Code:
/ Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / Orcas / SP / wpf / src / Framework / MS / Internal / Annotations / AnnotationObservableCollection.cs / 1 / AnnotationObservableCollection.cs
//---------------------------------------------------------------------------- // //// Copyright (C) 2003 by Microsoft Corporation. All rights reserved. // // // // Description: Subclass of ObservableCollectionwhich also registers for // INotifyPropertyChanged on each of its items (if T implements // INotifyPropertyChanged) and passes on the events via the // ItemChanged event. // // History: // 03/10/2005 : rruiz - created // //--------------------------------------------------------------------------- using System; using System.Collections; using System.Collections.Generic; using System.Collections.ObjectModel; using System.Collections.Specialized; using System.ComponentModel; using System.Diagnostics; using System.Windows; using System.Windows.Data; namespace MS.Internal.Annotations { // An internal extension of INotifyPropertyChanged introduced in order to keep // our use of it internal and not publicly expose this interface on our OM. internal interface INotifyPropertyChanged2 : INotifyPropertyChanged { } /// /// internal class AnnotationObservableCollection: ObservableCollection where T : INotifyPropertyChanged2, IOwnedObject { //----------------------------------------------------- // // Constructors // //----------------------------------------------------- #region Constructors /// /// Initializes a new instance of AnnotationObservableCollection that is empty and has default initial capacity. /// public AnnotationObservableCollection() : base() { _listener = new PropertyChangedEventHandler(OnItemPropertyChanged); } ////// Initializes a new instance of the AnnotationObservableCollection class /// that contains elements copied from the specified list /// /// The list whose elements are copied to the new list. ////// The elements are copied onto the AnnotationObservableCollection in the /// same order they are read by the enumerator of the list. /// ///list is a null reference public AnnotationObservableCollection(Listlist) : base(list) { _listener = new PropertyChangedEventHandler(OnItemPropertyChanged); } #endregion Constructors //------------------------------------------------------ // // Public Events // //----------------------------------------------------- //------------------------------------------------------ // // Protected Methods // //------------------------------------------------------ #region Protected Methods /// /// called by base class Collection<T> when the list is being cleared; /// raises a CollectionChanged event to any listeners /// protected override void ClearItems() { foreach (INotifyPropertyChanged2 item in this) { SetOwned(item, false); } ProtectedClearItems(); } ////// called by base class Collection<T> when an item is removed from list; /// raises a CollectionChanged event to any listeners /// protected override void RemoveItem(int index) { T removedItem = this[index]; SetOwned(removedItem, false); base.RemoveItem(index); } ////// called by base class Collection<T> when an item is added to list; /// raises a CollectionChanged event to any listeners /// protected override void InsertItem(int index, T item) { if (ItemOwned(item)) throw new ArgumentException(SR.Get(SRID.AlreadyHasParent)); base.InsertItem(index, item); SetOwned(item, true); } ////// called by base class Collection<T> when an item is added to list; /// raises a CollectionChanged event to any listeners /// protected override void SetItem(int index, T item) { if (ItemOwned(item)) throw new ArgumentException(SR.Get(SRID.AlreadyHasParent)); T originalItem = this[index]; SetOwned(originalItem, false); ProtectedSetItem(index, item); SetOwned(item, true); } ////// Virtual methods allowing subclasses to change the eventing /// behavior for the ClearItems method. The default behavior /// is to call ObservableCollection's method. /// protected virtual void ProtectedClearItems() { // Use the standard built-in event base.ClearItems(); } ////// Virtual methods allowing subclasses to change the eventing /// behavior for the SetItem method. The default behavior /// is to call Collection's defaut method and fire a single /// event. /// /// index of the item being set /// item to set at that index protected virtual void ProtectedSetItem(int index, T item) { // We only want to fire one event here - this collection contains items that // are within a Resource so an assignment means one resource change, period. Items[index] = item; // directly set Collectioninner Items collection OnPropertyChanged(new PropertyChangedEventArgs(CountString)); OnPropertyChanged(new PropertyChangedEventArgs(IndexerName)); OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Reset)); } /// /// Allows subclasses to call superclass's SetItem method without /// any additional functionality added by this class. /// /// index of item being set /// item to set in that index protected void ObservableCollectionSetItem(int index, T item) { base.SetItem(index, item); } // raise CollectionChanged event to any listeners ////// When an item we contain fires a PropertyChanged event we fire /// a collection changed event letting listeners know the collection /// has changed