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export type AnimationCallback = (timestamp: number) => void | boolean;
export type AnimationTarget = {
callback: AnimationCallback;
stopped: boolean;
};
export class AnimationFrameHandler {
private targets = new WeakMap<object, AnimationTarget>();
private rafIds = new WeakMap<object, number>();
register(key: object, callback: AnimationCallback) {
this.targets.set(key, { callback, stopped: true });
}
start(key: object) {
const target = this.targets.get(key);
if (!target) {
return;
}
if (this.rafIds.has(key)) {
return;
}
this.targets.set(key, { ...target, stopped: false });
this.scheduleFrame(key);
}
stop(key: object) {
const target = this.targets.get(key);
if (target && !target.stopped) {
this.targets.set(key, { ...target, stopped: true });
}
this.cancelFrame(key);
}
private constructFrame(key: object): FrameRequestCallback {
return (timestamp: number) => {
const target = this.targets.get(key);
if (!target) {
return;
}
const shouldAbort = this.onFrame(target, timestamp);
if (!target.stopped && !shouldAbort) {
this.scheduleFrame(key);
} else {
this.cancelFrame(key);
}
};
}
private scheduleFrame(key: object) {
const rafId = requestAnimationFrame(this.constructFrame(key));
this.rafIds.set(key, rafId);
}
private cancelFrame(key: object) {
if (this.rafIds.has(key)) {
const rafId = this.rafIds.get(key)!;
cancelAnimationFrame(rafId);
}
this.rafIds.delete(key);
}
private onFrame(target: AnimationTarget, timestamp: number): boolean {
const shouldAbort = target.callback(timestamp);
return shouldAbort ?? false;
}
}
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