/// <summary>
/// Sets a binding between a <c>DependencyObject</c> with its<c>DependencyProperty</c> and this
/// <c>BaseLocalizeExtension</c>.
/// </summary>
/// <param name="targetObject">The target dependency object.</param>
/// <param name="targetProperty">The target dependency property.</param>
/// <returns><c>True</c> if the binding was setup successfully, otherwise <c>False</c> (Binding already exists).</returns>
public bool SetBinding(DependencyObject targetObject, DependencyProperty targetProperty)
{
// indicates, if the target object was found
bool foundInWeakReferences = this.targetObjects.Any(wr => wr.Target == targetObject);
// search for the target in the target object list
// set the TargetProperty to the passed one
this.TargetProperty = targetProperty;
// if the target it's not collected already, collect it
if (!foundInWeakReferences)
{
// if it's the first object, add an event handler too
if (this.targetObjects.Count == 0)
{
// add this localize extension to the WeakEventManager on LocalizeDictionary
OddsFormatManager.AddEventListener(this);
}
// add the target as an dependency object as weak reference to the dependency object list
this.targetObjects.Add(new WeakReference(targetObject));
// adds this localize extension to the ObjectDependencyManager to ensure the lifetime along with the
// target object
ObjectDependencyManager.AddObjectDependency(new WeakReference(targetObject), this);
string oddsString = GetLocalizedOddsString(
this.displayValue, this.GetForcedOddsFormatOrDefault(), CultureInfo.CurrentCulture);
// set the initial value of the dependency property
targetObject.SetValue(this.TargetProperty, oddsString);
// return true, the binding was successfully
return(true);
}
// return false, the binding already exists
return(false);
}
/// <summary>Provides the Value for the first Binding.</summary>
/// <param name="serviceProvider">The <c>IProvideValueTarget</c> provided from the <c>MarkupExtension</c>.</param>
/// <returns>The found item from the .resx directory or <c>null</c> if not found.</returns>
/// <remarks>
/// This method register the <c>EventHandler</c><c>OnCultureChanged</c> on <c>LocalizeDictionary</c> to get an
/// acknowledge of changing the culture, if the passed <c>TargetObjects</c> type of <see
/// cref="DependencyObject" />. !PROOF: On every single <c>UserControl</c>, Window, and Page, there is a
/// new SparedDP reference, and so there is every time a new <c>BaseLocalizeExtension</c>! Because of this, we
/// don't need to notify every single DependencyObjects to update their value (for GC).
/// </remarks>
public override object ProvideValue(IServiceProvider serviceProvider)
{
if (serviceProvider == null)
{
throw new ArgumentNullException("serviceProvider");
}
// try to cast the passed serviceProvider to a IProvideValueTarget
var service = serviceProvider.GetService(typeof(IProvideValueTarget)) as IProvideValueTarget;
// if the cast fails, an exception will be thrown. (should never happen)
if (service == null)
{
throw new InvalidOperationException("IProvideValueTarget service is unavailable");
}
// if the service.TargetObject is a Binding, throw an exception
if (service.TargetObject is Binding)
{
throw new InvalidOperationException("Use as binding is not supported!");
}
// try to cast the service.TargetProperty as DependencyProperty
this.TargetProperty = service.TargetProperty as DependencyProperty;
// if this fails, return this (should never happen)
if (this.TargetProperty == null)
{
return(this);
}
// indicates, if the target object was found
bool foundInWeakReferences = this.targetObjects.Any(wr => wr.Target == service.TargetObject);
// search for the target in the target object list
// if the target is a dependency object and it's not collected already, collect it
if (service.TargetObject is DependencyObject && !foundInWeakReferences)
{
// if it's the first object, add an event handler too
if (this.targetObjects.Count == 0)
{
// add this localize extension to the WeakEventManager on LocalizeDictionary
OddsFormatManager.AddEventListener(this);
}
// add the target as an dependency object as weak reference to the dependency object list
this.targetObjects.Add(new WeakReference(service.TargetObject));
// adds this localize extension to the ObjectDependencyManager to ensure the lifetime along with the
// target object
ObjectDependencyManager.AddObjectDependency(new WeakReference(service.TargetObject), this);
}
// if the service.TargetObject is System.Windows.SharedDp (= not a DependencyObject), we return "this". the
// SharedDp will call this instance later again.
if (!(service.TargetObject is DependencyObject))
{
// by returning "this", the provide value will be called later again.
return(this);
}
// return the new value for the DependencyProperty
return(GetLocalizedOddsString(
this.displayValue, this.GetForcedOddsFormatOrDefault(), CultureInfo.CurrentCulture));
}