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The Authorizer Control
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The ReadWriteAuthorization control from the Csla.Windows namespace helps Windows Forms developers build interfaces where the controls on the form alter their appearance based on whether the user is authorized to read or write to the underlying business object property. The Authorizer control in the Csla.Wpf namespace provides similar functionality for WPF. The Authorizer control is a decorator control and is a subclass of DataDecoratorBase. If you want it to
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CHAPTER 10 DATA B INDING
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affect the appearance of multiple controls, you can nest those controls within a panel or other container control and then put that container control inside the Authorizer control. In most cases, developers will probably prefer the PropertyStatus control instead of Authorizer, because it handles not only authorization but also validation and busy status notification. However, Authorizer does provide an alternative, making it easy to implement authorization for a group of data bound controls contained within the Authorizer control. Authorizer uses the IAuthorizeReadWrite interface from the Csla.Security namespace to interact with the business object. I ll discuss this interface in more detail in 13. The control uses this interface to determine whether the user is authorized to read or write to each business object property that is data bound to a control contained within the Authorizer control. Any time the underlying data object (DataContext) is changed or a Refresh() method is called, Authorizer scans all the controls it contains, checking each binding to see whether the current user is authorized to read and write the associated property. DataDecoratorBase does much of the hard work.
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If a property is not readable, Authorizer changes the UI control s Visibility to be Hidden or Collapsed. An attached property defined by Authorizer called NotVisibleModeProperty is used to choose which option should be used for each UI control. Private Shared ReadOnly NotVisibleModeProperty As DependencyProperty = _ DependencyProperty.RegisterAttached("NotVisibleMode", _ GetType(VisibilityMode), _ GetType(Authorizer), _ New FrameworkPropertyMetadata(VisibilityMode.Collapsed), _ AddressOf IsValidVisibilityMode) The SetRead() method determines whether the user is authorized to read a property, and it alters the bound control s Visibility accordingly. Private Sub SetRead(ByVal bnd As Binding, _ ByVal ctl As UIElement, ByVal source As IAuthorizeReadWrite) Dim canRead = source.CanReadProperty(bnd.Path.Path) Dim visibilityMode = GetNotVisibleMode(ctl) If canRead Then Select Case visibilityMode Case visibilityMode.Collapsed If ctl.Visibility = Visibility.Collapsed Then ctl.Visibility = Visibility.Visible End If Case visibilityMode.Hidden If ctl.Visibility = Visibility.Hidden Then ctl.Visibility = Visibility.Visible End If Case Else ' ignore End Select Else Select Case visibilityMode Case visibilityMode.Collapsed ctl.Visibility = Visibility.Collapsed Case visibilityMode.Hidden ctl.Visibility = Visibility.Hidden
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C HAPTE R 10 DA TA BINDIN G
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Case Else ' ignore End Select End If End Sub The Visibility property is set back to Visible if the user is authorized to read the value.
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If a property is not updatable, Authorizer will check to see whether the UI control has an IsReadOnly property; if it does, it will set the value to True. Otherwise, it will set the IsEnabled property to False, because all controls have that property. The SetWrite() method handles this. Private Sub SetWrite(ByVal bnd As Binding, _ ByVal ctl As UIElement, ByVal source As IAuthorizeReadWrite) Dim canWrite = source.CanWriteProperty(bnd.Path.Path) ' enable/disable writing of the value Dim propertyInfo = _ ctl.GetType().GetProperty("IsReadOnly", _ BindingFlags.FlattenHierarchy Or _ BindingFlags.Instance Or _ BindingFlags.Public) If propertyInfo IsNot Nothing Then propertyInfo.SetValue(ctl, (Not canWrite), New Object() {}) Else ctl.IsEnabled = canWrite End If End Sub There is no standard interface you can use to find the IsReadOnly property, so reflection is used. If the property exists, it will be set; otherwise, the code will fall back to disabling the UI control entirely. The Authorizer control can save a lot of UI code when building a form for editing details, because it manages the status of all data bound detail controls with little or no code required in the UI itself. You can see how this is used in 19.
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