FeedCenter/Application/Options/OptionsWindow.xaml.cs

using System.Collections.Generic;
using System.Windows.Controls;

namespace FeedCenter.Options
{
    public partial class OptionsWindow
    {
        private readonly List<OptionsPanelBase> _optionPanels = new();

        public OptionsWindow()
        {
            InitializeComponent();

            // Add all the option categories
            AddCategories();

            // Load the category list
            LoadCategories();
        }

        private void AddCategories()
        {
            _optionPanels.Add(new GeneralOptionsPanel(this));
            _optionPanels.Add(new DisplayOptionsPanel(this));
            _optionPanels.Add(new FeedsOptionsPanel(this));
            _optionPanels.Add(new UpdateOptionsPanel(this));
            _optionPanels.Add(new AboutOptionsPanel(this));
        }

        private void LoadCategories()
        {
            // Loop over each panel
            foreach (var optionsPanel in _optionPanels)
            {
                // Tell the panel to load itself
                optionsPanel.LoadPanel();

                // Add the panel to the category ist
                CategoryListBox.Items.Add(new CategoryListItem(optionsPanel));

                // Set the panel into the right side
                ContentControl.Content = optionsPanel;
            }

            // Select the first item
            CategoryListBox.SelectedItem = CategoryListBox.Items[0];
        }

        private void SelectCategory(OptionsPanelBase panel)
        {
            // Set the content
            ContentControl.Content = panel;
        }

        private void HandleSelectedCategoryChanged(object sender, SelectionChangedEventArgs e)
        {
            // Select the right category
            SelectCategory(((CategoryListItem) CategoryListBox.SelectedItem).Panel);
        }

        private class CategoryListItem
        {
            public CategoryListItem(OptionsPanelBase panel)
            {
                Panel = panel;
            }

            public OptionsPanelBase Panel { get; }

            public override string ToString()
            {
                return Panel.CategoryName;
            }
        }
    }
}