// *** Protected Methods ***
protected void PostUpdate(DataListUpdate update)
{
foreach (IUpdatableCollection collection in updateSubscriptions)
{
collection.Update(update);
}
}
private void Update_Add(DataListUpdate update)
{
// If the entire update is outside of the visible collection then ignore it
if (update.Index > currentCount)
{
return;
}
currentCount += update.Count;
base.OnItemsAdded(update.Index, update.Count);
}
private void Update_Remove(DataListUpdate update)
{
// If the entire update is outside of the visible collection then ignore it
if (update.Index >= currentCount)
{
return;
}
// If the update overlaps the boundary of the visible collection then only remove visible items
int removedItemCount = Math.Min(update.Count, currentCount - update.Index);
currentCount -= removedItemCount;
base.OnItemsRemoved(update.Index, removedItemCount);
}
// *** IUpdatableCollection Members ***
void IUpdatableCollection.Update(DataListUpdate update)
{
switch (update.Action)
{
case DataListUpdateAction.Add:
base.OnItemsAdded(update.Index, update.Count);
break;
case DataListUpdateAction.Remove:
base.OnItemsRemoved(update.Index, update.Count);
break;
case DataListUpdateAction.Reset:
base.Reset();
break;
}
}
// *** IUpdatableCollection Members ***
void IUpdatableCollection.Update(DataListUpdate update)
{
switch (update.Action)
{
case DataListUpdateAction.Add:
Update_Add(update);
break;
case DataListUpdateAction.Remove:
Update_Remove(update);
break;
case DataListUpdateAction.Reset:
Update_Reset();
break;
}
}