feat: Add ManagedFileChooser

demo/Semi.Avalonia.Demo/Pages/ManagedFileChooserDemo.axaml.cs

@@ -0,0 +1,72 @@
+using System;
+using System.Collections.Generic;
+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Dialogs;
+using Avalonia.Interactivity;
+using Avalonia.Markup.Xaml;
+using Avalonia.Platform.Storage;
+
+namespace Semi.Avalonia.Demo.Pages;
+
+public partial class ManagedFileChooserDemo : UserControl
+{
+    public ManagedFileChooserDemo()
+    {
+        InitializeComponent();
+        openFileDialog.Click += OpenFileDialog;
+        selectFolderDialog.Click += SelectFolderDialog;
+        saveFileDialog.Click += SaveFileDialog;
+    }
+
+    private async void OpenFileDialog(object sender, RoutedEventArgs args)
+    {
+        IStorageProvider sp = GetStorageProvider();
+        var result = await sp.OpenFilePickerAsync(new FilePickerOpenOptions()
+        {
+            Title = "Open File",
+            FileTypeFilter = GetFileTypes(),
+            AllowMultiple = true,
+        });
+    }
+    private async void SelectFolderDialog(object sender, RoutedEventArgs args)
+    {
+        IStorageProvider sp = GetStorageProvider();
+        var result = await sp.OpenFolderPickerAsync(new FolderPickerOpenOptions()
+        {
+            Title = "Select Folder",
+            AllowMultiple = true,
+        });
+    }
+    private async void SaveFileDialog(object sender, RoutedEventArgs args)
+    {
+        IStorageProvider sp = GetStorageProvider();
+        var result = await sp.SaveFilePickerAsync(new FilePickerSaveOptions()
+        {
+            Title = "Open File",
+        });
+    }
+    
+    private IStorageProvider GetStorageProvider()
+    {
+        return new ManagedStorageProvider<Window>(GetWindow(), null);
+    }
+
+    private static string FullPathOrName(IStorageItem? item)
+    {
+        if (item is null) return "(null)";
+        return item.TryGetUri(out var uri) ? uri.ToString() : item.Name;
+    }
+
+    Window GetWindow() => this.VisualRoot as Window ?? throw new NullReferenceException("Invalid Owner");
+    TopLevel GetTopLevel() => this.VisualRoot as TopLevel ?? throw new NullReferenceException("Invalid Owner");
+    
+    List<FilePickerFileType>? GetFileTypes()
+    {
+        return new List<FilePickerFileType>
+        {
+            FilePickerFileTypes.All,
+            FilePickerFileTypes.TextPlain
+        };
+    }
+}