63 lines
1.8 KiB
C++
63 lines
1.8 KiB
C++
#pragma once
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#ifndef TRENDERERP_INCLUDE
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#define TRENDERERP_INCLUDE
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#include <QObject>
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#include <QMetaType>
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#include "trenderer.h"
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//=============================================================================================
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//! This is a private class used to convey the TRenderer::startRendering
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//! methods into Qt queued slots. This is necessary since these methods
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//! implicitly
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//! perform event processing, which could cause trouble in case they are invoked
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//! from
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//! events which must respect a strict ordering.
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//! \n \n
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//! For example, suppose that a render must be invoked upon a mousePressEvent,
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//! and that such event must have been completely processed before the
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//! corrispondant
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//! mouseReleaseEvent is invoked - calling the startRendering method *directly*
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//! by
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//! the mousePressEvent may cause the mouseReleaseEvent to be processed before
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//! the
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//! former's end.
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class TRendererStartInvoker final : public QObject {
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Q_OBJECT
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public:
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struct StartInvokerRenderData {
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unsigned long m_renderId;
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const RenderDataVector *m_renderDataVector;
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};
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public:
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TRendererStartInvoker() {
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qRegisterMetaType<StartInvokerRenderData>("StartInvokerRenderData");
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connect(this, SIGNAL(startRender(TRendererImp *, StartInvokerRenderData)),
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this, SLOT(doStartRender(TRendererImp *, StartInvokerRenderData)),
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Qt::QueuedConnection);
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}
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~TRendererStartInvoker() {}
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static TRendererStartInvoker *instance() {
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static TRendererStartInvoker theInstance;
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return &theInstance;
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}
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void emitStartRender(TRendererImp *renderer, StartInvokerRenderData rd);
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Q_SIGNALS:
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void startRender(TRendererImp *, StartInvokerRenderData);
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public Q_SLOTS:
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void doStartRender(TRendererImp *, StartInvokerRenderData rd);
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};
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#endif // TRENDERERP_INCLUDE
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