metabutton.h

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/*
 * Copyright (C) 2025 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 <ytkmm/menu.h>
#include <ytkmm/menuitem.h>
 
#include "widgets/ardour_button.h"
#include "widgets/visibility.h"
 
namespace ArdourWidgets {
 
class LIBWIDGETS_API MetaButton : public ArdourButton
{
public:
        MetaButton ();
        virtual ~MetaButton ();
 
        void add_item (std::string const& label, std::string const& menutext, sigc::slot<void> const&);
        void clear_items ();
 
        void set_active (std::string const&);
        void set_index (guint);
 
        guint index () const
        {
                return _active;
        }
 
protected:
        bool on_button_press_event (GdkEventButton*);
        bool on_motion_notify_event (GdkEventMotion*);
        void menu_size_request (Gtk::Requisition*);
        void render (Cairo::RefPtr<Cairo::Context> const&, cairo_rectangle_t*);
 
private:
        class MetaMenuItem : public Gtk::MenuItem
        {
        public:
                MetaMenuItem (std::string const& label, std::string const& menutext, sigc::slot<void> const& cb)
                        : Gtk::MenuItem (menutext, false)
                        , _label (label)
                        , _cb (cb)
                {
                }
 
                void activate () const
                {
                        _cb ();
                }
 
                std::string label () const
                {
                        return _label;
                }
 
                std::string menutext () const
                {
                        return get_label ();
                }
 
        private:
                std::string      _label;
                sigc::slot<void> _cb;
        };
 
        class MetaElement : public Gtk::Menu_Helpers::MenuElem
        {
        public:
                typedef sigc::slot<void, MetaMenuItem const*> SlotActivate;
 
                MetaElement (std::string const& label, std::string const& menutext, sigc::slot<void> const& cb, SlotActivate const& wrap)
                    : Gtk::Menu_Helpers::MenuElem ("")
                {
                        MetaMenuItem* mmi = manage (new MetaMenuItem (label, menutext, cb));
                        child_->unreference ();
                        set_child (mmi);
                        child_->signal_activate ().connect (sigc::bind (wrap, mmi));
                        child_->show ();
                }
        };
 
        void activate_item (MetaMenuItem const*);
        void update_button (MetaMenuItem const*);
 
        Gtk::Menu _menu;
        guint     _active;
        bool      _hover_dropdown;
};
 
} // namespace ArdourWidgets