94 lines
2.8 KiB
TypeScript
94 lines
2.8 KiB
TypeScript
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module TK {
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/**
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* Client for Toggle object, allowing to manipulate it
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*
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* *state* may be:
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* - a boolean to require on or off
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* - a number to require on for the duration in milliseconds
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* - undefined to switch between on and off (based on the client state, not the toggle state)
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*
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* The function returns the actual state after applying the requirement
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*/
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export type ToggleClient = (state?: boolean | number) => boolean
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/**
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* A toggle between two states (on and off).
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*
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* A toggle will be on if at least one ToggleClient requires it to be on.
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*/
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export class Toggle {
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private on: Function
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private off: Function
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private status = false
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private clients: string[] = []
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private scheduled: { [client: string]: any } = {}
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private timer = Timer.global
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constructor(on: Function = () => null, off: Function = () => null) {
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this.on = on;
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this.off = off;
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}
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/**
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* Check if the current state is on
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*/
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isOn(): boolean {
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return this.status;
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}
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/**
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* Register a client to manipulate the toggle's state
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*/
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manipulate(client: string): ToggleClient {
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return state => {
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if (this.scheduled[client]) {
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this.timer.cancel(this.scheduled[client]);
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this.scheduled[client] = null;
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}
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if (typeof state == "undefined") {
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if (contains(this.clients, client)) {
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this.stop(client);
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} else {
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this.start(client);
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}
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} else if (typeof state == "number") {
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if (state > 0) {
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this.start(client);
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this.scheduled[client] = this.timer.schedule(state, () => this.stop(client));
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} else {
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this.stop(client);
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}
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} else if (!state) {
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this.stop(client);
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} else {
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this.start(client);
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}
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return this.status;
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}
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}
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/**
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* Start the toggle for a client (set the status *on*)
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*/
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private start(client: string) {
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add(this.clients, client);
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if (!this.status) {
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this.status = true;
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this.on();
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}
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}
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/**
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* Stop the toggle (set the status *off*)
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*/
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private stop(client: string) {
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remove(this.clients, client);
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if (this.status && this.clients.length == 0) {
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this.status = false;
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this.off();
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}
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}
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}
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}
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