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using System;
using System.Diagnostics;
using System.Linq.Expressions;
using System.Reflection;
namespace MonoGame.Extended.Tweening
{
public sealed class TweenPropertyMember<T> : TweenMember<T>
where T : struct
{
private readonly PropertyInfo _propertyInfo;
public TweenPropertyMember(object target, PropertyInfo propertyInfo)
: base(target, CompileGetMethod(propertyInfo), CompileSetMethod(propertyInfo))
{
_propertyInfo = propertyInfo;
}
public override Type Type => _propertyInfo.PropertyType;
public override string Name => _propertyInfo.Name;
private static Func<object, object> CompileGetMethod(PropertyInfo propertyInfo)
{
var param = Expression.Parameter(typeof(object));
var instance = Expression.Convert(param, propertyInfo.DeclaringType);
var convert = Expression.TypeAs(Expression.Property(instance, propertyInfo), typeof(object));
return Expression.Lambda<Func<object, object>>(convert, param).Compile();
}
private static Action<object, object> CompileSetMethod(PropertyInfo propertyInfo)
{
Debug.Assert(propertyInfo.DeclaringType != null);
var param = Expression.Parameter(typeof(object));
var argument = Expression.Parameter(typeof(object));
var expression = Expression.Convert(param, propertyInfo.DeclaringType);
var methodInfo = propertyInfo.SetMethod;
var arguments = Expression.Convert(argument, propertyInfo.PropertyType);
var setterCall = Expression.Call(expression, methodInfo, arguments);
return Expression.Lambda<Action<object, object>>(setterCall, param, argument).Compile();
}
}
}
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