Add sample code for chapter 5

2026-06-20 12:23:09 +00:00 · 2023-06-10 09:00:29 -04:00
parent edbc96830c
commit 370d8a52b8
60 changed files with 2202 additions and 0 deletions
@@ -0,0 +1,154 @@
+using CommunityToolkit.Mvvm.ComponentModel;
+using CommunityToolkit.Mvvm.Input;
+using MyMediaCollection.Enums;
+using MyMediaCollection.Interfaces;
+using MyMediaCollection.Model;
+using System;
+using System.Collections.ObjectModel;
+using System.Linq;
+
+namespace MyMediaCollection.ViewModels
+{
+    public partial class ItemDetailsViewModel : ObservableObject
+    {
+        [ObservableProperty]
+        private ObservableCollection<string> locationTypes = new();
+        [ObservableProperty]
+        private ObservableCollection<string> mediums = new();
+        [ObservableProperty]
+        private ObservableCollection<string> itemTypes = new();
+        private int _itemId;
+        [ObservableProperty]
+        private string itemName;
+        [ObservableProperty]
+        private string selectedMedium;
+        [ObservableProperty]
+        private string selectedItemType;
+        [ObservableProperty]
+        private string selectedLocation;
+
+        [ObservableProperty]
+        [NotifyCanExecuteChangedFor(nameof(SaveCommand))]
+        private bool isDirty;
+        private int _selectedItemId = -1;
+        protected INavigationService _navigationService;
+        protected IDataService _dataService;
+
+        public ItemDetailsViewModel(INavigationService navigationService, IDataService dataService)
+        {
+            _navigationService = navigationService;
+            _dataService = dataService;
+
+            PopulateLists();
+        }
+
+        public void InitializeItemDetailData(int itemId)
+        {
+            _selectedItemId = itemId;
+
+            PopulateExistingItem(_dataService);
+            IsDirty = false;
+        }
+
+        private void PopulateExistingItem(IDataService dataService)
+        {
+            if (_selectedItemId > 0)
+            {
+                var item = _dataService.GetItem(_selectedItemId);
+                Mediums.Clear();
+
+                foreach (string medium in dataService.GetMediums(item.MediaType).Select(m => m.Name))
+                    Mediums.Add(medium);
+
+                _itemId = item.Id;
+                ItemName = item.Name;
+                SelectedMedium = item.MediumInfo.Name;
+                SelectedLocation = item.Location.ToString();
+                SelectedItemType = item.MediaType.ToString();
+            }
+        }
+
+        private void PopulateLists()
+        {
+            ItemTypes.Clear();
+            foreach (string iType in Enum.GetNames(typeof(ItemType)))
+                ItemTypes.Add(iType);
+
+            LocationTypes.Clear();
+            foreach (string lType in Enum.GetNames(typeof(LocationType)))
+                LocationTypes.Add(lType);
+
+            Mediums = new ObservableCollection<string>();
+        }
+
+        [RelayCommand(CanExecute = nameof(CanSaveItem))]
+        private void Save()
+        {
+            MediaItem item;
+
+            if (_itemId > 0)
+            {
+                item = _dataService.GetItem(_itemId);
+
+                item.Name = ItemName;
+                item.Location = (LocationType)Enum.Parse(typeof(LocationType), SelectedLocation);
+                item.MediaType = (ItemType)Enum.Parse(typeof(ItemType), SelectedItemType);
+                item.MediumInfo = _dataService.GetMedium(SelectedMedium);
+
+                _dataService.UpdateItem(item);
+            }
+            else
+            {
+                item = new MediaItem
+                {
+                    Name = ItemName,
+                    Location = (LocationType)Enum.Parse(typeof(LocationType), SelectedLocation),
+                    MediaType = (ItemType)Enum.Parse(typeof(ItemType), SelectedItemType),
+                    MediumInfo = _dataService.GetMedium(SelectedMedium)
+                };
+
+                _dataService.AddItem(item);
+            }
+
+            _navigationService.GoBack();
+        }
+
+        private bool CanSaveItem()
+        {
+            return IsDirty;
+        }
+
+        partial void OnItemNameChanged(string value)
+        {
+            IsDirty = true;
+        }
+
+        partial void OnSelectedMediumChanged(string value)
+        {
+            IsDirty = true;
+        }
+
+        partial void OnSelectedItemTypeChanged(string value)
+        {
+            IsDirty = true;
+            Mediums.Clear();
+
+            if (!string.IsNullOrWhiteSpace(value))
+            {
+                foreach (string med in _dataService.GetMediums((ItemType)Enum.Parse(typeof(ItemType), SelectedItemType)).Select(m => m.Name))
+                    Mediums.Add(med);
+            }
+        }
+
+        partial void OnSelectedLocationChanged(string value)
+        {
+            IsDirty = true;
+        }
+
+        [RelayCommand]
+        private void Cancel()
+        {
+            _navigationService.GoBack();
+        }
+    }
+}