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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq.Expressions;
using System.Reflection;
using System.Runtime.CompilerServices;
using System.Threading.Tasks;
using Xamarin.Forms;
namespace App.Common.Core.ViewModels
{
public class BaseViewModel : INotifyPropertyChanged
{
bool isBusy = false;
public bool IsBusy
{
get { return isBusy; }
set { SetProperty(ref isBusy, value); }
}
string title = string.Empty;
public string Title
{
get { return title; }
set { SetProperty(ref title, value); }
}
protected bool SetProperty<T>(ref T backingStore, T value,
[CallerMemberName]string propertyName = "",
Action onChanged = null)
{
if (EqualityComparer<T>.Default.Equals(backingStore, value))
return false;
backingStore = value;
onChanged?.Invoke();
OnPropertyChanged(propertyName);
return true;
}
#region INotifyPropertyChanged
public event PropertyChangedEventHandler PropertyChanged;
protected void OnPropertyChanged([CallerMemberName] string propertyName = "")
{
var changed = PropertyChanged;
if (changed == null)
return;
changed.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
#endregion
protected void RaisePropertyChanged([CallerMemberName] string propertyName = "")
{
this.OnPropertyChanged(propertyName);
}
public void RaisePropertyChanged<T>(Expression<Func<T>> property)
{
var name = GetMemberInfo(property).Name;
OnPropertyChanged(name);
}
private MemberInfo GetMemberInfo(Expression expression)
{
MemberExpression operand;
LambdaExpression lambdaExpression = (LambdaExpression)expression;
if (lambdaExpression.Body as UnaryExpression != null)
{
UnaryExpression body = (UnaryExpression)lambdaExpression.Body;
operand = (MemberExpression)body.Operand;
}
else
{
operand = (MemberExpression)lambdaExpression.Body;
}
return operand.Member;
}
public virtual Task InitAsync(object parameter)
{
return Task.FromResult(true);
}
}
}
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