Add template project

Template/SettingsWindow/ItemsSettingsPanel.xaml.cs

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+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+using System.Windows.Input;
+
+namespace Template.SettingsWindow;
+
+public partial class ItemsSettingsPanel
+{
+    private CollectionViewSource _collectionViewSource;
+
+    public ItemsSettingsPanel()
+    {
+        InitializeComponent();
+    }
+
+    public override string CategoryName => Properties.Resources.optionCategoryItems;
+
+    public override void LoadPanel(Window parentWindow)
+    {
+        base.LoadPanel(parentWindow);
+
+        if (_collectionViewSource == null)
+        {
+            _collectionViewSource = new CollectionViewSource { Source = Data.ItemEntries };
+
+            ItemDataGrid.ItemsSource = _collectionViewSource.View;
+        }
+
+        _collectionViewSource.View.Refresh();
+
+        if (ItemDataGrid.Items.Count > 0)
+            ItemDataGrid.SelectedIndex = 0;
+
+        SetItemButtonStates();
+    }
+
+    private void HandleItemDataGridSelectionChanged(object sender, SelectionChangedEventArgs e)
+    {
+        SetItemButtonStates();
+    }
+
+    private void SetItemButtonStates()
+    {
+        AddItemButton.IsEnabled = true;
+        EditItemButton.IsEnabled = ItemDataGrid.SelectedItems.Count == 1;
+        DeleteItemButton.IsEnabled = ItemDataGrid.SelectedItems.Count > 0;
+    }
+
+    private void HandleAddItemButtonClick(object sender, RoutedEventArgs e)
+    {
+        AddItem();
+    }
+
+    private void HandleEditItemButtonClick(object sender, RoutedEventArgs e)
+    {
+        EditSelectedItem();
+    }
+
+    private void HandleDeleteItemButtonClick(object sender, RoutedEventArgs e)
+    {
+        DeleteSelectedItems();
+    }
+
+    private void HandleItemDataGridRowMouseDoubleClick(object sender, MouseButtonEventArgs e)
+    {
+        EditSelectedItem();
+    }
+
+    private void AddItem()
+    {
+        var itemEntry = new ItemEntry { };
+
+        var itemWindow = new ItemWindow();
+
+        var result = itemWindow.Display(itemEntry, Window.GetWindow(this));
+
+        if (!result.HasValue || !result.Value)
+            return;
+
+        ItemDataGrid.SelectedItem = itemEntry;
+
+        SetItemButtonStates();
+    }
+
+    private void EditSelectedItem()
+    {
+        if (ItemDataGrid.SelectedItem == null)
+            return;
+
+        var itemEntry = (ItemEntry)ItemDataGrid.SelectedItem;
+
+        var itemWindow = new ItemWindow();
+
+        itemWindow.Display(itemEntry, Window.GetWindow(this));
+    }
+
+    private void DeleteSelectedItems()
+    {
+        if (MessageBox.Show(ParentWindow!, Properties.Resources.ConfirmDeleteItemss, Properties.Resources.ConfirmDeleteTitle, MessageBoxButton.YesNo, MessageBoxImage.Question, MessageBoxResult.No) == MessageBoxResult.No)
+            return;
+
+        var selectedItems = new ItemEntry[ItemDataGrid.SelectedItems.Count];
+
+        ItemDataGrid.SelectedItems.CopyTo(selectedItems, 0);
+
+        foreach (var itemEntry in selectedItems)
+            Data.ItemEntries.Remove(itemEntry);
+
+        SetItemButtonStates();
+    }
+}