private bool _isCurrentlyUpdatingUserModification = false; // To prevent re-entrance. Only one check at a time is supported.
private void EnumWrapperItemOnPropertyChanged(object sender, PropertyChangedEventArgs e)
{
if (!_isCurrentlyUpdatingUserModification)
{
_isCurrentlyUpdatingUserModification = true;
EnumWrapperItem item = sender as EnumWrapperItem;
if (item != null)
{
if (e.PropertyName == nameof(EnumWrapperItem.IsChecked))
{
if (_isEnumFlag)
{
if (item.IsChecked)
{
_enumValue = EnumUtil.GenericAddBits(_enumValue, item.EnumValue);
}
else
{
_enumValue = EnumUtil.GenericRemoveBits(_enumValue, item.EnumValue);
}
}
else
{
if (item.IsChecked)
{
_enumValue = item.EnumValue;
}
foreach (var itemIter in _items)
{
if (!itemIter.EnumValue.Equals(item.EnumValue))
{
itemIter.IsChecked = false;
}
}
}
}
try
{
_owner.GetType().InvokeMember(_enumPropName,
BindingFlags.Instance | BindingFlags.Public | BindingFlags.FlattenHierarchy | BindingFlags.SetProperty,
null, _owner, new[] { _enumValue });
}
catch (Exception ex)
{
Debug.Print(ex.ToString());
}
}
}
_isCurrentlyUpdatingUserModification = false;
}
// ******************************************************************
// The enum property does not need to notifyPropertyChange. The wrapper will advise.
public EnumWrapperSource(INotifyPropertyChanged owner, [CallerMemberName] string enumPropName = null)
{
_owner = owner;
_enumPropName = enumPropName;
_enumValue = null;
if (_owner != null && !string.IsNullOrEmpty(_enumPropName))
{
var pi = _owner.GetType().GetProperty(_enumPropName);
if (pi != null)
{
_enumValue = pi.GetValue(_owner) as Enum;
}
}
if (_enumValue == null)
{
throw new ArgumentException("Unable to find the enum");
}
var flagAttribute = _enumValue.GetType().GetCustomAttribute <FlagsAttribute>();
if (flagAttribute != null)
{
_isEnumFlag = true;
}
_items = new ObservableCollection <EnumWrapperItem>();
foreach (Enum val in System.Enum.GetValues(_enumValue.GetType()))
{
string name = val.ToString();
string description = null;
var decriptionAttribute = val.GetType().GetField(val.ToString()).GetCustomAttribute <DescriptionAttribute>();
if (decriptionAttribute != null)
{
description = decriptionAttribute.Description;
}
else
{
description = name;
}
bool isInitialFlagOn = EnumUtil.GenericHasFlag(_enumValue, val);
var enumItemWrapper = new EnumWrapperItem(this, val, name, description, isInitialFlagOn);
_items.Add(enumItemWrapper);
enumItemWrapper.PropertyChanged += EnumWrapperItemOnPropertyChanged;
}
}
