mirror of https://github.com/polybar/polybar.git
108 lines
2.8 KiB
C++
108 lines
2.8 KiB
C++
#pragma once
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#include "common.hpp"
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#include "components/logger.hpp"
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#include "events/signal_receiver.hpp"
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POLYBAR_NS
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/**
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* @brief Holds all signal receivers attached to the emitter
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*/
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extern signal_receivers_t g_signal_receivers;
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/**
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* Wrapper used to delegate emitted signals
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* to attached signal receivers
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*/
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class signal_emitter {
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public:
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using make_type = signal_emitter&;
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static make_type make();
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explicit signal_emitter() = default;
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virtual ~signal_emitter() {}
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template <typename Signal>
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bool emit(const Signal& sig) {
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try {
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if (g_signal_receivers.find(id<Signal>()) != g_signal_receivers.end()) {
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for (auto&& item : g_signal_receivers.at(id<Signal>())) {
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if (item.second->on(sig)) {
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return true;
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}
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}
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}
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} catch (const std::exception& e) {
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logger::make().err("Signal receiver raised an exception: %s", e.what());
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}
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return false;
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}
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template <typename Signal, typename Next, typename... Signals>
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bool emit(const Signal& sig) const {
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return emit<Signal>(sig) || emit<Next, Signals...>(sig);
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}
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template <int Priority, typename Signal, typename... Signals>
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void attach(signal_receiver<Priority, Signal, Signals...>* s) {
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attach<signal_receiver<Priority, Signal, Signals...>, Signal, Signals...>(s);
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}
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template <int Priority, typename Signal, typename... Signals>
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void detach(signal_receiver<Priority, Signal, Signals...>* s) {
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detach<signal_receiver<Priority, Signal, Signals...>, Signal, Signals...>(s);
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}
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protected:
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template <typename Signal>
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std::type_index id() const {
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return typeid(Signal);
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}
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template <typename Receiver, typename Signal>
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void attach(Receiver* s) {
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attach(s, id<Signal>());
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}
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template <typename Receiver, typename Signal, typename Next, typename... Signals>
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void attach(Receiver* s) {
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attach(s, id<Signal>());
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attach<Receiver, Next, Signals...>(s);
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}
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void attach(signal_receiver_interface* s, std::type_index id) {
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g_signal_receivers[id].emplace(s->priority(), s);
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}
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template <typename Receiver, typename Signal>
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void detach(Receiver* s) {
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detach(s, id<Signal>());
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}
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template <typename Receiver, typename Signal, typename Next, typename... Signals>
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void detach(Receiver* s) {
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detach(s, id<Signal>());
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detach<Receiver, Next, Signals...>(s);
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}
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void detach(signal_receiver_interface* d, std::type_index id) {
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try {
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auto& prio_map = g_signal_receivers.at(id);
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const auto& prio_sink_pair = prio_map.equal_range(d->priority());
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for (auto it = prio_sink_pair.first; it != prio_sink_pair.second;) {
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if (d == it->second) {
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it = prio_map.erase(it);
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} else {
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++it;
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}
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}
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} catch (...) {
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}
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}
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};
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POLYBAR_NS_END
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