object IBindingValueProvider.GetValue(DependencyProperty prop, BindingExression be, IDataContextProvider source)
{
var value = GetValue(prop, be, source);
value = ApplyConverter(prop, be, value, source);
return(value);
}
private static object GetMemberValue(DependencyProperty prop, BindingExression be, object context, Type type, string targetName)
{
var hashcode = ComputeHash(prop, be, type, targetName);
var fpa = Accessors.GetOrAdd(hashcode, p => new FastPropertyAccessor(type, targetName, be.BindingMode == BindingMode.Readonly));
return(fpa.GetValue(context));
}
protected override object GetValueInternal(DependencyProperty prop, BindingExression be, object context)
{
if (!(context is Article))
{
throw new ArgumentException("context must be Article");
}
return(DPathProcessor.Process(be.Expression, (Article)context).Select(mop => mop.ModelObject).ToArray());
}
protected virtual object GetValue(DependencyProperty prop, BindingExression be, IDataContextProvider source)
{
var dc = source?.GetDataContext(be);
if (dc == null)
{
return(DependencyProperty.UnsetValue);
}
return(be.Expression == "$DataContext" ? dc : GetValueInternal(prop, be, dc));
}
private BindingExression CreateExpression()
{
var be = new BindingExression(Path, Mode)
{
IsAbsolute = IsAbsolute,
Offset = Offset,
Converter = Converter,
Parameter = Parameter,
Log = Log,
BindingValueProvider = BindingValueProvider
};
return(be);
}
protected static object ApplyConverter(DependencyProperty dp, BindingExression be, object value, IDataContextProvider source)
{
if (be.Converter != null && value != DependencyProperty.UnsetValue)
{
var setter = be.Converter as IDataContextProviderSetter;
setter?.ApplyProvider(source);
value = be.Converter.Convert(value, dp.PropertyType, be.Parameter, CultureInfo.CurrentCulture);
if (value == null)
{
return(dp.GetDefaultValue());
}
}
return(value);
}
object IDataContextProvider.GetDataContext(BindingExression expr)
{
if (_overridenProvider != null)
{
return(_overridenProvider.GetDataContext(expr));
}
var list = GetDataContextList().Skip(expr.Offset);
if (expr.IsAbsolute)
{
return(list.LastOrDefault());
}
else
{
return(list.FirstOrDefault());
}
}
internal void RegisterBinding(DependencyProperty dp, BindingExression bindingExpression)
{
// получим dependencyproperty
if (dp == null)
{
throw new ArgumentNullException("dp");
}
if (dp.Log)
{
var logger = ObjectFactoryBase.Resolve <ILogger>();
logger.Debug(string.Format("for {0} {1}.{2} {3} list: {4}", dp, dp.OwnerType, dp.PropertyType, bindingExpression.Expression, _bindings.GetHashCode()));
}
_bindings[dp] = bindingExpression;
// удаляем текущее значение, если оно было
_valueTable[dp] = new ValueEntry(DependencyProperty.UnsetValue);
}
private static string ComputeHash(DependencyProperty prop, BindingExression be, Type type, string path)
{
return("_hash" + prop.uId + "_" + be.GetHashCode() + "!" + type.GetHashCode() + prop.OwnerType + "-" + be.BindingMode + "_" + path);
}
protected object GetHierarchicalMemberInvocationValue(DependencyProperty prop, BindingExression be, object context, string targetName)
{
if (string.IsNullOrEmpty(targetName))
{
return(context);
}
var array = targetName.Split(new[] { '.' }, StringSplitOptions.RemoveEmptyEntries);
var value = context;
foreach (var memberAccess in array)
{
if (value != null)
{
value = GetMemberValue(prop, be, value, value.GetType(), memberAccess);
}
}
return(value);
}
protected virtual object GetValueInternal(DependencyProperty prop, BindingExression be, object context)
{
return(GetHierarchicalMemberInvocationValue(prop, be, context, be.Expression));
}
