qymessagecenter/QYMessageCenter.Client/PopupManager.cs

using CommunityToolkit.Mvvm.Messaging;
using CommunityToolkit.Mvvm.Messaging.Messages;
using QYMessageCenter.Client.Models;

namespace QYMessageCenter.Client
{
    public class PopupManager
    {
        private List<Message> MessageList { get; set; }


        private PopupWindow pw;

        public PopupManager()
        {
            MessageList = new List<Message>();
            WeakReferenceMessenger.Default.Register<MVVMMessage_ShowNext>(this, (o, x) => ShowNext());
        }

        public void Show(Message msg)
        {
            MessageList.Insert(0, msg);
            Show();
        }

        private void Show()
        {
            var msg = MessageList[0];
            if (pw != null)
            {
                pw.RefreshMsg(msg);
            }
            else
            {
                pw = new PopupWindow(msg);
                pw.Closed += Pw_Closed;
                pw.Show();
            }
        }

        private void Pw_Closed(object? sender, EventArgs e)
        {
            pw = null;
            MessageList.Clear();
        }

        public void ShowNext()
        {
            if (MessageList.Count() > 0)
                MessageList.RemoveAt(0);
            if (MessageList.Count() == 0)
                pw.Close();
            else
                Show();
        }
    }

    public class MVVMMessage_ShowNext : ValueChangedMessage<object>
    {
        public MVVMMessage_ShowNext(object value) : base(value)
        {
        }
    }
}