WIP FileSelector

Toolkit.Avalonia/FileSelector.cs

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+using Avalonia.Controls;
+using Toolkit.Foundation;
+
+namespace Toolkit.Avalonia;
+
+public class FileSelector : 
+    IFileSelector
+{
+    public async Task<IEnumerable<string>> SelectFiles(FileFilter filter)
+    {
+        //TopLevel topLevel = TopLevel.GetTopLevel(control);
+
+        //var openFileDialog = new OpenFileDialog();
+        //openFileDialog.Filters.Add(new FileDialogFilter
+        //{
+        //    Name = filter.Name,
+        //    Extensions = filter.Extensions
+        //});
+
+        //openFileDialog.AllowMultiple = filter.AllowMultiple;
+
+        //var results = await openFileDialog.ShowAsync(window as Window);
+
+        //if (results != null && results.Length > 0)
+        //{
+        //    return results.Select(result => result);
+        //}
+        return Enumerable.Empty<string>();
+    }
+}

Toolkit.Foundation/FileFilter.cs

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+namespace Toolkit.Foundation;
+
+public record FileFilter(string Name, List<string> Extensions, bool AllowMultiple = false);

Toolkit.Foundation/IFileSelector.cs

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+namespace Toolkit.Foundation;
+
+public interface IFileSelector
+{
+    Task<IEnumerable<string>> SelectFiles(FileFilter filter);
+}