using System;
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using UnityEngine;
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using UnityEngine.Events;
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namespace Core.Health
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{
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/// <summary>
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/// A UnityEvent that passes through the HealthChangeInfo
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/// </summary>
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[Serializable]
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public class HealthChangeEvent : UnityEvent<HealthChangeInfo>
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{
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}
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/// <summary>
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/// A UnityEvent that passes through the HitInfo
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/// </summary>
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[Serializable]
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public class HitEvent : UnityEvent<HitInfo>
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{
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}
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/// <summary>
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/// Damageable listener.
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/// </summary>
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public class DamageableListener : MonoBehaviour
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{
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// The damageable behaviour to listen to
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[Tooltip("Leave this empty if the DamageableBehaviour and DamageableListener are on the same component")]
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public DamageableBehaviour damageableBehaviour;
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// Events for health change (i.e. healing/damage) - to be configured in the editor
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public HealthChangeEvent damaged;
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public HealthChangeEvent healed;
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// Events for death and max health - to be configured in the editor
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public UnityEvent died;
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public UnityEvent reachedMaxHealth;
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// Event for when health is change
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public HealthChangeEvent healthChanged;
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// Event for hits
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[Header("The hit event is different from the damage event as it also contains hit position data")]
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public HitEvent hit;
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/// <summary>
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/// Lazy loads the DamageableBehaviour
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/// </summary>
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protected virtual void Awake()
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{
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LazyLoad();
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}
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/// <summary>
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/// Subscribes to events
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/// </summary>
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protected virtual void OnEnable()
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{
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damageableBehaviour.configuration.died += OnDeath;
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damageableBehaviour.configuration.reachedMaxHealth += OnReachedMaxHealth;
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damageableBehaviour.configuration.healed += OnHealed;
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damageableBehaviour.configuration.damaged += OnDamaged;
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damageableBehaviour.configuration.healthChanged += OnHealthChanged;
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damageableBehaviour.hit += OnHit;
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}
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/// <summary>
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/// Unsubscribes from events on disable
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/// </summary>
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protected virtual void OnDisable()
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{
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damageableBehaviour.configuration.died -= OnDeath;
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damageableBehaviour.configuration.reachedMaxHealth -= OnReachedMaxHealth;
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damageableBehaviour.configuration.healed -= OnHealed;
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damageableBehaviour.configuration.damaged -= OnDamaged;
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damageableBehaviour.configuration.healthChanged -= OnHealthChanged;
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damageableBehaviour.hit -= OnHit;
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}
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/// <summary>
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/// Raises the death UnityEvent.
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/// </summary>
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protected virtual void OnDeath(HealthChangeInfo info)
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{
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died.Invoke();
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}
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/// <summary>
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/// Raises the max health UnityEvent.
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/// </summary>
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protected virtual void OnReachedMaxHealth()
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{
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reachedMaxHealth.Invoke();
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}
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/// <summary>
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/// Raises the heal UnityEvent.
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/// </summary>
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/// <param name="info">Info.</param>
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protected virtual void OnHealed(HealthChangeInfo info)
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{
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healed.Invoke(info);
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}
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/// <summary>
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/// Raises the damage UnityEvent.
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/// </summary>
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/// <param name="info">Info.</param>
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protected virtual void OnDamaged(HealthChangeInfo info)
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{
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damaged.Invoke(info);
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}
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/// <summary>
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/// Raises the healthChanged UnityEvent.
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/// </summary>
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/// <param name="info">Info.</param>
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protected virtual void OnHealthChanged(HealthChangeInfo info)
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{
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healthChanged.Invoke(info);
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}
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/// <summary>
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/// Raises the hit UnityEvent.
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/// </summary>
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/// <param name="info">Info.</param>
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protected virtual void OnHit(HitInfo info)
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{
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hit.Invoke(info);
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}
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/// <summary>
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/// Looks for the damageableBehaviour if it is not already assigned
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/// It may be assigned in editor or from a previous LazyLoad() call
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/// </summary>
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protected void LazyLoad()
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{
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if (damageableBehaviour != null)
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{
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return;
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}
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damageableBehaviour = GetComponent<DamageableBehaviour>();
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}
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}
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}
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