@atlaskit/editor-common
Version:
A package that contains common classes and components for editor and renderer
86 lines • 3.64 kB
JavaScript
import _defineProperty from "@babel/runtime/helpers/defineProperty";
import { expValEquals } from '@atlaskit/tmp-editor-statsig/exp-val-equals';
export let ShadowKeys = /*#__PURE__*/function (ShadowKeys) {
ShadowKeys["SHOW_LEFT_SHADOW"] = "showLeftShadow";
ShadowKeys["SHOW_RIGHT_SHADOW"] = "showRightShadow";
return ShadowKeys;
}({});
export const shadowObserverClassNames = {
SENTINEL_LEFT: 'sentinel-left',
SENTINEL_RIGHT: 'sentinel-right',
SHADOW_CONTAINER: 'with-shadow-observer'
};
const requestIdleCallback = fn => {
// Ignored via go/ees005
// eslint-disable-next-line @typescript-eslint/no-explicit-any
return window.requestIdleCallback ?
// Ignored via go/ees005
// eslint-disable-next-line @typescript-eslint/no-explicit-any
window.requestIdleCallback(fn) : window.requestAnimationFrame(fn);
};
const cancelIdleCallback = id => {
// Ignored via go/ees005
// eslint-disable-next-line @typescript-eslint/no-explicit-any
return window.cancelIdleCallback ?
// Ignored via go/ees005
// eslint-disable-next-line @typescript-eslint/no-explicit-any
window.cancelIdleCallback(id) : window.cancelAnimationFrame(id);
};
export class ShadowObserver {
constructor({
scrollContainer,
onUpdateShadows
}) {
_defineProperty(this, "sentinels", {});
_defineProperty(this, "shadowStates", {
[ShadowKeys.SHOW_LEFT_SHADOW]: false,
[ShadowKeys.SHOW_RIGHT_SHADOW]: false
});
_defineProperty(this, "init", () => {
if (!this.scrollContainer || this.intersectionObserver) {
return;
}
this.sentinels.right = document.createElement('div');
this.sentinels.right.classList.add(shadowObserverClassNames.SENTINEL_RIGHT);
this.scrollContainer.appendChild(this.sentinels.right);
this.sentinels.left = document.createElement('div');
this.sentinels.left.classList.add(shadowObserverClassNames.SENTINEL_LEFT);
this.scrollContainer.prepend(this.sentinels.left);
this.intersectionObserver = new IntersectionObserver((entries, _) => {
entries.forEach(this.onIntersect);
}, {
root: this.scrollContainer,
rootMargin: '1px'
});
this.intersectionObserver.observe(this.sentinels.left);
this.intersectionObserver.observe(this.sentinels.right);
});
_defineProperty(this, "onIntersect", entry => {
this.requestCallbackId = requestIdleCallback(() => {
if (entry.target.classList.contains(shadowObserverClassNames.SENTINEL_LEFT)) {
this.shadowStates[ShadowKeys.SHOW_LEFT_SHADOW] = !entry.isIntersecting;
}
if (entry.target.classList.contains(shadowObserverClassNames.SENTINEL_RIGHT)) {
this.shadowStates[ShadowKeys.SHOW_RIGHT_SHADOW] = !entry.isIntersecting;
}
this.onUpdateShadows(this.shadowStates);
});
});
this.scrollContainer = scrollContainer;
this.onUpdateShadows = onUpdateShadows;
this.init();
}
dispose() {
if (this.intersectionObserver) {
this.intersectionObserver.disconnect();
this.intersectionObserver = undefined;
this.requestCallbackId && cancelIdleCallback(this.requestCallbackId);
}
if (expValEquals('platform_editor_renderer_shadow_observer_cleanup', 'isEnabled', true)) {
var _this$sentinels$left, _this$sentinels$right;
(_this$sentinels$left = this.sentinels.left) === null || _this$sentinels$left === void 0 ? void 0 : _this$sentinels$left.remove();
(_this$sentinels$right = this.sentinels.right) === null || _this$sentinels$right === void 0 ? void 0 : _this$sentinels$right.remove();
this.sentinels = {};
}
}
}