namespace OECS;

/// <summary>
/// The kind of change that occurred in the ECS world.
/// </summary>
public enum ChangeKind
{
    /// <summary>
    /// A new entity was created.
    /// </summary>
    EntityAdded,

    /// <summary>
    /// An entity was destroyed.
    /// </summary>
    EntityRemoved,

    /// <summary>
    /// A component was added to an entity.
    /// </summary>
    ComponentAdded,

    /// <summary>
    /// A component was removed from an entity.
    /// </summary>
    ComponentRemoved,

    /// <summary>
    /// A component's value was modified. Must be explicitly marked
    /// via <see cref="World.MarkModified{T}"/>.
    /// </summary>
    ComponentModified,

    /// <summary>
    /// The source set for a relationship type on a target entity was
    /// reordered. The <see cref="EntityChange.Entity"/> is the target
    /// and <see cref="EntityChange.ComponentType"/> is the relationship type.
    /// </summary>
    RelationshipReordered
}