80b10f7772
This class works in the same way as the SimpleCommand class. Use it with the makeObserver function. It calls the receiver's member function when the subject sends a signal.
70 lines
2.2 KiB
C++
70 lines
2.2 KiB
C++
// SimpleObserver.hh
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// Copyright (c) 2008 Fluxbox Team (fluxgen at fluxbox dot org)
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//
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the "Software"),
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// to deal in the Software without restriction, including without limitation
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// the rights to use, copy, modify, merge, publish, distribute, sublicense,
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// and/or sell copies of the Software, and to permit persons to whom the
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// Software is furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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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 AND NONINFRINGEMENT. IN NO EVENT SHALL
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// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// 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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#include "Observer.hh"
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#include "SimpleCommand.hh"
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namespace FbTk {
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/** Functor for observers, instead of using this directly use makeObserver.
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* Usage:
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* @code
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* class SomeClass {
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* public:
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* void doAction();
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* };
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*
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* SomeClass some;
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*
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* Observer* obs = makeProxyObserver(some, &SomeClass::doAction);
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* SomeSubject subj;
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* subj.attach(obs);
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* @endcode
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*/
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template <typename Receiver>
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class SimpleObserver: public Observer {
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public:
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typedef void (Receiver::* Action)();
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SimpleObserver(Receiver &r, Action a):
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m_receiver(r), m_action(a) {
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}
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void update(Subject *changedSubj) {
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(m_receiver.*m_action)();
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}
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private:
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Receiver &m_receiver;
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Action m_action;
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};
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// Helpers
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/** Creates an observer that takes no arguments.
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* @param receiver The receiving instance.
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* @param action A function in the receiving class.
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* @return allocated simple observer. @see SimpleObserver
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*/
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template <typename Receiver, typename Action>
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Observer *makeObserver(Receiver &receiver, Action action) {
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return new SimpleObserver<Receiver>( receiver, action );
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}
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}
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