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◆ main openmsx / src / input / MSXEventDistributor.hh
1.5 KiB · C++ · last changed chore(): initial commit 1 month ago source blame history raw
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#ifndef MSXEVENTDISTRIBUTOR_HH
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#define MSXEVENTDISTRIBUTOR_HH
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#include "EmuTime.hh"
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#include "Event.hh"
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#include <vector>
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namespace openmsx {
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class MSXEventListener;
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class MSXEventDistributor
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{
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public:
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	MSXEventDistributor() = default;
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	MSXEventDistributor(const MSXEventDistributor&) = delete;
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	MSXEventDistributor(MSXEventDistributor&&) = delete;
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	MSXEventDistributor& operator=(const MSXEventDistributor&) = delete;
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	MSXEventDistributor& operator=(MSXEventDistributor&&) = delete;
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	~MSXEventDistributor();
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	/**
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	 * Registers a given object to receive certain events.
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	 * @param listener Listener that will be notified when an event arrives.
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	 */
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	void registerEventListener(MSXEventListener& listener);
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	/**
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	 * Unregisters a previously registered event listener.
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	 * @param listener Listener to unregister.
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	 */
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	void unregisterEventListener(MSXEventListener& listener);
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	/** Deliver the event to all registered listeners
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	  * @param event The event
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	  * @param time Current time
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	  * Note: MSXEventListener's are allowed to throw exceptions, and this
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	  *       method doesn't catch them (in case of an exception it's
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	  *       undefined which listeners receive the event)
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	  */
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	void distributeEvent(const Event& event, EmuTime time);
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private:
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	[[nodiscard]] bool isRegistered(MSXEventListener* listener) const;
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private:
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	std::vector<MSXEventListener*> listeners; // unordered
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	std::vector<MSXEventListener*> listenersCopy; // see distributeEvent()
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};
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} // namespace openmsx
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#endif