#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 corrispondant

//! 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 : 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