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using System;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using Tango.Core;
namespace Tango.SharedUI
{
public abstract class ViewModel : ExtendedObject, INotifyDataErrorInfo
{
private List<KeyValuePair<String, String>> _currentErrors = new List<KeyValuePair<string, string>>();
private bool _hasErrors;
public bool HasErrors
{
get { return _hasErrors; }
set { _hasErrors = value; RaisePropertyChangedAuto(); }
}
public event EventHandler<DataErrorsChangedEventArgs> ErrorsChanged;
public virtual IEnumerable GetErrors(string propertyName)
{
return _currentErrors.Where(x => x.Key == propertyName).Select(x => x.Value).ToList();
}
protected void RaiseError(String propName)
{
ErrorsChanged?.Invoke(this, new DataErrorsChangedEventArgs(propName));
}
protected bool Validate()
{
OnValidating();
HasErrors = false;
_currentErrors.Clear();
foreach (var prop in this.GetType().GetProperties(BindingFlags.Public | BindingFlags.Instance))
{
foreach (var validation in prop.GetCustomAttributes<ValidationAttribute>())
{
if (!validation.IsValid(prop.GetValue(this)))
{
HasErrors = true;
_currentErrors.Add(new KeyValuePair<string, string>(prop.Name, validation.ErrorMessage));
RaiseError(prop.Name);
}
}
}
return !HasErrors;
}
protected virtual void OnValidating()
{
}
}
public abstract class ViewModel<T> : ViewModel where T : IView
{
public T View { get; set; }
public ViewModel(T view)
{
View = view;
View.ViewAttached += (x, e) =>
{
View = (T)e;
OnViewAttached();
};
}
public ViewModel(T view, bool delayed)
{
Task.Factory.StartNew(() =>
{
while (view == null)
{
Thread.Sleep(10);
}
}).ContinueWith((c) =>
{
View = view;
View.ViewAttached += (x, e) =>
{
View = (T)e;
OnViewAttached();
};
});
}
protected virtual void OnViewAttached()
{
}
}
}
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