internal Group(
GroupGeneratorNode node,
CollectionViewGroup group,
LateGroupLevelDescription groupLevelDescription,
DataGridContext dataGridContext)
{
if (node == null)
{
throw new ArgumentNullException("node");
}
if (group == null)
{
throw new ArgumentNullException("group");
}
if (groupLevelDescription == null)
{
throw new ArgumentNullException("groupLevelDescription");
}
if (dataGridContext == null)
{
throw new ArgumentNullException("dataGridContext");
}
m_collectionViewGroup = group;
// Initialization is done through setters to register for events.
this.DataGridContext = dataGridContext;
this.GeneratorNode = node;
this.GroupLevelDescription = groupLevelDescription;
}
private void UnregisterGroupLevelDescriptionEvent(LateGroupLevelDescription item)
{
if (item == null)
{
return;
}
item.PropertyChanged -= new PropertyChangedEventHandler(this.OnGroupLevelDescriptionChanged);
}
private void RegisterGroupLevelDescriptionEvent(LateGroupLevelDescription item, bool force)
{
if (item == null)
{
return;
}
lock (this.SyncRoot)
{
if (!force && (m_propertyChanged == null))
{
return;
}
item.PropertyChanged += new PropertyChangedEventHandler(this.OnGroupLevelDescriptionChanged);
}
}