Add chapter 4 completed solution

2026-06-20 12:23:09 +00:00 · 2023-06-03 13:59:12 -04:00
parent e512a9926c
commit edbc96830c
30 changed files with 1077 additions and 0 deletions
@@ -0,0 +1,100 @@
+using CommunityToolkit.Mvvm.ComponentModel;
+using CommunityToolkit.Mvvm.Input;
+using Microsoft.UI.Xaml.Input;
+using MyMediaCollection.Interfaces;
+using MyMediaCollection.Model;
+using System.Collections.ObjectModel;
+
+namespace MyMediaCollection.ViewModels
+{
+    public partial class MainViewModel : ObservableObject
+    {
+        [ObservableProperty]
+        private string selectedMedium;
+        [ObservableProperty]
+        private ObservableCollection<MediaItem> items = new ObservableCollection<MediaItem>();
+        private ObservableCollection<MediaItem> allItems;
+        [ObservableProperty]
+        private ObservableCollection<string> mediums;
+        [ObservableProperty]
+        [NotifyCanExecuteChangedFor(nameof(DeleteCommand))]
+        private MediaItem selectedMediaItem;
+        private INavigationService _navigationService;
+        private IDataService _dataService;
+        private const string AllMediums = "All";
+
+        public MainViewModel(INavigationService navigationService, IDataService dataService)
+        {
+            _navigationService = navigationService;
+            _dataService = dataService;
+
+            PopulateData();
+        }
+
+        public void PopulateData()
+        {
+            Items.Clear();
+
+            foreach (var item in _dataService.GetItems())
+            {
+                Items.Add(item);
+            }
+
+            allItems = new ObservableCollection<MediaItem>(Items);
+
+            Mediums = new ObservableCollection<string>
+            {
+                AllMediums
+            };
+
+            foreach (var itemType in _dataService.GetItemTypes())
+            {
+                Mediums.Add(itemType.ToString());
+            }
+
+            SelectedMedium = Mediums[0];
+        }
+
+        partial void OnSelectedMediumChanged(string value)
+        {
+            Items.Clear();
+
+            foreach (var item in allItems)
+            {
+                if (string.IsNullOrWhiteSpace(value)
+                    || value == "All"
+                    || value == item.MediaType.ToString())
+                {
+                    Items.Add(item);
+                }
+            }
+        }
+
+        [RelayCommand]
+        private void AddEdit()
+        {
+            var selectedItemId = -1;
+
+            if (SelectedMediaItem != null)
+            {
+                selectedItemId = SelectedMediaItem.Id;
+            }
+
+            _navigationService.NavigateTo("ItemDetailsPage", selectedItemId);
+        }
+
+        public void ListViewDoubleTapped(object sender, DoubleTappedRoutedEventArgs e)
+        {
+            AddEdit();
+        }
+
+        [RelayCommand(CanExecute = nameof(CanDeleteItem))]
+        private void Delete()
+        {
+            allItems.Remove(SelectedMediaItem);
+            Items.Remove(SelectedMediaItem);
+        }
+
+        private bool CanDeleteItem() => SelectedMediaItem != null;
+    }
+}