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Diffstat (limited to 'libs/pbd/pbd/undo.h')
| -rw-r--r-- | libs/pbd/pbd/undo.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/libs/pbd/pbd/undo.h b/libs/pbd/pbd/undo.h index 277c41c2af..eb46750e4f 100644 --- a/libs/pbd/pbd/undo.h +++ b/libs/pbd/pbd/undo.h @@ -74,7 +74,7 @@ class UndoTransaction : public Command friend void command_death (UndoTransaction*, Command *); }; -class UndoHistory +class UndoHistory : public sigc::trackable { public: UndoHistory(); @@ -97,6 +97,8 @@ class UndoHistory XMLNode &get_state(); void save_state(); + sigc::signal<void> Changed; + private: bool _clearing; std::list<UndoTransaction*> UndoList; |