Custom Unity PreferencesWindow

PreferencesWindow.cs

using UnityEngine;
using UnityEditor;

public class PreferencesWindow : EditorWindow
{
	private const string WINDOW_NAME = "Preferences"; //Text displayed for the menu and window name
	private const string SHORTCUT = CTRL + Shift + "W"; //Shortcut to open the window. Shortcut = Ctrl+Shift+W
	private const string MENU_LOCATION = "Window/" + WINDOW_NAME + " " + SHORTCUT; //Location and name of menu item

	private Vector2 scrollPos = Vector2.zero;
	private System.Collections.Generic.List<ITab> tabs = new System.Collections.Generic.List<ITab>();

	private int _selectedIndex = 0;
	private int SelectedIndex
	{
		get
		{
			return this._selectedIndex;
		}
		set
		{
			this._selectedIndex = value;
			if(this._selectedIndex >= tabs.Count)
			{
				this._selectedIndex = 0;
			}
			else
			{
				if(this._selectedIndex >= 0)
					return;
				this._selectedIndex = tabs.Count - 1;
			}
		}
	}

	private ITab SelectedTab
	{
		get
		{
			return tabs[_selectedIndex];
		}
	}

	[MenuItem(MENU_LOCATION)]
	public static void Init()
	{
		//Init window
		EditorWindow window = EditorWindow.GetWindow<RPGWindow>(true, WINDOW_NAME, true);
		window.minSize = new Vector2(750, 400);
		window.position = new Rect(new Vector2(200, 200), window.minSize);
	}

	public void OnEnable()
	{
		//Add tabs
		tabs.Add(new TabOne());
		tabs.Add(new TabTwo());
	}

	public void OnGUI()
	{
		//Styles
		GUIStyle sectionScrollView = (GUIStyle)"PreferencesSectionBox";
		GUIStyle sectionElement = (GUIStyle)"PreferencesSection";
		GUIStyle selected = (GUIStyle) "ServerUpdateChangesetOn";
		GUIStyle sectionHeader = new GUIStyle(EditorStyles.largeLabel);
		sectionHeader.fontStyle = FontStyle.Bold;
		sectionHeader.fontSize = 18;
		sectionHeader.margin.top = 10;
		++sectionHeader.margin.left;
		sectionHeader.normal.textColor = EditorGUIUtility.isProSkin ? new Color(0.7f, 0.7f, 0.7f, 1f) : new Color(0.4f, 0.4f, 0.4f, 1f);

		EditorGUIUtility.labelWidth = 200;
		HandleKeyControl(); //Keyboard navigation (Up/Down)

		GUILayout.BeginHorizontal();
		{
			//Sidebar
			scrollPos = GUILayout.BeginScrollView(scrollPos, sectionScrollView, GUILayout.Width(120f));
			{
				GUILayout.Space(40); //Offset buttons
				for(int i = 0; i < tabs.Count; i++) //Display each tab button
				{
					ITab tab = tabs[i];
					bool isActive = i == SelectedIndex;

					Rect rect = GUILayoutUtility.GetRect(tab.Title, sectionElement, GUILayout.ExpandWidth(true));

					//Selection highlight
					if(isActive && Event.current.type == EventType.Repaint)
						selected.Draw(rect, false, false, false, false);

					//Button
					EditorGUI.BeginChangeCheck();
					{
						if(GUI.Toggle(rect, isActive, tab.Title, sectionElement))
							SelectedIndex = i;
					}
					if(EditorGUI.EndChangeCheck()) GUIUtility.keyboardControl = 0;
					//GUILayout.Space(1); //If you want a little extra space
				}
			}
			GUILayout.EndScrollView();

			//Content
			GUILayout.Space(10);
			{
				GUILayout.BeginVertical();
				{
					GUILayout.Label(SelectedTab.Title, sectionHeader); //Header text

					//Draw tab's content
					GUILayout.Space(10);
					{
						SelectedTab.OnGUI();
					}
					GUILayout.Space(5);
				}
				GUILayout.EndVertical();
			}
			GUILayout.Space(10);
		}
		GUILayout.EndHorizontal();
	}

	private void HandleKeyControl()
	{
		if(Event.current.type != EventType.KeyDown || GUIUtility.keyboardControl != 0)
			return;
		switch(Event.current.keyCode)
		{
			case KeyCode.UpArrow:
				--SelectedIndex;
				Event.current.Use();
				break;
			case KeyCode.DownArrow:
				++SelectedIndex;
				Event.current.Use();
				break;
		}
	}

	public interface ITab
	{
		GUIContent Title { get; }
		void OnGUI();
	}

	public class TabOne : ITab
	{
		public GUIContent Title
		{
			get { return new GUIContent("Page #1"); }
			//get { return new GUIContent("Page #1", (Texture)EditorGUIUtility.FindTexture("Folder Icon")); }
		}

		public void OnGUI()
		{
			GUILayout.Label("Content here");
			
			GUILayout.FlexibleSpace();

			if(GUILayout.Button("Use Defaults", GUILayout.Width(120)))
				Debug.LogWarning("This button does nothing! You fool!");
		}
	}

	public class TabTwo : ITab
	{
		public GUIContent Title
		{
			get { return new GUIContent("Page #2"); }
		}

		public void OnGUI()
		{
			GUILayout.Label("Placeholder");
		}
	}

	//KeyMods
	public const string CTRL = "%"; //Command key on mac
	public const string ALT = "&";
	public const string SHIFT = "#";
	public const string R_SHIFT = "#RIGHT";
	public const string L_SHIFT = "#LEFT";

	//Seems to be broken in Unity
	public const string NO_MOD = "_"; //NO_MOD + "B" will open the menu when B is pressed

	public const string LEFT = "LEFT";
	public const string RIGHT = "RIGHT";
	public const string UP = "UP";
	public const string DOWN = "DOWN";

	public const string HOME = "HOME";
	public const string END = "END";
	public const string PAGE_UP = "PGUP";
	public const string PAGE_DOWN = "PGDN";

	public const string F1 = "F1";
	public const string F2 = "F2";
	public const string F3 = "F3";
	public const string F4 = "F4";
	public const string F5 = "F5";
	public const string F6 = "F6";
	public const string F7 = "F7";
	public const string F8 = "F8";
	public const string F9 = "F9";
	public const string F10 = "F10";
	public const string F11 = "F11";
	public const string F12 = "F12";
}