ILSpy/ILSpy.Tests/WindowExtensions.cs

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using System;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Runtime.CompilerServices;

using Avalonia.Controls;
using Avalonia.Headless;
using Avalonia.Threading;

namespace ICSharpCode.ILSpy.Tests;

public static class WindowExtensions
{
	/// <summary>Snapshots the window with Skia, writes a temp PNG, and opens it in the OS
	/// image viewer. No-op when <c>UseHeadlessDrawing</c> is true (CI default).</summary>
	public static void CaptureAndShow(this Window window, [CallerMemberName] string? label = null)
	{
		ArgumentNullException.ThrowIfNull(window);
		Dispatcher.UIThread.RunJobs();

		var frame = window.CaptureRenderedFrame();
		if (frame is null)
			return;

		var fileName = $"ILSpy.Tests-{Sanitize(label)}-{DateTime.Now:HHmmss-fff}.png";
		var path = Path.Combine(Path.GetTempPath(), fileName);
		frame.Save(path);

		try
		{
			Process.Start(new ProcessStartInfo {
				FileName = path,
				UseShellExecute = true,
			});
		}
		catch (Exception ex)
		{
			Console.Error.WriteLine($"CaptureAndShow: failed to launch viewer for {path}: {ex.Message}");
		}
	}

	static string Sanitize(string? label)
	{
		if (string.IsNullOrWhiteSpace(label))
			return "frame";
		return new string(label.Select(c => char.IsLetterOrDigit(c) ? c : '_').ToArray());
	}
}