step_button.h

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/*
    Copyright (C) 2011-2013 Paul Davis
    Author: Carl Hetherington <cth@carlh.net>
 
    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 __CANVAS_STEP_H__
#define __CANVAS_STEP_H__
 
#include <cairomm/pattern.h>
 
#include "canvas/visibility.h"
#include "canvas/item.h"
#include "canvas/types.h"
 
#include "gtkmm2ext/colors.h"
 
namespace Cairo {
class LinearGradient;
}
 
namespace ArdourCanvas
{
class Text;
 
class LIBCANVAS_API StepButton : public Item
{
public:
        StepButton (Canvas*, double width, double height, Gtkmm2ext::Color c = Gtkmm2ext::rgba_to_color (0, 0, 0, 1.0));
 
        void render (Rect const &, Cairo::RefPtr<Cairo::Context>) const;
        void compute_bounding_box () const;
 
        void set_value (double val);
        double value() const { return current_value; }
 
        void set_size (double w, double h);
        void set_highlight (bool);
        void set_color (Gtkmm2ext::Color);
 
        Text* text() const { return label; }
 
  private:
        double width;
        double height;
        Text* label;
        double current_value;
        bool prelight;
        bool highlight;
        bool dragging;
        bool clicking;
        double scale;
        Gtkmm2ext::HSV color;
 
        Cairo::RefPtr<Cairo::LinearGradient> inactive_pattern;
        Cairo::RefPtr<Cairo::LinearGradient> enabled_pattern;
 
        void create_patterns ();
        bool event_handler (GdkEvent*);
};
 
}
 
#endif