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