Added static event example to Observer

Author: Habrador

Assets/Patterns/3. Observer/Different events/DifferentEvents.cs renamed to Assets/Patterns/3. Observer/Different events/DifferentEventAlternatives.cs

@@ -7,7 +7,7 @@
 namespace Observer.DifferentEvents
 {
     //A summary of all different events alternatives
-    public class DifferentEvents : MonoBehaviour
+    public class DifferentEventAlternatives : MonoBehaviour
     {
         //
         // Built-in event handling 

Assets/Patterns/3. Observer/Different events/DifferentEvents.cs.meta renamed to Assets/Patterns/3. Observer/Different events/DifferentEventAlternatives.cs.meta

@@ -0,0 +1,106 @@
+%YAML 1.1
+%TAG !u! tag:unity3d.com,2011:
+--- !u!1 &3795548911032069199
+GameObject:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  serializedVersion: 6
+  m_Component:
+  - component: {fileID: 5170567254207206714}
+  - component: {fileID: 958802086957748505}
+  - component: {fileID: 4635099428496446250}
+  - component: {fileID: 2981133933446519919}
+  - component: {fileID: 6019547679234711328}
+  m_Layer: 0
+  m_Name: Enemy
+  m_TagString: Untagged
+  m_Icon: {fileID: 0}
+  m_NavMeshLayer: 0
+  m_StaticEditorFlags: 0
+  m_IsActive: 1
+--- !u!4 &5170567254207206714
+Transform:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_GameObject: {fileID: 3795548911032069199}
+  m_LocalRotation: {x: 0, y: 0, z: 0, w: 1}
+  m_LocalPosition: {x: 0, y: 0, z: 0}
+  m_LocalScale: {x: 1, y: 1, z: 1}
+  m_Children: []
+  m_Father: {fileID: 0}
+  m_RootOrder: 0
+  m_LocalEulerAnglesHint: {x: 0, y: 0, z: 0}
+--- !u!33 &958802086957748505
+MeshFilter:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_GameObject: {fileID: 3795548911032069199}
+  m_Mesh: {fileID: 10202, guid: 0000000000000000e000000000000000, type: 0}
+--- !u!23 &4635099428496446250
+MeshRenderer:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_GameObject: {fileID: 3795548911032069199}
+  m_Enabled: 1
+  m_CastShadows: 1
+  m_ReceiveShadows: 1
+  m_DynamicOccludee: 1
+  m_MotionVectors: 1
+  m_LightProbeUsage: 1
+  m_ReflectionProbeUsage: 1
+  m_RenderingLayerMask: 1
+  m_RendererPriority: 0
+  m_Materials:
+  - {fileID: 10303, guid: 0000000000000000f000000000000000, type: 0}
+  m_StaticBatchInfo:
+    firstSubMesh: 0
+    subMeshCount: 0
+  m_StaticBatchRoot: {fileID: 0}
+  m_ProbeAnchor: {fileID: 0}
+  m_LightProbeVolumeOverride: {fileID: 0}
+  m_ScaleInLightmap: 1
+  m_PreserveUVs: 0
+  m_IgnoreNormalsForChartDetection: 0
+  m_ImportantGI: 0
+  m_StitchLightmapSeams: 0
+  m_SelectedEditorRenderState: 3
+  m_MinimumChartSize: 4
+  m_AutoUVMaxDistance: 0.5
+  m_AutoUVMaxAngle: 89
+  m_LightmapParameters: {fileID: 0}
+  m_SortingLayerID: 0
+  m_SortingLayer: 0
+  m_SortingOrder: 0
+--- !u!65 &2981133933446519919
+BoxCollider:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_GameObject: {fileID: 3795548911032069199}
+  m_Material: {fileID: 0}
+  m_IsTrigger: 0
+  m_Enabled: 1
+  serializedVersion: 2
+  m_Size: {x: 1, y: 1, z: 1}
+  m_Center: {x: 0, y: 0, z: 0}
+--- !u!114 &6019547679234711328
+MonoBehaviour:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_GameObject: {fileID: 3795548911032069199}
+  m_Enabled: 1
+  m_EditorHideFlags: 0
+  m_Script: {fileID: 11500000, guid: 1f3193e44b9e9474c9ce8a40cc272d0a, type: 3}
+  m_Name: 
+  m_EditorClassIdentifier: 

Assets/Patterns/3. Observer/Static events.meta

@@ -0,0 +1,41 @@
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+namespace Observer.StaticEvents
+{
+    public class Enemy : MonoBehaviour
+    {
+        //Because this is static we only need to subscribe to this event once
+        public static event Action<Enemy> onAnyEnemyDie;
+        //What the enemy is worth
+        public int enemyValue { get; private set; }
+
+
+        void Start()
+        {
+
+        }
+
+
+        void Update()
+        {
+
+        }
+
+
+        private void OnDisable()
+        {
+            enemyValue = UnityEngine.Random.Range(0, 5);
+
+            //Debug.Log(enemyValue);
+
+            //Invoke the event and to each method that subscribes to the event we will send a reference to this object
+            onAnyEnemyDie?.Invoke(this);
+
+            //This is also working, but is less clear
+            //onAnyEnemyDie(this);
+        }
+    }
+}

Assets/Patterns/3. Observer/Static events/Enemy.prefab

@@ -0,0 +1,50 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+namespace Observer.StaticEvents
+{
+    //Will illustrate static events
+    //Basic idea is that when an enemy dies, we add to the score
+    public class StaticEventsController : MonoBehaviour
+    {
+        public Enemy enemyPrefab;
+
+        private int score;
+
+        private int enemiesKilled = 0;
+
+
+        void Awake()
+        {
+            //Subscribe to the event that's happening each time an enemy dies
+            //Multiple things may happen when an enemy dies, so better to have the event in the enemy class!
+            //Because this is a static event we only need to subscribe once and not to each enemy instance
+            Enemy.onAnyEnemyDie += AddToScore;
+        }
+
+
+        void Update()
+        {
+            //Spawn new enemies that will die after some time
+            if (Input.GetKeyDown(KeyCode.Space))
+            {
+                GameObject newEnemy = Instantiate(enemyPrefab.gameObject, Random.insideUnitSphere, Quaternion.identity) as GameObject;
+
+                //Kill the enemy automatically after 3 seconds which will trigger the event
+                Destroy(newEnemy, 3f);
+            }
+        }
+
+
+        //This method subscribes to the event
+        void AddToScore(Enemy enemyScript)
+        {
+            score += enemyScript.enemyValue;
+
+            enemiesKilled += 1;
+
+            Debug.Log($"You've killed {enemiesKilled} enemies and the score is: {score}");
+        }
+    }
+}