优化更新代码，添加界面功能并整合

WPFluent/Controls/Scroll/EventIdentifier.cs

@@ -0,0 +1,38 @@
+
+
+
+using WPFluent.Extensions;
+
+namespace WPFluent.Controls;
+
+/// <summary>
+/// Class used to create identifiers of threads or tasks that can be performed multiple times within one instance. <see
+/// cref="Current"/> represents roughly the time in microseconds at which it was taken.
+/// </summary>
+internal class EventIdentifier
+{
+    /// <summary>
+    /// Creates and assigns a random value with an extra time code if possible.
+    /// </summary>
+    private void UpdateIdentifier() => Current = DateTime.Now.GetMicroTimestamp();
+
+    /// <summary>
+    /// Creates and gets the next identifier.
+    /// </summary>
+    public long GetNext()
+    {
+        UpdateIdentifier();
+
+        return Current;
+    }
+
+    /// <summary>
+    /// Checks if the identifiers are the same.
+    /// </summary>
+    public bool IsEqual(long storedId) => Current == storedId;
+
+    /// <summary>
+    /// Gets or sets the current identifier.
+    /// </summary>
+    public long Current { get; internal set; } = 0;
+}