64 lines
1.9 KiB
C#
64 lines
1.9 KiB
C#
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using System;
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using System.Collections;
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using System.Collections.Generic;
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using UnityEngine;
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namespace MoreMountains.Tools
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{
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/// <summary>
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/// This struct lets you declare observable properties.
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/// For example, let's say you have a class called Character, and you declare its speed like so :
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///
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/// public MMObservable<float> Speed;
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///
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/// then, in any other class, you can register to OnValueChanged events on that property (usually in OnEnable) :
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///
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/// protected virtual void OnEnable()
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/// {
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/// _myCharacter.Speed.OnValueChanged += OnSpeedChange;
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/// }
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///
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/// and unsubscribe like so :
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///
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/// protected virtual void OnDisable()
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/// {
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/// _myCharacter.Speed.OnValueChanged -= OnSpeedChange;
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/// }
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///
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/// and then all you need is a method to handle that speed change :
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///
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/// protected virtual void OnSpeedChange()
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/// {
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/// Debug.Log(_myCharacter.Speed.Value);
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/// }
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///
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/// You can look at the MMObservableTest demo scene for an example of how it's used.
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///
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/// </summary>
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/// <typeparam name="T"></typeparam>
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public struct MMObservable<T>
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{
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public Action OnValueChanged;
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public Action<T> OnValueChangedTo;
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public Action<T,T> OnValueChangedFromTo;
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private T _value;
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public T Value
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{
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get { return _value; }
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set
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{
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if (!EqualityComparer<T>.Default.Equals(value, _value))
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{
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var prev = _value;
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_value = value;
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OnValueChanged?.Invoke();
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OnValueChangedTo?.Invoke(_value);
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OnValueChangedFromTo?.Invoke(prev,_value);
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}
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}
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}
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}
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}
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