CoreBaseViewModel.cs

using System;
using System.Threading.Tasks;
using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Messaging;
using Wino.Core.Domain.Entities.Shared;
using Wino.Core.Domain.Interfaces;
using Wino.Core.Domain.Models.Navigation;
using Wino.Messaging.UI;

namespace Wino.Core.ViewModels
{
    public class CoreBaseViewModel : ObservableRecipient,
        INavigationAware,
        IRecipient<AccountCreatedMessage>,
        IRecipient<AccountRemovedMessage>,
        IRecipient<AccountUpdatedMessage>
    {
        private IDispatcher _dispatcher;
        public IDispatcher Dispatcher
        {
            get
            {
                return _dispatcher;
            }
            set
            {
                _dispatcher = value;

                if (value != null)
                {
                    OnDispatcherAssigned();
                }
            }
        }

        public virtual void OnNavigatedTo(NavigationMode mode, object parameters) { IsActive = true; }

        public virtual void OnNavigatedFrom(NavigationMode mode, object parameters) { IsActive = false; }

        public virtual void OnPageLoaded() { }

        public async Task ExecuteUIThread(Action action) => await Dispatcher?.ExecuteOnUIThread(action);
        public void ReportUIChange<TMessage>(TMessage message) where TMessage : class, IUIMessage => Messenger.Send(message);

        protected virtual void OnDispatcherAssigned() { }

        protected virtual void OnAccountCreated(MailAccount createdAccount) { }
        protected virtual void OnAccountRemoved(MailAccount removedAccount) { }
        protected virtual void OnAccountUpdated(MailAccount updatedAccount) { }

        void IRecipient<AccountCreatedMessage>.Receive(AccountCreatedMessage message) => OnAccountCreated(message.Account);
        void IRecipient<AccountRemovedMessage>.Receive(AccountRemovedMessage message) => OnAccountRemoved(message.Account);
        void IRecipient<AccountUpdatedMessage>.Receive(AccountUpdatedMessage message) => OnAccountUpdated(message.Account);
    }
}