@visactor/vgrammar-core/es/interactions/view-scroll.js

VGrammar is a visual grammar library

import { throttle } from "@visactor/vutils";

import { ViewNavigationBase } from "./view-navigation-base";

export class ViewScroll extends ViewNavigationBase {
    constructor(view, option) {
        super(view, Object.assign({}, ViewScroll.defaultOptions, option)), this.type = ViewScroll.type, 
        this.handleStartInner = e => {
            this.formatScrollEvent(e), !e || this.options.shouldStart && !this.options.shouldStart(e) || (this._isStarted = !0, 
            this._inited || this._initGrammars(), this.updateView("start", this.handleScrollStart(e, this._state, this.options), "scroll", e));
        }, this.handleEnd = e => {
            this._isStarted && (this.formatScrollEvent(e), !e || this.options.shouldEnd && !this.options.shouldEnd(e) || (this.updateView("end", this.handleScrollEnd(e, this._state, this.options), "scroll", e), 
            this._isStarted = !1));
        }, this.handleStart = throttle(this.handleStartInner, this.options.throttle);
    }
    getEvents() {
        return [ {
            type: this.options.trigger,
            handler: this.handleStart
        }, {
            type: this.options.endTrigger,
            handler: this.handleEnd
        } ];
    }
}

ViewScroll.type = "view-scroll", ViewScroll.defaultOptions = {
    realtime: !0,
    reversed: !1,
    trigger: "wheel",
    endTrigger: "pointerup",
    throttle: 100
};
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