DD::Image::OpMessageObserver Class Reference

Inherited by DD::Image::OpTreeMsgObserver.

Public Types
enum	MessageChange { kMC_Set, kMC_Cleared, kMC_ChildrenChanged }

Public Member Functions
virtual void	notify (const OpMessage &lrMessage, MessageChange lMsgChange, Op *lpSourceOp, const std::vector< OpTree * > &lrAffectedTrees)=0
	The op passed into this function will never be NULL.

Protected Member Functions
	OpMessageObserver ()
	Protected constructor: only create from child classes.
virtual	~OpMessageObserver ()

Detailed Description

Classes can inherit this and add themselves to the op message observers list to be notified when an op message is set or cleared, or when an op's children have changed so the message's effects may do so too.

Member Enumeration Documentation

enum DD::Image::OpMessageObserver::MessageChange

Enumerator
kMC_Set	Sent after a message is set.
kMC_Cleared	Sent after a message is cleared.
kMC_ChildrenChanged	Sent with a blank message after an op's vector of children has changed.

Constructor & Destructor Documentation

OpMessageObserver::~OpMessageObserver ( )

protectedvirtual

Protected destructor (not for polymorphic deletion) Automatically removes this object from the OpMessageHandler observer list. Doesn't need to be virtual, because it's protected, but making it so reduces warnings.