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using Netcode;
namespace StardewModdingAPI.Framework.StateTracking.FieldWatchers
{
/// <summary>A watcher which detects changes to a net value field.</summary>
internal class NetValueWatcher<T, TSelf> : BaseDisposableWatcher, IValueWatcher<T> where TSelf : NetFieldBase<T, TSelf>
{
/*********
** Properties
*********/
/// <summary>The field being watched.</summary>
private readonly NetFieldBase<T, TSelf> Field;
/*********
** Accessors
*********/
/// <summary>Whether the value changed since the last reset.</summary>
public bool IsChanged { get; private set; }
/// <summary>The field value at the last reset.</summary>
public T PreviousValue { get; private set; }
/// <summary>The latest value.</summary>
public T CurrentValue { get; private set; }
/*********
** Public methods
*********/
/// <summary>Construct an instance.</summary>
/// <param name="field">The field to watch.</param>
public NetValueWatcher(NetFieldBase<T, TSelf> field)
{
this.Field = field;
this.PreviousValue = field.Value;
this.CurrentValue = field.Value;
field.fieldChangeVisibleEvent += this.OnValueChanged;
field.fieldChangeEvent += this.OnValueChanged;
}
/// <summary>Update the current value if needed.</summary>
public void Update()
{
this.AssertNotDisposed();
}
/// <summary>Set the current value as the baseline.</summary>
public void Reset()
{
this.AssertNotDisposed();
this.PreviousValue = this.CurrentValue;
this.IsChanged = false;
}
/// <summary>Stop watching the field and release all references.</summary>
public override void Dispose()
{
if (!this.IsDisposed)
{
this.Field.fieldChangeEvent -= this.OnValueChanged;
this.Field.fieldChangeVisibleEvent -= this.OnValueChanged;
}
base.Dispose();
}
/*********
** Private methods
*********/
/// <summary>A callback invoked when the field's value changes.</summary>
/// <param name="field">The field being watched.</param>
/// <param name="oldValue">The old field value.</param>
/// <param name="newValue">The new field value.</param>
private void OnValueChanged(TSelf field, T oldValue, T newValue)
{
this.CurrentValue = newValue;
this.IsChanged = true;
}
}
}
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