Add completed solution for chapter 3

2026-06-20 12:23:09 +00:00 · 2023-05-13 12:29:36 -04:00
parent e29c389e86
commit 5ec4e6e6b4
25 changed files with 861 additions and 0 deletions
@@ -0,0 +1,148 @@
+using MyMediaCollection.Enums;
+using MyMediaCollection.Model;
+using System.Collections.Generic;
+
+namespace MyMediaCollection.ViewModels
+{
+    public class MainViewModel : BindableBase
+    {
+        private string selectedMedium;
+        private ObservableCollection<MediaItem> items;
+        private ObservableCollection<MediaItem> allItems;
+        private IList<string> mediums;
+        private MediaItem selectedMediaItem;
+        private int additionalItemCount = 1;
+
+        public MainViewModel()
+        {
+            PopulateData();
+        }
+
+        public void PopulateData()
+        {
+            var cd = new MediaItem
+            {
+                Id = 1,
+                Name = "Classical Favorites",
+                MediaType = ItemType.Music,
+                MediumInfo = new Medium { Id = 1, MediaType = ItemType.Music, Name = "CD" }
+            };
+
+            var book = new MediaItem
+            {
+                Id = 2,
+                Name = "Classic Fairy Tales",
+                MediaType = ItemType.Book,
+                MediumInfo = new Medium { Id = 2, MediaType = ItemType.Book, Name = "Book" }
+            };
+
+            var bluRay = new MediaItem
+            {
+                Id = 3,
+                Name = "The Mummy",
+                MediaType = ItemType.Video,
+                MediumInfo = new Medium { Id = 3, MediaType = ItemType.Video, Name = "Blu Ray" }
+            };
+
+            items = new ObservableCollection<MediaItem>
+            {
+                cd,
+                book,
+                bluRay
+            };
+
+            allItems = new ObservableCollection<MediaItem>(Items);
+
+            mediums = new List<string>
+            {
+                "All",
+                nameof(ItemType.Book),
+                nameof(ItemType.Music),
+                nameof(ItemType.Video)
+            };
+
+            selectedMedium = Mediums[0];
+        }
+
+        public ObservableCollection<MediaItem> Items
+        {
+            get
+            {
+                return items;
+            }
+            set
+            {
+                SetProperty(ref items, value);
+            }
+        }
+
+        public IList<string> Mediums
+        {
+            get
+            {
+                return mediums;
+            }
+            set
+            {
+                SetProperty(ref mediums, value);
+            }
+        }
+
+        public string SelectedMedium
+        {
+            get 
+            {
+                return selectedMedium;
+            }
+            set
+            {
+                SetProperty(ref selectedMedium, value);
+
+                Items.Clear();
+
+                foreach (var item in allItems)
+                {
+                    if (string.IsNullOrWhiteSpace(selectedMedium) ||
+                        selectedMedium == "All" ||
+                        selectedMedium == item.MediaType.ToString())
+                    {
+                        Items.Add(item);
+                    }
+                }
+            }
+        }
+
+        public MediaItem SelectedMediaItem
+        {
+            get => selectedMediaItem;
+            set
+            {
+                SetProperty(ref selectedMediaItem, value);
+            }
+        }
+
+        public void AddOrEditItem()
+        {
+            // Note this is temporary until
+            // we use a real data source for items.
+            const int startingItemCount = 3;
+
+            var newItem = new MediaItem
+            {
+                Id = startingItemCount + additionalItemCount,
+                Location = LocationType.InCollection,
+                MediaType = ItemType.Music,
+                MediumInfo = new Medium { Id = 1, MediaType = ItemType.Music, Name = "CD" },
+                Name = $"CD {additionalItemCount}"
+            };
+
+            Items.Add(newItem);
+            additionalItemCount++;
+        }
+
+        public void DeleteItem()
+        {
+            Items.Remove(SelectedMediaItem);
+        }
+    }
+}