public static void UndoChange(ComponentChange change)
{
Entity entity = Entities.Find(change.EntityId);
Type componentType = change.IsRemoved?change.Before.GetType():change.After.GetType();
if (change.IsRemoved)
{
// Add new component.
if (entity == null) // Add new entity.
{
entity = Entities.AddEntityFromSync(change.EntityId, change.Before);
}
else // Add new component.
{
entity.AddComponent(change.Before);
}
}
else
{
if (change.Before == null)
{
// Remove component.
entity.RemoveComponent(componentType);
}
else
{
// Undo changes in existing component.
EntityComponent existingComponent = entity.GetComponent(componentType);
existingComponent.AddChange(change.Before);
}
}
}
public static void ApplyChange(ComponentChange change)
{
Entity entity = Entities.Find(change.EntityId);
Type componentType = change.IsRemoved?change.Before.GetType():change.After.GetType();
if (change.IsRemoved)
{
if (entity == null)
{
Debug.Log("Received intent to remove component from non-existing entity");
return;
}
else
{
// Remove component.
entity.RemoveComponent(componentType);
}
}
else
{
EntityComponent existingComponent = entity == null ? null : entity.GetComponent(componentType);
if (existingComponent == null)
{
if (entity == null) // Add new entity.
{
entity = Entities.AddEntityFromSync(change.EntityId, change.After);
}
else // Add new component.
{
entity.AddComponent(change.After);
}
}
else
{
// Apply changes to existing component.
existingComponent.AddChange(change.After);
}
}
}