Code:
/ Dotnetfx_Vista_SP2 / Dotnetfx_Vista_SP2 / 8.0.50727.4016 / DEVDIV / depot / DevDiv / releases / Orcas / QFE / wpf / src / Framework / System / Windows / Data / CollectionContainer.cs / 1 / CollectionContainer.cs
//----------------------------------------------------------------------------
//
//
// Copyright (C) 2003 by Microsoft Corporation. All rights reserved.
//
//
//
// Description: Holds an existing collection structure
// (e.g. ObservableCollection or DataSet) inside the ItemCollection.
//
// See specs at http://avalon/connecteddata/M5%20General%20Docs/ItemCollection.mht
// http://avalon/connecteddata/M5%20Specs/IDataCollection.mht
//
// History:
// 07/14/2003 : [....] - Created
//
//---------------------------------------------------------------------------
using System.Collections;
using System.Collections.Specialized;
using System.ComponentModel;
using System.Diagnostics;
using System.Windows;
using System.Windows.Controls;
using MS.Utility;
using MS.Internal; // Invariant.Assert
using MS.Internal.Utility;
using MS.Internal.Data; // IndexedEnumerable
using System;
namespace System.Windows.Data
{
///
/// Holds an existing collection structure
/// (e.g. ObservableCollection or DataSet) for use under a CompositeCollection.
///
public class CollectionContainer : DependencyObject, INotifyCollectionChanged, IWeakEventListener
{
//-----------------------------------------------------
//
// Dynamic properties and events
//
//-----------------------------------------------------
///
/// Collection to be added into flattened ItemCollection
///
public static readonly DependencyProperty CollectionProperty =
DependencyProperty.Register(
"Collection",
typeof(IEnumerable),
typeof(CollectionContainer),
new FrameworkPropertyMetadata(new PropertyChangedCallback(OnCollectionChanged)));
//------------------------------------------------------
//
// Constructors
//
//-----------------------------------------------------
static CollectionContainer()
{
}
//------------------------------------------------------
//
// Public Properties
//
//------------------------------------------------------
#region Public Properties
//ISSUE/[....]/030820 perf will potentially degrade if assigned collection
// is only IEnumerable, but will improve if it
// implements ICollection (for Count property), or,
// better yet IList (for IndexOf and forward/backward enum using indexer)
///
/// Collection to be added into flattened ItemCollection.
///
public IEnumerable Collection
{
get { return (IEnumerable) GetValue(CollectionContainer.CollectionProperty); }
set { SetValue(CollectionContainer.CollectionProperty, value); }
}
///
/// This method is used by TypeDescriptor to determine if this property should
/// be serialized.
///
[EditorBrowsable(EditorBrowsableState.Never)]
public bool ShouldSerializeCollection()
{
if (Collection == null)
{
return false;
}
// Try to see if there is an item in the Collection without
// creating an enumerator.
ICollection collection = Collection as ICollection;
if (collection != null && collection.Count == 0)
{
return false;
}
// If MoveNext returns true, then the enumerator is non-empty.
IEnumerator enumerator = Collection.GetEnumerator();
return enumerator.MoveNext();
}
#endregion Public Properties
//-----------------------------------------------------
//
// Internal Properties
//
//------------------------------------------------------
#region Internal Properties
internal ICollectionView View
{
get
{
return _view;
}
}
internal int ViewCount
{
get
{
if (View == null)
return 0;
CollectionView cv = View as CollectionView;
if (cv != null)
return cv.Count;
ICollection coll = View as ICollection;
if (coll != null)
return coll.Count;
// As a last resort, use the IList interface or IndexedEnumerable to find the count.
if (ViewList != null)
return ViewList.Count;
return 0;
}
}
internal bool ViewIsEmpty
{
get
{
if (View == null)
return true;
ICollectionView cv = View as ICollectionView;
if (cv != null)
return cv.IsEmpty;
ICollection coll = View as ICollection;
if (coll != null)
return (coll.Count == 0);
// As a last resort, use the IList interface or IndexedEnumerable to find the count.
if (ViewList != null)
{
IndexedEnumerable le = ViewList as IndexedEnumerable;
if (le != null)
return le.IsEmpty;
else
return (ViewList.Count == 0);
}
return true;
}
}
#endregion Internal Properties
//-----------------------------------------------------
//
// Internal Methods
//
//-----------------------------------------------------
#region Internal Methods
internal object ViewItem(int index)
{
Invariant.Assert(index >= 0 && View != null);
CollectionView cv = View as CollectionView;
if (cv != null)
{
return cv.GetItemAt(index);
}
// As a last resort, use the IList interface or IndexedEnumerable to iterate to the nth item.
