X-Git-Url: https://main.carlh.net/gitweb/?a=blobdiff_plain;f=libs%2Fpbd%2Fpbd%2Fundo.h;h=e9582a1b53dd40cdc9308bbf7097fa7c2e0f69da;hb=08371ae2cf6231bbb8522645d14add41ffa9c1c0;hp=724e86aaa05ccfa58a898babf351a313be08b45e;hpb=ab6f1ed9bafa869648b6e94ee5186ff317b32c3e;p=ardour.git

diff --git a/libs/pbd/pbd/undo.h b/libs/pbd/pbd/undo.h
index 724e86aaa0..e9582a1b53 100644
--- a/libs/pbd/pbd/undo.h
+++ b/libs/pbd/pbd/undo.h
@@ -1,5 +1,5 @@
 /* 
-   Copyright (C) 2002 Brett Viren & Paul Davis
+    Copyright (C) 2002 Brett Viren & Paul Davis
 
     This program is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
@@ -15,7 +15,6 @@
     along with this program; if not, write to the Free Software
     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 
-    $Id$
 */
 
 #ifndef __lib_pbd_undo_h__
@@ -26,11 +25,13 @@
 #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
 
-using std::string;
-using std::list;
+#include "pbd/command.h"
 
 typedef sigc::slot<void> UndoAction;
 
@@ -40,21 +41,20 @@ class UndoTransaction : public Command
 	UndoTransaction ();
 	UndoTransaction (const UndoTransaction&);
 	UndoTransaction& operator= (const UndoTransaction&);
+	~UndoTransaction ();
 
 	void clear ();
+	bool empty() const;
+	bool clearing () const { return _clearing; }
 
-	void add_command (Command *const);
+	void add_command (Command* const);
+	void remove_command (Command* const);
 
-        void operator() ();
+	void operator() ();
 	void undo();
 	void redo();
 
 	XMLNode &get_state();
-	
-	void set_name (const string& str) {
-		_name = str;
-	}
-	const string& name() const { return _name; }
 
 	void set_timestamp (struct timeval &t) {
 		_timestamp = t;
@@ -65,36 +65,59 @@ class UndoTransaction : public Command
 	}
 
   private:
-	list<Command*>	 actions;
-	struct timeval   _timestamp;
-	string           _name;
+	std::list<Command*>    actions;
+	struct timeval        _timestamp;
+	bool                  _clearing;
+
+	friend void command_death (UndoTransaction*, Command *);
+	
+	void about_to_explicitly_delete ();
 };
 
-class UndoHistory
+class UndoHistory : public PBD::ScopedConnectionList
 {
   public:
-	UndoHistory() {}
+	UndoHistory();
 	~UndoHistory() {}
 	
-	void add (UndoTransaction ut);
+	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(); }
 	
-	string next_undo() const { return (UndoList.empty() ? string("") : UndoList.back().name()); }
-	string next_redo() const { return (RedoList.empty() ? 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();
+	/* 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 (uint32_t);
+
+	PBD::Signal0<void> Changed;
+	PBD::Signal0<void> BeginUndoRedo;
+	PBD::Signal0<void> EndUndoRedo;
+	
   private:
-	list<UndoTransaction> UndoList;
-	list<UndoTransaction> RedoList;
+	bool _clearing;
+	uint32_t _depth;
+	std::list<UndoTransaction*> UndoList;
+	std::list<UndoTransaction*> RedoList;
+
+	void remove (UndoTransaction*);
 };