/// <summary>
/// Called when the underlying query changes.
/// </summary>
/// <param name="sender">The sender.</param>
/// <param name="args">The arguments.</param>
private void OnChanged(object sender, QueryChangeEventArgs args)
{
// $todo(jeff.lill):
//
// For now, I'm simply going to update the entire collection. In the future,
// it may be possible to compare the current collection with the new query
// results to try to minimize the changes. This could result in a better
// user experience.
rowList.Clear();
foreach (var row in liveQuery.Rows)
{
var entityRow = new EntityQueryRow <TEntity>(row);
if (postFilter != null && !postFilter(entityRow))
{
continue;
}
rowList.Add(entityRow);
}
CollectionChanged?.Invoke(this, new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Reset));
}
/// <inheritdoc/>
IEnumerator IEnumerable.GetEnumerator()
{
foreach (var row in Base)
{
var entityRow = new EntityQueryRow <TEntity>(row);
if (postFilter != null && !postFilter(entityRow))
{
continue;
}
yield return(entityRow);
}
}
/// <inheritdoc/>
public bool Remove(EntityQueryRow <TEntity> item)
{
throw new InvalidOperationException(ReadOnlyError);
}
/// <inheritdoc/>
public bool Contains(EntityQueryRow <TEntity> item)
{
return(rowList.Contains(item));
}
/// <inheritdoc/>
public void Add(EntityQueryRow <TEntity> item)
{
throw new InvalidOperationException(ReadOnlyError);
}
/// <inheritdoc/>
public void Insert(int index, EntityQueryRow <TEntity> item)
{
throw new InvalidOperationException(ReadOnlyError);
}
/// <inheritdoc/>
public int IndexOf(EntityQueryRow <TEntity> item)
{
return(rowList.IndexOf(item));
}
