verstak/build/dist/source/core/sensors/ScrollSensor.js

Verstak - Front-End Library

var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {
    var c = arguments.length, r = c < 3 ? target : desc === null ? desc = Object.getOwnPropertyDescriptor(target, key) : desc, d;
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var __metadata = (this && this.__metadata) || function (k, v) {
    if (typeof Reflect === "object" && typeof Reflect.metadata === "function") return Reflect.metadata(k, v);
};
import { options, Reentrance, transaction, LoggingLevel, Transaction } from "reactronic";
import { HtmlElementSensor } from "./HtmlElementSensor.js";
export class ScrollSensor extends HtmlElementSensor {
    constructor(element) {
        super(element);
        this.x = Infinity;
        this.y = Infinity;
    }
    listen(enabled = true) {
        const t = Transaction.current;
        Transaction.outside(() => {
            t.whenFinished(true).then(() => {
                const element = this.sourceElement;
                if (enabled) {
                    element.addEventListener("scroll", this.onScroll.bind(this), { capture: true, passive: true });
                }
                else {
                    element.removeEventListener("scroll", this.onScroll.bind(this), { capture: true });
                }
            }, e => { });
        });
    }
    reset() {
        this.doReset();
    }
    onScroll(e) {
        this.doScroll(e);
    }
    doScroll(e) {
        this.updateSensorData(e);
    }
    doReset() {
        this.preventDefault = false;
        this.stopPropagation = false;
        this.x = Infinity;
        this.y = Infinity;
    }
    updateSensorData(e) {
        this.preventDefault = false;
        this.stopPropagation = false;
        this.x = this.sourceElement.scrollLeft;
        this.y = this.sourceElement.scrollTop;
        this.revision++;
    }
}
__decorate([
    transaction,
    __metadata("design:type", Function),
    __metadata("design:paramtypes", []),
    __metadata("design:returntype", void 0)
], ScrollSensor.prototype, "reset", null);
__decorate([
    transaction,
    options({ reentrance: Reentrance.cancelPrevious, logging: LoggingLevel.Off }),
    __metadata("design:type", Function),
    __metadata("design:paramtypes", [Event]),
    __metadata("design:returntype", void 0)
], ScrollSensor.prototype, "doScroll", null);