qskinny/src/controls/QskSkinStateChanger.h

/******************************************************************************
 * QSkinny - Copyright (C) 2016 Uwe Rathmann
 * This file may be used under the terms of the QSkinny License, Version 1.0
 *****************************************************************************/

#ifndef QSK_SKIN_STATE_CHANGER_H
#define QSK_SKIN_STATE_CHANGER_H

#include "QskAspect.h"
#include "QskSkinnable.h"

class QskSkinStateChanger
{
  public:
    QskSkinStateChanger( const QskSkinnable*,
        QskAspect::States = QskAspect::States() );

    ~QskSkinStateChanger();

    void addStates( QskAspect::States );
    void clearStates( QskAspect::States );

  private:
    QskSkinnable* m_skinnable;
    const QskAspect::States m_oldStates;
};

inline QskSkinStateChanger::QskSkinStateChanger(
        const QskSkinnable* skinnable, QskAspect::States states )
    : m_skinnable( const_cast< QskSkinnable* >( skinnable ) )
    , m_oldStates( skinnable->skinStates() )
{
    addStates( states );
}

inline QskSkinStateChanger::~QskSkinStateChanger()
{
    if ( m_oldStates != m_skinnable->skinStates() )
        m_skinnable->replaceSkinStates( m_oldStates );
}

inline void QskSkinStateChanger::addStates( QskAspect::States states )
{
    const auto newStates = m_oldStates | states;

    if ( newStates != m_skinnable->skinStates() )
        m_skinnable->replaceSkinStates( newStates );
}

inline void QskSkinStateChanger::clearStates( QskAspect::States states )
{
    const auto newStates = m_oldStates & ~states;

    if ( newStates != m_skinnable->skinStates() )
        m_skinnable->replaceSkinStates( newStates );
}

#endif