public static void SetResContext(DependencyObject obj, ResParamList value)
{
obj.SetValue(ResContextProperty, value);
}
/// <summary>
/// Our goal dynamically react to current culture and parameters changings.
/// So we can't just return localized object. We create binding which
/// via ProvideValue() returns BindingExpression.
/// This BindingExpression provides dynamic refresh when current culture or parameters are changing.
/// In spite of it's name the method returns BindingExpression, not localized value
/// </summary>
protected override object GetValue(IServiceProvider serviceProvider)
{
if (string.IsNullOrEmpty(Key))
{
throw new ArgumentException("Key cannot be null");
}
IProvideValueTarget targetHelper = serviceProvider.GetService(typeof(IProvideValueTarget)) as IProvideValueTarget;
if (!(targetHelper.TargetProperty is DependencyProperty))
{
// It's setter. Return this for calling this method on real target object
return(this);
}
DependencyObject targetObject = targetHelper.TargetObject as DependencyObject;
if (targetObject != null && DesignerProperties.GetIsInDesignMode(targetObject))
{
EnsureAppResourcesLoaded();
}
ResParamList paramList = null;
if (targetObject != null && Parameters.Count == 0)
{
paramList = GetResContext(targetObject);
}
if (paramList == null)
{
paramList = Parameters;
}
var converter = new ResConverter {
KeyProvider = KeyProvider, ResExtension = this, Parameters = paramList
};
Binding binding = new Binding("UICulture")
{
Source = CultureManager.Instance,
Mode = BindingMode.OneWay
};
// For simple key just watch for culture changing
if (paramList.Count == 0)
{
binding.Converter = converter;
return(binding.ProvideValue(serviceProvider));
}
// For composite key or formatted string watch for culture, key parts or parameters changing
var multiBinding = new MultiBinding {
Mode = BindingMode.OneWay, Converter = converter
};
foreach (var param in paramList)
{
multiBinding.Bindings.Add(param);
}
// Converter waits the culter as last parameter
multiBinding.Bindings.Add(binding);
return(multiBinding.ProvideValue(serviceProvider));
}
