net.peeweek.gameplay-ingredients/Editor/WelcomeScreen/WelcomeScreen.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEditor;

namespace GameplayIngredients.Editor
{
    partial class WelcomeScreen : EditorWindow
    {
        const string kShowOnStartupPreference = "GameplayIngredients.Welcome.ShowAtStartup";
        const int WindowWidth = 640;
        const int WindowHeight = 520;

        static bool showOnStartup
        {
            get { return EditorPrefs.GetBool(kShowOnStartupPreference, true); }
            set { if (value != showOnStartup) EditorPrefs.SetBool(kShowOnStartupPreference, value); }
        }

        static readonly Texture2D header = (Texture2D)EditorGUIUtility.Load("Packages/net.peeweek.gameplay-ingredients/Editor/WelcomeScreen/welcome-title.png");

        [InitializeOnLoadMethod]
        static void InitShowAtStartup()
        {
            if (showOnStartup)
                EditorApplication.update += ShowAtStartup;

        }

        static void ShowAtStartup()
        {
            if (!Application.isPlaying)
            {
                ShowFromMenu();
            }
            EditorApplication.update -= ShowAtStartup;
        }

        [MenuItem("Window/Gameplay Ingredients")]
        static void ShowFromMenu()
        {
            GetWindow<WelcomeScreen>(true, "Gameplay Ingredients");
        }

        private void OnEnable()
        {
            this.position = new Rect((Screen.width / 2.0f) - WindowWidth / 2, (Screen.height / 2.0f) - WindowHeight / 2, WindowWidth, WindowHeight);
            this.minSize = new Vector2(WindowWidth, WindowHeight);
            this.maxSize = new Vector2(WindowWidth, WindowHeight);

            if (!GameplayIngredientsSettings.hasSettingAsset)
                wizardMode = WizardMode.FirstTimeSetup;

            InitTips();
        }

        private void OnDestroy()
        {
            EditorApplication.update -= ShowAtStartup;
        }

        private enum WizardMode
        {
            TipOfTheDay = 0,
            FirstTimeSetup = 1,
            About = 2,
        }

        [SerializeField]
        private WizardMode wizardMode = WizardMode.TipOfTheDay;

        private void OnGUI()
        {
            Rect headerRect = GUILayoutUtility.GetRect(640, 215);
            GUI.DrawTexture(headerRect, header);
            RectOffset headerButtonsOffset = new RectOffset(200, 200, 160, 16);
            using (new GUILayout.AreaScope(new Rect(160, 180, 320, 32)))
            {
                using (new GUILayout.HorizontalScope())
                {
                    GUILayout.FlexibleSpace();
                    bool value = false;

                    value = wizardMode == WizardMode.TipOfTheDay;
                    value = GUILayout.Toggle(value, "  Tips  ", Styles.buttonLeft); 
                    if(value)
                        wizardMode = WizardMode.TipOfTheDay;

                    value = wizardMode == WizardMode.FirstTimeSetup;
                    value = GUILayout.Toggle(value, "  Setup  ", Styles.buttonMid);
                    if (value)
                        wizardMode = WizardMode.FirstTimeSetup;

                    value = wizardMode == WizardMode.About;
                    value = GUILayout.Toggle(value, "  About  ", Styles.buttonRight);
                    if(value)
                        wizardMode = WizardMode.About;

                    GUILayout.FlexibleSpace();
                }
            }
            GUILayout.Space(8);

            switch (wizardMode)
            {
                case WizardMode.TipOfTheDay:
                    OnTipsGUI();
                    break;
                case WizardMode.FirstTimeSetup:
                    OnSetupGUI();
                    break;
                case WizardMode.About:
                    OnAboutGUI();
                    break;
            }

            Rect line = GUILayoutUtility.GetRect(640, 1);
            EditorGUI.DrawRect(line, Color.black);
            using (new GUILayout.HorizontalScope())
            {
                showOnStartup = GUILayout.Toggle(showOnStartup, " Show this window on startup");
                GUILayout.FlexibleSpace();
                if (GUILayout.Button("Close"))
                {
                    this.Close();
                }
            }
        }

        void OnAboutGUI()
        {
            GUILayout.Label("About", EditorStyles.boldLabel);

            using (new GUILayout.VerticalScope(Styles.helpBox))
            {

                GUILayout.Label("Gameplay Ingredients", Styles.centeredTitle);
                GUILayout.Label(@"(and cooking ustensils)

A set of Open Source Runtime and Editor Tools for your Unity prototypes and games. These scripts are maintained by Thomas Iche and released under MIT License as a unity package. 

<b>This package also makes use of the following third party components:</b>
- <i>Naughty Attributes</i> by Denis Rizov (https://github.com/dbrizov) 
- <i>Fugue Icons</i> by Yusuke Kamiyamane (https://p.yusukekamiyamane.com/).
- <i>Header art background 'Chef's Station'</i> by Todd Quackenbush (https://unsplash.com/photos/x5SRhkFajrA).
", Styles.centeredBody);

                using (new GUILayout.HorizontalScope())
                {
                    GUILayout.FlexibleSpace();
                    if (GUILayout.Button("  Github Page  ", Styles.buttonLeft))
                        Application.OpenURL("https://github.com/peeweek/net.peeweek.gameplay-ingredients");
                    if (GUILayout.Button("  Report a Bug  ", Styles.buttonMid))
                        Application.OpenURL("https://github.com/peeweek/net.peeweek.gameplay-ingredients/issues");
                    if (GUILayout.Button("  LICENSE  ", Styles.buttonRight))
                        Application.OpenURL("https://github.com/peeweek/net.peeweek.gameplay-ingredients/blob/master/LICENSE");

                    GUILayout.FlexibleSpace();
                }

                GUILayout.FlexibleSpace();
            }
        }
    }

    static class Styles
    {
        public static GUIStyle buttonLeft;
        public static GUIStyle buttonMid;
        public static GUIStyle buttonRight;
        public static GUIStyle title;
        public static GUIStyle body;

        public static GUIStyle centeredTitle;
        public static GUIStyle centeredBody;
        public static GUIStyle helpBox;

        static Styles()
        {
            buttonLeft = new GUIStyle(EditorStyles.miniButtonLeft);
            buttonMid = new GUIStyle(EditorStyles.miniButtonMid);
            buttonRight = new GUIStyle(EditorStyles.miniButtonRight);
            buttonLeft.fontSize = 12;
            buttonMid.fontSize = 12;
            buttonRight.fontSize = 12;

            title = new GUIStyle(EditorStyles.label);    
            title.fontSize = 22;

            centeredTitle = new GUIStyle(title);
            centeredTitle.alignment = TextAnchor.UpperCenter;

            body = new GUIStyle(EditorStyles.label);
            body.fontSize = 12;
            body.wordWrap = true;
            body.richText = true;

            centeredBody = new GUIStyle(body);
            centeredBody.alignment = TextAnchor.UpperCenter;

            helpBox = new GUIStyle(EditorStyles.helpBox);
            helpBox.padding = new RectOffset(12,12,12,12);
        }
    }
}