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, 91 insertions, 0 deletions

diff --git a/libs/ardour/automation_control.cc b/libs/ardour/automation_control.cc
new file mode 100644
index 0000000000..4885a6fed9
--- /dev/null
+++ b/libs/ardour/automation_control.cc
@@ -0,0 +1,91 @@
+/*
+    Copyright (C) 2007 Paul Davis 
+    Author: Dave Robillard
+
+    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.
+
+*/
+
+#include <iostream>
+#include <ardour/automation_control.h>
+#include <ardour/session.h>
+#include <ardour/automatable.h>
+#include <ardour/midi_track.h>
+
+using namespace std;
+using namespace ARDOUR;
+using namespace PBD;
+
+
+AutomationControl::AutomationControl(Session& session, boost::shared_ptr<AutomationList> list, string name)
+	: Controllable((name == "unnamed controllable") ? list->parameter().to_string() : name)
+	, _session(session)
+	, _list(list)
+	, _user_value(list->default_value())
+{
+}
+
+
+/** Get the currently effective value (ie the one that corresponds to current output)
+ */
+float
+AutomationControl::get_value() const
+{
+	if (_list->automation_playback())
+		return _list->eval(_session.transport_frame());
+	else
+		return _user_value;
+}
+
+
+void
+AutomationControl::set_value(float value)
+{
+	_user_value = value;
+	
+	if (_session.transport_stopped() && _list->automation_write())
+		_list->add(_session.transport_frame(), value);
+
+	Changed(); /* EMIT SIGNAL */
+}
+
+
+/** Get the latest user-set value, which may not equal get_value() when automation
+ * is playing back, etc.
+ *
+ * Automation write/touch works by periodically sampling this value and adding it
+ * to the AutomationList.
+ */
+float
+AutomationControl::user_value() const
+{
+	return _user_value;
+}
+	
+
+void
+AutomationControl::set_list(boost::shared_ptr<ARDOUR::AutomationList> list)
+{
+	_list = list;
+	_user_value = list->default_value();
+	Changed();  /* EMIT SIGNAL */
+}
+
+	
+Parameter
+AutomationControl::parameter() const
+{
+	return _list->parameter();
+}