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Viewing file:     utils.js (7.43 KB)      -rw-r--r--

// @flow

import { type ElementRef } from 'react';
import type {
  ClassNamesState,
  CommonProps,
  InputActionMeta,
  OptionsType,
  ValueType,
} from './types';

// ==============================
// NO OP
// ==============================

export const noop = () => {};
export const emptyString = () => '';

// ==============================
// Class Name Prefixer
// ==============================

/**
 String representation of component state for styling with class names.

 Expects an array of strings OR a string/object pair:
 - className(['comp', 'comp-arg', 'comp-arg-2'])
   @returns 'react-select__comp react-select__comp-arg react-select__comp-arg-2'
 - className('comp', { some: true, state: false })
   @returns 'react-select__comp react-select__comp--some'
*/
function applyPrefixToName(prefix, name) {
  if (!name) {
    return prefix;
  } else if (name[0] === '-') {
    return prefix + name;
  } else {
    return prefix + '__' + name;
  }
}

export function classNames(
  prefix?: string | null,
  state?: ClassNamesState,
  className?: string
) {
  const arr = [className];
  if (state && prefix) {
    for (let key in state) {
      if (state.hasOwnProperty(key) && state[key]) {
        arr.push(`${applyPrefixToName(prefix, key)}`);
      }
    }
  }

  return arr
    .filter(i => i)
    .map(i => String(i).trim())
    .join(' ');
}
// ==============================
// Clean Value
// ==============================

export const cleanValue = (value: ValueType): OptionsType => {
  if (Array.isArray(value)) return value.filter(Boolean);
  if (typeof value === 'object' && value !== null) return [value];
  return [];
};

// ==============================
// Clean Common Props
// ==============================

export const cleanCommonProps = (props: CommonProps): any => {
  //className
  const {
    className, // not listed in commonProps documentation, needs to be removed to allow Emotion to generate classNames
    clearValue,
    cx,
    getStyles,
    getValue,
    hasValue,
    isMulti,
    isRtl,
    options, // not listed in commonProps documentation
    selectOption,
    selectProps,
    setValue,
    theme, // not listed in commonProps documentation
    ...innerProps
  } = props;
  return { ...innerProps };
};

// ==============================
// Handle Input Change
// ==============================

export function handleInputChange(
  inputValue: string,
  actionMeta: InputActionMeta,
  onInputChange?: (string, InputActionMeta) => string | void
) {
  if (onInputChange) {
    const newValue = onInputChange(inputValue, actionMeta);
    if (typeof newValue === 'string') return newValue;
  }
  return inputValue;
}

// ==============================
// Scroll Helpers
// ==============================

export function isDocumentElement(el: Element) {
  return [document.documentElement, document.body, window].indexOf(el) > -1;
}

// Normalized Scroll Top
// ------------------------------

export function normalizedHeight(el: Element): number {
  if (isDocumentElement(el)) {
    return window.innerHeight;
  }

  return el.clientHeight;
}

// Normalized scrollTo & scrollTop
// ------------------------------

export function getScrollTop(el: Element): number {
  if (isDocumentElement(el)) {
    return window.pageYOffset;
  }
  return el.scrollTop;
}

export function scrollTo(el: Element, top: number): void {
  // with a scroll distance, we perform scroll on the element
  if (isDocumentElement(el)) {
    window.scrollTo(0, top);
    return;
  }

  el.scrollTop = top;
}

// Get Scroll Parent
// ------------------------------

export function getScrollParent(element: ElementRef<*>): Element {
  let style = getComputedStyle(element);
  const excludeStaticParent = style.position === 'absolute';
  const overflowRx = /(auto|scroll)/;
  const docEl = ((document.documentElement: any): Element); // suck it, flow...

  if (style.position === 'fixed') return docEl;

  for (let parent = element; (parent = parent.parentElement); ) {
    style = getComputedStyle(parent);
    if (excludeStaticParent && style.position === 'static') {
      continue;
    }
    if (overflowRx.test(style.overflow + style.overflowY + style.overflowX)) {
      return parent;
    }
  }

  return docEl;
}

// Animated Scroll To
// ------------------------------

/**
  @param t: time (elapsed)
  @param b: initial value
  @param c: amount of change
  @param d: duration
*/
function easeOutCubic(t: number, b: number, c: number, d: number): number {
  return c * ((t = t / d - 1) * t * t + 1) + b;
}

export function animatedScrollTo(
  element: Element,
  to: number,
  duration: number = 200,
  callback: Element => void = noop
) {
  const start = getScrollTop(element);
  const change = to - start;
  const increment = 10;
  let currentTime = 0;

  function animateScroll() {
    currentTime += increment;
    const val = easeOutCubic(currentTime, start, change, duration);
    scrollTo(element, val);
    if (currentTime < duration) {
      window.requestAnimationFrame(animateScroll);
    } else {
      callback(element);
    }
  }
  animateScroll();
}

// Scroll Into View
// ------------------------------

export function scrollIntoView(
  menuEl: HTMLElement,
  focusedEl: HTMLElement
): void {
  const menuRect = menuEl.getBoundingClientRect();
  const focusedRect = focusedEl.getBoundingClientRect();
  const overScroll = focusedEl.offsetHeight / 3;

  if (focusedRect.bottom + overScroll > menuRect.bottom) {
    scrollTo(
      menuEl,
      Math.min(
        focusedEl.offsetTop +
          focusedEl.clientHeight -
          menuEl.offsetHeight +
          overScroll,
        menuEl.scrollHeight
      )
    );
  } else if (focusedRect.top - overScroll < menuRect.top) {
    scrollTo(menuEl, Math.max(focusedEl.offsetTop - overScroll, 0));
  }
}

// ==============================
// Get bounding client object
// ==============================

// cannot get keys using array notation with DOMRect
export function getBoundingClientObj(element: HTMLElement) {
  const rect = element.getBoundingClientRect();
  return {
    bottom: rect.bottom,
    height: rect.height,
    left: rect.left,
    right: rect.right,
    top: rect.top,
    width: rect.width,
  };
}
export type RectType = {
  left: number,
  right: number,
  bottom: number,
  height: number,
  width: number,
};

// ==============================
// String to Key (kebabify)
// ==============================

export function toKey(str: string): string {
  return str.replace(/\W/g, '-');
}

// ==============================
// Touch Capability Detector
// ==============================

export function isTouchCapable() {
  try {
    document.createEvent('TouchEvent');
    return true;
  } catch (e) {
    return false;
  }
}

// ==============================
// Mobile Device Detector
// ==============================

export function isMobileDevice() {
  try {
    return /Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test(
      navigator.userAgent
    );
  } catch (e) {
    return false;
  }
}

// ==============================
// Passive Event Detector
// ==============================

// https://github.com/rafgraph/detect-it/blob/main/src/index.ts#L19-L36
let passiveOptionAccessed = false;
const options = {
  get passive() {
    return (passiveOptionAccessed = true);
  },
};
// check for SSR
const w = typeof window !== 'undefined' ? window : {};
if (w.addEventListener && w.removeEventListener) {
  w.addEventListener('p', noop, options);
  w.removeEventListener('p', noop, false);
}

export const supportsPassiveEvents: boolean = passiveOptionAccessed;