mirror of
https://github.com/Tonejs/Tone.js
synced 2024-12-28 12:33:12 +00:00
f17249691d
now in the form Tone.Something instead of using `import { Something } from "tone"`. It makes the example runner on the docs page work much faster
73 lines
2.1 KiB
TypeScript
73 lines
2.1 KiB
TypeScript
import { version } from "../version";
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import { AnyAudioContext, hasAudioContext, theWindow } from "./context/AudioContext";
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import { Context } from "./context/Context";
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import { DummyContext } from "./context/DummyContext";
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import { BaseContext } from "./context/BaseContext";
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import { OfflineContext } from "./context/OfflineContext";
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import { isAudioContext, isOfflineAudioContext } from "./util/AdvancedTypeCheck";
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/**
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* This dummy context is used to avoid throwing immediate errors when importing in Node.js
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*/
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const dummyContext = new DummyContext();
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/**
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* The global audio context which is getable and assignable through
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* getContext and setContext
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*/
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let globalContext: BaseContext = dummyContext;
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/**
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* Returns the default system-wide [[Context]]
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* @category Core
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*/
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export function getContext(): BaseContext {
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if (globalContext === dummyContext && hasAudioContext) {
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setContext(new Context());
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}
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return globalContext;
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}
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/**
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* Set the default audio context
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* @category Core
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*/
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export function setContext(context: BaseContext | AnyAudioContext): void {
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if (isAudioContext(context)) {
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globalContext = new Context(context);
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} else if (isOfflineAudioContext(context)) {
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globalContext = new OfflineContext(context);
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} else {
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globalContext = context;
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}
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}
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/**
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* Most browsers will not play _any_ audio until a user
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* clicks something (like a play button). Invoke this method
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* on a click or keypress event handler to start the audio context.
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* More about the Autoplay policy
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* [here](https://developers.google.com/web/updates/2017/09/autoplay-policy-changes#webaudio)
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* @example
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* document.querySelector("button").addEventListener("click", async () => {
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* await Tone.start();
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* console.log("context started");
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* });
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* @category Core
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*/
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export function start(): Promise<void> {
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return globalContext.resume();
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}
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/**
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* Log Tone.js + version in the console.
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*/
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if (theWindow && !theWindow.TONE_SILENCE_LOGGING) {
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let prefix = "v";
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if (version === "dev") {
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prefix = "";
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}
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const printString = ` * Tone.js ${prefix}${version} * `;
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// eslint-disable-next-line no-console
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console.log(`%c${printString}`, "background: #000; color: #fff");
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}
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