private void SetFlag(CollectionViewFlags flags, bool value)
{
if (value)
{
_flags = _flags | flags;
}
else
{
_flags = _flags & ~flags;
}
}
public PagedCollectionView(IEnumerable source, bool isDataSorted, bool isDataInGroupOrder)
{
NotifyCollectionChangedEventHandler handler = null;
this._cachedPageIndex = -1;
this._currentChangedMonitor = new SimpleMonitor();
this._flags = CollectionViewFlags.ShouldProcessCollectionChanged;
this._pageIndex = -1;
if (source == null)
{
throw new ArgumentNullException("source");
}
this._sourceCollection = source;
this.SetFlag(CollectionViewFlags.IsDataSorted, isDataSorted);
this.SetFlag(CollectionViewFlags.IsDataInGroupOrder, isDataInGroupOrder);
this._temporaryGroup = new CollectionViewGroupRoot(this, isDataInGroupOrder);
this._group = new CollectionViewGroupRoot(this, false);
this._group.GroupDescriptionChanged += new EventHandler(this.OnGroupDescriptionChanged);
this._group.GroupDescriptions.CollectionChanged += new NotifyCollectionChangedEventHandler(this.OnGroupByChanged);
this.CopySourceToInternalList();
this._trackingEnumerator = source.GetEnumerator();
if (this._internalList.Count > 0)
{
this.SetCurrent(this._internalList[0], 0, 1);
}
else
{
this.SetCurrent(null, -1, 0);
}
this.SetFlag(CollectionViewFlags.CachedIsEmpty, this.Count == 0);
this._pollForChanges = !(source is INotifyCollectionChanged);
if (!this._pollForChanges)
{
if (handler == null)
{
handler = delegate (object sender, NotifyCollectionChangedEventArgs args) {
this.ProcessCollectionChanged(args);
};
}
(source as INotifyCollectionChanged).CollectionChanged += handler;
}
}
/// <summary>
/// Sets the specified Flag(s)
/// </summary>
/// <param name="flags">Flags we want to set</param>
/// <param name="value">Value we want to set these flags to</param>
private void SetFlag(CollectionViewFlags flags, bool value)
{
if (value)
{
this._flags = this._flags | flags;
}
else
{
this._flags = this._flags & ~flags;
}
}
/// <summary>
/// Returns true if specified flag in flags is set.
/// </summary>
/// <param name="flags">Flag we are checking for</param>
/// <returns>Whether the specified flag is set</returns>
private bool CheckFlag(CollectionViewFlags flags)
{
return (this._flags & flags) != 0;
}
//------------------------------------------------------
//
// Private Methods
//
//------------------------------------------------------
// returns true if ANY flag in flags is set.
private bool CheckFlag(CollectionViewFlags flags)
{
return((_flags & flags) != 0);
}