}" Visibility="{Binding NewItems.IsEmpty, Converter={StaticResource VisibilityConverter}}" /> <ListBox ItemsSource="{Binding NewItems}" Style="{StaticResource SurveyTemplateItemStyle}" Visibility="{Binding NewItems.IsEmpty, Converter={StaticResource NegativeVisibilityConverter}}" > </ListBox> </StackPanel> </phoneControls:PivotItem>
Note: In the list, the layout and formatting of each survey s information is handled by the SurveyTemplateItemStyle style and the SurveyDateTemplate data template in the Styles.xaml file. The SurveyListViewModel class uses CollectionViewSource objects to hold the list of surveys to display in the list on each Pivot Item control. This allows the view model to notice and to react to changes in the item selected in the view, without needing to know about the view itself. The following code example shows how the SurveyListViewModel class defines the properties that the ListBox controls bind to.
C# private CollectionViewSource newSurveysViewSource; private CollectionViewSource byLengthViewSource; private CollectionViewSource favoritesViewSource; public ICollectionView NewItems { get { return this.newSurveysViewSource.View; } } public ICollectionView FavoriteItems { get { return this.favoritesViewSource.View; } } public ICollectionView ByLengthItems { get { return this.byLengthViewSource.View; } }
The following code example shows how the BuildPivot Dimensions method populates the CollectionViewSource objects. In this example, to save space, only the code that populates the newSurveysViewSource property is shown.
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