Code:
/ Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / Orcas / SP / wpf / src / Framework / MS / Internal / Data / CollectionViewGroupRoot.cs / 2 / 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
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- DocumentOrderQuery.cs
- ZipIOLocalFileHeader.cs
- PropertyChangedEventArgs.cs
- EntityDesignerBuildProvider.cs
- AdapterSwitches.cs
- SspiNegotiationTokenAuthenticatorState.cs
- ToolStripLabel.cs
- ProviderConnectionPoint.cs
- shaper.cs
- EventLog.cs
- TransformerTypeCollection.cs
- DataGridViewRowPostPaintEventArgs.cs
- GridViewPageEventArgs.cs
- DescendantOverDescendantQuery.cs
- PointConverter.cs
- ClientScriptManager.cs
- FilterableAttribute.cs
- EventData.cs
- Size3D.cs
- CompilerState.cs
- HttpModulesSection.cs
- CellParaClient.cs
- TextDecorationCollection.cs
- MonitoringDescriptionAttribute.cs
- ModelItemDictionaryImpl.cs
- CreateUserErrorEventArgs.cs
- WinFormsComponentEditor.cs
- TrustLevelCollection.cs
- DesignerSerializerAttribute.cs
- DataGridViewCellValueEventArgs.cs
- Rotation3D.cs
- FilterInvalidBodyAccessException.cs
- XpsS0ValidatingLoader.cs
- DateTimeStorage.cs
- ProcessManager.cs
- DispatcherFrame.cs
- GeneralTransform3D.cs
- CustomTypeDescriptor.cs
- TransactionManager.cs
- ProgressBarHighlightConverter.cs
- KeyValueConfigurationCollection.cs
- PageWrapper.cs
- InstanceOwner.cs
- DeclaredTypeElement.cs
- InlineCollection.cs
- InitiatorSessionSymmetricTransportSecurityProtocol.cs
- BaseProcessor.cs
- WriteFileContext.cs
- ResourcePart.cs
- FontWeightConverter.cs
- ListBase.cs
- GuidConverter.cs
- XmlResolver.cs
- SerializationInfoEnumerator.cs
- InvalidDataException.cs
- COM2FontConverter.cs
- LayoutDump.cs
- GeneralTransform3DGroup.cs
- TextViewSelectionProcessor.cs
- SecurityHeaderTokenResolver.cs
- CustomAttributeFormatException.cs
- LookupNode.cs
- AggregateNode.cs
- VectorKeyFrameCollection.cs
- SubMenuStyleCollectionEditor.cs
- HMACMD5.cs
- EndpointConfigContainer.cs
- CommandHelpers.cs
- KeyGestureValueSerializer.cs
- TableMethodGenerator.cs
- TagNameToTypeMapper.cs
- safelinkcollection.cs
- PaintValueEventArgs.cs
- XPathQilFactory.cs
- StringFunctions.cs
- AuthorizationSection.cs
- sqlcontext.cs
- AnnotationComponentChooser.cs
- PartialClassGenerationTask.cs
- SpellCheck.cs
- CodeConditionStatement.cs
- CustomBindingCollectionElement.cs
- BindingList.cs
- QuaternionAnimation.cs
- Graphics.cs
- invalidudtexception.cs
- UdpTransportSettings.cs
- AlternateView.cs
- TrustLevel.cs
- GregorianCalendar.cs
- DataGridViewCellMouseEventArgs.cs
- StructuralCache.cs
- SqlAliasesReferenced.cs
- Margins.cs
- EditorPartChrome.cs
- autovalidator.cs
- SoapServerMethod.cs
- FormViewCommandEventArgs.cs
- ConfigXmlAttribute.cs
- MultipleViewProviderWrapper.cs