MyAvaloniaDemo/MainWindow.axaml.cs

using System;
using Avalonia.Controls;
using Avalonia.Controls.Primitives;
using Avalonia.Input;
using Avalonia.Markup.Xaml;
using Avalonia.ReactiveUI;
using Microsoft.Extensions.Logging;
using MyAvaloniaApp.ViewModels;
using ReactiveUI;
using System.Reactive.Disposables;

namespace MyAvaloniaApp;

public partial class MainWindow : ReactiveWindow<MainWindowViewModel>, IActivatableView
{
    private readonly ILogger<MainWindow>? _logger;

    /// <summary>
    /// 无参构造函数，用于 XAML 设计器
    /// </summary>
    public MainWindow()
    {
        InitializeComponent();
        SetupWindowControls();
    }

    /// <summary>
    /// 构造函数，接受依赖注入的 ViewModel
    /// </summary>
    /// <param name="viewModel">主窗口的 ViewModel</param>
    /// <param name="logger">日志记录器</param>
    public MainWindow(MainWindowViewModel viewModel, ILogger<MainWindow>? logger = null)
    {
        ArgumentNullException.ThrowIfNull(viewModel);

        _logger = logger;
        InitializeComponent();
        ViewModel = viewModel;
        SetupWindowControls();
        
        _logger?.LogInformation("MainWindow 已创建，ViewModel 已设置");
        
        // 使用 WhenActivated 管理订阅
        this.WhenActivated(disposables =>
        {
            // 可以在这里添加窗口级别的订阅，如果需要的话
            // 例如：this.WhenAnyValue(x => x.ViewModel.Title)
            //     .Subscribe(title => ...)
            //     .DisposeWith(disposables);
        });
    }

    private void InitializeComponent()
    {
        AvaloniaXamlLoader.Load(this);
    }

    /// <summary>
    /// 设置窗口控制按钮事件
    /// </summary>
    private void SetupWindowControls()
    {
        // 设置标题栏拖动功能
        var titleBarGrid = this.FindControl<Grid>("TitleBarGrid");
        if (titleBarGrid != null)
        {
            titleBarGrid.PointerPressed += OnTitleBarPointerPressed;
        }

        // 最小化按钮
        var minimizeButton = this.FindControl<Button>("MinimizeButton");
        if (minimizeButton != null)
        {
            minimizeButton.Click += (sender, e) => WindowState = WindowState.Minimized;
        }

        // 最大化/还原按钮
        var maximizeButton = this.FindControl<Button>("MaximizeButton");
        if (maximizeButton != null)
        {
            maximizeButton.Click += (sender, e) =>
            {
                if (WindowState == WindowState.Maximized)
                {
                    WindowState = WindowState.Normal;
                    ToolTip.SetTip(maximizeButton, "最大化");
                }
                else
                {
                    WindowState = WindowState.Maximized;
                    ToolTip.SetTip(maximizeButton, "还原");
                }
            };
        }

        // 关闭按钮
        var closeButton = this.FindControl<Button>("CloseButton");
        if (closeButton != null)
        {
            closeButton.Click += (sender, e) => Close();
        }
    }

    /// <summary>
    /// 处理标题栏鼠标按下事件，实现窗口拖动
    /// </summary>
    private void OnTitleBarPointerPressed(object? sender, PointerPressedEventArgs e)
    {
        if (e.GetCurrentPoint(this).Properties.IsLeftButtonPressed)
        {
            BeginMoveDrag(e);
        }
    }
}