playcanvas/build/playcanvas/src/core/event-handler.js

Open-source WebGL/WebGPU 3D engine for the web

import { EventHandle } from "./event-handle.js";
class EventHandler {
	_callbacks = /* @__PURE__ */ new Map();
	_callbackActive = /* @__PURE__ */ new Map();
	initEventHandler() {
		this._callbacks = /* @__PURE__ */ new Map();
		this._callbackActive = /* @__PURE__ */ new Map();
	}
	_addCallback(name, callback, scope, once) {
		if (!this._callbacks.has(name)) {
			this._callbacks.set(name, []);
		}
		if (this._callbackActive.has(name)) {
			const callbackActive = this._callbackActive.get(name);
			if (callbackActive && callbackActive === this._callbacks.get(name)) {
				this._callbackActive.set(name, callbackActive.slice());
			}
		}
		const evt = new EventHandle(this, name, callback, scope, once);
		this._callbacks.get(name).push(evt);
		return evt;
	}
	on(name, callback, scope = this) {
		return this._addCallback(name, callback, scope, false);
	}
	once(name, callback, scope = this) {
		return this._addCallback(name, callback, scope, true);
	}
	off(name, callback, scope) {
		if (name) {
			if (this._callbackActive.has(name) && this._callbackActive.get(name) === this._callbacks.get(name)) {
				this._callbackActive.set(name, this._callbackActive.get(name).slice());
			}
		} else {
			for (const [key, callbacks] of this._callbackActive) {
				if (!this._callbacks.has(key)) {
					continue;
				}
				if (this._callbacks.get(key) !== callbacks) {
					continue;
				}
				this._callbackActive.set(key, callbacks.slice());
			}
		}
		if (!name) {
			for (const callbacks of this._callbacks.values()) {
				for (let i = 0; i < callbacks.length; i++) {
					callbacks[i].removed = true;
				}
			}
			this._callbacks.clear();
		} else if (!callback) {
			const callbacks = this._callbacks.get(name);
			if (callbacks) {
				for (let i = 0; i < callbacks.length; i++) {
					callbacks[i].removed = true;
				}
				this._callbacks.delete(name);
			}
		} else {
			const callbacks = this._callbacks.get(name);
			if (!callbacks) {
				return this;
			}
			for (let i = 0; i < callbacks.length; i++) {
				if (callbacks[i].callback !== callback) {
					continue;
				}
				if (scope && callbacks[i].scope !== scope) {
					continue;
				}
				callbacks[i].removed = true;
				callbacks.splice(i, 1);
				i--;
			}
			if (callbacks.length === 0) {
				this._callbacks.delete(name);
			}
		}
		return this;
	}
	offByHandle(handle) {
		const name = handle.name;
		handle.removed = true;
		if (this._callbackActive.has(name) && this._callbackActive.get(name) === this._callbacks.get(name)) {
			this._callbackActive.set(name, this._callbackActive.get(name).slice());
		}
		const callbacks = this._callbacks.get(name);
		if (!callbacks) {
			return this;
		}
		const ind = callbacks.indexOf(handle);
		if (ind !== -1) {
			callbacks.splice(ind, 1);
			if (callbacks.length === 0) {
				this._callbacks.delete(name);
			}
		}
		return this;
	}
	fire(name, arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8) {
		if (!name) {
			return this;
		}
		const callbacksInitial = this._callbacks.get(name);
		if (!callbacksInitial) {
			return this;
		}
		let callbacks;
		if (!this._callbackActive.has(name)) {
			this._callbackActive.set(name, callbacksInitial);
		} else if (this._callbackActive.get(name) !== callbacksInitial) {
			callbacks = callbacksInitial.slice();
		}
		for (let i = 0; (callbacks || this._callbackActive.get(name)) && i < (callbacks || this._callbackActive.get(name)).length; i++) {
			const evt = (callbacks || this._callbackActive.get(name))[i];
			if (!evt.callback) continue;
			evt.callback.call(evt.scope, arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8);
			if (evt._once) {
				const existingCallback = this._callbacks.get(name);
				const ind = existingCallback ? existingCallback.indexOf(evt) : -1;
				if (ind !== -1) {
					if (this._callbackActive.get(name) === existingCallback) {
						this._callbackActive.set(name, this._callbackActive.get(name).slice());
					}
					const callbacks2 = this._callbacks.get(name);
					if (!callbacks2) continue;
					callbacks2[ind].removed = true;
					callbacks2.splice(ind, 1);
					if (callbacks2.length === 0) {
						this._callbacks.delete(name);
					}
				}
			}
		}
		if (!callbacks) {
			this._callbackActive.delete(name);
		}
		return this;
	}
	hasEvent(name) {
		return !!this._callbacks.get(name)?.length;
	}
}
export {
	EventHandler
};