1 files changed, 142 insertions, 0 deletions
diff --git a/libs/widgets/ardour_display.cc b/libs/widgets/ardour_display.cc
new file mode 100644
index 0000000000..ef23edb586
--- /dev/null
+++ b/libs/widgets/ardour_display.cc
@@ -0,0 +1,142 @@
+/*
+    Copyright (C) 2014 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.
+
+*/
+
+#include <iostream>
+#include <cmath>
+#include <algorithm>
+
+#include <pangomm/layout.h>
+
+#include "pbd/compose.h"
+#include "pbd/controllable.h"
+#include "pbd/error.h"
+#include "pbd/stacktrace.h"
+
+#include "gtkmm2ext/utils.h"
+#include "gtkmm2ext/rgb_macros.h"
+#include "gtkmm2ext/gui_thread.h"
+#include "gtkmm2ext/keyboard.h"
+
+#include "widgets/ardour_display.h"
+
+#include "pbd/i18n.h"
+
+using namespace Gtkmm2ext;
+using namespace Gdk;
+using namespace Gtk;
+using namespace Glib;
+using namespace PBD;
+using namespace ArdourWidgets;
+using std::max;
+using std::min;
+using namespace std;
+
+ArdourDisplay::ArdourDisplay (Element e)
+{
+	add_elements(ArdourButton::Text);
+}
+
+ArdourDisplay::~ArdourDisplay ()
+{
+}
+
+
+bool
+ArdourDisplay::on_scroll_event (GdkEventScroll* ev)
+{
+	/* mouse wheel */
+
+	float scale = 1.0;
+	if (ev->state & Keyboard::GainFineScaleModifier) {
+		if (ev->state & Keyboard::GainExtraFineScaleModifier) {
+			scale *= 0.01;
+		} else {
+			scale *= 0.10;
+		}
+	}
+
+	boost::shared_ptr<PBD::Controllable> c = binding_proxy.get_controllable();
+	if (c) {
+		float val = c->get_interface();
+
+		if ( ev->direction == GDK_SCROLL_UP )
+			val += 0.05 * scale;  //by default, we step in 1/20ths of the knob travel
+		else
+			val -= 0.05 * scale;
+
+		c->set_interface(val);
+	}
+
+	return true;
+}
+
+
+void
+ArdourDisplay::add_controllable_preset (const char *txt, float val)
+{
+	using namespace Menu_Helpers;
+	AddMenuElem(MenuElem (txt, sigc::bind (sigc::mem_fun(*this, &ArdourDisplay::handle_controllable_preset), val)));
+}
+
+static inline float dB_to_coefficient (float dB) {
+	return dB > -318.8f ? pow (10.0f, dB * 0.05f) : 0.0f;
+}
+
+void
+ArdourDisplay::handle_controllable_preset (float p)
+{
+	boost::shared_ptr<PBD::Controllable> c = binding_proxy.get_controllable();
+
+	if (!c) return;
+
+	/* This should not use dB_to_coefficient(), but the Controllable's value.
+	 *
+	 * The only user of this API is currently monitor_section.cc which conveniently
+	 * binds dB values. Once there are other use-cases, for this, this (GUI only) API
+	 * needs fixing.
+	 */
+	c->set_value(dB_to_coefficient (p), Controllable::NoGroup);
+}
+
+
+void
+ArdourDisplay::set_controllable (boost::shared_ptr<Controllable> c)
+{
+    watch_connection.disconnect ();  //stop watching the old controllable
+
+	if (!c) return;
+
+	binding_proxy.set_controllable (c);
+
+	c->Changed.connect (watch_connection, invalidator(*this), boost::bind (&ArdourDisplay::controllable_changed, this), gui_context());
+
+	controllable_changed();
+}
+
+void
+ArdourDisplay::controllable_changed ()
+{
+	boost::shared_ptr<PBD::Controllable> c = binding_proxy.get_controllable();
+
+	if (!c) return;
+
+	set_text(c->get_user_string());
+
+	set_dirty();
+}