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ReadOnlyCollectionViewModel.cs
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ReadOnlyCollectionViewModel.cs
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using System;
using System.Linq;
using System.Linq.Expressions;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.ComponentModel.DataAnnotations;
using DevExpress.Mvvm;
using DevExpress.Mvvm.POCO;
using DevExpress.Mvvm.DataAnnotations;
using System.Collections.ObjectModel;
using System.Threading;
using System.Threading.Tasks;
using MVVMExpenses.Common.Utils;
using MVVMExpenses.Common.DataModel;
using MVVMExpenses.DataModels;
namespace MVVMExpenses.Common.ViewModel {
/// <summary>
/// The base class for POCO view models exposing a read-only collection of entities of a given type.
/// This is a partial class that provides the extension point to add custom properties, commands and override methods without modifying the auto-generated code.
/// </summary>
/// <typeparam name="TEntity">An entity type.</typeparam>
/// <typeparam name="TUnitOfWork">A unit of work type.</typeparam>
public partial class ReadOnlyCollectionViewModel<TEntity, TUnitOfWork> : ReadOnlyCollectionViewModel<TEntity, TEntity, TUnitOfWork>
where TEntity : class
where TUnitOfWork : IUnitOfWork {
/// <summary>
/// Creates a new instance of ReadOnlyCollectionViewModel as a POCO view model.
/// </summary>
/// <param name="unitOfWorkFactory">A factory used to create a unit of work instance.</param>
/// <param name="getRepositoryFunc">A function that returns a repository representing entities of the given type.</param>
/// <param name="projection">An optional parameter that provides a LINQ function used to customize a query for entities. The parameter, for example, can be used for sorting data.</param>
public static ReadOnlyCollectionViewModel<TEntity, TUnitOfWork> CreateReadOnlyCollectionViewModel(
IUnitOfWorkFactory<TUnitOfWork> unitOfWorkFactory,
Func<TUnitOfWork, IReadOnlyRepository<TEntity>> getRepositoryFunc,
Func<IRepositoryQuery<TEntity>, IQueryable<TEntity>> projection = null) {
return ViewModelSource.Create(() => new ReadOnlyCollectionViewModel<TEntity, TUnitOfWork>(unitOfWorkFactory, getRepositoryFunc, projection));
}
/// <summary>
/// Initializes a new instance of the ReadOnlyCollectionViewModel class.
/// This constructor is declared protected to avoid an undesired instantiation of the PeekCollectionViewModel type without the POCO proxy factory.
/// </summary>
/// <param name="unitOfWorkFactory">A factory used to create a unit of work instance.</param>
/// <param name="getRepositoryFunc">A function that returns a repository representing entities of the given type.</param>
/// <param name="projection">An optional parameter that provides a LINQ function used to customize a query for entities. The parameter, for example, can be used for sorting data.</param>
protected ReadOnlyCollectionViewModel(
IUnitOfWorkFactory<TUnitOfWork> unitOfWorkFactory,
Func<TUnitOfWork, IReadOnlyRepository<TEntity>> getRepositoryFunc,
Func<IRepositoryQuery<TEntity>, IQueryable<TEntity>> projection = null)
: base(unitOfWorkFactory, getRepositoryFunc, projection) {
}
}
/// <summary>
/// The base class for POCO view models exposing a read-only collection of entities of a given type.
/// This is a partial class that provides the extension point to add custom properties, commands and override methods without modifying the auto-generated code.
/// </summary>
/// <typeparam name="TEntity">A repository entity type.</typeparam>
/// <typeparam name="TProjection">A projection entity type.</typeparam>
/// <typeparam name="TUnitOfWork">A unit of work type.</typeparam>
public partial class ReadOnlyCollectionViewModel<TEntity, TProjection, TUnitOfWork> : ReadOnlyCollectionViewModelBase<TEntity, TProjection, TUnitOfWork>
where TEntity : class
where TProjection : class
where TUnitOfWork : IUnitOfWork {
/// <summary>
/// Creates a new instance of ReadOnlyCollectionViewModel as a POCO view model.
/// </summary>
/// <param name="unitOfWorkFactory">A factory used to create a unit of work instance.</param>
/// <param name="getRepositoryFunc">A function that returns the repository representing entities of a given type.</param>
/// <param name="projection">A LINQ function used to customize a query for entities. The parameter, for example, can be used for sorting data and/or for projecting data to a custom type that does not match the repository entity type.</param>
public static ReadOnlyCollectionViewModel<TEntity, TProjection, TUnitOfWork> CreateReadOnlyProjectionCollectionViewModel(
IUnitOfWorkFactory<TUnitOfWork> unitOfWorkFactory,
Func<TUnitOfWork, IReadOnlyRepository<TEntity>> getRepositoryFunc,
Func<IRepositoryQuery<TEntity>, IQueryable<TProjection>> projection) {
return ViewModelSource.Create(() => new ReadOnlyCollectionViewModel<TEntity, TProjection, TUnitOfWork>(unitOfWorkFactory, getRepositoryFunc, projection));
}
/// <summary>
/// Initializes a new instance of the ReadOnlyCollectionViewModel class.
/// This constructor is declared protected to avoid an undesired instantiation of the PeekCollectionViewModel type without the POCO proxy factory.
