modernkeepass/ModernKeePass/ViewModels/SettingsVm.cs

using System.Collections.ObjectModel;
using System.Linq;
using Windows.UI.Xaml.Controls;
using ModernKeePass.Common;
using ModernKeePass.Interfaces;
using ModernKeePass.Pages;

namespace ModernKeePass.ViewModels
{
    public class SettingsVm : NotifyPropertyChangedBase, IHasSelectableObject
    {
        private ListMenuItemVm _selectedItem;

        //public ObservableCollection<ListMenuItemVm> MenuItems { get; set; }
        private IOrderedEnumerable<IGrouping<string, ListMenuItemVm>> _menuItems;

        public IOrderedEnumerable<IGrouping<string, ListMenuItemVm>> MenuItems
        {
            get { return _menuItems; }
            set { SetProperty(ref _menuItems, value); }
        }

        public ISelectableModel SelectedItem
        {
            get { return _selectedItem; }
            set
            {
                if (_selectedItem == value) return;
                if (_selectedItem != null)
                {
                    _selectedItem.IsSelected = false;
                }

                SetProperty(ref _selectedItem, (ListMenuItemVm)value);

                if (_selectedItem != null)
                {
                    _selectedItem.IsSelected = true;
                }
            }
        }

        public SettingsVm()
        {
            var menuItems = new ObservableCollection<ListMenuItemVm>
            {
                new ListMenuItemVm { Title = "General", Group = "Database", SymbolIcon = Symbol.Setting, PageType = typeof(SettingsDatabasePage), IsSelected = true },
                new ListMenuItemVm { Title = "Security", Group = "Database", SymbolIcon = Symbol.Permissions, PageType = typeof(SettingsSecurityPage) },
                //new ListMenuItemVm { Title = "General", SymbolIcon = Symbol.Edit, PageType = typeof(SettingsGeneralPage) }
            };
            SelectedItem = menuItems.FirstOrDefault(m => m.IsSelected);

            MenuItems = from item in menuItems group item by item.Group into grp orderby grp.Key select grp;
        }
    }
}