X-Git-Url: https://main.carlh.net/gitweb/?a=blobdiff_plain;f=libs%2Fpbd%2Fpbd%2Fundo.h;h=11ff2bf321b806106001ce8a9f27d768b890c86a;hb=a459f96e38f569503e6d983808210d9d43a396ec;hp=5bfccf5a062fdf9bdfac4e625eb0ba9b6e001280;hpb=d7db3f757fde92126ef9886370ce604992b7e974;p=ardour.git

diff --git a/libs/pbd/pbd/undo.h b/libs/pbd/pbd/undo.h
index 5bfccf5a06..11ff2bf321 100644
--- a/libs/pbd/pbd/undo.h
+++ b/libs/pbd/pbd/undo.h
@@ -26,7 +26,8 @@
 #include <sigc++/slot.h>
 #include <sigc++/bind.h>
 #include <sys/time.h>
-#include <pbd/command.h>
+
+#include "pbd/command.h"
 
 typedef sigc::slot<void> UndoAction;
 
@@ -65,9 +66,11 @@ class UndoTransaction : public Command
 	bool                  _clearing;
 
 	friend void command_death (UndoTransaction*, Command *);
+	
+	void about_to_explicitly_delete ();
 };
 
-class UndoHistory : public sigc::trackable
+class UndoHistory : public PBD::ScopedConnectionList
 {
   public:
 	UndoHistory();
@@ -80,20 +83,33 @@ class UndoHistory : public sigc::trackable
 	unsigned long undo_depth() const { return UndoList.size(); }
 	unsigned long redo_depth() const { return RedoList.size(); }
 	
-	std::string next_undo() const { return (UndoList.empty() ? std::string("") : UndoList.back()->name()); }
-	std::string next_redo() const { return (RedoList.empty() ? std::string("") : RedoList.back()->name()); }
+	std::string next_undo() const { return (UndoList.empty() ? std::string() : UndoList.back()->name()); }
+	std::string next_redo() const { return (RedoList.empty() ? std::string() : RedoList.back()->name()); }
 
 	void clear ();
 	void clear_undo ();
 	void clear_redo ();
 
-	XMLNode &get_state(uint32_t depth = 0);
-	void save_state();
+	/* returns all or part of the history.
+	   If depth==0 it returns just the top
+	   node. If depth<0, it returns everything.
+	   If depth>0, it returns state for that
+	   many elements of the history, or 
+	   the full history, whichever is smaller.
+	*/
 
-	sigc::signal<void> Changed;
+        XMLNode &get_state(int32_t depth = 0);
+        void save_state();
 
+	void set_depth (uint32_t);
+
+	PBD::Signal0<void> Changed;
+	PBD::Signal0<void> BeginUndoRedo;
+	PBD::Signal0<void> EndUndoRedo;
+	
   private:
 	bool _clearing;
+	uint32_t _depth;
 	std::list<UndoTransaction*> UndoList;
 	std::list<UndoTransaction*> RedoList;