44 lines
2.0 KiB
JavaScript
44 lines
2.0 KiB
JavaScript
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import { AsyncAction } from './AsyncAction';
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import { AnimationFrame } from '../util/AnimationFrame';
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/**
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* We need this JSDoc comment for affecting ESDoc.
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* @ignore
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* @extends {Ignored}
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*/
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export class AnimationFrameAction extends AsyncAction {
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constructor(scheduler, work) {
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super(scheduler, work);
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this.scheduler = scheduler;
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this.work = work;
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}
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requestAsyncId(scheduler, id, delay = 0) {
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// If delay is greater than 0, request as an async action.
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if (delay !== null && delay > 0) {
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return super.requestAsyncId(scheduler, id, delay);
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}
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// Push the action to the end of the scheduler queue.
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scheduler.actions.push(this);
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// If an animation frame has already been requested, don't request another
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// one. If an animation frame hasn't been requested yet, request one. Return
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// the current animation frame request id.
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return scheduler.scheduled || (scheduler.scheduled = AnimationFrame.requestAnimationFrame(scheduler.flush.bind(scheduler, null)));
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}
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recycleAsyncId(scheduler, id, delay = 0) {
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// If delay exists and is greater than 0, or if the delay is null (the
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// action wasn't rescheduled) but was originally scheduled as an async
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// action, then recycle as an async action.
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if ((delay !== null && delay > 0) || (delay === null && this.delay > 0)) {
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return super.recycleAsyncId(scheduler, id, delay);
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}
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// If the scheduler queue is empty, cancel the requested animation frame and
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// set the scheduled flag to undefined so the next AnimationFrameAction will
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// request its own.
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if (scheduler.actions.length === 0) {
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AnimationFrame.cancelAnimationFrame(id);
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scheduler.scheduled = undefined;
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}
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// Return undefined so the action knows to request a new async id if it's rescheduled.
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return undefined;
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}
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}
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//# sourceMappingURL=AnimationFrameAction.js.map
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