Unity Dockable Snap Settings Window

DockableSnapSettings

using System;
using System.Linq;
using System.Reflection;
using UnityEditor;
using UnityEngine;

/// <summary>
/// Custom dock-able editor window that allows to change snap settings
/// </summary>
public class DockableSnapSettings : EditorWindow 
{
	#region Snap Properties
	private static Vector3 MoveSnap
	{
		get
		{
			return new Vector3(	EditorPrefs.GetFloat("MoveSnapX", 1f), 
								EditorPrefs.GetFloat("MoveSnapY", 1f),
								EditorPrefs.GetFloat("MoveSnapZ", 1f));

		}
		set
		{
			EditorPrefs.SetFloat("MoveSnapX", value.x);
			EditorPrefs.SetFloat("MoveSnapY", value.y);
			EditorPrefs.SetFloat("MoveSnapZ", value.z);
		}
	}

	private static float ScaleSnap
	{
		get
		{
			return EditorPrefs.GetFloat("ScaleSnap", 1f);
		}
		set
		{
			EditorPrefs.SetFloat("ScaleSnap", value);
		}
	}

	private static float RotationSnap
	{
		get
		{
			return EditorPrefs.GetFloat("RotationSnap", 1f);
		}
		set
		{
			EditorPrefs.SetFloat("RotationSnap", value);
		}
	}
	#endregion

	private static Type _snapType;
	private const BindingFlags BINDING = BindingFlags.Public | BindingFlags.Static;

	[MenuItem("Window/Dockable Snap")]
	static void Init()
	{
		var dockSnap = GetWindow<DockableSnapSettings>("Snap Settings");
		dockSnap.minSize = new Vector2(200, 80);
	}

	/// <summary>
	/// Initialize expensive objects here
	/// </summary>
	private static void InitializeValues()
	{
		_snapType = AppDomain.CurrentDomain.GetAssemblies()
			.SelectMany(assembly => assembly.GetTypes())
			.FirstOrDefault(t => t.FullName == "UnityEditor.SnapSettings");
	}

	/// <summary>
	/// Unity built-in method for drawing the content of the window
	/// </summary>
	void OnGUI()
	{
		MoveSnap = EditorGUILayout.Vector3Field("Move", MoveSnap);
		RotationSnap = EditorGUILayout.FloatField("Rotation", RotationSnap);
		ScaleSnap = EditorGUILayout.FloatField("Scale", ScaleSnap);

		if (GUI.changed)
		{
			UpdateSnapSettings();
		}
	}

	/// <summary>
	/// Responsible for updating the static SnapSettings values that the editor actually uses so the changes will take effect
	/// </summary>
	private void UpdateSnapSettings()
	{
		// make sure we have the type reference
		if (_snapType == null)
		{
			InitializeValues();
		}
		
		// set move snap value
		var move = _snapType.GetProperty("move", BINDING);
		move.SetValue(_snapType, MoveSnap, null);

		// set rotate snap value
		var scale = _snapType.GetProperty("scale", BINDING);
		scale.SetValue(_snapType, ScaleSnap, null);

		// set scale snap value
		var rotate = _snapType.GetProperty("rotation", BINDING);
		rotate.SetValue(_snapType, RotationSnap, null);
	}
}