refine #1334

src/Snap.Hutao/Snap.Hutao/Control/Collection/AdvancedCollectionView/AdvancedCollectionView.Defer.cs

@@ -0,0 +1,54 @@
+// Copyright (c) DGP Studio. All rights reserved.
+// Licensed under the MIT license.
+
+namespace Snap.Hutao.Control.Collection.AdvancedCollectionView;
+
+/// <summary>
+/// A collection view implementation that supports filtering, grouping, sorting and incremental loading
+/// </summary>
+internal partial class AdvancedCollectionView
+{
+    /// <summary>
+    /// Stops refreshing until it is disposed
+    /// </summary>
+    /// <returns>An disposable object</returns>
+    public IDisposable DeferRefresh()
+    {
+        return new NotificationDeferrer(this);
+    }
+
+    /// <summary>
+    /// Notification deferrer helper class
+    /// </summary>
+#pragma warning disable CA1063 // Implement IDisposable Correctly
+    public class NotificationDeferrer : IDisposable
+#pragma warning restore CA1063 // Implement IDisposable Correctly
+    {
+        private readonly AdvancedCollectionView _acvs;
+        private readonly object _currentItem;
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="NotificationDeferrer"/> class.
+        /// </summary>
+        /// <param name="acvs">Source ACVS</param>
+        public NotificationDeferrer(AdvancedCollectionView acvs)
+        {
+            _acvs = acvs;
+            _currentItem = _acvs.CurrentItem;
+            _acvs._deferCounter++;
+        }
+
+        /// <summary>
+        /// Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.
+        /// </summary>
+        /// <filterpriority>2</filterpriority>
+#pragma warning disable CA1063 // Implement IDisposable Correctly
+        public void Dispose()
+#pragma warning restore CA1063 // Implement IDisposable Correctly
+        {
+            _acvs.MoveCurrentTo(_currentItem);
+            _acvs._deferCounter--;
+            _acvs.Refresh();
+        }
+    }
+}

src/Snap.Hutao/Snap.Hutao/Control/Collection/AdvancedCollectionView/AdvancedCollectionView.Events.cs

@@ -0,0 +1,61 @@
+// Copyright (c) DGP Studio. All rights reserved.
+// Licensed under the MIT license.
+
+using Microsoft.UI.Xaml.Data;
+using Windows.Foundation.Collections;
+
+namespace Snap.Hutao.Control.Collection.AdvancedCollectionView;
+
+/// <summary>
+/// A collection view implementation that supports filtering, grouping, sorting and incremental loading
+/// </summary>
+internal partial class AdvancedCollectionView
+{
+    /// <summary>
+    /// Currently selected item changing event
+    /// </summary>
+    /// <param name="e">event args</param>
+    private void OnCurrentChanging(CurrentChangingEventArgs e)
+    {
+        if (_deferCounter > 0)
+        {
+            return;
+        }
+
+        CurrentChanging?.Invoke(this, e);
+    }
+
+    /// <summary>
+    /// Currently selected item changed event
+    /// </summary>
+    /// <param name="e">event args</param>
+    private void OnCurrentChanged(object e)
+    {
+        if (_deferCounter > 0)
+        {
+            return;
+        }
+
+        CurrentChanged?.Invoke(this, e);
+
+        // ReSharper disable once ExplicitCallerInfoArgument
+        OnPropertyChanged(nameof(CurrentItem));
+    }
+
+    /// <summary>
+    /// Vector changed event
+    /// </summary>
+    /// <param name="e">event args</param>
+    private void OnVectorChanged(IVectorChangedEventArgs e)
+    {
+        if (_deferCounter > 0)
+        {
+            return;
+        }
+
+        VectorChanged?.Invoke(this, e);
+
+        // ReSharper disable once ExplicitCallerInfoArgument
+        OnPropertyChanged(nameof(Count));
+    }
+}