StarSim

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ReadUsersViewModel.cs (4661B)

      1 using DynamicData.Binding;
      2 
      3 using Microsoft.EntityFrameworkCore;
      4 
      5 using ReactiveUI;
      6 
      7 using StarSimLib.Contexts;
      8 using StarSimLib.Models;
      9 
     10 namespace StarSimGui.ViewModels.Database_ViewModels
     11 {
     12     /// <summary>
     13     /// Represents the read users view.
     14     /// </summary>
     15     public class ReadUsersViewModel : ViewModelBase
     16     {
     17         /// <summary>
     18         /// The program database.
     19         /// </summary>
     20         private readonly SimulatorContext dbContext;
     21 
     22         /// <summary>
     23         /// Backing field for the <see cref="PublishedSystems"/> property.
     24         /// </summary>
     25         private IObservableCollection<PublishedSystem> publishedSystemsObservable;
     26 
     27         /// <summary>
     28         /// Backing field for the <see cref="Users"/> property.
     29         /// </summary>
     30         private IObservableCollection<User> usersObservable;
     31 
     32         /// <summary>
     33         /// Backing field for the <see cref="SelectedPublishedSystem"/> property.
     34         /// </summary>
     35         public PublishedSystem selectedPublishedSystem;
     36 
     37         /// <summary>
     38         /// Backing field for the <see cref="SelectedUser"/> property.
     39         /// </summary>
     40         public User selectedUser;
     41 
     42         /// <summary>
     43         /// Initialises a new instance of the <see cref="ReadUsersViewModel"/> class.
     44         /// </summary>
     45         public ReadUsersViewModel()
     46         {
     47             publishedSystemsObservable = new ObservableCollectionExtended<PublishedSystem>();
     48 
     49             usersObservable = new ObservableCollectionExtended<User>();
     50         }
     51 
     52         /// <summary>
     53         /// Initialises a new instance of the <see cref="ReadUsersViewModel"/> class.
     54         /// </summary>
     55         /// <param name="context">The <see cref="SimulatorContext"/> instance in which program data is stored.</param>
     56         public ReadUsersViewModel(in SimulatorContext context) : this()
     57         {
     58             dbContext = context;
     59 
     60             PublishedSystems.Load(dbContext.PublishedSystems.Include(system => system.System));
     61 
     62             Users.Load(dbContext.Users.Include(user => user.PublishedSystems).ThenInclude(system => system.System));
     63         }
     64 
     65         /// <summary>
     66         /// Whether the currently selected published system is null.
     67         /// </summary>
     68         public bool IsSelectedPublishedSystemNull
     69         {
     70             get { return SelectedPublishedSystem == null; }
     71         }
     72 
     73         /// <summary>
     74         /// Whether the currently selected user is null.
     75         /// </summary>
     76         public bool IsSelectedUserNull
     77         {
     78             get { return SelectedUser == null; }
     79         }
     80 
     81         /// <summary>
     82         /// The published systems held in the database.
     83         /// </summary>
     84         public IObservableCollection<PublishedSystem> PublishedSystems
     85         {
     86             get
     87             {
     88                 return publishedSystemsObservable;
     89             }
     90             set
     91             {
     92                 publishedSystemsObservable = value;
     93                 this.RaisePropertyChanged();
     94             }
     95         }
     96 
     97         /// <summary>
     98         /// The currently selected published system from the <see cref="PublishedSystems"/> collection.
     99         /// </summary>
    100         public PublishedSystem SelectedPublishedSystem
    101         {
    102             get
    103             {
    104                 return selectedPublishedSystem;
    105             }
    106             set
    107             {
    108                 selectedPublishedSystem = value;
    109                 this.RaisePropertyChanged();
    110 
    111                 this.RaisePropertyChanged(nameof(IsSelectedPublishedSystemNull));
    112             }
    113         }
    114 
    115         /// <summary>
    116         /// The currently selected user from the <see cref="Users"/> collection.
    117         /// </summary>
    118         public User SelectedUser
    119         {
    120             get
    121             {
    122                 return selectedUser;
    123             }
    124             set
    125             {
    126                 selectedUser = value;
    127                 this.RaisePropertyChanged();
    128 
    129                 this.RaisePropertyChanged(nameof(IsSelectedUserNull));
    130             }
    131         }
    132 
    133         /// <summary>
    134         /// The users held in the database.
    135         /// </summary>
    136         public IObservableCollection<User> Users
    137         {
    138             get
    139             {
    140                 return usersObservable;
    141             }
    142             set
    143             {
    144                 usersObservable = value;
    145                 this.RaisePropertyChanged();
    146             }
    147         }
    148 
    149         /// <summary>
    150         /// Refreshed the database sources for this view model.
    151         /// </summary>
    152         internal void HandleDatabaseRefresh()
    153         {
    154             PublishedSystems.Load(dbContext.PublishedSystems);
    155             Users.Load(dbContext.Users);
    156         }
    157     }
    158 }