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:
    enum class State
    {
        Normal,
        Corrupted,
    };

    FadeButton(
        const QColor& inactiveColor,
        const QColor& normalColor,
        const QColor& corruptedColor,
        const QColor& mutedColor,
        const QColor& holdColor,
        QWidget* parent = nullptr);

    FadeButton(QWidget* parent = nullptr);

    ~FadeButton() override = default;

    auto state() const -> State;

    auto muted() const -> bool;

    void setState(State state);

    void setMuted(bool mute);
 
public slots:
    void activate();
    void activateOnce();
    void noteEnd();
 
private:
    void paintEvent(QPaintEvent* pe) override;
 
    State m_state = State::Normal;
 
    QElapsedTimer m_stateTimer;
    QElapsedTimer m_releaseTimer;
 
    QColor m_inactiveColor;
    QColor m_normalColor;
    QColor m_corruptedColor;
    QColor m_mutedColor;
    QColor m_holdColor;
 
    int activeNotes;
    bool m_muted = false;
 
    QColor fadeToColor(QColor, QColor, QElapsedTimer, float);
    QColor activeColor() const;
} ;
 
 
} // namespace lmms::gui
 
#endif // LMMS_GUI_FADE_BUTTON_H