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web: Reduce initial playing resources

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Previously, the Intersection Observer doesn't filter hidden animations when page just loaded.

Ensure that the only visible animations to be played. Hidden resources will be frozen in the initial load.
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Jinny You 2024-05-22 18:06:11 +09:00 • committed by Hermet Park
parent 7e721e8ba7
commit 9c5eafd74e
1 changed files with 24 additions and 17 deletions
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37
web/src/lottie-player.ts
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@ -151,20 +151,6 @@ const _wait = (timeToDelay: number) => {
return new Promise((resolve) => setTimeout(resolve, timeToDelay))
};
const _observerCallback = (entries: IntersectionObserverEntry[]) => {
const entry = entries[0];
const target = entry.target as LottiePlayer;
if (entry.isIntersecting) {
if (target.currentState === PlayerState.Frozen) {
target.play();
}
} else if (target.currentState === PlayerState.Playing) {
target.freeze();
target.dispatchEvent(new CustomEvent(PlayerEvent.Freeze));
}
}
const _downloadFile = (fileName: string, blob: Blob) => {
const link = document.createElement('a');
link.setAttribute('href', URL.createObjectURL(blob));
@ -276,6 +262,7 @@ export class LottiePlayer extends LitElement {
private _counter: number = 1;
private _timer?: ReturnType<typeof setInterval>;
private _observer?: IntersectionObserver;
private _observable: boolean = false;
private async _init(): Promise<void> {
if (!_module) {
@ -298,12 +285,27 @@ export class LottiePlayer extends LitElement {
}
}
private _observerCallback(entries: IntersectionObserverEntry[]) {
const entry = entries[0];
const target = entry.target as LottiePlayer;
target._observable = entry.isIntersecting;
if (entry.isIntersecting) {
if (target.currentState === PlayerState.Frozen) {
target.play();
}
} else if (target.currentState === PlayerState.Playing) {
target.freeze();
target.dispatchEvent(new CustomEvent(PlayerEvent.Freeze));
}
}
protected firstUpdated(_changedProperties: PropertyValueMap<any> | Map<PropertyKey, unknown>): void {
this._canvas = this.shadowRoot!.querySelector('#thorvg-canvas') as HTMLCanvasElement;
this._canvas.width = this._canvas.offsetWidth;
this._canvas.height = this._canvas.offsetHeight;
this._observer = new IntersectionObserver(_observerCallback);
this._observer = new IntersectionObserver(this._observerCallback);
this._observer.observe(this);
if (!this._TVG) {
@ -457,8 +459,13 @@ export class LottiePlayer extends LitElement {
return;
}
if (this._observable) {
this.currentState = PlayerState.Playing;
window.requestAnimationFrame(this._animLoop.bind(this));
return;
}
this.currentState = PlayerState.Frozen;
}
/**