Unity Editor: Camera System Editor

using JasonStorey.Cameras;
using UnityEditor;
using UnityEngine;

namespace JasonStorey
{
    [CustomEditor(typeof(CameraSystem))]
    public class CameraSystemEditor : CustomCameraSystemEditor<CameraSystem>
    {
        private void DrawAbout() => DrawAbout(nameof(CameraSystem),
            "Camera System is the main controller of cameras. It sets a camera active, and uses a camera lookup to " +
            "allow controls like 'GotoNext' etc");

        protected override void Draw()
        {
            _index = TabHeaders(_index, "Main", "Controls", "Cams","Events", "About");
            TabPages(_index,DrawMain,DrawControls,DrawCameras,DrawEvents,DrawAbout);
        }

        private void DrawCameras() =>_scroll = DrawCameraScroller("Cameras", ref _scroll,ref ColCount, Item.All);

        public void DrawEvents() => DrawEvents("CameraChanged");

        private void DrawControls()
        {
            StartBox();
            StartRow();
            for (int i = 0; i < 9; i++)
            {
                if(Btn($"{i+1}")) Item.GotoIndex(i);
            }
            EndRow();
            Space();
            StartRow();
            if(BtnSmall("First",SMALL_BUTTON_SIZE)) Item.GotoFirst();
            if(BtnSmall("Prev",SMALL_BUTTON_SIZE)) Item.GotoPrev();
            if(BtnSmall("Random",SMALL_BUTTON_SIZE)) Item.GotoRandom();
            if(BtnSmall("Next",SMALL_BUTTON_SIZE)) Item.GotoNext();
            if(BtnSmall("Last",SMALL_BUTTON_SIZE)) Item.GotoLast();
            EndRow();


            EndBox();
        }

        private void DrawMain()
        {
            StartBox();

            DrawFixableDependency(x=>x.Lookup ==null,"Lookup","Camera system requires a CameraLookup reference to see the cameras.",TryAddLookup);
            Field("ChangeWithSet");
            EndBox();

            if (Application.isPlaying)
                DrawCurrentCamera();

        }

        private void DrawCurrentCamera()
        {
            StartBox();
            if (Item.Current == null)
            {
                Lbl("No Current Camera");
            }
            else
            {
                DrawCameraTool(Item.Current);
            }
            EndBox();
        }

        private void DrawCameraTool(SmartCamera cam)
        {
            var content = new GUIContent(cam.Name);
            Header(content.text);

          DrawCamera(cam);


          StartRow();
          var c =  SceneViewFollow ? new Color(0.53f, 1f, 0.7f) : new Color(1f, 0.5f, 0.5f);
          StartColor(c);
          EditorGUILayout.Toggle(SceneViewFollow,GUILayout.Width(20));
          EndColor();
          if(Btn(SceneViewFollow ? "Stop Following" : "Follow Current Camera in Scene"))
          {
              SceneViewFollow = !SceneViewFollow;

          }



          EndRow();

          if(SceneViewFollow) SelectInScene(cam.transform);

        }


        private bool SceneViewFollow;

        private void TryAddLookup()
        {
            var lu = Item.GetComponent<CameraLookup>();
            Item.Lookup = lu != null ? lu : Item.gameObject.AddComponent<CameraLookup>();

        }

        protected override void DrawCamera(SmartCamera cam)
        {
            Color = new Color(0,0,0,0.1f);
            StartBox();
            StartRow();
            Color = new Color(1,1,0,0.8f);
            if (Btn(new GUIContent("?", "Where is this object?"), GUILayout.MaxWidth(120)))
            {
                PingInInspector(cam);
                SelectInScene(cam.transform);
            }
            Color = cam.IsLive ? JSEditorColors.GoBtn : Color.white;
            if (Btn(new GUIContent(cam.Name,"Activate this Camera"))) Item.SetCamera(cam);
            Color = new Color(1f, 0.55f, 0.35f, 0.8f);
            if (Btn(new GUIContent("goto","Select this object in the inspector"),GUILayout.MaxWidth(40))) SelectInInspector(cam);
            EndRow();
            EndBox();
            Color = Color.white;
        }

        private int _index;
        private const float SMALL_BUTTON_SIZE = 60;
        private int ColCount = 2;
        private Vector2 _scroll;
    }
}