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using System.Collections.Generic;
using Netcode;
namespace StardewModdingAPI.Framework.StateTracking.FieldWatchers
{
/// <summary>A watcher which detects changes to a net list field.</summary>
/// <typeparam name="TValue">The list value type.</typeparam>
internal class NetListWatcher<TValue> : BaseDisposableWatcher, ICollectionWatcher<TValue>
where TValue : class, INetObject<INetSerializable>
{
/*********
** Fields
*********/
/// <summary>The field being watched.</summary>
private readonly NetList<TValue, NetRef<TValue>> Field;
/// <summary>The pairs added since the last reset.</summary>
private readonly IList<TValue> AddedImpl = new List<TValue>();
/// <summary>The pairs removed since the last reset.</summary>
private readonly IList<TValue> RemovedImpl = new List<TValue>();
/*********
** Accessors
*********/
/// <summary>Whether the collection changed since the last reset.</summary>
public bool IsChanged => this.AddedImpl.Count > 0 || this.RemovedImpl.Count > 0;
/// <summary>The values added since the last reset.</summary>
public IEnumerable<TValue> Added => this.AddedImpl;
/// <summary>The values removed since the last reset.</summary>
public IEnumerable<TValue> Removed => this.RemovedImpl;
/*********
** Public methods
*********/
/// <summary>Construct an instance.</summary>
/// <param name="field">The field to watch.</param>
public NetListWatcher(NetList<TValue, NetRef<TValue>> field)
{
this.Field = field;
field.OnElementChanged += this.OnElementChanged;
field.OnArrayReplaced += this.OnArrayReplaced;
}
/// <summary>Set the current value as the baseline.</summary>
public void Reset()
{
this.AddedImpl.Clear();
this.RemovedImpl.Clear();
}
/// <summary>Update the current value if needed.</summary>
public void Update()
{
this.AssertNotDisposed();
}
/// <summary>Stop watching the field and release all references.</summary>
public override void Dispose()
{
if (!this.IsDisposed)
{
this.Field.OnElementChanged -= this.OnElementChanged;
this.Field.OnArrayReplaced -= this.OnArrayReplaced;
}
base.Dispose();
}
/*********
** Private methods
*********/
/// <summary>A callback invoked when the value list is replaced.</summary>
/// <param name="list">The net field whose values changed.</param>
/// <param name="oldValues">The previous list of values.</param>
/// <param name="newValues">The new list of values.</param>
private void OnArrayReplaced(NetList<TValue, NetRef<TValue>> list, IList<TValue> oldValues, IList<TValue> newValues)
{
this.AddedImpl.Clear();
this.RemovedImpl.Clear();
foreach (TValue value in newValues)
this.AddedImpl.Add(value);
foreach (TValue value in oldValues)
this.RemovedImpl.Add(value);
}
/// <summary>A callback invoked when an entry is replaced.</summary>
/// <param name="list">The net field whose values changed.</param>
/// <param name="index">The list index which changed.</param>
/// <param name="oldValue">The previous value.</param>
/// <param name="newValue">The new value.</param>
private void OnElementChanged(NetList<TValue, NetRef<TValue>> list, int index, TValue oldValue, TValue newValue)
{
if (newValue != null)
this.AddedImpl.Add(newValue);
if (oldValue != null)
this.RemovedImpl.Add(oldValue);
}
}
}
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