feat: WebView2 运行时缺失时回退提示窗

检测不到 WebView2 运行时则显示安装引导窗，
后端照常启动以便导出模式局域网访问

Author: Applesaber

ChuChartManager/AppMain.cs

@@ -6,6 +6,7 @@ public partial class AppMain : ISingleInstance
 {
     public static Browser? BrowserWin { get; set; }
     public static OobeBrowser? OobeBrowserWin { get; set; }
+    public static LauncherForm? LauncherWin { get; set; }
     public static SynchronizationContext? UiContext { get; set; }
 
     public static void ShowBrowser(string loopbackUrl)

ChuChartManager/LauncherForm.cs

@@ -0,0 +1,64 @@
+using System.Diagnostics;
+
+namespace ChuChartManager;
+
+public class LauncherForm : Form
+{
+    private const string WebView2DownloadUrl = "https://developer.microsoft.com/microsoft-edge/webview2/";
+
+    public LauncherForm()
+    {
+        Text = "ChuChartManager";
+        Width = 520;
+        Height = 280;
+        StartPosition = FormStartPosition.CenterScreen;
+        FormBorderStyle = FormBorderStyle.FixedDialog;
+        MaximizeBox = false;
+        MinimizeBox = false;
+
+        var iconPath = Path.Combine(AppContext.BaseDirectory, "icon.ico");
+        if (File.Exists(iconPath))
+            Icon = new Icon(iconPath);
+
+        var message = new Label
+        {
+            Text = "ChuChartManager 需要 Microsoft Edge WebView2 运行时才能显示界面。\n\n"
+                   + "当前系统未安装该运行时，请先安装后重新启动本程序。",
+            Dock = DockStyle.Top,
+            Height = 140,
+            Padding = new Padding(24, 32, 24, 0),
+            Font = new Font("Microsoft YaHei UI", 10),
+        };
+
+        var installButton = new Button
+        {
+            Text = "下载并安装 WebView2",
+            Width = 200,
+            Height = 40,
+            Left = 24,
+            Top = 170,
+        };
+        installButton.Click += (_, _) =>
+            Process.Start(new ProcessStartInfo(WebView2DownloadUrl) { UseShellExecute = true });
+
+        var exitButton = new Button
+        {
+            Text = "退出",
+            Width = 120,
+            Height = 40,
+            Left = 360,
+            Top = 170,
+        };
+        exitButton.Click += (_, _) => Close();
+
+        Controls.Add(message);
+        Controls.Add(installButton);
+        Controls.Add(exitButton);
+    }
+
+    protected override void OnFormClosed(FormClosedEventArgs e)
+    {
+        base.OnFormClosed(e);
+        Application.Exit();
+    }
+}

ChuChartManager/Program.cs

@@ -28,7 +28,15 @@ public static void Main()
                 var scanner = new MusicScanner(StaticSettings.GamePath);
                 scanner.ScanAll();
                 StaticSettings.Scanner = scanner;
+            }
 
+            if (!WebViewHelper.IsRuntimeAvailable())
+            {
+                AppMain.LauncherWin = new LauncherForm();
+                AppMain.LauncherWin.Show();
+            }
+            else if (hasGamePath)
+            {
                 AppMain.BrowserWin = new Browser();
                 AppMain.BrowserWin.Show();
             }

ChuChartManager/WebViewHelper.cs

@@ -4,6 +4,18 @@ namespace ChuChartManager;
 
 public static class WebViewHelper
 {
+    public static bool IsRuntimeAvailable()
+    {
+        try
+        {
+            return !string.IsNullOrEmpty(CoreWebView2Environment.GetAvailableBrowserVersionString());
+        }
+        catch
+        {
+            return false;
+        }
+    }
+
     public static void SetupCoreWebView2(CoreWebView2 coreWebView2, Uri? loopbackUrl)
     {
         coreWebView2.SetVirtualHostNameToFolderMapping(