6.4.1 Object hooks

The object hooks handle the changes of non-graphic kernel objects. They provide these callback calls:

• Link – an object was linked into the universe
• Unlink – an object was unlinked from the universe
• Select – an object was selected
• Unselect – an object was unselected
• Property create – a new property was created for an object
• Properties changed – one or more properties were changed for an object
• Property delete – a property was deleted from the object

The Link and Unlink hooks are not called recursively; if the object has a subtree of descendants, no hook is called for them.