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◆ main openmsx / src / input / MSXEventDistributor.cc
1.3 KiB · C++ · last changed chore(): initial commit 1 month ago source blame history raw
e8555c89 Andy McCall 1 
#include "MSXEventDistributor.hh"
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#include "MSXEventListener.hh"
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#include "stl.hh"
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#include <cassert>
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namespace openmsx {
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MSXEventDistributor::~MSXEventDistributor()
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{
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	assert(listeners.empty());
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}
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bool MSXEventDistributor::isRegistered(MSXEventListener* listener) const
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{
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	return contains(listeners, listener);
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}
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void MSXEventDistributor::registerEventListener(MSXEventListener& listener)
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{
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	assert(!isRegistered(&listener));
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	listeners.push_back(&listener);
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}
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void MSXEventDistributor::unregisterEventListener(MSXEventListener& listener)
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{
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	move_pop_back(listeners, rfind_unguarded(listeners, &listener));
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}
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void MSXEventDistributor::distributeEvent(const Event& event, EmuTime time)
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{
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	// Iterate over a copy because signalMSXEvent() may indirect call back into
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	// registerEventListener().
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	//   e.g. signalMSXEvent() -> .. -> PlugCmd::execute() -> .. ->
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	//        Connector::plug() -> .. -> Joystick::plugHelper() ->
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	//        registerEventListener()
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	// 'listenersCopy' could be a local variable. But making it a member
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	// variable allows to reuse the allocated vector-capacity.
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	listenersCopy = listeners;
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	for (auto& l : listenersCopy) {
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		if (isRegistered(l)) {
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			// it's possible the listener unregistered itself
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			// (but is still present in the copy)
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			l->signalMSXEvent(event, time);
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		}
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	}
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}
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} // namespace openmsx