#pragma once

#ifndef TRENDERERP_INCLUDE

#define TRENDERERP_INCLUDE

#include <qobject></qobject>

#include <qmetatype></qmetatype>

#include "trenderer.h"

//=============================================================================================

//! This is a private class used to convey the TRenderer::startRendering

//! methods into Qt queued slots. This is necessary since these methods

//! implicitly

//! perform event processing, which could cause trouble in case they are invoked

//! from

//! events which must respect a strict ordering.

//! \n \n

//! For example, suppose that a render must be invoked upon a mousePressEvent,

//! and that such event must have been completely processed before the

//! correspondent

//! mouseReleaseEvent is invoked - calling the startRendering method *directly*

//! by

//! the mousePressEvent may cause the mouseReleaseEvent to be processed before

//! the

//! former's end.

class TRendererStartInvoker final : public QObject {

  Q_OBJECT

public:

  struct StartInvokerRenderData {

    unsigned long m_renderId;

    const RenderDataVector *m_renderDataVector;

  };

public:

  TRendererStartInvoker() {

    qRegisterMetaType<startinvokerrenderdata>("StartInvokerRenderData");</startinvokerrenderdata>

    connect(this, SIGNAL(startRender(TRendererImp *, StartInvokerRenderData)),

            this, SLOT(doStartRender(TRendererImp *, StartInvokerRenderData)),

            Qt::QueuedConnection);

  }

  ~TRendererStartInvoker() {}

  static TRendererStartInvoker *instance() {

    static TRendererStartInvoker theInstance;

    return &theInstance;

  }

  void emitStartRender(TRendererImp *renderer, StartInvokerRenderData rd);

Q_SIGNALS:

  void startRender(TRendererImp *, StartInvokerRenderData);

public Q_SLOTS:

  void doStartRender(TRendererImp *, StartInvokerRenderData rd);

};

#endif  // TRENDERERP_INCLUDE