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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
/***************************************************************************\
*
*
* A collection of TriggerAction objects to be associated with a Trigger
* object
*
*
\***************************************************************************/
using System.Collections; // IList
using System.Collections.Generic; // IList<T>
using MS.Internal;
using System.Diagnostics;
namespace System.Windows
{
/// <summary>
/// A set of TriggerAction for use in a Trigger object
/// </summary>
public sealed class TriggerActionCollection : IList, IList<TriggerAction>
{
///////////////////////////////////////////////////////////////////////
// Public members
/// <summary>
/// Creates a TriggerActionCollection
/// </summary>
public TriggerActionCollection()
{
_rawList = new List<TriggerAction>();
}
/// <summary>
/// Creates a TriggerActionCollection starting at the given size
/// </summary>
public TriggerActionCollection(int initialSize)
{
_rawList = new List<TriggerAction>(initialSize);
}
///////////////////////////////////////////////////////////////////////
// Public non-type-specific properties and methods that satisfy
// implementation requirements of both IList and IList<T>
/// <summary>
/// ICollection.Count
/// </summary>
public int Count
{
get
{
return _rawList.Count;
}
}
/// <summary>
/// IList.IsReadOnly
/// </summary>
public bool IsReadOnly
{
get
{
return _sealed;
}
}
/// <summary>
/// IList.Clear
/// </summary>
public void Clear()
{
CheckSealed();
for (int i = _rawList.Count - 1; i >= 0; i--)
{
InheritanceContextHelper.RemoveContextFromObject(_owner, _rawList[i]);
}
_rawList.Clear();
}
/// <summary>
/// IList.RemoveAt
/// </summary>
public void RemoveAt(int index)
{
CheckSealed();
TriggerAction oldValue = _rawList[index];
InheritanceContextHelper.RemoveContextFromObject(_owner, oldValue);
_rawList.RemoveAt(index);
}
///////////////////////////////////////////////////////////////////////
// Strongly-typed implementations
/// <summary>
/// IList.Add
/// </summary>
public void Add(TriggerAction value)
{
CheckSealed();
InheritanceContextHelper.ProvideContextForObject( _owner, value );
_rawList.Add(value);
}
/// <summary>
/// IList.Contains
/// </summary>
public bool Contains(TriggerAction value)
{
return _rawList.Contains(value);
}
/// <summary>
/// ICollection.CopyTo
/// </summary>
public void CopyTo( TriggerAction[] array, int index )
{
_rawList.CopyTo(array, index);
}
/// <summary>
/// IList.IndexOf
/// </summary>
public int IndexOf(TriggerAction value)
{
return _rawList.IndexOf(value);
}
/// <summary>
/// IList.Insert
/// </summary>
public void Insert(int index, TriggerAction value)
{
CheckSealed();
InheritanceContextHelper.ProvideContextForObject(_owner, value );
_rawList.Insert(index, value);
}
/// <summary>
/// IList.Remove
/// </summary>
public bool Remove(TriggerAction value)
{
CheckSealed();
InheritanceContextHelper.RemoveContextFromObject(_owner, value);
bool wasRemoved = _rawList.Remove(value);
return wasRemoved;
}
/// <summary>
/// IList.Item
/// </summary>
public TriggerAction this[int index]
{
get
{
return _rawList[index];
}
set
{
CheckSealed();
object oldValue = _rawList[index];
InheritanceContextHelper.RemoveContextFromObject(Owner, oldValue as DependencyObject);
_rawList[index] = value;
}
}
/// <summary>
/// IEnumerable.GetEnumerator
/// </summary>
[CLSCompliant(false)]
public IEnumerator<TriggerAction> GetEnumerator()
{
return _rawList.GetEnumerator();
}
///////////////////////////////////////////////////////////////////////
// Object-based implementations that can be removed once Parser
// has IList<T> support for strong typing.
int IList.Add(object value)
{
CheckSealed();
InheritanceContextHelper.ProvideContextForObject(_owner, value as DependencyObject);
int index = ((IList) _rawList).Add(VerifyIsTriggerAction(value));
return index;
}
bool IList.Contains(object value)
{
return _rawList.Contains(VerifyIsTriggerAction(value));
}
int IList.IndexOf(object value)
{
return _rawList.IndexOf(VerifyIsTriggerAction(value));
}
void IList.Insert(int index, object value)
{
Insert(index, VerifyIsTriggerAction(value));
}
bool IList.IsFixedSize
{
get
{
return _sealed;
}
}
void IList.Remove(object value)
{
Remove(VerifyIsTriggerAction(value));
}
object IList.this[int index]
{
get
{
return _rawList[index];
}
set
{
this[index] = VerifyIsTriggerAction(value);
}
}
void ICollection.CopyTo(Array array, int index)
{
((ICollection)_rawList).CopyTo(array, index);
}
object ICollection.SyncRoot
{
get
{
return this;
}
}
bool ICollection.IsSynchronized
{
get
{
return false;
}
}
IEnumerator IEnumerable.GetEnumerator()
{
return ((IEnumerable)_rawList).GetEnumerator();
}
///////////////////////////////////////////////////////////////////////
// Internal members
internal void Seal(TriggerBase containingTrigger )
{
for( int i = 0; i < _rawList.Count; i++ )
{
_rawList[i].Seal(containingTrigger);
}
}
// The event trigger that we're in
internal DependencyObject Owner
{
get { return _owner; }
set
{
Debug.Assert (Owner == null);
_owner = value;
}
}
///////////////////////////////////////////////////////////////////////
// Private members
// Throw if a change is attempted at a time we're not allowing them
private void CheckSealed()
{
if ( _sealed )
{
throw new InvalidOperationException(SR.Format(SR.CannotChangeAfterSealed, "TriggerActionCollection"));
}
}
// Throw if the given object isn't a TriggerAction
private TriggerAction VerifyIsTriggerAction(object value)
{
TriggerAction action = value as TriggerAction;
if ( action == null )
{
ArgumentNullException.ThrowIfNull(value);
throw new ArgumentException(SR.MustBeTriggerAction);
}
return action;
}
// The actual underlying storage for our TriggerActions
private List<TriggerAction> _rawList;
// Whether we are allowing further changes to the collection
private bool _sealed = false;
// The event trigger that we're in
private DependencyObject _owner = null;
}
}
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