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using System;
using System.Linq.Expressions;
using UnityEditor;
namespace Cinemachine.Editor
{
public static class SerializedPropertyHelper
{
/// This is a way to get a field name string in such a manner that the compiler will
/// generate errors for invalid fields. Much better than directly using strings.
/// Usage: instead of
/// <example>
/// "m_MyField";
/// </example>
/// do this:
/// <example>
/// MyClass myclass = null;
/// SerializedPropertyHelper.PropertyName( () => myClass.m_MyField);
/// </example>
public static string PropertyName(Expression<Func<object>> exp)
{
var body = exp.Body as MemberExpression;
if (body == null)
{
var ubody = (UnaryExpression)exp.Body;
body = ubody.Operand as MemberExpression;
}
return body.Member.Name;
}
/// Usage: instead of
/// <example>
/// mySerializedObject.FindProperty("m_MyField");
/// </example>
/// do this:
/// <example>
/// MyClass myclass = null;
/// mySerializedObject.FindProperty( () => myClass.m_MyField);
/// </example>
public static SerializedProperty FindProperty(this SerializedObject obj, Expression<Func<object>> exp)
{
return obj.FindProperty(PropertyName(exp));
}
/// Usage: instead of
/// <example>
/// mySerializedProperty.FindPropertyRelative("m_MyField");
/// </example>
/// do this:
/// <example>
/// MyClass myclass = null;
/// mySerializedProperty.FindPropertyRelative( () => myClass.m_MyField);
/// </example>
public static SerializedProperty FindPropertyRelative(this SerializedProperty obj, Expression<Func<object>> exp)
{
return obj.FindPropertyRelative(PropertyName(exp));
}
}
}