//protected bool Update<TType, TValue>(object sender, TType targetObject, NDBasePropertyKey<TKey, TType, TValue> property, TValue newValue, bool hasNewValue, TValue oldValue, bool hasOldValue, ValueProvider<TKey> currentProvider, TValue currentValue)
// where TType : class
//{
// return Update(sender, targetObject, property, newValue, hasNewValue, () => true, oldValue, hasOldValue, currentProvider, currentValue);
//}
internal bool Update <TType, TValue>(object sender, TType targetObject, NDBasePropertyKey <TKey, TType, TValue> property, TValue newProviderValue, bool hasNewValue, Func <TValue, bool> updateCode, TValue oldProviderValue, bool hasOldValue, ValueProvider <TKey> oldActualProvider, TValue oldActualValue)
where TType : class
{
var otherProviderIndex = PropertyRegistar <TKey> .ProviderOrder[oldActualProvider];
var thisIndex = PropertyRegistar <TKey> .ProviderOrder[this];
if (!property.Settigns.HasFlag(NDPropertySettings.CallOnChangedHandlerOnEquals) && Object.Equals(oldProviderValue, newProviderValue) && hasOldValue == hasNewValue)
{
return(true);
}
TValue newActualValue = default;
ValueProvider <TKey> newActualProvider = null;
if (this == oldActualProvider && !hasNewValue)
{
// the current value was provided by the changing provider but now it will no longer have a value
// we need to find out what the new value will be.
bool found = false;
foreach (var item in PropertyRegistar <TKey> .ValueProviders)
{
if (item == this)
{
continue;
}
var(providerValue, hasValue) = item.GetValue(targetObject, property);
if (hasValue)
{
found = true;
newActualProvider = item;
newActualValue = providerValue;
break;
}
}
if (!found)
{
throw new InvalidOperationException("No Value Found");
}
}
else if (otherProviderIndex >= thisIndex)
{
newActualProvider = this;
newActualValue = newProviderValue;
}
else
{
newActualProvider = oldActualProvider;
newActualValue = oldActualValue;
}
// We need to call the actial update after we recived the current old value. Otherwise we could already read the
OnChangingArg <TKey, TValue> onChangingArg;
if (property as object is NDAttachedPropertyKey <TKey, TType, TValue> attach)
{
var attachArg = OnChangingArg.Create(targetObject, oldProviderValue, hasOldValue, newProviderValue, hasNewValue, this, oldActualProvider, newActualProvider, oldActualValue, newActualValue, hasNewValue || !this.canDeletionBePrevented);
onChangingArg = attachArg;
attach.changedMethod(attachArg);
}
else if (property as object is NDPropertyKey <TKey, TType, TValue> p)
{
onChangingArg = OnChangingArg.Create(oldProviderValue, hasOldValue, newProviderValue, hasNewValue, this, oldActualProvider, newActualProvider, oldActualValue, newActualValue, hasNewValue || !this.canDeletionBePrevented);
p.changedMethod(targetObject)(onChangingArg);
}
else
{
throw new NotSupportedException();
}
var result = PropertyRegistar <TKey> .ChangeValue(sender, property, targetObject, onChangingArg, updateCode);
FireEventHandler(property, targetObject, sender, ChangedEventArgs.Create(targetObject, property, oldProviderValue, newProviderValue));
return(result);
}