/// <summary>
/// Localizes the specified objectProperty.
/// </summary>
/// <param name="objectProperty">The objectProperty to localize.</param>
/// <param name="options">The options describing how the objectProperty is to be localized.</param>
/// <exception cref="ArgumentException">A binding is specified and the objectProperty is a non-dependency objectProperty.</exception>
public static void Localize(this DependencyObjectProperty objectProperty, LocalizationOptions options)
{
var localizedValue = LocalizedValue.Create(objectProperty, options);
LocalizationManager.Add(localizedValue);
// Set the value initially
if (localizedValue.BindingExpression != null)
{
// The value uses bindings
localizedValue.TargetProperty.SetValue(localizedValue.TargetObject, localizedValue.BindingExpression);
}
else
{
// The value does not use bindings
localizedValue.TargetProperty.SetValue(localizedValue.TargetObject, localizedValue.ProduceValue());
}
}
public override object ProvideValue(IServiceProvider serviceProvider)
{
if (serviceProvider == null)
{
throw new ArgumentNullException(nameof(serviceProvider));
}
// Other useful services:
// - IDestinationTypeProvider
// - IRootObjectProvider
if (!(serviceProvider.GetService(typeof(IProvideValueTarget)) is IProvideValueTarget service))
{
return(null);
}
if (service.TargetObject is DependencyObject depObj)
{
if (Binding != null || _bindings?.Count > 0)
{
if (false == (service.TargetProperty is DependencyProperty))
{
// The what bindings are implemented in WPF provides no way to obtain the value
// produced by the binging. The only way is to update the property directly. Therefore,
// the extension cannot support bindings on non-dependency properties (same as WPF).
throw new NotSupportedException("Bindings are supported only on dependency properties.");
}
}
LocalizableProperty localizableProperty;
if (service.TargetProperty is DependencyProperty depProperty)
{
localizableProperty = new LocalizableDepProperty(depProperty);
}
else if (service.TargetProperty is PropertyInfo propertyInfo)
{
localizableProperty = new LocalizableNonDepProperty(propertyInfo);
}
else
{
throw new NotSupportedException($"The extension supports only dependency and non-dependency properties of dependency objects. Properties of type {service.TargetProperty.GetType()} are not supported.");
}
var options = new LocalizationOptions()
{
Key = Key,
StringFormat = StringFormat,
Binding = Binding,
Bindings = _bindings,
Callback = Callback,
CallbackParameter = CallbackParameter,
Converter = Converter,
ConverterParameter = ConverterParameter,
};
var localizedValue = LocalizedValue.Create(new DependencyObjectProperty(depObj, localizableProperty), options);
LocalizationManager.Add(localizedValue);
if (localizedValue.BindingExpression != null)
{
// The value uses bindings
return(localizedValue.BindingExpression);
}
else
{
// The value does not use bindings
if (localizedValue.IsInDesignMode)
{
// At design time VS designer does not set the parent of any control
// before its properties are set. For this reason the correct values
// of inherited attached properties cannot be obtained.
// Therefore, to display the correct localized value it must be updated
// later after the parent of the control has been set.
depObj.Dispatcher.BeginInvoke(
DispatcherPriority.ApplicationIdle,
new SendOrPostCallback(x => ((LocalizedValue)x).UpdateValue()),
localizedValue
);
return(localizableProperty.DefaultValue);
}
else
{
return(localizedValue.ProduceValue());
}
}
}
else if (service.TargetObject is Setter)
{
var rootObjectProvider = (IRootObjectProvider)serviceProvider.GetService(typeof(IRootObjectProvider));
// IRootObjectProvider is never null
// IRootObjectProvider.RootObject is null when the style is located in a separate resource dictionary file
// or the application's resource dictionary in App.xaml
// Otherwise, the value can be Window or UserControl depending on the where the style is declared.
// Therefore, it can be assumed that once root object (if any) is disposed the localized value
// can be disposed as well.
var rootObject = rootObjectProvider?.RootObject as DependencyObject;
if (rootObject == null)
{
// There is no way to access the resource manager (apart from the resource manager of the entry assembly).
// In order to avoid misunderstanding and bugs localizing setters is not supported unless they are delcared inside a Window or a UserControl
throw new NotSupportedException("Setters are supported only inside a Window or a UserControl. They are not supported inside a ResourceDictionary file or App.xaml.");
}
var options = new LocalizationOptions()
{
Key = Key,
StringFormat = StringFormat,
Binding = Binding,
Bindings = _bindings,
Callback = Callback,
CallbackParameter = CallbackParameter,
Converter = Converter,
ConverterParameter = ConverterParameter,
};
var localizedValueTuple = LocalizedSetterValue.Create(rootObject, options);
LocalizationManager.Add(localizedValueTuple.Item1);
return(localizedValueTuple.Item2.ProvideValue(serviceProvider));
}
else if (service.TargetProperty is DependencyProperty || service.TargetProperty is PropertyInfo)
{
// The extension is used in a template and will be evaluated once the template is instantiated
return(this);
}
else
{
throw new NotSupportedException($"The localization extension can be used only with {nameof(DependencyObject)}s.");
}
}