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/***************************************************************************\
*
* File: ConditionCollection.cs
*
* A collection of Condition-derived classes. See use in Style.cs and other
* places.
*
* Copyright (C) by Microsoft Corporation. All rights reserved.
*
\***************************************************************************/
using System.Collections.ObjectModel; // Collection<T>
using System.Diagnostics; // Debug.Assert
using System.Windows.Data; // Binding knowledge
using System.Windows.Media; // Visual knowledge
using System.Windows.Markup; // MarkupExtension
namespace System.Windows
{
/// <summary>
/// A collection of Condition objects to be used
/// in Template and its trigger classes
/// </summary>
public sealed class ConditionCollection : Collection<Condition>
{
#region ProtectedMethods
/// <summary>
/// ClearItems override
/// </summary>
protected override void ClearItems()
{
CheckSealed();
base.ClearItems();
}
/// <summary>
/// InsertItem override
/// </summary>
protected override void InsertItem(int index, Condition item)
{
CheckSealed();
ConditionValidation(item);
base.InsertItem(index, item);
}
/// <summary>
/// RemoveItem override
/// </summary>
protected override void RemoveItem(int index)
{
CheckSealed();
base.RemoveItem(index);
}
/// <summary>
/// SetItem override
/// </summary>
protected override void SetItem(int index, Condition item)
{
CheckSealed();
ConditionValidation(item);
base.SetItem(index, item);
}
#endregion ProtectedMethods
#region PublicMethods
/// <summary>
/// Returns the sealed state of this object. If true, any attempt
/// at modifying the state of this object will trigger an exception.
/// </summary>
public bool IsSealed
{
get
{
return _sealed;
}
}
#endregion PublicMethods
#region InternalMethods
internal void Seal(ValueLookupType type)
{
_sealed = true;
// Seal all the conditions
for (int i=0; i<Count; i++)
{
this[i].Seal(type);
}
}
#endregion InternalMethods
#region PrivateMethods
private void CheckSealed()
{
if (_sealed)
{
throw new InvalidOperationException(SR.Get(SRID.CannotChangeAfterSealed, "ConditionCollection"));
}
}
private void ConditionValidation(object value)
{
if (value == null)
{
throw new ArgumentNullException("value");
}
Condition condition = value as Condition;
if (condition == null)
{
throw new ArgumentException(SR.Get(SRID.MustBeCondition));
}
}
#endregion PrivateMethods
#region Data
private bool _sealed;
#endregion Data
}
}
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