MyAvaloniaDemo/ViewModels/NavigationItem.cs

using ReactiveUI;
using HeroIconsAvalonia.Enums;
using System;
using System.Collections.ObjectModel;

namespace MyAvaloniaApp.ViewModels;

/// <summary>
/// 导航项模型
/// </summary>
public class NavigationItem : ReactiveObject
{
    private string _title = string.Empty;
    private IconType _iconType = IconType.Home;
    private bool _isSelected;
    private bool _isExpanded;
    private IRoutableViewModel? _viewModel;
    private ObservableCollection<NavigationItem> _children = new();

    /// <summary>
    /// 导航项标题
    /// </summary>
    public string Title
    {
        get => _title;
        set => this.RaiseAndSetIfChanged(ref _title, value);
    }

    /// <summary>
    /// 导航项图标类型
    /// </summary>
    public IconType IconType
    {
        get => _iconType;
        set => this.RaiseAndSetIfChanged(ref _iconType, value);
    }

    /// <summary>
    /// 是否选中
    /// </summary>
    public bool IsSelected
    {
        get => _isSelected;
        set => this.RaiseAndSetIfChanged(ref _isSelected, value);
    }

    /// <summary>
    /// 是否展开（用于二级导航）
    /// </summary>
    public bool IsExpanded
    {
        get => _isExpanded;
        set => this.RaiseAndSetIfChanged(ref _isExpanded, value);
    }

    /// <summary>
    /// 导航项的 ViewModel（用于路由导航）
    /// </summary>
    public IRoutableViewModel? ViewModel
    {
        get => _viewModel;
        set => this.RaiseAndSetIfChanged(ref _viewModel, value);
    }

    /// <summary>
    /// 子导航项集合（用于二级导航）
    /// </summary>
    public ObservableCollection<NavigationItem> Children
    {
        get => _children;
        set => this.RaiseAndSetIfChanged(ref _children, value);
    }

    /// <summary>
    /// 导航项标识符
    /// </summary>
    public string Id { get; set; } = string.Empty;

    /// <summary>
    /// 是否有子项
    /// </summary>
    public bool HasChildren => Children?.Count > 0;
}