detect/detect.gui/VWMS/ViewModelBase.cs

using System;
using Avalonia.Controls.Notifications;
using Avalonia.Threading;
using detect.gui.Classes;
using detect.gui.ViewModels;
using detect.gui.VWS;
using ReactiveUI;

namespace detect.gui.VWMS;


public class ViewModelBase<T> : ReactiveObject where T : new()
{
    private static T? _instance;

    public static T Instance()
    {
        return _instance ??= new T();
    }
    
    private bool _isLoading;
    public bool IsLoading
    {
        get => _isLoading;
        set => this.RaiseAndSetIfChanged(ref _isLoading, value);
    }
        
    private MessageItem? _message;

    protected MessageItem? Message
    {
        get => _message;
        set => this.RaiseAndSetIfChanged(ref _message, value);
    }
    
    protected ViewModelBase()
    {
        this.WhenAnyValue(x => x.Message).Subscribe(m =>
        {
            if (m == null) return;
            Dispatcher.UIThread.Invoke(() =>
            {
                var title = m.NotificationType switch
                {
                    NotificationType.Error => "错误信息",
                    NotificationType.Success => "成功信息",
                    NotificationType.Information => "提示信息",
                    NotificationType.Warning => "警告信息",
                    _ => ""
                };
                NotificationService.Show(title, m.Text, m.NotificationType);
            });
        });
    }
}

public class MessageItem : ReactiveObject
{
    private readonly string? _text;
    public string? Text
    {
        get => _text;
        init => this.RaiseAndSetIfChanged(ref _text, value);
    }
        
    private readonly NotificationType _notificationType;
    public NotificationType NotificationType
    {
        get => _notificationType;
        init => this.RaiseAndSetIfChanged(ref _notificationType, value);
    }

    public MessageItem(string? text, NotificationType notificationType)
    {
        _text = text;
        _notificationType = notificationType;
    }
}