///<inheritdoc/>
public virtual OptionItemValidities CheckValidity(ISelectionProvider <T> selection)
{
if (selection.Selection.Count == 0)
{
return(OptionItemValidities.Invalid);
}
OptionItemValidities retval = OptionItemValidities.ReadWrite;
foreach (IPropertyItemDescriptor <T> descriptor in selection.Selection)
{
IPropertyMap map = descriptor.Properties;
if (map == null)
{
return(OptionItemValidities.Invalid);
}
IPropertyItem item = map.GetEntry(virtualPropertyName);
if (item != null)
{
IValueGetter getter = item.Getter;
IValueSetter setter = item.Setter;
if (getter != null && getter.CanGet())
{
if (setter == null || !setter.CanSet())
{
//readonly item...
retval = OptionItemValidities.ReadOnly;
}
}
else
{
//we can't even get the values :-(
return(OptionItemValidities.Invalid);
}
}
else
{
return(OptionItemValidities.Invalid);
}
}
return(retval);
}
public void UpdateOptionItem(IOptionItem oi)
{
if (inUpdate)
{
return;
}
// if (!optionItem.IsAlive) {
// return;
// }
//
// IOptionItem oi = (IOptionItem)optionItem.Target;
//lock...
inUpdate = true;
ICollection <IPropertyItemDescriptor <T> > descriptors;
descriptors = selection.Selection;
if (descriptors.Count == 0)
{
SetUndefinedValue(oi);
inUpdate = false;
return;
}
bool filled = false;
object accumulatedValue = null;
foreach (IPropertyItemDescriptor <T> descriptor in descriptors)
{
//get the propertyItem from the current lookup
IPropertyMap map = descriptor.Properties;
if (map == null)
{
continue;
}
IPropertyItem item = map.GetEntry(virtualPropertyName);
if (item == null)
{
continue;
}
//get value from current selection item
IValueGetter getter = item.Getter;
if (getter == null || !getter.CanGet())
{
continue;
}
object value = getter.GetValue();
if (!filled)
{
//first value
accumulatedValue = value;
filled = true;
}
else
{
//check if value is different?
IEqualityComparer comparer = item.EqualityComparer;
if (comparer != null)
{
if (!comparer.Equals(accumulatedValue, value))
{
SetUndefinedValue(oi);
inUpdate = false;
return;
}
}
else
{
if (accumulatedValue != null && !accumulatedValue.Equals(value))
{
SetUndefinedValue(oi);
inUpdate = false;
return;
}
else if (accumulatedValue == null && value != null)
{
SetUndefinedValue(oi);
inUpdate = false;
return;
}
}
}
}
if (accumulatedValue == null)
{
if ((bool)oi.Attributes[OptionItem.SupportNullValueAttribute])
{
oi.Value = accumulatedValue;
}
}
else
{
oi.Value = accumulatedValue;
}
inUpdate = false;
}