#region License
#endregion
#region Using Statements
using System;
using System.Collections.ObjectModel;
#endregion
namespace Microsoft.Xna.Framework
{
public sealed class GameComponentCollection : Collection<IGameComponent>
{
#region Events
/// <summary>
/// Event that is triggered when a <see cref="GameComponent"/> is added
/// to this <see cref="GameComponentCollection"/>.
/// </summary>
public event EventHandler<GameComponentCollectionEventArgs> ComponentAdded;
/// <summary>
/// Event that is triggered when a <see cref="GameComponent"/> is removed
/// from this <see cref="GameComponentCollection"/>.
/// </summary>
public event EventHandler<GameComponentCollectionEventArgs> ComponentRemoved;
#endregion
#region Protected Methods
/// <summary>
/// Removes every <see cref="GameComponent"/> from this <see cref="GameComponentCollection"/>.
/// Triggers <see cref="OnComponentRemoved"/> once for each <see cref="GameComponent"/> removed.
/// </summary>
protected override void ClearItems()
{
for (int i = 0; i < base.Count; i += 1)
{
this.OnComponentRemoved(new GameComponentCollectionEventArgs(base[i]));
}
base.ClearItems();
}
protected override void InsertItem(int index, IGameComponent item)
{
if (base.IndexOf(item) != -1)
{
throw new ArgumentException("Cannot Add Same Component Multiple Times");
}
base.InsertItem(index, item);
if (item != null)
{
this.OnComponentAdded(new GameComponentCollectionEventArgs(item));
}
}
protected override void RemoveItem(int index)
{
IGameComponent gameComponent = base[index];
base.RemoveItem(index);
if (gameComponent != null)
{
this.OnComponentRemoved(
new GameComponentCollectionEventArgs(gameComponent)
);
}
}
protected override void SetItem(int index, IGameComponent item)
{
throw new NotSupportedException();
}
#endregion
#region Private Methods
private void OnComponentAdded(GameComponentCollectionEventArgs eventArgs)
{
if (this.ComponentAdded != null)
{
this.ComponentAdded(this, eventArgs);
}
}
private void OnComponentRemoved(GameComponentCollectionEventArgs eventArgs)
{
if (this.ComponentRemoved != null)
{
this.ComponentRemoved(this, eventArgs);
}
}
#endregion
}
}
