GridAndSnapWindow.cs

README.md

A little window for modifying Grid Snapping: Grid Size and Increment Snapping: Move quickly and easily.

GridAndSnapWindow.cs

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

public class GridAndSnapWindow : EditorWindow
{
    private static readonly float[] valuePresets = new float[] { 1f, .5f, .25f, .1f, .05f, .01f };

    private PropertyInfo propInfoGridSize;
    private PropertyInfo propInfoSnapMove;

    [MenuItem("Window/Custom/GridAndSnap")]
    static void OpenWindow()
    {
        var window = (GridAndSnapWindow)EditorWindow.GetWindow(typeof(GridAndSnapWindow));
        window.Show();
    }

    void OnGUI()
    {
        Init();

        EditorGUILayout.BeginVertical();
        EditorGUILayout.BeginHorizontal();
        EditorGUIUtility.labelWidth = 16f;

        EditorGUILayout.BeginVertical();
        AddGridSizeField();
        EditorGUILayout.Space();
        AddGridSizePresetButtons();
        EditorGUILayout.EndVertical();

        EditorGUILayout.Space();

        EditorGUILayout.BeginVertical();
        AddSnapMoveField();
        EditorGUILayout.Space();
        AddSnapMovePresetButtons();
        EditorGUILayout.EndVertical();

        EditorGUIUtility.labelWidth = 0f;
        EditorGUILayout.EndHorizontal();
        EditorGUILayout.EndVertical();
    }

    private void Init()
    {
        Assembly assembly = Assembly.Load("UnityEditor.dll");

        // https://github.com/Unity-Technologies/UnityCsReference/blob/master/Editor/Mono/SceneView/SceneViewGrid.cs#L11
        Type gridSettings = assembly.GetType("UnityEditor.GridSettings");
        this.propInfoGridSize = gridSettings.GetProperty("size");

        // https://github.com/Unity-Technologies/UnityCsReference/blob/master/Editor/Mono/Grids/EditorSnap.cs#L47
        Type editorSnapSettings = assembly.GetType("UnityEditor.EditorSnapSettings");
        this.propInfoSnapMove = editorSnapSettings.GetProperty("move");
    }

    private void AddGridSizeField()
    {
        float gsOld = gridSize.x;
        float gsNew = EditorGUILayout.FloatField("G: ", gsOld);
        if (gsNew != gsOld)
        {
            gridSize = new Vector3(gsNew, gsNew, gsNew);
        }
    }

    private void AddSnapMoveField()
    {
        float smOld = snapMove.x;
        float smNew = EditorGUILayout.FloatField("S: ", smOld);
        if (smNew != smOld)
        {
            snapMove = new Vector3(smNew, smNew, smNew);
        }
    }

    private void AddGridSizePresetButtons()
    {
        AddPresetButtons(valuePresets, (v) => gridSize = new Vector3(v, v, v));
    }

    private void AddSnapMovePresetButtons()
    {
        AddPresetButtons(valuePresets, (v) => snapMove = new Vector3(v, v, v));
    }

    private void AddPresetButtons(float[] valuePresets, Action<float> onPressed)
    {
        EditorGUILayout.BeginHorizontal();
        for (int i = 0; i < valuePresets.Length; i++)
        {
            if (i % 2 == 0)
            {
                EditorGUILayout.EndHorizontal();
                EditorGUILayout.BeginHorizontal();
            }
            float v = valuePresets[i];
            if (GUILayout.Button($"{v:0.00}"))
            {
                onPressed(v);
            }
        }
        EditorGUILayout.EndHorizontal();
    }

    private Vector3 gridSize
    {
        get => (Vector3)propInfoGridSize.GetValue(null);
        set => propInfoGridSize.SetValue(null, value);
    }

    private Vector3 snapMove
    {
        get => (Vector3)propInfoSnapMove.GetValue(null);
        set => propInfoSnapMove.SetValue(null, value);
    }
}