elwig/Elwig/Windows/ContextWindow.cs

using Elwig.Helpers;
using System;
using System.Threading.Tasks;
using System.Windows;

namespace Elwig.Windows {
    public abstract class ContextWindow : Window {

        protected bool LockContext { get; set; } = false;
        private bool _renewPending = false;

        public ContextWindow() : base() {
            Loaded += OnLoaded;
        }

        public async Task HintContextChange() {
            _renewPending = true;
            if (LockContext) return;
            await RenewContext();
        }

        protected async void OnLoaded(object? sender, RoutedEventArgs? evt) {
            using var ctx = new AppDbContext();
            await OnRenewContext(ctx);
        }

        protected async Task RenewContext() {
            if (!_renewPending) return;
            using var ctx = new AppDbContext();
            await OnRenewContext(ctx);
            _renewPending = false;
        }

        abstract protected Task OnRenewContext(AppDbContext ctx);
    }
}