/// <summary>
/// Provides a values to be used by the framework to set a given target's object target property binding.
/// </summary>
/// <param name="serviceProvider">Service provider offered by the framework.</param>
/// <returns>A <see cref="Binding"/> for the targeted object and property.</returns>
public override object ProvideValue(IServiceProvider serviceProvider)
{
var result = base.ProvideValue(serviceProvider);
// 'Normal' binding is no filter source type is provided:
if (SourceType == null)
{
initialized = true;
}
// else process only if a binding was issued and source type is not set:
else if (result is BindingExpression)
{
// Build self binding which will be our "null" value to set:
selfPropertyBinding = BindingHelpers.GetIdentityBinding(TargetProperty);
// Try init:
Initialize(GetInnerBindingSource(serviceProvider));
if (!initialized || init_to_empty)
{
innerBinding = InnerBinding; // keep a copy for later usage.
return(selfPropertyBinding.ProvideValue(serviceProvider)); // return empty binding we do not know source type or if inited as it.
}
}
return(result); // return if full binding is required, or SharedDp or whatever was issued.
}
/// <summary>
/// Provides a values to be used by the framework to set a given target's object target property binding.
/// </summary>
/// <param name="serviceProvider">Service provider offered by the framework.</param>
/// <returns>A <see cref="Binding"/> for the targeted object and property.</returns>
public override object ProvideValue(IServiceProvider serviceProvider)
{
// Format will be:
// <MyDependencyObject MyProperty={BoundPathBinding PathValueBinding={Binding somePropertyProvider}} />
// Build binding in base:
var result = base.ProvideValue(serviceProvider);
// 'Normal' binding is no path is provided:
if (PathValueBinding == null)
{
initialized = true;
}
// Else try to setup binding from here (else will be redone at init and loading):
else if (result is BindingExpression)
{
// As we won't return it as result to framework, it will be GCed. Keep a copy now:
boundPathBinding = InnerBinding?.Clone();
if (boundPathBinding != null)
{
// Try to init now:
providing_value = true;
Initialize(serviceProvider);
providing_value = false;
// If success, then return bound path binding immediately:
if (initialized)
{
return(boundPathBinding.ProvideValue(serviceProvider));
}
else // Else return empty binding:
{
// Build self binding which will be our "null" value to set:
selfPropertyBinding = BindingHelpers.GetIdentityBinding(TargetProperty);
return(selfPropertyBinding.ProvideValue(serviceProvider)); // and return an empty binding while path is unresolved.
}
}
else
{
initialized = true;
}
}
return(result);
}
