Code:
/ Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / Orcas / SP / wpf / src / Framework / System / Windows / Automation / Peers / ItemsControlAutomationPeer.cs / 1 / ItemsControlAutomationPeer.cs
using System;
using System.Collections;
using System.Collections.ObjectModel;
using System.Collections.Generic;
using System.Runtime.InteropServices;
using System.Security;
using System.Text;
using System.Windows;
using System.Windows.Automation.Provider;
using System.Windows.Controls;
using System.Windows.Controls.Primitives;
using System.Windows.Data;
using System.Windows.Interop;
using System.Windows.Media;
using MS.Internal;
using MS.Internal.Hashing.PresentationFramework; // HashHelper
using MS.Win32;
namespace System.Windows.Automation.Peers
{
///
public abstract class ItemsControlAutomationPeer : FrameworkElementAutomationPeer
{
///
protected ItemsControlAutomationPeer(ItemsControl owner): base(owner)
{}
///
override public object GetPattern(PatternInterface patternInterface)
{
if(patternInterface == PatternInterface.Scroll)
{
ItemsControl owner = (ItemsControl)Owner;
if(owner.ScrollHost != null)
{
AutomationPeer scrollPeer = UIElementAutomationPeer.CreatePeerForElement(owner.ScrollHost);
if(scrollPeer != null && scrollPeer is IScrollProvider)
{
scrollPeer.EventsSource = this;
return (IScrollProvider)scrollPeer;
}
}
}
return base.GetPattern(patternInterface);
}
///
protected override List GetChildrenCore()
{
ItemsControl owner = (ItemsControl)Owner;
ItemCollection items = owner.Items;
ItemPeersStorage oldChildren = _dataChildren; //cache the old ones for possible reuse
_dataChildren = new ItemPeersStorage();
if (owner.IsGrouping)
{
CollectionView cv = owner.Items.CollectionView;
ReadOnlyObservableCollection groups = (cv != null) ? cv.Groups : null;
if (groups != null)
{
List children = new List(groups.Count);
for (int i = 0; i < groups.Count; i++)
{
object group = groups[i];
GroupItem groupItem = owner.ItemContainerGenerator.ContainerFromItem(group) as GroupItem;
if (groupItem != null)
{
GroupItemAutomationPeer peer = groupItem.CreateAutomationPeer() as GroupItemAutomationPeer;
if (peer != null)
children.Add(peer);
}
}
return children;
}
return base.GetChildrenCore();
}
else if(items.Count > 0)
{
List children = new List(items.Count);
foreach(object item in items)
{
//try to reuse old peer if it exists
ItemAutomationPeer peer = oldChildren[item];
//no old peer - create new one
if(peer == null)
peer = CreateItemAutomationPeer(item);
//perform hookup so the events sourced from wrapper peer are fired as if from the data item
if(peer != null)
{
AutomationPeer wrapperPeer = peer.GetWrapperPeer();
if(wrapperPeer != null)
wrapperPeer.EventsSource = peer;
}
//protection from indistinguishable items - for example, 2 strings with same value
//this scenario does not work in ItemsControl however is not checked for.
if (_dataChildren[item] == null)
{
children.Add(peer);
_dataChildren[item] = peer;
}
}
return children;
}
return null;
}
// Called by GroupItemAutomationPeer
internal ItemAutomationPeer CreateItemAutomationPeerInternal(object item)
{
return CreateItemAutomationPeer(item);
}
///
abstract protected ItemAutomationPeer CreateItemAutomationPeer(object item);
// Derived classes should be able to access peers cache
internal ItemPeersStorage ItemPeers
{
get { return _dataChildren; }
}
private ItemPeersStorage _dataChildren = new ItemPeersStorage();
}
internal class ItemPeersStorage
{
public ItemPeersStorage()
{
}
public void Clear()
{
_usesHashCode = false;
_count = 0;
if (_hashtable != null)
_hashtable.Clear();
if (_list != null)
_list.Clear();
}
public ItemAutomationPeer this[object item]
{
get
{
if (_count == 0 || item == null)
return null;
if (_usesHashCode)
{
if (_hashtable == null)
return null;
return _hashtable[item] as ItemAutomationPeer;
}
else
{
if (_list == null)
return null;
for (int i = 0; i < _list.Count; i++)
{
KeyValuePair pair = _list[i];
if (Object.Equals(item, pair.Key))
return pair.Value;
}
return null;
}
}
set
{
// Does not cache null items
if (item == null)
return;
// When we add the first item we need to determine whether to use hashtable or list
if (_count == 0)
{
_usesHashCode = item != null && HashHelper.HasReliableHashCode(item);
}
if (_usesHashCode)
{
if (_hashtable == null)
_hashtable = new Hashtable();
_hashtable[item] = value;
}
else
{
if (_list == null)
_list = new List>();
_list.Add(new KeyValuePair(item, value));
}
_count++;
}
}
public int Count
{
get { return _count; }
}
private Hashtable _hashtable = null;
private List> _list = null;
