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Add completed solution for chapter 3

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Alvin Ashcraft
2023-05-13 12:29:36 -04:00
parent e29c389e86
commit 5ec4e6e6b4
25 changed files with 861 additions and 0 deletions
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Chapter03/Complete/MyMediaCollection/ViewModels/BindableBase.cs
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using System.ComponentModel;
using System.Runtime.CompilerServices;
namespace MyMediaCollection.ViewModels
{
public class BindableBase : INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged;
protected void OnPropertyChanged([CallerMemberName] string propertyName = null)
{
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
protected bool SetProperty<T>(ref T originalValue, T newValue, [CallerMemberName] string propertyName = null)
{
if (Equals(originalValue, newValue))
{
return false;
}
originalValue = newValue;
OnPropertyChanged(propertyName);
return true;
}
}
}
Chapter03/Complete/MyMediaCollection/ViewModels/MainViewModel.cs
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using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Input;
using MyMediaCollection.Enums;
using MyMediaCollection.Model;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Windows.Input;
namespace MyMediaCollection.ViewModels
{
public partial class MainViewModel : ObservableObject
{
[ObservableProperty]
private string selectedMedium;
[ObservableProperty]
private ObservableCollection<MediaItem> items;
[ObservableProperty]
private IList<string> mediums;
[ObservableProperty]
[NotifyCanExecuteChangedFor(nameof(DeleteCommand))]
private MediaItem selectedMediaItem;
private ObservableCollection<MediaItem> allItems;
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];
}
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]
public void AddEdit()
{
// 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}"
};
allItems.Add(newItem);
Items.Add(newItem);
additionalItemCount++;
}
[RelayCommand(CanExecute = nameof(CanDeleteItem))]
public void Delete()
{
allItems.Remove(SelectedMediaItem);
Items.Remove(SelectedMediaItem);
}
private bool CanDeleteItem() => SelectedMediaItem != null;
}
}
Chapter03/Complete/MyMediaCollection/ViewModels/MainViewModel.txt
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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);
}
}
}
Chapter03/Complete/MyMediaCollection/ViewModels/MainViewModel2.txt
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using MyMediaCollection.Enums;
using MyMediaCollection.Model;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Windows.Input;
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();
DeleteCommand = new RelayCommand(DeleteItem, CanDeleteItem);
// No CanExecute param is needed for this command
// because you can always add or edit items.
AddEditCommand = new RelayCommand(AddOrEditItem);
}
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);
((RelayCommand)DeleteCommand).RaiseCanExecuteChanged();
}
}
public ICommand AddEditCommand { get; set; }
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}"
};
allItems.Add(newItem);
Items.Add(newItem);
additionalItemCount++;
}
public ICommand DeleteCommand { get; set; }
public void DeleteItem()
{
allItems.Remove(SelectedMediaItem);
Items.Remove(SelectedMediaItem);
}
private bool CanDeleteItem() => selectedMediaItem != null;
}
}
Chapter03/Complete/MyMediaCollection/ViewModels/RelayCommand.cs
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using System;
using System.Windows.Input;
namespace MyMediaCollection.ViewModels
{
public class RelayCommand : ICommand
{
private readonly Action action;
private readonly Func<bool> canExecute;
public RelayCommand(Action action)
: this(action, null)
{
}
public RelayCommand(Action action, Func<bool> canExecute)
{
if (action == null)
throw new ArgumentNullException(nameof(action));
this.action = action;
this.canExecute = canExecute;
}
public bool CanExecute(object parameter) => canExecute == null || canExecute();
public void Execute(object parameter) => action();
public event EventHandler CanExecuteChanged;
public void RaiseCanExecuteChanged() => CanExecuteChanged?.Invoke(this, EventArgs.Empty);
}
}