ardour_dropdown.cc

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/*
    Copyright (C) 2014 Paul Davis

    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.

*/

#include <iostream>
#include <cmath>
#include <algorithm>

#include <pangomm/layout.h>

#include "pbd/compose.h"
#include "pbd/error.h"
#include "pbd/stacktrace.h"

#include "gtkmm2ext/utils.h"
#include "gtkmm2ext/rgb_macros.h"
#include "gtkmm2ext/gui_thread.h"

#include "ardour/rc_configuration.h" // for widget prelight preference

#include "ardour_dropdown.h"
#include "ardour_ui.h"
#include "global_signals.h"

#include "i18n.h"

#define REFLECTION_HEIGHT 2

using namespace Gdk;
using namespace Gtk;
using namespace Glib;
using namespace PBD;
using std::max;
using std::min;
using namespace std;


ArdourDropdown::ArdourDropdown (Element e)
{
//      signal_button_press_event().connect (sigc::mem_fun(*this, &ArdourDropdown::on_mouse_pressed));

        add_elements(e);
        add_elements(ArdourButton::Menu);
}

ArdourDropdown::~ArdourDropdown ()
{
}

bool
ArdourDropdown::on_button_press_event (GdkEventButton* ev)
{
        if (ev->type == GDK_BUTTON_PRESS) {
                _menu.popup (1, gtk_get_current_event_time());
        }
        return true;
}

bool
ArdourDropdown::on_scroll_event (GdkEventScroll* ev)
{
        using namespace Menu_Helpers;

        const MenuItem * current_active = _menu.get_active();
        const MenuList& items = _menu.items ();
        int c = 0;

        if (!current_active) {
                return true;
        }

        /* work around another gtkmm API clusterfuck
         * const MenuItem* get_active () const
         * void set_active (guint index)
         *
         * also MenuList.activate_item does not actually
         * set it as active in the menu.
         *
         */

        switch (ev->direction) {
                case GDK_SCROLL_UP:

                        for (MenuList::const_reverse_iterator i = items.rbegin(); i != items.rend(); ++i, ++c) {
                                if ( &(*i) != current_active) {
                                        continue;
                                }
                                if (++i != items.rend()) {
                                        c = items.size() - 2 - c;
                                        assert(c >= 0);
                                        _menu.set_active(c);
                                        _menu.activate_item(*i);
                                }
                                break;
                        }
                        break;
                case GDK_SCROLL_DOWN:
                        for (MenuList::const_iterator i = items.begin(); i != items.end(); ++i, ++c) {
                                if ( &(*i) != current_active) {
                                        continue;
                                }
                                if (++i != items.end()) {
                                        assert(c + 1 < (int) items.size());
                                        _menu.set_active(c + 1);
                                        _menu.activate_item(*i);
                                }
                                break;
                        }
                        break;
                default:
                        break;
        }
        return true;
}

void
ArdourDropdown::clear_items ()
{
        _menu.items ().clear ();
}

void
ArdourDropdown::AddMenuElem (Menu_Helpers::MenuElem e)
{
        using namespace Menu_Helpers;

        MenuList& items = _menu.items ();
        
        items.push_back (e);
}