private int _count = 0;
private bool _usesHashCode = false;
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
using System;
using System.Collections;
using System.Collections.ObjectModel;
using System.Collections.Generic;
using System.Runtime.InteropServices;
using System.Security;
using System.Text;
using System.Windows;
using System.Windows.Automation.Provider;
using System.Windows.Controls;
using System.Windows.Controls.Primitives;
using System.Windows.Data;
using System.Windows.Interop;
using System.Windows.Media;
using MS.Internal;
using MS.Internal.Hashing.PresentationFramework; // HashHelper
using MS.Win32;
namespace System.Windows.Automation.Peers
{
///
public abstract class ItemsControlAutomationPeer : FrameworkElementAutomationPeer
{
///
protected ItemsControlAutomationPeer(ItemsControl owner): base(owner)
{}
///
override public object GetPattern(PatternInterface patternInterface)
{
if(patternInterface == PatternInterface.Scroll)
{
ItemsControl owner = (ItemsControl)Owner;
if(owner.ScrollHost != null)
{
AutomationPeer scrollPeer = UIElementAutomationPeer.CreatePeerForElement(owner.ScrollHost);
if(scrollPeer != null && scrollPeer is IScrollProvider)
{
scrollPeer.EventsSource = this;
return (IScrollProvider)scrollPeer;
}
}
}
return base.GetPattern(patternInterface);
}
///
protected override List GetChildrenCore()
{
ItemsControl owner = (ItemsControl)Owner;
ItemCollection items = owner.Items;
ItemPeersStorage oldChildren = _dataChildren; //cache the old ones for possible reuse
_dataChildren = new ItemPeersStorage();
if (owner.IsGrouping)
{
CollectionView cv = owner.Items.CollectionView;
ReadOnlyObservableCollection groups = (cv != null) ? cv.Groups : null;
if (groups != null)
{
List children = new List(groups.Count);
for (int i = 0; i < groups.Count; i++)
{
object group = groups[i];
GroupItem groupItem = owner.ItemContainerGenerator.ContainerFromItem(group) as GroupItem;
if (groupItem != null)
{
GroupItemAutomationPeer peer = groupItem.CreateAutomationPeer() as GroupItemAutomationPeer;
if (peer != null)
children.Add(peer);
}
}
return children;
}
return base.GetChildrenCore();
}
else if(items.Count > 0)
{
List children = new List(items.Count);
foreach(object item in items)
{
//try to reuse old peer if it exists
ItemAutomationPeer peer = oldChildren[item];
//no old peer - create new one
if(peer == null)
peer = CreateItemAutomationPeer(item);
//perform hookup so the events sourced from wrapper peer are fired as if from the data item
if(peer != null)
{
AutomationPeer wrapperPeer = peer.GetWrapperPeer();
if(wrapperPeer != null)
wrapperPeer.EventsSource = peer;
}
//protection from indistinguishable items - for example, 2 strings with same value
//this scenario does not work in ItemsControl however is not checked for.
if (_dataChildren[item] == null)
{
children.Add(peer);
_dataChildren[item] = peer;
}
}
return children;
}
return null;
}
// Called by GroupItemAutomationPeer
internal ItemAutomationPeer CreateItemAutomationPeerInternal(object item)
{
return CreateItemAutomationPeer(item);
}
///
abstract protected ItemAutomationPeer CreateItemAutomationPeer(object item);
// Derived classes should be able to access peers cache
internal ItemPeersStorage ItemPeers
{
get { return _dataChildren; }
}
private ItemPeersStorage _dataChildren = new ItemPeersStorage();
}
internal class ItemPeersStorage
{
public ItemPeersStorage()
{
}
public void Clear()
{
_usesHashCode = false;
_count = 0;
if (_hashtable != null)
_hashtable.Clear();
if (_list != null)
_list.Clear();
}
public ItemAutomationPeer this[object item]
{
get
{
if (_count == 0 || item == null)
return null;
if (_usesHashCode)
{
if (_hashtable == null)
return null;
return _hashtable[item] as ItemAutomationPeer;
}
else
{
if (_list == null)
return null;
for (int i = 0; i < _list.Count; i++)
{
KeyValuePair pair = _list[i];
if (Object.Equals(item, pair.Key))
return pair.Value;
}
return null;
}
}
set
{
// Does not cache null items
if (item == null)
return;
// When we add the first item we need to determine whether to use hashtable or list
if (_count == 0)
{
_usesHashCode = item != null && HashHelper.HasReliableHashCode(item);
}
if (_usesHashCode)
{
if (_hashtable == null)
_hashtable = new Hashtable();
_hashtable[item] = value;
}
else
{
if (_list == null)
_list = new List>();
_list.Add(new KeyValuePair(item, value));
}
_count++;
}
}
public int Count
{
get { return _count; }
}
private Hashtable _hashtable = null;
private List> _list = null;
private int _count = 0;
private bool _usesHashCode = false;
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