if (ViewList != null)
return ViewList[index];
return null;
}
internal int ViewIndexOf(object item)
{
if (View == null)
return -1;
CollectionView cv = View as CollectionView;
if (cv != null)
{
return cv.IndexOf(item);
}
// As a last resort, use the IList interface or IndexedEnumerable to look for the item.
if (ViewList != null)
return ViewList.IndexOf(item);
return -1;
}
#endregion Internal Methods
#region INotifyCollectionChanged
///
/// Occurs when the contained collection changes
///
event NotifyCollectionChangedEventHandler INotifyCollectionChanged.CollectionChanged
{
add { CollectionChanged += value; }
remove { CollectionChanged -= value; }
}
///
/// Occurs when the contained collection changes
///
protected virtual event NotifyCollectionChangedEventHandler CollectionChanged;
///
/// Called when the contained collection changes
///
protected virtual void OnContainedCollectionChanged(NotifyCollectionChangedEventArgs args)
{
if (CollectionChanged != null)
CollectionChanged(this, args);
}
#endregion INotifyCollectionChanged
#region IWeakEventListener
///
/// Handle events from the centralized event table
///
bool IWeakEventListener.ReceiveWeakEvent(Type managerType, object sender, EventArgs e)
{
return ReceiveWeakEvent(managerType, sender, e);
}
///
/// Handle events from the centralized event table
///
protected virtual bool ReceiveWeakEvent(Type managerType, object sender, EventArgs e)
{
if (managerType == typeof(CollectionChangedEventManager))
{
// forward the event to CompositeCollections that use this container
OnContainedCollectionChanged((NotifyCollectionChangedEventArgs)e);
}
else
{
return false; // unrecognized event
}
return true;
}
#endregion IWeakEventListener
//-----------------------------------------------------
//
// Private Properties
//
//------------------------------------------------------
#region Private Properties
private IndexedEnumerable ViewList
{
get
{
if (_viewList == null && View != null)
{
_viewList = new IndexedEnumerable(View);
}
return _viewList;
}
}
#endregion
//-----------------------------------------------------
//
// Private Methods
//
//------------------------------------------------------
#region Private Methods
// called when value of CollectionProperty is required by property store
private static object OnGetCollection(DependencyObject d)
{
return ((CollectionContainer) d).Collection;
}
// Called when CollectionProperty is changed on "d."
private static void OnCollectionChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
CollectionContainer cc = (CollectionContainer) d;
cc.HookUpToCollection((IEnumerable) e.NewValue, true);
}
// To prevent CollectionContainer memory leak:
// HookUpToCollection() is called to start listening to CV only when
// the Container is being used by a CompositeCollectionView.
// When the last CCV stops using the container (or the CCV is GC'ed),
// HookUpToCollection() is called to stop listening to its CV, so that
// this container can be GC'ed if no one else is holding on to it.
// unhook old collection/view and hook up new collection/view
private void HookUpToCollection(IEnumerable newCollection, bool shouldRaiseChangeEvent)
{
// clear cached helper
_viewList = null;
// unhook from the old collection view
if (View != null)
{
CollectionChangedEventManager.RemoveListener(View, this);
if (_traceLog != null)
_traceLog.Add("Unsubscribe to CollectionChange from {0}",
TraceLog.IdFor(View));
}
// change to the new view
if (newCollection != null)
_view = CollectionViewSource.GetDefaultCollectionView(newCollection, this);
else
_view = null;
// hook up to the new collection view
if (View != null)
{
CollectionChangedEventManager.AddListener(View, this);
if (_traceLog != null)
_traceLog.Add("Subscribe to CollectionChange from {0}", TraceLog.IdFor(View));
}
if (shouldRaiseChangeEvent) // it's as if this were a refresh of the container's collection
OnContainedCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Reset));
}
#endregion Private Methods
// this method is here just to avoid the compiler error
// error CS0649: Warning as Error: Field '..._traceLog' is never assigned to, and will always have its default value null
void InitializeTraceLog()
{
_traceLog = new TraceLog(20);
}
//------------------------------------------------------
//
// Private Fields
//
//-----------------------------------------------------
#region Private Fields
private TraceLog _traceLog;
private ICollectionView _view;
private IndexedEnumerable _viewList; // cache of list wrapper for view
#endregion Private 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: Holds an existing collection structure
// (e.g. ObservableCollection or DataSet) inside the ItemCollection.
