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◆ main openmsx / src / input / StateChangeDistributor.cc
1.8 KiB · C++ · last changed chore(): initial commit 1 month ago source blame history raw
e8555c89 Andy McCall 1 
#include "StateChangeDistributor.hh"
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#include "StateChange.hh"
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#include "StateChangeListener.hh"
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#include "stl.hh"
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#include <cassert>
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namespace openmsx {
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StateChangeDistributor::~StateChangeDistributor()
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{
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	assert(listeners.empty());
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}
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bool StateChangeDistributor::isRegistered(StateChangeListener* listener) const
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{
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	return contains(listeners, listener);
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}
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void StateChangeDistributor::registerListener(StateChangeListener& 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 StateChangeDistributor::unregisterListener(StateChangeListener& 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 StateChangeDistributor::registerRecorder(ReverseManager& recorder_)
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{
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	assert(!recorder);
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	recorder = &recorder_;
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}
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void StateChangeDistributor::unregisterRecorder(ReverseManager& recorder_)
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{
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	(void)recorder_;
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	assert(recorder == &recorder_);
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	recorder = nullptr;
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}
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void StateChangeDistributor::distribute(const StateChange& event) const
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{
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	// Iterate over a copy because signalStateChange() may indirect call
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	// back into registerListener().
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	//   e.g. signalStateChange() -> .. -> PlugCmd::execute() -> .. ->
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	//        Connector::plug() -> .. -> Joystick::plugHelper() ->
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	//        registerListener()
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	auto copy = listeners;
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	for (auto& l : copy) {
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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->signalStateChange(event); // might throw
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		}
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	}
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}
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void StateChangeDistributor::stopReplay(EmuTime time)
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{
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	if (!isReplaying()) return;
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	if (recorder) recorder->stopReplay(time);
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	for (auto& l : listeners) {
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		l->stopReplay(time);
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	}
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}
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bool StateChangeDistributor::isReplaying() const
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{
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	if (recorder) {
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		return recorder->isReplaying();
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	}
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	return false;
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}
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} // namespace openmsx