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.add_CollectionChanged(new NotifyCollectionChangedEventHandler(this, (IntPtr)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 = new NotifyCollectionChangedEventHandler(this, (IntPtr)this.OnNotifyCollectionChanged);
}
(source as INotifyCollectionChanged).add_CollectionChanged(handler);
}
}
private void PrepareTemporaryGroups()
{
this._temporaryGroup = new CollectionViewGroupRoot(this, this.CheckFlag(CollectionViewFlags.IsDataInGroupOrder));
foreach (GroupDescription description in this._group.GroupDescriptions)
{
this._temporaryGroup.GroupDescriptions.Add(description);
}
this._temporaryGroup.Initialize();
this._isGrouping = false;
if (this._temporaryGroup.GroupDescriptions.Count > 0)
{
int num = 0;
int count = this._internalList.Count;
while (num < count)
{
object objB = this._internalList[num];
if ((objB != null) && (!this.IsAddingNew || !object.Equals(this.CurrentAddItem, objB)))
{
this._temporaryGroup.AddToSubgroups(objB, true);
}
num++;
}
if (this.IsAddingNew)
{
this._temporaryGroup.InsertSpecialItem(this._temporaryGroup.Items.Count, this.CurrentAddItem, true);
}
}
this._isGrouping = this._temporaryGroup.GroupBy != null;
this.PrepareGroupingComparer(this._temporaryGroup);
}
private void PrepareGroupingComparer(CollectionViewGroupRoot groupRoot)
{
if ((groupRoot == this._temporaryGroup) || (this.PageSize == 0))
{
CollectionViewGroupInternal.ListComparer activeComparer = groupRoot.ActiveComparer as CollectionViewGroupInternal.ListComparer;
if (activeComparer != null)
{
activeComparer.ResetList(this.InternalList);
}
else
{
groupRoot.ActiveComparer = new CollectionViewGroupInternal.ListComparer(this.InternalList);
}
}
else if (groupRoot == this._group)
{
groupRoot.ActiveComparer = new CollectionViewGroupInternal.CollectionViewGroupComparer(this._temporaryGroup);
}
}
