Add editor script

Assets/Coffee/UIExtentions/UIParticle/Editor.meta

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Assets/Coffee/UIExtentions/UIParticle/Editor/UIParticleEditor.cs

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+using UnityEditor;
+using UnityEditor.UI;
+using UnityEngine;
+
+namespace Coffee.UIExtensions
+{
+	[CustomEditor(typeof(UIParticle))]
+	[CanEditMultipleObjects]
+	public class UIParticleEditor : GraphicEditor
+	{
+		//################################
+		// Constant or Static Members.
+		//################################
+		static readonly GUIContent contentParticleMaterial = new GUIContent("Particle Material", "The material for rendering particles");
+		static readonly GUIContent contentTrailMaterial = new GUIContent("Trail Material", "The material for rendering particle trails");
+
+
+		//################################
+		// Public/Protected Members.
+		//################################
+		/// <summary>
+		/// This function is called when the object becomes enabled and active.
+		/// </summary>
+		protected override void OnEnable()
+		{
+			base.OnEnable();
+			_spParticleSystem = serializedObject.FindProperty("m_ParticleSystem");
+			_spTrailParticle = serializedObject.FindProperty("m_TrailParticle");
+		}
+
+		/// <summary>
+		/// Implement this function to make a custom inspector.
+		/// </summary>
+		public override void OnInspectorGUI()
+		{
+			serializedObject.Update();
+
+			EditorGUILayout.PropertyField(_spParticleSystem);
+			EditorGUI.indentLevel++;
+			var ps = _spParticleSystem.objectReferenceValue as ParticleSystem;
+			if (ps)
+			{
+				var pr = ps.GetComponent<ParticleSystemRenderer>();
+				var sp = new SerializedObject(pr).FindProperty("m_Materials");
+
+				EditorGUILayout.PropertyField(sp.GetArrayElementAtIndex(0), contentParticleMaterial);
+				EditorGUILayout.PropertyField(sp.GetArrayElementAtIndex(1), contentTrailMaterial);
+				sp.serializedObject.ApplyModifiedProperties();
+
+				if(!Application.isPlaying && pr.enabled)
+				{
+					EditorGUILayout.HelpBox("ParticleSystemRenderer will be disable on playing.", MessageType.Info);
+				}
+			}
+			EditorGUI.indentLevel--;
+
+			EditorGUI.BeginDisabledGroup(true);
+			EditorGUILayout.PropertyField(_spTrailParticle);
+			EditorGUI.EndDisabledGroup();
+
+			serializedObject.ApplyModifiedProperties();
+		}
+
+		//################################
+		// Private Members.
+		//################################
+		SerializedProperty _spParticleSystem;
+		SerializedProperty _spTrailParticle;
+	}
+}

Assets/Coffee/UIExtentions/UIParticle/Editor/UIParticleEditor.cs.meta

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