vscroll/dist/esm2015/classes/settings.js

Virtual scroll engine

import { SETTINGS, DEV_SETTINGS, validate, validateOne, VALIDATORS } from '../inputs/index';
export class Settings {
  constructor(settings, devSettings, instanceIndex) {
    this.parseInput(settings, SETTINGS);
    this.parseInput(devSettings, DEV_SETTINGS);
    this.instanceIndex = instanceIndex;
    this.initializeDelay = this.getInitializeDelay();
    this.viewport = this.getViewport();
    // todo: min/max indexes must be ignored if infinite mode is enabled ??
  }
  parseInput(input, props) {
    const result = validate(input, props);
    if (!result.isValid) {
      throw new Error('Invalid settings');
    }
    Object.entries(result.params).forEach(([key, par]) => Object.assign(this, { [key]: par.value }));
  }
  getInitializeDelay() {
    let result = 0;
    if (this.windowViewport && this.initWindowDelay && !('scrollRestoration' in history)) {
      result = this.initWindowDelay;
    }
    if (this.initDelay > 0) {
      result = Math.max(result, this.initDelay);
    }
    return result;
  }
  getViewport() {
    if (typeof this.viewportElement !== 'function') {
      return this.viewportElement;
    }
    const value = this.viewportElement();
    const result = validateOne({ value }, 'value', { validators: [VALIDATORS.ELEMENT] });
    if (!result.isValid) {
      return null; // fallback to default (null) if Function didn't return HTML element synchronously
    }
    return result.value;
  }
}
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