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#region License
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/* FNA - XNA4 Reimplementation for Desktop Platforms
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* Copyright 2009-2020 Ethan Lee and the MonoGame Team
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*
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* Released under the Microsoft Public License.
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* See LICENSE for details.
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*/
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#endregion
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#region Using Statements
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using System;
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using System.Collections.ObjectModel;
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#endregion
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namespace Microsoft.Xna.Framework
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{
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public sealed class GameComponentCollection : Collection<IGameComponent>
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{
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#region Events
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/// <summary>
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/// Event that is triggered when a <see cref="GameComponent"/> is added
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/// to this <see cref="GameComponentCollection"/>.
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/// </summary>
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public event EventHandler<GameComponentCollectionEventArgs> ComponentAdded;
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/// <summary>
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/// Event that is triggered when a <see cref="GameComponent"/> is removed
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/// from this <see cref="GameComponentCollection"/>.
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/// </summary>
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public event EventHandler<GameComponentCollectionEventArgs> ComponentRemoved;
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#endregion
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#region Protected Methods
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/// <summary>
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/// Removes every <see cref="GameComponent"/> from this <see cref="GameComponentCollection"/>.
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/// Triggers <see cref="OnComponentRemoved"/> once for each <see cref="GameComponent"/> removed.
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/// </summary>
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protected override void ClearItems()
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{
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for (int i = 0; i < base.Count; i += 1)
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{
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this.OnComponentRemoved(new GameComponentCollectionEventArgs(base[i]));
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}
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base.ClearItems();
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}
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protected override void InsertItem(int index, IGameComponent item)
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{
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if (base.IndexOf(item) != -1)
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{
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throw new ArgumentException("Cannot Add Same Component Multiple Times");
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}
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base.InsertItem(index, item);
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if (item != null)
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{
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this.OnComponentAdded(new GameComponentCollectionEventArgs(item));
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}
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}
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protected override void RemoveItem(int index)
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{
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IGameComponent gameComponent = base[index];
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base.RemoveItem(index);
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if (gameComponent != null)
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{
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this.OnComponentRemoved(
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new GameComponentCollectionEventArgs(gameComponent)
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);
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}
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}
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protected override void SetItem(int index, IGameComponent item)
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{
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throw new NotSupportedException();
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}
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#endregion
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#region Private Methods
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private void OnComponentAdded(GameComponentCollectionEventArgs eventArgs)
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{
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if (this.ComponentAdded != null)
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{
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this.ComponentAdded(this, eventArgs);
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}
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}
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private void OnComponentRemoved(GameComponentCollectionEventArgs eventArgs)
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{
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if (this.ComponentRemoved != null)
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{
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this.ComponentRemoved(this, eventArgs);
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}
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}
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#endregion
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}
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}
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