Hua.Todo/src/Hua.Todo.Maui/Platforms/Windows/MainPage.Windows.cs

using Microsoft.Maui.Controls;
using Microsoft.Maui.ApplicationModel;
using Microsoft.Maui.Handlers;

namespace Hua.Todo.Maui.Views
{
    /// <summary>
    /// Windows 平台特定的 MainPage 逻辑（分部类）。
    /// 该文件仅在 Windows 目标框架下参与编译，用于接入 Windows 全局键盘事件等能力。
    /// </summary>
    public partial class MainPage
    {
        private Platforms.Windows.WindowsKeyboardHandler? _keyboardHandler;

        /// <summary>
        /// Windows 平台特定的键盘处理器设置。
        /// 当前仅监听 Esc 键，用于快速最小化窗口（与桌面端交互习惯保持一致）。
        /// </summary>
        partial void PlatformSetupKeyboardHandler()
        {
            _keyboardHandler = new Platforms.Windows.WindowsKeyboardHandler();
            _keyboardHandler.EscKeyPressed += OnEscKeyPressed;
            _keyboardHandler.Start();
        }

        /// <summary>
        /// Windows 平台特定的 Esc 键处理（最小化窗口）。
        /// </summary>
        /// <param name="window">当前窗口。</param>
        partial void PlatformOnEscKeyPressed(Window window)
        {
            var windowService = new Platforms.Windows.WindowsWindowService();
            windowService.MinimizeWindow(window);
        }

        /// <summary>
        /// 配置 WebView 滚动条行为。
        /// </summary>
        partial void ConfigureWebViewScrollBars()
        {
            // 使用 JavaScript 注入的方式禁用滚动条
            MainWebView.EvaluateJavaScriptAsync(@"
                // 禁用页面垂直滚动条
                document.body.style.overflowY = 'hidden';
                // 禁用整个文档的滚动
                document.documentElement.style.overflowY = 'hidden';
            ");
        }

        partial void PlatformPrepareWebViewContainer()
        {
            if (Platforms.Windows.WebView2RuntimeDetector.IsRuntimeInstalled(out _))
            {
                return;
            }

            _isWebViewContainerReady = false;

            var downloadUrl = "https://developer.microsoft.com/microsoft-edge/webview2/";
            var content = new VerticalStackLayout
            {
                Padding = new Thickness(20),
                Spacing = 12,
                Children =
                {
                    new Label
                    {
                        Text = "检测到系统未安装 WebView2 Runtime，无法加载主界面。",
                        FontSize = 16
                    },
                    new Label
                    {
                        Text = "请安装 Microsoft Edge WebView2 Runtime（Evergreen），安装完成后重新打开应用。",
                        Opacity = 0.85
                    },
                    new Button
                    {
                        Text = "打开下载页面",
                        Command = new Command(async () =>
                        {
                            await Launcher.Default.OpenAsync(downloadUrl);
                        })
                    },
                    new Button
                    {
                        Text = "退出应用",
                        Command = new Command(() =>
                        {
                            Microsoft.Maui.Controls.Application.Current?.Quit();
                        })
                    }
                }
            };

            Content = new ScrollView { Content = content };
        }
    }
}