in some way. We don't care about the particulars of /// the event - just want to pass up the chain of objects that something /// has changed. /// /// the object whose property changed /// the event args describing the property that changed protected virtual void OnItemPropertyChanged(object sender, PropertyChangedEventArgs e) { OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Reset)); } #endregion Protected Methods //----------------------------------------------------- // // Private Methods // //------------------------------------------------------ #region Private Methods // returns whether this item already belongs to a parent object private bool ItemOwned(Object item) { if (item != null) { IOwnedObject obj = item as IOwnedObject; return obj.Owned; } return false; } // sets whether this object belongs to a parent object private void SetOwned(Object item, bool owned) { if (item != null) { IOwnedObject obj = item as IOwnedObject; obj.Owned = owned; if (owned) { ((INotifyPropertyChanged2)item).PropertyChanged += _listener; } else { ((INotifyPropertyChanged2)item).PropertyChanged -= _listener; } } } #endregion Private Methods //----------------------------------------------------- // // Private Fields // //----------------------------------------------------- #region Private & Internal Fields private readonly PropertyChangedEventHandler _listener = null; internal readonly string CountString = "Count"; internal readonly string IndexerName = "Item[]"; #endregion Private & Internal Fields } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved. //---------------------------------------------------------------------------- // //// Copyright (C) 2003 by Microsoft Corporation. All rights reserved. // // // // Description: Subclass of ObservableCollectionwhich also registers for // INotifyPropertyChanged on each of its items (if T implements // INotifyPropertyChanged) and passes on the events via the // ItemChanged event. // // History: // 03/10/2005 : rruiz - created // //--------------------------------------------------------------------------- using System; using System.Collections; using System.Collections.Generic; using System.Collections.ObjectModel; using System.Collections.Specialized; using System.ComponentModel; using System.Diagnostics; using System.Windows; using System.Windows.Data; namespace MS.Internal.Annotations { // An internal extension of INotifyPropertyChanged introduced in order to keep // our use of it internal and not publicly expose this interface on our OM. internal interface INotifyPropertyChanged2 : INotifyPropertyChanged { } /// /// internal class AnnotationObservableCollection: ObservableCollection where T : INotifyPropertyChanged2, IOwnedObject { //----------------------------------------------------- // // Constructors // //----------------------------------------------------- #region Constructors /// /// Initializes a new instance of AnnotationObservableCollection that is empty and has default initial capacity. /// public AnnotationObservableCollection() : base() { _listener = new PropertyChangedEventHandler(OnItemPropertyChanged); } ////// Initializes a new instance of the AnnotationObservableCollection class /// that contains elements copied from the specified list /// /// The list whose elements are copied to the new list. ////// The elements are copied onto the AnnotationObservableCollection in the /// same order they are read by the enumerator of the list. /// ///list is a null reference public AnnotationObservableCollection(Listlist) : base(list) { _listener = new PropertyChangedEventHandler(OnItemPropertyChanged); } #endregion Constructors //------------------------------------------------------ // // Public Events // //----------------------------------------------------- //------------------------------------------------------ // // Protected Methods // //------------------------------------------------------ #region Protected Methods /// /// called by base class Collection<T> when the list is being cleared; /// raises a CollectionChanged event to any listeners /// protected override void ClearItems() { foreach (INotifyPropertyChanged2 item in this) { SetOwned(item, false); } ProtectedClearItems(); } ////// called by base class Collection<T> when an item is removed from list; /// raises a CollectionChanged event to any listeners /// protected override void RemoveItem(int index) { T removedItem = this[index]; SetOwned(removedItem, false); base.RemoveItem(index); } ////// called by base class Collection<T> when an item is added to list; /// raises a CollectionChanged event to any listeners /// protected override void InsertItem(int index, T item) { if (ItemOwned(item)) throw new ArgumentException(SR.Get(SRID.AlreadyHasParent)); base.InsertItem(index, item); SetOwned(item, true); } ////// called by base class Collection<T> when an item is added to list; /// raises a CollectionChanged event to any listeners /// protected override void SetItem(int index, T item) { if (ItemOwned(item)) throw new ArgumentException(SR.Get(SRID.AlreadyHasParent)); T originalItem = this[index]; SetOwned(originalItem, false); ProtectedSetItem(index, item); SetOwned(item, true); } ////// Virtual methods allowing subclasses to change the eventing /// behavior for the ClearItems method. The default behavior /// is to call ObservableCollection's method. /// protected virtual void ProtectedClearItems() { // Use the standard built-in event base.ClearItems(); } ////// Virtual methods allowing subclasses to change the eventing /// behavior for the SetItem method. The default behavior /// is to call Collection's defaut method and fire a single /// event. /// /// index of the item being set /// item to set at that index protected virtual void ProtectedSetItem(int index, T item) { // We only want to fire one event here - this collection contains items that // are within a Resource so an assignment means one resource change, period. Items[index] = item; // directly set Collectioninner Items collection OnPropertyChanged(new PropertyChangedEventArgs(CountString)); OnPropertyChanged(new PropertyChangedEventArgs(IndexerName)); OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Reset)); } /// /// Allows subclasses to call superclass's SetItem method without /// any additional functionality added by this class. /// /// index of item being set /// item to set in that index protected void ObservableCollectionSetItem(int index, T item) { base.SetItem(index, item); } // raise CollectionChanged event to any listeners ////// When an item we contain fires a PropertyChanged event we fire /// a collection changed event letting listeners know the collection /// has changed in some way. We don't care about the particulars of /// the event - just want to pass up the chain of objects that something /// has changed. /// /// the object whose property changed /// the event args describing the property that changed protected virtual void OnItemPropertyChanged(object sender, PropertyChangedEventArgs e) { OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Reset)); } #endregion Protected Methods //----------------------------------------------------- // // Private Methods // //------------------------------------------------------ #region Private Methods // returns whether this item already belongs to a parent object private bool ItemOwned(Object item) { if (item != null) { IOwnedObject obj = item as IOwnedObject; return obj.Owned; } return false; } // sets whether this object belongs to a parent object private void SetOwned(Object item, bool owned) { if (item != null) { IOwnedObject obj = item as IOwnedObject; obj.Owned = owned; if (owned) { ((INotifyPropertyChanged2)item).PropertyChanged += _listener; } else { ((INotifyPropertyChanged2)item).PropertyChanged -= _listener; } } } #endregion Private Methods //----------------------------------------------------- // // Private Fields // //----------------------------------------------------- #region Private & Internal Fields private readonly PropertyChangedEventHandler _listener = null; internal readonly string CountString = "Count"; internal readonly string IndexerName = "Item[]"; #endregion Private & Internal Fields } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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
- BinaryVersion.cs
- LogRestartAreaEnumerator.cs
- BindingOperations.cs
- DataObjectCopyingEventArgs.cs
- CodeTypeConstructor.cs
- ToolStripRenderer.cs
- InfoCardKeyedHashAlgorithm.cs
- DelegatingConfigHost.cs
- CreateParams.cs
- ColorEditor.cs
- ADMembershipUser.cs
- DeploymentSection.cs
- InputMethodStateTypeInfo.cs
- UiaCoreApi.cs
- FilterableAttribute.cs
- ToolStripSystemRenderer.cs
- HandlerBase.cs
- TablePattern.cs
- JavaScriptObjectDeserializer.cs
- RefreshEventArgs.cs
- XmlSchemaSimpleType.cs
- PerformanceCounterPermissionEntry.cs
- Utilities.cs
- ProviderBase.cs
- Rotation3DKeyFrameCollection.cs
- TypeUtil.cs
- PageVisual.cs
- AppDomain.cs
- PolicyImporterElementCollection.cs
- SafeBitVector32.cs
- precedingquery.cs
- safex509handles.cs
- WindowsHyperlink.cs
- RepeaterItemCollection.cs
- DataControlPagerLinkButton.cs
- Messages.cs
- OracleParameterBinding.cs
- WsdlExporter.cs
- JsonEnumDataContract.cs
- CssTextWriter.cs
- DataGridViewCellFormattingEventArgs.cs
- EditorOptionAttribute.cs
- GridViewColumnHeaderAutomationPeer.cs
- OuterGlowBitmapEffect.cs
- CertificateReferenceElement.cs
- ParserOptions.cs
- ZipPackage.cs
- BuildProviderCollection.cs
- VSWCFServiceContractGenerator.cs
- TextContainerChangedEventArgs.cs
- OpCopier.cs
- MediaCommands.cs
- Italic.cs
- EntityDataSourceUtil.cs
- OutputScope.cs
- AttributeData.cs
- EdmFunction.cs
- TextFormatter.cs
- ConnectionsZone.cs
- CategoryGridEntry.cs
- GPPOINTF.cs
- PriorityQueue.cs
- ListDictionaryInternal.cs
- ModuleElement.cs
- DiscreteKeyFrames.cs
- PropertyItem.cs
- SystemResourceKey.cs
- OpacityConverter.cs
- ModuleBuilder.cs
- StateRuntime.cs
- GridViewActionList.cs
- ServicePointManager.cs
- InvokePattern.cs
- Underline.cs
- DrawingContextDrawingContextWalker.cs
- TokenBasedSetEnumerator.cs
- ErrorProvider.cs
- UserMapPath.cs
- CookieParameter.cs
- ExternalCalls.cs
- DelegatingTypeDescriptionProvider.cs
- CacheOutputQuery.cs
- ClickablePoint.cs
- FontWeightConverter.cs
- SqlFileStream.cs
- HttpBufferlessInputStream.cs
- SimpleFieldTemplateUserControl.cs
- HttpListenerElement.cs
- EventLogInformation.cs
- AnimationClock.cs
- Button.cs
- TileBrush.cs
- SizeFConverter.cs
- ThemeDictionaryExtension.cs
- TcpChannelHelper.cs
- Latin1Encoding.cs
- GeneralTransformGroup.cs
- ECDsa.cs
- ProgressBarRenderer.cs
- serverconfig.cs