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using System;
using System.Diagnostics;
using System.Linq.Expressions;
using System.Reflection;
namespace MonoGame.Extended.Tweening
{
public sealed class TweenFieldMember<T> : TweenMember<T>
where T : struct
{
private readonly FieldInfo _fieldInfo;
public TweenFieldMember(object target, FieldInfo fieldInfo)
: base(target, CompileGetMethod(fieldInfo), CompileSetMethod(fieldInfo))
{
_fieldInfo = fieldInfo;
}
private static Func<object, object> CompileGetMethod(FieldInfo fieldInfo)
{
var self = Expression.Parameter(typeof(object));
var instance = Expression.Convert(self, fieldInfo.DeclaringType);
var field = Expression.Field(instance, fieldInfo);
var convert = Expression.TypeAs(field, typeof(object));
return Expression.Lambda<Func<object, object>>(convert, self).Compile();
}
private static Action<object, object> CompileSetMethod(FieldInfo fieldInfo)
{
Debug.Assert(fieldInfo.DeclaringType != null);
var self = Expression.Parameter(typeof(object));
var value = Expression.Parameter(typeof(object));
var fieldExp = Expression.Field(Expression.Convert(self, fieldInfo.DeclaringType), fieldInfo);
var assignExp = Expression.Assign(fieldExp, Expression.Convert(value, fieldInfo.FieldType));
return Expression.Lambda<Action<object, object>>(assignExp, self, value).Compile();
}
public override Type Type => _fieldInfo.FieldType;
public override string Name => _fieldInfo.Name;
}
}
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