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// SimpleObserver.hh
// Copyright (c) 2008 Fluxbox Team (fluxgen at fluxbox dot org)
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
#include "Observer.hh"
#include "SimpleCommand.hh"
namespace FbTk {
/** Functor for observers, instead of using this directly use makeObserver.
* Usage:
* @code
* class SomeClass {
* public:
* void doAction();
* };
*
* SomeClass some;
*
* Observer* obs = makeProxyObserver(some, &SomeClass::doAction);
* SomeSubject subj;
* subj.attach(obs);
* @endcode
*/
template <typename Receiver>
class SimpleObserver: public Observer {
public:
typedef void (Receiver::* Action)();
SimpleObserver(Receiver &r, Action a):
m_receiver(r), m_action(a) {
}
void update(Subject *changedSubj) {
(m_receiver.*m_action)();
}
private:
Receiver &m_receiver;
Action m_action;
};
// Helpers
/** Creates an observer that takes no arguments.
* @param receiver The receiving instance.
* @param action A function in the receiving class.
* @return allocated simple observer. @see SimpleObserver
*/
template <typename Receiver, typename Action>
Observer *makeObserver(Receiver &receiver, Action action) {
return new SimpleObserver<Receiver>( receiver, action );
}
}
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