1 files changed, 76 insertions, 0 deletions
diff --git a/UVtools.GUI/Controls/ListViewColumnSorter.cs b/UVtools.GUI/Controls/ListViewColumnSorter.cs
new file mode 100644
index 0000000..de0d344
--- /dev/null
+++ b/UVtools.GUI/Controls/ListViewColumnSorter.cs
@@ -0,0 +1,76 @@
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Forms;
+
+namespace UVtools.GUI.Controls
+{
+    /// <summary>
+    /// This class is an implementation of the 'IComparer' interface.
+    /// </summary>
+    public class ListViewColumnSorter : IComparer
+    {
+        /// <summary>
+        /// Case insensitive comparer object
+        /// </summary>
+        private readonly CaseInsensitiveComparer _objectCompare;
+
+        /// <summary>
+        /// Gets or sets the number of the column to which to apply the sorting operation (Defaults to '0').
+        /// </summary>
+        public int SortColumn { set; get; }
+
+        /// <summary>
+        /// Gets or sets the order of sorting to apply (for example, 'Ascending' or 'Descending').
+        /// </summary>
+        public SortOrder Order { set; get; }
+
+        /// <summary>
+        /// Class constructor. Initializes various elements
+        /// </summary>
+        public ListViewColumnSorter()
+        {
+            // Initialize the column to '0'
+            SortColumn = 0;
+
+            // Initialize the sort order to 'none'
+            Order = SortOrder.None;
+
+            // Initialize the CaseInsensitiveComparer object
+            _objectCompare = new CaseInsensitiveComparer();
+        }
+
+        /// <summary>
+        /// This method is inherited from the IComparer interface. It compares the two objects passed using a case insensitive comparison.
+        /// </summary>
+        /// <param name="x">First object to be compared</param>
+        /// <param name="y">Second object to be compared</param>
+        /// <returns>The result of the comparison. "0" if equal, negative if 'x' is less than 'y' and positive if 'x' is greater than 'y'</returns>
+        public int Compare(object x, object y)
+        {
+            // Cast the objects to be compared to ListViewItem objects
+            var listviewX = (ListViewItem)x;
+            var listviewY = (ListViewItem)y;
+
+            // Compare the two items
+            var compareResult = _objectCompare.Compare(listviewX.SubItems[SortColumn].Text, listviewY.SubItems[SortColumn].Text);
+
+            switch (Order)
+            {
+                // Calculate correct return value based on object comparison
+                case SortOrder.Ascending:
+                    // Ascending sort is selected, return normal result of compare operation
+                    return compareResult;
+                case SortOrder.Descending:
+                    // Descending sort is selected, return negative result of compare operation
+                    return (-compareResult);
+                default:
+                    // Return '0' to indicate they are equal
+                    return 0;
+            }
+        }
+    }
+}