MementoCommandBinder< obj_T > Class Template Reference

#include <memento_command.h>

Inheritance diagram for MementoCommandBinder< obj_T >:

Public Member Functions
virtual void	set_state (XMLNode const &, int version) const =0
virtual XMLNode &	get_state () const =0
virtual std::string	type_name () const =0
virtual void	add_state (XMLNode *)=0
Public Member Functions inherited from PBD::Destructible
virtual	~Destructible ()
virtual void	drop_references ()

Additional Inherited Members
Public Attributes inherited from PBD::Destructible
PBD::Signal< void()>	Destroyed
PBD::Signal< void()>	DropReferences

Detailed Description

template<class obj_T>
class MementoCommandBinder< obj_T >

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

1. 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.
2. 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

add_state()

template<class obj_T >

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

pure virtual

Add our own state to an XMLNode

Implemented in SimpleMementoCommandBinder< obj_T >, and ARDOUR::MidiAutomationListBinder.

get_state()

template<class obj_T >

virtual XMLNode& MementoCommandBinder< obj_T >::get_state ( ) const

pure virtual

Implemented in SimpleMementoCommandBinder< obj_T >, and ARDOUR::MidiAutomationListBinder.

set_state()

template<class obj_T >

virtual void MementoCommandBinder< obj_T >::set_state ( XMLNode const &  , int  version  ) const

pure virtual

Implemented in SimpleMementoCommandBinder< obj_T >, and ARDOUR::MidiAutomationListBinder.

type_name()

template<class obj_T >

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

pure virtual

Returns

Name of our type

Implemented in SimpleMementoCommandBinder< obj_T >, and ARDOUR::MidiAutomationListBinder.

---

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

• memento_command.h