mirror of
https://github.com/Tonejs/Tone.js
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93 lines
2.6 KiB
TypeScript
93 lines
2.6 KiB
TypeScript
// import "../type/Type";
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import { Timeline, TimelineEvent } from "./Timeline";
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export type BasicPlaybackState = "started" | "stopped";
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export type PlaybackState = BasicPlaybackState | "paused";
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export interface StateTimelineEvent extends TimelineEvent {
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state: PlaybackState;
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}
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/**
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* A Timeline State. Provides the methods: `setStateAtTime("state", time)` and `getValueAtTime(time)`
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* @param initial The initial state of the StateTimeline. Defaults to `undefined`
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*/
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export class StateTimeline<AdditionalOptions extends {} = {}> extends Timeline<StateTimelineEvent & AdditionalOptions> {
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/**
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* The initial state
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*/
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private _initial: PlaybackState;
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constructor(initial: PlaybackState = "stopped") {
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super();
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this._initial = initial;
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}
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/**
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* Returns the scheduled state scheduled before or at
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* the given time.
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* @param time The time to query.
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* @return The name of the state input in setStateAtTime.
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*/
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getValueAtTime(time: Seconds): PlaybackState {
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const event = this.get(time);
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if (event !== null) {
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return event.state;
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} else {
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return this._initial;
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}
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}
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/**
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* Add a state to the timeline.
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* @param state The name of the state to set.
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* @param time The time to query.
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* @param options Any additional options that are needed in the timeline.
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*/
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setStateAtTime(state: PlaybackState, time: Seconds, options?: AdditionalOptions): this {
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// all state changes need to be >= the previous state time
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// TODO throw error if time < the previous event time
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this.add(Object.assign({}, options, {
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state,
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time,
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}));
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return this;
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}
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/**
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* Return the event before the time with the given state
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* @param state The state to look for
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* @param time When to check before
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* @return The event with the given state before the time
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*/
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getLastState(state: PlaybackState, time: number): StateTimelineEvent & AdditionalOptions | undefined {
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// time = this.toSeconds(time);
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const index = this._search(time);
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for (let i = index; i >= 0; i--) {
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const event = this._timeline[i];
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if (event.state === state) {
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return event;
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}
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}
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}
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/**
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* Return the event after the time with the given state
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* @param state The state to look for
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* @param time When to check from
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* @return The event with the given state after the time
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*/
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getNextState(state: PlaybackState, time: number): StateTimelineEvent & AdditionalOptions | undefined {
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// time = this.toSeconds(time);
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const index = this._search(time);
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if (index !== -1) {
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for (let i = index; i < this._timeline.length; i++) {
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const event = this._timeline[i];
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if (event.state === state) {
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return event;
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}
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}
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}
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}
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}
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