Unity Editor: Custom Editor Base

using System;
using UnityEditor;
using UnityEngine;

namespace JasonStorey
{
    public abstract class CustomEditor<T> : Editor where T : Component
    {
        protected T Item;

        protected virtual void OnEnable()
        {
            Item = (T) target;
        }

        protected abstract void Draw();

        public override void OnInspectorGUI()
        {
            serializedObject.Update();
            Draw();
            serializedObject.ApplyModifiedProperties();
        }

        protected void SelectInScene(Transform camTransform)
        {
            SceneView sceneCamera = SceneView.lastActiveSceneView;
            sceneCamera.LookAt(camTransform.position);
        }

        protected void EndColor() => Color = _oldColor;

        private Color _oldColor;

        protected void StartColor(Color col)
        {
            _oldColor = Color;
            Color = col;
        }



        protected void DrawFixableDependency(Func<T,bool> item,string field,string message,Action fix)
        {
            Space();
            if (item.Invoke(Item))
            {
                Field(field);
                Info(message,JSEditorColors.Warning);
                Color = JSEditorColors.GoBtn;
                if (Btn("Fix")) fix?.Invoke();
                Color = JSEditorColors.Editor;
            }
            else
            {
                Field(field);
            }
        }

        protected void TabPages(int index, params Action[] drawFunctions)
        {
            if (index > -1 && index < drawFunctions.Length)
                drawFunctions[index].Invoke();
        }

        protected Vector2 BeginScroll(Vector2 scroll,float min = 50,float max = 200) => EditorGUILayout.BeginScrollView(scroll, GUILayout.MaxHeight(max), GUILayout.MinHeight(max));
        protected void EndScroll() => EditorGUILayout.EndScrollView();


        protected void SelectInInspector(Component component) => Selection.activeObject = component;
        protected void PingInInspector(Component component) => EditorGUIUtility.PingObject(component);

        protected int TabHeaders(int tab,params string[] tabNames)=>GUILayout.Toolbar (tab, tabNames);

        protected void StartRow() => EditorGUILayout.BeginHorizontal();
        protected void EndRow() => EditorGUILayout.EndHorizontal();
        protected void StartColumn() => EditorGUILayout.BeginVertical();
        protected void EndColumn() => EditorGUILayout.EndVertical();

        protected bool Ask(string title, string message, string yes, string no) =>
            EditorUtility.DisplayDialog(title, message, yes, no);

        protected bool AskToDelete(string thing,string message) => Ask($"Delete {thing}", message, $"Yes. Delete {thing}", "No. Do Nothing");


        protected void MaxEditorSize(float size) => EditorGUILayout.BeginVertical(GUILayout.MinHeight(size));

        protected void SetSize(float size) => EditorGUILayout.BeginVertical(GUILayout.Height(size));
        void EndSize() => EditorGUILayout.EndVertical();
        protected void EndSetSize() => EditorGUILayout.EndVertical();

        protected void Info(string message) => EditorGUILayout.HelpBox(message, MessageType.None);

        protected void Info(string message,Color col)
        {
            var c = Color;
            Color = col;
            EditorGUILayout.HelpBox(message, MessageType.None);
            Color = c;
        }

        protected void StartBox(string style = BOXSTYLE_GROUP, params GUILayoutOption[] options) => EditorGUILayout.BeginVertical(style,options);
        protected void EndBox() => EditorGUILayout.EndVertical();

        protected Color Color
        {
            get => GUI.color;
            set => GUI.color = value;
        }

        protected bool BtnSmall(string lbl,float size) => GUILayout.Button(lbl, GUILayout.MaxWidth(size));
        protected bool Btn(string lbl) => GUILayout.Button(lbl);
        protected bool Btn(string lbl,string tooltip) => GUILayout.Button(new GUIContent(lbl,tooltip));

        protected bool Btn(string lbl, params GUILayoutOption[] options) => Btn(new GUIContent(lbl), options);
        protected bool Btn(GUIContent content,params GUILayoutOption[] options) => GUILayout.Button(content,options);
        protected void Lbl(string lbl,params GUILayoutOption[] options) => EditorGUILayout.LabelField(lbl,options);

        protected void Lbl(string lbl, string tooltip, params GUILayoutOption[] options) =>
            EditorGUILayout.LabelField(new GUIContent(lbl, tooltip), options);

        protected void Header(string lbl) => EditorGUILayout.LabelField(lbl, EditorStyles.boldLabel);

        protected bool IsEditor => !Application.isPlaying;

        protected void Space() => EditorGUILayout.Space();
        protected void Field(string fld) => EditorGUILayout.PropertyField(serializedObject.FindProperty(fld));

        protected const string BOXSTYLE_HELP = "HelpBox";
        protected const string BOXSTYLE_GROUP = "GroupBox";

    }
}