rollback to 3428, before the mysterious removal of libs/* at 3431/3432

git-svn-id: svn://localhost/ardour2/branches/3.0@3435 d708f5d6-7413-0410-9779-e7cbd77b26cf

1 files changed, 92 insertions, 0 deletions

diff --git a/libs/pbd/pbd/controllable.h b/libs/pbd/pbd/controllable.h
new file mode 100644
index 0000000000..dbb23fdff4
--- /dev/null
+++ b/libs/pbd/pbd/controllable.h
@@ -0,0 +1,92 @@
+/*
+    Copyright (C) 2000-2007 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
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+#ifndef __pbd_controllable_h__
+#define __pbd_controllable_h__
+
+#include <string>
+#include <set>
+
+#include <sigc++/trackable.h>
+#include <sigc++/signal.h>
+
+#include <pbd/statefuldestructible.h>
+
+class XMLNode;
+
+namespace PBD {
+
+class Controllable : public PBD::StatefulDestructible {
+  public:
+	Controllable (std::string name);
+	virtual ~Controllable() { Destroyed (this); }
+
+	virtual void set_value (float) = 0;
+	virtual float get_value (void) const = 0;
+
+	virtual bool can_send_feedback() const { return true; }
+
+	sigc::signal<void> LearningFinished;
+	static sigc::signal<void,PBD::Controllable*,int,int> CreateBinding;
+	static sigc::signal<void,PBD::Controllable*> DeleteBinding;
+
+	static sigc::signal<bool,PBD::Controllable*> StartLearning;
+	static sigc::signal<void,PBD::Controllable*> StopLearning;
+
+	static sigc::signal<void,Controllable*> Destroyed;
+
+	sigc::signal<void> Changed;
+
+	int set_state (const XMLNode&);
+	XMLNode& get_state ();
+
+	std::string name() const { return _name; }
+
+	static Controllable* by_id (const PBD::ID&);
+	static Controllable* by_name (const std::string&);
+
+  private:
+	std::string _name;
+
+	void add ();
+	void remove ();
+
+	typedef std::set<PBD::Controllable*> Controllables;
+	static Glib::Mutex* registry_lock;
+	static Controllables registry;
+};
+
+/* a utility class for the occasions when you need but do not have
+   a Controllable
+*/
+
+class IgnorableControllable : public Controllable 
+{
+  public: 
+    IgnorableControllable () : PBD::Controllable ("ignoreMe") {}
+    ~IgnorableControllable () {}
+    
+    void set_value (float v){}
+    float get_value () const { return 0.0; }
+    bool can_send_feedback () const { return false; }
+};
+
+}
+
+#endif /* __pbd_controllable_h__ */