FadeButton.h

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/*
 * FadeButton.h - declaration of class fadeButton
 *
 * Copyright (c) 2005-2009 Tobias Doerffel <tobydox/at/users.sourceforge.net>
 *
 * This file is part of LMMS - https://lmms.io
 *
 * 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 (see COPYING); if not, write to the
 * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301 USA.
 *
 */
 
#ifndef LMMS_GUI_FADE_BUTTON_H
#define LMMS_GUI_FADE_BUTTON_H
 
#include <QAbstractButton>
#include <QColor>
#include <QElapsedTimer>
 
 
namespace lmms::gui
{
 
 
class FadeButton : public QAbstractButton
{
        Q_OBJECT
public:
        FadeButton( const QColor & _normal_color,
                const QColor & _activated_color,
                const QColor & _hold_color,
                QWidget * _parent );
 
        ~FadeButton() override = default;
        void setActiveColor( const QColor & activated_color );
 
 
public slots:
        void activate();
        void activateOnce();
        void noteEnd();
 
 
protected:
        void paintEvent( QPaintEvent * _pe ) override;
 
 
private:
        QElapsedTimer m_stateTimer;
        QElapsedTimer m_releaseTimer;
 
        // the default color of the widget
        QColor m_normalColor;
        // the color on note play
        QColor m_activatedColor;
        // the color after the "play" fade is done but a note is still playing
        QColor m_holdColor;
        int activeNotes;
 
        QColor fadeToColor(QColor, QColor, QElapsedTimer, float);
 
} ;
 
 
} // namespace lmms::gui
 
#endif // LMMS_GUI_FADE_BUTTON_H