112 lines
3.3 KiB
C++
112 lines
3.3 KiB
C++
#pragma once
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#ifdef __cplusplus
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#include <unordered_map>
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#include <list>
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#include <jsi/jsi.h>
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namespace jsi = facebook::jsi;
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namespace expo::EventEmitter {
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/**
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Class containing and managing listeners of the event emitter.
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*/
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class Listeners {
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private:
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friend class NativeState;
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friend void addListener(jsi::Runtime &runtime, const jsi::Object &emitter, const std::string &eventName, const jsi::Function &listener);
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friend void removeListener(jsi::Runtime &runtime, const jsi::Object &emitter, const std::string &eventName, const jsi::Function &listener);
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friend void removeAllListeners(jsi::Runtime &runtime, const jsi::Object &emitter, const std::string &eventName);
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friend void emitEvent(jsi::Runtime &runtime, const jsi::Object &emitter, const std::string &eventName, const jsi::Value *args, size_t count);
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friend size_t getListenerCount(jsi::Runtime &runtime, const jsi::Object &emitter, const std::string &eventName);
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/**
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Type of the list containing listeners for the specific event name.
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*/
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using ListenersList = std::list<jsi::Value>;
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/**
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Type of the map where the keys are event names and the values are lists of listeners.
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*/
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using ListenersMap = std::unordered_map<std::string, ListenersList>;
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/**
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Map with the events and listeners.
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*/
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ListenersMap listenersMap;
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/**
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Adds a listener for the given event name.
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*/
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void add(jsi::Runtime &runtime, const std::string& eventName, const jsi::Function &listener) noexcept;
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/**
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Removes the listener for the given event name.
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*/
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void remove(jsi::Runtime &runtime, const std::string& eventName, const jsi::Function &listener) noexcept;
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/**
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Removes all listeners for the given event name.
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*/
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void removeAll(const std::string& eventName) noexcept;
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/**
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Clears the entire map of events and listeners.
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*/
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void clear() noexcept;
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/**
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Returns a number of listeners added for the given event name.
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*/
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size_t listenersCount(const std::string& eventName) noexcept;
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/**
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Calls listeners for the given event name, with the given `this` object and payload arguments.
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*/
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void call(jsi::Runtime &runtime, const std::string& eventName, const jsi::Object &thisObject, const jsi::Value *args, size_t count) noexcept;
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};
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/**
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Class representing a native state of objects that emit events.
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*/
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class JSI_EXPORT NativeState : public jsi::NativeState {
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public:
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using Shared = std::shared_ptr<NativeState>;
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NativeState();
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~NativeState() override;
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/**
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A structure containing event listeners.
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*/
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Listeners listeners;
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/**
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Gets event emitter's native state from the given object.
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If `createIfMissing` is set to `true`, the state will be automatically created.
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*/
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static Shared get(jsi::Runtime &runtime, const jsi::Object &object, bool createIfMissing = false);
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};
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/**
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Emits an event with the given name and arguments to the emitter object.
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Does nothing if the given object is not an instance of the EventEmitter class.
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*/
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void emitEvent(jsi::Runtime &runtime, jsi::Object &emitter, const std::string &eventName, const std::vector<jsi::Value> &arguments);
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/**
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Gets `expo.EventEmitter` class from the given runtime.
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*/
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jsi::Function getClass(jsi::Runtime &runtime);
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/**
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Installs `expo.EventEmitter` class in the given runtime.
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*/
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void installClass(jsi::Runtime &runtime);
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} // namespace expo::EventEmitter
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#endif // __cplusplus
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