【Unity】Tilemap で Tile Palette の Active Tilemap が変更された時に呼び出されるイベント

ソースコード

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

public static class EditorApplicationUtility
{
    private const BindingFlags BINDING_ATTR = BindingFlags.Static | BindingFlags.Public;

    private static readonly Assembly  m_assembly = typeof( AssetDatabase ).Assembly;
    private static readonly Type      m_type     = m_assembly.GetType( "UnityEditor.GridPaintingState" );
    private static readonly EventInfo m_info     = m_type.GetEvent( "scenePaintTargetChanged", BINDING_ATTR );

    public static event Action<GameObject> scenePaintTargetChanged
    {
        add => m_info.AddEventHandler( null, value );
        remove => m_info.RemoveEventHandler( null, value );
    }
}

使い方

using UnityEditor;
using UnityEngine;

[InitializeOnLoad]
public static class Example
{
    static Example()
    {
        EditorApplicationUtility.scenePaintTargetChanged += OnChanged;
    }

    private static void OnChanged( GameObject gameObject )
    {
        Debug.Log( gameObject.name );
    }
}

Tile Palette の Active Tilemap が変更された時に呼び出されます

引数には新しく Active Tilemap に設定されたゲームオブジェクトが渡ってきます