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146 lines
3.7 KiB
C++
146 lines
3.7 KiB
C++
//
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// Delegate.h
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//
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// $Id: //poco/Main/WebWidgets/include/Poco/WebWidgets/Delegate.h#2 $
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//
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// Library: WebWidgets
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// Package: Core
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// Module: Delegate
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//
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// Definition of the Delegate class.
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//
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// Copyright (c) 2008, Applied Informatics Software Engineering GmbH.
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// and Contributors.
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//
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// Permission is hereby granted, free of charge, to any person or organization
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// obtaining a copy of the software and accompanying documentation covered by
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// this license (the "Software") to use, reproduce, display, distribute,
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// execute, and transmit the Software, and to prepare derivative works of the
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// Software, and to permit third-parties to whom the Software is furnished to
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// do so, all subject to the following:
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//
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// The copyright notices in the Software and this entire statement, including
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// the above license grant, this restriction and the following disclaimer,
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// must be included in all copies of the Software, in whole or in part, and
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// all derivative works of the Software, unless such copies or derivative
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// works are solely in the form of machine-executable object code generated by
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// a source language processor.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
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// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
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// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
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// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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//
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#ifndef WebWidgets_Delegate_INCLUDED
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#define WebWidgets_Delegate_INCLUDED
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#include "Poco/WebWidgets/WebWidgets.h"
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#include "Poco/RefCountedObject.h"
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namespace Poco {
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namespace WebWidgets {
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class BasicDelegateImpl;
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class WebWidgets_API Delegate
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/// Delegate implements a very simple, lightweight delegate mechanism.
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{
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public:
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Delegate();
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/// Creates a Delegate for void.
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Delegate(const Delegate& delegate);
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/// Creates a Delegate by copying another one.
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Delegate(BasicDelegateImpl* pImpl);
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/// Creates a Delegate using the given BasicDelegateImpl.
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~Delegate();
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/// Destroys the Delegate.
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void swap(Delegate& delegate);
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/// Swaps the Delegate with another one.
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Delegate& operator = (const Delegate& delegate);
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/// Assignment operator.
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void operator () (void* pSender) const;
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/// Invokes the delegate.
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operator void* () const;
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bool operator ! () const;
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private:
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BasicDelegateImpl* _pImpl;
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};
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class WebWidgets_API BasicDelegateImpl: public Poco::RefCountedObject
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/// The common base class for all DelegateImpl instantiations.
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{
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public:
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BasicDelegateImpl();
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/// Creates the BasicDelegateImpl.
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virtual void invoke(void* pSender) = 0;
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/// Invokes the delegate.
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protected:
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~BasicDelegateImpl();
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/// Destroys the Delegate.
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};
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template <class C>
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class DelegateImpl: public BasicDelegateImpl
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{
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public:
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typedef void (C::*Callback)(void*);
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DelegateImpl(C& object, Callback method):
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/// Creates the DelegateImpl
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_pObject(&object),
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_method(method)
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{
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}
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void invoke(void* pSender)
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{
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(_pObject->*_method)(pSender);
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}
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protected:
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~DelegateImpl()
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{
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}
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private:
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DelegateImpl();
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C* _pObject;
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Callback _method;
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};
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template <class C>
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Delegate delegate(C& object, void (C::*method)(void*))
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/// "Constructor" function for a Delegate.
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{
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return Delegate(new DelegateImpl<C>(object, method));
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}
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} } // namespace Poco::WebWidgets
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#endif // WebWidgets_Delegate_INCLUDED
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