Editor integration for SimpleAnimator

SimpleAnimatorEditor.cs

#if UNITY_EDITOR

using UnityEditor;
using UnityEngine;
using UnityEngine.UI;

namespace Tools {
    [CustomEditor(typeof(SimpleAnimator))] //find here: https://gist.github.com/R3tr0BoiDX/d84e91a03d020f2169d92446f1ffb857
    public sealed class SimpleAnimatorEditor : Editor {
        private SimpleAnimator anim;
        private bool animate;
        private Sprite baseSprite;
        private int currentSpriteIndex;
        private bool delay;
        private Image image;
        private float lastEditorUpdate;
        private float localTime;
        private SpriteRenderer rend;
        private float resetDelay;

        private void OnEnable() {
            EditorApplication.update += OnEditorUpdate;
        }

        private void OnDisable() {
            EditorApplication.update -= OnEditorUpdate;
        }

        public override void OnInspectorGUI() {
            base.OnInspectorGUI();

            anim = (SimpleAnimator)target;
            if (anim.UseGUIMode) {
                image = ((MonoBehaviour)target).gameObject.GetComponent<Image>();
            } else {
                rend = ((MonoBehaviour)target).gameObject.GetComponent<SpriteRenderer>();
            }

            Rect rect = EditorGUILayout.GetControlRect(false, 1);
            EditorGUI.DrawRect(rect, Color.grey);

            GUIContent content = new("Reset Delay", "Time until the animation resets");
            resetDelay = EditorGUILayout.FloatField(content, resetDelay, EditorStyles.numberField);

            if (GUILayout.Button("Animate")) {
                baseSprite = anim.UseGUIMode ? image.sprite : rend.sprite;

                animate = true;
            }
        }

        private void OnEditorUpdate() {
            float deltaTime = Time.realtimeSinceStartup - lastEditorUpdate;
            localTime += deltaTime;
            if (animate && localTime > anim.TimeBetweenFrames) {
                localTime = 0;
                SetSprite(anim.Frames[currentSpriteIndex]);
                currentSpriteIndex++;
                if (currentSpriteIndex >= anim.Frames.Length) {
                    currentSpriteIndex = 0;
                    delay = true;
                    animate = false;
                }
            } else if (delay) {
                if (localTime > resetDelay) {
                    SetSprite(baseSprite);
                    delay = false;
                }
            }

            lastEditorUpdate = Time.realtimeSinceStartup;
        }

        private void SetSprite(Sprite _sprite) {
            if (anim.UseGUIMode) {
                image.sprite = _sprite;
            } else {
                rend.sprite = _sprite;
            }
        }
    }
}

#endif