Renamed project to GUI

GUI/PasswordListBox.cs

@@ -0,0 +1,73 @@
+using System.Collections;
+
+namespace Password_Manager
+{
+    public delegate string SearchQuery();
+    public class PasswordListBox : ListBox
+    {
+        public event DataRequest? PathRequest;
+        public event SearchQuery? SearchQueryRequest;
+
+        public PasswordListBox(DataRequest PathRequest, SearchQuery? SearchQueryRequest = null) : base()
+        {
+            this.PathRequest = PathRequest;
+            this.SearchQueryRequest = SearchQueryRequest;
+        }
+
+        public PasswordListBox() : base() { }
+        /*do not instantiate this class using this constructor if you want to use the ReloadResults method afterwards.
+         Use this so that the MainForm.Designer.cs file doesn't have a stroke due to Event References, then re-instantiate the object
+         afterwards using the other constructor*/
+
+        public void ReloadResults(object? sender = null, EventArgs? arg = null)
+        {
+            DirectoryInfo d;
+            FileInfo[] files = new FileInfo[0];
+            try
+            {
+                if (PathRequest != null)
+                {
+                    d = new DirectoryInfo(PathRequest());
+                }
+                else
+                {
+                    throw new InvalidOperationException("You cannot use the ReloadResults method if you instantiated the object using the parameterless constructor");
+                }
+                files = d.GetFiles("*.gpg");
+            }
+            catch (ArgumentNullException e)
+            {
+                MessageBox.Show(e.ToString(), "Error: Invalid path", MessageBoxButtons.OK, MessageBoxIcon.Error);
+            }
+
+            List<string> elements = new List<string>();
+            for (int i = 0; i < files.Length; i++)
+            {
+                elements.Add(files[i].Name);
+            }
+
+            string[] copy = elements.ToArray();
+
+            string? searchQuery = SearchQueryRequest?.Invoke();
+            if (searchQuery != null) //we have a search query
+            {
+                foreach (string s in copy)
+                {
+                    if (!s.Contains(searchQuery))
+                    {
+                        elements.Remove(s);
+                    }
+                }
+            }
+
+            this.DataSource = elements;
+            try
+            {
+                SelectedIndex = 0;
+            } catch (ArgumentOutOfRangeException)
+            {
+                SelectedIndex = -1;
+            }
+        }
+    }
+}