111 lines
2.8 KiB
C++
111 lines
2.8 KiB
C++
#pragma once
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#ifndef TFUNCTORINVOKER_H
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#define TFUNCTORINVOKER_H
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// TnzCore includes
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#include "tcommon.h"
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// Qt includes
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#include <QObject>
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#undef DVAPI
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#undef DVVAR
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#ifdef TNZCORE_EXPORTS
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#define DVAPI DV_EXPORT_API
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#define DVVAR DV_EXPORT_VAR
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#else
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#define DVAPI DV_IMPORT_API
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#define DVVAR DV_IMPORT_VAR
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#endif
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//********************************************************************************
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// TFunctorInvoker declaration
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//********************************************************************************
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/*!
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\brief The TFunctorInvoker is a singleton class that can be used to invoke
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functions
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as Qt slots without having to inherit from QObject.
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\details \par Rationale
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Signal and slots are an important part of the Qt framework -
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however, using them
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requires to explicitly inherit from QObject. This singleton object
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is provided
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to avoid the memory overhead of inheriting from QObject in the
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case of simple
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function calls - notably functions that need to synchronize with
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Qt's main event
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loop.
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\par Usage
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Inherit from TFunctorInvoker::BaseFunctor and allocate a new
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instance on the heap,
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to be supplied to the TFunctorInvoker::invoke() slot.
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\n
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The following code exemplifies a correct usage for this class:
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\n
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\code
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class MyFunctor final : public TFunctorInvoker::BaseFunctor
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{
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MyParams m_params; // Function
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parameters
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public:
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MyFunctor(const MyParams& params) : m_params(params) {}
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void operator()()
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{
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// The function body, operating on m_params
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}
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};
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//------------------------------------------------------------------
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void invokeMyFunctor_queued(const MyParams& params)
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{
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QMetaObject::invokeMethod(TFunctorInvoker::instance(), "invoke",
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Qt::QueuedConnection,
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Q_ARG(void*, new MyFunctor(params))
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);
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}
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\endcode
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*/
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class DVAPI TFunctorInvoker final : public QObject {
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Q_OBJECT
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public:
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/*!
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\brief Polymorphic base \a zerary functor for TFunctorInvoker-compatible
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functors.
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*/
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class BaseFunctor {
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public:
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virtual ~BaseFunctor() {}
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virtual void operator()() = 0;
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};
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public:
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static TFunctorInvoker *instance();
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void invokeQueued(BaseFunctor *functor);
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public Q_SLOTS:
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void invoke(void *vPtr) {
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BaseFunctor *func = (BaseFunctor *)vPtr;
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(*func)(); // Invoke functor ...
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delete func; // ... and then delete it
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}
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private:
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TFunctorInvoker() {}
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};
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#endif // TFUNCTORINVOKER_H
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