Code:
/ Dotnetfx_Vista_SP2 / Dotnetfx_Vista_SP2 / 8.0.50727.4016 / DEVDIV / depot / DevDiv / releases / Orcas / QFE / wpf / src / Framework / MS / Internal / Data / CollectionViewGroupRoot.cs / 1 / 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
Link Menu
![Network programming in C#, Network Programming in VB.NET, Network Programming in .NET](/images/book.jpg)
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- RestClientProxyHandler.cs
- CommonBehaviorsSection.cs
- PartDesigner.cs
- TemplateInstanceAttribute.cs
- EntityProxyFactory.cs
- LocationSectionRecord.cs
- XPathMessageFilterElement.cs
- OleDbCommandBuilder.cs
- AutomationPatternInfo.cs
- WebPartConnectionsDisconnectVerb.cs
- SiteMembershipCondition.cs
- QilLiteral.cs
- figurelength.cs
- BitmapImage.cs
- DbDataAdapter.cs
- ToolStripLabel.cs
- HttpHostedTransportConfiguration.cs
- MemberMaps.cs
- ProfilePropertyNameValidator.cs
- SEHException.cs
- DataGridViewHitTestInfo.cs
- EntityViewGenerationConstants.cs
- ForeignKeyConstraint.cs
- DataGridViewAddColumnDialog.cs
- ToolStripGrip.cs
- VariantWrapper.cs
- StylusPointProperties.cs
- ProvidePropertyAttribute.cs
- DataControlFieldCollection.cs
- ClientUtils.cs
- SystemUnicastIPAddressInformation.cs
- EnumerableRowCollectionExtensions.cs
- EncodingInfo.cs
- FixedSOMElement.cs
- UniqueConstraint.cs
- SafeNativeMethods.cs
- DataBindingExpressionBuilder.cs
- SerializationInfoEnumerator.cs
- BStrWrapper.cs
- SingleTagSectionHandler.cs
- RectangleGeometry.cs
- DocumentApplicationState.cs
- Console.cs
- Propagator.ExtentPlaceholderCreator.cs
- TemplateComponentConnector.cs
- CompoundFileIOPermission.cs
- HttpResponse.cs
- GAC.cs
- FontFamilyConverter.cs
- StrongNameMembershipCondition.cs
- querybuilder.cs
- DataViewSettingCollection.cs
- TraceSource.cs
- XmlSchemaSimpleContent.cs
- FixedFlowMap.cs
- ClassDataContract.cs
- SerializationAttributes.cs
- WebPartEditVerb.cs
- MachineSettingsSection.cs
- DBSqlParser.cs
- FrameworkTemplate.cs
- DataBinding.cs
- ScrollBarRenderer.cs
- MultiPageTextView.cs
- MarshalDirectiveException.cs
- ResolveDuplexAsyncResult.cs
- InstancePersistenceEvent.cs
- AdjustableArrowCap.cs
- ProfileService.cs
- CheckBox.cs
- SequentialUshortCollection.cs
- WindowsGraphics.cs
- NetCodeGroup.cs
- ZipFileInfoCollection.cs
- App.cs
- GetPageCompletedEventArgs.cs
- ConfigXmlComment.cs
- TablePattern.cs
- BamlRecordReader.cs
- VisualBrush.cs
- ConcurrentDictionary.cs
- NativeActivityContext.cs
- BulletChrome.cs
- OutOfMemoryException.cs
- XmlUrlResolver.cs
- MenuItemCollection.cs
- SiteMapNode.cs
- StandardOleMarshalObject.cs
- SubpageParagraph.cs
- TableParagraph.cs
- SuppressMessageAttribute.cs
- FileDetails.cs
- TiffBitmapEncoder.cs
- XmlSchemaComplexContentExtension.cs
- PolicyUnit.cs
- MobileControlsSectionHandler.cs
- PropertyItemInternal.cs
- TypeContext.cs
- sqlstateclientmanager.cs
- XDRSchema.cs