1 files changed, 45 insertions, 0 deletions
diff --git a/Juick/Classes/DeferredLoadListBoxItem.cs b/Juick/Classes/DeferredLoadListBoxItem.cs
new file mode 100644
index 0000000..97bfc18
--- /dev/null
+++ b/Juick/Classes/DeferredLoadListBoxItem.cs
@@ -0,0 +1,45 @@
+// Copyright (C) Microsoft Corporation. All Rights Reserved.
+// This code released under the terms of the Microsoft Public License
+// (Ms-PL, http://opensource.org/licenses/ms-pl.html).
+
+using System.Windows;
+using System.Windows.Controls;
+
+namespace Juick.Classes
+{
+    /// <summary>
+    /// Implements a subclass of ListBoxItem that is used in conjunction with
+    /// the DeferredLoadListBox to defer the loading of off-screen items.
+    /// </summary>
+    public class DeferredLoadListBoxItem : ListBoxItem
+    {
+        private object _maskedContent;
+        private DataTemplate _maskedContentTemplate;
+
+        internal bool Masked { get; set; }
+
+        internal void MaskContent()
+        {
+            if (!Masked)
+            {
+                _maskedContent = Content;
+                _maskedContentTemplate = ContentTemplate;
+                Content = null;
+                ContentTemplate = null;
+                Masked = true;
+            }
+        }
+
+        internal void UnmaskContent()
+        {
+            if (Masked)
+            {
+                ContentTemplate = _maskedContentTemplate;
+                Content = _maskedContent;
+                _maskedContentTemplate = null;
+                _maskedContent = null;
+                Masked = false;
+            }
+        }
+    }
+}