COM3D2.MeidoPhotoStudio/src/MeidoPhotoStudio.Plugin/Patchers/BgMgrPatcher.cs

using System;

using HarmonyLib;

namespace MeidoPhotoStudio.Plugin;

public static class BgMgrPatcher
{
    public static event EventHandler ChangeBgBegin;

    public static event EventHandler ChangeBgEnd;

    [HarmonyPatch(typeof(BgMgr), nameof(BgMgr.ChangeBg))]
    [HarmonyPatch(typeof(BgMgr), nameof(BgMgr.ChangeBgMyRoom))]
    [HarmonyPrefix]
    private static void NotifyBeginChangeBg() =>
        ChangeBgBegin?.Invoke(null, EventArgs.Empty);

    [HarmonyPatch(typeof(BgMgr), nameof(BgMgr.ChangeBg))]
    [HarmonyPatch(typeof(BgMgr), nameof(BgMgr.ChangeBgMyRoom))]
    [HarmonyPostfix]
    private static void NotifyEndChangeBg() =>
        ChangeBgEnd?.Invoke(null, EventArgs.Empty);
}