Tempo ramps - audio-locked meters have a bbt of 1|1|0

[ardour.git] / libs / pbd / pbd / undo.h

diff --git a/libs/pbd/pbd/undo.h b/libs/pbd/pbd/undo.h
index 8f1716d09f45e0fe517d2b64eecb2c90b726b7c0..01e1972e998aa6f3ba6c51f755b8d99feaee1223 100644 (file)
--- a/libs/pbd/pbd/undo.h
+++ b/libs/pbd/pbd/undo.h
@@ -1,4 +1,4 @@
-/* 
+/*
     Copyright (C) 2002 Brett Viren & Paul Davis
 
     This program is free software; you can redistribute it and/or modify
@@ -25,12 +25,18 @@
 #include <map>
 #include <sigc++/slot.h>
 #include <sigc++/bind.h>
+#ifndef  COMPILER_MSVC
 #include <sys/time.h>
-#include <pbd/command.h>
+#else
+#include <ardourext/misc.h>
+#endif
+
+#include "pbd/libpbd_visibility.h"
+#include "pbd/command.h"
 
 typedef sigc::slot<void> UndoAction;
 
-class UndoTransaction : public Command
+class LIBPBD_API UndoTransaction : public Command
 {
   public:
        UndoTransaction ();
@@ -65,21 +71,23 @@ class UndoTransaction : public Command
        bool                  _clearing;
 
        friend void command_death (UndoTransaction*, Command *);
+
+       void about_to_explicitly_delete ();
 };
 
-class UndoHistory : public sigc::trackable
+class LIBPBD_API UndoHistory : public PBD::ScopedConnectionList
 {
   public:
        UndoHistory();
        ~UndoHistory() {}
-       
+
        void add (UndoTransaction* ut);
        void undo (unsigned int n);
        void redo (unsigned int n);
-       
+
        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()); }
 
@@ -87,17 +95,26 @@ class UndoHistory : public sigc::trackable
        void clear_undo ();
        void clear_redo ();
 
+       /* 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.
+       */
+
         XMLNode &get_state(int32_t depth = 0);
         void save_state();
 
-       void set_depth (int32_t);
-       int32_t get_depth() const { return _depth; }
+       void set_depth (uint32_t);
+
+       PBD::Signal0<void> Changed;
+       PBD::Signal0<void> BeginUndoRedo;
+       PBD::Signal0<void> EndUndoRedo;
 
-       sigc::signal<void> Changed;
-       
   private:
        bool _clearing;
-       int32_t _depth;
+       uint32_t _depth;
        std::list<UndoTransaction*> UndoList;
        std::list<UndoTransaction*> RedoList;