stereo_panner_editor.cc

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/*
    Copyright (C) 2012 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 <gtkmm.h>
#include "gtkmm2ext/utils.h"
#include "gtkmm2ext/gtk_ui.h"
#include "gtkmm2ext/gui_thread.h"
#include "ardour/panner.h"
#include "pbd/controllable.h"
#include "stereo_panner_editor.h"
#include "stereo_panner.h"
#include "i18n.h"

using namespace std;
using namespace Gtk;
using namespace Gtkmm2ext;

StereoPannerEditor::StereoPannerEditor (StereoPanner* p)
        : PannerEditor (_("Stereo Panner"))
        , _panner (p)
        , _ignore_changes (false)
{
        Table* t = manage (new Table (2, 3));
        t->set_spacings (6);

        int n = 0;
        
        t->attach (*manage (left_aligned_label (_("Position"))), 0, 1, n, n + 1);
        t->attach (_position, 1, 2, n, n + 1);
        t->attach (*manage (left_aligned_label (_("%"))), 2, 3, n, n + 1);
        ++n;
        
        t->attach (*manage (left_aligned_label (_("Width"))), 0, 1, n, n + 1);
        t->attach (_width, 1, 2, n, n + 1);
        t->attach (*manage (left_aligned_label (_("%"))), 2, 3, n, n + 1);
        ++n;

        get_vbox()->pack_start (*manage (t));
        get_vbox()->set_spacing (6);

        _position.set_increments (1, 10);
        _width.set_increments (1, 10);
        set_position_range ();
        set_width_range ();

        _panner->get_position_controllable()->Changed.connect (
                _connections, invalidator (*this), boost::bind (&StereoPannerEditor::update_editor, this), gui_context ()
                );

        _panner->get_width_controllable()->Changed.connect (
                _connections, invalidator (*this), boost::bind (&StereoPannerEditor::update_editor, this), gui_context ()
                );
        
        _panner->DropReferences.connect (_connections, invalidator (*this), boost::bind (&StereoPannerEditor::panner_going_away, this), gui_context ());
        _position.signal_value_changed().connect (sigc::mem_fun (*this, &StereoPannerEditor::position_changed));
        _width.signal_value_changed().connect (sigc::mem_fun (*this, &StereoPannerEditor::width_changed));

        show_all ();
        update_editor ();
}

void
StereoPannerEditor::panner_going_away ()
{
        _panner = 0;
}

void
StereoPannerEditor::update_editor ()
{
        if (!_panner) {
                return;
        }
        
        _ignore_changes = true;
        _position.set_value (100 * _panner->get_position_controllable()->get_value ());
        _width.set_value (100 * _panner->get_width_controllable()->get_value ());
        _ignore_changes = false;
}

void
StereoPannerEditor::position_changed ()
{
        if (_ignore_changes || !_panner) {
                return;
        }

        _ignore_changes = true;
        double const v = _position.get_value() / 100;
        _panner->get_position_controllable()->set_value (v);
        set_width_range ();
        _ignore_changes = false;
}

void
StereoPannerEditor::width_changed ()
{
        if (_ignore_changes || !_panner) {
                return;
        }

        _ignore_changes = true;
        double const v = _width.get_value() / 100;
        _panner->get_width_controllable()->set_value (v);
        set_position_range ();
        _ignore_changes = false;
}

void
StereoPannerEditor::set_position_range ()
{
        pair<double, double> const pr = _panner->panner()->position_range ();
        _position.set_range (pr.first * 100, pr.second * 100);
}

void
StereoPannerEditor::set_width_range ()
{
        pair<double, double> const wr = _panner->panner()->width_range ();
        _width.set_range (wr.first * 100, wr.second * 100);
}