fader_widget.h

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/*
 * Copyright (C) 2024 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.
 */
 
#pragma once
 
#include <gtkmm/adjustment.h>
#include "gtkmm2ext/cairo_widget.h"
 
#include "widgets/visibility.h"
 
namespace ArdourWidgets {
 
class LIBWIDGETS_API FaderWidget : public virtual CairoWidget
{
public:
        FaderWidget (Gtk::Adjustment&, int orient);
        virtual ~FaderWidget () {};
 
        sigc::signal<void,int> StartGesture;
        sigc::signal<void,int> StopGesture;
        sigc::signal<void> OnExpose;
 
        virtual void set_default_value (float) = 0;
 
        enum Tweaks {
                NoShowUnityLine = 0x1,
                NoButtonForward = 0x2,
                NoVerticalScroll = 0x4,
                DoubleClickReset = 0x8,
        };
 
        enum Orientation {
                VERT,
                HORIZ,
        };
 
        void set_tweaks (Tweaks);
        Tweaks tweaks() const { return _tweaks; }
 
        int orientation () const { return _orien; }
 
        virtual void set_bg (Gtkmm2ext::Color) = 0;
        virtual void set_fg (Gtkmm2ext::Color) = 0;
        virtual void unset_bg () = 0;
        virtual void unset_fg () = 0;
 
protected:
        bool on_button_press_event (GdkEventButton*);
        bool on_button_release_event (GdkEventButton*);
        bool on_enter_notify_event (GdkEventCrossing* ev);
        bool on_leave_notify_event (GdkEventCrossing* ev);
        bool on_scroll_event (GdkEventScroll* ev);
        bool on_grab_broken_event (GdkEventGrabBroken*);
 
        void adjustment_changed ();
 
        virtual void set_adjustment_from_event (GdkEventButton*) = 0;
 
        Gtk::Adjustment& _adjustment;
 
        Tweaks _tweaks;
        int    _orien;
        bool   _dragging;
        bool   _hovering;
        float  _default_value;
 
 
        GdkWindow* _grab_window;
        double     _grab_loc;
        double     _grab_start;
};
 
}