ardour_fader.h

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/*
 * Copyright (C) 2006 Paul Davis <paul@linuxaudiosystems.com>
 * Copyright (C) 2017 Robin Gareus <robin@gareus.org>
 *
 * 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 _WIDGETS_ARDOUR_FADER_H_
#define _WIDGETS_ARDOUR_FADER_H_
 
#include <cmath>
#include <stdint.h>
 
#include <gdkmm.h>
#include <gtkmm/adjustment.h>
 
#include "gtkmm2ext/cairo_widget.h"
#include "gtkmm2ext/colors.h"
 
#include "widgets/fader_widget.h"
#include "widgets/visibility.h"
 
namespace ArdourWidgets {
 
class LIBWIDGETS_API ArdourFader : virtual public FaderWidget
{
public:
        ArdourFader (Gtk::Adjustment& adjustment, int orientation, int span, int girth);
        virtual ~ArdourFader ();
        static void flush_pattern_cache();
 
        void set_default_value (float);
        void set_text (const std::string&, bool centered = true, bool expose = true);
 
        void set_bg (Gtkmm2ext::Color);
        void set_fg (Gtkmm2ext::Color);
        void unset_bg ();
        void unset_fg ();
 
protected:
        void on_size_request (GtkRequisition*);
        void on_size_allocate (Gtk::Allocation& alloc);
 
        void render (Cairo::RefPtr<Cairo::Context> const&, cairo_rectangle_t*);
        bool on_motion_notify_event (GdkEventMotion*);
 
        void on_state_changed (Gtk::StateType);
        void on_style_changed (const Glib::RefPtr<Gtk::Style>&);
 
private:
        Glib::RefPtr<Pango::Layout> _layout;
        std::string                 _text;
        int _text_width;
        int _text_height;
 
        int _span, _girth;
        int _min_span, _min_girth;
        cairo_pattern_t* _pattern;
 
        int _unity_loc;
        bool _centered_text;
 
        sigc::connection _parent_style_change;
        Widget * _current_parent;
        Gdk::Color get_parent_bg ();
        Gtkmm2ext::Color explicit_bg;
        bool have_explicit_bg;
        Gtkmm2ext::Color explicit_fg;
        bool have_explicit_fg;
 
        uint32_t outline_color;
 
        void create_patterns();
        void set_adjustment_from_event (GdkEventButton *);
        void update_unity_position ();
        int  display_span ();
        Gdk::Color bg_color (Gtk::StateType);
        Gdk::Color fg_color (Gtk::StateType);
 
        struct FaderImage {
                cairo_pattern_t* pattern;
                double fr;
                double fg;
                double fb;
                double br;
                double bg;
                double bb;
                int width;
                int height;
 
                FaderImage (cairo_pattern_t* p,
                                double afr, double afg, double afb,
                                double abr, double abg, double abb,
                                int w, int h)
                        : pattern (p)
                                , fr (afr)
                                 , fg (afg)
                                 , fb (afb)
                                 , br (abr)
                                 , bg (abg)
                                 , bb (abb)
                                 , width (w)
                                 , height (h)
                {}
 
                bool matches (double afr, double afg, double afb,
                                double abr, double abg, double abb,
                                int w, int h) {
                        return width == w &&
                                height == h &&
                                afr == fr &&
                                afg == fg &&
                                afb == fb &&
                                abr == br &&
                                abg == bg &&
                                abb == bb;
                }
        };
 
        static std::list<FaderImage*> _patterns;
        static cairo_pattern_t* find_pattern (double afr, double afg, double afb,
                        double abr, double abg, double abb,
                        int w, int h);
 
};
 
} /* namespace */
 
#endif /* __gtkmm2ext_pixfader_h__ */