drawable.h

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// SPDX-FileCopyrightText: Copyright (C) 2015 swift Project Community / Contributors
// SPDX-License-Identifier: GPL-3.0-or-later OR LicenseRef-swift-pilot-client-1
 
#ifndef SWIFT_SIM_XSWIFTBUS_DRAWABLE_H
#define SWIFT_SIM_XSWIFTBUS_DRAWABLE_H
 
 
#include <XPLMDisplay.h>
 
namespace XSwiftBus
{
 
    class CDrawable
    {
    public:
        CDrawable(XPLMDrawingPhase phase, bool before) : m_phase(phase), m_before(before) {}
 
        virtual ~CDrawable() { hide(); }
 
        bool isVisible() const { return m_visible; }
 
        void show()
        {
            if (m_visible) { return; }
            m_visible = true;
            XPLMRegisterDrawCallback(callback, m_phase, m_before, static_cast<void *>(this));
        }
 
        void hide()
        {
            if (!m_visible) { return; }
            m_visible = false;
            XPLMUnregisterDrawCallback(callback, m_phase, m_before, static_cast<void *>(this));
        }
 
    protected:
        virtual void draw() = 0;
 
    private:
        static int callback(XPLMDrawingPhase, int, void *refcon)
        {
            static_cast<CDrawable *>(refcon)->draw();
            return 1;
        }
 
        XPLMDrawingPhase m_phase;
        bool m_before = false;
        bool m_visible = false;
    };
 
} // namespace XSwiftBus
 
#endif // SWIFT_SIM_XSWIFTBUS_DRAWABLE_H