#pragma once
 
#ifndef TRENDERERP_INCLUDE
#define TRENDERERP_INCLUDE
 
#include <QObject>
#include <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 final : public QObject {
  Q_OBJECT
 
public:
  struct StartInvokerRenderData {
    unsigned long m_renderId;
    const RenderDataVector *m_renderDataVector;
  };
 
public:
  TRendererStartInvoker() {
    qRegisterMetaType<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