//
// See specs at http://avalon/connecteddata/M5%20General%20Docs/ItemCollection.mht
// http://avalon/connecteddata/M5%20Specs/IDataCollection.mht
//
// History:
// 07/14/2003 : [....] - Created
//
//---------------------------------------------------------------------------
using System.Collections;
using System.Collections.Specialized;
using System.ComponentModel;
using System.Diagnostics;
using System.Windows;
using System.Windows.Controls;
using MS.Utility;
using MS.Internal; // Invariant.Assert
using MS.Internal.Utility;
using MS.Internal.Data; // IndexedEnumerable
using System;
namespace System.Windows.Data
{
///
/// Holds an existing collection structure
/// (e.g. ObservableCollection or DataSet) for use under a CompositeCollection.
///
public class CollectionContainer : DependencyObject, INotifyCollectionChanged, IWeakEventListener
{
//-----------------------------------------------------
//
// Dynamic properties and events
//
//-----------------------------------------------------
///
/// Collection to be added into flattened ItemCollection
///
public static readonly DependencyProperty CollectionProperty =
DependencyProperty.Register(
"Collection",
typeof(IEnumerable),
typeof(CollectionContainer),
new FrameworkPropertyMetadata(new PropertyChangedCallback(OnCollectionChanged)));
//------------------------------------------------------
//
// Constructors
//
//-----------------------------------------------------
static CollectionContainer()
{
}
//------------------------------------------------------
//
// Public Properties
//
//------------------------------------------------------
#region Public Properties
//ISSUE/[....]/030820 perf will potentially degrade if assigned collection
// is only IEnumerable, but will improve if it
// implements ICollection (for Count property), or,
// better yet IList (for IndexOf and forward/backward enum using indexer)
///
/// Collection to be added into flattened ItemCollection.
///
public IEnumerable Collection
{
get { return (IEnumerable) GetValue(CollectionContainer.CollectionProperty); }
set { SetValue(CollectionContainer.CollectionProperty, value); }
}
///
/// This method is used by TypeDescriptor to determine if this property should
/// be serialized.
///
[EditorBrowsable(EditorBrowsableState.Never)]
public bool ShouldSerializeCollection()
{
if (Collection == null)
{
return false;
}
// Try to see if there is an item in the Collection without
// creating an enumerator.
ICollection collection = Collection as ICollection;
if (collection != null && collection.Count == 0)
{
return false;
}
// If MoveNext returns true, then the enumerator is non-empty.
IEnumerator enumerator = Collection.GetEnumerator();
return enumerator.MoveNext();
}
#endregion Public Properties
//-----------------------------------------------------
//
// Internal Properties
//
//------------------------------------------------------
#region Internal Properties
internal ICollectionView View
{
get
{
return _view;
}
}
internal int ViewCount
{
get
{
if (View == null)
return 0;
CollectionView cv = View as CollectionView;
if (cv != null)
return cv.Count;
ICollection coll = View as ICollection;
if (coll != null)
return coll.Count;
// As a last resort, use the IList interface or IndexedEnumerable to find the count.
if (ViewList != null)
return ViewList.Count;
return 0;
}
}
internal bool ViewIsEmpty
{
get
{
if (View == null)
return true;
ICollectionView cv = View as ICollectionView;
if (cv != null)
return cv.IsEmpty;
ICollection coll = View as ICollection;
if (coll != null)
return (coll.Count == 0);
// As a last resort, use the IList interface or IndexedEnumerable to find the count.
if (ViewList != null)
{
IndexedEnumerable le = ViewList as IndexedEnumerable;
if (le != null)
return le.IsEmpty;
else
return (ViewList.Count == 0);
}
return true;
}
}
#endregion Internal Properties
//-----------------------------------------------------
//
// Internal Methods
//
//-----------------------------------------------------
#region Internal Methods
internal object ViewItem(int index)
{
Invariant.Assert(index >= 0 && View != null);
CollectionView cv = View as CollectionView;
if (cv != null)
{
return cv.GetItemAt(index);
}
// As a last resort, use the IList interface or IndexedEnumerable to iterate to the nth item.
