Inheritance diagram for MementoCommandBinder< obj_T >:

Public Member Functions
virtual obj_T *	get () const =0

virtual std::string	type_name () const

virtual void	add_state (XMLNode *)=0

Public Member Functions inherited from PBD::Destructible
	Destructible ()

virtual	~Destructible ()

void	drop_references ()

Additional Inherited Members
Public Attributes inherited from PBD::Destructible
PBD::Signal0< void >	Destroyed

PBD::Signal0< void >	DropReferences

Detailed Description

A class that can return a Stateful object which is the subject of a MementoCommand.

The existence of this class means that the undo record can refer to objects which don't exist in the session file. Currently this is used for

MIDI automation; when MIDI automation is edited, undo records are written for the AutomationList being changed. However this AutomationList is a temporary structure, built by a MidiModel, which doesn't get written to the session file. Hence we need to be able to go from a MidiSource and Parameter to an AutomationList. This Binder mechanism allows this through MidiAutomationListBinder; the undo record stores the source and parameter, and these are bound to an AutomationList by the Binder.
Crossfades; unlike regions, these are completely removed from a session when they are deleted. This means that the undo record can contain references to non-existant crossfades. To get around this, CrossfadeBinder can do `just-in-time' binding from the crossfade ID.

Definition at line 54 of file memento_command.h.

Member Function Documentation

template<class obj_T>

virtual void MementoCommandBinder< obj_T >::add_state ( XMLNode * )

pure virtual

Add our own state to an XMLNode

template<class obj_T>

virtual obj_T* MementoCommandBinder< obj_T >::get ( ) const

pure virtual

template<class obj_T>

virtual std::string MementoCommandBinder< obj_T >::type_name ( ) const

inlinevirtual

Definition at line 61 of file memento_command.h.

The documentation for this class was generated from the following file: