forked from 0ad/0ad
Ykkrosh
397a350e45
Territories: Fixed memory leaks. Atlas: New section-toolbar. Fixed colour of brush grid. Moved open/save into File menu. Added 3D-ish lighting control. Added 'busy' notifications. This was SVN commit r4079.
62 lines
1.3 KiB
C++
62 lines
1.3 KiB
C++
#ifndef OBSERVABLE_H__
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#define OBSERVABLE_H__
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#include <boost/signals.hpp>
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#include <boost/bind.hpp>
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typedef boost::signals::connection ObservableConnection;
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template <typename T> class Observable : public T
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{
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public:
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template<typename C> ObservableConnection RegisterObserver(int order, void (C::*callback) (const T&), C* obj)
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{
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return m_Signal.connect(order, boost::bind(std::mem_fun(callback), obj, _1));
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}
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ObservableConnection RegisterObserver(int order, void (*callback) (const T&))
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{
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return m_Signal.connect(order, callback);
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}
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void RemoveObserver(const ObservableConnection& conn)
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{
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conn.disconnect();
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}
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void NotifyObservers()
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{
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m_Signal(*this);
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}
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// Use when an object is changing something that it's also observing,
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// because it already knows about the change and doesn't need to be notified
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// again (particularly since that may cause infinite loops).
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void NotifyObserversExcept(ObservableConnection& conn)
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{
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if (conn.blocked())
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{
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// conn is already blocked and won't see anything
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NotifyObservers();
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}
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else
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{
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// Temporarily disable conn
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conn.block();
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NotifyObservers();
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conn.unblock();
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}
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}
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Observable<T>* operator=(const T& rhs)
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{
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*dynamic_cast<T*>(this) = rhs;
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return this;
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}
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private:
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boost::signal<void (const T&)> m_Signal;
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};
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#endif // OBSERVABLE_H__
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