Add clipboard file setting extensions

StabilityMatrix.Avalonia/Extensions/ClipboardExtensions.cs

@@ -0,0 +1,58 @@
+using System.Collections.Generic;
+using System.IO;
+using System.Threading.Tasks;
+using Avalonia.Input;
+using Avalonia.Input.Platform;
+using Avalonia.Platform.Storage;
+
+namespace StabilityMatrix.Avalonia.Extensions;
+
+public static class ClipboardExtensions
+{
+    private static IStorageProvider StorageProvider => App.StorageProvider;
+
+    /// <summary>
+    /// Set file paths to the clipboard.
+    /// </summary>
+    /// <exception cref="IOException">Thrown if unable to get file from path</exception>
+    public static async Task SetFileDataObjectAsync(
+        this IClipboard clipboard,
+        params string[] filePaths
+    )
+    {
+        await clipboard.SetFileDataObjectAsync((IEnumerable<string>)filePaths);
+    }
+
+    /// <summary>
+    /// Set file paths to the clipboard.
+    /// </summary>
+    /// <exception cref="IOException">Thrown if unable to get file from path</exception>
+    public static async Task SetFileDataObjectAsync(
+        this IClipboard clipboard,
+        IEnumerable<string> filePaths
+    )
+    {
+        var files = new List<IStorageFile>();
+
+        foreach (var filePath in filePaths)
+        {
+            var file = await StorageProvider.TryGetFileFromPathAsync(filePath);
+            if (file is null)
+            {
+                throw new IOException($"File {filePath} was not found");
+            }
+
+            files.Add(file);
+        }
+
+        if (files.Count == 0)
+        {
+            return;
+        }
+
+        var dataObject = new DataObject();
+        dataObject.Set(DataFormats.Files, files);
+
+        await clipboard.SetDataObjectAsync(dataObject);
+    }
+}