/// </summary>
/// <param name="unitOfWorkFactory">A factory used to create a unit of work instance.</param>
/// <param name="getRepositoryFunc">A function that returns the repository representing entities of a given type.</param>
/// <param name="projection">A LINQ function used to customize a query for entities. The parameter, for example, can be used for sorting data and/or for projecting data to a custom type that does not match the repository entity type.</param>
protected ReadOnlyCollectionViewModel(
IUnitOfWorkFactory<TUnitOfWork> unitOfWorkFactory,
Func<TUnitOfWork, IReadOnlyRepository<TEntity>> getRepositoryFunc,
Func<IRepositoryQuery<TEntity>, IQueryable<TProjection>> projection)
: base(unitOfWorkFactory, getRepositoryFunc, projection) {
}
}
/// <summary>
/// The base class for POCO view models exposing a read-only collection of entities of a given type.
/// It is not recommended to inherit directly from this class. Use the ReadOnlyCollectionViewModel class instead.
/// </summary>
/// <typeparam name="TEntity">A repository entity type.</typeparam>
/// <typeparam name="TProjection">A projection entity type.</typeparam>
/// <typeparam name="TUnitOfWork">A unit of work type.</typeparam>
[POCOViewModel]
public abstract class ReadOnlyCollectionViewModelBase<TEntity, TProjection, TUnitOfWork> : EntitiesViewModel<TEntity, TProjection, TUnitOfWork>
where TEntity : class
where TProjection : class
where TUnitOfWork : IUnitOfWork {
/// <summary>
/// Initializes a new instance of the ReadOnlyCollectionViewModelBase class.
/// </summary>
/// <param name="unitOfWorkFactory">A factory used to create a unit of work instance.</param>
/// <param name="getRepositoryFunc">A function that returns the repository representing entities of a given type.</param>
/// <param name="projection">A LINQ function used to customize a query for entities. The parameter, for example, can be used for sorting data and/or for projecting data to a custom type that does not match the repository entity type.</param>
protected ReadOnlyCollectionViewModelBase(
IUnitOfWorkFactory<TUnitOfWork> unitOfWorkFactory,
Func<TUnitOfWork, IReadOnlyRepository<TEntity>> getRepositoryFunc,
Func<IRepositoryQuery<TEntity>, IQueryable<TProjection>> projection
) : base(unitOfWorkFactory, getRepositoryFunc, projection) {
Messenger.Default.Register<CloseAllMessage>(this, x => SaveLayout());
}
/// <summary>
/// The selected enity.
/// Since ReadOnlyCollectionViewModelBase is a POCO view model, this property will raise INotifyPropertyChanged.PropertyEvent when modified so it can be used as a binding source in views.
/// </summary>
public virtual TProjection SelectedEntity { get; set; }
/// <summary>
/// The lambda expression used to filter which entities will be loaded locally from the unit of work.
/// Since ReadOnlyCollectionViewModelBase is a POCO view model, this property will raise INotifyPropertyChanged.PropertyEvent when modified so it can be used as a binding source in views.
/// </summary>
public virtual Expression<Func<TEntity, bool>> FilterExpression { get; set; }
/// <summary>
/// Reloads entities.
/// Since CollectionViewModelBase is a POCO view model, an instance of this class will also expose the RefreshCommand property that can be used as a binding source in views.
/// </summary>
public virtual void Refresh() {
LoadEntities(false);
}
protected ILayoutSerializationService LayoutSerializationService { get { return this.GetService<ILayoutSerializationService>(); } }
protected virtual string ViewName { get { return typeof(TEntity).Name + "ReadonlyCollectionView"; } }
bool isLoaded = false;
[Display(AutoGenerateField = false)]
public virtual void OnLoaded() {
isLoaded = true;
string state = null;
if(LayoutSerializationService != null && ViewModelLogicalLayoutHelper.PersistentViewsLayout.TryGetValue(ViewName, out state)) {
LayoutSerializationService.Deserialize(state);
}
}
[Display(AutoGenerateField = false)]
public virtual void OnUnloaded() {
if(isLoaded) {
SaveLayout();
}
}
void SaveLayout() {
if(LayoutSerializationService != null) {
ViewModelLogicalLayoutHelper.PersistentViewsLayout[ViewName] = LayoutSerializationService.Serialize();
}
}
protected override void OnClose(CancelEventArgs e) {
SaveLayout();
Messenger.Default.Send(new DestroyOrphanedDocumentsMessage());
base.OnClose(e);
}
/// <summary>
/// Determines whether entities can be reloaded.
/// Since CollectionViewModelBase is a POCO view model, this method will be used as a CanExecute callback for RefreshCommand.
/// </summary>
public bool CanRefresh() {
return !IsLoading;
}
protected override void OnEntitiesAssigned(Func<TProjection> getSelectedEntityCallback) {
base.OnEntitiesAssigned(getSelectedEntityCallback);
SelectedEntity = getSelectedEntityCallback() ?? Entities.FirstOrDefault();
}
protected override Func<TProjection> GetSelectedEntityCallback() {
int selectedItemIndex = Entities.IndexOf(SelectedEntity);
return () => (selectedItemIndex >= 0 && selectedItemIndex < Entities.Count) ? Entities[selectedItemIndex] : null;
}
protected override void OnIsLoadingChanged() {
base.OnIsLoadingChanged();
this.RaiseCanExecuteChanged(x => x.Refresh());
}
protected virtual void OnSelectedEntityChanged() { }
protected virtual void OnFilterExpressionChanged() {
if(IsLoaded || IsLoading)
LoadEntities(true);
}
protected override Expression<Func<TEntity, bool>> GetFilterExpression() {
return FilterExpression;
}
}
}