diff options
Diffstat (limited to 'libs/pbd/pbd')
| -rw-r--r-- | libs/pbd/pbd/properties.h | 6 | ||||
| -rw-r--r-- | libs/pbd/pbd/stateful.h | 19 |
2 files changed, 22 insertions, 3 deletions
diff --git a/libs/pbd/pbd/properties.h b/libs/pbd/pbd/properties.h index 274dfffd9c..8d2f465ebf 100644 --- a/libs/pbd/pbd/properties.h +++ b/libs/pbd/pbd/properties.h @@ -122,8 +122,10 @@ protected: {} void set (T const& v) { - _old = _current; - _have_old = true; + if (!_have_old) { + _old = _current; + _have_old = true; + } _current = v; } diff --git a/libs/pbd/pbd/stateful.h b/libs/pbd/pbd/stateful.h index 78b9eb7b3b..93f353a095 100644 --- a/libs/pbd/pbd/stateful.h +++ b/libs/pbd/pbd/stateful.h @@ -82,6 +82,12 @@ class Stateful { static int current_state_version; static int loading_state_version; + virtual void suspend_property_changes (); + virtual void resume_property_changes (); + + void unlock_property_changes () { _no_property_changes = false; } + void block_property_changes () { _no_property_changes = true; } + protected: void add_instant_xml (XMLNode&, const sys::path& directory_path); @@ -100,10 +106,21 @@ class Stateful { XMLNode *_extra_xml; XMLNode *_instant_xml; - PBD::ID _id; + PBD::ID _id; + int32_t _frozen; + bool _no_property_changes; + PBD::PropertyChange _pending_changed; + Glib::Mutex _lock; std::string _xml_node_name; ///< name of node to use for this object in XML OwnedPropertyList* _properties; + + virtual void send_change (const PropertyChange&); + /** derived classes can implement this in order to process a property change + within thaw() just before send_change() is called. + */ + virtual void mid_thaw (const PropertyChange&) { } + bool property_changes_suspended() const { return g_atomic_int_get (&_frozen) > 0; } }; } // namespace PBD |