Code:
/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / MS / Internal / Data / CollectionViewGroupRoot.cs / 1305600 / CollectionViewGroupRoot.cs
//---------------------------------------------------------------------------- // //// Copyright (C) 2003 by Microsoft Corporation. All rights reserved. // // // // Description: Root of CollectionViewGroup structure, as created by a CollectionView according to a GroupDescription. // CollectionView classes use this class to manage all Grouping functionality. // // See spec at http://avalon/connecteddata/Specs/Grouping.mht // //--------------------------------------------------------------------------- using System; using System.Collections; // IComparer using System.Collections.ObjectModel; // ObservableCollection using System.Collections.Specialized; // INotifyCollectionChanged using System.ComponentModel; // PropertyChangedEventArgs, GroupDescription using System.Diagnostics; // Debug.Assert using System.Globalization; using System.Windows.Data; // CollectionViewGroup namespace MS.Internal.Data { // CollectionView classes use this class as the manager of all Grouping functionality internal class CollectionViewGroupRoot : CollectionViewGroupInternal, INotifyCollectionChanged { internal CollectionViewGroupRoot(CollectionView view) : base("Root", null) { _view = view; } #region INotifyCollectionChanged ////// Raise this event when the (grouped) view changes /// public event NotifyCollectionChangedEventHandler CollectionChanged; ////// Notify listeners that this View has changed /// ////// CollectionViews (and sub-classes) should take their filter/sort/grouping /// into account before calling this method to forward CollectionChanged events. /// /// /// The NotifyCollectionChangedEventArgs to be passed to the EventHandler /// public void OnCollectionChanged(NotifyCollectionChangedEventArgs args) { if (args == null) throw new ArgumentNullException("args"); if (CollectionChanged != null) CollectionChanged(this, args); } #endregion INotifyCollectionChanged ////// The description of grouping, indexed by level. /// public virtual ObservableCollectionGroupDescriptions { get { return _groupBy; } } /// /// A delegate to select the group description as a function of the /// parent group and its level. /// public virtual GroupDescriptionSelectorCallback GroupBySelector { get { return _groupBySelector; } set { _groupBySelector = value; } } // a group description has changed somewhere in the tree - notify host protected override void OnGroupByChanged() { if (GroupDescriptionChanged != null) GroupDescriptionChanged(this, EventArgs.Empty); } #region Internal Events and Properties internal event EventHandler GroupDescriptionChanged; internal IComparer ActiveComparer { get { return _comparer; } set { _comparer = value; } } ////// Culture to use during sorting. /// internal CultureInfo Culture { get { return _view.Culture; } } internal bool IsDataInGroupOrder { get { return _isDataInGroupOrder; } set { _isDataInGroupOrder = value; } } #endregion Internal Events and Properties #region Internal Methods internal void Initialize() { if (_topLevelGroupDescription == null) { _topLevelGroupDescription = new TopLevelGroupDescription(); } InitializeGroup(this, _topLevelGroupDescription, 0); } internal void AddToSubgroups(object item, bool loading) { AddToSubgroups(item, this, 0, loading); } internal bool RemoveFromSubgroups(object item) { return RemoveFromSubgroups(item, this, 0); } internal void RemoveItemFromSubgroupsByExhaustiveSearch(object item) { RemoveItemFromSubgroupsByExhaustiveSearch(this, item); } internal void InsertSpecialItem(int index, object item, bool loading) { ChangeCounts(item, +1); ProtectedItems.Insert(index, item); if (!loading) { int globalIndex = this.LeafIndexFromItem(item, index); OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Add, item, globalIndex)); } } internal void RemoveSpecialItem(int index, object item, bool loading) { Debug.Assert(Object.Equals(item, ProtectedItems[index]), "RemoveSpecialItem finds inconsistent data"); int globalIndex = -1; if (!loading) { globalIndex = this.LeafIndexFromItem(item, index); } ChangeCounts(item, -1); ProtectedItems.RemoveAt(index); if (!loading) { OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Remove, item, globalIndex)); } } protected override int FindIndex(object item, object seed, IComparer comparer, int low, int high) { // root group needs to adjust the bounds of the search to exclude the // placeholder and new item (if any) IEditableCollectionView iecv = _view as IEditableCollectionView; if (iecv != null) { if (iecv.NewItemPlaceholderPosition == NewItemPlaceholderPosition.AtBeginning) { ++low; if (iecv.IsAddingNew) { ++low; } } else { if (iecv.IsAddingNew) { --high; } if (iecv.NewItemPlaceholderPosition == NewItemPlaceholderPosition.AtEnd) { --high; } } } return base.FindIndex(item, seed, comparer, low, high); } #endregion Internal Methods #region private methods // Initialize the given group void InitializeGroup(CollectionViewGroupInternal group, GroupDescription parentDescription, int level) { // set the group description for dividing the group into subgroups GroupDescription groupDescription = GetGroupDescription(group, parentDescription, level); group.GroupBy = groupDescription; // create subgroups for each of the explicit names ObservableCollection
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