if (ViewList != null)
return ViewList[index];
return null;
}
internal int ViewIndexOf(object item)
{
if (View == null)
return -1;
CollectionView cv = View as CollectionView;
if (cv != null)
{
return cv.IndexOf(item);
}
// As a last resort, use the IList interface or IndexedEnumerable to look for the item.
if (ViewList != null)
return ViewList.IndexOf(item);
return -1;
}
#endregion Internal Methods
#region INotifyCollectionChanged
///
/// Occurs when the contained collection changes
///
event NotifyCollectionChangedEventHandler INotifyCollectionChanged.CollectionChanged
{
add { CollectionChanged += value; }
remove { CollectionChanged -= value; }
}
///
/// Occurs when the contained collection changes
///
protected virtual event NotifyCollectionChangedEventHandler CollectionChanged;
///
/// Called when the contained collection changes
///
protected virtual void OnContainedCollectionChanged(NotifyCollectionChangedEventArgs args)
{
if (CollectionChanged != null)
CollectionChanged(this, args);
}
#endregion INotifyCollectionChanged
#region IWeakEventListener
///
/// Handle events from the centralized event table
///
bool IWeakEventListener.ReceiveWeakEvent(Type managerType, object sender, EventArgs e)
{
return ReceiveWeakEvent(managerType, sender, e);
}
///
/// Handle events from the centralized event table
///
protected virtual bool ReceiveWeakEvent(Type managerType, object sender, EventArgs e)
{
if (managerType == typeof(CollectionChangedEventManager))
{
// forward the event to CompositeCollections that use this container
OnContainedCollectionChanged((NotifyCollectionChangedEventArgs)e);
}
else
{
return false; // unrecognized event
}
return true;
}
#endregion IWeakEventListener
//-----------------------------------------------------
//
// Private Properties
//
//------------------------------------------------------
#region Private Properties
private IndexedEnumerable ViewList
{
get
{
if (_viewList == null && View != null)
{
_viewList = new IndexedEnumerable(View);
}
return _viewList;
}
}
#endregion
//-----------------------------------------------------
//
// Private Methods
//
//------------------------------------------------------
#region Private Methods
// called when value of CollectionProperty is required by property store
private static object OnGetCollection(DependencyObject d)
{
return ((CollectionContainer) d).Collection;
}
// Called when CollectionProperty is changed on "d."
private static void OnCollectionChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
CollectionContainer cc = (CollectionContainer) d;
cc.HookUpToCollection((IEnumerable) e.NewValue, true);
}
// To prevent CollectionContainer memory leak:
// HookUpToCollection() is called to start listening to CV only when
// the Container is being used by a CompositeCollectionView.
// When the last CCV stops using the container (or the CCV is GC'ed),
// HookUpToCollection() is called to stop listening to its CV, so that
// this container can be GC'ed if no one else is holding on to it.
// unhook old collection/view and hook up new collection/view
private void HookUpToCollection(IEnumerable newCollection, bool shouldRaiseChangeEvent)
{
// clear cached helper
_viewList = null;
// unhook from the old collection view
if (View != null)
{
CollectionChangedEventManager.RemoveListener(View, this);
if (_traceLog != null)
_traceLog.Add("Unsubscribe to CollectionChange from {0}",
TraceLog.IdFor(View));
}
// change to the new view
if (newCollection != null)
_view = CollectionViewSource.GetDefaultCollectionView(newCollection, this);
else
_view = null;
// hook up to the new collection view
if (View != null)
{
CollectionChangedEventManager.AddListener(View, this);
if (_traceLog != null)
_traceLog.Add("Subscribe to CollectionChange from {0}", TraceLog.IdFor(View));
}
if (shouldRaiseChangeEvent) // it's as if this were a refresh of the container's collection
OnContainedCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Reset));
}
#endregion Private Methods
// this method is here just to avoid the compiler error
// error CS0649: Warning as Error: Field '..._traceLog' is never assigned to, and will always have its default value null
void InitializeTraceLog()
{
_traceLog = new TraceLog(20);
}
//------------------------------------------------------
//
// Private Fields
//
//-----------------------------------------------------
#region Private Fields
private TraceLog _traceLog;
private ICollectionView _view;
private IndexedEnumerable _viewList; // cache of list wrapper for view
#endregion Private Fields
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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