knob.h

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/*
 * Copyright (C) 2016 Paul Davis <paul@linuxaudiosystems.com>
 *
 * 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.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
 
#ifndef __ardour_push2_knob_h__
#define __ardour_push2_knob_h__
 
#include <memory>
 
#include <sigc++/trackable.h>
 
#include <cairomm/refptr.h>
 
#include "pbd/signals.h"
 
#include "canvas/container.h"
 
namespace ArdourCanvas {
        class Text;
}
 
namespace ARDOUR {
        class AutomationControl;
}
 
namespace Cairo {
        class Context;
}
 
namespace ArdourSurface {
 
class Push2;
 
class Push2Knob : public sigc::trackable, public ArdourCanvas::Container
{
public:
        enum Element {
                Arc = 0x1,
                Bevel = 0x2,
                unused2 = 0x4,
                unused3 = 0x8,
                unused4 = 0x10,
                unused5 = 0x20,
        };
 
        enum Flags {
                NoFlags = 0,
                Detent = 0x1,
                ArcToZero = 0x2,
        };
 
        Push2Knob (Push2& p, ArdourCanvas::Item*, Element e = default_elements, Flags flags = NoFlags);
        virtual ~Push2Knob ();
 
        static Element default_elements;
 
        void add_flag (Flags);
        void remove_flag (Flags);
 
        void set_controllable (std::shared_ptr<ARDOUR::AutomationControl> c);
        std::shared_ptr<ARDOUR::AutomationControl> controllable() const { return _controllable; }
 
        void set_text_color (Gtkmm2ext::Color);
        void set_arc_start_color (Gtkmm2ext::Color);
        void set_arc_end_color (Gtkmm2ext::Color);
        void set_radius (double r);
 
        void render (ArdourCanvas::Rect const &, Cairo::RefPtr<Cairo::Context>) const;
        void compute_bounding_box() const;
 
  protected:
        void controllable_changed ();
        PBD::ScopedConnection watch_connection;
        std::shared_ptr<ARDOUR::AutomationControl> _controllable;
 
  private:
        Push2&  _p2;
        Element _elements;
        Flags   _flags;
        double  _r;
        float   _val;    // current value [0..1]
        float   _normal; // default value, arc
 
        Gtkmm2ext::Color    _text_color;
        Gtkmm2ext::Color    _arc_start_color;
        Gtkmm2ext::Color    _arc_end_color;
        ArdourCanvas::Text* _text;
 
        void set_pan_azimuth_text (double);
        void set_pan_width_text (double);
        void set_gain_text (double);
};
 
} // namespace
 
#endif /* __ardour_push2_knob_h__ */